Auxiliary ventilation equipment and method for SF6 circuit breaker maintenance

Abstract

The invention relates to auxiliary ventilation equipment and method for SF6 circuit breaker maintenance, and belongs to the technical field of SF6 circuit breaker maintenance. According to the technical scheme, the SF6 circuit breaker is placed on the lifting assembly, and the lifting assembly is used for lifting the corresponding SF6 circuit breaker; the center of the first bearing frame is provided with a rotating shaft, the top of the rotating shaft is provided with a second bearing frame, the second bearing frame is divided into an upper layer plate and a lower layer plate, two sides of the lower layer plate of the second bearing frame are respectively provided with second grooves which are symmetrically arranged, a group of clamping assemblies is arranged beside each second groove, and the clamping assemblies are used for clamping the outer wall of the arc extinguishing chamber after the corresponding SF6 circuit breaker is lifted; third grooves are symmetrically formed in the two sides of the upper layer plate of the second bearing frame. The first clamping cylinder and the second clamping cylinder are connected with the top of the arc extinguish chamber after the corresponding SF6 circuit breaker is lifted in a clamped mode. While the personnel safety is guaranteed, the ventilation purity and the maintenance efficiency are improved, the operation risk is reduced, and the ventilation quality is guaranteed.

Description

Technical Field

[0001] This invention relates to an auxiliary ventilation device and method for SF6 circuit breaker maintenance, belonging to the field of SF6 circuit breaker maintenance technology. Background Technology

[0002] SF6 gas is widely used in high-voltage circuit breakers (SF6 circuit breakers) due to its excellent insulation and arc-extinguishing properties. However, during the regular maintenance, repair, or troubleshooting of circuit breakers, it is often necessary to completely purge the SF6 gas inside and replace it with fresh gas or dry air. This gas exchange process is a critical step and a safety prerequisite for maintenance operations, as the old gas may contain toxic decomposition products generated during operation or have excessive moisture content, threatening personnel health and equipment safety. Existing gas exchange methods mainly rely on natural gas diffusion or simple vacuuming / charging operations, which are passive and time-consuming. On the one hand, because the density of SF6 gas is much greater than that of air, the efficiency of natural venting or replacement is extremely low, resulting in a significant extension of the maintenance window and seriously affecting equipment availability. On the other hand, during the operation, maintenance personnel need to manually connect / disconnect the charging / draining pipelines multiple times, repeatedly open and close valves, and be exposed to the vicinity of the equipment for extended periods. This not only involves high labor intensity but also increases the risk of personnel being directly exposed to high concentrations of SF6 gas or its harmful decomposition products due to operational errors (such as valve leaks or pipeline detachment), posing serious safety hazards such as asphyxiation and poisoning. Meanwhile, inefficient ventilation may also result in residual harmful gases or air in the gas chamber, affecting the purity of newly introduced SF6 gas and the performance of the equipment.

[0003] Chinese patent applications CN201721505223, entitled "An Intelligent SF6 High-Voltage Circuit Breaker for Dehumidification and Gas Replenishment," and CN201811477835, entitled "An Automatic SF6 Gas Refilling System and Method for GIS Equipment," aim to reduce maintenance costs and labor intensity, and improve work efficiency and operational safety through intelligent processing. However, they do not solve the problem of positioning and clamping the arc-extinguishing chamber of the SF6 circuit breaker, which introduces operational risks to the handling of the SF6 circuit breaker; they also do not solve how to accurately connect the extraction gun and the filling gun to the arc-extinguishing chamber interface, do not eliminate the possibility of personnel coming into close contact with harmful gases, and do not create a closed and continuous operating environment, thus failing to fundamentally eliminate the risk of SF6 gas leakage or exposure to toxic decomposition products.

[0004] In summary, the main drawbacks of existing SF6 circuit breaker maintenance ventilation technology are low efficiency and high safety risks. There is a lack of dedicated auxiliary equipment capable of proactively, quickly, and thoroughly replacing the gas inside the circuit breaker while minimizing direct human intervention and exposure time. Summary of the Invention

[0005] This invention proposes an auxiliary ventilation device and method for SF6 circuit breaker maintenance. It fully replaces the high-risk manual operation mode with mechanical automation, which greatly ensures personnel safety, significantly improves ventilation purity and maintenance efficiency, and reduces the probability of equipment damage caused by human error. It safely and efficiently completes the process of SF6 gas discharge, purification (if necessary), and fresh gas / air filling, reduces operational risks, and ensures ventilation quality. It meets the strict requirements of modern power systems for equipment maintenance safety and speed, and solves the above-mentioned technical problems existing in the prior art.

