JP2013027192A - Tool and method for removing insulation film of element wire insulation conductor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool and a method for removing an insulation film of element wire with insulation film which can remove the insulation film of the element wire with insulation film efficiently.SOLUTION: A tool for removing insulation film which removes an insulation film 12a from each element wire 12 with insulation film of an element wire insulation conductor led out at the connection end of a power cable 10, comprises a flexible shaft 21 which is bendable according to the shape of the element wire 12 with insulation film and has an inside with hollow shape in which the element wire 12 with insulation film can be inserted, and removal means 33 which is attached to the tip of the flexible shaft 21 and which removes the insulation film 12a of the element wire 12 with insulation film by coming into contact with the insulation film 12a of the element wire 12 with insulation film and moving in a sliding manner.

Description

  The present invention relates to an insulation film removing tool and an insulation film for removing an insulation film of each strand with an insulation film that constitutes a wire insulation conductor led out from a connection end of a large-capacity power transmission cable (power cable). It relates to a removal method.

  Conventionally, in order to transmit large-capacity electric power, a power transmission cable (hereinafter referred to as a power cable) made of a wire insulated conductor obtained by twisting a plurality of wires with insulating coatings into a plurality of layers has been used. Each strand constituting the conductor is covered with an insulating film made of enamel or the like in order to reduce power transmission loss due to the skin effect.

  When such a power cable is to be connected, it is necessary to remove the insulation film of each wire with the insulation film of the wire insulation conductor led out at the end portion in order to ensure electrical continuity. This removal operation has been conventionally performed by applying a sandblasting process to the end portion from which the insulating film is to be removed (see, for example, Patent Document 1).

  In addition, in order to increase the removal efficiency of the insulation film, a separation ring is inserted between layers of the insulation film-attached strands, and sandblasting is performed in a state where each strand is opened in the radial direction (for example, , See Patent Document 2).

Japanese Utility Model Publication No. 4-17614 JP-A-5-336634

However, in order to remove the insulating film of the strand with the insulating film by the sandblasting process described above, the following problems have occurred.
(1) The sandblasting time varies depending on the skill of the operator.
(2) A large sandblast apparatus must be brought into the work site where the connection is made, and it is difficult to secure the space.
(3) In order to remove the insulation film having a predetermined length, it is necessary to apply blast powder over a wide range to each element-coated wire of the exposed wire insulation conductor. Further, in order to remove the insulating film up to the root part of the insulated wire, it has been necessary to open the wire with the insulating film of each of the exposed wire insulated conductors in the radial direction to the root part. For this reason, it is necessary to widely open the strands using a separation ring or the like as in the prior art described above, and the work efficiency is poor.
(4) After the insulation film was removed, it was necessary to remove the blast powder remaining between the strands in addition to the removed insulation film powder, resulting in poor work efficiency.
(5) Although it is necessary to return the opening of the wire after the sandblasting process, it takes time to return the opening because the opening angle of the strand is large. Further, the conductor outer diameter after returning (the outer diameter of the bundle of strands) becomes larger than the original outer diameter, and time is required for the drawing work.

  The present invention has been made in view of the above-described circumstances, and an insulation film removing tool and a removal method for an insulation film-attached wire, which can efficiently remove the insulation film of an insulation film-attached element wire as compared with the prior art. Is to provide.

In order to solve the above-mentioned problems, the present invention is an insulation film removal tool for removing an insulation film from each of the wires with an insulation film of a wire insulation conductor that is led out at a connection end of a power cable, A flexible shaft that can be bent in accordance with the shape of the strand with the insulating film and is formed in a hollow shape, and can be inserted through the strand with the insulating film, and attached to the tip of the flexible shaft, It has a removing means for removing the insulating film of the elemental wire with insulation film by sliding and moving in contact with the insulating film of the elemental wire with film.
According to this, it is possible to follow the bent shape of the wire with an insulating film simply by moving the wire with the insulating film in the longitudinal direction, and the insulating film of the wire with the insulating film can be easily removed.

