JPH11111420A - Device for manufacturing connection part of power cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a connection part of which a conductor center is not deviated and in which uneven wall thickness of the insulator is prevented for an electric power cable comprising a large size conductor by arranging a connection cable to be connected in the vertical direction and coating the cable with an insulator composition and molding and cross-linking the insulator composition by a vertical type extrusion die and a die for cross-linking. SOLUTION: A connection cable 10 to be connected, which is a naked conductor of an electric power cable, is arranged in vertical direction to make the load direction due to the self weight of the conductor and the cable arranging direction coincided with each other. In such a condition, the necked connection part of the connection cable 10 to be connected is set in a vertical type extrusion die 20 and the conductor connection part is coated with an insulator composition extruded by an extruder 30. After the coating of the insulator is formed and an external semiconductor layer tube is put on the insulator coating, the resultant connection cable 10 is set in a vertical type cross-linking die while the cable 10 being arranged in the vertical direction. After that, the insulator composition is heated and molded to be cross-linked, so that the connection part can be formed without deviating the conductor center regardless of the thermal expansion of the conductor and unevenly forming the insulator wall thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the technical field of manufacturing a connection portion of a power cable, and more particularly to an apparatus for manufacturing a connection portion of a power cable using a polymer insulating material as an insulating composition on a conductor connection portion. Regarding the offer.

[0002]

2. Description of the Related Art FIG. 5 shows a typical example of a conventional power cable connecting part manufacturing apparatus, in which connected cables 1 are arranged in a horizontal direction and manufactured by a connecting part manufacturing apparatus 2. .

As the above-described connection manufacturing apparatus 2, there are a die for extrusion, a die for cross-linking, and the like for an extrusion mold connection (EMJ).

[0004]

According to the prior art described above; according to the power cable connecting portion manufacturing apparatus shown in FIG. 5, the following problems occur when the conductor size of the connected cable is increased. That is, when the conductor size of the connected cable is large, the conductor of the connection portion is easily shifted from the center position of the connection portion, and the thickness of the insulator in the connection portion is likely to be uneven. This is because when the size of the conductor is large, the weight of the conductor is heavy.
Alternatively, this occurs because the conductor hangs down by its own weight during the crosslinking treatment of the insulator.

Therefore, the problems to be solved by the present invention (objects)
It is an object of the present invention to provide a power cable connecting portion manufacturing apparatus capable of manufacturing a connecting portion of a power cable having a large conductor size without misalignment of a conductor or uneven thickness of an insulator.

[0006]

A first means provided by the present invention is a power cable connection part manufacturing apparatus for manufacturing a connection part by arranging a connected cable vertically.

[0007] By arranging the cables to be connected in the vertical direction as in the first means, even if the conductor has a large conductor size and a heavy conductor weight, the conductor can be prevented from being misaligned, and a predetermined conductor can be formed. Connection manufacturing can be performed. This is because the load direction due to the conductor's own weight coincides with the cable arrangement direction, so that the conductor does not deviate from the cable insertion center position of the device.

[0008] The second means provided by the present invention is:
An apparatus for manufacturing a connection part for a power cable, comprising: an extrusion die capable of arranging a cable to be connected in a vertical direction and extruding and coating an insulating composition on a conductor connection part of the cable to be connected. In this way, by arranging the cable to be connected in the vertical direction and extruding and molding the insulator with the extrusion die, it is possible to manufacture a connection portion without unevenness in the insulator.

Further, a third means provided by the present invention includes a cross-linking mold capable of vertically arranging a cable to be connected and molding and cross-linking an insulating composition coated on the cable to be connected. In the power cable connection part manufacturing equipment. As described above, by arranging the cable to be connected vertically and molding and bridging the insulating composition portion, a cable can be manufactured with a connection portion without uneven thickness.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a manufacturing method using an extrusion die embodying the second means of the present invention. Reference numeral 10 denotes a connected cable, reference numeral 20 denotes an extrusion die, and reference numeral 30 denotes an extruder. FIG. 2 shows an example of a manufacturing method using a cross-linking die embodying the third means of the present invention. Reference numeral 10 'denotes a connected cable having an extruded insulator, and reference numeral 40 denotes a cross-linking die.

FIG. 3 shows the state of conductor connection of the cable to be connected, and FIG. 4 shows the procedure for measuring uneven thickness of the cable to be connected after manufacture. In the reference numerals, 10 denotes a connected cable in a prepared state before manufacturing, 10 ″ denotes a connected cable in a completed state after manufacturing, 11 denotes a conductor (connecting portion), and 12 denotes an insulator that has been molded and cross-linked. .

Hereinafter, Examples 1 and 2 and Comparative Examples 1 and 2 will be described with reference to FIGS. 1, 2, 3 and 4 described above.