[0006] The technical solution of this invention is: An auxiliary ventilation device for SF6 circuit breaker maintenance includes a platform, a first support frame, a lifting assembly, a rotating shaft, a second support frame, a clamping assembly, a first clamping sleeve, a second clamping sleeve, a three-dimensional moving mechanism, a power mechanism, an air extraction gun, and an air filling gun. The first support frame is fixedly installed inside the platform. Symmetrically arranged first grooves are formed on both sides of the first support frame, and two lifting assemblies are respectively arranged in the two first grooves. An SF6 circuit breaker is placed on the lifting assembly, which is used to lift the corresponding SF6 circuit breaker. A rotating shaft is located at the center of the first support frame, and a second support frame is installed on the top of the rotating shaft. The rotating shaft drives the second support frame to rotate under the drive of a power mechanism. The second support frame is divided into upper and lower plates. Symmetrically arranged second grooves are formed on both sides of the lower plate of the second support frame. A set of clamping assemblies is provided next to each second groove, which is used to clamp the outer wall of the arc-extinguishing chamber after the corresponding SF6 circuit breaker is lifted. Symmetrically arranged third grooves are formed on both sides of the upper plate of the second support frame. A first clamping sleeve and a second clamping sleeve are respectively installed in the two third grooves, and both the first and second clamping sleeves are engaged with the top of the arc-extinguishing chamber after the corresponding SF6 circuit breaker is lifted. A loading plate is fixedly installed on the top of the platform. A first mounting seat and a second mounting seat arranged left and right are mounted on the loading plate. A three-dimensional moving mechanism is installed on both the first and second mounting seats. The three-dimensional moving mechanism includes an X-axis moving component, a Y-axis moving component, and a Z-axis moving component. An extraction gun is installed on the Z-axis moving component corresponding to the first mounting seat, and an inflation gun is installed on the Z-axis moving component corresponding to the second mounting seat. The extraction gun is used to extract SF6 gas into the arc-extinguishing chamber of the corresponding SF6 circuit breaker, and the inflation gun is used to fill the arc-extinguishing chamber of the corresponding SF6 circuit breaker with SF6 gas. The loading plate has a through slot to facilitate the passage of the extraction gun and the inflation gun. The extraction gun and the inflation gun move to the upper end of the first and second clamps through their respective three-dimensional moving mechanisms and are matched and connected to the gas nozzle interface of the SF6 circuit breaker.

[0007] Furthermore, the lifting assembly includes a fixed platform, which is fastened to a first support frame. A first cylinder is mounted on the fixed platform, with the piston rod of the first cylinder arranged upward along the Z-axis. A lifting plate is fixedly mounted at the end of the piston rod of the first cylinder, and a stabilizing frame is fixedly mounted at the bottom of the lifting plate. A guide rail mounting seat is provided on the side of the fixed platform, and a first guide rail arranged along the Z-axis is fixedly mounted on the guide rail mounting seat. A first slider is slidably mounted on the first guide rail, and the first slider is fastened to the stabilizing frame. The SF6 circuit breaker is placed on the lifting plate of the lifting assembly.

[0008] Furthermore, a positioning mechanism is provided between the guide rail mounting base and the stabilizer frame to position the lifting plate on the stabilizer frame.

[0009] Furthermore, the positioning mechanism includes a second cylinder, which is mounted on the side of the guide rail mounting base. The piston rod of the second cylinder is arranged along the Y-axis direction and connected to a square plate. Multiple cylinders arranged linearly along the Z-axis direction are fixed on the side of the stabilizer. A locking block is fixedly mounted on the square plate, and the locking block matches between two adjacent cylinders to position the lifting plate on the stabilizer.

[0010] Furthermore, the power mechanism includes a first servo motor, which is disposed within a first support frame. The output shaft of the first servo motor is arranged above the first support frame. A first turntable is mounted on the shaft, and a second turntable is mounted on the output shaft of the first servo motor. The first turntable and the second turntable are connected by a transmission belt, and the first servo motor drives the shaft to rotate.

[0011] Furthermore, the clamping assembly includes two third cylinders symmetrically arranged on the two side walls of the second groove. The piston rods of the third cylinders are arranged along the Y-axis. A concave plate is installed at the end of the piston rod of the third cylinder. The inner edge of the concave plate is an arc surface structure. The arc surface structure contacts and clamps the outer wall of the arc-extinguishing chamber of the SF6 circuit breaker after lifting.

[0012] Furthermore, the third groove is a double-layer slot structure, with a through hole at the bottom and a groove of arbitrary shape at the top. The maximum length of the groove is greater than the diameter of the through hole at the bottom. The outer walls of the first and second clamping cylinders are provided with sleeve plates that match the groove. The sleeve plates are installed in the groove at the top of the third groove and fastened with bolts to position the first and second clamping cylinders in their respective third grooves.

[0013] Further, the Y-axis moving assembly includes a Y-axis moving base, a first lead screw guide rail, and a second servo motor. The first and second mounting bases respectively mount corresponding first lead screw guide rails. The first lead screw guide rails are arranged along the Y-axis direction. A second servo motor for driving is mounted on the side of the first lead screw guide rail. The Y-axis moving base is slidably engaged with the first lead screw guide rail. The X-axis moving assembly includes an X-axis moving base, a second lead screw guide rail, and a third servo motor. The second lead screw guide rail is mounted on the side of the Y-axis moving base. The second lead screw guide rail is arranged along the X-axis direction. A third servo motor for driving is mounted on the side of the second lead screw guide rail. The X-axis moving base is slidably engaged with the second lead screw guide rail. The Z-axis moving assembly includes a Z-axis moving base, a third lead screw guide rail, and a fourth servo motor. The third lead screw guide rail is fixedly mounted on the side of the X-axis moving base. The third lead screw guide rail is arranged along the Z-axis direction. A fourth servo motor for driving is mounted on the side of the third lead screw guide rail. The side of the third lead screw guide rail is slidably engaged with the Z-axis moving base.

[0014] Furthermore, a right-angle bracket is installed on the Z-axis moving seat, a reference ring is installed at the bottom of the right-angle bracket, and a leak-proof cover is fitted at the bottom of the reference ring. The leak-proof cover has an inverted funnel-shaped structure, and the air extraction gun and the air inflation gun are arranged inside their respective leak-proof covers.

