CN210245374U - Bipolar electric grounding knife switch - Google Patents

Abstract

The utility model provides a bipolar electronic ground connection switch, include: a shutter plate; a first fixed contact; a second fixed contact; the first fixed contact, the second fixed contact and the third fixed contact are arranged on the flashboard; one end of the first moving contact is rotatably connected with the third fixed contact, and the other end of the first moving contact is connected with the first fixed contact in a break-make manner; one end of the second moving contact is rotatably connected with the third fixed contact, and the other end of the second moving contact is connected with the second fixed contact in a break-make manner; a drive assembly; the transmission assembly comprises a long shaft and a plurality of crank link mechanisms, the long shaft is in driving connection with the driving assembly and each crank link mechanism, and each crank link mechanism is in driving connection with the first moving contact and the second moving contact respectively so as to drive the first moving contact and the second moving contact to move synchronously. The utility model provides a problem that the earthing knife-switch among the prior art can't satisfy bipolar ground connection user demand.

Description

Bipolar electric grounding knife switch

Technical Field

The utility model relates to an electric power tech field particularly, relates to a bipolar electronic ground connection switch.

Background

When in the rail transit trade, when the maintenance that need have a power failure, need carry out ground connection to the circuit after the switch disconnection and experience electricity affirmation electroless, prevent that the switch misconnection from bringing bodily injury for the operation personnel. When a grounding knife switch is used for grounding a line, the grounding knife switch is switched on when maintenance is carried out, and the line is in short circuit with the ground; and after the maintenance is finished, the grounding knife switch is switched off, and the isolating switch is switched on. In the current urban rail transit, the majority of the urban rail transit are double rails, one rail is a return rail (equal to the ground), the other rail is a signal rail, and when a train is overhauled, only the positive electrode and the return rail need to be in short circuit, namely, the train is in single-pole grounding. However, the track traffic of some cities adopts straddle type monorail lines, such as Chongqing light rail, Liuzhou light rail and magnetic levitation. When such a track-type train is subjected to maintenance, the positive electrode of the train must be grounded, and the negative electrode of the train must be grounded at the same time, i.e., bipolar grounding. Such bipolar electric grounding knife switches are in a blank state on the market at present. The existing operation is realized by a manual grounding mode, the automation degree is low, and the manual overhaul workload is large.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a bipolar electric grounding switch, which solves the problem that the grounding switch in the prior art cannot satisfy the use requirement of bipolar grounding.

In order to achieve the above object, the present invention provides a bipolar electric grounding switch, comprising: a shutter plate; a first fixed contact; a second fixed contact; the first fixed contact, the second fixed contact and the third fixed contact are arranged on the flashboard; one end of the first moving contact is rotatably connected with the third fixed contact, and the other end of the first moving contact is connected with the first fixed contact in a break-make manner; one end of the second moving contact is rotatably connected with the third fixed contact, and the other end of the second moving contact is connected with the second fixed contact in a break-make manner; a drive assembly; the transmission assembly comprises a long shaft and a plurality of crank link mechanisms, the long shaft is in driving connection with the driving assembly and each crank link mechanism, and each crank link mechanism is in driving connection with the first moving contact and the second moving contact respectively so as to drive the first moving contact and the second moving contact to move synchronously.

Further, the drive assembly includes: the driving motor is connected with the flashboard; and the speed reducing mechanism is in driving connection with the driving motor and the long shaft.

Further, the speed reducing mechanism includes: the first bevel gear is in driving connection with the driving motor; and the transmission assembly is in driving connection with the second bevel gear.

Further, the crank link mechanism includes: one end of each crank is in driving connection with the long shaft; one end of the connecting rod is connected with one end, far away from the long shaft, of the crank, the other end of the connecting rod is connected with the first moving contact or the second moving contact, the long shaft drives the crank to rotate, the crank pushes the connecting rod, and the connecting rod drives the first moving contact and the second moving contact to be connected with or disconnected from the first static contact and the second static contact respectively.

Furthermore, the cranks are arranged in one-to-one correspondence with the connecting rods, and the first moving contact and the second moving contact are respectively connected with at least one connecting rod.

Furthermore, the long shaft is provided with a triggering protrusion which is convexly arranged, the transmission assembly further comprises an auxiliary switch, the auxiliary switch is electrically connected with the driving assembly, when the first moving contact and the second moving contact rotate to the right position, the triggering protrusion triggers the auxiliary switch, and the auxiliary switch controls the driving assembly to stop.

