Knowledge/FAQ

Knowledge

A hydraulic motor is a device that converts the pressure energy of a liquid into mechanical energy. In principle, a hydraulic pump can be used as a hydraulic motor, and a hydraulic motor can also be used as a hydraulic pump. But in fact, although the similar types of hydraulic pumps and hydraulic motors are similar in structure, due to the different working conditions of the two, there are some differences in the structure of the two.

    1. Hydraulic motors generally require forward and reverse rotation, while hydraulic pumps generally rotate in one direction, and there is no such requirement.

    2. In order to reduce the oil suction resistance and the radial force, the size of the oil suction port of the hydraulic pump is larger than that of the oil outlet.

    3. The structure of the hydraulic pump must ensure the first suction capacity, but the hydraulic motor does not have this requirement.

    4. Due to the above-mentioned different characteristics of hydraulic motors and hydraulic pumps, many types of hydraulic motors and hydraulic pumps cannot be used in reverse.

The jack is a commonly used tool in the machinery industry. This small tool is commonly used to lift heavy objects. The following uses it as an example to briefly describe the working principle of hydraulic transmission.

    The hydraulic jack has two hydraulic cylinders 1 and 6, each of which is equipped with a piston. The piston and the cylinder body maintain a good cooperation relationship. Not only the piston can slide in the cylinder, but also a reliable seal between the mating surfaces. When the lever is lifted up, the piston of hydraulic cylinder 1 moves upward, the volume of the lower cavity of hydraulic cylinder 1 increases to form a partial vacuum, the check valve 2 is closed, and the oil in the fuel tank 4 opens the check valve 3 through the suction pipe under the effect of atmospheric pressure. Enter the lower cavity of hydraulic cylinder 1 to complete a suction operation. When the lever is pressed down, the piston of hydraulic cylinder 1 moves down, the volume of the lower chamber of hydraulic cylinder 1 decreases, the oil is squeezed, the pressure rises, and the check valve 3 is closed. To the valve 2, the oil enters the lower cavity of the hydraulic cylinder 6 through the oil discharge pipe, and pushes the big piston to move the jack up. By constantly pulling the lever up and down in this way, the weight can be continuously raised to achieve the purpose of lifting. If the lever stops, the oil pressure in the lower cavity of the hydraulic cylinder 6 will close the one-way valve 2 and the piston of the hydraulic cylinder 6 will be locked together with the weight and stop at the lifting position. For example, if the shut-off valve 5 is opened, the lower chamber of the hydraulic cylinder 6 passes through the fuel tank, and the piston of the hydraulic cylinder 6 will move downward under its own weight and quickly return to the original position.

Many people are very interested in this issue. In fact, both of them belong to the takeover, they are a bridge between the equipment and the equipment. This is what they have in common, but their division of labor is different. This is the difference. In the hydraulic fitting  hydraulic system, the components connecting the high pressure oil pipe and the high pressure oil pipe are divided into many types, and the fitting  body is when the pipe fitting and the device are connected, the connection mode is not matched or the diameter is required to be changed. To complete, one end of the connector body is connected to the pipe fitting , and one end is connected to the device. The elbow is a pipe that changes the direction of the pipe. According to the angle, there are three most commonly used 45° and 90°180°, and other abnormal angle elbows such as 60° are also included according to engineering needs. The materials for the elbows are cast iron, stainless steel, alloy steel, malleable iron, carbon steel, non-ferrous metals and plastics. The way to connect with the pipe is: direct welding, flange connection, hot melt connection, electrofusion connection, screw connection and socket connection. According to the production process, it can be divided into: welding elbow, stamping elbow, push elbow, casting elbow, butt weld elbow, etc. This is probably the difference between the fitting body and the elbow in the hydraulic adapter fitting.

A complete, working hydraulic system should consist of the following five main components:

(1) Power component: A device that converts mechanical energy into fluid pressure energy. Common are hydraulic pumps that provide pressurized fluid to the system.

(2) Actuator: A device that converts the pressure energy of a fluid into a mechanical energy output. It can be a hydraulic cylinder for linear motion or a hydraulic motor or swing cylinder for rotary motion. (3) Control components: devices that control and regulate the pressure, flow, and flow direction of fluids in the system, as well as signal control components that perform functions such as signal conversion, logic operations, and amplification, such as the relief valve and flow in Figure a. Control valve and reversing valve.

(4) Auxiliary components: devices other than the above three required to ensure the normal operation of the system, such as the filter, fuel tank and pipe fittings in Figure a.

(5) Working medium: use it for energy and signal transmission. The hydraulic system uses hydraulic fluid as the working medium.

Hydraulic transmission utilizes changes in the volume of liquid within the sealed volume to transfer and control energy;

Hydraulic transmission uses the kinetic or potential energy of a non-closed liquid to transfer energy and control energy.

Because hydraulic transmission has many outstanding advantages, it is widely used in various engineering fields such as machinery manufacturing, engineering construction, and petrochemical industry.

Although the length of the adapter fitting can be used depends mainly on its own life span, since the life of the fitting  is also affected by many factors in the application, when using the fitting , the following can be done. To effectively extend the life of the fitting. First, ensure that the load does not exceed the rated pressure: the adapter fitting has a specific pressure value. Once the load exceeds the rated pressure, it will cause great damage to the equipment, which will inevitably lead to shortened fitting life. Therefore, in order to extend the service life of the fitting, it is necessary to ensure that the load does not exceed its rated pressure when using the fitting. Second, ensure that there is sufficient hydraulic oil quantity: running the adapter fitting in the state of insufficient oil will aggravate the loss of the joint-related structure during operation, which will inevitably lead to shortened life of the fitting. Therefore, in order to extend the service life of the fitting, it is necessary to ensure that the fitting has sufficient hydraulic oil. In short, as long as everyone in the process of using the adapter fitting, the fitting can be protected from many aspects, to avoid unnecessary damage to the fitting, and to minimize the natural loss of the fitting, it can effectively extend the service life of the fitting.

adapter fitting manufacturers know that many users are not very familiar with the price of different fittings when selecting fittings. Waterproof fittings, that is, equipment that plays a transitional role in the water supply equipment. Waterproof fittings need to have good sealing performance. Many brands of waterproof fittings are circulating on the market. How to choose suitable waterproof fittings according to requirements? Everyone, waterproof fittings are divided into internal thread connection, external thread connection, snap connection and other ways depending on the installation method. The function of the waterproof connector is usually waterproof and industrial plug. It does not cause damage to the motor, and it does not need to disassemble the fixed head during use. The cable can pass directly, saving time and convenience, and is generally used for fixing the cable of mechanical control box, power distribution box, electrical appliance, etc. Prices generally range from $20 to $50. For some industrial plugs, the transition joint manufacturers tell everyone that the price is not the same, because the industrial fittings have good corrosion resistance, high temperature resistance and anti-aging, usually used in railway, petrochemical, electric power, steel smelting and other large scales. The company uses nylon PA66 material for the outer shell, high-quality brass pins in the middle, and waterproof rubber mat. It can be used with industrial waterproof fittings to have good waterproof, splash-proof and anti-dust effects, but also resistant to fire and gas. High temperature, stable connection, output voltage is between 220V-380V, current is 16A, the price is 70 yuan, because of its good nature, so the use time is very long.

Nowadays, hydraulic fittings are basically used in equipments of various industries in China, and in recent years, its development has gradually been on the right track, ushered in a better development. Speaking of the hydraulic fitting has to say is its hydraulic system, it is because the existence of the hydraulic system determines that everyone has a great purchase, but this does not mean that there is no need for improvement. What are its advantages and disadvantages?

The structure is simple and the layout is flexible. Because the components of the hydraulic fitting itself are not large, the structure of the hydraulic system design is very simple in order to adapt to the use of the fitting. Although its structure is very simple, this does not mean that its performance is very weak. The small five is still full, and it is precisely because of this performance that everyone will not deviate from its choice. In addition, in order to facilitate your use in the future, its layout is also very flexible.

The concealment of the failure of the hydraulic system is the shortcoming that it needs to solve now. In fact, this cannot be said to be a disadvantage, because almost all mechanical equipment needs to be improved, and only in this way can the technology develop faster and better. It is precisely because of its fault concealment that everyone uses it when it finds that any problem must be solved in time to prevent it from causing greater losses.

Fluid drives are drives that use energy as a working medium for energy conversion, transfer, and control. It includes hydraulic transmission, hydraulic transmission and pneumatic transmission.

The transition fitting manufacturer believes that the type and structure of the selected parts should be based on the requirements of the parts, and on the basis of the types, characteristics and application ranges of the various parts. Analyze and calculate the load. Determine the load acting on the part based on the machine’s operation.

Transition fitting manufacturers believe that it is necessary to choose the right material when selecting mechanical parts. Choose the right material based on the part’s application requirements, process requirements and economic requirements. Determine the main dimensions and parameters of the part. The main dimensions and parameters of the part are determined based on the failure analysis of the part and the calculated calculation criteria. The structural design of the part. Reasonable shape and structural dimensions of the part should be determined according to functional requirements, process requirements, and standardization requirements.

The transition fitting manufacturer said the final check calculation. This check calculation is performed only for important parts and when necessary to determine the safety of the part when it is working. Draw a working diagram of the part. Write a design calculation specification. The mechanical part design is to study the design problems of general mechanical parts from the working principle, bearing capacity, construction and maintenance of the machine, including how to determine the shape and size of the parts reasonably, how to choose the materials of the parts reasonably and how to make the parts have good Craftsmanship, etc.

In hydraulic systems, whether it is a hydraulic adapter fiting, a metal pipe fitting, or a hose fitting, there is a problem that leakage is likely to occur. For the ferrule type pipe fitting, most of the pipe is subjected to a large external force or impact force, causing the ferrule to loosen or the pipe end face to be deformed to cause leakage. For fittings such as hydraulic adapter fittings, leakage may exist. In this case, check whether the ferrule is out of round, whether the cutting edge is defective, whether the end of the tube is intact, and the degree of compression of the ferrule nut. Eliminate the external force of the pipeline. For the flared pipe fittings, most of them are caused by excessive flare, quality is not required or disassembled many times, causing leakage due to flaring deformation or cracking. At this time, the front end can be cut off and re-expanded. If the male and female cones are used for sealing, the leakage is mostly due to the damage of the two tapered surfaces, and the tapered surface can be ground with abrasive sand. Hydraulic fittings such as fittings are likely to leak because the “о” ring is not compacted and the amount of elastic deformation is insufficient to cause leakage; the “о” ring is too deep to cause leakage. In this regard, it is necessary to re-select the “о” ring with the same outer diameter and thick section, or cut or grind the sealing plane with the groove to reduce the depth of the groove, so that “о” The ring has sufficient elastic deformation. For the leakage of pipe fittings with oil-resistant rubber sheets, wool felts, mild steel cardboard, combined sealing gaskets or sealants, no matter what material, first check the seals for damage, deformation, aging and roughness. And then take the appropriate measures.

