A quick-acting structure for a circuit breaker

Abstract

This invention provides a quick-acting structure for a circuit breaker, relating to the field of circuit breaker technology, comprising: a rail plate; a circuit breaker body mounted on the rail plate, a fixing plate fixed to the front end of the circuit breaker body, a slide rail mounted to the rear end of the fixing plate by bolts, a slider sliding on the slide rail, and an L-shaped seat fixed on the slider; this invention uses a first motor to drive a first transmission belt to move the L-shaped seat downwards, retracting a first hydraulic rod to rotate the tilting seat clockwise, at which point the pressing wheel can contact and press the reset button; a second motor to drive a second transmission belt to rotate the rotating arm counterclockwise, and two sets of clamps to move the control handle upwards to the conducting position, thus resetting the circuit breaker, saving time and effort; and a third motor to drive a first transmission belt to move the L-shaped seat upwards, retracting a first hydraulic rod to rotate the tilting seat clockwise, causing the pressing wheel to press on the test button, enabling rapid safety testing of the circuit breaker.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and more particularly to a quick-acting structure for a circuit breaker. Background Technology

[0002] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions and capable of closing, carrying, and interrupting current under abnormal circuit conditions within a specified time. Circuit breakers can be used as a substitute for fuses. Unlike fuses, which, once deactivated, must be replaced, circuit breakers can be reset and resume normal operation. This invention provides a quick-acting structure for a circuit breaker.

[0003] After a circuit breaker trips, it requires manual pressing of the reset button and then moving the control handle to the on position. Furthermore, circuit breakers are usually installed in switch boxes or high up on walls, making resetting them time-consuming, labor-intensive, and inconvenient. Summary of the Invention

[0004] This disclosure relates to a quick-acting structure for a circuit breaker, which solves the problem that existing circuit breakers require manual pressing of a reset button and then moving the control handle to the conducting position after tripping, which is time-consuming, labor-intensive, and inconvenient.

[0005] In a first aspect, this disclosure provides a quick-acting structure for a circuit breaker, specifically comprising: a rail plate; and a circuit breaker body mounted on the rail plate.

[0006] The circuit breaker body has a first and a second locking seat fixed at its rear end. A locking plate slides on the second locking seat, and a spring is installed between the locking plate and the second locking seat. The circuit breaker body is locked to the rail plate by the first locking seat and the locking plate. A test button and a reset button are provided at the front end of the circuit breaker body, and a fixing plate is fixed at the front end of the circuit breaker body. A slide rail is bolted to the rear end of the fixing plate, and a slider slides on the slide rail. An L-shaped seat is fixed on the slider, and a first motor is bolted to the fixing plate. A pulley is installed on the output shaft of the first motor, and a pulley is installed at the lower end of the fixing plate via a bearing. A transmission belt is connected between the pulley on the output shaft of the first motor and the pulley at the lower end of the fixing plate. The first transmission belt is fixedly connected to the front end of the L-shaped seat. Two sets of rails are fixed on the L-shaped seat, and lifting blocks slide on both sets of rails. A bracket is fixed to the rear end of the two sets of lifting blocks, and a hydraulic rod is installed between the L-shaped seat and the bracket.

[0007] In at least some embodiments,

[0008] A U-shaped plate is fixed on the L-shaped seat, and an L-shaped groove is provided on the U-shaped plate. A flip seat is installed on the bracket, and a first shaft, a second shaft, and a third shaft are fixed on the flip seat. The first shaft is rotatably connected to the bracket, the second shaft moves in the L-shaped groove on the U-shaped plate, and the third shaft contacts the upper end of the bracket.

[0009] In at least some embodiments,

[0010] The flipping seat is provided with six sets of intermediate seats. Two sets of partition blocks are installed between the intermediate seats and the flipping seat by bolts. A control plate is installed between the six sets of intermediate seats and the flipping seat. The control plate is provided with an arc-shaped groove.

[0011] In at least some embodiments,

[0012] A cylinder seat is hinged to the flipping seat, and a second hydraulic rod is hinged to the cylinder seat. The piston rod of the second hydraulic rod is connected to the control plate through a pin. A movable seat slides between two adjacent sets of intermediate seats. The lower end of the movable seat moves in the arc-shaped groove on the control plate, and a clamping plate is installed on the movable seat by bolts. A cover plate is installed on the upper end of the six sets of intermediate seats by bolts, and a fixing column is clamped between the six sets of clamping plates.

