Compact snap-action three-position mechanism with lock

Abstract

The utility model relates to a compact type is with locking quick action three position mechanism, especially in higher operation accuracy's compact type is with locking quick action three position mechanism, its specific structure includes mounting bracket, spindle, ground operation axle, three position operation subassembly and operation locking panel, spindle, ground operation axle, three position operation subassembly and operation locking panel set up on the mounting bracket respectively, spindle is connected with three position operation subassembly, is equipped with first cam on ground operation axle, is equipped with second cam on the spindle, is equipped with sector gear part respectively on first cam and second cam, the same number of teeth of sector gear part, ensure the synchronism when meshing drive, first direction rotation limit locking group is formed with first tooth of first cam left side end and first tooth of second cam right side end, and the excessive rotation of limiting mechanism clockwise direction, second direction rotation limit locking group is formed with first tooth of first cam right side end and first tooth of second cam left side end, and the excessive rotation of limiting mechanism counterclockwise direction.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker switching technology, and in particular to a compact three-position mechanism with locking stop speed control. Background Technology

[0002] A three-position switch is a circuit breaker switch assembly with closed, open, and grounded positions. In existing technology, the main shaft and grounding operating shaft of a three-position switch are typically linked via a gear transmission mechanism, as illustrated in publication number CN 204905076. U's patent discloses a three-position module for a solid-insulated switchgear. The main shaft and grounding operating shaft are linked via a gear transmission mechanism. The main shaft has a complete gear, while the grounding operating shaft has a sector gear with a set central angle. This design ensures that the gear on the main shaft and the sector gear on the grounding operating shaft can only mesh within a set angle range. After the grounding operating shaft rotates a certain angle, the sector gear on the grounding operating shaft disengages from the gear on the main shaft. If the grounding operating shaft continues to rotate at this point, the main shaft will not continue to rotate. The drawback of this design is that while it limits the rotation angle of the main shaft, there is no corresponding limit on the rotation between the grounding operating shaft and the main shaft. Even after the main shaft has reached its designated position, the grounding operating shaft can continue to rotate. This structure results in low operating accuracy for the three-position switch. Furthermore, when the sector gear engages with the gear on the main shaft, the first tooth of the sector gear is prone to significant friction, affecting its service life. Therefore, improvements are needed. Summary of the Invention

[0003] The purpose of this invention is to solve the problem that the rotation between the main shaft and the grounding operation shaft of the existing three-position switch is not limited, resulting in low operating accuracy of the three-position switch, and to provide a three-position mechanism.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A compact three-position locking mechanism includes a mounting frame, a main shaft, a grounding operating shaft, a three-position operating assembly, and an operating locking panel. The main shaft, grounding operating shaft, three-position operating assembly, and operating locking panel are respectively mounted on the mounting frame. The main shaft is connected to the three-position operating assembly. A first cam is provided on the grounding operating shaft, and a second cam is provided on the main shaft. A sector gear portion is provided on the first cam and the second cam respectively. The sector gear portions have the same number of teeth to ensure synchronicity during meshing transmission. The first tooth on the left end of the first cam and the first tooth on the right end of the second cam form a first directional rotation limit locking group to limit excessive clockwise rotation of the mechanism. The first tooth on the right end of the first cam and the first tooth on the left end of the second cam form a second directional rotation limit locking group to limit excessive counterclockwise rotation of the mechanism.

[0006] In the above scheme, the operation locking panel is fixedly mounted on the mounting bracket and is located on the front side of the spindle, the grounding operation shaft, and the three-position operation assembly. The operation locking panel has a spindle operation hole corresponding to the spindle and a grounding operation hole corresponding to the grounding operation shaft. The operation locking panel also has a first sliding plate and a second sliding plate, which are slidably connected to the operation locking panel. The position of the first sliding plate corresponds to the position of the grounding operation hole, and the position of the second sliding plate corresponds to the position of the spindle operation hole. The first sliding plate has a notch corresponding to the grounding operation hole, and the second sliding plate has a notch corresponding to the spindle operation hole. The operation locking panel has a return spring that is connected to the first sliding plate and the second sliding plate respectively. The return spring causes the notch on the first sliding plate to be misaligned from the grounding operation hole and the notch on the second sliding plate to be misaligned from the spindle operation hole. This design significantly simplifies the operation locking panel of the three-station mechanism of this invention compared to the operation locking panel structure of the prior art which uses at least three-layer plate mechanisms. It requires less material, reduces costs, and makes locking and unlocking of the grounding operation hole and the spindle operation hole smoother.