Moreover, the said removal means may be formed in the ring shape which penetrates the said strand with an insulation film.
According to this, the insulating film removal operation can be efficiently performed in a state where the insulating film-coated element wire is surrounded by the removing means by passing the insulating film-coated element wire through the ring-shaped removing means.

Furthermore, you may make it provide the rotation means which rotates the said flexible shaft and the said removal means centering on the centerline of the longitudinal direction of the said flexible shaft.
According to this, the removing means comes into contact with the insulating film while rotating, and the insulating film can be removed more efficiently in a short time.

Moreover, it can also comprise so that the ring-shaped centerline of the said removal means may be eccentric with the centerline of the said flexible shaft.
According to this, the removal means comes to swing and rotate, and the removal means comes into further strong contact with the insulating film. As a result, the insulating film can be removed more efficiently and in a short time.

Furthermore, the ring-shaped inner peripheral surface of the removing means may be formed in a convex shape.
According to this, it becomes easy for the removing means to come into contact with the bending of the wire with the insulating film, and the insulating film can be easily removed even at the portion where the wire with the insulating film is bent. .

Furthermore, the flexible shaft may be constituted by a coil spring.
According to this, the elastic force of the coil spring makes it easy to follow the bending of the strand generated by the opening of the strand with the insulating film, and the removal means can be more reliably sent to the root portion of the strand.

On the other hand, the present invention is a method for removing an insulating film, wherein the insulating film is removed from each wire with an insulating film of a wire insulated conductor that is led out at a connection end of a power cable. A flexible shaft that can be bent in accordance with the shape of the attached wire, and can be inserted into the hollow formed hollow wire, and attached to the tip of the flexible shaft. A hollow portion of the flexible shaft using an insulating film removing tool provided with a polishing section having a removing means for removing the insulating film of the wire with an insulating film by sliding in contact with the insulating film of the wire Inserting the wire with the insulation film into the wire, moving in the longitudinal direction of the wire with the insulation film, and sliding the removal means and the wire with the insulation film to remove the insulation film. And butterflies.
According to this, it is possible to follow the bent shape of the wire with an insulating film simply by moving the wire with the insulating film in the longitudinal direction, and the insulating film of the wire with the insulating film can be easily removed.

In addition, it comprises a rotating means for rotating the flexible shaft and the removing means,
You may make it remove the said insulating film by rotating the said removing means using the said rotation means, slidingly moving the said removal means and the said strand with an insulating film.
According to this, the removing means comes into contact with the insulating film while rotating, and the insulating film can be removed more efficiently in a short time.

  The insulation film removal tool for an insulation film-attached wire according to the present invention can be bent in accordance with the shape of the insulation film-attached element wire, and the insulation-coated element wire can be inserted into a hollow shape formed therein. A flexible shaft, and a polishing part attached to the tip of the flexible shaft and having a removing means for removing the insulating film of the insulated wire by moving in contact with the insulating film of the insulated wire. Since it is provided, it is possible to follow the bent shape of the wire with an insulating film simply by moving the wire with the insulating film in the longitudinal direction, and the insulating film of the wire with an insulating film can be easily removed. In particular, the work time per wire is short, and even if it is considered to remove all the wires with insulation film that have been laid out, the work takes less time than when using the sandblasting method. Can be terminated.

Moreover, since the tool of this invention is a tool provided only with a flexible shaft and a removal means, it is not necessary to bring a large sized apparatus like a sandblast to a connection site, and installation space becomes unnecessary.
Furthermore, when using the sandblasting method, it is sufficient to open the wire with the insulation film of the exposed wire insulation conductor to remove the insulation film as long as it does not hinder the movement of the tool in the longitudinal direction. Compared with, the opening of the wire with insulating film may be small. Therefore, opening work is reduced. Moreover, since the angle which opens an element wire with an insulation film may be smaller than the case where sandblasting is performed, the operation | work which returns the opening of an element wire with an insulation film, and an outer diameter drawing work time are shortened.

  Furthermore, in the case of the sandblasting method, it was necessary to remove the blasting powder that entered between the strands after the sandblasting was completed, but when this tool was used, only the coating powder remaining on the surface of the strand after removal was used. The air can be blown off with air, and the work can be reduced and the work time can be shortened.

