Driving mechanism of grounding switch

Abstract

The utility model discloses a driving mechanism of a grounding switch, which comprises a bottom plate and the grounding switch arranged on the bottom plate, the grounding switch comprises a rotatable main shaft, and the driving mechanism is characterized in that the bottom plate is provided with a supporting plate used for supporting the main shaft to rotate, and the supporting plate is provided with a clamping and locking mechanism used for stopping the main shaft from rotating; the spindle is connected with a rotating shaft through a coupler. The rotating shaft is rotationally installed on the bottom plate. A first gear is mounted on the rotating shaft, a mounting seat and a motor are arranged on the bottom plate, and a second gear meshed with the first gear is arranged on an output shaft of the motor; the clamping and locking mechanism comprises a clamping and locking wheel installed on the main shaft and a clamping and locking support installed on the supporting plate, and the clamping and locking support is arranged on the clamping and locking wheel in a covering mode to limit the clamping and locking wheel to rotate by 90 degrees in a reciprocating mode. The supporting plate is provided with an electromagnetic push rod used for stopping rotation of the clamping and locking wheel. At least one fixing plate located between the base and the supporting plate is installed on the main shaft, and a microswitch is integrated on the fixing plate. The main shaft is automatically controlled to rotate, and the rotating state is detected.

Description

Technical Field

[0001] The utility model relates to the technical field of high - voltage earthing switches, in particular to a driving mechanism of an earthing switch. Background Technique

[0002] As a key component in power equipment, the high - voltage earthing switch plays an indispensable role in ensuring the safe operation of the power grid, implementing maintenance operations, and dealing with sudden faults. The high - voltage earthing switch can quickly ground the fault point when a fault occurs, effectively release electrical energy, prevent the expansion of the fault, and protect the safety of personnel and equipment. During the daily maintenance and fault repair of power facilities, it is necessary to reliably ground high - voltage equipment to ensure the personal safety of operators.

[0003] The high - voltage earthing switch is generally integrated in power equipment. Under normal conditions, the earthing switch is in the open state, while during maintenance, the earthing switch is in the closed state. For the earthing switch, good limiting is required both when it is opened and closed to avoid misoperation and reduce the risk of safety accidents.

[0004] After the earthing cable is connected, when the operator is at a certain distance from the earthing switch, the opening and closing actions of the earthing switch can be automatically controlled through the PLC control box integrated in the power equipment. However, specifically after the opening and closing actions of the earthing switch, state stopping is required until the operator completes the operation before the earthing switch can be operated again. Therefore, it is necessary to further perform safer state limiting and stopping for the earthing switch and realize monitoring. Content of the Utility Model

[0005] (I) Technical Problem

[0006] The purpose of the utility model is to provide a driving mechanism of an earthing switch to solve the problems of automatic rotation stopping and rotation monitoring when the earthing switch is operated through an automatic control method in the prior art.

[0007] (II) Technical Solution

[0008] To achieve the above purpose, the utility model provides the following technical solution:

[0009] A driving mechanism of an earthing switch, including a bottom plate and an earthing switch installed on the bottom plate. The earthing switch includes a rotatable main shaft. It is characterized in that: a support plate for supporting the rotation of the main shaft is provided on the bottom plate, and a locking mechanism for stopping the rotation of the main shaft is provided on the support plate;

[0010] The main shaft is connected to a rotating shaft through a coupling, and the rotating shaft is rotatably installed on the bottom plate;

[0011] A first gear is installed on the rotating shaft. An installation base is provided on the bottom plate, and a motor is installed on the installation base. A second gear meshing with the first gear is provided on the output shaft of the motor;

[0012] The locking mechanism includes a locking wheel installed on the main shaft and a locking bracket installed on the support plate. The locking bracket covers the locking wheel and limits its reciprocating rotation by 90°;

[0013] An electromagnetic push rod for stopping the rotation of the locking wheel is provided on the support plate;

[0014] At least one fixing plate is installed on the main shaft between the base and the support plate, and a micro switch is integrated on the fixing plate.

