Three-position operating mechanism and switchgear having the same

Abstract

The present application relates to a three-position operating mechanism and a switch device having the same. The three-position operating mechanism is mounted to a base and includes an output plate and two dial plates. The three-position operating mechanism also includes two limit pins. A first limit periphery of each dial plate abuts against an adjacent dial pin to lock the output plate in a first position; a second limit periphery of a first dial plate of the two dial plates extending from an end of the dial plate away from the rotational axis abuts against an adjacent limit pin to move the output plate to a second position and prevent the output plate from rotating in a second direction opposite to the first direction at the second position; and a second limit periphery of the second dial plate extending from an end of the dial plate away from the rotational axis abuts against an adjacent limit pin to move the output plate to a third position and prevent the output plate from rotating in the first direction at the third position.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment technology, and more particularly to a three-position operating mechanism and a switchgear having the same. Background Technology

[0002] With the miniaturization and integration of key electrical products in power systems, such as switchgear, in recent years, three-position operating mechanisms have been widely used in switchgear due to their small size, compact structure, and high degree of integration. These mechanisms can switch between three working positions: closed, isolated, and grounded, ensuring safe and stable electrical operations. However, in existing technologies, when the three-position operating mechanism moves to each position, additional locking and unlocking structures are typically required to lock or unlock it. This obviously results in a complex structure, a large number of required parts, and higher costs.

[0003] Therefore, there is a demand in this field for three-station operating mechanisms that are simple in structure, require fewer parts, and have lower costs. Summary of the Invention

[0004] The present invention aims to provide a three-station operating mechanism that can at least solve some of the above-mentioned problems.

[0005] The present invention also aims to provide a switching device that applies the above-described improved three-position operating mechanism.

[0006] According to one aspect of the present invention, a three-station operating mechanism is provided, which is mounted to a base and includes: an output plate rotatably connected to the base and having two pins located on both sides of its rotation axis; two dial plates rotatably connected to the base and distributed on both sides of the rotation axis, each dial plate having an opening for engaging a corresponding pin; the three-station operating mechanism further includes: two limiting pins disposed on the output plate and located on both sides of the rotation axis; wherein a first limiting periphery extending from the end of each dial plate near the rotation axis abuts against an adjacent pin, thereby locking the output plate in a first position; the first dial plate of the two dial plates is... The first dial is configured to rotate the output plate in a first direction when engaged with an adjacent pin, until a second limiting periphery extending from the end of its opening away from the axis of rotation abuts against an adjacent limiting pin, thereby moving the output plate to a second position and preventing the output plate from rotating in a second direction opposite to the first direction in the second position; the second dial of the two dials is configured to rotate the output plate in a second direction when engaged with an adjacent pin, until a second limiting periphery extending from the end of its opening away from the axis of rotation abuts against an adjacent limiting pin, thereby moving the output plate to a third position and preventing the output plate from rotating in the first direction in the third position.

[0007] Compared with the prior art, the three-station operating mechanism of the present invention, through the ingenious design of the positional relationship between the outer periphery of the dial plate and the dial pin and limit pin on the output plate, can realize the movement of the output plate between three positions and can limit the output plate in any of the positions. Compared with the prior art, it is greatly simplified by adding a complete set of locking and unlocking devices, and the number of required parts is greatly reduced, and the manufacturing cost is reduced accordingly.

[0008] Preferably, the rotation radius of the second limiting periphery of each of the dial plates is greater than the rotation radius of its first limiting periphery.

[0009] Preferably, the rotation radius of the pawl is greater than the rotation radius of the limit pin.

[0010] Preferably, the first dial plate rotates with a torque in a first direction and engages with an adjacent dial pin to drive the output plate to rotate in the first direction until the second limiting periphery of the first dial plate abuts against the adjacent limiting pin. The second limiting periphery of the first dial plate is configured to resist the rebound movement of the output plate in a second direction, wherein the torque exerted by the limiting pin on the first dial plate is zero or the torque in the first direction.

