A kind of operating lever separable circuit breaker pliers with self-locking function

Abstract

The application discloses an operating rod separable circuit breaker connecting clamp with self-locking function, and relates to the field of electric power operation tools.The connecting clamp comprises telescopic rod units and clamping heads arranged on the telescopic rod units.The telescopic rod units are sequentially connected, and the telescopic rod units are internally provided with motors and are driven by screw rod pairs to realize telescopic extension, so that the working personnel do not need to perform high-altitude operation through a lifting vehicle or a ladder, and the labor intensity is greatly reduced.The clamping head comprises a clamping head body, a fixed clamping head and a movable clamping head, is equipped with clamping head motors, screw rods and other components, and realizes automatic opening and closing of the clamping head, so that the connecting clamp can more easily clamp and release high-voltage lines, and the operation convenience is improved.The length of the connecting clamp is adjusted simply, the maximum opening is large, and clamping is reliable, so that the connecting clamp is not prone to falling during installation even if subjected to external forces such as wind, and thus the threat to the personal safety of the working personnel is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric power operating tools, and particularly relates to a circuit breaker connecting clamp with separable operating rod and self-locking function. BACKGROUND

[0002] At present, the external lead position of electrical equipment in many substations is high, and the following problems are often encountered during electrical test on the equipment: first, the worker needs to ride an elevator or use a ladder to place the connecting clamp on the high-voltage line, and the placed connecting clamp is easy to fall under the action of wind, thereby endangering the personal safety of the worker; second, the traditional connecting clamp is high in labor intensity and unsafe to operate, and the clamping process will also cause impact on the cable and damage the equipment; third, the maximum opening of the existing overhead connecting clamp is small, generally only 7 cm, but it is not enough to meet the test when the 500kV circuit breaker loop resistance is tested. SUMMARY

[0003] In view of the above problems, the present application provides a circuit breaker connecting clamp with separable operating rod and self-locking function, which can solve the problems of difficult length adjustment, small maximum opening and unstable clamping of the existing connecting clamp.

[0004] To achieve the above purpose, the present application adopts the following technical scheme:

[0005] A circuit breaker connecting clamp with separable operating rod and self-locking function comprises a telescopic rod unit and a chuck head arranged on the telescopic rod unit,

[0006] The telescopic rod unit is a plurality of telescopic rod units connected in sequence; the telescopic rod unit comprises an outer cylinder, a telescopic rod, a telescopic rod motor, a first lead screw and a first lead screw nut, the telescopic rod is sleeved in the outer cylinder and can axially extend and retract along the outer cylinder, the first lead screw nut is fixedly installed in the telescopic rod, the telescopic rod motor is fixedly installed in one end of the outer cylinder and connected with the first lead screw to drive the first lead screw to rotate, and the first lead screw is threadedly connected with the first lead screw nut.

[0007] The chuck head comprises a chuck head body, a fixed chuck head, a movable chuck head, a chuck head motor, a second lead screw and a second lead screw nut, the fixed chuck head is installed at the end of the telescopic rod of the telescopic rod unit, a sliding groove is formed in one side of the chuck head body along the extending direction of the chuck head body, the chuck head body is installed in one end of the sliding groove away from the telescopic rod unit, the movable chuck head is slidably arranged in the sliding groove, the second lead screw nut is fixedly installed on the movable chuck head, the chuck head motor is fixedly installed on the chuck head body and connected with the second lead screw to drive the second lead screw to rotate, and the second lead screw is threadedly connected with the second lead screw nut.

[0008] Further, the telescopic rod unit is further provided with a first photoelectric switch for detecting the maximum stroke of the telescopic rod.

[0009] Further, the end of the telescopic rod of one of the two connected telescopic rod units is connected with the end of the outer cylinder of the other telescopic rod unit.

[0010] Further, the outer cylinder and the telescopic rod of the telescopic rod unit closest to the clamp head are made of epoxy resin, and the outer cylinder and the telescopic rod of the telescopic rod unit farthest from the clamp head are made of carbon fiber.

[0011] Further, the connection mode of the two connected telescopic rod units is screw connection or clamping.