Furthermore, the long shaft is provided with a stopping part, the flashboard is provided with a limiting structure, when the first moving contact and the second moving contact rotate in place, the stopping part is abutted to the limiting structure, and the long shaft cannot continue to rotate.

Furthermore, the driving assembly further comprises a manual mechanism, and the manual mechanism is in driving connection with the speed reducing mechanism or the transmission assembly and can drive the first moving contact and the second moving contact to move in a manual mode.

Further, the rotation center lines of the first moving contact and the second moving contact are parallel to the gate plate.

Further, the first fixed contact and/or the second fixed contact comprise at least one fixed contact plate, the fixed contact plate is vertically arranged relative to the flashboard, the first moving contact and/or the second moving contact comprise at least two moving contact plates, the at least two moving contact plates are arranged at intervals, and the fixed contact plates can move to the intervals between the moving contact plates and are in contact with the moving contact plates.

By applying the technical proposal of the utility model, three static contacts of a first static contact, a second static contact and a third static contact and two moving contacts of a first moving contact and a second moving contact are arranged, wherein the third static contact is grounded, the first static contact and the second static contact are respectively connected with the anode and the cathode, a plurality of crank link mechanisms are arranged, and each crank link mechanism is respectively in driving connection with the first moving contact and the second moving contact, so that the driving force of the driving component is sequentially transmitted to each crank link mechanism through the long shaft and then transmitted to the first moving contact and the second moving contact through each crank link mechanism respectively, the first moving contact and the second moving contact synchronously move under the driving of the driving component, the grounding switch can be synchronously contacted with or separated from the first static contact and the second static contact, so that the positive pole and the negative pole are synchronously grounded and ungrounded, namely, the switch-on and the switch-off of the bipolar electric grounding switch are realized. The above-mentioned mode of setting up can drive the motion of two moving contacts simultaneously through one set of drive assembly, and the structure is succinct, and the synchronism is good. And the static contact is only provided with three, and the number of parts such as insulators matched with the static contact can be correspondingly reduced, so that the number of parts of the bipolar electric grounding switch is reduced, the whole structure is simple, and the manufacturing cost is reduced.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural diagram of a front side of a bipolar electric grounding switch of the present invention;

FIG. 2 shows a schematic view of the back side of the bipolar electrically powered earthing switch of FIG. 1;

FIG. 3 is a schematic diagram of the reduction mechanism of the bipolar electric earthing switch of FIG. 1;

FIG. 4 is a schematic diagram of the operation of the drive assembly of the bipolar electric grounding switch of FIG. 1;

FIG. 5 illustrates a bottom view of the bipolar powered grounding switch of FIG. 1 upon closing;

FIG. 6 is a schematic diagram of the bipolar electric grounding switch in FIG. 1 during switching-off;

FIG. 7 shows a bottom view of FIG. 6;

fig. 8 is a schematic structural diagram illustrating the cooperation between the trigger protrusion of the bipolar electric grounding switch in fig. 1 and the auxiliary switch; and

fig. 9 shows a schematic structure diagram of the stop portion and the limit structure of the bipolar electric grounding switch in fig. 1.

Wherein the figures include the following reference numerals:

10. a shutter plate; 11. a limiting structure; 20. a first fixed contact; 30. a second fixed contact; 40. a third static contact; 50. a first moving contact; 60. a second moving contact; 70. a drive assembly; 71. a drive motor; 72. a speed reduction mechanism; 721. a first bevel gear; 722. a second bevel gear; 73. a transmission assembly; 731. a long axis; 7311. a trigger protrusion; 7312. a stopper portion; 732. a crank; 733. a connecting rod; 734. an auxiliary switch; 74. and a manual mechanism.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present application, where the contrary is not intended, the use of directional words such as "upper, lower, top and bottom" is generally with respect to the orientation shown in the drawings, or with respect to the component itself in the vertical, perpendicular or gravitational direction; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

In order to solve the problem that the grounding knife-switch in the prior art can not satisfy the use requirement of bipolar grounding, the utility model provides a bipolar electric grounding knife-switch.