[0011] Preferably, the second dial plate rotates with a torque in a second direction and engages with an adjacent pin to drive the output plate to rotate in the second direction until the second limiting periphery of the second dial plate abuts against the adjacent limiting pin. The second limiting periphery of the second dial plate is configured to resist the rebound movement of the output plate in a first direction, wherein the torque exerted by the limiting pin on the second dial plate is zero or a torque in the second direction.

[0012] Preferably, the opening size of each of the dial plates is larger than the outer diameter of the adjacent dial pin.

[0013] Preferably, each of the pins is rotatably connected to the output plate.

[0014] The present invention also provides a switching device, the switching device comprising a base and the aforementioned three-position operating mechanism mounted on the base.

[0015] Preferably, the base is configured as two spaced-apart substrates, and the limiting post is used to connect the two substrates to keep the two substrates in a spaced-apart state.

[0016] Other features and advantages of the present invention will partly become apparent to those skilled in the art upon reading this application, and partly will be described in conjunction with the accompanying drawings in the detailed description below. Attached Figure Description

[0017] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings, wherein:

[0018] Figure 1 This is a three-dimensional schematic diagram of the three-station operating mechanism according to the present invention;

[0019] Figure 2 This is a front view of the three-station operating mechanism according to the present invention, wherein the three-station operating mechanism is in an isolated position;

[0020] Figure 3 This is a front view of the three-position operating mechanism according to the present invention, wherein the three-position operating mechanism is in a first orientation between moving from the isolation position to the closing position;

[0021] Figure 4 This is a front view of the three-position operating mechanism according to the present invention, wherein the three-position operating mechanism is in a second orientation between the isolation position and the closing position;

[0022] Figure 5 This is a front view of the three-position operating mechanism according to the present invention, wherein the three-position operating mechanism is in the closed position;

[0023] Figure 6 This is a front view of the three-station operating mechanism according to the present invention, wherein the three-station operating mechanism is in the grounded position.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1-Three-position operating mechanism; 11-Output component; 111-Output shaft; 112-Output plate; 113-Closing pin; 114-Grounding pin; 115-Closing limit pin; 116-Grounding limit pin; 117-Limiting slot; 12-Closing drive component; 121-Closing operating shaft; 122-Closing input plate; 123-Closing lever; 124-Closing opening; 125-First position of closing lever 123 Limiting perimeter; 126-Second limiting perimeter of closing lever 123; 13-Grounding drive component; 131-Grounding operation shaft; 132-Grounding input plate; 133-Grounding lever; 134-Grounding opening; 135-First limiting perimeter of grounding lever 133; 136-Second limiting perimeter of grounding lever 133; 14-Elastic component; 151-Closing limit post; 152-Grounding limit post; 2-Base. Detailed Implementation

[0026] The schematic scheme of the three-station operating mechanism disclosed in this invention will now be described in detail with reference to the accompanying drawings. Although the drawings are provided to illustrate some embodiments of the invention, they are not necessarily drawn to the dimensions of the specific embodiments, and certain features may be enlarged, removed, or partially cut to better illustrate and explain the disclosure of the invention. Some components in the drawings may be repositioned according to actual needs without affecting the technical effect. The phrase "in the drawings" or similar expressions appearing in the specification do not necessarily refer to all drawings or examples.

[0027] Certain directional terms used in the description of the accompanying drawings below, such as “inner,” “outer,” “above,” “below,” and other directional terms, will be understood to have their normal meaning and refer to those directions as normally viewed in the accompanying drawings. Unless otherwise specified, the directional terms used in this specification are generally in accordance with the conventional directions understood by those skilled in the art.

[0028] The terms “first,” “first,” “second,” “second,” and similar terms used in this invention do not indicate any order, quantity, or importance, but are used to distinguish one component from others.

