A three-station mechanism

Abstract

The application discloses a three-position mechanism, which comprises a three-position rack and a cam disc, the cam disc is fixed to an insulating main shaft of a three-position switch, the three-position rack is provided with an isolation output device, an isolation transmission device, a grounding output device, a grounding transmission device and an energy storage device, the isolation output device and the grounding output device are linked with the energy storage device and control the energy storage device to store energy, the isolation transmission device and the grounding transmission device are linked with the cam disc and output opening and closing torque and grounding torque to the insulating main shaft through the cam disc, the isolation transmission device and the grounding transmission device are designed to drive the cam disc to rotate and output the opening and closing torque and the grounding torque to the insulating main shaft, the three-position mechanism has the advantages of simple structure, convenient operation, high transmission efficiency, reasonable and reliable overall structure design, high stability and long service life.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of environmentally friendly gas insulated ring main unit, and relates to a three-position mechanism. BACKGROUND

[0002] With the continuous progress and improvement of breaking and insulation technology, the development of environmentally friendly gas insulated metal-enclosed switchgear has been mature in theory and technology, and the products produced by domestic equipment manufacturing enterprises have passed type test and been put into operation, but most of the core components of environmentally friendly products on the market are wrapped with epoxy resin around the live parts, or the live parts are separated by insulating plates, so as to achieve the effect of insulation.

[0003] The current three-position mechanism is usually complex in structure, unstable in performance and high in manufacturing cost, so the isolation three-position structure is redesigned to adapt to the environmentally friendly gas insulated ring main unit. SUMMARY

[0004] The present application overcomes the deficiencies of the prior art and provides a three-position mechanism.

[0005] In order to achieve the above-mentioned purpose, the following technical scheme is adopted: a three-position mechanism, characterized by comprising a three-position rack and a cam disc, the cam disc is fixedly arranged on an insulating main shaft of a three-position switch, the three-position rack is provided with an isolation output device, an isolation transmission device, a grounding output device, a grounding transmission device and an energy storage device, the isolation output device and the grounding output device are linked with the energy storage device and control the energy storage device to store energy, the isolation transmission device and the grounding transmission device are linked with the cam disc and output closing and opening torque and grounding torque to the insulating main shaft through the cam disc.

[0006] Further, the three-position rack comprises a first mechanism plate and a second mechanism plate, the first mechanism plate is located at an operation input end of the three-position mechanism, the second mechanism plate is located at an operation output end of the three-position mechanism, and the first mechanism plate and the second mechanism plate are fixedly connected through a three-position support.

[0007] Further, the isolation output device comprises an isolation output shaft, the input end of the isolation output shaft is rotatably penetrated through the first mechanism plate, and an isolation cam sleeve is arranged on the input end of the isolation output shaft located outside the first mechanism plate, the grounding output device comprises a grounding output shaft, the input end of the grounding output shaft is rotatably penetrated through the first mechanism plate, and a grounding cam sleeve is arranged on the input end of the grounding output shaft located outside the first mechanism plate.

[0008] Further, the energy storage device comprises an isolated energy storage crank, a ground energy storage crank and an energy storage compression spring, the isolated energy storage crank is fixedly arranged on the isolated output shaft, the free end of the isolated energy storage crank is provided with an isolated transmission pin, the ground energy storage crank is fixedly arranged on the ground output shaft, the free end of the ground energy storage crank is provided with a ground transmission pin, and the two ends of the energy storage compression spring are provided with compression spring heads which are rotationally connected with the isolated transmission pin and the ground transmission pin respectively, and an energy storage telescopic rod is arranged between the two compression spring heads.

[0009] Further, the isolated transmission device comprises an isolated transmission crank, the isolated transmission crank is rotationally connected with the isolated output shaft, the side of the isolated transmission crank is fixedly provided with an isolated sliding groove, the isolated transmission pin is slidingly connected with the sliding groove, the two ends of the sliding groove are fixedly provided with isolated limiting ends for limiting the isolated transmission pin, the isolated transmission crank is fixedly provided with an isolated transmission rod, the second mechanism plate is fixedly provided with an isolated arc groove, the isolated transmission rod is inserted into the isolated arc groove and is slidingly connected with the isolated arc groove, and the isolated transmission rod is linked with the cam disc.

[0010] Further, the ground transmission device comprises a ground transmission crank, the ground transmission crank is rotationally connected with the ground output shaft, the ground transmission crank is fixedly provided with a ground sliding groove, the ground transmission pin is slidingly connected with the ground sliding groove, the two ends of the ground sliding groove are fixedly provided with ground limiting ends for limiting the ground transmission pin, the ground transmission crank is further fixedly provided with a ground transmission rod, the second mechanism plate is fixedly provided with a ground arc groove, the ground transmission rod is inserted into the ground arc groove and is slidingly connected with the ground arc groove, and the ground transmission rod is linked with the cam disc.

[0011] Further, the cam disc is provided with a moving arc groove, the moving arc groove comprises an isolated limiting arc groove and a ground limiting arc groove, the isolated limiting arc groove and the ground limiting arc groove are communicated, the isolated transmission rod is inserted into the isolated limiting arc groove and is slidingly connected with the isolated limiting arc groove, and the ground transmission rod is inserted into the ground limiting arc groove and is slidingly connected with the ground limiting arc groove.

[0012] Further, the two ends of the isolated limiting arc groove are provided with a first isolated limiting end and a second isolated limiting end, the two ends of the ground limiting arc groove are provided with a first ground limiting end and a second ground limiting end, the second isolated limiting end and the first ground limiting end are located at the junction position of the isolated limiting arc groove and the ground limiting arc groove, the junction position is provided with an upward protruding part, and the protruding part is used for preventing the isolated transmission rod from sliding into the ground limiting arc groove and preventing the ground transmission rod from sliding into the isolated limiting arc groove.

[0013] Further, the isolation limiting ends are respectively set as a first isolation limiting end and a second isolation limiting end, two ends of the isolation arc groove are set as a first isolation arc groove end and a second isolation arc groove end, the grounding limiting ends are respectively set as a first grounding limiting end and a second grounding limiting end, two ends of the grounding arc groove are set as a first grounding arc groove end and a second grounding arc groove end, the three-position switch is in an isolation state, the isolation transmission rod is located at the first isolation arc groove end, and the grounding transmission rod is located at the first grounding arc groove end.

