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How to eliminate the injection molding machine noise?

writer:LI SONG Share

With the development of the plastics industry, the use of injection molding machines is increasing. However, the noise problem of injection molding machines has always plagued producers and users. How to eliminate the noise of injection molding machine? The following LiSONG injection molding machine manufacturers will introduce to you from the following three aspects.

1. Causes and elimination of motor noise
the reason:
a.The motor bearing is damaged.
b.Motor coil winding failure.
c.The motor wiring is wrong, and the noise increases when the system pressure rises.
Troubleshooting method:
a.Replace the bearing.
b.Replace or repair the motor.
c. Refer to the wiring diagram again for wiring.

2、 Causes and elimination of vibration pump noise

Cause of failure:
a. The installation of oil pump motor is not concentric.
b. The coupling is loose.
c. Internal fault of oil pump.
d. If the oil level is too low, air will be sucked into the oil from the oil filter screen or connector connection.
e. Air is drawn in from the motor drive shaft.
f. The oil filter screen is blocked by oil pollution.
g. When the oil return pipe is loose, air is drawn in or the oil pipe is on the oil surface, and air is mixed into the oil.

Troubleshooting method:
a. The concentricity should be adjusted within 0.1 mm.
b. Fix the coupling.
c. Repair or replace the oil pump.
d. The increase of oil quantity is more than 400mm in the oil filter and joint position.
e. Replace the rotating shaft sealing ring.
f. Clean the oil filter and filter the oil.
g. Clean the oil filter and filter the oil.
8. Lock the oil return pipe and extend the oil return pipe under the oil level.

LS200PET Injection Molding Machine
3、 Causes and solutions of noise (relief valve) of total pressure valve

Cause of failure:
a. There is air in the front chamber of the pilot valve of the relief valve.
b. The damping hole on the main valve core of the relief valve is blocked by oil and dirt.
c. The pilot valve and valve seat are not tight.
d. The spring is deformed or installed incorrectly.
e. The oil flow at the remote control port is too large.
f. The viscosity of the hydraulic oil is too low or too high.
g. Resonates with the components in the circuit.

Troubleshooting method:
a. Strengthen the sealing, reverse the adjustment of pressure and exhaust several times.
b. Clean the valve body to make the damping hole unobstructed.
c. Repair or replace.
d. Repair and replace the spring.
e. Reduce remote control port flow.
f. Change the fluid.
g. The pressure setting of other components cannot be close to that of relief valve.

How to eliminate the noise of the injection molding machine will be shared with you today. In order to reduce the noise during the design, assembly and use of the injection molding machine, we actually search for the noise source and use a sound meter, oscilloscope, and spectrum analyzer to measure and analyze the sound. Pressure level; and carry out frequency analysis and comparison of different working conditions, so as to find the noise source, size and frequency characteristics, and take corresponding specific measures.

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