Grounding knife interlocking mechanism of switch cabinet

Abstract

The utility model discloses a grounding knife interlocking mechanism of a switch cabinet. The grounding knife interlocking mechanism comprises an operation shaft, a front door interlocking assembly and a rear door interlocking assembly. The rear door interlocking assembly comprises a rear door mounting plate, a clutch assembly and a transmission assembly, the clutch assembly comprises a main shaft sleeve and a slave shaft sleeve, the main shaft sleeve movably sleeves one end of the operation shaft, the slave shaft sleeve is fixedly sleeved on the operation shaft, and the slave shaft sleeve is connected with the electric grounding knife switch main shaft through the transmission assembly; the front door interlocking assembly comprises a support assembly, a small valve, a handcart interlocking assembly, a padlock assembly and a first elastic piece; the other end of the operation shaft is rotatably installed on the support assembly, the small valve is installed on the support assembly in a sliding mode, the handcart interlocking assembly is installed on the lower portion of the small valve, the padlock assembly is located in the middle of the small valve, and the two ends of the first elastic piece are connected with the small valve and the support assembly respectively and used for pulling the small valve upwards to a preset position. The utility model has the advantages of simple structure, reliable work and the like.

Description

TECHNICAL FIELD

[0001] The utility model mainly relates to the technical field of switch cabinet, specifically relates to a switch cabinet's ground knife interlocking mechanism. BACKGROUND

[0002] KYN61-40.5 (Z) armored movable AC metal-enclosed switch cabinet is a three-phase AC power supply device with 50Hz and 40.5kV rated voltage, which is used in indoor for receiving and distributing electric energy, and has the functions of control, protection and detection, and can also be used in frequently operated places.

[0003] It needs to have five protection functions: (1) prevent misoperation of circuit breaker; (2) prevent closing isolation switch with load; (3) prevent connecting ground wire (ground knife) with live line; (4) prevent closing circuit breaker (isolation switch) with ground wire (ground knife); (5) prevent entering live compartment. CONTENT OF THE UTILITY MODEL

[0004] In view of the technical problems in the prior art, the utility model provides a switch cabinet ground knife interlocking mechanism which is simple in structure and reliable in operation.

[0005] To solve the above technical problems, the technical scheme provided by the utility model is:

[0006] A switch cabinet ground knife interlocking mechanism, comprising an operating shaft, a front door interlocking assembly and a rear door interlocking assembly; the rear door interlocking assembly comprises a rear door mounting plate, a clutch assembly and a transmission assembly, the clutch assembly comprises a main shaft sleeve and a slave shaft sleeve, the main shaft sleeve is movably sleeved on one end of the operating shaft, the slave shaft sleeve is tightly sleeved on the operating shaft, and the slave shaft sleeve is connected with an electric ground knife main shaft through the transmission assembly;

[0007] The front door interlocking assembly comprises a support assembly, a small flap, a handcart interlocking assembly, a padlock assembly and a first elastic member; the other end of the operating shaft is rotatably installed on the support assembly, the small flap is slidably installed on the support assembly, the handcart interlocking assembly is installed on the lower part of the small flap, the padlock assembly is located in the middle part of the small flap, and the two ends of the first elastic member are connected with the small flap and the support assembly respectively, and the first elastic member is used for pulling the small flap upward to a preset position.

[0008] As a further improvement of the above technical scheme:

[0009] The handcart interlocking assembly comprises an interlocking guide, a handcart interlocking plate and a positioning screw; the small flap is provided with an interlocking groove, the interlocking guide is sleeved on the lower end of the small flap, the handcart interlocking plate is slidably arranged on the interlocking guide, and the positioning screw is located in the interlocking groove after penetrating through the handcart interlocking plate.

[0010] The padlock assembly comprises a mounting shaft, a torsion spring and a padlock plate; the padlock plate is mounted on the small door through the mounting shaft, and the torsion spring is located on the mounting shaft; the small door is provided with a padlock hole.

[0011] The support assembly is provided with a travel switch for triggering to disconnect the electric ground knife circuit when the small door slides downward.

[0012] The operating shaft is further provided with a position confirmation assembly, the position confirmation assembly comprises a plurality of sector plates and a position confirmation switch, the plurality of sector plates are mounted on the operating shaft, and the position confirmation switch is located on one side of a movement track of the sector plates.

