Loss of action Loss of action of hydraulic system actuators is a common symptom. The main performance is: can not start and end the action according to the set order; Unexpected movements occur; The motion is not smooth.
1) The action cannot start in the set order
The direct cause of such problems is mainly that the reversing valve does not open normally, and the possible influencing factors are:
The valve core of the reversing valve is stuck.
Reversing valve head rod bent.
The solenoid of the reversing valve is burned out.
The wire is loose.
The control relay failed, so that the electrical signal could not be transmitted normally. And other reasons in the circuit to interrupt the electrical signal.
Improper operation.
Some switches and buttons are not in the correct position and will cut off the control signal. For example, after the safety door of the injection molding machine is opened, the closed mold movement cannot be realized, because the control circuit of the closed mold movement of the safety door is cut off from the control oil circuit. The throttle valve and speed regulating valve in series in the circuit are stuck and cannot achieve normal operation, and the unexpected blockage (actuator) in any part of the oil channel can not be started normally.
Due to various reasons, the hydraulic power source can not be transferred from the discharge state to the working state, and can not normally promote the movement of the actuator.
Occasionally, when the load part fails, it is not possible to push it.
2) The action cannot be finished according to the set order
This kind of problem is generally caused by the reversing valve can not be closed in time, the possible reasons are:
The reversing valve is stuck and the spool cannot be reset.
The reversing valve spring is broken and the spool cannot be reset.
The electrical signal of the reversing valve fails to disappear in time (such as execution switch failure, time relay failure, intermediate relay failure, etc.).
3) Unexpected movements occur
This kind of problem is mainly caused by the fault of the reversing valve and the fault of the electrical signal.
The spool of the reversing valve is reversed. If the opening and closing position of the reversing valve of two digits is shifted, there will be a phenomenon of action without power.
Due to the fault of the circuit, the electromagnet got the wrong electrical signal, causing the misoperation.
