Special tool for adapting 500kV line to L-shaped yoke plate

Abstract

The invention discloses a special tool for adapting a 500kV line to an L-shaped yoke plate. The special tool comprises a length adjusting piece and at least one porous connecting card, the length of the length adjusting part is adjustable; the porous connecting clamp is connected to one end of the length adjusting piece in the length direction; one end of the porous connecting clamp is provided with a first connecting groove, and the other end is provided with a first connecting seat; the L-shaped connecting plate is inserted into the first connecting groove, and the L-shaped connecting plate and the porous connecting clamp are connected through the two first fasteners; the first connecting seat is used for connecting the end part of the length adjusting piece; the multi-hole connecting card is provided with a connecting hole group; the connecting hole group is matched with the two access holes of the L-shaped yoke plate; the connecting hole group comprises at least three connecting holes; the two first fasteners penetrate through two connecting holes and two access holes of the connecting hole group to be connected with the L-shaped connecting plate and the multi-hole connecting clamp; and the relative positions of the L-shaped connecting plate and the porous connecting clamp are changed by using different connecting holes. The position of the special tool relative to the L-shaped yoke plate can be adjusted, so that the operation convenience is improved.

Description

Technical Field

[0001] The invention relates to the technical field of power transmission line maintenance, in particular to a special tool for a 500kV line adapted to an L-shaped coupling plate. Background Art

[0002] With the continuous development of the current domestic power grid construction work, my country's ultra-high voltage and ultra-high voltage transmission and transformation projects have become world-class super projects in recent years. The requirements for reliability and uninterrupted power supply are getting higher and higher. At present, live working has also achieved great development results. Among them, the equipotential method or power outage replacement of insulator strings for 500kV lines and other lines uses this operation method. The live working personnel follow the safety requirements of the operation project, and the operation is convenient, fast, safe and reliable, with high operation efficiency, which plays an important role in ensuring social and economic influence.

[0003] L-type joint plate is used for parallel assembly of double insulator strings and multi-insulator strings, assembly of insulator strings with double or multiple conductors, and assembly of double guy wires. It can also be used for assembly of single insulator strings with two split conductors, and some models can be equipped with grading rings, which are suitable for lines with higher voltage levels, such as 500kV lines. Figure 1 , a first side connection hole 100, two side connection holes 101 and a pair of inspection holes 102 are arranged on it, the two side connection holes 101 are used to connect the insulator string, the L-type connecting plate has multiple models, among which the spacing between the pair of inspection holes 102 of L-1040, L-1240, L-1060 and L-2140 is the same or similar. It is an existing method to connect the insulator string replacement tool with the help of a pair of inspection holes 102, but since some models of L-type connecting plates have a small overall width and the pair of inspection holes 102 are located in the middle of the L-type connecting plate, the spacing between the insulator string replacement tool and the insulator string will be too small, and the operation is inconvenient. Summary of the invention

[0004] In order to overcome the deficiencies in the prior art, the present invention provides a special tool for a 500kV line adapted to an L-shaped coupling plate, which has the advantage of adjusting the position of the special tool relative to the L-shaped coupling plate to improve operational convenience.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A special tool for a 500kV line adapted to an L-shaped connecting plate, comprising a length adjusting member and at least one multi-hole connecting card; the length of the length adjusting member is adjustable; the multi-hole connecting card is connected to one end of the length adjusting member in the length direction; one end of the multi-hole connecting card has a first connecting groove and the other end has a first connecting seat; the first connecting groove is used for inserting the L-shaped connecting plate and two first fasteners are used to connect the L-shaped connecting plate and the multi-hole connecting card; the first connecting seat is used to connect the end of the length adjusting member; the multi-hole connecting card has a connecting hole group; the connecting hole group cooperates with two inspection holes of the L-shaped connecting plate; the connecting hole group comprises at least three connecting holes; two of the first fasteners pass through two of the connecting holes and two inspection holes of the connecting hole group to connect the L-shaped connecting plate and the multi-hole connecting card; the relative position of the L-shaped connecting plate and the multi-hole connecting card is changed by using different connecting holes.

