Operating mechanism and three-position switch

Abstract

The present disclosure discloses an operating mechanism and a three-position switch. The three-position switch includes the operating mechanism. The operating mechanism includes a motor, a first transmission mechanism, a second transmission mechanism, a third transmission mechanism, and an output gear. The first transmission mechanism is connected to the motor and rotates under the drive of the motor. The second transmission mechanism is connected to the first transmission mechanism in a transmission connection, and the first transmission mechanism drives the second transmission mechanism to rotate. The second transmission mechanism is connected to a connecting shaft, and when the second transmission mechanism rotates, the connecting shaft is driven to rotate. The third transmission mechanism is connected to the connecting shaft, and when the connecting shaft rotates, the third transmission mechanism is driven to rotate. The output gear is connected to the third transmission mechanism in a transmission connection, and when the third transmission mechanism rotates, the output gear is driven to rotate. The first transmission mechanism and the second transmission mechanism are mounted on the upper mounting plate, and the third transmission mechanism is mounted on the lower mounting plate. The operating mechanism has a compact structure and a small size.

Description

Technical Field

[0001] The present disclosure relates to power transmission and distribution equipment in an electric power system, and in particular to an operating mechanism and a three-position switch. Background Art

[0002] Three-position switches are commonly used in high-voltage power transmission and distribution equipment. They combine the functions of both an isolating switch and an earthing switch. Typically, a three-position switch features an earthing contact, a static contact, and a moving contact, with the moving contact typically mounted on a movable guide rod. An operating mechanism drives the movable guide rod, positioning the moving contact in three different positions: the closed position (connecting the main disconnects), the isolated position (disconnecting the main disconnects), and the earthing position (grounding). The operating mechanism thus enables the three-position switch to function in three different states.

[0003] Traditionally, most operating mechanisms use a dual-motor dual-screw solution, which is large in size and complex in structure. Summary of the Invention

[0004] In order to solve the problems of large size and complex structure of operating mechanisms in traditional technologies, the present disclosure provides an operating mechanism and a three-position switch.

[0005] The present invention discloses an operating mechanism, comprising:

[0006] Motor;

[0007] a first transmission mechanism connected to the motor and rotating under the drive of the motor;

[0008] a second transmission mechanism, in transmission connection with the first transmission mechanism, the first transmission mechanism driving the second transmission mechanism to rotate, the second transmission mechanism being connected to a connecting shaft, and driving the connecting shaft to rotate when the second transmission mechanism rotates;

[0009] a third transmission mechanism connected to the connecting shaft, and driving the third transmission mechanism to rotate when the connecting shaft rotates;

[0010] an output gear, which is in transmission connection with the third transmission mechanism and drives the output gear to rotate when the third transmission mechanism rotates;

[0011] The first transmission mechanism and the second transmission mechanism are installed on the upper mounting plate, the third transmission mechanism is installed on the lower mounting plate, and the connecting shaft connects the upper mounting plate and the lower mounting plate.

[0012] Furthermore, the second transmission mechanism includes a turbine and a worm, the turbine is meshed with the worm, and the third transmission mechanism includes a driving wheel and a driven wheel meshed with the driving wheel, the driving wheel is coaxially arranged with the turbine and realizes coaxial rotation through the connecting shaft, and the driven wheel is meshed with the output gear.

[0013] Furthermore, both the driving wheel and the driven wheel are provided with a check arc and gear teeth. When the check arc of the driving wheel cooperates with the check arc on the driven wheel, the driven wheel stops rotating and is locked, so that the driven wheel stops at a specified position. When the gear teeth of the driving wheel mesh with the gear teeth of the driven wheel, the driving wheel drives the driven wheel to rotate.

[0014] Furthermore, the driven wheel is provided with three sections of check arcs at intervals, corresponding to the closing position, the isolating position and the grounding position of the three-position switch respectively, and the gear teeth of the driven wheel are provided between any two sections of the check arcs;

[0015] The driving wheel is provided with a section of the check arc and a section of the gear teeth;

[0016] When the check arc of the driven wheel cooperates with the check arc of the driving wheel and is locked, the three-position switch is driven to maintain in the closing position, the isolating position or the grounding position.

