CN111735994B - Clamp for transformer detection - Google Patents

Abstract

The invention discloses a fixture for detecting a transformer, which comprises a mounting bracket capable of vertically sliding and adjusting the height, wherein a plurality of mounting seats capable of sliding on the mounting bracket are arranged on the mounting bracket, a driving shaft coaxially arranged with the mounting seats is arranged on the mounting seats, a plurality of positioning clamping plates and a plurality of follow-up clamping plates which are connected on the mounting seats in a sliding manner are connected on the driving shaft, the plurality of positioning clamping plates and the plurality of follow-up clamping plates are all arranged in an annular array manner around the central axis of the driving shaft, when the fixture is used, the positioning clamping plates are driven by the driving shaft to be clamped on a transformer bushing, the positioning of the follow-up clamping plates can be realized, the follow-up clamping plates can be fixed on a transformer terminal and can be gradually clamped and fixed, and the follow-up clamping plates can be isolated and protected by the positioning clamping plates while the electrical stability of the follow-up clamping plates is ensured, the connection portability can be improved, and the safety of the connection can be improved.

Description

A fixture for transformer testing

technical field

The invention relates to the technical field of transformer testing, in particular to a transformer testing fixture.

Background technique

Transformer is an electrical equipment used for AC power conversion. It can convert the energy of one AC voltage and AC current into another AC voltage and AC current of the same frequency. The main function of the transformer in the power system It is to convert the voltage to facilitate the transmission of electric energy. After the voltage is boosted by the step-up transformer, it can reduce the line loss, improve the power transmission economy, and achieve the purpose of long-distance power transmission. The required voltage of the level electrical equipment to meet the needs of users.

After the transformer is produced, the transformer needs to be tested to ensure the safety in use. When the actual live test of the transformer is carried out, it is often connected by traditional wire clips, but during the test, there are It is easy to fall off and cause safety accidents, but connecting the transformer in the way of connecting the transformer to the line normally can avoid the problem that the test wiring is easy to fall off, but the fixing process is cumbersome, and it will cost a lot of money in the testing process. time, it is not possible to quickly test the transformer.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a transformer detection fixture, so as to solve the problem that the wire clip is easy to fall off and cause a safety accident when the wire clip is used to connect the transformer for testing in the prior art, and the method of connecting the transformer to the circuit normally is adopted. Fixing is a technical problem that the fixing process is cumbersome and time-consuming.

In order to solve the above-mentioned technical problems, the present invention specifically provides the following technical solutions:

A fixture for transformer detection includes a mounting bracket that can be vertically slid and adjusted in height, a plurality of mounting seats that can be slid on the mounting bracket are arranged on the mounting bracket, and The drive shaft is coaxially arranged on the seat, and the drive shaft is connected with a plurality of positioning clamping plates slidably connected to the mounting seat and a plurality of follow-up holding plates, a plurality of the positioning holding plates and a plurality of follow-up holding plates. The movable clamping plates are arranged in an annular array about the central axis of the drive shaft, the driven clamping plates are electrically connected with the external test power supply through cables, and the movement of the drive shaft makes the positioning clamping plates clamped on the transformer bushing, The follow-up clamping plate is positioned and further moved by the drive shaft, so that the follow-up holding plate is clamped on the transformer terminal and electrically connected with the external test power supply.

As a preferred solution of the present invention, the positioning clamping plate and the follow-up clamping plate are arranged alternately.

As a preferred solution of the present invention, one end of the plurality of positioning clamping plates facing the driving shaft is rotatably connected with a first connecting rod, and the other end of the first connecting rod is rotatably connected with the driving shaft. The first control ring is connected, and the drive shaft drives the first control ring, so that a plurality of positioning clamping plates are synchronously clamped on the transformer bushing, and the mounting seat is moved by the clamping force. Position the holding plate relative to the transformer terminals.

As a preferred solution of the present invention, the drive shaft is connected to the drive shaft through a first screwing buckle, and a plurality of track grooves are arranged in a circular array on the side wall of the drive shaft with respect to the central axis of the drive shaft. The mounting seat is fixed with a guide ring that is sleeved on the drive shaft and is used to cooperate with the track groove to make the drive shaft rotate. A fixed ring that rotates with grooves, the fixed ring is connected to the first control ring through the second screwing buckle, and the drive shaft rotates through the guide ring when moving, so that the driving shaft passes through the first screwing clip. When the buckle is disengaged from the first control ring, the fixing ring is connected with the first control ring through the second screwing buckle.