[0007] By adopting the above technical solution, when the two first fasteners pass through the two inspection holes and the two connecting holes on the left, the special tool is biased to the right relative to the L-shaped connecting plate; when the two first fasteners pass through the two inspection holes and the two connecting holes on the right, the special tool is biased to the left relative to the L-shaped connecting plate. In this way, the distance between the insulator string replacement tool and the insulator string can be adjusted to increase the subsequent operation space and improve the operating convenience.

[0008] Optionally, the connecting hole group includes a first connecting hole group and a second connecting hole group; the first connecting hole group includes three first connecting holes; all the first connecting holes are on the same straight line and the spacing between adjacent first connecting holes is equal; the second connecting hole group includes a second connecting hole and a third connecting hole; the second connecting hole and the third connecting hole are on the same straight line and the spacing between the two is equal to the spacing between adjacent first connecting holes; the cross-section of one end of the second connecting hole and the third connecting hole that are close to each other is symmetrical relative to the center plane of the multi-hole connecting card.

[0009] By adopting the above technical solution, the special tool can be tilted to the left or right relative to the L-shaped connecting plate with the help of two of the first connecting holes. When using the second connecting hole and the third connecting hole, the special tool is centered relative to the L-shaped connecting plate, so that the adjustment range is larger.

[0010] Optionally, the third connecting hole is a waist-shaped hole.

[0011] By adopting the above technical solution, the L-shaped connecting plate with a certain distance between two inspection holes can be adapted by means of the second connecting hole and the waist-shaped third connecting hole, thereby improving adaptability.

[0012] Optionally, the connection hole group includes a fourth connection hole and a pair of fifth connection holes; the fourth connection hole and the pair of fifth connection holes are on the same straight line and the fourth connection hole is located between the pair of fifth connection holes; the fifth connection hole is a waist-shaped hole.

[0013] By adopting the above technical solution, when connecting with the fifth connecting hole and the fourth connecting hole on the left side, the special tool is at the rightmost side relative to the L-shaped connecting plate, and when connecting with the fifth connecting hole and the fourth connecting hole on the right side, the special tool is at the leftmost side relative to the L-shaped connecting plate. When connecting with a pair of fifth connecting holes, the special tool can have a certain left and right adjustment space relative to the L-shaped connecting plate, so that the adjustment range is larger.

[0014] Optionally, the multi-hole connecting card also includes a second connecting seat connected to the L-shaped connecting plate; the first connecting groove and the connecting hole group are arranged on the second connecting seat; the second connecting seat is slidably arranged on the first connecting seat along the length direction of the length adjustment member; a supporting member is arranged on the second connecting seat; the supporting member is used to adjust the relative position of the first connecting seat and the second connecting seat so that the first connecting seat abuts against the end of the L-shaped connecting plate connected in the first connecting groove.

[0015] By adopting the above technical solution, when the special tool is connected to the L-shaped connecting plate, the two first fasteners fix the L-shaped connecting plate and the first connecting seat of the porous connecting card, and the abutment member abuts against the end of the L-shaped connecting plate, thereby reducing the tendency of relative movement between the porous connecting card and the L-shaped connecting plate, thereby increasing the connection stability of the first fastener and the connection between the porous connecting card and the L-shaped connecting plate.

[0016] Optionally, a gap adjustment plate is slidably arranged in the first connecting groove; an intermediate through hole corresponding to the connecting hole group is formed on the gap adjustment plate; a plurality of extension portions are arranged on one of the side walls of the gap adjustment plate; the extension portions correspond one-to-one to the intermediate through holes; the extension portions pass through the opposite side walls of the first connecting groove and the extension length thereof is greater than the thickness of the side walls of the first connecting groove through which they pass.