[0007] In the above scheme, the first cam has a first protrusion facing radially outward at a position away from the sector gear portion, and the second cam has a second protrusion facing radially outward at a position away from the sector gear portion. A first lifting guide rod is connected to the upper part of the first sliding plate. A first upper guide groove is provided on the upper part of the mounting bracket. The rear end of the first lifting guide rod slides in cooperation with the first upper guide groove. A first lower guide groove is provided at the lower part of the operation locking panel. A first lower guide portion is provided at the lower end of the first sliding plate, extending into the first lower guide groove. When the first protrusion on the first cam rotates to the upper position of the first cam, the second... A protrusion rests below the first lifting guide rod, preventing the first sliding plate from sliding up and down. The lower part of the second sliding plate is provided with a second lifting guide rod, and the lower part of the mounting bracket is provided with a second lower guide groove corresponding to the second lifting guide rod. The rear end of the second lifting guide rod slides in conjunction with the second lower guide groove. The upper part of the operation locking panel is provided with a second upper guide groove, and the lower end of the second sliding plate is provided with a second upper guide part, which extends into the second upper guide groove. When the second protrusion on the second cam rotates to the lower position of the second cam, the second protrusion rests above the second lifting guide rod, preventing the second sliding plate from sliding up and down. With this configuration, when the three-position switch is in the isolated state, the first cam on the grounding operating shaft rotates to the position where the first protrusion is at the top. At this time, the first sliding plate blocks the grounding operating hole and is limited by the first protrusion to move up and down, thus preventing grounding operation. Conversely, when the grounding operating shaft rotates to the grounding state, the second cam on the main shaft rotates to the position where the second protrusion is at the bottom. At this time, the second sliding plate blocks the main shaft operating hole and is limited by the second protrusion to move up and down, preventing isolation operation. This design prevents accidental operation of the three-position switch.

[0008] In the above design, both the first and second sliding plates are provided with oblong holes, and the operation locking panel is provided with lifting guide columns corresponding to the oblong holes on the first and second sliding plates, respectively. This arrangement ensures that the lifting and lowering movements of the first and second sliding plates are along the vertical direction, preventing deflection.

[0009] In the above scheme, the main shaft is provided with a third cam, and the mounting bracket is provided with a third sliding plate. The third sliding plate can slide left and right relative to the mounting bracket. The right end of the third sliding plate is connected to a locking rod, which corresponds to the door lifting lock hole of the circuit breaker operating mechanism. The mounting bracket is provided with a return spring, which is connected to the third sliding plate. The return spring can keep the third sliding plate in a position close to the inside of the mounting bracket. The left end of the third sliding plate is provided with a top edge, the position of which corresponds to the third cam. By setting a third cam, the third cam rotates with the rotation of the main shaft. When the main shaft rotates to the isolation state, the protruding part of the third cam presses against the top edge of the left end of the third sliding plate, causing the third sliding plate to slide to the right, so that the locking rod is inserted into the lifting lock hole on the cabinet door of the circuit breaker operating mechanism, thereby locking the cabinet door of the circuit breaker operating mechanism. When the main shaft is not in the isolation state, the protruding part of the third cam moves away from the third sliding plate, and under the action of the return spring, the third sliding plate can drive the locking rod to slide to the left, releasing the locking of the lifting lock hole of the cabinet door of the circuit breaker operating mechanism.

[0010] In the above scheme, the mounting bracket is also equipped with a fourth sliding plate, which can slide left and right relative to the operation locking panel. A pin is provided at the end of the fourth sliding plate, which is engaged with the cabinet door lock of the circuit breaker operating mechanism. A baffle is connected to the left end of the fourth sliding plate, and the baffle has a notch corresponding to the main shaft operating hole. A return spring is provided on the operation locking panel, and the return spring is connected to the baffle. With this configuration, when the cabinet door of the circuit breaker operating mechanism is open, the pin moves towards the three-position switch, and the notch on the baffle of the fourth sliding plate moves to a state of misalignment with the main shaft operating hole on the operation locking panel, causing the baffle to block the main shaft operating hole, thus preventing operation of the main shaft.

