1. Four major maintenance items of injection molding machine

1) When checking the high-voltage components in the machine, the main power supply should not be turned on unless necessary.

2) When replacing the mold, it is impossible to let the cooling water flow into the control box.

3) Check whether the temperature in the control box is too high to affect the normal operation of the electronic board.

4) When replacing the relay, the specified voltage relay shall be used.

2 Maintenance of oil pressure system

1) The pressure temperature of the injection molding machine should be kept between 30-50 ℃. If the oil temperature exceeds 60 ℃, the following problems will occur: the pressure oil will deteriorate due to oxidation.

2) The reduction of pressure oil viscosity will lead to the damage of oil pump, oil leakage, pressure drop and the working efficiency of pressure relief oil switch. Accelerate the aging speed of oil seal.

3) Prevent cooling water from leaking into the oil cylinder, and pay special attention to check whether there is water leakage inside the oil cooler. Remove and clean the oil cooler every 6 months or so.

4) The injection molding machine must change the pressure oil every 3000-4000 hours of operation. When changing the pressure oil, do not mix the new oil with the old oil. At the same time, unscrew the oil screen in the oil cylinder for cleaning.

5) If the oil switch fails because the valve core is blocked by foreign objects, the valve core should be removed from the oil switch and cleaned with diesel or kerosene (or immersed in clean pressure oil for cleaning), and then compressed air should be used to remove foreign objects. Unless it is determined that the oil stopper is blocked by foreign objects, which causes the failure of the injection molding machine, it is not allowed to remove the oil stopper at will.

3 Maintenance of clamping part

1) The working life of the machine hinge of the clamping part is very long, but each moving part should be properly lubricated, otherwise the machine hinge will wear and reduce its life.

2) Keep four columbines clean.

3) Keep the sliding feet and rails of the movable formwork clean and lubricated.

4) Avoid clamping at or above the working pressure.

5) When adjusting the mold, do not use the super fast mold locking speed.

6) Control the clamping action travel position to the most appropriate position to reduce the impact on the machine during clamping.

4. Maintenance of glue injection part

1) Keep the guide rod of the shooting platform lubricated and clean.

2) Keep the surface of the shooting table clean and dry.

3) Except for plastics, pigments and additives, do not put anything into the hopper. If returning materials are used, the hopper magnetic rack must be added into the hopper to prevent metal fragments from entering the glue melting cylinder.

4) When the glue cartridge does not reach the preset temperature, it is not allowed to start the glue motor or use the reverse rope (loosening) action to avoid damaging the rotating system components.

5) Before using special plastics, consult the plastic manufacturer to determine which injection screw is suitable for this kind of plastic.

6) Use the methods provided by the plastic manufacturer to replace the plastic correctly and clean the glue cartridge.

7) Periodically check all parts of the shooting platform, tighten the loose parts, and ensure that the installation of the two glue injection cylinders is balanced, so as to avoid damage to the oil seal of the glue injection cylinder, resulting in oil leakage and wear of the oil cylinder pump core.

8) Regularly drain the lubricating grease of the oil pressure motor part of the beer bell assembly and replace it with new grease.

9) When the melt temperature is normal and the melt black spots or discoloration constantly appear, check whether the glue injection screw rubber ring and the glue injection meson are damaged.

The above is the introduction of the four major maintenance items of the injection molding machine. If you want to know more professional knowledge, you can consult professional books!