PFA shrinkage-prevention injection molding device

Abstract

The invention provides a PFA shrinkage-prevention injection molding device. The PFA shrinkage-prevention injection molding device mainly comprises an injection molding machine, a lower flange, side sealing heads, a telescopic shaft and an air cylinder. The injection molding machine is fixed to an upper opening of the a valve body through an injection molding head, and the lower flange is assembled on a lower opening of the valve body; the valve body is fixedly connected with a rack through the lower flange; the side sealing heads are used pairs, and transverse shafts stretching into the valve body are designed and are symmetrically assembled at the left opening end and the right opening end of the valve body; the telescopic shaft and the lower flange are coaxially assembled in a sliding manner; and one end of the telescopic shaft goes deep into the interior of the valve body, and the other end of the telescopic shaft is fixedly connected with the output end of the air cylinder. The PFA shrinkage-prevention injection molding device is mainly used for carrying out PFA injection molding on the valve body, and in the injection molding cooling process, shrinkage space of PFA raw materials can be occupied by the telescopic shaft jacked into the space; meanwhile, the telescopic shaft can ensure that before being completely cooled, the PFA raw materials in the valve body have positive pressure, and can be tightly attached to the inner wall of the valve body; and the injection molding effect is better.

Description

technical field [0001] The invention relates to the technical field of valve injection molding, in particular to a PFA shrink-proof injection molding device. [0002] Background technique [0003] PFA is also called tetrafluoroethylene, and its full name is perfluoroalkoxy vinyl ether copolymer. It is a copolymer of a small amount of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene. The melt adhesion is enhanced, the melt viscosity is reduced, and the performance is unchanged compared with PTFE. This kind of resin can be directly processed into products by ordinary thermoplastic molding methods. Long-term use temperature -80-260 degrees, excellent chemical corrosion resistance, corrosion resistance to all chemicals, lowest friction coefficient among plastics, and good electrical properties, its electrical insulation is not affected by temperature, there are Known as the "King of Plastics". [0004] PFA is often used as a lining when making valves, that i...

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Problems solved by technology

[0006] In view of the above problems, the present invention provides a PFA anti-shrinkage injection molding device that can effectively solve the problem of high shrinkage rate when PFA is injected into the valve body and ensure the production quality of the valve body.

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