JP4986160B2 - Nut rotation restricting jig and transformer dismantling device - Google Patents

Description

  The present invention is to remove a fastening member including a bolt member constituting a secondary bushing attached to a transformer housing for power distribution and a nut member screwed to the bolt member from the transformer housing. The present invention relates to a nut rotation restricting jig used in a transformer, and a transformer dismantling instrument provided with the jig.

  In general, a pole transformer installed in an overhead electric wire facility such as a utility pole is deteriorated in insulation performance over time, leading to a reduction in safety. For this reason, pole transformers are collected after use for an arbitrary period and disassembled into individual parts at a factory, and each part is recycled or disposed of.

  As shown in FIG. 6, the pole transformer includes an iron core 101, a coil 102, insulating oil (not shown) and the like inside a cylindrical transformer housing 100, and uses electromagnetic induction. It is the structure which transforms a voltage. Further, the transformer housing 100 is provided with a primary side bushing 103 and a secondary side bushing 104 connected to the lead wire of the electric wire on the outer surface.

  Although the structure of the pole transformer varies depending on the manufacturer's standard, the single-phase three-wire pole transformer used by the present applicant, as shown in FIG. The terminal structure includes the bolt member 110. The secondary side bushing 104 has a bolt member 110 inserted from the outside of the transformer housing 100. Then, inside the transformer housing 100, the coil connection terminal 112 is connected. Further, a plurality of nut members 113, 114, 115 are screwed into the bolt member 110 of the secondary bushing 104, and a coil connection terminal 112 is interposed between these nut members. As described above, the pole transformer is assembled so that the secondary bushing 104 and the coil connection terminal 112 do not easily fall off by firmly screwing the nut members 113, 114, and 115.

  When disassembling the pole transformer having the above structure, the secondary bushing 104 and the coil connection terminal 112 are removed. For this reason, in the dismantling operation, the plurality of nut members 113, 114, 115 inside the transformer housing 100 are fixed, and the secondary side bushing 104 is extracted from the outside of the transformer housing 100. Therefore, two workers are always required to dismantle the pole transformer, and the first worker fixes the nut members 113, 114, 115 inside the transformer housing 100 with a spanner or the like. A human operator has pulled out the secondary bushing 104 from the outside of the transformer housing 100 with an impact wrench (electric wrench) or the like.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to make it possible for one person to perform the work of disassembling the secondary side bushing of the transformer housing, and to facilitate the work.

  In order to solve the above problems, the present invention provides a fastening member including a bolt member constituting a secondary bushing attached to a transformer housing for power distribution, and a nut member screwed to the bolt member. A nut rotation restricting jig used when removing from a casing, comprising a jig main body mounted on the transformer casing and a spanner supported by the jig main body. In a state where the wrench is attached to the body, the wrench grips the nut member and prevents the nut member from rotating.

  According to such a configuration, even when the bolt member is rotated, the nut rotation restricting jig holds the nut member, so that it is prevented from rotating at the same time, and the bolt member can be reliably removed. Further, by gripping the nut member with the nut rotation restricting jig, the dismantling work can be performed by one worker, and the work can be performed efficiently.

Here, the jig body has a board disposed at the upper edge of the transformer housing, a guide plate that hangs down from the board and engages the secondary side bushing, and a spanner that hangs down inside the transformer housing. And a spanner support part for supporting
It is preferable that the guide plate is positioned so that the spanner supported by the spanner support portion is disposed at a position where the nut member can be gripped in a state where the guide plate is engaged with the secondary bushing.

  If comprised in this way, a spanner will be arrange | positioned in the position which can hold | grip a nut member only by engaging a guide plate with a secondary side bushing, and the positioning operation | work will become very easy.