[0029] The terms “joining”, “connection” and similar terms used in this invention include both indirect connection of two components with the aid of an intermediate layer (e.g., adhesive, welding agent, etc.) or intermediate parts (e.g., connector, transition piece, etc.) and direct connection of two components without the aid of any intermediate layer (e.g., adhesive, welding agent, etc.) or intermediate parts (e.g., connector, transition piece, etc.).

[0030] Figures 1 to 6The three-position operating mechanism 1 of the present invention is illustrated by way of example. The three-position operating mechanism 1 in this example can be installed on a switchgear such as a three-position load switch or a three-position disconnect switch, so as to be controlled by an external control device to output closing, disconnection and grounding actions and maintain closing, disconnection and grounding actions. It has a simple structure and low manufacturing cost.

[0031] like Figure 1 and 2 As shown, exemplarily, the three-station operating mechanism 1 may include an output component 11, a closing drive component 12 and a grounding drive component 13 arranged on the left and right sides of the output component 11, and an elastic component 14 connecting the closing drive component 12 and the grounding drive component 13. The closing drive component 12 and the grounding drive component 13 may be driven by an external control device and the elastic component 14, so that the closing drive component 12 can drive the output component 11 to output a closing action or an isolation action, and the grounding drive component 13 can drive the output component 11 to output a grounding action or an isolation action.

[0032] The output component 11 may include an output shaft 111 rotatably connected to the base 2, an output plate 112 non-rotatably sleeved onto the output shaft 111, and a closing pin 113 and a grounding pin 114 arranged on both sides of the output shaft 111 on the output plate 112. The end of the output shaft 111 may extend through the base 2 to output the corresponding action. The output plate 112 can drive the output shaft 111 to move. The closing pin 113 and the grounding pin 114 can be arranged as follows: Figure 2 As shown, they are arranged on the left and right sides of the rotation axis of the output shaft 111.

[0033] The closing drive component 12 may include a closing operation shaft 121 rotatably connected to the base 2, a closing input plate 122 non-rotatably sleeved to the closing operation shaft 121, a closing lever 123 rotatably sleeved to the closing operation shaft 121, and a closing support seat connected to the closing input plate 122. The end of the closing operation shaft 121 may extend through the base 2 to receive external control. The closing input plate 122 may rotate with the closing operation shaft 121. The closing lever 123 is driven to rotate by the closing input plate 122 and has a closing opening 124 for engaging the closing lever 113. The closing support seat may be connected to and interact with the elastic member 14.

[0034] The grounding drive component 13 is basically arranged the same as the closing drive component 12. The grounding drive component 13 may include a grounding operating shaft 131 rotatably connected to the base 2, a grounding input plate 132 non-rotatably sleeved to the grounding operating shaft 131, a grounding dial plate 133 rotatably sleeved to the grounding operating shaft 131, and a grounding support connected to the grounding input plate 132. The end of the grounding operating shaft 131 may extend through the base 2 to receive external control. The grounding input plate 132 may rotate with the grounding operating shaft 131. The grounding dial plate 133 is driven to rotate by the grounding input plate 132 and has a grounding opening 134 for engaging the grounding dial pin 114. The grounding support may be connected to and interact with the elastic member 14.

[0035] In actual operation, when a closing action is required, the grounding drive component 13 remains stationary, while the closing operation shaft 121 is controlled by an external operating device to move as follows: Figure 2 As shown, rotating counterclockwise causes the closing input plate 122 to rotate and compress the elastic component 14. After the elastic component 14 reaches its dead position, it releases energy and pushes the closing input plate 122. The closing input plate 122 then pushes the closing lever 123 to rotate counterclockwise. The closing opening 124 then engages the closing pin 113, causing the closing pin 113 to move. The output plate 112 is then driven to rotate clockwise from the isolation position to the closing position. The output shaft 111 is driven by the output plate 112 to output the closing action. When an isolation action is required, the closing operation shaft 121 can be controlled to rotate clockwise. The subsequent operation process can be reversed to output the closing action, which will not be described here.

