A kind of opening and closing auxiliary device and circuit breaker

Abstract

The utility model discloses a kind of auxiliary device for opening and closing and circuit breaker, for switchgear, including support piece, sliding member, elastic member and first limit piece, sliding member is slidably connected in support piece, and with the movement component of switchgear for performing opening and closing linkage arrangement, to be driven sliding by the movement component;Elastic member is set between sliding member and first limit piece along the sliding direction of sliding member, first limit piece is integrally formed or connected to support piece;In the initial stage of switchgear closing, sliding member is not stretched or not further stretch elastic member, in the subsequent stage of switchgear closing, sliding member slides and stretches elastic member, so that elastic member energy storage;When switchgear opens, the elastic member releases energy storage.The utility model significantly improves the opening speed, and the utility model only plays a role in the subsequent stage of closing, and the influence on closing speed is small.

Description

Technical Field

[0001] This utility model relates to the field of switchgear, and in particular to an auxiliary device for opening and closing circuit breakers. Background Technology

[0002] With the continuous increase in electricity demand, the current that switching equipment (such as circuit breakers) needs to carry and the short-circuit current that it needs to interrupt are also constantly increasing, leading to increasingly higher quality requirements for switching equipment. For example, it is necessary to improve the opening speed to enhance performance. Currently, improving the opening speed can be achieved by increasing the energy of the moving contact. However, if the closing overshoot of the mechanism is large, it will cause the vacuum interrupter (bubble) to bear greater force during the closing process, thereby increasing the static pressure during the closing holding phase, which may cause the bubble to be crushed and fail. In addition, developing high-strength bubbles will increase costs.

[0003] Increasing the opening speed by increasing the opening energy will lead to a decrease in the closing speed, requiring further increases in closing energy. This will increase the strength requirements of the operating and transmission mechanisms, increasing design and manufacturing costs. Furthermore, the increased opening energy will render the existing oil buffer insufficient for the opening buffer requirements, necessitating a re-matching of the appropriate oil buffer. Utility Model Content

[0004] This utility model addresses the technical problems existing in the prior art by providing an auxiliary device for opening and closing circuit breakers. This device can be directly applied to existing switching equipment, significantly improving the opening speed while avoiding adverse effects on the closing speed.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a circuit breaker auxiliary device for switching equipment, including a support member, a sliding member, an elastic member, and a first limiting member. The sliding member is slidably connected to the support member and is linked with the moving part of the switching equipment used to perform circuit breaker operation, so as to be driven by the moving part to slide. The elastic member is disposed between the sliding member and the first limiting member along the sliding direction of the sliding member. The first limiting member is integrally formed or connected to the support member. In the initial stage of closing the switching equipment, the sliding member is not stretched or does not further stretch the elastic member. In the subsequent stage of closing the switching equipment, the sliding member slides and stretches the elastic member, so that the elastic member stores energy. When the switching equipment is opened, the elastic member releases the stored energy.

[0006] In a preferred embodiment, the slider and the moving component are provided with a free travel, so that the slider does not slip during the initial stage of the switchgear closing.

[0007] In a preferred embodiment, the slider is provided with an elongated hole extending along its sliding direction, the elongated hole being connected to the moving component by a pin.

[0008] In a preferred embodiment, the initial stage is the process of the moving contact of the switchgear moving from the starting position of the open state to contacting the stationary contact of the switchgear, and the subsequent stage corresponds to the overtravel stage of the moving contact; the opening stage of the switchgear sequentially includes a first opening stage corresponding to the subsequent stage and a second opening stage corresponding to the initial stage, and the elastic element completes the energy storage release in the first opening stage.

[0009] In a preferred embodiment, the elastic member is in a pre-stretched state in the initial stage; it also includes a second limiting member disposed on the support member, and the sliding member abuts against the second limiting member before being driven by the moving contact or driving mechanism to limit the initial position of the sliding member.

[0010] In a preferred embodiment, the first limiting member and / or the second limiting member are positionally disposed on the support member in an adjustable manner along the sliding direction of the sliding member, so as to adjust the preload of the elastic member.

[0011] In a preferred embodiment, one of the first and second limiting members is connected to the support member by a bolt assembly for adjustable position; the bolt assembly includes a bolt and a plurality of adjusting nuts, the bolt extending along the sliding direction of the sliding member and passing through the first or second limiting member, the plurality of adjusting nuts being threadedly connected to the bolt and distributed on both sides of the first or second limiting member in the sliding direction of the sliding member; the other of the first and second limiting members is integrally formed or fixedly connected to the support member.

