JPS6362044B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION As shown in FIG. 7, the watertight conductor is made by filling the gaps 36 between the wires 18 with a filler called watertight compound 10' to provide airtightness. The present invention relates to a manufacturing method thereof.

Prior Art In the conductor stranding process, a method was used in which a liquid compound was applied to each layer.

Since it is a liquid watertight compound, the work area is easily dirty, and to prevent the watertight compound from dripping, it is necessary to wrap a pressure tape 38 around each layer, which reduces the work speed to 1/2 of the normal speed.
It had the disadvantage that it decreased to 4 to 1/6.

Another method used was to press-fit a liquid watertight compound from the outside all at once after the wire stranding process was completed.

However, as the number of conductor layers increases, it becomes difficult to press-fit them uniformly all the way to the center. Adding semiconductivity to a watertight compound increases its viscosity, so
There was a question of when it would become so difficult.

Purpose and Structure of the Invention The present invention aims to solve the above-mentioned problems. 1. To increase the viscosity of a conventional watertight compound to create a continuous thin solid elongated body that is soft and has viscoelasticity; 2. The elongated body is subjected to a conductor stranding process,
Depending on the arrangement of the strands 18, the strands 18 are inserted into the strand gaps 36 to block the space.

More detailed explanation of the structure A two-component curing compound is usually used as a watertight compound. These main ingredients and curing agents are each in liquid form at room temperature.

However, after a certain period of time has elapsed after mixing both, the viscosity increases, the fluidity is lost, and the mixture becomes a soft, viscoelastic solid.

Note that carbon powder may be mixed therein to impart semiconductivity.

The watertight compound 10 thus obtained is formed into a long tape (Fig. 1), and a separator 12 is placed on one side.
and wind it on reel 14.

Then, as shown in FIG. 2, the strands 18 are placed on the rotating cage 16 of the stranding machine with respect to the bobbin 20.

Note that a brake is applied to the feeding of the elongated body of the watertight compound 10 (the reason for this will be described later). An example is shown in "Figure 3". 22 is the shaft of the reel 14, 24 is the drum attached to it, 2
6 is a block brake, 28 is a lever, and 30 is a spring, the tension of which can be adjusted.

Reference numeral 32 denotes a squeezing means for squeezing the elongated tape-shaped watertight compound 10 into a round shape and sending it out, and a conventionally known structure is used.

Incidentally, when the tape-shaped watertight compound 10 is fed out, the separator 12 is peeled off by an appropriate means (not shown).

The elongated body of the watertight compound 10 squeezed into a round shape and the strands 18 move toward the die 34 so as to be converged, but at a distance from the die 34, in cross section, they are lined up as shown in "Figure 4". I'm here. It got closer to the die 34 - in the cross section it was "5th"
It will look like this.

And passed the die 34 - the cross section is "6th"
It will look like this. That is, the elongated body of the watertight compound 10 is inserted into the strand gap 36 of the strands 18 and closes the gap, and the remaining portion protrudes to the outside.

The elongated body of the watertight compound 10 has viscoelasticity as described above and stretches like rubber. Therefore, it is possible to apply the block brake 26 appropriately so as to tighten it by the required amount.

In FIG. 6, the area indicated by A is covered with the watertight compound 10, while the remaining area B is covered by the watertight compound 10 when the second layer is ascended in the same manner as described above.

Coating the outermost layer with a watertight compound and wrapping it with tape will be done in the next step.

Effect of the invention 1 A continuous thin long body of a watertight compound with high viscosity, softness, and viscoelasticity is made, and it is fed out while applying a brake, so by adjusting the brake, the thickness of the long body can be reduced. By controlling the thickness (the harder the brakes are applied, the thinner it becomes), it is possible to fill in just the right amount of space between the wires.

In other words, if the long body of watertight compound that is dispensed is too thin, gaps will be created between the wires, and if it is too thick, it will protrude and disturb the wire arrangement, and the cable will become thicker. Things will disappear.

Therefore, for example, a known technique (patent no.
165612 specification) is not required.

2. Since no liquid watertight compound is used,
Keeps the work area clean.

3. Since it is not necessary to wrap the holding tape 38 for each layer, the speed of the wire stranding process does not decrease.

4. Easy to implement even when using a large-sized conductor with a large number of layers.

[Brief explanation of drawings]

Figures 1 to 6 relate to embodiments of the present invention, with Figure 1 being an explanatory diagram of forming a watertight compound into a tape and winding it around the reel 14, Figure 2 being an explanatory diagram of the stranding process, and Figure 3 being an explanatory diagram of the stranding process. is an enlarged explanatory view of the reel 14 portion of the watertight compound 10, FIGS. 4, 5, and 6 are enlarged cross-sectional views of −, −, and − in FIG. 2, and FIG. 7 is an explanatory view of the prior art. . 10: Watertight compound, 18: Strand wire, 36:
Gap between bare wires.

Claims (1)

[Claims] 1 Increase the viscosity of the watertight compound to make it soft and
It is characterized by making a continuous thin elongated body with viscoelasticity, feeding it out while applying a brake in the conductor stranding process, twisting it together with the strands, and inserting it into the gap between the strands. Method of manufacturing watertight conductors.