JPS6048875B2 - Method for manufacturing cross-linked polyethylene power cable mold connections - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for making connections for crosslinked polyethylene power cable molds.

Generally, when manufacturing the molded connection part of a cross-linked polyethylene power cable (hereinafter referred to as CV cable), the internal semiconducting layer is formed by connecting the cable conductors with a conductor connection tube, and then applying a semiconducting layer to the outer periphery of the conductor connection tube. This was done by wrapping it in adhesive tape and then heat molding it. However, in the case of such a manufacturing method, not only is the work of winding the semiconductive tape troublesome, but also the internal semiconductive layer and the insulating layer formed on the outer periphery of the internal semiconductive layer are individually molded and heated to be integrally formed. Therefore, there are many molding processes,
There was a drawback that it required a lot of work man-hours and work time. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a CV cable connection part that can eliminate the above-mentioned drawbacks, reduce the number of working steps, and improve workability.

That is, the gist of the present invention is that the internal semiconducting layer has an i-th order (
The point is that it is manufactured by performing the steps a), (mouth), and fl→ in this order. (a) A semiconductive intermediate pre-molded unit having an inner shape that matches the outer circumferential shape of the conductor connecting tube, is formed into a substantially cylindrical shape, and has a torn part over the entire axial length, is (b) Before connecting both cable conductors, the cable is inserted into the vicinity of the ends of the cable pencil rings on both sides, and the part opposite to the cable pencil ring side is folded back. A step of returning the folded portions of the pair of semiconductive layer end pre-molded units, and overlapping a part of the folded portions on the end portions of the intermediate pre-molded unit, 11→ conductor connecting pipe and A semi-conductive intermediate pre-molded unit and a pair of semi-conductive end pre-J mold units are mounted on the periphery near the tips of the cable pencil rings on both sides, together with an insulating layer and an outer semi-conductive layer provided on the periphery thereof. The process of heating and molding the entire body.

An embodiment of the method for manufacturing a CV cable connection part of the present invention will be described below with reference to FIGS. 1 to 3.
The conductors of the CV cable 2 are connected with the conductor connecting tube 1, and then an inner semiconducting layer 3, an insulating layer 4, and an outer semiconducting layer 5 are sequentially formed on the outer periphery from the inside, and these are further heated. The basic structure is to form the entire body into a saw body using a heating mold.

Next, as shown in FIG.
.
It has a torn part along the entire length in the axial direction.

Each of the end pre-molded units 7 and 8 is formed such that one end thereof can be inserted into the tip of the cable pencil ring. It is formed so as to correspond to the inclined portion of the conductor connecting tube 1 toward the other end and to accommodate the intermediate pre-molded unit 6. Both the intermediate pre-molded unit 6 and the end pre-molded units 7, 8 are made of semi-conductive rubber or semi-conductive polyolefin material. Next, as shown in FIG. 3, when attaching the internal semiconducting layer 3 to the outer periphery of the conductor connecting tube 1 that connects the conductors of the CV cable 2 using the intermediate and end pre-molded units 6, 7, and 8, To explain the method, first, before connecting the conductors of the CV cables 2, 2, fit one end of the end pre-molded units 7, 8 into the tip of the cable pencil ring of each CV cable 2, respectively. , the other end is folded back and rolled up as shown in the figure. next,
Connect the conductor ends of the CV cables 2 and 2 with the conductor connecting tube 1, open the torn part of the intermediate pre-molded unit 6 from the side, and attach the intermediate pre-molded unit 6 to the outer periphery of the conductor connecting tube 1. Attach.

Then, the end pre-mold units 7 and 8 are each folded back in the direction of the arrow, the overlapped portion is returned to its original position, and the assembly of the internal semiconductive layer 3 is completed by overlapping it on the intermediate pre-mold unit 6. In this state, the heating mold After forming the insulating layer 4 and the external semiconducting layer 5 as described above, the whole is heated at once, and then the whole is molded and integrated. In this way, in the method of manufacturing the CV cable connection part of this embodiment, the internal semiconducting layer 3 and the insulating layer 4 are heated and molded at the same time instead of separately, so the number of times of molding can be reduced. For installation, since the intermediate and end pre-molded units with the above-mentioned special structure are used, there is no need for wrapping with tape as in the past, and the number of man-hours and construction time can be significantly reduced. Further, since the internal semiconducting layer is divided into Ξ parts, which are prepared in advance and then assembled, the workability can be improved. As described above, the method of manufacturing a CV cable connection portion of the present invention has the effect of significantly reducing the number of man-hours, work steps, and execution time, as well as improving workability.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a main part for explaining an embodiment of the method for manufacturing a CV cable connection part of the present invention, and Fig. 2 shows the pre-molded units of the internal semiconducting layer shown in Fig. 1 arranged in an assembled manner. The arrangement diagram and FIG. 3 are explanatory diagrams for assembling the internal semiconducting layer of FIG. 1. 1...Conductor connection tube, 2...CV cable, 3.
...Inner semiconducting layer, 4...Insulating layer, 5...Outer semiconducting layer, 6...Middle pre-mold unit, 7, 8...
・End pre-molded unit.

Claims (1)

[Scope of Claims] 1. A method for manufacturing a cross-linked polyethylene power cable connection part, in which both cable conductors are connected by a conductor connection tube, and then an inner semiconducting layer, an insulating layer, and an outer semiconducting layer are formed on the connection tube. , the above internal semiconducting layer has the following (a), (b)
A method for producing a crosslinked polyethylene power cable molded connection part, characterized in that it is produced by performing the steps of (c) in this order. (b) The semiconductive layer intermediate pre-molded unit, which is formed into a substantially cylindrical shape with an inner shape matching the outer peripheral shape of the conductor connecting pipe and has a torn portion over the entire axial length, is torn as described above. (b) Before connecting both cable conductors, the cable is inserted into the vicinity of the ends of the cable pencil rings on both sides, and the part opposite to the cable pencil ring side is folded back. a step of returning the folded-back portions of the pair of semiconductive end pre-molded units and overlapping a portion of the folded portions onto the ends of the intermediate pre-molded unit; (c) forming the conductor connecting tube; and a semi-conductive intermediate pre-molded unit and a pair of semi-conductive end pre-molded units mounted on the periphery near the tip of the cable pencil ring on both sides, an insulating layer provided on their periphery and an external semi-conductive A process in which the layers are heated together and the entire structure is integrated into a mold.