Further, the spanner has a substantially U-shaped groove formed between a pair of first and second arm portions extending on both sides, and includes the following (A) to (C). Also good.
(B) The first cut surface formed by cutting the inner peripheral surface of the first arm portion outward as it goes to the inner side of the groove portion. (B) The inner peripheral surface of the second arm portion goes to the opening side of the groove portion. (C) Engagement formed by projecting in the direction of narrowing the opening of the groove from the tip of the second cutting surface and engaging the nut member inserted into the groove Corner

  Here, in the spanner, the opening of the groove portion is set to be larger than the width between the flat surfaces at the symmetrical positions of the nut member, and the interval between the first cut surface and the second cut surface is the opening width of the groove portion. It is set to be smaller than the width between the tops at the symmetrical positions of the nut member.

  According to such a configuration, the nut member can be disposed in the groove portion by passing between the flat surfaces at symmetrical positions of the nut member through the opening of the groove portion. Thereafter, when the bolt member that is screwed into the nut member is rotated, the top portions at the symmetrical positions of the nut member mesh with each other, and the rotation of the nut member is prevented. In addition, the nut member detached from the bolt member is caught by the engagement corner portion and does not fall off and remains in the groove portion of the spanner. Therefore, the nut member can be easily recovered after the dismantling operation.

  Further, the transformer disassembly instrument of the present invention is attached to the rotation shaft of the nut rotation restricting jig configured as described above and the electric wrench, and the base end of the secondary bushing exposed to the outside of the transformer casing A bolt rotating jig that engages with the portion and rotates the bolt member.

Here, the jig for rotating the bolt includes a wrench mounting portion attached to the tip of the electric wrench, and a bushing fitting that opens in a direction opposite to the wrench mounting portion and engages with the base end portion of the secondary side bushing. Part.
With this configuration, the bolt rotating jig can reliably transmit the rotational force of the electric wrench to the secondary bushing.

  As described above, according to the present invention, the secondary side bushing disassembly work of the transformer housing can be performed by one person, and the work can be facilitated.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 5 are views for explaining a transformer dismantling apparatus according to the present invention, and FIG. 1 is a perspective view showing an overall configuration of the transformer disassembling apparatus according to the present embodiment.
As shown in FIG. 1 and FIG. 1, the transformer disassembly instrument of the present embodiment includes a nut rotation restricting jig 10 and a bolt rotating jig 20. In addition, the transformer dismantling instrument of this embodiment is a jig applied to the dismantling of the secondary bushing 104 provided in the single-phase three-wire transformer housing 100 as described above.

  First, the mounting state of the transformer secondary bushing 104, the coil connection terminal 112, and the nut members 113, 114, and 115 will be described in more detail with reference to FIG. In the secondary bushing 104, the base end portion 111 is formed in a flat plate shape having a thickness in the axial direction so that it can be easily connected to the lead wire. Further, in the secondary side bushing 104, a screw groove 110a is formed in a bolt member 110 extending in a rod shape from the base end portion 111. The secondary bushing 104 is inserted from the bolt member 110 into the transformer housing 100 from the outside to the inside. Accordingly, the base end portion 111 is exposed to the outer surface of the transformer housing 100 in the inserted state. Further, the secondary bushing 104 is configured such that the outer insulating member 116 is interposed at the time of insertion and is not in direct contact with the transformer housing 100.

  On the other hand, the coil connection terminal 112 inside the transformer housing 100 is a metal plate having holes 112a and 112b at both ends. The coil connection terminal 112 has a hole 112a at one end contacting the bolt member 110 of the secondary bushing 104, and a hole 112b at the other end connected to a coil wire (not shown). When the secondary bushing 104 is inserted, the inner insulating member 117, the first nut member 113, the coil connection terminal 112, the second nut member 114, and the third nut member 115 are sequentially arranged with respect to the bolt member 110. The members are fitted or screwed together. Accordingly, the coil connection terminal 112 is connected to the secondary bushing 104 while being sandwiched between the first to third nut members 113, 114, and 115.

  When disassembling the transformer having such a structure, the secondary bushing 104 is rotated in a state in which the rotation of the nut members 113, 114, 115 screwed to the bolt member 110 of the secondary bushing 104 is restricted. Need to be removed. When the transformer is a single-phase three-wire type, three secondary bushings 104 connected to the lead wire are provided side by side, and it is efficient to remove the three secondary bushings 104 at the same time.