  Further, in the insulation film removal method of the wire with insulation film according to the present invention, in order to remove the insulation film from each wire with insulation film of the wire insulation conductor that is led out at the connection end of the power cable, A flexible shaft that can be bent in accordance with the shape of the strand with the insulating film and is formed in a hollow shape, and can be inserted through the strand with the insulating film, and attached to the tip of the flexible shaft, A hollow portion of the flexible shaft using an insulating film removing tool provided with a polishing unit having a removing means for removing the insulating film of the insulated wire by moving in contact with the insulating film of the coated wire The insulation-coated element wire is inserted through, moved in the longitudinal direction of the insulation-coated element wire, and the insulating film is removed by sliding the removing means and the insulation-coated element wire. Runode, it is possible to obtain the same effects as those described above.

It is a schematic diagram which shows the state which has removed the insulating film of the strand with an insulating film using the insulating film removal tool which concerns on embodiment of this invention. It is an expansion outline figure of the insulating film removal tool of FIG. It is an expansion outline figure which shows the state which the insulation film removal tool is bent from the state of FIG. It is an enlarged view of the front-end | tip part of an insulating film removal tool.

Hereinafter, the insulating film removal tool 1 of the strand 12 with an insulating film which concerns on embodiment of this invention is demonstrated in detail using drawing.
FIG. 1 is a schematic diagram showing a state where an enamel insulating film 12a (hereinafter referred to as an insulating film 12a) of an element-coated wire 12 (hereinafter referred to as an element wire 12) is being removed using an insulating film removing tool 1. is there. 2 and 3 are enlarged views of the removed portion of the insulating film removing tool 1, and FIG. 4 is an enlarged view of the polishing portion 30 of the insulating film removing tool.

  As shown in FIG. 1, the power cable 10 is mainly composed of a plurality of strands 12 that face each other in a plurality of layers, and an insulating layer body 11 that covers the outside of the strand insulated conductor formed by the strands 12; It is comprised with the outer jacket 13 which covers the outer side of this insulating layer body 11. At the both ends connecting portion in the longitudinal direction of the power cable 10, the insulating layer body 11 and the jacket 13 described above are removed by a predetermined length, and the plurality of strands 12 are processed in a state of being led out. Yes.

  As shown in FIG. 2 and FIG. 3, the strand 12 is coated with an insulating film 12 a on the entire outer periphery of the core wire 12 b in order to reduce power transmission loss due to the skin effect.

  As shown in FIG. 1, the insulating film removing tool 1 includes a flexible shaft portion 20 into which one element wire 12 is inserted, and a polishing located at a tip portion (left end portion in FIG. 1) of the flexible shaft portion 20. And a general-purpose electric drill 40 attached to the base end portion (the end portion opposite to the tip) of the flexible shaft portion. Further, as shown in FIG. 1, the electric drill 40 is connected to a power source 50 to be supplied with electric power.

  The flexible shaft portion 20 is configured by a long hollow coil spring 21, and the strand 12 can be inserted through the hollow portion along the longitudinal direction of the coil spring 21. As shown in FIG. 3, the coil spring 21 can be freely bent in accordance with the bending shape of the element wire 12 by its own elasticity when the element wire 12 is inserted.

  Further, the inner diameter of the coil spring 21 is formed larger than the outer diameter of the element wire 12, and the center line of the element wire 12 does not coincide with the center line of the coil spring 21 when the element wire 12 is inserted. However, the element wire 12 can be easily inserted into the coil spring 21.

  Further, an attachment shaft 22 for connecting to an electric drill 40 described later is attached to the proximal end portion of the coil spring 21. A stepped portion 22 a is formed at the outer peripheral end of the mounting shaft 22. An inner diameter of the coil spring 21 is fitted and attached to the stepped portion 22a. The coil spring 21 fitted and attached to the stepped portion 22a is firmly fixed by welding or the like.