[0015] Preferably, the earthing switch includes a base installed on the bottom plate. The main shaft is rotatably installed on the base. A first earthing knife bracket and a second earthing knife bracket are installed on the main shaft at intervals. Two earthing knives are installed on each of the first earthing knife bracket and the second earthing knife bracket at intervals. An adjusting screw for adjusting the width is provided between the two earthing knives, and a clamping groove is formed by enclosing between the two earthing knives; Three columns are installed on the base at intervals. A bracket and a conductive spring piece fixed on the bracket are provided on each column; A limiting block for limiting the corresponding earthing knife is provided on one of the columns; A limiting piece is installed on the main shaft, and a height adjusting screw and a locking nut for tightening the height adjusting screw are provided on the base; When the main shaft rotates 0°, the limiting piece supports on the height adjusting screw, and when the main shaft rotates 90°, the earthing knife supports on the limiting block.

[0016] Preferably, two first bearing seats are installed on the bottom plate at intervals. A driving shaft is rotatably installed on the two first bearing seats. A dial and a protruding column provided on the dial are installed on the driving shaft; A sprocket wheel is installed on the rotating shaft through a second overrunning clutch. Four notches are provided on the sprocket wheel in a circumferentially evenly distributed manner. The protruding column is in sliding fit with the notch. The first gear is installed on the rotating shaft through a first overrunning clutch; A hand crank is installed at one end of the driving shaft.

[0017] Preferably, the first overrunning clutch and the second overrunning clutch have the same structure, and both include an inner ring installed on the driving shaft and a wedge block provided on the inner ring. A roller and a buffer spring are provided between the wedge block and the inner ring. An outer ring is sleeved outside the wedge block, and the inner wall of the outer ring is in wedge-shaped fit with the wedge block.

[0018] Preferably, an eccentric wheel is provided on the dial, and a groove structure in rolling fit with the eccentric wheel is provided on the sprocket wheel.

[0019] Preferably, a traction mechanism is further provided on the base, and the traction mechanism is used to drive the electromagnetic push rod in a power-off state; the traction mechanism includes two second bearing seats spaced apart and installed on the bottom plate, a linkage shaft is rotatably installed on the two second bearing seats, a third gear is installed on the linkage shaft, and a fourth gear meshing with the third gear is installed on the drive shaft; a cam is installed at the end of the linkage shaft, a sliding frame is horizontally slidably arranged on the support plate, and the cam is arranged inside the sliding frame; a traction pull rod is slidably arranged on the sliding frame, and the traction pull rod is used to drive the electromagnetic push rod in a power-off state to act.

[0020] Preferably, the electromagnetic push rod includes a mounting bracket installed on the support plate, an electromagnetic driving part is installed on the mounting bracket, a push rod is connected to the electromagnetic driving part, the push rod is connected to the traction pull rod, and a return spring abutting against the mounting bracket is sleeved on the push rod.

[0021] Preferably, two parallel limit pins are provided on the lock bracket, a limit protrusion is provided on the lock wheel, a first end face located on the horizontal center plane of the lock wheel and a second end face located on the longitudinal center plane of the lock wheel are provided on the protrusion; when the lock wheel rotates 0°, the second end face abuts against one of the limit pins, and when the lock wheel rotates 90°, the first end face abuts against the other limit pin.

[0022] Preferably, a first locking groove opposite to the first end face and a second locking groove opposite to the second end face are provided on the lock wheel.

[0023] (III) Beneficial effects

[0024] The second gear is driven by the motor to drive the first gear to rotate, so that the rotating shaft, the coupling and the main shaft rotate synchronously, the lock wheel rotates with the main shaft, and under the limiting action of the lock bracket, the main shaft can only rotate reciprocally by 90°, that is, it acts between the closed position and the open position of the earthing switch, and the lock wheel is limited by the electromagnetic push rod at both positions, so as to ensure the safety after the operation of the earthing switch;

[0025] At the same time, a micro switch is integrated on the main shaft to detect the rotation action, and the actions of the motor and the electromagnetic push rod are further linked, so as to realize the complete electrification of the closing and opening processes of the earthing switch. After being integrated into the power equipment, the linkage control is realized through the PLC control box in the power equipment. Brief description of the drawings

