Automatic zipper machines usually consist of injection systems, mold closing systems, hydraulic transmission systems, electrical control systems, belt feeding auxiliary systems, heating and cooling systems, safety monitoring systems, etc.

(1) Injection system

The function of injection system: The injection system is one of the most important components of injection molding machines, generally in three main forms: plunger type, screw type, and screw pre molded plunger injection type. The most widely used currently is the screw type. Its function is to heat and plasticize a certain amount of plastic within a specified time in a cycle of the injection molding machine, and inject the molten plastic into the mold cavity through a screw under a certain pressure and speed. After the injection is completed, maintain the shape of the molten material injected into the mold cavity.

Composition of injection system: The injection system consists of a plasticizing device and a power transmission device.

The plasticizing device of a screw injection molding machine mainly consists of a feeding device, a material barrel, a screw, and a nozzle. The power transmission device includes an injection cylinder, an injection seat moving cylinder, and a screw driving device (glue motor).

(2) Mold closing system

The function of the mold closing system: The function of the mold closing system is to ensure that the mold is closed, opened, and the product is ejected. At the same time, after the mold is closed, sufficient locking force is provided to the mold to resist the pressure generated by the molten plastic entering the mold cavity, preventing the mold from opening and causing poor quality of the product.

The composition of the mold closing system: The mold closing system mainly consists of a mold closing device, a mold adjusting mechanism, a ejection mechanism, upper and lower fixed templates, a moving template, a mold closing oil cylinder, and a safety protection mechanism.

(3) Hydraulic system

The function of the hydraulic transmission system is to provide power for various actions required by the process of the injection molding machine, and to meet the requirements of pressure, speed, temperature, etc. for each part of the injection molding machine. It is mainly composed of various hydraulic components and hydraulic auxiliary components, among which the oil pump and motor are the power sources of the injection molding machine. Various valves control the oil pressure and flow rate to meet the requirements of the injection molding process.