[0017] By adopting the above technical solution, after the installation is completed, the two first fasteners make the gap adjustment plate abut against the L-shaped connecting plate through the extension part, thus compensating for the gap between the L-shaped connecting plate and the porous connecting card, thereby reducing the tendency of relative movement between the porous connecting card and the L-shaped connecting plate, thereby increasing the connection stability of the first fasteners and the connection between the porous connecting card and the L-shaped connecting plate.

[0018] Optionally, it comprises a length adjusting member and two porous connecting cards; the two porous connecting cards are respectively connected to two ends of the length adjusting member in the length direction.

[0019] By adopting the above technical solution, the two multi-hole connecting cards are respectively connected to the L-shaped connecting plates at both ends of the horizontal insulator string, and then the length adjusting member is shortened to bring the L-shaped connecting plates at both ends closer, thereby realizing the force transfer of the insulator string, thereby facilitating the replacement of the insulator string.

[0020] Optionally, it includes a length adjusting member, a multi-hole connecting card and a wire hook; the multi-hole connecting card and the wire hook are respectively fixed at two ends of the length direction of the length adjusting member.

[0021] By adopting the above technical solution, the multi-hole connection card is connected to the L-shaped connecting plate at the upper end of the vertically arranged insulator string, the wire hook hooks the wire at the lower end of the insulator string, and then the length adjustment member shortens the length to pull the wire, thereby realizing the force transfer of the insulator string, thereby facilitating the replacement of the insulator string.

[0022] Optionally, an insulating pull rod is also included; the insulating pull rod is connected to an end of the length adjusting member away from the porous connecting card.

[0023] By adopting the above technical solution, the insulating pull rod lengthens the overall length of the special tool, and a longer insulator string is used.

[0024] Optionally, the first connecting seat is connected to the end of the length adjusting member through a second fastener; the second fastener and the first fastener are parallel to or perpendicular to each other.

[0025] By adopting the above technical solution, the multi-hole connection card has two forms with different directions of the second fastener, and the appropriate direction of the second fastener can be selected as needed to reduce the possibility of interference in subsequent operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the front view of the L-shaped connecting plate of the present invention.

[0027] Figure 2 It is a structural diagram of embodiment 1 of the present invention.

[0028] Figure 3 It is a front view structural schematic diagram of the multi-hole connection card according to the first embodiment of the present invention.

[0029] Figure 4 It is a schematic structural diagram of the cross section of the multi-hole connection card according to the first embodiment of the present invention.

[0030] Figure 5 It is a schematic diagram of the structure of the multi-hole connection card of the second embodiment of the present invention from the rear view.

[0031] Figure 6 It is a structural schematic diagram of a partial cross section of a multi-hole connection card according to the second embodiment of the present invention.

[0032] Figure 7 The present invention Figure 6 Schematic diagram of the structure of the cross section of AA.

[0033] Figure 8 It is a schematic diagram of the cross-section structure of the multi-hole connection card of the third embodiment of the present invention.

[0034] Fig. 9 It is a structural diagram of embodiment 4 of the present invention.

[0035] Fig.10 It is a schematic structural diagram of other embodiments of the present invention.

[0036] Description of reference numerals:

[0037] 10. L-shaped connecting plate; 100. first side connecting hole; 101. side connecting hole; 102. inspection hole;

[0038] 20. Multi-hole connection card; 200. First connection slot; 201. Second connection slot; 202. First connection hole; 203. Second connection hole; 204. Third connection hole; 21. Second support plate; 22. Third support plate; 220. End connection hole; 23. First support plate; 24. Gap adjustment plate; 240. First middle through hole; 241. Extension; 242. Second middle through hole; 243. Third middle through hole; 244. Sliding guide groove; 25. Center connection seat; 250. Disassembly gap; 251. Sliding guide bar; 26. Second connection seat; 261. Baffle; 262. Connection block; 263. Fourth connection hole; 264. Fifth connection hole; 265. Sliding connection slot; 27. Abutment block; 28. Abutment drive bolt;

[0039] 30. Length adjustment member;

[0040] 40. Insulation pull rod. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1-Figure 10 The present invention is described in further detail.

