A three-position operating mechanism with high security

Abstract

A three-position operating mechanism with high security, comprising a mechanism panel, an operating device, a reduction gear set and a mechanism main shaft. The operating device is connected to the mechanism main shaft, and a reduction gear set is provided between the operating device and the mechanism main shaft. The operating device includes an electric operating device and a manual operating device, and a circuit breaker interlock device is provided on the mechanism main shaft. This three-position operating mechanism is equipped with two operating methods, electric and manual, and ensures the independence of the two working modes of electric operation and manual operation. At the same time, this three-position operating mechanism adopts a lead screw propulsion mechanism, avoiding the phenomenon of mechanical damage inside the mechanism caused by the vibration generated during the operation of the three-position operating mechanism.

Description

Technical Field

[0001] The invention belongs to the technical field of switchgear, and particularly relates to a three-position operating mechanism with high safety Background Art

[0002] Existing gas-insulated metal-enclosed switchgear usually adopts three-position operating technology. The so-called three positions refer to three working positions: (1) the closing position where the main disconnector contacts are connected; (2) the isolating position where the main contacts are separated; (3) the grounding position on the grounding side. Currently, the existing three-position operating mechanisms have the problems of large volume, complex transmission mode, redundant parts assembly processes, and high part processing difficulty. For the current three-position vacuum interrupter, a three-position operating mechanism with small volume, simple transmission mode, and strong operation reliability is needed Summary of the Invention

[0003] The purpose of the invention is to solve the deficiencies of the prior art and provide a three-position operating mechanism with high safety, which includes a mechanism panel, an operating device, a reduction gear set, and a mechanism main shaft. A manual rod insertion tube is provided on the mechanism panel. The operating device is connected to the mechanism main shaft, and a reduction gear set is arranged between the operating device and the mechanism main shaft. The operating device includes an electric operating device and a manual operating device. A circuit breaker interlock device is provided on the mechanism main shaft. The circuit breaker interlock device includes a circuit breaker interlock rod, a pawl, and a ratchet. The circuit breaker interlock rod is connected to one end of the pawl. The middle part of the pawl is sleeved on a cross column on a partition board. A convex block is provided at the bottom of the pawl, and the convex block cooperates with a groove on the ratchet. The ratchet is sleeved on the mechanism main shaft

[0004] Furthermore, the electric operating device includes a motor, a rotating cam, and a travel switch. The motor is connected to the mechanism main shaft through a clutch. The rotating cam is connected to a gear on the mechanism main shaft through a reduction gear set. A plurality of travel switches are arranged around the rotating cam, and the travel switches control the working state of the clutch

[0005] Furthermore, the manual operating device includes a manual rod connection seat fixed on a partition board. A rack is provided at one end of the manual rod connection seat. The rack is meshed and connected with the reduction gear set. The manual rod connection seat is connected to a gear on the mechanism main shaft through the rack and the reduction gear set. The position of the manual rod connection seat corresponds to the position of the manual rod insertion tube

[0006] Furthermore, an electromagnetic locking device is provided on the manual rod insertion tube. The electromagnetic locking device includes two upper and lower electromagnetic boxes. The electromagnetic boxes are connected to the travel switch. A movable iron core is provided in the middle of the electromagnetic box. Two upper and lower through holes for the iron core to pass through are provided on the manual rod insertion tube

[0007] Furthermore, a station display window is provided on the mechanism panel. A station display is provided at the station display window, and a closing indication of the earthing switch, a tripping indication of the earthing / isolation switch, and a closing indication of the isolation switch are provided on the station display.

[0008] Furthermore, the station display is connected to a number of auxiliary switches. The auxiliary switches are arranged in a ring around the auxiliary switch cam, and the auxiliary switch cam is connected to the rotating cam.

[0009] Furthermore, a torsion spring is provided between the pawl and the partition plate.

