10kV floor type handcart solid-sealed vacuum circuit breaker

Abstract

The invention provides a 10kV floor type handcart solid-sealed vacuum circuit breaker, which is a technical scheme of a floor type solid-sealed vacuum circuit breaker with comprehensiveness and integrity, which is provided by carrying out adaptive improvement on the basis of the existing mature technical scheme of a middle-mounted circuit breaker. According to the technical scheme, the floor type circuit breaker can be produced on a mature middle-mounted circuit breaker production line, and production and quality inspection equipment and tools are universal with the existing mature production scheme; the problem that a brand new floor type circuit breaker and a production and quality inspection tool thereof must be designed for responding to the requirements of a small part of customers is solved, and the production cost can be greatly reduced on the basis of meeting the requirements of a part of customers and improving the integrity of a product line; the circuit breaker mechanism and the interlocking device are verified mature schemes, so that the stability of the device is ensured, and the tedious process and high cost of verifying mechanical and electrical characteristics in designing a brand-new floor type circuit breaker are avoided.

Description

Technical Field

[0001] This invention belongs to the field of medium and high voltage switch technology, specifically relating to a 10kV floor-mounted handcart-type solid vacuum circuit breaker. Background Technology

[0002] In the field of medium and high voltage power transmission and distribution, switchgear is widely used, and circuit breakers are important switching components within it. As a crucial element of switchgear, circuit breakers control the switching on and off of high-voltage systems and are vital control and protection devices. Vacuum circuit breakers are suitable for applications requiring frequent operation at rated operating current or for repeatedly interrupting short-circuit currents.

[0003] Existing medium- and high-voltage vacuum circuit breakers can be divided into centrally mounted and floor-mounted types based on their cabinet structure. CN207588335U discloses a floor-mounted circuit breaker trolley. Due to technological limitations, circuit breakers previously generally adopted a floor-mounted, non-solidified form, and the "five-proof interlocking" and other electrical interlocking devices were located outside the circuit breaker enclosure, resulting in complex transmission and unreliable interlocking devices. Furthermore, due to the lack of complete industry standards, the pole spacing of circuit breakers produced by different manufacturers varied significantly.

[0004] Most existing floor-mounted circuit breakers have a rated voltage of 35kV, with very few 10kV solid-insulated vacuum circuit breaker products. However, to meet the needs of some customers and to improve the completeness of the product line, it is necessary to develop technical solutions for 10kV floor-mounted solid-insulated vacuum circuit breakers. However, the overall market demand for this type of product is relatively small. Designing entirely new floor-mounted circuit breakers and their production and quality inspection fixtures to meet specific customer needs would significantly increase product costs, and the resulting entirely offline production, installation, and quality inspection would lead to a waste of human and material resources. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention provides a 10kV floor-mounted, handcart-type solid-sealed vacuum circuit breaker. The specific technical solution for achieving the technical effects of this invention is described below:

[0006] A floor-mounted circuit breaker includes a circuit breaker body and a frame.

[0007] The circuit breaker body is a center-mounted circuit breaker, and the circuit breaker body adopts a solid-sealed pole; the solid-sealed pole is provided with an upper terminal block and a lower terminal block, the upper terminal block is connected to an L-shaped copper busbar, and the lower terminal block is connected to an L-shaped copper busbar.

[0008] A chassis is connected to the bottom of the circuit breaker body, and the chassis is equipped with a limit plate; the frame is equipped with a fixed frame, and the limit plate is sleeved with the fixed frame to realize the connection between the chassis and the frame.

[0009] A top plate is provided above the frame, and a plug interlocking device, a moving plug, and a stationary socket are provided above the top plate;

[0010] The frame is provided with a movable frame, and the movable frame is provided with casters;

[0011] The frame is equipped with a positioning limit device and an anti-tipping limit device;

[0012] The floor-mounted circuit breaker is equipped with a matching switch cabinet, and the floor-mounted circuit breaker is equipped with a detachable grounding device; the detachable grounding device includes a detachable grounding copper braid grounding device between the circuit breaker body and the fixed frame, and a screw grounding device between the fixed frame and the switch cabinet.

