A switch cabinet electric trolley

Abstract

The present invention relates to the technical field of switch cabinets, and discloses an electric trolley for switch cabinets, comprising a frame, wherein a first mounting plate is fixedly connected to the top of the frame, a first slide is provided on one side of the first mounting plate, a first slider is slidably connected in the first slide, a mounting frame is fixedly connected to one side of the first slider, a first threaded rod is rotatably inserted into the top of the first mounting plate, the first threaded rod is threadedly inserted into the first slider, a plurality of insulators are fixedly connected to one side of the mounting frame, an insulating cover is fixedly connected to the other end of the insulator, a guide post is inserted into the insulator, the guide post passes through the insulating cover, a contact arm is fixedly connected to the other end of the insulating cover, the contact arm is electrically connected to the guide post, and a plum blossom contact is fixedly connected to the other end of the contact arm. The present invention can adjust the height of the plum blossom contact, thereby facilitating connection with busbar contacts of different heights, thereby accurately completing docking with the busbar contact.

Description

Technical Field

[0001] The present invention relates to the technical field of switch cabinets, in particular to an electric trolley for a switch cabinet. Background Art

[0002] A trolley is a small, push-type, pull-out part of a switchgear cabinet, on which the main electrical components are mounted. There are two types of trolleys: PT trolleys and switch (circuit breaker) trolleys. When the switch is disconnected, it can be manually pulled out of the switchgear cabinet after laying guide rails for maintenance or replacement. Currently, most PT trolleys use a horizontal push-type structure, but how to accurately connect and disconnect the contact device has become a key issue.

[0003] At present, most of the existing switch cabinet electric trolleys have the following shortcomings: during use, the conductive contact arms are mostly fixedly connected, with consistent heights and cannot be adjusted, and cannot accurately complete the docking with the busbar contacts, resulting in a relatively complex overall structure and cumbersome operation, and cannot conveniently and quickly realize the connection and disconnection of the contact device. In summary, most of the existing switch cabinet electric trolleys cannot meet actual needs well. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides an electric trolley for a switch cabinet, which is mainly used to solve the problem that during use, the conductive contact arms are mostly fixedly connected, have consistent heights, cannot be adjusted, and cannot accurately complete the docking with the busbar contacts, resulting in a relatively complex overall structure, cumbersome operation, and inability to conveniently and quickly realize the connection and disconnection of the contact device.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The top of the mounting plate is fixedly connected to the first mounting plate, and one side of the first mounting plate is provided with a first slide groove, and the first slide is slidably connected to the first slide groove, and one side of the first slide is fixedly connected to the mounting bracket, and the top of the first mounting plate is rotatably inserted into the first threaded rod, and the first threaded rod is threadably inserted into the first slide. One side of the mounting bracket is fixedly connected to a plurality of insulators, and the other end of the insulator is fixedly connected to an insulating cover, and a guide post is inserted in the insulator, and the guide post passes through the insulating cover, and the other end of the insulating cover is fixedly connected to a contact arm, and the contact arm is electrically connected to the guide post, and the other end of the contact arm is fixedly connected to a plum blossom contact. A spring is inserted on one side of the guide post, and both ends of the spring are fixedly connected to contact pieces, and the top of the frame is fixedly connected to a second mounting plate, and one side of the second mounting plate is fixedly connected to a plurality of voltage transformers, and the other end of the voltage transformer is fixedly connected to a fuse, and a limiting hole is provided on one side of the fuse, and the guide post passes through the limiting hole, and the contact piece contacts the inner wall of the limiting hole.

[0007] Furthermore, a plurality of second sliding grooves are provided on one side of the first mounting plate, a second sliding block is slidably connected in the second sliding groove, and one side of the second sliding block is fixedly connected to the mounting frame.

[0008] On the basis of the above solution, a ball is provided on one side of the second sliding block, and the ball rolls in the second sliding groove.

[0009] As a further solution of the present invention, the top end of the first threaded rod is fixedly connected to an adjusting knob.

[0010] Furthermore, a side plate is fixedly connected to the top of the frame, a mechanism box is fixedly connected between the side plate and the first mounting plate, and a harmonic eliminater is fixedly connected to one side of the first mounting plate.