[0015] A ventilation method for SF6 circuit breakers, using the aforementioned auxiliary ventilation equipment for SF6 circuit breaker maintenance, comprises the following steps: Step 1) The lifting components located on both sides of the first support frame are respectively the air extraction station and the air filling station; place the two SF6 circuit breakers that need to be ventilated on the lifting components of the air extraction station and the air filling station respectively. Step 2) The lifting components of the extraction station and the charging station lift the corresponding SF6 circuit breakers respectively. The two SF6 circuit breakers enter the second grooves on both sides of the second support frame respectively. The outer walls of the arc-extinguishing chambers of the two SF6 circuit breakers are clamped by the clamping components of the corresponding group. The first clamp and the second clamp are respectively engaged with the top of the arc-extinguishing chamber of the SF6 circuit breaker in the extraction station and the charging station. Step 3) The extraction gun moves to the SF6 circuit breaker at the extraction station via the corresponding three-dimensional moving mechanism and connects to the gas nozzle interface of the SF6 circuit breaker to extract the gas from the SF6 circuit breaker. After the SF6 circuit breaker completes the extraction, the extraction gun moves out and resets. Step 4) The power mechanism drives the rotating shaft to rotate the second support frame together with the first and second clamps by 180 degrees. The positions of the two SF6 circuit breakers on the second support frame are switched. The SF6 circuit breaker after being evacuated is switched to the charging position. The charging gun moves to the SF6 circuit breaker at the charging position through the corresponding three-dimensional moving mechanism and connects to the gas nozzle interface of the SF6 circuit breaker to charge fresh SF6 gas into the SF6 circuit breaker. At the same time, the evacuation gun moves to the SF6 circuit breaker at the evacuation position through the corresponding three-dimensional moving mechanism and connects to the gas nozzle interface of the SF6 circuit breaker to extract the gas from the SF6 circuit breaker. Step 5) After the SF6 circuit breaker at the inflation station is fully inflated, the inflation gun is reset, the clamping assembly releases the SF6 circuit breaker, the lifting assembly descends and resets, and the SF6 circuit breaker is released from the first clamp by gravity and descends with the lifting assembly. The SF6 circuit breaker is removed through the first groove on the first support frame, and a new SF6 circuit breaker that needs to be ventilated is placed. The lifting assembly lifts the new SF6 circuit breaker, and the clamping assembly clamps the outer wall of the arc-extinguishing chamber of the SF6 circuit breaker. After the SF6 circuit breaker at the extraction station is ventilated, the extraction gun is removed and reset. Steps 4) and 5) are repeated to complete the ventilation of the SF6 circuit breaker.

[0016] This invention significantly improves the efficiency and safety of SF6 circuit breaker maintenance and ventilation through integrated mechanical structure and automated operation. Firstly, the equipment adopts a modular collaborative design: the lifting and clamping components, in conjunction with the first and second clamps, achieve rapid positioning and stable clamping of the circuit breaker's arc-extinguishing chamber, avoiding the risks of manual handling. Secondly, it features a unique three-axis linkage ventilation system (three-dimensional moving mechanism): through the precise coordination of the X-axis, Y-axis, and Z-axis moving components, the extraction and filling guns are automatically aligned with the arc-extinguishing chamber's gas nozzle interface, accurately completing gas replacement and significantly reducing operation time (to less than 1 / 3 of traditional manual operation), without requiring personnel to be in close contact with harmful gases throughout the process. Thirdly, an integrated safety protection mechanism: the rotating shaft drives the second support frame to rotate, combined with the through-slot of the loading plate guiding the gun body's movement, ensuring a sealed and continuous ventilation process and completely eliminating the risk of SF6 leakage or exposure of decomposition products. This invention replaces high-risk manual operations with mechanical automation, which not only ensures personnel safety but also improves air purity and maintenance efficiency. At the same time, it reduces the probability of equipment damage caused by operational errors, providing a highly reliable solution for power system operation and maintenance. Therefore, it has a very broad application prospect.

