Breaker high-voltage test device

Abstract

The invention discloses a circuit breaker high-voltage test device which comprises a base and a clamping plate, a plurality of universal locking wheels I are fixedly mounted at the bottom of the base, a placement frame I is fixedly connected to the top surface of the base, a protection pad I is fixedly arranged in a cavity formed by the placement frame I and the base, and a withstand voltage detection voltage regulator is placed on the protection pad I. A moving block can be moved to a proper position by driving a second air cylinder, a worker can turn over a push rod and then push the device, a voltage-withstanding detection voltage regulator and a test transformer can be conveniently moved, when the device moves to the proper position, a first lead screw can be driven by a driving motor to rotate, and a moving seat and the test transformer are driven to move to the proper position; the test transformer and the withstand voltage detection voltage regulator can be kept at a proper spacing distance, more labor is saved, a worker does not need to carry and adjust the test transformer and the withstand voltage detection voltage regulator manually all the time, a plurality of cables used for operation can be wound and cable joints can be clamped after the cables are used, and the cables can be stored and arranged conveniently.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical equipment, and particularly to a high-voltage test device for a circuit breaker. Background Art

[0002] With the rapid development of social economy, power consumption has been continuously increasing on the premise of meeting the development needs, and users have put forward higher requirements for the reliability and quality of power supply. Among them, the reasonable application of 10kV pole-mounted vacuum circuit breakers in the connection, sectioning and branch lines of the distribution network has made great contributions to improving the power supply reliability. Before the installation and use of 10KV pole-mounted vacuum circuit breakers, high-voltage tests are required to detect whether their quality meets the standards. The phase-to-phase withstand voltage test of the circuit breaker is a key step to verify the insulation performance of the equipment, mainly used to detect whether the phase-to-phase insulation of the circuit breaker meets the standards under high-voltage environments. Before the test, it is necessary to clarify the equipment parameters and test standards to ensure the safety and effectiveness of the operation.

[0003] For example, the Chinese utility model patent with the authorization publication number of CN215067141U discloses a special device for the power frequency withstand voltage test of a fixed vacuum circuit breaker and a bus, belonging to the technical field of auxiliary devices for electrical equipment tests. The technical solution is: the wiring clip (1) is clamped on the wire row or the internal metal part of the contact box of the fixed vacuum circuit breaker and is connected to the screw cap (2) through a flexible pipe, and a flat wiring terminal (3) is arranged inside the screw cap (2); one end of the screw cap (2) is threadedly connected to the insulating shielding sleeve (5), and the other end of the insulating shielding sleeve is connected to the insulating movable bracket, and the height of the insulating movable bracket is adjustable. During the power frequency withstand voltage test of the present invention, the test personnel can stably clamp the wiring clip on the wire row or the metal part of the contact box, without manually winding the high-voltage bare copper wire, improving the efficiency and safety of the test operation. The height of the insulating movable bracket can be adjusted, so as to place the exposed high-voltage bare copper wire at a reasonable height and position, avoiding many dangerous factors during the operation in the narrow space of the switch cabinet.

[0004] However, when the existing high-voltage test device for a circuit breaker is used, a withstand voltage test is carried out by setting a withstand voltage machine and a withstand voltage machine operation platform. During the operation, the shortest distance between the withstand voltage machine (i.e., the test transformer) and this withstand voltage machine operation platform (i.e., the voltage regulator) cannot be less than 1.5m. During the test, the staff needs to stand at the voltage regulator to apply voltage. The high-voltage application of the withstand voltage machine (i.e., the test transformer) must be increased to more than 20,000 - 30,000 volts at least. Therefore, there must be an interval distance. Before the operation, the staff needs to move the withstand voltage machine and the withstand voltage machine operation platform to the operation area respectively and then manually move them to keep a suitable interval distance, which is rather laborious.

[0005] Therefore, we propose a high-voltage test device for a circuit breaker to solve the above problems. Summary of the Invention

[0006] The object of the present invention is to provide a high-voltage test device for a circuit breaker to solve the problems raised in the above-mentioned background art.

