Radio – Electro – Hydraulic Control Technology

February 7th, 2017

The combination of electro-hydraulic control technology and wireless communication technology can be widely used in engineering machinery and other fields, not only improve the degree of automation and maneuverability of the construction machinery, but also improve the working environment  angle straightener of the operator, reducing the Due to visual constraints caused by the misuse of the accident. In the construction machinery such as construction, mining and other industries have been widely used to speed up the process of national industrialization.

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First, the basic principles of radio-electric control technology
First, the radio hydraulic control system operator or machine control instructions to digital processing (including the signal filtering, A / D conversion and other processing), into a simple digital signal processing; secondly, the radio frequency control system, , The digital instruction signal encoding process; again, the command signal in the digital modulation by the transmission system, through the transmitting antenna in the form of radio waves transmitted to the distant receiving system. Finally, the receiving system through the receiving antenna to control the command angle bender with the radio wave received down, after demodulation and decoding, converted to control instructions, to achieve the various types of valve control.
Because of its important position in the field of construction machinery, it has attracted more and more attention from all over the world. It has invested a lot of technical resources and funds for research and development. Although the infrared remote control can also achieve remote control of electro-hydraulic control technology, but because of the existence of infrared remote control on the background of high demand, high energy consumption, transmission distance is short (usually not more than 10 meters), and must be in the same line, There are any obstructions and susceptibility to industrial heat radiation and other shortcomings, making the radio and electric liquid control technology has become the main direction of the current study.
Second, the status and trends of the research on radio-electro-hydraulic control technology
(1) Research status of radio electro-hydraulic control technology
Initially, the remote control electro-hydraulic control system is the use of wired remote control manner. As early as the early 60s, people can use the streamer remote control device to control the hydraulic machinery manual, electro-hydraulic multi-valve, the operation of the cable through the remote control device on the bi-directional rocker output linear proportional signal to control the electro-hydraulic Proportional multi-way valve, wire box rocker signal can fully simulate the hydraulic multi-way valve manual rod action. Although this approach allows the operator to operate the machine outside of the operating area, the control signal is attenuated in the cable so that the distance of the remote control is limited and the flexibility of the cable is affected by the presence of the cable , And a few meters long cable is often the main source of accidents in the production.
With the maturation of radio technology, the radio technology into electro-hydraulic control system has become possible. As the radio-electric liquid control custom cnc machine technology is to pass radio waves to control the command, completely eliminating the streamer-type remote control devices brought about by hidden dangers. But the beginning of the radio hydraulic control system can only launch a simple command, such as: open / close and other instructions. Into the 1970s, with the large-scale integrated circuits and the emergence of special microprocessors, developed a more reliable handheld wireless remote control system. Later, with the rapid development of digital processing technology, wireless digital communication technology matures, the use of digital communication technology, anti-interference ability, easy to digital signal processing, and so the advantages of making remote control system anti-jamming performance At the same time, the rapid development of analog integrated circuit design, a variety of high-precision analog / digital converters (A / D) and digital / analog converter (D / A) of the successful development, and the development of high-performance, They can be applied to the radio-electro-hydraulic control system so that the radio-hydraulic control system can not only transmit the switching signal, but also can transmit the analog control quantity and have higher resolving power to the control command, that is, the radio-hydraulic control system not only can control the ordinary Electromagnetic switch valve, but also to control the proportional valve.
As the electro-hydraulic control technology has the advantages of electro-hydraulic control technology, but also the advantages of wireless technology, so it has a very wide range of applications, especially in the field of construction machinery. Typical applications of the radio-electro-hydraulic control system are industrial vehicles, truck cranes, lorry cranes, concrete pumps (jibs), shield-boring machines and the like.

