JPH05290656A - Wire twisting device for overhead power transmission line - Google Patents

Abstract

PURPOSE:To accurately manufacture an overhead power transmission line in a spiral shape by spirally forming a groove in a machining hole of a collecting die for twisting element wires. CONSTITUTION:A recess 4 having a predetermined length and serving as a machining hole 3 is formed into an almost circular shape on the inner surface of an outer core 2 of a divided piece 5. A collecting die 1 is such constituted that the recesses 4 of the divided pieces 5 face to each other. Both ends of the outer core 2 constitute an inlet side 6 and an outlet side 7 of the die 1, respectively. A spiral groove 8 is formed on the recess 4 of the divided piece 5 according to a twisting pitch from the inlet side 6 of the die 1 toward the outlet side 7 thereof. A plurality of element wires to be supplied from a twisted wire machine are collected on the axis on the inlet side 6 of the die 1, to be thus fed to the machining hole 3. The hole 3 is formed in an approximately cylindrical shape with the recesses 4 of the divided pieces 5 facing to each other, and the spiral grooves 8 are formed in the divided pieces 5. Consequently, the element wire which is pressed into the hole 3 is formed into an approximately circular shape, thus realizing an overhead power transmission line having projections.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a twisting device of an overhead power transmission line for molding an overhead power transmission line having a spiral projection, and more particularly to an overhead transmission capable of accurately molding the projection in a spiral shape. The present invention relates to a wire twisting device.

[0002]

2. Description of the Related Art Some overhead power transmission lines are provided with projections continuously on the outer periphery thereof and are twisted so that the projections spirally surround the overhead power transmission line. It is known that the provision of such a spiral protrusion on the overhead power transmission line produces a snow accretion prevention effect that prevents snow from adhering and a wind noise prevention effect that prevents the generation of wind noise. Is used to make difficult-to-snow electric wires and low-noise electric wires.

An overhead power transmission line is an assembly of a plurality of strands twisted together, and a spiral protrusion is formed at the same time as the strands are twisted together. For this purpose, a groove portion for forming a protrusion is provided in a processing hole of a collective die for twisting the strands.
The assembly die has a substantially cylindrical processing hole that follows the finished cross section of the overhead power transmission line.Several strands are fed from the mouth side of this processing hole, press-molded in the processing hole, and rotate the assembly die. By doing so, the overhead power transmission line sent from the outlet side is twisted at a predetermined pitch and molded into a substantially cylindrical shape. Therefore, by providing the groove portion, the projection that has passed through the groove portion is formed in a spiral shape around the overhead power transmission line as the assembly die rotates.

A conventional assembly die has a substantially cylindrical processed hole, and a divided piece of a predetermined length, which is divided into two in a plane including a center line, faces each other, and a plurality of strands are sandwiched in the processed hole. It is configured so that it can be pressed inward in the radial direction. Figure 6
As shown in FIG. 5, the divided piece 61 has a semi-cylindrical concave portion 62, and when the two divided pieces 61 are put together, the concave portion 62 forms a processed hole. The recess 62 is provided with a straight groove 63 which serves as a groove for molding the protrusion. The straight groove 63 has an angle equal to the twist angle with respect to the center line in accordance with the twisting pitch, and is formed straight from the inlet side 64 to the outlet side 65 of the assembly die. Therefore, the shape of the straight groove 63 viewed from the side surface side of the assembly die is as shown in FIG.
It has a linear shape as shown in the B view of (b).

[0005]

By the way, in the above-mentioned conventional assembly die, the groove portion for molding the projection is constituted by a straight groove. On the other hand, since the projection formed around the overhead power transmission line has a spiral shape, the angle with respect to the center line is constant, but the radial angle constantly changes. Further, in the straight groove, the distance between the bottom portion and the semi-cylindrical inner peripheral wall of the processed hole is not constant, and the depth is not uniform between the inlet side and the outlet side. That is, the straight groove is provided so as to approximate a spiral shape, and does not exactly match the spiral protrusion.

Since the straight groove does not coincide with the spiral protrusion in this manner, the protrusion comes into uneven contact with the side surface of the straight groove in the straight groove. As a result, the protrusions are distorted and deformed in places, and the overhead power transmission line cannot be finished to have an ideal spiral protrusion. Since the above-described snow accretion prevention effect and wind noise prevention effect are generated by forming the protrusions in a spiral shape, deformation of the protrusions reduces these effects.