[0007] To achieve the above object, the present invention provides the following technical solution: A high-voltage test device for a circuit breaker, including a base and a clamping plate. A plurality of universal locking wheels I are fixedly installed at the bottom of the base. A placement frame I is fixedly connected to the top surface of the base. A protective pad I is fixedly arranged in the cavity formed by the placement frame I and the base. A withstand voltage detection voltage regulator is placed on the protective pad I;

[0008] An installation groove I is opened on one side of the base. A motor is fixedly installed in the installation groove I. One end of a connecting rod I is fixedly connected to the motor shaft. The other end of the connecting rod I is fixedly connected to a lead screw I. A chute is opened on one side of the base. A moving seat is slidably connected in the chute. A threaded sleeve I is embedded in the moving seat. The threaded sleeve I is threadedly connected to the lead screw I. A placement frame II is fixedly connected to the top surface of the moving seat. A protective pad II is fixedly arranged in the cavity formed by the placement frame II and the moving seat. A test transformer is placed on the protective pad II. A plurality of support columns are fixedly installed at the bottom of the moving seat. Universal locking wheels II are fixedly installed at the bottom of the support columns;

[0009] Installation grooves III are respectively opened on both sides of the base. A cylinder II is fixedly installed in the installation groove III. One end of a connecting rod III is fixedly connected to the output end of the piston rod of the cylinder II. The other end of the connecting rod III is fixedly connected to a moving block. Notches are respectively opened on both sides of the base. The moving block is slidably connected to the notch. The number of the moving blocks is two. Fixed shafts are respectively fixedly connected to the mutually remote sides of the two moving blocks at one ends. Limiting circular plates are fixedly connected to the other ends of the fixed shafts. A push rod is rotatably connected to the outer surface of the fixed shaft.

[0010] Preferably, limiting blocks are respectively fixedly connected to the top surface and the bottom surface of the moving seat. Limiting grooves are respectively opened on the top surface and the bottom surface of the inner part of the chute. The limiting blocks are slidably connected to the limiting grooves.

[0011] Preferably, the push rod contacts the base and the limiting circular plate. The horizontal cross-sectional shape of the push rod is C-shaped.

[0012] Preferably, a sliding block is fixedly connected to the bottom surface of the moving block. A sliding groove is opened on the bottom surface of the notch. The sliding block is slidably connected to the sliding groove. A limiting stop block is fixedly connected to one side of the moving block. The push rod contacts the limiting stop block.

[0013] Preferably, an installation groove II is opened on the bottom surface of the base. A cylinder I is fixedly installed on the top surface of the inner part of the installation groove II. One end of a connecting rod II is fixedly connected to the output end of the piston rod of the cylinder I. The other end of the connecting rod II is fixedly connected to a pressing plate. An anti-slip pad is fixedly arranged on the bottom surface of the pressing plate.

[0014] Preferably, a plurality of fixing blocks are fixedly connected to the outer surface of the test transformer. One side of the fixing block is fixedly connected to a winding rod. Grooves I are respectively formed in the top and bottom surfaces of the fixing block, and a rubber pad I is fixedly arranged on the inner wall of the groove I.

[0015] Preferably, T-shaped limiting rotating blocks are respectively rotatably connected to both ends inside the fixing block. One end of a second lead screw is fixedly connected to the end of the T-shaped limiting rotating block. The other end of the second lead screw is fixedly connected to one end of a rotating rod. The other end of the rotating rod is fixedly connected to a rotating block, and a plurality of convex blocks are fixedly arranged on the outer surface of the rotating block.

[0016] Preferably, the number of the clamping plates is multiple. Threaded sleeves II are respectively embedded in the multiple clamping plates. The threaded sleeve II is threadedly connected to the second lead screw. A groove II is formed in one surface of the clamping plate, and a rubber pad II is fixedly arranged on the inner wall of the groove II.

