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Analysis Of Seven Systems Of Injection Molding Machine

- Oct 26, 2018 -

Injection molding machine is one of the plastic machinery commonly used in plastic processing. The structure of plastic injection molding machine usually consists of injection system, clamping system, hydraulic transmission system, electrical control system, lubrication system, heating and cooling system, safety. Monitoring system and other components.


The role of the injection system injection system: the injection system is one of the most important components of the injection molding machine, generally has three main forms of plunger type, screw type, screw pre-plastic plunger injection type. Currently the most widely used is the screw type. The function is that, in a cycle of the injection molding machine, a certain amount of plastic can be plasticized and plasticized in a predetermined time, and the molten plastic is injected into the mold cavity through the screw at a certain pressure and speed. After the injection is completed, the melt injected into the cavity is kept set. Composition of the injection system: The injection system consists of a plasticizing device and a power transmission device. The plasticizing device of the screw type injection molding machine is mainly composed of a feeding device, a barrel, a screw, a glue assembly and a nozzle portion. The power transmission device includes an injection cylinder, an injection base moving cylinder, and a screw drive device (melt motor).

screw barrel

The function of the clamping system 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, the mold is supplied with sufficient clamping force to resist the cavity pressure generated by the molten plastic entering the cavity, preventing the mold from being slit, resulting in a bad condition of the product. The composition of the clamping system: the clamping system is mainly composed of a clamping device, a machine clamping, a mold adjustment mechanism, an ejection mechanism, a front and rear fixed template, a moving template, a clamping cylinder and a safety protection mechanism.

The function of the hydraulic system of the hydraulic system is to realize the power supply of the injection molding machine according to the various actions required by the process, and to meet the requirements of the pressure, speed and temperature required for each part of the injection molding machine. It is mainly composed of hydraulic components and hydraulic auxiliary components. The oil pump and 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.

The electrical control electrical control system and the hydraulic system are properly coordinated to achieve the process requirements (pressure, temperature, speed, time) and various program actions of the injection machine. Mainly composed of electrical appliances, electronic components, meters (see the bottom right), heaters, sensors and so on. There are generally four control modes, manual, semi-automatic, fully automatic, and adjustment.

The heating/cooling heating system is used to heat the barrel and the injection nozzle. The barrel of the injection molding machine generally uses a heating coil as a heating device, is installed outside the barrel, and is detected by a thermocouple. Heat is provided by the heat conduction of the tube wall to provide heat source for plasticizing the material; the cooling system is mainly used to cool the oil temperature. If the oil temperature is too high, various faults will occur, so the oil temperature must be controlled. Another location that needs to be cooled is near the feed opening of the feed pipe to prevent the raw material from melting at the feed opening, resulting in the raw material not being properly cut.

Lubrication system Lubrication system is the circuit of the injection molding machine's moving platen, mold adjustment device, connecting rod hinge, shooting table and other parts with relative motion to provide lubrication conditions, in order to reduce energy consumption and improve the life of parts, lubrication can be a regular manual Lubrication, or automatic electric lubrication;

Safety monitoring The safety devices of plastic mechanical injection molding machines are mainly used to protect people and machines. Mainly composed of safety door, safety baffle, hydraulic valve, limit switch, photoelectric detection components, etc., to achieve electrical-mechanical-hydraulic interlock protection. The monitoring system mainly monitors the oil temperature, material temperature, system overload, and process and equipment failure of the injection molding machine, and indicates abnormal conditions for indication or alarm.

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