Switch operating mechanism

Abstract

An operating mechanism of a switch belongs to the technical field of low-voltage apparatuses. Comprising a support, a rotating disc and a stop lever, the stop lever is arranged on the support in a sliding mode through a first sliding piece and a second sliding piece which are arranged in a spaced mode, a stop boss is arranged on the stop lever, and when the rotating disc rotates to the position corresponding to opening of a switch, the stop boss is matched with the contour face of the rotating disc to lock the rotating disc at the position. The device is characterized in that the first sliding piece comprises a pair of first plummer blocks fixed on the stop lever and a first sliding groove which is formed in the support and extends in the sliding direction of the stop lever, the pair of first plummer blocks are contained in the first sliding groove in a matched mode, and the vertical projection of the stop boss on the connecting line of the pair of first plummer blocks is located between the pair of first plummer blocks. The device has the advantages of being long in overall service life, high in locking precision and simple in structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage electrical appliances, and particularly relates to a switch operating mechanism. Background Art

[0002] Switches, such as dual-source transfer switches, are used in power supply systems. When one power source fails, they prevent the failed source from supplying power to the load while reliably switching to the other source to ensure power continuity. These switches are commonly used in critical locations such as hospitals, airports, docks, and banks.

[0003] Existing dual power transfer switches utilize excitation drive, which increases transfer speed. Furthermore, for three-position transfer switches with two open positions, a two-open position stop function is added to the operating mechanism of the dual power transfer switch. When the operating mechanism's rotary disk is in a first rotational position corresponding to the switch closing, a drive device in the operating mechanism pushes a stop rod to disengage it from the rotary disk. As the rotary disk rotates from this first rotational position to a second rotational position corresponding to the switch opening, the drive device releases the pressure on the stop rod, causing the stop rod to contact the contour surface of the rotary disk and stop the rotary disk at the second rotational position. This solves the problem of the rotary disk being unable to reliably stop due to large residual energy from the excitation drive. As the current rating of the switch frame increases, the driving force of the excitation drive applied to the rotary disk also increases. Consequently, the stop rod, which stops the rotary disk in the position corresponding to the switch opening, experiences a similarly increased reaction force from the rotary disk. Therefore, to ensure that the rotary disk in the operating mechanism of a high-current switch can reliably stop, it is necessary to rationally improve the structure of the existing switch operating mechanism. To this end, the present applicant has developed a beneficial design, and the technical solution described below was developed in this context. Utility Model Content

[0004] The task of the utility model is to provide a switch operating mechanism, which has the advantages of long overall life, high locking accuracy and simple structure by fixing a pair of pillow blocks located on both sides of the limiting boss on the stop rod.

[0005] The task of the utility model is accomplished in this way. A switch operating mechanism includes a bracket, a turntable and a stop rod, the stop rod is slidably set on the bracket through a pair of first sliding members and second sliding members arranged at intervals, and the stop rod is provided with a stop boss. When the turntable rotates to the position corresponding to the switch opening, the stop boss cooperates with the contour surface of the turntable to lock the turntable in this position, and is characterized in that: the first sliding member includes a pair of first pillow blocks fixed on the stop rod and a first slide groove extended along the sliding direction of the stop rod on the bracket, the pair of first pillow blocks are accommodated in the first slide groove, and the vertical projection of the stop boss on the connecting line of the pair of first pillow blocks is located between the pair of first pillow blocks.

[0006] In a specific embodiment of the present invention, the number of the first slide groove is one, and it and the second sliding member are located on the same side of the rotation center of the turntable. A pair of first pillow blocks are arranged in sequence along the sliding direction of the stop rod, and the end of the stop rod to which the pair of first pillow blocks are fixed extends in a direction away from the second sliding member to form a cantilever, and the stop boss is fixed at the end of the cantilever.

