Injection mold processing plant ——Sources and elimination methods of noise of injection molding machine

Sources and elimination methods of injection molding machine noise:

1、 Causes of vibration pump noise and troubleshooting methods

reason:

1. The oil pump motor is not installed concentrically.

2. The coupling is loose.

3. Oil pump internal failure.

4. The oil level is too low, and air is sucked into the oil from the oil filter screen or connector connection.

5. Draw air from the motor to the moving shaft.

6. Oil dirt blocks the oil filter screen.

7. The return pipe is loose and sucks air or the oil pipe is on the oil surface, and air is mixed into the oil.

Troubleshooting:

1. Concentricity shall be adjusted to within 0.1mm.

2. Correct the coupling.

3. Repair or replace the oil pump.

4. Increase the oil volume to more than 400mm at the oil filter and joint position.

5. Replace the rotating shaft seal ring.

6. Clean the oil filter screen and filter the oil.

7. Lock the oil return pipe and extend the oil return pipe below the oil level.

2、 Causes of motor noise and troubleshooting methods

reason:

1. The motor bearing is damaged.

2. Motor coil winding fault.

3. The motor wiring is wrong, and the noise increases when the system pressure rises.

Troubleshooting:

1. Replace the bearing.

2. Replace or repair the motor.

3. Re refer to the wiring diagram for wiring.

3、 Causes and troubleshooting of total pressure valve noise (overflow valve)

reason:

1. There is air in the front chamber of the pilot valve of the overflow valve.

2. The damping hole on the main valve core of the overflow valve is blocked by oil dirt.

3. The pilot valve does not fit with the valve seat.

4. The spring is deformed or installed incorrectly.

5. The oil flow at the remote control port is too large.

6. The hydraulic oil viscosity is too low or too high.

7. Resonance with elements in the circuit.

Troubleshooting:

1. Strengthen the sealing, reverse lift and adjust the pressure for several times to exhaust.

2. Clean the valve body to make the damping hole unobstructed.

3. Repair or replace.

4. Repair and replace the spring.

5. Reduce the flow of remote control ports.

6. Change the fluid.

7. The pressure setting of other components cannot be close to the pressure setting value of the overflow valve.