As shown in fig. 1 and 2, the bipolar electric grounding switch includes a gate plate 10, a first fixed contact 20, a second fixed contact 30, a third fixed contact 40, a first movable contact 50, a second movable contact 60, a driving component 70 and a transmission component 73, wherein the first fixed contact 20, the second fixed contact 30 and the third fixed contact 40 are disposed on the gate plate 10; one end of the first moving contact 50 is rotatably connected with the third fixed contact 40, and the other end of the first moving contact 50 is connected with the first fixed contact 20 in a manner of being capable of being switched on and off; one end of the second moving contact 60 is rotatably connected with the third fixed contact 40, and the other end of the second moving contact 60 is connected with the second fixed contact 30 in a switchable manner; the transmission assembly 73 includes a long shaft 731 and a plurality of crank-link mechanisms, the long shaft 731 is in driving connection with the driving assembly 70 and each crank-link mechanism, and each crank-link mechanism is in driving connection with the first movable contact 50 and the second movable contact 60 respectively to drive the first movable contact 50 and the second movable contact 60 to move synchronously.

In the embodiment, three fixed contacts, namely a first fixed contact 20, a second fixed contact 30 and a third fixed contact 40, and two movable contacts, namely a first movable contact 50 and a second movable contact 60, are arranged, wherein the third fixed contact 40 is grounded, the first fixed contact 20 and the second fixed contact 30 are respectively connected with an anode and a cathode, a plurality of crank link mechanisms are arranged, and each crank link mechanism is respectively in driving connection with the first movable contact 50 and the second movable contact 60, so that the driving force of the driving component 70 is sequentially transmitted to each crank link mechanism through the long shaft 731 and then is respectively transmitted to the first movable contact 50 and the second movable contact 60 through each crank link mechanism, so that the first movable contact 50 and the second movable contact 60 synchronously move under the driving of the driving component 70, that is synchronously contacted with or separated from the first fixed contact 20 and the second fixed contact 30, thereby realizing the synchronous grounding and non-grounding of the anode and the cathode, namely, closing and opening of the bipolar electric earthing knife-switch, as shown in fig. 1, 5 to 7. The arrangement mode can simultaneously drive the movement of the two moving contacts through one set of driving component 70, and has simple structure and good synchronism. And the static contact is only provided with three, and the number of parts such as insulators matched with the static contact can be correspondingly reduced, so that the number of parts of the bipolar electric grounding switch is reduced, the whole structure is simple, and the manufacturing cost is reduced.

The driving assembly 70 of this embodiment includes a driving motor 71 and a speed reducing mechanism 72, the driving motor 71 is connected to the shutter 10, the driving motor 71 provides a source power, the speed reducing mechanism 72 is connected to the driving motor 71 and the long shaft 731 in a driving manner, because the driving motor 71 usually has a high rotation speed, the speed reducing mechanism 72 is provided to reduce the rotation speed and other parameters of the driving motor 71 to a required range, and the transmission assembly 73 transmits the power transmitted from the speed reducing mechanism 72 to the first movable contact 50 and the second movable contact 60, so that the first movable contact 50 and the second movable contact 60 rotate synchronously under the driving of the driving motor 71.

As shown in fig. 3, the speed reducing mechanism 72 includes a first bevel gear 721 and a second bevel gear 722, the first bevel gear 721 is a small gear, the first bevel gear 721 is in driving connection with the driving motor 71, the second bevel gear 722 is a large gear, the second bevel gear 722 is engaged with the first bevel gear 721, the long shaft 731 is in driving connection with the second bevel gear 722, and speed reduction is achieved through the gears. Of course, other types of reduction mechanisms may be substituted as necessary.

As shown in fig. 1 and 4, since the present embodiment is provided with two movable contacts, namely, the first movable contact 50 and the second movable contact 60, the crank-link mechanism is provided with two crank mechanisms 732 and two connecting rods 733, and the crank mechanisms 732 and the connecting rods 733 are arranged in one-to-one correspondence, wherein the long shaft 731 is in driving connection with the second bevel gear 722 of the speed reducing mechanism 72, the two crank mechanisms 732 are respectively sleeved at different positions of the long shaft 731 and are both in driving connection with the long shaft 731, one end of the two connecting rods 733 is respectively connected with one end of the two crank mechanisms 732 away from the long shaft 731, the other end of the two connecting rods 733 is respectively connected with the first movable contact 50 and the second movable contact 60, and the axis of the connecting rod 733 with the crank mechanisms 732 and the axis of the connecting positions of the crank mechanisms 732 and the long shaft 731 are not coincident, so that the driving force of the driving motor 71 is transmitted, the long shaft 731 drives the two cranks 732 to rotate synchronously, the rotation of the two cranks 732 respectively pushes the two connecting rods 733, and the two connecting rods 733 respectively drive the first movable contact 50 and the second movable contact 60 to rotate, so that the first movable contact 50 is connected with or disconnected from the first fixed contact 20, and the second movable contact 60 is also connected with or disconnected from the second fixed contact 30, thereby realizing the synchronous grounding of the anode and the cathode, as shown in fig. 1, 5 to 7. Of course, more cranks 732 and connecting rods 733 may be provided, and each moving contact is simultaneously matched with the plurality of cranks 732 and the plurality of connecting rods 733, but it is required to ensure that each moving contact is respectively connected with at least one connecting rod 733, so that the synchronous motion of the moving contacts can be realized.