As a preferred solution of the present invention, the first and second screw-connecting buckles both include screw-connecting and embedding grooves that are opened on the first control ring and have an L-shaped structure. Both the first control ring and the first control ring are provided with a screw-connecting clamping block matched with the screw-connecting embedding groove.

As a preferred solution of the present invention, the fixing ring includes an outer ring that is slidably connected to the mounting seat through a spring, and an inner ring that is rotatably connected to the inner side of the outer ring, and the inner ring is fixed to the outer ring by matching with the track groove. The inner ring is connected to the first control ring through the fitting of the screw-connecting block and the screw-connecting embedding groove.

As a preferred solution of the present invention, the drive shaft includes an outer shaft and an inner shaft slidably connected to the outer shaft, the first control ring is connected to the outer shaft, and the outer shaft drives the positioning clamping plate to clamp After being installed on the transformer bushing, the inner shaft is driven to move.

As a preferred solution of the present invention, one end of the plurality of follower clamping plates facing the drive shaft is rotatably connected with a second connecting rod, and the other end of the first connecting rod is rotatably connected with the inner shaft The second control ring is fixedly connected, and the inner shaft drives the second control ring to synchronously clamp the plurality of follower clamping plates on the transformer terminals.

As a preferred solution of the present invention, the mounting seat is provided with a self-locking buckle for driving the drive shaft to move in a vertical direction, and the self-locking buckle includes a push rod rotatably connected to the mounting seat through a rotating shaft , and a connecting column rotatably connected to one end of the outer shaft away from the positioning splint, the connecting column is rotatably connected to the push rod through a connecting rod, the push rod rotates around the rotating shaft, and drives the connecting column to move the drive shaft in the vertical direction.

As a preferred solution of the present invention, an expansion ring in an annular structure is fixed at the bottom edge of the mounting base, a sliding groove matching the expansion ring is opened on the mounting bracket, and the mounting base is connected to the sliding ring through the expansion ring. The slot is fitted and slid on the mounting bracket, and a plurality of rolling steel balls are arranged at the bottom of the expansion ring for reducing the friction force between the expansion ring and the chute.

Compared with the prior art, the present invention has the following beneficial effects:

When the present invention is in use, when the positioning clamping plate is driven by the drive shaft to be clamped on the transformer bushing, the positioning of the following clamping plate can be realized, and the further movement of the driving shaft can fix the following clamping plate On the transformer terminal, it is gradually clamped and fixed, which can ensure the stability of its electrical connection, and can also isolate and protect the follow-up clamping plate by positioning the clamping plate, which can improve the portability of its connection and at the same time. its security when connected.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that are required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, other implementation drawings can also be obtained according to the extension of the drawings provided without creative efforts.

1 is a schematic diagram of the overall structure of an embodiment of the present invention;

2 is a schematic diagram of the connection structure of the follower clamping plate and the mounting seat in the embodiment of the present invention;

3 is a perspective view of an outer shaft in an embodiment of the present invention;

4 is a perspective view of a first control loop in an embodiment of the present invention;

5 is a schematic diagram of the connection structure of the inner shaft and the outer shaft in the embodiment of the present invention;

FIG. 6 is an enlarged view of a part of the structure at A in FIG. 1 .

The symbols in the figure are as follows:

1-Mounting bracket; 2-Mounting seat; 3-Drive shaft; 4-Positioning clamping plate; 5-Following clamping plate; 6-First screwing buckle; 7-Second screwing buckle; Self-locking hasp; 9-expansion ring; 10-chute; 11-rolling steel ball; 12-transformer bushing; 13-transformer terminal;

301-track groove; 302-guide ring; 303-fixed ring; 304-outer ring; 305-inner ring; 306-outer shaft; 307-inner shaft;

401 - the first connecting rod; 402 - the first control ring;

501 - the second connecting rod; 502 - the second control ring;

601-screwed slot; 602-screwed block;

801 - push rod; 802 - connecting column.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in FIG. 1 to FIG. 6 , the present invention provides a fixture for transformer detection, which includes a mounting bracket 1 that can be vertically slid and adjusted in height. The mounting seat 2, the bottom edge of the mounting seat 2 is fixed with an expansion ring 9 of a ring structure, and a sliding groove 10 matching the expansion ring 9 is opened on the mounting bracket 1, and the mounting base is inserted through the expansion ring 9 and the sliding groove 10. It slides on the mounting bracket 1 , and a plurality of rolling steel balls 11 are arranged at the bottom of the expansion ring 9 for reducing the friction force between the expansion ring 9 and the chute 10 .

