Self-locking grounding clamp with variable mouth distance for transformer substation

Abstract

The invention relates to a self-locking grounding clamp with a variable mouth distance for a transformer substation. Relates to the field of substation grounding pliers. In the prior art, a grounding wire clamp is directly hung on a main transformer binding post and is very easy to fall off in a maintenance process, so that the problem of loss of grounding protection is caused. The pliers comprise a pliers main body, a T-shaped fixing part, a crank, a convex handle and an adjusting bolt, the pliers main body is rotationally connected with the T-shaped fixing part through a shaft part, the T-shaped fixing part is rotationally connected with the head end of the crank through a first connecting shaft, and the crank is rotationally connected with the end, provided with a mounting shaft hole, of the convex handle through a second connecting shaft. The adjusting bolt is screwed into the internal thread at the bottom of the vice body, the top end of the adjusting bolt abuts against the bottom of the protruding handle, and when the vice body gets close to the crank, after a first connecting shaft at the position of the crank and the T-shaped fixing piece and a second connecting shaft at the position of the crank and the protruding handle pass through dead points, the jaw between the vice body and the T-shaped fixing piece enters a self-locking state. The invention is applied to the field of substation grounding clamps.

Description

Technical Field

[0001] The present invention relates to the field of grounding clamps for substations, and particularly to a self-locking grounding clamp with variable jaw distance for substations. Background Art

[0002] A substation is a power supply hub of the power system. Currently, the problem of hanging a ground wire on a transformer terminal post cannot be solved in the substation. The transformer terminal post is usually at a high potential, and there is a strong electric field around it. When a person approaches to hang the ground wire, it is very difficult to ensure an adequate safety distance, which is likely to cause an electric shock accident. Moreover, the spatial layout around the transformer is compact, and there may be other equipment, structures or cables, which will interfere with the extension of the operating tool and the operating posture of the personnel, making it difficult to smoothly hang the ground wire on the terminal post. At the same time, when overhauling the main transformer or the station transformer, grounding needs to be installed on both sides to ensure the safety of the overhaul. This is because there may be induced voltage or residual charge on both sides. If only one side is grounded, when there is an accidental power supply (such as induced electricity from adjacent equipment), the transformer may still be energized, posing a life threat to the overhaul personnel. At the same time, grounding on both sides forms an equipotential environment, which can timely conduct static electricity and other charges generated during the overhaul process into the ground. Especially when overhauling the main transformer or the station transformer, grounding needs to be installed on both sides of the transformer.

[0003] Currently, the two sides of the transformer are either a bergamot wire clamp or an upright terminal post. In the face of such a situation, there is currently no very reliable grounding method. The traditional grounding method is to directly hang the grounding wire clamp on the main transformer terminal post, but it is very easy to fall off during the overhaul process, resulting in the loss of grounding protection and bringing great potential safety hazards to the safety of the overhaul work. During the overhaul of the main transformer, the wiring on both sides is in an open state. At this time, there must be a tool that can meet the existing requirements: adapt to the wire clamp forms at both ends of the transformer, and quickly and reliably complete the grounding work, and is easy to operate. Summary of the Invention

[0004] In order to solve the problem that the existing grounding wire clamp is directly hung on the main transformer terminal post and is very easy to fall off during the overhaul process, resulting in the loss of grounding protection, the present invention provides a self-locking grounding clamp with variable jaw distance for substations.

[0005] The technical solution of the present invention is as follows:

[0006] A self-locking grounding clamp with variable jaw distance for substations, the self-locking grounding clamp with variable jaw distance for substations includes a clamp body main body, a T-shaped fixing member, a crank, a convex handle and an adjusting bolt, wherein the convex handle is used in cooperation with the T-shaped fixing member and the crank;

[0007] The main body of the pliers body is rotatably connected to the T-shaped fixing member through a shaft member. When the T-shaped fixing member rotates along the pliers body, the opening angle at the jaw between the pliers body and the T-shaped fixing member is changed. The T-shaped fixing member is rotatably connected to the head end of the crank through a first connecting shaft. The crank is rotatably connected to the end of the convex handle with a mounting shaft hole through a second connecting shaft. The end of the convex handle away from the mounting shaft hole is inserted into the groove body of the pliers body. An internal thread is provided at the bottom of the pliers body, and the adjusting bolt is screwed into the internal thread at the bottom of the pliers body, thereby pushing the adjusting bolt within the distance of the groove body of the pliers body. The top end of the adjusting bolt abuts against the bottom of the convex handle to support the bottom of the convex handle.