[0011] In the above design, the back plate of the mounting bracket is equipped with a linkage mechanism. One end of the linkage mechanism is movably connected to the rear end of the main shaft, and the other end is connected to a three-position switch status indicator mechanism. This configuration allows the operating status of the three-position switch to be displayed, facilitating corresponding operations.

[0012] In the above scheme, curved limiting parts are provided near the top of the first tooth on the left side of the first cam and the first tooth on the left side of the second cam. This setting allows the sector gears on the first and second cams to remain in a meshed state, and locking limits can be achieved at the leftmost and rightmost ends of the meshed state, improving the operating accuracy of the three-position switch.

[0013] This invention offers several advantages: The compact, locking, speed-stopping three-position mechanism features a first cam on the grounding operation shaft and a second cam on the main shaft. Sector gears are mounted on both the first and second cams, meshing with each other. Furthermore, the first tooth on the left side of the first cam and the first tooth on the right side of the second cam form a first directional rotation limit locking group, restricting excessive clockwise rotation. Conversely, the first tooth on the right side of the first cam and the first tooth on the left side of the second cam form a second directional rotation limit locking group, restricting excessive counter-clockwise rotation. This design ensures that when the main shaft rotates counter-clockwise for isolation, the first tooth on the left side of the first cam meshes with the first tooth on the right side of the second cam, creating a rotation limit and preventing further counter-clockwise rotation, thus guaranteeing the accuracy of the isolation operation. Similarly, when the grounding operation shaft rotates counter-clockwise for grounding, the first tooth on the right side of the first cam meshes with the first tooth on the left side of the second cam, creating a rotation limit and preventing further rotation, thus improving the accuracy of the grounding operation. Because the sector gears on the first and second cams can remain in a meshed state, wear during the first gear meshing can be avoided, thus extending the service life of the gears. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of the compact three-station mechanism with locking stop speed control according to this utility model.

[0015] Figure 2 This is a schematic diagram of the structure of the compact locking stop three-station mechanism of this utility model without displaying the operation locking panel.

[0016] Figure 3 This is a schematic diagram of the connection structure of the main shaft, grounding operating shaft, and three-station operating components of the compact locking stop speed-moving three-station mechanism of this utility model.

[0017] Figure 4 This is a schematic diagram of the connection structure between the operation locking panel and the front support plate.

[0018] Figure 5 This is a schematic diagram of the connection structure between the operation locking panel and the rear side of the front support plate.

[0019] Figure 6 A schematic diagram of the rear structure for operating the locking panel.

[0020] Figure 7 This is a schematic diagram of the connection structure of the first cam, the second cam, and the third sliding plate.

[0021] Figure 8 This is a schematic diagram of the rear connection structure of the first cam, the second cam, and the third sliding plate.

[0022] The reference numerals in the figure are as follows: mounting bracket 1, rear support plate 11, front support plate 12, grounding operation shaft 2, first cam 21, sector gear part 22, first protrusion part 23, curved surface limiting part 24, main shaft 3, second cam 31, third cam 32, second protrusion part 33, sector gear part 34, curved surface limiting part 35, three-position operation assembly 4, operation locking panel 5, main shaft operation hole 51, grounding operation hole 52, first sliding plate 53, first lifting guide rod 531, first upper guide groove 532, first lower guide groove 533, second sliding plate 54, second lifting guide rod 541, second upper guide groove 542, second lower guide groove 543, reset spring 55, third sliding plate 56, locking rod 561, top edge 562, fourth sliding plate 57, pin rod 571, baffle 572, cabinet door lock 6, linkage mechanism 7, three-position switch status indicator mechanism 8. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below through embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] like Figure 1-8 As shown, the compact three-station mechanism with locking stop speed control of this utility model includes a mounting bracket 13, a main shaft, a grounded operating shaft 2, a three-station operating assembly 4, and an operating locking panel 5.