The mounting bracket 1 is erected above the transformer to be tested. When in use, adjust the height of the mounting bracket 1 so that the mounting seat 2 is at a position horizontal to the transformer terminals. After adjusting the position of the mounting seat 2, It is convenient for the user to connect the test power supply and the transformer later.

It should be noted that the chute 10 is preferably a bar-shaped structure, and a limit stop that is slidably connected in the chute 10 is provided between each two mounting bases 2. When in use, it needs to be adjusted first according to the position of the transformer wiring. The position of the limit stop limits the movable range of the mounting seat 2, so that when the test power supply is connected to the transformer, the mounting seat 2 can be fitted with the expansion ring 9 and the chute 10 to a certain extent. For self-adaptive adjustment, the rolling steel balls 11 are used to reduce the friction between the expansion ring 9 and the chute 10 when adjusting the position of the mounting seat 2, which can effectively improve the smoothness of the position adjustment.

The mounting base 2 is provided with a drive shaft 3 coaxially arranged with the mounting base 2 , and a plurality of positioning clamping plates 4 and a plurality of follow-up clamping plates 5 are connected to the driving shaft 3 , which are slidably connected to the mounting base 2 . , a plurality of positioning clamping plates 4 and a plurality of follow-up holding plates 5 are arranged in a circular array about the central axis of the drive shaft 3, the follow-up holding plates 5 are electrically connected to the external test power supply through cables, and the movement of the drive shaft 3 makes the The positioning clamping plate 4 is clamped on the transformer bushing 12 to position the follow-up clamping plate 5, and further movement of the drive shaft 3 makes the follow-up clamping plate 5 clamped on the transformer terminal 13, and communicates with the outside world. Test the power supply for electrical connection.

The positioning clamping plates 4 and the following clamping plates 5 are arranged alternately. Here, the number of positioning clamping plates 4 is preferably four, and the number of the following clamping plates 5 is preferably two. 3 When moving, there will be a problem of interference between the positioning clamping plate 4 and the follower clamping plate 5.

The positioning clamping plate 4 is an arc-shaped structure that fits the transformer bushing 12. When the four positioning clamping plates 4 are clamped on the transformer bushing 12, they can be covered on the transformer bushing 12, so as to realize the preliminary alignment. When the transformer bushing 12 is fixed, the follow-up clamp plate 5 is placed inside it, so that the isolation protection of the follow-up clamp plate 5 can be realized by positioning the clamp plate 4 to ensure that the follow-up clamp plate 5 is passed through. 5 When connecting the transformer terminal 13, ensure the safety of its power connection.

When the positioning clamping plate 4 is clamped on the transformer bushing 12, since the transformer is fixed, the self-adaptive adjustment of the mounting base 2 can be realized during the fixing, so that the transformer terminal 13 can be in a plurality of follow-up clamping The center position of the plate 5 prevents its position from being deviated, resulting in unstable fixation of the positioning clamping plate 4 when fixing the transformer bushing 12 or the follower clamping plate 5 when fixing the transformer terminal 13 .

One end of the plurality of positioning clamping plates 4 facing the driving shaft 3 is rotatably connected with a first connecting rod 401, and the other end of the first connecting rod 401 is rotatably connected with a first control ring 402 connected with the driving shaft 3, The drive shaft 3 drives the first control ring 402 to synchronously clamp the plurality of positioning clamping plates 4 on the transformer bushing 12, and moves the mounting seat 2 by the clamping force, and the follower clamping plate 5 and the transformer terminals are moved. 13 to locate the relative position.

It should be noted that the mounting base 2 is provided with springs for restricting the positions of the plurality of positioning clamping plates 4 and the plurality of following clamping plates 5, so that they can be automatically adjusted by the force of the springs when they are not fixed. Loosen the securing of the transformer terminals 13 or the transformer bushing 12 .

