Modern hydraulic technology is closely combined with new technologies such as microelectronics, computer control technology and sensing technology, forming and developing into an automation technology including transmission, control and detection. At present, hydraulic technology has made great progress in realizing various requirements such as high pressure, high speed, high power, durability and high integration. There are also many new achievements in improving the development of proportional control, servo control and development control technology. At the same time, computer-aided design (CAD) and testing (CAT) of hydraulic components and hydraulic systems, microcomputer control, Hydromechatronics, Fluitronics, reliability, pollution control and energy consumption control are also the development and research directions of hydraulic technology.
1. Computer-aided design (CAD) and test (CAT) make full use of the existing hydraulic CAD design software, carry out secondary development and establish a knowledge base information system, which will form a closed-loop system of design-manufacturing-sales-use-design. By combining computer simulation with timely control, the characteristic parameters of the prototype can be modified by software before trial production to achieve the best design effect. The integrated computer manufacturing system (CIMS) is established by integrating CAD/CAM/CAPP/CAT and modern management systems, which makes a breakthrough in hydraulic design and manufacturing technology. Carry out fault prediction of hydraulic system and realize active maintenance technology. It is necessary to modernize the fault diagnosis of hydraulic system, strengthen the development and research of expert system, establish a complete expert knowledge base with learning function, and use the knowledge in computer and knowledge base to calculate the causes of faults, and put forward maintenance schemes and preventive measures. It is the direction of the hydraulic industry to further develop the general tool software of the hydraulic system fault diagnosis expert system and develop the self-compensation system of the hydraulic system, including self-adjustment and self-correction, and compensate before the fault occurs.
2. Mechatronics Mechatronics can realize the flexibility and intelligence of hydraulic system, and give full play to the advantages of hydraulic transmission, such as large output, small inertia and fast response. Its main development trend is: the hydraulic system will shift from the past electro-hydraulic development system and open-loop proportional control system to closed-loop proportional servo control system, and at the same time standardize sensors such as pressure, temperature and speed; Improve the performance of hydraulic components, which can better meet the needs of mechatronics in terms of performance, reliability and intelligence, and develop high-frequency and low-power electromagnetic electronic control components that directly interface with computers; The flow, pressure, temperature, oil pollution degree and other numerical values of the hydraulic system will realize automatic control measurement and diagnosis; Electronic direct control components will be widely used, such as electronically controlled hydraulic pump, which can realize various adjustment modes of hydraulic pump, soft start, reasonable power distribution and automatic protection. With the help of field bus, a high-level information system is realized, and the adjustment, dispute and maintenance of hydraulic system are simplified.
3. Reliability and performance stability are gradually improved. Reliability and performance stability are the most comprehensive indicators, including the reliability of components, devices, accessories, system reliability design, manufacturing and reliability maintenance. With the application of new materials, such as engineering plastics, composite materials, high-strength light alloys, and the emergence of new technologies and structures, the reliability of components and devices has been greatly increased. The maturity and popularization of system reliability design theory provide a theoretical basis for the reasonable selection of components. In addition, the perfection of filtration technology and the improvement of precision (the precision of filter can reach 1-3 μm, while the dynamic clearance of typical modern hydraulic components is ,5-5 μm) can not only completely remove solid impurities, but also separate gas and water in oil. The application of on-line real-time oil pollution detector and electronic alarm logic system makes the maintenance of hydraulic system develop from simple disassembly and repair in the past to active maintenance. The foreseeable factors are comprehensively analyzed, and the potential factors that cause faults are eliminated in advance to the maximum extent.
4. pollution control pollution control in the past, the hydraulic industry mainly focused on controlling the pollution of solid particles, but often did not pay enough attention to the pollution control of water and air. In the future, we should pay attention to solving the problems: strictly control the pollution in the production process, develop a closed system to prevent external pollutants from invading the system; The design of components and systems should be improved to make them have greater pollution resistance. At the same time, develop high-efficiency filter materials and filters with strong pollution resistance. Study on online measurement of pollution; Develop oil-water separation and purification devices and moisture removal components, as well as filter Yuanjiang and detection devices that can remove gas, moisture, chemicals and microorganisms from oil.
5. reduce loss and make full use of energy. there is always energy loss in the process of converting mechanical energy into pressure energy and vice versa. In order to reduce the energy loss, the following problems must be solved: reducing the internal pressure loss of components and systems to reduce the power loss; Reduce or eliminate the throttling loss of the system, and minimize the overflow of unsafe needs; Adopt static pressure technology and new sealing material to reduce friction loss; To improve the performance of hydraulic system, load sensing system, secondary regulation system and accumulator circuit are adopted. Leakage control Leakage control includes two aspects: preventing the liquid from leaking to the outside to cause environmental pollution and the external environment from harming the system. In the future, leak-free components and systems will be developed, such as integrated and compound components and systems, pipe-less connection, new sealed and leak-free pipe joints, motor oil pump combination devices and so on. No leakage will be one of the important directions of the world hydraulic industry in the future.
6. Enhance the adaptability to the environment and broaden the application scope. Although hydraulic transmission has many advantages, its application is restricted to some extent because of some unsatisfactory places such as heat, noise and working medium pollution. In the face of the growing awareness of environmental protection in the future, corresponding measures should be taken to gradually solve and improve the above problems.