A general-purpose grounding trolley circuit breaker for medium-voltage switchgear

Abstract

The present invention provides a universal grounding trolley circuit breaker for a medium-voltage switchgear, effectively solving the problem that the circuit breakers of existing grounding trolleys lack unity, resulting in a cumbersome overhaul process, large human and time inputs, and low overhaul efficiency. The technical solution adopted is as follows: It includes the circuit breaker of the grounding trolley, and the circuit breaker includes a telescopic door, a locking shutter control module, and a bracket for installing moving contacts. There is a grounding copper bar on the right side of the bracket, and the grounding copper bars are fixed together through a plurality of insulating lightning arresters. There are a moving contact lifting module and a moving contact phase spacing control module on the bracket. The moving contact lifting module includes a plurality of lead screw-nut mechanisms, where the nuts are fixed on the bracket and the lead screws are installed on the telescopic door. The structure of the present invention is ingenious, with multiple functions in one vehicle, standardization of the grounding trolley, reduction of the number of spare parts to be configured, optimization of the overhaul operation process, reduction of human and time inputs, and reduction of maintenance and repair costs; it is beneficial to improving the safe operation stability of the power grid.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment circuit breakers, and in particular to a general-purpose grounding trolley circuit breaker for medium-mounted cabinets. Background Art

[0002] The KYN28-12 type medium-mounted cabinet has been widely used in substations of power systems, as well as in distribution rooms of other industrial and mining enterprises and residential communities. The medium-mounted cabinet features a convenient handcart-type switchgear and is deeply welcomed by users. According to the usage experience of the KYN28 cabinet, the width of the PT cabinet is mainly 800mm and 1000mm at present. For the other two cabinets with different widths, the phase spacing of the static contacts is also different, and the phase spacing of the static contacts also varies slightly according to different requirements. Due to the above reasons, during the maintenance process, it is necessary to equip separate-sized grounding circuit breaker handcarts according to different cabinet sizes and specifications, lacking unity and standardization, resulting in a rather cumbersome entire maintenance process, invisibly increasing the labor costs and time investment of substation operation and maintenance personnel and maintenance personnel, and also requiring on-site maintenance and upkeep for each handcart, with relatively low maintenance efficiency.

[0003] After retrieval, the circuit breaker handcarts in the prior art all have fixed sizes and are matched with fixed cabinets. Represented by an intelligent circuit breaker handcart disclosed in patent document CN110223880B and a circuit breaker breaking auxiliary device for a 10kV switch cabinet type disclosed in CN112349523A, they can only correspond to cabinets of specific styles during use, lacking universality and even more lacking standardization, and cannot solve the problems faced by the present invention as described above.

[0004] Now a general-purpose grounding trolley circuit breaker for medium-mounted cabinets is provided to solve the above problems. Summary of the Invention

[0005] In view of the above situation, to overcome the deficiencies of the prior art, the present invention provides a general-purpose grounding trolley circuit breaker for medium-mounted cabinets, effectively solving the problems that the circuit breakers of existing grounding handcarts lack unity and standardization, resulting in a rather cumbersome entire maintenance process, large labor costs and time investment, and relatively low maintenance efficiency.

[0006] The technical solution it adopts is that it includes a circuit breaker of a grounding handcart, and the circuit breaker includes a telescopic door, a locking shutter control module, and a bracket for installing a moving contact.

[0007] There is a grounding copper bar on the right side of the bracket, and the grounding copper bars are fixed together by a plurality of insulating lightning arresters; a moving contact lifting module and a moving contact phase spacing control module are installed on the bracket.

[0008] The moving contact lifting module described above includes a plurality of lead screw-nut mechanisms arranged vertically, where the nuts are fixed on the bracket and the lead screws are rotatably installed on the retractable door; when the plurality of lead screws rotate simultaneously, the plurality of nuts can drive the bracket to move up and down;

[0009] The moving contact phase spacing control module described above includes three moving contacts a, b, and c on the same horizontal line. There are three worm and worm gear mechanisms on the bracket corresponding to the moving contacts one by one. The three worms are coaxial and rotatably installed on the bracket; among them, the thread helix directions of the worms corresponding to a and c are opposite. Disks are fixed on both of these two worms. The disks are made of insulating materials. The left ends of the a and c moving contacts are eccentrically fixed on the disks, and electric cores are inserted into the disks; a cam is fixed on the worm corresponding to the b phase. There is a slider that can move up and down on the upper side of the cam. The slider is made of insulating material and there is an electric core in the slider; the electric core and the grounding wire are connected by a flexible copper busbar; when the three worms drive their respective worms to rotate simultaneously, the phase spacing of the three moving contacts changes, and the three moving contacts remain on the same horizontal plane.