[0026] Figure 1 It is a schematic structural diagram of an embodiment of the present invention;

[0027] Figure 2 This is a schematic structural diagram of the drive mechanism in the embodiment of the present utility model;

[0028] Figure 3 This is a schematic structural diagram of the first overrunning clutch and the second overrunning clutch in the embodiment of the present utility model;

[0029] Figure 4 This is a schematic structural diagram of the grounding switch in the embodiment of the present utility model;

[0030] Figure 5 This is a schematic structural diagram of the cooperation between the locking wheel and the locking bracket in the embodiment of the present utility model;

[0031] In Figures 1 to 5 the corresponding relationship between the component names or lines and the drawing reference numerals is as follows:

[0032] Base plate 1, grounding switch 2, main shaft 21, base 22, first grounding knife bracket 23, second grounding knife bracket 24, grounding knife 25, adjusting screw 26, engaging groove 27, column 28, conductive reed 29, limit stop 210, limit piece 211, height adjusting screw 212, locking nut 213, support plate 3, locking wheel 4, convex portion 41, first end face 42, second end face 43, first locking groove 44, second locking groove 45, locking bracket 5, limit pin 50, electromagnetic push rod 6, mounting bracket 61, electromagnetic driving part 62, push rod 63, return spring 64, rotating shaft 7, coupling 8, first overrunning clutch 9, second overrunning clutch 10, first gear 11, grooved wheel 12, notch 120, groove structure 121, mounting seat 131, motor 132, second gear 133, first bearing seat 141, driving shaft 142, dial 143, convex column 144, hand wheel 145, eccentric wheel 146, traction mechanism 15, second bearing seat 151, linkage shaft 152, third gear 153, fourth gear 154, cam 155, sliding frame 156, traction pull rod 157, fixing plate 16, micro switch 17, inner ring 18, wedge 19, roller 20, buffer spring 21, outer ring 22. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0034] See Figures 1 - 5As shown in the figure, in the embodiment of the present utility model, a driving mechanism of a grounding switch is proposed, which is integrated in a power device and mainly performs electrified operations of closing or opening the grounding switch when grounding is required. A PLC control box is integrated in the power device to achieve control, and the related circuits can adopt mature technologies. Specifically, it includes a bottom plate and a grounding switch installed on the bottom plate. The grounding switch includes a rotatable main shaft. The closing or opening of the grounding switch mainly lies in rotating the main shaft. Generally, to determine complete closing and complete opening, when the main shaft rotates to the 0° position, it is in the fully open state, and when the main shaft rotates to the 90° position, it is in the fully closed state. Specifically, a support plate for supporting the rotation of the main shaft is provided on the bottom plate, and a locking mechanism for stopping the rotation of the main shaft is provided on the support plate. The locking mechanism includes a locking wheel installed on the main shaft and a locking bracket installed on the support plate. The locking bracket covers the locking wheel and limits its reciprocating rotation by 90°. An electromagnetic push rod for stopping the rotation of the locking wheel is provided on the support plate. The locking wheel rotates synchronously with the main shaft. The reciprocating rotation of the locking wheel is limited by 90° through the locking bracket, and the locking wheel is limited and stopped by the battery push rod when the main shaft rotates to the closed or open state of the grounding switch.

[0035] Specifically, the main shaft is connected to a rotating shaft through a coupling. The rotating shaft is rotatably installed on the bottom plate. At the same time, a first gear is installed on the rotating shaft. An installation seat is provided on the bottom plate and a motor installed on the installation seat. A second gear meshing with the first gear is provided on the output shaft of the motor. By driving the second gear to rotate by the motor, the first gear drives the rotating shaft, the coupling and the main shaft to rotate synchronously. Specifically, the rotation of the motor is mainly forward and reverse rotation.

[0036] At the same time, at least one fixing plate located between the base and the support plate is installed on the main shaft. A microswitch is integrated on the fixing plate. The rotation of the main shaft is detected by the microswitch to link the actions of the electromagnetic push rod and the motor. Specifically, all are controlled by the PLC control box in the power device.

