Device capable of heating sprue bush in plastic mold

Abstract

The invention relates to the field of plastic molds, and discloses a device capable of heating a sprue bush in a plastic mold. The device comprises the sprue bush, and an assembling part, a fixed partand a butt joint part are arranged on the sprue bush. The assembling part is sleeved with a mounting sleeve, and a heat preservation and insulation layer is arranged between the assembling part and the mounting sleeve. The outer surface of the mounting sleeve is a conical face, and a plurality of grooves are formed in the assembling prat. Heat exchange wires are laid in the grooves. The multiplegrooves are machined in the outer side of the assembling part, then the heat exchange wires are laid in the grooves, the heat exchange wires are powered on to generate heat to heat the assembling part, and therefore molten plastic materials flowing through the assembling part are kept at a high temperature and are kept at a proper temperature until the molten plastic materials enter a mold cavity;and the problems that a flow channel is blocked, and a product has glue missing, shrinkage, craze discoloring and other defects are avoided, the procedure of additionally correcting the product is omitted, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the field of plastic molds, in particular to a device capable of heating a sprue sleeve in a plastic mold. Background technique [0002] Plastic molds are often used in injection molding. The molten plastic parts are injected into the mold cavity under high pressure through the injection molding machine, and then cooled and solidified to finally obtain the finished product. In order to ensure the quality of the product, it is necessary to heat the plastic mold at the beginning of injection molding. , to avoid the cooling of the molten plastic material before it enters the mold cavity, resulting in the blockage of the flow channel and the scrapping of the product. After the molten plastic material enters the mold, the heat loss is mainly concentrated in the flow channel. The existing solution is to A volume cavity is set at the end of the channel, and the molten plastic material that first enters the flow channel and is cooled r...

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Problems solved by technology

[0004] In view of the above problems, the object of the present invention is to provide a device that can heat the sprue sleeve in a plastic mold, so as to solve the problem that the melted plastic material loses a lot of heat when it enters the mold cavity through the flow channel, and the temperature drops, resulting in easy flow of the flow channel. Problems such as lack of glue, shrinkage, and discoloration of silver streaks in the product in the cavity

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