[0017] Furthermore, the arc length of the gear teeth arranged on the driven wheel and the arc length of the gear teeth arranged on the driving wheel are determined according to the movement time and the rest time of the driven wheel.

[0018] Furthermore, the arc length of the teeth arranged on the driving wheel is 1 / 6 of the circumference of the driven wheel, so that every time the driving wheel rotates 360 degrees, the driven wheel is driven to rotate 60 degrees.

[0019] Furthermore, a limiting member is installed on the driven wheel, and a limiting groove is provided on the upper mounting plate. The head end of the limiting member is located in the limiting groove, and the limiting member slides in the limiting groove as the driven wheel rotates.

[0020] Furthermore, the shape of the limiting groove is adapted to the sliding track of the limiting member.

[0021] Furthermore, a shaft extension is provided at the front end of the worm, and the shaft extension is a hexagonal shaft. When the motor is not powered, the worm is driven to rotate by an operating handle to achieve manual control.

[0022] Furthermore, the operating mechanism further comprises:

[0023] A driving bevel gear is coaxially arranged with the driven wheel, the driving bevel gear and the driven wheel are both connected to a rotating shaft, and the driven wheel drives the driving bevel gear to rotate via the rotating shaft;

[0024] A driven bevel gear meshes with the driving bevel gear and rotates driven by the driving bevel gear;

[0025] An auxiliary switch transmission shaft is connected to the driven bevel gear and rotates under the drive of the driven bevel gear;

[0026] A transmission crank arm is fixedly connected to the auxiliary switch transmission shaft and rotates with the rotation of the auxiliary switch transmission shaft;

[0027] The auxiliary switch module is connected to the transmission crank arm through a four-bar linkage and rotates under the drive of the transmission crank arm.

[0028] Furthermore, an indicator board is connected to the auxiliary switch module, and at least two indicator lights of different colors are provided on the indicator board. The auxiliary switch module and the indicator board are coaxially arranged. When the auxiliary switch module rotates to realize switching on and off, the indicator board is driven to rotate, so that the indicator light indicating the corresponding working position of the three-position switch on the indicator board rotates to the specified position.

[0029] Furthermore, the operating mechanism further includes:

[0030] a limiting plate connected to the connecting shaft and rotatable around the connecting shaft;

[0031] A micro switch, electrically connected to the motor, for controlling the start and stop of the motor;

[0032] When the micro switch is not pressed, the pressing handle of the micro switch presses the limit plate; when the micro switch is pressed, the pressing handle pops open, and the limit plate detaches from the micro switch. The limit plate rotates around the connecting shaft for one circle and then contacts the micro switch, causing the micro switch to generate a current or voltage pulse for starting or shutting down the motor.

[0033] Furthermore, the first transmission mechanism includes a motor gear and a transmission gear, the motor gear is connected to the output shaft of the motor, the transmission gear is engaged with the motor gear, the transmission gear is coaxially arranged with the worm, the motor drives the motor gear to rotate, the motor gear drives the transmission gear to rotate, the transmission gear drives the worm to rotate, and the worm drives the turbine to rotate.

[0034] The present disclosure further provides a three-position switch, comprising a housing, a switch body disposed within the housing, and the above-mentioned operating mechanism, wherein the operating mechanism is connected to the input shaft of the switch body to drive the switch body to move, thereby realizing position switching of the three-position switch among closing, isolating, or grounding.