As shown in fig. 8, one end of the long shaft 731 has a trigger protrusion 7311 protruding radially, the transmission assembly 73 further includes an auxiliary switch 734, the trigger end of the auxiliary switch 734 is located on a rotation path of the trigger protrusion 7311, the auxiliary switch 734 is electrically connected to the driving motor 71, when the rotation of the long shaft 731 makes the first movable contact 50 and the second movable contact 60 rotate to the proper position, that is, the opening or closing of the bipolar electric grounding switch is completed, the trigger protrusion 7311 triggers the trigger end of the auxiliary switch 734, and the auxiliary switch 734 controls the driving motor 71 to stop, so as to achieve automatic stop of the bipolar electric grounding switch, and avoid the over-rotation condition. One end of the long shaft 731 far away from the triggering protrusion 7311 is rotatably connected to the shutter plate 10 through a bearing and a bearing seat, so as to ensure smooth rotation of the long shaft 731.

Alternatively, a plurality of auxiliary switches 734 may be provided, each of the auxiliary switches 734 is provided in both rotation directions of the long shaft 731, when the long shaft 731 rotates in one direction until the closing of the bipolar electric grounding switch is completed, the trigger protrusion 7311 triggers one auxiliary switch 734, and when the long shaft 731 rotates in the opposite direction until the opening of the bipolar electric grounding switch is completed, the trigger protrusion 7311 triggers the other auxiliary switch 734, so that the driving motor 71 can be stopped in time when the closing and opening of the bipolar electric grounding switch are completed, and of course, one auxiliary switch 734 may also be used to achieve the above-mentioned effects. A plurality of trigger projections 7311 may be provided, and each trigger projection 7311 is engaged with one auxiliary switch 734 or engaged with a plurality of auxiliary switches 734 in a one-to-one correspondence manner, and in any arrangement, it is sufficient if the driving motor 71 can be controlled to stop in time when the bipolar electric earthing switch operation is completed.

As shown in fig. 9, the long shaft 731 has a stopping portion 7312, the shutter 10 has a limiting structure 11, and when the first movable contact 50 and the second movable contact 60 rotate to positions, the stopping portion 7312 abuts against the limiting structure 11, and the long shaft 731 cannot rotate any more. The long shaft 731 is sleeved with a sector which is used as a stopping part 7312 protruding along the radial direction, of course, the sector can be processed integrally besides being arranged separately, the gate plate 10 is provided with a convex column which is used as a limiting structure 11, when the long shaft 731 rotates in place, the straight edge of the sector abuts against the convex column, so that the rotation of the long shaft 731 is limited, and the rotation range of the long shaft 731 is controlled.

Preferably, the projection includes scalable motion's first section and second section, wherein, first section is fixed on flashboard 10, second section and first section telescopic connection, when the projection was pushed up to the fan-shaped spare ground, the fan-shaped spare can promote the second section motion a short segment distance, thereby make the projection when playing limiting displacement, can also play the cushioning effect, avoided driving motor 71 because the unable problem that stops immediately of inertia factor leads to fan-shaped spare and the hard impact of projection, the life and the reliability of bipolar electronic ground switch have been improved. Of course, except the telescopic arrangement of the convex column, the convex column can also be processed by adopting an elastic piece which can deform, so that the convex column can play a role of buffering by depending on the material structure of the convex column.

As shown in fig. 1 and 3, the driving assembly 70 further includes a manual operating mechanism 74, and the manual operating mechanism 74 is in driving connection with the speed reducing mechanism 72 or the transmission assembly 73 and can manually drive the first movable contact 50 and the second movable contact 60 to move.

