An interlocking mechanism for a vacuum circuit breaker

Abstract

A locking mechanism for a vacuum circuit breaker, comprising: a panel locking plate that can slide in a vertical direction relative to a box body, an isolation main shaft and a grounding main shaft located at both ends of the panel locking plate in the moving direction, and corresponding operating holes are provided on the box panel; an isolation interlocking mechanism, comprising an isolation interlocking crank arm, and a linkage piece is provided at one end of the isolation interlocking crank arm; a grounding interlocking mechanism, comprising a grounding interlocking crank arm and a grounding locking plate, and the grounding locking plate can be moved to the bottom of the panel locking plate under the drive of the grounding interlocking crank arm; an isolation locking piece, which can be rotatably arranged on the upper back side of the panel locking plate and forms a linkage cooperation with the linkage piece, and the lower end of the isolation locking piece is provided with an undercut toward the side wall of the box body, and the undercut has a tendency to move toward the side wall of the box body, and the upper end of the isolation locking piece is provided with a mating portion that cooperates with the linkage piece. By coordinating the three positions of the panel locking plate, the interlocking of the vacuum circuit breaker in various states is realized, and the interlocking control between each disconnector, earthing switch and opening and closing switch is realized by it. It has a simple structure, occupies a small space, and greatly reduces the production cost.

Description

Technical Field

[0001] The present invention relates to the field of vacuum circuit breakers, and in particular to a chain mechanism for vacuum circuit breakers. Background Art

[0002] Vacuum circuit breakers use vacuum as the insulation and arc-extinguishing medium between contacts. Due to their small size and light weight, they are widely used in distribution networks. Many industrial and mining enterprises, power plants, and substations use vacuum circuit breakers for the protection and control of electrical equipment.

[0003] During the use of vacuum circuit breakers, the opening and closing sequence of the circuit breaker and disconnector must be well controlled to avoid danger and damage caused by improper operation. When the circuit breaker is in the closed position, the disconnector is not allowed to be opened or closed. At the same time, the state of the disconnector does not affect the free operation of the circuit breaker.

[0004] Most of the current isolation interlocking mechanisms are directly integrated into the operating mechanism of the vacuum circuit breaker. The interlocking action between the circuit breaker and the disconnector is achieved through a complex connecting rod mechanism and the yaw transmission between the connecting rods. Because the connecting rods have a relative rotational motion relationship, jamming may occur during operation. In addition, the large number of connecting rods makes it inconvenient for technicians to install and debug.

[0005] At the same time, the complex linkage mechanism will make the size of the entire operating mechanism larger, affecting the development of miniaturization, and its cost is relatively high. Summary of the Invention

[0006] In view of the shortcomings of the prior art, an object of the present invention is to provide an interlocking mechanism for a vacuum circuit breaker.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A locking mechanism for a vacuum circuit breaker, comprising:

[0009] A panel locking plate that can slide vertically relative to the box body, and the panel locking plate has an inoperable position, an isolation operation position and a grounding operation position that are arranged in sequence.

[0010] An isolation spindle and a grounding spindle are located at both ends of the panel locking plate in the moving direction, and corresponding operation holes are provided on the box panel;

[0011] The isolation interlocking mechanism comprises an isolation interlocking crank arm linked with the isolation main shaft, and one end of the isolation interlocking crank arm is provided with a linkage member;

[0012] A grounding interlocking mechanism, comprising a grounding interlocking crank arm and a grounding interlocking plate arranged in linkage with the grounding main shaft, wherein the grounding interlocking plate can be moved below the panel locking plate under the drive of the grounding interlocking crank arm;

[0013] The isolation chain piece is rotatably arranged on the back of the upper end of the panel locking plate and forms a linkage with the linkage piece. The lower end of the isolation chain piece is provided with an undercut toward the side wall of the box body, and the undercut has a tendency to move toward the side wall of the box body. The upper end of the isolation chain piece is provided with a matching portion that matches the linkage piece.

[0014] When the panel locking plate is placed in the inoperable position, the upper and lower ends of the panel locking plate respectively block the operating holes of the isolation spindle and the grounding spindle;

[0015] When the panel locking plate is placed in the isolation operation position, the operation hole of the isolation main shaft is exposed and the operation hole of the grounding main shaft is blocked. When the isolation interlocking crank arm is in isolation closing, it is located above the movement path of the panel locking plate. When the isolation interlocking crank arm is in isolation opening, it rotates relative to the panel locking plate to release the limit on the upward movement of the panel locking plate, and the undercut of the isolation interlocking piece and the limit groove on the box body form a limit to limit the downward movement of the panel locking plate.

