A connection structure and disassembly method for the main tie rod and spring mechanism of an arc-extinguishing chamber.

Abstract

A connection structure and disassembly method for the main tie rod of the arc-extinguishing chamber and the spring mechanism, belonging to the field of vacuum circuit breakers, is disclosed. The technical solution is as follows: A connection structure for the main tie rod of the arc-extinguishing chamber and the spring mechanism includes a mechanism crank arm and an arc-extinguishing chamber main tie rod. The mechanism crank arm is hinged to the arc-extinguishing chamber main tie rod through a first connecting plate, a second connecting plate, and a connecting pin. A first connecting hole is provided at one end of the first connecting plate connected to the mechanism crank arm, and a second connecting hole is provided at the other end of the first connecting plate connected to the arc-extinguishing chamber main tie rod. The first connecting hole is an oblong hole, and the second connecting hole is a circular hole. The distance between the centers of the two end circles of the first connecting hole is the same as the dimensional deviation of the arc-extinguishing chamber main tie rod from its free state to its closed position. By utilizing the oblong hole of the first connecting hole, the dimensional deviation of the arc-extinguishing chamber main tie rod from its free state to its closed position is absorbed. The entire connection process does not require maintaining the non-opening and non-closing positions of the mechanism body, thus improving assembly efficiency.

Description

Technical Field

[0001] This invention relates to the field of vacuum circuit breaker technology, and in particular to a connection structure and disassembly method for the main tie rod and spring mechanism of the arc-extinguishing chamber. Background Technology

[0002] Environmentally friendly combined electrical appliances refer to electrical equipment combinations that fully consider environmental protection factors during design, manufacturing, and use, featuring low pollution, low energy consumption, and resource recyclability. They employ new insulating media, such as "carbon dioxide gas insulation + vacuum arc extinguishing," which produces no toxic or harmful decomposition products during operation, has good environmental adaptability, and almost zero carbon emissions. Others use dry air, a mixture of SF6 and N2 gases, etc., as insulating media, ensuring insulation performance while reducing environmental impact.

[0003] As a key unit of environmentally friendly combined electrical appliances, the vacuum interrupter structure requires its moving contacts to maintain a relatively high contact pressure during operation. This pressure is transmitted to the moving contacts of the interrupter via a spring mechanism and a transmission link. Currently, after the vacuum interrupter is assembled, the transmission link is in a free state (higher than the closed position), and the spring mechanism is normally in an open or closed state. When matching with the interrupter, the spring mechanism needs to be slowly opened and closed until the mechanism's crank arm is aligned with the main tie rod of the interrupter before the crank arm is pin-connected to the main tie rod.

[0004] In the connection between the spring mechanism and the main tie rod of the arc-extinguishing chamber, if the position of the main tie rod of the arc-extinguishing chamber exceeds the required position during the slow opening operation of the spring mechanism, the spring mechanism needs to be restored. After the mechanism is opened and closed, the slow opening operation needs to be repeated, which is extremely inefficient and has the problem of difficulty in resetting the mechanism. It is very easy to cause unnecessary characteristic problems or abnormalities, and it also has varying degrees of impact on the service life of the mechanism. Summary of the Invention

[0005] To address the technical problems of complex and inefficient operation in the existing connection process between the spring mechanism and the main tie rod of the arc-extinguishing chamber, as described in the background section, this invention provides a connection structure between the main tie rod of the arc-extinguishing chamber and the spring mechanism.