Because the plurality of positioning clamping plates 4 are connected to the first control ring 402 through the first connecting rod 401, and the positioning clamping plates 4 can only move toward or away from the position of the centerline axis of the mounting seat 2, so when pulling When the driving shaft 3 drives the positioning clamping plate 4 to move, the first control ring 402 will not be rotated, which can ensure the stability of the connection between the first control ring 402 and the driving shaft 3 .

As shown in FIG. 1 and FIG. 3 , the drive shaft 3 is connected to the drive shaft 3 through the first screwing buckle 6 , and a plurality of track grooves 301 are arranged in a circular array on the side wall of the drive shaft 3 about the central axis of the drive shaft 3 . The mounting seat 2 is fixed with a guide ring 302 sleeved on the drive shaft 3 and used to cooperate with the track groove 301 to make the drive shaft 3 rotate. The mounting seat 2 is also connected to the drive shaft 3 through a spring sliding connection The fixed ring 303 rotates in cooperation with the track groove 301. The fixed ring 303 is connected with the first control ring 402 through the second screw buckle 7, and the drive shaft 3 rotates through the guide ring 302 when moving, so that the driving When the shaft 3 is disengaged from the first control ring 402 through the first screwing buckle 6 , the fixing ring 303 is connected to the first control ring 402 through the second screwing buckle 7 .

The track groove 301 where the guide ring 302 is connected with the drive shaft 3 and the track groove 301 where the fixed ring 303 is connected with the drive shaft 3 are not the same, so as to ensure that they will not interfere with each other during movement.

When the drive shaft 3 moves, it will control whether the drive shaft 3 rotates through the guide ring 302, that is, when the drive shaft 3 drives the first control ring 402 to move, so that the positioning clamping plate 4 is clamped on the transformer bushing 12, the first A control ring 402 is close to the fixing ring 303, and the drive shaft 3 continues to move, the drive shaft 3 will be rotated through the guide ring 302, and the first control ring 402 cannot be rotated, so it can be realized by the first rotary buckle 6 The separation between the first control ring 402 and the drive shaft 3, and at the same time, the rotation of the drive shaft 3 will cause the fixed ring 303 to rotate, and further, the fixed ring 303 and the first The connection between the control rings 402 completes the first stage of fixing the transformer bushing 12 .

As shown in FIG. 1 , FIG. 5 and FIG. 6 , both the first screw-on clip 6 and the second screw-on clip 7 include screw-on insertion grooves 601 with L-shaped structures, which are opened on the first control ring 402 . Both the drive shaft 3 and the first control ring 402 are provided with a screw-on blocking block 602 matching the screw-on insertion groove 601 .

The screw-in groove 601 and the guide ring 302 control the rotation range of the drive shaft 3 to be matched, so as to realize the separation or connection between the drive shaft 3, the first control ring 402 and the fixing ring 303. The opening of the inserting groove 601 is an inclined structure, which ensures that the screw-connecting block 602 can be fitted with the rotating inserting groove 601 more easily.

The fixing ring 303 includes an outer ring 304 that is slidably connected to the mounting seat 2 through a spring, and an inner ring 305 that is rotatably connected to the inner side of the outer ring 304. The inner ring 305 is connected to the first control ring 402 through the fitting of the screwing block 602 and the screwing groove 601 , and the outer ring 304 can drive the inner ring 305 to perform a certain range of movement on the mounting seat 2 through a spring, so as to Compensate for the height difference when the drive shaft 3 is rotated through the guide ring 302 , so that the drive shaft 3 is disconnected from the connection with the first control ring 402 and at the same time realizes the connection between the first control ring 402 and the inner ring 305 , at this time, the inner ring 305 can support the first control ring 402 , so that the transformer bushing 12 is kept fixed by the positioning and clamping plate 4 .

The drive shaft 3 includes an outer shaft 306 and an inner shaft 307 slidably connected to the outer shaft 306. The first control ring 402 is connected to the outer shaft 306. After the outer shaft 306 drives the positioning clamping plate 4 to be clamped on the transformer bushing 12, The inner shaft 307 is driven to move, one end of the plurality of follower clamping plates 5 facing the driving shaft 3 is rotatably connected with the second connecting rod 501, and the other end of the first connecting rod 401 is rotatably connected with the inner shaft 307 fixed With the connected second control ring 502 , the inner shaft 307 drives the second control ring 502 to synchronously clamp the plurality of follower clamping plates 5 on the transformer terminals 13 .

