A crank box structure and a co-box quick grounding switch, GIS

Abstract

The application provides a crank box structure, a common-box quick grounding switch and GIS, and belongs to the technical field of switch devices. The crank box structure comprises a crank box and a main shaft installed on the crank box, a crank is installed on the main shaft in the crank box, a transmission support is further arranged in the crank box, three-phase movable contacts are installed on the transmission support, the transmission support is in transmission connection with the crank so as to be driven by the crank to move, a guide structure for guiding the movement of the transmission support is arranged in the shell, and a grounding insulator in electric connection with the three-phase movable contacts is installed on the shell. Since the three-phase movable contacts are simultaneously installed on the transmission support in the application, only one rotating shaft and one crank are needed, the three-phase movable contacts are driven to move by driving the transmission support, compared with the prior art, the number of cranks and transition connecting rods is saved, the transmission connecting rod is omitted, and therefore the cost can be reduced and the assembly operation can be simplified.

Description

Technical Field

[0001] This invention relates to a crank arm box structure and a common-enclosure fast grounding switch and GIS, belonging to the field of switchgear technology. Background Technology

[0002] Fast grounding switches are an important component of GIS (Gas Insulation System). They are typically installed on the side of the GIS bay's outgoing disconnector close to the line, used to interrupt electrostatic induction currents, electromagnetic induction currents, etc., and are used in conjunction with the disconnector. In high-voltage switches of 126kV and below, since the disconnector usually adopts a shared enclosure design, the grounding switch also adopts a shared enclosure design.

[0003] For example, Chinese invention patent application CN114512365A discloses a three-phase common-box fast grounding switch (i.e., common-box fast grounding switch), which includes a housing, three-phase moving-side shielding conductors, three-phase grounding terminals, three-phase moving contact rods, three-phase crank arms, and an operating mechanism. The three-phase crank arms are rotatably installed in the housing via rotating shafts. Each crank arm includes a first arm and a second arm arranged at an angle. The first arm is driven to drive the moving contact rod to move up and down. A transmission link is hinged to the second arm of each crank arm. The operating mechanism is located outside the housing, and its output end is driven to the rotating shaft of one of the three-phase crank arms.

[0004] The aforementioned common-box fast grounding switch has a three-phase crank arm, a three-phase transition link, and a transmission link inside its housing, forming a crank arm box structure. However, it has a large number of parts, high cost, and complicated assembly operations. Summary of the Invention

[0005] The purpose of this invention is to provide a crank arm box structure to solve the problems of high cost and complicated assembly caused by the large number of parts in the existing crank arm box structure; the purpose of this invention is also to provide a common-enclosure fast grounding switch and GIS to solve the above problems.

[0006] To achieve the above objectives, the crank arm box structure in this invention adopts the following technical solution:

[0007] A crank arm box structure includes a crank arm box and a main shaft mounted on the crank arm box. A crank arm is mounted on the main shaft inside the crank arm box. A transmission bracket is also provided inside the crank arm box. A three-phase moving contact is mounted on the transmission bracket. The transmission bracket is connected to the crank arm for transmission, so that the crank arm drives the transmission bracket to move. A guide structure is provided inside the housing for guiding the movement of the transmission bracket. A grounding insulator electrically connected to the three-phase moving contact is installed on the housing.

[0008] The beneficial effects of the above technical solution are as follows: This invention innovatively provides a crank arm box structure, in which a main shaft is installed, and a crank arm is installed on the main shaft, so that the main shaft can drive the crank arm to rotate; a transmission bracket is also provided inside the crank arm box, and a three-phase moving contact is installed on the transmission bracket. The transmission bracket is connected to the crank arm in a transmission manner, so that when the crank arm rotates, it can drive the transmission bracket to translate, and then the transmission bracket drives the three-phase moving contact to move, realizing the opening and closing operation of the fast grounding switch; at the same time, a guide structure is provided inside the housing to guide the movement of the transmission bracket, so that it can move along the opening and closing direction; a grounding insulator electrically connected to the three-phase moving contact is installed on the housing, so that when closing, the current is conducted through the moving contact to the grounding insulator, and then can flow into the grounding network to realize the grounding function.