[0012] Further, the clamp body is provided with a limiting slot penetrating the sliding groove on the other side relative to the sliding groove, the movable clamp is provided with a limiting block, the limiting block penetrates the limiting slot, and the end of the limiting block penetrating the limiting slot is fixedly provided with a limiting block.

[0013] Further, the fixed clamp is connected with the clamp body through an elastic member, and the elastic member is located on the side of the fixed clamp away from the movable clamp.

[0014] Further, the fixed clamp is provided with a limiting block, the limiting block penetrates the limiting slot, and the end of the limiting block penetrating the limiting slot is fixedly provided with a limiting block.

[0015] Further, the clamp body is further provided with a second photoelectric switch for detecting the position of the movable clamp when the movable clamp moves to the maximum opening.

[0016] Further, the fixed clamp and the movable clamp are provided with anti-skid lines on the opposite sides.

[0017] Compared with the prior art, the beneficial effects of the present application are:

[0018] By adopting a precise mechanical structure, clamping is realized, and even if the wire clamp is subjected to external forces such as wind during installation, it is not easy to fall, thereby greatly reducing the threat to the personal safety of the workers;

[0019] The telescopic rod unit is provided with a built-in motor, and the telescopic rod is driven through a screw pair to realize telescopic extension, so that the workers do not need to perform high-altitude operation through a lifting vehicle or a ladder, and the labor intensity is greatly reduced;

[0020] The clamp part is provided with a clamp motor, a screw rod and other components, and the automatic opening and closing of the clamp are realized, so that the wire clamp can more easily clamp and release the high-voltage line, and the operation convenience is improved;

[0021] The design of the chuck part allows the movable chuck to move in the sliding groove to adjust the distance from the fixed chuck, so that the size of the chuck opening is adjusted, and the high-standard test requirement of 500kV circuit breaker loop resistance test is met.

[0022] The epoxy resin material is adopted, has good insulation performance, effectively prevents the current from being transmitted to the worker through the connecting clamp, and further improves the operation safety.

[0023] The connecting clamp adopts modular design, the components are connected closely and easy to disassemble, so that the maintenance and maintenance work is more simple and convenient, and for the vulnerable components such as elastic members and motors, they are designed to be replaceable, which reduces the maintenance cost and time. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description.

[0025] Figure 1 It is a structure schematic view of the disconnecting circuit connecting clamp with separable operating rod and self-locking function of the present application.

[0026] Figure 2 It is a sectional view schematic view of the telescopic rod unit in the present application.

[0027] Figure 3 It is a structure schematic view of the chuck from one perspective in the present application.

[0028] Figure 4 It is a structure schematic view of the chuck from another perspective in the present application.

[0029] Figure 5 It is a partial sectional view schematic view of the chuck in the present application.

[0030] In the figure, the marks shown are: 10-telescopic rod unit; 11-outer cylinder; 12-telescopic rod; 13-telescopic rod motor; 14-first screw rod; 15-first screw rod nut; 16-first photoelectric switch; 20-chuck; 21-chuck body; 22-fixed chuck; 23-movable chuck; 24-chuck motor; 25-second screw rod; 26-second screw rod nut; 27-sliding groove; 28-limiting groove; 29-limiting block; 211-elastic member; 212-drum gear coupling; 213-second photoelectric switch; 215-wiring post; 30-circuit board; 40-power supply. DETAILED DESCRIPTION

[0031] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of the present application.

[0032] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0033] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For a person of ordinary skill in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances. In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0034] Please refer to Figures 1 to 5 The preferred embodiment of the present application provides a disconnecting circuit breaker connecting clamp with separable operating rod and self-locking function, which comprises a telescopic rod unit 10 and a chuck 20 arranged on the telescopic rod unit 10. The chuck 20 is installed at the front end position of the telescopic rod unit 10, and is used to realize clamping of high-voltage lines.

