Three-position operating mechanism and direct-acting isolating switch

Abstract

This invention relates to the field of disconnector technology, specifically to a three-position operating mechanism and a direct-acting disconnector. The three-position operating mechanism includes a frame, on which an disconnector operating shaft and a grounding operating shaft are mounted. A transmission shaft is rotatably mounted above the disconnector operating shaft, and the transmission shaft has a tripping limit release cam, which has a pushing protrusion and a clearance recess. The frame also includes a first swing frame and a second swing frame, and a movable plate is located below the disconnector operating shaft. A first tension spring is located between the first swing frame and the movable plate, and a first return spring is located between the frame and the first swing frame. A second tension spring is located between the second swing frame and the movable plate, and a second return spring is located between the frame and the second swing frame. A limit block is located on the disconnector operating shaft, and each of the two swing frames has a limit part and a pushing engagement part. The frame also includes an operating hole interlocking plate, which has an operating hole and a connecting rod connected to the movable plate.

Description

Technical Field

[0001] This invention relates to the field of disconnector technology, specifically to a three-position operating mechanism and a direct-acting disconnector. Background Technology

[0002] A three-position disconnecting switch is an electrical device used to switch between on, off, and ground states. Based on the movement of its contacts, it can generally be divided into knife-switch type and direct-acting type. Direct-acting disconnecting switches, due to their inherent characteristics, are generally matched with a rotary-to-direct-acting operating mechanism. A direct-acting disconnecting switch has a closing position at both ends, a grounding position, and an off position in the middle. Existing direct-acting disconnecting switch operating mechanisms generally use a single operating shaft to control the moving contact of the switch to switch between the three positions. However, this has the following problems: when the switch is switched to the closing or grounding position, there is a clear tactile feedback to remind the operator that the closing or grounding is complete; however, when the switch is switched to the off position, there is no clear tactile feedback to remind the operator whether the operation is complete. The operator can only judge whether the operation is complete by relying on the indicator on the equipment surface and the number of rotations in the instruction manual, which makes it impossible to accurately switch the position to the off position, easily leading to situations where the operation is incomplete or excessive.

[0003] Chinese utility model patent CN217521897U discloses an operating mechanism for a direct-acting disconnect switch. This mechanism includes a frame structure on which an disconnection operating shaft, a grounding operating shaft, and a transmission shaft are rotatably mounted. An indicator block is mounted on the transmission shaft. The frame also has a first limiting structure and a second limiting structure that are oscillatingly mounted. When the operating handle is inserted into the disconnection operating shaft, it drives the first limiting structure to move into the movement path of the indicator block. When the operating handle is inserted into the grounding operating shaft, it drives the second limiting structure to move into the movement path of the indicator block, ensuring that the indicator block accurately stops at the disconnection position.

[0004] The operating mechanism in the above-mentioned technology has a large axial dimension on the operating shaft, resulting in a large overall size of the operating mechanism, which is not conducive to the miniaturization of direct-acting disconnect switches. Summary of the Invention

[0005] The purpose of this invention is to provide a three-position operating mechanism to solve the problem that the operating mechanism in the prior art has a large axial dimension of the operating shaft, resulting in a large overall volume of the operating mechanism; the purpose of this invention is also to provide a direct-acting disconnect switch to solve the above problems.

[0006] To achieve the above objectives, the technical solution of the three-station operating mechanism of the present invention is as follows:

[0007] The three-position operating mechanism includes a frame, on which an isolation operating shaft and a grounding operating shaft are rotatably mounted. A drive shaft is rotatably mounted on the frame above the isolation operating shaft. The drive shaft has a tripping limit release cam, which has opposing pushing protrusions and opposing abutment recesses. A first swing frame and a second swing frame are also oscillatingly mounted on both sides of the drive shaft on the frame. A movable plate is located below the isolation operating shaft. A first tension spring is provided between the first swing frame and the movable plate, and a first return spring is provided between the frame and the first swing frame. The second swing frame… A second tension spring is provided between the movable plate and the frame, and a second return spring is provided between the frame and the second swing frame; a limit block is provided on the isolation operating shaft, and each of the two swing frames is provided with a limiting part for limiting the limit block and a pushing part for pushing the pushing protrusion; an operating hole interlocking plate is also oscillatingly mounted on the frame, and the operating hole interlocking plate is provided with an operating hole and a connecting rod connected to the movable plate. The isolation operating shaft and the grounding operating shaft are arranged at intervals in the swing direction of the operating hole interlocking plate, and the operating hole is aligned with the isolation operating shaft or the grounding operating shaft when the operating hole interlocking plate swings.