[0008] When the pliers body and the crank approach each other, after the first connecting shaft between the crank and the T-shaped fixing member and the second connecting shaft between the crank and the convex handle pass the dead point, the jaw between the pliers body and the T-shaped fixing member enters the self-locking state.

[0009] Further, the self-locking grounding pliers with variable jaw distance for a substation further includes a pull wire spring.

[0010] One end of the pull wire spring connected to the T-shaped fixing member is hung in the hanging hole on the T-shaped fixing member, and the other end of the pull wire spring is hung in the groove body of the pliers body. The pull wire spring pulls the T-shaped fixing member to reset.

[0011] Further, the self-locking grounding pliers with variable jaw distance for a substation further includes a release lever.

[0012] The release lever is rotatably connected to the middle and lower part of the pliers body through a shaft member. The release lever is used in cooperation with the convex handle. When the release lever is rotated, the end of the release lever will abut against the arc-shaped protrusion of the convex handle.

[0013] Further, the pliers body includes an anti-slip handle sleeve, a grounding bolt, and an upper jaw.

[0014] The pliers body is the main body structure of the self-locking grounding pliers with variable jaw distance for a substation. The outside of the pliers body is connected to the anti-slip handle sleeve. One side of the pliers body with the anti-slip handle sleeve is connected to the grounding bolt. The grounding bolt is fixedly connected to the grounding wire. The inclined surface at the upper part of the pliers body is fixedly connected to the upper jaw.

[0015] Further, the T-shaped fixing member includes a lower jaw.

[0016] The T-shaped fixing member is integrally in a Y-shaped structure, and the inclined surface at the top of the T-shaped fixing member is fixedly connected to the lower jaw.

[0017] Further, the upper jaw of the pliers body and the lower jaw of the T-shaped fixing member cooperate with each other, and the transformer bergamot wire clamp or the cylindrical connection point is clamped by the upper jaw and the lower jaw.

[0018] Further, shaft member insertion holes for installing the T-shaped fixing member, the convex handle and the release lever are respectively formed in the crank, and rotating shafts are respectively installed in the corresponding shaft member insertion holes, so that the T-shaped fixing member, the convex handle and the release lever rotate on the crank.

[0019] Further, the middle of the convex handle is an arc-shaped convex structure. After the arc-shaped convex structure in the middle of the convex handle is pressed by the release lever, the upper jaw and the lower jaw are opened.

[0020] Further, the adjusting bolt is screwed into the bottom of the pliers body through a threaded structure. The adjusting bolt adjusts the position of the bottom of the convex handle, so as to cooperate with the T-shaped fixing member and the crank to form a complete linkage, and change the opening distance between the upper jaw and the lower jaw.

[0021] The present invention has the following effects compared with the prior art:

[0022] The present invention is provided with an adjusting bolt, a convex handle and a crank structure. First, the adjusting bolt is adjusted, so as to cooperate with each other through the convex handle, the crank and the T-shaped fixing member to form a complete linkage. By screwing the adjusting bolt into and out of the bottom of the pliers body to adjust the position of the bottom of the convex handle, the adjusting bolt can be appropriately screwed out completely, so that the opening degree of the jaws is at the maximum opening distance, and see whether the fixing requirements of the clamped part are met at this time. If the fixing requirements of the clamped part are met, the adjustment of the jaw distance will not be continued. If not, the adjusting bolt on the pliers body will be continuously adjusted to further screw the adjusting bolt into the interior of the pliers body until the upper jaw and the lower jaw are tightened to a thickness suitable for the clamped part. This structure can be safe and reliable in application, quickly and effectively complete the grounding work, improve the safety level of various maintenance work in the substation, and improve the work efficiency.

[0023] The present invention adopts a grounding pliers with variable jaw distance, which can provide good grounding during the overhaul of the main transformer. It is easy to operate, adapts to various different wire clamps, and is also applicable to other positions where it is not convenient to hang the grounding wire. At the same time, it can quickly and effectively fix the terminal posts or special-shaped wire clamps on the high-voltage and low-voltage sides of the transformer, and can improve the safety level of the operation and maintenance work of the substation.