[0014] In summary, the present application has the following advantages:

[0015] The isolation transmission device and the grounding transmission device drive the cam disc to rotate, and output the closing and opening torque and the grounding torque to the insulation main shaft, so that the structure is simple, the operation is convenient, the transmission efficiency is high, the overall structure of the three-position mechanism is reasonable and reliable, the stability is high, and the service life is long. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is an installation schematic diagram of the internal device of the environmental protection gas insulated ring network cabinet of the present application.

[0017] Figure 2 It is a schematic diagram of the three-position switch of the present application.

[0018] Figure 3 It is a shielding schematic diagram of the present application.

[0019] Figure 4 It is a shielding ring schematic diagram of the present application.

[0020] Figure 5 It is an isolation knife schematic diagram of the present application Figure 1 .

[0021] Figure 6 It is an isolation knife schematic diagram of the present application Figure 2 .

[0022] Figure 7 It is a transmission assembly schematic diagram of the present application.

[0023] Figure 8 It is a three-position mechanism schematic diagram of the present application Figure 1 .

[0024] Figure 9 It is a three-position mechanism schematic diagram of the present application Figure 2 .

[0025] Figure 10 It is a cam disc schematic diagram of the present application.

[0026] Figure 11 Fig. 2 is a schematic diagram of a second mechanism plate of the present application.

[0027] Figure 12 Fig. 3 is a schematic diagram of an isolated drive lever of the present application.

[0028] Figure 13 Fig. 4 is a schematic diagram of a grounded drive lever of the present application.

[0029] Figure 14 Fig. 5 is a schematic diagram of an indicating device of the present application.

[0030] Figure 15 Fig. 6 is a schematic diagram of a main circuit of the present application. Figure 1 .

[0031] Figure 16 Fig. 7 is a schematic diagram of a main circuit of the present application. Figure 2 .

[0032] Figure 17 Fig. 8 is a schematic diagram of an arc extinguishing contact of the present application.

[0033] Figure 18 Fig. 9 is a schematic diagram of a double-end screw of the present application.

[0034] Figure 19 Fig. 10 is a schematic diagram of an interlocking device of the present application.

[0035] Figure 20 Fig. 11 is a schematic diagram of an interlocking device installation of the present application.

[0036] Figure 21 Fig. 12 is a schematic diagram of a magnification of A in Fig. 10. Figure 20 DETAILED DESCRIPTION DETAILED DESCRIPTION

[0037] Those skilled in the art will readily observe that the application described herein with respect to the illustrative aspects can be varied, modified or supplemented based on different embodiments and that such variations, modifications or supplements can become apparent only after study or after further experimentation. Accordingly, the foregoing description is intended to be illustrative only and not limiting of the scope of the application as set forth in the following claims.

[0038] It is also noted that the specific illustrative embodiments described herein with respect to the drawings represent the application in its application for purposes of patentability and can not be precisely how the application is or will be implemented, for example, and that the specific details given herein are not to be construed as limiting, but rather as a basis for the claims as set forth below. It is also noted that the drawings are not necessarily drawn to scale and that relative dimensions of various details are intended to be approximately realistic for the purposes of the drawings as a whole.

[0039] In this embodiment of the invention, all directional indicators (such as up, down, left, right, front, back, lateral, longitudinal, etc.) are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0040] Example 1:

[0041] like Figures 1-21 As shown, a three-position mechanism is installed in an environmentally friendly gas-insulated ring main unit. The environmentally friendly gas-insulated ring main unit includes a cabinet 1, a three-position switch 2, a three-position mechanism 3, a circuit breaker main circuit 4, and a circuit breaker mechanism 5. The three-position switch 2, the three-position mechanism 3, the circuit breaker main circuit 4, and the circuit breaker mechanism 5 are installed in the cabinet 1. An interlocking device 6 is connected between the three-position mechanism 3 and the circuit breaker mechanism 5 to prevent the three-position mechanism 3 from being operated while energized. The three-position switch 2 is connected to an indicator device 9 for displaying the three-position status.

[0042] The cabinet 1 includes an air box 11, an instrument compartment 12, and a cabinet frame 13. The cabinet frame 13 is equipped with a mechanism compartment 131 and a cable compartment 132. The air box 11 is equipped with an inflation compartment 111. The circuit breaker mechanism 5 and the three-position mechanism 3 are installed in the mechanism compartment 11. The three-position switch 2 and the circuit breaker main circuit 4 are installed in the inflation compartment 111. The circuit breaker mechanism 5 is connected to the circuit breaker main circuit 4, and the three-position switch 2 is connected to the three-position mechanism 3 to realize the switching function.

[0043] A three-phase insulating bushing 7 is installed above the gas-filled compartment 111. From top to bottom, the gas-filled compartment 111 consists of the three-phase insulating bushing 7, the three-position switch 2, and the main circuit of the circuit breaker 4. The three-phase insulating bushing 7 and the three-position switch 2 are connected through the main busbar assembly 71. The three-position switch 2 is linked with the main circuit of the circuit breaker 4. The lower part of the main circuit of the circuit breaker 4 is connected to the cable compartment 132 through the branch busbar assembly 44. An explosion-proof plate 112 is fixed on the bottom plate of the gas box 11.

[0044] The instrument room is used to install secondary wiring and secondary components, such as circuit breaker buttons, indicator lights, microprocessor-based protection devices, ammeters, and voltmeters. It is the convergence point for the two-wire terminals of the environmentally friendly gas-insulated ring main unit, facilitating secondary wiring inspection and after-sales maintenance. The microprocessor-based protection device allows users to remotely query the switch's open / closed status and remotely control the switch based on the open / closed signals of the limit switches on the mechanism. At the same time, with the cooperation of current transformers and other detection elements, it can intelligently determine faults on the line and control the switch to troubleshoot or provide feedback to the background system.

[0045] like Figures 2-7As shown, the three-position switch 2 comprises a three-position bracket 21, an insulating main shaft 22 and a split and combination mechanism 23, the insulating main shaft 22 and the split and combination mechanism 23 are installed in the three-position bracket 21, the insulating main shaft 22 is linked with the split and combination mechanism 23, and the split and combination mechanism 23 comprises a shielding ring 232 and a shielding cover 233, which are used for temperature rise control and electric field uniform pressure.

[0046] The three-position bracket 21 is composed of a bracket front plate 211, a bracket rear plate 212, a first cross beam 213, a second cross beam 214 and a fourth cross beam 215, the first cross beam 213, the second cross beam 214 and the fourth cross beam 215 are horizontally and parallelly arranged and fixed between the bracket front plate 211 and the bracket rear plate 212, the bracket front plate 211 and the bracket rear plate 212 are fixedly connected with the air tank 11, the insulating main shaft 22 is horizontally arranged, the output end of the insulating main shaft 22 is rotationally connected with the bracket rear plate 212, and the input end of the insulating main shaft 22 penetrates through the bracket front plate 211 and is connected with a dynamic seal 25 of the bracket front plate 211.

