JP4166374B2 - Repair tool for wire insulation resin pipe and repair method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a repair tool and a repair method for a resin tube for electric wire insulation used in hot wire work.
[0002]
[Prior art]
When performing hot-wire work such as a high-voltage cable, as shown in FIG.
[0003]
The insulating resin tube 1 is formed of a flexible polyethylene resin or the like. As shown in FIG. 5, the insulating resin tube 1 includes a closable crack 2 along the longitudinal direction into which the electric wire is inserted, and an anti-rotation collar 3. It has a flange 4 bent at both ends to the outer peripheral side. In order to prevent the crack 2 from coming off from the electric wire, an overlap margin 5 is provided, and the ridge 3 is formed in two layers with the crack 2 in between.
[0004]
At one end of the insulating resin tube 1, a joint 6 made of a flexible polyethylene resin or the like is attached. This joint 6 has a cylindrical portion 7 into which the end of the insulating resin pipe 1 is inserted and a frame portion 8 into which the flange 3 is inserted. As shown in FIG. A stepped portion 9 to be joined is provided. Both ends of the cylindrical portion 7 and the frame portion 8 are expanded outward so that the insulating resin tube 1 can be easily inserted. Usually, the joint 6 is welded and fixed to one end of the insulating resin pipe 1, another insulating resin pipe 1 connected from the other end side is inserted, and the flange 4 is engaged with the step portion 9. , Will be retained.
[0005]
As shown in FIG. 4, when removing the insulating resin tube 1 covering the electric wire, pull the connected one to the near side, remove it from the electric wire through the crack 2 from the end, and then connect the insulating tube One resin pipe 1 is pulled out from the joint 6 one by one. When the insulating resin tube 1 is extracted from the joint 6, the insulating resin tube 1 to be extracted is bent and twisted at the connecting portion, and the cylindrical portion 7 and the frame portion 8 of the joint 6 are expanded and engaged. The kite 4 is pulled out from the step portion 9. The insulating resin tube removed from the electric wire is repeatedly used for another hot wire operation.
[0006]
[Problems to be solved by the invention]
When pulling out the soot of the above-described insulating resin tube, part or all of the soot is often damaged, and the insulating resin tube in which these soot is damaged is treated as industrial waste. The damage rate of this kite is just over 10% in a single hot-line operation, and a considerable number of insulating resin pipes are disposed of nationwide. Most of these insulating resin pipes to be disposed of are damaged only at the part of the flaw, and can be reused if the flaw is regenerated. Therefore, if the insulating resin pipe with damaged flaws can be repaired at low cost, it can greatly contribute to wasteful use of resources and reduction of waste.
[0007]
Then, the subject of this invention is providing the repair tool and repair method which can repair the resin tube for insulation with which the flaw was damaged at low cost.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, a repair tool for a resin tube for electric wire insulation according to the present invention is a mold having an annular groove into which an end of a resin tube for electric wire insulation from which a damaged flaw has been removed is pressed. This metal mold is a good heat conductor, and a connecting portion with a heat source is provided in this mold, and the dimensions of the annular groove are approximately equal to the inner diameter of the wire insulation resin tube, and the width is a resin tube for wire insulation. It is formed so as to be twice or more the thickness, and a structure in which the surface of the annular groove is coated with a fluororesin is employed.
[0009]
That is, the inner diameter of the insulating resin pipe from which the wrinkles are removed is fitted, and a mold having an annular groove whose width is at least twice the thickness of the insulating resin pipe is connected to a heat source so that the temperature can be raised. The end of the insulating resin tube made of a thermoplastic resin such as resin is pressed into the annular groove to be softened and bent to the outer peripheral side of the insulating resin tube so that a new ridge can be formed. I made it. The reason why the surface of the annular groove is coated with the fluororesin is to facilitate the release of the end of the insulating resin pipe formed with the flange.
[0010]
A taper is provided on the inner diameter side surface of the annular groove so that the groove width is narrowed toward the groove bottom, and the inner diameter of the upper edge of the annular groove to which the taper is provided is approximately equal to the inner diameter of the resin tube for electric wire insulation. The end portion of the softened insulating resin tube can be smoothly bent along the inner diameter side surface, the bottom surface and the outer diameter side surface of the annular groove to the outer peripheral side, and the inner periphery of the end portion where the ridge is formed It is possible to prevent burrs from occurring on the surface.
[0011]
In addition, the method for repairing a resin tube for electric wire insulation according to the present invention is to remove a damaged end portion of the resin tube for electric wire insulation and connect the end portion of the resin tube for electric wire insulation from which the end portion is removed to a heat source. The temperature of the repair tool that has been heated is pressed and inserted into the annular groove to soften the end portion of the resin tube for electric wire insulation inserted into the annular groove, and the softened end portion is the inner diameter side surface of the annular groove, A new ridge is formed at the end of the resin tube for electric wire insulation by bending along the bottom surface and the outer diameter side surface to the outer peripheral side of the electric wire insulation resin tube. A method is adopted in which the end of the insulating resin tube is extracted from the annular groove and cooled.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 shows a wire insulation resin pipe repair tool 10 of the present invention and a solder iron base 11 as a heat source. The repair tool 10 includes a cylindrical mold portion 13 having an annular groove 12 on the upper end surface, and a rod-shaped heat source connection portion 14 integrally formed on the lower end surface of the mold portion 13. Is provided with a hole 15 for inserting a thermometer. The repair tool 10 is made of steel, and the upper end surface of the mold part 13 and the annular groove 12 are coated with a fluororesin 16 to facilitate release, as shown in FIG. ing. In the repair tool 10, the mold part 13 is heated by inserting the heat source connection part 14 into the soldering cylinder 17 of the soldering iron base 11.
[0013]
Hereinafter, the procedure for repairing the resin tube 1 for electric wire insulation using the repair tool 10 will be described. First, as shown by a one-dot chain line in FIG. 2A, the damaged ridge 4 is removed from the end portion of the insulating resin tube 1 and the end portion is obstructed when inserted into the annular groove 12 of the repair tool 10. Cut out part of the ridge 3 so that it does not become. Some insulating resin pipes 1 have already lost the ridges 4. When the fractured surface after the trough 4 has dropped off is extremely rough, it is desirable to cut off the portion of the fractured surface.
[0014]
Next, as shown in FIG. 2 (b), the heat source connection portion 14 of the repair tool 10 is inserted into the scissor tube 17 of the solder scissors base 11, and the mold portion 13 is heated. When the insulating resin tube 1 is made of polyethylene resin, the temperature rising temperature of the mold part 13 is preferably about 200 ° C.
[0015]
After that, as shown in FIG. 2 (c), a thermometer 18 is inserted into the hole 15 of the mold part 13, and it is confirmed that the mold part 13 is heated to an appropriate temperature. The end of the tube 1 is pressed into the annular groove 12. The inner diameter of the annular groove 12 is substantially equal to the inner diameter of the insulating resin tube 1, and the width of the annular groove 12 is formed to be slightly more than twice the thickness of the insulating resin tube 1. Each taper is provided so that the width becomes narrower toward the groove bottom.
[0016]
The end of the insulating resin tube 1 to be pressed and inserted into the annular groove 12 is heated and softened, bent to the outer peripheral side along the inner diameter side surface, groove bottom and outer diameter side surface of the annular groove 12, and newly Nails 4a are formed.
[0017]
Finally, by removing the end of the insulating resin tube 1 formed with the new flange 4a from the annular groove 12 and cooling it, the new flange 4a is regenerated as shown in FIG. The resin tube 1 can be obtained.
[0018]
In the embodiment described above, the repair tool is made of steel, but it may be a good heat conductor and may be formed of a metal or alloy such as aluminum or copper. In this embodiment, a solder iron base is used as a heat source for the repair tool, and a rod-like heat source connecting portion is inserted into the solder base, but the heat source can raise the temperature of the repair tool to about 200 ° C. Any heat source other than electric heat, such as superheated steam, may be used.
[0019]
【The invention's effect】
As described above, the wire insulation resin pipe repair tool and repair method according to the present invention are fitted with the inner diameter of the insulation resin pipe from which wrinkles are removed, and the width is more than twice the thickness of the insulation resin pipe. Then, a mold having an annular groove coated with a fluororesin is connected to a heat source so that the temperature can be raised, and an end of an insulating resin tube formed of a thermoplastic resin such as polyethylene resin is inserted into the annular groove. By pressing and softening and bending to the outer periphery side of the insulating resin tube, a new ridge is formed, so that the insulating resin tube with damaged ridges can be repaired at low cost, and wasteful use of resources This can greatly contribute to the reduction of waste.
[Brief description of the drawings]
1 is an external perspective view showing a repair tool of the embodiment and its heat source. FIG. 2 a, b, and c are partial cuts showing a procedure for repairing an insulating resin pipe using the repair tool of FIG. FIG. 3 is an external perspective view showing an end portion of an insulating resin pipe repaired by the method of FIG. 2. FIG. 4 is an external perspective view showing a state in which the insulating resin pipe is attached to an electric wire in a hot wire operation. 5 is a partially omitted external perspective view showing the insulating resin pipe and joint of FIG. 4. FIG. 6 is a cutaway front cross-sectional view showing the connecting portion of the insulating resin pipe and joint of FIG.
DESCRIPTION OF SYMBOLS 1 Insulation resin pipe 2 Crack 3 鰭 4, 4a 鍔 5 Overlap allowance 6 Joint 7 Tube part 8 Frame part 9 Step part 10 Repair tool 11 Solder iron base 12 Annular groove 13 Mold part 14 Heat source connection part 15 Hole 16 Fluororesin 17 Cylinder 18 Thermometer