[0017] The beneficial technical effects of this invention are as follows: It completely replaces the high-risk manual operation mode with mechanical automation, which greatly ensures the safety of personnel, significantly improves the purity of air exchange and maintenance efficiency, and reduces the probability of equipment damage caused by human operation errors. It safely and efficiently completes the discharge, purification (if necessary) and filling of fresh gas / air of SF6 gas, reduces operational risks, ensures air exchange quality, and meets the strict requirements of modern power systems for the safety and speed of equipment maintenance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the installation structure of a single three-dimensional moving mechanism according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the lifting component structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the three-dimensional moving mechanism structure on the first mounting base according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the three-dimensional moving mechanism structure on the second mounting base according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the internal structure of the test bench according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the first support frame installation structure according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the second support frame installation structure according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the second and third groove structures according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the first cassette and triangular sleeve structure according to an embodiment of the present invention; In the diagram: 1. Platform; 2. First support frame; 3. Lifting assembly; 301. Fixed platform; 302. First cylinder; 303. Lifting plate; 304. Stabilizer; 305. First guide rail; 306. Guide rail mounting seat; 307. Second cylinder; 308. Square plate; 309. Cylindrical plate; 310. Clamping block; 311. Positioning post; 4. Rotary shaft; 401. Turntable; 5. Second support frame; 6. Clamping assembly; 601. Third cylinder; 602. Concave plate; 7. First clamping sleeve; 8. Second clamping sleeve; 9. Loading plate; 10. First mounting seat; 11. Second mounting seat; 12. Three-dimensional moving mechanism; 1201. Y-axis moving seat; 1201. X-axis moving seat. 2. Z-axis moving seat 1203, first lead screw guide rail 1204, second lead screw guide rail 1205, third lead screw guide rail 1206, second servo motor 1207, third servo motor 1208, fourth servo motor 1209, power mechanism 13, first servo motor 1301, first turntable 1302, second turntable 1303, transmission belt 1304, air extraction gun 14, air inflation gun 15, through groove 16, first groove 17, second groove 18, third groove 19, triangular sleeve plate 20, right angle bracket 21, reference ring 22, anti-leakage cover 23, universal wheel 24, foot 25. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] See attached document Figure 1-10 An auxiliary ventilation device for SF6 circuit breaker maintenance includes a platform 1, a first support frame 2, a lifting assembly 3, a rotating shaft 4, a second support frame 5, a clamping assembly 6, a first clamping cylinder 7, a second clamping cylinder 8, a three-dimensional moving mechanism 12, a power mechanism 13, an air extraction gun 14, and an air filling gun 15. The platform 1 is a rectangular frame structure, with a first support frame 2 fixedly installed inside. Symmetrically arranged first grooves 17 are formed on the left and right sides of the first support frame 2, and two lifting components 3 are respectively arranged within the two first grooves 17. An SF6 circuit breaker is placed on the lifting component 3, which is used to lift the corresponding SF6 circuit breaker. A rotating shaft 4 is located at the center of the first support frame 2, and a second support frame 5 is mounted on the top of the rotating shaft 4. The rotating shaft 4 drives the second support frame 5 to rotate under the drive of the power mechanism 13. The second support frame 5 consists of upper and lower plates. The upper and lower plates are connected by multiple supporting columns. The lower plate of the second support frame 5 has symmetrically arranged second grooves 18 on both sides. Each second groove 18 is provided with a set of clamping components 6. The clamping components 6 are used to clamp the outer wall of the arc-extinguishing chamber after the corresponding SF6 circuit breaker is lifted. The upper plate of the second support frame 5 has symmetrically arranged third grooves 19 on both sides. The first clamping cylinder 7 and the second clamping cylinder 8 are respectively installed in the two third grooves 19. The first clamping cylinder 7 and the second clamping cylinder 8 are engaged with the top of the arc-extinguishing chamber after the corresponding SF6 circuit breaker is lifted. A loading plate 9 is fixedly installed on the top of the platform 1. A first mounting seat 10 and a second mounting seat 11 arranged left and right are mounted on the loading plate 9. A three-dimensional moving mechanism 12 is installed on both the first mounting seat 10 and the second mounting seat 11. The three-dimensional moving mechanism 12 includes an X-axis moving component, a Y-axis moving component and a Z-axis moving component. An air extraction gun 14 is installed on the Z-axis moving component corresponding to the first mounting seat 10, and an air inflation gun 15 is installed on the Z-axis moving component corresponding to the second mounting seat 11. The X-axis moving component, the Y-axis moving component and the Z-axis moving component are respectively used for moving the air extraction gun 14 and the air inflation gun 15 in the X-axis direction, the Y-axis direction and the Z-axis direction. The extraction gun 14 is used to extract SF6 gas into the arc-extinguishing chamber of the corresponding SF6 circuit breaker, and the charging gun 15 is used to charge SF6 gas into the arc-extinguishing chamber of the corresponding SF6 circuit breaker. The loading plate 9 is provided with a through slot 16 to facilitate the passage of the extraction gun 14 and the charging gun 15. The extraction gun 14 and the charging gun 15 are moved to the upper end of the first clamping cylinder 7 and the second clamping cylinder 8 through their respective three-dimensional moving mechanisms 12 and are matched and connected to the gas nozzle interface of the SF6 circuit breaker.

[0021] Preferably, the top of the rotating shaft 4 is provided with a turntable 401, which is connected to the lower plate of the second support frame 5 to increase stability.

[0022] See attached document Figure 1 and 2 In this embodiment, support legs are installed at the four corners of the bottom of the platform 1. The sides of the support legs are provided with casters 24 and the bottom of the support legs are provided with feet 25. After the feet 25 are installed, the casters 24 do not contact the ground. When it is necessary to move, the feet 25 can be removed and the auxiliary ventilation device can be moved.

[0023] See attached document Figure 3 In this embodiment, the lifting assembly 3 includes a fixed platform 301, which is fastened to the first support frame 2. A first cylinder 302 is installed on the fixed platform 301. The piston rod of the first cylinder 302 is arranged upward along the Z-axis. A lifting plate 303 is fixedly installed at the end of the piston rod of the first cylinder 302. A plurality of positioning posts 311 are provided on the top of the lifting plate 303. The positioning posts 311 match the positioning grooves on the bottom base of the SF6 circuit breaker.

[0024] A stabilizing frame 304 is fixedly installed at the bottom of the lifting plate 303. A guide rail mounting seat 306 is provided on the side of the fixed platform 301. A first guide rail 305 arranged along the Z-axis is fixedly installed on the guide rail mounting seat 306. A first slider is slidably installed on the first guide rail 305. The first slider is fastened to the stabilizing frame 304. The SF6 circuit breaker is placed on the lifting plate 303 of the lifting assembly 3.

[0025] A positioning mechanism is provided between the guide rail mounting base 306 and the stabilizer 304. The positioning mechanism positions the lifting plate 303 on the stabilizer 304. The positioning mechanism is a commonly known and common mechanism in the art. A specific embodiment is as follows.

[0026] Example 1: The positioning mechanism includes a second cylinder 307. The second cylinder 307 is mounted on the side of the guide rail mounting base 306. The piston rod of the second cylinder 307 is arranged along the Y-axis direction. The piston rod of the second cylinder 307 is connected to the square plate 308. A plurality of cylinders 309 arranged linearly along the Z-axis direction are fixed on the side of the stabilizer 304. A locking block 310 is fixedly installed on the square plate 308. The locking block 310 is matched between two adjacent cylinders 309 to position the lifting plate 303 on the stabilizer 304.

