Grounding switch

Abstract

The invention belongs to the technical field of high-voltage electrical equipment, and discloses a grounding switch which comprises a base, a grounding knife-switch driving mechanism, a static contact assembly, a grounding knife-switch assembly and a protection assembly. Wherein the grounding knife-switch driving mechanism and the static contact assembly are arranged on the base. The grounding switch assembly comprises a switch arm and a moving contact, the switch arm is rotationally connected with the base and is connected with the grounding switch driving mechanism at the same time, the moving contact is arranged at the end, away from the base, of the switch arm, the protection assembly comprises a protection plate and a transmission rod, the protection plate is rotationally arranged on the switch arm, and the transmission rod is connected between the protection plate and the grounding switch driving mechanism. According to the grounding switch, the protection plate can perform anti-icing protection on the moving contact when the grounding switch is switched off, and can rotate and avoid when the grounding switch is switched on, so that the moving contact and the static contact assembly are switched on smoothly, and interference is prevented; in addition, the transmission rod is arranged to drive the protection plate to rotate, so that the use of a flexible part is avoided, the transmission is more reliable, and the situation that the protection plate is not rotated in place is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage electrical equipment, and in particular to a grounding switch. Background Art

[0002] In the high-voltage power grid system, the grounding switch is an essential high-voltage electrical equipment. Its function is to effectively ground the high-voltage power grid system when the high-voltage transmission and distribution equipment is shut down for inspection, maintenance and replacement, thereby protecting the operating personnel.

[0003] At present, in order to prevent the moving contact from icing when the grounding switch is opened, some grounding switches are provided with an anti-icing plate on the knife arm. The anti-icing plate is rotatably connected to the knife arm through a reset torsion spring. When the grounding switch is closed, the knife arm moves toward the static contact and simultaneously drives the anti-icing plate to rotate and open, and the reset torsion spring is in a compressed state. When the grounding switch is opened, the knife arm moves away from the static contact, and the anti-icing plate is reset under the action of the reset spring to cover the moving contact to isolate rain and snow and play an anti-icing role.

[0004] In this structure, the anti-icing plate is reset by a flexible member (i.e., a reset torsion spring). However, after long-term use, the elastic reset ability of the reset torsion spring will gradually weaken, thereby causing the anti-icing plate to be unable to reset. Summary of the invention

[0005] The object of the present invention is to provide a grounding switch which can provide anti-icing protection for a moving contact when the grounding switch is in an open state and has a stable structure.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] Earthing switch, comprising:

[0008] Base;

[0009] A ground knife driving mechanism is arranged on the base;

[0010] A stationary contact assembly is arranged on the base;

[0011] A grounding knife assembly, comprising a knife arm and a moving contact, wherein the knife arm is rotatably connected to the base and is simultaneously connected to the grounding knife driving mechanism, and the moving contact is arranged at one end of the knife arm away from the base;

[0012] A protection assembly, comprising a protection plate and a transmission rod, wherein the protection plate is rotatably arranged on the knife arm, and the transmission rod is connected between the protection plate and the ground knife driving mechanism;

[0013] The ground knife driving mechanism can drive the knife arm to drive the moving contact to separate from or contact the static contact assembly, and at the same time drive the transmission rod to drive the protective plate to rotate and cover the moving contact or move away from the moving contact.

[0014] As an optional solution, the protective plate is provided with a second crank arm, the second crank arm includes a second rotating shaft and a second rotating plate connected to each other, the second rotating plate is provided with a third hinge hole, the second rotating shaft is rotatably connected to the knife arm, and the protective plate is fixedly arranged on the second rotating shaft;

[0015] A second hinged rod hinged to the third hinged hole is arranged at one end of the transmission rod close to the protective plate.

[0016] As an optional solution, the ground cutter driving mechanism includes a driving component, a ground cutter shaft and a linkage component, wherein the ground cutter shaft is rotatably arranged on the base, the driving component is used to drive the ground cutter shaft to rotate, one end of the linkage component is connected to the ground cutter shaft, and the other end of the linkage component is provided with a first hinge hole and a second hinge hole;

[0017] The knife arm is provided with an articulation shaft articulated with the first articulation hole;

[0018] A first hinge rod hinged to the second hinge hole is disposed at one end of the transmission rod away from the protective plate.