[0007] In another specific embodiment of the present invention, there are two first slide grooves, which are arranged on both sides of the rotation center of the turntable. The stop rod has an action arm extending perpendicular to the sliding direction of the stop rod. One of the pair of first pillow blocks, the stop boss and the other of the pair of first pillow blocks are arranged on the action arm in sequence, and the pair of first pillow blocks are respectively accommodated in a corresponding first slide groove.

[0008] In another specific embodiment of the present invention, the second sliding member includes a second pillow block fixed on the stop rod and a second slide groove opened on the bracket and extending along the sliding direction of the stop rod, the second pillow block is accommodated in the second slide groove, and the distance between the first pillow block and the stop boss is smaller than the distance between the second pillow block and the first pillow block.

[0009] In another specific embodiment of the present invention, the stop boss is located on the perpendicular midline of the connecting line segment of a pair of first pillow blocks.

[0010] In another specific embodiment of the present invention, the stop rod is L-shaped, the second pillow block is located on the vertical rod section of the L-shaped rod, the first pillow block and the stop boss are located on the transverse rod section of the L-shaped rod, and the cantilever or action arm is formed on the end of the transverse rod section of the L-shaped rod away from the vertical rod section.

[0011] In another specific embodiment of the present invention, an actuated arm is formed on the transverse rod section of the stop rod located between the first pillow block and the second pillow block, and the operating mechanism also includes a driving device. When the turntable is in the first rotation position corresponding to the switch closing, the driving device pushes the actuated arm to keep it disengaged from the turntable. During the process of the turntable rotating from the first rotation position corresponding to the switch closing to the second rotation position corresponding to the switch opening, the driving device releases the push on the actuated arm, and the stop rod contacts the contour surface of the turntable.

[0012] In a more specific embodiment of the present invention, the contour surface of the turntable includes a circumferential contour surface and a groove recessed on the circumferential contour surface. An elastic member is provided between the stop rod and the bracket. When the driving device is in the first position, the driving device pushes the driven arm, and the stop rod remains disengaged from the turntable at the first rotation position. During the movement of the driving device to the second position, the driving device drives the turntable to rotate toward the second rotation position and releases the stop rod. Under the action of the elastic member, the stop boss remains in contact with the circumferential contour surface of the turntable. When the turntable rotates to the second rotation position corresponding to the switch opening, the stop boss enters the groove to stop the turntable at the second rotation position.

[0013] Due to the adoption of the above-mentioned structure, the present invention has the following beneficial effects: First, in the switch operating mechanism, since the first sliding member is provided with a pair of first shaft blocks, the pair of first shaft blocks are respectively arranged on both sides of the stop boss, and the pair of first shaft blocks can share the force on the single shaft block and the bracket in the previous structure, so that the shaft blocks and the bracket are evenly stressed, thereby improving the service life of the shaft blocks and the bracket, and the service life of the operating mechanism is also improved accordingly; second, when the stop boss enters the groove on the turntable to lock the turntable, the deflection angle of the stop rod caused by the reaction force of the turntable is effectively reduced, and the locking accuracy of the stop rod is improved; third, the effect of improving the overall service life of the operating mechanism and improving the locking accuracy is achieved only by arranging a pair of first shaft blocks in the first sliding member. Therefore, the structure is extremely simple and the effect is extremely beneficial. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the operating mechanism when the dual power transfer switch is in the first power on position in one embodiment of the present utility model;

[0015] Figure 2 This is a schematic diagram of the operating mechanism when the dual power transfer switch is in the open position in one embodiment of the present invention;

[0016] Figure 3 This is a schematic diagram of the operating mechanism when the dual power transfer switch is in the open position in another embodiment of the present invention.