[0027] Preferably, the locking block 310 has a conical locking head, which is inserted between two adjacent cylinders 309. The conical structure of the locking head facilitates entry between two adjacent cylinders 309.

[0028] Example 2: The back of the stabilizer 304 is fixed with a plurality of circular holes arranged linearly along the Z-axis. The locking block is cylindrical and there is at least one. The cylindrical locking block is inserted into the circular hole to position the lifting plate 303 on the stabilizer 304. The rest of the mechanism is the same as in Example 1, and will not be described in detail here.

[0029] Example 3: The positioning mechanism includes a servo motor and a positioning rod / block. The output end of the servo motor pushes the positioning rod / block into the circular hole on the stabilizer 304 or between two adjacent cylinders 309 through a transmission component to position the lifting plate 303 on the stabilizer 304.

[0030] See attached document Figure 6 and 7 The power mechanism 13 includes a first servo motor 1301, which is installed inside the first support frame 2. The output shaft of the first servo motor 1301 is connected to the rotating shaft 4 via the power mechanism 13, and the first servo motor 1301 drives the rotating shaft 4 to rotate. The power mechanism 13 is a commonly known and common mechanism in the art, and a specific embodiment is as follows.

[0031] Example 1: A first servo motor 1301 is installed inside the first support frame 2. The output shaft of the first servo motor 1301 is arranged above the first support frame 2. A first turntable 1302 is mounted on the rotating shaft 4, and a second turntable 1303 is mounted on the output shaft of the first servo motor 1301. The first turntable 1302 and the second turntable 1303 are connected by a transmission belt 1304. The first servo motor 1301 drives the rotating shaft 4 to rotate. The outer diameter of the first turntable 1302 is smaller than the outer diameter of the second turntable 1303.

[0032] Example 2: A first servo motor 1301 is installed inside the first support frame 2. The output shaft of the first servo motor 1301 is arranged above the first support frame 2. A small gear is provided on the output shaft of the first servo motor 1301. A large gear is installed on the rotating shaft 4 through a bearing. The large gear meshes with the small gear. The first servo motor 1301 drives the rotating shaft 4 to rotate.

[0033] See attached document Figure 8 The clamping assembly 6 includes two third cylinders 601 symmetrically arranged on the front and rear side walls of the second groove 18. The piston rods of the third cylinders 601 are arranged along the Y-axis. A concave plate 602 is installed at the end of the piston rod of the third cylinder 601. The inner edge of the concave plate 602 is an arc surface structure. The arc surface structure contacts and clamps the outer wall of the arc extinguishing chamber of the SF6 circuit breaker after lifting.

[0034] Preferably, the inner side of the concave plate 602 is provided with an elastic anti-slip pad to avoid damage to the outer wall of the arc extinguishing chamber and prevent the SF6 circuit breaker from sliding.

[0035] See attached document Figure 9 The third groove 19 has a double-layer slot structure, with a through hole at the bottom and a groove of arbitrary shape at the top. The longest length of the groove is greater than the diameter of the through hole at the bottom, so that the sleeve can be stuck on the bottom of the groove. The outer walls of the first clamping cylinder 7 and the second clamping cylinder 8 are provided with sleeves that match the groove. After the first clamping cylinder 7 and the second clamping cylinder 8 pass through the through hole at the bottom of the third groove 19, the sleeves are adapted to the groove at the top of the third groove 19, positioning the first clamping cylinder 7 and the second clamping cylinder 8 in their respective third grooves 19.

[0036] The first clamping cylinder 7 and the second clamping cylinder 8 have the same structure, both being circular cylindrical structures with an open bottom and a sleeve plate, and an annular plate at the top. The bottom of the leak-proof cover 23 is clamped onto the annular plate.

[0037] Example 1: The third groove 19 has a double-layer slot structure, with a round through hole at the bottom and a triangular groove at the top. The outer walls of the first clamping cylinder 7 and the second clamping cylinder 8 are provided with triangular sleeve plates 20. The diameter of the round through hole at the bottom of the third groove 19 is the same as the inner diameter of the first clamping cylinder 7 and the second clamping cylinder 8. The triangular sleeve plates 20 are installed in the triangular groove at the top of the third groove 19 and fixed with bolts, thereby positioning the first clamping cylinder 7 and the second clamping cylinder 8 in their respective third grooves 19.

[0038] Example 2: The third groove 19 has a double-layer groove structure, with a through hole at the bottom and a circular groove at the top. The outer walls of the first clamping cylinder 7 and the second clamping cylinder 8 are provided with annular sleeve plates. The annular sleeve plates are installed in the circular groove at the top of the third groove 19 and are fastened with bolts.

[0039] See attached document Figure 4 and 5 The Y-axis moving assembly includes a Y-axis moving base 1201, a first lead screw guide rail 1204, and a second servo motor 1207. The first mounting base 10 and the second mounting base 11 respectively mount the corresponding first lead screw guide rail 1204. The first lead screw guide rail 1204 is arranged along the Y-axis direction. The side of the first lead screw guide rail 1204 is mounted with the second servo motor 1207 for driving. The Y-axis moving base 1201 is slidably engaged with the first lead screw guide rail 1204. The X-axis moving assembly includes an X-axis moving base 1202, a second lead screw guide rail 1205, and a third servo motor 1208. The side of the Y-axis moving base 1201 is mounted with the second lead screw guide rail 1205. The lead screw guide 1205 is arranged along the X-axis direction. A third servo motor 1208 for driving is mounted on the side of the second lead screw guide 1205. The X-axis moving seat 1202 is slidably engaged with the second lead screw guide 1205. The Z-axis moving assembly includes a Z-axis moving seat 1203, a third lead screw guide 1206, and a fourth servo motor 1209. The third lead screw guide 1206 is fixedly mounted on the side of the X-axis moving seat 1202. The third lead screw guide 1206 is arranged along the Z-axis direction. The fourth servo motor 1209 for driving is mounted on the side of the third lead screw guide 1206. The side of the third lead screw guide 1206 is fastened to the Z-axis moving seat 1203.