[0037] Specifically, the grounding switch includes a base installed on the bottom plate. The main shaft is rotatably installed on the base. A first grounding knife bracket and a second grounding knife bracket are installed at intervals on the main shaft. Two grounding knives are installed at intervals on both the first grounding knife bracket and the second grounding knife bracket. An adjusting screw for adjusting the width is provided between the two grounding knives. A clamping groove is formed by enclosing between the two grounding knives; three columns are installed at intervals on the base. A bracket and a conductive spring piece fixed on the bracket are provided on each column. The closing or opening is realized by the cooperation of the clamping groove and the conductive spring piece, and the width of the clamping groove is adjusted by the adjusting screw to ensure the stable clamping of the conductive spring piece and meet the requirements of the stability of the conductive connection.

[0038] Specifically, when the main shaft rotates 0°, the engaging groove and the conductive spring piece are in the open state, and when the main shaft rotates 90°, the engaging groove and the conductive spring piece are in the closed state.

[0039] The 0° mentioned in the above description is the position where it is completely separated and supports the main shaft, while 90° is the position where the conductive spring piece and the engaging groove are reliably engaged, thereby satisfying reliable limiting and anti-rotation of the main shaft at these two positions.

[0040] A limit stop for limiting the corresponding earthing knife is provided on one of the columns. When the engaging groove and the conductive spring piece are in a reliably closed state, the rotation of the main shaft is limited by blocking the earthing knife through the limit stop. At the same time, a limit piece is installed on the main shaft, and a height adjustment screw and a locking nut for tightening the height adjustment screw are provided on the base. When the main shaft rotates to the fully open state, the limit piece is supported and limited by the height adjustment screw, that is, the current rotation angle of the main shaft is supported and limited, and the height can be adjusted according to the rotation angle of the main shaft and then locked by the locking nut. Generally, when the main shaft rotates 0°, the limit piece is supported on the height adjustment screw, and when the main shaft rotates 90°, the earthing knife is supported on the limit stop.

[0041] Specifically, the electrified method is convenient and intelligent for driving the rotation of the main shaft. However, when there is a fault in the electrified method, a manually operable mechanism needs to be provided to ensure the application safety of the earthing switch. Specifically, two first bearing seats are installed at intervals on the base plate, a driving shaft is rotatably installed on the two first bearing seats, a dial and a protruding column provided on the dial are installed on the driving shaft. At the same time, a grooved wheel is installed on the rotating shaft through a second overrunning clutch. The grooved wheel is provided with 4 notches evenly distributed in the circumferential direction. The protruding column is slidably matched with the notch. The first gear is installed on the rotating shaft through a first overrunning clutch. Since both power sources can drive the rotation of the main shaft, the power separation is achieved through the first overrunning clutch and the second overrunning clutch without interference. The outer ring of the overrunning clutch can drive the inner ring to rotate, while the inner ring rotation will not drive the outer ring to rotate. The overrunning clutch can adopt existing mature products.

[0042] At the same time, a hand crank is installed at one end of the driving shaft. After driving the driving shaft to reciprocate by the hand crank, the protruding column slides into the notch to drive the grooved wheel to rotate, thereby driving the rotating shaft and the main shaft to reciprocate synchronously. At this time, it will not drive the first gear to rotate. On the contrary, when the first gear drives the main shaft to reciprocate, it will not drive the grooved wheel to rotate.

[0043] Specifically, in this embodiment, the structures of the first overrunning clutch and the second overrunning clutch are proposed. The structures of the first overrunning clutch and the second overrunning clutch are the same, and both include an inner ring installed on the drive shaft and wedges arranged on the inner ring. A roller and a buffer spring are arranged between the wedge and the inner ring. An outer ring is sleeved outside the wedge, and the inner wall of the outer ring is in wedge-shaped fit with the wedge. When the outer ring rotates, under the action of the wedge-shaped fit between the inner wall and the wedge, the inner ring is driven to rotate. When the inner ring rotates, no wedge-shaped action is generated, and the rotation of the inner ring while the outer ring does not rotate is realized through the action of the roller and the buffer spring.