[0009] In summary, since the three-phase moving contacts are simultaneously mounted on the transmission bracket, only one rotating shaft and one crank arm are needed. The movement of the transmission bracket drives the movement of the three-phase moving contacts. Compared with existing technologies, this saves the number of crank arms and transition links, and eliminates the transmission link, thus reducing costs and simplifying assembly operations.

[0010] Furthermore, the transmission support is a conductive support, and a conductive strip connects the transmission support and the grounding insulator.

[0011] The beneficial effects of the above technical solution are as follows: the transmission support is a conductive support that can transmit current; a conductive strip connects the transmission support and the grounding insulator, which facilitates the current to be conducted to the grounding insulator through the transmission support and conductive strip when the switch is closed, while not affecting the normal movement of the transmission support.

[0012] Furthermore, the guide structure is a guide rail set on the relative inner wall of the housing, and sliders are respectively set on both sides of the transmission bracket. The sliders are guided and cooperate with the guide rails, and the sliders are insulated sliders.

[0013] The beneficial effects of the above technical solution are: the cooperation between the guide rail and the slider facilitates the movement of the transmission bracket, and the slider is an insulated slider, which can be used as an insulation separator.

[0014] Furthermore, an insulating connecting plate is hinged between the crank arm and the transmission support.

[0015] The beneficial effects of the above technical solution are: adding an insulating connecting plate facilitates the movement of the crank arm driving the transmission bracket, and at the same time, the insulating connecting plate can prevent current from being conducted to the crank arm.

[0016] Furthermore, the transmission support includes a fixing plate for fixing the three-phase moving contacts and a connecting plate connected to the fixing plate, with a conductive strip connecting the grounding insulator and the connecting plate.

[0017] The advantages of the above technical solution are: the fixing plate facilitates the fixing of the three-phase moving contact, and the connecting plate facilitates the connection of the conductive strip between the grounding insulator and the connecting plate, which is convenient for installation.

[0018] Furthermore, the transmission bracket is U-shaped and includes a fixing plate for fixing the three-phase moving contacts and end plates located at both ends of the fixing plate. The slider is fixed on the end plates, and the crank arm is located in the space between the two end plates.

[0019] The advantages of the above technical solution are: it has a compact structure, which makes it convenient to set up the slider and provides space for the arrangement of the crank arm.

[0020] Furthermore, the guide structure is a guide rail set on the relative inner wall of the housing, and sliders are respectively set on both sides of the transmission bracket, with the sliders cooperating with the guide rail for guidance.

[0021] The beneficial effect of the above technical solution is that the cooperation between the guide rail and the slider facilitates the movement of the transmission bracket.

[0022] Furthermore, the transmission bracket is U-shaped and includes a fixing plate for fixing the three-phase moving contacts and end plates located at both ends of the fixing plate. The slider is fixed on the end plates, and the crank arm is located in the space between the two end plates.

[0023] The advantages of the above technical solution are: it has a compact structure, which makes it convenient to set up the slider and provides space for the arrangement of the crank arm.

[0024] To achieve the above objectives, the common-enclosure fast grounding switch in this invention adopts the following technical solution:

[0025] A common-enclosure fast grounding switch includes an operating mechanism and a crank arm box structure. The crank arm box structure includes a crank arm box and a main shaft mounted on the crank arm box. The output end of the operating mechanism is driven to the main shaft to drive the main shaft to rotate. A crank arm is mounted on the main shaft inside the crank arm box. A transmission bracket is also provided inside the crank arm box. A three-phase moving contact is mounted on the transmission bracket. The transmission bracket is driven to the crank arm so that the crank arm can drive the transmission bracket to translate. A guide structure is provided inside the housing to guide the movement of the transmission bracket. A grounding insulator electrically connected to the three-phase moving contact is installed on the housing.

