Quick-cooling extrusion blowing device of polypropylene combined cover for plastic infusion container

Abstract

The invention discloses a fast-cooling extrusion blowing device of a polypropylene combined cover for a plastic infusion container. The fast-cooling extrusion blowing device comprises a working table, and the top surface of the working table is fixedly connected with a lower box body. The push rod structure is arranged at the piston, the spring is arranged in the push rod structure, when the piston is pushed for extrusion blowing, if the air pressure is large and the piston resistance is large, the contraction degree of the spring can be increased, the piston pushing speed is reduced, and then the air extrusion speed is adjusted according to the air pressure, and the air extrusion air pressure is balanced; meanwhile, a cooling cover is arranged, a finished product can be rapidly cooled through the cooling cover, then demolding is conducted, the product is put into water for secondary cooling, and the situation that the finished product deforms before demolding can be avoided; and when the extrusion blowing assembly needs to be maintained subsequently, the extrusion blowing assembly can be taken out only by opening the upper box body, so that the extrusion blowing assembly is convenient to maintain.

Description

technical field [0001] The invention relates to the technical field of production of medical infusion containers, in particular to a squeezing and blowing device for a polypropylene combined cover for fast cooling plastic infusion containers. Background technique [0002] Infusion is to inject large doses of injection into the human body through intravenous drip. At present, plastic infusion bottles have gradually replaced traditional glass infusion bottles. Plastic infusion containers are low in cost and not easy to break. Made of acrylic, this cap is produced by extrusion blow molding, which is formed by blowing air into the blow mold to make the plastic fit on the inner wall of the mold cavity for cooling and solidification. A method of manufacturing hollow thermoplastic parts, but the current extrusion blowing equipment has the following defects in the production of caps: 1. In the extrusion blow molding of the cap of the infusion container, the air pressure reaching t...

AI Technical Summary

Problems solved by technology

1. In the extrusion blow molding of the bottle cap of the infusion container, the air pressure reaching the mold cavity will change. The more gas that is squeezed and blown, the greater the air pressure. However, the speed of the current extrusion blowing equipment is the same. Squeeze in, causing the air pressure in the mold to be too high, so that the wall thickness of the finished product is different, affecting the quality of the product;

2. After the finished product of the bottle cap is formed, it needs to be cooled. At present, it is directly demolded and put into cold water for rapid cooling and forming. However, it has not been cooled during demoulding, and the finished product is prone to deformation;

3. The extruded parts in the current bottle cap extrusion blow molding equipment are usually fixed in the equipment, which is difficult to disassemble and maintain, which increases the cost of follow-up maintenance

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