[0044] The first overrunning clutch and the second overrunning clutch can also directly adopt mature products for direct application, not limited to the above-mentioned structural composition.

[0045] In order to further guide the process of the convex column sliding in and out of the notch and ensure a reliable driving process, an eccentric wheel is arranged on the dial, and a groove structure that is in rolling fit with the eccentric wheel is arranged on the grooved wheel. During the rotation process, the outer side wall of the eccentric wheel maintains rolling fit with the groove structure to achieve guidance.

[0046] When manual driving is adopted, it indicates that the electromagnetic push rod may also be in a power-off state. Specifically, a traction mechanism is further arranged on the base, and the traction mechanism is used to drive the electromagnetic push rod in a power-off state to act. Among them, the traction mechanism includes two second bearing seats installed on the base plate at intervals. A linkage shaft is rotatably installed on the two second bearing seats. A third gear is installed on the linkage shaft, and a fourth gear meshing with the third gear is installed on the drive shaft. When the drive shaft rotates, the linkage shaft rotates synchronously through the meshing of the third gear and the fourth gear. A cam is installed at the end of the linkage shaft. A sliding frame is slidably arranged horizontally on the support plate. The cam is arranged in the sliding frame, and a traction pull rod is slidably arranged on the sliding frame. The traction pull rod is used to drive the electromagnetic push rod in a power-off state to act. The drive shaft drives the cam to rotate, thereby realizing the horizontal reciprocating sliding of the sliding frame, so that the traction pull rod operates on the electromagnetic push rod to lock or unlock the locking wheel.

[0047] Among them, the electromagnetic push rod includes a mounting bracket installed on the support plate. An electromagnetic driving part is installed on the mounting bracket. A push rod is connected to the electromagnetic driving part. The push rod is connected to the traction pull rod. A return spring that abuts against the mounting bracket is sleeved on the push rod. Through the return spring, the push rod can always abut against the locking wheel to limit rotation. In the normal state, the magnetic force generated by the electromagnetic driving part causes the push rod to loosen from the locking wheel and unlock. In the power-off state, when the traction pull rod follows the sliding frame to slide, the push rod is driven to be pulled and unlocked synchronously. No matter which unlocking method is used, the push rod is reset under the action of the return spring.

[0048] Specifically, two parallel limit pins are provided on the latch bracket. A protruding portion is provided on the latch wheel. The protruding portion is provided with a first end face located on the horizontal center plane of the latch wheel and a second end face located on the longitudinal center plane of the latch wheel. When the latch wheel rotates 0°, the second end face abuts against one of the limit pins. When the latch wheel rotates 90°, the first end face abuts against the other limit pin. Thus, the latch wheel can only rotate reciprocally by 90°, limiting the rotation position of the main shaft, improving safety and ensuring the position is in place.

[0049] At the same time, a first latch groove opposite to the first end face and a second latch groove opposite to the second end face are provided on the latch wheel. That is, when the main shaft and the latch wheel rotate to the 0° position or the 90° position, the push rod extends into the first latch groove or the second latch groove to stop the latch wheel, ensuring the non-rotation state of the main shaft, reliably limiting the action state of the grounding switch, and enhancing safety.

[0050] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation" and the like shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0051] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of this utility model is usually placed. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0052] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A driving mechanism of a grounding switch, comprising a bottom plate and a grounding switch mounted on the bottom plate, wherein the grounding switch comprises a base mounted on the bottom plate, and the grounding switch comprises a rotatable main shaft, characterized in that: The bottom plate is provided with a support plate for supporting the rotation of the main shaft, and the support plate is provided with a locking mechanism for stopping the rotation of the main shaft; The main shaft is connected to a rotating shaft via a coupling, and the rotating shaft is rotatably mounted on the base plate; A first gear is mounted on the rotating shaft, a mounting seat and a motor mounted on the mounting seat are provided on the bottom plate, and a second gear meshing with the first gear is provided on the output shaft of the motor; The locking mechanism comprises a locking wheel mounted on the main shaft, and a locking bracket mounted on the support plate, wherein the locking bracket is covered on the locking wheel and limits its reciprocating rotation of 90°; The support plate is provided with an electromagnetic push rod for stopping the locking wheel from rotating; At least one fixing plate located between the base and the supporting plate is installed on the main shaft, and a micro switch is integrated on the fixing plate.