Specifically, the manual mechanism 74 includes an operating rod disposed on the switch body and a handle for operation, one end of the operating rod has a third bevel gear engaged with the second bevel gear 722, and the other end of the operating rod adopts a hexagonal protrusion or a hexagonal groove, and accordingly, the handle adopts a hexagonal groove or a hexagonal protrusion to cooperate with the operating rod, the operating rod is driven by the handle to rotate, and the operating rod directly drives the long shaft 731 to rotate, so as to realize manual operation of the bipolar electric grounding switch. Of course, other structures may be substituted for the above-mentioned partial structures, such as hexagonal protrusions, hexagonal recesses, and the like.

As shown in fig. 1 and 2, the rotation center lines of the first movable contact 50 and the second movable contact 60 are parallel to the shutter 10. When the gate 10 is vertically placed, the output shaft of the driving motor 71 is horizontally disposed, the axis of the first bevel gear 721 is horizontally disposed, the axis of the second bevel gear 722 and the long shaft 731 is vertically disposed, and the crank 732 and the connecting rod 733 horizontally move to drive the first movable contact 50 and the second movable contact 60 to horizontally rotate, and accordingly, at least a portion of the first fixed contact 20 and the second fixed contact 30 is horizontally disposed to match the rotating direction of the first movable contact 50 and the second movable contact 60.

Specifically, the first moving contact 50 and/or the second moving contact 60 include two moving contact plates, a connecting shaft and a limiting sleeve, the two moving contact plates are arranged at intervals, and the first static contact 20 or the second static contact 30 extends into the space between the two moving contact plates to be in contact with the moving contact plates; the connecting shaft penetrates through the movable contact plates and is in driving connection with the connecting rod 733 so as to drive the movable contact plates to rotate; the limiting sleeve penetrates through the connecting shaft, is located between the two movable contact plates arranged at intervals and is abutted against the movable contact plates to control the distance between the movable contact plates, when the movable contact plates are locked by the nuts from the outer sides of the two movable contact plates, the contact gaps are kept unchanged, the assembly manufacturability is improved, the nuts are always in a pre-tightening state, and the risk of loosening the nuts is reduced. Of course, more movable contact plates can be arranged, but the arrangement of the interval between at least two movable contact plates is required to be ensured. The first static contact 20 and/or the second static contact 30 includes a static contact plate, the static contact plate can extend into a gap between two moving contact plates, a part of the static contact plate is vertically arranged relative to the shutter 10, that is, a part of the static contact plate is horizontally arranged, and an inclined surface is arranged on one side of the static contact plate extending into the first moving contact 50 or the second moving contact 60, and the inclined surface is inclined towards a direction far away from a central plane of the static contact plate along a direction that the first moving contact 50 or the second moving contact 60 gradually approaches the static contact plate, so that when the moving contact plate rotates towards a direction close to the static contact plate, the moving contact plate contacts with the inclined surface, and the static contact plate extends into a gap between the two moving contact plates under the guide of the bipolar inclined surface, thereby avoiding the problem that the static contact plate and the moving contact plate are clamped due to the misalignment between the static contact plate and the moving contact plate, and enabling the electric grounding switch gate to move smoothly as a whole, meanwhile, the contact angle between the movable contact plate and the static contact plate is reduced, and the impact load is reduced. Of course, the arrangement direction can be changed correspondingly according to needs.

Optionally, the number of the inclined planes is multiple, the two opposite sides of the fixed contact plate are both provided with the inclined planes, and along the direction that the first moving contact 50 or the second moving contact 60 approaches the fixed contact plate, the inclined planes on the two opposite sides of the fixed contact plate incline towards the direction away from each other, and the inclined planes on the two sides can both play a guiding role in guiding the movable contact plate, so that the fault tolerance of the movement of the movable contact plate is further increased, and the interval between the movable contact plates only needs to be approximately aligned with the fixed contact plate.

It should be noted that, a plurality in the above embodiments means at least two.

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:

1. the problem that the grounding disconnecting link in the prior art cannot meet the use requirement of bipolar grounding is solved;

2. the grounding operation of the anode and the cathode can be realized respectively, and the market blanks of the current light rail, magnetic suspension and the like are filled;

3. the number of parts of the bipolar electric grounding disconnecting link is reduced, the whole structure is simple, and the manufacturing cost is reduced;

4. the automatic switching-on and switching-off of the bipolar electric grounding disconnecting link is realized by utilizing the driving motor, the manual grounding is replaced, the time and the labor are saved, and the safety is higher;

5. one set of drive assembly drives two moving contacts to move simultaneously, and the structure is succinct, and the synchronism is good.

