JP2021005958A - Coating processing tool - Google Patents

Abstract

To provide a coating processing tool capable of easily performing termination processing of a power cable.SOLUTION: A coating processing tool is a coating processing tool for termination processing of a power cable, and has an extractable tubular hollow expanded diameter retention member and an elastic tubular member coating the power cable. A part of one end side in an axial direction of the elastic tubular member is retained in a state where it is expanded to an outer peripheral side of the expanded diameter retention member, and the other part of the other end side in the axial direction of the elastic tubular member protrudes in the axial direction from the end part of the expanded diameter retention member.SELECTED DRAWING: Figure 2

Description

One aspect of the present invention relates to a coating treatment tool.

Conventionally, as a coating treatment tool for termination treatment for terminating a power cable, the one described in Patent Document 1 is known. This coating treatment tool includes a tubular hollow elastic tubular member. When terminating the power cable, the operator inserts the end of the power cable into the elastic tubular member. As a result, the end of the power cable is covered with an elastic tubular member.

Japanese Unexamined Patent Publication No. 2012-130235

Here, in the above-mentioned covering treatment tool, the inner diameter of the portion of the elastic tubular member that covers the insulating portion of the power cable is smaller than the outer diameter of the insulating portion. Therefore, the operator needs to firmly insert the power cable into the elastic tubular member, which requires a large insertion force. Therefore, it may not be possible to successfully cover the power cable with the elastic tubular member without using grease or the like. On the other hand, the entire area of the elastic tubular member is expanded by the diameter expansion holding member, the power cable is passed through the inside of the diameter expansion holding member, and the diameter expansion holding member is disassembled, so that the end of the power cable is elastically annular. There is a method of covering with a member. However, with such a method, it is difficult to position the covering treatment tool with respect to the power cable. If the positioning is incorrect, the elastic tubular member contracts and comes into close contact with the power cable, so that the work cannot be redone. As described above, in this method, it may be difficult to accurately align the elastic tubular member and the power cable. From the above, there has been a demand for a coating treatment tool capable of easily terminating the power cable.

The coating treatment tool according to one embodiment of the present invention is a coating treatment tool for terminating a power cable, and includes a pullable tubular hollow diameter-expanding holding member and an elastic tubular member that covers the power cable. , A part of the elastic tubular member on one end side in the axial direction is held in a state of being expanded to the outer peripheral side of the diameter expansion holding member, and the other part of the elastic tubular member on the other end side in the axial direction is expanded in diameter. It protrudes in the axial direction from the end of the holding member.

According to one embodiment of the present invention, the termination process of the power cable can be easily performed.

It is a side view which shows the coating treatment tool which concerns on embodiment of this invention. FIG. 2A is a side view showing an elastic tubular member in a contracted state, and FIG. 2B is a cross-sectional view of a coating treatment tool. It is sectional drawing which shows the electric power cable after terminating with a coating treatment tool. It is a figure which shows the work procedure at the time of performing the termination processing of a power cable with a coating processing tool.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or equivalent elements are designated by the same reference numerals, and duplicate description is omitted.

FIG. 1 is a side view showing a coating treatment tool 1 according to an embodiment of the present invention. FIG. 2A is a side view showing the elastic tubular member 2 in the contracted state. FIG. 2B is a cross-sectional view of the covering treatment tool 1. FIG. 3 is a cross-sectional view showing the power cable 100 after the termination treatment is performed by the covering treatment tool 1.

The covering treatment tool 1 is a member for termination treatment for terminating the power cable 100. The termination process is to protect the termination structure of the power cable 100 by providing the elastic tubular member 2 with respect to the termination structure in which the internal components are exposed from the cable sheath 105 which is the outermost layer. It is a process.

Here, the termination structure of the power cable 100 to be terminated will be described with reference to FIG. The power cable 100 includes an insulating portion 102, a semi-conductive layer 103, a shielding layer 104, a cable sheath 105, and a grounding portion 106. The insulating portion 102 is made of an insulating resin or the like, and covers the outer peripheral surface of the conductor 101. The semi-conductive layer 103 is made of, for example, conductive polyethylene or the like, has semi-conductive properties, and covers the outer peripheral surface of the insulating portion 102. The shielding layer 104 covers the outer peripheral surface of the semi-conductive layer 103. The cable sheath 105 covers the outer peripheral surface of the shielding layer 104. The grounding portion 106 is a ring-shaped conductive member attached to the shielding layer 104. A grounding wire 51 connected to an external grounding point is drawn out from the grounding portion 106. The grounding portion 106 and the shielding layer 104 are in the ground state via the grounding wire 51.