[0010] Preferably, the grounding copper busbar and the grounding wire of the circuit breaker are connected by a flexible copper busbar.

[0011] Preferably, the retractable door includes a hollow fixed plate. There is an active plate at both the front and rear ends of the cavity of the fixed plate. Guide rods arranged in the front-rear direction are fixed in the cavity of the fixed plate. The active plates can slide back and forth along the guide rods. Compression springs are sleeved on the guide rods, and the compression springs can push the two active plates away from each other; positioning pins are provided on the fixed plate, and a plurality of positioning holes are provided on the active plates. The cooperation between the positioning pins and the positioning holes can fix the active plates.

[0012] Preferably, the locking shutter control module is composed of two U-shaped plates, and the two U-shaped plates are fixed together at a right angle; one side of the locking shutter control module is hinged on the front and rear side plates of the circuit breaker.

[0013] Preferably, a long strip box corresponding to the lead screw is fixed on the inner side of the fixed plate. The lead screw is located in the long strip box, and the lead screw is installed on the fixed plate through the long strip box; a driven wheel is fixed at the lower end of each lead screw. There is a rotating shaft arranged in the front-rear direction on the inner side of the fixed plate. The rotating shaft is rotatably installed on the fixed plate. There are driving wheels corresponding to the driven wheels on the rotating shaft. When the rotating shaft drives the corresponding driven wheels through the two driving wheels simultaneously, the two lead screws rotate simultaneously, thereby realizing the lifting of the bracket.

[0014] Preferably, a vertical rod is fixed at the upper end of the slider. The upper end of the vertical rod penetrates through the upper side plate of the bracket. There is a compression spring between the slider and the upper side plate of the bracket; when the cam rotates, the cam can drive the slider to move up and down, realizing the up and down movement of the b-phase moving contact.

[0015] Preferably, the electric core adopts an embedded installation structure. Concave pits corresponding to the electric cores on the disk are provided on the disk, and the electric cores are embedded in the disks.

[0016] Preferably, the static contact includes a contact arm and a plum blossom contact at its right end; the contact arm includes a large arm, a small arm and a connecting arm, and the plum blossom contact is installed on the small arm; the large arm and the small arm are connected by the connecting arm, wherein the left end of the connecting arm is connected to the large arm by a spherical hinge, and the right end of the connecting arm is connected to the small arm by a spherical hinge; a plurality of elastic rods are connected between the large arm and the small arm, and the ends of the elastic rods are also connected to the large arm or the small arm in the form of spherical hinges. In this way, the large arm, the small arm and the plurality of elastic rods form a parallelogram mechanism, so that the large arm and the small arm always remain parallel.

[0017] The structure of the present invention is ingenious, one vehicle can be used for multiple purposes, the earthing trolley is standardized, the number of spare parts to be configured is reduced, the maintenance operation process can be optimized, the labor cost and time investment of substation operation and maintenance personnel and maintenance personnel are reduced, and the maintenance and repair costs required for the vehicle are reduced; the maintenance operation efficiency is greatly improved, potential hazards of operating equipment are eliminated in time, which is beneficial to improving the safe operation stability of the power grid. Description of the Drawings

[0018] Figure 1 It is the front view sectional view of the present invention.

[0019] Figure 2 It is the overall structure of the present invention Figure 1 (State of maintaining a cabinet body with a width of 1000 mm).

[0020] Figure 3 It is the left view of the present invention.

[0021] Figure 4 It is the right view of the present invention.

[0022] Figure 5 It is a schematic diagram of the installation relationship between two movable plates and guide rods in the present invention.

[0023] Figure 6 It is the structural diagram of the locking shutter control module in the present invention.

[0024] Figure 7 It is a schematic diagram of the structure of the bracket and the moving contact lifting module and the moving contact phase spacing control module thereon in the present invention.

[0025] Figure 8 It is a schematic diagram of the structure of the moving contact phase spacing control module in the present invention Figure 1 。

[0026] Figure 9 It is a schematic diagram of the structure of the moving contact phase spacing control module in the present invention Figure 2 。

[0027] Figure 10 It is a schematic diagram of the structure of the disc, the battery cell and the contact arm in the present invention.

[0028] Figure 11 Cross-sectional views of the disc, battery cell, and contact arm in the present invention.