[0006] The technical solution of this invention is as follows: This invention provides a connection structure between the main tie rod of the arc-extinguishing chamber and a spring mechanism, including a mechanism crank arm and the main tie rod of the arc-extinguishing chamber. The mechanism crank arm is hinged to the main tie rod of the arc-extinguishing chamber via a first connecting plate, a second connecting plate, and a connecting pin. The first connecting plate is used for the initial connection between the mechanism crank arm in the closed state and the main tie rod of the arc-extinguishing chamber in the free state. The second connecting plate is used for locking the relative position between the mechanism crank arm and the main tie rod of the arc-extinguishing chamber in the open state. A first connecting hole is provided at the end of the first connecting plate connected to the mechanism crank arm, and a second connecting hole is provided at the end of the first connecting plate connected to the main tie rod of the arc-extinguishing chamber. The first connecting hole is... The first connecting hole is an elongated oval hole, and the second connecting hole is a circular hole. The distance between the centers of the two end circles of the first connecting hole is the same as the dimensional deviation between the free state and the closed position of the main connecting rod of the arc-extinguishing chamber. The elongated oval hole structure of the first connecting hole absorbs the dimensional deviation between the free state and the closed position of the main connecting rod of the arc-extinguishing chamber, ensuring the connection accuracy. The entire connection process does not require maintaining the non-opening and non-closing positions of the main body of the mechanism. Only the opening and closing positions of the spring mechanism need to be adjusted. This eliminates the need for multiple adjustments to the connection between the mechanism crank arm and the main connecting rod of the arc-extinguishing chamber, improving assembly efficiency.

[0007] Preferably, each end of the second connecting plate is provided with a third connecting hole. The third connecting hole is a round hole, which facilitates the use of connecting pins for stable connection. This ensures that in the open state, the mechanism crank arm and the main tie rod of the arc extinguishing chamber can be accurately and securely locked through the second connecting plate, preventing the equipment performance from being affected by relative position changes during operation.

[0008] Preferably, the third connecting hole is concentric with the end center of the corresponding second connecting plate, which improves the accuracy and symmetry of the connection, making the force transmission more uniform during installation and use, reducing component wear or connection loosening caused by eccentric force, and improving the reliability and service life of the connection structure.

[0009] Preferably, the second connecting plate is located outside the first connecting plate, and the third connecting hole on the second connecting plate for connecting with the main tie rod of the arc-extinguishing chamber is coaxially arranged with the second connecting hole; the third connecting hole on the second connecting plate for connecting with the mechanism crank arm is coaxially arranged with the end circle on the first connecting hole for connecting with the mechanism crank arm. This greatly reduces the difficulty of operation during installation, and the installer can quickly complete the connection without performing complicated hole alignment operations. At the same time, during equipment operation, it ensures a smoother force transmission path between the mechanism crank arm and the main tie rod of the arc-extinguishing chamber, reduces stress concentration caused by misalignment, and enhances the stability of the entire connection structure under different working conditions.

[0010] Preferably, both the first connecting plate and the second connecting plate are long strip-shaped structures with arc-shaped ends. The first connecting plate and the second connecting plate have the same length and width, which ensures that the connecting plate has a certain strength and toughness, can withstand the tension and pressure during the operation of the mechanism, and will not interfere with the surrounding components during installation. The same size facilitates the processing and positioning of the connecting holes.

[0011] Preferably, the center of the end circle of the first connecting hole away from the second connecting hole is concentrically set with the center of the corresponding end circle of the first connecting plate; the second connecting hole is concentrically set with the center of the corresponding end circle of the first connecting plate, so that when the first connecting plate is connected to the mechanism crank arm and the main tie rod of the arc-extinguishing chamber, the force at the connection point is more uniform, avoiding deformation of the connecting plate or loosening of the connection due to eccentric force. Especially during the closing and opening processes, it can ensure that the first connecting plate stably transmits force, ensure the reliability of the connection structure, extend the maintenance cycle of the equipment, and at the same time lock the relative position of the mechanism crank arm and the main tie rod of the arc-extinguishing chamber, preventing the connecting pin from moving in the first connecting hole.

[0012] Preferably, a bushing is fitted on the connecting pin, which can effectively reduce the friction between the connecting pin and the connecting hole, reduce the degree of wear, and extend the service life of the connecting pin and the connecting plate. At the same time, the bushing can also play a buffering role, absorbing some of the energy generated by impact during the operation of the mechanism, reducing damage to the connecting parts, and improving the stability and reliability of the connecting structure.

