Locking mechanism and circuit breaker

Abstract

This application belongs to the technical field of circuit breaker operating mechanisms, specifically relating to locking mechanisms and circuit breakers. The circuit breaker includes a fixed plate, a main shaft rotatably mounted on the fixed plate, and a rotating shaft suspension plate linked to the main shaft. The locking mechanism includes a locking member, a stop member, and an actuating part. The locking member is rotatably mounted on the fixed plate and has a locking groove. The stop member is located on the rotating shaft suspension plate and moves with it. The actuating part is located on the rotating shaft suspension plate and is spaced apart from the stop member. During the opening process, the actuating part impacts and drives the locking member to rotate, causing the locking groove to move and fit onto the outside of the stop member, engaging with the stop member to restrict the springback of the rotating shaft suspension plate and the main shaft. This application can effectively reduce the springback of the main shaft when the circuit breaker is opened, improve the stability and reliability of the operation process, and ensure the safety of equipment and personnel.

Description

Technical Field

[0001] This application belongs to the technical field of circuit breaker operating mechanisms, specifically relating to a locking mechanism and a circuit breaker. Background Technology

[0002] Circuit breakers are critical switching devices in power systems, primarily used to close, carry, and interrupt current under normal circuit conditions, and to quickly disconnect fault current under fault conditions to prevent the escalation of accidents and ensure the safe operation of the system. Their operating mechanisms typically consist of electromagnets, springs, and mechanical transmission components, enabling them to perform opening or closing actions in response to control signals.

[0003] However, during the tripping process, moving parts in the mechanism (such as the rotating shaft suspension) will impact the fixed stop structure, such as the limit shaft, at high speed, causing a rebound due to excessive impact force. This rebound can cause the electrical gap between the moving and stationary contacts, which has already been opened after tripping, to suddenly shrink. This may not only hinder the normal extinguishing of the arc and weaken the breaking capacity, but in severe cases, it may even cause the arc to reignite or cause a momentary abnormal power supply, posing a threat to the safety of equipment and personnel. Utility Model Content

[0004] The purpose of this application is to provide a locking mechanism and circuit breaker that can effectively reduce the springback of the main shaft when the circuit breaker is tripped, improve the stability and reliability of the operation process, and ensure the safety of equipment and personnel.

[0005] The first aspect of this application provides a locking mechanism for preventing the springback of the main shaft when a circuit breaker is tripped. The circuit breaker includes a fixed plate, a main shaft rotatably mounted on the fixed plate, and a rotating shaft suspension plate linked to the main shaft. The locking mechanism includes: a locking member rotatably mounted on the fixed plate, the locking member having a locking groove; a stop member disposed on the rotating shaft suspension plate and moving together with the rotating shaft suspension plate; and an actuating part disposed on the rotating shaft suspension plate and spaced apart from the stop member. During tripping, the actuating part impacts and drives the locking member to rotate, causing the locking groove to move and fit around the outside of the stop member, engaging with the stop member to restrict the springback of the rotating shaft suspension plate and the main shaft.

[0006] In one exemplary embodiment of this application, the rotation direction of the locking member after being struck by the actuating part is opposite to the rotation direction of the rotating shaft suspension plate during the opening process.

[0007] In one exemplary embodiment of this application, the axis of the stop member and the axis of the actuating part are located on the same side of the rotation axis of the locking member, and the rotation axis of the locking member, the axis of the stop member, and the axis of the actuating part are parallel to each other.

[0008] In one exemplary embodiment of this application, the distance from the rotation axis of the locking member to the axis of the stop member is a first distance, and the distance from the rotation axis of the locking member to the bottom of the locking groove is a second distance; the first distance and the second distance are equal.

[0009] In one exemplary embodiment of this application, the distance from the axis of the actuating part to the rotation axis of the locking member is a third distance, which is less than the first distance.

[0010] In one exemplary embodiment of this application, the locking member includes a main body, an impact part, and a fixed shaft; one end of the main body is rotatably connected to a fixed plate via the fixed shaft; the impact part extends from the side wall of the main body in a direction away from the fixed shaft, and the extension direction of the impact part forms a preset angle with the length direction of the main body; the locking groove is formed on the side wall of the main body away from the impact part, and the opening direction of the locking groove faces the movement trajectory side of the stop member.

