Routine faults and elimination of hydraulic sheet bending machine

Hydraulic plate bending machine is widely used, but the hydraulic system of hydraulic plate bending machine often appears rare faults, and users can not normal production. In fact, the troubleshooting method of hydraulic plate bending machine is very simple, the following is to introduce the hydraulic system of hydraulic plate bending machine routine fault and troubleshooting method.

1. Common faults

(1) The damping hole is blocked, and the system has no main pressure relief valve failure. Improper adjustment, spring broken, valve core conical seal is not good or valve core stuck. Clean, grind, adjust, repair or replace the relief valve. Solenoid directional valve is faulty, valve core stuck. Clean, grind or replace the slide valve.

(2) the slider does not act but can rely on the weight of the axial piston pump can not supply pressure oil: oil shortage; The motor failed to start after checking the start button. Ac contactors and thermal relays and motors; The plunger pump itself failure, inspection or replacement of the plunger pump.

(3) Main oil overflow valve failure. It may be that the damping hole is blocked and improperly adjusted, the spring is broken or the valve core is rusted and stuck. The relief valve needs to be adjusted, repaired or replaced.

(4) The slider is not parallel to tighten the handwheel of the air release valve, and the air in the balance cylinder. Fill with oil and remove air, then release the valve.

(5) Leakage of the vent valve, dismantle and check the seal of the vent valve cone, repair or replace the vent valve.

(6) the check valve has internal leakage, check the check valve cone seal, grinding cone sealing surface with line contact is better or replace the check valve.

(7) Balance cylinder piston rod head inclined iron fastening screw loose, check and firm piston rod head inclined iron firm screw.

2. Elimination steps/methods

(1) the slider can not go down the electromagnetic directional valve can not be reversed. Repair or replace the housing fixing screw loose. Check and tighten the circuit; Reversing valve core stuck. Clean, grind or replace the slide valve.

(2) one-way throttle valve core stuck or closed dead maintenance and cleaning.

(3) The sliding block can only be repaired or replaced to tighten the fixing screws of the shell. The solenoid directional valve cannot be reversed. Valve core stuck. Clean grinding or replace the slide valve; No action or loosening of shell fixing screws. Check the circuit.

(4) the valve core of the hydraulic control check valve is stuck. For maintenance, the liquid control check valve cannot be opened. Clean or replace.

(5) The spring may be loose. Tighten the hand wheel of pressure relay clockwise, the pressure relay is faulty. Press the spring.

(6) Piston cylinder piston seal ring wear seriously. Replace the sealing ring.

3. Precautions

(1) It may be that the shell fixing screw is loose or the valve core push rod is worn. Tighten the fixing screws on the bending machine housing. The return speed of the slider is slow and the pressure is high. The electromagnetic directional valve is faulty. Clean, repair xinhua bookstore push rod or replace the slide valve. The hydraulic control check valve is faulty, the valve core is stuck and the oil return is not smooth. Repair, clean or replace the liquid control check valve.

(2) Oil filling is removed. The downward speed of the slider is slow and the oil filling pressure is too high. Tighten the deflator handwheel. Adjust oil filling pressure again. Improper throttle valve adjustment or valve core stuck. Repair, cleaning and readjust the throttle valve opening.

(3) Adjust the oil filling pressure. Inclined iron fastening screw of piston rod head of synchronous cylinder is loose. Firm diagonal iron fastening screws. There is traction when the slider reaches the bottom dead point.