[0040] Preferably, a right-angle bracket 21 is installed on the Z-axis moving seat 1203, a reference ring 22 is installed at the bottom of the right-angle bracket 21, and a leak-proof cover 23 is fitted at the bottom of the reference ring 22. The leak-proof cover 23 has an inverted funnel-shaped structure, and the air extraction gun 14 and the air inflation gun 15 are arranged inside their respective leak-proof covers 23.

[0041] In this embodiment, the first lead screw guide rail 1204 includes a guide rail and a lead screw. A second servo motor 1207 is provided on the side of the guide rail. The output end of the second servo motor 1207 is driven to one end of the lead screw through a coupling. The other end of the lead screw is rotatably connected to a bracket on the side of the guide rail. The Y-axis moving seat 1201 is threadedly connected to the lead screw. The bottom surface of the Y-axis moving seat 1201 is slidably disposed on the guide rail. The second servo motor 1207 drives the lead screw to rotate, and the Y-axis moving seat 1201 moves along the guide rail from the Y-axis direction.

[0042] In this embodiment, the second lead screw guide rail 1205 includes a second guide rail and a second lead screw. A third servo motor 1208 is provided on the side of the second guide rail. The output end of the third servo motor 1208 is driven and connected to one end of the second lead screw through a coupling. The other end of the second lead screw is rotatably connected to a second bracket on the side of the second guide rail. The bottom surface of the X-axis moving seat 1202 is slidably disposed on the second guide rail. The third servo motor 1208 drives the second lead screw to rotate, and the X-axis moving seat 1202 moves along the second guide rail from the X-axis direction.

[0043] In this embodiment, the third lead screw guide rail 1206 includes a guide rail three and a lead screw three. A fourth servo motor 1209 is provided on the side of the guide rail three. The output end of the fourth servo motor 1209 is driven and connected to one end of the lead screw three through a coupling. The other end of the lead screw three is rotatably connected to the bracket three on the side of the guide rail three. The bottom surface of the Z-axis moving seat 1203 is slidably disposed on the guide rail three. The fourth servo motor 1209 drives the lead screw three to rotate, and the Z-axis moving seat 1203 moves along the guide rail three from the Z-axis direction.

[0044] A ventilation method for SF6 circuit breakers, using the aforementioned auxiliary ventilation equipment for SF6 circuit breaker maintenance, comprises the following steps: Step 1) The lifting components 3 located on both sides of the first support frame 2 are respectively the air extraction station and the air filling station; place the two SF6 circuit breakers that need to be ventilated on the lifting components 3 of the air extraction station and the air filling station respectively. Step 2) The lifting components 3 of the extraction station and the charging station respectively lift the corresponding SF6 circuit breaker. The two SF6 circuit breakers enter the second grooves 18 on both sides of the second support frame 5 respectively. The outer walls of the arc-extinguishing chambers of the two SF6 circuit breakers are clamped by the corresponding clamping components 6. The first clamping sleeve 7 and the second clamping sleeve 8 are respectively engaged with the top of the arc-extinguishing chamber of the SF6 circuit breaker in the extraction station and the charging station. Step 3) The extraction gun 14 moves to the SF6 circuit breaker at the extraction station via the corresponding three-dimensional moving mechanism 12 and connects to the gas nozzle interface of the SF6 circuit breaker to extract the gas from the SF6 circuit breaker. After the SF6 circuit breaker completes the extraction, the extraction gun 14 moves out and resets. Step 4) The power mechanism 13 drives the rotating shaft 4 to rotate the second support frame 5 together with the first clamp 7 and the second clamp 8 by 180 degrees. The positions of the two SF6 circuit breakers on the second support frame 5 are switched. The SF6 circuit breaker after being evacuated is switched to the gas filling position. The gas filling gun 15 moves to the SF6 circuit breaker at the gas filling position through the corresponding three-dimensional moving mechanism 12 and connects to the gas nozzle interface of the SF6 circuit breaker to fill the SF6 circuit breaker with fresh SF6 gas. At the same time, the gas extraction gun 14 moves to the SF6 circuit breaker at the gas extraction position through the corresponding three-dimensional moving mechanism 12 and connects to the gas nozzle interface of the SF6 circuit breaker to extract the gas from the SF6 circuit breaker. Step 5) After the SF6 circuit breaker at the inflation station is fully inflated, the inflation gun 15 resets, the clamping assembly 6 releases the SF6 circuit breaker, the lifting assembly 3 descends and resets, and the SF6 circuit breaker is released from the first clamp 7 by gravity and descends with the lifting assembly 3. The SF6 circuit breaker is removed through the first groove 17 on the first support frame 2, and a new SF6 circuit breaker that needs to be ventilated is placed. The lifting assembly 3 lifts the new SF6 circuit breaker, and the clamping assembly 6 clamps the outer wall of the arc-extinguishing chamber of the SF6 circuit breaker. After the SF6 circuit breaker at the extraction station is ventilated, the extraction gun 14 is removed and resets. Steps 4) and 5) are repeated to complete the ventilation of the SF6 circuit breaker.

[0045] This invention uses a rotating shaft 4 to switch work positions, enabling the simultaneous evacuation and charging of two SF6 circuit breakers, thus improving efficiency.