[0025] The three-station operation component 4 can adopt existing technology, for example, it can refer to the structure of the three-station module disclosed in Chinese patents with publication numbers CN 204905076U or CN105070550B. This utility model will not elaborate on this part of the structure. The connection structure of the three-station operation component 4 can be referred to the appendix. Figure 3 .

[0026] like Figure 1 As shown, the compact three-station mechanism with locking stop speed movement of this utility model has a mounting frame 1 composed of a rear support plate 11 and a front support plate 12. A support part is provided on the rear side of the front support plate 12, and the support part is fixedly connected to the rear support plate 11. Through this arrangement, a certain gap is maintained between the front support plate 12 and the rear support plate 11, so that the three-station operation component 4 can be set between the front support plate 12 and the rear support plate 11.

[0027] The main shaft 3 is a long rod-shaped main shaft. The main shaft 3 can be the main shaft of an existing three-position switch. The main shaft 3 is connected to the three-position operation component 4. By rotating the main shaft 3, the actuating element in the three-position operation component 4 can be driven to rotate, thereby realizing the function operation of the three-position operation component.

[0028] The rear end of the main shaft 3 extends to the rear side of the rear support plate 11, and the front end of the main shaft 3 extends to the front side of the front support plate 12. A second cam 31 is provided on the main shaft 3, and the second cam 31 is located on the front side of the front support plate 12.

[0029] like Figure 2 As shown, the second cam 31 is fixedly connected to the main shaft 3. A sector gear portion 34 is provided on the second cam 31. A second protrusion 33 is provided on the side away from the sector gear portion 34. The second protrusion 33 protrudes radially outward.

[0030] The central angle of the sector gear section 34 on the second cam 31 can be set according to the rotation angle of the main shaft 3 during three-position operation. For example, as shown in the attached figure, the central angle of the sector gear section 34 is about 150°-175°.

[0031] like Figure 2 As shown, a curved limiting part 35 is provided at the position of the leftmost tooth of the sector gear 34 on the second cam 31 near the top. When the leftmost tooth of the sector gear on the second cam 31 meshes with the rightmost tooth of the sector gear on the first cam 21, the curved limiting part 35 can abut against the side of the rightmost tooth of the sector gear on the first cam 21 to form a rotation limit.

[0032] The grounding operating shaft 2 can be an existing grounding operating shaft. The grounding operating shaft 2 passes through the front support plate 12 and the rear support plate 11 of the mounting bracket 1. The rear end of the grounding operating shaft 2 extends to the rear side of the rear support plate 11, and the front end extends to the front side of the front support plate 12. A first cam 21 is provided on the grounding operating shaft 2, located on the front side of the front support plate 12. The first cam 21 is fixedly connected to the grounding operating shaft 2. A sector gear portion 22 is provided on the first cam 21, and a first protrusion 23 is provided on the side away from the sector gear portion 22, protruding radially outward.

[0033] The central angle of the sector gear section 22 on the first cam 21 can be set according to the rotation angle of the main shaft 3 during three-position operation. For example, as shown in the attached figure, the central angle of the sector gear section 22 is about 150°-175°.

[0034] like Figure 2As shown, a curved limiting part 24 is provided at the position of the leftmost tooth of the sector gear 22 on the first cam 21 near the top. When the leftmost tooth of the sector gear on the first cam 21 meshes with the rightmost tooth of the sector gear on the second cam 31, the curved limiting part 24 can abut against the side of the rightmost tooth of the sector gear on the second cam 31 to form a rotation limit, so that the main shaft 3 cannot continue to rotate counterclockwise.

[0035] like Figure 2 , 7 As shown in Figure 8, sector gear sections are respectively provided on the first cam 21 and the second cam 31. The number of teeth in the sector gear sections is the same to ensure synchronicity during meshing transmission. The first tooth at the left end of the first cam 21 and the first tooth at the right end of the second cam 31 form a first directional rotation limit locking group, which restricts excessive clockwise rotation of the mechanism. When the first tooth at the left end of the first cam 21 meshes with the first tooth at the right end of the second cam 31, the three-position switch is in the isolation state. Through tooth locking, the isolation operation accuracy of the three-position switch can be improved. The first tooth at the right end of the first cam 21 and the first tooth at the left end of the second cam 31 form a second directional rotation limit locking group, which restricts excessive counterclockwise rotation of the mechanism. When the first tooth at the right end of the first cam 21 meshes with the first tooth at the left end of the second cam 31, the three-position switch is in the grounding state. Through tooth locking, the grounding operation accuracy of the three-position switch can be improved.