[0024] When the jaws of the present invention are loosened, the pliers handle is also in an open state, and at this time, the jaw distance can be adjusted. When the pliers handle is pinched, it changes from the state in Attachment Figure 1 to the state in Attachment Figure 2 to realize the self-clamping of the jaws.

[0025] When the present invention faces some relatively thin or slender objects to be clamped, it is necessary to screw in the adjusting bolt so that the jaws can be closed smaller. Attached Figure 3 That is, when facing small, slender, and thin components, it is the position of the adjusting bolt. After the pliers are squeezed tightly, since the connecting shaft between the crank and the convex handle has passed the dead center after the crank is pressed in, the jaws are self-locked at this time. It can improve the safety and convenience of maintenance work. Brief Description of the Drawings

[0026] Figure 1 is a schematic structural diagram of the present invention;

[0027] Figure 2 is a schematic structural diagram of the present invention when the crank is pressed against the main body of the pliers body;

[0028] Figure 3 is a schematic structural diagram of the present invention when the main body of the pliers body and the crank are opened;

[0029] Figure 4 is a schematic structural diagram of the present invention when the upper jaw of the main body of the pliers body and the lower jaw on the T-shaped fixing member are clamped;

[0030] Figure 5 is a schematic structural diagram of the main body of the pliers body of the present invention;

[0031] Figure 6 is a schematic structural diagram of the T-shaped fixing member of the present invention;

[0032] Figure 7 is a schematic structural diagram of the crank of the present invention;

[0033] Figure 8 is a schematic structural diagram of the convex handle of the present invention;

[0034] In the figure: 1. Main body of the pliers body, 2. T-shaped fixing member, 3. Crank, 4. Convex handle, 5. Adjusting bolt, 6. Tension spring, 7. Release lever, 8. Anti-slip handle sleeve, 9. Earthing bolt, 10. Upper jaw, 11. Earthing wire, 12. Lower jaw. Detailed Embodiments

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention. Detailed Embodiment 1:

[0037] Combined with Figure 1 — Figure 4Describing this embodiment, a self-locking grounding clamp with variable jaw distance for a substation in this embodiment, the self-locking grounding clamp with variable jaw distance for a substation includes a clamp body 1, a T-shaped fixing member 2, a crank 3, a convex handle 4, and an adjusting bolt 5. Among them, the convex handle 4 is used in cooperation with the T-shaped fixing member 2 and the crank 3;

[0038] The clamp body 1 is rotatably connected to the T-shaped fixing member 2 through a shaft member. When the T-shaped fixing member 2 rotates along the clamp body 1, the opening angle at the jaw between the clamp body 1 and the T-shaped fixing member 2 is changed. The T-shaped fixing member 2 is rotatably connected to the head end of the crank 3 through a first connecting shaft. The crank 3 is rotatably connected to one end of the convex handle 4 with a mounting shaft hole through a second connecting shaft. The end of the convex handle 4 away from the mounting shaft hole is inserted into the groove body of the clamp body 1;

[0039] The bottom of the clamp body 1 is provided with internal threads, and the adjusting bolt 5 is screwed into the internal threads at the bottom of the clamp body 1, thereby pushing the adjusting bolt 5 within the distance of the groove body of the clamp body 1. The top end of the adjusting bolt 5 abuts against the bottom of the convex handle 4 to support the bottom of the convex handle 4;

[0040] When the clamp body 1 and the crank 3 approach each other, after the first connecting shaft at the crank 3 and the T-shaped fixing member 2 and the second connecting shaft at the crank 3 and the convex handle 4 pass the dead center, the jaw between the clamp body 1 and the T-shaped fixing member 2 enters the self-locking state.

[0041] The function of the adjusting bolt 5 is to be able to adjust the bottom position of the convex handle 4 by screwing the bolt in and out, so as to cooperate with the crank 3 and the T-shaped fixing member 2 to form a complete linkage, and finally play a role in adjusting the size of the jaw distance. Specific Embodiment Two:

[0043] Combined with Figure 1 — Figure 4 Describing this embodiment, a self-locking grounding clamp with variable jaw distance for a substation in this embodiment, the self-locking grounding clamp with variable jaw distance for a substation further includes a wire-pulling spring 6;

[0044] One end of the wire-pulling spring 6 connected to the T-shaped fixing member 2 is hung in the hanging hole on the T-shaped fixing member 2. The other end of the wire-pulling spring 6 is hung in the groove body of the clamp body 1. The wire-pulling spring 6 pulls the T-shaped fixing member 2 to reset the T-shaped fixing member 2.