[0042] Embodiment 1: A special tool for a 500 kV line adapted to an L-type coupling plate is disclosed, wherein the L-type coupling plate 10 is as follows: Figure 1 As shown, it is triangular in shape, and has a first side connection hole 100, two side connection holes 101 and a pair of inspection holes 102, and the two side connection holes 101 are respectively connected to the insulator strings.

[0043] refer to Figure 2The special tool includes a length adjusting member 30 and two porous connecting cards 20; the two porous connecting cards 20 are connected to the two ends of the length adjusting member 30 by bolts and nuts respectively; the length adjusting member 30 is a prior art, and the length adjusting member 30 can be set as a telescopic cylinder, a telescopic hydraulic cylinder, a lead screw or other telescopic structures, Figure 2 The middle is a lead screw, and the length adjusting member 30 can change its length. The length adjusting member 30 can include three tubes that are sequentially sleeved, with an outer thread processed on the outer surface of the middle tube and an inner thread processed on the inner surface, an inner thread processed on the outer surface of the outer tube, and an outer thread processed on the outer surface of the inner tube; the middle tube is threadedly connected with the outer tube and the inner tube respectively, so that when the middle tube is rotated, the outer tube and the inner tube move away or closer synchronously, thereby achieving length adjustment. In this way, the two multi-hole connection cards 20 are respectively connected to the L-shaped connecting plates 10 at both ends of the horizontal insulator string, and then the length adjusting member 30 shortens the length to pull the L-shaped connecting plates at both ends closer, so as to achieve force transfer of the insulator string, thereby facilitating the replacement of the insulator string.

[0044] refer to Figure 3 and Figure 4 The porous connection card 20 is a casting, which includes a first connection seat, a first support plate 23 and a second support plate 21; the first connection seat includes a central connection seat 25 and a pair of third support plates 22; the pair of third support plates 22 are formed at one end of the central connection seat 25 and the gap between the two is a second connection groove 201; the pair of third support plates 22 are respectively formed with end connection holes 220 vertically connected to the second connection groove 201; one end of the length adjustment member 30 is inserted into the second connection groove 201 and the second fastener passes through the end connection hole 220 and the length adjustment member 30 to connect the porous connection card 20 and the length adjustment member 30; wherein the second fastener is a bolt and nut; the first support plate 23 and the second support plate 21 are formed at one end of the central connection seat 25 away from the pair of third support plates 22 and the gap between the two is the first connection groove 200.

[0045] refer to Figure 3 and Figure 4The multi-hole connection card 20 has a connection hole group, which includes a first connection hole group and a second connection hole group; the first connection hole group includes three first connection holes 202; all the first connection holes 202 are on the same straight line and the spacing between adjacent first connection holes 202 is equal; the second connection hole group includes a second connection hole 203 and a third connection hole 204; the second connection hole 203 and the third connection hole 204 are on the same straight line and are located on the side of the first connection hole group away from the first connection seat; the spacing between the second connection hole 203 and the third connection hole 204 is equal to the spacing between adjacent first connection holes 202. The first connection hole 202, the second connection hole 203 and the third connection hole 204 all vertically penetrate the first support plate 23 and the second support plate 21 and are connected to the first connection groove 200. In order to adapt to the L-shaped connecting plate 10 with different but similar spacing between the two inspection holes 102, the third connection hole 204 is a waist-shaped hole.

[0046] When the L-shaped connecting plate 10 is connected to the multi-hole connecting card 20, a pair of first fasteners pass through a pair of first connecting holes 202 of the multi-hole connecting card 20 and two inspection holes 102 of the L-shaped connecting plate 10; or a pair of first fasteners pass through the second connecting hole 203 and the third connecting hole 204 of the multi-hole connecting card 20 and the two inspection holes 102 of the L-shaped connecting plate 10; wherein the first fasteners are bolts and nuts. Thus, when using the pair of first connecting holes 202 on the left side, the multi-hole connecting card 20 is biased to the right relative to the L-shaped connecting plate 10, so that if the insulator string connected to the side connecting hole 101 on the left side is replaced, the operation space can be increased; when using the pair of first connecting holes 202 on the right side, the multi-hole connecting card 20 is biased to the left relative to the L-shaped connecting plate 10, so that if the insulator string connected to the side connecting hole 101 on the right side is replaced, the operation space can be increased.