[0010] Furthermore, the main shaft of the mechanism is connected to a lead screw propulsion mechanism. The lead screw propulsion mechanism includes a lead screw and a ball nut sleeved on the lead screw. A locking device is provided at one end of the lead screw. The locking device includes a locking nut, a washer, and a bearing gland. A fixed earthing connector is provided in the middle of the lead screw, and an isolation switch connector is provided at the other end of the lead screw.

[0011] Furthermore, a sprocket is provided between the main shaft of the mechanism and the lead screw propulsion mechanism.

[0012] Beneficial effects: The present invention discloses a three-position operating mechanism with high safety. Compared with the existing three-position operating mechanisms, the present invention has the following advantages: (1) This three-position operating mechanism is equipped with both electric and manual operating modes, and the independence of the two working modes of electric operation and manual operation is ensured; (2) This three-position operating mechanism adopts a lead screw propulsion mechanism, avoiding the phenomenon of mechanical damage inside the mechanism caused by the vibration generated during the operation of the three-position operating mechanism. Description of the Drawings

[0013] Figure 1 is a schematic structural diagram of a three-position operating mechanism with high safety;

[0014] Figure 2 is a schematic structural diagram of the three-position operating mechanism after removing the mechanism panel;

[0015] Figure 3 is a side view of a three-position operating mechanism with high safety;

[0016] Figure 4 is a schematic structural diagram of the pawl;

[0017] Figure 5 is a schematic structural diagram of the ratchet wheel;

[0018] Figure 6 is the first connection mode (closing of the earthing switch) of the lead screw propulsion mechanism;

[0019] Figure 7It is the second connection method of the lead screw propulsion mechanism (grounding / isolation switch opening);

[0020] Figure 8 It is the third connection method of the lead screw propulsion mechanism (isolation switch closing);

[0021] In the figure: 1. Mechanism panel, 11. Manual rod insertion tube, 12. Electromagnetic box, 13. Station display window, 14. Auxiliary switch, 15. Auxiliary switch cam, 2. Operating device, 21. Electric operating device, 211. Motor, 212. Rotating cam, 213. Travel switch, 214. Clutch, 22. Manual operating device, 221. Manual rod connection seat, 222. Manual operating rod, 3. Reduction gear set, 4. Mechanism main shaft, 41. Gear, 5. Circuit breaker interlock device, 51. Circuit breaker interlock rod, 52. Pawl, 53. Ratchet wheel, 54. Torsion spring, 6. Partition board, 61. Cross column, 7. Lead screw propulsion mechanism, 71. Lead screw, 72. Ball nut, 73. Locking device, 731. Locking nut, 732. Washer, 733. Bearing gland, 74. Grounding connector, 75. Isolation switch connector, 8. Sprocket. Specific implementation

[0022] To deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0023] As Figures 1 to 8 shown, a three-position operating mechanism with high safety includes a mechanism panel 1, an operating device 2, a reduction gear set 3, and a mechanism main shaft 4. The operating device 2 is connected to the mechanism main shaft 4, and a reduction gear set 3 is provided between the operating device 2 and the mechanism main shaft 4. The operating device 2 includes an electric operating device 21 and a manual operating device 22. The electric operating device 21 includes a motor 211, a rotating cam 212, and a travel switch 213. The motor 211 is connected to the mechanism main shaft 4 through a clutch 214. The rotating cam 212 is connected to the gear 41 on the mechanism main shaft 4 through the reduction gear set 3. A plurality of travel switches 213 are provided around the rotating cam 212, and the travel switches 213 control the working state of the clutch 214. The manual operating device 22 includes a manual rod connection seat 221 fixed on the partition board 6. One end of the manual rod connection seat 221 is provided with a rack, and the rack is meshed and connected with the reduction gear set 3. The manual rod connection seat 221 is connected to the gear 41 on the mechanism main shaft 4 through the rack and the reduction gear set 3. The position of the manual rod connection seat 221 corresponds to the position of the manual rod insertion tube 11.

