Three-layer co-extrusion adjustable eccentric wire and cable extrusion machine head

Abstract

The invention provides a three-layer co-extrusion adjustable eccentric wire and cable extrusion machine head. The three-layer co-extrusion adjustable eccentric wire and cable extrusion machine head comprises a shell, an outer-layer divider, an outer-layer outlet die, a middle-layer divider, a middle-layer outlet die, an inner-layer divider, a mold core rod, a ball head, third eccentricity adjusting screws, a mold core, first eccentricity adjusting screws and second eccentricity adjusting screws. The outer-layer divider is assembled in the shell and is in taper fit with the shell to achieve locking. The outer-layer outlet die is assembled on the outer-layer divider through threads. The middle-layer divider is assembled in the outer-layer divider. The middle-layer outlet die is assembled on the middle-layer divider through threads. The inner-layer divider is assembled in the middle-layer divider. The mold core rod and the ball head are assembled in the inner-layer divider. The total number of the third eccentricity adjusting screws is four, and the third eccentricity adjusting screws are evenly distributed on the circumference of the inner-layer divider. The mold core is assembled on the ball head through threads. The first eccentricity adjusting screws are assembled on first eccentricity adjusting screw seats, and the first eccentricity adjusting screws directly abut against the outer diameter of a die sleeve seat. The total number of the second eccentricity adjusting screws is four, and the second eccentricity adjusting screws are evenly distributed on the circumference of the shell. The machine head can simultaneously extrude three layers and totally three kinds of different or same materials, and meanwhile the machine head supports independent adjustment of eccentricity of each layer in structure.

Description

technical field [0001] The invention relates to a three-layer co-extrusion adjustable eccentric wire and cable extruder head, which belongs to the technical field of wire and cable production. Background technique [0002] In the current field of high-voltage cable production, the structure of the high-voltage cable aluminum sheath is mostly a corrugated aluminum sheath. The machine head used for this type of sheath is a traditional double-layer machine head, that is, only two layers of material can be extruded at the same time, and For another high-voltage cable with a smooth aluminum sheath structure, it is generally necessary to add a layer of adhesion promoter on the outer surface of the aluminum sheath, mostly hot-melt adhesive material, and then cover the outer surface of the adhesion promoter with a plastic sheath layer and a semi-conductive cable. Layer, that is, the head needs to be able to extrude three layers of material at the same time and wrap it on the cable c...

AI Technical Summary

Problems solved by technology

[0002] In the current field of high-voltage cable production, the structure of the high-voltage cable aluminum sheath is mostly a corrugated aluminum sheath. The machine head used for this type of sheath is a traditional double-layer machine head, that is, only two layers of material can be extruded at the same time, and For another high-voltage cable with a smooth aluminum sheath structure, it is generally necessary to add a layer of adhesion promoter on the outer surface of the aluminum sheath, mostly hot-melt adhesive material, and then cover the outer surface of the adhesion promoter with a plastic sheath layer and a semi-conductive cable. Layer, that is, the head needs to be able to extrude three layers of material at the same time and wrap it on the cable core wire, while the traditional cable extrusion head can only achieve double-layer extrusion at the same time, and cannot achieve high-voltage cable hot melt adhesive-plastic sheath -Semiconductive three-layer one-time extrusion, in this case, the current compromise is to apply a layer of hot melt adhesive through other equipment before the core wire enters the machine head, because the coating equipment and process make the coating The covered hot melt adhesive layer cannot guarantee eccentricity and thickness uniformity, which seriously affects the quality of cable products

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