Anti-backflow device for injection mold

Abstract

The invention discloses an anti-backflow device for an injection mold, and relates to the technical field of molds. The device comprises a base, wherein a shell is fixed on one surface of the base, and a flow limiting device is fixed on the inner surface of the shell through a fixing rod; a heating device is fixed on the inner surface of the shell, and a conical hole is formed in one surface of the shell; an injection cavity is formed in one surface of the shell, one end of the conical hole communicates with the injection cavity, and the flow limiting device comprises a hollow rod; a telescopic rod is arranged on the inner surface of the hollow rod in a sliding fit mode, and a spring is fixed between the inner surface of the hollow rod and one end of the telescopic rod; and one end of thetelescopic rod is fixedly provided with a flow limiting block coordinated with the injection cavity. According to the anti-backflow device, the shell, the base and the flow limiting device are used ina cooperating mode, the functions that injection molding materials pass through the device by one-way pressure and an injection molding opening of the mold is reversely and automatically limited to prevent the backflow are achieved, the use is simple and convenient, the production quality of the mold is ensured, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of moulds, in particular to an anti-backflow device for injection molds. Background technique [0002] Injection mold is a kind of mold, a tool for producing plastic products, and a tool for giving plastic products a complete structure and precise dimensions. Injection molding is a processing method used in the mass production of certain complex-shaped parts. Specifically, it refers to injecting heated and melted plastic into a mold cavity under high pressure from an injection molding machine, and after cooling and solidifying, a molded product is obtained. [0003] In the production process of injection molds, the injection molding machine injects hot-melt injection plastic into the mold. After the pressure is maintained, the plunger or screw retreats, and the pressure in the cavity is released. At this time, the pressure of the molten material in the cavity will be higher than that in front of the gate. I...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an anti-backflow device for injection molds, which can automatically limit backflow by cooperating with a current limiting device in the casing, so as to solve the problem of judging whether the gate is frozen based on work experience in the existing injection mold production process , often delay the withdrawal time of injection nozzles, do not have high quality assurance, and also affect the production efficiency

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