Causes and solutions of injection machine

Causes and solutions of injection machine failures

1. The oil temperature is too high

The abnormal increase in oil temperature may be caused by abnormal cooling system or high heat generated by oil pressure components during operation.

1. The cooling system is abnormal
1) The supply of the cooling system is insufficient, such as the water switch is not fully opened, the water pressure is insufficient, or the flow of the water pump does not meet the requirements.
2) The pipeline is blocked, such as the filter screen, cooling tower or water pipe.
3) The cooling water temperature is too high, such as the cooling tower has insufficient heat dissipation capacity, or is damaged or the temperature is too high.

2. The hydraulic system generates high heat
1) The oil pump is damaged, and the internal parts are worn at high speed to generate high heat.
2) The pressure is not adjusted properly, and the hydraulic system has been under high pressure for a long time and overheated.
3) Internal leakage of hydraulic components, such as damage to the directional valve or damage to the sealing ring, causes heat to be generated when high-pressure oil flows through a small space.
2. Noise generation

Abnormal noise generation means that there are parts damaged or improperly adjusted, and the cause should be found out and repaired immediately according to the location of the noise.

1. Insufficient hydraulic oil in the oil tank, suction of air by the oil pump or obstruction of the oil filter will cause the oil pump to be short of oil, causing the air bubbles in the oil to discharge and hit the blades and produce noise.

The solution is to check the oil level to prevent air intake and Clean the oil filter.

2. The hydraulic oil has high viscosity and increases the flow resistance. It is necessary to replace the appropriate hydraulic oil.
3. As the bearings or blades of the oil pump or motor are damaged, the concentricity deviation of the coupling causes noise, and the concentricity must be adjusted or parts replaced.
4. The directional valve does not respond properly but its function is still there. For example, the valve core is worn out, internal leakage, burr blockage, inflexible movement, and the solenoid valve malfunctions due to insufficient current and will also produce noise. The solution is to clean the valve core. If the valve core is worn out, new parts must be replaced, and the current must be stable and sufficient.

5. The damage of hydraulic components or the blockage of the oil pipeline causes noise when the hydraulic oil flows at high speed.

6. The mechanical part is faulty, the bearing is worn or the injection molding machine lacks lubricating oil or the parts are loose. Find out the reason and tighten or replace the parts to ensure that there is enough lubricating oil.

3. Product production is unstable or unqualified
In a stable production cycle, the quality of the finished product is unstable, which may be caused by the wear of mechanical parts or improper adjustment.
1. Wear of screw, check ring and barrel.
2. The internal leakage of the sealing ring in the injection cylinder is damaged.
3. The temperature control of the heating cylinder is unstable.
4. The pressure and speed control are partly abnormal.

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