JPS6260415A - Extruding, molding and connecting method for cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cable extrusion mold connection method for insulating connection of a connection part of a crosslinked polyethylene insulated cable (hereinafter referred to as a Cv cable), and in particular, to This invention relates to an economical extrusion mold connection method for cables.

[Problems to be solved by the conventional technology and the invention] When constructing a long CV cable line of 154Kv to 500KV, it is necessary to have a connection that has the same reliability as the CV cable used there. As this connection part, a so-called extrusion mold connection part manufactured by extrusion molding a molten polyolefin material using an extruder and an extrusion mold is most suitable.

On the other hand, in the case of a long line, in order to reduce the induced voltage in the cable sheath, an insulated connection part in which the outer semiconducting layer of the cable sheath is cut off in the middle is required.

However, development of an insulating type connection part for this type of extrusion mold connection part has not yet begun, and the development thereof has been delayed.

[Means for solving the problems] The present invention has been made in view of the above points, and includes:
The object of the present invention is to provide a useful method for easily producing this type of extrusion molded connection with excellent reliability.

That is, the present invention inserts an annular edge cutting unit onto one of the cables before connecting the cable conductors,
After connecting the cable conductor, when cutting the cavity of the extrusion mold so as to cover the connection part of the cable conductor, the annular edge cutting unit is placed on the inner surface of the cavity, and then the annular edge cutting unit is placed inside the cavity. Insulating synthetic resin is extruded using an extruder.

[Example] The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 shows an embodiment of the cable extrusion mold connection method of the present invention. Before connecting the conductors of C cables 1 and 2, a , an edge cutting unit 6 made of an annular semiconductive rubber/plastic molded body 5 formed so as to be covered with an annular insulating rubber/plastic molded body 4 is inserted, and then the conductors of the CV cables 1 and 2 are inserted. are connected, and an internal semiconducting layer 7 is provided on the surface to which this conductor is connected. Then, the cavity 9 of the extrusion mold 8 is inserted into the cella 1 so as to cover the connecting portion of the Cv cables 1 and 2.
~do. Then, the annular edge cutting unit 6, which was previously inserted and placed on either one of the C■ cables 1 and 2, is placed on the inner surface]0 of the cavity 9.

After that, an extruder 11 connected to the extrusion mold 8 or provided integrally with the extrusion mold 8 is used to inject the insulating synthetic resin into the cavity 9 around the connecting portion 3 of the cables 1 and 2. 12 and connect the CV cables 1 and 2 by extrusion molding.

According to such a cable extrusion mold connection method, the outer semiconductive layer is cut in the middle, and an insulated connection part having reliability equivalent to that of a CV cable can be easily obtained.

Further, an annular semiconductive rubber/plastic molded body 5 integrally formed with an annular insulating rubber/plastic molded body 4
The material of the annular insulating rubber/plastic molded body 4 of the edge cutting unit 6 is the same as the material of the insulating rubber/plastic molded body 4 extruded around the connection portion of the CV cables 1 and 2. It fuses easily and well.

[Effects of the Invention] As explained above, in the cable extrusion mold connection method according to the present invention, the annular edge cutting unit 1 is inserted through one of the cables before connecting the cable conductors, and the cable After connecting the conductors, when setting the cavity of the extrusion mold so as to cover the connection part of the cable conductor, the annular edge cutting unit 1 is placed on the inner surface of the cavity, and then the extruder is inserted into the cavity. Since the insulating synthetic resin is extruded, the basic construction method of extrusion mold connection is not changed just by placing the edge cutting unit, and it is easy to work with.It has the same reliability as C cable, and can be used for external semi-conducting. An insulated connection part of a cable with a layer cut in the middle can be easily made 1q. Further, the insulating synthetic resin extruded around the edge cutting unit and the cable connection portion has excellent effects such as good fusion bonding.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of the cable extrusion mold connection method of the present invention, and FIG. 2 is a vertical cross-sectional view of edge cutting units 1 to 1 used in the present invention. 1.2...CV cable, 3...connection part, 4...
Annular insulating rubber/plastic molded body, 5... Annular semiconductive rubber/plastic molded body, 6... Edge cutting unit, 7... Internal semiconductive layer, 8... Extrusion mold, 9... Cavity, 10... Inner surface of cavity, 11... Extruder, 12... Insulating synthetic resin.

Claims (2)

[Claims] (1) Before connecting the cable conductors, insert an annular edge cutting unit onto one of the cables, and after connecting the cable conductors, set the cavity of the extrusion mold so as to cover the connection part of the cable conductor. An extrusion mold connection method for cables, characterized in that the annular edge cutting unit is placed on the inner surface of the cavity, and then an insulating synthetic resin is extruded into the cavity using an extruder. (2) As an edge cutting unit, a unit consisting of an annular semiconductive rubber/plastic molded body and an insulating rubber/plastic molded body formed to cover the conductive rubber/plastic molded body is used. A cable extrusion mold connection method according to claim 1.