[0013] In at least some embodiments,

[0014] A fixed cylinder is fixed on the fixed column. A top cover is installed on the upper end of the fixed cylinder by bolts. An adjusting screw is installed on the top cover by a locking ring. A second spring is installed on the adjusting screw. A movable column is movably connected to the lower end of the fixed cylinder. A threaded hole is provided at the upper end of the movable column. A pressing wheel is installed at the lower end of the movable column by bolts. The lower end of the adjusting screw is threaded into the threaded hole at the upper end of the movable column.

[0015] In at least some embodiments,

[0016] The circuit breaker body is equipped with a control handle. A side plate is bolted to the left end of the circuit breaker body. The edge of the side plate is provided with a groove. A second transmission belt is installed in the groove. A gearbox is bolted to the side plate. A second motor is bolted to the gearbox. A pulley is installed on the output shaft of the gearbox. The second transmission belt is looped on the pulley on the output shaft of the gearbox.

[0017] In at least some embodiments,

[0018] An adjusting plate is bolted to the side plate. The adjusting plate has a sleeve groove. A tensioning wheel is mounted on the adjusting plate via a bearing. The tensioning wheel presses down on the second transmission belt. A rotating arm rotates on the side plate. An arc-shaped through groove is provided on the side plate. A connecting block is installed in the arc-shaped through groove. The connecting block is bolted to the rotating arm.

[0019] In at least some embodiments,

[0020] A connecting seat is bolted to the left side of the rotating arm. The connecting seat is fixedly connected to the second transmission belt. A threaded rod rotates on the connecting seat. A handwheel is fixed on the threaded rod. A sliding seat slides on the right side of the rotating arm. A connecting plate is threaded onto the threaded rod. The connecting plate is bolted to the left side of the sliding seat.

[0021] In at least some embodiments,

[0022] A rotating seat is mounted on the right end of the sliding seat via a bearing. A hinge seat is mounted on the rotating seat via bolts. Two sets of clamping plates are hinged on the hinge seat. A round rod is fixed to the left end of each set of clamping plates. A No. 1 seat slides on the round rod. A No. 2 seat is hinged to the No. 1 seat. The right ends of the two sets of clamping plates are in contact with the upper and lower ends of the control handle, respectively.

[0023] In at least some embodiments,

[0024] Two sets of guide rods are fixed on the rotating seat, and a movable seat slides on the two sets of guide rods. A lead screw is installed between the two sets of guide rods through a bearing. The lead screw is threaded into the movable seat. A second handwheel is fixed on the lead screw. Connecting plates are connected between the movable seat and the second seat, and between the rotating seat and the second seat.

[0025] This invention provides a quick-acting structure for a circuit breaker, which has the following advantages:

[0026] When resetting the circuit breaker, this invention first uses a first motor to drive a first transmission belt to move the L-shaped seat downwards, and retracts a first hydraulic rod to lower the position of the tilting seat. When the tilting seat descends to the corner of the L-shaped groove on the U-shaped plate, the bracket pulls the tilting seat forward and downwards. At this time, the front side of the tilting seat flips downwards, that is, the tilting seat flips clockwise. At this time, the pressing wheel can contact the reset button and press it down. Then, a second motor is run to drive a second transmission belt to rotate the rotating arm counterclockwise. Through two sets of clamps, the control handle is pulled upwards to the conducting position, realizing the reset of the circuit breaker, which saves time and effort.

[0027] Furthermore, in this invention, by running the No. 1 motor to drive the No. 1 transmission belt to move the L-shaped seat upward, and retracting the No. 1 hydraulic rod to rotate the flipping seat clockwise, the extrusion wheel presses onto the test button, which can quickly perform a safety test on the circuit breaker. The pressing depth of the extrusion wheel can be controlled by rotating the adjusting screw. Rotating the No. 1 handwheel to rotate the threaded rod can adjust the position of the rotating seat. Rotating the No. 2 handwheel to rotate the lead screw can adjust the clamping tightness of the two sets of clamps on the control handle. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0029] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0030] In the attached diagram:

[0031] Figure 1 This diagram illustrates the overall front-end structure of the present application.