1.Bending radius

Pay attention to the minimum bend radius of the hose when installing the hose assembly. If the bending radius is too small, it will reduce the pressure bearing capacity of the hose and affect its service life.

2. Friction

When the hose is in contact with hard objects or friction as usual, it is recommended to add a spring sheath to the outside of the hose. 

3. Installation and fixing method

For example, it must be fixed, not twisted, and the trajectory can be adapted.

Proper installation of the hose is essential. If the hose is too longBut it affects the appearance and increases the cost, such as the hose is too short,Not enough when it is stretched or compressed

The room for expansion will also cause the hose to be destroyed. and Most of the failure of the hose is due to the hose assembly in the hydraulic.

The installation on the system is not appropriate. In most cases

The lower hose assembly is subjected to unacceptable torsional stresses. bend

The radius of the curve is smaller than the specification in the specification and causes reinforcement

Wear of layer corrosion can also cause many failures.

The first thing to do when the plastic fitting leaks is to do the following: To carry out the repair and seal, the specific operation is as follows: Since the water leaks, the main switch of the water pipe should be found, and the maintenance can be carried out after the shutdown. Check if it is a fitting with this thread screwed together. If this is leaking, you need to unscrew the fitting again, re-wrap the plastic strip on the threaded end, and then re-tighten it. The plastic pipe is a PVC pipe. If it is, you need to cut the leaking water. Go to the hardware store and buy a PVC head. Tell him the diameter of the pipe and you can get it. Then buy a small bottle of PVC pipe glue. After returning, you will directly pay and put it on. If it is not the pipe mentioned above, but the pipe of PPR, if it is such a pipe, it needs to be cut short at the leak, buy a direct head, but the tools used are very different, it should be noted that this The pipe needs to use a hot melt machine, and the two ends of the water pipe are hot melted and then butted together.

The concept of assembly angle exists in a hose assembly with bent joints at both ends. At this point, the assembly angle is defined as follows:

      Place the hose assemblies on the same line and measure the angle between the other joint and the distal joint (vertical direction) clockwise based on the vertical direction of one of the bent joints at the distal end. This angle is the assembly angle. The assembly angle allows an error of ±3°.

The hose assembly must contain at least the following five categories of information:

A: Type of hose. Contains basic information about hose construction and internal diameter.

B: Left end joint type, including joint structure and thread size.

C: Right end connector type, including joint structure and thread size.

D: Length, which is the definition of the straight length of the hose in mm.

E: Supplementary information such as assembly angle, jacket, etc.

1. High precision in manufacturing of hydraulic components and high cost;

2. The quality of the seal, the quality and cleanliness of the lubricant are high and the cost is high;

3. Can not get a fixed ratio transmission;

4. Larger heat generation;

1. Small volume, large torque for transmission and output.

2. The action is stable, safe and reliable, because the oil has a certain vibration absorption energy, and there is a safety valve in the system to automatically limit the overload.

3. The operation is flexible and light, and the speed can achieve stepless speed regulation within a certain range, which not only reduces the labor intensity of the driver, but also facilitates various operations.

4. High production efficiency.

5. Hydraulic parts are automatically lubricated, not easy to rust and wear, easy to maintain and long life.

6. Easy to achieve standardization, serialization and generalization.

The basic characteristics of the hydraulic transmission are: using liquid as the working medium, and transmitting the power by the static pressure of the liquid in the closed container. The static pressure depends on the external load; the transfer of the load speed is based on the principle that the volume of the liquid changes equally. The speed depends on the traffic. The use of various hydraulic valves to control the speed and direction of the pressure oil flow, so that the machine to act according to human requirements, is called hydraulic control.

Although the transition fittings are suitable for different users, it is advantageous for all users to have better fitting application effects. So for many users, you need to work hard to do the following to ensure that the connector shows excellent results. First: do a good job in the selection of hydraulic fittings. The transition fittings that can fully meet the usage requirements will be the best. From this point of view, in order to ensure that the fittings show excellent application results, you need to pay attention to the selection when purchasing the fittings to ensure that Purchased high quality and suitable connectors. Second: provide suitable working conditions. Each type of connector has a specific range of use, and it needs to work under the right conditions to perform well in terms of operation effect and function. In order to ensure the excellent application effect of the transition joint, it is necessary to provide suitable working conditions for use in the use. Third: Optimize the use of hydraulic oil. The viscosity of the hydraulic oil, the oil temperature and the amount of oil will directly affect the operation of the transition fitting, and will also indirectly affect the life of the fitting. Therefore, in order to ensure that the fittings exhibit excellent application results, it is also necessary to pay attention to optimizing the use of hydraulic oil in the process of using the fittings.

The steering design of the current vehicle is set according to the principle of the fifth round of Ekman, that is, the steering angle of the inner wheel of the curve is larger than that of the outer wheel. Then, the trigonometric function calculates that the distance of the inner wheel is shorter than the distance of the outer wheel. Once the distance is different, the rotation speed of the inner and outer wheels (left and right wheels) is inconsistent. If the transmission shaft output from the gearbox is not poor The speeder separates the left and right outputs, so the vehicle cannot adjust the speed of the left and right wheels when cornering. At slow speeds, it is carried by excessive and improper friction, and at high speeds, the inner wheel of the curve is caused by excessive rotation and friction, which causes the tire to jump off the ground and use the axle and suspension to raise the body. The upward movement plus the centrifugal force drive naturally turns over the other side of the turning direction.

Therefore, the left and right wheels of the vehicle are definitely not coaxial type. Especially the modern car has the design of the front wheel drive. Without the structure of the differential, the driver can’t control the steering wheel at all, because the tire is generated by the ground as long as the driver turns the steering wheel. The feedback force strongly pushes the steering wheel back to the center origin, so that the control cannot exist at all, so placing the differential in the center of the transmission wheel is an essential requirement of the transmission system.

Since the differential is driven by a basin gear and an angular gear, the inside includes a side gear and a differential pinion. When the vehicle goes straight, there is no differential action. The differential pinion and the side gear will have no differential action with the rotation of the basin gear. Once the vehicle has different internal and external wheel resistance, the differential gear group is forced by the resistance. The rotation function is generated to adjust the left and right wheel speeds. Since the changes and adjustments of the left and right wheel speeds are generated by the tires and the ground impedance, the subsequent use conditions will cause the vehicle to be unable to travel.

For example, when a vehicle falls into a hole in a round, the wheel has no friction. The ground wheel has a great resistance, and the differential will return all the power to the low-friction wheel. The wheels that fall into the potholes will keep turning, and the ground wheels will be completely inactive, so the wheels will not be able to drive.

 As for the hydraulic transition fittings, you see a lot in your daily life. Why does it often appear in our daily life? Of course, because it is a very important part. Especially in the application of water pipes is more widely, it is because its performance and role are for these services. In fact, hydraulic transition fittings have been widely used in people’s daily life, and in some industrial fields, it is absolutely indispensable. Because it has the corrosion resistance of the fitting, the pressure resistance and high temperature resistance, and the basic characteristics of freezing resistance, these high quality features are enough to make it easy to use in household pipes. The two advantages of corrosion resistance and high temperature resistance have been determined that hydraulic transition fittings can be used in many places in people’s lives. The most common use of hydraulic transition fittings is in the kitchen and bathroom. Because there are water pipes in both places, everyone knows that there is no water in daily life, because in the kitchen, you need to wash vegetables and need to cook. In the kitchen life, basically every household’s kitchen water is very convenient, why water is so convenient, it is all because the hydraulic transition fittings bring convenie

How should the hydraulic fitting be cleaned? What should be paid attention to when cleaning?

First, the part of the steel pipe to which the hydraulic fitting is connected should be pickled, and the relevant treatment should be carried out when pickling, and the ferrule should be fixed in the predetermined steel pipe. This will enable a good cleaning.

Second, the pipe fittings should be cleaned with kerosene when cleaning, and the kerosene cleaning can ensure that the components of the fitting can meet the corresponding standards. After cleaning, it should be packaged and stored. If it is to be used, install it again. This way, the hydraulic fitting can be well protected from contamination.

Third, the oil hole should be checked accordingly. If it is blocked, it should be cleared in time, and then cleaned to ensure smooth operation in the next operation.

Sealing of hydraulic joints for forklifts from structural type

Divided into a plane seal, cone snail

Grain seal, cone seal, cone and O-ring

4 kinds of seals. This article combines practical experience with these

The characteristics of the joint sealing method are analyzed.

Flat seal

Flat seals are divided into combination washer seals and O

Two types of ring seals.

(1) Combination washer seal

Combination washer seal is an early use knot Structure, mostly in the case of pressure below 10MPa

use. It is mainly composed of sodium bolts, sodium joints and

The combination washer is composed as shown in Figure 1. Structure of

The advantage is a wide range of applications, easy to install. its

The disadvantages are 3 points: First, the hydraulic oil will flow to 90°.

Turning and creating small orifice throttling, resulting in oil

The flow energy loss is large; the second is to tighten the snail

During the bolting process, the lip of the combination washer is easily damaged;

Third, the combined gasket disintegration failure often occurs.

Although the hydraulic transition fitting is a small and very inconspicuous transition fitting, it plays a more important role in connection and transition. However, the fitting also has the difference between the bend and the elbow. What kind of difference, what is the role of them.

In fact, the fitting body of the hydraulic transition fitting is a bridge between the hydraulic pipe fitting and the equipment connection. The elbow is a pipe that changes the direction of the pipe, and their division of labor is different. In the hydraulic system of the hydraulic pipe fitting, the components between the high pressure oil pipe and the high pressure oil pipe are connected. Divided into: hydraulic hose, high pressure ball valve, intentional quick fitting, ferrule fitting, welded fitting, high pressure hose, transition fitting, ferrule fitting, three-way fitting, non-standard Pipe fitting, flared pipe fitting, right angle pipe fittings, rotary pipe fittings, quick fittings, stainless steel pipe fitting, copper fittings. When the fitting is connected with the equipment, the connection method does not match or the diameter needs to be changed. This task is completed by the fitting body. One end of the fitting body is connected with the pipe fitting, and one end is connected to the equipment.