[0035] The technical solutions provided by the embodiments of the present disclosure may have the following beneficial effects:

[0036] The operating mechanism disclosed herein includes a motor, a first transmission mechanism, a second transmission mechanism, a third transmission mechanism, and an output gear. The first transmission mechanism is connected to the motor and rotates when driven by the motor. The second transmission mechanism is connected to the first transmission mechanism, driving the second transmission mechanism in rotation. The second transmission mechanism is connected to a connecting shaft, and rotation of the second transmission mechanism drives the connecting shaft in rotation. The third transmission mechanism is connected to the connecting shaft, and rotation of the connecting shaft drives the third transmission mechanism in rotation. The output gear is connected to the third transmission mechanism, and rotation of the third transmission mechanism drives the output gear in rotation. The output gear drives the switch body of the three-position switch to switch between the three-position switch operating positions. The first transmission mechanism drives the second transmission mechanism in rotation, which in turn drives the third transmission mechanism in rotation, and the third transmission mechanism drives the output gear in rotation. Through three-stage transmission, the switch body moves. The first and second transmission mechanisms are mounted on an upper mounting plate, and the third transmission mechanism is mounted on a lower mounting plate. The second and third transmission mechanisms are coaxially arranged, and transmission is achieved via a connecting shaft connecting the upper and lower mounting plates. In this way, the first transmission mechanism, the second transmission mechanism and the third transmission mechanism are arranged in two layers, and the transmission of the upper and lower transmission mechanisms is realized through the connecting shaft, so that the structure of the operating mechanism is compact and the volume is small, thereby realizing product miniaturization and adapting to the needs of miniaturization development of modern high-voltage distribution equipment.

[0037] The disclosed three-position switch includes a housing, a switch body disposed within the housing, and the aforementioned operating mechanism. The operating mechanism is connected to the input shaft of the switch body to drive the switch body to switch between closed, isolated, or grounded positions. By employing the aforementioned operating mechanism, the three-position switch is reduced in size, facilitating product miniaturization and meeting the growing demand for miniaturization in modern high-voltage power distribution equipment.

[0038] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0040] Figure 1 This is a front view of the operating mechanism of the present invention.

[0041] Figure 2 It is a side view of the operating mechanism of the present disclosure.

[0042] Figure 3 for Figure 1 Cross-sectional view of AA in the figure.

[0043] Figure 4 for Figure 2 Cross-sectional view of the BB.

[0044] Figure 5 This is a schematic diagram of the three-dimensional structure of the operating mechanism disclosed herein installed in the housing of a three-position switch.

[0045] Figure 6 This is a structural diagram of the cooperation between the driven wheel and the driving wheel of the operating mechanism when the three-position switch is in the isolation position.

[0046] Figure 7 This is a structural diagram of the cooperation between the driven wheel and the driving wheel of the operating mechanism when the three-position switch is in the closed position.

[0047] Figure 8 This is a structural diagram of the cooperation between the driven wheel and the driving wheel of the operating mechanism when the three-position switch is in the grounded position. DETAILED DESCRIPTION

[0048] In order to further illustrate the principle and structure of the present disclosure, preferred embodiments of the present disclosure are now described in detail with reference to the accompanying drawings.

[0049] The present disclosure provides an operating mechanism, which can be applied to a three-position switch, in particular a three-position switch for a 110kV gas-insulated metal-enclosed switchgear (GIS). Figures 1 to 4 As shown, Figure 1 This is the main view of the operating mechanism of the present disclosure. Figure 2 This is a side view of the operating mechanism of the present disclosure. Figure 3 for Figure 1 The cross-sectional view of AA in the figure, Figure 4 for Figure 2In the cross-sectional view along line BB, the operating mechanism 100 includes a motor 10, a first transmission mechanism 20, a second transmission mechanism 30, a third transmission mechanism 40, and an output gear 50. The motor 10 is connected to the first transmission mechanism 20 and rotates under the drive of the motor 10. The second transmission mechanism 30 is in transmission connection with the first transmission mechanism 20, driving the second transmission mechanism 30 to rotate. The second transmission mechanism 30 is mounted on a connecting shaft 60, and rotation of the second transmission mechanism 30 drives rotation of the connecting shaft 60. The third transmission mechanism 40 is connected to the connecting shaft 60, so that rotation of the connecting shaft 60 drives rotation of the third transmission mechanism 40. The output gear 50 is in transmission connection with the third transmission mechanism 40, and rotation of the third transmission mechanism 40 drives rotation of the output gear 50. The first transmission mechanism 20 and the second transmission mechanism 30 are mounted on an upper mounting plate 101, while the motor 10 and the third transmission mechanism 40 are mounted on a lower mounting plate 102.