[0032] Figure 2 A schematic diagram of the overall back-end structure of this application is shown;

[0033] Figure 3 This application shows Figure 2 A magnified structural diagram of part A in the middle;

[0034] Figure 4 This application shows Figure 1 A magnified structural diagram of part B in the middle section;

[0035] Figure 5 A schematic diagram of the structure of the fixing plate of this application is shown;

[0036] Figure 6 This application shows Figure 5 A magnified structural diagram of section C;

[0037] Figure 7 A schematic diagram of the structure of the flip-up seat of this application is shown;

[0038] Figure 8 A schematic diagram of the control board of this application is shown;

[0039] Figure 9 A schematic diagram of the structure of the fixed column of this application is shown;

[0040] Figure 10 A schematic diagram of the side plate of this application is shown;

[0041] Figure 11 This application shows Figure 10 A magnified structural diagram of section D in the middle;

[0042] Figure 12 A schematic diagram of the rotating arm of this application is shown;

[0043] Figure 13 A schematic diagram of the left side of the rotary seat and hinge seat of this application is shown;

[0044] Figure 14 A schematic diagram of the rotating base of this application is shown.

[0045] List of reference numerals in the attached diagram:

[0046] 1. Rail plate; 2. Circuit breaker body; 21. No. 1 card holder; 22. No. 2 card holder; 221. Locking plate; 222. No. 1 spring; 23. Fixing plate; 231. Slide rail; 232. No. 1 motor; 233. No. 1 transmission belt; 234. Sliding block; 235. L-shaped seat; 2351. Rail rod; 2352. Lifting block; 236. Bracket; 2361. No. 1 hydraulic rod; 237. U-shaped plate; 238. Tilting seat; 2381. No. 1 shaft; 2382. No. 2 shaft; 23 83. Shaft No. 3; 2384. Intermediate seat; 2385. Divider block; 2386. Control panel; 2387. Cylinder seat; 2388. Hydraulic rod No. 2; 239. Movable seat; 2391. Clamping plate; 2392. Cover plate; 24. Test button; 25. Reset button; 26. Control handle; 27. Fixed column; 271. Fixed cylinder; 272. Top cover; 2721. Adjusting screw; 2722. Spring No. 2; 273. Movable column; 2731. Extrusion roller; 3. Side plate; 31. Gearbox; 311. No. 2 motor; 312. Adjusting plate; 3121. Tensioning wheel; 313. No. 2 transmission belt; 32. Rotating arm; 321. Connecting block; 322. Connecting seat; 323. Sliding seat; 324. Connecting plate; 325. Threaded rod; 3251. No. 1 handwheel; 33. Rotating seat; 331. Hinge seat; 332. Clamping plate; 3321. No. 1 seat; 3322. No. 2 seat; 3323. Connecting plate; 333. Guide rod; 334. Lead screw; 3341. No. 2 handwheel; 335. Moving seat. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] Example 1: Please refer to Figures 1 to 14 :

[0049] This invention proposes a quick-acting structure for a circuit breaker, comprising: a rail plate 1; and a circuit breaker body 2 mounted on the rail plate 1.

[0050] The rear end of the circuit breaker body 2 is fixed with a first retaining seat 21 and a second retaining seat 22. A locking piece 221 slides on the second retaining seat 22, and a first spring 222 is installed between the locking piece 221 and the second retaining seat 22. The circuit breaker body 2 is locked to the rail plate 1 by the first retaining seat 21 and the locking piece 221. The front end of the circuit breaker body 2 is provided with a test button 24 and a reset button 25, and a fixing plate 23 is fixed to the front end of the circuit breaker body 2. A slide rail 231 is installed at the rear end of the fixing plate 23 by bolts. A slider 234 slides on the slide rail 231, and an L-shaped seat 235 is fixed on the slider 234. The fixing plate 23 is further secured by... A first motor 232 is bolted on. A pulley is mounted on the output shaft of the first motor 232. A pulley is mounted on the lower end of the fixed plate 23 via a bearing. A first transmission belt 233 is connected between the pulley on the output shaft of the first motor 232 and the pulley at the lower end of the fixed plate 23. The first transmission belt 233 is fixedly connected to the front end of the L-shaped seat 235. Two sets of rail rods 2351 are fixed on the L-shaped seat 235. Lifting blocks 2352 slide on both sets of rail rods 2351. A bracket 236 is fixed at the rear end of the two sets of lifting blocks 2352. A first hydraulic rod 2361 is installed between the L-shaped seat 235 and the bracket 236.