[0017] Preferably, one end of a limiting rod is fixedly connected to both ends of the top surface and both ends of the bottom surface of the fixing block. The other end of the limiting rod is fixedly connected to a limiting plate. Limiting holes are respectively formed in both ends of one surface of the clamping plate, and the limiting rod is slidably connected to the limiting hole.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] By arranging a first placement frame, a first protective pad, a second placement frame, a second protective pad, etc., the present invention can place a withstand voltage detection voltage regulator and a test transformer. By arranging a second cylinder, a moving block, a fixed shaft, a limiting circular plate, a push rod, a base, a first universal locking wheel, a moving seat, a support column, a second universal locking wheel, etc., the moving block can be moved to a proper position by driving the second cylinder. After the push rod is turned over by a worker, the device can be pushed, facilitating the movement of the withstand voltage detection voltage regulator and the test transformer. When moved to a proper position, by arranging a motor and a first lead screw, the first lead screw can be driven to rotate by driving the motor, driving the moving seat and the test transformer to move. When moved to a proper position, the test transformer and the withstand voltage detection voltage regulator can be kept at a proper interval distance, which is more labor-saving and does not require the worker to manually move and adjust all the time, being more convenient for the worker to use. By arranging fixing blocks, grooves I, rubber pads I, second lead screws, rotating rods, rotating blocks, clamping plates, grooves II, rubber pads II, winding rods, limiting rods, etc., multiple cables used in the operation can be wound respectively and the cable connectors can be clamped after use, facilitating the storage and arrangement of the cables and avoiding the situation of entanglement when the cables are placed together. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the present invention;

[0021] Figure 2 is a front sectional structural diagram of the present invention;

[0022] Figure 3Schematic top - view sectional structure diagram of the local structure of the present invention;

[0023] Figure 4 Schematic front - view sectional structure diagram of the local structure of the present invention;

[0024] Figure 5 Schematic diagram of the local structure of the present invention;

[0025] Figure 6 Schematic top - view sectional structure diagram of the local structure of the present invention;

[0026] Figure 7 Schematic side - view sectional structure diagram of the local structure of the present invention.

[0027] In the figure: 1. Base; 2. Universal locking wheel 1; 3. Placing frame 1; 4. Protection pad 1; 5. Pressure - resistance detection voltage regulator; 6. Slide groove; 61. Limit groove; 7. Installation groove 1; 8. Motor; 9. Connecting rod 1; 10. Lead screw 1; 11. Moving seat; 111. Threaded sleeve 1; 12. Limit block; 13. Support column; 14. Universal locking wheel 2; 15. Placing frame 2; 16. Protection pad 2; 17. Test transformer; 18. Installation groove 2; 19. Cylinder 1; 191. Connecting rod 2; 20. Pressing plate; 21. Anti - slip pad; 22. Installation groove 3; 23. Cylinder 2; 231. Connecting rod 3; 24. Moving block; 241. Sliding block; 25. Fixed shaft; 26. Limit circular plate; 27. Push rod; 28. Notch; 281. Sliding groove; 29. Limit stop block; 30. Fixed block; 301. Groove 1; 31. Rubber pad 1; 32. T - shaped limit rotating block; 33. Lead screw 2; 34. Rotating rod; 35. Rotating block; 351. Convex block; 36. Clamping plate; 361. Threaded sleeve 2; 362. Limit hole; 363. Groove 2; 37. Rubber pad 2; 38. Limit rod; 39. Limit plate; 40. Winding rod. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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, rather than 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.

[0029] Embodiment 1:

[0030] Please refer to Figures 1-7, which is the first embodiment of the present invention. The present invention provides a technical solution: a high-voltage test device for a circuit breaker, including a base 1 and a clamping plate 36. A plurality of universal locking wheels 2 are fixedly installed at the bottom of the base 1. A placement frame 3 is fixedly connected to the top surface of the base 1. A protective pad 4 is fixedly arranged in the cavity formed by the placement frame 3 and the base 1. A withstand voltage detection voltage regulator 5 is placed on the protective pad 4. The protective pad 4 is provided to protect the withstand voltage detection voltage regulator 5;

[0031] An installation groove 7 is opened on one side of the base 1. A motor 8 is fixedly installed in the installation groove 7. One end of a connecting rod 9 is fixedly connected to the rotating shaft of the motor 8. The other end of the connecting rod 9 is fixedly connected to one end of a lead screw 10. A sliding groove 6 is opened on one side of the base 1. A moving seat 11 is slidably connected in the sliding groove 6. A threaded sleeve 111 is embedded in the moving seat 11. The threaded sleeve 111 is threadedly connected to the lead screw 10. A placement frame 15 is fixedly connected to the top surface of the moving seat 11. A protective pad 16 is fixedly arranged in the cavity formed by the placement frame 15 and the moving seat 11. A test transformer 17 is placed on the protective pad 16. The protective pad 16 is provided to protect the test transformer 17. A plurality of support columns 13 are fixedly installed at the bottom of the moving seat 11. Universal locking wheels 14 are fixedly installed at the bottom of the support columns 13;