[0017] In the figure: 1. bracket, 11. connecting rod sliding groove, 12. driving rod sliding groove, 13. limiting boss; 2. turntable, 21. contour surface, 211. circumferential contour surface, 212. groove, 23. fixed driving shaft, 24. movable driving shaft; 3. stop rod, 30. cantilever, 300. action arm, 31. stop boss, 32. driven arm; 4. first sliding member, 41. first shaft block, 42. first sliding groove; 5. second sliding member, 51. second shaft block, 52. second sliding groove; 6. elastic member; 7. driving device, 71. electromagnet, 72. connecting rod, 73. driving rod, 731. driving end face, 732. driving shaft. DETAILED DESCRIPTION

[0018] The specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings. However, the applicant's description of the embodiments does not limit the technical solution. Any changes in form rather than substance based on the concept of the present invention should be regarded as within the scope of protection of the present invention.

[0019] In the following description, all concepts related to directionality or orientation such as up, down, left, right, front and back are based on the positions shown in the corresponding drawings. They are only used to facilitate the description of the technical solution provided by the present invention and to simplify the description in conjunction with the drawings. Therefore, they should not be understood as a special limitation on the technical solution provided by the present invention.

[0020] See also Figure 1 The present invention relates to a switch operating mechanism. The switch described herein may be a circuit breaker, an isolating switch, a dual power automatic transfer switch, etc. If it is a circuit breaker, the turntable in the switch operating mechanism described in the present invention may be a movable contact shaft. If it is an isolating switch, the turntable in the switch operating mechanism described in the present invention may be a movable contact bracket. If it is a dual power automatic transfer switch, the turntable in the switch operating mechanism described in the present invention may be a movable contact bracket or a rotation output of the operating mechanism. The following description will be made using the dual power automatic transfer switch as an example.

[0021] The dual power automatic transfer switch described in the present invention includes an operating mechanism and an actuator. The operating mechanism provided in the present invention includes a bracket 1, a drive device 7, a rotary disk 2, and a stop rod 3. The actuator provided in the present invention can be a pair of circuit breakers, respectively disposed on the left and right sides of the operating mechanism (a conventional arrangement, not shown in the figure). Specific positions include: the left circuit breaker is closed and the right circuit breaker is open, which is the first power closed position of the dual power automatic transfer switch; both circuit breakers are open, which is the double open position of the dual power automatic transfer switch; and the left circuit breaker is open and the right circuit breaker is closed, which is the second power closed position of the dual power automatic transfer switch. Of course, the actuator of the dual power automatic transfer switch is not limited to the above-mentioned form. It can also be a single-pole double-throw structure with a moving contact in the middle and a static contact on each side. When the moving contact contacts and closes with one static contact, it is the first power closed position; when the moving contact rotates to the middle position between the pair of static contacts, it is the double open position; and when the moving contact closes with the other static contact, it is the second power closed position. The utility model takes a dual-power automatic transfer switch including a pair of circuit breakers as an actuator as an example to illustrate the improvement of the operating mechanism structure.

[0022] The driving device 7 includes an electromagnet 71, which is fixed to the bracket 1 of the operating mechanism and has a moving iron core, a static iron core, a coil, and a spring. When the coil is de-energized, the moving iron core is released downward, and the driving device 7 is in the first position. When the coil is energized, the moving iron core and the static iron core are attracted together, and the moving iron core is attracted upward, and the driving device 7 is in the second position. The driving device 7 also includes a connecting rod 72 and a pair of driving rods 73. The connecting rod 72 is slidably mounted on the bracket 1 through a pair of connecting rod sliding grooves 11 provided on the bracket 1 and is fixedly connected to the moving iron core. The pair of driving rods 73 are slidably mounted on the bracket 1 through a pair of driving rod sliding grooves 12 provided on the bracket 1 and are arranged in a mirror image on both sides of the turntable 2. One end of the driving rod 73 is hinged to the connecting rod 72, and the other end is provided with a driving end face 731 that cooperates with the turntable 2 and a driving shaft 732 for pushing the stop rod 3.