[0008] The beneficial effects are as follows: By setting an operation hole interlocking plate, the isolation operating shaft and grounding operating shaft are blocked by the operation hole interlocking plate when the operating mechanism is not operated manually, preventing the insertion of the operating handle. When the operation hole interlocking plate is pushed to one side, the grounding operating shaft is exposed, allowing grounding operation, while the isolation operating shaft remains blocked. When the operation hole interlocking plate is pushed to the other side, the isolation operating shaft is exposed, allowing closing operation, while the grounding operating shaft remains blocked. Moreover, through the limiting cooperation of the limiting part and the limiting block, only the grounding operating shaft can be operated to rotate from grounding open to grounding closed or from grounding closed to grounding open, and only the isolation operating shaft can be operated to rotate from isolation open to isolation closed or from isolation closed to isolation open, so as to accurately switch the work position to the isolation work position. In addition, the axial dimension of the operating shaft of this operating mechanism is small, resulting in a smaller overall size of the operating mechanism, which is beneficial to the miniaturization of the direct-acting disconnect switch.

[0009] As a further improvement, both the first swing frame and the second swing frame include an arc-shaped arm and an L-shaped arm. The pushing and limiting parts are both provided on the arc-shaped arm. The L-shaped arm includes a horizontal arm section and a vertical arm section. The end of the horizontal arm section away from the vertical arm section is fixed on the arc-shaped arm, and the end of the vertical arm section away from the horizontal arm section is connected to a corresponding tension spring.

[0010] The beneficial effect is that this design makes the tension spring farther away from the swing axis of the swing frame, that is, the lever arm is longer, and a smaller force is needed to drive the swing frame to rotate.

[0011] As a further improvement, the end of the arc-shaped arm constitutes the limiting portion.

[0012] The beneficial effect is that this design eliminates the need for separate machining of the limiting part, simplifying the machining process.

[0013] As a further improvement, the end of the horizontal arm segment away from the vertical arm segment is detachably fixed to the arc-shaped arm.

[0014] The beneficial effects are: this design facilitates the separate processing of the arc-shaped arm and the L-shaped arm, and also facilitates the assembly of the operating mechanism.

[0015] As a further improvement, both the first and second reset springs are reset tension springs.

[0016] The beneficial effect is that the reset spring can be easily placed between the frame and the corresponding swing frame.

[0017] As a further improvement, the push-fit part is a rolling element.

[0018] The beneficial effect is that this design can reduce friction and facilitate the rotation of the trip limit release cam.

[0019] As a further improvement, both the first and second swing frames are fixed with pins, and the rolling elements are bushings sleeved on the pins.

[0020] The beneficial effect is that, with this design, the force on the bushing is evenly distributed on the pin, ensuring that the bushing is evenly stressed during rotation and will not become skewed.

[0021] As a further improvement, the connecting rod is a manual lever, and the operating hole interlocking plate is also provided with a limiting pin connected to the movable plate. The limiting pin and the manual lever are arranged in parallel.

[0022] The beneficial effect is that this design ensures the stability of the movable board.

[0023] As a further improvement, the operating hole interlocking plate is also provided with an arc-shaped positioning hole. The drive shaft passes through the positioning hole, and when the drive shaft contacts the two end holes of the positioning hole respectively, the operating hole is aligned with the isolation operating shaft and the grounding operating shaft respectively.