[0035] In the preferred embodiment, please refer to Figure 1 and Figure 2The telescopic rod unit 10 comprises an outer cylinder 11, a telescopic rod 12, a telescopic rod motor 13, a first screw rod 14 and a first screw rod nut 15. The telescopic rod 12 is a square hollow rod structure as a whole, is matched and sleeved in the outer cylinder 11 and can move axially and telescopically along the outer cylinder 11. At this time, the telescopic rod 12 can only move axially and telescopically relative to the outer cylinder 11 and cannot rotate. The telescopic rod 12 can be retracted into the outer cylinder 11 and can also be partially extended out of the outer cylinder 11. The first screw rod nut 15 is fixedly installed in the telescopic rod 12, specifically at a position close to one end of the inner end of the telescopic rod. The telescopic rod motor 13 is a forward and reverse motor. The telescopic rod motor 13 is fixedly installed in one end of the outer cylinder 11, specifically the end of the outer cylinder 11 (referring to the end away from the chuck 20) and is connected with the first screw rod 14 through a shaft coupling to drive the first screw rod 14 to rotate. The first screw rod 14 is threadedly connected with the first screw rod nut 15. When the telescopic rod motor 13 rotates, the first screw rod 14 is driven to rotate. Under the cooperation of the first screw rod nut 15, the telescopic rod 12 moves to extend or retract the outer cylinder 11. When the telescopic rod 12 extends, the length of the telescopic rod unit 10 is lengthened. When the telescopic rod 12 retracts, the length of the telescopic rod unit 10 is reduced. The telescopic rod unit 10 is telescopically realized by the telescopic rod motor 13. Compared with the received adjustment mode, the labor intensity of the workers is greatly reduced, the operation accuracy is improved, and the length of the telescopic rod unit 10 can be adjusted in real time during operation or work by the telescopic rod motor 13 driving the telescopic rod 12 to extend or retract. The problem that the traditional high-altitude wiring clamp is labor-consuming and unsafe is solved.

[0036] The telescopic rod unit 10 is further provided with a first photoelectric switch 16 for detecting the maximum stroke of the telescopic rod 12. The first photoelectric switch 16 is arranged on the outer cylinder 11 and is used to detect whether the telescopic rod 12 reaches the maximum stroke, whether the telescopic rod 12 extends to the maximum length and stop the telescopic rod motor 13 when the telescopic rod 12 extends to the maximum stroke position, so as to realize more accurate control and positioning.

[0037] In the preferred embodiment, there are multiple telescopic rod units 10, and the multiple telescopic rod units 10 are connected in sequence to form an operating rod. In the two connected telescopic rod units 10, the end of the telescopic rod 12 of one is connected to the end of the outer cylinder 11 of the other. By arranging multiple telescopic rod units 10, the overall working height can be extended to adapt to use at a higher position. In the exemplary embodiment, there are two telescopic rod units 10. Preferably, in the two connected telescopic rod units 10, the end of the telescopic rod 12 of the telescopic rod unit 10 away from the chuck 20 is connected to the end of the outer cylinder 11 of the telescopic rod unit 10 close to the chuck 20. The connection between the two connected telescopic rod units 10 is threaded or clamped. In the exemplary embodiment, the end of the telescopic rod 12 and the end of the outer cylinder 11 between the two telescopic rod units 10 are connected by threading, so as to facilitate disassembly and assembly.

[0038] The telescopic rod unit 10 is provided with a remote control or a button switch to control the start and stop of the telescopic rod motor 13. The circuit board 30 and the power supply 40 are arranged in the outer cylinder 11 to electrically connect the telescopic rod motor 13 and the first photoelectric switch 16 and provide power to the telescopic rod motor 13 and the first photoelectric switch 16. When the remote control is used, the circuit board 30 is used for signal interaction (provided with corresponding wireless sending and receiving modules), and when the button switch is used, the button switch is fixedly installed on the outer cylinder 11. The application uses a remote control, and the telescopic rod motor 13 is controlled by wireless control.

[0039] The outer cylinder 11 and the telescopic rod 12 of the telescopic rod unit 10 closest to the chuck 20 are made of epoxy resin; the outer cylinder 11 and the telescopic rod 12 of the telescopic rod unit 10 farthest from the chuck 20 are made of carbon fiber, and if there are telescopic rod units 10 in between, the materials of the outer cylinder 11 and the telescopic rod 12 can be selected according to specific conditions, such as carbon fiber. The telescopic rod unit 10 uses a carbon fiber tube, which not only ensures sufficient strength and rigidity, but also reduces the overall weight; the telescopic rod unit 10 uses an epoxy resin material, which has excellent insulation performance and can effectively prevent current from being conducted through the telescopic rod unit 10 to the operator, thereby enhancing safety and solving the problem of safety hazards caused by the installation of the wire clamp due to wind force and the insulation safety problem of electrical equipment in high-altitude work.

