Electromagnetic force operating mechanism and circuit breaker

Abstract

The application provides an electromagnetic force operating mechanism and a circuit breaker, wherein the electromagnetic force operating mechanism comprises a fixed base, a magnetic force component arranged on the fixed base, a coil component movably arranged in the magnetic force component, an operating member, a first end of the operating member being fixedly connected with the coil component, a second end of the operating member being located outside the fixed base, the coil component driving the operating member to move, the operating member having an open position in which the second end of the operating member is close to the fixed base and a closed position in which the second end of the operating member is away from the fixed base, and a buffer spring ring abutting between the second end of the operating member and the fixed base, the buffer spring ring applying an elastic force to the second end of the operating member in a direction away from the fixed base. The technical scheme of the application effectively solves the problem in the related art that the damping buffer pad cannot completely buffer the impact force when the opening ends.

Description

Technical Field

[0001] This invention relates to the field of switching devices for power systems, and more specifically, to an electromagnetic force operating mechanism and a circuit breaker. Background Technology

[0002] For circuit breakers, the tripping action is generally divided into three stages: the initial stage is to accelerate to reach the speed required for tripping as soon as possible, the middle stage is to maintain the speed, and the final stage is to decelerate to reduce the final tripping speed and reduce the impact vibration when the tripping is terminated.

[0003] Conventional electromagnetic force mechanisms utilize a current-carrying coil moving within a parallel magnetic field. At the end of the opening motion, the coil directly impacts the opening holding surface of the mechanism's mounting base. Although the current decreases and the speed drops at the end, significant impact and vibration still occur. Current solutions often involve installing a damping buffer pad on the mounting base, utilizing the elasticity of the plastic to absorb the impact. However, at the end of the opening motion, due to the material properties of the plastic, the energy absorbed is limited, failing to completely buffer the impact, leading to buffering failure. Summary of the Invention

[0004] The main objective of this invention is to provide an electromagnetic force operating mechanism and circuit breaker to solve the problem in the related art that the damping buffer cannot completely buffer the impact force when the circuit breaker terminates at the end of the tripping phase.

[0005] To achieve the above objectives, according to one aspect of the present invention, an electromagnetic force operating mechanism is provided, comprising: a fixed base; a magnetic component disposed on the fixed base; a coil component movably disposed within the magnetic component; an operating member, a first end of which is fixedly connected to the coil component, a second end of which is located outside the fixed base, the coil component driving the operating member to move, the operating member having an open position where the second end of the operating member approaches the fixed base and an closed position where the second end of the operating member moves away from the fixed base; and a buffer spring coil abutting between the second end of the operating member and the fixed base, the buffer spring coil applying a spring force to the second end of the operating member in a direction away from the fixed base.

[0006] Furthermore, the buffer spring coil includes a plurality of interconnected first spring rods, each first spring rod being inclined to or parallel to the movement direction of the coil component, and the plurality of first spring rods being spaced apart around the movement direction of the coil component.

[0007] Furthermore, when each first spring rod is tilted in the direction of movement of the coil component, the buffer spring coil also includes a plurality of second spring rods, which are spaced apart around the direction of movement of the coil component, and each second spring rod is connected to at least one first spring rod through a hinge structure.

[0008] Furthermore, the hinge structure includes a hinge hole, a hinge shaft passing through the hinge hole, and a damping sleeve sleeved outside the hinge shaft.

[0009] Furthermore, each first spring rod has a first curved surface on its end face facing the second end of the actuator, and a second curved surface on its end face facing the fixed seat.

[0010] Furthermore, the operating component includes an operating plate located outside the fixed base and a connecting rod connecting the operating plate and the coil component. There are two connecting rods and two buffer spring rings. The two connecting rods are connected between the operating plate and the coil component, and each buffer spring ring is sleeved on the outside of each connecting rod. Each connecting rod is provided with an adjusting component. The two ends of the buffer spring ring abut against the adjusting component and the operating plate, respectively. The adjusting component is movably set and can adjust the preload of the corresponding buffer spring ring.

