Lower mould assembly for plastic bottle cover mould pressing machine

Abstract

The present invention discloses a counterdie assembly used for plastic cap molding press comprising a hydraulic cylinder vertically fixed under a fixing hole equipped on a dial fixing plate; the piston rod of the hydraulic cylinder is equipped upwards and the upper end of the piston rod is foxed with a lower cavity block; the piston rod is a hollow pipe; a cooling external pipe is penetrated through the hydraulic cylinder from the bottom and fixed with the piston rod; a cooling internal pipe is inserted into the cooling external pipe and the cooling internal pipe is communicated with the cooling external pipe by a cooling cavity equipped in the cavity block. With the technical proposal, direct cooling can be implemented on the bottom of an upper cavity block with the cooling medium, which promotes the mold cooling speed and production efficiency and ensures the product quality.

Description

Technical field [0001] The invention belongs to the field of plastic bottle cap compression molding equipment, and particularly relates to a lower mold assembly for a plastic bottle cap molding press. Background technique [0002] The patent document No. 01274089.6 discloses a plastic bottle cap molding press, the molding part of which uses an annular cam to push the roller ejector rod and the upper and lower die heads connected to it to complete the mold clamping, compression molding and demolding discharge. In the compression molding bottle cap, the mold cooling position and cooling time are very important. There are two areas that need to be cooled during the molding process. One is the inner wall formed by the inner thread of the cap (the upper punch). Ensure that there is no deformation and strain during demolding. The other is the top of the bottle cap (ie the bottom of the lower die), which has the longest and most heated time. Insufficient cooling will cause deformation a...

AI Technical Summary

Problems solved by technology

In compression molding bottle caps, the cooling part and cooling time of the mold are very important. There are two parts that need to be cooled during the molding process. One is the inner wall formed by the internal thread of the bottle cap (that is, the upper punch), and Ensure that there is no deformation and strain during demoulding. The other place is the top of the bottle cap (that is, the bottom of the lower die). Because the lower die of the plastic bottle cap molding machine is directly connected and fixed on the roller mandrel, it can only cool the outer wall of the formed bottle cap (that is, the cooling around the molding cavity of the lower die) and cannot cool the bottom of the lower die. Direct cooling prolongs the cooling time and affects the quality and production efficiency of compression molded products

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