(1) Injection system
Injection system function: injection system is one of the most important parts of injection molding machine, generally have plunger type, screw type, screw preplastic plunger injection type 3 main forms. At present the most widely used screw type. Its function is that, in a cycle of the plastic injection machine, a certain amount of plastic can be heated in a specified time after plasticizing, under a certain pressure and speed, the molten plastic is injected into the mold cavity through the screw. After injection, the molten material injected into the mold cavity is kept in shape.
Composition of the injection system: The injection system is composed 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 (the glue motor).
(2) Mold closing system
The function of the mold closing system: the function of the mold closing system is to ensure the mold closing, opening and ejecting products. At the same time, after the mold is closed, enough clamping force is provided to the mold to resist the pressure of the mold cavity caused by the molten plastic entering the mold cavity, so as to prevent the mold from opening and causing the bad situation of the product.
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The composition of the die closing system: The die closing system is mainly composed of the die closing device, the die adjusting machine, the ejector mechanism, the front and rear fixed template, the moving template, the die closing cylinder and the safety protection mechanism.
(3) Hydraulic system
The role of hydraulic transmission system is to realize the injection molding machine according to the various actions required by the process to provide power, and to meet the requirements of the injection molding machine parts required pressure, speed, temperature, etc. It is mainly composed of hydraulic components and hydraulic auxiliary components, wherein oil pump and motor are the power source of injection molding machine. Various valves control oil pressure and flow to meet the requirements of injection molding process.
(4) Electrical control system
Electrical control system and hydraulic system reasonable coordination, can achieve the injection machine process requirements (pressure, temperature, speed, time) and various procedures. Mainly by electrical appliances, electronic components, meters, heaters, sensors and other components. Generally there are four control methods, manual, semi-automatic, automatic, adjustment.
(5) Heating/cooling system
The heating system is used to heat the cylinder and the injection nozzle. The cylinder of the injection molding machine generally uses the electric heating ring as the heating device, which is installed on the outside of the cylinder and tested by thermocouple. Heat conduction through the cylinder wall provides heat source for plasticizing materials. The cooling system is mainly used to cool the oil temperature, the oil temperature is too high will cause a variety of failures, so the oil temperature must be controlled. The other place that needs to be cooled is near the feeding port of the feeding pipe to prevent the raw materials from melting, resulting in the normal feeding of raw materials.
(6) lubrication system
Lubrication system is the injection molding machine dynamic template, mold regulating device, connecting rod hinge and other parts of the relative motion to provide lubrication circuit, in order to reduce energy consumption and improve the life of parts, lubrication can be regular manual lubrication, can also be automatic electric lubrication;
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(7) Safety protection and monitoring system
The safety device of 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.
The monitoring system mainly monitors the oil temperature, material temperature, system overload, as well as the process and equipment failure of the injection molding machine, and gives instructions or alarms if abnormal conditions are found
The composition of injection molding machine
In terms of composition, the injection molding machine can be divided into feeding section, plasticizing section (also called compression section) and melting section (also called metering section or homogenizing section). According to the different lengths of each section, we can divide the screw into gradual type, mutant type and universal type, whose characteristics and application scope are shown in the following table.
In addition to the injection system, injection molding machine also has a closing system, hydraulic system, electrical control system, lubrication system, heating and cooling system, safety monitoring system.
