塑料注射机不论任何形式，均是由下主要装置组成：

Plastic injection molding machines, in any form, are made up of the main components:

① 注射装置。它的主要作用是使固态的塑料均匀地塑化成熔融状态，并以足够的压力和速度将熔料注入闭合的模腔中。它的主要部分有料筒，料筒加热器，料斗，计量装置，螺杆，螺杆的驱动装置，喷嘴及其驱动油缸等。

Injection device. Its main function is to make the solid plastic uniformly melt into a molten state and to melt the material into the closed mold cavity with sufficient pressure and speed. Its main parts are a cylinder, a barrel heater, a hopper, a metering device, a screw, a screw drive, a nozzle and a drive cylinder.

② 合模机构。它的主要作用是保证成型模具有可靠的开合动作。因为在注射过程中进入模腔中的熔料有较高的压力，这就要求合模装置给予模具以足够的夹紧力，即锁模力，防止模具在熔料的高压下推开。它的主要部件有机架，定动模板，拉杆，合模油缸及肘节等。

Clamping mechanism. Its main function is to ensure that the mold has a reliable opening and closing action. Because in the injection process, the melt into the mold cavity has higher pressure, which requires the mold to give the mold with sufficient clamping force, that is, clamping force, to prevent the mold in the melt under the high pressure to push. The main components of its fixed frame, a moving die rod, the clamping cylinder and toggle etc..

③ 顶出装置。它的作用是在开模到一定的距离后，驱动模具的顶出装置，将塑件从模具中顶出。

Ejector device. Its role is to open the mold to a certain distance, to drive the ejection device of the mold, the plastic parts from the mold out.

④ 机械和液压传动及电器控制系统。注射成型是个塑料塑化，模具闭合，压力，温度调节，注射入模，保压，制品固化定型，开模，顶出塑件等多道工序连续准确的生产过程，这些连续动作都是有机械和液压传动及电器控制的。

Mechanical and hydraulic transmission and electrical control system. Injection molding is a plastic mold closed, plasticizing, pressure, temperature regulation, injected into the mold, packing products, setting, mould, top production process of plastic parts and other processes continuously and accurately, the continuous action are mechanical and hydraulic transmission and electrical control.