[0011] On the basis of the above-mentioned solution, an observation window is provided on one side of the side panel, and a pulling handle is fixedly connected to one side of the side panel.

[0012] As a further solution of the present invention, a plurality of reinforcing ribs are fixedly connected to one side of the mounting frame.

[0013] Furthermore, an insulating plate is fixedly connected to the bottom of the frame, and a plurality of rollers are fixedly connected to the bottom of the insulating plate.

[0014] On the basis of the above solution, a stepper motor is fixedly connected to one side of the side plate, an output end of the stepper motor is key-connected to a second threaded rod, and the second threaded rod passes through the vehicle frame.

[0015] As a further solution of the present invention, the contact arm includes an automatic circuit-breaking mechanism; one end of the automatic circuit-breaking mechanism is electrically connected to the guide column, and the other end is electrically connected to the plum blossom contact; the automatic circuit-breaking mechanism includes an insulating outer cylinder, a first fixed sleeve sleeved on one end of the outer cylinder, a second fixed sleeve sleeved on the other end of the outer cylinder, a first conductive rod arranged in the outer cylinder and threadedly engaged on the first fixed sleeve, and a second conductive rod arranged in the outer cylinder and threadedly engaged with the second fixed sleeve; the first conductive rod and the second conductive rod have opposite threaded engagement directions with the first fixed sleeve and the second fixed sleeve; the ends of the first conductive rod and the second conductive rod are opposite; two third conductive rods that are in sliding electrical contact with the first conductive rod and the second conductive rod respectively extend from both ends of the outer cylinder and are in contact with the second conductive rod. The guide column and the plum blossom contact are electrically connected; an insulating inner cylinder is provided on the outer sliding sleeve of the first conductive rod and the second conductive rod; the inner cylinder is filled with electrorheological fluid; a plurality of linkage plates are provided on the outer circumference of the upper ends of the first conductive rod and the second conductive rod; a plurality of electrode drive plates are provided on the inner wall of the inner cylinder; the electrode drive plates are grounded through a switchable circuit; the first conductive rod and the second conductive rod are sealed and slid into the inner cylinder; an outer rack is provided on the outer ring of the inner cylinder in the axial direction, and a spur gear is engaged with the outer rack; a servo motor drives the inner cylinder to rotate through the spur gear; a controller controls the operation of the servo motor according to abnormal information monitored by a sensor arranged in the switch cabinet to detect circuit abnormalities or operation abnormalities.

[0016] The emergency circuit breaking method of the automatic circuit breaking mechanism is:

[0017] ① When the sensor detecting circuit abnormality or abnormal operation in the switch cabinet detects abnormal information and the controller determines that the circuit needs to be disconnected urgently, the controller controls the ground connection of the electrode drive plate, and an electric field is formed between the conductive rod and the electrode drive plate. The electrorheological fluid is converted into a solid state under the action of the electric field;

[0018] ② The controller controls the servo motor to drive the spur gear to rotate, and the spur gear drives the inner cylinder to rotate via the external rack. The inner cylinder drives the first conductive rod and the second conductive rod to rotate via the electrode drive plate, solid-state electrorheological fluid, and linkage plate. Because the first conductive rod and the second conductive rod are respectively threaded with the first fixed sleeve and the second fixed sleeve and rotate in opposite directions, the rotation of the first conductive rod and the second conductive rod causes them to move away from each other under the action of the threads, and the first conductive rod and the second conductive rod are no longer in contact.

[0019] ③ When the two conductive rods move away from each other beyond a certain distance, the grounding line of the electrode driving plate is disconnected, the electrorheological fluid loses the electric field effect and turns into liquid, immersing the gap between the two conductive rods and thus extinguishing the arc.

[0020] Compared with the prior art, the present invention provides a switch cabinet electric trolley with the following beneficial effects:

[0021] 1. The present invention rotates the first threaded rod, thereby causing the first slider to slide in the first sliding groove, thereby driving the mounting frame to move, thereby driving the contact arm and the plum blossom contact to move together, thereby adjusting the height of the plum blossom contact, thereby facilitating connection with busbar contacts of different heights, thereby accurately completing docking with the busbar contacts.