In the terminal structure of the power cable 100, the insulating portion 102, the semi-conductive layer 103, the shielding layer 104, and the cable sheath 105 are exposed to the outside in this order when viewed from the tip 100a. A grounding portion 106 is attached to the portion of the shielding layer 104. The insulating portion 102 extends in an axially longer state than the semi-conductive layer 103 and the shielding layer 104.

Next, the configuration of the covering treatment tool 1 will be described. As shown in FIGS. 1 and 2B, the covering treatment tool 1 includes an elastic tubular member 2 and a diameter-expanding holding member 3. The covering treatment tool 1 is configured by holding a part of the elastic tubular member 2 in the axial direction D1 in a state of being enlarged by the diameter-expanding holding member 3. The covering treatment tool 1 covers the power cable 100 from the tip 100a.

The elastic tubular member 2 is a member for covering the power cable 100. The elastic tubular member 2 is a hollow tubular member having an annular cross-sectional shape and extending along the central axis CL1. The elastic tubular member 2 is made of an elastic material that can expand and contract in the radial and axial directions. As the elastic material, for example, ethylene propylene rubber, silicone rubber and the like are adopted.

The direction in which the central axis CL1 of the elastic tubular member 2 extends is defined as the axial direction D1. Further, in each figure, an arrow is attached to the relative moving direction of the covering treatment tool 1 with respect to the power cable 100 at the time of covering treatment. The elastic tubular member 2 has an upstream end portion 2a in the axial direction D1 and a downstream end portion 2b. The upstream side of the axial direction D1, that is, the end portion 2a side corresponds to the "one end side in the axial direction" in the claim. The downstream side of the axial direction D1, that is, the end portion 2b side corresponds to the "other end side in the axial direction" in the claim.

The enlarged diameter holding member 3 is a hollow tubular member that can be pulled out. The diameter-expanded holding member 3 holds a part of the elastic tubular member 2 in the axial direction D1 in a expanded state. The diameter-expanding holding member 3 is, for example, a cylindrical tubular hollow member having a dismantling line 21 formed on a wall surface over the entire length. The central axis of the enlarged diameter holding member 3 is arranged so as to coincide with the central axis CL1 of the elastic tubular member 2. The dismantling line 21 is provided so as to orbit around the axis of the diameter-expanding holding member 3 or to gradually advance in the axial direction D1 while orbiting and reversing. In the present embodiment, the dismantling line 21 is provided with a continuous spiral groove provided so as to gradually advance in the axial direction D1 while rotating around the axis of the diameter-expanding holding member 3. The portion where the continuous spiral groove is formed has a smaller thickness than the periphery of the continuous spiral groove and is easily broken. Therefore, the diameter-expanding holding member 3 can be pulled out as a core ribbon 22 which is a string-like body along the continuous spiral groove. As the material of such an enlarged diameter holding member 3, for example, a resin such as polyethylene or polypropylene is used. Further, the dismantling line 21 is not limited to a form formed in a spiral shape such as a continuous spiral groove, and may be formed in an SZ shape, for example, and may have any shape as long as it can be pulled out.

Here, the configuration of the elastic tubular member 2 in the contracted state will be described with reference to FIGS. 2A and 3. The elastic tubular member 2 has a first region E1, a third region E3, and a second region E2 in this order from the upstream side to the downstream side in the axial direction D1.

The first region E1 is a region formed on the end portion 2a side in the axial direction D1. The first region E1 extends from the end portion 2a toward the downstream side in the axial direction D1 by a predetermined distance. The first region E1 is a region that covers the insulating portion 102 and the semi-conductive layer 103 in the covered state of the power cable 100. An electric field relaxation layer 4 is formed on a part of the inner peripheral surface of the first region E1. The electric field relaxation layer 4 is a layer that relaxes the electric field concentrated on the tip of the cable shielding layer when energized. As the material of the electric field relaxation layer 4, for example, a material having an appropriate dielectric constant (for example, a relative permittivity of 6 or more) is used, and a rubber-like material (silicone rubber, ethylene propylene rubber, etc.) or a putty material (silicone-based) is used. Etc. are adopted. By providing the electric field relaxation layer 4, it can be suitably used for the termination treatment of the high voltage (for example, 6600 V or more) power cable 100.