[0013] An aluminum rod pad is provided between the upper cable outlet and the L-shaped copper busbar, and an aluminum rod pad is provided between the lower cable outlet and the L-shaped copper busbar.

[0014] The horizontal portion of the L-shaped copper busbar is provided with a vertical support rod. One end of the support rod is connected to the horizontal portion of the L-shaped copper busbar, and the other end is connected to the frame.

[0015] The positioning and limiting device consists of alternately installed positioning and limiting plates on the frame and the switch cabinet;

[0016] The positioning and limiting plate enables the floor-mounted circuit breaker to be compatible with the corresponding switch cabinet when the floor-mounted circuit breaker and the switch cabinet are installed together without collision or interference between them.

[0017] The anti-tipping limiting device consists of an anti-tipping limiting plate installed on the frame and a matching anti-tipping sliding groove installed on the switch cabinet.

[0018] The anti-tipping limit plate and the anti-tipping groove can limit the angle range of the floor-mounted circuit breaker tilting forward or backward when it moves into the switch cabinet.

[0019] The movable frame is equipped with a door push plate, which can push open the switch cabinet door when the floor-mounted circuit breaker enters the switch cabinet.

[0020] The limiting plate is equipped with a telescopic adjustment mechanism, which allows the limiting plate to repeatedly connect and disconnect from the fixed frame.

[0021] The chassis vehicle is equipped with a chassis vehicle handle, a chassis vehicle crank handle, a chassis vehicle crank handle hole, and a chassis vehicle screw that mates with the chassis vehicle crank handle hole;

[0022] The telescopic adjustment mechanism is located between the chassis handlebars and the limiting plate. Adjusting the chassis handlebars can repeatedly connect and disconnect the limiting plate from the fixed frame.

[0023] The plug interlocking device includes a plug limiting plate, a pin, a stop, a positioning frame, a type I screw, a type I nut, a torsion spring, a cotter pin, a limiting flat washer, a type II screw, a type II nut, and a support.

[0024] The plug limiting plate and the support are provided with screw holes that mate with Type II screws; the support and the positioning frame are provided with through holes that mate with pins; the positioning frame is provided with screw holes that mate with Type I screws; the pin is provided with through holes that mate with cotter pins; the plug limiting plate and the support are connected by Type II screws and Type II nuts.

[0025] The support and the positioning frame are connected by inserting a pin into a matching through hole. After the pin passes through the through hole, its two ends are fixed with retainers. A torsion spring and a limiting flat washer are installed on the pin. The cotter pin passes into the through hole provided on the pin to limit the limiting flat washer and the torsion spring. The torsion spring is limited by type II screws and type II nuts, as well as type I screws and type I nuts.

[0026] The positioning frame is fixed to the upper surface of the top plate.

[0027] Beneficial effects

[0028] This invention provides a 10kV floor-mounted, truck-mounted, solid-sealed vacuum circuit breaker. The technical solution of this vacuum circuit breaker is an adaptive adjustment and improvement based on existing mature center-mounted circuit breaker technology, resulting in a comprehensive and complete floor-mounted, solid-sealed vacuum circuit breaker technical solution. Compared with existing technologies, the beneficial effects of this technical solution include:

[0029] 1) This invention adapts and improves upon existing mature medium-voltage circuit breaker technology by setting up a rack for the 10kV medium-voltage circuit breaker to achieve the function of floor-mounted circuit breaker.

[0030] The proposed technical solution enables floor-mounted circuit breakers to be produced on mature mid-mounted circuit breaker production lines, and the production and quality inspection equipment and tooling are compatible with existing mature production solutions. It solves the problem of having to design entirely new floor-mounted circuit breakers and their production and quality inspection tooling to meet the needs of a small number of customers, and can significantly reduce production costs while meeting the needs of some customers and improving the completeness of the product line.

[0031] Meanwhile, the circuit breaker mechanism and interlocking device are proven and mature solutions; this not only ensures the stability of the device, but also avoids the cumbersome process and high cost of verifying the mechanical and electrical characteristics required for designing a completely new floor-mounted circuit breaker.