[0013] This invention provides a disassembly and assembly method, comprising: when the main tie rod of the arc-extinguishing chamber is in a free state, the mechanism crank arm is in a closed state; the mechanism crank arm and the main tie rod of the arc-extinguishing chamber are initially connected using a first connecting plate and a connecting pin; after the connection is completed, the mechanism crank arm uses the first connecting plate to drive the main tie rod of the arc-extinguishing chamber to the circuit breaker open position. During the initial connection, the mechanism crank arm can be quickly connected to the main tie rod of the arc-extinguishing chamber in a free state; and during the subsequent process of driving the main tie rod of the arc-extinguishing chamber to the open position, the elongated hole can automatically compensate for the positional deviation of the main tie rod of the arc-extinguishing chamber, without the need for additional manual adjustment, greatly simplifying the operation process and improving the installation efficiency. After the mechanism crank arm and the main tie rod of the arc-extinguishing chamber are moved to the open position, the second connecting plate is installed on the outside of the first connecting plate and anti-loosening treatment is performed. The assembly between the mechanism crank arm and the main tie rod of the arc-extinguishing chamber is completed, realizing the locking of the relative position between the mechanism crank arm and the main tie rod of the arc-extinguishing chamber in the open state, ensuring the stability of the equipment during operation. The entire assembly process is carried out by first using the first connecting plate to initially connect and adjust the position, and then using the second connecting plate to lock it. The operation is simple and further improves the convenience and efficiency of assembly.

[0014] Preferably, after the initial connection between the mechanism crank arm and the main tie rod of the arc-extinguishing chamber is completed, during the process of the mechanism crank arm moving to the open position, the connecting pin in the first connecting hole moves from the end circle near the second connecting hole to the end circle away from the second connecting hole. The movement distance of the connecting pin is used to compensate for the position deviation of the main tie rod of the arc-extinguishing chamber in the free state. By moving the connecting pin in the elongated hole, the position deviation of the main tie rod of the arc-extinguishing chamber is automatically absorbed, eliminating the need for repeated manual adjustments, ensuring connection accuracy, and reducing potential connection hazards caused by improper human adjustment.

[0015] Preferably, when it is necessary to disassemble the mechanism crank arm and the main tie rod of the arc-extinguishing chamber, the mechanism crank arm drives the main tie rod of the arc-extinguishing chamber to the open position, removes all the second connecting plates, and removes the second connecting plates at the open position. At this time, the relative position of the mechanism crank arm and the main tie rod of the arc-extinguishing chamber is relatively stable, which is convenient for operation and reduces the operational difficulty and safety risks caused by component shaking or position changes during the disassembly process, making the disassembly work safer and more efficient. After all the second connecting plates are removed, the mechanism crank arm is in the closed state. At the same time, the mechanism crank arm drives the main tie rod of the arc-extinguishing chamber to move through the first connecting plate, so that the main tie rod of the arc-extinguishing chamber is in a free state. Then, all the first connecting plates and connecting pins are removed. By utilizing the characteristic that the first connecting plate drives the main tie rod of the arc-extinguishing chamber back to a free state in the closed state, the damage that may be caused to the equipment by forcibly removing the connecting parts is avoided. The entire disassembly process is orderly and safe, conforms to the structural characteristics and working principle of the equipment, and improves the convenience and reliability of equipment maintenance.

[0016] As can be seen from the above technical solutions, the advantages of the present invention are: In the closed state, the mechanism crank arm is initially connected to the main tie rod of the arc-extinguishing chamber in the free state via the first connecting plate. The second connecting plate locks the relative position between the mechanism crank arm and the main tie rod of the arc-extinguishing chamber in the open state. The first connecting hole, with its elongated oval structure, absorbs the dimensional deviation between the main tie rod of the arc-extinguishing chamber in the free state and when it is closed, ensuring connection accuracy. The entire connection process does not require maintaining the non-opening and non-closed positions of the main body of the mechanism. Only the spring mechanism needs to be adjusted for the open and closed positions. This eliminates the need for multiple adjustments to the connection between the mechanism crank arm and the main tie rod of the arc-extinguishing chamber, improving assembly efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1This is a schematic diagram of the initial state of a vacuum circuit breaker according to one or more embodiments of the present invention; Figure 2 for Figure 1 A partially enlarged schematic diagram of the connection point between the mechanism crank arm and the first connecting plate and the main tie rod of the arc-extinguishing chamber in the structure shown; Figure 3 This is a schematic diagram of the open state of a vacuum circuit breaker according to one or more embodiments of the present invention. Figure 4 for Figure 3 A partially enlarged schematic diagram of the connection point between the mechanism crank arm and the first connecting plate and the main tie rod of the arc-extinguishing chamber in the structure shown; Figure 5 This is a schematic diagram of the closed state of a vacuum circuit breaker according to one or more embodiments of the present invention. Figure 6 for Figure 5 A partially enlarged schematic diagram of the connection point between the mechanism crank arm and the first connecting plate and the main tie rod of the arc-extinguishing chamber in the structure shown; Figure 7 This is a schematic diagram of the structure of the first connecting plate according to one or more embodiments of the present invention; Figure 8 This is a schematic diagram of the structure of the second connecting plate according to one or more embodiments of the present invention; Figure 9 This is an assembly diagram of the main tie rod and spring mechanism of the arc-extinguishing chamber according to one or more embodiments of the present invention; The components represented by the various reference numerals in the diagram are: 1. Main body of the mechanism; 2. Crank arm of the mechanism; 3. First connecting plate; 4. Connecting pin; 5. Bushing; 6. Second connecting plate; 7. Main tie rod of the arc extinguishing chamber; 8. First connecting hole; 9. Second connecting hole; 10. Third connecting hole. Detailed Implementation