[0012] In a preferred embodiment, the support member includes a support frame and two support plates. One end of each support plate is fixed to the same side of the support frame along its axial direction. The other ends of the two support plates extend away from the support frame along the sliding direction of the slider and are parallel to each other, with a gap between the two support plates. The slider includes a sliding body and an auxiliary component. The sliding body is slidably fitted between the support frame and / or the two support plates. The auxiliary component is disposed on the sliding body and abuts against the second limiting component in its initial position. The second limiting component is connected to the support frame. The support plates have openings to avoid at least one of the auxiliary component, the elastic component, and the second limiting component. The first limiting component is disposed between the other ends of the two support plates.

[0013] In a preferred embodiment, the elastic element is a tension spring, one end of which is connected to the first limiting member and the other end of which is connected to the sliding member; or, the other end of which is connected to a connecting member, which is connected to the sliding member.

[0014] In a preferred embodiment, the device further includes a mounting member, wherein the support member is fixedly connected to the mounting member, or the support member is rotatably connected to the mounting member, and the rotation axis of the support member is perpendicular to the sliding direction of the slider; the mounting member is installed on the fixed part of the switchgear.

[0015] This utility model also provides a circuit breaker, including the opening and closing auxiliary device as described above, wherein the circuit breaker constitutes the switching equipment.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This invention comprises a support member, a sliding member, and an elastic member. By controlling the action phase of the elastic member, it releases stored energy during the most critical rigid separation phase, significantly improving the opening speed. This eliminates the need for additional energy in the contact spring used to maintain contact pressure, thereby reducing the strength requirements of the contact spring and significantly saving R&D costs. Furthermore, this invention effectively solves the cost increase problem caused by the increased strength requirements of the opening buffer and overall structure due to the increased energy of the opening spring in existing technologies. Through this design, this invention only functions in the subsequent stage of the switchgear's closing process, having minimal impact on the closing speed. It achieves the desired effect without major modifications to the moving parts of the switchgear, and can be directly applied to existing mature switchgear, further reducing R&D costs.

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the opening and closing auxiliary device and circuit breaker of the present invention are not limited to the embodiments. Attached Figure Description

[0019] Figure 1 This is an exploded view of the opening and closing auxiliary device of this utility model;

[0020] Figure 2 This is a three-dimensional structural schematic diagram of the present invention.

[0021] Figure 3 This is a front view of the present invention with the slider in its initial position;

[0022] Figure 4 This is a front view of the present invention in the state of the elastic element being stretched;

[0023] In the diagram, 1 is a support component; 11 is a support frame; 111 is a guide groove; 12 is a support plate; 121 is a cutout; 2 is a sliding component; 21 is a sliding body; 211 is a long slot; 22 is an auxiliary component; 3 is a first limiting component; 31 / 71 is a hanging hole; 32 / 72 is a connecting hole; 4 is a tension spring; 5 is a second limiting component; 6 is a bolt assembly; 61 is a bolt; 62 is an adjusting nut; 63 is a fixing nut; 64 is a washer; 7 is a connecting component; and 8 is a fastener. Detailed Implementation

[0024] In this invention, the terms "first," "second," etc., are used only to distinguish similar objects, not to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0025] Please see Figures 1-4 As shown, this utility model discloses an auxiliary device for opening and closing circuit breakers, applied to switchgear (such as circuit breakers). It includes a support member 1, a sliding member 2, an elastic member, and a first limiting member 3. The support member 1 is connected to a fixed part of the switchgear. The sliding member 2 is slidably connected to the support member 1 and is linked to a moving component of the switchgear used for opening and closing, so that it is driven to slide by the moving component. The elastic member is disposed between the sliding member 2 and the first limiting member 3 along the sliding direction of the sliding member 2. The first limiting member 3 is integrally formed or connected to the support member 1. In the initial stage of closing the switchgear, the sliding member 2 is not stretched or further stretched by the elastic member. In the subsequent stage of closing the switchgear, the sliding member 2 slides and stretches the elastic member, allowing the elastic member to store energy for opening. When the switchgear opens, the elastic member releases the stored energy, providing opening energy for the moving contact of the switchgear to move in the opening direction, thereby increasing the opening speed. Specifically, the opening phase of the switchgear sequentially includes a first opening phase and a second opening phase. In the first opening phase, the elastic element releases its stored energy, providing opening energy to the moving contact and its connected transmission mechanism. In the second opening phase, the elastic element no longer provides energy for opening. After the second opening phase, the entire opening and closing auxiliary device returns to its initial state. The first opening phase corresponds to the subsequent phase of the switchgear closing, and the second opening phase corresponds to the initial phase of the switchgear closing.