[0047] In this embodiment, the first fastener and the second fastener are perpendicular to each other. Fig.10 The rotation center axes of the end connection hole 220, the first connection hole 202, the second connection hole 203 and the third connection hole 204 are parallel to each other, so that the first fastener and the second fastener are parallel to each other. In this way, the multi-hole connection card 20 can be selected according to the operation space, which is conducive to avoiding operation interference.

[0048] Embodiment 2: The difference between Embodiment 2 and Embodiment 1 is: Figure 5-Figure 7, a gap adjustment plate 24 is slidably arranged in the first connecting groove 200; the gap adjustment plate 24 is formed with three first intermediate through holes 240, a second intermediate through hole 242 and a third intermediate through hole 243; the first intermediate through hole 240 corresponds to the first connecting hole 202 one by one; the second intermediate through hole 242 corresponds to the second connecting hole 203; the third intermediate through hole 243 corresponds to the third connecting hole 204; five extensions 241 are formed on the side wall of the gap adjustment plate 24 close to the first supporting plate 23; the extensions 241 correspond to the first intermediate through holes 240, the second intermediate through holes 242 and the third intermediate through holes 243 one by one, and the inner surfaces of the extensions 241 are aligned with the inner surfaces of the first connecting holes 202, the second connecting holes 203 and the third connecting holes 204 respectively; the first connecting holes 202, the second connecting holes 203 and the third connecting holes 204 of the first supporting plate 23 4 are respectively expanded outwards to allow the extension portion 241 of the corresponding side to pass through; the extension portion 241 passes through the first support plate 23 and its extension length is greater than the thickness of the first support plate 23; in this way, taking the connection by means of the two first connection holes 202 as an example, the L-shaped connecting plate 10 first enters between the gap adjustment plate 24 and the second support plate 21, and then the bolt of the first fastener passes through the first connection hole 202 of the second support plate 21, the first middle through hole 240 of the gap adjustment plate 24 and the extension portion 241 in sequence, and then the bolt of the first fastener is screwed on the nut, and the nut is rotated. As the nut is screwed in, it will abut against the extension portion 241 and move forward until the gap adjustment plate 24 and the second support plate 21 clamp the L-shaped connecting plate 10, thereby reducing the relative movement tendency of the L-shaped connecting plate 10 and the multi-hole connecting card 20, thereby increasing the connection stability of the first fastener and the connection between the multi-hole connecting card 20 and the L-shaped connecting plate.

[0049] refer to Figure 7 In order to prevent the gap adjustment plate 24 from being easily separated from the porous connection card 20, the two ends of the central connection seat 25 are respectively formed with sliding guide bars 251; the bottom surface of the gap adjustment plate 24 is formed with a moving groove for the central connection seat 25 to slide; and a pair of side walls of the moving groove are respectively formed with sliding guide grooves 244 that cooperate with the sliding guide bars 251. Figure 6 and Figure 7 In order to assemble and disassemble the gap adjustment plate 24 , a assembling and disassembling gap 250 is provided between the sliding guide bar 251 and the second support plate 21 , and the width of the assembling and disassembling gap 250 is the same as the width of the gap adjustment plate 24 .