[0016] When the panel locking plate is placed in the grounding operation position, the operating hole of the grounding main shaft is exposed and the operating hole of the isolation main shaft is blocked, and the grounding interlocking plate moves to the bottom of the panel locking plate when the ground is closed.

[0017] The inner side of the panel locking plate is provided with a first limiting portion which cooperates with the linkage member to limit the moving direction.

[0018] A matching surface is provided on the upper end of the isolation interlocking piece, and the linkage member can act on the matching surface to cause the isolation interlocking piece to rotate.

[0019] A closing lock interlock plate is provided on the side wall of the operating mechanism, and an elastic member is provided between the closing lock interlock plate and the operating mechanism to drive it to move upward, and a second limiting portion is provided on the inner side of the panel locking plate to drive the closing lock interlock plate to move downward.

[0020] The panel locking plate is provided with an operating member for driving it to move up and down, and the operating member passes through the panel locking plate and forms a second limiting portion for driving the closing locking interlocking plate to move downward.

[0021] A trigger switch is provided on the operating mechanism, and a third limiting portion is provided on the inner side of the panel locking plate, which can trigger the trigger switch when the panel locking plate moves to an inoperable position.

[0022] The grounding interlocking plate can be horizontally slidably arranged in the box body, and one end of the grounding interlocking plate is provided with a bending portion, and the lower end of the panel locking plate is provided with a fourth limiting portion that forms a limiting cooperation with the bending portion.

[0023] A cabinet door interlocking mechanism is also provided in the box body.

[0024] The cabinet door interlocking mechanism comprises an interlocking bracket which is swingably arranged in the box body and an interlocking plate which is linked with the interlocking bracket.

[0025] Beneficial effects of the present invention: The present application realizes the interlocking of the vacuum circuit breaker in various states by linking the three positions of the panel locking plate, and the interlocking control between each disconnector, earthing switch and opening and closing switch is realized by it. It has a simple structure, occupies a small space, and greatly reduces the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The figure is a schematic structural diagram of the present invention applied to a vacuum circuit breaker.

[0027] Figure 2 It is the front view of the present invention.

[0028] Figure 3 It is a structural schematic diagram of the present invention.

[0029] Figure 4 for Figure 3 Enlarged schematic diagram of point A in the middle.

[0030] Figure 5 It is a structural diagram of the fitting part between the panel locking plate and the operating shaft.

[0031] Figure 6 It is a structural diagram of the panel locking plate and the grounding interlocking plate.

[0032] Figure 7 It is a structural diagram of the panel locking plate and isolation interlocking piece.

[0033] Figure 8 It is a partial schematic diagram of the closing and locking interlocking plate.

[0034] Figure 9 It is a structural diagram when the panel locking plate is in an inoperable position.

[0035] Figure 10 This is a structural diagram of the panel locking plate when it is in the isolation operation position.

[0036] Figure 11 It is a structural diagram of the panel locking plate when it is in the grounding operating position.

[0037] Figure 12It is a schematic diagram of the inner structure when the panel locking plate is in the earthing operation position.

[0038] Figure 13 It is a schematic diagram of the cooperation between the isolating interlock crank arm and the panel locking plate. Specific embodiments

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0040] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0041] As Figure 1 shown, the present invention discloses an interlocking mechanism for a vacuum circuit breaker, which is mainly applied to the vacuum circuit breaker, mainly to achieve the interlock between the earthing switch, the isolating switch and the operating mechanism, ensuring that in the closing state, the earthing switch and the isolating switch cannot be operated, or in the state of isolating switch closed, the earthing switch cannot be operated, or in the state of earthing switch open, the isolating switch cannot be operated, or in the state of isolating switch open, the closing operation cannot be performed.