Embodiment 1 As a connected cable 10,
CV with conductor size of 3000mm ² and insulation layer thickness of 20mm
An extrusion mold joint; EMJ was manufactured using a cable. That is, first, as shown in FIG. 3, a conductor stripping process and a pencilling operation were performed on the connected cable 10, and after connecting the conductor, an inner semiconductive layer tube was applied to the conductor stripped portion. In this case, the conductor connection length is 500 mm.

Subsequently, the connected cable 10 subjected to the conductor connection processing as described above is set in a vertical extrusion die 20 as shown in FIG. 1, and the connected cable 10 is vertically arranged. In this state, the insulating composition extruded from the extruder 30 is extruded and coated on the conductor connection portion of the connected cable 10.

Subsequently, the extruded insulator is subjected to a molding process to cover the outer semiconductive layer tube, and then set in a vertical cross-linking mold 40 as shown in FIG. In a state where the connected cable 10 'is arranged in the vertical direction, the insulator is subjected to molding and bridging treatment, whereby a predetermined insulator is applied on the conductor connection portion, as shown in FIG. ″ Was completed.

FIG. 4 shows the procedure for measuring the thickness deviation of the insulator. In four directions, the thickness of the insulator 12 provided on the conductor (connection part) 11 in the above manner is divided into four equal parts in the circumferential direction. Each measurement was carried out to confirm the uneven thickness state of the insulator. The uneven thickness measurement results are shown in Table 1 below as Example 1.

[0017]

[Table 1]

[Comparative Example 1] As Comparative Example 1, an extruded mold joint having the same structure as in Example 1 above; a connected cable having EMJ was manufactured by a horizontal manufacturing apparatus shown in FIG. The thickness of the insulator on the connection portion was measured according to the example of FIG. The results are shown as Comparative Example 1 in Table 1.

As is clear from Table 1, according to the first embodiment, the thickness of the insulator on the conductor connection portion is equal in all four directions in the circumferential direction. This indicates that there is no insulator thickness deviation. On the other hand, in Comparative Example 1, when the direction 3 side is the lower side when arranging the cables as shown in FIG. 4, the thickness of the insulator in the lower direction 3 is 2 mm thinner than the upper direction 1. And this is
This is nothing but a deviation in thickness due to misalignment of the conductor.

[Embodiment 2] As Embodiment 2, an example in which the conductor connection length is longer than that of Embodiment 1 described above was adopted. That is, the structure was the same as that of Example 1, and the conductor connection length was 1000 mm.
In this case, the results of the thickness deviation measurement according to FIG. 4 are also shown in Table 1 as Example 2. As is evident from the results of the uneven thickness measurement, in Example 2 as well as in Example 1, 4
The insulator thickness was the same in any of the directions.

Comparative Example 2 A cable to be connected was manufactured in the same structure as in Comparative Example 1, except that the conductor connection length was 1000 mm. In this case, the results of the uneven thickness measurement according to FIG. 4 are also shown in Table 1 as Comparative Example 2. As is clear from the results of the uneven thickness measurement, the thickness of the insulator in the lower direction 3 was 4 mm thinner than that in the upper direction 1, confirming that the degree of uneven thickness was larger than that in Comparative Example 1. Was done.

[0022]

According to the present invention as described above, it is possible to manufacture a connection portion of a power cable having a large conductor size without any misalignment of conductors or uneven thickness of an insulator.
It is possible to achieve an intended task (object) of providing a power cable connection unit manufacturing apparatus.

In addition, the extension of the conductor due to heating during manufacturing can be released in the length direction of the conductor, that is, in the vertical direction. From this point, misalignment and uneven thickness of the conductor can be prevented. In the cooling step, the cooling control from the lower part to the upper part becomes easy.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of a manufacturing apparatus using an extrusion die embodying a second means of the present invention.

FIG. 2 is an explanatory view showing an example of a manufacturing apparatus using a cross-linking die embodying the third means of the present invention.

FIG. 3 is an explanatory view showing an example of a connected cable provided to the manufacturing apparatus according to the present invention.

FIG. 4 is an explanatory view of a procedure for measuring uneven thickness of a connected cable manufactured and completed according to the present invention.

FIG. 5 is an explanatory view showing a typical example of a conventional power cable connection part manufacturing apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 Connected cable 10 ′ Connected cable extruded with insulator 10 ″ Connected cable molded and bridged with insulator 11 Conductor (connection part) 12 Insulator 20 Extrusion mold 30 Extruder 40 Crosslinking mold

Claims (3)

[Claims] An apparatus for manufacturing a connecting portion for a power cable, wherein a connecting portion is manufactured by arranging the connected cables in a vertical direction. 2. An apparatus for manufacturing a connection part for a power cable, comprising: an extrusion die capable of vertically arranging a cable to be connected and extruding and coating an insulating composition on a conductor connection part of the cable to be connected. 3. An apparatus for manufacturing a connection part for a power cable, comprising a cross-linking die capable of vertically arranging a connected cable and molding and cross-linking an insulating composition coated on the connected cable.