Main contact and arc contact driving device and switch equipment

Abstract

The invention discloses a main and arc contact driving device and switch equipment, and relates to the technical field of high-voltage switches, the main and arc contact driving device comprises a main shaft, a main contact crank arm and an arc contact crank arm, the main shaft is provided with a guide block, the outer wall of the guide block is provided with a guide groove, and the guide groove comprises a switching-on section, a transition section and a switching-off section which are sequentially arranged along the circumferential direction of the main shaft and are communicated. The opening section and the closing section are arranged in a staggered manner along the axial direction of the main shaft; the main contact crank arm is arranged on the main shaft and is used for driving the movable main contact and the static main contact to be switched on or switched off; the first end of the arc contact crank arm is provided with a crank arm pin, the crank arm pin is movably arranged in the guide groove, the second end of the arc contact crank arm is connected with the moving arc contact, when the crank arm pin moves in the closing section, the moving arc contact and the static arc contact are closed, and when the crank arm pin moves in the opening section, the moving arc contact and the static arc contact are opened. According to the invention, the movable main contact and the movable arc contact can be respectively driven, and the characteristic requirement of asynchronous movement between the main contact and the arc contact is met.

Description

Technical Field

[0001] The present application relates to the technical field of high-voltage switches, and more specifically, to a main contact and arc contact driving device and a switch device. Background Art

[0002] High-voltage vacuum circuit breakers in switchgear typically use vacuum interrupters to achieve current flow and interruption, which is suitable for circuit breakers with lower rated currents. However, for high-voltage vacuum circuit breakers that need to meet high current flow requirements, such as generator circuit breakers, due to the difficulty in heat dissipation in a vacuum environment, it is difficult to simultaneously meet the short-circuit current interruption and high current flow requirements by relying solely on vacuum interrupters. Therefore, an effective solution is to connect a main contact specifically for conducting electricity in parallel with the vacuum interrupter, allowing the vacuum interrupter to only take on the task of breaking current. Under this design, during the opening operation, the main contact needs to operate to open first, and then the vacuum interrupter starts to operate to open, to ensure that the generated arc appears only in the vacuum interrupter, thereby ensuring that the arc can be reliably extinguished.

[0003] Therefore, how to meet the asynchronous movement requirements of the main contacts and the arcing contacts has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0004] The purpose of this application is to provide a main and arc contact driving device to meet the asynchronous movement requirements of the main contacts and the arc contacts.

[0005] Another object of the present application is to provide a switchgear comprising the above-mentioned main and arcing contact driving device.

[0006] A main and arcing contact driving device, comprising:

[0007] A main shaft, wherein the main shaft is provided with a guide block, and a guide groove is provided on the outer wall of the guide block, wherein the guide groove includes a closing section, a transition section, and an opening section, wherein the closing section, the transition section, and the opening section are sequentially arranged and connected along the circumference of the main shaft, and along the axial direction of the main shaft, the opening section and the closing section are staggered.

[0008] The main contact arm is provided on the main shaft and is used to connect with the moving main contact to drive the moving main contact and the static main contact to open or close;

[0009] An arc contact crank arm, wherein a crank arm pin is provided at a first end of the arc contact crank arm, the crank arm pin is movably provided in the guide groove, and a second end of the arc contact crank arm is used to connect with the moving arc contact;

[0010] Wherein, when the toggle pin moves within the closing section, the moving arcing contact and the static arcing contact are in the closed state, and when the toggle pin moves within the opening section, the moving arcing contact and the static arcing contact are in the open state.

[0011] Optionally, in the above main and arcing contact driving device, along the axial direction of the main shaft, each part of the closing section is arranged at the same position;

[0012] When the toggle pin moves within the closing section, the position of the arcing contact toggle arm remains unchanged.

[0013] Optionally, in the above main and arcing contact driving device, along the axial direction of the main shaft, each part of the opening section is arranged at the same position;

[0014] When the toggle pin moves within the opening section, the position of the arcing contact toggle arm remains unchanged.

[0015] Optionally, in the above main and arcing contact driving device, it further includes two baffles, the two baffles are parallel to each other and arranged at intervals, and a sliding groove is formed between the two baffles, the sliding groove penetrates along the axial direction of the main shaft, the arcing contact toggle arm is movably arranged in the sliding groove, and the first end and the second end of the arcing contact toggle arm are both exposed outside the sliding groove.

[0016] Optionally, in the above main and arcing contact driving device, a roller is arranged at the first end of the toggle pin, and the roller is rotatably arranged in the guiding groove.