  As shown in an enlarged view in FIG. 4, the polishing unit 30 includes an attachment fitting 31 for attaching to the distal end portion on the proximal end side of the coil spring 21, and a hollow fitting 32 attached to the distal end portion of the attachment fitting 31. It consists of

  The mounting bracket 31 has a hollow cylindrical shape, and the center line T1 of the hollow portion coincides with the center line T1 (see FIGS. 2 and 3) in the longitudinal direction of the coil spring 21 described above. Further, a step portion 31 a is formed on the outer peripheral edge portion of the mounting bracket 31 on the coil spring 21 side. The tip end portion of the coil spring 21 is fitted and attached to the step portion 31a. The tip end portion of the coil spring 21 fitted and attached to the step portion 31a is firmly fixed by welding.

  The hollow metal fitting 32 is substantially the same as the outer diameter of the attachment fitting, but the center line T2 of the hollow portion is more eccentric than the center line T1 of the attachment fitting. Further, as shown in FIG. 4, a diamond electrodeposition portion 33 is provided in a ring shape on the hollow inner surface of the hollow metal fitting 32. The diamond electrodeposition portion 33 is formed by fixing diamond abrasive grains to the hollow inner surface of the hollow metal fitting 32. The diamond electrodeposition portion 33 is for contacting the insulating film 12a of the element wire 12 during the insulating film removing operation and removing the insulating film 12a by scraping.

  As shown in FIG. 4, the diamond electrodeposited portion 33 is formed in a convex shape having a raised central portion. More specifically, the diamond electrodeposited portion 33 is gently curved and convex toward the center line T2 from both ends of the left end portion 33a and the right end portion 33c toward the center portion 33b. That is, the inner diameter of the diamond electrodeposition portion 33 is the smallest at the central portion 33b.

  The electric drill 40 is a power tool that is generally used, and is manually turned ON / OFF and rotated / stopped by an operator. The above-described attachment shaft 22 is attached to the drill attachment hole 41 of the electric drill 40. Thereby, when the electric drill 40 is turned on, the flexible shaft portion 20 and the polishing portion 30 are rotated.

Next, the action of the insulating film removing tool 1 for the insulating film-attached element wire and the insulating film removing method according to the embodiment of the present invention will be described.
(1) First, as shown in FIG. 1, the operator opens a plurality of strands 12 of the strand insulated conductor that is led out at the connection end of the power cable 10 in the radial direction. The opening operation in the radial direction does not need to be performed until a large distance between the strands 12 is ensured as in the conventional sandblasting process. More specifically, the polishing unit 30 and the flexible shaft unit 20 described above may be opened to the extent that they can be inserted along the longitudinal direction of the strands 12.

  (2) Next, the operator inserts one strand 12 from the tip opening of the polishing portion 30 of the insulating film removing tool 1 and moves the polishing portion 30 to the root of the strand 12. At this time, the tip end portion of the wire 12 is inserted through the polishing portion 30 to the hollow portion of the coil spring 21 of the flexible shaft portion 20.

  (3) Then, the operator rotates the electric drill 40. As a result, the diamond electrodeposition portion 33 of the polishing portion 30 rubs against the insulating film 12 a of the strand 12. Further, since the center line T2 of the polishing portion 30 (center line T2 of the diamond electrodeposited portion 33) is more eccentric than the center line T1 of the coil spring 21, the polishing portion 30 is moved with the rotation of the electric drill 40. Oscillates and rotates. Therefore, the insulating film-attached strand 12 inserted through the polishing portion 30 is likely to rub in the circumferential direction of the strand 12, and the insulating coating 12a of the strand 12 is easily removed.

  (4) The operator moves the electric drill 40 from the root portion to the tip portion along the longitudinal direction of the strand 12 while rotating the electric drill 40. Thereby, the insulating film 12a is removed over the entire length (movement length) in the longitudinal direction by the polishing section 30. In addition, you may perform the operation | work of (2)-(4) by moving the grinding | polishing part 30 to the front-end | tip part of the strand 12, and moving it from a front-end | tip part toward a root part.