[0011] In one exemplary embodiment of this application, the locking mechanism further includes an elastic element; one end of the elastic element is connected to the side of the main body away from the locking groove, and the other end is connected to a preset fixing point on the fixing plate; when the circuit is opened, the locking element is impacted and rotated by the actuating part, stretching or compressing the elastic element, so that the elastic element stores elastic potential energy; after the circuit is opened, the elastic element releases the elastic potential energy, driving the locking element to rotate in the opposite direction to reset, and causing the locking groove to disengage from the stop member.

[0012] In one exemplary embodiment of this application, the locking groove is an arc-shaped recess structure, and the depth of the arc-shaped recess is greater than the cross-sectional radius of the stop member.

[0013] In one exemplary embodiment of this application, the opening edge of the locking groove away from the rotation axis of the locking member is provided with a guide slope; the guide slope and the bottom of the arc-shaped recessed groove are provided with an angle.

[0014] A second aspect of this application provides a circuit breaker, comprising: a main shaft; a rotating shaft suspension plate fixedly connected to the main shaft; and a locking mechanism as described above; wherein the stop member and the actuating part are respectively fixed to one end of the rotating shaft suspension plate away from the main shaft, and during the tripping process, the stop member is engaged in the locking groove to limit the rebound of the rotating shaft suspension plate and the main shaft.

[0015] The locking mechanism and circuit breaker of this application have at least the following beneficial effects: The locking mechanism of this application includes a locking element, a stop element, and an actuator. The locking element is rotatably mounted on the fixed plate of the circuit breaker and has a locking groove formed on it. The stop element is located on the rotating shaft suspension of the circuit breaker and moves with the rotating shaft suspension. The actuator is located on the rotating shaft suspension and is spaced apart from the stop element. During the opening process, the actuator impacts and drives the locking element to rotate, causing the locking groove to move to a predetermined position and engage with the stop element, thereby limiting the rebound of the rotating shaft suspension and the main shaft. By driving the locking element to rotate through the impact of the actuator, the locking groove actively moves to the predetermined position and engages with the stop element, forming a reliable mechanical lock. This effectively reduces the rebound of the main shaft and the rotating shaft suspension after opening, ensuring the stability of the electrical clearance between the moving and stationary contacts, fundamentally reducing the risk of arc reignition or instantaneous energization caused by rebound, and significantly improving the breaking reliability and operational safety of the circuit breaker.

[0016] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0019] Figure 1 A schematic diagram of the locking member and the stop member snapping together according to an embodiment of this application is shown.

[0020] Figure 2 It shows Figure 1 An enlarged schematic diagram of the locking and stopping components engaging at point A.

[0021] Figure 3 A schematic diagram of the circuit breaker provided in the embodiment of this application in the closed state is shown.

[0022] Figure 4 A schematic diagram of the circuit breaker provided in an embodiment of this application is shown.

[0023] Figure 5 This paper shows an exploded structural diagram of the fixing plate and spindle provided in an embodiment of this application.

[0024] Explanation of reference numerals in the attached figures: 10. Circuit breaker; 100. Locking mechanism; 110. Locking element; 111. Locking groove; 112. Main body; 113. Impact part; 120. Stopping element; 130. Actuating part; 140. Fixed shaft; 150. Elastic element; 160. Pin; 170. Guide slope; 200. Fixed plate; 300. Main shaft; 400. Rotating shaft suspension plate; 500. Limiting shaft; Q1. First direction; Q2. Second direction; O1. Shaft center of the stopping element; O2. Shaft center of the actuating part; O3. Shaft center of the locking element; d1. First distance; d2. Second distance; d3. Third distance. Detailed Implementation

[0025] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0026] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0027] In this application, unless otherwise expressly specified and limited, the terms "assembly," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0029] See Figures 1 to 3As shown, this application embodiment provides a locking mechanism 100, which is applied to a circuit breaker 10 to solve the problem of the main shaft 300 rebounding due to excessive impact force during tripping. The circuit breaker 10 includes a fixed plate 200, a main shaft 300 rotatably mounted on the fixed plate 200, and a shaft suspension plate 400 fixedly linked with the main shaft 300 and rotating synchronously with it.