[0013] The operating shaft is further provided with a limiting assembly, the limiting assembly comprises a limiting plate and a limiting block, the limiting plate is mounted on the operating shaft, and the limiting block is mounted on the support assembly and located in a limiting groove of the limiting plate.

[0014] The rear door mounting plate is provided with a second elastic member, and two ends of the second elastic member are respectively connected with the main shaft sleeve and the rear door mounting plate.

[0015] The transmission assembly comprises a crank arm and a pull rod, the crank arm is sleeved on the operating shaft and is fastened on the operating shaft, one end of the pull rod is movably connected with the crank arm, and the other end of the pull rod is movably connected with the electric ground knife main shaft.

[0016] The rear door mounting plate is provided with a limiting groove arranged in the axial direction of the operating shaft, the main shaft sleeve is connected with a limiting strip, and the limiting strip is slidably arranged in the limiting groove; the limiting strip is connected with a thimble, and the thimble abuts against the rear door.

[0017] Compared with the prior art, the switch cabinet ground knife interlocking mechanism has the following advantages:

[0018] The switch cabinet ground knife interlocking mechanism combines the rear door interlocking assembly, the operating shaft and the front door interlocking assembly together, the rear door interlocking assembly is responsible for the opening and closing interlocking of the ground knife and the locking with the rear door, which helps to prevent misoperation, such as entering the live interval, and ensures the safety of the maintenance personnel; the front door interlocking assembly can realize the electric operation of the ground knife, but has priority in manual operation; this increases the flexibility of operation and allows manual rapid operation when the power system fails, thereby improving the ability to cope with emergency situations.

[0019] The switch cabinet ground knife interlocking mechanism can be electrically interlocked with the high-voltage line, interlocked with the handcart, and the position of the ground knife is confirmed, and these functions help to achieve the "five prevention" goal, that is, to prevent live hanging (closing) grounding wire (ground knife switch), to prevent grounding wire (ground knife switch) from closing circuit breaker (isolating switch), etc., to ensure the stable operation of the system and the safety of personnel.

[0020] The utility model discloses through the rotation of operating shaft, can linkage crank and pull rod, thereby simplified the operation process of ground cutter, reduced the operation difficulty. Through the design of transmission assembly, realized the connection of operating shaft and electric ground cutter main shaft, not only ensured the reliability of operation, and can conveniently maintain and replace when the failure occurs. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the embodiment drawing of the ground cutter interlock mechanism of the utility model in specific application.

[0022] Figure 2 It is the structure drawing of the ground cutter interlock mechanism of the utility model in embodiment, (a) is the main view, (b) is the plan.

[0023] Figure 3 It is the three -dimensional structure diagram and explosion drawing of the ground cutter interlock mechanism of the utility model in embodiment, (a) is the perspective view, (b) is the explosion drawing.

[0024] Figure 4 It is the structure drawing of padlock assembly of the utility model in embodiment, (a) is the main view, (b) is the side view, (c) is the explosion drawing.

[0025] Figure 5 It is the three -dimensional structure diagram of limiting component of the utility model in embodiment.

[0026] Figure 6 It is the three -dimensional structure diagram of front door interlock assembly of the utility model in embodiment, (a) is the whole diagram, (b)-(c) is the internal diagram.

[0027] Figure 7 It is the working state schematic drawing of the utility model.

[0028] Legend: 1, rear door interlock assembly;101, clutch assembly;1011, main shaft sleeve;1012, from axle sleeve;102, rear door mounting plate;103, transmission assembly;1031, crank;1032, pull rod;104, second elastic part;105, positioning axle sleeve;2, operating shaft;3, front door interlock assembly;301, support assembly;3011, sliding block;302, small valve;3021, operating handle;3022, operating hole;303, handcart interlock assembly;3031, interlock guide;3032, handcart interlock plate;3033, positioning screw;3034, interlock groove;304, padlock assembly;3041, mounting shaft;3042, padlock plate;3043, torsional spring;3044, padlock hole;305, first elastic part;306, limiting component;3061, limiting plate;3062, limiting block;307, position confirmation assembly;3071, position confirmation switch;3072, sector plate;308, travel switch;309, electromagnetic lock;4, electric ground cutter. DETAILED DESCRIPTION

[0029] The utility model is further described below in combination with the drawings and specific embodiments of the utility model.