[0036] like Figure 4-6 As shown, the operation locking panel 5 is fixedly installed on the front side of the mounting bracket 1. The operation locking panel 5 is fixedly connected to the front support plate 12 through the connecting column, so that a cavity is formed between the operation locking panel 5 and the front support plate 12.

[0037] The operation locking panel 5 is provided with a spindle operation hole 51 corresponding to the spindle 3 and a grounding operation hole 52 corresponding to the grounding operation shaft 2. The operation locking panel 5 is also provided with a first sliding plate 53 and a second sliding plate 54. The first sliding plate 53 and the second sliding plate 54 are slidably connected to the operation locking panel 5. The position of the first sliding plate 53 corresponds to the position of the grounding operation hole 52, and the position of the second sliding plate 54 corresponds to the position of the spindle operation hole 51. The first sliding plate 53 is provided with a notch corresponding to the grounding operation hole 52, and the second sliding plate 54 is provided with a notch corresponding to the spindle operation hole 51. The operation locking panel 5 is provided with a return spring 55 connected to the first sliding plate 53 and the second sliding plate 54 respectively. One return spring 55 causes the notch on the first sliding plate 53 to be misaligned from the grounding operation hole 52, and the other return spring 55 causes the notch on the second sliding plate 54 to be misaligned from the spindle operation hole 51.

[0038] The first cam 21 has a first protrusion 23 radially outward at a position away from the sector gear portion 22, and the second cam 31 has a second protrusion 33 radially outward at a position away from the sector gear portion 34. The upper part of the first sliding plate 53 is connected to a first lifting guide rod 531. The upper part of the front support plate 12 has a first upper guide groove 532. The rear end of the first lifting guide rod 531 slides in cooperation with the first upper guide groove 532. The lower part of the operation locking panel 5 has a first lower guide groove 533. The lower end of the first sliding plate 53 has a first lower guide portion that extends into the first lower guide groove 544. When the first protrusion 23 on the first cam 21 rotates to the upper position of the first cam 21, the first protrusion 23 pushes against the first lower guide groove 544. Below the first lifting guide rod 531, the first sliding plate 53 cannot slide up and down; the lower part of the second sliding plate 54 is provided with a second lifting guide rod 541, and the lower part of the front support plate 12 is provided with a second lower guide groove 543 corresponding to the second lifting guide rod 541. The rear end of the second lifting guide rod 541 slides in cooperation with the second lower guide groove 543. The upper part of the operation locking panel 5 is provided with a second upper guide groove 542, and the lower end of the second sliding plate 54 is provided with a second upper guide part. The second upper guide part extends into the second upper guide groove 542. When the second protrusion 33 on the second cam 31 rotates to the lower position of the second cam 31, the second protrusion 33 pushes against the second lifting guide rod 541, preventing the second sliding plate 54 from sliding up and down. With this configuration, when the three-position switch is in the isolated state, the first cam 21 on the grounding operating shaft 2 rotates to the position where the first protrusion 23 is at the top. At this time, the first sliding plate 53 blocks the grounding operating hole 52, and the first sliding plate 53 is limited by the first protrusion 23 and cannot move up or down, so grounding operation cannot be performed. When the grounding operating shaft 2 rotates to the grounding state, the second cam 31 on the main shaft 3 rotates to the position where the second protrusion 33 is at the bottom. At this time, the second sliding plate 54 blocks the main shaft operating hole 51, and the second sliding plate 54 is limited by the second protrusion 33 and cannot move up or down, so isolation operation cannot be performed. This design prevents accidental operation of the three-position switch.