[0032] 2) In the prior art, when transferring floor-mounted circuit breakers between the test position and the working position, a propulsion mechanism is often used. In this invention, a chassis vehicle is used to move the frame, which is convenient for installation and also saves costs.

[0033] 4) In existing technologies, 10kV circuit breakers mostly use non-solid-sealed poles, and the pole spacing dimensions vary between different manufacturers, making it impossible to interchange products from different manufacturers. This invention uses solid-sealed poles with L-shaped copper busbars installed at the upper and lower terminal blocks. Depending on the pole spacing, only the length of the copper busbar needs to be changed, achieving better performance while using industry-standard solid-sealed pole dimensions, avoiding the need to design non-standard products and re-mold.

[0034] 5) In existing technologies, traditional floor-mounted circuit breakers require adjustments to the type and location of the grounding busbars based on the grounding method of the switchgear. The grounding methods of switchgear produced by different manufacturers vary significantly, failing to meet the requirements of standardized production. This invention employs a special copper braided strip grounding method, using copper braided strips to achieve contact between the circuit breaker, frame, and switchgear body, enabling interchangeability between different grounding methods.

[0035] 6) The present invention adopts a simple and reliable plug interlocking device. When the circuit breaker moves between the working position and the test position, the plug cannot fall off or be pulled out, which can improve the safety of the working process.

[0036] 7) When there are many switchgear cabinets on site, the circuit breakers in different switchgear cabinets may not be interchangeable. In this case, the addition or replacement of circuit breakers may result in incompatibility with the switchgear cabinets, leading to switchgear malfunction or even accidents. This invention uses an easily installed, disassembled, and replaceable limit device to ensure that the circuit breaker can only be used with a matching switchgear cabinet, which simplifies the workflow and improves the safety of the operation. Attached Figure Description

[0038] Figure 1 This is one of the overall assembly diagrams of the present invention;

[0039] Figure 2 This is the second schematic diagram of the overall assembly of the present invention;

[0040] Figure 3 This is a schematic diagram of a circuit breaker limit switch;

[0041] Figure 4 This is one of the schematic diagrams showing the installation of the chassis and the fixed frame;

[0042] Figure 5 This is the second schematic diagram of the chassis and fixed frame installation.

[0043] Figure 6 This is the third schematic diagram of the chassis and fixed frame installation;

[0044] Figure 7 This is a schematic diagram of a secondary plug interlocking device;

[0045] Figure 8 This is a schematic diagram of the operation of the secondary plug interlocking device.

[0046] The diagram is labeled as follows:

[0047] 1. Solid-sealed pole;

[0048] 2. Aluminum rod spacer;

[0049] 3. L-shaped copper busbar;

[0050] 4. L-shaped copper busbar;

[0051] 5. Contacts;

[0052] 6. Nylon support rod;

[0053] 7. Angle plate;

[0054] 8. Door push plate;

[0055] 9. Casters;

[0056] 10. Rack;

[0057] 11. Anti-tipping limit plate;

[0058] 12. Fixed frame; 12-1. Fixed frame connecting plate; 12-2. Fixed frame panel; 12-3. Connecting plate mounting holes; 12-4. Fixed frame connecting slot; 12-5. Switch cabinet fixing holes;

[0059] 13. Chassis vehicle; 13-1. Chassis vehicle handle; 13-2. Chassis vehicle limit plate; 13-3. Chassis vehicle crank handle hole; 13-4. Chassis vehicle bolt;

[0060] 14. Handle;

[0061] 15. Plug interlocking device; 15-1. Plug limiting plate; 15-2. Pin; 15-3. Stop; 15-4. Positioning bracket; 15-5. Type I screw; 15-6. Type I nut; 15-7. Torsion spring; 15-8. Cotter pin; 15-9. Limiting flat washer; 15-10. Type II screw; 15-11. Type II nut; 15-12. Support;

[0062] 16. Top slab;

[0063] 17. Positioning limit plate;

[0064] 18. Mobile frame;

[0065] 19. Circuit breaker body;

[0066] 20. Static socket;

[0067] 21. Moving plug;

[0068] 22. Grounding copper braided tape;

[0069] In addition, the figure also includes the vertical direction mark A, the counterclockwise rotation direction mark B, and the switch cabinet III mark (not all components are shown in the figure) and the switch cabinet plug interlocking groove I mark. Detailed Implementation

[0070] Example

[0071] This embodiment describes the structure and working principle of a 10kV floor-mounted handcart-type solid vacuum circuit breaker. To ensure accuracy and clarity, the description of the working principle inevitably involves components that are not protected in this technical solution, such as switchgear. Therefore, this description is provided here.