FIG. 2 is a view showing a nut rotation restricting jig of the transformer dismantling apparatus according to the present embodiment, where (a) is a plan view and (b) is a front view.
The nut rotation restricting jig of the transformer dismantling instrument according to the present embodiment has a function of restricting the rotation of the plurality of nut members 113, 114, 115 inside the transformer housing 100. As shown in FIG. 2, the nut rotation restricting jig includes a jig main body 10 and a spanner 30, and the jig main body 10 includes a substrate 11, a guide plate 12, and a spanner support portion 15. Among these, the board | substrate 11 is formed in the fan shape according to the upper end edge shape of the transformer housing | casing 100. FIG.

  The guide plate 12 is provided to hang from the lower surface of the substrate 11. The guide plate 12 is formed in an arc shape in conformity with the inner peripheral surface of the transformer housing 100, and three valley portions 13 corresponding to the single-phase three-wire type secondary bushing 104 are arranged at the lower end. ing. The jig body 10 can position the mounting position by engaging the valley 13 of the guide plate 12 with the three secondary bushings 104.

  The spanner support portion 15 is formed in a cylindrical shape, and has a configuration in which the handle 31 of the spanner 30 is inserted and supported in the hollow portion 14. The spanner support portions 15 are provided at two locations in the radial direction with respect to one trough portion 13 of the guide plate 12, that is, at six locations as a whole. A metal piece (not shown) that prevents the spanner 30 from coming off is attached to the handle 31 of the spanner 30.

  Here, the guide plate 12 is positioned between each spanner support 15 so that the spanner 30 supported by each spanner support 15 is arranged at a position where the nut members 113, 114, 115 can be gripped. Adjustments have been made.

Further, a confirmation hole 16 and a fixing long hole 17 are formed in the substrate 11. The confirmation hole 16 of the substrate 11 is provided between the guide plate 12 and the spanner support portion 15. The confirmation hole 16 is a hole through which an operator looks into operations such as positioning of the valley portion 13 of the guide plate 12 or gripping of the spanner 30 to the nut member. With this confirmation hole 16, the jig body 10 can be easily mounted.
The fixing long holes 17 are provided at both ends of the substrate 11, and fixing bolts 18 are inserted from above. As shown in FIG. 1, the fixing long hole 17 faces the stopper 105 that closes the lid of the transformer housing 100. The fixing bolt 18 is engaged with the groove of the stopper 105 through the fixing long hole 17 when the jig body 10 is mounted. As a result, the fixing long hole 17 can prevent the jig body 10 from being displaced in the circumferential direction in the disassembly work of the secondary side bushing 104.

FIG. 3 is an enlarged view showing the head portion of the spanner of the transformer dismantling device according to the present embodiment.
The spanner 30 is inserted and supported by the spanner support portion 15 of the jig body 10. As shown in FIG.
The spanner 30 is provided with a substantially U-shaped groove 33 in a head 32 following the handle 31. The head 32 of the spanner 30 is provided with a first arm part 34 on the right side of the groove part 33 and a second arm part 35 on the left side, and a throat sandwiched between the arm parts 34 and 35 at the flange part of the groove part 33. This is a configuration having a flange 36. In addition, the shaded part shown in FIG. 3 represents the notch part shaved off from the conventional spanner.

  In the spanner 30 shown in FIG. 3, the first opening curved surface 37 at the tip of the first arm portion 34 has a shape after cutting the right cut portion a, and the second opening curved surface 38 at the tip of the second arm portion 35. Is the shape after cutting off the left cut portion b. The first cut surface 39 following the first opening curved surface 37 has a shape after cutting the right cutting portion c, and the second cutting surface 40 following the second opening curved surface 38 is also the left cutting portion d. The shape after cutting. Furthermore, the relief groove 41 provided in the throat part 36 has a shape after cutting of the cutting part e. The first and second arcuate surfaces 42 and 43 on both sides of the escape groove 41 are used as they are, leaving a part of the conventional spanner shape.

