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1. Injection systemThe role of the injection system: the injection system is one of the most important components of the injection molding machine. There are 3 main forms of plastic plunger injection. The most widely used is the screw type. Its function is that in a cycle of the injection molding machine, after a certain amount of plastic can be heated and plasticized within a specified time, the molten plastic can be injected into the mold cavity through a screw under a certain pressure and speed. After the injection is completed, the shape of the molten material injected into the mold cavity is maintained.
The composition of the injection system: the injection system consists of a plasticizing device and a power transmission device.
The plasticizing device of screw injection molding machine is mainly composed of feeding device, barrel, screw and nozzle. The power transmission device includes the injection cylinder, the injection seat moving cylinder and the screw drive device (melting motor).
2. Clamping system
The function of the clamping system: The function of the clamping system is to ensure that the mold is closed, opened and ejected. At the same time, after the mold is closed, sufficient clamping force is provided to the mold to resist the cavity pressure generated by the molten plastic entering the mold cavity, so as to prevent the mold from opening and causing the bad status of the product.
The composition of the clamping system: the clamping system is mainly composed of a clamping device, a mold adjustment mechanism, an ejection mechanism, an upper and lower fixed template, a moving template, a clamping cylinder and a safety protection mechanism.
3. Hydraulic system
The function of the hydraulic transmission system is to provide power for the injection molding machine according to various actions required by the process, and to meet the pressure, speed, temperature and other requirements of each part of the injection molding machine. It is mainly composed of various hydraulic components and hydraulic auxiliary components, among which the oil pump and the motor are the power source of the injection molding machine. Various valves control oil pressure and flow to meet the requirements of the injection molding process.
4. Electrical control system
The electrical control system and the hydraulic system cooperate reasonably, which can realize the process requirements (pressure, temperature, speed, time) and various program actions of the injection machine. It is mainly composed of electrical appliances, electronic components, instruments, heaters, sensors, etc. There are generally four control methods, manual, semi-automatic, fully automatic, and adjustment.
5. Heating/cooling system
The heating system is used to heat the barrel and the injection nozzle. Generally, the barrel of the injection molding machine adopts an electric heating ring as a heating device, which is installed outside the barrel and is detected by thermocouples in sections. . Heat conduction through the cylinder wall provides heat source for material plasticization; the cooling system is mainly used to cool the oil temperature. Too high oil temperature will cause various failures, so the oil temperature must be controlled. Another location that needs to be cooled is near the feeding port of the feeding tube to prevent the raw material from melting at the feeding port, causing the raw material to not be fed normally.
6. Safety protection and monitoring system
The safety device of the injection molding machine is mainly used to protect the safety of people and machines. It is mainly composed of safety door, hydraulic valve, limit switch, photoelectric detection element, etc., to realize electrical-mechanical-hydraulic interlock protection.
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