[0040] Please refer to Figure 1 , and Figures 3 to 5The chuck 20 comprises a chuck body 21, a fixed chuck 22, a movable chuck 23, a chuck motor 24, a second lead screw 25 and a second lead screw nut 26. The chuck body 21 is mounted at the end of the telescopic rod 12 of the telescopic rod unit 10. In the example embodiment, the chuck body 21 is fixedly mounted at the end of the telescopic rod 12 of the frontmost telescopic rod unit 10. In other embodiments, the chuck body 21 can be detachably connected to the telescopic rod 12 by screwing, clamping or quick coupling.

[0041] A sliding groove 27 is formed in one side of the chuck body 21 along the extension direction of the chuck body 21. The fixed chuck 22 is mounted in the end of the sliding groove 27 away from the telescopic rod unit 10. The movable chuck 23 is slidingly arranged in the sliding groove 27. The second lead screw nut 26 is fixedly mounted on the movable chuck 23. The chuck motor 24 is a reversible motor. The chuck motor 24 is fixedly mounted on the chuck body 21 at a position close to the telescopic rod unit 10 and is connected to the second lead screw 25 to drive the second lead screw 25 to rotate. The second lead screw 25 is threadedly connected to the second lead screw nut 26. In the implementation, when the chuck motor 24 rotates, the second lead screw 25 is driven to rotate. Under the cooperation of the second lead screw nut 26, the movable chuck 23 moves towards or away from the fixed chuck 22. When the movable chuck 23 moves towards the fixed chuck 22, the high-voltage line is clamped. When the movable chuck 23 moves away from the fixed chuck 22, the clamping is released. By adjusting the position of the movable chuck 23, the opening size of the terminal clamp can be adjusted. This method can obtain a larger terminal clamp opening to meet the use of more models of circuit breakers, such as the use in 500kV circuit breaker loop resistance testing, solving the problem that the opening size of the existing high-altitude terminal clamp does not meet the testing requirements. The existing terminal clamp for circuit breaker usually only hangs the clamp head on the high-voltage line for use without self-locking function. The terminal clamp of the present application can clamp the high-voltage line through the movable chuck 23 and the fixed chuck 22 to realize self-locking, that is, with self-locking function. The cooperation of the movable chuck 23 and the fixed chuck 22 makes the clamping more firm and less likely to fall off, which can effectively prevent the terminal clamp from falling under the action of wind. Through the above scheme, the problem that the opening size of the existing high-altitude terminal clamp does not meet the testing requirements is solved. In addition, the integrated design makes the functions of the chuck part more comprehensive and can meet various testing requirements.

[0042] The chuck body 21 is provided with a limiting groove 28 penetrating through the sliding groove 27 at the other side relative to the sliding groove 27. A limiting block is arranged on the movable chuck 23. The limiting block penetrates through the limiting groove 28. The end of the limiting block penetrating through the limiting groove 28 is fixedly provided with a limiting block 29. The limiting block 29 is larger than the limiting groove 28. Therefore, through the action of the limiting block 29, the movable chuck 23 is effectively prevented from coming out of the sliding groove 27.

[0043] The fixed clamp head 22 is connected with the clamp head body 21 through the elastic member 211, and the elastic member 211 is located on the side of the fixed clamp head 22 away from the movable clamp head 23. By arranging the elastic member 211, a buffering effect can be achieved during clamping, the impact on the wire clamp and the high-voltage wire is reduced, and the equipment is protected from damage. In the exemplary embodiment, the elastic member 211 is a spring column structure, the fixed clamp head 22 is movably arranged in the sliding groove 27, the column body of the elastic member 211 is fixedly connected with the fixed clamp head 22, the other end penetrates through the clamp head body 21, the spring sleeve of the spring column structure of the elastic member 211 is arranged on the column body and located between the fixed clamp head 22 and the groove wall of the sliding groove 27. When the movable clamp head 23 moves towards the fixed clamp head 22 and clamps the high-voltage wire, the fixed clamp head 22 and the high-voltage wire will be impacted during clamping, and of course an opposite force will be applied to the movable clamp head 23. At this time, the impact can be effectively offset by the buffering effect of the elastic member 211, and the equipment is protected from damage. By arranging the spring buffering and movable / fixed clamp head, the flexibility and stability of clamping are improved.