[0011] Furthermore, the connecting rod is provided with external threads, and the adjusting component includes a threaded component connected to the external threads and a stop component clamped between the threaded component and the buffer spring ring.

[0012] Furthermore, the threaded component includes a plurality of nuts arranged sequentially along the axis of the connecting rod.

[0013] Furthermore, there are two adjusting components, each equipped with a pressure sensor. The pressure sensor is used to detect the preload of the corresponding buffer spring coil. The electromagnetic force operating mechanism also includes a controller connected to the signal of each pressure sensor.

[0014] According to another aspect of the present invention, a circuit breaker is provided, including a support base, an arc-extinguishing chamber disposed on the support base, and an electromagnetic force operating mechanism. The electromagnetic force operating mechanism is the aforementioned electromagnetic force operating mechanism. The operating member is hinged to the moving end of the arc-extinguishing chamber. When the operating member moves, it can drive the moving end to move. When the operating member is in the open position, the moving end performs an open operation. When the operating member is in the closed position, the moving end performs a close operation.

[0015] According to the technical solution of this invention, the electromagnetic operating mechanism includes: a fixed base, a magnetic component, a coil component, an operating member, and a buffer spring coil. The magnetic component is disposed on the fixed base. The coil component is movably disposed within the magnetic component. A first end of the operating member is fixedly connected to the coil component, and a second end of the operating member is located outside the fixed base. The coil component drives the operating member to move. The operating member has an open position where the second end of the operating member approaches the fixed base and an closed position where the second end of the operating member moves away from the fixed base. The buffer spring coil abuts between the second end of the operating member and the fixed base, and the buffer spring coil applies a spring force to the second end of the operating member away from the fixed base. When the coil component drives the operating member to move, during the process of switching the operating member from the closed position to the open position, the buffer spring coil applies a spring force away from the fixed seat to the second end of the operating member. This results in a buffer stroke of the buffer spring coil being greater than that of the damping buffer pad in related technologies, and the damping force applied by the buffer spring coil to the operating member is also greater than that of the damping buffer pad. At the end of the opening phase, when the operating member reaches the open position, the buffer spring coil can completely buffer the impact force received, causing the opening movement speed to stop. At the same time, the compressed state of the buffer spring coil under the impact force pre-stores energy for the process of switching the operating member from the open position to the closed position. While suppressing the impact force generated by the opening, it is also beneficial for the movement to the closed position the next time. Therefore, the technical solution of this application effectively solves the problem in related technologies where the damping buffer pad cannot completely buffer the impact force received at the end of the opening phase. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 A cross-sectional schematic diagram of an embodiment of the electromagnetic force operating mechanism according to the present invention is shown;

[0018] Figure 2 It shows Figure 1 A front view schematic diagram of the state of the buffer spring coil when the operating component of the electromagnetic force operating mechanism is in the closed position;

[0019] Figure 3 It shows Figure 2 A top view of the buffer spring coil;

[0020] Figure 4 It shows Figure 1 A front view schematic diagram of the state of the buffer spring coil when the operating component of the electromagnetic force operating mechanism is in the open position;

[0021] Figure 5 A cross-sectional schematic diagram of an embodiment of a circuit breaker according to the present invention is shown.

[0022] The above figures include the following reference numerals:

[0023] 1. Top cover plate; 2. Fixing plate; 3. Upper coil frame; 4. Frame fixing plate; 5. Bottom plate; 6. Middle phase permanent magnet; 7. Lower coil frame; 8. Coil; 9. Side phase permanent magnet; 10. Connecting rod; 11. Buffer spring ring; 111. First spring rod; 112. Second spring rod; 113. Hinge structure; 12. Operating plate; 13. Stop; 14. Adjusting component;

