JPH05128923A - Manufacture of hollow stranded wire - Google Patents

Abstract

PURPOSE:To provide a good hollow stranded wire the strand spacings in the inner layer of which are kept constant by twisting while the strand spacings are kept in a predetermined spacing when strands in the inner layer of the hollow stranded wire are twisted. CONSTITUTION:When strands 17A in the inner layer of a hollow stranded wire are twisted together, a twisting die 31, in which a plurality of strand guiding holes are formed in the circumferential direction at a predetermined interval. The twisting die 31 is mounted on a die holder 37 supported by a fixing supporting body 39 in such a way that it can freely rotate about a stranded wire core 11, and subsequently strands 17A are passed through the strand guiding holes, while the inner layers are twisted with the twisting die 31 set rotatably free.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a hollow stranded wire used as an overhead power transmission line or an overhead ground wire.

[0002]

2. Description of the Related Art Conventionally, stranded wires such as overhead power lines and overhead ground wires are manufactured as shown in FIG. That is, the bobbin 15 of the twisting machine 13 is rotated around the running twisted core material (usually twisted wire or strand) 11, and the strand 17 drawn from this bobbin 15 is the outer periphery of the twisted core material 11. The wooden twisted mouth 19 is fixedly arranged at a position where it is twisted with, and the tightening leather 21 with a leather string is wound in front of it, and the twisted wire 23 is manufactured by applying equal tightening force to each wire 17 from the outer circumference. .

[0003]

However, in this method, as shown in FIG. 5, a plurality of wires 17A are twisted in the inner layer at intervals and a large number of wires 17B are tightly twisted in the outer layer. When manufacturing the hollow stranded wire 25, in particular, when attempting to twist the inner layer wires 17A at intervals in the circumferential direction, the wires 17A rotate inside the twisted opening 19 and the fastening leather 21 in the fixed state. However, the wire 17
The interval A was not constant, and a good hollow stranded wire could not be manufactured.

[0004]

The present invention provides a method for producing a hollow stranded wire, which solves the above problems.
That configuration, when twisting the inner layer of the hollow twisted wire, using a twisting die having a plurality of wire guide holes for twisting a plurality of wires at a predetermined interval in the circumferential direction,
This twisting die is attached to a die holder supported by a fixed support so that it can be rotated around a twisted core, and the strand is guided through the wire guide hole, and the twisting die is free to rotate. The inner layer is twisted in this state.

[0005]

In this way, the inner layer strands are kept at a predetermined distance by the twisting die, and the twisting die freely rotates following the rotation of the strands, so that the inner layer strands are twisted. It is possible to twist the core material around the outer circumference of the core material at a predetermined interval without difficulty.

[0006]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention. In this method, a twisting die 31 as shown in FIG. 2 and FIG. 3 is used when the strands 17A of the inner layer are twisted around the outer circumference of the twisted core material 11. This twisting die 31 is a plastic or metal halved tubular body, a plurality of strand guide holes 35 around the central hole 33 through which the twisted core material 11 passes, with a predetermined interval in the circumferential direction, In addition, it is formed at an angle corresponding to the pitch angle of the strands 17A to be twisted together.

The twisting die 31 is, as shown in FIG.
A stranded wire core 11 is attached to the front end of a cylindrical die holder 37 that passes through the stranded wire core 11, and the die holder 37 is rotatably supported by a fixed support 39 via a bearing 41.
As a result, the twisting die 31 can freely rotate at a position where the wires 17A are twisted together.

In this way, when the twisting die 31 is made to rotate freely and the strands 17A are passed through the strand guide holes 35 and twisted together, the strands 17A are held at predetermined intervals and the twisting die is Since 31 rotates following the rotation of the strands 17A, the strands 17A are twisted around the outer circumference of the twisted core material 11 while being kept at a predetermined interval, and a good hollow twist in which the spacing between the strands of the inner layer is constant. The wire 29 can be manufactured.

[0009]

As described above, according to the present invention, when the strands of the inner layer of the hollow stranded wire are twisted together, the strands can be twisted in a state where the intervals between the strands are kept at a predetermined interval. Therefore, it is possible to manufacture a good hollow stranded wire in which the wire spacing of the inner layer is constant.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a method for manufacturing a hollow stranded wire according to an embodiment of the present invention.

FIG. 2 is a front view of a twisting die used in the method of FIG.

FIG. 3 is a side view of the twisting die used in the method of FIG.

FIG. 4 is an explanatory view showing a conventional twisted wire manufacturing method.

FIG. 5 is a cross-sectional view showing an example of a hollow stranded wire.

[Explanation of symbols]

11: Twisted wire core material 13: Twisting wire machine 15: Bobbin 17A: Inner layer element wire 17B: Outer layer element wire 25: Hollow twisted wire 31: Twisting die 33: Center hole 35: Element wire guide hole 37: Dice holder 39: Fixed support 41: Bearing

Claims (1)

[Claims] 1. A method for producing a hollow stranded wire in which a plurality of strands are twisted in an inner layer at intervals and a large number of strands are tightly twisted in an outer layer, when twisting the inner strands The twisting die is formed with a plurality of strand guide holes for twisting a plurality of strands at a predetermined interval in the circumferential direction, and this twisting die is centered around the strand core material. It is attached to a die holder rotatably supported by a fixed support, and the strand is guided through the strand guide hole, and the inner layer is twisted while the twisting die is free to rotate. And a method for producing a hollow stranded wire.