The elbow in the hydraulic transition fitting is a pipe that changes the direction of the pipe. Elbows are made of cast iron, stainless steel, alloy steel, malleable iron, carbon steel, non-ferrous metals and plastics. According to the production process, it can be divided into: welding elbow, punching elbow, push elbow, casting elbow, butt weld elbow.

1. The brake drum of the drum brake will increase in diameter after being heated, and the stroke of stepping on the brake pedal is increased, and the brake reaction is less likely to occur than expected. Therefore, when driving a vehicle with a drum brake, it is necessary to avoid the occurrence of thermal degradation of the brake pad due to high temperature caused by continuous braking.

2. The braking system reacts slowly, and the braking force of the brake is less controllable, which is not conducive to high-frequency braking action.

3. Many complicated parts are constructed, and the brake clearance must be adjusted to make maintenance difficult.As the performance and driving speed of the vehicle increase, the disc brake has become the mainstream of the current braking system in order to increase the stability of the brakes at high speeds. Since the brake disc of the disc brake is exposed to the air, the disc brake has excellent heat dissipation. When the vehicle is braked at a high speed or braked for a short time, the performance of the brake is less likely to be degraded, and the vehicle can be obtained. Better braking effect to improve the safety of the vehicle.And because the disc brakes react quickly and have the ability to do high-frequency brakes, many models use disc brakes with ABS systems and VSC, TCS and other systems to meet the needs of such systems requiring fast operation.

Hydraulic quick couplings are mainly used in hydraulic systems and engineering machinery. The material of the main body should be made of metal resistant to vibration and shock (for example: carbon steel, stainless steel, copper). Dimensions and mounting shapes are also varied. Precautions for use

1.caveat

Do not use fluids other than fluids during use.

Do not exceed the pressure limit when working.

Do not use outside the temperature range during operation to prevent damage or leakage of the sealing material.

Do not disassemble by yourself

2.note

Thread-specific sealing material is used for the external thread of the control thread.

When installing, do not exceed the maximum torque to prevent damage to the thread.

Do not use it for purposes other than quick connectors when working.

Do not connect to quick fluid couplings from other companies when working.

Do not artificially hit, bend, stretch, or prevent damage during work.

Do not use it in a place where metal powder or sand is mixed during work to prevent malfunction or leakage.

If it is attached to the work, it may cause poor work or leakage.

The brake valve must be set before the quick connector during operation.

When used in work, such as for machines with vibration and impact, the durability may be reduced.

Do not use water or glycol series media when working. Such substances can cause the surface zinc coating to dissolve.

When a car is driving on a slippery or icy low-friction road, if excessive braking occurs, the wheel will be locked by the brake device and lose grip, resulting in the vehicle losing control of the direction. In order to enable the vehicle to effectively control the direction of advancement on this dangerous road surface, the ABS “anti-lock brake system” was developed. The ABS “anti-lock brake system” with more and more performance can also make the TCS-Traction Control System “tracking control system” and VSC-Vehicle Stability Control “vehicle stability control system” (equivalent to ESP). To control the tracking performance of the vehicle while driving, and to control the stability of the vehicle when cornering.

From the point of view of use, the first condition for the hydraulic system to work properly is that the interior of the system must be clean. It is inevitable that the hydraulic system is contaminated before the new equipment is operated, or after a major overhaul. Although the manufacturer of the hydraulic components pays attention to the internal cleaning of the components themselves, the new components may still contain burrs, chips, Contaminants such as flash, dust, welding slag and paint. Components may also be contaminated due to poor storage and handling. During the production of the fuel tank, rust, paint, dust and the like may accumulate. Although the fuel tank is cleaned before use, many pollutants are hard to see by the naked eye. It is possible to bring contaminants into the system during installation of hoses, pipes and fittings.

Even new fluids contain some unexpected contaminants. Measures must be taken to filter out pollutants as soon as possible, otherwise failures may occur shortly after the equipment is put into operation, and early failures are often severe, and some components such as pumps and motors may be fatally damaged. The purpose of component cleaning and system flushing is to eliminate or minimize early failure of the device. The goal of flushing is to improve the cleanliness of the oil and keep the cleanliness of the system fluid within the pollution tolerance of critical hydraulic components in the system to ensure the reliability of the hydraulic system and the service life of the components.

1. It has the function of automatic braking, so that the brake system can use lower oil pressure or use a brake drum that is much smaller in diameter than the brake disc.

2. The installation of the hand brake mechanism is easy. In some models with rear wheel brakes, the brake mechanism of the drum brakes is installed in the center of the brake disc.

3. The processing and composition of the parts is relatively simple, and the manufacturing cost is relatively low.

1. Because there is no automatic tightening action of the drum brake, the brake force of the disc brake is lower than that of the drum brake.

2. The friction area between the brake pads of the disc brake and the brake disc is smaller than that of the drum brake, so that the braking force is also relatively small.

3. In order to improve the shortcomings of the above disc brakes, a large pedaling force or oil pressure is required. Therefore, it is necessary to use a brake disc having a larger diameter or to increase the oil pressure of the brake system to increase the braking force.

4. The hand brakes are not easy to install. Some models that use disc brakes on the rear wheels add a set of hand brake mechanisms for drum brakes.

5. The brake pads are worn more, and the replacement frequency may be higher.

In hydraulic systems and systems, seals are used to prevent leakage of working media and ingress of foreign dust and foreign matter. The element that acts as a seal, ie the seal. Leakage can cause waste of working media, contaminate machines and the environment, and even cause mechanical failures and equipment accidents. The internal leakage can cause a drastic drop in the volumetric efficiency of the hydraulic system, failing to reach the required working pressure, or even working. Intrusion of tiny dust particles in the system can cause or exacerbate the wear of the friction elements of the hydraulic components, further causing leakage.

Therefore, seals and seals are an important part of hydraulic equipment. The reliability and service life of its work is an important indicator of the quality of the hydraulic system. In addition to the gap seal, the seal is used to control the gap between the adjacent two coupling surfaces below the minimum gap through which the liquid to be sealed can pass. In the contact seal, it is divided into two types: self-sealing compression type seal and self-sealing type self-tightening type seal (ie lip seal).

An intact hydraulic system consists of five parts, namely the power element, the performance element, the control element, the auxiliary element and the hydraulic fluid. The function of the power element is to convert the mechanical energy of the prime mover into the pressure energy of the liquid, which refers to the oil pump in the hydraulic system, which supplies power to the entire hydraulic system. The hydraulic pump is generally constructed in the form of a gear pump, a vane pump and a plunger pump. Hydraulic connector

The function of the fulfillment components (such as hydraulic cylinders and hydraulic motors) is to convert the pressure energy of the liquid into mechanical energy, driving the load to make a linear reciprocating motion or a reverse motion. Control elements (ie various hydraulic valves) manipulate and condition the pressure, flow and direction of the liquid in the hydraulic system. Depending on the control function, hydraulic valves can be divided into pressure control valves, flow control valves and directional control valves. Hydraulic connector

The pressure control valve is further divided into a relief valve (safety valve), a pressure reducing valve, a sequence valve, a pressure relay, etc.; the flow control valve includes a throttle valve, a regulating valve, a split flow collecting valve, etc.; the direction control valve includes a one-way valve, Hydraulic control check valve, shuttle valve, reversing valve, etc. Depending on the control method, the hydraulic valve can be divided into a switch type control valve, a fixed value control valve and a share control valve. The auxiliary components include a fuel tank, an oil filter, a tubing and a pipe joint, a seal ring, a pressure gauge, an oil level oil temperature gauge, and the like. Hydraulic oil is the working medium for transferring energy in hydraulic systems. There are various types of mineral oil, emulsion and synthetic hydraulic oil.

To put it simply, the drum brake is a brake device that uses a brake pad that is stationary in the brake drum to rub the brake drum that rotates with the wheel to generate frictional force to reduce the rotational speed of the wheel.

When the brake pedal is depressed, the force of the foot causes the piston in the master cylinder to push the brake oil forward and generate pressure in the oil passage. The pressure is transmitted to the brake cylinder piston of each wheel via the brake oil, and the piston of the brake cylinder pushes the brake pad outward, causing the brake pad to rub against the inner surface of the brake drum and generating sufficient friction to reduce the rotation speed of the wheel. In order to achieve the purpose of braking.

Folding processing

Mold

Rolling

A method of processing a workpiece by plastically deforming a workpiece by forming a rolling die. Thread rolling is generally in a thread rolling machine. The reeling machine or on an automatic lathe with an automatic opening and closing thread rolling head is suitable for mass production of external threads for standard fasteners and other threaded couplings. The outer diameter of the rolling thread is generally not more than 25 mm, the length is not more than 100 mm, the thread precision is up to 2 (GB197-63), and the diameter of the blank used is approximately equal to the median diameter of the thread to be machined. Rolling generally cannot be machined, but for workpieces with softer material, the grooveless extrusion tap can be used to cold-squee the internal thread (up to a diameter of up to 30 mm). The working principle is similar to tapping. The torque required for cold extrusion of the internal thread is about 1 times larger than the tapping, and the machining accuracy and surface quality are slightly higher than the tapping.

The advantages of thread rolling are: surface roughness is less than turning, milling and grinding; the surface of the thread after rolling can improve strength and hardness due to cold work hardening; high material utilization rate; productivity is doubled and more convenient than cutting. Automate; rolling die life is long. However, the rolling thread requires that the hardness of the workpiece material does not exceed HRC40; the dimensional accuracy of the blank is required to be high; the precision and hardness of the rolling mold are also high, and it is difficult to manufacture the mold; it is not suitable for rolling the asymmetrically shaped thread.

he hydraulic swivel joint is internally provided with a separate pipe, and this pipe can support the needs of different working conditions, so the practical function of the hydraulic swivel joint is very strong when in use. In operation, the hydraulic rotary joint generally acts as a hydraulic medium for transport. When transmitting, the transmission medium enters the interior from the side or the rear end according to the specific conditions of the work, and then passes through the hydraulic rotary joint. The operation transports the media.