[0030] As Figures 1-2 shown, the switch cabinet ground knife interlocking mechanism provided by the utility model embodiment, the overall structure includes three parts, is rear door interlocking assembly 1, operating shaft 2 and front door interlocking assembly 3 respectively;Above-mentioned each part is installed in the downside of the right side plate of cabinet body;Wherein rear door interlocking assembly 1 is responsible for ground knife opening and closing interlock and with rear door locking (five prevent: prevent mistake and enter electrified compartment);Specific structure includes rear door mounting plate 102, clutch assembly 101 and transmission assembly 103, wherein clutch assembly 101 includes main shaft sleeve 1011 and shaft sleeve 1012, main shaft sleeve 1011 is movably sleeved in one end of operating shaft 2, and shaft sleeve 1012 is sleeved and fastened on operating shaft 2. One end of operating shaft 2 is rotatably installed on rear door mounting plate 102 through positioning shaft sleeve 105, and shaft sleeve 1012 is connected with electric ground knife 4 main shaft through transmission assembly 103;Specifically, transmission assembly 103 includes crank arm 1031 and pull rod 1032, crank arm 1031 is sleeved on operating shaft 2 and is fastened on operating shaft 2, one end of pull rod 1032 is movably connected with crank arm 1031, and the other end is movably connected with electric ground knife 4 main shaft;In the case where the main shaft sleeve 1011 of clutch assembly 101 and the shaft sleeve 1012 are mutually sleeved, the rotation of operating shaft 2 drives the rotation of crank arm 1031, and then the rotation of electric ground knife 4 main shaft is driven through pull rod 1032;Front door interlocking assembly 3 can specifically realize the logic control of ground knife electric operation but manual priority, electrical interlocking with high-voltage line, interlocking with handcart and confirming ground knife position (five prevent: prevent electrified hanging (combination) grounding wire (ground knife gap), prevent grounding wire (ground knife gap) and circuit breaker (disconnector) combination) functions.

[0031] The switch cabinet ground knife interlocking mechanism of the utility model combines rear door interlocking assembly 1, operating shaft 2 and front door interlocking assembly 3 together, wherein rear door interlocking assembly 1 is responsible for the opening and closing interlock of ground knife and the locking of rear door, which helps to prevent misoperation, such as mistake and enter electrified compartment, and ensures the safety of maintenance personnel;Front door interlocking assembly 1 can realize the electric operation of ground knife, but has priority in manual operation;This increases the flexibility of operation and allows manual rapid operation when the power system fails, thereby improving the ability to respond to emergency situations.

[0032] The utility model can be electrically interlocked with high-voltage lines, interlocked with handcarts, and confirm the position of ground knife, which helps to achieve the "five prevention" goal, i.e. prevent electrified hanging (combination) grounding wire (ground knife gap), prevent grounding wire (ground knife gap) and circuit breaker (disconnector) combination, etc., to ensure stable operation of the system and safety of personnel.

[0033] The utility model discloses through the rotation of operating shaft 2, can linkage crank arm 1031 and pull rod 1032 to the operation process of ground cutter is simplified thereby, reduced the operation difficulty. Through the design of transmission assembly 103, realized operating shaft 2 and electric ground cutter 4 main shaft's connection, not only ensured the reliability of operation, and can conveniently maintain and replace when failure occurs.

[0034] The utility model discloses compact overall structure design can be installed in the downside of the right side plate of cabinet body, does not occupy the extra space, is applicable to the place of limited space.

[0035] As Figure 3 The other end of operating shaft 2 is rotatably installed on support assembly 301, and small flap 302 is slidably installed on support assembly 301 through sliding block 3011; handcart interlocking assembly 303 is installed on the lower part of small flap 302; padlock assembly 304 is located in the middle part of small flap 302; and the two ends of first elastic member 305 are connected with small flap 302 and support assembly 301 respectively, for pulling small flap 302 upward to a preset position.