[0019] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0020] Example 1 In a typical embodiment of the present invention, such as Figure 9As shown, a connection structure between the main tie rod of the arc-extinguishing chamber and the spring mechanism is proposed, including: mechanism crank arm 2, first connecting plate 3, connecting pin 4, second connecting plate 6 and arc-extinguishing chamber main tie rod 7. The mechanism crank arm 2 is rotatably mounted on the mechanism body 1 of the spring mechanism. The mechanism crank arm 2 is hinged to the arc-extinguishing chamber main tie rod 7 through the first connecting plate 3, the second connecting plate 6 and the connecting pin 4.

[0021] The first connecting plate 3 and the second connecting plate 6 are both long strip-shaped structures with arc-shaped ends. The first connecting plate 3 and the second connecting plate 6 are both made of high-strength metal, and the length and width of the first connecting plate 3 and the second connecting plate 6 are the same.

[0022] like Figure 7 As shown, the first connecting plate 3 is provided with a first connecting hole 8 and a second connecting hole 9. The first connecting hole 8 is an oblong hole (i.e., a long oval hole) and is set along the length of the first connecting plate 3. The second connecting hole 9 is a round hole. The first connecting hole 8 is set at one end of the first connecting plate 3, and the second connecting hole 9 is set at the other end of the first connecting plate 3. The center of the end circle of the first connecting hole 8 away from the second connecting hole 9 is concentric with the center of the end circle of the corresponding end of the first connecting plate 3. The center of the second connecting hole 9 is concentric with the center of the end circle of the other end of the first connecting plate 3. The first connecting hole 8 is used to connect with the mechanism crank arm 2, and the second connecting hole 9 is used to connect with the main tie rod 7 of the arc extinguishing chamber.

[0023] The first connecting hole 8 of the elongated hole structure absorbs the dimensional deviation X between the main tie rod 7 of the arc-extinguishing chamber in the free state and when it is closed. At the same time, the first connecting plate 3 can ensure that when the main body 1 of the mechanism is in the open state, the main tie rod 7 of the arc-extinguishing chamber is also in the open state.

[0024] Specifically, the dimension of the middle part of the first connecting hole 8, that is, the distance between the centers of the two end circles of the first connecting hole 8, is the same as the dimensional deviation X of the main tie rod 7 of the arc-extinguishing chamber in the free state and when it is closed. This can absorb and compensate for the dimensional deviation X of the main tie rod 7 of the arc-extinguishing chamber in the free state and when it is closed, ensuring the connection accuracy. The entire connection process does not require maintaining the non-opening and non-closing positions of the main body 1 of the mechanism, so that the connection between the crank arm 2 of the mechanism and the main tie rod 7 of the arc-extinguishing chamber does not need to be adjusted multiple times, improving the assembly efficiency. In practical applications, machining tolerances, such as X+5mm, can also be considered.

[0025] The second connecting plate 6 is used to lock the relative position between the mechanism crank arm 2 and the main tie rod 7 of the arc-extinguishing chamber when the circuit is open. Figure 8 As shown, the second connecting plate 6 has two third connecting holes 10. Specifically, each end of the second connecting plate 6 has a third connecting hole 10. The third connecting hole 10 is a round hole and is concentric with the center of the end circle of the corresponding end of the second connecting plate 6.