Types of

1.Main brake system

The brakes commonly used when driving a car are all foot operations, so they are also called Foot Brake. When the driver steps on the brake pedal, the brake force is transmitted to the brake device of the wheel by mechanical or hydraulic pressure to cause friction.

2.Parking brake system

The parking brake is also called the hand brake, which is a braking device that prevents the vehicle from sliding when the vehicle is parked. Generally, it is installed in the middle brake mode of the transmission shaft, and directly controls the rear wheel brake type.

3.Anti-lock brake system

When a car is driving on a slippery or icy low-friction road, if excessive braking occurs, the wheel will be locked by the brake device and lose grip, resulting in the vehicle losing control of the direction. In order to enable the vehicle to effectively control the direction of advancement on this dangerous road surface, the ABS “anti-lock brake system” was developed. The ABS “anti-lock brake system” with more and more performance can also make the TCS-Traction Control System “tracking control system” and VSC-Vehicle Stability Control “vehicle stability control system” (equivalent to ESP). To control the tracking performance of the vehicle while driving, and to control the stability of the vehicle when cornering.

On a cylindrical or conical surface, a continuous projection of a defined tooth shape formed along a spiral. A bulge is a solid portion of both sides of a thread. Also known as the tooth.

In machining, the thread is cut on a cylindrical shaft (or the inner hole surface) with a cutter or a grinding wheel. At this time, the workpiece rotates one turn, and the tool moves a certain distance along the axial direction of the workpiece. The traces cut out are the threads. The thread formed on the outer surface is called an external thread. The thread formed on the surface of the inner bore is called an internal thread. The basis of the thread is the helix of the surface of the circular shaft. Generally, if the cross section of the thread is a triangle, it is called a triangular thread; the section is trapezoidal called a trapezoidal thread; the section is a zigzag thread called a zigzag thread; the section is a square called a square thread; the section is a circular arc called a circular thread.

Composition

The brake system consists of a control system, a hydraulic system and a power assist system.

1. Control system: pedal, hand brake, etc.

2. Hydraulic system: composed of hydraulic oil, brake pump and hydraulic oil pipe

The hydraulic oil guide is a hydraulic medium used in a hydraulic system using liquid pressure energy, and functions as energy transfer, system lubrication, anti-corrosion, rust prevention, and cooling in the hydraulic system. For hydraulic oil, the requirements of the viscosity of the hydraulic device at the working temperature and the starting temperature should be met first. Since the viscosity change of the oil is directly related to the hydraulic action, the transfer efficiency and the transfer accuracy, the viscosity temperature performance of the oil is also required. Shear stability should meet the various needs of different applications. The brake pump consists of a master brake pump (Master Brake Cylinder) and a brake cylinder (Front & Rear Wheel Brake Cylinder). It is the main part of the hydraulic brake. It has a tank for storing brake oil and a cylinder inside. There are pistons. The piston is acted upon by the brake pedal in the cylinder and then pushed by the push rod. The brake oil pressure in the cylinder is transmitted to each wheel cylinder. It is also a hydraulic brake device and is arranged in the brake cylinder of each wheel.

3. Power assist system: vacuum booster pump

4. Electronic control system: composed of ABS pump, ABS sensor, ABS computer

5. Execution system: composed of brake calipers, brake pads and brake discs

The function of the hydraulic system is to increase the force by changing the pressure. A complete hydraulic system consists of five parts, namely the power element, the actuator, the control element, the auxiliary element (accessory) and the hydraulic fluid. Hydraulic systems can be divided into two categories: hydraulic drive systems and hydraulic control systems. The hydraulic drive system is primarily designed to transmit power and motion. The hydraulic control system is such that the hydraulic system output meets specific performance requirements (especially dynamic performance). The so-called hydraulic system is mainly referred to as the hydraulic transmission system.

A complete hydraulic system consists of five parts, namely the power element, the actuator, the control element, the auxiliary element (accessory) and the hydraulic fluid.

Power component

The function of the power element is to convert the mechanical energy of the prime mover into the pressure energy of the liquid, referring to the oil pump in the hydraulic system, which provides power to the entire hydraulic system. The structure of the hydraulic pump generally includes a gear pump, a vane pump, a plunger pump and a screw pump.

  operating units

Actuating elements (such as hydraulic cylinders and hydraulic motors) convert the pressure energy of the liquid into mechanical energy, driving the load for linear reciprocating or swiveling motion.

  control element

Control elements (ie various hydraulic valves) control and regulate the pressure, flow and direction of the liquid in the hydraulic system. Depending on the control function, hydraulic valves can be divided into pressure control valves, flow control valves and directional control valves. The pressure control valve includes a relief valve (safety valve), a pressure reducing valve, a sequence valve, a pressure relay, etc.; the flow control valve includes a throttle valve, a regulating valve, a split flow collecting valve, etc.; the directional control valve includes a one-way valve, and the hydraulic control Check valve, shuttle valve, reversing valve, etc. According to different control methods, hydraulic valves can be divided into switch control valves, fixed value control valves and proportional control valves.

Auxiliary component

Auxiliary components include fuel tanks, oil filters, coolers, heaters, accumulators, tubing and fittings, seals, quick-change fittings, high pressure ball valves, hose assemblies, pressure taps, pressure gauges, oil level gauges, oils Thermometer and so on.

  Hydraulic oil

Hydraulic oil is the working medium for transferring energy in hydraulic systems. There are various types of mineral oil, emulsion and synthetic hydraulic oil.

1. This thread is equivalent to the NPT threaded part of the American National Standard ANSI B1.20.1. Only a conical internal thread and a conical external thread are a connection.

2. The same point of the 60° conical pipe thread and the 55° conical pipe thread:

2.1. The thread itself is sealed.

2.2. Cone angle: 1:16

2.3. Control the diameter dimension by controlling the base distance (reference length).

2.4. It is permissible to add a seal to the thread pair.

3. Difference between 60° conical pipe thread and 55° conical pipe thread: Table 4

Item 60° Tapered Pipe Thread 55° Tapered Pipe Thread

Mark NPT 3/8 Rc 3/8, Rp3/8, R3/8

Tooth angle 60° 55°

Different tooth distances Table 5 Table 2

Tolerance requirements high low

Uses Pipeline connections in automobiles, airplanes, and machine tools Low-pressure piping systems such as water and gas

The hydraulic components have gradually achieved standardization and serialization, and their specifications, varieties, quality and performance have been greatly improved. Especially after the adoption of new technologies and new technologies such as electronic technology and servo technology, the quality of the hydraulic system has been significantly improved. It has played a major role in the national economy and military industry. From a different perspective, the hydraulic system can be divided into different forms.

(1) According to the circulation mode of the oil, the hydraulic system can be divided into an open system and a closed system. The open system means that the hydraulic pump draws oil from the fuel tank. After the oil passes through various control valves, the hydraulic actuator is driven, and the oil is returned to the fuel tank through the reversing valve. The structure of the system is relatively simple, and can play the role of heat dissipation and sedimentation of the oil tank, but the oil often comes into contact with the air, so that the air easily penetrates into the system, resulting in unstable movement of the mechanism. The open system has a large fuel tank and the oil pump has good self-priming performance. In the closed system, the oil inlet pipe of the hydraulic pump is directly connected to the oil return pipe of the actuator, and the working fluid is closed in the pipeline of the system. The compact structure has less chance of contact with air, and the air does not easily penetrate into the system, so the transmission is relatively stable. The shifting and commutation of the working mechanism is achieved by adjusting the variable mechanism of the pump or motor, avoiding the hydraulic shock and energy loss that occurs during the commutation of the open system. However, the closed system is more complicated than the open system, because there is no oil tank, and the heat dissipation and filtration conditions of the oil are poor. To compensate for leaks in the system, a small flow of charge pump and fuel tank is usually required. Due to the unequal flow of the single-rod double-acting cylinders, the power utilization is reduced during operation, so the actuators in the closed system are generally hydraulic motors.

(2) According to the number of hydraulic pumps in the system, it can be divided into single pump system, double pump system and multi pump system.

(3) According to the type of hydraulic pump used, it can be divided into a quantitative pump system and a variable pump system. The advantage of the variable pump is that it can make full use of the power of the engine within the adjustment range, but its structure and manufacturing process are complicated and costly. It can be divided into manual variables, control variables as much as possible, servo variables, pressure compensation variables, constant pressure variables. , hydraulic variables and other ways.

(4) According to the way of supplying oil to the actuator, it can be divided into series system and parallel system. In the series system, the oil return of the last actuator is the oil entering the next actuator, and the pressure is reduced once for each actuator. In the series system, when the main pump supplies oil to the actuators controlled by the multi-way valve, as long as the outlet pressure of the hydraulic pump is sufficient, the recombination of the movements of the respective actuators can be achieved. However, since the pressure of the actuators is superimposed, overcoming the external load capacity will decrease as the number of actuators increases. In a parallel system, when a hydraulic pump supplies oil to a set of actuators, the flow into each actuator is only a fraction of the output of the hydraulic pump. The distribution of the flow varies with the load on the top and bottom of each piece. First, the actuator with a small external load is entered. Only when the external load on each actuator is equal, the simultaneous action can be realized. The mechanical performance of the full hydraulic transmission depends mainly on the performance of the hydraulic system, including the quality of the components used, and whether the basic circuit is appropriate. The performance of the system, in addition to meeting the functional requirements, should be carried out from the aspects of the efficiency, power utilization, speed range and fine-tuning characteristics of the hydraulic system, vibration and noise, and whether the installation and commissioning of the system is convenient and reliable. Modern engineering machinery almost adopts hydraulic systems, and combined with electronic systems and computer control technology, has become an important part of modern engineering machinery.

Precautions during use: Non-metal flat gasket seal joint peeling protective sleeve (coated tube) from the end of the buried tube with a special tool to cut off the covered tube about 50mm long, so that one end of the metal bellows is exposed; cut the bellows if corrugated If there is a significant flash, burr or ellipse at the end of the tube, use a pipe cutter to cut 1-3 wave rings along the bottom of the bellows at the exposed end until the inner hole of one end of the bellows is rounded. If the length of the exposed end is not made after cutting the bellows, the covered tube should be continuously cut to compensate for the length of the exposed end (not less than 50 mm).