[0051] In this embodiment of the disclosure,

[0052] A U-shaped plate 237 is fixed on the L-shaped seat 235. An L-shaped groove is provided on the U-shaped plate 237. A tilting seat 238 is mounted on the bracket 236. A first shaft 2381, a second shaft 2382, and a third shaft 2383 are fixed on the tilting seat 238. The first shaft 2381 is rotatably connected to the bracket 236. The second shaft 2382 moves within the L-shaped groove on the U-shaped plate 237. The third shaft 2383 contacts the upper end of the bracket 236. Six sets of intermediate seats 2384 are provided on the tilting seat 238. Two sets of partition blocks 2385 are bolted between each of the intermediate seats 2384 and the tilting seat 238. The six sets of intermediate seats 2384 are connected to the tilting seat 238. A control board 2386 is installed, and an arc-shaped groove is provided on the control board 2386. A cylinder seat 2387 is hinged to the tilting seat 238, and a second hydraulic rod 2388 is hinged to the cylinder seat 2387. The piston rod of the second hydraulic rod 2388 is connected to the control board 2386 via a pin. A movable seat 239 slides between two adjacent sets of intermediate seats 2384. The lower end of the movable seat 239 moves within the arc-shaped groove on the control board 2386, and a clamping plate 2391 is bolted to the movable seat 239. A cover plate 2392 is bolted to the upper end of the six sets of intermediate seats 2384. A fixing post 27 is clamped between the six sets of clamping plates 2391. Its function is: Figure 7 As shown, extending the second hydraulic rod 2388 causes the control plate 2386 to rotate clockwise. At this time, the six sets of movable seats 239 retract, and the six sets of clamping plates 2391 clamp the fixed column 27.

[0053] In this embodiment of the disclosure,

[0054] A fixed cylinder 271 is fixed to the fixed column 27. A top cover 272 is bolted to the upper end of the fixed cylinder 271. An adjusting screw 2721 is mounted on the top cover 272 via a locking ring. A second spring 2722 is mounted on the adjusting screw 2721. A movable column 273 is movably mounted at the lower end of the fixed cylinder 271. A threaded hole is provided at the upper end of the movable column 273. A compression wheel 2731 is bolted to the lower end of the movable column 273. The lower end of the adjusting screw 2721 is threaded into the threaded hole at the upper end of the movable column 273. Its function is: Figure 9 As shown, by rotating the adjusting screw 2721, the movable column 273 can move within the fixed cylinder 271, thereby controlling the pressing depth of the extrusion roller 2731.

[0055] Example 2, based on Example 1,

[0056] A control handle 26 is provided on the circuit breaker body 2. A side plate 3 is bolted to the left end of the circuit breaker body 2. The edge of the side plate 3 has a groove, in which a second transmission belt 313 is installed. A gearbox 31 is bolted to the side plate 3, and a second motor 311 is bolted to the gearbox 31. A pulley is installed on the output shaft of the gearbox 31, and the second transmission belt 313 is fitted onto the pulley on the output shaft of the gearbox 31. An adjusting plate 312 is bolted to the side plate 3. The adjusting plate 312 has a sleeve groove, and a tensioning wheel 3121 is mounted on the adjusting plate 312 via a bearing. The tensioning wheel 3121 presses down on the second transmission belt 313. On the drive belt 313, a rotating arm 32 rotates on the side plate 3. An arc-shaped through groove is provided on the side plate 3, and a connecting block 321 is installed within the arc-shaped through groove. The connecting block 321 is bolted to the rotating arm 32. A connecting seat 322 is bolted to the left side of the rotating arm 32. The connecting seat 322 is fixedly connected to the second drive belt 313, and a threaded rod 325 rotates on the connecting seat 322. A first handwheel 3251 is fixed on the threaded rod 325. A sliding seat 323 slides on the right side of the rotating arm 32. A connecting plate 324 is threaded onto the threaded rod 325. The connecting plate 324 is bolted to the left side of the sliding seat 323. Its function is: Figures 10-12 As shown, running the second motor 311 causes the second transmission belt 313 to drive the rotating arm 32 to rotate, and rotating the first handwheel 3251 causes the threaded rod 325 to rotate, which can adjust the position of the rotating seat 33.