[0026] In a preferred embodiment, a free travel is provided between the slider 2 and the moving part of the switchgear, so that the slider 2 does not slip during the initial stage of the switchgear closing. This design not only utilizes the free travel to control the elastic element in stages, but also makes the overall structure simpler, with fewer parts, lower cost, and convenient installation. Specifically, the slider 2 is provided with an elongated hole 211 extending along its sliding direction, and this elongated hole 211 is connected to the moving part of the switchgear by a pin.

[0027] In a preferred embodiment, the initial stage of closing the switchgear is the process of the moving contact moving from its initial open position to contacting the stationary contact. The subsequent closing stage corresponds to the overtravel phase of the moving contact. This design ensures that the elastic element does not affect the closing speed of the moving contact during the initial closing stage, thus guaranteeing the performance of the switchgear. In other embodiments, the initial stage refers to the process before the moving contact moves from its initial position to contact the stationary contact. This design also ensures that the elastic element does not affect the initial closing speed of the moving contact, thereby ensuring smoother and more reliable operation of the switchgear, reducing mechanical shock, improving overall operating efficiency, and extending the service life of the equipment.

[0028] In a preferred embodiment, the elastic element is in a pre-tensioned state during the initial closing phase of the switchgear, i.e., the elastic element adopts a pre-tension design. This design allows the energy of the elastic element to be released during the critical rigid opening phase, thereby significantly improving the rigid opening speed. This improvement solves the problem of needing to strengthen the strength of the opening buffer and the overall mechanism due to the increased energy of the opening spring in the original solution, reducing costs; on the other hand, it eliminates the need to increase the energy of the contact spring (i.e., the moving contact) used to maintain the contact clamping force, thus avoiding the need to increase the strength requirements of the spring and significantly saving R&D costs. In this embodiment, the elastic element is a tension spring 4, but it is not limited to this, and other elastic elements that are elastic and can be stretched can also be selected according to actual needs. One end of the tension spring 4 is connected to the first limiting member 3, and the other end of the tension spring 4 is connected to a connecting member 7, which is connected to the sliding member 2. The connecting member 7 and the first limiting member 3 are both plate-shaped and have hanging holes 31 / 71 and connecting holes 32 / 72. The two ends of the tension spring 4 are respectively hooked into the hanging holes 71 of the connecting member 7 and the first limiting member 3. The connecting hole 72 of the connecting member 7 is connected to the sliding member 2 using a fastener 8. The connecting hole 32 of the first limiting member 3 is also connected to the support member 1 using a fastener (not shown in the figure). The fastener 8 can be a screw, or it can include a bolt and a nut compatible with the bolt. In other embodiments, the other end of the tension spring 4 is directly connected to the sliding member 2; for example, the other end of the tension spring 4 is directly hooked into the sliding member 2.

[0029] This utility model also includes a second limiting member 5, which is disposed on the support member 1. Before the sliding member 2 is driven by the passive contact or the driving mechanism, it abuts against the second limiting member 5 to limit the initial position of the sliding member 2, thereby ensuring the pre-tension effect of the elastic member on the sliding member 2 and giving the elastic member a pre-tension force.

[0030] Furthermore, the first limiting member 3 and / or the second limiting member 5 are adjustable in position to the support member 1 along the sliding direction of the sliding member 2, so as to adjust the preload of the elastic member to match the energy and load required by the switching equipment. Specifically, one of the first limiting member 3 and the second limiting member 5 is connected to the support member 1 by a bolt assembly 6 for adjustable position, while the other of the first limiting member 3 and the second limiting member 5 is integrally formed or fixedly connected to the support member 1. Fixed connection means that the positions of the two connected parts are relatively fixed. This connection method can be either non-removable or removable.