The second region E2 is a region formed on the end portion 2b side in the axial direction D1. The second region E2 extends from the end 2b toward the upstream side in the axial direction D1 by a predetermined distance. The second region E2 covers the grounding portion 106, the shielding layer 104, and the cable sheath 105 in the covered state of the power cable 100. When the elastic tubular member 2 is contracted, the second region E2 has a larger diameter than the first region E1. That is, when the elastic tubular member 2 is contracted, the first region E1 has a larger diameter than the second region E2. Specifically, the inner diameter R2 of the second region E2 is larger than the inner diameter R1 of the first region E1 at the time of contraction. The inner diameter R1 is smaller than the outer diameter of the insulating portion 102 of the power cable 100. The inner diameter R2 is larger than the insulating portion 102 of the power cable 100. The inner diameter R2 may be smaller than the outer diameter of the cable sheath 105 of the power cable 100, but may be the same diameter or slightly larger. How different the inner diameters R1 and R2 are is not particularly limited, and is appropriately changed depending on the difference in diameter between the insulating portion 102 and the cable sheath 105. For example, the inner diameter R2 is different from the inner diameter R1. It may be about 5% to 500% larger.

In the axial direction D1, a ring portion 11 is formed at a portion of the second region E2 near the end portion 2b. The ring portion 11 is a portion where the wall thickness is partially larger than the wall thickness of the other region of the second region E2. The ring portion 11 projects from the inner surface and the outer peripheral surface of the elastic tubular member 2 and extends around the central axis CL1 over the entire circumference. As a result, the ring portion 11 has a ring-like shape that surrounds the central axis CL1. The inner diameter of the ring portion 11 is smaller than the outer diameter of the cable sheath 105. When the cable sheath 105 is covered with the second region E2, the ring portion 11 presses the outer peripheral surface of the cable sheath 105. As a result, the ring portion 11 can enhance the sealing property between the elastic tubular member 2 and the cable sheath 105. In the present embodiment, the ring portion 11 is formed in two, but may be one or three or more.

The third region E3 is a region formed between the first region E1 and the second region E2 in the axial direction D1. The third region E3 extends so as to be inclined between the first region E1 and the second region E2 having different diameters from each other. The diameter of the third region E3 increases toward the downstream side in the axial direction D1. The third region E3 covers the shielding layer 104 exposed on the upstream side in the axial direction D1 from the grounding portion 106 in the covered state of the power cable 100.

Next, with reference to FIG. 2B, which portion of the elastic tubular member 2 is held by the diameter-expanding holding member 3 will be described in detail. A part of the elastic tubular member 2 on the one end side (end portion 2a side) in the axial direction D1 is held in a state of being expanded to the outer peripheral side of the diameter expansion holding member 3. The term "a part of the elastic tubular member on one end side in the axial direction" refers to an end portion 2a on the upstream side in the axial direction D1 and a portion in a predetermined range on the downstream side in the axial direction D1 from the end portion 2a. .. Of the elastic tubular member 2, the inner diameter R3 of the portion held by the diameter-expanding holding member 3 is at least larger than the inner diameter R1 of the first region E1 at the time of contraction. Further, the inner diameter R3 is larger than the inner diameter R2 of the second region E2. However, the inner diameter R3 may be at least larger than the inner diameter R1 and may be the same as the inner diameter R2 or smaller than the inner diameter R2.

The other portion of the elastic tubular member 2 on the other end side (end portion 2b side) in the axial direction D1 protrudes from the end portion 3b of the diameter expansion holding member 3 in the axial direction D1. The end portion 2b of the elastic tubular member 2 is arranged on the downstream side in the axial direction D1 with respect to the end portion 3b of the diameter-expanding holding member 3. That is, the other portion of the elastic tubular member 2 on the other end side (end portion 2b side) in the axial direction D1 is in a contracted state without being expanded in diameter. The "other portion of the elastic tubular member on the other end side in the axial direction" refers to the end portion 2b on the downstream side in the axial direction D1 and the portion in a predetermined range on the upstream side in the axial direction D1 from the end portion 2b. Shown. As described above, since the "other portion of the elastic tubular member on the other end side in the axial direction" includes the end portion 2b, the elastic tubular member 2 is expanded in diameter at the portion of the end portion 2b. It is in the state at the time of contraction without any.