[0050] Combine Figure 5 , which is a schematic diagram of the three-dimensional structure of the operating mechanism of the present disclosure installed in the housing of a three-position switch. The three-position switch 1 includes the above-mentioned operating mechanism 100, a switch body 200, and a housing 300. The operating mechanism 100 and the switch body 200 are installed in the housing 300. The output gear 40 of the operating mechanism is connected to the input shaft of the switch body 200, thereby driving the switch body 200 to achieve the switching of the three-position switch between the closed, isolated, or grounded positions, or the opening and closing functions of the isolation or grounding switch.

[0051] The three-position switch 1 can be used in 110kV gas-insulated metal-enclosed switchgear (GIS). It integrates the functions of both an isolating switch and an earthing switch. The switch body 200 is equipped with a movable contact, a stationary contact, and a grounding contact. Closing, isolating, and grounding of the three-position switch 1 are achieved by moving the movable contact. This achieves a mechanical lockout, preventing the earthing switch from closing while the main circuit is energized.

[0052] The first transmission mechanism 20 drives the second transmission mechanism 30 to rotate, which in turn drives the third transmission mechanism 40 to rotate, which in turn drives the output gear 50 to rotate. Through this three-stage transmission, the switch body 200 moves. Furthermore, the first and second transmission mechanisms 20, 30 are mounted on the upper mounting plate 101, while the third transmission mechanism 40 is mounted on the lower mounting plate 102. The second and third transmission mechanisms 30, 40 are coaxially arranged, and transmission is achieved via a connecting shaft 60 connecting the upper and lower mounting plates 101, 102. Thus, the first, second, and third transmission mechanisms 20, 30, and 40 are arranged in two layers, with transmission between the upper and lower layers achieved via the connecting shaft 60. This makes the operating mechanism 100 compact and small, thus achieving product miniaturization and meeting the needs of the development of miniaturized modern high-voltage power distribution equipment.

[0053] Specifically, such as Figure 1 As shown, the first transmission mechanism 20 includes a motor gear 21 and a transmission gear 22. The motor gear 21 is connected to the output shaft of the motor 10, and the motor gear 21 and the transmission gear 22 are meshed. The second transmission mechanism 30 includes a worm 31 and a turbine 32. The turbine 32 is meshed with the worm 31. The transmission gear 22 is coaxially arranged with the worm 31. More specifically, the transmission gear 22 is directly sleeved on one end of the worm 31. When the transmission gear 22 rotates, it drives the worm 31 to rotate. The motor 10 drives the motor gear 21 to rotate, the motor gear 21 drives the transmission gear 22 to rotate, the transmission gear 22 drives the worm 31 to rotate, and the worm 31 drives the turbine 32 to rotate.

[0054] It should be noted that the motor gear 21 and the transmission gear 22 of the second transmission mechanism 20 can be replaced by transmission mechanisms such as bevel gears or spur gears.

[0055] like Figure 3 and Figure 4 As shown, the third transmission mechanism 40 includes a driving wheel 41 and a driven wheel 42 meshing with the driving wheel 41. The driven wheel 42 meshes with the output gear 50. The driving wheel 41 is coaxially arranged with the turbine 32 and rotates coaxially therewith via a connecting shaft 60. The connecting shaft 60 extends through the upper mounting plate 101, with one end inserted into a groove in the lower mounting plate 102. This end of the connecting shaft 60 is restrained and rotatable within the groove. The other end of the connecting shaft 60 is fixed to the turbine 32 via bolts or screws. When the turbine 32 rotates, the connecting shaft 60 rotates with the turbine 32 about its own central axis. This, in turn, causes the driving wheel 41, which is fixed to the connecting shaft 60, to rotate. The rotation of the driving wheel 41 drives the meshed driven wheel 42 to rotate, which in turn drives the output gear 50 to rotate.