[0050] Embodiment 3: The difference between Embodiment 3 and Embodiment 1 is: Figure 8The porous connection card 20 includes a first connection seat and a second connection seat 26; the second connection seat 26 includes a pair of baffles 261 and a pair of connection blocks 262; the pair of connection blocks 262 are connected between one end of the pair of baffles 261 close to the first connection seat; the spacing between the pair of baffles 261 is the first connection groove 200; the central connection seat 25 of the first connection seat is located between the pair of baffles 261; T-shaped sliding connection blocks are respectively formed on the two end surfaces of the central connection seat 25 close to the pair of baffles 261; a pair of T-shaped sliding connection grooves 265 for the sliding connection blocks to slide are respectively formed on the end surfaces of the pair of baffles 261 close to each other, so that the second connection seat 26 is slidably connected to the first connection seat.

[0051] refer to Figure 8 The connection hole group includes a fourth connection hole 263 and a pair of fifth connection holes 264, the fourth connection hole 263 and the pair of fifth connection holes 264 both vertically penetrate the pair of baffles 261 and are connected to the first connection groove 200; the fourth connection hole 263 and the pair of fifth connection holes 264 are on the same straight line and the fourth connection hole 263 is located between the pair of fifth connection holes 264; the fifth connection hole 264 is a waist-shaped hole.

[0052] In this way, when connecting with the help of the fifth connecting hole 264 and the fourth connecting hole 263 on the left, the special tool is at the rightmost side relative to the L-shaped connecting plate 10, and when connecting with the help of the fifth connecting hole 264 and the fourth connecting hole 263 on the right, the special tool is at the leftmost side relative to the L-shaped connecting plate 10. When connecting with the help of a pair of fifth connecting holes 264, the special tool can have a certain left and right adjustment space relative to the L-shaped connecting plate 10, so that the adjustment range is larger.

[0053] In order to improve the connection stability between the porous connection card 20 and the L-shaped connecting plate 10, a pair of connection blocks 262 are respectively connected with abutting members; the abutting member includes abutting driving bolt 28 and abutting block 27; the abutting driving bolt 28 vertically penetrates and is screwed on the abutting member; the abutting block 27 is a rectangular parallelepiped and its length is the same as the width of the first connecting groove 200, and the abutting block 27 is rotatably connected to the end of the abutting driving bolt 28, so that the abutting block 27 can be driven to move along the first connecting groove 200 by rotating the abutting driving bolt 28. After the porous connection card 20 and the L-shaped connecting plate 10 are connected by using the first fastener, the abutting driving bolt 28 is rotated so that the abutting block 27 abuts against the end of the L-shaped connecting plate 10, thereby reducing the relative movement tendency of the L-shaped connecting plate 10 and the porous connection card 20, thereby increasing the connection stability of the first fastener and the connection between the porous connection card 20 and the L-shaped connecting plate.

[0054] Embodiment 4: The difference between Embodiment 4 and Embodiment 1 is: Fig. 9In order to adapt to insulator strings of different lengths, the special tool also includes an insulating rod 40; the insulating rod 40 is connected between one of the porous connection cards 20 and the length adjustment member 30 through bolts and nuts. Alternatively, both ends of the length adjustment member 30 and the two porous connection cards 20 are connected with insulating rods 40.

[0055] Embodiment 5: Embodiment 5 is different from Embodiment 1 in that the special tool includes a length adjusting member 30, a multi-hole connection card 20 and a wire hook; the multi-hole connection card 20 and the wire hook are respectively fixed to the two ends of the length direction of the length adjusting member 30 by bolts and nuts. When used in this way, the multi-hole connection card 20 is connected to the L-shaped connecting plate 10 at the upper end of the vertically arranged insulator string, the wire hook hooks the wire at the lower end of the insulator string, and then the length adjusting member 30 is shortened to pull the wire, so as to realize the force transfer of the insulator string, thereby facilitating the replacement of the insulator string.