[0019] As an optional solution, the linkage assembly includes a first linkage plate and a second linkage plate which are hinged to each other, the first linkage plate is connected to the ground cutter shaft, and the second linkage plate is provided with the first hinge hole and the second hinge hole.

[0020] As an optional scheme, in the same longitudinal section, the hinge point of the first linkage plate and the second linkage plate and the center of the first hinge hole form a first connecting line, and the hinge point and the center of the ground knife rotating shaft form a second connecting line, and when the moving contact contacts the static contact assembly, the first connecting line and the second connecting line form a straight line.

[0021] As an optional solution, the linkage assembly further includes a U-shaped buckle, and a connecting plate is provided at one end of the first linkage plate connected to the ground cutter shaft, and the ground cutter shaft is clamped between the connecting plate and the U-shaped buckle.

[0022] As an optional solution, the cross-section of the knife arm is U-shaped, the transmission rod is arranged in the U-shaped groove of the knife arm, the protective plate is rotatably arranged on the outer bottom wall of the knife arm, and the hinge shaft is arranged in the U-shaped groove and is simultaneously connected to the two side walls of the knife arm.

[0023] As an optional solution, the outer peripheral wall of the ground cutter shaft is provided with an extension arm;

[0024] The driving assembly includes a driving member, a first crank arm and a connecting rod. The first crank arm includes a first rotating shaft and a first rotating plate that are connected to each other. The first rotating shaft is rotatably connected to the base. The connecting rod is hinged between the first rotating plate and the extension arm. The driving member is used to drive the first rotating shaft to rotate, so that the first rotating plate drives the ground knife rotating shaft to rotate.

[0025] As an optional solution, the stationary contact assembly includes an insulator, a terminal block and a stationary contact, the insulator is arranged on the base, the terminal block is arranged at one end of the insulator away from the base, and the stationary contact is arranged on the terminal block.

[0026] As an optional solution, the stationary contact assembly further includes a protective cover, which is disposed on the terminal board and buckled onto the stationary contact.

[0027] Beneficial effects of the present invention:

[0028] The present invention provides an earthing switch. When the earthing knife driving mechanism drives the knife arm to drive the moving contact to approach or move away from the static contact assembly, the protection plate can also be driven by the driving transmission rod to rotate close to and cover the moving contact or rotate away from the moving contact, so that the protection plate can provide anti-icing protection for the moving contact when the earthing switch is opened, and can rotate to avoid so that the moving contact and the static contact assembly can be closed smoothly to prevent interference when the earthing switch is closed. In addition, by arranging a transmission rod to drive the protection plate to rotate, the use of flexible parts is avoided, the transmission is made more reliable, and the situation where the protection plate cannot be rotated into place is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic structural diagram of a grounding switch provided by an embodiment of the present invention when it is in an open state;

[0030] Figure 2 is a schematic structural diagram of a grounding switch provided by an embodiment of the present invention when it is in a closed state;

[0031] Figure 3 is a schematic diagram of the structure of the linkage component involved in the embodiment of the present invention;

[0032] Figure 4 It is a structural schematic diagram of a grounding knife assembly and a protection assembly involved in an embodiment of the present invention;

[0033] Figure 5 is a schematic structural diagram of a second crank arm involved in an embodiment of the present invention;

[0034] Figure 6is a schematic structural diagram of a first crank arm involved in an embodiment of the present invention;

[0035] Figure 7 It is a structural schematic diagram of a base involved in an embodiment of the present invention.