[0056] The first transmission mechanism 20, the second transmission mechanism 30 and the third transmission mechanism 40 realize the rotation of the output gear 50 through the engagement between gears or the engagement between worm gears. Compared with the traditional transmission method using a screw nut, the transmission mechanism disclosed in the present invention has a simplified structure, occupies a small space, is easy to assemble, and greatly reduces manufacturing and assembly costs.

[0057] The outer edge of the driving wheel 41 is provided with a check arc 411 and gear teeth 412. Correspondingly, the outer edge of the driven wheel 42 is provided with a check arc 421 and gear teeth 422. When the check arc 411 of the driving wheel 41 engages with the check arc 421 of the driven wheel 42, the driven wheel 42 stops rotating and locks in a specified position, while the driving wheel 41 continues rotating. When the gear teeth 412 of the driving wheel 41 mesh with the gear teeth 422 of the driven wheel 42, the driving wheel 41 drives the driven wheel 42 to rotate.

[0058] Three check arcs 421 are arranged at intervals on the driven wheel 42, corresponding to the closed position, disconnected position, and grounded position of the three-position switch. Gear teeth 422 are arranged between any two check arcs 421. A check arc 411 and a gear tooth 412 are provided on the driving wheel 41. The arc length of the gear teeth arranged on the driven wheel 42 and the arc length of the gear teeth arranged on the driving wheel 41 are determined according to the movement time and rest time of the driven wheel 42. Specifically, when processing the driven wheel 42 and the driving wheel 41, meshing gear teeth are first processed on the driving wheel 41 and the driven wheel 42 according to the movement time and rest time of the driven wheel 42, and then the remaining parts are processed into check arcs.

[0059] The radius of the driven wheel 42 is larger than that of the driving wheel 41. The arc length of the gear teeth 412 arranged on the driving wheel 41 is 1 / 6 of the circumference of the driven wheel 41, so that every 360-degree rotation of the driving wheel 41 drives the driven wheel 42 to rotate 60 degrees.

[0060] Combine Figures 6 to 8 As shown, Figures 6 to 8 The following diagrams respectively show the structure of the cooperation between the driven wheel and the driving wheel of the operating mechanism when the three-position switch is in the isolation position, the closing position and the grounding position. When the driving wheel 41 drives the driven wheel 42 to rotate to the position of the check arc 421 of the driven wheel 42, the driven wheel 42 stops, and the check arc 411 of the driving wheel 41 and the check arc of the driven wheel 41 cooperate and lock with each other, so that the driven wheel 41 stops at the specified position, driving the three-position switch to reliably maintain the working positions corresponding to the closing position, the isolation position and the grounding position.

[0061] The shape of the check arc 411 of the driving wheel 41 is similar to the outer peripheral contour of the driving wheel 41, and the check arc 421 of the driven wheel 42 is recessed toward the center axis direction of the driven wheel 42, so that the protruding check arc 411 of the driving wheel 41 just sinks into the recessed check arc 421 of the driven wheel 42 to achieve fit.

[0062] Specifically, such as Figure 6 As shown, the three-position switch is in the isolation position. The first check arc 421a of the driven wheel 41 cooperates with the check arc 411 of the driving wheel 41 to lock the three-position switch in the isolation position, that is, the moving contact of the three-position switch is isolated from the ground contact and the static contact. The driving wheel 41 continues to rotate, and when the gear 412 of the driving wheel 41 rotates to mesh with the gear 422 of the driven wheel 42, the driven wheel 42 rotates again. When the driven wheel 42 rotates to Figure 7 When the second check arc 421b is shown, the driven wheel 42 stops, and the second check arc 421b of the driven wheel 41 cooperates with the check arc 411 of the driving wheel 41. The driven wheel 42 is locked at the second check arc 421b, so that the moving contact of the three-station operation is kept in the closed position. The motor 10 is reversed, and the driving wheel 41 drives the driven wheel 42 to reverse. When the check arc 411 of the driving wheel 41 cooperates with the first check arc 421a of the driven wheel 42 again, the moving contact of the three-station operation stops in the isolated position again. The driving wheel 41 continues to rotate, and when the gear teeth 412 of the driving wheel 41 rotate to mesh with the gear teeth 422 of the driven wheel 42, the driven wheel 42 rotates again. When the driven wheel 42 rotates to Figure 8 When the third check arc 421c is shown, the driven wheel 42 stops, and the third check arc 421c of the driven wheel 41 cooperates with the check arc 411 of the driving wheel 41. The driven wheel 42 is positioned and locked at the third check arc 421c, so that the moving contact of the three-station operation is kept in the grounded position.