[0023] In this embodiment, the turntable 2 has Figure 1 The left circuit breaker is closed and the dual power automatic transfer switch is in the first rotation position of the first power supply. Figure 2The second rotational position, corresponding to both side circuit breakers being open and the dual power automatic transfer switch being in the double open position, is, in this embodiment, the middle position of the turntable 2. There is also a third rotational position, corresponding to the right circuit breaker being closed and the dual power automatic transfer switch being in the second power closed position. The turntable 2 is generally disc-shaped, and its side profile 21 includes a circumferential profile 211 and a groove 212 recessed on the circumferential profile 211. Specifically, the groove 212 extending toward the rotational center is provided on the circumferential profile 211 at a position corresponding to the second rotational position. Furthermore, the turntable 2 includes a pair of symmetrically arranged fixed drive shafts 23 and a pair of symmetrically arranged movable drive shafts 24. The fixed drive shafts 23 and movable drive shafts 24 are configured to mate with the drive end surface 731 of the drive rod 73.

[0024] The stop rod 3 is slidably set on the bracket 1 through a pair of first sliding members 4 and second sliding members 5 arranged at intervals. A stop boss 31 is provided on the stop rod 3. When the turntable 2 rotates to the position corresponding to the switch opening, the stop boss 31 cooperates with the contour surface 21 of the turntable 2 to lock the turntable 2 in this position.

[0025] The first sliding member 4 includes a pair of first shaft blocks 41 fixed on the stop rod 3 and a first sliding groove 42 opened on the bracket 1 and extending along the sliding direction of the stop rod 3. The pair of first shaft blocks 41 are accommodated in the first sliding groove 42, and the vertical projection of the stop boss 31 on the line connecting the pair of first shaft blocks 41 is located between the pair of first shaft blocks 41.

[0026] The second sliding member 5 includes a second pillow block 51 fixed on the stop rod 3 and a second slide groove 52 provided on the bracket 1 and extending in the sliding direction of the stop rod 3. The second pillow block 51 is accommodated in the second slide groove 52. Preferably, in this embodiment, the distance between the first pillow block 41 and the stop boss 31 is smaller than the distance between the second pillow block 51 and the first pillow block 41. Of course, the distance between the first pillow block 41 and the stop boss 31 and the distance between the second pillow block 51 and the first pillow block 41 are not limited to the size relationship given in the above embodiment. The distance between the second pillow block 51 and the first pillow block 41 may also be smaller than or equal to the distance between the first pillow block 41 and the stop boss 31. However, the distance between the stop boss 31 and the first pillow block 41 should be smaller than the distance between the stop boss 31 and the second pillow block 51.

[0027] The stop rod 3 is L-shaped, the second pillow block 51 is located on the vertical rod section of the L-shaped rod, and the first pillow block 41 and the stop boss 31 are located on the horizontal rod section of the L-shaped rod.

[0028] In one embodiment of the first sliding member 4, Figure 1 and Figure 2As shown, there is one first chute 42, which is located on the same side of the rotation center of the turntable 2 as the second sliding member 5. A pair of first bosses 41 are arranged in sequence along the sliding direction of the stop rod 3 and are accommodated in the first chute 42. The end of the stop rod 3 to which the pair of first bosses 41 are fixed extends in a direction away from the second sliding member 5 to form a cantilever 30, and the stop boss 31 is fixed to the end of the cantilever 30. Specifically, the cantilever 30 is formed at the end of the horizontal rod section of the L-shaped rod member of the stop rod 3, away from the vertical rod section.

[0029] In another embodiment of the first sliding member 4, Figure 3 As shown, there are two first chute grooves 42, which are provided on either side of the rotation center of the turntable 2. The stop rod 3 has an actuating arm 300 extending perpendicular to the sliding direction of the stop rod 3. One of the pair of first bosses 41, the stop boss 31, and the other of the pair of first bosses 41 are sequentially arranged on the actuating arm 300. One of the pair of first bosses 41 is respectively accommodated in a corresponding first chute groove 42. Specifically, the actuating arm 300 is formed at the end of the transverse rod section of the L-shaped rod member of the stop rod 3, which is away from the vertical rod section.