[0072] The mating components not protected in the technical solution provided by this invention and the accompanying drawings mainly include: switch cabinet III, switch cabinet guide rail, test position of switch cabinet, working position of switch cabinet, switch cabinet door, plug interlocking mating groove I of switch cabinet, positioning limit plate of switch cabinet, anti-tipping slide groove II of switch cabinet, and connecting contact of switch cabinet.

[0073] The following text combines Figures 1-8 The structure and working principle of a 10kV floor-mounted handcart-type solid vacuum circuit breaker provided by the present invention are described.

[0074] 1. Description and introduction of the circuit breaker body 19 and its accessories

[0075] 1.1 Description of the circuit breaker body 19

[0076] The circuit breaker body 19 is a center-mounted circuit breaker. In this embodiment, the circuit breaker body 19 adopts a 10kV solid-sealed pole type circuit breaker.

[0077] The upper and lower outlet seats of the solid-sealed pole 1 are equipped with L-shaped copper busbars 3 and 4; one end of the L-shaped copper busbars 3 and 4 is connected to the outlet seat of the solid-sealed pole, and the other end is provided with a contact 5.

[0078] The upper and lower outlet terminals of the solid-sealed pole can be equipped with aluminum rod pads 2. One end of the aluminum rod pad is connected to the upper and lower outlet terminals of the solid-sealed pole, and the other end is connected to the L-shaped copper busbar 3 or L-shaped copper busbar 4. In this embodiment, the lower outlet terminal is connected with aluminum rod pads 2 to increase the air insulation distance between the L-shaped copper busbar 4 and the chassis.

[0079] The L-shaped copper busbars 3 and 4 can be equipped with nylon support rods 6 to prevent deformation when they are in operation, thereby avoiding poor contact. The nylon support rods 6 are rigid rods made of nylon, with one end screwed to the horizontal part of the L-shaped copper busbar and the other end connected to the L-shaped support rod bracket located at the tail of the movable frame. In this embodiment, the horizontal part of the L-shaped copper busbar 4 is provided with nylon support rods 6.

[0080] The circuit breaker body 19 is provided with a through hole that mates with the grounding copper braid 22 for installing the other end of the grounding copper braid 22; for details of the grounding device, please refer to the description of the grounding device in section 3.1 below.

[0081] 1.2 Description of Circuit Breaker Chassis Vehicle 13

[0082] The circuit breaker body 19 is connected to a chassis vehicle 13 below it; the circuit breaker body 19 is connected to the chassis vehicle 13 by screws.

[0083] The chassis 13 is equipped with a chassis handle 13-1, a chassis limiting plate 13-2, a chassis crank hole 13-3, and a chassis screw 13-4 that mates with the chassis crank hole 13-3 (the chassis crank is not shown in the figure and adopts a conventional design).

[0084] The chassis 13 is connected to the frame 10 via a fixed frame 12; for details of the connection method, please refer to the description of the fixed frame 12 in section 2.1 below.

[0085] 2. Description and introduction of rack 10 and its accessories

[0086] The frame 10 is provided with a fixed frame 12, a top plate 16 is provided above the frame 10, a movable frame 18 is provided below the frame 10, a handle 14 is provided on the frame 10, and an anti-tipping limit plate 11 and a positioning limit plate 17 are provided on the frame 10.

[0087] 2.1 Description of Fixed Frame 12

[0088] The fixed frame 12 is provided with a fixed frame connecting plate 12-1, a fixed frame panel 12-2, a switch cabinet fixing hole 12-5, and a grounding copper braid 22; the fixed frame connecting plate 12-1 is provided with a connecting plate mounting hole 12-3 and a fixed frame connecting slot 12-4.