[0029] Figure 12 Structural diagram of the battery cell in the present invention.

[0030] Figure 13 Overall structure of the present invention Figure 2 (State of maintaining a cabinet with a width of 800 mm). Specific embodiments

[0031] The following further elaborates on the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0032] It consists of Figures 1 to 13 As shown, the present invention includes a circuit breaker 1 of a grounding trolley, and the circuit breaker 1 includes a telescopic door 2, a locking shutter control module 3, and a bracket 4 for installing a moving contact;

[0033] As Figure 1 , 2 , 7, and 13 show that there is a grounding copper bar 5 on the right side of the bracket 4, and the grounding copper bars 5 are fixed together by a plurality of insulating lightning arresters 6; a moving contact lifting module and a moving contact phase spacing control module are installed on the bracket 4;

[0034] As Figure 1 , 2 , 7, and 13 show that the moving contact lifting module includes a plurality of lead screw 7 - nut 8 mechanisms arranged vertically, wherein the nut 8 is fixed on the bracket 4, and the lead screw 7 is rotatably installed on the telescopic door 2; when a plurality of lead screws 7 rotate simultaneously, a plurality of nuts 8 can drive the bracket 4 to move up and down;

[0035] As Figure 7 , 8 , 9 show that the moving contact phase spacing control module includes three moving contacts a, b, and c on the same horizontal line, and there are three worm gear 9 - worm 10 mechanisms on the bracket 4 corresponding to the moving contacts one by one. The three worms 10 are coaxially arranged and rotatably installed on the bracket 4; among them, the thread helix directions of the worms 10 corresponding to a and c are opposite, and discs 11 are fixed on both of these two worm gears 9. The discs 11 are made of insulating materials, and the left ends of the a and c moving contacts are eccentrically fixed on the discs 11. Battery cells 12 are inserted into the discs 11; a cam 13 is fixed on the worm gear 9 corresponding to the b phase, and there is a slider 14 that can move up and down on the upper side of the cam 13. The slider 14 is made of insulating material, and a battery cell 12 is inside the slider 14; the battery cell 12 is connected to the grounding wire by a flexible copper bar connection 15; when the three worms 10 drive their respective worm gears 9 to rotate simultaneously, the phase spacing of the three moving contacts changes, and the three moving contacts remain on the same horizontal plane.

[0036] As Figure 2 , 13As shown, in order to energize the grounding copper bar 5 and the grounding wire of the circuit breaker 1 simultaneously without affecting the up-and-down movement of the grounding copper bar 5 following the bracket 4, a flexible copper bar connection 15 is used between the grounding copper bar 5 and the grounding wire of the circuit breaker 1.

[0037] As Figure 5 shown, in order to adapt to cabinets with different width dimensions, the retractable door 2 includes a hollow fixed plate 16. There is an active plate 17 at both the front and rear ends inside the cavity of the fixed plate 16. A guide rod 18 arranged in the front-rear direction is fixed inside the cavity of the fixed plate 16. The active plate 17 can slide back and forth along the guide rod 18. A compression spring is sleeved on the guide rod 18, and the compression spring can push the two active plates 17 towards the side away from each other; a positioning pin 19 is provided on the fixed plate 16, and a plurality of positioning holes 20 are provided on the active plate 17. The cooperation between the positioning pin 19 and the positioning holes 20 can fix the active plate 17.

[0038] As Figure 2 、 6 、13 shown, in order to touch the locking shutter in different cabinets while matching different cabinets, the locking shutter control module 3 is composed of two U-shaped plates 21, and the two U-shaped plates 21 are fixed together at a right angle; one side of the locking shutter control module 3 is hinged on the front and rear side plates of the circuit breaker 1.

[0039] As Figure 2 、 7 shown, in order to install the lead screw 7, a long strip box 22 corresponding to the lead screw 7 is fixed inside the fixed plate 16. The lead screw 7 is located inside the long strip box 22, and the lead screw 7 is installed on the fixed plate 16 through the long strip box 22; a driven wheel 23 is fixed at the lower end of each lead screw 7. A rotating shaft 24 arranged in the front-rear direction is provided inside the fixed plate 16, and the rotating shaft 24 is rotatably installed on the fixed plate 16. A driving wheel 25 corresponding to the driven wheel 23 is provided on the rotating shaft 24. When the rotating shaft 24 drives the driven wheels 23 corresponding to it through the two driving wheels 25 at the same time, the two lead screws 7 rotate simultaneously, thereby realizing the lifting of the bracket 4.