[0036] As Figure 3 Interlocking slot 3034 is provided on small flap 302, interlocking guide 3031 is sleeved on the lower end of small flap 302, handcart interlocking plate 3032 is slidably arranged on interlocking guide 3031, and positioning bolt is located in interlocking slot 3034 after passing through handcart interlocking plate 3032. Interlocking slot 3034 is an exhibition slot, when small flap 302 moves up and down, handcart interlocking plate 3032 moves up and down through the positioning slot; during the up-and-down movement of small flap 302, the corresponding positioning bolt also slides in the special-shaped slot, the trajectory of the positioning bolt is limited through the special-shaped slot, and then handcart interlocking plate 3032 extends left and right out of interlocking guide 3031, realizing the interlocking and unlocking of the handcart.

[0037] As Figure 4 Padlock assembly 304 includes mounting shaft 3041, torsional spring 3043 and padlock plate 3042; padlock plate 3042 is installed on small flap 302 through mounting shaft 3041, and torsional spring 3043 is located on mounting shaft 3041; small flap 302 is provided with padlock hole 3044. Through the torsion of torsional spring 3043, padlock plate 3042 can extend out of padlock hole 3044 of small flap 302, and then padlock operation is realized.

[0038] Specifically, the support assembly 301 is provided with a manual priority stroke switch 308 for triggering to disconnect the electric door closer 4 circuit when the small door 302 slides downward.

[0039] Specifically, the operating shaft 2 is further provided with a position confirmation assembly 307, which includes a plurality of sector plates 3072 installed on the operating shaft 2 and a position confirmation switch 3071 located on one side of the movement track of the sector plates 3072. When the operating shaft 2 rotates, the sector plates 3072 on the operating shaft 2 also rotate synchronously, thereby triggering the position confirmation switch 3071, and thereby achieving detection and confirmation of the position of the operating shaft 2.

[0040] As shown in Figure 5 , the operating shaft 2 is further provided with a limiting assembly 306, which includes a limiting plate 3061 installed on the operating shaft 2 and a limiting block 3062 installed on the support assembly 301 and located in the limiting groove of the limiting plate 3061. Through the cooperation between the limiting plate 3061 and the limiting block 3062, the rotation angle of the operating shaft 2 is limited.

[0041] As shown in Figure 6 , the rear door mounting plate 102 is provided with a limiting groove arranged along the axial direction of the operating shaft, the main shaft sleeve 1011 is connected with a limiting strip, and the limiting strip is slidably arranged in the limiting groove; the limiting strip is connected with a thimble, and the thimble abuts against the rear door. In addition, a second elastic member 104 (such as a second tension spring) is installed on the rear door mounting plate 102, and the two ends of the second elastic member 104 are respectively connected with the main shaft sleeve 1011 and the rear door mounting plate 102. Through the pulling of the second elastic member 104, the main shaft sleeve 1011 can move to the rear door position, ensuring the normal fitting between the main shaft sleeve 1011 and the slave shaft sleeve 1012; when the rear door is closed, the rear door pushes the thimble in the direction of the front door, so that the main shaft sleeve 1011 moves in the direction of the front door and separates from the slave shaft sleeve 1012.

[0042] As shown in Figure 3 , the transmission assembly 103 includes a toggle arm 1031 and a pull rod 1032, the toggle arm 1031 is sleeved on the operating shaft 2 and is fastened to the operating shaft 2, one end of the pull rod 1032 is movably connected with the toggle arm 1031, and the other end of the pull rod 1032 is movably connected with the main shaft of the electric door closer 4. Through the rotation of the operating shaft 2, the main shaft of the electric door closer 4 is driven to rotate through the toggle arm 1031 and the pull rod 1032.