[0026] During assembly and use, the third connecting hole 10 on the second connecting plate 6, which is used to connect with the main tie rod 7 of the arc-extinguishing chamber, is coaxially set with the second connecting hole 9 on the first connecting plate 3; the third connecting hole 10 on the second connecting plate 6, which is used to connect with the mechanism crank arm 2, is coaxially set with the end circle (i.e. the end circle away from the second connecting hole 9) of the first connecting hole 8 on the first connecting plate 3, which is used to connect with the mechanism crank arm 2. Thus, the position of the connecting pin 4 can be restricted by the second connecting plate 6 to ensure the stability of the connection between the mechanism crank arm 2 and the main tie rod 7 of the arc-extinguishing chamber.

[0027] like Figure 4 As shown, there are two first connecting plates 3, which are clamped on both sides of the connecting end of the mechanism crank arm 2 and the main tie rod 7 of the arc-extinguishing chamber, so as to initially connect the mechanism crank arm 2 and the main tie rod 7 of the arc-extinguishing chamber. There are also two second connecting plates 6, which are distributed on the outside of the two first connecting plates 3, so as to clamp the two first connecting plates 3. At the same time, the two ends of the first connecting plates 3 and the second connecting plates 6 are connected to the adjacent mechanism crank arm 2 and the main tie rod 7 of the arc-extinguishing chamber through connecting pins 4, so as to limit the first connecting plates 3 and the second connecting plates 6 by using connecting pins 4.

[0028] In this embodiment, the radius of the connecting pin 4 is the same as the end circle of the first connecting hole 8, the second connecting hole 9, and the third connecting hole 10.

[0029] To improve the overall service life of the connection structure, a bushing 5 is also provided. The bushing 5 is a metal sleeve structure and is fitted onto the connecting pin 4 to reduce wear between the connecting pin 4 and the first connecting plate 3, the second connecting plate 6, the mechanism crank arm 2, and the main tie rod 7 of the arc extinguishing chamber.

[0030] Example 2 In a typical embodiment of the present invention, a disassembly and assembly method is proposed, which adopts the connection structure between the main tie rod of the arc-extinguishing chamber and the spring mechanism mentioned in Embodiment 1, and includes the following process: like Figure 1 and Figure 2 As shown, when the main pull rod 7 of the arc-extinguishing chamber is in a free state, the crank arm 1 of the mechanism is in a closed state. The crank arm 2 of the mechanism is initially connected to the main pull rod 7 of the arc-extinguishing chamber by the first connecting plate 3 and the connecting pin 4. After the connection is completed, the crank arm 2 of the mechanism uses the first connecting plate 3 to drive the main pull rod 7 of the arc-extinguishing chamber to move to the circuit breaker open position.

[0031] Specifically, when the main tie rod 7 of the arc-extinguishing chamber is in a free state, the actual position of the main tie rod 7 of the arc-extinguishing chamber is higher than the closed position, and the position deviation is X. Adjust the crank arm 1 of the mechanism so that the crank arm 1 is in the closed state. Then, use the connecting pin 4 to connect the second connecting hole 9 on the first connecting plate 3 to the main tie rod 7 of the arc-extinguishing chamber; and use the connecting pin 4 to connect the first connecting hole 8 on the first connecting plate 3 to the crank arm 2 of the mechanism. At this time, the connecting pin 4 connected to the crank arm 2 of the mechanism is located at the end circle of the first connecting hole 8 near the second connecting hole 9. After the first connecting plate 3 is connected to the mechanism crank arm 2 and the main tie rod 7 of the arc-extinguishing chamber, the mechanism crank arm 2 moves to the open position. At the same time, the mechanism crank arm 2 drives the main tie rod 7 of the arc-extinguishing chamber to move to the open position through the first connecting plate 3. During the movement, the connecting pin 4 in the first connecting hole 8 moves from the end circle near the second connecting hole 9 to the end circle away from the second connecting hole 9. The moving distance of the connecting pin 4 is X, in order to compensate for the position deviation dimension X of the main tie rod 7 of the arc-extinguishing chamber in the free state. When the connecting pin 4 has not moved to the end circle away from the second connecting hole 9, the main tie rod 7 of the arc-extinguishing chamber does not move. After the connecting pin 4 moves to the end circle away from the second connecting hole 9 and continues to move, the main tie rod 7 of the arc-extinguishing chamber moves with the mechanism crank arm 2 until it moves to the open position.