2. A driving mechanism for a grounding switch according to claim 1, characterized in that: The main shaft is rotatably mounted on the base, a first grounding knife bracket and a second grounding knife bracket are installed on the main shaft at intervals, two grounding knives are installed on the first grounding knife bracket and the second grounding knife bracket at intervals, an adjusting screw for adjusting the width is provided between the two grounding knives, and a clamping groove is formed between the two grounding knives; Three columns are installed on the base at intervals, and each column is provided with a bracket and a conductive spring fixed on the bracket; A limit stopper for limiting the position of the corresponding grounding knife is provided on one of the columns; A limit plate is installed on the main shaft, and a height adjustment screw and a locking nut for tightening the height adjustment screw are provided on the base; When the main shaft rotates 0°, the limit plate is supported on the height adjustment screw, and when the main shaft rotates 90°, the grounding knife is supported on the limit stop block.

3. The driving mechanism of the grounding switch according to claim 2, characterized in that: Two first bearing seats are installed at intervals on the bottom plate, and driving shafts are rotatably installed on the two first bearing seats, and a dial and a protruding column arranged on the dial are installed on the driving shaft; A sheave is mounted on the rotating shaft via a second overrunning clutch, the sheave is provided with four notches evenly distributed along the circumferential direction, the protruding column is slidably matched with the notches, and the first gear is mounted on the rotating shaft via a first overrunning clutch; A hand wheel is installed at one end of the driving shaft.

4. A driving mechanism for a grounding switch according to claim 3, characterized in that: The first overrunning clutch and the second overrunning clutch have the same structure, both comprising an inner ring mounted on a drive shaft and a wedge block arranged on the inner ring, rollers and buffer springs are arranged between the wedge block and the inner ring, an outer ring is arranged on the outer sleeve of the wedge block, and the inner wall of the outer ring is wedge-shapedly matched with the wedge block.

5. The driving mechanism of the grounding switch according to claim 4, characterized in that: An eccentric wheel is arranged on the dial, and a groove structure which is rollingly matched with the eccentric wheel is arranged on the groove wheel.

6. A driving mechanism for a grounding switch according to claim 5, characterized in that: The base is also provided with a traction mechanism, which is used to drive the electromagnetic push rod to move in a power-off state; The traction mechanism comprises two second bearing seats installed at intervals on the bottom plate, a linkage shaft is rotatably installed on the two second bearing seats, a third gear is installed on the linkage shaft, and a fourth gear meshing with the third gear is installed on the driving shaft; A cam is installed at the end of the linkage shaft, a sliding frame is provided on the support plate for horizontal sliding, and the cam is arranged in the sliding frame; A traction rod is slidably provided on the sliding frame, and the traction rod is used to drive the electromagnetic push rod in a power-off state to move.

7. The driving mechanism of the grounding switch according to claim 6, characterized in that: The electromagnetic push rod includes a mounting frame mounted on the support plate, an electromagnetic driving part is mounted on the mounting frame, a push rod is connected to the electromagnetic driving part, the push rod is connected to the traction rod, and a reset spring abutting against the mounting frame is sleeved on the push rod.

8. The driving mechanism of the grounding switch according to claim 7, characterized in that: The locking bracket is provided with two parallel limiting pins, the locking wheel is provided with a limiting protrusion, the protrusion is provided with a first end surface located on the horizontal center plane of the locking wheel, and a second end surface located on the longitudinal center plane of the locking wheel; When the locking wheel rotates 0°, the second end surface abuts against one of the limit pins, and when the locking wheel rotates 90°, the first end surface abuts against the other limit pin.

9. The driving mechanism of the grounding switch according to claim 8, characterized in that: The locking wheel is provided with a first locking groove arranged opposite to the first end surface, and a second locking groove arranged opposite to the second end surface.

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