The hydraulic maintenance module uses the hydraulic locking method to control the inlet and outlet oil circuits and load oil circuits of the electro-hydraulic servo valve. The module has the following three functions:
1. Locking function
When the system is in normal condition, the hydraulic lock is in the conduction state, and the electro-hydraulic servo control system adjusts the static blade viewpoint or valve opening in time according to the regulator signal and load condition. When the static blade viewpoint or valve opening deviates greatly from the set value or is completely out of control due to ten reasons (a fault with a control element in the servo control system, or other disturbing elements), the solenoid valve Y1 is energized, so that the hydraulic lock is in a closed state, and the inlet and outlet oil circuit and load oil circuit of the power servo valve are blocked, and the static vane or valve is determined on the spot immediately. At this moment, the orientation of the controlled object will determine the position when the fault occurs, and the user can judge and deal with the problem.
2. Jog function
When the automatic control loop is in a certain condition, if the azimuth deviation between the static blade viewpoint and the valve opening is large, the electromagnetic conditioning system can be activated to correct the static blade viewpoint or valve opening by jogging. Even if the two solenoids of the solenoid valve Y2 are energized, the servo cylinder is controlled to move slowly to the left and right to reach the specified position (note: at this time, the static vane or valve is not controlled by the servo system), so that the static vane or valve will not completely lose control and can continue to maintain the system operation.
The electro-hydraulic servo-controlled oil circuit and the electromagnetic conditioning oil circuit are used in parallel. After the switching of the hydraulic lock, the two operating conditions will not disturb each other.
3. Replace other equipment in the system online
When there is a problem with some equipment (such as servo valves, etc.) in the electro-hydraulic servo control system, it can be replaced online without stopping the pump, so as to ensure the normal production of production.
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