[0036] Similarly, when a grounding operation is required, the closing drive component 12 remains stationary, while the grounding operation shaft 131 is controlled by an external operating device to move as follows: Figure 2 As shown, rotating clockwise causes the grounding input plate 132 to rotate and compress the elastic member 14. After the elastic member 14 reaches its dead position, it releases energy and pushes the grounding input plate 132. The grounding input plate 132 then pushes the grounding dial plate 133 to rotate clockwise. The grounding opening 134 then engages with the grounding pin 114, causing the grounding pin 114 to move. The output plate 112 is then driven to rotate counterclockwise from the isolation position to the grounding position. The output shaft 111 is driven by the output plate 112 to output a grounding action. When an isolation action is required, the grounding operation shaft 131 can be controlled to rotate counterclockwise. The subsequent operation process can be reversed to output a grounding action, which will not be described here.

[0037] In embodiments of the present invention, the three-position operating mechanism 1 further includes a closing limit pin 115 and a grounding limit pin 116 disposed on the output plate 112, and a limiting structure optionally arranged at the end of the stroke of the closing drive component 12 and the grounding drive component 13, such as a closing limit post 151 and a grounding limit post 152 fixedly connected to the base 2. Figures 1 to 6 As shown, the closing limit pin 115 and the grounding limit pin 116, as well as the closing limit post 151 and the grounding limit post 152, can all be distributed in... Figure 2 The left and right sides of the rotation axis of the output shaft 111 shown. The closing lever 123 and the grounding lever 133 can be generally located on the upper side of the output shaft 111, while the closing limit post 151 and the grounding limit post 152 are both located on the lower side of the output shaft 111. The grounding limit post 152 and the closing lever 123 are both located on the left side of the output shaft 111, and the closing limit post 151 and the grounding lever 133 are both located on the right side of the output shaft 111.

[0038] Optionally, the base 2 may include a first substrate and a second substrate spaced apart from each other, in which case the three-station operating mechanism 1 may be arranged between the first substrate and the second substrate. The first substrate and the second substrate may be connected together by a plurality of connectors, such as double-ended studs, generally arranged around their peripheries. Therefore, the limiting post may also be served by a connector for connecting the first substrate and the second substrate, thereby further reducing the number of parts required for the three-station operating mechanism 1 of the present invention.

[0039] Furthermore, the rotation radius of the second limiting perimeter 126 extending from the end of the closing opening 124 away from the output plate 112 of the closing lever 123 is greater than the rotation radius of the first limiting perimeter 125 extending from the end of the closing opening 124 near the output plate 112; the rotation radius of the second limiting perimeter 136 extending from the end of the grounding opening 134 away from the output plate 112 of the grounding lever 133 is greater than the rotation radius of the first limiting perimeter 135 extending from the end of the grounding opening 134 near the output plate 112; the rotation radius of the closing pin 113 is greater than the rotation radius of the closing limiting pin 115; and the rotation radius of the grounding pin 114 is greater than the rotation radius of the grounding limiting pin 116.

