JPS5817010B2 - Rubber Mataha Plastic Materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for connecting cables having insulation such as rubber or plastic.

Conventionally, as shown in FIG. 1, a method for connecting cables having rubber or plastic insulation of this kind is to connect the two conductor ends 2° 2' of cables 1 and 1' to be connected together using, for example, a sleeve 8. The cable cores 3, 3' with rubber or plastic insulation have been butt-compressed and the connected conductor ends 2, 2' and the outer sheaths 9, 9' in their vicinity have been removed. Insulating layer 1 is formed by rolling up unvulcanized (uncrosslinked) rubber or plastic tape containing a sulfurizing (crosslinking) agent, and vulcanizing or crosslinking this.
A device that forms 0 is known.

However, in order to form the insulating layer 10 in this method, a rubber or plastic tape is wound up by hand for a long time and then vulcanized or crosslinked. This requires skill and a great deal of labor, and in addition, impurities such as foreign matter and dust adhere to the rubber or plastic tape during the tape winding process, and there is a risk that these impurities will be mixed in between the tape winding layers. However, there were drawbacks such as the inability to obtain a predetermined electrical dielectric strength.

The object of the present invention is to provide a method for connecting rubber or plastic insulated cables which advantageously solves the aforementioned problems.

Next, the present invention will be explained in detail using illustrated examples.

To carry out this invention and connect rubber or plastic insulated cables, as shown in FIG. The cable core 3, 3' with rubber or plastic insulation and the conductor ends 2, 2' are exposed over their length.

Next, the ends 2 and 2' of both ends are inserted into both sides of a sleeve 8 made of conductive material such as copper, and the sleeve 8 is compressed by a compressor to connect both ends 2 and 2' of the conductor. 8. On the exposed parts of both conductor ends 2, 2' and on the cable cores 3, 3', there are two semi-cylindrical uncontained vulcanizing (crosslinking) agent-containing tubes divided into two in the radial direction of the cross section of the cable. A solid insulating layer component 5 made of a block 4 made of vulcanized (uncrosslinked) rubber or plastic is fitted, and a pair of mold halves 11 are further tightened with bolts and nuts to form the solid insulating layer component 5. It is hermetically covered by the mold 6.

Next, the solid insulating layer component 5 made of the two unvulcanized (uncrosslinked) rubber or plastic blocks 4 containing a vulcanizing (crosslinking) agent is heated by a heater 12 wrapped around the mold 6 or the like. Vulcanization (crosslinking) is promoted from the injection port 14 with a check valve 13 inside the mold 6.
A fluid compound 7 of unvulcanized (uncrosslinked) rubber or plastic containing an agent is press-fitted to promote the fusion of the interface parts of the two rubber or plastic blocks 4 that are likely to separate, and to remove minute particles in the joints. This also fills in any gaps to ensure that the entire connection is one piece.

In this way, after the connection portion mainly consisting of the solid insulating layer component 5 is sufficiently vulcanized (crosslinked) as one piece and the molding is completed, the mold 6 is removed to complete the cable connection.

When carrying out this invention, two vulcanized (crosslinked) solid insulating layer constituent members 5 of the form shown in the above-mentioned embodiments are used.
In addition to the blocks 4 made of agent-filled unvulcanized (uncrosslinked) rubber or plastic, there are a total of four blocks in which the cable cross section is divided into two in the radial and circumferential directions, as shown in Figure 3. furthermore, as shown in Fig. 4, a total of six rubber or plastic blocks divided into two in the radial direction of the cable cross section and three in the circumferential direction. Rubber or plastic blocks of any shape and number, such as 4 blocks, can be used.

According to the invention, both conductor ends 2, 2 connected to each other
' and the exposed cable cores 3, 3 in their vicinity
A solid insulating layer component 5 made of a plurality of blocks 4 made of unvulcanized (uncrosslinked) rubber or plastic containing a vulcanizing (crosslinking) agent is fitted onto the top of the solid insulating layer component 5, and then this is made airtight with a mold 6. In addition to promoting heat vulcanization (crosslinking) by covering the mold 6 with a vulcanizing (crosslinking) agent in parallel with this heat vulcanization (crosslinking) work, the fluidity of the unvulcanized (uncrosslinked) rubber or plastic is increased. The compound 7 is press-fitted to fuse together the plurality of rubber or plastic blocks 4 that are being vulcanized (cross-linked), and also fills minute gaps within the joint to integrate the entire joint. Unlike the conventional method of rolling up unvulcanized (uncrosslinked) rubber or plastic tape by hand, this method requires skill to create an insulating layer for cable connections that has excellent electrical dielectric strength and is free from impurities and voids. This has the effect that vulcanization (crosslinking) molding can be performed easily and quickly without any problems.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical cross-sectional side view showing a connection section of a rubber or plastic insulated cable constructed by a conventional connection method, and FIG. 2 is a schematic diagram showing a state in which a rubber or plastic insulated cable is connected by the method of the present invention. 3 and 4 are side views showing the appearance of a conveyance path showing an example of a solid insulating layer component made of unvulcanized (uncrosslinked) rubber or plastic blocks containing a plurality of vulcanizing (crosslinking) agents. It is. In the figure, 1 and 1' are cables, 2 and 2' are conductor ends, 3 and 3' are cable cores, 4 is a block made of unvulcanized (uncrosslinked) rubber or plastic containing a vulcanizing (crosslinking) agent, and 5
6 is a solid insulating layer component, 6 is a mold, 7 is a fluid compound of unvulcanized (uncrosslinked) rubber or plastic containing a vulcanizing (crosslinking) agent, 8 is a sleeve, 9 and 9' are outer sheaths,
10 is an insulating layer, 11 is a mold half, 12 is a heater, 13 is a check valve, and 14 is an injection port.

Claims (1)

[Claims] 1 Strip the cables 1, 1' to be connected and connect the exposed conductor ends 2, 2' to each other, and then connect the connected conductor ends 2, 2' and their vicinity. A solid insulation layer consisting of a plurality of unvulcanized (uncrosslinked) rubber or plastic blocks 4 containing a vulcanizing (crosslinking) agent is placed on the cable cores 3, 3' with rubber or plastic insulation exposed by step stripping. After the component 5 is fitted and the top thereof is airtightly covered with a mold 6, the solid insulating layer component 5 is heated, and an unvulcanized (crosslinking) agent containing a vulcanizing (crosslinking) agent is placed in the mold 6. A method for connecting rubber or plastic insulated cables, characterized by press-fitting a fluid compound 7 of rubber or plastic (uncrosslinked).