The groove 33 of the spanner 30 forms a minimum width in the width interval D between the rear end of the first opening curved surface 37 and the rear end of the second opening curved surface 38. This width interval D is the same as the opening width of the groove portion of the conventional spanner. Therefore, when the spanner 30 is inserted into the nut member 113, the terminal ends of the first and second opening curved surfaces 37 and 38 regulate the insertion direction.
On the other hand, the first and second opening curved surfaces 37 and 38 are outwardly curved while being curved from the end to the tip. Here, the maximum opening width D <b> 3 at the tip of the groove 33 is set wider than the width D <b> 2 between the tops at the symmetrical positions of the nut member 113. Thereby, the spanner 30 with respect to the nut member 113 can be easily inserted.

  Further, a first cut surface 39 and a second cut surface 40 are formed in the heel direction from the first and second opening curved surfaces 37 and 38 of the groove 33. The first cut surface 39 is formed by cutting the inner peripheral surface of the first arm portion 34 outward as it goes to the back side of the groove portion 33. On the other hand, the second cut surface 40 is formed by cutting the inner peripheral surface of the second arm portion 35 outward as it goes to the opening side of the groove portion 33. The first cut surface 39 and the second cut surface 40 face each other substantially in parallel, and the distance between them is wider than that of a conventional spanner. Furthermore, an engagement corner portion 40a is formed at the tip of the second cut surface 40 by projecting in the direction of narrowing the opening of the groove portion 33.

  Here, the opening of the groove portion 33 is set to be larger than the width D1 between the flat surfaces at the symmetrical positions of the nut member 113, and the interval between the first cut surface 39 and the second cut surface 40 is set to be equal to that of the groove portion 33. It is set to be larger than the opening width and smaller than the width D2 between the top portions at the symmetrical positions of the nut member 113.

Further, when the spanner 30 is inserted into the nut member 113, the escape groove 41 is formed so that the top portion A of the nut member 113 enters deeper than the engagement corner portion 40a of the spanner 30 as shown in FIG. It is formed to ensure a sufficient depth. By forming the relief groove 41, when the spanner 30 is rotated, the flat surface portion between the top portions A and B of the nut member 113 can be bitten by the engagement corner portion 40a.
Note that the relief groove 41 does not have to be rectangular as shown in FIG. 3 as long as it has a depth shape capable of guiding the top A of the nut member 113 from the engagement corner portion 40a of the spanner 30. Alternatively, a U-shaped arc shape that continues from the first arc surface 42 to the second arc surface 43 may be used.

According to this configuration, the nut member 113 can be disposed in the groove 33 by passing between the flat surfaces at the symmetrical positions of the nut member 113 through the opening of the groove 33. Thereafter, when the bolt member 110 that is screwed into the nut member 113 is rotated, the top portions at the symmetrical positions of the nut member 113 mesh with each other of the first and second cut surfaces 39 and 40, and the rotation of the nut member 113 is performed. To prevent. Moreover, the nut member 113 detached from the bolt member 110 is caught by the engagement corner portion 40a and does not fall off and remains in the groove portion 33 of the spanner 30. Therefore, the nut member 113 can be easily recovered after the dismantling operation.
Further, when the bolt member 110 is released by rotating the bolt member 110 using an impact wrench as will be described later with the nut member 113 fixed by the spanner 30 having the above configuration, the spanner 30 has an impact. The big vibration of the wrench is transmitted. However, according to the spanner 30 having the above-described configuration, the nut member 113 is firmly bitten and held, so that the spanner 30 does not easily fall off from the nut member 113.

  The spanner 30 of the present embodiment has a thickness that varies depending on the first to third nut members 113, 114, and 115 that are screwed into the secondary bushing 104. Specifically, the first spanner 30a corresponds to the first nut member 113 shown in FIG. 7, and the second spanner 30b corresponds to the second and third nut members 114, 115. Therefore, the second spanner 30b is formed with a thickness sufficient to grip the second and third nut members 114 and 115 simultaneously. Therefore, the first to third nut members 113, 114, and 115 can be simultaneously gripped by the number of spanners 30 smaller than the number of nut members screwed.

