-Social demand is always the driving force of technological development. Reducing energy consumption, improving efficiency, adapting to environmental protection requirements, mechatronics and high reliability are the eternal goals of hydraulic pneumatic technology, and also the key to whether hydraulic pneumatic products can win in the market competition.
-Due to the wide application of high-tech achievements in hydraulic technology, such as automatic control technology, computer technology, microelectronics technology, friction and wear technology, reliability technology, new technology and new materials, the traditional technology has made new development, and the quality and level of hydraulic systems and components have also been improved to a certain extent. However, it is impossible for the hydraulic technology facing 2 1 century to make an amazing technological breakthrough. We should mainly rely on the improvement and expansion of the existing technology and constantly expand its application fields to meet the future requirements. Based on the opinions of experts at home and abroad, its main development trend will focus on the following aspects:
1. Reduce energy consumption and make full use of energy.
-Hydraulic technology has made great progress in converting mechanical energy into pressure energy and pressure energy into mechanical energy, but there has always been energy loss, mainly reflected in the volume loss and mechanical loss of the system. If all the pressure energy can be fully utilized, the efficiency of energy conversion process will be significantly improved. In order to reduce the loss of pressure energy, the following problems must be solved:
① Reduce internal pressure loss of components and systems to reduce power loss. The main performance is to improve the pressure loss of the internal flow channel of the component, and the use of integrated circuits and casting flow channels can reduce the pipeline loss and oil leakage loss.
(2) Reduce or eliminate the throttling loss of the system, minimize the overflow of unsafe needs, and avoid using the throttling system to adjust the flow and pressure.
③ Adopting static pressure technology and new sealing materials to reduce friction loss.
④ Develop miniaturization, light weight and compounding, and extensively develop 3-way and 4-way solenoid valves and low-power solenoid valves.
⑤ In order to improve the performance of hydraulic system, load sensing system, secondary regulation system and accumulator circuit are adopted.
⑥ In order to maintain the hydraulic system in time and prevent pollution from affecting the life and reliability of the system, it is necessary to develop new pollution detection methods, measure pollution online and adjust it in time, and it is not allowed to lag behind to avoid losses caused by untimely treatment.
2. Active maintenance
-The maintenance of hydraulic system has changed from simple troubleshooting to fault prediction, that is, when the first symptom of fault is found, it is repaired in advance to eliminate hidden dangers and avoid the development of equipment malignant accidents.
—— To realize active maintenance technology, we must strengthen the research on fault diagnosis methods of hydraulic system. At present, relying on the feeling and experience of experienced maintenance technicians to judge and find faults by looking, listening, touching and measuring is no longer suitable for the large-scale, continuous and modern development of modern industry. It is necessary to modernize the fault diagnosis of hydraulic system, strengthen the research of expert system, summarize the knowledge of experts and establish a complete expert knowledge base with learning function. According to the input phenomenon and knowledge in the knowledge base, the computer uses the existing reasoning method in the inference engine to calculate the cause of the fault, improve the maintenance scheme and preventive measures. In order to further trigger the general tool software of hydraulic system fault diagnosis expert system, only a few rules need to be modified or added for different hydraulic systems.
-In addition, it is the direction of the hydraulic industry to develop the self-compensation system of the hydraulic system, including self-adjustment, self-lubrication and self-correction, and compensate before faults occur.
3. Electromechanical integration
The combination of electronic technology and hydraulic transmission technology makes the traditional hydraulic communication and control technology more dynamic and expands its application field. Realizing mechatronics can improve the working reliability, realize the flexibility and intelligence of hydraulic system, change the shortcomings of low efficiency, oil leakage and poor maintainability of hydraulic system, and give full play to the advantages of large output, small continuity and fast response of hydraulic transmission. Its main development trends are as follows:
(1) The application of electro-hydraulic servo proportional technology will continue to expand. The hydraulic system will be transformed from electro-hydraulic on-oE system and open-loop proportional control system to closed-loop proportional servo system. In order to adapt to the above development, sensors such as pressure, flow, position, temperature, speed and acceleration should be standardized. Computer interfaces should also be unified and compatible.
(2) Develop solenoid valves with power consumption less than 5mA and high frequency solenoid valves (less than 3mS) for pulse width modulation system.
(3) Automatic measurement and diagnosis of flow, pressure, temperature and oil contamination of hydraulic system. Due to the decrease of computer price, monitoring system will be developed, including centralized monitoring and automatic adjustment system.
(4) Standardization of computer simulation, especially for high-precision and "advanced" systems.