JPS5812690B2 - Method for manufacturing electric wire support consisting of multiple spiral metal wires - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an electric wire support that supports an insulated electric wire on a support device such as a stay insulator or a pin insulator using a bundle of a plurality of spiral metal wires. The present invention relates to a method of manufacturing an electric wire support in which spiral metal wires are integrally bundled using a polymeric material.

The present invention will be specifically explained below based on the drawings.

Figure 1 is a schematic diagram of a device for feeding three strong metal wires 2a, 2b, 2c wound around drums 1, 1, 1 forward (to the right in the figure) at the same speed. .

This device is a further improvement of the metal wire feeding device disclosed in Japanese Patent Publication No. 40-6975 by the applicant of the present invention, so that it can feed a plurality of metal wires.

In the same figure, reference numerals 5, 5a, 5b, 5c, and 5d are feed rollers, which are arranged in upper and lower pairs, and grooves 6 are provided around the periphery, and metal wires 2a, 2b, and
It is designed to hold and feed 2c.

The feed rollers 5, 5a, 5b, 5c, and 5d are driven at the same circumferential speed by a drive device (not shown).

Of the 5 sets of feed rollers, 2 sets of front and rear feed rollers 5
, 5d are three metal wires (all metal wires) 2a, 2b, 2
The three middle-position feed rollers 5a, 5b, 5c each hold one metal wire (5
a acts to sandwich 2a, 5b holds 2b, and 5c holds 2c).

These feed rollers 5, 5a, 5b, 5c, and 5d move up and down in response to slight variations in the outer diameter dimensions (variations within tolerance) of the metal wires 2a, 2b, and 2c, and effectively move the metal wires 2a, 2b, and 2c. ，
2b, 2c.

Note that although the above is an example of the most desirable device for feeding a plurality of metal wires, the feeding device is not limited to this.

3, 3..., 4, 4... indicate a guide roller and a straightening roller.

Now, when the feed rollers 5, 5a, 5b, 5c, and 5d are rotated at a constant circumferential speed by a drive device (not shown), the metal wires 2a, 2b, and 2c are moved forward at the same speed, that is, the guide tube 7.
(first step) Next, the metal wires 2a, 2b, 2 fed in the first step
c is introduced into a die 8 provided with a spiral hole and forced to pass through the die 8 to form parallel spiral metal wire groups (second step).

That is, in FIG. 2, 8 is a die and the guide tube 7
The die 8 is provided with three spiral holes 81, 81, 81 along the longitudinal direction on the same axis with the same inner diameter and the same pitch.

Therefore, the fed metal wires 2a, 2b, 2c are bent into a spiral shape with the same inner diameter and the same pitch by the spiral holes 81, 81, 81, respectively, and become a parallel spiral metal wire group 9 to form the die. It is discharged from 8.

Next, the helical metal wire group 9 is introduced into the crosshead of the coating extrusion molding machine, and the helical metal wire group 9 is bundled together by surrounding it with a polymeric material (third step).

As the coating extrusion molding machine, a known extrusion molding machine 11 used for coating electric wires, etc. is used, and a crosshead 12 of the extrusion molding machine 11 is disposed on the exit side of the die 8.

Therefore, when the spiral metal wire group 9 sequentially discharged from the die 8 passes through the crosshead 12, the entire surface thereof is provided with a coating 10 made of a polymeric material such as polyethylene, vinyl chloride, synthetic rubber, etc. Spiral metal wire group 9
are integrally focused.

The coating 10 is desirably formed to have a thickness that has a dielectric strength that can withstand the wire voltage, and a thickness of 1 to 3 mm is usually appropriate.

Although not shown, metal wires 2a, 2b, 2 are placed at appropriate locations.
It is desirable to provide a preheating device (device for electrical heating, induction heating, infrared heating, hot air heating, etc.) as shown in c. and a suitable cooling device at a position subsequent to the crosshead 12.

The bundle of spiral metal wires 13 thus obtained is cut into desired dimensions, and the main parts are bent as necessary and according to the purpose to form a wire support.

FIG. 3 shows an example of a wire support A manufactured according to the present invention.