[0044] The fixed clamp head 22 is provided with a limiting block, the limiting block penetrates through the limiting groove 28, and the end of the limiting block penetrating through the limiting groove 28 is fixedly provided with a limiting block 29. The limiting block 29 is larger than the limiting groove 28, so that the fixed clamp head 22 is effectively prevented from being pulled out of the sliding groove 27 by the action of the limiting block 29.

[0045] In the preferred embodiment, the clamp motor 24 is connected with the second lead screw 25 through the drum gear coupling 212. When the clamp motor 24 is unexpectedly disabled, the bias compensation allowance of the drum gear coupling 212 is used to shake the clamp head 20 by force through the telescopic rod unit 10, so that the fixed clamp head 22 and the movable clamp head 23 clamping the high-voltage wire are separated by a certain distance. The distance can be used to release the clamp, so that the clamp head 20 can be conveniently removed from the high-voltage wire in the case of failure of the clamp motor 24.

[0046] The fixed clamp head 22 is made of conductive metal to have a conductive effect, and the movable clamp head 23 and the clamp head body 21 are subjected to insulation treatment, such as using epoxy resin material. The fixed clamp head 22 is provided with a wire post 215 for connecting the wire.

[0047] The clamp head body 21 is further provided with a second photoelectric switch 213 for detecting the position of the movable clamp head 23 when the movable clamp head 23 moves to the maximum opening position. When the movable clamp head 23 moves to the position of the maximum opening position, it is detected by the second photoelectric switch 213. At this time, feedback is given to the clamp motor 24, and the clamp motor 24 stops.

[0048] According to the diameter of the high-voltage line, the motor 24 of the movable clamp head 23 is controlled to operate for a certain time to drive the movable clamp head 23 to move a certain distance to the fixed clamp head 22, so that the accurate clamping can be realized.

[0049] In the exemplary embodiment, the clamp head 20 is configured with a remote controller to control the start and stop of the clamp head motor 24, and the circuit board 30 and power supply 40 are arranged in the clamp head body 21 to electrically connect the clamp head motor 24 and the second photoelectric switch 213 and provide power for the clamp head motor 24 and the second photoelectric switch 213. The control form of the remote controller interacts with the circuit board 30 (configured with corresponding wireless sending and receiving modules). In the embodiment of the application, by integrating an intelligent control algorithm on the circuit board 30, the length of the telescopic rod composed of the telescopic rod unit 10 and the clamping force of the clamp head 20 can be automatically adjusted according to actual needs, intelligent control is realized, at the same time, the opening size of the clamp head can be adjusted according to the diameter and shape of the high-voltage line, the accuracy and stability of clamping are ensured, the automation degree and intelligent level of the wire clamp in high-altitude operation are improved, the possibility of manual intervention and misoperation is reduced, and the work efficiency and safety are improved.

[0050] In the preferred embodiment, the fixed clamp head 22 and the movable clamp head 23 are provided with anti-slip patterns on the opposite sides to further enhance the clamping effect.

[0051] The following is a schematic implementation of the exemplary embodiment: the telescopic rod motor 13 is started by the remote controller, the telescopic rod motor 13 drives the first screw rod 14 to rotate, the telescopic rod unit 10 is telescoped to the required length, the motor stops working, and the length is accurately adjusted; after the telescopic rod formed by the plurality of telescopic rod units 10 is adjusted to the appropriate position, the clamp head motor 24 is started, the clamp head motor 24 drives the second screw rod 25 to rotate through the drum gear coupling 212, the second screw rod 25 drives the movable clamp head 23 to move towards the fixed clamp head 22, until the high-voltage line is clamped, the elastic member 211 buffers during the clamping process, reducing the impact; after the clamp head 20 is clamped, the test lead is connected to the electrical test equipment through the terminal post 215 to test the loop resistance, after the test is completed, the clamp head motor 24 is operated in reverse to release the clamp head, the telescopic rod is retracted, and the entire operation process is completed.