[0024] 20. Fixed base; 30. Magnetic component; 40. Operating component; 61. Support base; 62. Arc extinguishing chamber; 621. Moving end. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0028] like Figures 1 to 5As shown, this application provides an electromagnetic force operating mechanism. An embodiment of the electromagnetic force operating mechanism includes: a fixed base 20, a magnetic component 30, a coil component, an operating member 40, and a buffer spring coil 11. The magnetic component 30 is disposed on the fixed base 20. The coil component is movably disposed within the magnetic component 30. A first end of the operating member 40 is fixedly connected to the coil component, and a second end of the operating member 40 is located outside the fixed base 20. The coil component drives the operating member 40 to move. The operating member 40 has an open position where the second end of the operating member 40 approaches the fixed base 20, and an closed position where the second end of the operating member 40 moves away from the fixed base 20. The buffer spring coil 11 abuts between the second end of the operating member 40 and the fixed base 20, and the buffer spring coil 11 applies a spring force to the second end of the operating member 40 in a direction away from the fixed base 20.

[0029] Using the technical solution of this embodiment, the electromagnetic force operating mechanism includes: a fixed base 20, a magnetic component 30, a coil component, an operating component 40, and a buffer spring coil 11. When the coil component drives the operating component 40 to move, during the process of the operating component 40 switching from the closed position to the open position, the buffer spring coil 11 applies a spring force away from the fixed base 20 to the second end of the operating component 40, making the buffer stroke of the buffer spring coil 11 greater than that of the damping buffer pad in the related art, and the damping force applied by the buffer spring coil 11 to the operating component 40 is also greater than that of the damping buffer pad. When the opening segment ends, that is, when the operating component 40 reaches the open position, the buffer spring coil 11 can completely buffer the impact force received, so that the opening movement speed stops. Simultaneously, the compressed state of the buffer spring coil 11 under impact force pre-stores energy during the switching of the operating member 40 from the open position to the closed position. This suppresses the impact force generated during opening and facilitates the next switching to the closed position. Therefore, the technical solution of this embodiment effectively solves the problem in related technologies where the damping buffer pad cannot completely buffer the impact force at the end of the opening phase. This buffer spring coil, combined with the magnetic component 30, further facilitates the opening and closing actions of the magnetic component 30. It can thoroughly buffer the impact force at the end of the opening phase and provide power during closing, reducing the output force requirement of the magnetic component and increasing the initial speed of the next movement.

[0030] like Figures 1 to 4 As shown, in order to ensure that the buffer stroke of the buffer spring coil 11 is greater than that of the damping buffer pad in the related art, the buffer spring coil 11 includes a plurality of connected first spring rods 111, each first spring rod 111 is inclined to the moving direction of the coil component, and the plurality of first spring rods 111 are spaced apart around the moving direction of the coil component.

[0031] In other embodiments, each first spring bar 111 is parallel to the direction of movement of the coil component.

[0032] like Figures 1 to 4As shown, when each first spring rod 111 is inclined in the direction of movement of the coil component. In order to ensure that the buffer spring coil 11 forms a stable and reliable coil structure, the buffer spring coil 11 also includes a plurality of second spring rods 112, which are spaced apart around the direction of movement of the coil component, and each second spring rod 112 is connected to at least one first spring rod 111 through a hinge structure 113.

[0033] like Figures 1 to 4 As shown, the hinge structure 113 includes a hinge hole, a hinge shaft passing through the hinge hole, and a damping sleeve sleeved outside the hinge shaft. The damping sleeve can reduce wear between the hinge shaft and the second spring rod and the first spring rod 111.

[0034] In this embodiment, each first spring rod 111 and each second spring rod 112 are made of spring steel, possessing a certain degree of stiffness and elasticity. The hinge pin is a steel pin, and the damping sleeve is made of composite plastic. The damping sleeve encloses the hinge pin, providing support, while the damping sleeve provides damping force. When no force is applied, the spring steel bar maintains its height due to its own stiffness. When subjected to external force, the spring steel bar is compressed, and simultaneously, the spring steel bar rotates around the hinge pin, compressing the entire buffer spring coil 11 and storing some force.

[0035] like Figures 1 to 4 As shown, each first spring rod 111 has a first curved surface on its end face facing the second end of the operating member 40, and each first spring rod 111 has a second curved surface on its end face facing the fixed base 20. This reduces the contact area between the first curved surface and the end face of the second end of the operating member 40, and the friction area between the second curved surface and the end face of the fixed base 20, thereby improving service life.