[0047] The split and combination mechanism 23 comprises a three-phase upper insulator 230, a three-phase lower insulator 231 and a transmission assembly, the three-phase upper insulator 230 is fixedly arranged on the first cross beam 213, a busbar row 2301 is fixedly arranged on the three-phase upper insulator 230, the busbar row 2301 is fixedly connected with the three-phase insulating sleeve 7, a closing grounding contact seat 2302 is fixedly arranged on the busbar row 2301, the three-phase lower insulator 231 is fixedly arranged on the second cross beam 214, a transition row 2311 is fixedly arranged on the three-phase lower insulator 231, and an arc-extinguishing chamber contact seat 2312 is fixedly arranged on the transition row 2311.

[0048] The transmission assembly further comprises a connecting rod structure, the connecting rod structure comprises a transmission crank 2341, two groups of dynamic knife pull rods 2342 and a dynamic knife pull plate 2343, the transmission crank 2341 is fixedly arranged on the insulating main shaft 22, the two groups of dynamic knife pull rods 2342 are symmetrically arranged, the two ends of the dynamic knife pull rods 2342 are respectively rotationally connected with the transmission crank 2341 and the dynamic knife pull plate 2343, and nylon pins 2340 are fixedly arranged on the insulating main shaft 22 and located on both sides of the transmission crank 2341, so as to further limit the movement of the transmission crank 2341.

[0049] The transmission assembly further comprises two sets of isolation knives 235, which are arranged in parallel and fixedly connected through a first knife support 2351 and a second knife support 2356. A connecting rod 2357 is further fixedly arranged between the first knife support 2351 and the second knife support 2356, and the connecting rod 2357 is rotationally connected with the moving knife pull plate 2343. The isolation knife 235 comprises a first side surface 2358 and a second side surface 2359. The first side surfaces 2358 of the two sets of isolation knives 235 are opposite to each other, and the second side surfaces 2359 are away from each other. The first side surface 2358 of the isolation knife 235 is fixedly provided with a first contact point 2355 at the knife head and a second contact point 2354 at the knife tail, which are in contact with or separated from the arc-extinguishing chamber contact seat 2312.

[0050] The shielding cover 233 is fixedly arranged at the knife head of the isolation knife 235. Specifically, the shielding cover 233 is provided with a stepped shielding cover mounting hole 2331. The first knife support 2351 penetrates through the shielding cover mounting hole 2331, and standard parts are arranged at both ends to fixedly connect the shielding cover 233 with the first knife support 2351. The standard parts are wrapped inside the shielding cover 233 through the shielding cover mounting hole 2331, which serves to uniformly isolate the electric field around the isolation knife 235 and reduce the inter-phase insulation clearance. In the embodiment, the shielding cover 233 is fixedly arranged at the knife head of the isolation knife 235, which can increase the heat dissipation area of the isolation knife 235, thereby improving the temperature rise margin at the grounding contact seat 2302 and the isolation knife 235.

[0051] The shielding ring 232 is installed at the knife tail of the isolation knife 235 through a second standard part 2322. The second standard part 2322 is rotationally connected with the arc-extinguishing chamber contact seat 2312. The shielding ring 232 is fixedly provided with a shielding ring mounting hole 2321, and the second standard part 2322 is located inside the shielding ring mounting hole 2321. The second standard part 2322 is wrapped inside the shielding ring 232 through the shielding ring mounting hole 2321, which serves to uniformly isolate the electric field around the isolation knife 235 and reduce the inter-phase insulation clearance. In the embodiment, the shielding ring 232 is installed at the knife tail of the isolation knife 235, which can increase the heat dissipation area of the isolation knife 235, thereby improving the temperature rise margin at the arc-extinguishing chamber contact seat 2312 and the isolation knife 235.

[0052] The transmission assembly further comprises a contact seat assembly 236, which comprises a grounding row 2361 and a grounding contact seat 2362. The grounding row 2361 is fixedly arranged on the fourth cross beam 215. The grounding contact seat 2362 is inserted between the two sets of isolation knives 235, and the two sides of the grounding contact seat 2362 are in contact with or separated from the first contact point 2355.

[0053] The shield cover 233, the shield ring 232 and the isolation knife 235 are rounded, without edges and without corners, so that the part itself ensures uniform electric field when electrified, and the insulation performance of the main circuit is improved.

[0054] During the implementation of the three-position switch 2, when the three-position mechanism 3 performs the opening operation, the insulating main shaft 22 is driven to rotate, the transmission assembly is driven to rotate by the insulating main shaft 22, the isolation knife 235 is separated from the grounding row 2361 and kept in the isolation position, and the insulation clearance of the air tank side shell is increased at this time.

[0055] The three-position switch 2 can be independently moved into the existing ring network cabinet.

[0056] As shown in Figures 8-13 The three-position mechanism 3 includes a three-position frame 31 and a cam disc 32, the cam disc 32 is fixedly arranged on the insulating main shaft 22, the isolation output device, the isolation transmission device, the grounding output device, the grounding transmission device and the energy storage device are arranged on the three-position frame 31, the isolation output device and the grounding output device are linked with the energy storage device and control the energy storage device to store energy, the isolation transmission device and the grounding transmission device are linked with the cam disc 32 and output the closing and opening torque and the grounding torque to the insulating main shaft 22 through the cam disc 32.

[0057] The three-position frame 31 includes a first mechanism plate 311 and a second mechanism plate 312, the first mechanism plate 311 is located at the operation input end of the three-position mechanism 3, the second mechanism plate 312 is located at the operation output end of the three-position mechanism 3, the first mechanism plate 311 and the second mechanism plate 312 are fixedly connected through the three-position support 313, and generally, the first mechanism plate 311 and the second mechanism plate 312 are arranged in parallel; the second mechanism plate 312 is fixedly connected with the partition plate of the mechanism chamber 131 through the fixed support 324, so that the three-position mechanism 3 is installed in the mechanism chamber 131.

[0058] The isolation output device includes an isolation output shaft 33, the input end of the isolation output shaft 33 is rotatably arranged through the first mechanism plate 311, and the isolation cam sleeve 331 is fixedly arranged on the input end of the isolation output shaft 33 located outside the first mechanism plate 311.

