Flow dividing and squeezing molding device

Abstract

The invention discloses a flow dividing and squeezing molding device. The flow dividing and squeezing molding device comprises a restraining mold and a flow divider, the restraining mold is in a sleeve shape and is made of flexible materials, openings are formed in the two ends of the restraining mold, the flow divider is provided with a squeezing opening and at least two flow passages, one end of the restraining mold is connected with one end of the flow divider, the input ends of the at least two flow passages communicate with the squeezing opening, and the output ends of the at least two flow passages communicate with an opening in one end of the restraining mold and are uniformly distributed in the circumferential direction of the restraining mold. The squeezing and flow expansion uniformity of a melt in a forming cavity is improved through flow division; the viscosity distribution of the melt from the feeding end to the tail end of the restraining mold is more uniform; the pressure distribution of the melt from the feeding end to the tail end of the restraining mold is more uniform; the extruded melt is discharged through elastic deformation of the restraining mold, and closed and blocked gas is exhausted; and after the melt is squeezed by the restraining mold, the melt is hooped through rebounding of the restraining mold, so that bubbles in the melt are removed.

Description

Technical field [0001] The present invention relates to a squeezing molding apparatus, and more particularly to a diversion squeezing molding device. Background technique [0002] The cable insulation is an important constituent structure of the cable, especially in the field of high voltage cables, such as state grid high-voltage cables, seabed high-voltage cables, new energy vehicles for high-voltage cables; cable recovery connection, towards the tunnel of the conductor Material melt, insulating material fuse condensation molding is a cable insulating layer. The cable insulating layer is or approximately one cylinder (which is a ring plane is an annular surface), so the forming chamber in the constraint mold is a cylindrical type. [0003] In the existing squeeze forming process of the cable insulating layer, it is mainly a squeezing hole to interpose the cylindrical forming chamber, and the single-point squeeze will result in the flushing of the insulating material in the cyli...

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Problems solved by technology

[0003] In the existing extrusion molding process of the cable insulation layer, one extrusion hole is mainly connected to the cylindrical molding cavity. The single-point extrusion method leads to a relatively uniform flow of the insulating material melt in the cylindrical molding cavity. Poor, resulting in uneven distribution of melt viscosity, uneven pressure distribution, and the formed cable insulation layer is not homogeneous

[0004] In addition, during the process of melt extrusion, the stuffed gas in the molding cavity also generates a certain pressure. If the stuffed gas is not released, it will cause air bubbles and cavities inside the cable insulation layer, or there will be gaps in the molding cavity. Melt flow to

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