[0045] The function of the wire-pulling spring 6 is to pull the T-shaped fixing member 2 back, making it easy to return to its original position when not subject to other external forces. With the pulling force of the spring of the wire-pulling spring 6, the crank 3 can quickly open the jaws when the jaws are released through the wire-pulling spring 6. Specific Embodiment Three:

[0047] Combined Figure 1 — Figure 4 To illustrate this embodiment, a self-locking grounding clamp with variable jaw distance for a substation in this embodiment further includes a release lever 7;

[0048] The release lever 7 is rotatably connected to the middle and lower part of the clamp body 1 through a shaft member. The release lever 7 is used in cooperation with the convex handle 4. When the release lever 7 is rotated, the end of the release lever 7 will abut against the arc-shaped protrusion of the convex handle 4.

[0049] The function of the release lever 7: After the pliers handle is pinched, the jaws are also in a tightened state. Due to the action of the connecting rod, the jaws are in a self-locking state. At this time, a great deal of force is required to open the pliers. Using the lever principle of the release lever 7, the pliers handle can be easily opened, so that the jaws can be conveniently opened. Specific Embodiment Four:

[0051] Combined Figure 5 To illustrate this embodiment, a self-locking grounding clamp with variable jaw distance for a substation in this embodiment, the clamp body 1 includes an anti-slip handle sleeve 8, a grounding bolt 9 and an upper jaw 10;

[0052] The clamp body 1 is the main structure of the self-locking grounding clamp with variable jaw distance for a substation. The outside of the clamp body 1 is connected to the anti-slip handle sleeve 8. One side of the clamp body 1 with the anti-slip handle sleeve 8 is connected to the grounding bolt 9. The grounding bolt 9 is fixedly connected to the grounding wire 11. The inclined surface at the upper part of the clamp body 1 is fixedly connected to the upper jaw 10.

[0053] The clamp body 1 is the main part of the entire grounding clamp, cooperating with various components. There is a fixed upper jaw 10 at the top, and an internal thread cooperating with the adjusting bolt 5 at the bottom. The outside of the clamp body 1 is connected to the anti-slip handle sleeve 8.

[0054] There are two grounding bolts 9 on the clamp body 1, which are jointly used to fix the connection between the grounding wire 11 and the self-locking grounding clamp with variable jaw distance for a substation.

[0055] The grounding wire 11 cooperates with the grounding bolt 9 to fixedly connect the grounding wire 11 and the self-locking grounding clamp with variable jaw distance for a substation in a metallic manner.

[0056] The anti-slip handle sleeve 8 is integrally connected to the clamp body 1, especially used to prevent slipping when the clamp body 1 and the crank 3 are pinched. Specific Embodiment Five:

[0058] Combined Figure 6Describing this embodiment, a self-locking grounding clamp with variable jaw distance for a substation in this embodiment, the T-shaped fixing member 2 includes a lower jaw 12;

[0059] The T-shaped fixing member 2 is integrally in a Y-shaped structure, and the top inclined surface of the T-shaped fixing member 2 is fixedly connected to the lower jaw 12.

[0060] The upper jaw 10 cooperates with the lower jaw 12 to bite the transformer bergamot wire clamp or the cylindrical connection point.

[0061] The lower end of the nail fixing member 3 has a small hole for connecting the pulling wire spring 6, making it more convenient and labor-saving when returning to the original position. At the same time, it cooperates with the convex handle 4 and the crank 3 to complete the actions of tightening and releasing the jaws. Specific Embodiment Six:

[0063] Combined with Figure 5 and Figure 6 Describing this embodiment, a self-locking grounding clamp with variable jaw distance for a substation in this embodiment, the upper jaw 10 of the clamp body main body 1 and the lower jaw 12 of the T-shaped fixing member 2 cooperate with each other, and the transformer bergamot wire clamp or the cylindrical connection point is clamped by the upper jaw 10 and the lower jaw 12. Specific Embodiment Seven:

[0065] Combined with Figure 7 Describing this embodiment, a self-locking grounding clamp with variable jaw distance for a substation in this embodiment, shaft member insertion holes for installing the T-shaped fixing member 2, the convex handle 4 and the release lever 7 are respectively formed on the crank 3, and rotating shafts are respectively installed in each corresponding shaft member insertion hole, so that the T-shaped fixing member 2, the convex handle 4 and the release lever 7 rotate on the crank 3.

