JPH0419652B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a power cable conductor strand stranding device having a mechanism for winding an insulating tape between lower layer stranded wires and upper layer stranded wires.

(Technical background of the invention and its problems) In order to reduce the alternating current resistance due to the skin effect of power cables, insulating tape is wound between the upper layer conductor strands and the lower layer conductor strands as conductor segments of the power cable. Conductors that are then compressed into a fan-shaped cross section are often used.

As shown in FIG. 1, when manufacturing a two-layer conductor W having a circular cross section, when winding an insulating tape 2 on the first layer stranded wire 1, conventionally, the first layer conductor element wire 1a
A new tape winding device was installed between the first layer twisting device for twisting the conductor wires 3a and the second layer twisting device for twisting the second layer conductor strands 3a.
However, such a device requires space for the tape winding device, and has the disadvantage that the space factor of the stranding device is poor.

Furthermore, as described in Japanese Patent Application Laid-open No. 55-105911, a method is known in which the lower layer conductor wires are twisted together, an insulating tape is applied vertically on top of that, and the upper layer conductor wires are further twisted on top of that. There is. However, this method has the disadvantage that the insulating tape is torn during vertical forming, and since the distance from the vertically applied roll to the upper drawing nozzle is long, the vertically applied insulating tape has a short distance from the vertically applied roll to the upper drawing nozzle. The drawback was that it opened in between.

(Objective of the Invention) The present invention eliminates the above-mentioned drawbacks of the conventional power cable split conductor stranding device, has a good space factor, does not tear the insulating tape during vertical splicing, and has a vertically spliced insulating tape. It is an object of the present invention to provide a twisting device for power cable conductor strands that does not open.

(Summary of the Invention) The power cable conductor strand twisting device of the present invention twists the lower layer conductor strands by the lower layer twisting device, winds an insulating tape on the lower layer strands by the upper layer twisting device, and also winds the winding. The main feature is that the upper layer conductor wires are twisted on the insulating tape wound layer with the same twisting pitch as the twisting pitch, and then formed and wound.

(Embodiments of the Invention) Hereinafter, embodiments of the present invention will be described with reference to FIG.

In FIG. 2, the power cable conductor strand twisting device includes a first layer twisting device 4 that twists the first layer conductor strands 1a onto the center conductor strand C, and an insulating tape 2 on the lower layer strand 1. a second layer twisting device 5 which twists the second layer conductor strands 3a on the wound layer 2 of the insulating tape 2' with a twisting pitch equal to the winding pitch of the insulating tape 2'; It consists of a forming device 6 that forms the conductor W obtained from the two-layer twisting device into a sector-shaped cross section, and a winding device 7 that winds up the formed conductor W'.

The first layer twisting device 4 includes a feeder bobbin 4a for feeding the conductor wire C, a bobbin 4b for feeding the first layer conductor wire, and a bobbin mount (not shown) for supporting these bobbins. ), a rotating hollow shaft 4C that is fixed to these bobbin mounts and passes the conductive wire C through it, a drive device (not shown) that rotates this shaft, and a collective batten that passes the conductor wires C and 1a through the holes. 4d, and a diaphragm 4e for squeezing these conductor strands passed through this batten into a circular cross section.

The second layer twisting device 5 includes a tape winding head 5a that wraps two sheets of insulating tape 2' on the first layer strands by lap winding or the like, and a tape winding head 5a that is fixed at the entrance end and passes through the first layer strands. rotating hollow shaft 5
b, a drive device (not shown) for rotating this shaft, a bobbin mount (not shown) fixed to the shaft 5b, and a second bobbin mount supported by these bobbin mounts.
A bobbin 5c for feeding layer conductor wires, a collective batten 5d for passing the center and first layer stranded wires and second layer conductor wires 3a through holes, and a conductor wire passing through this batten to have a circular cross section. It is equipped with a diaphragm cap 5e for squeezing.

The tape winding head 5a has a tape pad T
and a tape guide G for guiding the insulating tape 2' from the tape pad between the lower layer strands and the upper layer strands.

Next, when using the power cable conductor strand twisting device of the present invention, the center and first layer conductor strands are fed from the bobbins 4a and 4b, and the bobbin mount of the bobbin 4b is placed around the center conductor C. Rotate in one direction, pass the six first-layer conductor strands through the gathering plate 4d, squeeze them into a circular cross section with the diaphragm cap 4e, and then wrap two pieces of insulating tape 2' around the tape-wrapped bed 5a. Then, while winding the first layer conductor wire in the opposite direction, the bobbin mount of the bobbin 5c is simultaneously rotated in the opposite direction around the first layer conductor wire, and the second layer conductor wire is wound on the first layer conductor wire in the opposite direction.
Twist the layered conductor wires together. Thereafter, the stranded conductor W thus obtained is formed into a fan-shaped cross section by the forming device 6, and the formed conductor W' is wound up by the winding device 7.

(Effects of the Invention) In the power cable conductor strand twisting device of the present invention, the lower layer twisting device twists the lower layer conductor strands, the upper layer twisting device winds an insulating tape on the lower layer strands, and insulates the wires. The upper layer conductor strands are twisted on the wound layer of the tape with a twisting pitch equal to the twisting pitch, the twisted conductor obtained from the upper layer twisting device is formed by a forming device, and the formed conductor is wound by a winding device. Since it is removed, the insulating tape will not be torn during vertical splicing molding, and the vertically spliced insulating tape will not open. In addition, when the tape winding head is fixed to a rotating hollow shaft, the rotational force of this shaft is utilized, so there is no need to install a dedicated power unit for the tape winding device, and the space for the power cable conductor stranding device is saved. The factor gets better.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a segment with a circular cross section;
The figure is an explanatory diagram of an embodiment of the present invention. 4... First layer twisting device, 5... Second layer twisting device, 6... Molding device, 7... Winding device.

Claims (1)

[Scope of Claims] 1. A lower layer twisting device for twisting lower layer conductor strands, an insulating tape wound on the lower layer strands, and a twisting pitch equal to the pitch on the wound layer of the insulating tape. A power cable comprising: an upper layer twisting device for twisting upper layer conductor strands; a forming device for forming the twisted conductor obtained from the upper layer twisting device; and a winding device for winding the formed conductor. A device for twisting conductor wires. 2. A rotating hollow shaft that rotates around the lower layer strands through which the upper layer twisting device passes; a tape winding head fixed near the inlet end of the shaft for winding an insulating tape on the lower layer strands; A fixed bobbin mount, bobbins supported by these bobbin mounts, a collective batten through which lower layer stranded wires and upper layer conductor strands wrapped with insulating tape are passed, and an upper layer conductor element passed through this collective batten. 2. The device for twisting conductor strands of a power cable according to claim 1, further comprising a diaphragm for squeezing the wire.