[0039] Furthermore, both the first sliding plate 53 and the second sliding plate 54 are provided with oblong holes, and the operation locking panel 5 is provided with lifting guide posts corresponding to the oblong holes on the first sliding plate 53 and the second sliding plate 54, respectively. This arrangement ensures that the lifting and lowering movements of the first sliding plate 53 and the second sliding plate 54 are along the vertical direction, preventing deflection.

[0040] Referring to the three-position module operation panel of the solid insulation cabinet operation mechanism disclosed in the aforementioned Chinese patent with publication number CN105070550B, the operation locking panel of the compact three-position mechanism with locking stop speed-moving mechanism of this utility model has a significantly simplified structure compared with the operation locking panel structure of the prior art that uses at least three-layer plate mechanism, requiring less material, reducing costs, and enabling smoother locking and unlocking of the grounding operation hole and the spindle operation hole.

[0041] Furthermore, a third cam 32 is provided on the main shaft 3, and a third sliding plate 56 is provided on the front support plate 12 of the mounting bracket 1. The third sliding plate 56 can slide left and right relative to the front support plate 12. A locking rod 561 is connected to the right end of the third sliding plate 56. The locking rod 561 corresponds to the door lifting lock hole of the circuit breaker operating mechanism. A return spring 55 is provided on the front support plate 12. The return spring 55 is connected to the third sliding plate 56. The return spring 55 can keep the third sliding plate 56 in a position close to the inner side of the front support plate 12. A top edge 562 is provided at the left end of the third sliding plate 56. The position of the top edge 562 corresponds to the third cam 32. By setting a third cam 32, the third cam 32 rotates with the rotation of the main shaft 3. When the main shaft 3 rotates to the isolation state, the protruding part of the third cam 32 presses against the top edge 562 of the left end of the third sliding plate 56, causing the third sliding plate 56 to slide outward, so that the locking rod is inserted into the lifting lock hole on the cabinet door of the circuit breaker operating mechanism, thereby locking the cabinet door of the circuit breaker operating mechanism. When the main shaft 3 is not in the isolation state, the protruding part of the third cam 32 is away from the third sliding plate 56. Under the action of the return spring 55, the third sliding plate 56 can drive the locking rod 561 to slide inward, thereby releasing the locking of the lifting lock hole of the cabinet door of the circuit breaker operating mechanism.

[0042] Furthermore, a fourth sliding plate 57 is provided on the front support plate 12. The fourth sliding plate 57 can slide left and right relative to the operation locking panel 5. A pin 571 is provided at the end of the fourth sliding plate 57. The pin 571 is inserted into the cabinet door lock 6 on the cabinet door of the circuit breaker operating mechanism. A baffle 572 is connected to the left end of the fourth sliding plate 57. The baffle 572 has a notch corresponding to the main shaft operating hole 51. A return spring is provided on the operation locking panel 5. The return spring is connected to the baffle 572. With this arrangement, when the cabinet door of the circuit breaker operating mechanism is in the open state, the pin 571 moves towards the three-position switch. The notch on the baffle 572 on the fourth sliding plate 57 moves to a state of misalignment with the main shaft operating hole on the operation locking panel, so that the baffle 572 blocks the main shaft operating hole 51. At this time, the main shaft 3 cannot be operated.

[0043] Furthermore, a linkage mechanism 7 is provided on the rear side of the rear support plate 11. One end of the linkage mechanism 7 is movably connected to the rear end of the main shaft 3, and the other end of the linkage mechanism 7 is connected to the three-position switch status indicator mechanism 8. This arrangement can display the working status of the three-position switch to facilitate corresponding operations.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A compact three-station mechanism with locking stop, characterized in that, The device includes a mounting frame, a main spindle, a grounding operating shaft, a three-position operating assembly, and an operating locking panel. The main spindle, grounding operating shaft, three-position operating assembly, and operating locking panel are respectively mounted on the mounting frame. The main spindle is connected to the three-position operating assembly. A first cam is provided on the grounding operating shaft, and a second cam is provided on the main spindle. A sector gear is provided on the first cam and the second cam respectively. The sector gears have the same number of teeth to ensure synchronicity during meshing transmission. The first tooth on the left side of the first cam and the first tooth on the right side of the second cam form a first directional rotation limit locking group to limit excessive clockwise rotation of the mechanism. The first tooth on the right side of the first cam and the first tooth on the left side of the second cam form a second directional rotation limit locking group to limit excessive counterclockwise rotation of the mechanism.