FIG. 4 is a perspective view showing a state in which the nut rotation restricting jig of the transformer dismantling apparatus according to the present embodiment grips the terminal of the transformer.
As shown in FIG. 4, when attaching the jig body 10 of the nut rotation restricting jig to the transformer casing 100, first, the guide plate 12 is aligned with the inner peripheral surface of the transformer casing 100, and each The trough 13 is engaged with the secondary bushing 104 and mounted on the upper part of the transformer casing 100. Thereby, the positioning of the jig body 10 is ensured. Next, the spanner 30 is gripped by the nut members 113, 114, and 115 that are screwed into the secondary bushing 104. Since the spanner 30 is formed with the tip of the groove 33 wider as described above, the opening 33 properly guides the nut 33, 114, 115 even when the nut members 113, 114, 115 are slightly displaced. It is possible to securely grip. By holding the spanner 30 one after another in such a procedure, the nut members 113, 114, 115 on the bolt member 110 side of the three secondary side bushings 104 can be fixed.

FIG. 5 is a view showing a bolt rotating jig of the transformer dismantling tool according to the present embodiment, wherein (a) is a plan view, (b) is a front view, and (c) is a side view.
As shown in FIG. 5, the bolt rotating jig 20 of the transformer dismantling device includes a wrench mounting portion 21 that is fixed to an impact wrench (see FIG. 1) and a bushing fitting portion 22 that holds the secondary bushing 104. And have.

  The wrench mounting portion 21 of the bolt rotating jig 20 is formed in a cylindrical shape by a synthetic resin having elasticity, and an insertion hole (not shown) of an impact wrench is provided in the center portion along the axial direction. It is provided. The bolt rotating jig 20 is configured to be fixed to the impact wrench by inserting the tip of the impact wrench into the insertion hole and further inserting a fixing pin from above. Thereby, the bolt rotating jig 20 can transmit the rotational torque of the impact wrench to the bushing insertion portion 22.

  The bushing fitting portion 22 of the bolt rotating jig 20 is formed of a metal material, and an insertion port 23 is provided in a direction opposite to the insertion hole of the wrench mounting portion 21. This insertion port 23 is formed so as to engage with the shape of the base end portion 111 of the secondary side bushing 104. Accordingly, the bolt rotating jig 20 can hold the base end portion 111 of the secondary side bushing 104 by fitting it into the insertion port 23.

  Further, the bushing fitting portion 22 is provided with a pair of movable pins 24 that slide at right angles with respect to the insertion port 23. The movable pin 24 is inserted through a pair of cylindrical portions 25 protruding from the upper surface of the insertion port 23, and can be elastically slid by an urging spring 26. Here, as shown in FIG. 7, the base end portion 111 of the secondary side bushing 104 is provided with a lead wire hole 111a for connection to the lead wire. When the bushing insertion portion 22 is inserted into the base end portion 111, the movable pin 24 is configured to slide elastically and pass through the lead wire hole 111 a to lock the secondary side bushing 104. . The locking by the movable pin 24 can prevent the bolt rotating jig 20 from coming off from the base end portion 111 when the secondary bushing 104 is rotated.

  As shown in FIG. 1, in the disassembly work of the secondary bushing 104, after the first to third nut members 113, 114, 115 inside the transformer housing 100 are fixed by the jig body 10, the impact is performed. The bolt rotation jig 20 attached to the wrench is inserted into the proximal end portion 111 of the secondary side bushing 104. During this insertion, the movable pin 24 locks the lead wire hole 111 a, and the bushing fitting portion 22 holds the proximal end portion 111 of the secondary side bushing 104. Thereafter, by rotating the impact wrench, the bolt rotating jig 20 is rotated, and the secondary bushing 104 can be pulled out from the first to third nut members 113, 114, 115 in accordance with the rotation. .

After the secondary bushing 104 is pulled out, the knob 27 at the top of the movable pin 24 can be lifted to release the locking of the lead wire hole 111a by the movable pin 24. It is possible to move to dismantling.
In this way, the operator can easily dismantle the secondary bushing 104 of the transformer alone by using the transformer dismantling instrument including the nut rotation restricting jig and the bolt rotating jig 20. It becomes possible.