[0026] The beneficial effects of the above technical solution are as follows: The present invention has a main shaft installed inside the crank arm box, and a crank arm installed on the main shaft, so the main shaft can drive the crank arm to rotate; a transmission bracket is also provided inside the crank arm box, and a three-phase moving contact is installed on the transmission bracket. The transmission bracket is connected to the crank arm in a transmission manner, so that when the crank arm rotates, it can drive the transmission bracket to translate, and then the transmission bracket drives the three-phase moving contact to move, realizing the opening and closing operation of the fast grounding switch; at the same time, a guide structure is provided inside the housing to guide the movement of the transmission bracket, facilitating its movement along the opening and closing direction; a grounding insulator electrically connected to the three-phase moving contact is installed on the housing, so that when the switch is closed, the current is conducted through the moving contact to the grounding insulator, and then can flow into the grounding network to realize the grounding function.

[0027] In summary, since the three-phase moving contacts are simultaneously mounted on the transmission bracket, only one rotating shaft and one crank arm are needed. The movement of the transmission bracket drives the movement of the three-phase moving contacts. Compared with existing technologies, this saves the number of crank arms and transition links, and eliminates the transmission link, thus reducing costs and simplifying assembly operations.

[0028] Furthermore, the transmission support is a conductive support, and a conductive strip connects the transmission support and the grounding insulator.

[0029] The beneficial effects of the above technical solution are as follows: the transmission support is a conductive support that can transmit current; a conductive strip connects the transmission support and the grounding insulator, which facilitates the current to be conducted to the grounding insulator through the transmission support and conductive strip when the switch is closed, while not affecting the normal movement of the transmission support.

[0030] Furthermore, the guide structure is a guide rail set on the relative inner wall of the housing, and sliders are respectively set on both sides of the transmission bracket. The sliders are guided and cooperate with the guide rails, and the sliders are insulated sliders.

[0031] The beneficial effects of the above technical solution are: the cooperation between the guide rail and the slider facilitates the movement of the transmission bracket, and the slider is an insulated slider, which can be used as an insulation separator.

[0032] Furthermore, an insulating connecting plate is hinged between the crank arm and the transmission support.

[0033] The beneficial effects of the above technical solution are: adding an insulating connecting plate facilitates the movement of the crank arm driving the transmission bracket, and at the same time, the insulating connecting plate can prevent current from being conducted to the crank arm.

[0034] Furthermore, the transmission support includes a fixing plate for fixing the three-phase moving contacts and a connecting plate connected to the fixing plate, with a conductive strip connecting the grounding insulator and the connecting plate.

[0035] The advantages of the above technical solution are: the fixing plate facilitates the fixing of the three-phase moving contact, and the connecting plate facilitates the connection of the conductive strip between the grounding insulator and the connecting plate, which is convenient for installation.

[0036] Furthermore, the transmission bracket is U-shaped and includes a fixing plate for fixing the three-phase moving contacts and end plates located at both ends of the fixing plate. The slider is fixed on the end plates, and the crank arm is located in the space between the two end plates.

[0037] The advantages of the above technical solution are: it has a compact structure, which makes it convenient to set up the slider and provides space for the arrangement of the crank arm.

[0038] Furthermore, the guide structure is a guide rail set on the relative inner wall of the housing, and sliders are respectively set on both sides of the transmission bracket, with the sliders cooperating with the guide rail for guidance.

[0039] The beneficial effect of the above technical solution is that the cooperation between the guide rail and the slider facilitates the movement of the transmission bracket.

[0040] Furthermore, the transmission bracket is U-shaped and includes a fixing plate for fixing the three-phase moving contacts and end plates located at both ends of the fixing plate. The slider is fixed on the end plates, and the crank arm is located in the space between the two end plates.

[0041] The advantages of the above technical solution are: it has a compact structure, which makes it convenient to set up the slider and provides space for the arrangement of the crank arm.