[0042] At the same time, the interlocking mechanism is composed of a panel locking plate 500, an isolating interlocking mechanism 400, an earthing interlocking mechanism 600, and an isolating interlocking piece 900. It realizes the switching of each interlocking state through the vertical movement of the panel locking plate 500. The panel locking plate can be slidably arranged on the box body 100 and can be operated by an external force to move in the vertical direction of the box body, moving up or down. It has three positions, including the non-operable position 10, the isolating operation position 20, and the earthing operation position 30, and can realize the movement in the direction of non-operable position 10 - isolating operation position 20 - earthing operation position 30 or earthing operation position 30 - isolating operation position 20 - non-operable position 10. The conversion between each position needs to meet the corresponding operations, thereby realizing the interlock of each position switch and ensuring that other structures cannot be operated when in each position.

[0043] See Figure 2 and Figure 3, a panel locking plate 500 that can slide vertically relative to the box body 100, and the panel locking plate 500 has an inoperable position 10, an isolation operation position 20, and a grounding operation position 30 arranged in sequence. A trap door is provided on the panel of the box body, the panel locking plate is placed inside the panel, the operating member 520 passes through the trap door 50 and is fixedly connected to the panel locking plate 500 arranged inside the panel, and can be moved up and down along the trap door 50 by operating the operating member 520. For this, a plurality of sliding grooves 51 are provided on the trap door 50, and the sliding groove cooperating with the operating member 520 is set as a gear groove 52, which is convenient for intuitively understanding which position the current operating member 520 moves to, and further more intuitively understanding the position where the panel locking plate 500 is located. And the other sliding grooves can be used as guiding grooves or can also play a role in limiting the maximum moving distance, that is, the panel locking plate 500 is provided with a limiting column, which can be locked to the panel locking plate by a bolt, and the bolt passes through the sliding groove, so as to realize the design of the moving distance by using the sliding groove.

[0044] An isolation main shaft 200 and a grounding main shaft 300 located at both ends of the moving direction of the panel locking plate 500, and corresponding operation holes are provided on the panel of the box body 100. The isolation main shaft 200 is used to drive the disconnector to act, and the grounding main shaft 300 is used to drive the earthing switch to act, and the isolation main shaft 200 or the grounding main shaft 300 can be manually operated through the operation hole.

[0045] An isolation interlock mechanism 400, which includes an isolation interlock crank arm 210 linked with the isolation main shaft 200, and a linkage member 230 is provided at one end of the isolation interlock crank arm 210. The isolation interlock crank arm 210 is linked with the isolation main shaft, and the two are limited by a non-circular shaft and a non-circular hole, so as to realize the synchronous rotation of the isolation main shaft 200 driving the isolation interlock crank arm 210, and then realize the switching between isolation opening and isolation closing.

[0046] An isolation state indicator 220 is fixedly provided on the isolation interlock crank arm 210 through a support arm, and the isolation state indicator moves with the rotation of the isolation interlock crank arm 210, so as to realize the state indication of isolation closing and isolation opening. At the same time, the isolation interlock crank arm 210 and the panel locking plate 500 form a limit fit. That is, in the state of isolation closing, the linkage member 230 of the isolation interlock crank arm 210 is located above the moving path of the panel locking plate 500, so as to limit the panel locking plate 500 from moving from the isolation operation position to the grounding operation position. Only when the isolation main shaft enters the isolation opening state can this limit be released, so that the panel locking plate can continue to move to the grounding operation position.

[0047] The isolation interlocking crank arm is a cam structure, which will make room for the panel locking plate to move upward when it swings. The linkage member is a columnar structure directly formed or fixed on the isolation interlocking crank arm. The inner side of the panel locking plate 500 is provided with a first limiting portion 530 that cooperates with the linkage member 230 to limit the movement direction. The first limiting portion is directly formed by a local bend of the panel locking plate, and the first limiting portion 530 will be restricted by the linkage member when it moves upward, such as Figure 13 As shown, it is restricted from continuing to move upward, and only the isolation interlocking arm is rotated to the isolation state, so that the linkage member leaves the moving path of the first limiting portion 530, and the restriction on the panel locking plate is released. At the same time, the linkage member 230 can form a linkage with the isolation chain plate, that is, when the isolation is closed, the linkage member moves toward the isolation chain plate matching part, driving it to rotate relative to each other, and then releasing the limit between the undercut 910 of the isolation chain plate and the box body 100.

[0048] The grounding interlocking mechanism 600 includes a grounding interlocking arm 620 and a grounding interlocking plate 610 that are interlocked with the grounding main shaft 300. The grounding interlocking plate 610 can be moved to the bottom of the panel locking plate 500 under the drive of the grounding interlocking arm 620.