[0059] The grounding output device includes a grounding output shaft 34, the input end of the grounding output shaft 34 is rotatably arranged through the first mechanism plate 311, and the grounding cam sleeve 341 is fixedly arranged on the input end of the grounding output shaft 34 located outside the first mechanism plate 311.

[0060] The energy storage device comprises an isolated energy storage crank arm 351, a grounding energy storage crank arm 352 and an energy storage compression spring 353. The isolated energy storage crank arm 351 is fixedly arranged on the isolated output shaft 33 and can rotate with the isolated output shaft 33. The free end of the isolated energy storage crank arm 351 is provided with an isolated transmission pin 3511. The grounding energy storage crank arm 352 is fixedly arranged on the grounding output shaft 34 and can rotate with the grounding output shaft 34. The free end of the grounding energy storage crank arm 352 is provided with a grounding transmission pin 3521. The two ends of the energy storage compression spring 353 are provided with spring heads 3531. The spring heads 3531 are rotationally connected with the isolated transmission pin 3511 and the grounding transmission pin 3521 respectively. An energy storage telescopic rod 3532 is arranged between the two groups of spring heads 3531. When the energy storage compression spring 353 is stretched or retracted, the energy storage telescopic rod 3532 can be stretched or retracted accordingly.

[0061] The isolated transmission device comprises an isolated transmission crank arm 36. The isolated transmission crank arm 36 is rotationally connected with the isolated output shaft 33. The side of the isolated transmission crank arm 36 is fixedly provided with an isolated sliding groove 361. The isolated transmission pin 3511 slides along the sliding groove 361. The two ends of the sliding groove 361 are fixedly provided with isolated limiting ends for limiting the isolated transmission pin 3511. As shown in the drawings, the isolated limiting ends are respectively provided as a first isolated limiting end 3611 and a second isolated limiting end 3612. Figure 12 The isolated transmission crank arm 36 is further fixedly provided with an isolated transmission rod 362. The second mechanism plate 312 is fixedly provided with an isolated arc groove 3121. The two ends of the isolated arc groove 3121 are provided as a first isolated arc groove end 31211 and a second isolated arc groove end 31212. The isolated transmission rod 362 is inserted into the isolated arc groove 3121 and slides along the isolated arc groove 3121. The isolated transmission rod 362 is linked with the cam disc 32. When the three-position switch 2 performs closing operation, the isolated transmission rod 362 slides from the second isolated arc groove end 31212 to the first isolated arc groove end 31211. When the three-position switch 2 performs opening operation, the isolated transmission rod 362 slides from the first isolated arc groove end 31211 to the second isolated arc groove end 31212.

[0062] The grounding transmission device comprises a grounding transmission crank arm 37. The grounding transmission crank arm 37 is rotationally connected with the grounding output shaft 34. The grounding transmission crank arm 37 is fixedly provided with a grounding sliding groove 371. The grounding transmission pin 3521 slides along the grounding sliding groove 371. The two ends of the grounding sliding groove 371 are fixedly provided with grounding limiting ends for limiting the grounding transmission pin 3521. As shown in the drawings, the grounding limiting ends are respectively provided as a first grounding limiting end 3711 and a second grounding limiting end 3712. Figure 13As shown, the ground limiting ends are respectively set as a first ground limiting end 3711 and a second ground limiting end 3712; a ground transmission rod 372 is further fixed on the ground transmission crank 37; a ground arc groove 3122 is fixed on the second mechanism plate 312, and the two ends of the ground arc groove 3122 are set as a first ground arc groove end 31221 and a second ground arc groove end 31222; the ground transmission rod 372 is inserted into the ground arc groove 3122 and slides along the ground arc groove 3122; the ground transmission rod 372 is connected with the cam disc 32; when the three-position switch 2 performs the grounding operation, the ground transmission rod 372 slides from the first ground arc groove end 31221 to the second ground arc groove end 31222.

[0063] The cam disc 32 is provided with a plate structure, including a cam disc mounting hole 321, the center axis of the cam disc mounting hole 321 is collinear with the center axis of the insulating main shaft 22; the insulating main shaft 22 is connected with the cam disc 32 through a connecting shaft 26; specifically, one end of the connecting shaft 26 is located in the inflation compartment 111, and a first connecting hole 261 is fixed on the one end of the connecting shaft 26; the cross section of the first connecting hole 261 is provided with a polygonal shape, preferably a hexagonal shape, which is matched with the cross section of the insulating main shaft 22; the insulating main shaft 22 is inserted into the first connecting hole 261 and fixedly connected, which can prevent the insulating main shaft 22 from rotating relative to the connecting shaft 26; the other end of the connecting shaft 26 is located in the mechanism chamber 131, and the outer cross section of the other end of the connecting shaft 26 is provided with a polygonal shape, preferably a square shape, which is matched with the cross section of the cam disc mounting hole 321; the other end of the connecting shaft 26 is inserted into the cam disc mounting hole 321 and fixedly connected, which can prevent the cam disc 32 from rotating relative to the connecting shaft 26; the other end of the connecting shaft 26 is provided with a second connecting hole 262; the dynamic seal 25 is sleeved outside the connecting shaft 26, and the three-position support 21 and the mechanism chamber 131 are sealed and connected through the dynamic seal 25.

[0064] The cam disc 32 is further provided with a moving arc groove, including an isolation limiting arc groove 322 and a ground limiting arc groove 323; the isolation limiting arc groove 322 and the ground limiting arc groove 323 are communicated; the isolation transmission rod 362 is inserted into the isolation limiting arc groove 322 and slides along the isolation limiting arc groove 322; the ground transmission rod 372 is inserted into the ground limiting arc groove 323 and slides along the ground limiting arc groove 323.

[0065] The two ends of the isolation limiting arc groove 322 are set as a first isolation limiting end 3221 and a second isolation limiting end 3222; the two ends of the ground limiting arc groove 323 are set as a first ground limiting end 3231 and a second ground limiting end 3232; the second isolation limiting end 3222 and the first ground limiting end 3231 are located at the junction position of the isolation limiting arc groove 322 and the ground limiting arc groove 323; the junction position is provided with an upward protruding part; the protruding part is used to prevent the isolation transmission rod 362 from sliding into the ground limiting arc groove 323 and to prevent the ground transmission rod 372 from sliding into the isolation limiting arc groove 322.