[0066] The function of the crank 3 is, firstly, when squeezing the pliers, another part except the clamp body main body 1 closely cooperates with the nail fixing member 2 and the convex handle 4 to complete the work of tightening the jaws. Specific Embodiment Eight:

[0068] Combined with Figure 8 Describing this embodiment, a self-locking grounding clamp with variable jaw distance for a substation in this embodiment, the middle of the convex handle 4 is in an arc-shaped convex structure, and after the middle arc-shaped convex structure of the convex handle 4 is pressed by the release lever 7, the upper jaw 10 and the lower jaw 12 are opened.

[0069] The function of the convex handle 4 cooperates with the crank 3 and the T-shaped fixing member 2. When the crank 3 moves backward (when the pliers are pinched), the convex handle 4 also approaches the pliers body 1. However, due to the support of the adjusting bolt 5 at its bottom, it can only rotate counterclockwise with the upper part of the adjusting bolt 5 as the center, resulting in the overall counterclockwise movement of the T-shaped fixing member 2, thereby tightening the jaws. Specific Embodiment Nine:

[0071] Combined with Figure 1 — Figure 8 To illustrate this embodiment, a self-locking grounding pliers with variable jaw distance for a substation in this embodiment. The adjusting bolt 5 is screwed into the bottom of the pliers body 1 through a threaded structure. The adjusting bolt 5 adjusts the position of the bottom of the convex handle 4, so as to cooperate with the T-shaped fixing member 2 and the crank 3 to form a complete linkage, changing the opening distance between the upper jaw 10 and the lower jaw 12.

[0072] Working principle:

[0073] First, adjust the adjusting bolt 5, so as to form a complete linkage through the cooperation between the convex handle 4, the crank 3 and the T-shaped fixing member 2. By screwing the adjusting bolt 5 into and out of the bottom of the pliers body 1 to adjust the position of the bottom of the convex handle 4, the adjusting bolt 5 can be completely screwed out appropriately, but enough threads should be reserved to cooperate with the internal threads at the lower part of the pliers body 1. At this time, the opening degrees of the upper jaw 10 on the pliers body 1 and the lower jaw 12 on the T-shaped fixing member 2 are at the maximum opening distance. Check whether the fixed requirements for clamping the clamped part are met at this time. If the fixed requirements for clamping the part are met, the adjustment of the jaw distance between the upper jaw 10 and the lower jaw 12 will not continue. If not, continue to adjust the adjusting bolt 5 on the pliers body 1, so that the adjusting bolt 5 is further screwed into the interior of the pliers body 1 until the upper jaw 10 and the lower jaw 12 are tightened to a thickness suitable for the clamped part.

[0074] The tightening of the jaws in the above operation is due to the fact that the crank 3 approaches one side of the pliers body 1, thereby tightening the jaws. Moreover, after the connecting shaft between the crank 3 and the T-shaped fixing member 2 and the connecting shaft between the crank 3 and the convex handle 4 pass the dead point, the self-locking grounding pliers with variable jaw distance for a substation enter the self-locking state. At this time, a relatively large force is required to open the jaws, which enables the present invention to be safe and reliable in application, quickly and effectively complete the grounding work, improve the safety level for various maintenance work in the substation, and enhance the work efficiency. If the shallow jaws of the self-locking grounding pliers with variable jaw distance for a substation are to be opened, the release lever 7 on the crank 3 can be rotated. The end of the release lever 7 presses against the arc surface of the convex handle 4. Using the lever principle of the release lever 7, the pliers handle can be easily opened, so that the jaws can be conveniently opened.