[0042] To achieve the above objectives, the GIS in this invention adopts the following technical solution:

[0043] A GIS includes a common-enclosure fast grounding switch. The common-enclosure fast grounding switch includes an operating mechanism and a crank arm box structure. The crank arm box structure includes a crank arm box and a main shaft mounted on the crank arm box. The output end of the operating mechanism is driven to the main shaft to drive the main shaft to rotate. A crank arm is mounted on the main shaft inside the crank arm box. A transmission bracket is also provided inside the crank arm box. A three-phase moving contact is mounted on the transmission bracket. The transmission bracket is driven to the crank arm to drive the transmission bracket to translate. A guide structure is provided inside the housing to guide the movement of the transmission bracket. A grounding insulator electrically connected to the three-phase moving contact is installed on the housing.

[0044] The beneficial effects of the above technical solution are as follows: The present invention has a main shaft installed inside the crank arm box, and a crank arm installed on the main shaft, so the main shaft can drive the crank arm to rotate; a transmission bracket is also provided inside the crank arm box, and a three-phase moving contact is installed on the transmission bracket. The transmission bracket is connected to the crank arm in a transmission manner, so that when the crank arm rotates, it can drive the transmission bracket to translate, and then the transmission bracket drives the three-phase moving contact to move, realizing the opening and closing operation of the fast grounding switch; at the same time, a guide structure is provided inside the housing to guide the movement of the transmission bracket, facilitating its movement along the opening and closing direction; a grounding insulator electrically connected to the three-phase moving contact is installed on the housing, so that when the switch is closed, the current is conducted through the moving contact to the grounding insulator, and then can flow into the grounding network to realize the grounding function.

[0045] In summary, since the three-phase moving contacts are simultaneously mounted on the transmission bracket, only one rotating shaft and one crank arm are needed. The movement of the transmission bracket drives the movement of the three-phase moving contacts. Compared with existing technologies, this saves the number of crank arms and transition links, and eliminates the transmission link, thus reducing costs and simplifying assembly operations.

[0046] Furthermore, the transmission support is a conductive support, and a conductive strip connects the transmission support and the grounding insulator.

[0047] The beneficial effects of the above technical solution are as follows: the transmission support is a conductive support that can transmit current; a conductive strip connects the transmission support and the grounding insulator, which facilitates the current to be conducted to the grounding insulator through the transmission support and conductive strip when the switch is closed, while not affecting the normal movement of the transmission support.

[0048] Furthermore, the guide structure is a guide rail set on the relative inner wall of the housing, and sliders are respectively set on both sides of the transmission bracket. The sliders are guided and cooperate with the guide rails, and the sliders are insulated sliders.

[0049] The beneficial effects of the above technical solution are: the cooperation between the guide rail and the slider facilitates the movement of the transmission bracket, and the slider is an insulated slider, which can be used as an insulation separator.

[0050] Furthermore, an insulating connecting plate is hinged between the crank arm and the transmission support.

[0051] The beneficial effects of the above technical solution are: adding an insulating connecting plate facilitates the movement of the crank arm driving the transmission bracket, and at the same time, the insulating connecting plate can prevent current from being conducted to the crank arm.

[0052] Furthermore, the transmission support includes a fixing plate for fixing the three-phase moving contacts and a connecting plate connected to the fixing plate, with a conductive strip connecting the grounding insulator and the connecting plate.

[0053] The advantages of the above technical solution are: the fixing plate facilitates the fixing of the three-phase moving contact, and the connecting plate facilitates the connection of the conductive strip between the grounding insulator and the connecting plate, which is convenient for installation.

[0054] Furthermore, the transmission bracket is U-shaped and includes a fixing plate for fixing the three-phase moving contacts and end plates located at both ends of the fixing plate. The slider is fixed on the end plates, and the crank arm is located in the space between the two end plates.

[0055] The advantages of the above technical solution are: it has a compact structure, which makes it convenient to set up the slider and provides space for the arrangement of the crank arm.

[0056] Furthermore, the guide structure is a guide rail set on the relative inner wall of the housing, and sliders are respectively set on both sides of the transmission bracket, with the sliders cooperating with the guide rail for guidance.