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The early 80s, the United States Kraft TeleRobtics and John Deere and other companies, have developed a wireless remote control system, and used in excavators, the successful launch of 3D CNC Drilling Machine remote excavator. Among them, the more typical is John Deere’s 690CR remote excavator.
In 1983, Japan’s Komatsu research and development of a variety of work devices of the micro-control and composite operation of the radio control, and successfully converted PC200-2 hydraulic excavator.
In 1987, the German HBC company successfully developed for engineering machinery in the field of industrial radio remote control devices. The remote control device uses advanced digital communication technology, transmission ratio control signal safe, reliable and practical, and has a high resolution of the transmitted instructions; use of analog technology at the receiving end can make the implementation of acceleration and deceleration movements And the radio remote control device is completely proportional to the action on the transmitter, in order to achieve the stepless control of the implementing agencies. Using it, combined with electro-hydraulic proportional servo drive mechanism, hydraulic proportional multi-way valve and electro-hydraulic proportional pressure reducing valve and the general electromagnetic control on-off valve, can realize the construction machinery wireless remote control. German HBC radio remote control system uses the proportional output signal (0-5V / 10V, 4-20mA, PWM0-2A) with a number of manufacturers of bevelling machine electro-hydraulic multi-valve signal matching, simulation can be achieved manually with the hydraulic control system to each other .
Compared with the research and application of radio-electro-hydraulic control technology in foreign countries, the domestic is relatively late, the technology is relatively lagging behind. Shanghai Baoshan Iron and Steel Company in 1997, the introduction of HBC wireless remote control system, Italy FABERCOM proportion of hydraulic servo module, the Yellow River Engineering Machinery Plant produced ZY65-type crawler loader remote control transformation, making it a remote control loader.
(2) Research trends of radio electro-hydraulic control technology
With the rapid development of digital communication technology and VLSI, the application of digital communication technology and high-performance, highly integrated integrated circuits to radio-electro-hydraulic control technology makes the performance of radio-electrohydraulic controller more perfect and reliability higher. . (1) the rapid development of VLSI to improve the reliability of the hardware circuit of the radio hydraulic controller, at the same time to provide a more powerful function for the realization of the (1) the development of ultra-large-scale integrated circuits, possibility;
(2) digital communication technology to improve the performance of the radio electro-hydraulic controller;
(3) error correction coding technology to improve the radio anti-jamming capability of liquid control.
Third, the conclusion
As the electro-hydraulic proportional technology has many advantages, in the field of construction machinery has been widely used. The application of this technology in engineering machinery will have important engineering application significance.

The new laser heterodyne method: the establishment of high – frequency hydrophone calibration installation

January 20th, 2017

Recently learned from the China Institute of Metrology, the Institute in the international first use of new laser heterodyne method to set up high-frequency hydrophone calibration installation sheet metal punch, the frequency of China’s high-frequency ultrasound measurement of the upper limit from the existing 5MHz to 60MHz, Ultrasonic diagnosis and treatment, detection of higher supply of more accurate calibration source. People are accustomed to the general frequency of more than 20kHz sound waves called ultrasound, ultrasound because of its good point, penetrating power is strong, easy to get more concentrated sound energy, foreign trade clerk is widely used in medical diagnosis, treatment and industrial testing . High-frequency hydrophone is the most important component in influencing the safety evaluation and performance evaluation of ultrasonic diagnostic facilities.


High-frequency hydrophone is a kind of high-frequency sensor that can hear the sound in the water, can receive the ultrasonic signal in the water and transform it into electric signal. High frequency hydrophone accurate or not, to protect the security of ultrasound diagnostic facilities busbar bending cutting punching machine, ultrasound treatment facilities angle drill machine, the accuracy of the dose is essential. China Institute of Metrology started in 2009 in the study, the research group using reciprocal technology and laser heterodyne craft two ways to set up a high-frequency hydrophone calibration installation, which up to 60MHz laser heterodyne calibration power Internationally for the first time steel punch press. According to the project leader, deputy director of the China Institute of Metrology, Yang Ping, deputy director of the introduction, the group controlled laser heterodyne technology to carry out high-frequency hydrophone calibration power, frequency range 5MHz ~ 60MHz, measurement uncertainty is better than 16% (K = 2), calibration frequency range and degree of uncertainty into the international first echelon.

Pneumatic implementation of the original fault handling approach Pneumatic

December 26th, 2016

Pneumatic implementation of the original fault handling approach Pneumatic actuator failure Due to improper assembly and long-term use of the cylinder, the pneumatic actuator is prone to internal and external leakage, the output force is not enough and the action is not smooth, poor cushioning effect, pneumatic piston rod and cylinder head damage and other symptoms. 1. Cylinders appear inside and outside the leak, usually due to eccentric piston rod installation, lack of oil supply, seals and seal rings wear or damage, the cylinder impurity and the piston rod caused by scars and so on. Therefore, when the cylinder inside and outside leakage, should re-adjust the center of the piston rod to ensure the concentricity of the piston rod and cylinder; must always check the reliability of the work of the lubricator to ensure good lubrication of the implementation of components; pneumatic punch When the seal ring and seal ring wear or damage ring, must be promptly replaced; if there is impurity in the cylinder, should be promptly removed; piston rod scars, should be renewed.