[0030] Among them, see Figure 1 and Figure 2 As shown, the locking mechanism 100 may include a locking member 110, a stop member 120, and an actuating part 130. The locking member 110 is rotatably mounted on the fixed plate 200 via a fixed shaft 140, and a specific locking groove 111 is machined or formed on the locking member 110. The stop member 120 and the actuating part 130 are both fixedly mounted on the rotating shaft suspension plate 400, and the two are spatially spaced apart. To ensure that the locking member 110 and the rotating shaft suspension plate 400 do not interfere with each other during their respective movements, a certain movement gap is provided between the locking member 110 and the rotating shaft suspension plate 400.

[0031] from Figures 3 to 1 In the circuit breaker 10, when the circuit breaker 10 performs a tripping operation, the main shaft 300 drives the rotating shaft suspension 400 to rotate around its axis. The actuator 130, fixed on the rotating shaft suspension 400, moves in an arc along with it, during which the actuator 130 applies an impact load to the locking member 110. This impact force is converted into torque, causing the locking member 110 to produce an angular displacement around its fixed axis 140. This causes the locking groove 111 on the locking member 110 to move along a predetermined trajectory, and its movement path intersects with the movement trajectory of the stop member 120 in space. When the rotating shaft suspension 400 rotates to the tripping limit position, the locking groove 111 just completes the circumferential coverage of the stop member 120, forming a geometric constraint, such as... Figure 2 As shown.

[0032] This enclosed mechanical locking system creates a closed kinematic pair between the rotating shaft suspension plate 400 and the locking member 110, forming a unidirectional motion constraint. When the rotating shaft suspension plate 400 contacts the limiting shaft 500 and tends to rebound due to inertia or elastic potential energy, the constraint of the locking groove 111 on the stop member 120 can effectively reduce the reverse movement of the rotating shaft suspension plate 400, ensuring the structural stability of the open position, thereby reducing changes in electrical clearance caused by rebound.

[0033] In some embodiments, the stop 120 can be a stop pin, and the actuating part 130 can be a driving rod. The specific implementations of the stop 120 and the actuating part 130 are not limited to the stop pin and driving rod described above. The stop 120 can also be other rigid components such as rollers, protrusions, and wedges, as long as it has a working surface that can effectively engage with the locking groove 111. For example, using a roller structure can reduce friction with the locking groove 111, making the engagement smoother. The actuating part 130 can also be other types of driving components such as cams, rocker arms, and wedges. A cam mechanism can achieve smoother driving of the locking part 110 through its specific profile curve; a rocker arm structure can provide different torque characteristics through oscillating motion; and a wedge can convert the rotational motion of the pivot plate 400 into linear thrust to drive the locking part 110. These alternative structures can all achieve the basic function of impact driving.

[0034] It should be noted that the stop 120 and the actuating part 130 can be integrally molded with the rotating shaft suspension plate 400 using the same material. This integral structure has the advantages of high structural strength and simple assembly.

[0035] Furthermore, the stop 120, the actuating part 130, and the pivot suspension plate 400 can also be manufactured separately and then assembled. In this case, the stop 120 and the actuating part 130 can be fixed to the pivot suspension plate 400 by mechanical connection methods such as threaded connection, riveting, welding, or interference fit. The separate structure allows for the selection of the most suitable materials for different components. For example, the stop 120 can be made of wear-resistant steel, while the pivot suspension plate 400 can be made of cast material. It also facilitates the replacement and maintenance of individual components.

[0036] In some embodiments, see Figure 3 As shown, the rotation direction of the rotating shaft suspension plate 400 around the axis of the main shaft 300 during the tripping process is defined as the first direction Q1 (e.g., clockwise). When the actuating part 130 impacts the locking member 110, the rotation direction of the locking member 110 around its own fixed axis 140 after the impact is designed as the second direction Q2 (e.g., counterclockwise). The first direction Q1 is opposite to the second direction Q2. This reverse rotation design makes the movement trajectory of the locking groove 111 and the movement trajectory of the stop member 120 move in opposite directions, greatly optimizing the timing and efficiency of the engagement, and ensuring that the locking groove 111 can meet and capture the stop member 120 through the most direct path. In addition to the reverse rotation method, effective engagement under the same direction rotation can also be achieved by reasonably designing the opening direction and position of the locking groove 111.