[0017] Optionally, in the above main and arcing contact driving device, a convex edge is arranged at the opening of the guiding groove, and the convex edge is used to limit the roller in the guiding groove.

[0018] Optionally, in the above main and arcing contact driving device, an installation hole is formed on the arcing contact toggle arm, a first mating surface is arranged on the inner wall of the installation hole, the second end of the toggle pin is embedded in the installation hole, and a second mating surface arranged opposite to the first mating surface is provided.

[0019] Optionally, in the above main and arcing contact driving device, the arcing contact toggle arm and the toggle pin are connected by welding.

[0020] Optionally, in the above main and arcing contact driving device, the main shaft and the guiding block are of an integral structure or a split structure.

[0021] A switchgear includes the above main and arcing contact driving device.

[0022] The main and arcing contact driving device provided by this application includes a main shaft, a main contact rocker arm, and an arcing contact rocker arm. The main shaft is used to be driven to rotate by a driving member such as a motor. A guiding block is provided on the main shaft, and a guiding groove is provided on the outer wall of the guiding block. The guiding groove includes a closing section, a transition section, and a tripping section. The closing section, the transition section, and the tripping section are arranged in sequence and communicated along the circumferential direction of the main shaft, and along the axial direction of the main shaft, the tripping section and the closing section are arranged in a staggered manner; the main contact rocker arm is arranged on the main shaft and is used to connect with the moving main contact to drive the moving main contact to trip and close with the static main contact; a rocker arm pin is provided at the first end of the arcing contact rocker arm, and the rocker arm pin is movably arranged in the guiding groove, and the second end of the arcing contact rocker arm is used to connect with the moving arcing contact. Among them, when the rocker arm pin moves in the closing section, the moving arcing contact and the static arcing contact are in the closing state. When the rocker arm pin moves in the tripping section, the moving arcing contact and the static arcing contact are in the tripping state. That is, the closing state of the arcing contact corresponds to the movement of the rocker arm pin in the closing section; the tripping state of the arcing contact corresponds to the movement of the rocker arm pin in the tripping section; the state switching of the arcing contact between the closing state and the tripping state corresponds to the movement of the rocker arm pin in the transition section.

[0023] During the tripping process, the main shaft is driven to rotate forward, so as to drive the main contact rocker arm to rotate. The rotation of the main contact rocker arm can drive the moving main contact to move in the direction of separating from the static main contact; at the same time, during the initial rotation process of the main shaft, the rocker arm pin first moves in the closing section. At this time, the position of the rocker arm pin remains unchanged along the axial direction of the main shaft, so that the positions of the arcing contact rocker arm and the moving arcing contact remain fixed. Until the moving main contact is driven to separate from the static main contact, the rocker arm pin moves into the tripping section via the transition section. At this time, the rocker arm pin can drive the arcing contact rocker arm to generate an axial movement relative to the main shaft along the transition section, so as to drive the moving arcing contact to move away from the static arcing contact. When the rocker arm pin moves in the tripping section, the moving arcing contact and the static arcing contact are separated to achieve tripping; during the closing process, the main shaft is driven to rotate reversely, and the rocker arm pin moves from the tripping section into the closing section via the transition section. When the rocker arm pin moves in the transition section, the arcing contact rocker arm drives the moving arcing contact to move in the direction of the static arcing contact. Until the rocker arm pin moves into the closing section, the moving arcing contact and the static arcing contact contact and close. At the same time, during the reverse rotation process of the main shaft, the main contact rocker arm is driven by the main shaft to rotate synchronously and drives the moving main contact to move in the direction of the static main contact. When the rocker arm pin moves to the transition section c, the moving arcing contact is driven to start moving in the direction of the static arcing contact. When the rocker arm pin moves to the closing section, the arcing contact closes. At this time, the moving main contact is still driven by the main contact rocker arm to continue moving in the direction of the static main contact until the main contact closes in place, realizing the mechanical characteristics of the asynchronous cooperative movement of the main contact and the arcing contact.

[0024] Compared with the related art, the main and arcing contact driving devices provided by the present application can separately drive the moving main contact and the moving arcing contact, meet the characteristic requirements of asynchronous movement between the main contact and the arcing contact, and have a simple structure, few components, low production cost, low failure rate, and convenient maintenance.

