JPH02170314A - Manufacture of compressed conductor - Google Patents

Abstract

PURPOSE:To make it possible to manufacture a compressed conductor of a good finished shape by longitudinally attaching the slivers of a first layer without twisting and twisting and compressing slivers of the second and later layers. CONSTITUTION:Slivers 19 of a first layer are linearly aligned and bundled without twisting. Slivers 15 of a second layer are twisted together and compressed to form a required shape. As a result the slivers 15 of the second layer necessarily intersect the slivers of the first layer. Therefore, the slivers 15 of the second layer are not wedged between the slivers 19 of the first layer. Slivers of the third and later layers do not wedge either. This makes it possible to manufacture a compressed conductor of a good finished shape.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method of manufacturing a compressed conductor with a refined finished shape.

(Prior art) Conventionally, large-sized conductors for chemical cables have been
In order to reduce the skin effect and improve flexibility, for example, a plurality of segments 1 made of fan-shaped compressed conductors are twisted together as shown in FIG. 2(a). .

Such a conventional segment 1 is usually made by twisting several strands of strands at a predetermined pitch, compression molding this into a predetermined shape to form a first layer, and then layering two wires on top of it in the same way. It is manufactured by forming a layer, a third layer, and so on.

However, when the segment 1 is manufactured by such a conventional method, the shoulder portion 3 of the segment 1 often has a shape shown in FIG.
As shown in b), there was a problem in that the strands of the upper layer fell between the strands of the lower layer, forming a depression 5.

Although this depression 5 is not desirable in terms of appearance even when it is formed in the outermost layer, in particular, when the depression 5 is formed in the lower layer as shown in FIG. The wire 7 enters the recess 5, which causes problems such as the strand 7 being replaced with the adjacent strand 9 during compression and the strands 7 being arranged irregularly.

(Problems to be Solved by the Invention) As described above, in the conventional manufacturing method of compressed conductors, depressions may be formed in the layer of twisted wires, resulting in a problem that the finished shape of the segments is poor. there were.

The present invention was made to solve these problems, and its purpose is to provide a method for manufacturing a compressed conductor with a good finished shape.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention has a method in which a plurality of strands of strands are aligned and converged in a straight line, and a plurality of strands of strands are layered around the outer periphery. It is characterized in that it is twisted together and compression-molded into a fan shape, and further, a plurality of strands are twisted around the outer periphery in a layered manner in the same direction as the lower layer and compression-molded into a fan shape.

(Function) In the present invention, the strands of the first layer are not twisted but are spliced vertically, and the strands of the second and subsequent layers are twisted and compressed, so that the strands of the first layer can be freely adjusted according to the segment shape. This eliminates the formation of depressions in the strands at the shoulder portions of the segments, and improves the finished shape of the segments.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 schematically shows a twisting device used in the present invention, in which a flyer 13 is coaxially installed on the outer periphery of a rotatably installed cylindrical shaft 11. A plurality of bobbins 17 that supply the second layer of strands 15 are mounted.

A disc-shaped batten 21 is installed concentrically on the outer periphery of the tip of the shaft 11, and a support arm 23 protrudes forward from the front surface of the batten 21, on which a die 25 is attached. is rotatably held via bearings.

The dice 25 are installed to prevent the first layer of wires 19 from twisting and to bundle several wires together.

Furthermore, on the extension of the axis of the shaft 11, a twisting port 27,
A compression roll 29 is arranged to compress and mold the twisted strands into a predetermined external shape.

When the shaft 11 is rotated in order to twist the second layer of wires 15, the batten 21 and the like rotate together with it, but the die 25 is attached to the batten 21 via a bearing. Therefore, the rotation of the batten 21 is not transmitted to the die 25.

In addition, when manufacturing a preform compression stranded wire, the compression roll 29 is rotated according to the pitch. At this time, the cage of the first layer strands 19 (
(not shown) are rotated in synchronization with the compression roll 29 in the same direction.

Next, the method of the present invention will be explained.

First, the first layer of strands 19 of 7 twists (5 to 6 twists depending on the shape) is pulled out from a winding drum (not shown).
This is vertically arranged in a straight line without twisting and guided through the shaft 11 and the die 25 to the twisting port 27.

Next, the second layer of wire 15 unwound from the bobbin 17 is guided to the twisting port 27 via a guide roll (not shown) and a batten 21, and the outer circumference of the first layer of wire 19 is This is twisted together and further passed through a compression roll 29 to obtain a predetermined segment conductor.

At this time, since the strands 19 of the first layer are not twisted, the strands 15 of the second layer always intersect with the strands 19 of the first layer. The strands 15 do not fall into between the strands 19 of the first layer.

Similarly to the second layer, the third layer of strands is twisted around the outer periphery of the conductor, and similarly compression molded to obtain a predetermined compressed conductor.

The third and subsequent layers are twisted in the same direction as the strands 15 of the second layer and compression molded into a predetermined shape as before.

[Effects of the Invention] As explained above, according to the present invention, the strands of the first layer are aligned and converged in a straight line without being twisted, and the strands of the second layer are layered around the outer periphery of the strands. Since the wires in the second layer are twisted together and compression-molded into a predetermined shape, the wires in the second layer always intersect with the wires in the first layer. There is no depression between the strands of the eye, and there is also no depression of the strands of the third or higher layers twisted thereon, making it possible to manufacture a compressed conductor with a good finished shape.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram schematically showing a twisting device used in an embodiment of the present invention, FIG. 2(a) is a perspective view of a segment conductor forming a compressed conductor, and FIG. 2(b) is a segment conductor. An enlarged view of the shoulder portion of FIG. 2(c) is a diagram showing irregularly arranged strands. 1... Segment, 15... Second layer strand, 19.
...First layer strand, 25...Dice, 27...Twisting end, 29...Compression roll Applicant: Showa Cable and Wire Co., Ltd. Patent attorney Suyama Sa - (Fool's name) 菟]

Claims (1)

[Claims] Multiple strands of strands are aligned in a straight line and bundled, and the strands of strands are twisted in layers around the outer periphery and compressed into a fan shape, and then multiple strands of strands are layered around the periphery in the same direction as the lower layer. A method for manufacturing a compressed conductor, which comprises twisting the conductors together and compressing them into a fan shape.