[0036] In the figure:

[0037] 1. Base; 11. Base frame; 111. Support rod; 112. Fixing plate; 12. First mounting plate; 13. Second mounting plate; 14. Support shaft;

[0038] 2. Ground knife driving mechanism; 21. Driving assembly; 211. First crank arm; 2111. First rotating shaft; 2112. First rotating plate; 212. Connecting rod; 22. Ground knife rotating shaft; 221. Extension arm; 23. Linkage assembly; 231. First linkage plate; 2311. Connecting plate; 232. Second linkage plate; 2321. First hinge hole; 2322. Second hinge hole; 233. U-shaped buckle; 24. Soft connection;

[0039] 3. Stationary contact assembly; 31. Insulator; 32. Terminal block; 33. Stationary contact; 34. Protective cover;

[0040] 4. grounding knife assembly; 41. knife arm; 411. bottom wall; 412. side wall; 42. moving contact;

[0041] 5. Protection assembly; 51. Protection plate; 511. Second crank arm; 5111. Second rotating shaft; 5112. Second rotating plate; 5112a. Third hinge hole; 52. Transmission rod. DETAILED DESCRIPTION

[0042] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar parts or parts having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0043] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, it can be a mechanical connection or an electrical connection, it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the description of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0046] like Figure 1-Figure 7 As shown, an embodiment of the present invention provides a grounding switch, which includes a base 1, a grounding knife driving mechanism 2, a static contact assembly 3, a grounding knife assembly 4 and a protective assembly 5. The grounding knife driving mechanism 2 and the static contact assembly 3 are both arranged on the base 1. The grounding knife assembly 4 includes a knife arm 41 and a moving contact 42, the knife arm 41 is rotatably connected to the base 1 and is also connected to the grounding knife driving mechanism 2, the moving contact 42 is arranged at one end of the knife arm 41 away from the base 1, and the protective assembly 5 includes a protective plate 51 and a transmission rod 52, the protective plate 51 is rotatably arranged on the knife arm 41, and the transmission rod 52 is connected between the protective plate 51 and the grounding knife driving mechanism 2.

[0047] The ground knife driving mechanism 2 can drive the knife arm 41 to drive the moving contact 42 to separate from or contact the stationary contact assembly 3, and at the same time drive the transmission rod 52 to drive the protective plate 51 to rotate and cover the moving contact 42 or stay away from the moving contact 42.

[0048] That is, when the grounding switch is switched to the open state, the grounding knife driving mechanism 2 drives the knife arm 41 to drive the moving contact 42 to swing away from the static contact assembly 3, and at the same time, the grounding knife driving mechanism 2 also drives the transmission rod 52 to drive the protective plate 51 to rotate close to and cover the moving contact 42 to prevent rain and snow, thereby preventing the moving contact 42 from freezing. When the grounding switch is switched to the closed state, the grounding knife driving mechanism 2 drives the knife arm 41 to drive the moving contact 42 to swing close to the static contact assembly 3, so that the moving contact 42 and the static contact assembly 3 are in contact, and at the same time, the grounding knife driving mechanism 2 also drives the transmission rod 52 to drive the protective plate 51 to rotate away from the moving contact 42 to avoid, so that the moving contact 42 and the static contact assembly 3 are in contact and closed.

[0049] When the grounding switch driving mechanism 2 drives the knife arm 41 to drive the moving contact 42 to approach or move away from the static contact assembly 3, it can also drive the transmission rod 52 to drive the protective plate 51 to rotate close to and cover the moving contact 42 or rotate away from the moving contact 42, so that the protective plate 51 can protect the moving contact 42 from ice when the grounding switch is opened, and can rotate to avoid when the grounding switch is closed so that the moving contact 42 and the static contact assembly 3 can be closed smoothly to prevent interference; in addition, by arranging the transmission rod 52 to drive the protective plate 51 to rotate, the use of flexible parts is avoided, the transmission is made more reliable, and the situation where the protective plate 51 cannot rotate into place is avoided.

[0050] In this embodiment, the grounding knife assembly 4 further includes a flexible connection 24, which is connected to the knife arm 41 and has the other end connected to the field grounding terminal.

