The injection molding machine is divided into plunger injection molding machine and screw injection molding machine according to the plasticization method; according to the transmission mode of the machine, it can be divided into hydraulic type, mechanical type and hydraulic-mechanical (connecting rod) type; according to the operation mode, it can be divided into automatic, Semi-automatic and manual injection molding machines.

(1) Horizontal injection molding machine: This is the most common type. The clamping part and the injection part are on the same horizontal centerline, and the mold is opened in the horizontal direction. Its characteristics are: the body is short, easy to operate and maintain; the center of gravity of the machine is low, and the installation is relatively stable; after the product is ejected, it can be automatically dropped by gravity, which is easy to achieve fully automatic operation. At present, most injection molding machines on the market use this type.

(2) Vertical injection molding machine: the clamping part and the injection part are on the same vertical centerline, and the mold is opened in the vertical direction. Therefore, it occupies a small area, it is easy to place inserts, it is more convenient to load and unload the mold, and the material falling from the hopper can be plasticized more uniformly. However, after the product is ejected, it is not easy to fall down automatically, and it must be removed by hand, which is not easy to achieve automatic operation. Vertical injection molding machines are suitable for small injection molding machines. Generally, injection molding machines below 60 grams are used more, and large and medium-sized machines should not be used.

(3) Angle injection molding machine: its injection direction and mold interface are on the same plane, it is especially suitable for flat products that do not allow gate marks in the machining center part. It has a smaller footprint than a horizontal injection molding machine, but the inserts placed in the mold tend to fall off. This type of injection molding machine is suitable for small machines.

(4) Multi-mode rotary table injection molding machine: It is a special injection molding machine with a multi-station operation. Its characteristic is that the mold clamping device adopts a rotary table structure, and the mold rotates around the rotating shaft. This type of injection molding machine gives full play to the plasticizing ability of the injection device, which can shorten the production cycle and improve the production capacity of the machine. Therefore, it is especially suitable for large batches of plastics with long cooling and shaping time or requiring more auxiliary time for placing inserts. However, due to the large and complex clamping system, the clamping force of the clamping device is often small, so this injection molding machine is widely used in the production of plastic shoe soles and other products.

General injection molding machine includes injection device, mold clamping device, hydraulic system and electrical control system.

The basic requirements of injection molding are plasticizing, injection and molding. Plasticization is the premise to realize and ensure the quality of molded products, and in order to meet the requirements of molding, injection must ensure sufficient pressure and speed. At the same time, due to the high injection pressure, correspondingly high pressure is generated in the mold cavity, so there must be a sufficient clamping force. It can be seen that the injection device and the clamping device are the key components of the injection molding machine.

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