[0056] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A special tool for a 500 kV line adapted to an L-shaped connecting plate, comprising a length adjusting member (30) and at least one multi-hole connecting card (20); the length of the length adjusting member (30) is adjustable; the multi-hole connecting card (20) is connected to one end of the length adjusting member (30); one end of the multi-hole connecting card (20) has a first connecting groove (200) and the other end has a first connecting seat; the first connecting groove (200) is used for the L-shaped connecting plate to be inserted and two first fasteners are used to connect the L-shaped connecting plate and the multi-hole connecting card (20); the first connecting seat is used to connect the end of the length adjusting member (30); characterized in that: The multi-hole connection card (20) has a connection hole group; the connection hole group cooperates with the two inspection holes of the L-shaped connection plate; the connection hole group includes at least three connection holes; two of the first fasteners pass through two connection holes and two inspection holes of the connection hole group to connect the L-shaped connection plate and the multi-hole connection card (20); and the relative positions of the L-shaped connection plate and the multi-hole connection card (20) are changed by using different connection holes.

2. A special tool for 500kV line adapted to L-type coupling plate according to claim 1, characterized in that: The connection hole group comprises a first connection hole group and a second connection hole group; the first connection hole group comprises at least three first connection holes (202); all the first connection holes (202) are located on the same straight line and the spacing between adjacent first connection holes (202) is equal; the second connection hole group comprises a second connection hole (203) and a third connection hole (204); the second connection hole (203) and the third connection hole (204) are located on the same straight line and the spacing between the two is equal to the spacing between adjacent first connection holes (202).

3. A special tool for 500kV line adapted to L-type coupling plate according to claim 2, characterized in that: The third connecting hole (204) is a waist-shaped hole.

4. The special tool for 500kV line adapted to L-type coupling plate according to claim 1, characterized in that: The connection hole group comprises a fourth connection hole (263) and a pair of fifth connection holes (264); the fourth connection hole (263) and the pair of fifth connection holes (264) are located on the same straight line and the fourth connection hole (263) is located between the pair of fifth connection holes (264); the fifth connection hole (264) is a waist-shaped hole.

5. A special tool for 500kV line adapted to L-type coupling plate according to claim 4, characterized in that: The multi-hole connection card (20) also includes a second connection seat (26) connected to the L-shaped connection plate; the first connection groove (200) and the connection hole group are arranged on the second connection seat (26); the second connection seat (26) is slidably arranged on the first connection seat along the length direction of the length adjustment member (30); a supporting member is arranged on the second connection seat (26); the supporting member is used to adjust the relative position of the first connection seat and the second connection seat (26) so that the first connection seat is against the end of the L-shaped connection plate connected in the first connection groove (200).

6. The special tool for 500kV line adapted to L-type coupling plate according to claim 1, characterized in that: A gap adjustment plate (24) is slidably arranged in the first connecting groove (200); a middle through hole corresponding to the connecting hole group is formed on the gap adjustment plate (24); a plurality of extension parts (241) are arranged on one of the side walls of the gap adjustment plate (24); the extension parts (241) correspond one-to-one to the middle through holes; the extension parts (241) pass through the opposite side walls of the first connecting groove (200) and their extension length is greater than the thickness of the side wall of the first connecting groove (200) through which they pass.

7. The special tool for 500kV line adapted to L-type coupling plate according to claim 1, characterized in that: It comprises a length adjusting piece (30) and two multi-hole connecting cards (20); the two multi-hole connecting cards (20) are respectively connected to two ends of the length adjusting piece (30) in the length direction.

8. The special tool for 500kV line adapted to L-type coupling plate according to claim 1, characterized in that: It comprises a length adjusting piece (30), a multi-hole connecting card (20) and a wire hook; the multi-hole connecting card (20) and the wire hook are respectively fixed at two ends of the length direction of the length adjusting piece (30).

9. The special tool for 500kV line adapted to L-type coupling plate according to claim 1, characterized in that: It also comprises an insulating pull rod (40); the insulating pull rod (40) is connected to an end of the length adjusting member (30) away from the multi-hole connection card (20).

10. The special tool for 500kV line adapted to L-type coupling plate according to claim 1, characterized in that: The first connecting seat is connected to the end of the length adjusting member (30) via a second fastener; the second fastener and the first fastener are parallel or perpendicular to each other.

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