[0032] Installation grooves 22 are respectively opened on both sides of the base 1. Cylinders 23 are fixedly installed in the installation grooves 22. One end of a connecting rod 231 is fixedly connected to the output end of the piston rod of the cylinder 23. The other end of the connecting rod 231 is fixedly connected to a moving block 24. Notches 28 are respectively opened on both sides of the base 1. The moving block 24 is slidably connected to the notch 28. The number of the moving blocks 24 is two. Fixing shafts 25 are respectively fixedly connected to one side of the two moving blocks 24 away from each other. A limiting circular plate 26 is fixedly connected to the other end of the fixing shaft 25. A push rod 27 is rotatably connected to the outer surface of the fixing shaft 25.

[0033] Embodiment 2:

[0034] Please refer to Figures 1-7 , which is the second embodiment of the present invention. This embodiment is based on the previous embodiment. Limit blocks 12 are respectively fixedly connected to the top surface and the bottom surface of the moving seat 11. Limit grooves 61 are respectively opened on the top surface and the bottom surface of the sliding groove 6. The limit blocks 12 are slidably connected to the limit grooves 61, which can limit the moving range of the moving seat 11 and improve the moving stability of the moving seat 11.

[0035] The push rod 27 contacts the base 1, and the push rod 27 contacts the limiting circular plate 26, which can limit the push rod 27 and prevent the push rod 27 from deflecting left and right. The horizontal cross-sectional shape of the push rod 27 is C-shaped.

[0036] The bottom surface of the moving block 24 is fixedly connected to the sliding block 241. A sliding groove 281 is formed on the inner bottom surface of the notch 28. The sliding block 241 is slidably connected to the sliding groove 281. A limiting stop block 29 is fixedly connected to one side of the moving block 24. The push rod 27 contacts the limiting stop block 29, and the push rod 27 can be flipped to maintain a horizontal state.

[0037] An installation groove two 18 is formed on the bottom surface of the base 1. A cylinder one 19 is fixedly installed on the inner top surface of the installation groove two 18. The output end of the piston rod of the cylinder one 19 is fixedly connected to one end of a connecting rod two 191. The other end of the connecting rod two 191 is fixedly connected to a pressing plate 20. An anti-slip pad 21 is fixedly arranged on the bottom surface of the pressing plate 20 to improve the stability of the placement of the base 1.

[0038] A plurality of fixing blocks 30 are fixedly connected to the outer surface of the test transformer 17. A winding rod 40 is fixedly connected to one side of the fixing block 30. Grooves one 301 are respectively formed on the top surface and the bottom surface of the fixing block 30. A rubber pad one 31 is fixedly arranged on the inner wall of the groove one 301.

[0039] T-shaped limiting rotating blocks 32 are respectively rotatably connected to both ends inside the fixing block 30. One end of a lead screw two 33 is fixedly connected to the end of the T-shaped limiting rotating block 32. The other end of the lead screw two 33 is fixedly connected to one end of a rotating rod 34. The other end of the rotating rod 34 is fixedly connected to a rotating block 35. A plurality of convex blocks 351 are fixedly connected to the outer surface of the rotating block 3, which facilitates the rotation of the rotating block 35.