[0049] The grounding interlock crank arm 620 is connected to the grounding interlock plate through a connecting rod. The grounding interlock plate is driven to move horizontally by the swing of the grounding interlock crank arm, thereby partially blocking the operating hole of the grounding main shaft.

[0050] At the same time, a synchronously acting grounding status indicator plate 630 is provided on the grounding interlocking plate 610 . The grounding status indicator plate 630 is located outside the panel, so that the current opening and closing status of the grounding switch can be intuitively understood.

[0051] The isolation interlocking piece 900 can be rotatably arranged on the back side of the upper end of the panel locking plate 500, and forms a linkage with the linkage part 230, and the lower end of the isolation interlocking piece 900 is provided with an undercut 910 toward the side wall of the box body 100, and the undercut 910 has a tendency to move toward the side wall of the box body 100, and the upper end of the isolation interlocking piece 900 is provided with a mating portion 920 that cooperates with the linkage part 230.

[0052] The isolation interlocking piece 900 is fixed to the back of the panel locking plate 500 through a rotating shaft. Its middle position is rotatably connected to the panel locking plate 500. The upper end thereof is provided with a mating portion for cooperating with the linkage member 230. This mating portion is an inclined surface. Thus, when the linkage member 230 acts on this mating portion, the isolation interlocking piece can be pressed to rotate. And its lower end is provided with an undercut 910, which is arranged facing the side wall of the box body. And the box body is provided with a limiting groove at the height of the isolation operation position and the grounding operation position. An elastic member for moving the undercut towards the side wall of the box body is provided between the isolation interlocking piece 900 and the operating mechanism. This elastic member is a tension spring. When the panel locking plate moves upward to the isolation operation position, the undercut moves towards the side wall of the box body and snaps into the limiting groove. Thus, when isolating, the limiting cooperation formed by the undercut and the box body can prevent the panel locking plate from moving downward.

[0053] As Figure 9 shown, when the panel locking plate 500 is placed at the inoperable position 10, the upper and lower ends of the panel locking plate 500 respectively block the operation holes of the isolation main shaft 200 and the grounding main shaft 300. That is, the upper end of the panel locking plate is just near the isolation main shaft 200, and the lower end is just near the grounding main shaft. At the same time, the closing locking interlocking plate 800 is pressed down by the second limiting portion 521, enabling the opening and closing to operate normally.

[0054] As Figure 10 shown, when the panel locking plate 500 is placed at the isolation operation position 20, the operation hole of the isolation main shaft 200 is exposed. That is, the arc-shaped notch 510 of the panel locking plate 500 just moves near the isolation main shaft 200, exposing the operation space of the isolation main shaft 200. The distance by which its lower end moves upward is not enough to expose the operation hole of the grounding main shaft 300, that is, it continues to block the operation hole of the grounding main shaft 300. At the same time, when the isolation interlocking crank 210 is in the isolation closing state, it is above the moving path of the panel locking plate 500. At this time, the upward movement of the panel locking plate is restricted. Thus, it is ensured that the grounding switch cannot be operated in the open circuit state and during isolation closing.

[0055] When the isolation interlocking crank 210 is in the isolation opening state, that is, the isolation main shaft rotates, switching from isolation closing to isolation opening, the isolation interlocking crank rotates relatively and releases the limit on the upward movement of the panel locking plate 500. At the same time, the undercut of the isolation interlocking piece 900 and the limiting groove on the box body 100 form a limit for restricting the downward movement of the panel locking plate 500. That is, in the open circuit state and during isolation opening, the panel locking plate cannot move downward. Only when the isolation interlocking crank 210 switches to the isolation closing state, the linkage member will touch the isolation interlocking piece, causing it to rotate relatively, and the undercut to disengage from the limiting groove, releasing the limit on the downward movement of the panel locking plate.