2. Cylinder output and lack of action is not smooth, the general pneumatic punch is due to the piston or piston rod is stuck, poor lubrication, lack of air supply, or the cylinder with condensed water and impurities and other reasons. In this regard, the center of the piston rod should be adjusted; check the operation of the oil mist is reliable; air supply pipe is blocked. When the cylinder has condensed water and impurities, should be promptly removed. 3. cylinder cushioning effect is poor steel punching machine, usually due to buffer ring wear or damage caused by adjustment screw. In this case, replace the seal ring and adjustment screw. 4. Cylinder piston rod and cylinder head damage, usually due to eccentric piston rod or buffer mechanism does not work caused by drilling machine suppliers. In this regard, adjust the center of the piston rod position; replace the buffer seal or adjustment screw busbar machine.

Pneumatic punching force – will you calculate it?

December 26th, 2016

Pneumatic punching force – will you calculate it? Calculate the tonnage of various tonnage of pneumatic punching force, according to punching plate material specific components, aperture, plate thickness, spring return material to calculate, generally because of different material composition band saw machine, tensile strength is not the same. Such as A3,45 #: A3 tensile strength of 42kg / mm2 .45 # of the tensile strength of 47kg / mm2. In this case, Stamping mainly know that iron (steel) plate shear strength (shear strength is 70% of tensile strength) on the line. For example: punching a 45 # material of iron, 2mm thick, 30mm diameter hole needs much impulse load? It is known that the iron plate is 45 # = 47 kg = 47/70% = 32.9 kg Formation: 45 # steel plate shear strength is 32.9kg / mm2. Solution: 30×3.14x2x32.9 = 6047.6 kg (Kg) This is the pure impulse load. In fact, also need to consider the rubber or spring back material metal stamping, the number of concave die set plate punching machine, die, punch die wear and other factors. Like you this 6048Kg to Plus 50% -100%, that is, 10T and 16T. \thow is it? Friends now you will? More pneumatic punch information, please

Pneumatic punch accuracy of the meaning – you understand?

December 26th, 2016

Pneumatic punch accuracy of the meaning – you understand? Many customers in the procurement of presses, we will ask us pneumatic punching on the accuracy of a standard in the end what is the meaning of the specific test is what the project is not the actual punching accuracy of the production? Pneumatic punch press production, punch accuracy is very important. Punch precision directly affects the accuracy of stamping products Head punching machine, die life.

The accuracy of the press is divided into the static accuracy of the punch when it is not loaded and the dynamic accuracy of the load (punching) angle machine. Pneumatic punching is a very important dynamic precision in punching production. Due to the use of punching machine, the actual load capacity varies greatly steel hole punch. Therefore, it is technically difficult to formulate the specifications, so it has not yet been integrated and the accuracy is represented by static precision.

Pneumatic punch the main application areas

December 26th, 2016

Pneumatic punch the main application areas In this case, Pneumatic punch the main application areas Pneumatic punch more health, clean! The use of advanced optical protection technology, can achieve a significant increase in safety performance, computer count and program coordination, unattended processing can be achieved, greatly improving the efficiency of the work and reduce production costs. Applicable to all kinds of metal and non-metallic pipe, sheet metal punching areas. In this case, Machinery industry: stamping parts, stamping processing, metal stamping parts steel beam fabrication, metal stamping parts, automotive stamping parts, stretching pieces, metal stretching pieces, stamping sheet metal parts.

In this case, Household goods: electronics, communications, electrical, lighting, toys, chassis, furniture, sports equipment, barbecue utensils hardware, lighting hardware, electronic hardware, chassis cabinets, kitchen utensils, hinges, cotter pin, , Packaging materials, stickers, cell phone membrane drilling equipment for sale, gaskets, mats, aluminum parts, terminals, speaker network Road traffic: transportation supplies, automotive / security, protective equipment, automobile and motorcycle accessories communications products bus bar bending machines. In this case, Office supplies: power counters, ATM teller shell, air-conditioning parts, printers, copiers racks and various types of precision sheet metal.

