The development of hydraulic system
Take the initiative to maintain - hydraulic system maintenance has been from the past simple fault repairing, development to failure prediction, which found the fault symptom, in advance for repair, remove the problems, to avoid the development of the malignant accident. - to implement active maintenance technology must strengthen hydraulic system fault diagnosis methods of research, at present, with experienced maintenance technicians palace feeling and experience, by see, hear, touch, such as judgment to find fault is not suitable for modern industry to develop in the direction of large-scale, continuous and modernization, must make modern hydraulic system fault diagnosis, strengthen the research of expert system, summarizes the expert's knowledge, establish a complete, which has the function of learning expert knowledge base, and the phenomenon of using a computer based on the input and knowledge in the knowledge base, to use reasoning methods of reasoning machine, calculated that lead to the cause of the failure, improve the maintenance plan and preventive measures. To further trigger the general tool software of the hydraulic system troubleshooting expert system, the rules for different hydraulic systems only need to be modified and added and reduced. - in addition, still should develop from the compensation system, hydraulic system including self-tuning, self-lubricating, self-tuning, before failure, compensation into the city, this is the direction of the hydraulic industry efforts.
Reduce energy consumption and make full use of energy - hydraulic technology in converting mechanical energy into pressure and inverse transform, has made great progress, but there has 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 the energy conversion process can be significantly improved. To reduce the loss of stress, the following questions must be addressed: Reduce the internal pressure loss of components and systems to reduce power loss. In improving element internal flow pressure loss, adopts integrated circuit and casting sprue, can reduce the pipeline damage, and can also reduce the spill. Reduce or eliminate the loss of throttling of the system, minimize the flow of non-safe needs, and avoid throttling the flow and pressure. Use static pressure technology, new sealing material, reduce friction loss. The development of small scale, light quantification, compound, extensive development of 3 general diameter, 4-size electromagnetic valve and low power solenoid valve. Improve the performance of hydraulic system, adopt load sensing system, secondary control system and adopt accumulator circuit. 6 for the maintenance of hydraulic system in time, prevent pollution affect system service life and reliability, must develop new pollution detection methods, on-line measurement of pollution, to adjust in time, do not allow the lag, so as to avoid losses due to the slow process
With the combination of electronic technology and hydraulic transmission technology, the traditional hydraulic transmission and control technology has increased the vitality and expanded the application field. Electromechanical integration can improve the work reliability, the realization of the hydraulic system flexibility, intelligence, change the low efficiency of hydraulic system, oil leakage, poor maintainability shortcomings, give full play to the hydraulic transmission output, less coherent and the advantages of fast response, the main development trend as follows: (1) the application of electric hydraulic servo ratio technology will be expanded. Hydraulic system of electric hydraulic pressure on the past - oE system and the proportions of the open loop control system to closed-loop servo system, in order to adapt to the development of pressure, flow, position, such as temperature, velocity and acceleration sensors should be standardized. Computer interfaces should also be unified and compatible. (2) the power consumption of the development and computer direct interface is 5mA, as well as the high-frequency electromagnetic valve (less than 3mS) for the pulse width modulation system. (3) the hydraulic system of oil flow, pressure, temperature, pollution and so on numerical will realize automatic measurement and diagnosis, due to the price of the computer is reduced, monitoring system, including centralized monitoring and automatic control system will be developed. (4) standardization of computer simulation, especially for high-precision, "advanced" systems. (5) directly controlled by electronic components will be widely used, such as electronic control hydraulic pump directly, using generalized control agencies are also need to discuss in the future, electromechanical integration and development of hydraulic products.
The hydraulic component was high-pressure, and the continuous working pressure reached 40Mpa, and the maximum pressure was 48Mpa. (2) diversification of the means of regulation and control; (3) further improve the performance of adjustment and improve the efficiency of power transmission system; (4) to develop a combination of mechanical, hydraulic and electric power transmission devices; (5) to develop efficient systems with energy efficiency and energy storage capacity; (6) further reducing noise; (7) apply hydraulic screw plug valve technology, compact structure and reduce oil leakage.