[0066] When the three-position switch 2 is in the isolated state, the isolation transmission rod 362 is located at the end of the second isolation arc groove 31212 and the second isolation limiting end 3222, and the grounding transmission rod 372 is located at the first grounding limiting end 3231. When the three-position switch 2 performs a closing operation, the isolation transmission crank arm 36 drives the isolation transmission rod 362 to slide from the end of the second isolation arc groove 31212 to the end of the first isolation arc groove 31211. During this process, the isolation transmission rod 362 moves vertically, causing the isolation transmission rod 362 to slide from the second isolation limiting end 3222 to the first isolation limiting end 3231. The grounding transmission rod 372 slides along the grounding limiting arc groove 323. The arc shape of the grounding limiting arc groove 323 matches the path of the isolation transmission rod 362 driving the cam disk 32 to rotate, so that when the cam disk 32 performs the closing operation, it will not affect the grounding transmission rod 372. The end of the grounding limiting arc groove 323 is set as the limiting end 3232. When the cam disk 32 is in the closed state, the grounding transmission rod 372 moves into the limiting end 3232.

[0067] When the three-position switch 2 performs a grounding operation, the grounding transmission crank arm 37 drives the grounding transmission rod 372 to slide from the end of the first grounding arc groove 31221 to the end of the second grounding arc groove 31222. The arc shape of the isolation limiting arc groove 322 matches the path of the grounding transmission rod 372 driving the cam disk 32 to rotate, so that when the cam disk 32 performs a grounding operation, it will not affect the isolation transmission rod 362. The grounding transmission rod 372 drives the cam disk 32 to rotate along the insulating main shaft 22, so as to output grounding torque to the insulating main shaft 22.

[0068] To ensure safety, closing or grounding operations can only be performed when the three-position switch 2 is in the isolated state, such as... Figure 9 As shown, the three-position switch 2 is in the isolated state. At this time, the isolation transmission pin 3511 is located at the second limiting end 3612. When the three-position switch 2 performs the closing operation, the external force drives the isolation output shaft 33 to rotate. The isolation output shaft 33 drives the isolation energy storage crank arm 351 to rotate. The isolation energy storage crank arm 351 drives the isolation transmission pin 3511 to slide along the isolation slide groove 361, thereby driving the energy storage spring 353 to store energy. When the rotation reaches the maximum energy storage position of the energy storage spring 353, the external force is removed. The isolation output device will continue to rotate under the action of inertia and make the energy storage spring 353 rotate past the maximum energy storage position, releasing the stored energy and driving the isolation transmission crank arm 36 to rotate through the isolation transmission pin 3511. This causes the isolation transmission rod 362 to drive the cam disk 32 to rotate, and outputs the closing torque to the insulating main shaft 22 through the cam disk 32.

[0069] In the process of the energy storage compression spring 353 reaching the maximum energy storage position, the isolation transmission pin 3511 slides from the second limiting end 3612 to the first limiting end 3611 along the sliding groove 361, in the process, the isolation transmission crank 36 does not rotate, when the energy storage compression spring 353 releases the energy storage, the isolation transmission pin 3511 drives the isolation transmission crank 36 to rotate through the first limiting end 3611, and then the isolation transmission rod 362 drives the cam disc 32 to rotate, and the cam disc 32 outputs the closing torque to the insulated main shaft 22; when the three-position switch 2 needs to be opened, the reverse operation is performed, and the cam disc 32 outputs the opening torque to the insulated main shaft 22.

[0070] When the three-position switch 2 is in the isolation state, the grounding transmission pin 3521 is located at the first grounding limiting end 3711, when the three-position switch 2 is operated, the external force drives the grounding output shaft 34 to rotate, the grounding output shaft 34 drives the grounding energy storage crank 352 to rotate, the grounding energy storage crank 352 drives the grounding transmission pin 3521 to slide along the grounding sliding groove 371, and then drives the energy storage compression spring 353 to store energy, when the rotation reaches the maximum energy storage position of the energy storage compression spring 353, the external force is removed, the grounding output device continues to rotate under the action of inertia and makes the energy storage compression spring 353 rotate through the maximum energy storage position, releases the energy storage and drives the grounding transmission crank 37 to rotate through the grounding transmission pin 3521, so that the grounding transmission rod 372 drives the cam disc 32 to rotate, and the cam disc 32 outputs the grounding torque to the insulated main shaft 22.

[0071] In the process of the energy storage compression spring 353 reaching the maximum energy storage position, the grounding transmission pin 3521 slides from the first grounding limiting end 3711 to the second grounding limiting end 3712 along the grounding sliding groove 371, in the process, the grounding transmission crank 37 does not rotate, when the energy storage compression spring 353 releases the energy storage, the grounding transmission pin 3521 drives the grounding transmission crank 37 to rotate through the second grounding limiting end 3712, and then the grounding transmission rod 372 drives the cam disc 32 to rotate, and the cam disc 32 outputs the grounding torque to the insulated main shaft 22.

[0072] The embodiment drives the cam disc 32 to rotate by the isolation transmission device and the grounding transmission device, and outputs the opening and closing torques and the grounding torque to the insulated main shaft 22, which is simple in structure, convenient to operate and high in transmission efficiency.

[0073] The three-position mechanism 3 further comprises a three-position mechanism interlocking plate 38, the three-position mechanism interlocking plate 38 is fixedly provided with a lower cover plate 381, an upper cover plate 382 and a dial plate 383, the three-position mechanism interlocking plate 38 is controlled to move up or down by the external force dialing the dial plate 383, when the three-position mechanism interlocking plate 38 moves up, the upper cover plate 382 covers the isolation cam sleeve 331, when the three-position mechanism interlocking plate 38 moves down, the lower cover plate 381 covers the grounding cam sleeve 341, so that the isolation output shaft 33 and the grounding output shaft 34 cannot be operated at the same time.

[0074] The three-position mechanism 3 further comprises an interlocking device for isolating the output device and the grounding output device, the interlocking device comprising a hanging plate 391, the hanging plate 391 being fixedly provided with an adjusting waist-shaped hole 392, the first mechanism plate 311 being fixedly provided with an interlocking column 3111, the interlocking column 3111 being inserted into the adjusting waist-shaped hole 392, so that the hanging plate 391 is hung on the first mechanism plate 311, both ends of the hanging plate 391 being respectively provided with an isolation interlocking hole 394 for locking the isolation output shaft 33 and a grounding interlocking hole 395 for locking the grounding output shaft 34, the isolation interlocking hole 394 and the grounding interlocking hole 395 being provided with notches, the isolation output shaft 33 and the grounding output shaft 34 being respectively provided with cutouts matched with the notches of the isolation interlocking hole 394 and the grounding interlocking hole 395, in the interlocking process of the embodiment, when the three-position switch 2 is in the isolation state, the cutouts of the isolation output shaft 33 and the grounding output shaft 34 are opposite to the notches of the isolation interlocking hole 394 and the grounding interlocking hole 395, at this time, the hanging plate 391 is in the unlocked state with the isolation output device and the grounding output device, the hanging plate 391 can move up and down within the limited range of the adjusting waist-shaped hole 392, so as to realize the closing or grounding operation of the three-position switch, when the three-position switch is in the closed state, the arc surface of the isolation output shaft 33 is abutted against the notch of the isolation interlocking hole 394, the cutout of the grounding output shaft 34 is opposite to the notch of the grounding interlocking hole 395 and is limited, at this time, the grounding output shaft 34 cannot be operated, when the grounding output device is in the grounding state, the arc surface of the grounding output shaft 34 is abutted against the notch of the grounding interlocking hole 395, the cutout of the isolation output shaft 33 is opposite to the notch of the isolation interlocking hole 394 and is limited, so as to realize that only when the isolation output device and the grounding output device are both in the isolation state, the grounding or closing operation of the three-position switch can be performed.