[0043] As shown in Figure 6As shown, the front door interlocking assembly 3 working logic and implementation principle is: initially, the trolley is closed and in the working position, the ground knife is open, the small door 302 is guided to the initial position by the first tension spring through the slider 3011, the small door 302 blocks the side plate operation hole 3022, the padlock plate 3042 is twisted by the torsion spring 3043, and the padlock hole 3044 is opened on the small door 302. The padlock can be mechanically locked outside the cabinet at this time;

[0044] When the trolley is open and in the test position, the trolley interlocking plate 3032 moves to the left without resistance from the trolley related mechanism, and the line sensor detects that the line is not live, the locking electromagnet receives an electrical signal, the locking tongue moves backward to unlock (line electrical interlocking), at this time the small door 302 can be moved downward by pressing the operation handle 3021 to expose the manual operation hole 3022, and the protruding edge above the small door 302 hits the manual priority travel switch 308 to transmit an electrical signal for disconnecting the electric ground knife 4 line, realizing manual priority operation; At the same time, the padlock plate 3042 is pressed into the inside of the small door 302, and the trolley interlocking plate 3032 moves to the left through the small door 302 interlocking slot 3034 (guide hole) and the small door 302 plate, which can lock the trolley, so that the trolley cannot be closed and moved to the working position, realizing mutual locking with the trolley;

[0045] The two position confirmation switches 3071 in the position confirmation assembly 307 are interconnected with the sector plate 3072 on the operation shaft 2, and when the operation shaft 2 rotates, the rotational position can be sensed to send an electrical signal, realizing the ground knife position confirmation function.

[0046] The above working logic can be simply described as: 1. Only when the padlock plate 3042 is not locked, the trolley is open and in the test position, and the line is not live, the small door 302 can be pressed down to open, exposing the operation hole 3022;

[0047] 2. When the small door 302 is in the pressed position, it collides with the manual priority travel switch 308 to send an electrical signal to disconnect the ground knife electric operation line, realizing manual priority operation; and the trolley interlocking plate moves to the left to lock the trolley, so that it cannot be closed and moved to the working position;

[0048] 3. The operation shaft 2 rotates and collides with the position confirmation auxiliary switch to realize the position confirmation function.

[0049] As shown in Figure 7 The working principle of the rear door interlocking and ground knife opening and closing is as follows:

[0050] Close operation: when the small valve 302 is opened, press the operating handle 3021, expose the operating hole 3022, insert the operating shaft 2 along the pointer, the crank arm 1031 is driven by the operating shaft 2 to move upward, the crank arm 1031 is connected with the main shaft below, controls the closing of the main shaft, opens the back door (the back door is connected with the main shaft, not shown in the figure), at this time, the main shaft sleeve 1011 is sleeved with the slave shaft sleeve 1012 under the second tension spring, the operating shaft 2 is locked and cannot be rotated;

[0051] Open operation: close the back door, the back door plate presses the main shaft sleeve 1011 to move forward, the main shaft sleeve 1011 is separated from the slave shaft sleeve 1012 to be unlocked, the operating shaft 2 is counterclockwise, the crank arm 1031 is driven by the operating shaft 2 to move downward, the ground knife is opened, and the back door is locked (the back door is connected with the main shaft, not shown in the figure);

[0052] The above working logic can be simply described as: only when the ground knife is closed, the back door can be opened; only when the back door is closed, the ground knife can be opened.

[0053] Related term explanation:

[0054] Trolley test position: when the trolley test position, the primary circuit is not connected, the trolley and the cabinet isolation contact maintain a certain safety distance, but the secondary circuit can be connected, and the circuit breaker can be operated. Test position allows testing of secondary circuit and circuit breaker action to ensure normal operation.

[0055] Trolley working position: when the trolley switch is in the working position, the primary circuit and the secondary circuit are safely connected, all components in the switch cabinet are in working condition, and the circuit breaker can be operated at any time. This state is called hot standby state.

[0056] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model.

[0057] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0058] In the utility model, unless another explicit provision and limitation, the terms "assemble", "connect", "connect", "fix" and so on should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated; can be mechanical connection, also can be electrical connection; can be direct connection, also can indirectly connect through the intermediate medium, can be two element internal communication or two element mutual action relation. For ordinary skilled person in the art, can understand the specific meaning of the above terms in the utility model according to specific circumstances.

[0059] The above is only preferred embodiment of the utility model, the protection scope of the utility model is not only limited to the above-mentioned embodiment, and all technical schemes under the idea of the utility model belong to the protection scope of the utility model for the person skilled in the art. It should be pointed out that for ordinary skilled person in the art, several improvements and decorations without departing from the principle of the utility model are considered as the protection scope of the utility model.

