JPH0631609Y2 - Overhead insulated wire manufacturing equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention aims to prevent stress corrosion cracking of aerial insulated wires by twisting hard copper strands to produce a conductor surface. The present invention relates to an apparatus for manufacturing aerial insulated wires that reduces residual stress generated in and also applies compressive stress.

[Conventional technology and its problems]

Generally, in overhead insulated wires, a stranded wire having a large tensile strength such as a hard copper wire or a hard aluminum wire is used as a conductor. This conductor retains tensile stress and bending stress during wire drawing or twisting of the wire.

On the other hand, when aerial insulated wires are installed, the terminal treatment is performed to prevent the conductor from corroding, but it is difficult to reliably prevent rainwater and the like from entering from this terminal under the present circumstances. In addition, due to recent air pollution, sulfur dioxide in the air and other harmful components are increasing the corrosion of conductors.

Therefore, today, the residual stress remains in the conductor as described above, and the synergistic effect of corrosion due to rainwater and harmful components,
That is, the stress corrosion cracking causes an adverse effect such as an abnormal disconnection in the stranded conductor.

In particular, when a copper wire is used as an element wire, the tendency is remarkably lower than that when an aluminum element wire is used, and the tensile strength of the element wire is remarkably reduced during long-term use, leading to fracture. The decrease is much larger and faster than the value of the tensile strength of the electric wire calculated in advance by taking into consideration the vibration of the conductor and the erection conditions such as its own weight.

Therefore, in order to improve this stress corrosion cracking phenomenon, it is conceivable to use annealed copper wire or semi-hardened copper wire as the outermost layer wire of the stranded conductor to reduce the residual stress. However, the semi-hard copper wire is difficult to control the pure temperature and the manufacturing cost is increased.

Further, it is conceivable to enclose a watertight compound in the cable to prevent rainwater from entering as much as in a corrosive atmosphere. However, this method also has a problem in manufacturing and workability.

In view of the current situation, in JP-A-55-108109,
In a method for producing an overhead insulated electric wire in which a twisted wire obtained by twisting a plurality of hard copper wires is used as a conductor, at least one of the wires before or after the twisting is applied to the wires and / or the twisted wires. A technique has been proposed in which a roller for imparting undulation is passed through to apply a processing strain to the strand or / and the strand.

That is, the proposed technique will be described with reference to FIG. 1 and FIG. 2. In the hollow shaft 1 of the twisting machine A, three or more wires are provided from each bobbin 2 along each running wire a. The rollers 3 are provided in a zigzag shape, and the strands a are run between the rollers 3. First, the strands a are undulated. The individual rollers 5 and 6 are provided in a zigzag pattern in the up-down direction and the left-right direction, respectively, and the twisted wire P is run between the rollers 5 or 6 in the same direction. The wire P is wound around the winding drum 7.

However, in this conventional technique, since the roller 3 is immovable, the degree of undulation cannot be changed according to the type (material, thickness, etc.) of the wire.

With the above points in mind, it is an object of the present invention to make it easy to adjust the roller position that determines the size of the undulation when applying the undulation of the wire and to reliably provide the undulation. To do.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, in the present invention, in the above-mentioned conventional known apparatus for manufacturing overhead insulated wire, a ring in which the center of three rollers corresponding to the wire is rotatably fitted to a hollow shaft is provided. This ring is provided so that it can be bolted by shifting the ring at a constant pitch in the circumferential direction, and at least three stranded wire correcting rollers are provided.

The number of rollers is three or at least three is three.
This is because, if there are individual pieces, the rollers can be made to undulate in an S-shape (right twist) or Z-shape (left twist), and the twisted wire can be processed and run. Therefore,
The number of strand rollers may be three or more.

[Action]

The aerial insulated wire manufacturing apparatus according to the present invention having the above-described structure is manufactured in the same manner as in the prior art by imparting undulations to the wires and applying strain to the twisted wires by the rollers.

At this time, by rotating the ring and fixing it at a required position, the central roller can be moved and the degree of undulation of the wire can be adjusted.

〔Example〕

As shown in FIGS. 1 to 3, the bobbin 2 in the twisting machine A is used.
The plurality of strands a fed from the wire pass through the final mesh plate 8 of the hollow shaft 1 through various strand guide means. The passed wire a passes through a preform B consisting of three rollers 3a, 3b, 3c (general code: 3) arranged in a zigzag manner to give a waviness before twisting, and is given a waviness. After twisting, twist with soybean 4.

Furthermore, the conductor (stranded wire) P twisted together is used for the upper and lower rolls 5a,
5b ... (general code: 5) and left and right rolls 6a, 6b ...
The stranded wire P is manufactured by passing the postforms C in which (generic code: 6) are alternately arranged in five steps in a zigzag pattern in the same direction.