[0022] 2. The present invention ensures that the contact piece is always in contact with the inner wall of the limit hole of the fuse under the elastic action of the spring, thereby ensuring the connection between the guide column and the fuse, so that the disconnection operation can be performed in the event of a fault, thereby improving the safety of the switch cabinet.

[0023] 3. The present invention can guide the movement of the mounting frame by setting the second slider to slide in the second slide groove, thereby improving the stability of the movement of the mounting frame and further improving the stability of the height adjustment of the plum blossom contact.

[0024] 4. The present invention connects the second threaded rod to the threaded hole of the switch cabinet, and then the second threaded rod rotates under the drive of the stepping motor, thereby driving the frame to move forward, so that the plum blossom contact and the busbar contact are connected, thereby realizing electric connection, which is convenient and fast.

[0025] 5. The present invention can automatically realize rapid circuit breaking when the controller determines that the switch cabinet is operating abnormally or abnormally based on sensor data, thereby ensuring the safety of the switch cabinet and operators. By utilizing the solid-liquid transformation characteristics of the electrorheological fluid, the dual functions of transmission medium and auxiliary arc extinguishing are realized at the same time, which not only simplifies the transmission mechanism, but also has good arc extinguishing effect, low manufacturing cost, not prone to failure and damage, and long service life; the electrorheological fluid is transformed into a solid state under the action of the electric field, and is used as a transmission medium to drive the lower conductive rod to rotate, and then the structure of the reverse threads of the two conductive rods is utilized to separate the two conductive rods from each other. After the two conductive rods are disconnected, the electrorheological fluid can be transformed into a liquid state again, and the gap between the two conductive rods is immersed in the electrorheological fluid, thereby realizing liquid arc extinguishing. Compared with vacuum arc extinguishing, the arc extinguishing effect is stronger, and it can also absorb heat to cause the two conductive rods to cool down, reduce their aging caused by the electric arc, and reduce the phenomenon of metal evaporation of the two conductive rods at high temperature caused by the arc, thereby making them have a longer service life. Compared with vacuum circuit breakers, the manufacturing cost and processing cost of the device are significantly reduced, and there is no need to worry about damage and leakage of vacuum circuit breakers. It can adapt to harsh environments. After breaking the circuit in this way, it is equivalent to achieving oil sealing through insulating oil, which can avoid the adverse effects of humid air and other conditions, improve safety and avoid breakdown due to humidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the three-dimensional structure of a switch cabinet electric trolley embodiment 1 proposed by the present invention;

[0027] Figure 2 This is a bottom view structural diagram of a switch cabinet electric trolley embodiment 1 proposed by the present invention;

[0028] Figure 3 This is a schematic diagram of the three-dimensional structure of the first part of Example 1 of an electric trolley for switch cabinets proposed by the present invention;

[0029] Figure 4 This is a schematic diagram of the third part of the three-dimensional structure of the first embodiment of the electric trolley for switch cabinets proposed by the present invention;

[0030] Figure 5 This is a partial cross-sectional structural diagram of a switch cabinet electric trolley embodiment 1 proposed by the present invention;

[0031] Figure 6 This is a side structural schematic diagram of a switch cabinet electric trolley embodiment 2 proposed by the present invention;

[0032] Figure 7 Schematic diagram of the automatic circuit breaker mechanism of the present invention in the connected state;

[0033] Figure 8 This is a schematic diagram of the automatic circuit breaker mechanism of the present invention in the disconnected state.