[0032] Through the above operations, the dimensional deviation X between the main tie rod 7 of the arc-extinguishing chamber in the free state and when it is closed can be absorbed and compensated, ensuring the connection accuracy. The entire connection process does not require adjustment and maintenance of the non-opening and non-closing positions of the spring mechanism. Only the opening and closing positions of the spring mechanism need to be adjusted, so that the connection between the mechanism crank arm 2 and the main tie rod 7 of the arc-extinguishing chamber does not need to be adjusted multiple times, effectively improving the assembly efficiency and accuracy.

[0033] like Figure 3 and Figure 4 As shown, after the mechanism crank arm 2 and the main tie rod 7 of the arc-extinguishing chamber move to the open position, the second connecting plate 6 is installed on the outside of the first connecting plate 3 and anti-loosening treatment is performed (such as connecting cotter pins and other limiting structures). Then, under the action of the third connecting hole 10, the position of the two connecting pins 4 is restricted, ensuring the firmness and stability of the connection between the mechanism crank arm 2 and the main tie rod 7 of the arc-extinguishing chamber. At this time, the assembly between the mechanism crank arm 2 and the main tie rod 7 of the arc-extinguishing chamber is completed. Figure 5 and Figure 6 As shown, the crank arm 2 of the mechanism can drive the main tie rod 7 of the arc-extinguishing chamber to complete the opening and closing operation of the circuit breaker.

[0034] When it is necessary to disassemble the mechanism crank arm 2 and the main tie rod 7 of the arc-extinguishing chamber, the mechanism crank arm 2 is moved to the open position, and at the same time, the first connecting plate 3 and the second connecting plate 6 are used to drive the main tie rod 7 of the arc-extinguishing chamber to move to the open position, so that both the mechanism crank arm 2 and the main tie rod 7 of the arc-extinguishing chamber are in the open state, and then all the second connecting plates 6 are removed. After all the second connecting plates 6 are removed, the main body 1 of the drive spring mechanism completes the closing operation, so that the mechanism crank arm 2 is in the closed state. At the same time, the mechanism crank arm 2 drives the arc-extinguishing chamber main tie rod 7 to move through the first connecting plate 3. Due to the influence of the first connecting hole 8, the arc-extinguishing chamber main tie rod 7 cannot be closed in place. At this time, the arc-extinguishing chamber main tie rod 7 is in a free state. The actual position of the arc-extinguishing chamber main tie rod 7 is higher than the closed position, and the position deviation dimension is X. Then, all the first connecting plates 3 and connecting pins 4 are removed to complete the disassembly between the mechanism crank arm 2 and the arc-extinguishing chamber main tie rod 7.

[0035] The first connecting hole 8 can compensate for the positional deviation of the main tie rod 7 of the arc-extinguishing chamber in a free state, eliminating the need for slow opening and closing operations of the spring mechanism, and significantly improving the overall matching efficiency. Throughout the assembly process, the first connecting plate 3 and the second connecting plate 6 ensure that the opening and closing positions are in place without additional adjustment, making the structure simple and reliable. The connecting components are only the connecting plate and the connecting pin 4, making the whole easy to produce and with low production costs. The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A connection structure between the main tie rod of an arc-extinguishing chamber and a spring mechanism, comprising: The mechanism crank arm (2) and the main tie rod (7) of the arc-extinguishing chamber are characterized in that the mechanism crank arm (2) is hinged to the main tie rod (7) of the arc-extinguishing chamber through a first connecting plate (3), a second connecting plate (6) and a connecting pin (4); The first connecting plate (3) is used for the initial connection between the mechanism crank arm (2) in the closed state and the main tie rod (7) of the arc-extinguishing chamber in the free state; the second connecting plate (6) is used for locking the relative position between the mechanism crank arm (2) and the main tie rod (7) of the arc-extinguishing chamber in the open state; The first connecting plate (3) is provided with a first connecting hole (8) at one end connected to the mechanism crank arm (2), and a second connecting hole (9) at the other end connected to the main tie rod (7) of the arc-extinguishing chamber. The first connecting hole (8) is an oblong hole, and the second connecting hole (9) is a round hole. The distance between the centers of the two end circles of the first connecting hole (8) is the same as the dimensional deviation from the position of the main tie rod (7) of the arc-extinguishing chamber in its free state to when it is closed. The second connecting plate (6) is provided with a third connecting hole (10) at each end. The third connecting hole (10) is a round hole. The second connecting plate (6) is located outside the first connecting plate (3). The third connecting hole (10) on the second connecting plate (6) for connecting to the main tie rod (7) of the arc-extinguishing chamber is coaxial with the second connecting hole (9). The third connecting hole (10) on the second connecting plate (6) for connecting to the mechanism crank arm (2) is coaxial with the end circle on the first connecting hole (8) for connecting to the mechanism crank arm (2).