The processing flange is loaded with the connecting nut to the exposed end of the bellows, and then the flange is processed by a special tool for flange processing. The flange is made of three waves of the bellows. The seal is connected to the sealing ring on the flange flat pad, and then the connecting nut is connected with the joint or the valve. Metal ball cone hard seal connection 1) Stripping protective cover (same as metal flat pad seal).

Cut the bellows (same as the metal flat gasket seal). The rising shape is loaded into the exposed end of the bellows, and then the special shape of the bellows is used to make the shape rise, so that the first wave bottom of one end of the stainless steel bellows is about the same as the outer diameter of the front and rear peaks. The trimming side uses a portable grinding wheel or scissors to remove the rounded portion of the opening at the end of the bellows. After trimming, the edge of the opening should be free of burrs.

The tapered flange is machined with a special tool for taper flange processing. The end of the corrugated shape is machined into a conical flange, and the flange surface is polished with 200# sandpaper. The sealing connection joint nut is connected with various metal ball cone hard sealing joints or valves. The laying of the buried pipe 1) The wall surface or the concrete above the ground slot can be grooved on the wall or the ground along the pipe laying direction to satisfactorily lay the requirements of the underground pipe. The width of the groove shall be such that the thickness of the pipe cover is not less than 20 mm on the wall surface and not less than 100 mm on the concrete floor.

Before laying the pipe on the wall, you can use the cement nail to clamp the pipe to the front and fix it (the bayonet is facing outward). The pipe clamp distance is about 200mm, and then the pipe can be pushed into the pipe clamp to fix it. Add the overburden cover pipe to the end of the pipeline, check the ventilation, pressurize with the pressure gauge to view or use the soapy water to change the joint to see if the device is not properly caused to leak. After seeing that there is no leakage, the cement can be used to fill the sealed pipe at the slot. It is necessary to expose the wall or the ground of the joint of the pipe to facilitate the connection with the appliance.

A complete hydraulic system consists of five parts, namely the power element, the actuator, the control element, the auxiliary element and the working medium.

The function of the power element is to convert the mechanical energy of the prime mover into the pressure energy of the liquid. A power component is a hydraulic pump in a hydraulic system that provides power to the entire hydraulic system. The structure of the hydraulic pump generally includes a gear pump, a vane pump, a plunger pump, and a screw pump.

The function of the actuator is to convert the pressure energy of the liquid into mechanical energy, and drive the load to make a linear reciprocating motion or a rotary motion. Actuators have hydraulic cylinders and hydraulic motors.

Control elements (ie various hydraulic valves) control and regulate the pressure, flow and direction of the liquid in the hydraulic system.

Depending on the control function, hydraulic valves can be divided into pressure control valves, flow control valves and directional control valves. The pressure control valve is further divided into a relief valve (safety valve), a pressure reducing valve, a sequence valve, a pressure relay, etc.; the flow control valve includes a throttle valve, a regulating valve, a split flow collecting valve, etc.; the directional control valve includes a one-way valve, Hydraulic control check valve, shuttle valve, reversing valve, etc. According to different control methods, hydraulic valves can be divided into switch control valves, fixed value control valves and proportional control valves.

Auxiliary components include accumulators, filters, coolers, heaters, tubing, pipe joints, fuel tanks, pressure gauges, flow meters, seals, etc., which assist in connecting, storing, filtering, and measuring oil pressure. Refer to “Hydraulic Transmission” and “Hydraulic System Design Series”.

Working medium refers to hydraulic oil or emulsion in various hydraulic transmissions. There are various types of mineral oil, emulsion and synthetic hydraulic oil. The hydraulic system is used to achieve motion and power transmission.

1. UNC Coarse Thread Series This series is usually used in mass-produced bolts, screws, nuts and other general engineering. Low-strength materials, such as castings, mild steel and other soft materials, should be threaded with internal threads to give the internal threads the best trip strength. UNC threads are suitable for applications requiring quick disassembly or possible corrosion and minor damage.

2. UNF Fine Thread Series This series is suitable for bolts, screws, nuts and other applications where coarse threading is not recommended. The UNF external thread has a larger tensile stress area than the coarse thread. Fine threading is preferred when the tripping strength of the external thread and the matching internal thread is required to be equal to or higher than the tensile load carrying capacity of the externally threaded part. Fine thread is also suitable for short screw lengths, small thread lift angles or wall thicknesses where fine pitch is required. If the maximum strength of the external thread is not required, the fine thread can also be used for the internal thread processed on the low-strength material, but the appropriate screw length must be selected to meet the above-mentioned trip strength requirements. Fine thread sizes less than or equal to 1 inch are suitable for bolts, screws, nuts and other threaded fasteners. Sizes greater than 1 inch, fine thread not applicable unless the internal and external threads are of the same material.

3. UNEF Superfine Thread Series This series is suitable for thin-walled tubes, thin nuts, short sleeves or short joints where short-spinning length and smaller pitch are required. In general, it also applies to several cases specified above for fine thread.

4. UN constant pitch series Various constant pitch series of 4, 6, 8, 12, 16, 20, 28 and 32 teeth per inch provide a wide range of special design requirements that cannot be met by the UNC, UNF and UNEF series. Diameter/pitch combination. The constant pitch series is used for parts that have been assembled and disassembled multiple times or for parts that are refurbished. When selecting threads from a constant pitch series, the list of 8, 12 or 16 teeth should be preferred.

5. High-temperature and high-strength use For these applications, the thread with a size of 0.25~1 inch is recommended to use the coarse thread series, while for the size larger than 1 inch, the 8-tooth series is preferred.

Hydraulic components can be divided into three categories: power components and control components and actuator components. Although they are all hydraulic components, their own functions and technical requirements for installation and use are not the same.

Power components: refers to various hydraulic pumps, gear pumps, vane pumps, piston pumps, screw pumps.

1. Two types of structure: gear oil pump and series pump (including external meshing and internal meshing).

2. Blade oil pump (including single stage pump, variable pump, double stage pump, double pump).

3. Plunger oil pump is divided into axial piston oil pump and radial piston oil pump. Axial piston pump has quantitative pump and variable pump. (Variable pump is divided into manual variable and pressure compensation variable, servo variable, etc. Kind of) It is divided into two types of oil distribution methods: end face oil distribution and valve type oil distribution, and the radial oil pump type is basically a valve type oil distribution. );

Actuator: hydraulic cylinder and hydraulic motor, hydraulic cylinder has piston hydraulic cylinder, plunger hydraulic cylinder, swing hydraulic cylinder, combined hydraulic cylinder; hydraulic motor has gear hydraulic motor, blade hydraulic motor, plunger hydraulic motor;

Control elements: directional control valve, check valve, reversing valve;

Pressure control valve: relief valve, pressure reducing valve, sequence valve, pressure relay, etc.;

Flow control valve: throttle valve, speed control valve, diverter valve;

Auxiliary components: other components than the above three parts, including pressure gauges, oil filters, energy storage devices, coolers, pipe fittings {mainly include: various pipe joints (flare, welded, ferrule, sae method) Lan), high pressure ball valves, quick-change joints, hose assemblies, pressure taps, pipe clamps, etc., and fuel tanks, etc., are equally important.

(1) The hose cannot be bent excessively during moving or stationary, nor can it be bent at the root, at least 1.5 times its diameter.

(2) When the hose is moved to the extreme position, it should not be pulled too tightly. It should be loose.

(3) Try to avoid the torsional deformation of the hose.

(4) The hose is as far away as possible from the heat radiation member, and the necessary to mounting insulation board.

(5) The external damage of the hose should be avoided, such as long-term friction on the surface of the same component during use.

(6) If the hose is excessively deformed due to its own weight, there should be supporting parts.

Precautions for use:

For the fluid to conduct a dissolution test of the sealing material, confirm whether the material is suitable.

Use Teflon sealing tape for the external thread of the control thread.

Do not exceed the maximum tightening torque when installing the threads to prevent damage.

To reduce friction (insertion load) and protect the “O” ring when inserting, apply fluid or pure water to the “O” ring or quick coupling (“O” ring pleats).

When separating, a small amount of fluid flows out, and in order to prevent danger, compressed air can be used to discharge and separate the fluid inside the quick joint.

Please do not use it as a twisted link.

Do not use anything other than a quick fluid coupling.

Do not artificially hit, bend, stretch, or prevent damage.

Do not pressurize the casing or quick coupling unit to prevent the valve from flying out.

The specified dust cover must be attached to the unit.

Do not disassemble the quick connector.

There are thousands of reasons for hydraulic hose failure, but with the most appropriate precautions, the most common failures can be avoided. Here are the 8 most common causes of hose failure.

1.Inner rubber layer corrosion

Corrosion of hydraulic hoses often causes external leakage. Inner rubber layer corrosion is usually caused by concentrated high velocity fluids or by fine particles in the fluid.

To avoid corrosion of the inner rubber layer, determine the appropriate hose size based on the recommended maximum flow rate. In addition, it should be ensured that the hose assembly does not produce excessive tight bending and that the fluid medium does not cause excessive abrasion of the inner rubber layer of the hose. It is important to comply with the maximum bend radius and diameter requirements specified in each hose engineering specification during hose assembly.

2. Fluid compatibility

Incompatible fluids can cause deterioration, expansion, and delamination of the inner layer of the hose assembly. In some cases, the inner layer may also be partially destroyed.

The hose must be compatible with the fluid being transported. Make sure that the fluid is not only compatible with the inner layer, but also with the outer layer, joints and even O-rings.

3. Dry air / old air

The inner layer of the hose may create many tiny cracks due to stale or dry air. Sometimes this type of failure is difficult to detect because the hose can still remain flexible, but there are signs of external leakage.

To avoid dry or obsessed air problems, you should verify that your hose rating is suitable for extremely dry air. For these applications, it is best to use a hose with PKR or EPDM rubber rubber material. If possible, increase the dew point of the air.

4. Minimum bending radius

If the minimum bend radius is not met, the hose assembly may fail relatively quickly.

In vacuum or suction applications, if the bend radius is exceeded, the hose may become flat in the bend area. This will hinder or limit the flow of the medium. If the bend is too severe, the hose may become kinked. To prevent hose failure with minimal bend radius, the recommended bend radius should be carefully checked.