[0024] On the described mechanism panel 1, there is a manual rod insertion tube 11. An electromagnetic locking device is provided on the manual rod insertion tube 11. The electromagnetic locking device includes two upper and lower electromagnetic boxes 12. The electromagnetic boxes 12 are connected to the travel switch 213. In the middle of the electromagnetic box 12, there is an iron core that can move up and down. There are two upper and lower through holes on the manual rod insertion tube 11 for the iron core to pass through. A station display window 13 is also provided on the mechanism panel. A station display (not shown in the figure) is provided at the station display window 13. On the station display, there are a grounding switch closing mark, a grounding / disconnecting switch opening mark, and a disconnecting switch closing mark. The station display is connected to a number of auxiliary switches 14. The auxiliary switches 14 are placed in a ring around the auxiliary switch cam 15. The auxiliary switch cam 15 is connected to the rotating cam 212.

[0025] A circuit breaker interlocking device 5 is provided on the mechanism main shaft 4. The circuit breaker interlocking device 5 includes a circuit breaker interlocking rod 51, a pawl 52, and a ratchet wheel 53. One end of the circuit breaker interlocking rod 51 is connected to the pawl 52. The middle of the pawl 52 is sleeved on the cross column 61 on the partition plate 6. A torsion spring 54 is provided between the pawl 52 and the partition plate 6. There is a convex block at the bottom of the pawl 52, and the convex block cooperates with the groove on the ratchet wheel 53. The ratchet wheel 53 is sleeved on the mechanism main shaft 4. The mechanism main shaft 4 is connected to a lead screw propulsion mechanism 7. The lead screw propulsion mechanism 7 includes a lead screw 71 and a ball nut 72 sleeved on the lead screw 71. One end of the lead screw 71 is provided with a locking device 73. The locking device 73 includes a locking nut 731, a washer 732, and a bearing gland 733. A fixed grounding connector 74 is provided in the middle of the lead screw 71. The other end of the lead screw is provided with a disconnecting switch connector 75. A sprocket 8 is provided between the mechanism main shaft 4 and the lead screw propulsion mechanism 7.

[0026] Working condition: As Figures 1 to 8 shown, when the circuit breaker is tripped, the circuit breaker interlocking rod 51 is lifted. One end of the pawl 52 connected to the circuit breaker interlocking rod 51 is lifted by the circuit breaker interlocking rod 51. The convex block at the bottom of the pawl 52 is separated from the groove in the ratchet wheel 53, and the circuit breaker interlocking device 5 of the three-position operating mechanism fails. At this time, the three-position operation of the disconnecting switch can be carried out.

[0027] Electric operation condition: Taking the closing of the grounding switch as an example: When the circuit breaker interlocking device 5 fails, the motor 211 is turned on. The motor 211 drives the main shaft 4 to rotate. At this time, the lead screw propulsion mechanism 7 starts to work. The rotating cam 212 drives the auxiliary switch cam 15 to rotate simultaneously through the meshing action of the gear 41 and the reduction gear set 3. When the lead screw propulsion mechanism 7 reaches the grounding switch closing position (as Figure 6As shown in the figure, the contact of the travel switch 213 touches the rotating cam 212, controlling the clutch 214 to engage and disconnecting the power supply of the motor 211. The motor 211 stops rotating. Meanwhile, the contact of the auxiliary switch 14 touches the auxiliary switch cam 15, controlling the station display (not shown in the figure) to rotate. The grounding switch closing indication rotates to the station display window 13, reminding the operator that the three-position operating mechanism is in the grounding closing state at this time. It should be noted that during the entire electric operation process, the travel switch 213 controls the electromagnetic box 12 to be powered on. The iron cores in the upper and lower electromagnetic boxes 12 are attracted, and the inside of the manual rod insertion tube 11 is blocked. At this time, the electromagnetic locking device takes effect, and the operator cannot insert the manual operating rod 222 into the manual rod connecting seat 221 for manual operation.