[0037] In some embodiments, see Figure 2As shown, the axis O1 of the stop 120 and the axis O2 of the actuator 130 are both located on the same side of the rotation axis O3 of the locking member 110. Furthermore, the rotation axis O3 of the locking member 110, the axis O1 of the stop 120, and the axis O2 of the actuator 130 are parallel to each other. This arrangement, by placing the stop 120 and the actuator 130 on the same side of the rotation axis O3 of the locking member 110 and maintaining the parallelism of the three axes, creates a lever arm relationship between the impact driving force of the actuator 130 and the locking force of the locking groove 111. This not only significantly improves the torque transmission efficiency but also ensures that all forces are transmitted in the same plane, reducing additional bending moments and motion interference caused by spatial position deviations. Therefore, while achieving fast and precise locking, it effectively enhances the stability and reliability of the mechanism's operation.

[0038] In some embodiments, see Figure 2 As shown, the distance from the rotation axis O3 of the locking member 110 to the axis O1 of the stop member 120 is defined as the first distance d1, and the distance from the rotation axis O3 of the locking member 110 to the farthest point of the arc-shaped groove bottom of the locking groove 111 is defined as the second distance d2. The design ensures that the first distance d1 and the second distance d2 are equal. When the locking groove 111 rotates to the engaging position, this dimensional relationship ensures that the curved surface of the groove bottom of the locking groove 111 and the outer peripheral surface of the stop member 120 achieve maximum contact area. This surface contact form allows for uniform dispersion of impact force and reduces stress concentration during circuit breaker rebound, thereby significantly improving the reliability of the locking mechanism and its lifespan.

[0039] It should be noted that in some other embodiments, there may be a reasonable tolerance between these two distances.

[0040] In some embodiments, see Figure 2 As shown, the distance from the axis O2 of the actuator 130 to the rotation axis O3 of the locking member 110 is defined as the third distance d3. The design makes the third distance d3 smaller than the first distance d1. This means that the impact point of the actuator 130 is closer to the rotation fulcrum of the locking member 110 than the engagement point of the stop member 120. According to the lever principle, this design allows the actuator 130 to generate a sufficiently large rotational torque on the locking member 110 with a smaller impact force and a shorter lever arm, thereby driving the locking groove 111 (with a longer lever arm) at its end to rotate quickly and forcefully to the engagement position, improving the response speed and action certainty of the mechanism.

[0041] It should be noted that, in addition to this lever arm design, torque transmission can also be optimized by adding counterweights and other methods.

[0042] In some embodiments, see Figure 2As shown, the stop 120 and the actuating part 130 are arranged at a certain angle along the circumference on the rotating shaft suspension plate 400. This circumferential misalignment design ensures the timing separation of the two key actions. The actuating part 130 first impacts and drives the locking part 110 to rotate. After the locking groove 111 moves to the predetermined position, the stop 120 then moves to that position and is fitted by the locking groove 111. This not only reduces motion interference but also, by optimizing the action sequence, buys time for the locking part 110 to rotate fully, thereby improving the reliability and accuracy of the entire locking process.

[0043] In some embodiments, see Figure 2 As shown, the locking member 110 is a mechanical component that may include a main body 112, an impact portion 113 extending from the side wall of the main body 112 toward the pivot suspension 400, and a fixed shaft 140 for connection with the fixed plate 200. The extension direction of the impact portion 113 forms a predetermined angle with the length direction of the main body 112. This structure allows the impact portion 113 to more effectively absorb the impact force from the actuating portion 130. A locking groove 111 is formed on the side wall of the main body 112 away from the impact portion 113, and its opening direction is set toward the movement trajectory of the stop member 120 so that the stop member 120 can be smoothly engaged.