Claims

1. A grounding interlock mechanism for a switchgear, characterized in that, It includes an operating shaft (2), a front door interlock assembly (3), and a rear door interlock assembly (1); the rear door interlock assembly (1) includes a rear door mounting plate (102), a clutch assembly (101), and a transmission assembly (103). The clutch assembly (101) includes a main shaft sleeve (1011) and a driven shaft sleeve (1012). The main shaft sleeve (1011) is movably sleeved on one end of the operating shaft (2), and the driven shaft sleeve (1012) is tightly sleeved on the operating shaft (2). The driven shaft sleeve (1012) is connected to the main shaft of the electric floor knife (4) through the transmission assembly (103). The front door interlock assembly (3) includes a support assembly (301), a small valve (302), a handcart interlock assembly (303), a padlock assembly (304), and a first elastic element (305). The other end of the operating shaft (2) is rotatably mounted on the support assembly (301), the small valve (302) is slidably mounted on the support assembly (301), the handcart interlock assembly (303) is mounted on the lower part of the small valve (302), the padlock assembly (304) is located in the middle of the small valve (302), and the two ends of the first elastic element (305) are respectively connected to the small valve (302) and the support assembly (301) to pull the small valve (302) upward to a preset position.

2. The grounding interlock mechanism of the switchgear according to claim 1, characterized in that, The handcart interlocking assembly (303) includes an interlocking guide (3031), a handcart interlocking plate (3032), and a positioning screw (3033); the small valve (302) is provided with an interlocking groove (3034), the interlocking guide (3031) is sleeved on the lower end of the small valve (302), the handcart interlocking plate (3032) is slidably mounted on the interlocking guide (3031), and the positioning screw (3033) passes through the handcart interlocking plate (3032) and is located in the interlocking groove (3034).

3. The grounding interlock mechanism of the switchgear according to claim 1, characterized in that, The padlock assembly (304) includes a mounting shaft (3041), a torsion spring (3043), and a padlock plate (3042); the padlock plate (3042) is mounted on the small door (302) via the mounting shaft (3041), and the torsion spring (3043) is located on the mounting shaft (3041); the small door (302) is provided with a padlock hole (3044).

4. The grounding interlock mechanism of the switchgear according to claim 1, 2, or 3, characterized in that, The support assembly (301) is provided with a limit switch (308) for triggering when the small valve (302) slides down to disconnect the electric floor knife (4) circuit.

5. The grounding interlock mechanism of the switchgear according to claim 1, 2, or 3, characterized in that, The operating shaft (2) is also provided with a position confirmation component (307), which includes multiple sector plates (3072) and a position confirmation switch (3071). The multiple sector plates (3072) are installed on the operating shaft (2), and the position confirmation switch (3071) is located on one side of the movement trajectory of the sector plates (3072).

6. The grounding interlock mechanism of the switchgear according to claim 1, 2, or 3, characterized in that, The operating shaft (2) is also provided with a limiting component (306), which includes a limiting plate (3061) and a limiting block (3062). The limiting plate (3061) is installed on the operating shaft (2), and the limiting block (3062) is installed on the support component (301) and located in the limiting groove of the limiting plate (3061).

7. The grounding interlock mechanism of the switchgear according to claim 1, 2, or 3, characterized in that, A second elastic element (104) is installed on the rear door mounting plate (102), and the two ends of the second elastic element (104) are respectively connected to the main shaft sleeve (1011) and the rear door mounting plate (102).

8. The grounding interlock mechanism of the switchgear according to claim 1, 2, or 3, characterized in that, The transmission assembly (103) includes a crank arm (1031) and a pull rod (1032). The crank arm (1031) is sleeved on the operating shaft (2) and fastened to the operating shaft (2). One end of the pull rod (1032) is movably connected to the crank arm (1031), and the other end of the pull rod (1032) is movably connected to the main shaft of the electric ground knife (4).

9. The grounding interlock mechanism of the switchgear according to claim 1, 2, or 3, characterized in that, The rear door mounting plate (102) is provided with a limiting groove arranged along the axial direction of the operating shaft (2). The main shaft sleeve (1011) is connected to a limiting strip, which slides in the limiting groove. A pin is connected to the limiting strip, and the pin abuts against the rear door.

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