[0040] As Figure 2 、 7 shown, in order to realize the up-and-down movement of the slider 14, a vertical rod 26 is fixed at the upper end of the slider 14. The upper end of the vertical rod 26 penetrates through the upper side plate of the bracket 4, and there is a compression spring between the slider 14 and the upper side plate of the bracket 4; when the cam 13 rotates, the cam 13 can drive the slider 14 to move up and down, realizing the up-and-down movement of the b-phase moving contact.

[0041] In order to prevent electric leakage, the battery cell 12 adopts an embedded installation structure. A concave pit corresponding to the battery cell 12 is provided on the disc 11, and the battery cell 12 is embedded in the disc 11.

[0042] As Figure 1 、 2, as shown in Figures 7, 8, 9, 10, 11, and 13, in order to keep the moving and static contacts in good contact, the moving contact includes a contact arm and a plum blossom contact 27 at its right end; the contact arm includes a large arm 28, a small arm 29, and a connecting arm 30, and the plum blossom contact 27 is installed on the small arm 29; the large arm 28 and the small arm 29 are connected by the connecting arm 30, wherein the left end of the connecting arm 30 is connected to the large arm 28 by a spherical hinge, and the right end of the connecting arm 30 is connected to the small arm 29 by a spherical hinge; a plurality of elastic rods 31 are connected between the large arm 28 and the small arm 29, and the ends of the elastic rods 31 are also connected to the large arm 28 or the small arm 29 in the form of spherical hinges. In this way, the large arm 28, the small arm 29, and the plurality of elastic rods 31 form a parallelogram mechanism, so that the large arm 28 and the small arm 29 always remain parallel.

[0043] As Figure 11 shown, the elastic rod 31 refers to a rod-shaped object with a certain deformation ability and the ability to return to its original state, such as an insulating rubber rod, an insulating spring telescopic rod, etc., but it is necessary to ensure the tight connection between the large arm 28, the small arm 29, and the connecting rod to ensure reliable electrical conductivity. If necessary, conductive paste or alum can be applied as an auxiliary.

[0044] It should be noted that the rotating shaft 24, the worm 10, etc. in the above embodiments are all rotated manually. In the current era of popularization of intelligence, those of ordinary skill in the art can achieve the above-mentioned automated operations through programming or a logic controller, but this is not the core of the present invention and will not be elaborated again.

[0045] Similarly, if programming or logic control, auxiliary sensors, etc. are used between the various modules in the present invention, the user experience can be greatly improved. For example, when repairing a cabinet with a width of 1000 mm, the movable plate 17 needs to extend from both sides of the fixed plate 16, and the movable shutter trigger module should flip 90° to the side away from the side wall of the isolator, as Figure 2 shown. When repairing a cabinet with a width of 800 mm, at this time, the movable plate 17 needs to be retracted into the cavity of the fixed plate 16, and the locking shutter control module 3 should be retracted upward, as Figure 13 shown. According to this logic, sensors or electric push rods can be respectively arranged on the movable plate 17 and the locking shutter control module 3 to realize their linkage.

[0046] The two movable plates 17 in the present invention can adopt a variety of control methods. The method of using the guide rod 18, the spring, and the positioning pin 19 is adopted above. The reason for adopting this method is that the sizes of the vast majority of kyn28 medium-mounted cabinets in the existing market are only two models of 800 mm and 1000 mm. Using the above simple positioning pin 19 combination obviously has a cost advantage. In addition, the form of controlling the electric push rod by a logic circuit can also be adopted.

[0047] The distance between the ABC three-phase moving contacts of the present invention is controlled by a moving contact phase spacing control module. The helix directions of the threads on the worms 10 corresponding to the a and c phases are opposite. Thus, when the worms 10 rotate simultaneously, the rotation directions of the worm wheels 9 on the a and c phases are opposite, and the adjustment of the distance between adjacent moving contacts is also achieved. For the sake of convenience of explanation, on this basis, it is assumed that when the distance between the a and c phases is the farthest, it is the starting point. At this time, the slider 14 where the b-phase moving contact is located is at the farthest point of the cam 13. At the same time, it is assumed that when the distance between the a and c phases is the closest, it is the end point. At this time, the slider 14 where the b-phase moving contact is located is at the closest point of the cam 13. It is assumed that the lead pitches of the threads on the three worms 10 are the same, and the diameters of the worm wheels 9 corresponding to the a and c phase moving contacts are twice the diameters of the worm wheels 9 corresponding to the b phase. Thus, when the worm wheels 9 corresponding to the a and c phase moving contacts rotate 180°, the worm wheel 9 corresponding to the b phase moving contact rotates one full circle.

