Running out of control of the hydraulic system is a common symptom

Running out of control of the hydraulic system is a common symptom. The main performance is not in accordance with the set order of the starting and ending movements, unexpected movements and movements, such as uneven.

1. actions cannot start as ordered

The direct cause of this kind of problem is that the reversing valve is not normally opened, and the possible factors are as follows: (1) the valve core of the reversing valve is jammed. The bending of the top of the reversing valve. The reversing valve electromagnet burns out. Loosening of wires. Control relay failure, so that the electrical signals can not be transmitted normally, and other reasons for the circuit to interrupt the electrical signal. The improper operation. Some switches and buttons are not in the correct position and will cut off the control signals. For example, after the safety door of the injection machine is opened, the closed die movement can not be realized, because at this point the control circuit of the closed mould motion of the safety stopper is cut off from the control oil circuit. Some injection molding machine in the mold switch after the switch, other actions of the circuit will be cut off, at this time can not do other actions. The series throttle valve, control valve in the circuit of the death card, unable to realize the normal operation, the oil channel at any point in the execution of a blockage accident), will not start properly. The hydraulic power source for other reasons, not by the state to the working state of unloading relief, is not normal to promote the implementation of element movement. When the load part fails, it is unable to promote the emergence of the occasional.

2. actions can not be set to the order of the end

Such problems are generally due to the valve can not be closed in time caused by, may be due to: first, the valve is stuck, the valve can not reset the heart. The spring of the reversing valve is broken, and the valve core can not be reset. The electrical signal of the reversing valve can not disappear in time (such as switch fault, time relay fault, intermediate relay fault, etc.).

3. unexpected action

Such problems are mainly caused by reversing valve fault and electrical signal fault. The possible reasons are as follows: (1) the valve of the reversing valve is loaded against. If the two position of the valve opening and closing position of the top, and then there will be no electricity, there will be action. Because of the fault of the circuit, the electromagnet gets the wrong electrical signal, and it also causes misoperation. The valve internal wear, oil pressure can pass through the gap, into the hydraulic cylinder two chamber, if the hydraulic cylinder is a single piston rod, the piston on both sides of the stress area of A1 and A2 (A1>A2), but the two unequal cavity oil pressure is equal to (P1=P2), so the hydraulic piston the cylinder by a moving rod force, and towards the direction to move slowly, the situation as shown in figure 2-31.