[0024] To achieve the above objectives, the technical solution of the direct-acting disconnector of the present invention is as follows:

[0025] A direct-acting disconnect switch includes a switch body and a three-position operating mechanism. The three-position operating mechanism includes a frame, on which an disconnecting operating shaft and a grounding operating shaft are rotatably mounted. A drive shaft is rotatably mounted on the frame above the disconnecting operating shaft. The drive shaft is provided with a tripping limit release cam, which has opposing pushing protrusions and opposing abutment recesses. A first swing frame and a second swing frame are also oscillatingly mounted on both sides of the drive shaft on the frame. A movable plate is provided below the disconnecting operating shaft. A first tension spring is provided between the first swing frame and the movable plate. A connection is provided between the frame and the first swing frame. A first return spring; a second tension spring is provided between the second swing frame and the movable plate, and a second return spring is provided between the frame body and the second swing frame; a limit block is provided on the isolation operating shaft, and each of the two swing frames is provided with a limiting part for limiting and engaging with the limit block and a pushing part for pushing and engaging with the pushing protrusion; an operating hole interlocking plate is also oscillatingly mounted on the frame body, and the operating hole interlocking plate is provided with an operating hole and a connecting rod connected to the movable plate. The isolation operating shaft and the grounding operating shaft are arranged at intervals in the swing direction of the operating hole interlocking plate, and the operating hole is aligned with the isolation operating shaft or the grounding operating shaft when the operating hole interlocking plate swings.

[0026] The beneficial effects are as follows: By setting an operation hole interlocking plate, the isolation operating shaft and grounding operating shaft are blocked by the operation hole interlocking plate when the operating mechanism is not operated manually, preventing the insertion of the operating handle. When the operation hole interlocking plate is pushed to one side, the grounding operating shaft is exposed, allowing grounding operation, while the isolation operating shaft remains blocked. When the operation hole interlocking plate is pushed to the other side, the isolation operating shaft is exposed, allowing closing operation, while the grounding operating shaft remains blocked. Moreover, through the limiting cooperation of the limiting part and the limiting block, only the grounding operating shaft can be operated to rotate from grounding open to grounding closed or from grounding closed to grounding open, and only the isolation operating shaft can be operated to rotate from isolation open to isolation closed or from isolation closed to isolation open, so as to accurately switch the work position to the isolation work position. In addition, the axial dimension of the operating shaft of this operating mechanism is small, resulting in a smaller overall size of the operating mechanism, which is beneficial to the miniaturization of the direct-acting disconnect switch.

[0027] As a further improvement, both the first swing frame and the second swing frame include an arc-shaped arm and an L-shaped arm. The pushing and limiting parts are both provided on the arc-shaped arm. The L-shaped arm includes a horizontal arm section and a vertical arm section. The end of the horizontal arm section away from the vertical arm section is fixed on the arc-shaped arm, and the end of the vertical arm section away from the horizontal arm section is connected to a corresponding tension spring.

[0028] The beneficial effect is that this design makes the tension spring farther away from the swing axis of the swing frame, that is, the lever arm is longer, and a smaller force is needed to drive the swing frame to rotate.

[0029] As a further improvement, the end of the arc-shaped arm constitutes the limiting portion.

[0030] The beneficial effect is that this design eliminates the need for separate machining of the limiting part, simplifying the machining process.

[0031] As a further improvement, the end of the horizontal arm segment away from the vertical arm segment is detachably fixed to the arc-shaped arm.

[0032] The beneficial effects are: this design facilitates the separate processing of the arc-shaped arm and the L-shaped arm, and also facilitates the assembly of the operating mechanism.

[0033] As a further improvement, both the first and second reset springs are reset tension springs.

[0034] The beneficial effect is that the reset spring can be easily placed between the frame and the corresponding swing frame.

[0035] As a further improvement, the push-fit part is a rolling element.

[0036] The beneficial effect is that this design can reduce friction and facilitate the rotation of the trip limit release cam.

[0037] As a further improvement, both the first and second swing frames are fixed with pins, and the rolling elements are bushings sleeved on the pins.

[0038] The beneficial effect is that, with this design, the force on the bushing is evenly distributed on the pin, ensuring that the bushing is evenly stressed during rotation and will not become skewed.