[0052] The above is only a specific embodiment of the application, but the protection scope of the application is not limited thereto, any changes or replacements within the technical range disclosed by the application can be easily thought of by those skilled in the art, which should be covered within the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A disconnecting clamp with self-locking function, comprising a telescopic rod unit (10) and a chuck (20) arranged on the telescopic rod unit (10), characterized in that: the telescopic rod unit (10) is multiple, and the multiple telescopic rod units (10) are connected in sequence; the telescopic rod unit (10) comprises an outer cylinder (11), a telescopic rod (12), a telescopic rod motor (13), a first lead screw (14) and a first lead screw nut (15), the telescopic rod (12) is sleeved in the outer cylinder (11) and can axially extend and retract along the outer cylinder (11), the first lead screw nut (15) is fixedly installed in the telescopic rod (12), the telescopic rod motor (13) is fixedly installed in one end of the outer cylinder (11) and connected with the first lead screw (14) to drive the first lead screw (14) to rotate, and the first lead screw (14) is in threaded connection with the first lead screw nut (15); the chuck (20) comprises a chuck body (21), a fixed chuck (22), a movable chuck (23), a chuck motor (24), a second lead screw (25) and a second lead screw nut (26), the fixed chuck (22) is installed at the end of the telescopic rod (12) of the telescopic rod unit (10), one side surface of the chuck body (21) is provided with a sliding groove (27) along the extending direction thereof, the chuck body (21) is installed in one end of the sliding groove (27) away from the telescopic rod unit (10), the movable chuck (23) is slidably arranged in the sliding groove (27), the second lead screw nut (26) is fixedly installed on the movable chuck (23), the chuck motor (24) is fixedly installed on the chuck body (21) and connected with the second lead screw (25) to drive the second lead screw (25) to rotate, and the second lead screw (25) is in threaded connection with the second lead screw nut (26).

2. The disconnecting clamp with self-locking function according to claim 1, characterized in that: a first photoelectric switch (16) for detecting the maximum stroke of the telescopic rod (12) is further arranged on the telescopic rod unit (10).

3. The disconnecting clamp with self-locking function according to claim 1, characterized in that: the end of the telescopic rod (12) of one of the two connected telescopic rod units (10) is connected with the end of the outer cylinder (11) of the other telescopic rod unit (10).

4. The disconnecting clamp with self-locking function according to claim 1, characterized in that: the outer cylinder (11) and the telescopic rod (12) of the telescopic rod unit (10) closest to the chuck (20) are made of epoxy resin, and the outer cylinder (11) and the telescopic rod (12) of the telescopic rod unit (10) farthest from the chuck (20) are made of carbon fiber.

5. The disconnecting clamp with self-locking function according to claim 1, characterized in that: the connection mode of the two connected telescopic rod units (10) is threaded connection or clamping.

6. The disconnecting wrench with self-locking function according to claim 1, characterized in that: The clamping head body (21) is provided with a limiting slot (28) penetrating the sliding slot (27) on the other side relative to the sliding slot (27), the movable clamping head (23) is provided with a limiting block penetrating the limiting slot (28), and the end of the limiting block penetrating the limiting slot (28) is fixedly provided with a limiting block (29).

7. The disconnecting wrench with self-locking function according to claim 6, characterized in that: The fixed clamping head (22) is connected with the clamping head body (21) through an elastic element (211), and the elastic element (211) is located on the side of the fixed clamping head (22) away from the movable clamping head (23).

8. The disconnecting wrench with self-locking function according to claim 7, characterized in that: The fixed clamping head (22) is provided with a limiting block penetrating the limiting slot (28), and the end of the limiting block penetrating the limiting slot (28) is fixedly provided with a limiting block (29).

9. The disconnecting wrench with self-locking function according to claim 1, characterized in that: The clamping head body (21) is further provided with a second photoelectric switch (213) for detecting the position of the movable clamping head (23) when the movable clamping head (23) moves to the maximum opening.

10. The disconnecting wrench with self-locking function according to claim 1, characterized in that: The fixed clamping head (22) and the movable clamping head (23) are provided with anti-skid lines on the opposite sides.

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