[0075] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, may make some changes or modifications using the above-disclosed technical content to obtain equivalent embodiments of equivalent changes. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent replacement, and improvement made to the above embodiments according to the technical essence of the present invention within the spirit and principle of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A self-locking grounding clamp with variable opening distance for use in a substation, characterized in that: The variable-distance self-locking grounding clamp for a substation comprises a clamp body (1), a T-shaped fixing piece (2), a crank (3), a lug (4) and an adjusting bolt (5), wherein the lug (4) is used in conjunction with the T-shaped fixing piece (2) and the crank (3); The pliers body (1) and the T-shaped fixing member (2) are rotatably connected via a shaft. When the T-shaped fixing member (2) rotates along the pliers body (1), the opening angle of the jaws between the pliers body (1) and the T-shaped fixing member (2) is changed. The T-shaped fixing member (2) and the head end of the crank (3) are rotatably connected via a first connecting shaft. The crank (3) and the end of the lug (4) with the mounting shaft hole are rotatably connected via a second connecting shaft. The end of the lug (4) away from the mounting shaft hole is inserted into the groove of the pliers body (1). The bottom of the pliers body (1) is provided with an internal thread. The adjusting bolt (5) is screwed into the internal thread at the bottom of the pliers body (1), thereby pushing the adjusting bolt (5) to a distance in the groove of the pliers body (1). The top end of the adjusting bolt (5) abuts against the bottom of the lug (4) to support the bottom of the lug (4). When the pliers body (1) and the crank (3) are brought close to each other, the first connecting shaft between the crank (3) and the T-shaped fixing piece (2) and the second connecting shaft between the crank (3) and the lug (4) pass the dead point, and the jaws between the pliers body (1) and the T-shaped fixing piece (2) enter a self-locking state.

2. The variable-distance self-locking grounding clamp for a substation according to claim 1, characterized in that: The variable-distance self-locking grounding clamp for a substation further comprises a wire pulling spring (6); One end of the wire-pulling spring (6) connected to the T-shaped fixing piece (2) is hung in a hanging hole on the T-shaped fixing piece (2), and the other end of the wire-pulling spring (6) is hung in a groove body of the pliers body (1). The wire-pulling spring (6) pulls the T-shaped fixing piece (2) to reset.

3. The variable-distance self-locking grounding clamp for a substation according to claim 1, characterized in that: The variable-distance self-locking grounding clamp for a substation further comprises a release pressure rod (7); The release lever (7) is rotatably connected to the middle and lower part of the pliers body (1) via a shaft. The release lever (7) is used in conjunction with the lug (4). When the release lever (7) is rotated, the end of the release lever (7) abuts against the arc-shaped protrusion of the lug (4).

4. The variable-distance self-locking grounding clamp for a substation according to claim 1, characterized in that: The clamp body (1) comprises an anti-slip handle sleeve (8), a grounding bolt (9) and an upper jaw (10); The clamp body (1) is the main structure of a self-locking grounding clamp with a variable opening distance for a substation. The outside of the clamp body (1) is connected to an anti-slip handle sleeve (8). The side of the clamp body (1) with the anti-slip handle sleeve (8) is connected to a grounding bolt (9). The grounding bolt (9) is fixedly connected to a grounding wire (11). The inclined surface on the upper part of the clamp body (1) is fixedly connected to an upper jaw (10).

5. The variable-distance self-locking grounding clamp for a substation according to claim 2, characterized in that: The T-shaped fixing member (2) comprises a lower jaw (12); The T-shaped fixing piece (2) is in a Y-shaped structure as a whole, and the top inclined surface of the T-shaped fixing piece (2) is fixedly connected to the lower jaw (12).

6. The variable-distance self-locking grounding clamp for a substation according to claim 4 or 5, characterized in that: The upper jaw (10) of the clamp body (1) and the lower jaw (12) of the T-shaped fixing member (2) cooperate with each other, and the transformer Buddha's hand wire clamp or columnar connection point is clamped by the upper jaw (10) and the lower jaw (12).

7. The variable-distance self-locking grounding clamp for a substation according to claim 6, characterized in that: The crank (3) is provided with shaft inserting holes for installing the T-shaped fixing piece (2), the protruding handle (4) and the release pressure rod (7), and the shaft inserting holes are respectively provided with corresponding rotating shafts, so that the T-shaped fixing piece (2), the protruding handle (4) and the release pressure rod (7) can rotate on the crank (3).

8. The variable-distance self-locking grounding clamp for a substation according to claim 7, characterized in that: The middle of the protruding handle (4) is an arc-shaped protruding structure. After the arc-shaped protruding structure in the middle of the protruding handle (4) is compressed by the release pressure rod (7), the upper jaw (10) and the lower jaw (12) are opened.

9. The variable-distance self-locking grounding clamp for a substation according to claim 1, characterized in that: The adjusting bolt (5) is screwed into the bottom of the pliers body (1) through a threaded structure, and the adjusting bolt (5) adjusts the bottom position of the lug (4), thereby cooperating with the T-shaped fixing piece (2) and the crank (3) to form a complete linkage, thereby changing the opening distance of the upper jaw (10) and the lower jaw (12).

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