[0046] The above description is merely the basic principle and preferred embodiment of the present invention. Improvements and substitutions made by those skilled in the art based on the present invention are within the scope of protection of the present invention.

Claims

1. An auxiliary ventilation device for SF6 circuit breaker maintenance, characterized in that: It includes a platform (1), a first support frame (2), a lifting assembly (3), a rotating shaft (4), a second support frame (5), a clamping assembly (6), a first clamp (7), a second clamp (8), a three-dimensional moving mechanism (12), a power mechanism (13), an air extraction gun (14), and an air inflation gun (15). The first support frame (2) is fixedly installed inside the frame (1). The first support frame (2) has symmetrically arranged first grooves (17) on both sides. Two lifting components (3) are arranged in the two first grooves (17). The SF6 circuit breaker is placed on the lifting component (3). The lifting component (3) is used to lift the corresponding SF6 circuit breaker. The first support frame (2) has a rotating shaft (4) at its center. The top of the rotating shaft (4) is equipped with a second support frame (5). The rotating shaft (4) drives the second support frame (5) to rotate under the drive of the power mechanism (13). The second support frame (5) The second support frame (5) is divided into upper and lower plates. The lower plate of the second support frame (5) has symmetrically arranged second grooves (18) on both sides. Each second groove (18) is provided with a set of clamping components (6). The clamping components (6) are used to clamp the outer wall of the arc-extinguishing chamber after the corresponding SF6 circuit breaker is lifted. The upper plate of the second support frame (5) has symmetrically arranged third grooves (19) on both sides. The first clamping sleeve (7) and the second clamping sleeve (8) are respectively installed in the two third grooves (19). The first clamping sleeve (7) and the second clamping sleeve (8) are both engaged with the top of the arc-extinguishing chamber after the corresponding SF6 circuit breaker is lifted. The top of the platform (1) is fixedly installed with a loading plate (9), and a first mounting seat (10) and a second mounting seat (11) arranged on the left and right are installed on the loading plate (9). A three-dimensional moving mechanism (12) is installed on both the first mounting seat (10) and the second mounting seat (11). The three-dimensional moving mechanism (12) includes an X-axis moving component, a Y-axis moving component and a Z-axis moving component. A vacuum gun (14) is installed on the Z-axis moving component corresponding to the first mounting base (10), and a charging gun (15) is installed on the Z-axis moving component corresponding to the second mounting base (11). The vacuum gun (14) is used to extract SF6 gas into the arc-extinguishing chamber of the corresponding SF6 circuit breaker, and the charging gun (15) is used to charge SF6 gas into the arc-extinguishing chamber of the corresponding SF6 circuit breaker. A through slot (16) is provided on the loading plate (9) to facilitate the passage of the vacuum gun (14) and the charging gun (15). The vacuum gun (14) and the charging gun (15) move to the upper end of the first clamp (7) and the second clamp (8) through their respective three-dimensional moving mechanisms and are matched and connected to the gas nozzle interface of the SF6 circuit breaker.

2. The auxiliary ventilation device for SF6 circuit breaker maintenance according to claim 1, characterized in that: The lifting assembly (3) includes a fixed platform (301), which is fastened to the first support frame (2). A first cylinder (302) is installed on the fixed platform (301). The piston rod of the first cylinder (302) is arranged upward along the Z-axis. A lifting plate (303) is fixedly installed at the end of the piston rod of the first cylinder (302). A stabilizing frame (304) is fixedly installed at the bottom of the lifting plate (303). A guide rail mounting seat (306) is provided on the side of the fixed platform (301). A first guide rail (305) arranged along the Z-axis is fixedly installed on the guide rail mounting seat (306). A first slider is slidably installed on the first guide rail (305). The first slider is fastened to the stabilizing frame (304). The SF6 circuit breaker is placed on the lifting plate (303) of the lifting assembly (3).

3. The auxiliary ventilation device for SF6 circuit breaker maintenance according to claim 2, characterized in that: A positioning mechanism is provided between the guide rail mounting base (306) and the stabilizer (304) to position the lifting plate (303) on the stabilizer (304).

4. The auxiliary ventilation device for SF6 circuit breaker maintenance according to claim 3, characterized in that: The positioning mechanism includes a second cylinder (307), which is mounted on the side of the guide rail mounting base (306). The piston rod of the second cylinder (307) is arranged along the Y-axis direction. The piston rod of the second cylinder (307) is connected to a square plate (308). A plurality of cylinders (309) arranged linearly along the Z-axis direction are fixed on the side of the stabilizer (304). A locking block (310) is fixedly installed on the square plate (308). The locking block (310) is matched between two adjacent cylinders (309) to position the lifting plate (303) on the stabilizer (304).

5. An auxiliary ventilation device for SF6 circuit breaker maintenance according to claim 3, characterized in that: The power mechanism (13) includes a first servo motor (1301), which is located inside the first support frame (2). The output shaft of the first servo motor (1301) is arranged above the first support frame (2). A first turntable (1302) is mounted on the rotating shaft (4). A second turntable (1303) is mounted on the output shaft of the first servo motor (1301). The first turntable (1302) and the second turntable (1303) are connected by a transmission belt (1304). The first servo motor (1301) drives the rotating shaft (4) to rotate.

6. An auxiliary ventilation device for SF6 circuit breaker maintenance according to claim 1 or 2, characterized in that: The clamping assembly (6) includes two third cylinders (601) symmetrically arranged on the two side walls of the second groove (18). The piston rods of the third cylinders (601) are arranged along the Y-axis direction. A concave plate (602) is installed at the end of the piston rod of the third cylinder (601). The inner edge of the concave plate (602) is an arc surface structure. The arc surface structure contacts and clamps the outer wall of the arc extinguishing chamber of the SF6 circuit breaker after lifting.