[0030] For the above two embodiments, further, the stop boss 31 is located on the perpendicular midline of the connecting line segment of a pair of first axle blocks 41. Figure 2 As shown, along the sliding direction of the stop rod 3, the distance between the first axle platform 41 and the stop boss 31 is equal. Figure 3 As shown, along the sliding direction perpendicular to the stopping rod 3 , the pair of first axle blocks 41 are equidistant from the stopping boss 31 .

[0031] The stop rod 3 is provided with an actuated arm 32 on the transverse rod section between the first and second axle blocks 41 and 51. Figure 1 As shown, when the turntable 2 is in the first rotation position corresponding to the first power on, the driving shaft 732 of the driving device 7 pushes the passive arm 32 to keep it separated from the turntable 2. During the rotation of the turntable 2 from the first rotation position corresponding to the first power on to the second rotation position corresponding to the first power off, the driving shaft 732 of the driving device 7 releases the push on the passive arm 32, and the stop rod 3 contacts the contour surface 21 of the turntable 2.

[0032] An elastic member 6 is provided between the stop rod 3 and the bracket 1 . Furthermore, the elastic member 6 is a tension spring.

[0033] Please continue reading Figures 1 to 2 The working process of a switch operating mechanism described in the utility model is:

[0034] like Figure 1As shown, the dual power automatic transfer switch is in the first power on position, that is, the left circuit breaker is closed and the right circuit breaker is open, the turntable 2 is in the first rotation position, the drive device 7 is in the first position, that is, the coil is de-energized, the drive rod 73 is in the lower position, the drive rod 73 is in contact with the passive arm 32 of the stop rod 3, and the stop rod 3 overcomes the action of the elastic member 6 and is in the lower position and remains separated from the turntable 2. At this time, Figure 1 As shown, the left driving rod 73 of the pair of driving rods 73 has a linkage relationship with the turntable 2 , while the right driving rod 73 of the pair of driving rods 73 has no linkage relationship with the turntable 2 .

[0035] When the dual power automatic transfer switch switches from the first power supply to the second power supply, the driving device 7 moves to the second position, that is, the coil of the electromagnet is energized, the moving iron core is attracted to the static iron core, and the moving iron core drives the driving rod 73 to move upward through the connecting rod 72. Figure 2 As shown, the driving end surface 731 on the left driving rod 73 acts on the fixed driving shaft 23 on the far left of the turntable 2, driving the turntable 2 to rotate clockwise. The turntable 2, as the rotation output of the operating mechanism, drives the transmission mechanism of the dual power automatic transfer switch, thereby driving the left circuit breaker to perform the opening action. At this time, the right circuit breaker remains in the opening state. During this process, under the action of the elastic member 6, the driven arm 32 on the stop rod 3 and the driving shaft 732 on the left driving rod 73 remain in contact and slide upward with the driving rod 73 until the stop boss 31 on the stop rod 3 contacts the circumferential contour surface 211 of the turntable 2. Since the driving rod 73 will continue to move upward with the attraction action of the moving iron core and the static iron core, the driving rod 73 on the left 73 will eventually disengage from the driven arm 32. When the driving rod 73 drives the turntable 2 to continue to rotate clockwise, the stop boss 31 slides relatively on the circumferential contour surface 211. When the turntable 2 rotates to the second rotation position, the corresponding left circuit breaker is driven to the open position, which is the double open position of the dual power automatic transfer switch. In this embodiment, the second rotation position is the middle position of the turntable 2. At this time, the groove 212 is aligned with the stop boss 31. Under the action of the elastic member 6, the stop rod 3 keeps sliding upward, so that the stop boss 31 enters the groove 212, locking the turntable 2. The turntable 2 stops at the middle position, the driving rod 73 reaches the second position, and the limiting boss 13 on the bracket 1 limits the connecting rod 72. Figure 2As shown. When the switch reaches the double-off position and the turntable 2 stops at the second rotational position, the drive device 7 resets, i.e., its electromagnet loses power, the movable and stationary iron cores release and separate, and the drive rod 73 moves downward. The drive shaft 732 on the left side of the drive rod 73 contacts the driven arm 32, driving the stop rod 3 to slide downward, overcoming the force of the elastic member 6. The stop boss 31 exits the groove 212. Since the turntable 2 acts as a rotational output, it is subject to the reaction of its driven object (in this embodiment, the drive lever of the circuit breaker), and the turntable 2 remains in the middle position.