Pneumatic Pneumatic Technology With the continuous improvement of production automation

December 26th, 2016

Pneumatic Pneumatic Technology With the continuous improvement of production automation, pneumatic Pneumatic Technology Pneumatic rapid expansion of the application of surface, pneumatic products continue to increase the variety of specifications, performance, quality continues to increase, the market value of steady growth welding gantry. Pneumatic products trends mainly in the following areas: First, miniaturization, integration Limited space requirements Pneumatic components of the external dimensions as small as possible, miniaturization is the main trend. Now the smallest cylinder diameter is only f2.5, and the preparation of the switch; solenoid valve width of only 10mm, the effective cross-sectional area of ​​5mm2; interface f4 valve has also been developed. According to the survey, the demand for miniaturization of components, about every 5 years doubled. The integration of the valve is not only a few valves together, but also contains the sensor, programmable logic controller and other functions. The purpose of integration is not only to save space, but also conducive to the installation, maintenance and reliability of work Steel Punching. Second, the combination of intelligent The simplest combination of components is a valve with a switch cylinder. In the material handling, has been used in the cylinder, swing cylinder, pneumatic chuck and vacuum chuck assembly; there is a combination of moving small items, with the director of the two cylinders are X and Y axis combination But also with a solenoid valve, program-controlled, compact structure, small footprint, adjustable travel. Nippon Seiki Co., Ltd. develops intelligent valve with sensor and logic circuit, which is a combination of pneumatic and photoelectric technology. Without an external actuator, can directly read the sensor signal, and the logic circuit to determine the decision to follow the implementation of intelligent components and valve work. Development of functional modules have been more than 10 years of history, is now constantly improving. These general-purpose modules can be combined with a variety of programs to achieve different mechanical functions, economical, practical and convenient. Third, precision In order to make the positioning of the cylinder more accurate, the use of sensors, proportional valve to achieve feedback control, positioning accuracy of 0.01mm.

In the cylinder precision also developed 0.3mm / s low-speed cylinder and 0.01N micro-load cylinder. In the gas source treatment, the filter accuracy of 0.01mm, the filter efficiency of 99.9999% of the filter and the sensitivity of 0.001MPa pressure reducing valve has been developed. Fourth, high-speed In order to improve productivity, automation of the beat is accelerating, high-speed is an inevitable trend. The current piston speed range of the cylinder is 50-750mm / s. The piston speed of the cylinder is required to be increased to 5 m / s and up to 10 m / s. According to the survey, five years later, the speed of 2-5m / s, the cylinder demand will increase 2.5 times, 5m / s above the cylinder demand will increase 3 times. Correspondingly, the response speed of the valve will be accelerated, from the current 1/100 seconds to 1/1000 second level. 5, no oil, tasteless, sterile Human beings increasingly demanding on the environment, so no lubrication of the pneumatic components will be universal. Some special industries, such as food, beverages, pharmaceuticals, electronics, more stringent requirements on the air, in addition to no oil, but also requires tasteless, sterile, such special requirements of the filter will continue to develop. Sixth, high life, high reliability and self-diagnostic function 50 million life of the valve and 3000 km of the cylinder has been commercialized, but in the textile machinery has a high-frequency valve life requirements of more than 100 million times, the best up to 200 million times. This requirement is difficult to achieve with existing elastomeric sealing valves, which places renewed emphasis on the gap sealing element. Numatics Corporation has a valve, the use of clearance seal, vent valve body in the valve was suspended after the state, the formation of friction-free movement, as well as self-dust function, valve life can be more than 200 million times, which Although it is an old product, or worth learning. Pneumatic components are mostly used in automatic production line, component failure will often affect the operation of the entire line, the sudden stop of the production line, resulting in serious losses, for this, the reliability of pneumatic components made a high demand. Jiangsu, a chemical fiber company requires the supply of pneumatic components in the set life is absolutely reliable, whether due to continue to use, all replaced. Here also put forward the balance of life of various types of components, the so-called life expectancy design. Since the self-diagnosis function of the pneumatic system is referred to the agenda, the components and systems for self-diagnosis function, such as the prediction life, are being developed, in order to ensure the reliability of the work and to sacrifice the life index. With the multi-functional mechanical devices, more and more wiring, not only increased the installation and maintenance workload, but also prone to failure, affecting the reliability of work, so wiring system for the improvement of pneumatic components and system designers Attention. 7, energy saving, low power consumption Energy conservation is a permanent issue, and will be set in the establishment of ISO14000 environmental protection system standards. Pneumatic components of the low power consumption is not only for energy, but more importantly, can be combined with microelectronic technology. 0.5W power consumption of the solenoid valve has long been commercialized, 0.4W, 0.3W of the valve has also been developed by the PC direct control. Eight, mechanical and electrical integration In order to accurately achieve pre-set control targets (such as switches, speed, output force, position, etc.) should be closed-loop feedback control. Gas – electric signal conversion, has become the key to achieve closed-circuit control, proportional control valve can be the interface of this conversion.