[0034] In the figure: 1. Frame; 2. Side panel; 3. First mounting plate; 4. First slide; 5. Second slide; 6. First slider; 7. Mounting bracket; 8. Second slider; 9. Ball bearing; 10. First threaded rod; 11. Adjustment knob; 12. Insulator; 13. Insulation cover; 14. Guide post; 15. Contact arm; 16. Plum blossom contact; 17. Spring; 18. Contact piece; 19. Limiting hole; 20. Fuse; 21. Second mounting plate; 22. Voltage transformer; 23. Discharge Tuner; 24. Mechanism box; 25. Observation window; 26. Lifting handle; 27. Reinforcement rib; 28. Insulation plate; 29. ​​Roller; 30. Second threaded rod; 31. Stepper motor; 32. Outer cylinder; 33. First fixing sleeve; 34. Second fixing sleeve; 35. First conductive rod; 36. Second conductive rod; 37. Inner cylinder; 38. Electrorheological fluid; 39. Electrode drive plate; 40. Linkage plate; 41. Spur gear; 42. Servo motor; 43. Third conductive rod. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] Example 1

[0037] Reference Figure 1-Figure 5 , a switch cabinet electric trolley, including a frame 1, a first mounting plate 3 is fixed to the top of the frame 1 by bolts, a first slide groove 4 is provided on one side of the first mounting plate 3, a first slider 6 is slidably connected in the first slide groove 4, a mounting bracket 7 is fixed to one side of the first slider 6 by bolts, a first threaded rod 10 is rotatably inserted into the top of the first mounting plate 3, the first threaded rod 10 is threadedly inserted into the first slider 6, a plurality of insulators 12 are fixed to one side of the mounting bracket 7 by bolts, an insulating cover 13 is fixed to the other end of the insulator 12 by bolts, a guide column 14 is inserted into the insulator 12, the guide column 14 passes through the insulating cover 13, a contact arm 15 is fixed to the other end of the insulating cover 13 by bolts, the contact arm 15 is electrically connected to the guide column 14, and a plum blossom contact 16 is fixed to the other end of the contact arm 15 by bolts, the first threaded rod 10 rotates, so that the first slider 6 is in the The guide post 14 slides in the slide groove 4, thereby driving the mounting bracket 7 to move, thereby driving the contact arm 15 and the plum blossom contact 16 to move together, thereby adjusting the height of the plum blossom contact 16, which is convenient for connecting with bus contacts of different heights. A spring 17 is inserted on one side of the guide post 14, and contact pieces 18 are fixed to both ends of the spring 17 by bolts. A second mounting plate 21 is fixed to the top of the frame 1 by bolts, and a plurality of voltage transformers 22 are fixed to one side of the second mounting plate 21 by bolts. The other end of the voltage transformer 22 is fixed to a fuse 20 by bolts. A limiting hole 19 is provided on one side of the fuse 20, and the guide post 14 passes through the limiting hole 19, and the contact piece 18 contacts the inner wall of the limiting hole 19. Under the elastic action of the spring 17, the contact piece 18 is always in contact with the inner wall of the limiting hole 19 of the fuse 20, thereby ensuring that the guide post 14 is connected to the fuse 20.

[0038] A plurality of second slide grooves 5 are provided on one side of the first mounting plate 3. A second slider 8 is slidably connected in the second slide groove 5. One side of the second slider 8 is fixedly connected to the mounting frame 7. The setting of the second slider 8 sliding in the second slide groove 5 can guide the movement of the mounting frame 7, thereby improving the stability of the movement of the mounting frame 7, and then improving the stability of the height adjustment of the plum blossom contact 16. A ball 9 is provided on one side of the second slider 8. The ball 9 rolls in the second slide groove 5, so that the second slider 8 slides more smoothly. The top of the first threaded rod 10 is fixed with an adjusting knob 11 by a bolt, so as to facilitate the rotation of the first threaded rod 10. The top of the frame 1 is fixed with a side panel 2 by bolts, and a mechanism box 24 is fixed between the side panel 2 and the first mounting plate 3 by bolts. A harmonic elimination device 23 is fixed to one side of the first mounting plate 3 by bolts. An observation window 25 is provided on one side of the side panel 2, and a lifting handle 26 is fixed to one side of the side panel 2 by bolts to facilitate pushing the frame 1. A plurality of reinforcing ribs 27 are welded to one side of the mounting frame 7 to strengthen the firmness of the mounting frame 7. An insulating plate 28 is fixed to the bottom of the frame 1 by bolts, and a plurality of rollers 29 are fixed to the bottom of the insulating plate 28 by bolts to prevent leakage accidents in the switch cabinet.