[0057] The beneficial effect of the above technical solution is that the cooperation between the guide rail and the slider facilitates the movement of the transmission bracket.

[0058] Furthermore, the transmission bracket is U-shaped and includes a fixing plate for fixing the three-phase moving contacts and end plates located at both ends of the fixing plate. The slider is fixed on the end plates, and the crank arm is located in the space between the two end plates.

[0059] The advantages of the above technical solution are: it has a compact structure, which makes it convenient to set up the slider and provides space for the arrangement of the crank arm. Attached Figure Description

[0060] Figure 1 This is a front view of the fast grounding switch of the common box of the present invention;

[0061] Figure 2 This is a top view of the fast grounding switch of the common box of the present invention;

[0062] Figure 3 This is a top view of the crank arm box structure in this invention;

[0063] Figure 4 This is a perspective view of the crank arm box structure in this invention;

[0064] Figure 5 This is a cross-sectional view of the crank arm box structure in this invention;

[0065] Figure 6 for Figure 5 Sectional view along line AA in the middle;

[0066] Figure 7 for Figure 5 BB-direction sectional view in the middle;

[0067] Figure 8 This is a perspective view of the transmission support of the crank arm box structure in this invention.

[0068] In the diagram: 1. Operating mechanism; 2. Crank arm box structure; 20. Grounding insulator; 21. Crank arm box; 22. Main shaft; 23. Crank arm; 24. Insulating connecting plate; 25. Transmission bracket; 251. Fixing plate; 252. End plate; 253. Connecting plate; 254. Ear plate; 26. Sliding block; 27. Guide rail; 28. Conductive strip; 29. ​​Cover plate; 210. Moving contact; 3. Disconnecting switch; 31. Grounding switch stationary contact seat. Detailed Implementation

[0069] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0070] Embodiment 1 of the fast grounding switch for the common box of the present invention:

[0071] The present invention mounts the three-phase moving contact inside the crank arm box on a transmission bracket. The transmission bracket can be driven to move by a main shaft and a crank arm. Compared with the prior art, the number of parts is reduced, which can reduce costs and simplify assembly operations.

[0072] Specifically, such as Figure 1 and Figure 2 As shown, the common-enclosure fast grounding switch includes an operating mechanism 1, a crank arm box structure 2, and a disconnecting switch 3. The crank arm box structure 2 is bolted to the housing of the disconnecting switch 3. The main shaft of the crank arm box structure 2 is connected to the output end of the operating mechanism 1. When the fast grounding switch receives an action signal, the operating mechanism 1 outputs torque, which drives the moving contact inside the crank arm box structure 2 to perform the opening and closing operation of the grounding switch. A grounding switch stationary contact seat 31 is provided inside the disconnecting switch 3 for contacting or separating from the moving contact inside the crank arm box structure 2.

[0073] like Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the crank arm box structure includes a crank arm box 21 and a main shaft 22 mounted on the crank arm box 21 via bearings. The crank arm box 21 is a cast box structure made of cast aluminum alloy. The lower flange is an "elliptical" flange for docking with the disconnect switch 3. A circular mounting hole is provided at the upper end to facilitate the assembly of internal components of the crank arm box. After the components are assembled, the cover plate 29 is used to seal it.

[0074] The main spindle 22 is connected to the output end of the operating mechanism 1 and is driven to rotate by the operating mechanism 1. A crank arm 23 is mounted on the main spindle 22 inside the crank arm box 21. When the main spindle 22 rotates, the crank arm 23 rotates synchronously with the main spindle 22. A transmission bracket 25 is also provided inside the crank arm box 21, which, in conjunction with… Figure 8As shown, the transmission bracket 25 is U-shaped, including a fixed plate 251 and end plates 252 located at both ends of the fixed plate 251. Three-phase moving contacts 210 are mounted on the fixed plate 251. An insulating connecting plate 24 is hinged between the crank arm 23 and the transmission bracket 25, so that when the crank arm 23 rotates, it drives the transmission bracket 25 to move linearly and translationally through the insulating connecting plate 24. Furthermore, both the crank arm 23 and the insulating connecting plate 24 are located within the space between the two end plates 252, resulting in a relatively compact structure. In addition, for ease of connection, the transmission bracket 25 also includes two ear plates 254 connected to the fixed plate 251, with one end of the insulating connecting plate 24 hinged between the two ear plates 254.