Quick Connector For Inert Gas Note:

1. Please use the sealing material for the external thread of the control thread.

2. Do not artificially hit, bend, stretch, or prevent damage.

3. Please do not use it for fluids other than fluids.

4. Please do not use it for purposes other than quick connectors.

5. Do not connect to quick fluid couplings from other companies.

6. Do not use it in places such as metal powder or sand dust to prevent malfunction or leakage.

7. If the foreign matter is attached, it may cause poor work or leakage.

8. The brake valve must be set before the quick connector.

9. Please do not use it as a hinge joint.

10. If used in machines with vibration and shock, the durability will be reduced.

1. Basic tooth type: tooth angle 60°. The taper is 1:16. The tooth type is a flat top.

2. Basic types

NPT general purpose US standard taper pipe thread

American standard straight pipe thread for NPSC pipe joints

NPTR guide rod connection with American standard taper pipe thread

Free-fit mechanical connections on NPSM devices with US standard straight pipe threads

Loose-fit mechanical connection of NPSL lock nut with US standard straight pipe thread and UNS–thin wall pipe for special uniform thread on thin-walled pipe

1. Dry-sealed pipe threads are mainly used for fuel and lube pipe fittings, refueling and draining plugs, military gas bombs, etc. for coolers, ships, automobiles and aircraft.

2. The characteristics of the dry-sealed pipe thread is to control the amount of flattening of the crest and the bottom of the tooth to ensure that the contact between the metal and metal outside the crest is first or simultaneously with the side contact. Contact between the crest and the base prevents thread leakage and ensures a tight seal connection without the use of lubricant and seal packing.

3. Dry-sealed inner pipe threads can be cylindrical or conical. The dry-sealed outer pipe thread has only one conical shape. All dry-sealed pipe threads are right-handed.

 China’s hydraulic oil pipe has been very mature after years of development. Hydraulic oil pipes are mainly used for non-corrosive or corrosive media such as oil, water and gas. With the increasing demand for such products in many fields, the promotion and promotion of such products is also called the focus of business work. The hydraulic pipe joint is a component between the high pressure oil pipe and the high pressure oil pipe in the hydraulic system.

   Hydraulic pipe fittings can be divided into hydraulic hoses, high pressure ball valves, quick fittings, ferrule type pipe fittings, welded pipe fittings, high pressure hoses, transition pipe fittings, ferrule type pipe fittings, three-way pipe fittings, and the like. Hydraulic oil pipe is a kind of special product. The key points that need to be paid attention to when promoting it are the hydraulic oil pipe fittings specification standard. The hydraulic oil pipe fittings specification standard is often the focus of users. Because the impact of the sudden bursting of the hydraulic oil pipe is very large, it is not possible to replace the special fittings with ordinary ones, because the hydraulic pressure can withstand a lot of pressure, and the normal maximum pressure of 0.5 is already fast.

1. Mark: 3/8-18NPT.

2. Basic diameter and reference distance: The basic diameter of the taper pipe thread is determined according to the outer diameter of the pipe, the pitch and the length of the hand. The nominal length of the hand-threaded joint between the inner and outer threads is the reference distance, and the base of the internal thread. The surface is the section at the large end of the thread (the diameter of the thread on the section is the basic diameter), and the base of the external thread is at a reference distance from the small end.

3. Common thread size

Size code Number of teeth per inch Large diameter Medium diameter Small diameter Recommended bottom hole Reference distance Number of teeth

1/8 27 10.242 9.489 8.736 φ8.6 4.102 4.36

1/4 18 13.616 12.487 11.358 φ11.1 5.786 4.10

3/8 18 17.055 15.926 14.797 φ14.5 6.096 4.32

1/2 14 21.223 19.772 18.321 φ17.9 8.128 4.48

3/4 14 26.568 25.117 23.666 φ23.2 8.611 4.75

1 11.5 33.228 31.461 29.694 φ29.2 10.160 4.60

1-1/4 11.5 41.985 40.218 38.451 φ37.9 10.668 4.83

1-1/2 11.5 48.054 46.287 44.520 φ43.9 10.668 4.83

Precautions for use:

1.Do not use fluids other than fluids.

2.Do not exceed the maximum use pressure limit when using.

3.Do not use outside the operating temperature range to prevent the seal material from being worn or leaking.

4.Do not artificially hit, bend, stretch, or prevent damage.

5.Do not use it in areas such as metal powder or sand to prevent malfunction or leakage.

6.For the installation of thread type, do not exceed the maximum tightening torque during installation to prevent damage.

7.Do not use hoses with cracks to prevent leakage or falling off.

8.For use in machines with vibration and shock, the durability will be reduced.

9.The fluid used must be a clean fluid that has been filtered through the filter.

10.Do not disassemble the quick connector.

(1) The most important part of the pre-installation of the 1 ferrule type pipe fitting directly affects the reliability of the seal. A dedicated preloader is generally required. fittings with small pipe diameters can be pre-assembled on vise. The specific method is to use a fitting as the mother body and press the nut and the ferrule onto the pipe. There are mainly types of ferrule-type straight-through pipe fittings, ferrule-type straight-through heads, and ferrule-type three-way pipe fittings. The author found that even if the same manufacturer has a batch of goods, the depth of the tapered holes on these fittings is often different, resulting in leakage, and this problem is often overlooked. The correct way to do this is to connect the connector at one end with the connector, and the corresponding connector is pre-assembled with the same type of connector to minimize leakage. 2 The end face of the pipe should be flush. After the pipe is sawn, it should be ground and smoothed on tools such as grinding wheels, and the burrs should be removed, cleaned and washed with high-pressure air before use. 3 When pre-installing, the coaxiality of the pipe and the fitting body should be kept as much as possible. If the pipe is too skewed, the seal will be invalid. 4 The pre-loading force should not be too large, so that the inner edge of the ferrule is just embedded in the outer wall of the pipe, and the ferrule should not be obviously deformed. When connecting the pipes, assemble them according to the specified tightening force. The tightening force of the ф6-1 ferrule is 64-1 15n, 16 фmmr 259n, and ф18mm is 450n. If the ferrule is severely deformed during pre-assembly, the sealing effect will be lost.

(2) It is forbidden to add fillers such as sealant. In order to obtain a better sealing effect, a sealant was applied to the ferrule, and as a result, the sealant was flushed into the hydraulic system, causing malfunction of the hydraulic component clogging.

(3) When connecting the pipeline, the pipe should have sufficient deformation allowance to avoid the tensile force of the pipe.

(4) When connecting the pipeline, it should be avoided to be subjected to the lateral force, and the lateral force is too large to cause the seal to be not strict.

(5) When connecting the pipeline, it should be done once and avoid multiple disassembly, otherwise the sealing performance will be deteriorated.

Card ferrule fitting installation

(1) Pipes requiring pickling shall be pickled prior to the requirements of Chapter 9;

(2) Cut the pipe with a saw or a special pipe cutter according to the required length. It is absolutely not allowed to use melt (such as flame cutting) or grinding wheel cutting; remove the inner and outer round burrs, metal chips and dirt at the pipe end; remove the rust of the pipe fitting. Agent and dirt; at the same time ensure the roundness of the pipe;

(3) Insert the nut and the ferrule into the tube successively, and the front edge of the ferrule (small diameter end) is at least 3 mm away from the tube mouth, and then the tube is inserted into the taper hole of the fitting body, and the top is up;

(4) Tighten the nut slowly and turn the tube until it is not moving, then tighten the nut 2/3~4/3 times;

(5) Disassemble the inspection ferrule if it has been cut into the pipe and the position is correct. The ferrule is not allowed to move axially and can be rotated slightly;

(6) Re-tighten the nut after passing the inspection.

  1. UNC Coarse Thread Series This series is usually used in mass-produced bolts, screws, nuts and other general engineering. Low-strength materials, such as castings, mild steel and other soft materials, should be threaded with internal threads to give the internal threads the best trip strength. UNC threads are suitable for applications requiring quick disassembly or possible corrosion and minor damage.

  2. UNF Fine Thread Series This series is suitable for bolts, screws, nuts and other applications where coarse threading is not appropriate. The UNF external thread has a larger tensile stress area than the coarse thread. Fine threading is preferred when the tripping strength of the external thread and the matching internal thread is required to be equal to or higher than the tensile load carrying capacity of the externally threaded part. Fine thread is also suitable for short screw lengths, small thread lift angles or wall thicknesses where fine pitch is required. If the maximum strength of the external thread is not required, the fine thread can also be used for the internal thread processed on the low-strength material, but the appropriate screw length must be selected to meet the above-mentioned trip strength requirements.

    Fine thread sizes less than or equal to 1 inch are suitable for bolts, screws, nuts and other threaded fasteners. Sizes greater than 1 inch, fine thread not applicable unless the internal and external threads are of the same material.

  3. UNEF Superfine Thread Series This series is suitable for thin-walled tubes, thin nuts, short sleeves or short joints where short-threading lengths and smaller pitches are required. In general, it also applies to several cases specified above for fine thread.

  4. UN constant pitch series of various constant pitch series of 4, 6, 8, 12, 16, 20, 28 and 32 teeth per inch provides a wide range of diameters for special design requirements not met by the UNC, UNF and UNEF series. / pitch combination. The constant pitch series is used for parts that have been assembled and disassembled multiple times or for parts that are refurbished. When selecting threads from a constant pitch series, the list of 8, 12 or 16 teeth should be preferred.

  5. High-temperature and high-strength applications For these applications, it is recommended to use a coarse thread series for threads with a size of 0.25 to 1 inch, and a series of 8 teeth for sizes larger than 1 inch.

Installation precautions for high pressure hose fittings 

(1) The hose cannot be bent excessively during moving or stationary, nor can it be bent at the root, at least 1.5 times its diameter;

(2) When the hose is moved to the extreme position, it should not be pulled too tightly and should be slack;

(3) Try to avoid the torsional deformation of the hose;

(4) The hose should be as far away as possible from the heat radiation member, and the necessary heat insulation board;

(5) The external damage of the hose should be avoided, such as long-term friction on the surface of the same component in use;

(6) If the hose is excessively deformed due to its own weight, there should be a supporting member.