[0025] The switchgear provided by the present application includes the above-mentioned main and arcing contact driving devices, so it also has the above-mentioned structure and beneficial effects. For other structures, reference can be made to the related art and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the following will briefly introduce the drawings required for the description of the embodiments or the related art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 Structural schematic of the main and arcing contact driving device disclosed in the embodiment of the present application Figure 1 ;

[0028] Figure 2 Structural schematic of the main and arcing contact driving device disclosed in the embodiment of the present application Figure 2 ;

[0029] Figure 3 Expanded schematic diagram of the guiding groove disclosed in the embodiment of the present application;

[0030] Figure 4 Assembly schematic diagram of the arcing contact crank and the main shaft in the main and arcing contact driving device disclosed in the embodiment of the present application;

[0031] Figure 5 Assembly schematic diagram of the first type of arcing contact crank and the baffle in the main and arcing contact driving device disclosed in the embodiment of the present application Figure 1 ;

[0032] Figure 6 Assembly schematic diagram of the first type of arcing contact crank and the baffle in the main and arcing contact driving device disclosed in the embodiment of the present application Figure 2 ;

[0033] Figure 7 Assembly schematic diagram of the second type of arcing contact crank and the baffle in the main and arcing contact driving device disclosed in the embodiment of the present application Figure 1 ;

[0034] Figure 8 Assembly schematic diagram of the second type of arcing contact crank and the baffle in the main and arcing contact driving device disclosed in the embodiment of the present application Figure 2 [[ID=5

[0035] Among them, 100 is the main shaft, 110 is the guiding block, 111 is the guiding groove, 111a is the closing section, 111b is the opening section, 111c is the transition section, and 112 is the convex edge;

[0036] 200 is the main contact crank arm;

[0037] 300 is the arcing contact crank arm, 301 is the mounting hole, 310 is the crank arm pin, 320 is the roller, and 330 is the baffle;

[0038] 400 is the first transmission mechanism;

[0039] 500 is the second transmission mechanism;

[0040] 600 is the moving main contact;

[0041] 700 is the moving arcing contact. Specific embodiments

[0042] The core of this application lies in disclosing a main and arcing contact driving device to meet the asynchronous movement requirements of the main contact and the arcing contact.

[0043] Another core of this application lies in disclosing a switchgear including the above-mentioned main and arcing contact driving device.

[0044] Hereinafter, the embodiments will be described with reference to the drawings. In addition, the embodiments shown below do not impose any limitation on the inventive content recited in the claims. Further, all the contents of the configurations shown in the following embodiments are not limited to those necessary for the solution of the invention recited in the claims. It should be noted that for the sake of description, only the parts related to the relevant invention are shown in the drawings. Without conflict, the embodiments in this application and the features in the embodiments can be combined with each other.

[0045] In switching equipment such as high-voltage vacuum circuit breakers, the main contacts and arcing contacts are two key types of contacts that work together to control current and protect the circuit. The main contacts are the core components of the main circuit of a high-voltage vacuum circuit breaker and are used to carry normal load current. They include a moving main contact and a static main contact. When the two are closed, the load current passes through them for a long time to ensure smooth current flow; when they are opened, the current is cut off. The arcing contacts are specifically used to break short-circuit current and extinguish the arc. They include a moving arcing contact and a static arcing contact. The conduction and interruption of the moving arcing contact and the static arcing contact respectively achieve the closing and opening of the arcing contacts. During the operation of a high-voltage vacuum circuit breaker, when closing, the arcing contacts close before the main contacts to take on the current first and prepare for arc extinguishing; when opening, the main contacts open before the arcing contacts, transferring the current to the arcing contacts. The arcing contacts finally open and quickly extinguish the arc using their design structure to prevent the arc from damaging the equipment. This design of the closing and opening sequence not only ensures the carrying of normal current but also effectively protects the safety of the high-voltage vacuum circuit breaker under short-circuit conditions. Based on this, the present application discloses the following main and arcing contact driving device and switching equipment.