The preform B has three rings 9a, 9b, 9c.
The outer peripheral surface of each ring 9 is machined in parallel with the line a passing line (running path) between the final eye plate 8 and the twisted soybean 4, and 12 screws 10 are arranged at equal intervals. Are threaded vertically on the outer peripheral surface, and the rollers 3 are rotatably fitted and inserted into the respective screws 10. Ring 9a
The guide groove of the roller 3a is fixed to the hollow shaft 1 by a bolt so that the guide groove of the roller 3a is on the line a passing line, and the ring 9c is bolted so that the guide groove of the roller 3c is also on the line a passing line. Has been done.

The ring 9b is fitted into the ring 9a so as to be rotatable in the circumferential direction, and eleven bolt holes 11b are formed at equal intervals in the circumferential direction. On the other hand, 12 screw holes 11a are formed on the same circumference as the bolt holes 11b at equal intervals in the circumferential direction on the entire circumference of the ring 9a fitted with the ring 9b. Therefore, there is only one place where the screw hole 11a and the bolt hole 11b are aligned with each other, and the bolt 11 is screwed into the screw hole 11a and the bolt hole 11b which are aligned with each other, so that both rings 9a and 9b are integrated. There are 11 matches between the holes 11a and 11b, and the roller position can be set at an integral multiple of the arc difference obtained by equally dividing the guide groove pitch circumference of each of the rollers 3a, 3c and 3b into 12 and 11. For example, when the pitch circumference of the center of the roller guide groove of the ring 9b is 660 mm, the arc difference is Becomes Therefore, the rollers 3a and 3c on both sides and the roller 3b
The difference (Fig. 2, t) can be set to 5, 10, 15 ... 55 mm. It is advisable to mark the set positions on the rings 9a and 9b in advance and to determine a predetermined combination of positions. The arc difference can be arbitrarily determined by the number of bolt holes 11b and screw holes 11a, and the number of rollers 3 on the outer peripheral surface of each ring 9 may be increased or decreased according to the number of strands a to be twisted.

In the figure, 13 is a lower twist drum, 14 is a take-up machine, and 5 is a rust preventive device.

Also in this embodiment, as in the conventional case, the roller 3 of the preform B imparts a swell to the strand a, and the rollers 5 and 6 of the postform C impart a processing strain to the stranded wire P, thereby reducing the tensile residual stress. And, a compressive residual stress is applied and the product is wound.

At this time, by rotating the ring 9b and fixing it at a required position, the undulation degree of the wire a is adjusted and the type of each wire a is changed.

Further, as shown in FIG. 4, the ring 9a and the ring 9b are
By rotating the rollers 3a, 3b, 3c to reverse the positions, Z twist can be dealt with.

[Effect of device]

Since the present invention is configured as described above, the position of the roller that imparts undulations to the strand can be changed stepwise at a fixed pitch and can be securely fixed, and the quality of the twisted wire is stable for various strands. The property is also improved.

[Brief description of drawings]

FIG. 1 is a schematic view of an embodiment of a manufacturing apparatus for aerial insulated wires according to the present invention, FIG. 2 is a front view of an essential part of FIG. 1, FIG. 3 is a sectional view of an essential part of FIG. FIG. 4 is an operation explanatory view. A ... twisting machine, B ... preform, C ... postform, a ... strand, P ... twisted wire, 1 ... hollow shaft, 2 ... bobbin, 3, 3a, 3b, 3c ... ... Roller, 4 ... twisted soybean, 5, 5a ... roller, 6, 6a ... roller, 7 ... winding drum, 8 ... eye plate, 9, 9a, 9b, 9c ... ring, 10 ... … Screw, 11a… Screw hole, 11b… Bolt hole, 12… Stand.

 ─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-56-121206 (JP, A) JP-A-57-98917 (JP, A) JP-A-57-105910 (JP, A) JP-A 61- 281412 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A hollow shaft of a wire twisting machine is provided with three rollers in a zigzag shape along each wire running path from each bobbin, and the wires are run between the respective rollers. At least three rollers are provided in a zigzag pattern in the vertical direction and the horizontal direction in the stranded wire running path in the latter stage of the twisting die, and the stranded wire is run between the rollers in the same direction. In an apparatus for manufacturing an overhead insulated wire wound on a winding drum, a central roller corresponding to the wire is provided on a ring rotatably fitted on a hollow shaft, and the ring is displaced by a constant pitch in the circumferential direction and bolted. An aerial insulated wire manufacturing device characterized by being tightenable.