[0028] Manual operation situation: Taking the grounding switch closing as an example: The operator inserts the manual operating rod 222 into the manual rod connecting seat 221 and rotates the manual operating rod 222. The rack at one end of the manual rod connecting seat 221 rotates and drives the rotating cam 212 and the main shaft 4 to rotate through the reduction gear set 3 and the gear 41. At this time, the lead screw propulsion mechanism 7 starts to work. When the lead screw propulsion mechanism 7 reaches the grounding switch closing position (as Figure 6 shown in the figure), the contact of the auxiliary switch 14 touches the auxiliary switch cam 15, controlling the station display (not shown in the figure) to rotate. The grounding switch closing indication rotates to the station display window 13, reminding the operator that the three-position operating mechanism is in the grounding closing state at this time. It should be noted that when the manual operating rod 222 is inserted into the manual rod connecting seat 221 for manual operation, the operator cannot turn on the motor 211 for electric operation.

[0029] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A three-station operating mechanism with high security, characterized in that It includes a mechanism panel, an operating device, a reduction gear set and a mechanism main shaft. A manual rod insertion tube is provided on the mechanism panel. The operating device is connected to the mechanism main shaft, and a reduction gear set is provided between the operating device and the mechanism main shaft. The operating device includes an electric operating device and a manual operating device. A circuit breaker interlock device is provided on the mechanism main shaft. The circuit breaker interlock device includes a circuit breaker linkage rod, a pawl and a ratchet wheel. The circuit breaker linkage rod is connected to one end of the pawl. The middle of the pawl is sleeved on a cross column on a partition plate. A convex block is provided at the bottom of the pawl, and the convex block is matched with a groove on the ratchet wheel. The ratchet wheel is sleeved on the mechanism main shaft; The electric operating device includes a motor, a rotating cam and a travel switch. The motor is connected to the mechanism main shaft through a clutch. The rotating cam is connected to a gear on the mechanism main shaft through a reduction gear set. A plurality of travel switches are provided around the rotating cam, and the travel switches control the working state of the clutch; The manual operating device includes a manual rod connecting seat fixed on the partition plate. A rack is provided at one end of the manual rod connecting seat. The rack is meshed and connected with the reduction gear set. The manual rod connecting seat is connected to a gear on the mechanism main shaft through the rack and the reduction gear set. The position of the manual rod connecting seat corresponds to the position of the manual rod insertion tube.

2. The three-station operating mechanism with high security according to claim 1, characterized in that, An electromagnetic locking device is provided on the manual rod insertion tube. The electromagnetic locking device includes two upper and lower electromagnetic boxes. The electromagnetic boxes are connected to the travel switch. A movable iron core is provided in the middle of the electromagnetic box. Two upper and lower through holes for the iron core to pass through are provided on the manual rod insertion tube.

3. A three-station operating mechanism with high security according to claim 1, characterized in that, A station display window is also provided on the mechanism panel. A station display is provided at the station display window. A grounding switch closing indication, a grounding / disconnecting switch opening indication and a disconnecting switch closing indication are provided on the station display.

4. The three-station operating mechanism with high security according to claim 3, characterized in that The station display is connected to a plurality of auxiliary switches. The auxiliary switches are annularly arranged around an auxiliary switch cam, and the auxiliary switch cam is connected to the rotating cam.

5. A three-station operating mechanism with high security according to claim 1, characterized in that, A torsion spring is provided between the pawl and the partition plate.

6. A three-station operating mechanism with high security according to claim 1, characterized in that, The mechanism main shaft is connected to a lead screw propulsion mechanism. The lead screw propulsion mechanism includes a lead screw and a ball nut sleeved on the lead screw. A locking device is provided at one end of the lead screw. The locking device includes a locking nut, a washer and a bearing gland. A fixed grounding connector is provided in the middle of the lead screw, and a disconnecting switch connector is provided at the other end of the lead screw.

7. A three-station operating mechanism with high security according to claim 1, characterized in that A sprocket is provided between the mechanism main shaft and the lead screw propulsion mechanism.

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