[0031] The bolt assembly 6 includes a bolt 61 and multiple adjusting nuts 62. The bolt 61 extends along the sliding direction of the sliding member 2 and passes through the first limiting member 3 or the second limiting member. The multiple adjusting nuts 62 are threadedly connected to the bolt 61 and are distributed on both sides of the first limiting member 3 or the second limiting member 5 in the sliding direction of the sliding member 2. In this embodiment, the second limiting member 5 is adjustable, and two adjusting nuts 62 are provided as an example, with the two adjusting nuts 62 located on both sides of the second limiting member 5. When it is necessary to adjust the preload of the tension spring 4, simply rotate each adjusting nut 62 to adjust the position of the second limiting member 5. The bolt assembly 6 also includes a fixing nut 63. After the thread of the bolt 61 passes through the support member 1, the fixing nut 63 is screwed on, and the fixing nut 63 restricts the relative position of the bolt 61 and the support member 1. Washers 64 are provided between each adjusting nut 62 and the second limiting member 5, between the fixing nut 63 and the support member 1, and between the head of the bolt 61 and the support member 1. The washers 64 pass through the bolt 61. In this embodiment, there are two second limiting members 5, and the second limiting members 5 are in the shape of long plates. The two second limiting members 5 are located on opposite sides of the sliding member 2. There are four sets of bolt assemblies 6, and each second limiting member 5 is connected to the support member 1 by two sets of bolt assemblies 6.

[0032] In this embodiment, the support member 1 has a hollow structure. The sliding member 2, the first limiting member 3, the elastic member (i.e., the tension spring 4), and the connecting member 7 are located inside the support member 1. The support member 1 is provided with a guide groove 111, and the sliding member 2 is slidably engaged with the guide groove 111. Specifically, as shown... Figure 1As shown, the support member 1 includes a support frame 11 and two support plates 12. One end of each support plate 12 is fixed to the same side of the support frame 11 along its axial direction. The other ends of the two support plates 12 extend away from the support frame 11 along the sliding direction of the sliding member, and are parallel to each other, with a gap between the two support plates 12. Specifically, one end of each support plate 12 is bent, making them approximately L-shaped, and one end of each support plate 12 extends in opposite directions on the same side of the support frame 11 along its axial direction. A first limiting member 3 is fastened between the other ends of the two support plates 12. A second limiting member 5 is connected to the support frame 11 by bolt assemblies 6. Specifically, four sets of bolt assemblies 6 are approximately located at the four corners of the support frame 11, and two second limiting members 5 are distributed on both sides of the support plate 12 in the thickness direction, with each second limiting member 5 extending along the width direction of the support plate 12. This structural design of the support member 1 makes the entire support member 1 structure relatively compact and easy to assemble.

[0033] like Figure 1 As shown, the sliding member 2 includes a sliding body 21 and an auxiliary member 22. The sliding body 21 is slidably fitted between the support frame 11 and / or the two support plates 12. The auxiliary member 22 is disposed on the sliding body 21 and abuts against the second limiting member 5 in its initial position to limit the initial position of the sliding member 2. Specifically, the sliding body 21 is formed by folding the same plate in half, and the fold line extends along the sliding direction of the sliding member 2. The aforementioned elongated hole 211 is provided in the sliding body 21. The support frame 11 has guide grooves 111 on two opposing inner surfaces in the width direction of the support plate 12. At least one end of the sliding body 21 slides in the guide groove 111 and can partially enter between the other sides of the two support plates 12. There are two auxiliary members 22, and the two auxiliary members 22 are fitted one-to-one with the two second limiting members 5. The two auxiliary components 22 are plate-shaped and L-shaped, with one side abutting against the sliding body 21 and the other side extending in a direction perpendicular to the sliding direction of the sliding component 2, and abutting against the second limiting component 5 in the initial position. The connecting component 7 is located between the two parts of the sliding body 21 and is connected to the sliding body 21 with the other side of the two auxiliary components 22 by fasteners 8. Each support plate 12 is provided with a cutout 121 to avoid at least one of the second limiting component 5, the auxiliary component 22, and the elastic component (i.e., the tension spring 4).

[0034] This invention also includes a mounting component (not shown in the figure). The support component 1 can be fixedly connected to the mounting component or rotatably connected to the mounting component. The rotation axis of the support component 1 is perpendicular to the sliding direction of the sliding component 2. The mounting component is installed on the fixed part of the switchgear, which is the frame of the switchgear. This design allows this invention to meet both linear and rotary operating conditions.

