Material backflow and shortage prevention pushing device for injection mold

Abstract

The invention discloses a material backflow and shortage prevention pushing device for an injection mold in the technical field of injection molds. The pushing device comprises a base body assembly, a material intercepting assembly and a surface brushing assembly, wherein a pushing cylinder is inserted into an inner cavity of a shell in a penetrating manner, the material intercepting assembly comprises a fixed pipe which is inserted into an inner cavity of the pushing cylinder in a penetrating manner, and the surface brushing assembly is arranged on one side of the material intercepting assembly. According to the pushing device, injection molding raw materials are guided into the pushing cylinder, a U-shaped rod is driven by a moving pumping rod to drive a pushing ring to feed the injection molding raw materials through a stretchable sleeve and a guiding-out pipe, a pulling rope is in a loosened state, the diameter of a rope sleeve is changed to make the rope sleeve tightly bound to the outer wall of the stretchable sleeve, and flowing of the injection molding raw materials is rapidly blocked, so that the raw materials at the material intercepting position are intercepted in a smoothly flowing manner, the problem of material shortage or material excess during material blocking is avoided, and the quality of injection molding products is improved; and meanwhile, the inner wall of the stretchable sleeve is treated regularly through the surface brushing assembly, so that the problem that the stretching and retracting performance of the stretchable sleeve is reduced due to dry and hard raw materials is avoided.

Description

technical field [0001] The invention relates to the technical field of injection molds, in particular to a propulsion device for preventing material backflow and lack of material for injection molds. Background technique [0002] Plastic molds are tools that are matched with plastic molding machines in the plastic processing industry to give plastic products a complete configuration and precise dimensions. Due to the variety of plastics and processing methods, and the structures of plastic molding machines and plastic products, the types and structures of plastic molds are also varied. A plastic mold is a tool for producing plastic products. It consists of several groups of parts, and this combination has a molding cavity. During injection molding, the mold is clamped on the injection molding machine, the molten plastic is injected into the molding cavity, and cooled and shaped in the cavity, then the upper and lower molds are separated, and the product is ejected from the ...

AI Technical Summary

Problems solved by technology

[0003] Before the production and molding of plastic parts, it is necessary to push the molten plastic raw materials into the injection mold through the injection machine. There will be raw material backflow during the use of the existing injection molds. The public patent number: CN112223647A, the name is an injection mold push In this patent, the material flow is blocked by the rotating baffle plate, but during the rotation of the material baffle plate, it will push the surrounding raw materials to move, resulting in deviations in the amount of raw materials introduced into injection molding, and the quality of injection molded parts will decline. or unqualified questions ， For this reason, we propose a propulsion device for preventing material backflow and lack of material for injection molds

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