In hydraulic systems, whether it is a metal pipe joint or a hose joint, there is a problem that leakage is likely to occur. For the ferrule type pipe joint, most of the pipe is subjected to a large external force or impact force, causing the ferrule to loosen or the pipe end face to be deformed to cause leakage. At this time, it should be checked whether the ferrule is out of round, the cutting edge is defective, and the pipe end is Integrity and the degree of compression of the ferrule nut, etc., while eliminating the external force of the pipe. For the flared pipe joints, most of them are caused by excessive flare, quality is not required or disassembled many times, causing leakage due to flaring deformation or cracking. At this time, the front end can be cut off and re-expanded. If the male and female cones are used for sealing, the leakage is mostly due to the damage of the two tapered surfaces, and the tapered surface can be ground with abrasive sand. In some cases where the “о” ring is sealed by the end face or the outer diameter, the leakage causes the following: “о” ring is aged or deformed to cause leakage; “о” ring assembly is not in place, so that the two planes are connected The pressure is not flat or the “о” ring is cut to cause leakage; the “о” ring is not compacted, and the amount of elastic deformation is insufficient to cause leakage; the “о” ring is too deep to cause leakage. In this regard, it is necessary to re-select the “о” ring with the same outer diameter and thick section, or cut or grind the sealing plane with the groove to reduce the depth of the groove, so that “о” The ring has sufficient elastic deformation (the compression should generally be between 0.35 and 0.65 mm). For the leakage of pipe joints with oil-resistant rubber sheets, wool felts, mild steel cardboard, combined sealing gaskets or sealants, no matter what material, first check the seals for damage, deformation, aging and roughness. And then take the appropriate measures.

(1) Pipes should try to avoid high temperature radiation and cooling water spray, etc., where the temperature is too high or too low, especially the hose joint;

(2) The piping should not affect the operation of the main equipment, etc. It must be safe and reliable, convenient for work, observation and maintenance;

(3) The pipe should be horizontal and straight, neat and beautiful. Minimize cornering or small angle bends, use large arcs to reduce oil flow resistance;

(4) When the installation is in conflict, the small pipe and the low pressure pipe should be made to allow the high pressure pipe;

(5) Pipes shall not be in contact when they cross each other and shall be separated by a certain distance;

(6) The joints of parallel pipes should be staggered to avoid affecting the installation and disassembly;

(7) For the purpose of easy disassembly and cleaning, the joint should be properly installed, but it should be used less to reduce the possibility of leakage.

In hydraulic systems, whether it is a metal pipe fittings or a hose fittings, there is a problem that leakage is likely to occur. For the ferrule type pipe joint, most of the pipe is subjected to a large external force or impact force, causing the ferrule to loosen or the pipe end face to be deformed to cause leakage. At this time, it should be checked whether the ferrule is out of round, the cutting edge is defective, and the pipe end is Integrity and the degree of compression of the ferrule nut, etc., while eliminating the external force of the pipe. For the flared pipe joints, most of them are caused by excessive flare, quality is not required or disassembled many times, causing leakage due to flaring deformation or cracking. At this time, the front end can be cut off and re-expanded. If the male and female cones are used for sealing, the leakage is mostly due to the damage of the two tapered surfaces, and the tapered surface can be ground with abrasive sand. In some cases where the “о” ring is sealed by the end face or the outer diameter, the leakage causes the following: “о” ring is aged or deformed to cause leakage; “о” ring assembly is not in place, so that the two planes are connected The pressure is not flat or the “о” ring is cut to cause leakage; the “о” ring is not compacted, and the amount of elastic deformation is insufficient to cause leakage; the “о” ring is too deep to cause leakage. In this regard, it is necessary to re-select the “о” ring with the same outer diameter and thick section, or cut or grind the sealing plane with the groove to reduce the depth of the groove, so that “о” The ring has sufficient elastic deformation (the compression should generally be between 0.35 and 0.65 mm). For the leakage of pipe fittings with oil-resistant rubber sheets, wool felts, mild steel cardboard, combined sealing gaskets or sealants, no matter what material, first check the seals for damage, deformation, aging and roughness. And then take the appropriate measures.

Hydraulic fittings definition
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Hydraulic joints are different hydraulic components (pumps, transfer lines, reversing valves, shut-off valves,

Hydraulic motors, hydraulic cylinders, and some auxiliary components, such as liquid level gauges, thermometers, pressure gauges, etc., are connected to form a closed loop hydraulic system, which is a fitting for connecting. The sample image is shown on the right:

Connector characteristics

The high-strength pressure that the hydraulic joint can withstand. If the hydraulic oil pipe joint has blisters, small holes or too high pressure, it cannot withstand such a large pressure, and the impact force generated by the blasting is quite large.

Hydraulic fittings type

Hydraulic joints are mainly divided into two categories: hose joints, hard joints

Each of these two categories is divided into several subcategories:

1) Hose fittings are divided into one-piece hose couplings, crimping hose couplings, and internal locking hose fittings, detachable hose fittings, etc.

2) The hard pipe joint is also called the transition joint. It is divided into DIN card sleeve type and metric thread joint.

Inch threaded joints, American threaded joints, welded flanges, mining joints, etc.

Application field

Hydraulic joints are widely used in military, energy, petrochemical, electric power, ships, automobiles, rail transit,In the hydraulic piping system of various industries such as construction machinery, mining, metallurgy, steel mills and marine engineering.

The hydraulic air quick connector is mainly used for air piping and pneumatic tool fittings. A wide variety of body materials, sizes, and mounting shapes are available for their use.

Precautions for use:

1. Please do not use it for purposes other than quick fluid couplings.

2. Please do not use it for fluids other than fluids.

3. Please do not connect with fast fluid connectors from other companies.

4. Do not exceed the maximum operating pressure when using.

5. Do not use outside the operating temperature range to prevent the seal material from being worn or leaking.

6. Do not artificially hit, bend, stretch, or prevent damage.

7. Do not use it in places such as metal powder or sand dust to prevent malfunction or leakage.

8. If you attach debris, it will cause poor work or leakage.

9. Do not disassemble the quick connector.

(1) The hose cannot be bent excessively during moving or stationary, nor can it be bent at the root, at least 1.5 times its diameter;

(2) When the hose is moved to the extreme position, it should not be pulled too tightly and should be slack;

(3) Try to avoid the torsional deformation of the hose;

(4) The hose should be as far away as possible from the heat radiation member, and the necessary heat insulation board;

(5) The external damage of the hose should be avoided, such as long-term friction on the surface of the same component in use;

(6) If the hose is excessively deformed due to its own weight, there should be a supporting member.

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HYDRAULIC FITTING

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HYDRAULIC FITTING

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HYDRAULIC FITTING

Metric fitting including the metric female , metric male and metric adapter fittings , they are very common used in the world , almost every customer will buy this type of fitting most, type have 20111 , 20411 , 20511 and so on .

A system in the formal input before the general need to go through the rinse, the purpose of rinsing is to remove residues in the system contaminants, metal chips, fiber compounds, iron cores, etc., in the first two hours of work, even if not completely damaged the system, will cause a series of failures.   

Therefore, the following steps should be taken to clean the system oil path: 1, with a easy-to-dry cleaning solvent to clean the fuel tank, and then with filtered air to remove solvent residue.   

2, cleaning system all piping, in some cases need to be impregnated with pipes and joints.   3, in the pipeline loading oil filter, to protect the valve of the tubing road and pressure pipeline.   

4. Install a flushing plate in the collector instead of a precision valve, such as an electro-hydraulic servo valve.

5, check whether all piping size is appropriate, the connection is correct. All along, we have a professional brand, innovation and development, reputation for survival, Service tree image, well received by our customers! We sincerely welcome friends from all walks of life come to discuss cooperation and work together to create tomorrow.

One: According to the equipment operating conditions (temperature) and hydraulic media conditions, select the appropriate hose. Hose work environment temperature through high or too low will affect the life of the hose and pressure capacity, so to the extent permitted to use hoses, operating temperature for a long time is not within its allowable range of the system, should be used soft pipe sets or procurement of special hoses.

If it is a special medium, make sure that the inner, outer, joint, and sealing rings of the hose are compatible with the media. Second, according to the pressure of the system, determine the maximum working pressure of the hose. Each hose has a maximum working pressure, and the blasting pressure of the hose is 3-4 times the maximum working pressure. The higher the pressure resistance of the hose, the higher the price, so according to the actual pressure of the system, choose the maximum working pressure of the hose, can ensure the normal operation of the system, but also save procurement costs.

If the system impact pressure is frequent, to choose a hose with a high pulse life, at the same time, the maximum working pressure of the purchase hose should be appropriately improved. Third, according to the flow of the choice of hose inner diameter, pipe diameter too small will increase the flow rate of the tube medium, so that the system heat, reduce efficiency, and will produce excessive pressure drop, affecting the performance of the entire system, pipe diameter over the General Assembly to increase procurement costs, affecting the normal operation of the system, so the hose inner diameter should be appropriate

When the hose is fixed with a pipe clamp or the hose passes through the steel plate, also pay attention to the outer diameter size of the hose. Four, in the selection of high-pressure hose should pay attention to the bending radius of the high-pressure hose, the calculation of the bending radius should be subtracted from the front joint buckle length.

If the hose bending radius of the device is too small, it will reduce the pressure capacity of the hose and reduce its service life.

Five, according to the hydraulic layout of the reasonable choice of joint way, joint angle and hose assembly assembly angle. Finally, the hose in the assembly process, but also need to pay attention to a few problems, hose too long, increase procurement costs; The hose is too short, when it is pressed to stretch or shrink, there is not enough telescopic allowance, will cause abnormal damage to the hose, hose assembly, do not let it twist, otherwise significantly reduce the service life of the hose, It even causes abnormal damage to the hose or loosening the joint, and the hose installed between the moving parts should be reserved for sufficient length and to prevent friction with other objects. If the hose is often in the use of friction with the hard object, it is recommended in the Tube plus spring sheath or soft pipe cover, nylon sheath, spiral protective sleeve, glue pipe cover and other sheath series.

1, before the use of inspection: before the use of hose, please confirm that the appearance of the hose has no abnormal trauma, hardening, softening, discoloration and so on.

2, regular inspection: During the use of hose, please be sure to implement 1 periodic inspection per month.

Iv. Security matters:

1, operators to wear safety protective clothing, including gloves, rubber boots, eye shields, these equipment is mainly used to protect the safety of operators.

2, to ensure that the work area is safe and orderly.

3. Check that the joint on each pipe is firm. 4. Do not put the pipe in a pressure-resistant state when not in use. The closing pressure extends the service life of hoses (silicone hoses, Teflon hoses, rubber hoses, food-grade hoses, sanitary hoses, thermoplastic rubber hoses, sanitary plastic hoses).