2. The compact three-station mechanism with locking stop according to claim 1, characterized in that: The operation locking panel is fixedly mounted on the mounting bracket and is located on the front side of the spindle, grounding operating shaft, and three-position operating assembly. The operation locking panel has a spindle operating hole corresponding to the spindle and a grounding operating hole corresponding to the grounding operating shaft. It also has a first sliding plate and a second sliding plate, which are slidably connected to the operation locking panel. The position of the first sliding plate corresponds to the position of the grounding operating hole, and the position of the second sliding plate corresponds to the position of the spindle operating hole. The first sliding plate has a notch corresponding to the grounding operating hole, and the second sliding plate has a notch corresponding to the spindle operating hole. The operation locking panel also has return springs connected to the first and second sliding plates respectively. These return springs offset the notch on the first sliding plate from the grounding operating hole and the notch on the second sliding plate from the spindle operating hole.

3. The compact three-station mechanism with locking stop according to claim 2, characterized in that: The first cam has a first protrusion facing radially outward at a position away from the sector gear portion, and the second cam has a second protrusion facing radially outward at a position away from the sector gear portion. A first lifting guide rod is connected to the upper part of the first sliding plate. A first upper guide groove is provided on the upper part of the mounting bracket. The rear end of the first lifting guide rod slides in cooperation with the first upper guide groove. A first lower guide groove is provided at the lower part of the operation locking panel. A first lower guide portion is provided at the lower end of the first sliding plate, extending into the first lower guide groove. When the first protrusion on the first cam rotates to the upper position of the first cam, the first protrusion... The first sliding plate is positioned below the first lifting guide rod, preventing it from sliding up and down. The lower part of the second sliding plate is provided with a second lifting guide rod, and the lower part of the mounting bracket is provided with a second lower guide groove corresponding to the second lifting guide rod. The rear end of the second lifting guide rod slides into the second lower guide groove. A second upper guide groove is provided above the operation locking panel, and a second upper guide portion is provided at the lower end of the second sliding plate, extending into the second upper guide groove. When the second protrusion on the second cam rotates to the lower position of the second cam, the second protrusion rests above the second lifting guide rod, preventing the second sliding plate from sliding up and down.

4. The compact three-station mechanism with locking stop according to claim 2, characterized in that: Both the first and second sliding plates are provided with oblong holes, and the operation locking panel is provided with lifting guide columns that correspond to the oblong holes on the first and second sliding plates respectively.

5. The compact three-station mechanism with locking stop according to claim 1, characterized in that: The main shaft is provided with a third cam, and the mounting bracket is provided with a third sliding plate. The third sliding plate can slide left and right relative to the mounting bracket. The right end of the third sliding plate is connected to a locking rod, which corresponds to the door lifting lock hole of the circuit breaker operating mechanism. The mounting bracket is provided with a return spring, which is connected to the third sliding plate. The return spring can keep the third sliding plate in a position close to the inside of the mounting bracket. The left end of the third sliding plate is provided with a top edge, the position of which corresponds to the third cam.

6. The three-station mechanism according to claim 1, characterized in that: The mounting bracket is also provided with a fourth sliding plate, which can slide left and right relative to the operation locking panel. A pin is provided at the end of the fourth sliding plate, which is inserted into the cabinet door lock of the circuit breaker operating mechanism. A baffle is connected to the left end of the fourth sliding plate, and the baffle has a notch corresponding to the main shaft operating hole. A return spring is provided on the operation locking panel, and the return spring is connected to the baffle.

7. The compact three-station mechanism with locking stop according to claim 1, characterized in that: The mounting bracket has a linkage mechanism on its back plate. One end of the linkage mechanism is movably connected to the rear end of the main shaft, and the other end of the linkage mechanism is connected to the three-position switch status indicator mechanism.

8. The compact three-station mechanism with locking stop according to claim 1, characterized in that: The first tooth on the left side of the first cam and the first tooth on the left side of the second cam are provided with curved limiting parts near the top.

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