Conventionally, such a problem was considered to be unavoidable, but a solution was sought in order to improve various performances of the overhead power transmission line as much as possible. In order to solve this problem, the applicant considered that it is necessary to change the shape of the groove from a straight groove to a new shape. To this end, it was considered that the utility value would be great if the groove is such that it is not manufactured by a simple process, such as a straight groove, but the effect can be greatly obtained.

Therefore, an object of the present invention is to solve the above problems and to provide a stranded wire device for an overhead power transmission line, which is capable of accurately forming a protrusion in a spiral shape.

[0009]

In order to achieve the above object, the present invention is to form a spiral groove portion in a processing hole of an assembly die for strand-forming strands.

Further, a forming piece is attached to a processing hole of a collective die for forming strands by twisting to form a spiral projection.

[0011]

With the above structure, since the groove is spiral, the spiral projection formed on the outer periphery of the overhead power transmission line and the groove are exactly aligned with each other. Therefore, the force is uniformly applied to the protrusion, and the protrusion is not deformed.

In addition, when the projection has a complicated contour,
If the width of the protrusions is relatively large with respect to the overhead power transmission line and it is difficult for the holes other than the protrusions to be processed by the assembly die, a forming piece is attached to the processed hole of the assembly die to form a spiral protrusion Since the spiral protrusion formed by the molding piece hits the complicated contour and the portion other than the protrusion, the molding becomes accurate.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a divided piece which constitutes a part of an assembly die 1 according to the present invention. FIG. 1A is a front view and FIG. 1B is a side view seen from A in FIG. As shown in the figure, the divided piece 5 is inside the outer shell 2,
A substantially cylindrical recess 4 having a predetermined length to be the processed hole 3 is formed. The assembly die 1 is configured such that the concave portions 4 of the divided pieces 5 face each other. Both ends of the outer shell 2 respectively form an inlet side 6 and an outlet side 7 of the assembly die 1. A spiral groove 8 is formed in the recess 4 of each divided piece 5 from the inlet side 6 to the outlet side 7 of the assembly die 1 in accordance with the twisting pitch.
The shape of the spiral groove portion 8 viewed from the side surface side of the assembly die 1 is curved as shown in FIG.
The difference from the straight groove is clearly shown. The spiral groove portion 8 has a constant depth from the inlet side 6 to the outlet side 7.

A twisting device 20 using the above assembly die 1.
Is shown in FIG. As shown, the twisting device 20
Is a stranded wire machine 23 that supplies a plurality of strands 22 from the outside in a concentrated manner to the shaft center and rotates around the shaft center, and the assembly die 1 is held and the assembly die 1 is centered. A holding table 24 that rotates in synchronization with the twisting machine 23 is provided around the. The assembly die 1 is arranged with its inlet side 6 facing the twisting machine 23. Although not shown, a drum or the like for winding the overhead power transmission line 25 sent from the collecting die 1 is provided on the downstream side of the holding table 24 facing the exit side 7 of the collecting die.

Next, the operation of the embodiment will be described.

A plurality of strands 2 supplied from the twisting machine 23
2 is concentrated on the axial center on the inlet side 6 of the assembly die 1 and fed into the machined hole 3. Since the recesses 4 of the divided pieces 5 face each other and the processed holes 3 are formed in a substantially cylindrical shape, and the spiral groove portion 8 is formed in each divided piece 5, a plurality of elements pressed into the processed holes 3 are formed. The wire 22 is molded into an overhead transmission line which has a substantially circular shape in its cross section and has a protrusion 33 as shown in FIG. In the cross-sectional view shown in FIG. 3, 5 is each divided piece of the assembly die, 22a, 22b,
And 22c are various strands. With the rotation of the twisting machine 23 and the assembly die 1 and the winding from the downstream side, the projection 33 is continuously formed in a spiral shape, and the molded overhead power transmission line 25 is sent out from the exit side 7 of the assembly die 1. Be done.