How to install the high pressure hose assembly correctly?  believes that the use of high-pressure hose friends will know that this installation method is very important, a little carelessness or the installation method is not correct, light will shorten the service life of the hose, heavy can cause safety hazards.   Here are some of the experiences I have learned and used to learn from. 

Correct installation of high-pressure hose is very important to the specific situation I am divided into six kinds. Do not let the high-pressure hose twist when installing a high-pressure hose.   

Otherwise, when the pressure is received, it will damage the high pressure hose or the connection is relaxed.   

When the bending radius of high pressure hose is too small, we should pay attention to the reasonable practice is to use right-angled joints to avoid sharp bend distortion of high pressure hose. When the high pressure hose is under pressure, the length of the high pressure hose will change  if the stroke of the steel wire layer inside the high pressure hose is large, the length of the pressurized high pressure hose will be shorter. Conversely, the length of the high-pressure hose will become longer.  General Products Some kind of error, so the length and shortening can not be avoided. If the high pressure hose is installed, there is a bending place. No fixing device should be added to the bending position of the high pressure hose. High pressure hoses should be allowed to move freely.   Once fixed to death, it is easy to cause increased wear and tear in the buckle.   

In order to avoid the damage of the high pressure hose and the limitation of the flow rate, the bending radius of the high pressure hose should be increased as much as possible.

When installing high pressure hose, remember not to let the high pressure hose twist or when under pressure it is easy to break the high pressure hose or make the buckle joint loose. Six  installation of high-pressure hose  should leave a certain amount of space  avoid the high pressure hose in the operation of friction with the object. If you can’t avoid  try to get some protective measures.

The inner adhesive layer of the hose directly bears the wear and erosion of the conveying medium and prevents its leakage, and the outer layer protects the skeleton layer from external damage and erosion, and the skeleton layer is the bearing layer of the hose, which gives the strength and stiffness of the tube body. The working pressure of the hose depends on the material and structure of the skeleton layer. Hose according to its skeleton layer material and structure can be divided into all-glue hose, clamp hose, attract hose, woven hose, winding hose, knitted hose, short fiber hose. Among them, the suction hose works under negative pressure, steel wire braided hose or winding hose can withstand 80~600mpa and even higher pressure.

Both the diagram method and the literal expression method can describe the structure of the hose assembly, but they are not as fast as the symbolic notation and are easy to organize production.

To this end, special development of this order guide.

Taking the type a hose assembly with inner diameter 16mm, two layers of steel, and a long 1000mm (the distance of the end surface of two cores) as an example, the corresponding provisions of various “joint forms” and “connecting nuts” are described.

First, both ends are direct head, Universal nut (refers to the single nut specification in accordance with JB/T8727-2004 requirements), omit “connector form” and “connector Nut”, writing:

A16Ⅱ-1000

Note: The number of wire braided or wire winding layers is expressed in Roman numerals Ⅰ, Ⅱ, Ⅲ, Ⅳ, etc.

Two, one end of the direct head, the other end of the the bend joint, Universal nut, writing:

16ⅱ-1000 A/aw

Note: When the elbow is at a different angle, add an angle after “w”, such as “W45°”.

Third, the two ends of the bend joint, the same direction, Universal nut, writing:

A16Ⅱ-1000 w/w V0°

Note: The two elbow space relative angle v commonly used in the division of 0°, A/R, 180°, 270°, the definition of the provisions of item eighth.

Four, the NUT is not universal or both ends of the NUT regulation is not the same, must be specified “connection nut” item, such as:

A16Ⅱ-1000 2-m30x1.5

A16Ⅱ-1000 m27x1.5-m30x1.5

A16Ⅱ-1000 m27x1.5-m30x1.5w

V. When the joint form of the two ends is different, the “joint form” item must be specified, such as:

16ⅱ-1000 A/D

16ⅱ-1000 a/m27x1.5-d/m30x1.5

Six, the two ends of the thread for the pipe thread or the United State Unified fine tooth thread, the thread code and specifications are stated, such as:

D16Ⅱ-1000 G3/4 “x14

C16Ⅱ-1000 UNF7/8 “x14

Seven, hose assembly with ordinary spring, after the length of the addition of “” symbol, such as: D16Ⅱ-1000

Hydraulic hose in the installation needs to master a certain amount of professional knowledge and experience, then what are the skills in the installation?

Today we come together to find out:

1, hose bending installation, should be maintained at the same level, to prevent distortion, so as not to cause leakage, abnormal blasting or pipe joint extraction and other phenomena in use. 2, hose assembly length to have a certain amount of surplus.

Because the hose is under pressure, it should be installed in a straight state, so that the hose should have a certain relaxation. 3, avoid the hose in the joint near the sharp bending.

If unavoidable, accessory accessories must be used to change the installation angle.

4. When the two ends of the hose are used for relative motion, the bending part of the hose shall always be kept on the same plane to prevent the hose from twisting and affect the service life. 5, to avoid the hose in the bending part of the fixed.

When it is necessary to be fixed, its bending radius should be taken at the position of the hose when pressurized, and an appropriate margin should be added.

6, if the hose is in the repeated bending use of the state, the hose should be fully stretched length, and its bending part radius control greater than the specified limit, in order to avoid extreme bending near the fixed joint.

7, the tube body in the mutual rubbing user, installation should be equipped with the appropriate fixture, to prevent direct contact with the tube body.

8, the two ends of the hose fixed on different planes, should be in the appropriate part of the hose clamping fixed, so that it formed their respective in the same plane movement of two parts.

9, Hose length selection and installation layout should be reasonable, as far as possible to avoid the formation of unnecessary bending, so easy to cause bending of the lateral tube blasting phenomenon. Have you mastered all of this introduction? Warmly welcome you to come to buy, we will be in line with the purpose of high quality and low price for your service.

1, suitable for all kinds of vibration, rapid rotation, large strength equipment and narrow space;

2, cost-effective, light weight, high precision;

3, can be equipped with manual hydraulic pump, pneumatic hydraulic pump and electric hydraulic pump;

4, a number of hydraulic nuts can be used at the same time;

5, do not need to use the scale, but by the structural design of the measuring ring, accurate and stable direct measurement of the bearing required axial force into the distance;

6, installation and disassembly of the discharge sleeve, you can use the same specifications of the hydraulic nut, which is the attached scale or hanging link block and other patented design of the hydraulic nut can not be equipped;

7, the use of measuring ring additional screws to decompose the nut replacement damaged O-ring, than the general design to save time and parts costs; 8, can be installed sealed bearings, no need to measure the internal clearance of bearings to determine the axial force of the bearing.

1. The tensile mode is not affected by the lubrication effect of bolts and the friction size of the thread, and more accurate bolt load can be obtained.

2, can be synchronized stretching of multiple bolts, so that the whole ring bolt Force is uniform, get a balanced load;

3, due to the use of the most advanced ultra-high pressure hydraulic technology, can be in a very small space to complete the locking of bolts;

4, stretching mode to fasten the bolts to obtain the residual load and payload than the torque mode is greater; 5, stretching method is more suitable for fastening precision requirements of high bonding applications, it can make the connection surface force evenly achieve bonding, really prevent leakage.

Hydraulic nut is an advanced bolt assembly method, especially suitable for narrow space and heavy load vibration mechanical fastening.

The working principle of the hydraulic nut is to use the hydraulic cylinder to apply the external force directly to the bolt, so that the bolts subjected to the force are elongated in its elastic deformation zone, and the bolts are stretched to tighten the locking ring on the hydraulic nut, so that the bolts will be locked in the elongated position. The hydraulic cylinder is located at the axis of the bolt and is used for axial stretching of the bolts to achieve the amount of stretching required by the bolts. And it is this stretch of the bolt that determines the clamping force required to fasten the bolt. When the hydraulic nut is pressurized, the bolts are stretched, while the hydraulic nut and the bonding surface are pressed. Thus the axial deformation of the bolt is locked, that is, the remaining bolt load is locked in the nut. Many connecting surfaces are equipped with gaskets. The gasket only works when the connecting surface is pressed, so it is especially important that the connection surface remains clamped at all times. The load applied to the bolt is proportional to the oil pressure in the hydraulic cylinder, and such a design can retain the payload with great precision. Since the load is applied directly to the bolt and all forces are used for bolt elongation, the load required to produce the minimum space.

Hydraulic nuts are used for bolts that need to be disassembled frequently, for pretightening of oversized bolts, and for locking of large workpieces. and can do hydraulic overflow connection disassembly tools. Installing or removing bearings on conical shafts or bushings is often a difficult and time-consuming project. Use hydraulic nuts. You can increase productivity and reduce such problems. The principle is that the hydraulic oil is generated by the high-pressure oil pump input nut to drive the piston force. Meet the installation or disassembly of bearings-effortlessly, both accurate and safe.

1.  Metric FittingsMertic Flat Seal Fittings 
Metric Multiseal Fittings
Metric 60°Cone Seal Fittings 
Metric 74°Cone Seal Fittings
Metric 24°Cone O-RING Seal L..T Fittings
Metric 24°Cone O-RING Seal H.T.Fittings
Metric Standpipe Straight Fittings
JIS Metric 60°Cone Seal Fitting
2. British FittingsBSP O-RING Seal Fittings 
BSP Flat Seal Fittings
BSP Multiseal Fittings
BSP 60°Cone Seal Fittings
BSPT Fittings
JIS BSP 60°Cone Seal Fittings
3. American FittingsSAE O-RING Seal Fittings 
ORFS Flat Seal Fittings
NPSM 60°Cone Seal Fittings
JIC 74°Cone Seal Fittings
NPT Fittings SAE Flange L.T. Fittiings
SAE Flange H.T.Fittings
4. Staplelok FittingsBanjo Double connection 
interlock Hose Fittings
5. FerruleFERRULE for SAE100R1AT/ EN 853 1SN HOSE
FERRULE for SAE100R1A EN 853 1ST HOSE
FERRULE for SAE100R2AT/DIN20022 2SN HOSE
FERRULE for SAE100R2A/EN 853 2SN HOSE
FERRULE for SAE100R1AT-R2AT,EN853 1SN-2SN and EN 857 2SC
FERRULE for 4SP,4SH/10-16,R12-06-16 HOSE
FERRULE for 4SH,R12/32 HOSE