7. An auxiliary ventilation device for SF6 circuit breaker maintenance according to claim 1 or 2, characterized in that: The third groove (19) is a double-layer slot structure. The bottom layer is a through hole and the upper layer is a groove of arbitrary shape. The maximum length of the groove is greater than the diameter of the through hole at the bottom layer. The outer walls of the first clamping cylinder (7) and the second clamping cylinder (8) are provided with sleeve plates that match the groove. The sleeve plates are installed in the groove on the upper layer of the third groove (19) and fastened with bolts to position the first clamping cylinder (7) and the second clamping cylinder (8) in their respective third grooves (19).

8. An auxiliary ventilation device for SF6 circuit breaker maintenance according to claim 1, characterized in that: The Y-axis moving assembly includes a Y-axis moving base (1201), a first lead screw guide rail (1204), and a second servo motor (1207). The first lead screw guide rail (1204) is respectively mounted on the first mounting base (10) and the second mounting base (11). The first lead screw guide rail (1204) is arranged along the Y-axis direction. The second servo motor (1207) for driving is mounted on the side of the first lead screw guide rail (1204). The Y-axis moving base (1201) is slidably engaged with the first lead screw guide rail (1204). The X-axis moving assembly includes an X-axis moving base (1202), a second lead screw guide rail (1205), and a third servo motor (1208). The second lead screw guide rail (1205) is mounted on the side of the Y-axis moving base (1201). The second lead screw guide rail (1205) is arranged along the X-axis direction. The third servo motor (1208) for driving is mounted on the side of the second lead screw guide rail (1205). The X-axis moving base (1202) and the second lead screw guide rail (1205) are in sliding engagement. The Z-axis moving assembly includes a Z-axis moving base (1203), a third lead screw guide rail (1206), and a fourth servo motor (1209). The third lead screw guide rail (1206) is fixedly mounted on the side of the Z-axis moving base (1202). The third lead screw guide rail (1206) is arranged along the Z-axis direction. The fourth servo motor (1209) for driving is mounted on the side of the third lead screw guide rail (1206). The side of the third lead screw guide rail (1206) is slidably engaged with the Z-axis moving base (1203).

9. An auxiliary ventilation device for SF6 circuit breaker maintenance according to claim 8, characterized in that: A right-angle bracket (21) is installed on the Z-axis moving seat (1203). A reference ring (22) is installed at the bottom of the right-angle bracket (21). A leak-proof cover (23) is fitted at the bottom of the reference ring (22). The leak-proof cover (23) is an inverted funnel-shaped structure. The air extraction gun (14) and the air inflation gun (15) are arranged inside their respective leak-proof covers (23).

10. A ventilation method for an SF6 circuit breaker, using an auxiliary ventilation device for SF6 circuit breaker maintenance as described in any one of claims 1-9, characterized in that... It includes the following steps: Step 1) The lifting components (3) located on both sides of the first support frame (2) are respectively the air extraction station and the air filling station; place the two SF6 circuit breakers that need to be ventilated on the lifting components (3) of the air extraction station and the lifting components (3) of the air filling station respectively. Step 2) The lifting components (3) of the extraction station and the charging station respectively lift the corresponding SF6 circuit breaker. The two SF6 circuit breakers enter the second grooves (18) on both sides of the second support frame (5). The outer walls of the arc-extinguishing chambers of the two SF6 circuit breakers are clamped by the corresponding clamping components (6). The first clamp (7) and the second clamp (8) are respectively engaged with the top of the arc-extinguishing chambers of the SF6 circuit breakers in the extraction station and the charging station. Step 3) The air extraction gun (14) moves to the SF6 circuit breaker at the air extraction station through the corresponding three-dimensional moving mechanism (12) and connects to the air nozzle interface of the SF6 circuit breaker to extract the gas in the SF6 circuit breaker. After the SF6 circuit breaker completes the air extraction, the air extraction gun (14) moves out and resets. Step 4) The power mechanism (13) drives the rotating shaft (4) to rotate the second support frame (5) together with the first clamp (7) and the second clamp (8) by 180 degrees. The two SF6 circuit breakers on the second support frame (5) switch positions. The SF6 circuit breaker after being evacuated is switched to the gas filling position. The gas filling gun (15) moves to the SF6 circuit breaker at the gas filling position through the corresponding three-dimensional moving mechanism (12) and connects to the gas nozzle interface of the SF6 circuit breaker to fill the SF6 circuit breaker with fresh SF6 gas. At the same time, the gas extraction gun (14) moves to the SF6 circuit breaker at the gas extraction position through the corresponding three-dimensional moving mechanism (12) and connects to the gas nozzle interface of the SF6 circuit breaker to extract the gas from the SF6 circuit breaker. Step 5) After the SF6 circuit breaker at the inflation station is fully inflated, the inflation gun (15) is reset, the clamping assembly (6) releases the SF6 circuit breaker, the lifting assembly (3) descends and resets, the SF6 circuit breaker is released from the first clamp (7) by gravity and descends with the lifting assembly (3), the SF6 circuit breaker is removed through the first groove (17) on the first support frame (2), a new SF6 circuit breaker that needs to be ventilated is placed, the lifting assembly (3) lifts the new SF6 circuit breaker, the clamping assembly (6) clamps the outer wall of the arc extinguishing chamber of the SF6 circuit breaker, after the SF6 circuit breaker at the extraction station is ventilated, the extraction gun (14) is removed and reset, and steps 4) and 5) are repeated to complete the ventilation of the SF6 circuit breaker.

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