In the present specification, when it is expressed that "the other portion of the elastic tubular member on the other end side in the axial direction protrudes in the axial direction from the end portion of the diameter expansion holding member", "the diameter expansion holding member The “end portion” means an end portion existing on the most downstream side in the axial direction D1 when viewed as the covering treatment tool 1 as a whole. For example, the diameter expansion holding member 3 may be divided into a plurality of members in the axial direction D1. In that case, of the plurality of diameter-expanding holding members 3, the end portion 3b of the diameter-expanding holding member 3 arranged on the most downstream side in the axial direction D1 becomes the above-mentioned "end portion of the diameter-expanding holding member". Applicable. Therefore, for example, as a comparative example, the diameter-expanding holding member is not provided in a predetermined range from the end portion 3b of the diameter-expanding holding member 3 to the downstream side in the axial direction D1, and another portion near the end portion 3b and the end portion 2b is provided. In a configuration in which the diameter-expansion holding member is provided, the end of the other diameter-expansion holding member on the downstream side in the axial direction D1 corresponds to the above-mentioned "end of the diameter-expansion holding member". In the configuration of the comparative example, the end portion 2b of the elastic tubular member 2 is expanded in diameter by another diameter-expanding holding member, and does not correspond to the state of "protruding axially from the end portion of the diameter-expanding holding member".

Of the regions of the elastic tubular member 2, at least the first region E1 is held by the diameter-expanded holding member 3 in a expanded state. Specifically, the end portion 3a on the upstream side in the axial direction D1 of the diameter-expanding holding member 3 is arranged on the upstream side in the axial direction D1 with respect to the end portion 2a of the elastic tubular member 2. A part of the diameter-expanded holding member 3 near the end 3a protrudes from the elastic tubular member 2 and is exposed. The end portion 3b on the downstream side in the axial direction D1 of the enlarged diameter holding member 3 is arranged on the boundary portion between the first region E1 and the third region E3, or on the downstream side in the axial direction D1 from the boundary portion. Will be done. As a result, the entire area of the first region E1 whose diameter becomes smaller when contracted is held in a state of being expanded by the diameter expansion holding member 3.

Further, in the embodiment, the end portion 3b of the enlarged diameter holding member 3 extends to an intermediate position in the axial direction D1 in the second region E2. That is, the end portion 3b extends to the downstream side in the axial direction D1 from the boundary portion between the third region E3 and the second region E2. As a result, the diameter-expanding holding member 3 holds the entire area of the first region E1 and the third region E3, and further holds a part of the second region E2 on the upstream side in the axial direction D1. In this portion, the elastic tubular member 2 of the second region E2 is expanded from the inner diameter R2 to the inner diameter R3. The elastic tubular member 2 of the first region E1 is expanded from the inner diameter R1 to the inner diameter R3. The enlarged diameter holding member 3 receives a compressive force toward the inner peripheral side because the elastic tubular member 2 tends to contract. In the second region E2, the inner diameter R2 at the time of contraction is larger than the inner diameter R1 of the first region E1, so that the compressive force acting on the diameter-expanding holding member 3 in the second region E2 is the first region E1. Smaller than

Next, with reference to FIG. 4, a method of covering the power cable 100 with the covering treatment tool 1 described above will be described. FIG. 4 is a diagram showing a work procedure when terminating the power cable 100 with the covering treatment tool 1. In the following description, the covering treatment tool 1 is moved so as to be close to the power cable 100, but the movement of the power cable 100 and the covering treatment tool 1 may be relative, and the power cable may be moved. The 100 may be moved so as to be close to the coating treatment tool 1.

First, as a first step, a process of forming a terminal structure of the power cable 100 is performed. That is, the insulating portion 102, the semi-conductive layer 103, and the shielding layer 104 are exposed from the power cable 100 by a predetermined length in order from the tip of the power cable 100. The layer 103, the shielding layer 104, and the cable sheath 105 are stripped off in a stepped manner. As a result, the preliminary preparation of the power cable 100 is completed.