In the future for a long period of time to develop various forms of proportional control valve and electro-pneumatic proportional / servo system, and its performance, reliable, cheap is the development of pneumatic technology is a major issue. Now the application of proportional / servo system has been many examples, such as the precise positioning of the cylinder; for the vehicle suspension system to achieve good damping performance; cable car tilting device automatically when turning; serving the patient’s robots. How to be more practical examples, more economical to be further improved. 9, to meet the special requirements of certain industries In the fierce market competition, for some specific requirements of the development of industry-specific pneumatic components is an important aspect of opening up the market, the plants are very concerned about. The domestic pneumatic industry has recently developed special cylinder (high temperature, self-locking), special cylinder (seismic, high reliability), rail lubrication special valve (anti-cold, self-filtering ability), environmentally friendly automotive gas system Multi-media, excellent performance) and so on. 10, application of new technologies, new processes, new materials Die-casting new technology (hydraulic core-pulling, vacuum die-casting, etc.), deburring new technology (explosion, electrolysis, etc.) have been in the country And gradually extended; piezoelectric technology, bus technology, new soft magnetic materials, dialysis filters are being applied; super finishing, nanotechnology will also be transplanted. Pneumatic industry scientists pay special attention to the development of new trends in the seal, once the new structure and new materials, seals appear, will be used. 11, standardization Implementation of standards CNC Angle Punching Machine, especially ISO international standards is the principle that enterprises must abide by. It has two aspects to do: The first is the pneumatic products should implement the existing pneumatic-related standards, such as terms, technical parameters, test methods, installation dimensions and safety indicators. The second is to establish standards for enterprises to ensure that the system, the existing three: quality (ISO9000), environmental protection (ISO14000) and security (ISO18000). Standards in the growing and revised, enterprises and their products will continue to follow the development and update, the only way to promote the steady development of pneumatic technology. 12, security From the recently issued on the ISO international standards for pneumatic, we can see that the safety of pneumatic components and systems requirements are very strict. ISO4414 Pneumatic General will be dangerous elements into 14 categories, mainly mechanical strength, electrical appliances, noise, control failure and so on. ISO International has also promulgated the ISO18000 standard, requiring companies to establish safety assurance system hydraulic hole punch machine, the security issues on the agenda of particular importance. To this end, product development and system design to effectively consider the safety index is also the general trend of the development of pneumatic technology. For domestic enterprises, due to past industry standards to ignore the safety problems, it is necessary to re-enter the market of products re-assessment and amendment. At the PTC exhibition in 2001, SMC of Japan showed the linear motor prominently. As a pneumatic multinational company with international influence, the development of linear motor has its specific meaning, that is to remind the visitors: linear motor has alternative pneumatic components trend. Some people will therefore be regarded as the sunset industry, pneumatic industry, the author can not agree, there are several reasons: 1, due to gas compressibility, pneumatic products can achieve soft contact, gentle movements. Pneumatic technology of this feature is unmatched by other mechanical and electrical products.

Pneumatic spring and Japan Fukuoka stadium moveable roof air pressure seal is a small one big two typical example. There are many examples: Automatic Milking Robot, Simulated Massage, Lifting Patient’s Robot, Chinese Medicine Simulated Teaching Device, Simulated Acceleration Seat for Airplane Driving Training and so on. The above examples, once a pneumatic product, can not be replaced by other products. 2, some specific environment, such as fire, explosion, high temperature, high humidity and other occasions, pneumatic components have their unique adaptability, if replaced with other mechanical and electrical products, will increase the cost of many users will not accept. 3, the pneumatic system can work in the gap state output of large energy, anti-overload capability, which is the weak link in the motor, difficult to replace. 4, vacuum, jet technology has been integrated with the traditional pneumatic technology, their products have become a part of pneumatic products, combined with the application of these two technologies, but also other electromechanical devices can not be replaced. For example, the pipeline transportation of dust, ultra-small, light goods handling, floating slip, mechanical processing of thin-plate positioning of the workpiece and air spinning. In addition, there are certainly many examples to illustrate the pneumatic technology has its unique advantages, not the sunset industry, will work with other mechanical and electrical industry common and sustainable development.