It is a perspective view which shows the whole structure of the transformer demolition tool which concerns on this embodiment. It is a figure which shows the nut rotation control jig | tool of the transformer demolition tool which concerns on this embodiment, (a) is a top view, (b) is a front view. It is a figure which expands and shows the head part of the spanner of the transformer dismantling instrument which concerns on this embodiment. It is a perspective view which shows the state which the nut rotation control jig | tool of the transformer dismantling instrument concerning this embodiment hold | gripped the terminal of the transformer. It is a figure which shows the jig | tool for bolt rotation of the transformer dismantling instrument which concerns on this embodiment, (a) is a top view, (b) is a front view, (c) is a side view. It is a perspective view which shows the structure of the transformer which this applicant uses. It is a side view which shows the secondary side bushing of the transformer which this applicant uses.

Explanation of symbols

10: Jig body, 11: Substrate, 12: Guide plate, 13: Valley part, 14: Hollow part, 15: Spanner support part, 16: Confirmation hole, 17: Long hole for fixing,
20: Bolt rotation jig, 21: Wrench mounting part, 22: Bushing insertion part, 24: Movable pin, 25: Tube part, 26: Biasing spring, 27: Knob,
30: Spanner, 31: Handle, 32: Head, 33: Groove, 34: First arm, 35: Second arm, 36: Throat, 37: First open curved surface, 38: Second Open curved surface, 39: first cut surface, 40: second cut surface, 41: relief groove,
DESCRIPTION OF SYMBOLS 100: Transformer housing | casing, 101: Iron core, 102: Coil, 103: Primary side bushing, 104: Secondary side bushing, 110: Bolt member, 111: Base end part, 112: Coil connection terminal, 113, 114, 115 : Nut member

Claims (5)

A nut used when removing a fastening member including a bolt member constituting a secondary bushing attached to a transformer housing for power distribution and a nut member screwed into the bolt member from the transformer housing A rotation regulating jig,
A jig main body mounted on the transformer housing, and a spanner supported by the jig main body, the spanner mounting the nut member in a state where the jig main body is mounted on the transformer housing. gripped by Ri configured der to prevent rotation of the nut member,
The jig body includes a substrate disposed at an upper end edge of the transformer housing, a guide plate that is suspended from the substrate and engages with the secondary bushing, and the spanner is disposed inside the transformer housing. And a spanner support part that supports in a suspended state
The nut, wherein the guide plate is positioned so that the spanner supported by the spanner support portion is disposed at a position where the nut member can be gripped in a state where the guide plate is engaged with the secondary bushing. Rotation restriction jig. The spanner has a substantially U-shaped groove portion between a pair of first and second arm portions extending on both sides, and has the following configurations (a) to (c). The nut rotation restricting jig according to claim 1 .
(A) A first cut surface formed by cutting the inner peripheral surface of the first arm portion outward as it goes to the inner side of the groove portion. (B) The inner peripheral surface of the second arm portion is The second cut surface formed by cutting outward as it goes to the opening side. (C) The second cut surface is formed so as to protrude from the tip of the second cut surface in the direction of narrowing the opening of the groove, and is inserted into the groove. Engagement corner for biting the nut member In the spanner, an opening of the groove portion is set to be larger than a width between flat surfaces at symmetrical positions of the nut member, and an interval between the first cut surface and the second cut surface is set to the groove portion. The nut rotation restricting jig according to claim 2 , wherein the nut rotation restricting jig is set to be larger than an opening width of the nut member and smaller than a width between top portions at symmetrical positions of the nut member. A nut rotation restricting jig according to any one of claims 1 to 3 ,
A bolt rotating jig that is mounted on a rotating shaft of an electric wrench and engages with a base end portion of the secondary bushing exposed to the outside of the transformer casing to rotate the bolt member. Transformer dismantling equipment. The bolt rotating jig includes a wrench mounting portion that is attached to the tip of the electric wrench, and a bushing insertion portion that opens in a direction opposite to the wrench mounting portion and engages with a base end portion of the secondary side bushing. The transformer dismantling apparatus of Claim 4 characterized by the above-mentioned.

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