Subsequently, in the next step, the covering treatment tool 1 is put on the power cable 100 having the terminal structure formed (see FIG. 4A). At this time, the operator moves the covering treatment tool 1 from the upstream side to the downstream side in the axial direction D1 so that the end portion 2b of the elastic tubular member 2 of the covering treatment tool 1 approaches the power cable 100. Then, the operator inserts the grounding portion 106 and the cable sheath 105 into the second region E2 of the elastic tubular member 2 of the covering treatment tool 1 in order from the tip end side of the power cable 100, so that the covering treatment tool 1 is inserted. Cover with 1. At this time, the portion near the tip of the power cable 100 (insulating portion 102) is inserted inside the diameter-expanding holding member 3. The operator moves the covering treatment tool 1 to a position where the second region E2 can cover the cable sheath 105 within a predetermined range.

Subsequently, in the next step, the covering treatment tool 1 is positioned with respect to the power cable 100. That is, the operator arranges the second region E2 at a position determined with respect to the cable sheath 105, and holds the second region E2 by hand at that position. As a result, the holding force F1 acts on the second region E2, so that the movement of the coating treatment tool 1 in the axial direction D1 is restricted.

Subsequently, in the next step, the power cable 100 is covered by the first region E1 by disassembling the diameter-expanding holding member 3 while keeping the holding force F1 acting on the second region E2. That is, the operator pulls the core ribbon 22 toward the upstream side in the axial direction D1 to gradually disassemble the diameter-expanding holding member 3 so that the end portion 3b moves toward the upstream side in the axial direction D1. As a result, the power cable 100 is covered with the first region E1 in order from the downstream side to the upstream side in the axial direction D1. As described above, the covering of the power cable 100 by the elastic tubular member 2 is completed.

Next, the action / effect of the coating treatment tool 1 according to the present embodiment will be described.

First, as a covering treatment tool according to the first comparative example, an elastic tubular member 2 that is not held by the diameter-expanding holding member 3 is directly inserted into the power cable 100. In this case, of the elastic tubular member 2, the inner diameter R1 of the first region E1 covering the insulating portion 102 of the power cable 100 has a size smaller than the outer diameter of the insulating portion 102. Therefore, since the operator needs to firmly insert the power cable 100 into the elastic tubular member 2, a large insertion force is required. Therefore, the power cable 100 may not be well covered with the elastic tubular member 2 without using grease or the like. In this way, the termination process of the power cable may become difficult.

As a covering treatment tool according to the second comparative example, a tool for expanding the entire area of the elastic tubular member 2 in the axial direction D1 with the diameter-expanding holding member 3 will be described. In this case, by passing the power cable 100 through the inside of the diameter-expanding holding member 3 and disassembling the diameter-expanding holding member 3, the entire area of the elastic tubular member 2 contracts, thereby covering the end of the power cable 100. it can. However, in such a second comparative example, in the covering treatment tool, the elastic tubular member 2 and the power cable 100 are separated by the diameter-expanding holding member 3 with a gap over the entire area in the axial direction D1. , It is necessary to position the elastic tubular member 2 with respect to the power cable 100. Therefore, it is difficult to position the covering treatment tool with respect to the power cable 100. If the diameter-expanding holding member 3 is disassembled in that state, the position of the covering treatment tool 1 may shift. If the positioning is incorrect, the elastic tubular member 2 contracts and is in close contact with the power cable 100, so that the work cannot be redone. As described above, in the second comparative example, it may be difficult to accurately align the elastic tubular member 2 and the power cable 100. This can make it difficult to terminate the power cable.

On the other hand, the covering treatment tool 1 according to the present embodiment is a covering treatment tool 1 for terminating the power cable 100, and covers the pullable tubular hollow diameter-expanding holding member 3 and the power cable 100. An elastic tubular member 2 is provided, and a part of one end side of the elastic tubular member 2 in the axial direction D1 is held in a state of being expanded to the outer peripheral side of the diameter-expanded holding member 3, and is held in the axial direction of the elastic tubular member 2. The other portion on the other end side of D1 protrudes from the end portion 3b of the diameter-expanded holding member 3 in the axial direction D1.

