Hydraulic system hydraulic control system and hydraulic transmission system are two kinds of hydraulic control system and hydraulic transmission system is different is that: hydraulic control system requires hydraulic implementation of organizational movement can be accurately tracking random changes in the control signal. Hydraulic control system mostly closed-loop control system, so there is a system stability, response and accuracy needs. For this purpose, electro-hydraulic servo valves, servo expanders, sensors, high-cleanliness oil sources and corresponding line arrangements are required for the mechanical-hydraulic-electrical integration.
Hydraulic control system equipment, commissioning key are as follows:
1, the choice of high-precision filters, according to the electro-hydraulic servo valve on the plea of ​​filtration requirements, usually 5 ~ 10μm.
2, in order to ensure that the hydraulic control system in the work process has a very good purification function, it is best to add low-pressure self-cleaning loop. Hydraulic pump manufacturers
3, hydraulic control system used hydraulic cylinder should be low friction hydraulic cylinder, the device should be measured before the minimum initiating pressure, hydraulic cylinder as a basis for future inspection.
4, the tank wall material or paint should not become a source of oil pollution, hydraulic control system, the best selection of fuel tank information stainless steel.
5, hydraulic control system should be carefully excluded before the formal work of gas, otherwise the system's stability and stiffness have a greater impact.
6, tank and piping system through the usual pickling process such as processing, write low viscosity hydraulic oil or turbine oil, no-load circulation erosion. Cycle flushing should pay attention to the following points: a) before flushing the servo valve position of the equipment using short-circuit channel plate replacement; b) flushing process filter clogging faster, should be promptly checked and replaced; c) flushing process to obtain oil on time , With a pollution measuring instrument for the determination of pollution and record until the scouring stop; d) After flushing all the clean oil release, through the precision filter into the tank of qualified hydraulic oil.
7, electro-hydraulic servo valve equipment as close as possible to the implementation of hydraulic components, servo valves and implementing components as little as possible between the hose, these are in order to improve the system's frequency response.
8, electro-hydraulic servo valve is mechanical, hydraulic and electrical integration of precision products, equipment, debugging before the need to have the basic knowledge, except to read in detail, to understand the product samples and brochures. Please pay attention to the following points: a) Whether the type of servo valve of the equipment complies with the requirements of the plan and whether the information of the servo valve and static function test at the time of delivery is sufficient or not; b) Whether the type and technical data of the servo expander meet the requirements of the plan , The parameters can be scheduled with the servo valve used to match; c) Check the electro-hydraulic servo valve control coil connection, series, parallel or differential connection, which meet the plan request; d) reaction sensor Displacement, force, speed and other sensors) type and connection is not in line with the needs of the program, extra attention should be paid to the accuracy of the sensor, which directly affects the system control accuracy; e) check the oil pressure and stability is not in line with the plan request, If the system has an accumulator, check the inflation pressure.
9, the hydraulic control system should be carried out before the official commissioning system, according to the following points: a) zero adjustment, including servo valve zero and servo expander zero, in order to adjust the system zero, sometimes involved in the bias Voltage; b) static test system to determine the static relationship between the controlled parameters and the command signal to adjust a reasonable expansion multiple, usually larger expansion multiple static error is smaller, the control accuracy is higher, but briefly constitute a system instability; c) system The dynamic test, the choice of dynamic test equipment, usually to be measured system stability, frequency response and negligence, is not able to meet the planning requirements. System dynamic and static inspection records can be used as a basis for the future assessment of system performance. 10, Hydraulic control system should be punctual after the work of checking the following records of data: oil temperature, oil pressure, oil pollution levels; work stability, the implementation of the organization's zero bias situation, the implementation of components of the signal tracking.
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