Horizontal injection molding machine maintenance: The injection screw, check ring and barrel form the heart of the injection molding machine, which determines the quality and efficiency of the processing, and they must be kept in good working condition. First of all, the imported horizontal injection molding machine should take necessary measures to prevent non-plastic debris from mixing into the plastic material flow, and then pay attention to checking the correct gap between the screw and the barrel, and the check ring and the barrel. The normal gap should be able to seal Hold the plastic backflow and produce the shearing effect required for plasticization. When it is found that the melt is slow, the melt has spots and black spots, or the product is unstable, check the wear of the screw, check ring and barrel.

The causes and solutions of some common failures of imported second-hand injection molding machines: The production of imported second-hand injection molding machines is unstable or unqualified. In a stable production cycle, the quality of finished products is unstable, which may be caused by mechanical parts wear 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 force and speed control part is abnormal.

Noise production of imported horizontal injection molding machine

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 clogging 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 generate 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, so it needs to be replaced with a suitable 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, which will also cause noise. The solution is to clean the spool. If the spool 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 a high speed.

6. The mechanical part is faulty, the bearing is worn or the machine lacks lubricating oil or the parts are loose. The reason should be found out and the parts should be tightened or replaced.

The horizontal injection molding machine guarantees sufficient lubricating oil:

The abnormal rise of oil temperature caused by excessively high oil temperature may be caused by abnormal cooling system or high heat generated by hydraulic 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, etc.

2) The pipeline is blocked, such as the filter screen, the cooling tower or the 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.