[0040] Therefore, as Figure 2As shown. When the output board 112 is in the isolation position, the first limiting periphery 125 of the closing lever 123 abuts against the closing pin 113 and the first limiting periphery 135 of the grounding lever 133 abuts against the grounding pin 114. Furthermore, the distance between the abutment point of the closing pin 113 and the first limiting periphery 125 of the closing lever 123 and the rotation axis of the output board 112 is less than the distance from the radially furthest side of the closing lever 113 relative to the rotation axis of the output board 112 to the rotation axis of the output board 112, and this abutment point is located on the clockwise side of the radially furthest side on the closing lever 113. Therefore, when the output board 112 is driven by the closing lever 123 to rotate from the closing position to the isolation position in the second direction (counterclockwise), the energy release speed of the elastic member 14 is relatively fast, thus the output... The grounding pin 114 of plate 112 will collide with the first limiting periphery 135 of grounding plate 133, which will cause the output plate 112 to rebound in the first direction, i.e., clockwise. At this time, the first limiting periphery 125 of closing plate 123 is constructed to limit the rebound movement and resist the rebound torque. The torque applied by closing pin 113 to closing plate 123 is zero or a counterclockwise torque, thereby preventing the output plate 112 from rotating clockwise around the rotation axis of the output plate 112 when there is no external force, so as to achieve the rigid limiting of the clockwise direction of the closing plate 123 on the output plate 112. Similarly, the distance between the contact point of the grounding pin 114 and the first limiting periphery 135 of the grounding plate 133 and the rotation axis of the output plate 112 is less than the distance between the radially furthest side of the grounding pin 114 and the rotation axis of the output plate 112, and this contact point is located on the counterclockwise side of the radially furthest side of the grounding pin 114. Therefore, when the output plate 112 is driven by the grounding plate 133 to rotate clockwise from the grounding position to the isolation position, the energy release speed of the elastic member 14 is relatively fast, so when the output plate 112 moves to the isolation position... The closing pin 113 of the output board 112 will collide with the first limiting periphery 125 of the closing plate 123, which will cause the output board 112 to rebound in a counterclockwise direction. At this time, the first limiting periphery 135 of the grounding plate 133 is configured to limit the rebound movement and resist the rebound torque. The torque applied by the grounding pin 114 to the grounding plate 133 is zero or a clockwise torque, thereby preventing the output board 112 from rotating counterclockwise around the rotation axis without external force, so as to achieve the rigid limiting of the output board 112 by the grounding plate 133 in the counterclockwise direction. Therefore, both the clockwise and counterclockwise rotation of the output shaft 111 are restricted, thereby locking the output board 112 and the output shaft 111 in an isolated state.

[0041] like Figures 3 to 5As shown, when the output shaft 111 outputs a closing action and the output plate 112 moves from the isolation position to the closing position, the closing lever 123 rotates counterclockwise. The first limiting periphery 125 of the closing lever 123 disengages from the closing pin 113. The closing lever 123 continues to rotate, causing the closing pin 113 to fall into the closing opening 124. The side of the second limiting periphery 126 of the closing opening 124 adjacent to the closing lever 123 abuts against the closing pin 113, causing the output plate 112 to rotate clockwise. When the output plate 112 moves from the isolation position to the closing position, the closing lever 123 rotates counterclockwise. Figure 3 through Figure 4 Move to Figure 5 When the circuit is in the closed position as shown, the second limiting periphery 126 of the closing lever 123, which has moved to the end of its stroke, can just abut against the closing limiting pin 115. Additionally, the lower side of the output plate 112 abuts against the closing limiting post 151. The distance from the abutment point of the closing limiting pin 115 and the second limiting periphery 126 of the closing lever 123 to the rotation axis of the output plate 112 is less than the distance from the radially furthest side of the closing limiting pin 115 relative to the rotation axis of the output plate 112 to the rotation axis of the output plate 112, and this abutment point on the closing limiting pin 115 is located on the counterclockwise side of that radially furthest side. Therefore, when the output plate 112 is driven by the closing lever 123 to rotate clockwise from the isolation position to the closing position, the energy release speed of the elastic component 14 is relatively fast. Therefore, after the output plate 112 moves to the closing position, it will collide with the closing limit pin 151. This will cause the output plate 112 to rebound in the counterclockwise direction. At this time, the second limiting periphery 126 of the closing lever 123 can be used to limit the rebound movement and resist the rebound torque. The torque applied by the closing limit pin 115 to the closing lever 123 is zero or a clockwise torque, thereby preventing the output plate 112 from rotating counterclockwise around the rotation axis of the output plate 112 without external force. This achieves the rigid limiting of the output plate 112 by the closing lever 123 in the counterclockwise direction. The closing limit post 151 is arranged on the clockwise rotation path of the output plate 112. Therefore, the closing limit post 151 abutting against the output plate 112 can also limit the clockwise rotation of the output plate 112 around the rotation axis. Thus, both the clockwise and counterclockwise rotation of the output shaft 111 are restricted, thereby locking the output plate 112 and the output shaft 111 in the closed state.

