A nitrogen nozzle assembly used in gas-assisted molds

Abstract

The invention provides a nitrogen spray nozzle assembly for a gas-assisted mold. The gas-assisted mold is internally provided with a mold insert for containing the nitrogen spray nozzle assembly; thenitrogen spray nozzle assembly is arranged in the mold insert and comprises a gas pin core sleeve and a gas pin core; the gas pin core sleeve is embedded in an installing part of the mold insert, a wall surface defined by the outer surface of the gas pin core sleeve is matched with an inner wall surface of the installing part, and containing space is limited in the inner part of the gas pin core sleeve; the gas pin core is fixedly arranged in the containing space and has a gas passage communicated with a gas passage and a flow passage; the gas passage is used for introducing gas from the exterior; the flow passage is a flowing passage after the gas enter a cavity in the gas-assisted mold; the gas passage has a gas inlet end connected with the gas passage and a gas outlet end connected withthe flow passage; one side of the gas outlet end of the gas pin core excesses a surface where the mold insert is located, at one side of the gas outlet end by a first preset length. According to thenitrogen spray nozzle assembly provided by the invention, the sealing performance of a nitrogen spray nozzle during a working process is ensured, the nitrogen spray nozzle is convenient to disassemble, assemble and maintain on the gas-assisted mold, and a sealing ring in the nitrogen spray nozzle is enabled not to be damaged.

Description

Technical field [0001] The invention relates to the technical field of gas-assisted molding, in particular to a nitrogen nozzle assembly used in a gas-assisted mold. Background technique [0002] Gas-assisted molding has more and more application trends recently. Gas-assisted molding (GIM) refers to the injection of high-pressure inert gas when the plastic is properly filled into the cavity (90% to 99%), and the gas pushes the molten plastic to continue to fill the cavity, using gas pressure to replace the plastic pressure holding process An emerging injection molding technology. The mold usually used in gas-assisted molding is gas-assisted mold. In the gas-assisted molding process, gas has two functions: one is to drive the flow of plastic to continue filling the cavity; the other is to form a hollow pipe, reduce the amount of plastic, reduce the weight of the finished product, shorten the cooling time and more effectively transfer the holding pressure . In general gas-assis...

AI Technical Summary

Problems solved by technology

[0003] The nitrogen nozzles in the prior art are generally installed by thread fastening, which may have the problems of insufficient machining accuracy of the holes and insufficient verticality of the thread during tapping, and then cause air leakage after the nitrogen nozzle is installed

What's more, the nitrogen nozzle in the prior art will not be installed or stuck after installation during the installation process, which is not convenient for the replacement and maintenance of the nitrogen nozzle in the later stage

Moreover, when the nitrogen nozzle is installed in the prior art, the sealing ring on the nitrogen nozzle will always be broken, so that it cannot produce practical effect in the subsequent use process

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