[0036] From the dual power automatic transfer switch in the dual open position, further action is taken. The electromagnet of the drive device 7 is energized again, the moving iron core and the static iron core are attracted, the drive rod 73 moves upward, and the drive end face 731 acts on the movable drive shaft 24 on the left side of the turntable 2, further driving the turntable 2 to rotate clockwise. During this process, the left circuit breaker remains in the open position, while the right circuit breaker moves toward the closed position. Ultimately, the right circuit breaker reaches the closed position, the left circuit breaker remains in the open position, the dual power automatic transfer switch reaches the second power closed position, and the turntable 2 reaches the third rotational position, which corresponds to the right circuit breaker closed position and is symmetrical with the first rotational position corresponding to the left circuit breaker closed position. During the process of the turntable 2 driving the right circuit breaker to close, the stop boss 31 slides relative to the circumferential contour surface 211. Next, the electromagnet loses power, and the movable iron core drives the driving rod 73 to move downward and return to the first position. The driving rod 73 on the left side contacts and pushes the driven arm 32, causing the stop rod 3 to slide downward and disengage from the turntable 2.

[0037] In summary, during the process of switching the dual power automatic transfer switch from the first power supply to the second power supply, the cooperation between the stop rod 3 and the turntable 2 can reliably stop the turntable 2 at the middle position corresponding to the double-split position, and automatically reset through the driving device to complete the unlocking action.

[0038] In the switch operating mechanism of the present invention, the first sliding member 4 is provided with a pair of first axle blocks 41, and the vertical projection of the stop boss 31 on the line connecting the pair of first axle blocks 41 is located between the pair of first axle blocks 41. Figure 1 、 Figure 2 In the embodiment 1 shown, in the sliding direction of the stop rod 3, that is, in the extending direction of the vertical rod section of the L-shaped stop rod 3, the stop boss 31 is between the pair of first pillow blocks 41, that is, one of the pair of first pillow blocks 41, the stop boss 31 and the other of the pair of first pillow blocks 41 are arranged in sequence. Figure 3In the second embodiment shown, in a direction perpendicular to the sliding direction of the stop rod 3, i.e., the extending direction of the transverse rod section of the L-shaped stop rod 3, the stop boss 31 is located between the pair of first pillow blocks 41, i.e., one of the pair of first pillow blocks 41, the stop boss 31, and the other of the pair of first pillow blocks 41 are arranged in sequence. Because the first sliding member is provided with a pair of first pillow blocks, the pair of first pillow blocks are disposed on either side of the stop boss. These first pillow blocks can share the force applied to a single pillow block and bracket in conventional structures, ensuring uniform force between the pillow blocks and the bracket, thereby improving the lifespan of the pillow blocks and the bracket, and correspondingly improving the lifespan of the operating mechanism. This effectively reduces the deflection angle of the stop rod caused by the reaction force of the turntable when the stop boss enters the groove on the turntable to lock the turntable, thereby improving the locking accuracy of the stop rod. The overall lifespan of the operating mechanism and the locking accuracy are improved by simply providing a pair of first pillow blocks in the first sliding member. Therefore, the structure is extremely simple and the effects are extremely beneficial.