[0048] During use, when it is necessary to adjust the interval between the moving contacts, the three worms 10 are rotated to make the three worm wheels 9 rotate simultaneously. The two discs 11 drive the a and c phase moving contacts to rotate downward, and the interval between the a, b, and c phase moving contacts gradually shrinks, realizing the adjustment of the interval between the moving contacts. If it is necessary to adjust the height of the moving contacts, the rotating shaft 24 can be screwed. The two driving wheels 25 on the rotating shaft 24 drive the two lead screws 7 to rotate simultaneously, realizing the up and down movement of the entire bracket 4 and the lifting of the moving contacts. When it is necessary to repair different cabinets, the extension amount of the movable plate 17 can be adjusted to adapt to cabinets of different widths. At the same time, by adjusting the retraction and lowering of the locking shutter control module 3, the opening and closing of the locking shutters in different cabinets can be triggered, enabling the normal insertion between the static and moving contacts. In the present invention, the traditional single triggering element (similar in shape to the U-shaped plate 21 in the present invention) is replaced with two fixed in a right-angle form. Raised portions are provided on both sides of the U-shaped plate 21, which is similar to the traditional method to ensure the opening and closing of the locking shutter can be triggered.

[0049] Since the present invention is adapted to the static contacts with different spacings in different cabinets, compared with the width of the cabinet, there are relatively standard production models. The distances between the static contacts in different cabinets do not have clear or obvious models. Considering factors such as large tolerances in production itself and deformations generated during later use, the moving contacts need to be able to adaptively adjust within a small range. For this reason, the present invention disassembles the traditional contact arm into three parts: a large arm 28, a connecting arm 30, and a small arm 29. Among them, the connecting arm 30 exists as a conductive part. A plurality of elastic rods 31 between the large arm 28 and the small arm 29 form a parallelogram mechanism, which can also ensure the movement of the small arm 29 within a certain range and make the insertion structure between the static and moving contacts more reliable.

[0050] Finally, but still importantly, which the inventor also needs to emphasize, the present invention uses a worm and worm gear mechanism and a cam mechanism to achieve the horizontal and vertical movement of the moving contacts of the three phases a, b, and c, and at the same time ensures that the three moving contacts are always on the same horizontal line, belonging to a mechanically reliable linkage. According to the conventional mechanical design concept, actually using horizontal and vertical electric cylinders to drive the moving contacts to move seems to be simpler and more indirect, and is also easier to achieve. However, there are specific reasons why switchgear operators are in a high-risk industry. Although it seems simple to use electric cylinders to drive the moving contacts to move, the failure rate is also high and it is not reliable. It is necessary to use electrical signals or laser signals to check the up and down, left and right positions of the moving contacts, and at the same time, feedback must be carried out at all times. This itself increases the difficulty of operation and implementation. Considering safety and convenience, this simple and crude method is premised on sacrificing the safety guarantee of the operator and is very likely to cause major accidents. This concept is also reflected in other mechanisms on the circuit breaker trolley, including but not limited to the closing mechanism, energy storage mechanism, opening electric control mechanism, etc., all of which adopt more reliable mechanical linkages, and the electric control only provides kinetic energy for the above-mentioned mechanisms. In short, everything serves safety.

