JP3681045B2 - Low-voltage wiring cable and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a low-voltage wiring cable and a manufacturing method thereof, and more particularly to a low-voltage wiring cable generally used as an indoor low-voltage wiring and a manufacturing method thereof.
[0002]
[Prior art]
Low-voltage wiring cables such as 600V-rated vinyl-insulated vinyl sheath cables are economically superior, and are commonly used especially for indoor low-voltage applications. As shown in FIGS. 5 and 6, such a low-voltage wiring cable 30 is generally jute in a gap between insulated wire cores 32 formed by insulatingly covering a copper conductor 31 from the structure of a round cable. After interposing 33 such as a non-woven fabric and winding a tape 34 such as a non-woven fabric thereon, a PVC (polyvinyl chloride) sheath 35 (hereinafter referred to as “sheath 35”) is covered.
[0003]
In the above-described configuration, the tape 34 wound around the insulating core 32 and the interposition 33 prevents the twisted insulating core 32 and the interposition 33 from loosening and unraveling, and the insulating core 32 and the sheath 35 are directly connected. This prevents the insulation wire core 32 and the sheath 35 from sticking to each other.
[0004]
[Problems to be solved by the invention]
However, since the tape 34 is wound around the insulated wire core 32 and the interposition 33, the number of manufacturing steps increases, and the tape 34 needs to be removed when using the cable, so that the construction work is inefficient. It was.
In addition, the low-voltage wiring cable 30 is composed of multiple materials such as copper as the conductor 31, PVC as the insulator and sheath 35 of the insulation core 32, jute as the interposition 33, and non-woven fabric as the tape 34. For this reason, there is a problem that it takes time and effort to separate and recycle.
[0005]
In addition, when the presser tape is simply abolished, it is necessary to apply a release agent such as talc or a release agent to the insulation core so that the insulation core and the sheath do not stick. This means that the number of work steps at the time of manufacture increases, which is a problem in improving productivity.
[0006]
The present invention has been made in view of the above circumstances, and at the same time it is possible to improve productivity, and at the same time, it is possible to save labor in construction work, and to further reduce the manufacturing cost, and a manufacturing method thereof The purpose is to provide.
[0007]
[Problems to be solved by the invention]
Low pressure cables according to the present invention for achieving the above object, Ri Na by coating a plurality of insulated core wires in a sheath, the plurality of insulated core wires, the axis of the before coating with the sheath In the low-voltage wiring cable that covers the entire circumference with interposition so that the cross-sectional shape in the orthogonal direction is a substantially circular shape, the interposition is configured as a pair of interpositions divided in two by the vertical dividing plane, The plurality of insulated wire cores are integrally twisted together .
[0008]
And according to the said structure, it can prevent that an insulated wire core and a sheath contact directly by covering the perimeter of an insulated wire core with a pair of intervention. Therefore, the tape wound around the insulated wire core and the intervention by the conventional method is not necessary, and the tape removing work at the time of construction can be omitted.
Further, the manufacturing cost can be reduced by eliminating the need for a tape or by not using a release agent.
[0009]
Alternatively, the method of manufacturing a low-voltage wiring cable according to the present invention supplies a material for interposition to each of at least two dies of the first die and the second die, and forms a pair of interpositions. A plurality of insulated wire cores are conveyed to a twisted cap, and the insulated wire core and the interposition are integrally twisted with the twisted cap to cover the entire circumference of the insulated wire core with the intervening wire, and the insulated wire core The interposition is formed such that the cross-sectional shape in the direction orthogonal to the axis of the interposition is substantially circular, and then the outer periphery of the interposition is covered with a sheath.
[0010]
And, according to the above manufacturing method, since a pair of interpositions are formed in a separate process in advance and these interpositions are twisted simultaneously with a plurality of insulated wire cores, a tape winding process that has been conventionally required Can be omitted.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a low-voltage wiring cable and a method for manufacturing the same according to the present invention will be described in detail with reference to the drawings.
1 is a perspective view showing a configuration of a low-voltage wiring cable according to the present invention, FIG. 2 is a front view of the low-voltage wiring cable of FIG. 1, and FIG. 3 is a side view showing a low-voltage wiring cable manufacturing apparatus according to the present invention. 4 (a) is a front view showing a first die applied to the low-voltage wiring cable manufacturing apparatus according to the present invention, and FIG. 4 (b) is a front view showing the second die.
In the present embodiment, a case of two cores will be described as the low-voltage wiring cable.
[0012]
As shown in FIGS. 1 and 2, the low-voltage wiring cable 1 has two insulated wire cores 2 twisted together along the axial direction, and an intervening 5 described later around the entire circumference of these insulated wire cores 2. The sheath 8 is covered and covered.
The insulated wire core 2 is obtained by providing an insulation coating of PVC (polyvinyl chloride) on the copper conductor 3 with an extrusion molding machine.
[0013]