[0057] Example 3, based on Examples 1 and 2,

[0058] A rotating seat 33 is mounted on the right end of the sliding seat 323 via a bearing. A hinge seat 331 is mounted on the rotating seat 33 via bolts. Two sets of clamping plates 332 are hinged to the hinge seat 331. A round rod is fixed to the left end of each set of clamping plates 332. A first seat 3321 slides on the round rod. A second seat 3322 is hinged to the first seat 3321. The right ends of the two sets of clamping plates 332 are in contact with the upper and lower ends of the control handle 26, respectively. Two sets of guide rods 333 are fixed on the rotating seat 33. A movable seat 33 slides on the two sets of guide rods 333. 5. A lead screw 334 is installed between the two sets of guide rods 333 via bearings. The lead screw 334 is threadedly engaged with the movable seat 335. A second handwheel 3341 is fixed on the lead screw 334. A connecting plate 3323 is connected between the movable seat 335 and the second seat 3322, and between the rotating seat 33 and the second seat 3322. Its function is to rotate the second handwheel 3341 to rotate the lead screw 334, so that the movable seat 335 slides on the two sets of guide rods 333, and the clamping tightness of the two sets of clamping plates 332 on the control handle 26 can be adjusted.

[0059] The working principle of this embodiment is as follows: When resetting the circuit breaker, firstly, the first motor 232 is run to drive the first transmission belt 233 to move the L-shaped seat 235 downward, and the first hydraulic rod 2361 is contracted to lower the position of the flipping seat 238. When the flipping seat 238 descends to the corner of the L-shaped slide groove on the U-shaped plate 237, the bracket 236 pulls the flipping seat 238 to move forward and downward. At this time, the front side of the flipping seat 238 flips downward, that is, the flipping seat 238 flips clockwise. At this time, the pressing wheel 2731 can contact the reset button 25 and press it down. Then, the second motor 311 is run to drive the second transmission belt 313 to rotate the rotating arm 32 counterclockwise. Through the two sets of clamping plates 332, the control handle 26 is pulled upward to the conducting position to realize the reset of the circuit breaker.

[0060] Running the No. 1 motor 232 causes the No. 1 transmission belt 233 to drive the L-shaped seat 235 to move upward, and retracting the No. 1 hydraulic rod 2361 causes the flipping seat 238 to flip clockwise, so that the pressing wheel 2731 presses on the test button 24, which can quickly perform a safety test on the circuit breaker.

[0061] The pressing depth of the extrusion wheel 2731 can be controlled by rotating the adjusting screw 2721 to move the movable column 273 within the fixed cylinder 271. Rotating the second handwheel 3341 causes the lead screw 334 to rotate, allowing the moving seat 335 to slide on the two sets of guide rods 333, which can adjust the clamping tightness of the two sets of clamping plates 332 on the control handle 26.

[0062] The following points should be noted in this article:

[0063] 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in a general design.

[0064] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0065] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A quick-acting structure for a circuit breaker, comprising: A rail plate (1); a circuit breaker body (2) is mounted on the rail plate (1), characterized in that a first card holder (21) and a second card holder (22) are fixed at the rear end of the circuit breaker body (2), a locking piece (221) slides on the second card holder (22), a first spring (222) is installed between the locking piece (221) and the second card holder (22), the circuit breaker body (2) is locked on the rail plate (1) by the first card holder (21) and the locking piece (221), a test button (24) and a reset button (25) are provided at the front end of the circuit breaker body (2), and a fixing plate (23) is fixed at the front end of the circuit breaker body (2), a slide rail (231) is installed at the rear end of the fixing plate (23) by bolts, a slider (234) slides on the slide rail (231), and a slider (234) slides on the slider (234). An L-shaped seat (235) is fixed, and a No. 1 motor (232) is installed on the fixed plate (23) by bolts. A pulley is installed on the output shaft of the No. 1 motor (232). A pulley is installed on the lower end of the fixed plate (23) by bearings. A No. 1 transmission belt (233) is connected between the pulley on the output shaft of the No. 1 motor (232) and the pulley at the lower end of the fixed plate (23). The No. 1 transmission belt (233) is fixedly connected to the front end of the L-shaped seat (235). Two sets of rail rods (2351) are fixed on the L-shaped seat (235). Lifting blocks (2352) slide on both sets of rail rods (2351). A bracket (236) is fixed at the rear end of the two sets of lifting blocks (2352). A No. 1 hydraulic rod (2361) is installed between the L-shaped seat (235) and the bracket (236).

2. The quick-acting structure of a circuit breaker according to claim 1, characterized in that, A U-shaped plate (237) is fixed on the L-shaped seat (235). An L-shaped groove is provided on the U-shaped plate (237). A flip seat (238) is installed on the bracket (236). A first shaft (2381), a second shaft (2382), and a third shaft (2383) are fixed on the flip seat (238). The first shaft (2381) is rotatably connected to the bracket (236). The second shaft (2382) moves within the L-shaped groove on the U-shaped plate (237). The third shaft (2383) contacts the upper end of the bracket (236).