[0075] In this embodiment, the transmission bracket 25 is a conductive bracket made of cast aluminum alloy, which has good conductivity. The transmission bracket 25 also includes a connecting plate 253 connected to the fixed plate 251. A grounding insulator 20 is installed on the housing 21, and a conductive strip 28 connects the grounding insulator 20 and the connecting plate 253 to realize the electrical connection between the grounding insulator 20 and the three-phase moving contact 210. A guide structure for guiding the movement of the transmission bracket 25 is provided inside the housing 21. The guide structure is a guide rail 27 set on the inner wall of the housing 21. Slider blocks 26 are fixed on the two end plates 252 of the transmission bracket 25, respectively. The sliders 26 guide and cooperate with the guide rails 27. The sliders 26 are wear-resistant insulating sliders, which can be used as insulation separators and can also drive the moving contact 210 to reciprocate on the guide rail inside the crank arm box 21 to realize the opening and closing operation of the grounding switch.

[0076] The working principle of the crank arm box structure in this invention is as follows:

[0077] The components inside the crank arm box use a "crank-slider" structure for transmission. The sequence of motion is as follows: the output torque of the operating mechanism 1 drives the crank arm 23 and the insulating connecting plate 24 to move through the rotation of the main shaft 22, which in turn causes the transmission bracket 25 to drive the three-phase moving contact 210 to move linearly under the guidance of the two guide rails 27. When the fast grounding switch is closed, the current flows through the A, B, and C three-phase moving contacts 210 on the transmission bracket 25, the transmission bracket 25, the conductive strip 28, and the grounding insulator 20 into the grounding network of the power station.

[0078] In summary, since the three-phase moving contacts are simultaneously mounted on the transmission bracket in this invention, only one rotating shaft, one crank arm, and one insulating connecting plate are needed. The movement of the transmission bracket drives the three-phase moving contacts to move. Compared with the prior art, this invention saves the number of crank arms and transition links, and eliminates the transmission link, thus reducing costs and simplifying assembly operations.

[0079] In other embodiments of the common-box fast grounding switch: This embodiment provides a different structural form of the transmission bracket. Unlike embodiment 1, the transmission bracket is not U-shaped, but includes a flat fixed plate, in which case the slider is directly connected to both ends of the fixed plate.

[0080] In other embodiments of the common box fast grounding switch: This embodiment provides different structural forms of the guide structure. Unlike embodiment 1, the guide structure is not a guide rail that cooperates with the slider, but a guide rail that cooperates with the groove. That is, the two ends of the transmission bracket are machined with grooves.

[0081] In other embodiments of the common box fast grounding switch: This embodiment provides different fixing methods for the conductive strip. Unlike embodiment 1, one end of the conductive strip is directly fixed to the fixing plate of the transmission bracket, thereby eliminating the need for a connecting plate.

[0082] In other embodiments of the common box fast grounding switch: This embodiment provides a different transmission method between the crank arm and the transmission bracket. Unlike embodiment 1, the two are not connected by an insulating connecting plate, but are directly hinged. In this case, in order to avoid jamming, an elongated hole needs to be set on one of them.

[0083] In other embodiments of the common box fast grounding switch: This embodiment provides other electrical connection methods for the grounding insulator and the three-phase moving contact. Unlike embodiment 1, the transmission support is not a conductive support, and no conductive strip is provided. In this case, a fixed block is fixed on the crank arm box for the moving contact to pass through and to conduct electricity with the moving contact. The fixed block is electrically connected to the grounding insulator through a conductive busbar.

[0084] The embodiment of the crank arm box structure in this invention is as follows: The specific structure of the crank arm box structure is the same as that of the crank arm box structure in the above embodiment of the common box fast grounding switch, and will not be repeated here.