[0040] The number of the clamping plates 36 is multiple. Threaded sleeves two 361 are respectively embedded inside the multiple clamping plates 36. The threaded sleeves two 361 are threadedly connected to the lead screw two 33. A groove two 363 is formed on one side of the clamping plate 36. A rubber pad two 37 is fixedly arranged on the inner wall of the groove two 363. By setting the rubber pad one 31 and the rubber pad two 37, the cable connector can be protected to prevent hard contact. After use, the multiple cables for test wiring can be wound and stored. One end of the cable can be placed on the rubber pad one 31 on the upper groove one 301 of the fixing block 30. By rotating the rotating block 35, the lead screw two 33 and the T-shaped limiting rotating block 32 can be driven to rotate, and the clamping plate 36 can be driven to move, so that the rubber pad two 37 arranged at the bottom groove two 363 of the clamping plate 36 moves downwards to contact the cable connector, and the connector at one end of the cable is clamped and fixed. Then the cable can be wound around the winding rod 40. After winding, the cable connector at the other end can be clamped and fixed in the same way at the lower end of the fixing block 30, which is convenient for the storage and arrangement of the cable and avoids the situation of entanglement caused by placing the cables together.

[0041] One end of a limiting rod 38 is fixedly connected to both ends of the top surface and both ends of the bottom surface of the fixing block 30. The other end of the limiting rod 38 is fixedly connected to a limiting plate 39. By setting the limiting plate 39, the moving range of the clamping plate 36 can be limited. Limiting holes 362 are respectively formed at both ends of one side of the clamping plate 36. The limiting holes 362 are slidably connected to the limiting rod 38. The clamping plate 36 can be limited during the movement of the clamping plate 36, so that the clamping plate 36 maintains a vertical movement and the stability of the movement of the clamping plate 36 is improved.

[0042] Embodiment 3:

[0043] Please refer to Figures 1-7 , which is the third embodiment of the present invention. Based on the above two embodiments, when the present invention is actually used, the second cylinder 23 is externally connected to a power source. By driving the second cylinder 23, the moving block 24 is driven to move, and at the same time, the push rod 27 can be driven to move. When it moves to a suitable position, the staff can turn the push rod 27 to a suitable position and push it. Cooperating with the first universal locking wheel 2 and the second universal locking wheel 14, the whole device can be moved. By placing the withstand voltage detection voltage regulator 5 on the first protective pad 4 and placing the test transformer 17 on the second protective pad 16, it is convenient to move the withstand voltage detection voltage regulator 5 and the test transformer 17. When it moves to a suitable position, the first universal locking wheel 2 provided at the bottom of the base 1 can be locked. The first cylinder 19 is externally connected to a power source. By starting the first cylinder 19, the pressing plate 20 and the anti-slip pad 21 are driven to move downward, so that the anti-slip pad 21 contacts the ground, improving the stability of the base 1. Turn the push rod 27 back to its original position and keep it horizontal. By driving the second cylinder 23, the push rod 27 is moved back to its original position. The motor 8 is externally connected to a power source. By starting the motor 8, the first connecting rod 9 and the first lead screw 10 are driven to rotate, driving the moving seat 11 and the test transformer 17 to move, and the second universal locking wheel 14 rolls accordingly. When it moves to a suitable position, the test transformer 17 and the withstand voltage detection voltage regulator 5 can be kept at a suitable interval distance. Lock the second universal locking wheel 14, which is more labor-saving and does not require the staff to manually move and adjust all the time, making it more convenient for the staff to use. After adjustment, the test wiring can be connected to carry out the high-voltage test work of the circuit breaker.

[0044] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-voltage test device for a circuit breaker, comprising a base (1) and a clamping plate (36), characterized in that: A plurality of universal locking wheels one (2) are fixedly installed at the bottom of the base (1). A placing frame one (3) is fixedly connected to the top surface of the base (1). A protective pad one (4) is fixedly arranged in the cavity formed by the placing frame one (3) and the base (1). A voltage withstand detection regulator (5) is placed on the protective pad one (4). An installation groove one (7) is opened on one side of the base (1). A motor (8) is fixedly installed in the installation groove one (7). One end of a connecting rod one (9) is fixedly connected to the rotating shaft of the motor (8). The other end of the connecting rod one (9) is fixedly connected to a lead screw one (10). A sliding groove (6) is opened on one side of the base (1). A moving seat (11) is slidably connected in the sliding groove (6). A thread sleeve one (111) is embedded in the moving seat (11). The thread sleeve one (111) is threadedly connected to the lead screw one (10). A placing frame two (15) is fixedly connected to the top surface of the moving seat (11). A protective pad two (16) is fixedly arranged in the cavity formed by the placing frame two (15) and the moving seat (11). A test transformer (17) is placed on the protective pad two (16). A plurality of support columns (13) are fixedly installed at the bottom of the moving seat (11). A universal locking wheel two (14) is fixedly installed at the bottom of the support column (13). Installation grooves three (22) are respectively opened on both sides of the base (1). A cylinder two (23) is fixedly installed in the installation groove three (22). One end of a connecting rod three (231) is fixedly connected to the output end of the piston rod of the cylinder two (23). The other end of the connecting rod three (231) is fixedly connected to a moving block (24). Slot openings (28) are respectively opened on both sides of the base (1). The moving block (24) is slidably connected to the slot opening (28). The number of the moving blocks (24) is two. One ends of fixed shafts (25) are respectively fixedly connected to the mutually remote sides of the two moving blocks (24). A limiting circular plate (26) is fixedly connected to the other end of the fixed shaft (25). A push rod (27) is rotatably connected to the outer surface of the fixed shaft (25).