[0075] The three-position mechanism 3 can be independently applied to the existing ring network cabinet.

[0076] As shown in Figure 14 The indicating device 9 is used to display the state of the three-position switch 2, the indicating device 9 comprising an indicating main shaft 91 and an indicating plate 92, the indicating main shaft 91 being connected with the insulation main shaft 22 of the three-position switch 2, the indicating plate 92 being connected with the indicating main shaft 91, and being used to display the state of the three-position switch 2.

[0077] Further comprising a connecting device for connecting the indicating device 9 and the insulation main shaft 22, the connecting device comprising a connecting shaft 26, one end of the connecting shaft 26 being fixedly provided with a second connecting hole 262, the indicating main shaft 91 being inserted into the second connecting hole 262 and being fixedly connected, the other end of the connecting shaft 26 being fixedly provided with a first connecting hole 261, the insulation main shaft 22 being inserted into the first connecting hole 261 and being fixedly connected.

[0078] The connecting shaft 26 is sleeved with the dynamic seal 25, and the connecting shaft 26 is sealingly connected with the three-position support 21 and the mechanism chamber 131 partition plate through the dynamic seal 25.

[0079] The indicating device 9 of the embodiment is connected with the insulated main shaft 22, the state of the three-position switch 2 is directly output to the indicating device 9 through the insulated main shaft 22, and is displayed by the indicating board 92, and the intermediate transmission component is abandoned, and the indicating efficiency of the state of the three-position switch 2 is improved.

[0080] The indicating device 9 can be independently applied to the existing ring network cabinet.

[0081] As shown in the drawings, Figures 15-18 The circuit breaker main circuit 4 comprises a circuit breaker main circuit rack 41, the circuit breaker main circuit rack 41 is provided with an arc extinguishing chamber assembly 42 and a main circuit power assembly 43, the arc extinguishing chamber assembly 42 comprises an arc extinguishing contact seat 8, the arc extinguishing contact seat 8 comprises an arc extinguishing contact seat column piece 81 and an arc extinguishing contact seat surface piece 82 which are integrally formed, and the main circuit power assembly 43 comprises a support shielding ring 434, the arc extinguishing contact seat 8 and the support shielding ring 434 are used for uniform peripheral electric field.

[0082] The circuit breaker main circuit rack 41 comprises two groups of circuit breaker main circuit support plates 411, generally, the two groups of circuit breaker main circuit support plates 411 are arranged in parallel, the arc extinguishing chamber support plates 412 and the epoxy support plates 413 are fixedly arranged between the two groups of circuit breaker main circuit support plates 411, the arc extinguishing chamber support plates 412 and the epoxy support plates 413 are respectively fixedly arranged in three groups, the three groups of arc extinguishing chamber support plates 412 and the epoxy support plates 413 are horizontally distributed, the arc extinguishing chamber support plates 412 are located above the epoxy support plates 413, and the shaft mounting plates 414 are fixedly arranged on the two groups of circuit breaker main circuit support plates 411; the arc extinguishing chamber assembly 42 comprises vacuum bubble sub 421 and the arc extinguishing contact seat 8, the arc extinguishing contact seat 8 is fixedly connected with the vacuum bubble sub 421, the arc extinguishing contact seat 8 is fixedly connected with the arc extinguishing chamber support plates 412 through the first fixing piece 415, the epoxy support plates 413 are connected with the vacuum bubble sub 421 and used for supporting the vacuum bubble sub 421.

[0083] The arc extinguishing contact seat 8 comprises the arc extinguishing contact seat column piece 81 and the arc extinguishing contact seat surface piece 82, the arc extinguishing contact seat column piece 81 is vertically arranged on one side of the arc extinguishing contact seat surface piece 82, the arc extinguishing contact seat column piece 81 is integrally designed with the arc extinguishing contact seat surface piece 82, and local discharge hidden danger caused by assembly is eliminated, the structure of the arc extinguishing contact seat 8 of the embodiment replaces the existing copper row bending, through symmetrical design, installation of the isolation knife 235 and the vacuum bubble sub 421 are ensured to be on the same horizontal plane, so that rationality of interphase (longitudinal) insulation clearance distribution of the circuit breaker main circuit 4 is ensured, the other side of the arc extinguishing contact seat surface piece 82 is fixedly provided with an arc extinguishing contact seat hole 83, the arc extinguishing contact seat hole 83 is opposite to a support plate mounting hole on the arc extinguishing chamber support plates 412, the first fixing piece 415 is inserted into the arc extinguishing contact seat hole 83 and the support plate mounting hole and realizes fixed connection of the arc extinguishing contact seat 8 and the arc extinguishing chamber support plates 412.

[0084] In this embodiment, the arc-extinguishing contact seat column member 81 is a column structure, the upper end of the arc-extinguishing contact seat column member 81 is fixedly provided with an arc-extinguishing plate 84 of a flat plate structure, the thickness of the arc-extinguishing plate 84 is less than the diameter of the arc-extinguishing contact seat column member 81, and a bevel 845 is arranged at the junction of the arc-extinguishing contact seat column member 81 and the arc-extinguishing plate 84 to achieve smooth connection. The arc-extinguishing contact seat column member 81 and the arc-extinguishing plate 84 are designed in an integrated manner to eliminate the local discharge hidden danger caused by assembly. The arc-extinguishing plate 84 is fixedly provided with a concave groove 841, the arc-extinguishing plate 84 is connected with the isolation knife 235, the groove 841 is matched with the second contact point 2354 of the isolation knife 235, the second contact point 2354 is clamped into the groove 841, the positioning of the installation of the two is facilitated, and the relative rotation of the isolation knife 235 and the arc-extinguishing contact seat 8 is facilitated.