[0051] Specifically, the ground cutter driving mechanism 2 includes a driving assembly 21, a ground cutter shaft 22 and a linkage assembly 23. The ground cutter shaft 22 is rotatably arranged on the base 1. The driving assembly 21 is used to drive the ground cutter shaft 22 to rotate. One end of the linkage assembly 23 is connected to the ground cutter shaft 22. The other end of the linkage assembly 23 is provided with a first hinge hole 2321 and a second hinge hole 2322. The knife arm 41 is provided with a hinge shaft, which is hinged to the first hinge hole 2321 to realize the connection between the linkage assembly 23 and the knife arm 41. The end of the transmission rod 52 away from the protective plate 51 is provided with a first hinge rod, which is hinged to the second hinge hole 2322 to realize the connection between the linkage assembly 23 and the transmission rod 52. This structure drives the ground cutter shaft 22 to rotate through the driving assembly 21, so that the ground cutter shaft 22 drives the linkage assembly 23 to realize the swing of the knife arm 41 and the movement of the transmission rod 52.

[0052] More specifically, Figure 3 As shown, the linkage assembly 23 includes a first linkage plate 231 and a second linkage plate 232 that are hinged to each other. The end of the first linkage plate 231 away from the second linkage plate 232 is connected to the ground knife shaft 22, and the end of the second linkage plate 232 away from the first linkage plate 231 is provided with a first hinge hole 2321 and a second hinge hole 2322. This structure enables the first linkage plate 231 and the second linkage plate 232 to fold with each other when the ground knife shaft 22 rotates to drive the moving contact 42 to open the switch, so as to drive the knife arm 41 to swing and the transmission rod 52 to move; when the ground knife shaft 22 drives the moving contact 42 to close the switch, the first linkage plate 231 and the second linkage plate 232 open with each other to drive the knife arm 41 to swing in the opposite direction and the transmission rod 52 to move in the opposite direction.

[0053] In the same longitudinal section, the hinge point of the first linkage plate 231 and the second linkage plate 232 and the center of the first hinge hole 2321 form a first connecting line, and the hinge point of the first linkage plate 231 and the second linkage plate 232 and the center of the ground knife rotating shaft 22 form a second connecting line. In order to ensure the structural stability of the grounding switch in the closed state, when the moving contact 42 contacts the static contact assembly 3, the first connecting line and the second connecting line form a straight line, so that the angle between the first linkage plate 231 and the second linkage plate 232 is 180°, that is, the first linkage plate 231 and the second linkage plate 232 are at the dead point position, so that the force on the knife arm 41 is more stable (refer to Figure 2 ).

[0054] Optionally, the linkage assembly 23 further includes a U-shaped buckle 233, and a connecting plate 2311 is provided at one end of the first linkage plate 231 connected to the ground cutter shaft 22, and the ground cutter shaft 22 is clamped between the connecting plate 2311 and the U-shaped buckle 233 to achieve the connection between the first linkage plate 231 and the ground cutter shaft 22. When the U-shaped buckle 233 is loosened, the angle at which the first linkage plate 231 is set on the ground cutter shaft 22 can be adjusted, and the structure is reasonable. In this embodiment, the two side rods of the U-shaped buckle 233 are provided with external threads, and the connecting plate 2311 is provided with connecting holes that match the side rods. The two side rods are respectively inserted into the connecting holes on the connecting plate 2311 and fixed by nuts.

[0055] Alternatively, if Figure 4-Figure 5 As shown, the knife arm 41 is made of U-shaped groove aluminum profile, and its cross section is U-shaped. The transmission rod 52 is arranged in the U-shaped groove of the knife arm 41, the protection plate 51 is arranged on the outer bottom wall 411 of the knife arm 41, and the hinge shaft is arranged in the U-shaped groove and connected to the two side walls 412 of the knife arm 41. This structure enables the notch of the U-shaped groove of the knife arm 41 to face the base 1 when the grounding switch is opened, so that the transmission rod 52 and part of the linkage assembly 23 can be located in the U-shaped groove to prevent rain and snow from affecting the transmission rod 52 and the linkage assembly 23.

