A catenary type cross-linked cable production mold and production method

Abstract

The invention discloses a catenary-chain type cross-linked cable production die and a production method, and belongs to the technical field of wire and cable manufacturing. The die comprises a basic die body, and the interior of the basic die body is provided with a wire-bearing circular hole and an incoming wire tapered hole. The die also comprises a first inner die body and a second inner die body, wherein the inner die bodies are in an integrated structure. The first inner die body is disposed in the basic die body in a sleeved manner, and the second inner die body is disposed in the first inner die body in a sleeve manner. One end of the first inner die body and one end of the second inner die body are respectively provided with a first incoming wire hole and a second incoming wire hole, and the other ends of the first and second inner die bodies are respectively provided with a first bushing and a second bushing. The conical degree of the first incoming wire hole is consistent with the conical degree of the incoming wire tapered hole. The conical degree of the second incoming wire hole is consistent with the conical degree of the first incoming wire hole. The production method needs to produce different types of cable conductors, and enables the corresponding first inner die body to be inserted into the basic die body or enables the second inner die body to be inserted into the first inner die body. The die and method are quick and convenient in die replacement, improve the production efficiency, and achieve the continuous production of adjacent types of conductors.

Description

technical field [0001] The invention relates to a catenary type cross-linked cable production mold and a production method, belonging to the technical field of wire and cable manufacturing. Background technique [0002] At present, catenary medium and high voltage XLPE cables mostly use three-layer co-extrusion units, which can be continuously produced in large lengths. Because the extrusion mold is used in the three-layer co-extrusion head, and the conductors have many different specifications, when changing adjacent specifications, it is usually necessary to stop the machine first, clean the residual glue in the head, install the mold of this specification, and then re-align the machine. The head is heated up, and the whole stop and start process takes about 3 to 4 hours. The cross-linked polyethylene material in the screw and the machine head stays for more than 20 minutes, and pre-crosslinking may occur to produce old glue, which will cause the surface of the extruded co...

AI Technical Summary

Problems solved by technology

Because the extrusion mold is used in the three-layer co-extrusion head, and the conductors have many different specifications, when changing adjacent specifications, it is usually necessary to stop the machine first, clean the residual glue in the head, install the mold of this specification, and then re-align the machine. The head is heated up, and the whole stop and start process takes about 3 to 4 hours. The cross-linked polyethylene material in the screw and the machine head stays for more than 20 minutes, and pre-crosslinking may occur to produce old glue, which will cause the surface of the extruded core to appear. Granular scorched matter reduces the insulation performance and even causes insulation breakdown, seriously affecting the quality of the wire core; about 70 meters of wire is required during the shutdown process, and the thickness and eccentricity of each layer must be readjusted during the startup process, which increases the number of wires and raw materials The waste of water, electricity, nitrogen and other energy consumption is also increased in the process of shutting down and starting up, which seriously affects the production efficiency of the equipment, and the labor intensity of workers increases, resulting in high production costs for enterprises

When replacing conductors of adjacent specifications, there is also a method of replacing the split mold without stopping the machine. This method is simple to replace the mold and can realize rapid mold change without stopping the production. However, considering that cross-linked cables are generally produced in large lengths, the inner shielding extrusion process It may be resisted by other molds in the machine head for a long time, and the movement in the opposite direction may accumulate on the inner wall of the small mold, causing cracks or misalignment of the upper and lower or left and right molds, resulting in the phenomenon that the inner screen layer is not round or even disconnected, which may cause Affect the thickness, roundness and electrical insulation performance of the insulating layer

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