[0035] This utility model discloses an auxiliary device for opening and closing circuit breakers, which can be applied to switchgear such as circuit breakers, especially large-capacity circuit breakers. In this embodiment, the utility model is used as an example for application to a circuit breaker, and its working principle is explained in conjunction with a circuit breaker. In this case, the aforementioned moving part can be the operating mechanism of the circuit breaker, or it can be the transmission mechanism of the circuit breaker used to drive the moving contacts to open and close. In this embodiment, the moving part is exemplified by a transmission mechanism, which includes a crank arm (not shown in the figure) with a pin passing through an elongated hole 211. In other embodiments, the elongated hole 211 is provided on the transmission mechanism (e.g., the crank arm).

[0036] When the moving contact of the circuit breaker is in the open position, the sliding member 2 is in the initial position, and the tension spring 4 is in the pre-tension state, such as Figure 3 As shown; at this time, the pin on the crank arm is located at the end of the elongated hole 211 near the tension spring 4. When the circuit breaker starts to close, the transmission mechanism begins to drive the moving contact to move in the closing direction, and at the same time, the pin slides along the length of the elongated hole 211. When the initial stage of the circuit breaker closing ends, the moving contact just contacts the stationary contact, and at the same time, the pin slides to the end of the elongated hole 211 away from the tension spring 4. During this process, the sliding member 2 does not slide, the tension spring 4 does not participate in the transmission process, and the load is zero. As the transmission mechanism continues to move in the closing direction, the subsequent stage of the circuit breaker closing begins, realizing the overtravel of the moving contact, and at the same time, the sliding member 2 begins to slide under the drive of the transmission mechanism, pulling the tension spring 4 to store energy, as shown. Figure 4 As shown. Therefore, during the closing process of the moving contact, the tension spring 4 only participates in the transmission process in the later stage of closing, in order to accumulate capacity for opening.

[0037] When the circuit breaker initiates tripping, the transmission mechanism drives the moving contact to move in the tripping direction. Simultaneously, the tension spring 4 rapidly releases its stored energy, which slides quickly through the sliding member 2, causing the transmission mechanism to rapidly trip the moving contact. This is the first tripping stage. Afterward, in the second tripping stage, the transmission mechanism completes its idle stroke relative to the sliding member 2, and the tension spring 4 no longer provides energy for the second tripping stage.

[0038] Therefore, the energy of the tension spring 4 in this invention can be released during the most critical opening stage, effectively solving the cost increase problem caused by the increased strength requirements of the opening buffer and overall structure due to the increased energy of the opening spring in the original solution. Through this design, the opening speed is significantly improved, eliminating the need for additional energy from the contact spring used to maintain contact pressure, thereby reducing the strength requirements of the contact spring and significantly saving R&D costs. Furthermore, this invention only functions in the subsequent closing stage, having minimal impact on the closing speed, and achieving the desired effect without major modifications to the circuit breaker's transmission mechanism, further reducing R&D costs. More importantly, through the pre-tension design of the tension spring 4 and the function of limiting the action stage of the tension spring 4, this invention can concentrate energy for use in the initial opening stage (i.e., the first opening stage), thus not significantly increasing the energy requirements of the oil buffer.

[0039] When switching equipment increases closing energy to improve closing speed, excessively high closing energy may adversely affect the equipment's performance and lifespan. In this case, the opening and closing auxiliary device of this invention cleverly intervenes to offset some of the excess closing energy, thereby effectively balancing the energy difference between closing and opening processes. This ensures that the switching equipment can still achieve smooth and reliable opening operations while closing at high speed, thus optimizing the overall performance of the equipment and extending its service life.

[0040] This invention allows for flexible adjustment of the preload of the tension spring 4 by modifying the dimensions of its components, thereby precisely controlling the energy provided by the tension spring 4 during the opening and closing process to meet the characteristic requirements of different circuit breakers. Furthermore, without changing the dimensions, the preload of the tension spring 4 can also be adjusted by changing the position of the first limiting member 3 and / or the second limiting member 5 to match the energy and load required by the circuit breaker. This invention also allows for adjustment of the timing of the tension spring 4's energy intervention during the opening and closing stages by controlling the dimensions of the sliding member 2 and its elongated hole 211.

[0041] This utility model is an external device independent of the original circuit breaker (i.e., this utility model is installed outside the circuit breaker bulb), which facilitates replacement and maintenance. The entire device can be easily disassembled by simply loosening the fasteners on the mounting parts, making maintenance and replacement convenient.

[0042] In practical applications, multiple sets of the opening and closing auxiliary devices of this utility model can be combined and used, and multiple sets of opening and closing auxiliary devices can be set up in parallel to adapt to the energy requirements of different circuit breakers and realize support for a variety of circuit breakers.