[0056] Optionally, the protective plate 51 is provided with a second crank arm 511, the second crank arm 511 includes a second rotating shaft 5111 and a second rotating plate 5112 which are vertically connected to each other, the second rotating plate 5112 is provided with a third hinge hole 5112a, the second rotating shaft 5111 is rotatably connected to the bottom wall 411 of the knife arm 41, the protective plate 51 is arranged outside the knife arm 41 and is fixedly connected to the second rotating shaft 5111; a second hinge rod is arranged at one end of the transmission rod 52 close to the protective plate 51, and the second hinge rod is hinged to the third hinge hole 5112a. When the ground knife rotating shaft 22 rotates, this structure can drive the linkage assembly 23 to move, and then drive the transmission rod 52 to move along the extension direction of the knife arm 41, so as to realize driving the second rotating plate 5112 to rotate, and the second rotating plate 5112 then drives the protective plate 51 to rotate by driving the second rotating shaft 5111.

[0057] In this embodiment, the protection plate 51 can achieve a 90° rotation, that is, the protection plate 51 can be parallel to the knife arm 41 to cover the moving contact 42 , and can be perpendicular to the knife arm 41 to avoid interference.

[0058] Alternatively, if Figure 2 Combined with Figure 6 As shown, an extension arm 221 is provided on the outer peripheral wall of the ground cutter shaft 22; the driving assembly 21 includes a driving member, a first crank arm 211 and a connecting rod 212, the first crank arm 211 includes a first rotating shaft 2111 and a first rotating plate 2112 which are vertically connected to each other, the first rotating shaft 2111 is rotatably connected to the base 1, and the two ends of the connecting rod 212 are respectively hinged to the first rotating plate 2112 and the extension arm 221 through joint bearings, and the driving member can drive the first rotating shaft 2111 to rotate, so that the first rotating plate 2112 drives the ground cutter shaft 22 to rotate.

[0059] Specifically, refer to Figure 1 The static contact assembly 3 includes an insulator 31, a terminal block 32 and a static contact 33. The insulator 31 is arranged on the base 1. The terminal block 32 is arranged at the end of the insulator 31 away from the base 1 and is connected to the field bus. The static contact 33 is arranged on the terminal block 32. The moving contact 42 can contact the static contact 33 to realize the closing of the grounding switch.

[0060] Furthermore, in order to provide anti-icing protection for the moving contact 42 and the stationary contact 33 when the grounding switch is in the closed state, the stationary contact assembly 3 also includes a protective cover 34, which is arranged on the terminal block 32 and buckled on the stationary contact 33.

[0061] Alternatively, if Figure 7 The base 1 includes a base frame 11 and a first mounting plate 12, a second mounting plate 13 and a support shaft 14 arranged on the base frame 11, the insulator 31 is arranged on the first mounting plate 12, the first rotating shaft 2111 is rotatably connected to the second mounting plate 13, and the knife arm 41 is rotatably connected to the support shaft 14.

[0062] Specifically, the base frame 11 includes two support rods 111 arranged at intervals and a fixed plate 112 connected to the bottom ends of the two support rods 111, the first mounting plate 12 and the second mounting plate 13 are both arranged on the two support rods 111, and the third mounting plates are arranged on the opposite sides of the two support rods 111, the support shaft 14 is arranged between the two third mounting plates, the ground knife rotating shaft 22 is rotatably passed through the two support rods 111, and an insulating sleeve is arranged between the ground knife rotating shaft 22 and the support rods 111.

[0063] Optionally, the support rod 111 is made of U-shaped channel steel.

[0064] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A grounding switch, characterized in that: include: Base (1); A ground knife driving mechanism (2) is arranged on the base (1); A stationary contact assembly (3) is arranged on the base (1); A grounding knife assembly (4), comprising a knife arm (41) and a moving contact (42), wherein the knife arm (41) is rotatably connected to the base (1) and is simultaneously connected to the grounding knife drive mechanism (2), and the moving contact (42) is arranged at one end of the knife arm (41) away from the base (1); A protection assembly (5) comprising a protection plate (51) and a transmission rod (52), wherein the protection plate (51) is rotatably arranged on the knife arm (41), and the transmission rod (52) is connected between the protection plate (51) and the ground knife driving mechanism (2); The ground knife driving mechanism (2) is capable of driving the knife arm (41) to drive the moving contact (42) to separate from or contact the stationary contact assembly (3), and simultaneously driving the transmission rod (52) to drive the protective plate (51) to rotate and cover the moving contact (42) or to move away from the moving contact (42).