[0089] The fixed frame connecting plate 12-1 and the fixed frame panel 12-2 are connected by screws through the connecting plate mounting holes 12-3; the chassis 13 of the circuit breaker body 19 is connected to the frame 10 through the fixed frame 12.

[0090] A telescopic adjustment mechanism is provided between the chassis handle 13-1 and the chassis limit plate 13-2. By adjusting the chassis handle 13-1, the chassis limit plate 13-2 can be extended and retracted to engage and disengage with the fixed frame connection slot 12-4, thereby realizing the connection and disengagement of the chassis 13 and the fixed frame 12.

[0091] For a detailed description of the grounding copper braid 22, please refer to section 3.1 below for the description of the grounding device;

[0092] 2.2 Description of Top Plate 16

[0093] The circuit breaker stationary plug 20, moving plug 21, and plug interlock 15 are installed above the top plate 16; the plug interlock 15 includes a plug limiting plate 15-1, a pin 15-2, a stop 15-3, a positioning bracket 15-4, a type I screw 15-5, a type I nut 15-6, a torsion spring 15-7, a cotter pin 15-8, a limiting flat washer 15-9, a type II screw 15-10, a type II nut 15-11, and a support 15-12;

[0094] The plug limiting plate 15-1 and the support member 15-12 are provided with screw holes that mate with type II screws 15-10; the support member 15-12 and the positioning frame 15-4 are provided with through holes that mate with pins 15-2; the positioning frame 15-4 is provided with screw holes that mate with type I screws 15-5; the pin 15-2 is provided with through holes that mate with cotter pins 15-8.

[0095] The plug limiting plate 15-1 and the support 15-12 are connected by type II screws 15-10 and type II nuts 15-11;

[0096] The support 15-12 and the positioning frame 15-4 are connected by inserting the pin 15-2 into the matching through hole. After the pin 15-2 passes through the through hole, its two ends are fixed with the retainer 15-3.

[0097] A torsion spring 15-7 and a limiting flat washer 15-9 are threaded through the pin 15-2. The cotter pin 15-8 is inserted into the through hole provided on the pin 15-2 to limit the limiting flat washer 15-9 and the torsion spring 15-7. The torsion spring 15-7 is limited by type II screw 15-10, type II nut 15-11, type I screw 15-5, and type I nut 15-6.

[0098] The positioning frame 15-4 is fixed to the upper surface of the top plate 16;

[0099] 2.3 Description and introduction of the mobile frame 18

[0100] The movable frame 18 is connected to the frame 10 by screws. The movable frame 18 is threaded with movable wheels 9 and door push plates 8 on both sides. The switch cabinet III is provided with guide rails that cooperate with the movable wheels 9. The switch cabinet III is provided with a cabinet door, which can be pushed open by the door push plate 8.

[0101] 3. Other instructions regarding floor-mounted circuit breakers

[0102] 3.1 Description of Grounding Device

[0103] The fixed frame 12 is provided with a grounding copper braid 22. One end of the grounding copper braid 22 is connected to the lower end of the fixed frame panel 12-2, and the other end is connected to the circuit breaker body. The circuit breaker body has a matching through hole for installing the other end of the grounding copper braid 22.

[0104] The fixed frame 12 is provided with switch cabinet fixing holes 12-5;

[0105] After the circuit breaker body 19 and the frame 10 are fully assembled, the grounding copper braid 22 connects the circuit breaker body 19 to the fixed frame 12; push the handle 14 to move the floor-mounted circuit breaker to the test position of switch cabinet III, and connect the switch cabinet fixing hole 12-5 on the fixed frame 12 with the through hole on the housing at the door of switch cabinet III using screws. At this time, the fixed frame 12 is connected to switch cabinet III, the floor-mounted circuit breaker is in the test position, the moving wheel 9 of the floor-mounted circuit breaker is connected to the switch cabinet guide rail, and the grounding of the floor-mounted circuit breaker and the switch cabinet is connected.