[0044] For example, the impact portion 113 extends vertically from the side wall of the main body portion 112, and its extension direction forms a 90-degree angle with the length direction of the main body portion 112. This vertical structure can effectively convert the impact force of the actuating portion 130 into a rotational torque that drives the locking member 110 to rotate, reducing the force decomposition loss caused by the tilt angle, thereby ensuring the maximum efficiency of impact force transmission, and enhancing the structural stability and deformation resistance of the locking member 110 under high-speed impact.

[0045] It should be noted that, apart from the hook-type structure with vertical impact part 113 in the aforementioned embodiments, the locking member 110 can achieve the same function by adopting other equivalent mechanical structure forms.

[0046] For example, the locking element 110 is designed as a rigid swing arm that swings about a fixed axis 140. A locking groove 111 is provided at one end of the swing arm, while the other end or the middle of the swing arm has a wide force-bearing surface to absorb impacts.

[0047] In some embodiments, see Figure 2As shown, the locking mechanism 100 may further include an elastic element 150. The elastic element 150 may be a tension spring or a torsion spring. One end of the elastic element 150 is connected to the side of the main body 112 of the locking member 110 away from the locking groove 111, and the other end is connected to a preset fixing point on the fixing plate 200; for example, the fixing point may be a pin 160 fixedly mounted on the fixing plate 200. This pin 160 connection method is simple and reliable, and facilitates adjustment of the initial preload of the elastic element 150 during assembly.

[0048] The working process of the elastic element 150 is as follows: when the circuit is opened, the locking element 110 is impacted and rotates, which stretches (or compresses) the elastic element 150, allowing it to store elastic potential energy. When the opening action is completed and the mechanism comes to a standstill, the reset torque of this elastic potential energy acting on the locking element 110 always exists. It is precisely by relying on this continuously existing elastic potential energy that the locking element 110 can overcome the static friction and mechanical resistance between the locking groove 111 and the stop element 120, drive itself to rotate in the opposite direction, and make the locking groove 111 automatically disengage from the stop element 120, realizing autonomous reset before the closing operation begins, thus ensuring that the mechanism is always in a standby state.

[0049] In some embodiments, the locking groove 111 is designed as an arc-shaped notch. The depth of the arc-shaped notch is set to be greater than the cross-sectional radius of the stop 120 (such as a cylindrical stop pin). This depth design ensures that the stop 120 has sufficient containment depth after being engaged in the locking groove 111, preventing it from dislodging from the groove when subjected to springback impact, thus enhancing the stability of the locking.

[0050] It should be noted that, in addition to the arc-shaped notch structure, the locking groove 111 can also adopt other shapes. For example, V-shaped locking groove 111, polygonal locking groove 111, and other shapes.

[0051] In some embodiments, see Figure 2 As shown, a guide slope 170 is machined at the opening edge of the locking groove 111 away from the rotation axis of the locking member 110. This guide slope 170 forms an inclined angle α with the bottom of the arc-shaped recess, which can be between 15° and 45°. During the reset rotation of the locking member 110, this guide slope 170 guides the stop member 120 to smoothly slide out of the locking groove 111 along the slope, greatly reducing friction and jamming during disengagement, ensuring smooth reset, and reducing component wear.

[0052] It should be noted that the specific angle of the guide ramp 170 can also be adjusted as needed.

[0053] The working principle of this application is as follows: Figure 3As shown, the product is in the open state (initial state). Under the action of the elastic member 150, the locking member 110 disengages from the stop member 120, and the impact rod on the locking member 110 contacts the drive rod. Figure 1 and Figure 2 As shown, when the circuit breaker 10 performs a tripping operation, the actuating part 130 impacts the impact part 113 on the locking part 110 to make it rotate, and the locking groove 111 moves accordingly and is sleeved on the stop part 120 to form a mechanical lock, thereby effectively preventing the main shaft 300 from springing back.

