How is an injection molding machine constructed？
Although injection molding machines are divided into so many types, their compositions are actually similar, usually consisting of injection system, mold clamping system, hydraulic transmission system, electrical control system, lubrication system, heating and cooling system, safety monitoring system, etc. composition.
Injection system: It is divided into three main forms: plunger type, screw type, and screw pre-molded plunger injection type (I am not clear about this type, and I have not found suitable relevant information yet). Its function is to heat and plasticize a certain amount of plastic, and then inject the molten plastic into the mold cavity through the screw at a certain pressure and speed. After the injection is completed, the molten material injected into the mold cavity is maintained in shape.
Mold clamping system: The mold clamping system mainly consists of a movable platen, a fixed platen, a tie rod, a mold closing mechanism, a product ejection mechanism and a safety protection mechanism. Its function is to ensure that the molding mold can be started flexibly, accurately, quickly, reliably and safely. close. During injection, the plastic melt injected into the mold cavity by the injection system has a very high pressure, which requires the mold clamping system to generate sufficient clamping force (clamping force) to ensure that the mold cavity is tightly closed. The plastic melt will not overflow out of the mold cavity.
Hydraulic transmission system: This part is its power device, which is different. Its function is to provide power to the injection molding machine according to various actions required by the process, and to meet the pressure, speed, temperature, etc. requirements required by each part of the injection molding machine.
Electrical control system: reasonably coordinated with the hydraulic transmission system, it can realize the process requirements (pressure, temperature, speed, time) and various program actions of the injection molding machine.
Lubrication system: This part is a circuit that provides lubrication conditions for the injection molding machine's movable platen plate, mold adjustment device, connecting rod hinge, injection platform, etc., in order to reduce energy consumption and increase the life of parts. Lubrication can be done regularly Manual lubrication or automatic electric lubrication.
Heating and cooling system: The heating system is used to heat the barrel and injection nozzle. The heat is conducted through the barrel wall to provide a 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 discharge port of the material pipe to prevent the raw materials from melting at the discharge port and causing the raw materials to not be discharged normally. It is worth mentioning that the heating system part is actually the hot runner part of the hot runner mold.
Safety monitoring system: It is mainly a device used to protect the safety of people and machines. It is mainly composed of safety doors, safety baffles, hydraulic valves, limit switches, photoelectric detection components, etc., to achieve electrical-mechanical-hydraulic interlocking protection. The monitoring system mainly monitors the oil temperature, material temperature, system overload, and process and equipment failures of the injection molding machine, and provides instructions or alarms when abnormal conditions are found.