[0039] The working principle of this embodiment: when in use, first, rotate the adjusting knob 11 to drive the first threaded rod 10 to rotate, so that the first slider 6 slides in the first slide groove 4, and then drives the mounting bracket 7 to move, thereby driving the contact arm 15 and the plum blossom contact 16 to move together, thereby adjusting the height of the plum blossom contact 16, and thus facilitating connection with busbar contacts of different heights. During the adjustment process and after the adjustment is completed, under the elastic action of the spring 17, the contact piece 18 is always in contact with the inner wall of the limiting hole 19 of the fuse 20, thereby ensuring that the guide column 14 is connected to the fuse 20, so that a cut-off operation can be performed in the event of a fault. Next, push the roller 29 into the track of the switch cabinet, and then push the lifting handle 26 to make the roller 29 roll, thereby driving the plum blossom contact 16 to move forward, and then making the plum blossom contact 16 dock with the busbar contact.

[0040] Example 2

[0041] Reference Figure 6 A switch cabinet electric trolley includes a stepper motor 31 fixed to one side of a side panel 2 by bolts, and the output end of the stepper motor 31 is keyed to a second threaded rod 30. The second threaded rod 30 passes through the frame 1 and is plugged into the threaded hole of the switch cabinet. Then, the second threaded rod 30 rotates under the drive of the stepper motor 31, thereby driving the frame 1 to move forward, so that the plum blossom contact 16 is connected to the busbar contact.

[0042] The working principle of this embodiment is as follows: when in use, the roller 29 is pushed into the track of the switch cabinet, and the second threaded rod 30 is plugged into the threaded hole of the switch cabinet, so that the second threaded rod 30 rotates under the drive of the stepper motor 31, thereby driving the frame 1 to move forward, so that the plum blossom contact 16 is connected to the busbar contact.

[0043] The electrical components mentioned in this article are all connected to an external main controller and 220V AC power, and the main controller can be a conventional known device that performs control such as a computer.

[0044] Further, refer to Figure 7 and 8 In order to be able to automatically trip the circuit in an emergency when the switch cabinet has an abnormal operation or operation, the contact arm 15 also includes an automatic circuit breaker mechanism; one end of the automatic circuit breaker mechanism is electrically connected to the guide column 14, and the other end is electrically connected to the plum blossom contact 16; the automatic circuit breaker mechanism includes an insulating outer cylinder 32, a first fixed sleeve 33 sleeved on one end of the outer cylinder 32, a second fixed sleeve 34 sleeved on the other end of the outer cylinder 32, a first conductive rod 35 arranged on the first fixed sleeve 33 in the outer cylinder 32 and threadedly engaged, and a second conductive rod 36 arranged in the outer cylinder 32 and threadedly engaged with the second fixed sleeve 34; the first conductive rod 35 and the second conductive rod 36 are threadedly engaged with the first fixed sleeve 33 and the second fixed sleeve 34 in opposite directions; the ends of the first conductive rod 35 and the second conductive rod 36 are opposite to each other; two third conductive rods 43 are in sliding electrical contact with the first conductive rod 35 and the second conductive rod 36 respectively. The first and second conductive rods 35 and 36 are respectively extended from both ends of the outer cylinder 32 and electrically connected to the guide column 14 and the plum blossom contact 16; an insulating inner cylinder 37 is slidingly sleeved on the outside of the first conductive rod 35 and the second conductive rod 36; the inner cylinder 37 is filled with an electrorheological fluid 38; a plurality of linkage plates 40 are provided on the outer circumference of the upper ends of the first conductive rod 35 and the second conductive rod 36 to diverge outward; a plurality of electrode drive plates 39 are provided on the inner wall of the inner cylinder 37; the electrode drive plates 39 are grounded through a switchable circuit; the first conductive rod 35 and the second conductive rod 36 are sealed and slidably penetrated into the inner cylinder 37; an outer rack is provided on the outer ring of the inner cylinder 37 in the axial direction, and a straight gear 41 is engaged with the outer rack; a servo motor 42 drives the inner cylinder 37 to rotate through the spur gear 41; a controller controls the operation of the servo motor 42 according to the abnormal information monitored by the sensor installed in the switch cabinet to detect circuit abnormalities or operation abnormalities.