[0056] AsFigure 11 As shown, when the panel locking plate 500 is placed in the grounding operation position 30, the operation hole of the grounding main shaft 300 is exposed, that is, the panel locking plate continues to move upward and completely leaves the range of the operation hole tube. At the same time, since the arc-shaped notch leaves the operation hole position, the panel locking plate blocks the operation hole of the isolation main shaft 200, that is, when in the grounding operation position, the isolation switch cannot be operated. At the same time, the grounding interlocking plate 610 moves to the bottom of the panel locking plate 500 when the ground is closed, that is, when the isolation is opened, the grounding interlocking plate 610 limits the possibility of the panel locking plate moving downward, thereby achieving the situation that the panel locking plate cannot be operated when the ground is closed. When and only when the grounding switch is opened, the grounding interlocking plate 610 is away from the panel locking plate and can continue to move downward.

[0057] See also Figure 12 When the isolating switch is in the open state, that is, the linkage part is away from the isolating chain plate, and the isolation chain plate moves toward the side wall of the box due to the action of the elastic part, so that the undercut of the isolation chain plate is stuck in the limit groove, thereby limiting the downward movement of the panel locking plate. Only when the isolation is closed can the limit of the undercut and the limit groove be released.

[0058] See also Figure 8 A closing lock interlock plate 800 is provided on the side wall of the operating mechanism, and an elastic member is provided between the closing lock interlock plate 800 and the operating mechanism to drive it to move upward, and a second limiting portion 521 is provided on the inner side of the panel locking plate 500 for driving the closing lock interlock plate 800 to move downward.

[0059] When the panel locking plate leaves the inoperable position, the closing interlock plate 800 is released from the pressure and will move upward under the action of the elastic member, thereby limiting the movement of the motor, thereby avoiding the inability to perform closing operations during maintenance and ensuring safety.

[0060] like Figure 4 As shown, a mating surface 920 is provided at the upper end of the isolation interlocking piece 900, and the linkage member 230 can act on the mating surface 920 and cause the isolation interlocking piece 900 to rotate. The mating surface 920 is an inclined surface or an arc surface, and when the panel locking plate moves upward, it touches the linkage member and causes position deflection, thereby enabling the panel locking plate to move upward normally.

[0061] like Figure 7As shown, an operating member 520 for driving the panel locking plate 500 to move up and down is provided on the panel locking plate 500, and the operating member 520 passes through the panel locking plate 500 and forms a second limiting portion 521 for driving the closing locking interlock plate 800 to move downward. This second limiting portion is directly formed by the operating member and can be used to press down the closing locking interlock plate 800 to release the normal use of the locking motor.

[0062] A trigger switch 40 is provided on the operating mechanism. This trigger switch is used for outputting the opening and closing states. That is, when normal opening and closing operations can be performed, the third limiting portion of the panel locking plate 500 triggers the trigger switch 40. A third limiting portion 540 that can trigger the trigger switch 40 when the panel locking plate 500 moves to the inoperable position 10 is provided inside the panel locking plate 500. This third limiting portion 540 is formed by partial bending of the panel locking plate and is integrally formed directly using the panel locking plate, saving costs.

[0063] See Figure 6 , the grounding interlock plate 610 can be horizontally slidably arranged in the box body 100, and a bent portion 611 is provided at one end thereof. A fourth limiting portion 560 that forms a limiting fit with the bent portion 611 is provided at the lower end of the panel locking plate 500. When the grounding is closed, the grounding interlock plate can move to below the fourth limiting portion 560 and restrict its downward movement.

[0064] See Figure 2 and Figure 3 , a cabinet door interlock mechanism 700 is further provided in the box body 100. The cabinet door interlock mechanism 700 includes an interlock bracket 710 that can be swingably arranged in the box body 100 and an interlock plate 720 that is linked with the interlock bracket 710.

[0065] As Figure 5 shown, the main shaft of the vacuum circuit breaker is linked with the limiting rod 40 through a toggle arm. When the vacuum circuit breaker is in the closing state, the limiting rod 40 extends forward and is placed above the limiting column 550 of the panel locking plate, thereby restricting the movement of the panel locking plate and making the panel locking plate in an inoperable position.