In this example, the spiral wire bundle 13 is formed by bending back the spiral of the intermediate portion 15 so that each metal wire 2at2b of the intermediate portion 15
2c has a straight line shape, and is further bent in half at the intermediate portion 15.

Such an electric wire support A is manufactured by, for example, the Utility Model Publication Act of 1994
Similar to the electric wire support described in No. 8, the bifold intermediate portion 15
The spiral legs 18, 18 are used by being engaged with a restraining device on a pole, and the spiral legs 18, 18 are wound around electric wires in an interlocking manner.
Since the coating 10 is formed by extrusion, an arbitrary and uniform coating layer can be obtained. Therefore, as shown in the opening of the figure, the coating 10
The spiral inner surface of the coating 1 is made into a wide smooth surface, and the coating 1
There is a U groove 17 between the metal wires 2a, 2b, and 2c on the back of the spiral 0.
, 17, it is possible to construct a highly flexible structure between the metal wires 2a, 2b, and 2c.

In the embodiment shown in FIG. 3, the metal wires 2a, 2b, 2c are not easily constrained by each other and are free (relatively free) due to the U grooves 17, 17, so that the entire inner surface of the spiral legs 18, 18 is By uniformly coming into close contact with the wire surface and by having a very wide and smooth bottom surface that comes into contact with the wire, the advantage is that the wire sheathing is not damaged more than the above-mentioned known products.

Reference numeral 19.19 is a cap fitted over the terminal to avoid exposure of the metal wires 2a, 2b, 2c.

FIG. 4 is a diagram showing another embodiment of the electric wire support B according to the present invention, which is used to intermediately support electric wires on a pin insulator.

In this example, the helical metal wire bundle 13 is in the middle part 2
0 is bent into a semicircular shape, and the spiral legs 21, 21 extend in opposite directions.

The wire support B has an intermediate portion 20 fitted to the neck of a pin insulator, and spiral legs 22, 22 wound around the wire to bind the wire to the pin insulator. The sheathing 10 is provided with fins 23, 23 on both sides of the helical inner surface so that the wire sheathing is further protected from damage because the helical inner surface is wider.

This kind of electric wire support has been known for a long time, and is
As disclosed in No. 19948, spiral metal wires cut to required dimensions are twisted together to form a spiral metal wire group, and if necessary, this spiral metal wire group is folded in half and the spiral leg portions are formed. It was customary to manufacture it by immersing it in a synthetic resin liquid or by coating the surface of the spiral leg with a synthetic resin liquid.

Therefore, firstly, there is a drawback that forming the spiral metal wire group requires time and effort, and secondly, since the coating is done by dipping or coating, it is impossible to obtain an arbitrary and uniform coating (particularly, the U
However, according to the present invention, multiple metal wires can be formed into a spiral shape at the same time by the first step and the second step. This makes it extremely easy to manufacture spiral metal wires, and since the coating is extruded, an arbitrary and uniform coating layer can be obtained, extending the life of the wire support and further improving the effect of preventing damage to the wire coating. The practical effects are significant.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an apparatus for carrying out the first step of the present invention, in which A is a plan view and the opening is a side view. FIG. 2 is a plan view of an apparatus for carrying out the second and third steps. FIGS. 3 and 4 each show an example of a wire support manufactured according to the present invention, and FIG. 1 is a metal wire winding drum; 2a, 2b, 2c are metal wires;
3, 4 are guide rollers and correction rollers, 5, 5a,
5b, 5c, 5d are feed rollers, 7 is a guide tube, 8 is a die, 9 is a spiral metal wire group, 10 is a polymer coating, 11 is an extrusion molding machine, 12 is a crosshead, A, B are wire supports .

Claims (1)

[Claims] 1. A first step of feeding a plurality of strong metal wires forward at the same speed, and introducing the metal wires fed in the first step into a die with a spiral hole, and a second step of forcibly passing through the metal wires to form a group of parallel spiral metal wires, and introducing the group of spiral metal wires from the second step into the crosshead of a coating extrusion molding machine, and surroundingly covering the metal wires with a polymeric material. and a third step of integrally converging the group of spiral metal wires.