[0042] When the output shaft 111 is isolated and the output board 112 returns from the closed position to the isolated position, it can be roughly referred to from the... Figures 2 to 5In the reverse process, the second limiting periphery 126 of the closing lever 123 disengages from the closing limiting pin 115. Subsequently, the side of the first limiting periphery 125 of the closing opening 124, adjacent to the closing lever 123, abuts against the closing pin 113, causing the output plate 112 to rotate counterclockwise until the closing pin 113 disengages from the closing opening 124 and the first limiting periphery 125 of the closing lever 123 abuts against the closing pin 113. At the same time, the grounding pin 114 on the output plate 112 abuts against the first limiting periphery 135 of the grounding lever 133, thereby locking the output plate 112 and the output shaft 111 in the above-mentioned isolation state.

[0043] Understandably, the movement process of the grounding dial 133 and related components during the output grounding action and the return from the grounding state to the isolation state during the output isolation action of the output shaft 111 can be referred to the movement process of the closing dial 123 and related components during the output closing action and the return from the closing state to the isolation state during the output isolation action of the output shaft 111, and will not be repeated here.

[0044] In the actual design process, a certain gap can be left between the closing drive component 12 and the grounding drive component 13 and the various structures of the output component 11 to avoid interference between the structures due to manufacturing errors during manufacturing. In addition, it should be noted that, for ease of explanation, the two pins are specifically described as closing pin 113 and grounding pin 114, and the two plates are specifically described as first plate / closing plate 123 and second plate / grounding plate 133. The first position, second position, and third position are the isolation position, closing position, and grounding position, respectively. Furthermore, the adjacent pins, limit pins, and limit posts of the closing plate 123 are located on the same side of the rotation axis of the output shaft 111. Figure 2 The closing pin 113, closing limit pin 115, and grounding limit post 152 shown on the left side, and the adjacent pins, limit pins, and limit posts of the grounding plate 133 are on the same side as the rotation axis of the output shaft 111, as shown in the figure. Figure 2 The grounding pin 114, closing limit pin 115, and closing limit post 151 are shown on the right side.

[0045] Optionally, the first and second limiting edges of each lever plate smoothly transition to their respective openings, thereby preventing damage to the levers and limiting pins during engagement and improving the service life of the three-position operating mechanism 1. Optionally, each output plate 112 may be provided with a limiting groove 117 that engages with the corresponding limiting post. For example, if the limiting post is constructed in a cylindrical shape, the limiting groove 117 may be correspondingly constructed as an arc-shaped groove to improve the stability of the mechanism in the locked state.

[0046] Optionally, the side of the opening of each lever that abuts against an adjacent lever to move the output plate 112 from the isolation position to the closed position or the ground position can be configured as a concave curve towards the lever to smoothly transfer the rotation of the lever to the output plate 112. For example, as shown... Figure 4 and 5 As shown, after the closing plate 123 engages with the closing pin 113, it drives the output plate 112 to move until the second limiting periphery 126 of the closing plate 123 begins to abut against the closing limit pin 115. Then, the closing plate 123 pushes the closing limit pin 115 through the second limiting periphery 126 to drive the output plate 112 to continue rotating. At this time, the side of the closing plate 123 adjacent to the second limiting periphery 126 can disengage from the closing pin 113 and there is a certain gap. Until it rotates to the closing position, the contact area between the second limiting periphery 126 of the closing plate 123 and the closing limit pin 115 is the largest and the output plate 112 abuts against the limit post 151. The side of the closing plate 123 adjacent to the second limiting periphery 126 can contact the closing pin 113 again. Therefore, the side of the closing opening 124 adjacent to the second limiting perimeter 126 is designed as a curve concave to the closing lever 123.