In this case, a part of the elastic tubular member 2 on the one end side in the axial direction D1 is held in a state of being expanded to the outer peripheral side of the diameter expansion holding member 3. The other portion of the elastic tubular member 2 on the other end side in the axial direction D1 is in a contracted state because it protrudes from the end portion 3b of the diameter-expanding holding member 3 in the axial direction D1. Therefore, when attaching the covering treatment tool 1 to the power cable 100, first, the power cable 100 may be inserted into the contracted portion near the end 2b of the elastic tubular member 2. Since the inner diameter R2 of the second region E2, which is a contracted portion, is large, the insertion force of the first comparative example is not required to insert the power cable 100. Since the first region E1 of the elastic tubular member 2 having a small inner diameter R1 is expanded in diameter by the diameter-expanding holding member 3, the power cable 100 can be smoothly inserted without obstructing the insertion of the power cable 100. I can guide you. From the above, in the coating treatment tool 1 according to the present embodiment, the coating treatment tool 1 can be easily attached to the power cable 100 as compared with the first comparative example without using grease or increasing the amount of grease. Can be done. Further, when the diameter-expanded holding member 3 is disassembled, accurate positioning can be performed by holding the second region E2 already covered with the power cable 100. From the above, the termination process of the power cable 100 can be easily performed.

The elastic tubular member 2 has a first region E1 formed on one end side in the axial direction D1 and a second region E2 formed on the other end side, and in a state where the elastic tubular member 2 is contracted. The second region E2 has a larger diameter than the first region E1, and at least the first region E1 may be held in a state of being expanded by the diameter expansion holding member 3. As a result, when the coating treatment tool 1 is attached to the power cable 100, the power cable 100 may be inserted into the second region E2 having a large diameter, which is compared with the case where the power cable 100 is inserted into the first region E1 having a small diameter. Therefore, the required insertion force can be reduced. On the other hand, since the first region E1 having a small diameter and easily hindering the insertion of the power cable 100 is expanded by the diameter-expanding holding member 3, the effect of facilitating the passage of the power cable 100 is a portion having a large diameter. It becomes more remarkable than the case of expanding the diameter.

The end portion 3b of the enlarged diameter holding member 3 may extend to an intermediate position in the axial direction D1 in the second region E2. The vicinity of the end portion 3b of the enlarged diameter holding member 3 is a portion where the proof stress against the compressive force of the elastic tubular member 2 is weaker than that near the center in the axial direction D1. On the other hand, the second region E2 having a large diameter is a region in which the compressive force with respect to the enlarged diameter holding member 3 is smaller than that of the first region E1 having a small diameter. Therefore, by arranging the portion near the end portion 3b of the diameter-expanded holding member 3 in the second region E2, it is possible to suppress crushing or deformation of the portion.

The coating treatment tool 1 may further include an electric field relaxation layer 4 arranged on the inner peripheral side of the elastic tubular member 2. In this case, the coating treatment tool 1 can be suitably used for the termination treatment of the high-voltage (for example, 6600 V or more) power cable 100.

The present invention is not limited to the above-described embodiment.

The diameter of the region held by the diameter-expanded holding member during contraction may be the same as or smaller than the diameter of the region protruding from the diameter-expanded holding member during contraction. For example, the elastic tubular member may have a constant diameter over the entire axial direction D1. Further, the diameter-expanding holding member may hold a region having a larger diameter at the time of contraction than the protruding region.

The end portion 3b may be arranged at the boundary portion between the first region E1 and the third region E3, or at an intermediate position in the axial direction D1 of the first region E1.

1 ... Coating treatment tool, 2 ... Elastic tubular member, 3 ... Diameter expansion holding member, 4 ... Electric field relaxation layer, 100 ... Power cable, E1 ... First region, E2 ... Second region.

Claims (4)

A coating treatment tool for terminating power cables
With a retractable tubular hollow diameter expansion holding member,
An elastic tubular member that covers the power cable,
A part of the elastic tubular member on one end side in the axial direction is held in a state of being expanded to the outer peripheral side of the diameter expansion holding member.
A coating treatment tool in which the other portion of the elastic tubular member on the other end side in the axial direction protrudes in the axial direction from the end portion of the diameter-expanding holding member. The elastic tubular member has a first region formed on the one end side in the axial direction and a second region formed on the other end side.
When the elastic tubular member is contracted, the second region has a larger diameter than the first region.
The coating treatment tool according to claim 1, wherein at least the first region is held in a state of being expanded in the diameter-expanded holding member. The coating treatment tool according to claim 2, wherein the end portion of the diameter-expanded holding member extends to an intermediate position in the axial direction in the second region. The coating treatment tool according to any one of claims 1 to 3, further comprising an electric field relaxation layer arranged on the inner peripheral side of the elastic tubular member.

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