[0039] As a further improvement, the connecting rod is a manual lever, and the operating hole interlocking plate is also provided with a limiting pin connected to the movable plate. The limiting pin and the manual lever are arranged in parallel.

[0040] The beneficial effect is that this design ensures the stability of the movable board.

[0041] As a further improvement, the operating hole interlocking plate is also provided with an arc-shaped positioning hole. The drive shaft passes through the positioning hole, and when the drive shaft contacts the two end holes of the positioning hole respectively, the operating hole is aligned with the isolation operating shaft and the grounding operating shaft respectively. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the three-station operating mechanism of the present invention;

[0043] Figure 2 for Figure 1 The main view;

[0044] Figure 3 for Figure 1 A schematic diagram of the internal structure of the three-station operating mechanism frame;

[0045] Figure 4 for Figure 3 Schematic diagrams of the structure of the first and second swing frames;

[0046] Figure 5 for Figure 3 A schematic diagram of the structure where the manual lever is moved to the right;

[0047] Figure 6 for Figure 5 A schematic diagram of the structure of the push-pull protrusion and push-pull bushing.

[0048] In the diagram: 11. Frame; 12. Main shaft; 13. Bearing; 14. Positioning hole; 15. Drive shaft; 16. Operating hole; 17. Manual lever; 18. Limit pin; 19. Operating hole interlock plate; 20. First arc-shaped arm; 21. First pin; 22. Pushing protrusion; 23. Avoidance recess; 24. Opening limit release cam; 25. First return spring; 26. First limit part; 27. First limit mating part; 28. 1. First L-shaped arm; 29. ​​First tension spring; 30. Limiting block; 31. Movable plate; 32. Isolation operating shaft; 33. Second tension spring; 34. Grounding operating shaft; 35. Second L-shaped arm; 36. Second limiting mating part; 37. Second limiting part; 38. Second return spring; 39. Second arc-shaped arm; 40. Second pin; 41. First bushing; 42. Second bushing; 43. First swing frame; 44. Second swing frame. Detailed Implementation

[0049] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0050] Embodiment 1 of the three-station operating mechanism of the present invention:

[0051] like Figures 1 to 6 As shown, the three-station operating mechanism includes a frame 11, on which a main shaft 12, a transmission shaft 15, an isolation operating shaft 32, and a grounding operating shaft 34 are rotatably mounted; the main shaft 12 is located directly above the transmission shaft 15, the transmission shaft 15 is located directly above the isolation operating shaft 32, and the grounding operating shaft 34 is located to the right of the isolation operating shaft 32.

[0052] like Figure 1 and Figure 2 As shown, an operation hole interlocking plate 19 is oscillatingly mounted on the main shaft 12 via a bearing 13. The operation hole interlocking plate 19 is provided with an operation hole 16 and a manual lever 17. The isolation operation shaft 32 and the grounding operation shaft 34 are arranged at intervals in the swing direction of the operation hole interlocking plate. When the manual lever 17 drives the operation hole interlocking plate 19 to swing, the operation hole 16 is aligned with the isolation operation shaft 32 or the grounding operation shaft 34.

[0053] In this embodiment, the operation hole interlock plate 19 is provided with an arc-shaped positioning hole 14. The drive shaft 15 passes through the positioning hole 14. When the drive shaft 15 contacts the left and right end walls of the positioning hole 14 respectively, the operation hole 16 is aligned with the grounding operation shaft 34 and the isolation operation shaft 32 respectively.

[0054] like Figure 3 and Figure 4 As shown, the drive shaft 15 is provided with a brake limit release cam 24, which has a push protrusion 22 and a clearance recess 23 arranged opposite to each other. A first swing frame 43 and a second swing frame 44 are respectively oscillatingly mounted on the left and right sides of the drive shaft 15 on the frame 11, and a movable plate 31 is provided below the isolation operation shaft 32.