2. The high-voltage test device for a circuit breaker according to claim 1, characterized in that: Limiting blocks (12) are respectively fixedly connected to the top surface and the bottom surface of the moving seat (11). Limiting grooves (61) are respectively opened on the top surface and the bottom surface of the inner part of the sliding groove (6). The limiting blocks (12) are slidably connected to the limiting grooves (61).

3. The high-voltage test device for a circuit breaker according to claim 2, characterized in that: The push rod (27) contacts the base (1), the push rod (27) contacts the limiting circular plate (26), and the horizontal cross-sectional shape of the push rod (27) is C-shaped.

4. The high-voltage test device for a circuit breaker according to claim 3, characterized in that: A sliding block (241) is fixedly connected to the bottom surface of the moving block (24). A sliding groove (281) is opened on the bottom surface of the slot opening (28). The sliding block (241) is slidably connected to the sliding groove (281). A limiting stop block (29) is fixedly connected to one side of the moving block (24). The push rod (27) contacts the limiting stop block (29).

5. A high-voltage test device for a circuit breaker according to claim 4, characterized in that: An installation groove two (18) is opened on the bottom surface of the base (1). A cylinder one (19) is fixedly installed on the top surface of the installation groove two (18). One end of a connecting rod two (191) is fixedly connected to the output end of the piston rod of the cylinder one (19). The other end of the connecting rod two (191) is fixedly connected to a pressing plate (20). An anti-slip pad (21) is fixedly arranged on the bottom surface of the pressing plate (20).

6. The high-voltage test device for a circuit breaker according to claim 5, characterized in that: A plurality of fixing blocks (30) are fixedly connected to the outer surface of the test transformer (17). One side of the fixing block (30) is fixedly connected to a winding rod (40). First grooves (301) are respectively formed in the top surface and the bottom surface of the fixing block (30), and a first rubber pad (31) is fixedly arranged on the inner wall of the first groove (301).

7. The high-voltage test device for a circuit breaker according to claim 6, wherein: T-shaped limiting rotating blocks (32) are respectively rotatably connected to two ends inside the fixing block (30). One end of a second lead screw (33) is fixedly connected to the end of the T-shaped limiting rotating block (32). The other end of the second lead screw (33) is fixedly connected to one end of a rotating rod (34). The other end of the rotating rod (34) is fixedly connected to a rotating block (35), and a plurality of convex blocks (351) are fixedly connected to the outer surface of the rotating block (35).

8. A high-voltage test device for a circuit breaker according to claim 7, characterized in that: The number of the clamping plates (36) is multiple. Second threaded sleeves (361) are respectively embedded in the multiple clamping plates (36). The second threaded sleeve (361) is in threaded connection with the second lead screw (33). A second groove (363) is formed in one surface of the clamping plate (36), and a second rubber pad (37) is fixedly arranged on the inner wall of the second groove (363).

9. The high-voltage test device for a circuit breaker according to claim 8, wherein: One end of a limiting rod (38) is fixedly connected to each of the two ends of the top surface and the two ends of the bottom surface of the fixing block (30). The other end of the limiting rod (38) is fixedly connected to a limiting plate (39). Limiting holes (362) are respectively formed in the two ends of one surface of the clamping plate (36), and the limiting holes (362) are slidably connected to the limiting rod (38).

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