2. The grounding switch according to claim 1, characterized in that: The protective plate (51) is provided with a second crank arm (511), the second crank arm (511) comprises a second rotating shaft (5111) and a second rotating plate (5112) which are connected to each other, the second rotating plate (5112) is provided with a third hinge hole (5112a), the second rotating shaft (5111) is rotatably connected to the knife arm (41), and the protective plate (51) is fixedly arranged on the second rotating shaft (5111); A second hinged rod hinged to the third hinged hole (5112a) is provided at one end of the transmission rod (52) close to the protective plate (51).

3. The grounding switch according to claim 1 or 2, characterized in that: The ground cutter driving mechanism (2) comprises a driving component (21), a ground cutter rotating shaft (22) and a linkage component (23); the ground cutter rotating shaft (22) is rotatably arranged on the base (1); the driving component (21) is used to drive the ground cutter rotating shaft (22) to rotate; one end of the linkage component (23) is connected to the ground cutter rotating shaft (22); and the other end of the linkage component (23) is provided with a first hinge hole (2321) and a second hinge hole (2322); The knife arm (41) is provided with a hinge shaft hinged to the first hinge hole (2321); One end of the transmission rod (52) away from the protective plate (51) is provided with a first hinge rod hinged to the second hinge hole (2322).

4. The grounding switch according to claim 3, characterized in that: The linkage assembly (23) comprises a first linkage plate (231) and a second linkage plate (232) which are hinged to each other, the first linkage plate (231) being connected to the ground cutter rotating shaft (22), and the second linkage plate (232) being provided with the first hinge hole (2321) and the second hinge hole (2322).

5. The grounding switch according to claim 4, characterized in that: In the same longitudinal section, the hinge point of the first linkage plate (231) and the second linkage plate (232) and the center of the first hinge hole (2321) form a first connecting line, and the hinge point and the center of the ground knife rotating shaft (22) form a second connecting line. When the moving contact (42) is in contact with the stationary contact assembly (3), the first connecting line and the second connecting line form a straight line.

6. The grounding switch according to claim 4, characterized in that: The linkage assembly (23) further comprises a U-shaped buckle (233); one end of the first linkage plate (231) connected to the ground cutter shaft (22) is provided with a connecting plate (2311); the ground cutter shaft (22) is clamped between the connecting plate (2311) and the U-shaped buckle (233).

7. The grounding switch according to claim 3, characterized in that: The cross-section of the knife arm (41) is U-shaped, the transmission rod (52) is arranged in the U-shaped groove of the knife arm (41), the protective plate (51) is rotatably arranged on the outer bottom wall (411) of the knife arm (41), and the hinge shaft is arranged in the U-shaped groove and is simultaneously connected to the two side walls (412) of the knife arm (41).

8. The grounding switch according to claim 3, characterized in that: The outer peripheral wall of the ground cutter rotating shaft (22) is provided with an extension arm (221); The driving assembly (21) comprises a driving member, a first crank arm (211) and a connecting rod (212); the first crank arm (211) comprises a first rotating shaft (2111) and a first rotating plate (2112) which are connected to each other; the first rotating shaft (2111) is rotatably connected to the base (1); the connecting rod (212) is hinged between the first rotating plate (2112) and the extension arm (221); the driving member is used to drive the first rotating shaft (2111) to rotate, so that the first rotating plate (2112) drives the ground cutter rotating shaft (22) to rotate.

9. The grounding switch according to claim 1, characterized in that: The stationary contact assembly (3) comprises an insulator (31), a terminal block (32) and a stationary contact (33); the insulator (31) is arranged on the base (1); the terminal block (32) is arranged at an end of the insulator (31) away from the base (1); and the stationary contact (33) is arranged on the terminal block (32).

10. The grounding switch according to claim 9, characterized in that: The stationary contact assembly (3) further comprises a protective cover (34), wherein the protective cover (34) is arranged on the wiring board (32) and is buckled onto the stationary contact (33).

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