[0085] The embodiment of GIS in this invention is as follows: GIS includes a common box fast grounding switch, the common box fast grounding switch includes an operating mechanism and a crank arm box structure, the specific structure of the crank arm box structure is the same as the crank arm box structure in the above embodiment of the common box fast grounding switch, and will not be repeated here.

[0086] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A crank-arm box structure, characterized in that, The device includes a crank arm box (21) and a main shaft (22) mounted on the crank arm box (21). A crank arm (23) is mounted on the main shaft (22) inside the crank arm box (21). A transmission bracket (25) is also provided inside the crank arm box (21). The transmission bracket is a conductive bracket. The transmission bracket includes a fixed plate and end plates located at both ends of the fixed plate in the length direction. The fixed plate and the two end plates are U-shaped. Three-phase moving contacts are installed at intervals along the length direction on the fixed plate. An insulating connecting plate is hinged between the transmission bracket and the crank arm. The transmission bracket also includes two ear plates connected to the middle of the fixed plate and arranged at intervals along the width direction of the fixed plate. One end of the insulating connecting plate is hinged between the two ear plates so that the transmission bracket can be driven to translate through the insulating connecting plate when the crank arm rotates. Guide rails for guiding the movement of the transmission bracket are respectively provided on the relative inner walls of the crank arm box. Slider blocks are fixed on the two end plates respectively. The sliders are guided and cooperate with the guide rails. The sliders are insulated sliders. A grounding insulator (20) electrically connected to the three-phase moving contacts (210) is installed on the crank arm box.

2. The crank arm box structure according to claim 1, characterized in that, A conductive strip (28) is connected between the transmission bracket (25) and the grounding insulator (20) to realize the electrical connection between the grounding insulator and the three-phase moving contact.

3. The crank arm box structure according to claim 2, characterized in that, The transmission support also includes a connecting plate connected to the fixed plate, and a conductive strip is connected between the grounding insulator and the connecting plate.

4. The crank arm box structure according to claim 3, characterized in that, The connecting plate is located between the two end plates and is arranged perpendicular to the fixing plate. The thickness direction of the connecting plate is perpendicular to the thickness direction of the end plates. The grounding insulator is installed on the side wall of the crank arm box located on the side of the transmission bracket in the width direction.

5. The crank arm box structure according to claim 4, characterized in that, The connecting plate is located between the lug plate and one of the end plates to avoid the crank arm located between the lug plate and the other end plate.

6. The crank arm box structure according to any one of claims 1 to 5, characterized in that, The transmission bracket is made of cast aluminum alloy.

7. The crank arm box structure according to any one of claims 1 to 5, characterized in that... The crank arm box is a cast box structure made of cast aluminum alloy.

8. The crank arm box structure according to claim 7, characterized in that, The flange of the crank arm box used for docking with the disconnecting switch is an oval flange.

9. A common-enclosure fast grounding switch, comprising an operating mechanism (1) and a crank arm box structure (2), characterized in that, The crank arm box structure includes a crank arm box (21) and a main shaft (22) mounted on the crank arm box (21). A crank arm (23) is mounted on the main shaft (22) inside the crank arm box (21). A transmission bracket (25) is also provided inside the crank arm box (21). The transmission bracket is a conductive bracket. The transmission bracket includes a fixed plate and end plates located at both ends of the fixed plate along its length. The fixed plate and the two end plates are U-shaped. Three-phase moving contacts are installed at intervals along the length of the fixed plate. An insulating connecting plate is hinged between the transmission bracket and the crank arm. The moving support also includes two ear plates connected to the middle of the fixed plate and spaced apart along the width of the fixed plate. One end of the insulating connecting plate is hinged between the two ear plates so that when the crank arm rotates, it drives the transmission support to move through the insulating connecting plate. The inner walls of the crank arm box are respectively provided with guide rails for guiding the movement of the transmission support. The two end plates are respectively fixed with sliders. The sliders are guided and cooperate with the guide rails. The sliders are insulated sliders. The crank arm box is equipped with a grounding insulator (20) that is electrically connected to the three-phase moving contact (210).