2. The connection structure between the main tie rod and the spring mechanism of the arc-extinguishing chamber according to claim 1, characterized in that, The third connecting hole (10) is concentric with the end center of the corresponding second connecting plate (6).

3. The connection structure between the main tie rod and the spring mechanism of the arc-extinguishing chamber according to claim 1, characterized in that, The first connecting plate (3) and the second connecting plate (6) are both long strip-shaped structures with arcs at both ends. The length and width of the first connecting plate (3) and the second connecting plate (6) are the same.

4. The connection structure between the main tie rod and the spring mechanism of the arc-extinguishing chamber according to claim 1, characterized in that, The center of the first connecting hole (8) at one end away from the second connecting hole (9) is concentric with the center of the corresponding end of the first connecting plate (3); the second connecting hole (9) is concentric with the center of the corresponding end of the first connecting plate (3).

5. The connection structure between the main tie rod and the spring mechanism of the arc-extinguishing chamber according to claim 1, characterized in that, A bushing (5) is fitted on the connecting pin (4).

6. A method for disassembling and assembling, characterized in that, The connection structure of the main pull rod of the arc-extinguishing chamber and the spring mechanism as described in any one of claims 1-5 is adopted, including: when the main pull rod (7) of the arc-extinguishing chamber is in a free state, the crank arm (2) of the mechanism is in a closed state, and the crank arm (2) of the mechanism and the main pull rod (7) of the arc-extinguishing chamber are initially connected by the first connecting plate (3) and the connecting pin (4). After the connection is completed, the crank arm (2) of the mechanism drives the main pull rod (7) of the arc-extinguishing chamber to move to the circuit breaker opening position by means of the first connecting plate (3); After the mechanism crank arm (2) and the main tie rod (7) of the arc-extinguishing chamber are moved to the opening position, the second connecting plate (6) is installed on the outside of the first connecting plate (3), and the assembly between the mechanism crank arm (2) and the main tie rod (7) of the arc-extinguishing chamber is completed.

7. The disassembly and assembly method according to claim 6, characterized in that, After the mechanism crank arm (2) is initially connected to the main tie rod (7) of the arc-extinguishing chamber, during the process of the mechanism crank arm (2) moving to the opening position, the connecting pin (4) in the first connecting hole (8) moves from the end circle close to the second connecting hole (9) to the end circle far away from the second connecting hole (9). The moving distance of the connecting pin (4) is used to compensate for the position deviation of the main tie rod (7) of the arc-extinguishing chamber in the free state.

8. The disassembly and assembly method according to claim 6, characterized in that, When it is necessary to disassemble the mechanism crank arm (2) and the main tie rod (7) of the arc-extinguishing chamber, the mechanism crank arm (2) drives the main tie rod (7) of the arc-extinguishing chamber to move to the trip position and remove all the second connecting plates (6). After all the second connecting plates (6) are removed, the mechanism crank arm (2) is in the closed state. At the same time, the mechanism crank arm (2) drives the main tie rod (7) of the arc-extinguishing chamber to move through the first connecting plate (3), so that the main tie rod (7) of the arc-extinguishing chamber is in the free state. Then, all the first connecting plates (3) and connecting pins (4) are removed.

Images