[0046] Combined with Figures 1 - 8 , the main and arcing contact driving device disclosed in the embodiment of the present application includes a main shaft 100, a main contact crank arm 200, and an arcing contact crank arm 300. The main shaft 100 is used to be driven to rotate by a driving member such as a motor. A guiding block 110 is provided on the main shaft 100. A guiding groove 111 is provided on the outer wall of the guiding block 110. The guiding groove 111 includes a closing section 111a, a transition section 111c, and an opening section 111b. The closing section 111a, the transition section 111c, and the opening section 111b are arranged in sequence and communicated along the circumferential direction of the main shaft 100, and along the axial direction of the main shaft 100, the opening section 111b and the closing section 111a are arranged in a staggered manner; the main contact crank arm 200 is provided on the main shaft 100 and is used to be connected to the moving main contact 600 to drive the moving main contact 600 to close or open with the static main contact; a crank arm pin 310 is provided at the first end of the arcing contact crank arm 300. The crank arm pin 310 is movably arranged in the guiding groove 111. The second end of the arcing contact crank arm 300 is used to be connected to the moving arcing contact 700. Among them, when the crank arm pin 310 moves in the closing section 111a, the moving arcing contact 700 and the static arcing contact are in the closing state. When the crank arm pin 310 moves in the opening section 111b, the moving arcing contact 700 and the static arcing contact are in the opening state. That is, the closing state of the arcing contact corresponds to the movement of the crank arm pin 310 in the closing section 111a; the opening state of the arcing contact corresponds to the movement of the crank arm pin 310 in the opening section 111b; the state transition of the arcing contact between the closing state and the opening state corresponds to the movement of the crank arm pin 310 in the transition section 111c.

[0047] Specifically, combined with Figure 3, along the axial direction of the main shaft 100, each part of the closing section 111a can be set at the same position, with a simple structure and convenient production, and when the toggle pin 310 moves within the closing section 111a, the position of the arcing contact toggle 300 can be kept unchanged to ensure reliable closing of the moving arcing contact 700 and the static arcing contact. Similarly, along the axial direction of the main shaft 100, each part of the opening section 111b can be set at the same position, which is convenient for production, and when the toggle pin 310 moves within the opening section 111b, the position of the arcing contact toggle 300 can be kept unchanged to achieve reliable opening of the moving arcing contact 700 and the static arcing contact. The connecting parts of the closing section 111a and the opening section 111b with the transition section 111c can be set as arc structures to facilitate the smooth movement of the toggle pin 310 between the closing section 111a and the transition section 111c, and between the opening section 111b and the transition section 111c.

[0048] Combined with Figure 1 , Figure 2 and Figure 3, during the opening process, the main shaft 100 is driven to rotate forward, so as to drive the main contact crank arm 200 to rotate. The rotation of the main contact crank arm 200 can drive the moving main contact 600 to move in the direction of separating from the static main contact. At the same time, during the initial rotation of the main shaft 100, the crank arm pin 310 first moves within the closing section 111a. At this time, the position of the crank arm pin 310 remains unchanged in the axial direction of the main shaft 100, so that the arcing contact crank arm 300 and the moving arcing contact 700 maintain fixed positions. Until the moving main contact 600 is driven to separate from the static main contact, the crank arm pin 310 moves into the opening section 111b via the transition section 111c. At this time, the crank arm pin 310 can drive the arcing contact crank arm 300 to generate axial movement relative to the main shaft 100 along the transition section 111c, so as to drive the moving arcing contact 700 to move away from the static arcing contact. When the crank arm pin 310 moves within the opening section 111b, the moving arcing contact 700 and the static arcing contact are opened. During the closing process, the main shaft 100 is driven to rotate reversely, and the crank arm pin 310 moves from the opening section 111b into the closing section 111a via the transition section 111c. When the crank arm pin 310 moves within the transition section 111c, the arcing contact crank arm 300 drives the moving arcing contact 700 to move in the direction of the static arcing contact. Until the crank arm pin 310 moves into the closing section 111a, the moving arcing contact 700 contacts and closes with the static arcing contact. At the same time, during the reverse rotation of the main shaft 100, the main contact crank arm 200 is driven by the main shaft 100 to rotate synchronously, and drives the moving main contact 600 to move in the direction of the static main contact. When the crank arm pin 310 moves to the transition section 111c, the moving arcing contact 700 is driven to start moving in the direction of the static arcing contact. When the crank arm pin 310 moves to the closing section, the arcing contact closes. At this time, the moving main contact 600 is still driven by the main contact crank arm 200 to continue moving in the direction of the static main contact until the main contact closes in place, realizing the mechanical characteristics of the asynchronous cooperative movement of the main contact and the arcing contact.

[0049] Among them, the parameters of each part structure of the guide groove 111 can be specifically designed according to the requirements of the closing and opening mechanical characteristics matching of the main contact and the arcing contact. Exemplarily, according to different requirements of movement speed and stroke, the shape, slope and groove length of the guide groove 111 at the transition section 111c can be designed.

[0050] Compared with the related art, the main and arcing contact driving device disclosed in the embodiment of the present application can realize the separate driving of the moving main contact 600 and the moving arcing contact 700, meet the characteristic requirements of the asynchronous movement between the main contact and the arcing contact, and has the advantages of simple structure, few parts, low production cost, low failure rate and convenient maintenance.

