1 . Injection molding machine before the operation, check the electrical control box if there is water, into the oil, if electrical damp, do not start. Maintenance personnel should blow dry the electrical parts before turning on the machine. 2 . Before the operation of the injection molding machine, check whether the power supply voltage is consistent, generally should not exceed ±6% . 3 . Check whether the emergency stop switch and front and rear safety door switches are normal. Verify that the rotation direction of the motor and the oil pump are the same. 4 . Check whether the cooling pipelines are unblocked for long distances, and pass cooling water to the oil cooler and the cooling water jacket at the end of the barrel. 5 . Before the operation of the injection molding machine, check whether there is lubricating oil in each movable part, and add enough lubricating oil. 6 . Turn on the electric heater to heat each section of the barrel. When the temperature of each section reaches the requirements, keep it warm for a period of time to stabilize the temperature of the machine. The holding time varies according to the requirements of different equipment and plastic materials. 7 . Add enough plastic to the hopper. According to the requirements of different plastics for injection molding, some raw materials are best to be dried first. 8 . It is necessary to cover the heat shield on the barrel, which can save energy and extend the life of the electric heating coil and current contactor .