[0063] Since the three check arcs of the driven wheel 42 correspond to the three working positions of the three-position switch (i.e., the closed position, the isolated position and the grounding position), and the first check arc 412a corresponding to the isolated position is set in the middle of the other two check arcs, therefore, no matter whether the three-position switch is in the grounding position or the closed position, it must pass through the isolated position before it can be switched to the grounding position or the closed position. Therefore, it can effectively prevent the three positions from being connected in pairs at the same time, has good reliability, can prevent misoperation, and realizes mechanical interlocking from a structural perspective.

[0064] Furthermore, the front end of the worm 31 is provided with an extension shaft 33. The extension shaft 33 is a hexagonal shaft. When the motor 10 is not powered, the worm 31 can be rotated by operating the handle to achieve manual control.

[0065] Furthermore, a limiting member 43 is installed on the driven wheel 42. Specifically, the limiting member 43 is installed at the first check arc 421a. Figure 1 As shown, the upper mounting plate 101 is provided with a limiting groove 1011. The head end of the limiting member 43 is located within the limiting groove 1011, and the limiting member 43 slides within the limiting groove 1011 as the driven wheel 42 rotates. The shape of the limiting groove 1011 is adapted to the sliding trajectory of the limiting member 43. Specifically, the limiting groove 1011 is crescent-shaped. Specifically, the limiting member 43 can be a bolt or a screw.

[0066] In addition, the limiting member 43 may also be installed at the second check arc 421 b or the third check arc 421 c , and the position of the upper limit groove on the upper mounting plate 101 also changes according to the installation position of the limiting member 43 .

[0067] The arrangement of the limiting groove 1011 and the limiting member 43 can prevent manual misoperation.

[0068] like Figure 1 and Figure 3 As shown, the operating mechanism 100 further includes a driving bevel gear 71 , a driven bevel gear 72 , an auxiliary switch module 75 , an auxiliary switch transmission shaft 73 and a transmission crank arm 74 .

[0069] The driving bevel gear 74 is coaxially arranged with the driven pulley 42. Both the driving bevel gear 71 and the driven pulley 42 are connected to a rotating shaft 77. The rotating shaft 77 extends through the upper mounting plate 101, with one end inserted into a groove in the lower mounting plate 102. This end of the rotating shaft 77 is restrained and rotatable within the groove. The other end of the rotating shaft 77 is fixed to the driving bevel gear 74 with bolts or screws. When the driven pulley 42 rotates, the rotating shaft 77 rotates with the driven pulley 42 about its own central axis, thereby rotating the driving bevel gear 74, which is fixed to the rotating shaft 77.

[0070] The driven bevel gear 72 is meshed with the driving bevel gear 71 and rotates under the drive of the driving bevel gear 71 .

[0071] The auxiliary switch transmission shaft 73 is connected to the driven bevel gear 72. More specifically, the driven bevel gear 72 is directly sleeved and fixed on the auxiliary switch transmission shaft 73. When the driven bevel gear 72 rotates under the drive of the driving bevel gear 71, the auxiliary switch transmission shaft 73 rotates under the drive of the driven bevel gear 72.

[0072] The transmission crank arm 74 is fixedly connected to the auxiliary switch transmission shaft 73 , so that the transmission crank arm 74 rotates along with the rotation of the auxiliary switch transmission shaft 73 .