[0066] The embodiments should not be regarded as limitations of the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A locking mechanism for a vacuum circuit breaker, characterized in that: It includes: A panel locking plate (500) is vertically slidable relative to the box body (100), and the panel locking plate (500) has an inoperable position (10), an isolation operation position (20), and a grounding operation position (30) which are sequentially arranged. An isolation main shaft (200) and a grounding main shaft (300) are located at both ends of the panel locking plate (500) in the moving direction, and corresponding operation holes are provided on the panel of the box body (100); An isolation interlocking mechanism (400) comprises an isolation interlocking crank arm (210) arranged in linkage with the isolation main shaft (200), wherein one end of the isolation interlocking crank arm (210) is provided with a linkage member (230); A grounding interlocking mechanism (600) comprising a grounding interlocking crank arm (620) and a grounding interlocking plate (610) arranged in linkage with the grounding main shaft (300), wherein the grounding interlocking plate (610) can be moved to the bottom of the panel locking plate (500) under the drive of the grounding interlocking crank arm (620); The isolation interlocking piece (900) is rotatably arranged on the back side of the upper end of the panel locking plate (500) and forms a linkage with the linkage member (230). The lower end of the isolation interlocking piece (900) is provided with an undercut (910) toward the side wall of the box body (100), and the undercut (910) has a tendency to move toward the side wall of the box body (100). The upper end of the isolation interlocking piece (900) is provided with a mating surface (920) that is mated with the linkage member (230). When the panel locking plate (500) is placed in the inoperable position (10), the upper and lower ends of the panel locking plate (500) respectively block the operating holes of the isolation main shaft (200) and the grounding main shaft (300); When the panel locking plate (500) is placed in the isolation operation position (20), the operation hole of the isolation main shaft (200) is exposed, and the operation hole of the grounding main shaft (300) is blocked; when the isolation interlocking crank arm (210) is in isolation closing, it is located above the movement path of the panel locking plate (500); when the isolation interlocking crank arm (210) is in isolation opening, it rotates relatively to release the limit on the upward movement of the panel locking plate (500), and the undercut of the isolation interlocking piece (900) and the limit groove on the box body (100) constitute a limit to limit the downward movement of the panel locking plate (500); When the panel locking plate (500) is placed in the grounding operation position (30), the operation hole of the grounding main shaft (300) is exposed, and the operation hole of the isolation main shaft (200) is blocked, and the grounding interlocking plate (610) moves to the bottom of the panel locking plate (500) when the grounding is closed.

2. The interlocking mechanism for a vacuum circuit breaker according to claim 1, characterized in that: A first limiting portion (530) is provided on the inner side of the panel locking plate (500) and cooperates with the linkage member (230) to limit the movement direction.

3. The interlocking mechanism for a vacuum circuit breaker according to claim 1, characterized in that: The upper end of the isolation interlocking piece (900) is provided with a matching surface (920), and the linkage member (230) can act on the matching surface (920) to cause the isolation interlocking piece (900) to rotate.

4. The interlocking mechanism for a vacuum circuit breaker according to claim 1, characterized in that: A closing lock interlock plate (800) is provided on the side wall of the operating mechanism, and an elastic member for driving the closing lock interlock plate (800) to move upward is provided between the closing lock interlock plate (800) and the operating mechanism, and a second limiting portion (521) for driving the closing lock interlock plate (800) to move downward is provided on the inner side of the panel locking plate (500).

5. The interlocking mechanism for a vacuum circuit breaker according to claim 4, characterized in that: An operating member (520) for driving the panel locking plate (500) to move up and down is provided on the panel locking plate (500), and the operating member (520) passes through the panel locking plate (500) and forms a second limiting portion (521) for driving the closing locking interlocking plate (800) to move downward.

6. The interlocking mechanism for a vacuum circuit breaker according to claim 1, characterized in that: A trigger switch (40) is provided on the operating mechanism, and a third limiting portion (540) is provided on the inner side of the panel locking plate (500) for triggering the trigger switch (40) when the panel locking plate (500) is moved to an inoperable position (10).

7. The interlocking mechanism for a vacuum circuit breaker according to claim 1, characterized in that: The grounding interlocking plate (610) is horizontally slidably arranged in the box body (100), and one end of the grounding interlocking plate (610) is provided with a bent portion (611). The lower end of the panel locking plate (500) is provided with a fourth limiting portion (560) that forms a limiting fit with the bent portion (611).

8. The interlocking mechanism for a vacuum circuit breaker according to claim 1, characterized in that: A cabinet door interlocking mechanism (700) is also provided in the box body (100).

9. The interlocking mechanism for a vacuum circuit breaker according to claim 8, characterized in that: The cabinet door interlocking mechanism (700) comprises an interlocking bracket (710) swingably arranged in the box body (100) and an interlocking plate (720) arranged in linkage with the interlocking bracket (710).

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