[0106] 3.2 Description of the plug interlocking device

[0107] The frame 10 has a matching through hole on the side near the plug interlocking device 15, allowing the plug limiting plate 15-1 to extend out.

[0108] During the assembly process, according to Figure 8 Press the protruding part of the plug limiting plate 15-1 in the direction indicated by mark A, and under the action of transmission, the support 15-12 presses down. Figure 8 Make a circular motion in the direction indicated by mark B. At this time, the plug interlocking device is opened, and the moving plug 21 can be inserted into (or pulled out) the stationary socket 20. Release the pressing force in direction A, and the support 15-12 will reset under the action of the torsion spring and press the moving plug 21 (assuming the moving plug 21 is inserted).

[0109] When the circuit breaker is assembled and moved from the test position to the working position, the plug limiting plate 15-1 is located in the plug interlocking groove I of switchgear III. At this time, the plate cannot move. Figure 8 The movement is in the direction marked A, so the support 15-12 cannot make the circular movement in the direction marked B. At this time, the plug interlocking device cannot be opened, and the dynamic plug 21 is stably connected to the static socket 20.

[0110] 3.3 Description of the limit device

[0111] This floor-mounted circuit breaker is equipped with two limiting devices, which work together to position and limit the floor-mounted circuit breaker.

[0112] Angle plate 7 is provided on the frame 10; the frame 10 and the angle plate 7 are provided with matching screw holes, and a circuit breaker positioning and limiting plate 17 can be adapted to be installed between the frame 10 and the angle plate 7. The frame 10, the positioning and limiting plate 17 and the angle plate 7 are installed by stacking screws.

[0113] like Figure 3 As shown, switch cabinet III is equipped with a matching positioning limit plate 17. The specially arranged positioning limit plate 17 can play a role in differentiation and positioning, so as to realize that the floor-mounted circuit breaker can only be matched with the matching switch cabinet.

[0114] In this embodiment, the positioning limit plate 17 on the floor-mounted circuit breaker and the positioning limit plate 17 of the switch cabinet are installed alternately; when the floor-mounted circuit breaker is moved from the test position to the working position, the circuit breaker can be put into the corresponding switch cabinet only if the positioning limit plates 17 do not collide or interfere with each other.

[0115] The frame is equipped with an anti-tipping limit plate 11; the switch cabinet III is equipped with a matching anti-tipping groove II; when the floor-mounted circuit breaker is moved from the test position to the working position, the anti-tipping limit plate 11 is located in the anti-tipping groove of the switch cabinet III. Under normal circumstances, the anti-tipping limit plate 11 will not contact the limit groove. When the floor-mounted circuit breaker tilts forward or backward beyond a certain angle, the anti-tipping limit plate 11 contacts the upper or lower end of the anti-tipping groove and prevents the floor-mounted circuit breaker from tilting further.

[0116] 3.4 Explanation of the transfer of floor-mounted circuit breakers from the test position to the working position

[0117] Switchgear III is equipped with a connecting contact that mates with contact 5;

[0118] After the floor-mounted circuit breaker is assembled and enters the test position, the moving wheel 9 is located on the guide rail of the switchgear. The chassis trolley handle is inserted into the chassis trolley handle hole 13-3 and engages with the chassis trolley screw 13-4. The chassis trolley handle is turned, and the chassis trolley screw 13-4 rotates, pushing the floor-mounted circuit breaker from the test position to the working position. When the floor-mounted circuit breaker moves from the test position to the working position, the circuit breaker moving wheel 9 moves on the guide rail, opens the switchgear cabinet door through the valve push plate 8, and stops after reaching the working position. The contact 5 engages with the switchgear connecting contact, and the floor-mounted circuit breaker enters the working state.