[0073] The auxiliary switch module 75 is connected to the transmission crank arm 74 via a four-bar linkage, so that the transmission crank arm 74 drives the auxiliary switch module 75 to rotate through the four-bar linkage, thereby realizing the on and off of the auxiliary switch.

[0074] The auxiliary switch module 75 is connected to an indicator plate 76, which is an arc-shaped structure and has at least two indicator lights of different colors. Figure 2 As shown, for example, area 761 of the indicator sign 76 is a red indicator light area, area 762 is a green indicator light area, and area 763 is a yellow indicator light area. Indicator lights of different colors are used to indicate that the three-position switch is in different working states. In actual application, the outer cover of the indicator sign 76 is a shell, and the shell has a display window. The indicator light can only be seen by the outside world when the display window is rotated to the position where the display window is located. The auxiliary switch module 75 and the indicator sign 76 are coaxially arranged. During the process of the auxiliary switch module 75 rotating to realize the on and off, the indicator sign 76 is driven to rotate, so that the indicator light corresponding to the working state of the indicator sign 76 can be rotated to the corresponding position to be displayed to the outside through the display window of the shell.

[0075] Furthermore, the operating mechanism 100 includes a limit plate 81 and a microswitch 82. The limit plate 81 is connected to the connecting shaft 60 and is coaxially arranged with the turbine 32 and the driving wheel 41 via the connecting shaft 60. The limit plate 81 is rotatable about the connecting shaft 60. The microswitch 82 is electrically connected to the motor 10 and is used to control the start and stop of the motor 10.

[0076] When the microswitch 82 is not pressed, the pressing handle 821 of the microswitch 82 presses the limit plate 81, and the limit plate 81 and the limit plate 81 do not separate. When the microswitch 82 is pressed, the pressing handle 821 of the microswitch 82 springs open, and the limit plate 81 disengages from the microswitch 82. After rotating one circle around the connecting shaft 60, the limit plate 81 contacts the microswitch 82 again, causing the microswitch 82 to generate a current or voltage pulse, which is used to start or stop the motor. The microswitch 82 realizes the electric control of the operating mechanism 100.

[0077] The above are only preferred feasible embodiments of the present disclosure and are not intended to limit the protection scope of the present disclosure. Any equivalent structural changes made using the contents of the present disclosure and the drawings are included in the protection scope of the present disclosure.

Claims

1. An operating mechanism, characterized in that: include: Motor; a first transmission mechanism connected to the motor and rotating under the drive of the motor; a second transmission mechanism, in transmission connection with the first transmission mechanism, the first transmission mechanism driving the second transmission mechanism to rotate, the second transmission mechanism being connected to a connecting shaft, and driving the connecting shaft to rotate when the second transmission mechanism rotates; a third transmission mechanism connected to the connecting shaft, and driving the third transmission mechanism to rotate when the connecting shaft rotates; an output gear, which is in transmission connection with the third transmission mechanism and drives the output gear to rotate when the third transmission mechanism rotates; The first transmission mechanism and the second transmission mechanism are mounted on an upper mounting plate, the third transmission mechanism is mounted on a lower mounting plate, and the connecting shaft connects the upper mounting plate and the lower mounting plate; The second transmission mechanism includes a turbine and a worm, the turbine meshing with the worm, and the third transmission mechanism includes a driving wheel and a driven wheel meshing with the driving wheel, the driving wheel and the turbine are coaxially arranged and rotate coaxially through the connecting shaft, and the driven wheel meshes with the output gear; The first transmission mechanism includes a motor gear and a transmission gear. The motor gear is connected to the output shaft of the motor, the transmission gear is engaged with the motor gear, and the transmission gear is coaxially arranged with the worm. The motor drives the motor gear to rotate, the motor gear drives the transmission gear to rotate, the transmission gear drives the worm to rotate, and the worm drives the turbine to rotate.