While the plurality of strands 22 are twist-molded and pass through the assembly die 1, the projection 33 has a spiral groove portion 8.
Moves along and along with the projection 3
The force is uniformly applied to 3, and the protrusion 33 is not deformed. Therefore, an accurate spiral projection is formed on the overhead power transmission line 25 sent from the outlet side 7.

In the above embodiment, the outer diameter of the overhead power transmission line is 10 to 5 if the numerical values for obtaining a suitable result are shown.
0 mm, the pitch of the protrusions (twisting pitch) in the finish of the overhead power transmission line is 150 to 500 mm, and the pitch of the grooves is ± 10 mm in the finish.

Next, another embodiment of the present invention will be described.

FIG. 4 is a cross-sectional view of the assembly die and overhead power line replaced with FIG. 3 of the above embodiment. That is, the assembly die 1, the divided pieces 5, and the wires 22a, 22b, 22c are shown. In this embodiment, the protrusion 33 is not a single protrusion but is recessed radially inward from the top of the protrusion to form the recess 34 of the protrusion, and the cross section of the protrusion 33 represents a complicated contour. The groove 8 must have a shape corresponding to this protrusion. Since it is difficult to spirally form a groove portion showing such a cross-sectional contour in the concave portion 4 of the divided piece 5, the wide first-stage groove 26 is processed, and the groove 2 is further processed.
A narrow second-stage groove 27 is machined in 6 and a molding piece 28 is mounted in the second-stage groove. The molding piece 28 is attached so that the base portion fits into the groove 27 of the second step and the top portion projects into the groove 26 of the first step, and is fixed to the assembly die 1 with a screw or the like. As a result, a groove having a complicated cross section as shown in FIG. 4 is spirally formed from the inlet side 6 to the outlet side 7 of the assembly die 1. By using such an assembly die 1 in the twisted wire device of FIG. 2, an overhead power transmission line 2 having a continuously spiral cross section of FIG.
5 can be molded.

Next, in the embodiment shown in FIG.
It is suitable when the width of the protrusion is relatively large with respect to the outer diameter of the overhead power transmission line. FIG. 5 shows the assembly die 1, the divided pieces 5, the strands 22, and the protrusions 23. In this example, the assembly die 1 is divided and formed at an appropriate position 29 of a portion (corresponding to an arc having a large diameter in FIG. 5) applied to the protrusion 33, and at a position substantially perpendicular to this, the overhead power transmission line is The top of the molding piece 30 is applied to the outer circumference (corresponding to an arc having a small diameter in FIG. 5). The base of the molding piece 30 is fitted into a groove 31 formed in a spiral shape and is fixed with a screw 32 or the like. With this configuration, even in an overhead power transmission line having a wide projection 23, a force is uniformly applied, and the shape of the projection is accurately formed into a spiral shape.

[0023]

The present invention exerts the following excellent effects.

(1) Since the shape of the protrusions is a spiral shape with high accuracy, the snow accretion preventing effect and the wind noise preventing effect can be reliably achieved.

(2) Since the force is uniformly applied during the twisting and molding, the pressing is good, and the post-twisting is unlikely to occur.

[Brief description of drawings]

FIG. 1 is a front view and an A-side view of an assembly die used in a twisted wire device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a twisted wire device showing an embodiment of the present invention.

FIG. 3 is a cross-sectional view of an assembly die and an overhead power transmission line showing an embodiment of the present invention.

FIG. 4 is a cross-sectional view of a collective die and an overhead power transmission line showing another embodiment of the present invention.

FIG. 5 is a cross-sectional view of an assembly die and an overhead power transmission line showing another embodiment of the present invention.

FIG. 6 is a front view of an inlet side of a collective die showing a conventional example and B.
It is a visual side view.

[Explanation of symbols]

 1 Assembly Die 3 Machining Hole 8 Groove 20 Stranding Device 22 Elementary Wire 28 Molding Piece 33 Projection

Claims (2)

[Claims] 1. A twisting wire device for twisting a plurality of strands to form an overhead power transmission line and continuously forming projections on the outer periphery thereof at the same time. A twisted wire device for an overhead power transmission line, characterized in that a groove is formed in a spiral shape in the processed hole. 2. The overhead transmission line according to claim 1, wherein a forming piece is attached to a processing hole of a collective die for forming the strands by twisting to form a spiral projection. Stranding device.