Claims

1. A switch operating mechanism, comprising a bracket (1), a rotary disc (2) and a stop rod (3), wherein the stop rod (3) is slidably arranged on the bracket (1) via a pair of first sliding members (4) and second sliding members (5) arranged at intervals, and the stop rod (3) is provided with a stop boss (31). When the rotary disc (2) rotates to a position corresponding to a switch opening, the stop boss (31) cooperates with a contour surface (21) of the rotary disc (2) to lock the rotary disc (2) in the position, wherein: The first sliding member (4) includes a pair of first pillow blocks (41) fixed on the stop rod (3) and a first slide groove (42) provided on the bracket (1) and extending along the sliding direction of the stop rod (3); the pair of first pillow blocks (41) are accommodated in the first slide groove (42); and the vertical projection of the stop boss (31) on the line connecting the pair of first pillow blocks (41) is located between the pair of first pillow blocks (41).

2. A switch operating mechanism according to claim 1, characterized in that: The number of the first sliding groove (42) is one, and the first sliding groove (42) and the second sliding member (5) are located on the same side of the rotation center of the turntable (2). A pair of first shaft blocks (41) are arranged in sequence along the sliding direction of the stop rod (3). The end portions of the pair of first shaft blocks (41) are fixed on the stop rod (3) and extend in a direction away from the second sliding member (5) to form a cantilever (30). The stop boss (31) is fixed to the end portion of the cantilever (30).

3. The switch operating mechanism according to claim 1, characterized in that: There are two first slide grooves (42), which are arranged on both sides of the rotation center of the turntable (2). The stop rod (3) has an action arm (300) extending along a direction perpendicular to the sliding direction of the stop rod (3). One of a pair of first shaft blocks (41), the stop boss (31) and the other of the pair of first shaft blocks (41) are arranged on the action arm (300) in sequence. The pair of first shaft blocks (41) are respectively accommodated in a corresponding first slide groove (42).

4. A switch operating mechanism according to claim 2 or 3, characterized in that: The second sliding member (5) includes a second pillow block (51) fixed on the stop rod (3) and a second slide groove (52) provided on the bracket (1) and extending along the sliding direction of the stop rod (3); the second pillow block (51) is accommodated in the second slide groove (52); the distance between the first pillow block (41) and the stop boss (31) is smaller than the distance between the second pillow block (51) and the first pillow block (41).

5. The switch operating mechanism according to claim 1, characterized in that: The stop boss (31) is located on the perpendicular midline of the connecting line segment of a pair of first axle bosses (41).

6. A switch operating mechanism according to claim 4, characterized in that: The stop rod (3) is L-shaped, the second pillow block (51) is located on the vertical rod section of the L-shaped rod, the first pillow block (41) and the stop boss (31) are located on the transverse rod section of the L-shaped rod, and the cantilever (30) or the action arm (300) is formed on the end of the transverse rod section of the L-shaped rod away from the vertical rod section.

7. A switch operating mechanism according to claim 6, characterized in that: The stop rod (3) is provided with an actuated arm (32) on a transverse rod section located between the first shaft platform (41) and the second shaft platform (51). The operating mechanism further comprises a driving device (7). When the turntable (2) is located at a first rotation position corresponding to a closed switch, the driving device (7) pushes the actuated arm (32) to keep it separated from the turntable (2). When the turntable (2) rotates from the first rotation position corresponding to a closed switch to the second rotation position corresponding to an open switch, the driving device (7) releases the push on the actuated arm (32), and the stop rod (3) contacts the contour surface (21) of the turntable (2).

8. A switch operating mechanism according to claim 7, characterized in that: The profile surface (21) of the turntable (2) includes a circumferential profile surface (211) and a groove (212) concavely arranged on the circumferential profile surface (211); an elastic member (6) is provided between the stop rod (3) and the bracket (1); when the driving device (7) is located at the first position, the driving device (7) pushes the driven arm (32), and the stop rod (3) remains disengaged from the turntable (2) located at the first rotation position; when the driving device (7) moves to the second position, the driving device (7) drives the turntable (2) to rotate to the second rotation position and releases the stop rod (3); under the action of the elastic member (6), the stop boss (31) remains in contact with the circumferential profile surface (211) of the turntable (2); when the turntable (2) rotates to the second rotation position corresponding to the switch opening, the stop boss (31) enters the groove (212) to stop the turntable (2) at the second rotation position.

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