2. The operating mechanism according to claim 1, characterized in that: Both the driving wheel and the driven wheel are provided with a check arc and gear teeth. When the check arc of the driving wheel cooperates with the check arc on the driven wheel, the driven wheel stops rotating and is locked, so that the driven wheel stops at a specified position. When the gear teeth of the driving wheel mesh with the gear teeth of the driven wheel, the driving wheel drives the driven wheel to rotate.

3. The operating mechanism according to claim 2, characterized in that: The driven wheel is provided with three sections of check arcs at intervals, corresponding to the closing position, the isolating position and the grounding position of the three-position switch respectively, and the gear teeth of the driven wheel are provided between any two sections of the check arcs; The driving wheel is provided with a section of the check arc and a section of the gear teeth; When the check arc of the driven wheel cooperates with the check arc of the driving wheel and is locked, the three-position switch is driven to maintain in the closing position, the isolating position or the grounding position.

4. The operating mechanism according to claim 3, characterized in that: The arc length of the gear teeth arranged on the driven wheel and the arc length of the gear teeth arranged on the driving wheel are determined according to the movement time and the rest time of the driven wheel.

5. The operating mechanism according to claim 2, characterized in that: The arc length of the teeth arranged on the driving wheel is 1 / 6 of the circumference of the driven wheel, so that every time the driving wheel rotates 360 degrees, it drives the driven wheel to rotate 60 degrees.

6. The operating mechanism according to claim 1, characterized in that: A limiting member is installed on the driven wheel, and a limiting groove is provided on the upper mounting plate. The head end of the limiting member is located in the limiting groove, and the limiting member slides in the limiting groove as the driven wheel rotates.

7. The operating mechanism according to claim 6, characterized in that: The shape of the limiting groove is adapted to the sliding track of the limiting member.

8. The operating mechanism according to claim 6, characterized in that: The front end of the worm is provided with a shaft extension, which is a hexagonal shaft. When the motor is not powered, the worm is driven to rotate by an operating handle to achieve manual control.

9. The operating mechanism according to claim 1, characterized in that: The operating mechanism also includes: A driving bevel gear is coaxially arranged with the driven wheel, the driving bevel gear and the driven wheel are both connected to a rotating shaft, and the driven wheel drives the driving bevel gear to rotate via the rotating shaft; A driven bevel gear meshes with the driving bevel gear and rotates driven by the driving bevel gear; An auxiliary switch transmission shaft is connected to the driven bevel gear and rotates under the drive of the driven bevel gear; A transmission crank arm is fixedly connected to the auxiliary switch transmission shaft and rotates with the rotation of the auxiliary switch transmission shaft; The auxiliary switch module is connected to the transmission crank arm through a four-bar linkage and rotates under the drive of the transmission crank arm.

10. The operating mechanism according to claim 9, characterized in that: The auxiliary switch module is connected to an indicator board, on which at least two indicator lights of different colors are provided. The auxiliary switch module and the indicator board are coaxially arranged. When the auxiliary switch module rotates to realize switching on and off, the indicator board is driven to rotate, so that the indicator light indicating the corresponding working position of the three-position switch on the indicator board rotates to the specified position.

11. The operating mechanism according to claim 1, characterized in that: The operating mechanism also includes: a limiting plate connected to the connecting shaft and rotatable around the connecting shaft; A micro switch, electrically connected to the motor, for controlling the start and stop of the motor; When the micro switch is not pressed, the pressing handle of the micro switch presses the limit plate; when the micro switch is pressed, the pressing handle pops open, and the limit plate detaches from the micro switch. The limit plate rotates around the connecting shaft for one circle and then contacts the micro switch, causing the micro switch to generate a current or voltage pulse for starting or shutting down the motor.

12. A three-position switch, characterized in that: It includes a shell, a switch body arranged in the shell and an operating mechanism as described in any one of claims 1 to 11, wherein the operating mechanism is connected to the input shaft of the switch body to drive the switch body to move, thereby realizing the position switching of closing, isolating or grounding of the three-position switch.

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