[0045] The emergency circuit breaker method of the automatic circuit breaker mechanism is:

[0046] ① When the sensor detecting circuit abnormality or abnormal operation in the switch cabinet detects abnormal information and the controller determines that the circuit needs to be disconnected urgently, the controller controls the ground connection of the electrode drive plate 39, and an electric field is formed between the conductive rod and the electrode drive plate 39. The electrorheological fluid 38 is converted into a solid state under the action of the electric field;

[0047] ② The controller controls the servo motor 42 to drive the spur gear 41 to rotate. The spur gear 41 drives the inner cylinder 37 to rotate via the external rack. The inner cylinder 37 drives the first conductive rod 35 and the second conductive rod 36 to rotate via the electrode drive plate 39, the solid electrorheological fluid 38, and the linkage plate 40. Because the first conductive rod 35 and the second conductive rod 36 are respectively threadedly engaged with the first fixed sleeve 33 and the second fixed sleeve 34 and have opposite rotation directions, the rotation of the first conductive rod 35 and the second conductive rod 36 causes them to move away from each other under the action of the threads, and the first conductive rod 35 and the second conductive rod 36 are no longer in contact.

[0048] ③ When the two conductive rods move away from each other by more than a certain distance, the grounding line of the electrode driving plate 39 is disconnected, the electrorheological fluid 38 loses the electric field effect and turns into liquid, immersing the gap between the two conductive rods and thus extinguishing the arc.

[0049] In the description herein, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections, electrical connections, direct connections, or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

Claims

1. A switch cabinet electric trolley, comprising a frame (1), characterized in that: The top of the vehicle frame (1) is fixedly connected to a first mounting plate (3), one side of the first mounting plate (3) is provided with a first slide groove (4), a first slider (6) is slidably connected in the first slide groove (4), one side of the first slider (6) is fixedly connected to a mounting bracket (7), a first threaded rod (10) is rotatably plugged into the top of the first mounting plate (3), the first threaded rod (10) is threadedly plugged into the first slider (6), one side of the mounting bracket (7) is fixedly connected to a plurality of insulators (12), the other end of the insulator (12) is fixedly connected to an insulating cover (13), a guide column (14) is plugged into the insulator (12), the guide column (14) passes through the insulating cover (13), and the other end of the insulating cover (13) is fixedly connected to the mounting bracket (7). A contact arm (15) is fixedly connected, the contact arm (15) is electrically connected to the guide column (14), the other end of the contact arm (15) is fixedly connected to a plum blossom contact (16), one side of the guide column (14) is plugged with a spring (17), both ends of the spring (17) are fixedly connected to contact pieces (18), the top of the frame (1) is fixedly connected to a second mounting plate (21), one side of the second mounting plate (21) is fixedly connected to a plurality of voltage transformers (22), the other end of the voltage transformer (22) is fixedly connected to a fuse (20), one side of the fuse (20) is provided with a limiting hole (19), the guide column (14) passes through the limiting hole (19), and the contact piece (18) contacts the inner wall of the limiting hole (19); The contact arm (15) includes an automatic circuit breaker mechanism; one end of the automatic circuit breaker mechanism is electrically connected to the guide column (14), and the other end is electrically connected to the plum blossom contact (16); the automatic circuit breaker mechanism includes an insulating outer cylinder (32), a first fixed sleeve (33) sleeved on one end of the outer cylinder (32), a second fixed sleeve (34) sleeved on the other end of the outer cylinder (32), a first conductive rod (35) arranged in the outer cylinder (32) and threadedly engaged with the first fixed sleeve (33), and a second conductive rod (36) arranged in the outer cylinder (32) and threadedly engaged with the second fixed sleeve (34); the first conductive rod (35) and the second conductive rod (36) have opposite threaded engagement directions with the first fixed sleeve (33) and the second fixed sleeve (34); the ends of the first conductive rod (35) and the second conductive rod (36) are opposite; two third conductive rods (43) that are in sliding electrical contact with the first conductive rod (35) and the second conductive rod (36) are respectively extended from the two ends of the outer cylinder (32) and are connected to the guide column (14) and the plum blossom contact (16) are electrically connected; the first conductive rod (35) and the second conductive rod (36) are provided with an insulating inner cylinder (37) on the outer sliding sleeve; the inner cylinder (37) is filled with electrorheological fluid (38); the outer circumference of the upper end of the first conductive rod (35) and the second conductive rod (36) is provided with a plurality of linkage pieces (40) diverging outward; the inner wall of the inner cylinder (37) is provided with a plurality of electrode drive pieces (39); the electrode drive pieces (39) are provided with a switchable The circuit is grounded; the first conductive rod (35) and the second conductive rod (36) are sealed and slidably penetrated into the inner cylinder (37); the outer ring of the inner cylinder (37) is provided with an external rack in the axial direction, and a straight gear (41) is engaged with the external rack; a servo motor (42) drives the inner cylinder (37) to rotate through the spur gear (41); a controller controls the operation of the servo motor (42) according to abnormal information monitored by a sensor arranged in the switch cabinet for detecting circuit abnormality or operation abnormality; The emergency circuit breaking method of the automatic circuit breaking mechanism is: ① When the sensor for detecting circuit abnormality or abnormal operation in the switch cabinet detects abnormal information and the controller determines that the circuit needs to be disconnected urgently, the controller controls the grounding connection of the electrode driving plate (39), an electric field is formed between the conductive rod and the electrode driving plate (39), and the electrorheological fluid (38) is converted into a solid state under the action of the electric field; ② The controller controls the servo motor (42) to drive the spur gear (41) to rotate, and the spur gear (41) drives the inner cylinder (37) to rotate through the outer rack; the inner cylinder (37) drives the first conductive rod (35) and the second conductive rod (36) to rotate through the electrode driving piece (39), the solid electrorheological fluid (38) and the linkage piece (40); because the first conductive rod (35) and the second conductive rod (36) are respectively threaded with the first fixed sleeve (33) and the second fixed sleeve (34) and have opposite rotation directions, the rotation of the first conductive rod (35) and the second conductive rod (36) causes them to move away from each other under the action of the threads, and the first conductive rod (35) and the second conductive rod (36) are no longer in contact; ③ When the two conductive rods move away from each other by more than a certain distance, the grounding circuit of the electrode driving plate (39) is disconnected, and the electrorheological fluid (38) loses the electric field effect and turns into liquid, immersing the gap between the two conductive rods and thus extinguishing the arc.

