3 The choice of back pressure form is required for the plant to meet the working requirements of the hydraulic system. The control road or the return oil circuit has a fixed back pressure. The back pressure can be established by setting the relief valve check valve and the orifice in the circuit. For the closed system of the speed, the back pressure valve in the heat exchange circuit should adopt the overflow valve to adjust the pressure and match the flow through the return line to the back pressure in the control circuit. The damping hole can be set and throttled. Loss to meet the pressure and flow required for control. The return pressure of the hydraulic system is low and the back pressure should be prioritized. For systems with large flow and flow rates, or systems with harsh operating environments and severe hydraulic oil contamination, the damping holes are easy to block, and the returning oil path should not use the damping holes to form the back pressure, but should use one-way 4; dumpling pressure system The development trend of electromechanical selection of hydraulic systems is that electromechanicalization should now selectively focus on certain hydraulic systems with high power and large technical complexity, research and development of electromechanical systems, such as aerospace. Hydraulic system for military mining and construction machinery.

The electromechanicalization of the hydraulic system can realize intelligent control through computer, automatic diagnosis and processing of system failure, through the pressure of the system working parameters, pressure flow velocity and temperature, and the damping of the system components. When the orifice is blocked, the differential pressure before and after the orifice is reduced. When the change exceeds the fixed value, the signal is input into the computer through the pressure sensor, and the treatment is analyzed. The selection of the high-power hydraulic system of the high-power system is characterized by high efficiency, low noise and vibration, and reliable operation. When selecting hydraulic components of high-power systems, the following points should be considered to use integrated hydraulic valves and valve block systems to simplify piping layout and improve system efficiency; variable speed systems with volumetric speed control are preferred, and constant power control is preferred. The variable axial piston pump can make full use of the engine power in the speed regulation range; the reversing valve reversing of the engineering machinery hydraulic system should be controlled by the hand 2 force decompression pilot valve for flexible layout and light operation. And can expand the speed range; 451 stream 1; Luotong's commutation control mode. The hydraulic control should be adopted, and the electromagnetic control should not be adopted to meet the thrust required for the commutation, and the hydraulic shock can be reduced; the high-quality and high-efficiency hydraulic components are selected.

6 The choice of the reversing valve slide valve function in the locking circuit is in the auxiliary hydraulic system of the coal shovel. The circuit of the roller quotient is adjusted to the following problem: 0 The reversing spool valve can adopt 51 difficulties. The hydraulic control check valve can not be closed immediately after controlling the pressure oil to be closed, which affects the positioning accuracy. 2 When the drum is lowered, the direction of action of the pressure oil is caused by the gravity direction of the drum, which may cause the drum to fall overspeed and generate vibration and rush. To solve the above problems, the reversing spool valve can be changed to type 1 or type, and a one-way throttle valve is provided between the cylinder piston chamber and the hydraulic control one-way valve.

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