[0085] The main circuit power assembly 43 comprises an insulating main shaft 431, three groups of pressure maintaining supports 433 are rotationally arranged on the insulating main shaft 431, a support shielding ring 434 is arranged outside one group of circuit breaker main circuit support plates 411, the support shielding ring 434 is fixedly connected with the pressure maintaining supports 433, a branch busbar 437 is arranged outside another group of circuit breaker main circuit support plates 411, the branch busbar 437 is fixedly connected with the pressure maintaining supports 433, the branch busbar 437 is fixedly connected with a branch busbar assembly 44, a stepped shielding ring mounting hole 4341 is fixedly arranged on the support shielding ring 434, first mounting holes corresponding to the shielding ring mounting hole 4341 are fixedly arranged on the circuit breaker main circuit support plates 411 and the pressure maintaining supports 433, and second fixing members are sequentially inserted into the shielding ring mounting hole 4341 and the first mounting holes and fixedly connected with the support shielding ring 434, the circuit breaker main circuit support plates 411 and the pressure maintaining supports 433. The second fixing members are inside the support shielding ring 434 through the shielding ring mounting hole 4341, the electric field around the second fixing members is uniform, and thus the insulation requirement of the second fixing members to the side shell of the gas tank 11 is ensured.

[0086] A plurality of pressure maintaining cams 432 are rotationally arranged on the insulating main shaft 431, two groups of pressure maintaining cams 432 correspond to one group of pressure maintaining supports 433. In this embodiment, the two groups of pressure maintaining cams 432 are respectively located on the two sides of the pressure maintaining supports 433, and arc-shaped grooves 4321 are fixedly arranged on the pressure maintaining cams 432.

[0087] The vacuum bubble 421 is rotationally arranged with a double-head screw rod 439, the double-head screw rod 439 is provided with opposite threads, that is, one end is provided with a right-hand thread and the other end is provided with a left-hand thread, so as to realize the functions of adjusting the opening distance and overtravel of the vacuum bubble 421, and solve the problem that the opening distance cannot be adjusted and only the overtravel can be adjusted when both ends are provided with conventional threads. In this embodiment, the double-head screw rod 439 adopts a fine thread, which solves the problem that the opening distance cannot be accurately adjusted by a coarse thread. At the same time, the fine thread has better self-locking performance, which can improve the mechanical stability of the circuit breaker main circuit 4. The double-head screw rod 439 is fixedly provided with a flexible connection 438, and the flexible connection 438 is fixedly connected with the branch busbar 437.

[0088] The double-end screw 439 is helically connected with the vacuum switch pull rod 435, the lower end of the vacuum switch pull rod 435 is provided with a pressure maintaining cap sleeve, the pressure maintaining cap sleeve is provided with a pulley which is in sliding connection with the arc-shaped groove 4321, and the pressure maintaining spring 436 is arranged between the vacuum switch pull rod 435 and the pressure maintaining cap sleeve.

[0089] During the implementation of the circuit breaker main circuit 4, the circuit breaker mechanism 5 performs closing or opening operation to drive the rotation of the insulating main shaft 431, the rotation of the insulating main shaft 431 drives the up-and-down movement of the double-end screw 439, thereby controlling the circuit breaker main circuit 4 to be in the closing or opening state.

[0090] The support shielding ring 434, the branch busbar 437 and the surface of the arc extinguishing contact seat 8 are designed with rounded corners, no edges and corners, so that the uniform electric field of the parts itself is ensured when the parts are electrified, and the purpose of improving the insulation performance of the circuit breaker main circuit 4 is achieved.

[0091] The circuit breaker main circuit 4 can be moved alone into the existing ring network cabinet.

[0092] As shown in Figures 19-21 The interlocking device 6 includes a circuit breaker interlocking plate 61 and a three-position interlocking plate 62, the three-position interlocking plate 62 is connected with the three-position mechanism 3, the circuit breaker mechanism 5 controls the movement of the circuit breaker interlocking plate 61 through the buckle device, and the movement of the three-position interlocking plate 62 is limited.

[0093] The interlocking device 6 is fixedly connected with the circuit breaker mechanism 5 or / and the three-position mechanism 3 through the interlocking fixed plate 63, the circuit breaker interlocking plate 61 is fixedly provided with a first interlocking hole 611 and a second interlocking hole 612, the circuit breaker mechanism 5 is provided with a sliding rod 613 on the circuit breaker rack, the sliding rod 613 is located in the second interlocking hole 612 and slides along the second interlocking hole 612, and the circuit breaker mechanism 5 includes an energy storage operation handle 52 which penetrates through the first interlocking hole 611.

[0094] The three-position interlocking plate 62 is rotationally connected with the interlocking fixed plate 63, the two ends of the three-position interlocking plate 62 are fixedly provided with an interlocking waist-shaped hole 621, and the circuit breaker interlocking plate 61 and the three-position interlocking plate 62 and the three-position interlocking plate 62 and the three-position mechanism interlocking plate 38 are rotationally connected through fastening rotating members.

[0095] The interlocking device 6 further comprises an interlocking recovery mechanism 64, which comprises a first interlocking rod 641, a second interlocking rod 642, a third interlocking rod 643, and a recovery spring 644. The first interlocking rod 641 and the second interlocking rod 642 are fixedly arranged on the interlocking fixed plate 63, the third interlocking rod 643 is fixedly arranged on the circuit breaker interlocking plate 61, the recovery spring 644 is sleeved on the first interlocking rod 641, and two groups of spring output ends 645 of the recovery spring 644 are located on both sides of the second interlocking rod 642 and the third interlocking rod 643. When the three-position mechanism interlocking plate 38 moves downward, the third interlocking rod 643 drives the spring output end 645 on the upper side to move upward, and the second interlocking rod 642 is used to limit the spring output end 645 on the lower side. When the three-position mechanism interlocking plate 38 moves upward, the third interlocking rod 643 drives the spring output end 645 on the lower side to move downward, and the second interlocking rod 642 is used to limit the spring output end 645 on the upper side. After the corresponding operation is completed, the circuit breaker interlocking plate 61 is controlled to return to the initial state by the recovery spring 644.