2. The switch cabinet electric trolley according to claim 1, characterized in that: A plurality of second sliding grooves (5) are provided on one side of the first mounting plate (3), a second sliding block (8) is slidably connected in the second sliding groove (5), and one side of the second sliding block (8) is fixedly connected to the mounting frame (7).

3. The switch cabinet electric trolley according to claim 2, characterized in that: A ball (9) is provided on one side of the second sliding block (8), and the ball (9) rolls in the second sliding groove (5).

4. The switch cabinet electric trolley according to claim 1, characterized in that: The top end of the first threaded rod (10) is fixedly connected to an adjusting knob (11).

5. The switch cabinet electric trolley according to claim 1, characterized in that: The top of the vehicle frame (1) is fixedly connected to a side plate (2), a mechanism box (24) is fixedly connected between the side plate (2) and the first mounting plate (3), and a harmonic elimination device (23) is fixedly connected to one side of the first mounting plate (3).

6. The switch cabinet electric trolley according to claim 5, characterized in that: An observation window (25) is provided on one side of the side panel (2), and a lifting handle (26) is fixedly connected to one side of the side panel (2).

7. The switch cabinet electric trolley according to claim 1, characterized in that: A plurality of reinforcing ribs (27) are fixedly connected to one side of the mounting frame (7); an insulating plate (28) is fixedly connected to the bottom of the vehicle frame (1); and a plurality of rollers (29) are fixedly connected to the bottom of the insulating plate (28).

8. The switch cabinet electric trolley according to claim 5, characterized in that: A stepper motor (31) is fixedly connected to one side of the side plate (2); an output end of the stepper motor (31) is key-connected to a second threaded rod (30); and the second threaded rod (30) passes through the vehicle frame (1).

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