[0055] In this embodiment, the first swing frame 43 includes a first arc-shaped arm 20 and a first L-shaped arm 28. The first arc-shaped arm 20 is provided with a first pin 21 and a first limiting part 26. A first bushing 41 is sleeved on the first pin 21. The first bushing 41 is used to push and cooperate with the pushing protrusion 22, and the first bushing 41 constitutes the pushing and cooperating part. The first L-shaped arm 28 includes a horizontal arm section and a vertical arm section. The end of the horizontal arm section away from the vertical arm section is detachably fixed to the first arc-shaped arm 20 by screws. A first tension spring 29 is provided between the end of the vertical arm section away from the horizontal arm section and the movable plate 31, and a first return spring 25 is provided between the frame body 11 and the horizontal arm section.

[0056] In this embodiment, the second swing frame 44 includes a second arc-shaped arm 39 and a second L-shaped arm 35. The second arc-shaped arm 39 is provided with a second pin 40 and a second limiting part 37. A second bushing 42 is sleeved on the second pin 40. The second bushing 42 is used to push and cooperate with the pushing protrusion 22, and the second bushing 42 constitutes the pushing and cooperating part. The second L-shaped arm 35 includes a horizontal arm section and a vertical arm section. The end of the horizontal arm section away from the vertical arm section is detachably fixed to the second arc-shaped arm 39 by screws. A second tension spring 33 is provided between the end of the vertical arm section away from the horizontal arm section and the movable plate 31, and a second return spring 38 is provided between the frame 11 and the horizontal arm section.

[0057] In this embodiment, both the first reset spring 25 and the second reset spring 38 are reset tension springs.

[0058] In this embodiment, a limiting block 30 is fixed on the isolation operation shaft 32. The limiting block 30 is provided with a first limiting engagement part 27 and a second limiting engagement part 36. The first limiting engagement part 27 is used to engage with the first limiting part 26 on the first arc-shaped arm 20, and the second limiting engagement part 36 is used to engage with the second limiting part 37 on the second arc-shaped arm 39.

[0059] In this embodiment, the lower end of the first arc-shaped arm 20 constitutes the first limiting part 26, and the lower end of the second arc-shaped arm 39 constitutes the second limiting part 37.

[0060] like Figure 1 and Figure 3 As shown, the manual lever 17 is connected to the movable plate 31 to drive the movable plate 31 to move in the left and right directions; the operating hole interlock plate 19 is also provided with a limiting pin 18 connected to the movable plate 31. The limiting pin 18 and the manual lever 17 are arranged in parallel and move together in the arc-shaped elongated hole on the frame 11.

[0061] The operation process of the three-position operating mechanism of the present invention is as follows: The initial state of the three-position operating mechanism is open, and an operation cycle is formed through the operation process of opening-closing-opening-grounding-opening. The following is a detailed description of the present invention.

[0062] like Figure 1 and Figure 2 As shown, when the manual lever 17 is moved to the right, the grounding operating shaft 34 is exposed, allowing for grounding closing and opening operations; when the manual lever 17 is moved to the left, the isolating operating shaft 32 is exposed, allowing for isolating closing and opening operations. When performing grounding side operations, rotating the grounding operating shaft 34 clockwise closes the grounding switch, and rotating it counterclockwise opens the grounding switch. When performing isolating side operations, rotating the isolating operating shaft 32 clockwise closes the isolating switch, and rotating it counterclockwise opens the isolating switch. The operating mechanism requires 13 rotations of either the isolating operating shaft 32 or the grounding operating shaft 34 from the open position to the closed or grounded position.

[0063] like Figure 3 As shown, when the three-position operating mechanism is in the open state, the open limit release cam 24 is vertically arranged; when the operating mechanism performs isolation or grounding operations, the open limit release cam 24 moves intermittently under the action of the gearbox. When the grounding operating shaft 34 or the isolation operating shaft 32 rotates one revolution, the open limit release cam 24 rotates 45°. When the grounding operating shaft 34 or the isolation operating shaft 32 rotates from the second revolution to the twelfth revolution, the open limit release cam 24 remains at the 45° position, at which point it can push the corresponding bushing to move outward, thereby releasing the limit state of the corresponding limit part; when the grounding operating shaft 34 or the isolation operating shaft 32 rotates to the thirteenth revolution, the open limit release cam 24 rotates to the 90° position, that is, the open limit release cam 24 is in the horizontal position, as shown. Figure 6 As shown, the reverse is also true. The intermittent movement of the trip limit release cam 24 is achieved through the meshing of a full gear and a partial gear. Its working principle is existing technology and will not be described in detail here.