Pneumatic punch is made of what material

December 26th, 2016

Pneumatic punch is made of what material Shenzhen IPM pneumatic punch Introduction: In this case, Pneumatic Press – Highly sensitive and reliable clutch / brake device and the international top double solenoid valve, overload protection device to ensure the accuracy and safety of the press slide and stop Pneumatic punch – high steel frame design, the use of high-quality steel welding system Beam Sawing Machine, through the elimination of internal stress process. Improve the stability of the whole accuracy and reliability Pneumatic punch – the machine uses high-alloy steel Drilling Machine for Plate, double crankshaft, two wide work center, away from the connecting rod support structure, optimal design.

Pneumatic punch – In order to ensure the relative stability of the machine operation, the use of symmetrical two slider, balancer device design Pneumatic punch – adjustment precision up to 0.1mm, safe, convenient and reliable Pneumatic punch – crankshaft, gears, connecting rod and other components, the hard oxidation and grinding process, with a high overall performance and tolerance type Pneumatic punch – machine structure design is reasonable, easy to automate production, reduce costs and improve efficiency Pneumatic punch – advanced design concepts CNC movable drilling machine, low noise, low consumption, energy saving The above is the introduction of pneumatic punch performance and design, learn more pneumatic punch in:

Pneumatic Press how to demolish the film Pneumatic punching

December 26th, 2016

Pneumatic Press how to demolish the film Pneumatic punching is the demolition of the punching operation of the scale to guide the production of reasonable manipulation and maintenance to ensure product quality milling machine for sale. Demolition of the membrane range: Quality Department: responsible for quality maintenance standards and production control of the control. Technology Department: responsible for the production process control file production control of the production control. Production Department: responsible for the manipulation of documents and equipment by the daily maintenance and maintenance.

Check the mold to confirm whether there is no Pass label, mold model selection is accurate, the mold is clean and clean. Check whether the accuracy of mold material, whether the process card and material match, incoming material size is consistent with the MI; Install the required mold according to the upper mold program sheet metal punching machine. Boot in strict accordance with the boot security program boot. Modulation according to the transfer process, according to the requirements of security mode. Try to use the same size to be washed with the same punching paper test punch, check whether the burr or missing charge punch, and then according to the thickness of punching plate to adjust the depth of concave and convex mold bite to be able to clean cutting Angle Steel Cutting Machine.

Precision punching factory where – professional manufacturers punch manufacturers

December 9th, 2016

Precision punching machine is usually used high-grade, high-strength cast iron and to stress-tempering and natural aging treatment, so to ensure that its small deformation coefficient of high rigidity, precision and stability, precision punching is generally suitable for stamping thickness of thin and high precision products; If the punching accuracy is not high but the thickness is relatively thin with a high-speed presses can also greatly improve production efficiency. Precision presses are widely used in precision electronic, communications, computers, household appliances, auto parts, motor rotor and other small precision parts of the stamping process. To prevent contamination of the oil to ensure clean oil is to protect the hydraulic system is the key to normal work.

According to the actual experience CNC marking line, the hydraulic system has 80 percent of the problems caused by oil pollution, oil pollution will accelerate the loss of hydraulic components cnc plate drilling machine. Regular cleaning, fastening, filtration and replacement system. Hydraulic equipment during operation, because of shock vibration, loss and pollution, etc., will cause the tube loose, metal parts and seals loss, it is necessary for the hydraulic components and fuel tanks, such as regular cleaning and repair of oil boring machine for sale, seals To do a regular replacement. Precision punches prevent leaks in the hydraulic system because leakage and suction are common faults in hydraulic systems. To prevent leakage, the key is to do a good job of the three points, the first point is to improve the accuracy of hydraulic components and components of the assembly quality and installation of pipeline system quality. The second point is to improve the quality of seals, pay attention to the installation and replacement of seals on a regular basis, the third point is to strengthen the daily management and maintenance.