  The above (2) to (4) are performed on all the strands 12. Finally, the film powder of the removed insulating film 12a is blown off with air for cleaning. Thereby, all the insulating films 12a can be removed.

  According to the insulation film removing tool 1 for a wire with an insulation film according to the embodiment of the present invention, the insulation film 12a is formed from each of the wires 12 of the wire insulation conductor that is exposed at the connection end of the power cable 10. Insulating film removing tool 1 for removal, which can be bent in accordance with the shape of the wire 12, and is formed in a hollow shape, and a coil spring 21 into which the wire 12 can be inserted, and this coil spring 21 is provided with a diamond electrodeposition portion 33 which is attached to the tip of the wire 21 and removes the insulating coating 12a of the wire 12 by sliding in contact with the wire 12 so that the wire 12 is in the longitudinal direction. It is possible to follow the bent shape of the wire 12 simply by moving the wire 12 to the insulating film 12a of the wire 12 with ease. In particular, the work time per wire is short, and even if it is considered that each wire 12 of the exposed wire insulated conductors is removed, it is shorter than when using the sandblasting method. Work can be completed in time.

Moreover, since this tool 1 is a tool provided only with the coil spring 21 and the diamond electrodeposition part 33, it is not necessary to bring a large sized apparatus like a sandblast to a connection site, and installation space is also unnecessary.
Furthermore, the operation of opening each strand 12 of the bare strand insulated conductor for removing the insulation coating 12a may be performed so long as it does not hinder the movement of the tool 1 in the longitudinal direction. Compared with, the opening of the strand 12 may be small. Therefore, opening work is reduced. Moreover, since the angle which opens the strand 12 may be smaller than the case where sandblasting is performed, the operation | work which returns the opening of the strand 12, and an outer diameter reduction work time are shortened.

  Furthermore, in the case of the sandblasting method, the blasting powder that has entered between the strands 12 after the sandblasting must be removed, but when the tool 1 is used, it remains on the surface of the strands 12 after the removal. It is only necessary to blow off the film powder with air, and the work can be reduced and the work time can be shortened.

  Further, since the diamond electrodeposition portion 33 is formed in a ring shape through which the strand 12 is inserted, passing the strand 12 through the ring-shaped diamond electrodeposition portion 33 causes the entire circumference of the strand 12 to be diamond electrode. It is slid and polished evenly with the landing portion 33. Therefore, the insulating film can be removed efficiently and evenly.

  Further, since the electric drill 40 for rotating the coil spring 21 and the diamond electrodeposition portion 33 is provided around the center line T1 in the longitudinal direction of the coil spring 21, the diamond electrodeposition portion 33 is rotated on the insulating film 12a. Come into contact. For this reason, the insulating film 12a can be removed more efficiently and in a shorter time than when the tool 1 is slid and moved to remove the insulating film 12a.

  Further, since the ring-shaped center line T2 of the diamond electrodeposition portion 33 is eccentric from the center line T1 of the coil spring 21, the diamond electrodeposition portion 33 swings and rotates. As a result, the diamond electrodeposition portion 33 comes into strong contact with the insulating film 12a and evenly comes into contact with the circumferential direction of the strand 12. As a result, the insulating film 12a can be removed more efficiently and in a short time.

  Furthermore, since the ring-shaped inner peripheral surface of the diamond electrodeposition portion 33 is formed in a convex shape, the diamond electrodeposition portion 33 is likely to come into contact with the bending of the wire 12. Thereby, even if it is the part where the strand 12 bends, the insulating film 12a can be easily removed along the bent shape.

As mentioned above, although the insulation film removal tool of the strand with an insulation film which concerns on embodiment of this invention was described, this invention is not limited to above-mentioned embodiment, Various based on the technical idea of this invention Variations and changes can be made.
For example, in the present embodiment, a general-purpose electric drill 40 is used to rotate the polishing unit 30, but the insulating film 12 a is not used without using the electric drill 40 (without rotating the polishing unit 30). You may make it remove. That is, when the power supply 50 to be supplied to the electric drill 40 cannot be secured, or when the insulating film 12a can be easily removed, the polishing unit 30 is moved in the extending direction of the strand 12, so that the polishing unit 30 and the strand are moved. Insulating film 12a can be removed by sliding and polishing 12. According to this, it is possible to provide a cheaper insulating film removing tool without using the electric drill 40.