[0051] Define that the moving main contact 600 moves between a first position and a second position. When the moving main contact 600 is in the first position, the moving main contact 600 is electrically connected to the static main contact to realize the closing of the main contact; when the moving main contact 600 is in the second position, the moving main contact 600 has no contact with the static main contact to realize the opening of the main contact. In some embodiments, the main contact crank arm 200 is drivingly connected to the moving main contact 600 through a first transmission mechanism 400 to drive the moving main contact 600 to linearly move between the first position and the second position, and the structure is simple and reliable. The embodiment of the present application does not limit the specific structure of the first transmission mechanism 400. Exemplarily, the first transmission mechanism 400 can be a four-bar linkage mechanism.

[0052] Define that the moving arcing contact 700 moves between a third position and a fourth position. When the moving arcing contact 700 is in the third position, the moving arcing contact 700 is electrically connected to the static arcing contact to realize the closing of the arcing contact; when the moving arcing contact 700 is in the fourth position, the moving arcing contact 700 has no contact with the static arcing contact to realize the opening of the arcing contact. In some embodiments, the arcing contact crank arm 300 can be drivingly connected to the moving arcing contact 700 through a second transmission mechanism 500 to drive the moving arcing contact 700 to linearly move between the third position and the fourth position. Exemplarily, the second transmission mechanism 500 can be a pull rod, and the specific structure of the pull rod and its connection manner with the moving arcing contact 700 are all prior arts and will not be elaborated herein.

[0053] In order to improve the reliability of the arcing contact crank arm 300 moving along the axial direction of the main shaft 100 with the crank pin 310, the main and arcing contact driving device further includes two baffles 330. The two baffles 330 are parallel to each other and arranged at intervals, and a sliding groove is formed between the two baffles 330. The sliding groove penetrates along the axial direction of the main shaft 100. The arcing contact crank arm 300 is movably inserted into the sliding groove, and both the first end and the second end of the arcing contact crank arm 300 are exposed outside the sliding groove to assist in restricting the movement direction of the arcing contact crank arm 300 through the two baffles 330, and at the same time avoid affecting the connection between the arcing contact crank arm 300 and the crank pin 310 and the moving arcing contact 700. Specifically, in combination with Figures 5 - 8 , the arcing contact crank arm 300 is of a plate-like structure, and the baffles 330 can be respectively arranged opposite to the two plate surfaces of the arcing contact crank arm 300, or arranged opposite to the side wall of the arcing contact crank arm 300, as long as the movement of the arcing contact crank arm 300 is not affected.

[0054] In combination with Figure 4 , in order to facilitate the sliding of the crank pin 310 in the guiding groove 111, a roller 320 is provided at the first end of the crank pin 310. The roller 320 is rotatably arranged in the guiding groove 111. During the rotation of the main shaft 100, the roller 320 rolls in the guiding groove 111. By providing the roller 320, the friction between the crank pin 310 and the guiding groove 111 can be reduced.

[0055] Further, in combination with Figure 4 , a convex edge 112 is provided at the opening of the guiding groove 111. The convex edge 112 is used to limit the roller 320 within the guiding groove 111 to ensure reliable rolling of the roller 320 within the guiding groove 111.

[0056] In some embodiments, in combination with Figure 5 , mounting holes 301 are formed in the arcing contact crank arm 300. A first mating surface is provided on the inner wall of the mounting hole 301. The second end of the crank arm pin 310 is embedded in the mounting hole 301 and is provided with a second mating surface arranged opposite to the first mating surface, thereby realizing the fixed connection between the arcing contact crank arm 300 and the crank arm pin 310. Exemplarily, the mounting hole 301 can be a hexagonal hole, and the side walls of each plane of the hexagonal hole serve as the first mating surface. Correspondingly, the second end of the crank arm pin 310 can be provided with a hexagonal prism structure, and the side walls of each plane of the hexagonal prism structure serve as the second mating surface. The arcing contact crank arm 300 and the crank arm pin 310 can also be connected by welding, screwing, etc. The embodiments of the present application do not limit this.

[0057] The main shaft 100 and the guiding block 110 are usually coaxially arranged. The main shaft 100 and the guiding block 110 can be an integral structure or a split structure. When it is a split structure, the guiding block 110 can be directly press-fitted onto the main shaft 100 to achieve clamping connection, and can also be assembled with the main shaft 100 by means of key connection, pin connection, threaded connection, etc. The structure is simple and convenient for production. The embodiments of the present application do not limit this, as long as it is ensured that the guiding block 110 can rotate together with the main shaft 100.

