注射装置的主要作用是将各种形态的塑料均匀融化，并以足够的压力和速度将一定量的熔体注射到模具的模腔内，当熔体充满型腔后，仍需保持一定的压力和作用时间，使其在合适压力作用下冷却定型。
The main function of the injection device is to melt all kinds of plastic evenly, and inject a certain amount of melt into the mold cavity with enough pressure and speed. When the melt fills the mold cavity, it still needs to maintain a certain pressure and action time, so that it can be cold and shaped under the appropriate pressure.
合模装置的作用是实现模具的闭合并锁紧，以保证注射时模具可靠地合紧，并完成模具的开启和脱出塑件的动作。
The function of the mold closing device is to realize the closing and locking of the mold, so as to ensure that the mold can be reliably closed during the injection, and to complete the opening of the mold and the movement of the plastic parts out.
液压传动系统和电气控制系统的作用是对注射机提供动力和实现控制，保证注射机按工艺过程的动作程序和预定的工艺参数（压力、温度、时间等）的要求准确有效地工作。
The function of the hydraulic drive system and the electrical control system is to provide power and realize control for the injection machine, so as to ensure that the injection machine can work accurately and effectively according to the action procedure of the process and the predetermined process parameters (pressure, temperature, time, etc.).