3. The quick-acting structure of a circuit breaker according to claim 2, characterized in that, The flip seat (238) is provided with six sets of intermediate seats (2384). Two sets of partition blocks (2385) are installed between the intermediate seats (2384) and the flip seat (238) by bolts. A control plate (2386) is installed between the six sets of intermediate seats (2384) and the flip seat (238). The control plate (2386) is provided with an arc-shaped groove.

4. The quick-acting structure of a circuit breaker according to claim 3, characterized in that, A cylinder seat (2387) is hinged to the flipping seat (238), and a second hydraulic rod (2388) is hinged to the cylinder seat (2387). The piston rod of the second hydraulic rod (2388) is connected to the control plate (2386) through a pin. A movable seat (239) slides between two adjacent intermediate seats (2384). The lower end of the movable seat (239) moves in the arc groove on the control plate (2386). A clamping plate (2391) is installed on the movable seat (239) by bolts. A cover plate (2392) is installed on the upper end of the six intermediate seats (2384) by bolts. A fixing column (27) is clamped between the six clamping plates (2391).

5. The quick-acting structure of a circuit breaker according to claim 4, characterized in that, A fixed cylinder (271) is fixed on the fixed column (27). A top cover (272) is installed on the upper end of the fixed cylinder (271) by bolts. An adjusting screw (2721) is installed on the top cover (272) by a locking ring. A second spring (2722) is installed on the adjusting screw (2721). A movable column (273) is movable at the lower end of the fixed cylinder (271). A threaded hole is provided at the upper end of the movable column (273). A compression wheel (2731) is installed at the lower end of the movable column (273) by bolts. The lower end of the adjusting screw (2721) is threaded into the threaded hole at the upper end of the movable column (273).

6. The quick-acting structure of a circuit breaker according to claim 1, characterized in that, The circuit breaker body (2) is provided with a control handle (26). A side plate (3) is installed on the left end of the circuit breaker body (2) by bolts. A groove is provided on the edge of the side plate (3). A second transmission belt (313) is installed in the groove. A gearbox (31) is installed on the side plate (3) by bolts. A second motor (311) is installed on the gearbox (31) by bolts. A pulley is installed on the output shaft of the gearbox (31). The second transmission belt (313) is sleeved on the pulley on the output shaft of the gearbox (31).

7. The quick-acting structure of a circuit breaker according to claim 6, characterized in that, An adjusting plate (312) is bolted to the side plate (3). The adjusting plate (312) has a sleeve groove. A tensioning wheel (3121) is mounted on the adjusting plate (312) via a bearing. The tensioning wheel (3121) presses down on the second transmission belt (313). A rotating arm (32) rotates on the side plate (3). An arc-shaped through groove is provided on the side plate (3). A connecting block (321) is installed in the arc-shaped through groove. The connecting block (321) is bolted to the rotating arm (32).

8. The quick-acting structure of a circuit breaker according to claim 7, characterized in that, A connecting seat (322) is bolted to the left side of the rotating arm (32). The connecting seat (322) is fixedly connected to the second transmission belt (313). A threaded rod (325) rotates on the connecting seat (322). A handwheel (3251) is fixed on the threaded rod (325). A sliding seat (323) slides on the right side of the rotating arm (32). A connecting plate (324) is threaded on the threaded rod (325). The connecting plate (324) is bolted to the left side of the sliding seat (323).

9. The quick-acting structure of a circuit breaker according to claim 8, characterized in that, The right end of the sliding seat (323) is equipped with a rotating seat (33) via a bearing. A hinge seat (331) is installed on the rotating seat (33) via bolts. Two sets of clamping plates (332) are hinged on the hinge seat (331). A round rod is fixed to the left end of each of the two sets of clamping plates (332). A first seat (3321) slides on the round rod. A second seat (3322) is hinged on the first seat (3321). The right ends of the two sets of clamping plates (332) are in contact with the upper and lower ends of the control handle (26), respectively.

10. The quick-acting structure of a circuit breaker according to claim 9, characterized in that, Two sets of guide rods (333) are fixed on the rotating seat (33), and a movable seat (335) slides on the two sets of guide rods (333). A lead screw (334) is installed between the two sets of guide rods (333) through a bearing. The lead screw (334) is threadedly engaged with the movable seat (335). A second handwheel (3341) is fixed on the lead screw (334). A connecting plate (3323) is connected between the movable seat (335) and the second seat (3322), and between the rotating seat (33) and the second seat (3322).

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