JPS5893113A - Method of producing watertight wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a watertight electric wire manufacturing method.

Outdoor high-voltage distribution lines, outdoor low-voltage distribution lines, submarine power lines, etc. are filled with watertight compound along the entire length of the wires and between the conductor wires to prevent the intrusion of moisture, etc., and prevent oxidation of the conductor wires and stone corrosion. This is to prevent abnormal disconnection.

Conventionally, in order to manufacture watertight electric wires as described above, the conductor strands are twisted together and a watertight compound is filled between the strands so that the product has a completely watertight structure.

In the above manufacturing method, the watertight compound supplied between the wires by the extruder cools while the wires go to the Nishiki rod die, and especially in the case of round-stranded conductors, when squeezed with the die, the watertight compound cools and solidifies. Since the watertight compound pushed up on the conductor causes strong rubbing between the conductor surface and the die, there is a risk that the conductor surface may be damaged. '-Also, when the conductor becomes irritated, there is a drawback that the water resistance deteriorates.

The present invention has been made based on the above-mentioned circumstances, and an object of the present invention is to obtain a watertight electric wire manufacturing method that does not cause damage to the conductor in the twisting die and does not cause the risk of deterioration of watertightness.

In the present invention, the above object is achieved by insulating or heating the conductor between an extruder that supplies a watertight compound and a twisting die.

The invention will now be described in detail with reference to the drawings. In FIG. 1, a watertight compound is supplied by an extruder 4 to a 6F center conductor 3 supplied from a supply reel 2 to a first stage wire twisting machine 1 that forms a twisted wire, and the extruder 4 and the first stage The center conductor 3 is kept warm between it and the i-logis 1a of the wire twisting machine 1 by a heat insulating tube 5.

A second stage wire stranding machine supplies a watertight compound to the second extruder 7 to the stranded wire 6 that has passed through the stranding die 1a of the first stage stranded wire 1, and then twists a conductor element wire onto this 6F stranded wire. The Eri 6F twisted wire is kept warm in a heat insulating tube 9 between the twisting die 8a of No. 8 and the extruder 7. In FIG. 1, numeral 10 indicates a take-up machine, and numeral 11 indicates a winding machine.

In the above manner, the compound supplied from each extruder will not be cooled and solidified until it enters each twisting die, and there is no risk of damage to the conductor surface or deterioration of watertightness due to this.

Figure 2, in which the same parts as those in Figure 1 are given the same reference numerals, shows another embodiment of the present invention. In this embodiment, heating cylinders 12 and 131 having small-diameter openings on the sides of the twisting dies 1a and 8a are installed in the heat-insulating cylinders 5 and 9, and hot air is supplied to the nozzles 14 and 15 from these openings on the extruder side. supply

In this embodiment as well, the same effects as in the embodiments described above can be obtained without cooling and solidifying the watertight compound.

The same parts as in FIGS. 1 and 2 are given the same reference numerals in gold. FIG. 3 shows still another embodiment. In this embodiment, an induction coil 16.17 is provided in place of the heat insulation cylinder 5.9 in FIG. 18.19 indicates a high frequency power source. This embodiment also provides the same effects as those of the embodiments described above.

[Brief explanation of drawings]

1, 2, and 3 are schematic diagrams of first, second, and third embodiments of the present invention. 1. Wire twisting machine, la, 8m... twisting die, 3.
... Center conductor, 4, 7... Extruder, 5.9... Heat insulation tube, 6... 6F stranded wire, 12, 13... Heating tube, 16
．． 17...Induction coil. Patent attorney for application: Kikuchi Gobe Doyama 1) Shin Akira 11

Claims (1)

[Claims] A watertight electric wire manufacturing method characterized in that a conductor is kept warm or heated between an extruder that supplies a watertight compound and a twisting machine die.