[0036] like Figures 1 to 4 As shown, the operating component 40 includes an operating plate 12 located outside the fixed base 20 and a connecting rod 10 connecting the operating plate 12 and the coil component. There are two connecting rods 10 and two buffer spring coils 11. The two connecting rods 10 connect the operating plate 12 and the coil component, and each buffer spring coil 11 is fitted onto the outside of each connecting rod 10. The two buffer spring coils 11 can effectively distribute the impact force applied by the operating plate 12, making the buffering process of the buffer spring coils 11 smoother.

[0037] like Figures 1 to 4 As shown, each connecting rod 10 is equipped with an adjusting element 14. The two ends of the buffer spring coil 11 abut against the adjusting element 14 and the operating plate 12, respectively. The adjusting element 14 is movably set and can adjust the preload of the corresponding buffer spring coil 11. In this way, the intervention time and stroke of the buffer spring coil 11 during the switching of the operating element 40 from the closed position to the open position can be changed, and the buffer force value of the opening can be adjusted to change the opening speed to adapt to various different circuit breakers.

[0038] The compression force of the aforementioned buffer spring coil 11 in its compressed state is adjustable, and the intervention position of the buffer spring coil 11 in which it plays a buffering role is adjustable.

[0039] like Figures 1 to 4 As shown, the connecting rod 10 is provided with an external thread, and the adjusting member 14 includes a threaded member that connects to the external thread and a stop member 13 sandwiched between the threaded member and the buffer spring ring 11. The threaded member facilitates connection with the external thread and facilitates adjustment of the compression amount of the buffer spring ring 11, thereby changing the pre-compression force value of the buffer spring ring 11.

[0040] In this embodiment, the fixed base is provided with a clearance hole for the threaded component, and the fixed base and the stopper engage. Thus, during the process of switching the operating member 40 from the closed position to the open position, the buffer spring coil 11 is subjected to a compressive impact force, the threaded component can be located in the clearance hole, and the fixed base and the stopper engage, so that the operating member 40 can reach the open position.

[0041] In this embodiment, the stop 13 is preferably a baffle plate. This ensures that the operating plate 12 is evenly subjected to the elastic force applied by the buffer spring coil 11.

[0042] like Figures 1 to 4 As shown, the threaded component includes multiple nuts arranged sequentially along the axis of the connecting rod 10. These multiple nuts facilitate adjustment of the compression of the buffer spring coil 11, and the extra nuts can lock the nut in contact with the stop 13, thus achieving a loosening effect.

[0043] like Figures 1 to 4 As shown, there are two adjusting components 14, each equipped with a pressure sensor. The pressure sensor detects the preload of the corresponding buffer spring coil 11. The electromagnetic actuation mechanism also includes a controller connected to each pressure sensor signal. Thus, the controller can obtain the preload of the buffer spring coil 11 detected by the pressure sensor in real time.

[0044] In this embodiment, the fixing base 20 includes a fixing plate 2, an upper cover plate 1 fixedly disposed above the fixing plate 2, and a lower base plate 5 fixedly disposed below the fixing plate 2.

[0045] like Figures 1 to 4As shown, the magnetic component 30 includes a side-phase permanent magnet 9 and a middle-phase permanent magnet 6 mounted on the fixed plate 2. The side-phase permanent magnet 9 and the middle-phase permanent magnet 6 form a parallel magnetic field. The coil component includes a frame fixing plate 4 movably mounted on the fixed plate 2, and an upper coil frame 3 and a lower coil frame 7 mounted on the frame fixing plate 4. The coil component also includes a coil 8 fixed between the upper coil frame 3 and the lower coil frame 7. The coil 8 has multiple turns. When the coil 8 is energized, the parallel magnetic field formed in the side-phase permanent magnet 9 and the middle-phase permanent magnet 6 causes the coil 8 to move up and down within the parallel magnetic field. It is held at the uppermost and lowermost ends by the magnetic field of the permanent magnets. The connecting rod 10 is fixedly connected to the upper coil frame 3 so that the operating component 40 moves with the coil 8. Both the side-phase permanent magnet 9 and the middle-phase permanent magnet 6 are permanent magnets.