[0096] The buckle device comprises a first buckle plate 651 and a second buckle plate 652, which are fixedly arranged on the circuit breaker interlocking plate 61, and the first buckle plate 651 is located above the second buckle plate 652. The circuit breaker mechanism 5 comprises a circuit breaker indication assembly, which is connected with the circuit breaker operation assembly to display the state of the circuit breaker main circuit 4. The circuit breaker indication assembly comprises a circuit breaker indication main shaft 51 and a circuit breaker indication plate 53. The indication main shaft 51 is connected with the circuit breaker operation assembly, the state of the circuit breaker operation assembly controls the rotation direction of the circuit breaker indication main shaft 51, and then different states of the circuit breaker main circuit 4 are displayed through the rotation direction of the circuit breaker indication plate 53.

[0097] The circuit breaker indication main shaft 51 is provided with a buckle cutout 511. When the circuit breaker main circuit 4 is in the closed state, the circuit breaker indication main shaft 51 rotates to make the circuit breaker indication main shaft 51 clamped between the first buckle plate 651 and the second buckle plate 652, thereby locking the circuit breaker interlocking plate 61. At this time, the three-position mechanism interlocking plate 38 cannot be moved by the three-position interlocking plate 62, and the isolation output shaft 33 and the grounding output shaft 34 are in the state of being covered by the three-position mechanism interlocking plate 38. When the circuit breaker main circuit 4 is opened, the circuit breaker indication main shaft 51 rotates to make the buckle cutout 511 disengage from the interference state with the first buckle plate 651 and the second buckle plate 652, thereby unlocking the circuit breaker interlocking plate 61. At this time, the three-position mechanism interlocking plate 38 is operated to move upward or downward, and the three-position mechanism 3 is operated, so as to realize the purpose that the three-position mechanism 3 cannot be operated when the circuit breaker main circuit 3 is in the closed state, thereby ensuring the safety of operation.

[0098] The interlocking device 6 can be independently applied to the existing ring network cabinet.

[0099] Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

Claims

1. A three-station mechanism, characterized in that: The device includes a three-position frame and a cam disk. The cam disk is fixed to the insulated main shaft of the three-position switch. The three-position frame is equipped with an isolation output device, an isolation transmission device, a grounding output device, a grounding transmission device, and an energy storage device. The isolation output device and the grounding output device are linked with the energy storage device and control the energy storage device to store energy. The isolation transmission device and the grounding transmission device are linked with the cam disk and output closing / opening torque and grounding torque to the insulated main shaft through the cam disk, respectively. The cam disk is provided with a movable arc groove, which includes an isolation limiting arc groove and a grounding limiting arc groove. The isolation limiting arc groove and the grounding limiting arc groove are connected. The isolation transmission rod of the isolation transmission device is inserted into the isolation limiting arc groove and slidably connected to it. The grounding transmission rod of the grounding transmission device is inserted into the grounding limiting arc groove and slidably connected to it.

2. The three-station mechanism according to claim 1, characterized in that: The three-station frame includes a first mechanism plate and a second mechanism plate. The first mechanism plate is located at the operation input end of the three-station mechanism, and the second mechanism plate is located at the operation output end of the three-station mechanism. The first mechanism plate and the second mechanism plate are fixedly connected by a three-station support column.

3. A three-station mechanism according to claim 2, characterized in that: The isolation output device includes an isolation output shaft, the input end of which rotatably passes through the first mechanism plate, and an isolation cam sleeve is provided on the input end of the isolation output shaft located outside the first mechanism plate. The grounding output device includes a grounding output shaft, the input end of which rotatably passes through the first mechanism plate, and a grounding cam sleeve is provided on the input end of the grounding output shaft located outside the first mechanism plate.

4. A three-station mechanism according to claim 3, characterized in that: The energy storage device includes an isolation energy storage crank arm, a grounding energy storage crank arm, and an energy storage spring. The isolation energy storage crank arm is fixed to the isolation output shaft, and the free end of the isolation energy storage crank arm is provided with an isolation transmission pin. The grounding energy storage crank arm is fixed to the grounding output shaft, and the free end of the grounding energy storage crank arm is provided with a grounding transmission pin. The two ends of the energy storage spring are provided with spring heads, which are rotatably connected to the isolation transmission pin and the grounding transmission pin, respectively. An energy storage telescopic rod is provided between the two sets of spring heads.

5. A three-station mechanism according to claim 3, characterized in that: The isolation transmission device includes an isolation transmission crank arm, which is rotatably connected to an isolation output shaft. An isolation groove is fixedly provided on the side of the isolation transmission crank arm, and an isolation transmission pin is slidably connected to the groove. Isolation limiting ends for limiting the isolation transmission pin are fixedly provided at both ends of the groove. An isolation transmission rod is fixedly provided on the isolation transmission crank arm, and an isolation arc groove is fixedly provided on the second mechanism plate. The isolation transmission rod is inserted into the isolation arc groove and slidably connected to the isolation arc groove. The isolation transmission rod is linked with the cam disc.

6. A three-station mechanism according to claim 5, characterized in that: The grounding transmission device includes a grounding transmission crank arm, which is rotatably connected to the grounding output shaft. The grounding transmission crank arm is fixedly provided with a grounding groove, and the grounding transmission pin is slidably connected to the grounding groove. Both ends of the grounding groove are fixedly provided with grounding limiting ends for limiting the grounding transmission pin. The grounding transmission crank arm is also fixedly provided with a grounding transmission rod. A grounding arc groove is fixedly provided on the second mechanism plate. The grounding transmission rod is inserted into the grounding arc groove and slidably connected to the grounding arc groove. The grounding transmission rod is linked with the cam disc.

7. A three-station mechanism according to claim 1, characterized in that: The two ends of the isolation limiting arc groove are configured as a first isolation limiting end and a second isolation limiting end, and the two ends of the ground limiting arc groove are configured as a first ground limiting end and a second ground limiting end. The second isolation limiting end and the first ground limiting end are located at the junction of the isolation limiting arc groove and the ground limiting arc groove. An upward protruding part is provided at the junction. The protruding part is used to prevent the isolation transmission rod from sliding into the ground limiting arc groove and to prevent the ground transmission rod from sliding into the isolation limiting arc groove.

8. A three-station mechanism according to claim 5, characterized in that: The isolation limiting terminals are respectively set as the first isolation limiting terminal and the second isolation limiting terminal, the two ends of the isolation arc groove are set as the first isolation arc groove end and the second isolation arc groove end, the grounding limiting terminals are respectively set as the first grounding limiting terminal and the second grounding limiting terminal, the two ends of the grounding arc groove are set as the first grounding arc groove end and the second grounding arc groove end, the three-position switch is in the isolation state, the isolation transmission rod is located at the end of the first isolation arc groove, and the grounding transmission rod is located at the end of the first grounding arc groove.

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