In order to ensure the stability of the drive shaft 3 during movement, a guide rod fixed on the mounting base 2 can be slidably connected to the inner shaft 307. The guide rod restricts the movement direction of the entire drive shaft 3. On the outer shaft 306 After disconnecting from the connection with the first control ring 402, the movement of the drive shaft 3 will enter the second stage, that is, when the drive shaft 3 continues to move, the movement of the inner shaft 307 will be driven by the outer shaft 306, and the movement of the inner shaft 307 will be driven by the movement of the inner shaft 307. To drive the movement of the second control loop 502, the second control loop 502 further enables the plurality of follower clamping plates 5 to move synchronously, so that they can be clamped on the transformer terminals 13, so as to realize the operation of the transformer to be tested. normal connection.

The mounting base 2 is provided with a self-locking buckle 8 for driving the drive shaft 3 to move in the vertical direction. The self-locking buckle 8 includes a push rod 801 rotatably connected to the mounting base 2 through a rotating shaft, and a push rod 801 rotatably connected to the outer shaft 306 Away from the connecting post 802 at one end of the positioning splint, the connecting post 802 is rotatably connected to the push rod 801 through a connecting rod.

The self-locking hasp 8 here is an existing fixing method, that is, mechanical self-locking is realized through the principle of dead point, and is mainly used to drive the movement of the drive shaft 3 to ensure that the follower clamping plate 5 is clamped at the transformer terminal. After 13 is installed, the position of the entire drive shaft 3 can be fixed, which can ensure the stability of the positioning clamping plate 4 and the follow-up clamping plate 5. In the actual use process, the user can make corresponding adjustments according to their needs. Adjustment.

The overall use process is as follows: rotating the push rod 801 will first drive the movement of the outer shaft 306, when the outer shaft 306 is moving, it can drive the movement of the first control ring 402, and the movement of the first control ring 402 can be through the first connection. The rod 401 synchronously drives a plurality of positioning clamping plates 4 to be clamped on the transformer bushing 12. At this time, the movement continues, and the outer shaft 306 is rotated through the fitting of the guide ring 302 and the track groove 301. The rotation will synchronously drive the rotation of the inner ring 305 through the track groove 301 , and continue to lift the outer shaft 306 . Under the action of the rotation of the inner ring 305, it is fixed with the inner ring 305 to complete the fixing of the transformer bushing 12 in the first stage.

When fixing the transformer bushing 12 in the first stage, since the positioning clamping plate 4 and the follower clamping plate 5 are both arranged in an annular array with respect to the central axis of the drive shaft 3, the transformer bushing is fixed by the positioning clamping plate 4. When 12 is fixed, the position of the follower clamping plate 5 can be fixed, and the outer shaft 306 can continue to move, which will drive the movement of the inner shaft 307, and the movement of the inner shaft 307 can drive the movement of the second control ring 502, and further Then, the synchronous movement of the plurality of follower clamping plates 5 can be realized through the second connecting rod 501, so that they can be clamped on the transformer terminal 13. At this time, the push rod 801 will turn 180 degrees and cross the dead center to realize self-locking. , so that the current position of the inner shaft 307 can be fixed, so as to achieve a stable connection between the test power supply and the transformer terminal 13 .

The above embodiments are only exemplary embodiments of the present application, and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present application.

Claims (8)