[0058] The main contact and the arcing contact usually also have different moving speeds during opening and closing. This can be achieved by setting the parameters of the guiding groove 111, and can also be achieved by setting the extension lengths of the main contact crank arm 200 and the arcing contact crank arm 300. Therefore, the extension lengths of the main contact crank arm 200 and the arcing contact crank arm 300 can be the same or different.

[0059] The switchgear disclosed in the embodiments of the present application includes the above-mentioned main and arcing contact driving devices, so it also has the above-mentioned structure and beneficial effects. Other structures refer to the related art and will not be elaborated here.

[0060] The terms "first", "second", etc. in the description and claims of this application are used to distinguish different objects, rather than to describe a specific order, and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second" may explicitly or implicitly include one or more of such features. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may include steps or units not listed. Additionally, in the description of the embodiments of this application, "a plurality of" means two or more than two.

[0061] The above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this application. Specific technical means in some embodiments can be partially or wholly incorporated into another embodiment on the premise that they are not explicitly excluded by another embodiment. Therefore, this application will not be limited to these embodiments shown herein, but rather will conform to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A main and arc contact driving device, characterized in that, Comprising: A main shaft (100) is provided with a guiding block (110) thereon. A guiding groove (111) is provided on the outer wall of the guiding block (110). The guiding groove (111) includes a closing section (111a), a transition section (111c), and a tripping section (111b). The closing section (111a), the transition section (111c), and the tripping section (111b) are arranged in sequence and communicated along the circumferential direction of the main shaft (100), and along the axial direction of the main shaft (100), the tripping section (111b) and the closing section (111a) are arranged in a staggered manner. A main contact crank arm (200) is arranged on the main shaft (100) and is used for connecting with a moving main contact (600) to drive the moving main contact (600) to close or trip with a static main contact. An arcing contact crank arm (300), a crank arm pin (310) is provided at the first end of the arcing contact crank arm (300). The crank arm pin (310) is movably arranged in the guiding groove (111), and the second end of the arcing contact crank arm (300) is used for connecting with a moving arcing contact (700). Wherein, when the crank arm pin (310) moves in the closing section (111a), the moving arcing contact (700) and the static arcing contact are in a closed state. When the crank arm pin (310) moves in the tripping section (111b), the moving arcing contact (700) and the static arcing contact are in a tripped state.

2. The main and arc contact driving device according to claim 1, characterized in that, Along the axial direction of the main shaft (100), each part of the closing section (111a) is arranged at the same position. When the crank arm pin (310) moves in the closing section (111a), the position of the arcing contact crank arm (300) remains unchanged.

3. The main and arc contact driving device according to claim 1, characterized in that, Along the axial direction of the main shaft (100), each part of the tripping section (111b) is arranged at the same position. When the crank arm pin (310) moves in the tripping section (111b), the position of the arcing contact crank arm (300) remains unchanged.

4. The main and arc contact driving device according to claim 1, characterized in that, It further includes two baffles (330). The two baffles (330) are parallel to each other and arranged at intervals, and a sliding groove is formed between the two baffles (330). The sliding groove penetrates along the axial direction of the main shaft (100). The arcing contact crank arm (300) is movably inserted into the sliding groove, and both the first end and the second end of the arcing contact crank arm (300) are exposed outside the sliding groove.

5. The main and arc contact driving device according to claim 1, characterized in that, A roller (320) is provided at the first end of the crank arm pin (310). The roller (320) is rotatably arranged in the guiding groove (111).

6. The main and arc contact driving device according to claim 5, characterized in that, A convex edge (112) is provided at the opening of the guiding groove (111). The convex edge (112) is used for limiting the roller (320) in the guiding groove (111).

7. The main and arc contact driving device according to claim 1, characterized in that, An installation hole (301) is formed on the arcing contact crank arm (300). A first mating surface is provided on the inner wall of the installation hole (301). The second end of the crank arm pin (310) is embedded in the installation hole (301) and is provided with a second mating surface arranged opposite to the first mating surface.

8. The main and arc contact driving device according to claim 1, characterized in that, The arc contact crank arm (300) is welded to the crank arm pin (310).

9. The main and arc contact driving device according to claim 1, characterized in that, The main shaft (100) and the guide block (110) are of an integral structure or a split structure.

10. A switching device, characterized in that, It includes the main and arc contact driving devices according to any one of claims 1-9.

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