It is obvious that the above described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A bipolar powered earthing switch, comprising:

a shutter plate (10);

a first stationary contact (20);

a second stationary contact (30);

the first fixed contact (20), the second fixed contact (30) and the third fixed contact (40) are arranged on the gate plate (10);

one end of the first moving contact (50) is rotatably connected with the third fixed contact (40), and the other end of the first moving contact (50) is connected with the first fixed contact (20) in an on-off manner;

one end of the second moving contact (60) is rotatably connected with the third fixed contact (40), and the other end of the second moving contact (60) is connected with the second fixed contact (30) in an on-off manner;

a drive assembly (70);

the transmission assembly (73) comprises a long shaft (731) and a plurality of crank-link mechanisms, the long shaft (731) is in driving connection with the driving assembly (70) and the crank-link mechanisms, and the crank-link mechanisms are in driving connection with the first movable contact (50) and the second movable contact (60) respectively so as to drive the first movable contact (50) and the second movable contact (60) to move synchronously.

2. The bipolar powered earthing switch according to claim 1, characterized in that said driving assembly (70) comprises:

a drive motor (71), wherein the drive motor (71) is connected with the shutter (10);

and the speed reducing mechanism (72) is in driving connection with both the driving motor (71) and the long shaft (731).

3. The bipolar electric grounding switch of claim 2, wherein the speed reduction mechanism (72) comprises:

a first bevel gear (721), wherein the first bevel gear (721) is in driving connection with the driving motor (71);

a second bevel gear (722), said second bevel gear (722) meshing with said first bevel gear (721), said transmission assembly (73) being in driving connection with said second bevel gear (722).

4. The bipolar electric grounding switch of claim 1, wherein the crank-link mechanism comprises:

a crank (732), one end of each crank (732) is in driving connection with the long shaft (731);

the connecting rod (733), one end of the connecting rod (733) is connected with one end of the crank (732) far away from the long shaft (731), the other end of the connecting rod (733) is connected with the first movable contact (50) or the second movable contact (60), the long shaft (731) drives the crank (732) to rotate, the crank (732) pushes the connecting rod (733), and the connecting rod (733) drives the first movable contact (50) and the second movable contact (60) to be connected with or disconnected from the first static contact (20) and the second static contact (30) respectively.

5. The bipolar electric grounding switch according to claim 4, wherein the cranks (732) are arranged in one-to-one correspondence with the connecting rods (733), and the first movable contact (50) and the second movable contact (60) are respectively connected with at least one of the connecting rods (733).

6. The bipolar electric grounding switch according to claim 1, wherein the long shaft (731) has a protrusion-disposed trigger protrusion (7311), the transmission assembly (73) further comprises an auxiliary switch (734), the auxiliary switch (734) is electrically connected to the driving assembly (70), when the first movable contact (50) and the second movable contact (60) rotate to a certain position, the trigger protrusion (7311) triggers the auxiliary switch (734), and the auxiliary switch (734) controls the driving assembly (70) to stop.

7. The bipolar electric grounding switch according to claim 1, wherein the long shaft (731) has a stopping portion (7312), the gate (10) has a limiting structure (11), when the first movable contact (50) and the second movable contact (60) rotate to a certain position, the stopping portion (7312) abuts against the limiting structure (11), and the long shaft (731) cannot rotate any more.

8. The bipolar electric grounding switch according to claim 2, wherein the driving assembly (70) further comprises a manual mechanism (74), and the manual mechanism (74) is in driving connection with the speed reducing mechanism (72) or the transmission assembly (73) and can manually drive the first movable contact (50) and the second movable contact (60) to move.

9. The bipolar electric grounding switch according to claim 1, characterized in that the rotation center line of the first movable contact (50) and the second movable contact (60) is parallel to the shutter (10).

10. The bipolar electric grounding knife switch according to claim 1, characterized in that the first static contact (20) and/or the second static contact (30) comprises at least one static contact plate which is vertically arranged relative to the shutter (10), the first movable contact (50) and/or the second movable contact (60) comprises at least two movable contact plates which are arranged at intervals, and the static contact plates can move to the intervals between the movable contact plates and contact with the movable contact plates.

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