[0043] The present invention provides a circuit breaker, which includes the opening and closing auxiliary device of the present invention as described above. The circuit breaker constitutes a switching device.

[0044] For details on the structure and working principle of the circuit breaker auxiliary device, please refer to the previous description; it will not be repeated here.

[0045] The opening and closing auxiliary device and circuit breaker of this utility model are identical to or can be implemented using existing technologies for the parts not covered herein.

[0046] The above embodiments are only used to further illustrate a circuit breaker and a switching auxiliary device of the present invention. However, the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A switching auxiliary device, used in switchgear, characterized in that: The device includes a support member, a sliding member, an elastic member, and a first limiting member. The sliding member is slidably connected to the support member and is linked to a moving part of the switchgear used to perform opening and closing, so that it is driven to slide by the moving part. The elastic member is disposed between the sliding member and the first limiting member along the sliding direction of the sliding member. The first limiting member is integrally formed or connected to the support member. In the initial stage of closing the switchgear, the sliding member is not stretched or does not further stretch the elastic member. In the subsequent stage of closing the switchgear, the sliding member slides and stretches the elastic member, allowing the elastic member to store energy. When the switchgear is opened, the elastic member releases the stored energy.

2. The circuit breaker auxiliary device according to claim 1, characterized in that: The sliding member and the moving component have a free travel, so that the sliding member does not slide during the initial stage of the switchgear closing.

3. The circuit breaker auxiliary device according to claim 2, characterized in that: The slider is provided with an elongated hole extending along its sliding direction, and the elongated hole is connected to the moving part by a pin.

4. The circuit breaker auxiliary device according to claim 1, characterized in that: The initial stage is the process of the moving contact of the switchgear moving from the starting position of the open state to contacting the stationary contact of the switchgear. The subsequent stage corresponds to the overtravel stage of the moving contact. The opening stage of the switchgear sequentially includes a first opening stage corresponding to the subsequent stage and a second opening stage corresponding to the initial stage. The elastic element completes the energy storage release in the first opening stage.

5. The circuit breaker auxiliary device according to claim 4, characterized in that: The elastic element is in a pre-stretched state in the initial stage; it also includes a second limiting element, which is disposed on the support element. Before the sliding element is driven by the moving contact or the driving mechanism, it abuts against the second limiting element to limit the initial position of the sliding element.

6. The circuit breaker auxiliary device according to claim 5, characterized in that: The first limiting member and / or the second limiting member are positionally adjustable on the support member along the sliding direction of the sliding member to adjust the preload of the elastic member.

7. The circuit breaker auxiliary device according to claim 6, characterized in that: One of the first and second limiting members is connected to the support member by a bolt assembly for adjustable position; the bolt assembly includes a bolt and a plurality of adjusting nuts, the bolt extends along the sliding direction of the sliding member and passes through the first or second limiting member, and the plurality of adjusting nuts are threaded to the bolt and distributed on both sides of the first or second limiting member in the sliding direction of the sliding member; the other of the first and second limiting members is integrally formed or fixedly connected to the support member.

8. The circuit breaker auxiliary device according to claim 5, characterized in that: The support member includes a support frame and two support plates. One end of each support plate is fixed to the same side of the support frame along its axial direction. The other ends of the two support plates extend away from the support frame along the sliding direction of the slider and are parallel to each other. There is a gap between the two support plates. The slider includes a sliding body and an auxiliary component. The sliding body is slidably fitted between the support frame and / or the two support plates. The auxiliary component is disposed on the sliding body and abuts against the second limiting component in its initial position. The second limiting member is connected to the support frame, and the support plate has a hollow opening to avoid at least one of the auxiliary member, elastic member, and second limiting member; the first limiting member is disposed between the other ends of the two support plates.

9. The circuit breaker auxiliary device according to claim 1, characterized in that: The elastic element is a tension spring, one end of which is connected to the first limiting element and the other end of which is connected to the sliding element; or, the other end of which is connected to a connecting element and the connecting element is connected to the sliding element.

10. The circuit breaker auxiliary device according to claim 1, characterized in that: It also includes a mounting component, wherein the support component is fixedly connected to the mounting component, or the support component is rotatably connected to the mounting component, and the rotation axis of the support component is perpendicular to the sliding direction of the slider; the mounting component is installed on the fixed part of the switchgear.

11. A circuit breaker, characterized in that: The circuit breaker constitutes the switching equipment, including the opening and closing auxiliary device as described in any one of claims 1-10.

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