Installation of hydraulic control system

　　The difference between hydraulic control system and hydraulic transmission system is that the former requires the movement of its hydraulic actuator to track the changes of random control signals with high accuracy. Hydraulic control systems are mostly closed-loop control systems, so there is a need for system stability, response and accuracy. To this end, mechanical-hydraulic-electrical integrated electro-hydraulic servo valves, servo amplifiers, sensors, high-cleanliness oil sources and corresponding pipeline arrangements are required. The main points of installation and debugging of hydraulic control system are as follows:

　　1) The material or paint of the inner wall of the fuel tank should not be a source of contamination of the oil. The material of the fuel tank of the hydraulic control system should preferably be stainless steel.

　　2) Using high-precision filters, according to the requirements of the electro-hydraulic servo valve for filtration accuracy, generally 5-10μm.

　　3) After the oil tank and piping system go through general pickling and other treatment processes, inject low-viscosity hydraulic oil or turbine oil for no-load cycle flushing. Pay attention to the following points during cyclic flushing: a) The position where the servo valve is installed before flushing should be replaced by a short-circuit channel plate; b) The filter is blocked quickly during the flushing process and should be checked and replaced in time; c) Oil samples are taken regularly during the flushing process. Use a pollution measuring instrument to conduct pollution measurement and record until the flushing is qualified; d) After the flushing is qualified, release all the cleaning oil, and inject qualified hydraulic oil into the oil tank through a precision filter.

　　4) In order to ensure that the hydraulic control system has a better purification function during operation, it is best to add a low-pressure self-circulating cleaning circuit.

　　5) The installation position of the electro-hydraulic servo valve is as close as possible to the hydraulic actuator, and there are as few hoses as possible between the servo valve and the actuator. These are all for improving the frequency response of the system.

　　6) Electro-hydraulic servo valve is a precision product integrating mechanical, hydraulic and electrical. You must have relevant basic knowledge before installation and commissioning, especially to read and understand product samples and instructions in detail. Pay attention to the following points: a) Whether the model of the installed servo valve conforms to the design requirements, whether the servo valve dynamic and static performance test data at the factory is complete; b) Whether the model and technical data of the servo amplifier meet the design requirements, it can be adjusted The parameters should match the servo valve used; c) Check the control coil connection mode of the electro-hydraulic servo valve, series, parallel or differential connection mode, which one meets the design requirements; d) Feedback sensor (such as displacement, force, Speed and other sensors) whether the model and connection mode meet the design requirements, pay special attention to the accuracy of the sensor, which directly affects the control accuracy of the system; e) Check whether the oil source pressure and stability meet the design requirements, if the system has an accumulator, Need to check the inflation pressure.

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