Common types and characteristics of injection molding machines

Common types and characteristics of injection molding machines -- Guangdong Siweike Technology Co., Ltd
August 07, 2020 editor in charge: Huang Yanzheng 1 0
Abstract: Injection molding machine is also called injection molding machine or injection molding machine, and it is also called beer machine in East Guangdong and Hong Kong. It is the main molding equipment for making various shapes of plastic products from thermoplastic or thermosetting materials using plastic molding molds. According to the arrangement of injection device and mold locking device, the injection molding machine can be divided into vertical, horizontal and vertical and horizontal composite types.
Structure and function of injection molding machine
Injection molding machine is usually composed of injection system, mold closing system, hydraulic transmission system, electrical control system, lubrication system, heating and cooling system, safety monitoring system, etc.
Injection molding unit of injection molding machine
Injection system
The injection system is one of the most important components of the injection molding machine, generally including:
1. Plunger type:
2. Screw type: screw type is the most widely used injection system. Its function is to inject molten plastic into the mold cavity through the screw under a certain pressure and speed after heating and plasticizing a certain amount of plastic within a specified time in a cycle of the injection molding machine.
Plasticizing device: The plasticizing device of the screw injection molding machine is mainly composed of the feeding device, the material barrel, the gluing component and the nozzle.
Power transmission device: the power transmission device of screw injection molding machine includes injection cylinder, injection base moving cylinder and screw drive device (melt motor).
3. Screw pre-plastic plunger injection type:
Composition of injection system: The injection system is composed of plasticizing device and power transmission device.
Mold closing system
Role of mold closing system: The role of mold closing system is to ensure that the mold is closed, opened and ejected. At the same time, after the mold is closed, sufficient mold locking force is supplied to the mold to resist the mold cavity pressure caused by molten plastic entering the mold cavity, and to prevent the mold from opening, resulting in bad properties of the product.
Composition of the mold closing system: the mold closing system is mainly composed of the mold closing device, the machine winch, the mold adjusting mechanism, the ejection mechanism, the front and rear fixed template, the moving template, the mold closing cylinder and the safety protection mechanism.
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 requirements of pressure, speed, temperature, etc. required by various parts of the injection molding machine. It is mainly composed of various liquid components and hydraulic auxiliary components, of which the oil pump and motor are the power sources of the injection molding machine. Various valves control the oil pressure and flow to meet the requirements of injection molding process.
electric control
The electrical control system and the hydraulic system can cooperate reasonably to realize the process requirements (pressure, temperature, speed, time) and various program actions of the injection machine.
heating system
The heating system of the injection molding machine is used to heat the material barrel and injection nozzle. The material barrel of the injection molding machine generally uses the electric heating coil as the heating device, which is installed outside the material barrel, and is detected by thermoelectric coupling in sections. Heat conduction through the cylinder wall provides heat source for material plasticization.
Cooling system
The cooling system is mainly used to cool the oil temperature. Too high oil temperature will cause various faults, so the oil temperature must be controlled; The other place to be cooled is near the blanking opening of the material pipe to prevent the raw material from melting at the blanking opening, resulting in the abnormal blanking of raw material.
lubrication system
The lubrication system is a circuit that provides lubrication conditions for the relative moving parts of the injection molding machine, such as the moving template, the mold adjusting device, the connecting rod hinge, and the shooting table, in order to reduce energy consumption and improve the service life of the parts. Lubrication can be regular manual lubrication or automatic electric lubrication.
safety monitoring
The safety device of injection molding machine is mainly used to protect human and machine safety. It is mainly composed of safety door, safety baffle, hydraulic valve, limit switch, photoelectric detection element, etc., to realize electrical-mechanical-hydraulic interlocking protection.
The monitoring system mainly monitors the oil temperature, material temperature, system overload and process and equipment faults of the injection molding machine, and indicates or gives an alarm in case of any abnormality.