[0046] When coil 8 moves downward to open the circuit, in the latter half of the stroke, since the insulation distance in the arc-extinguishing chamber of the circuit breaker has been established, the speed does not need to be high in the later stage, so as to reduce the impact at the end of the opening.

[0047] In this embodiment, a buffer spring coil 11 is added to the connecting rod, which can provide buffering at the end of the opening stage, reduce the opening speed, store some kinetic energy, release this energy when closing, and increase the initial speed when closing, which is beneficial to improving the closing speed.

[0048] This buffer spring ring 11 can also be replaced with hinge shafts of different damping coefficients or spring steel bars of different lengths to adjust the resistance and intervention time at the end of the tripping stage, thereby adjusting the tripping buffer and making it suitable for different types of circuit breakers.

[0049] This invention application also provides a circuit breaker, such as Figure 5 As shown, the embodiment of the circuit breaker includes a support base 61, an arc-extinguishing chamber 62 disposed on the support base 61, and an electromagnetic force operating mechanism. The electromagnetic force operating mechanism is the aforementioned electromagnetic force operating mechanism. The operating member 40 is hinged to the moving end 621 of the arc-extinguishing chamber 62. When the operating member 40 moves, it can drive the moving end 621 to move. When the operating member 40 is in the open position, the moving end 621 performs an open operation; when the operating member 40 is in the closed position, the moving end 621 performs a close operation. Because the aforementioned electromagnetic force operating mechanism can solve the problem in related technologies where the damping buffer cannot completely buffer the impact force received at the end of the open phase, the circuit breaker including this electromagnetic force operating mechanism can solve the same technical problem.

[0050] In this embodiment, the circuit breaker utilizes the damping and energy storage effect of the buffer spring coil to buffer and reduce speed in the latter part of the tripping phase, thus reducing impact vibration at the tripping end. Furthermore, by replacing the buffer spring coil with different damping coefficients and compression positions, it is possible to adapt to different circuit breaker requirements and buffer intervention times, satisfying the motion characteristics of the electromagnetic operating mechanism. The circuit breaker with the electromagnetic operating mechanism has a simple structure, compact size, controllable speed during operation, and high stability. It can perform phase-selective tripping and closing functions, has a large stroke, and strong adaptability. Moreover, the speed of the magnetic mechanism can be controlled by current to meet the needs of different circuit breakers.

[0051] The electromagnetic force operating mechanism utilizes the Lorentz force acting on a current-carrying conductor in a magnetic field to move it. When the electromagnetic force operating mechanism is in the closed position, the permanent magnet forms a closed loop, providing the closing holding force, without a mechanical tripping or locking system.

[0052] When the electromagnetic operating mechanism is in the open position, a reverse current flows through the coil. The Lorentz force generated by the coil is greater than the closing holding force, and the electromagnetic operating mechanism begins to open. In the open position, the closing holding force is provided by the closed circuit formed by the permanent magnet. Theoretically, the stroke is unlimited, making it suitable for circuit breakers with a large stroke.

[0053] When the circuit breaker is in the closed (open) position, no current flows through the excitation coil. The permanent magnet (arrow direction indicates magnetization direction) acts on the iron core, and no mechanical interlock is required to maintain the closed (open) position. When the energy storage capacitor discharges, the coil conductor carrying the excitation current is in the parallel magnetic field formed by the permanent magnet and is subjected to the Lorentz force. The iron core, together with the operating mechanism fixed on it, completes the opening (closing) operation.