Claims

1. A universal grounding trolley circuit breaker for a central cabinet, characterized in that: A circuit breaker (1) comprising a grounding trolley, the circuit breaker (1) comprising a telescopic door (2), a locking shutter control module (3), and a bracket (4) for mounting a moving contact; A grounding copper bar (5) is provided on the right side of the bracket (4), and the grounding copper bar (5) is fixed together via a plurality of insulating lightning arresters (6); a moving contact lifting module and a moving contact phase spacing control module are installed on the bracket (4); The movable contact lifting module comprises a plurality of vertically arranged lead screw (7) and nut (8) mechanisms, wherein the nut (8) is fixed on the bracket (4), and the lead screw (7) is rotatably mounted on the telescopic door (2); when the plurality of lead screws (7) rotate simultaneously, the plurality of nuts (8) can drive the bracket (4) to move up and down; The moving contact phase spacing control module comprises three moving contacts a, b and c located on the same horizontal line, and a bracket (4) is provided with three worm gear (9) and worm (10) mechanisms corresponding to the moving contacts one by one, and the three worm gears (10) are coaxially and rotatably mounted on the bracket (4); wherein the threads on the worm gears (10) corresponding to a and c have opposite rotation directions, and a disk (11) is fixed on both worm gears (9), and the disk (11) is made of insulating material, and the left ends of the moving contacts a and c are eccentrically fixed on the disk (11). , a battery cell (12) is inserted in the disc (11); a cam (13) is fixed on the worm wheel (9) corresponding to the b phase, a slider (14) that can move up and down is provided on the upper side of the cam (13), the slider (14) is made of insulating material, and the battery cell (12) is contained in the slider (14); the battery cell (12) and the grounding wire are connected by a copper busbar (15); when the three worms (10) drive their respective worm wheels (9) to rotate at the same time, the phase spacing of the three moving contacts changes, and the three moving contacts are kept on the same horizontal plane; The locking shutter control module (3) is composed of two U-shaped plates (21), and the two U-shaped plates (21) are fixed together at a right angle; one side of the locking shutter control module (3) is hinged to the front and rear side plates of the circuit breaker (1); The movable contact comprises a contact arm and a plum blossom contact (27) at its right end; the contact arm comprises a large arm (28), a small arm (29) and a connecting arm (30), wherein the plum blossom contact (27) is mounted on the small arm (29); the large arm (28) and the small arm (29) are connected via the connecting arm (30), wherein the left end of the connecting arm (30) and the large arm (28) are connected by a ball joint, and the right end of the connecting arm (30) and the small arm (29) are connected by a ball joint; a plurality of elastic rods (31) are connected between the large arm (28) and the small arm (29), and the ends of the elastic rods (31) are also connected to the large arm (28) or the small arm (29) by a ball joint, so that the large arm (28), the small arm (29) and the plurality of elastic rods (31) form a parallelogram mechanism, so that the large arm (28) and the small arm (29) always remain parallel.

2. A universal grounding trolley circuit breaker for a central cabinet according to claim 1, characterized in that: The grounding copper bar (5) and the grounding wire of the circuit breaker (1) are connected by a copper bar soft connection (15).

3. A universal grounding trolley circuit breaker for a central cabinet according to claim 1, characterized in that: The telescopic door (2) comprises a hollow fixed plate (16), wherein a movable plate (17) is provided at both the front and rear ends of the cavity of the fixed plate (16), a guide rod (18) arranged in the front-rear direction is fixed in the cavity of the fixed plate (16), the movable plate (17) can slide forward and backward along the guide rod (18), and a compression spring is sleeved on the guide rod (18), and the compression spring can push the two movable plates (17) to a side away from each other; a positioning pin (19) is provided on the fixed plate (16), and a plurality of positioning holes (20) are provided on the movable plate (17), and the positioning pin (19) cooperates with the positioning holes (20) to fix the movable plate (17).

4. A universal grounding trolley circuit breaker for a central cabinet according to claim 3, characterized in that: A strip box (22) corresponding to the lead screw (7) is fixed on the inner side of the fixed plate (16), the lead screw (7) is in the strip box (22), and the lead screw (7) is mounted on the fixed plate (16) via the strip box (22); a driven wheel (23) is fixed to the lower end of each lead screw (7), a rotating shaft (24) arranged along the front-rear direction is provided on the inner side of the fixed plate (16), the rotating shaft (24) is rotatably mounted on the fixed plate (16), and a driving wheel (25) corresponding to the driven wheel (23) is provided on the rotating shaft (24); when the rotating shaft (24) drives the corresponding driven wheel (23) simultaneously via the two driving wheels (25), the two lead screws (7) are rotated simultaneously, thereby realizing the lifting and lowering of the bracket (4).

5. The universal grounding trolley circuit breaker for a central cabinet according to claim 1 is characterized in that: A vertical rod (26) is fixed to the upper end of the slider (14), the upper end of the vertical rod (26) passes through the upper side plate of the bracket (4), and a compression spring is provided between the slider (14) and the upper side plate of the bracket (4); when the cam (13) rotates, the cam (13) can drive the slider (14) to move up and down, thereby realizing the up and down movement of the b-phase moving contact.

6. A universal grounding trolley circuit breaker for a central cabinet according to any one of claims 2 to 5, characterized in that: The battery cell (12) adopts an embedded installation structure; a recess corresponding to the battery cell (12) thereon is provided on the disc (11); and the battery cell (12) is embedded in the disc (11).

Images