High-voltage cable sheath extrusion technology, anti-sticking mold device and drying device

Abstract

The invention discloses a high-voltage cable sheath extrusion technology and a device. The technology comprises the following steps: a, blowing residual asphalt paint attached to the surface of the cable core; b, threading the cable core into a plastic extrusion mold core in a machine head of a plastic extrusion machine; and c, carrying out plastic extrusion on the sheath by the plastic extruding machine to enable the sheath to be formed on the surface of the cable core. According to the invention, before plastic extrusion, the residual asphalt paint on the surface of the cable core is dried so as to prevent the temperature reduction of the plastic extrusion mold core in the plastic extrusion process, and guarantee the normal extrusion of a non-metallic sheath, and consequently the quality of the non-metallic sheath is enhanced greatly.

Description

technical field [0001] The invention particularly relates to a high-voltage cable sheath extrusion process and its device. Background technique [0002] High-voltage cable core is a kind of power cable core, which is mostly used in the main road of power transmission. The components of the high-voltage cable core from the inside to the outside mainly include: conductor, insulation layer, inner sheath and outer sheath. In the high-voltage cable core structure using the aluminum sheath as the inner sheath and the non-metallic sheath as the outer sheath, a layer of anti-corrosion layer should be coated on the surface of the aluminum sheath when producing the outer sheath to prevent the cable core from being damaged during operation. After the outer sheath is damaged, the outside world will corrode the aluminum sleeve. When the anti-corrosion layer on the aluminum sleeve is coated with asphalt paint, a small amount of asphalt paint will drip on the extrusion mold core when it ...

AI Technical Summary

Problems solved by technology

When extruding at the same time, it is inevitable that the cable core is in contact with the inner wall of the extrusion mold core (that is, the mold is attached). Since the temperature of the aluminum sleeve before entering the extruder head is the same as the ambient temperature, it is about 150 degrees different from the extruded non-metallic sheath. ℃, and aluminum is a good conductor of heat. After the aluminum sleeve is in contact with the inner wall of the extrusion mold core, the heat of the extrusion mold core is quickly transferred to the aluminum, which makes the temperature of the extrusion mold core drop rapidly, resulting in a sudden drop in the temperature of the mold core.

The sudden drop in core temperature affects the extrusion of the non-metallic sheath, causing "cold glue" and causing the non-metallic sheath to be pulled through

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