  Moreover, in this Embodiment, although the flexible shaft part 20 is comprised with the coil spring 21, it is not limited to this. That is, a general flexible tube or the like may be used as long as it can be bent freely along the bent shape of the wire 12.

  Furthermore, in the present embodiment, the polishing portion 30 is configured by fixing diamond abrasive grains in a ring shape on the hollow inner surface of the hollow metal fitting 32. However, the polishing portion 30 may be provided in an arc shape, for example. There may be. That is, when polishing is performed by sliding the polishing unit 30 without rotating, the polishing unit 30 may be provided only in an arc shape.

Furthermore, in the present embodiment, diamond abrasive grains are used, but other abrasive grains can also be used. That is, any material that can remove the insulating film may be used. For example, CBN abrasive grains may be used.
Further, the removing means of the present invention may have a wave that hits the insulating film 12a of the wire 12 and scrapes it off.

  Furthermore, in the present embodiment, the electric drill 40 is used as the rotating means. However, as long as the flexible shaft portion 20 and the polishing portion 30 can be given rotational power, other tools using an electric motor may be used. It doesn't matter.

1 Insulation film removal tool 10 Power cable 11 Insulation sheath 12 Wire with insulation film (element wire)
12a Enamel insulation film (insulation film)
12b Core wire 13 Outer sheath 20 Flexible shaft portion 21 Coil spring (flexible shaft)
22 Mounting shaft 22a Stepped portion 30 Polishing portion 31 Mounting bracket 31a Stepped portion 32 Hollow bracket 33 Diamond electrodeposition portion (removing means)
33a Left end portion 33b Center portion 33c Right end portion 40 Electric drill (rotating means)
41 Drill mounting hole 50 Power supply

Claims (8)

An insulation film removal tool for removing the insulation film from each wire with an insulation film of the wire insulation conductor that is led out at the connection end of the power cable,
A flexible shaft that can be bent in accordance with the shape of the strand with the insulating film, and that can be inserted through the strand with the insulating film formed therein,
The flexible shaft is attached to the tip of the flexible shaft, and has a removing means for removing the insulating film of the insulated wire by sliding in contact with the insulating film of the insulated wire. Insulating film removal tool.   2. The insulating film removing tool according to claim 1, wherein the removing means is formed in a ring shape through which the strand with the insulating film is inserted.   The insulating film removing tool according to claim 2, further comprising a rotating unit that rotates the flexible shaft and the removing unit around a center line in a longitudinal direction of the flexible shaft.   The insulating film removing tool according to claim 3, wherein a ring-shaped center line of the removing means is eccentric from a center line of the flexible shaft.   The insulating film removing tool according to claim 3 or 4, wherein a ring-shaped inner peripheral surface of the removing means is formed in a convex shape.   The said flexible shaft is comprised with the coil spring, The insulation film removal tool as described in any one of Claims 1-5 characterized by the above-mentioned. In order to remove the insulation film from each of the insulated wire with the insulated wire that is led out at the connection end of the power cable, it can be bent in accordance with the shape of the insulated wire and has a hollow shape. A flexible shaft through which the wire with insulation film can be inserted, and a flexible shaft attached to the tip of the flexible shaft, and in sliding contact with the insulation film of the wire with insulation film Using an insulation film removal tool equipped with a removal means for removing the insulation film of the wire with insulation film,
Insert the wire with insulation film through the hollow portion of the flexible shaft,
A method for removing an insulating film, wherein the insulating film is moved by moving in a longitudinal direction of the element-coated wire, and the removing means and the element-coated wire are slid to remove the insulating film. Rotating means for rotating the flexible shaft and the removing means,
8. The insulating film according to claim 7, wherein the insulating film is removed by rotating the removing means using the rotating means while slidingly moving the removing means and the wire with the insulating film. Removal method.

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