As shown in FIG. 2, the intervening 5 is shaped so that the cross-sectional shape in the direction orthogonal to the axis before the insulating core 2 is covered with the sheath 8 becomes substantially circular, and at the same time, the vertical dividing surface 7 is configured as a pair of molded bodies (5a, 5b) divided into two. That is, to form a void portion for accommodating across two insulated core wires 2,2 when integrated therein, and its outer peripheral surface in a circular shape. More specifically, the half-divided halves 5a and 5b have the same shape, the outer peripheral surface is formed in a semicircular arc shape, and the two semicircular arc surfaces in which the dividing surface side is recessed are formed side by side. Has been.
[0014]
The pair of half 5a, 5b and the twisting integrally the two insulating core wires 2, two insulated core wires 2 whole circumference is covered by the same time intervening 5 when accommodated in the gap portion Provided in the state. Thereby, the two insulated wire cores 2 are provided in a non-contact state with the sheath 8, and sticking to the sheath 8 is prevented.
[0015]
A method for manufacturing the low-voltage wiring cable 1 having the above configuration will be described with reference to FIGS.
First, the interposing material continuously supplied from the first interposing reel 10 passes through the hollow portion 13 of the first die 12 shown in FIG. 4A and is formed into one half 5a. Similarly, the interposing material continuously supplied from the second interposing reel 14 passes through the hollow portion 16 of the second die 15 shown in FIG. 4B and is formed into the other half 5b. These halves 5 a and 5 b are both conveyed to the twist cap 17.
[0016]
On the other hand, the insulated wire core 2 supplied from the first insulated wire core reel 18 is conveyed to the twisted cap 17 in synchronism with the halves 5a and 5b. Further, the insulated wire core 2 supplied from the second insulated wire core reel 19 is also conveyed to the twisting cap 17 in the same manner.
In the twist cap 17, the pair of halves 5 a and 5 b and the two insulated wire cores 2 are integrally twisted together, and as shown in FIG. The outer peripheral surface is arranged in a circular shape. Thereafter, the molded body is guided to a sheath extruder (not shown ) , and the PVC sheath 8 is covered with the interposition 5 to manufacture the low-voltage wiring cable 1.
[0017]
In this way, the pair of halves 5a and 5b is preliminarily molded with the first and second dies 12 and 15, and the halves 5a and 5b cover the entire circumference of the two insulated wire cores 2 for insulation. The wire core 2 and the sheath 8 can be made non-contact. As a result, it is possible to reduce the manufacturing cost by omitting the tape and the release agent in the conventional technique. Also, the removal work at the time of use is facilitated by omitting the tape. Further, the non-contact structure between the insulated wire core 2 and the sheath 8 prevents the insulator and the sheath from sticking together.
[0018]
By the way, if the cross-linked PE blend mainly composed of cross-linked PE shredded material is used as the interposition 5 by the present applicant in the low-voltage wiring cable already proposed in Japanese Patent Laid-Open No. 9-245536, the PVC insulator and the interposition There is no compatibility with the PVC sheath. Therefore, the intervening stripping operation when using the cable can be further improved, and an effect of contributing to the recycling process can be obtained.
In the above embodiment, the two-core low-voltage wiring cable has been described. However, the present invention can also be applied to a multi-core cable having two or more cores.
[0019]
【The invention's effect】
As described above, according to the low-voltage wiring cable according to the present invention, the insulation wire core and the sheath are prevented from coming into direct contact with each other by covering the entire circumference of the plurality of insulation wire cores with the intervention, which is conventionally required. This eliminates the need for a tape, eliminates the tape removal work when using the cable, and saves labor during construction.
In addition, by eliminating the need for a tape or a release agent, the manufacturing cost can be reduced and the productivity can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a configuration of a low-voltage wiring cable according to the present invention.
FIG. 2 is a front view of the low-voltage wiring cable of FIG.
FIG. 3 is a side view showing a low-voltage wiring cable manufacturing apparatus according to the present invention.
4A and 4B show dies used in the low-voltage wiring cable manufacturing apparatus shown in FIG. 3, wherein FIG. 4A is a front view of the first die, and FIG. 4B is a front view of the second die.
FIG. 5 is a perspective view showing a configuration of a conventional low-voltage wiring cable.
6 is a front view of the low-voltage wiring cable of FIG. 5. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Low voltage wiring cable 2 Insulated wire core 5 Interposition 8 Sheath 12 1st die 15 2nd die 17 Twist cap

Claims (2)

Ri Na by coating a plurality of insulated core wires in a sheath, interposed the plurality of insulated core wires, the entire circumference so that the cross section shape in the perpendicular direction to the previous axis covered with the sheath is substantially circular In the low-voltage wiring cable covered with
The interposition is configured as a pair of interpositions that are divided into two by a longitudinal dividing surface, and the interposition and the plurality of insulating cores are integrally twisted together . While supplying a material for interposition to each of at least two dies of the first die and the second die to form a pair of interpositions,
These interpositions and multiple insulated wire cores are conveyed to the twisted cap,
The insulated wire core and the interposition are integrally twisted with the twisted cap to cover the entire circumference of the insulated wire core with the interposition, and the cross-sectional shape in the direction orthogonal to the axis of the insulated wire core is substantially circular. The method for manufacturing a low-voltage wiring cable is characterized in that the interposition is formed as described above, and then the outer periphery of the interposition is covered with a sheath.

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