[0054] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0055] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0056] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An electromagnetic force operating mechanism, characterized in that, include: The fixing base (20) includes a fixing plate (2), an upper cover plate (1) fixedly disposed above the fixing plate (2), and a lower base plate (5) fixedly disposed below the fixing plate (2). A magnetic component (30) is disposed on the fixed base (20); The coil component is movably disposed within the magnetic component (30); An operating component (40) has a first end fixedly connected to the coil component, and a second end located outside the fixed base (20). The coil component drives the operating component (40) to move. The operating component (40) has an open position where the second end of the operating component (40) is close to the fixed base (20) and an closed position where the second end of the operating component (40) is away from the fixed base (20). A buffer spring coil (11) abuts against the second end of the operating member (40) and the fixed base (20), and the buffer spring coil (11) applies a spring force to the second end of the operating member (40) in a direction away from the fixed base (20); the magnetic component (30) includes a side phase permanent magnet (9) and a middle phase permanent magnet (6) disposed on the fixed plate (2), and the side phase permanent magnet (9) and the middle phase permanent magnet (6) form a parallel magnetic field; The coil component includes a coil (8) with multiple turns wound on it. The coil (8) is movably disposed in the parallel magnetic field and moves up and down along the parallel magnetic field. When the coil (8) is located at both ends of the parallel magnetic field, it is maintained in position by the parallel magnetic field. The buffer spring coil (11) includes a plurality of connected first spring rods (111), each first spring rod (111) being inclined to or parallel to the moving direction of the coil component, and the plurality of first spring rods (111) being spaced apart around the moving direction of the coil component; When each of the first spring rods (111) is tilted in the direction of movement of the coil component, the buffer spring coil (11) also includes a plurality of second spring rods (112), the plurality of second spring rods (112) being spaced apart around the direction of movement of the coil component, and each second spring rod (112) being connected to at least one first spring rod (111) through a hinge structure (113); The hinge structure (113) includes a hinge hole, a hinge shaft passing through the hinge hole, and a damping sleeve sleeved outside the hinge shaft. Each of the first spring rod (111) and each of the second spring rods (112) is made of spring steel, the hinge pin is a steel pin, and the damping sleeve is made of composite plastic, the damping sleeve covering the hinge pin.

2. The electromagnetic force operating mechanism according to claim 1, characterized in that, Each of the first spring rods (111) has a first curved surface on its end face facing the second end of the operating member (40), and each of the first spring rods (111) has a second curved surface on its end face facing the fixed seat (20).

3. The electromagnetic force operating mechanism according to claim 1, characterized in that, The operating component (40) includes an operating plate (12) located outside the fixed base (20) and a connecting rod (10) connecting the operating plate (12) and the coil component. There are two connecting rods (10) and two buffer spring rings (11). The two connecting rods (10) are connected between the operating plate (12) and the coil component. Each buffer spring ring (11) is sleeved on the outside of each connecting rod (10). Each of the connecting rods (10) is provided with an adjusting member (14), and the two ends of the buffer spring ring (11) abut against the adjusting member (14) and the operating plate (12) respectively. The adjusting member (14) is movably provided and can adjust the preload of the corresponding buffer spring ring (11).

4. The electromagnetic force operating mechanism according to claim 3, characterized in that, The connecting rod (10) is provided with an external thread, and the adjusting member (14) includes a threaded member connected to the external thread and a stop (13) sandwiched between the threaded member and the buffer spring ring (11).

5. The electromagnetic force operating mechanism according to claim 4, characterized in that, The threaded component includes a plurality of nuts arranged sequentially along the axis of the connecting rod (10).

6. The electromagnetic force operating mechanism according to claim 3, characterized in that, There are two adjusting members (14), and each adjusting member (14) is provided with a pressure sensor. The pressure sensor is used to detect the magnitude of the preload of the corresponding buffer spring coil (11). The electromagnetic force operating mechanism also includes a controller that is connected to each pressure sensor signal.

7. A circuit breaker, comprising a support base (61), an arc-extinguishing chamber (62) disposed on the support base (61), and an electromagnetic force operating mechanism, characterized in that, The electromagnetic force operating mechanism is the electromagnetic force operating mechanism according to any one of claims 1 to 6. The operating member (40) is hinged to the moving end (621) of the arc extinguishing chamber (62). When the operating member (40) moves, it can drive the moving end (621) to move. When the operating member (40) is in the open position, the moving end (621) performs the open operation. When the operating member (40) is in the closed position, the moving end (621) performs the close operation.

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