JPS5834884B2 - Manufacturing method of split conductor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing twisted line segment side conductors of power cables, and in particular to a method for manufacturing twisted line segment side conductors of electric cables, in particular, a copper oxide film is formed on a split conductor that has been subjected to compression molding and torsion preform processing. It relates to a method of insulating wires or a method of performing treatments such as washing with water and degreasing.

It has already been proposed to insulate the copper conductors of power cables by immersing them in an oxidizing solution to form a copper oxide film on their surfaces.

In this case, since the compression-molded divided conductor has very narrow strand spacing, it is difficult for the oxidizing liquid to penetrate inside.

Furthermore, during degreasing and water washing accompanying the oxidation treatment, it is similarly difficult to allow the treatment liquid to penetrate into the interior of the divided conductors.

The present invention utilizes the twisting of the divided conductors to
The preform of the divided conductor is loosened and the spacing between the strands is widened so that the processing liquid can easily penetrate into the inside.

Outline of the invention A divided conductor continuously passes through a processing liquid such as an oxidizing liquid,
The split conductor then passes through seals provided on the inlet and outlet sides of the processing tank.

If the seal is rotatable, the split conductor is preformed with torsion so that as the split conductor is withdrawn and advanced, the seal rotates around the center axis of the split conductor. do.

On the other hand, the processing liquid in the processing tank is pressurized.

Then, the pressure of the processing liquid acts to press the seal against a part of the processing tank.

That force acts as a resistance to rotation of the seal.

Therefore, we created a difference in the resistance force applied to the seals on the inlet and outlet sides of the processing tank, and used this difference in force to loosen the twist of the split conductor, widen the spacing between the strands, and allow the processing liquid to reach the inside. Make it easy to penetrate.

EXAMPLE An example of forming a copper oxide film on a divided conductor will be described.

10 in FIG. 1 is a divided conductor, which is advanced in the direction of arrow 12 by a pulling device (not shown) on the right side of FIG.

14 is an oxidation treatment, 16 is an oxidizing solution, for example 0.1
It is pressurized to about 2 kg/ffl.

181 is a seal on the inlet side, and 182 is a seal on the outlet side.

Both have a short cylindrical shape and are rotatable in contact with the inner surface of the oxidation treatment chamber 14.

The material is polytetrafluoroethylene, etc.

A hole 20 is provided in the center, through which the divided conductor 10 passes (FIG. 2).

Note that the outer diameter of the seal 181 is made larger than that of the seal 182, and the reason for this will be described later.

Seals 181 and 182 are pressed against side plate 22 of processing funnel 14 by the pressure of oxidizing liquid 16.

24 is a sliding surface.

26 and 28 are liquid containers.

The gap between the seal 18 and the divided conductor 10 or the divided conductor 10
The oxidizing liquid 16 blown out from the oxidizing treatment tube 14 is received through the stranded wire gap inside.

30 is an oxidizing liquid tank, and 32 is a pressurized circulation pump.

When the active divided conductor 10 is pulled and advances in the direction of the arrow 12, the seal 18 rotates, for example, in the direction of the arrow 34 (FIG. 3) because the divided conductor 10 is twisted as described above. is pressurized, so seal 181182
Forces Fl and F2 are applied to .

Therefore, friction occurs on each sliding surface 24, which causes the seal 18
becomes the resistance to rotation.

If the diameter of the seal 181 is made larger than that of the seal 182 as described above, F)>F20 Therefore, the resistance force of the seal 181 becomes larger than that of the seal 182.

As a result, as shown schematically in FIG. It will rotate by β.

Based on this (β-α), the divided conductor 10 is twisted in the direction of the arrow 36.

When the split conductor 10 is twisted in the direction of arrow 36, for example in the Z direction as shown in FIGS. 1 and 3, it is untwisted.

As a result, the distance between the strands becomes wider.

Then, since the pressure inside the divided conductor 10 is lower than that of the oxidizing liquid 16, the oxidizing liquid 16 easily penetrates into the inside, and further runs in the axial direction through the gaps between the strands, and the liquid receiver becomes the container 26. 28, it starts to eject to the outside of the divided conductor 10.

Therefore, the oxidation treatment is uniformly performed to the inside of the divided conductor 10.

Note that once the divided conductor 10 is out of the oxidation treatment chamber 14, the once loosened twist of the divided conductor 10 is restored by its own elasticity.

About how to create a difference in resistance.

When the pressure receiving area of the seal 181 is A1, the cross-sectional area of the divided conductor 10 is A, and the pressure of the oxidizing liquid is P, the force F1 applied to the seal 181 is as follows.

If the friction coefficient of the sliding surface 24 is μ, and the radius of rotation of the sliding surface 24 is rl (Fig. 1), then
The magnitude of the above-mentioned sliding resistance is such that the seal 18 can overcome it.
1 (generated from the force that pulls the divided conductor), so if that rotational force is T1, then TI = μ・Fl−rl−p・p (At AO
) rl (2) Therefore, pressure receiving area A1, rotation radius r
1 or by changing the frictional resistance μ, T1>F2 (F2 is the rotational force of the seal 182).

Further, if the torsional moment for creating an appropriate gap in the divided conductor 10 is U, then if the following is established, a certain untwisting phenomenon will always occur during processing, and the object of the present invention will be achieved.

In addition, when washing with water or degreasing, the treatment liquid can be changed, so it can be carried out exactly as desired.

Effects of the Invention (1) Since the twist of the divided conductor 10 itself and the pressure of the oxidizing liquid 16 are used to untwist the divided conductor, no other device is required.

(2) By untwisting the conductor, the processing liquid penetrates into the interior of the divided conductor, and the processing liquid is applied uniformly.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of an apparatus used to carry out the present invention, and FIG. 2 shows a cross section taken along line II-II. FIG. 3 is an explanatory diagram of a state in which return is provided by the divided conductor 10. 10... Divided conductor, 14... Oxidation treatment, 16.
...Oxidizing liquid, 181 and 182...Seal, 22...
Side plate, 24...Sliding surface.

Claims (1)

[Scope of Claims] 1. A twisted line segment side conductor that has been twisted in advance continuously passes through a processing liquid of a processing tank, and at that time,
The seals at both ends of the processing chamber are rotated as the divided conductor passes through the center thereof (in the method for manufacturing a divided conductor, the processing solution in the processing chamber is pressurized; The pressure presses the seal against a part of the processing tank, so that resistance is applied to the rotation of the seal, and there is a difference in the resistance force applied to the seal on the inlet side and the seal on the exit side of the processing tank. A method for manufacturing a divided conductor, characterized in that the divided conductor is loosened in a processing chamber by the difference in resistance between the divided conductors.