10. The common-enclosure fast grounding switch according to claim 9, characterized in that, A conductive strip (28) is connected between the transmission bracket (25) and the grounding insulator (20) to realize the electrical connection between the grounding insulator and the three-phase moving contact.

11. The common-enclosure fast grounding switch according to claim 10, characterized in that, The transmission support also includes a connecting plate connected to the fixed plate, and a conductive strip is connected between the grounding insulator and the connecting plate.

12. The common-enclosure fast grounding switch according to claim 11, characterized in that, The connecting plate is located between the two end plates and is arranged perpendicular to the fixing plate. The thickness direction of the connecting plate is perpendicular to the thickness direction of the end plates. The grounding insulator is installed on the side wall of the crank arm box located on the side of the transmission bracket in the width direction.

13. The common-enclosure fast grounding switch according to claim 12, characterized in that, The connecting plate is located between the lug plate and one of the end plates to avoid the crank arm located between the lug plate and the other end plate.

14. The common-enclosure fast grounding switch according to any one of claims 9 to 13, characterized in that, The transmission bracket is made of cast aluminum alloy.

15. The common-enclosure fast grounding switch according to any one of claims 9 to 13, characterized in that, The crank arm box is a cast box structure made of cast aluminum alloy.

16. The common-enclosure fast grounding switch according to claim 15, characterized in that, The flange of the crank arm box used for docking with the disconnecting switch is an oval flange.

17. A GIS, comprising a common-enclosure fast grounding switch, the common-enclosure fast grounding switch comprising an operating mechanism (1) and a crank arm box structure (2), characterized in that, The crank arm box structure includes a crank arm box (21) and a main shaft (22) mounted on the crank arm box (21). A crank arm (23) is mounted on the main shaft (22) inside the crank arm box (21). A transmission bracket (25) is also provided inside the crank arm box (21). The transmission bracket is a conductive bracket. The transmission bracket includes a fixed plate and end plates located at both ends of the fixed plate along its length. The fixed plate and the two end plates are U-shaped. Three-phase moving contacts are installed at intervals along the length of the fixed plate. An insulating connecting plate is hinged between the transmission bracket and the crank arm. The moving support also includes two ear plates connected to the middle of the fixed plate and spaced apart along the width of the fixed plate. One end of the insulating connecting plate is hinged between the two ear plates so that when the crank arm rotates, it drives the transmission support to move through the insulating connecting plate. The inner walls of the crank arm box are respectively provided with guide rails for guiding the movement of the transmission support. The two end plates are respectively fixed with sliders. The sliders are guided and cooperate with the guide rails. The sliders are insulated sliders. The crank arm box is equipped with a grounding insulator (20) that is electrically connected to the three-phase moving contact (210).

18. The GIS according to claim 17, characterized in that, A conductive strip (28) is connected between the transmission bracket (25) and the grounding insulator (20) to realize the electrical connection between the grounding insulator and the three-phase moving contact.

19. The GIS according to claim 18, characterized in that, The transmission support also includes a connecting plate connected to the fixed plate, and a conductive strip is connected between the grounding insulator and the connecting plate.

20. The GIS according to claim 19, characterized in that, The connecting plate is located between the two end plates and is arranged perpendicular to the fixing plate. The thickness direction of the connecting plate is perpendicular to the thickness direction of the end plates. The grounding insulator is installed on the side wall of the crank arm box located on the side of the transmission bracket in the width direction.

21. The GIS according to claim 20, characterized in that, The connecting plate is located between the lug plate and one of the end plates to avoid the crank arm located between the lug plate and the other end plate.

22. The GIS according to any one of claims 17 to 21, characterized in that, The transmission bracket is made of cast aluminum alloy.

23. The GIS according to any one of claims 17 to 21, characterized in that, The crank arm box is a cast box structure made of cast aluminum alloy.

24. The GIS according to claim 23, characterized in that, The flange of the crank arm box used for docking with the disconnecting switch is an oval flange.

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