1. A transformer testing fixture, comprising a mounting bracket (1) that can be vertically slid and adjusted in height, characterized in that: a plurality of mounting brackets (1) are provided on the mounting bracket (1) that can slide on the mounting bracket (1). The moving mounting seat (2) is provided with a drive shaft (3) coaxially arranged with the mounting seat (2) on the mounting seat (2), and a plurality of sliding connections are connected to the drive shaft (3) The positioning clamping plate (4) and the plurality of following clamping plates (5) on the mounting seat (2), the plurality of said positioning clamping plates (4) and the plurality of following clamping plates (5) are Regarding the annular array arrangement of the central axis of the drive shaft (3), the follow-up clamping plate (5) is electrically connected to the external test power supply through a cable, and the movement of the drive shaft (3) makes the positioning clamping plate (4) clamp Hold on the transformer bushing (12), position the follower clamping plate (5), and further move the drive shaft (3), so that the follower holding plate (5) is clamped on the transformer terminal (5). 13) On, it is electrically connected to the external test power supply; The positioning clamping plate (4) and the follow-up clamping plate (5) are arranged alternately; One end of the plurality of positioning clamping plates (4) facing the drive shaft (3) is rotatably connected with a first connecting rod (401), and the other end of the first connecting rod (401) is rotatably connected with a first connecting rod (401). A first control ring (402) connected to the drive shaft (3), the drive shaft (3) drives the first control ring (402) to synchronously clamp a plurality of positioning clamping plates (4) on the transformer bushing (12), and the mounting seat (2) is moved by the clamping force, and the relative position of the follow-up clamping plate (5) and the transformer terminal (13) is positioned. 2 . The transformer detection fixture according to claim 1 , wherein the drive shaft ( 3 ) is connected to the drive shaft ( 3 ) through a first screwing buckle ( 6 ), and the drive shaft A plurality of track grooves (301) are arranged in a circular array on the side wall of the drive shaft (3) about the central axis of the drive shaft (3). A guide ring (302), which cooperates with the track groove (301) to rotate the drive shaft (3), is also sleeved on the drive shaft (3) through a spring sliding connection on the mounting seat (2), and is connected to the track. The groove (301) cooperates with a rotating fixing ring (303), the fixing ring (303) is connected with the first control ring (402) through the second screwing buckle (7), and the drive shaft (3) is in the During the movement, the guide ring (302) is rotated, so that the drive shaft (3) is disengaged from the first control ring (402) through the first screwing buckle (6), and at the same time, the fixing ring (303) is passed through the second screw. The connecting buckle (7) is connected with the first control ring (402). 3. A transformer testing fixture according to claim 2, characterized in that: both the first screw-connected buckle (6) and the second screw-connected buckle (7) include a set of a first control loop ( 402), and it is an L-shaped screw-in groove (601), the drive shaft (3) and the first control ring (402) are both provided with a screw-in groove (601) matching the screw-in groove (601). Connection block (602). 4 . The transformer detection fixture according to claim 3 , wherein the fixing ring ( 303 ) comprises an outer ring ( 304 ) that is slidably connected to the mounting seat ( 2 ) through a spring, and is rotatably connected to the mounting seat ( 2 ). 5 . The inner ring (305) on the inner side of the outer ring (304), the inner ring (305) rotates on the outer ring (304) by cooperating with the track groove (301), so that the inner ring (305) passes through the screwing block ( 602 ) is connected to the first control ring ( 402 ) by being fitted into the screw fitting groove ( 601 ). 5. A transformer testing fixture according to claim 1, characterized in that: the drive shaft (3) comprises an outer shaft (306) and an inner shaft (307) slidably connected to the outer shaft (306), so The first control ring (402) is connected with the outer shaft (306), and the outer shaft (306) drives the positioning clamping plate (4) to be clamped on the transformer bushing (12), and drives the inner shaft (307) Exercise. 6 . The transformer detection fixture according to claim 5 , wherein a second connecting rod ( 501), and the other end of the first connecting rod (401) is rotatably connected with a second control ring (502) fixedly connected with the inner shaft (307), the inner shaft (307) drives the second control ring by driving (502) The plurality of follower clamping plates (5) are synchronously clamped on the transformer terminals (13). 7. A transformer testing fixture according to claim 5, characterized in that: the mounting seat (2) is provided with a self-locking hasp (8) for driving the drive shaft (3) to move in the vertical direction ), the self-locking buckle (8) includes a push rod (801) rotatably connected to the mounting seat (2) through a rotating shaft, and a connecting post (802) rotatably connected to the outer shaft (306) at one end away from the positioning splint , the connecting column (802) is rotatably connected with the push rod (801) through the connecting rod, the push rod (801) rotates around the rotation axis, and drives the connecting column (802) to make the drive shaft (3) move in the vertical direction. 8 . The transformer testing fixture according to claim 1 , wherein an expansion ring ( 9 ) having an annular structure is fixed at the bottom edge of the mounting seat ( 2 ). ) is provided with a chute (10) matching the expansion ring (9), the mounting seat (2) slides on the mounting bracket (1) through the fitting of the expansion ring (9) and the chute (10), A plurality of rolling steel balls (11) for reducing the friction force between the expansion ring (9) and the chute (10) are arranged at the bottom of the expansion ring (9).

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