Claims

1. A floor-mounted circuit breaker, comprising a circuit breaker body and a frame, characterized in that, The circuit breaker body is a center-mounted circuit breaker, and the circuit breaker body adopts a solid-sealed pole; the solid-sealed pole is provided with an upper terminal block and a lower terminal block, the upper terminal block is connected to an L-shaped copper busbar, and the lower terminal block is connected to an L-shaped copper busbar. A chassis is connected to the bottom of the circuit breaker body, and the chassis is equipped with a limit plate; the frame is equipped with a fixed frame, and the limit plate is sleeved with the fixed frame to realize the connection between the chassis and the frame. A top plate is provided above the frame, and a plug interlocking device, a moving plug, and a stationary socket are provided above the top plate; The frame is provided with a movable frame, and the movable frame is provided with casters; The frame is equipped with a positioning limit device and an anti-tipping limit device; The floor-mounted circuit breaker is equipped with a matching switch cabinet, and the floor-mounted circuit breaker is equipped with a detachable grounding device; the detachable grounding device includes a detachable grounding copper braid grounding device between the circuit breaker body and the fixed frame, and a screw grounding device between the fixed frame and the switch cabinet.

2. The floor-mounted circuit breaker as described in claim 1, characterized in that, An aluminum rod pad is provided between the upper cable outlet and the L-shaped copper busbar, and an aluminum rod pad is provided between the lower cable outlet and the L-shaped copper busbar.

3. The floor-mounted circuit breaker as described in claim 1, characterized in that, The horizontal portion of the L-shaped copper busbar is provided with a vertical support rod. One end of the support rod is connected to the horizontal portion of the L-shaped copper busbar, and the other end is connected to the frame.

4. The floor-mounted circuit breaker as described in claim 1, characterized in that, The positioning and limiting device consists of alternately installed positioning and limiting plates on the frame and the switch cabinet; The positioning and limiting plate ensures that when the floor-mounted circuit breaker is installed in conjunction with the switch cabinet, the positioning and limiting plate on the frame and the switch cabinet will not collide or interfere with each other, so that the floor-mounted circuit breaker can be adapted to the corresponding switch cabinet.

5. The floor-mounted circuit breaker as described in claim 1, characterized in that, The anti-tipping limiting device consists of an anti-tipping limiting plate installed on the frame and a matching anti-tipping sliding groove installed on the switch cabinet. The anti-tipping limit plate and the anti-tipping slide can limit the angle range of the floor-mounted circuit breaker tilting forward or backward when it moves into the switch cabinet.

6. The floor-mounted circuit breaker as described in claim 1, characterized in that, The movable frame is equipped with a door push plate, which can push open the switch cabinet door when the floor-mounted circuit breaker enters the switch cabinet.

7. The floor-mounted circuit breaker as described in claim 1, characterized in that, The limiting plate is equipped with a telescopic adjustment mechanism, which allows the limiting plate to repeatedly connect and disconnect from the fixed frame.

8. The floor-mounted circuit breaker as described in claim 7, characterized in that, The chassis vehicle is equipped with a chassis vehicle handle, a chassis vehicle crank handle, a chassis vehicle crank handle hole, and a chassis vehicle screw that mates with the chassis vehicle crank handle hole; The telescopic adjustment mechanism is located between the chassis handlebars and the limiting plate. Adjusting the chassis handlebars can repeatedly connect and disconnect the limiting plate from the fixed frame.

9. The floor-mounted circuit breaker as described in claim 1, characterized in that, The plug interlocking device includes a plug limiting plate, a pin, a stop, a positioning frame, a type I screw, a type I nut, a torsion spring, a cotter pin, a limiting flat washer, a type II screw, a type II nut, and a support. The plug limiting plate and the support are provided with screw holes that mate with Type II screws; the support and the positioning frame are provided with through holes that mate with pins; the positioning frame is provided with screw holes that mate with Type I screws; the pin is provided with through holes that mate with cotter pins; the plug limiting plate and the support are connected by Type II screws and Type II nuts. The support and the positioning frame are connected by inserting a pin into a matching through hole. After the pin passes through the through hole, its two ends are fixed with retainers. A torsion spring and a limiting flat washer are installed on the pin. The cotter pin passes into the through hole provided on the pin to limit the limiting flat washer and the torsion spring. The torsion spring is limited by type II screws and type II nuts, as well as type I screws and type I nuts. The positioning frame is fixed to the upper surface of the top plate.

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