[0064] When the three-station operating mechanism is not manually operated, both the first swing frame 43 and the second swing frame 44 are in a free position, such as Figure 3As shown. When performing a manual grounding operation, the manual lever 17 is moved to the right, causing the first tension spring 29 to stretch to the right. Under the tension of the first tension spring 29, the first swing frame 43 moves to the right, and the first limiting part 26 at the lower end of the first arc-shaped arm 20 moves downward to the first limiting mating part 27 on the left side of the limiting block 30, restricting the clockwise rotation of the limiting block 30 without affecting its counterclockwise rotation. At the same time, the first bushing 41 is positioned within the clearance recess 23, as shown. Figure 5 As shown. Then, insert the operating handle into the operating hole 16, so that the operating hole interlock plate 19 remains in that position, thereby preventing the first swing frame 43 from resetting and maintaining its position as shown. Figure 5 The position is shown. When the grounding operation shaft 34 is rotated counterclockwise, the isolation operation shaft 32 and the limit block 30 rotate clockwise under the drive of the internal gears of the mechanism. Since the first limit part 26 restricts the clockwise rotation of the limit block 30 at this time, the effect of manual grounding tripping limit is achieved. When the grounding operation shaft 34 is rotated clockwise, the isolation operation shaft 32 rotates counterclockwise under the drive of the internal gears of the mechanism, which can realize the tripping-grounding operation process. During the grounding operation of the mechanism or when the grounding is in place, since the tripping limit release cam 24 rotates and changes position, the push protrusion 22 pushes the first bushing 41 to move outward, thereby releasing the limiting state of the first limit part 26, such as Figure 6 As shown, the grounding operation shaft 34 can be rotated counterclockwise to realize the grounding-opening operation process.

[0065] The opening-closing-opening operation process on the isolation side of the three-position operating mechanism is similar to that on the grounding side, and the principle is the same, so it will not be described in detail here.

[0066] Embodiment 2 of the three-station operating mechanism of the present invention:

[0067] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, both the first swing frame and the second swing frame include an arc-shaped arm and an L-shaped arm, and the arc-shaped arm and the L-shaped arm are separate structures. In this embodiment, the arc-shaped arm and the L-shaped arm are an integral structure.

[0068] Embodiment 3 of the three-station operating mechanism of the present invention:

[0069] The difference between this embodiment and Embodiment 1 is that, in Embodiment 1, the end of the arc-shaped arm constitutes a limiting part. In this embodiment, the lower end of the arc-shaped arm extends downward and is lower than the limiting fitting part, and the inner side of the arc-shaped arm protrudes from the limiting part.

[0070] Embodiment 4 of the three-station operating mechanism of the present invention:

[0071] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the end of the horizontal arm segment furthest from the vertical arm segment is fixed to the curved arm with screws. In this embodiment, the end of the horizontal arm segment furthest from the vertical arm segment is welded and fixed to the curved arm.

[0072] Embodiment 5 of the three-station operating mechanism of the present invention:

[0073] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, both the first and second reset springs are reset tension springs. In this embodiment, both the first and second reset springs are reset torsion springs. In other embodiments, one of the first and second reset springs is a reset tension spring and the other is a reset torsion spring.

[0074] Embodiment 6 of the three-station operating mechanism of the present invention:

[0075] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, both the first and second swing frames are fixed with pins, and the rolling element is a bushing sleeve fitted on the pin, with the bushing constituting the rolling element. In this embodiment, rollers are rotatably mounted on the first and second swing frames, and the rollers constitute the rolling element.

[0076] Embodiment 7 of the three-station operating mechanism of the present invention:

[0077] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the connecting rod is a manual lever. In this embodiment, the connecting rod is located between the movable plate and the operating hole interlocking plate, and the operating hole interlocking plate is provided with an independent manual lever or manual lever block.

