Daily preventive maintenance of the hydraulic part of the injection molding machine

- 2021-07-12-

As a kind of plastic processing equipment, injection molding machine usually takes a long time to work. Therefore, how to effectively ensure the continuous and stable production of injection molding machine is a problem that is worthy of attention and efforts to solve. From the perspective of our professionals, On the premise of correct selection of injection molding machine model, regular preventive maintenance is an effective way to achieve this goal. Based on this, this chapter will now take the hydraulic system as an example to briefly talk about the preventive maintenance and maintenance of the hydraulic part of the injection molding machine.
Hydraulic oil volume
Insufficient oil will cause the oil temperature to rise easily, and the air will easily dissolve into the oil, which will affect the oil quality and the normal operation of the hydraulic system of plastic processing equipment. Insufficient oil is usually caused by oil leakage or loss during repairs. For this reason, check daily If there is any leakage, replace worn seals and tighten loose joints as soon as possible. After maintenance, check the oil volume of the fuel tank and replenish it in time.
Hydraulic oil temperature
The ideal working temperature of the hydraulic system should be between 45℃-50. The reason is that the hydraulic system is designed according to the selected pressure oil viscosity, but the viscosity will change with the low oil temperature, which will affect the working components in the system. , Such as oil cylinders, hydraulic valves, etc., reduce the control accuracy and response sensitivity, especially for precision injection machines. At the same time, if the temperature is too high, it will accelerate the aging of the seal and cause it to harden and crack; if the temperature is too low, the processing energy will be consumed and the operating speed will be reduced. Therefore, it is necessary to pay close attention to the working temperature of the hydraulic oil. There are many reasons for the high oil temperature, but most of them are due to the failure of the oil circuit or the failure of the cooling system.
Hydraulic oil quality
One of the important properties of hydraulic oil is its chemical stability, that is, oxidation stability. Oxidation is the main factor that determines the effective service life of hydraulic oil. The insoluble matter such as wood tar, sludge and carbon residue generated by oxidation will contaminate the hydraulic system, increase the wear of hydraulic components, reduce various gaps, block small holes, and cause plastic processing. The hydraulic system of the equipment is malfunctioning. The oxidation rate of hydraulic oil depends on many factors such as its own and working conditions, among which temperature is one of the main factors. Therefore, it is necessary to use suitable hydraulic oil and regularly check the oxidation degree of hydraulic oil (judged from the darker color of the oil itself) ), it is absolutely necessary to actively change the oil after a certain number of working hours.
Oil filter cleaning
The oil filter plays a role in cleaning the hydraulic oil, so the oil filter of the plastic processing equipment should be washed every three months to keep the oil suction pipe unblocked, and check whether the oil filter is damaged.
Cooler cleaning
The cooler of plastic processing equipment should be cleaned once a year, or washed according to whether its working capacity is reduced. Blockage or fouling inside the cooler will affect the cooling efficiency. The cooling water should be soft (mineral-free).
The above are the five aspects that need to be paid attention to in the daily preventive maintenance and maintenance of injection molding machines, which are commonly used plastic processing equipment. In order to effectively improve equipment productivity, ensure the quality of plastic finished products, and reduce unnecessary production costs, it is hoped that relevant personnel must pay high attention to the use and maintenance of various plastic processing equipment.