Claims (3)

Forming a mold having an annular groove into which the end of the wire insulation resin tube from which the damaged wrinkles have been removed is pressed and inserted with a metal that is a good conductor of heat, and providing a connecting portion with a heat source in the mold, The annular groove is dimensioned so that the inner diameter is approximately equal to the inner diameter of the wire insulating resin tube and the width is more than twice the thickness of the wire insulating resin tube, and the surface of the annular groove is coated with fluororesin. Repair tool for insulated resin pipes. A taper is provided on the inner diameter side surface of the annular groove so that the groove width becomes narrower toward the groove bottom, and the inner diameter of the upper end edge of the annular groove to which the taper is provided is substantially equal to the inner diameter of the resin tube for electric wire insulation. Item 2. A tool for repairing a resin pipe for electric wire insulation according to Item 1. 3. The repair according to claim 1, wherein the damaged end portion of the resin tube for electric wire insulation is removed, and the end portion of the electric wire insulation resin tube from which the electric wire is removed is connected to a heat source and heated. Pressing and inserting into the annular groove of the tool, the end of the resin tube for electric wire insulation inserted into the annular groove is softened, and the softened end is sequentially aligned with the inner diameter side surface, the bottom surface and the outer diameter side surface of the annular groove. Then, by bending the outer periphery side of the resin tube for electric wire insulation, a new ridge is formed on the end portion of the resin tube for electric wire insulation, and the end portion of the electric wire insulation resin tube on which the new ridge is formed is formed. A method for repairing a resin tube for electric wire insulation that is cooled by removing it from an annular groove.

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