[0054] See Figure 4 and Figure 5 As shown, this embodiment also provides a circuit breaker 10 including the aforementioned locking mechanism 100. The circuit breaker 10 includes a main shaft 300, a rotating shaft suspension 400 fixedly connected to the main shaft 300, and the aforementioned locking mechanism 100. The stop 120 and actuating part 130 of the locking mechanism 100 are respectively fixed to one end of the rotating shaft suspension 400 away from the main shaft 300. During the tripping process of the circuit breaker 10, through the aforementioned series of actions of impact, rotation, and locking, the stop 120 is reliably locked into the locking groove 111, thereby effectively limiting the rebound of the rotating shaft suspension 400 and the main shaft 300, significantly improving the tripping reliability and electrical safety performance of the circuit breaker 10.

[0055] In the description of this specification, references to terms such as "some embodiments," "exemplarily," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0056] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application. Therefore, any changes or modifications made in accordance with the claims and description of this application should fall within the scope of this patent application.

Claims

1. A locking mechanism for preventing the main shaft of a circuit breaker from springing back when the circuit breaker trips, the circuit breaker comprising a fixed plate, a main shaft rotatably mounted on the fixed plate, and a rotating shaft suspension plate linked to the main shaft; characterized in that, The locking mechanism includes: A locking member is rotatably mounted on the fixed plate, and a locking groove is formed on the locking member; A stop is provided on the pivot suspension plate and moves together with the pivot suspension plate; An actuator is provided on the rotating shaft suspension plate and is spaced apart from the stop member; During the opening process, the actuating part impacts and drives the locking member to rotate, causing the locking groove to move and be sleeved on the outside of the stop member to engage with the stop member, thereby restricting the springback of the rotating shaft suspension plate and the main shaft.

2. The locking mechanism according to claim 1, characterized in that, The direction of rotation of the locking member after being struck by the actuating part is opposite to the direction of rotation of the rotating shaft suspension plate during the opening process.

3. The locking mechanism according to claim 2, characterized in that, The axis of the stop and the axis of the actuation part are located on the same side of the rotation axis of the locking part, and the rotation axis of the locking part, the axis of the stop, and the axis of the actuation part are parallel to each other.

4. The locking mechanism according to claim 3, characterized in that, The distance from the rotation axis of the locking member to the axis of the stop member is a first distance, and the distance from the rotation axis of the locking member to the bottom of the locking groove is a second distance; the first distance and the second distance are equal.

5. The locking mechanism according to claim 4, characterized in that, The distance from the axis of the actuating part to the rotation axis of the locking member is a third distance, which is less than the first distance.

6. The locking mechanism according to claim 1, characterized in that, The locking member includes a main body, an impact part, and a fixed shaft; one end of the main body is rotatably connected to a fixed plate via the fixed shaft; the impact part extends from the side wall of the main body in a direction away from the fixed shaft, and the extension direction of the impact part forms a preset angle with the length direction of the main body; the locking groove is formed on the side wall of the main body away from the impact part, and the opening direction of the locking groove faces the movement trajectory side of the stop member.

7. The locking mechanism according to claim 6, characterized in that, The locking mechanism also includes an elastic element; one end of the elastic element is connected to the side of the main body away from the locking groove, and the other end is connected to a preset fixing point on the fixing plate; When the circuit is opened, the locking member is impacted and rotated by the actuating part, which stretches or compresses the elastic member, causing the elastic member to store elastic potential energy. After the circuit breaker is opened, the elastic element releases its elastic potential energy, driving the locking element to rotate in the opposite direction to reset, and causing the locking groove to disengage from the stop element.

8. The locking mechanism according to claim 6, characterized in that, The locking groove is an arc-shaped recess, and the depth of the arc-shaped recess is greater than the cross-sectional radius of the stop.

9. The locking mechanism according to claim 8, characterized in that, The locking groove has a guide slope at its opening edge away from the rotation axis of the locking member; the guide slope has an angle with the bottom of the arc-shaped groove.

10. A circuit breaker, characterized in that, include: spindle; The rotating shaft suspension plate is fixedly connected to the main shaft; as well as The locking mechanism according to any one of claims 1 to 9; the stop and the actuating part are respectively fixed to the end of the rotating shaft suspension away from the main shaft, and during the opening process, the stop is engaged in the locking groove to restrict the rebound of the rotating shaft suspension and the main shaft.

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