Injection mechanism of injection molding machine

Abstract

The invention relates to the field of injection molding machines, in particular to an injection mechanism of an injection molding machine. The injection mechanism comprises an injection cylinder, an injection charging barrel, a pre-injection charging barrel and a nozzle, wherein an injection plunger is connected with the injection cylinder; one end of the pre-injection charging barrel is connected with the injection charging barrel; the injection mechanism further comprises a nozzle transition body and a nozzle cylinder; the upper part of one end of the nozzle transition body is connected with the pre-injection charging barrel, and the lower part of the other end of the nozzle transition body is connected with the nozzle; an inclined channel is formed in the nozzle transition body; the two ends of the inclined channel are respectively communicated with the pre-injection charging barrel and the nozzle; a nozzle plunger is arranged in the nozzle cylinder; the nozzle plunger is axially connected with a nozzle valve core; the nozzle valve core is arranged in the nozzle. The injection mechanism of the injection molding machine improves the sealing performance between the nozzle and a die cavity, effectively prevents backflow and material escape, and has a compact structure.

Description

technical field [0001] The invention relates to the field of injection molding machines, in particular to an injection mechanism of an injection molding machine. Background technique [0002] Plastic products are usually injection molded by an extruder or an injection molding machine and formed in a mold. The injection molding machine in the prior art generally includes an injection cylinder, an injection barrel, a pre-shot barrel and a nozzle. The nozzle is axially connected to the pre-shot barrel, and the nozzle is often provided with a valve for controlling its opening and closing. During injection molding, the injection barrel and pre-shooting barrel are filled with molten plastic, the nozzle is opened, and the material is pushed forward by the injection cylinder to complete the injection molding. [0003] However, after the injection is completed, since the material inside the mold shrinks due to cooling, it needs to be fed through the nozzle. During the feeding pr...

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Problems solved by technology

[0003] However, after the injection is completed, since the material inside the mold shrinks due to cooling, it needs to be fed through the nozzle. During the feeding process, the pressure of the material flowing back from the mold cavity is very high. The sealing pressure between them is small, and it is difficult to overcome the pressure of the reflowing material, which is prone to reflow or material leakage, which affects the molding quality of plastic products.

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