[0047] Optionally, the opening size of each lever is larger than the outer diameter of the adjacent pin, which facilitates the pin falling into the opening. Furthermore, the first and second limiting edges of each lever can be arranged as arc segments or straight segments, provided that the first and second limiting edges of the lever and the corresponding pin and limiting pin satisfy the aforementioned kinematic relationship and interaction.

[0048] Optionally, each pin can be rotatably connected to the output plate 112, thereby allowing each pin to roll within its engaged opening to reduce resistance to movement between them. Alternatively, the contact surfaces between each pin and the closing opening 124 can be made of a low-friction material or coated with a low-friction material to reduce resistance to movement between them.

[0049] It should be understood that although this specification describes various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0050] The above description is merely an illustrative embodiment of the present invention and is not intended to limit the scope of the invention. Any equivalent changes, modifications, and combinations made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. A three-station operating mechanism (1), which is mounted to a base (2) and comprises: Output plate (112), which is rotatably connected to the base (2) and has two pins located on both sides of its rotation axis; Two levers are rotatably connected to the base (2) and distributed on both sides of the rotation axis. Each lever has an opening for engaging the corresponding lever pin. The three-station operating mechanism (1) is characterized in that it further includes: Two limiting pins are arranged on the output plate (112) and located on both sides of the rotation axis; In this case, the first limiting periphery of each of the dial plates extending from the end of its respective opening near the axis of rotation abuts against the adjacent pin, thereby locking the output plate (112) in the first position. The first of the two dials is configured to rotate the output plate (112) in a first direction when engaged with an adjacent pin, until a second limiting periphery extending from the end of the first dial away from the axis of rotation abuts against an adjacent limiting pin, thereby moving the output plate (112) to a second position and preventing the output plate (112) from rotating in a second direction opposite to the first direction in the second position. The second of the two dials is configured to rotate the output plate (112) in a second direction when engaged with the adjacent dial pin, until the second limiting periphery extending from the end of its opening away from the axis of rotation abuts against the adjacent limiting pin, thereby moving the output plate (112) to a third position and preventing the output plate (112) from rotating in the first direction at the third position.

2. The three-station operating mechanism (1) according to claim 1, characterized in that, The rotation radius of the second limiting periphery of each of the aforementioned levers is greater than the rotation radius of its first limiting periphery.

3. The three-station operating mechanism (1) according to claim 2, characterized in that, The rotation radius of the pin is greater than that of the limit pin.

4. The three-station operating mechanism (1) according to claim 3, characterized in that, The first dial rotates with a torque in a first direction and engages with an adjacent pin to drive the output plate (112) to rotate in the first direction until the second limiting periphery of the first dial abuts against the adjacent limiting pin. The second limiting periphery of the first dial is configured to resist the rebound movement of the output plate (112) in a second direction, wherein the torque exerted by the limiting pin on the first dial is zero or the torque in the first direction.

5. The three-station operating mechanism (1) according to claim 4, characterized in that, The second dial rotates with a torque in the second direction and engages with an adjacent pin to drive the output plate (112) to rotate in the second direction until the second limiting periphery of the second dial abuts against the adjacent limiting pin. The second limiting periphery of the second dial is configured to resist the rebound movement of the output plate (112) in the first direction, wherein the torque exerted by the limiting pin on the second dial is zero or a torque in the second direction.

6. The three-station operating mechanism (1) according to claim 1, characterized in that, The opening size of each of the aforementioned dial plates is larger than the outer diameter of the adjacent dial pin.

7. The three-station operating mechanism (1) according to claim 1, characterized in that, Each of the aforementioned pins is rotatably connected to the output board (112).

8. A switching device, characterized in that, The switching device includes a base (2) and a three-position operating mechanism (1) as described in any one of claims 1 to 7 mounted on the base (2).

9. The switching device according to claim 8, characterized in that, The base (2) is configured as two spaced-apart substrates, and the limiting post is used to connect the two substrates to keep the two substrates in a spaced-apart state.

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