[0078] An embodiment of the direct-acting disconnect switch of the present invention: In this embodiment, the direct-acting disconnect switch includes a switch body and a three-position operating mechanism. The three-position operating mechanism has the same structure as any one of the embodiments 1 to 7 of the above-mentioned three-position operating mechanism, and will not be described again here.

[0079] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A three-station operating mechanism comprising a frame (11) on which a floating operating shaft (32) and a grounded operating shaft (34) are rotatably mounted, characterized in that, A drive shaft (15) is rotatably mounted on the frame (11) above the isolation operation shaft (32). The drive shaft (15) is provided with a tripping limit release cam (24), which has a push protrusion (22) and a clearance recess (23) arranged opposite to each other. A first swing frame (43) and a second swing frame (44) are also oscillatingly mounted on both sides of the drive shaft (15) on the frame (11). A movable plate (31) is provided below the isolation operation shaft (32). A first tension spring (29) is provided between the first swing frame (43) and the movable plate (31). A first reset spring (25) is provided between the frame (11) and the first swing frame (43). A second tension spring is provided between the second swing frame (44) and the movable plate (31). (33) A second return spring (38) is provided between the frame (11) and the second swing frame (44); a limit block (30) is provided on the isolation operating shaft (32), and a limit part for limiting cooperation with the limit block (30) and a push cooperation part for pushing cooperation with the push protrusion (22) are provided on both swing frames; an operating hole interlocking plate (19) is also oscillatingly mounted on the frame (11), and an operating hole (16) and a connecting rod connected to the movable plate (31) are provided on the operating hole interlocking plate (19). The isolation operating shaft (32) and the grounding operating shaft (34) are arranged at intervals in the swing direction of the operating hole interlocking plate (19). When the operating hole interlocking plate (19) swings, the operating hole (16) is aligned with the isolation operating shaft (32) or the grounding operating shaft (34).

2. The three-station operating mechanism of claim 1, wherein, The first swing frame (43) and the second swing frame (44) both include an arc-shaped arm and an L-shaped arm. The pushing and limiting parts are both set on the arc-shaped arm. The L-shaped arm includes a horizontal arm section and a vertical arm section. The end of the horizontal arm section away from the vertical arm section is fixed on the arc-shaped arm, and the end of the vertical arm section away from the horizontal arm section is connected to a corresponding tension spring.

3. The three-station operating mechanism according to claim 2, characterized in that, The end of the arc-shaped arm constitutes the limiting part.

4. The three-station operating mechanism according to claim 2 or 3, characterized in that, The end of the horizontal arm segment away from the vertical arm segment is detachably fixed to the arc-shaped arm.

5. The three-station operating mechanism according to claim 2 or 3, characterized in that, Both the first reset spring (25) and the second reset spring (38) are reset tension springs.

6. The three-station operating mechanism according to claim 1, 2, or 3, characterized in that, The push-fit part is a rolling element.

7. The three-station operating mechanism according to claim 6, characterized in that, The first swing frame (43) and the second swing frame (44) are both fixed with pins, and the rolling element is a bushing sleeve fitted on the pin.

8. The three-station operating mechanism according to claim 1, 2, or 3, characterized in that, The connecting rod is a manual lever (17), and the operation hole interlock plate (19) is also provided with a limiting pin (18) connected to the movable plate (31). The limiting pin (18) and the manual lever (17) are arranged in parallel.

9. The three-station operating mechanism according to claim 1, 2, or 3, characterized in that, The operation hole interlock plate (19) is also provided with an arc-shaped positioning hole (14). The drive shaft (15) passes through the positioning hole (14). When the drive shaft (15) contacts the two end holes of the positioning hole (14) respectively, the operation hole (16) is aligned with the isolation operation shaft (32) and the grounding operation shaft (34) respectively.

10. A direct-acting disconnect switch, comprising a switch body and a three-position operating mechanism, characterized in that, The three-station operating mechanism is the three-station operating mechanism as described in any one of claims 1 to 9.

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