A circuit breaker and disconnector linkage device for a pole-mounted circuit breaker

Abstract

The application discloses a circuit breaker and isolating switch linkage device for pole-mounted circuit breaker, wherein a main shaft rotates, and an insulating pull rod assembly is driven to move through a main shaft crank; a shift fork block in the insulating pull rod assembly pushes an isolating pin shaft in an isolating transmission assembly to move, and an isolating switch contact is driven to move through an isolating connecting rod and an isolating clamp; when an isolating limiting crank arm contacts a support, the isolating switch is closed to a position, the shift fork block is disengaged from the isolating pin shaft, and the isolating transmission assembly is no longer pushed. Through the connection relationship among the main shaft assembly, the insulating pull rod assembly, the isolating transmission assembly and a circuit breaker transmission assembly, the linkage of the circuit breaker and the isolating switch and the required action time interval of normal operation are realized, and the influence of the electric force of the isolating switch contact on the action of the circuit breaker is avoided. The application has the advantages of simple structure, small size, small number of components, high reliability and long service life.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of intelligent power distribution equipment, and more particularly, to a circuit breaker and isolating switch linkage device for pole-mounted circuit breakers. BACKGROUND

[0002] With the comprehensive promotion of smart grid construction, higher requirements are put forward for the reliability and safety of power distribution equipment. As a widely used power distribution equipment in urban power distribution networks, pole-mounted circuit breakers can be used to open and close load currents, overload currents and short-circuit currents in power systems, and play an important role in the construction of power distribution networks.

[0003] The isolating switch assembly of the widely used pole-mounted circuit breaker ZW20 on the market is usually externally mounted, which leads to serious rusting, transmission difficulties, poor disconnection, porcelain bottle fracture, poor sealing and other problems under the influence of external environment, which poses a serious safety hazard to power operation.

[0004] The invention patent with the publication number CN109920690A and the name of a pole-mounted circuit breaker with built-in isolating switch proposes a built-in isolating switch solution, but does not realize the linkage between the circuit breaker and the isolating switch, cannot realize the reclosing function of the circuit breaker, and has poor practicability. The invention patent with the publication number CN112216550A and the name of a pole-mounted circuit breaker with built-in isolating switch realizes the linkage between the circuit breaker and the isolating switch, but in actual operation, there is a risk of isolating switch tripping under voltage due to the short interval between the actions of the circuit breaker and the isolating switch, and the action of the circuit breaker is affected due to the electric force of the isolating switch contact during tripping.

[0005] In order to solve the problems in the prior art, a circuit breaker and isolating switch linkage device for pole-mounted circuit breakers is urgently needed. SUMMARY

[0006] To solve the problems in the prior art, the purpose of the present application is to provide a circuit breaker and isolating switch linkage device for pole-mounted circuit breakers, which realizes the linkage between the circuit breaker and the isolating switch and the required action time interval for normal operation through the connection relationship between the main shaft assembly, the insulating pull rod assembly, the isolation transmission assembly and the circuit breaker transmission assembly, and avoids the influence of the electric force of the isolating switch contact on the action of the circuit breaker.

[0007] The present application adopts the following technical solutions.

[0008] A kind of circuit breaker and isolating switch linkage device for pole-mounted circuit breaker, including main shaft subassembly, insulating pull rod subassembly, isolation transmission subassembly and circuit breaker transmission subassembly;Wherein, main shaft subassembly is connected with insulating pull rod subassembly by main shaft crank arm;Insulating pull rod subassembly is connected with circuit breaker transmission subassembly by circuit breaker crank arm;Isolating switch subassembly is connected with insulating pull rod subassembly by isolation pin shaft in isolation transmission subassembly, isolation limit crank arm and fork block;

[0009] When closing, main shaft rotates, and insulating pull rod subassembly is moved by main shaft crank arm;Fork block in insulating pull rod subassembly promotes isolation pin shaft in isolation transmission subassembly to move, and isolating switch contact is moved by isolation connecting rod and isolation clamp, when isolation limit crank arm contacts with support, isolating switch is closed in place, and fork block and isolation pin shaft are disconnected, and isolation transmission subassembly is no longer pushed;

[0010] When opening, main shaft rotates in reverse direction, and insulating pull rod subassembly moves in reverse direction, and circuit breaker transmission subassembly moves in reverse direction under the action of contact spring of circuit breaker subassembly, when moving to a certain distance, circuit breaker subassembly arc is extinguished, and fork block pin in insulating pull rod subassembly promotes isolation limit crank arm in isolation transmission subassembly to move, so as to move isolating switch subassembly by isolation connecting rod and isolation clamp in isolation transmission subassembly, and isolating switch subassembly starts to open.

[0011] Further, when insulating pull rod subassembly promotes isolation transmission subassembly to move, circuit breaker crank arm is driven by fork block pin, and circuit breaker transmission subassembly is moved, so as to promote circuit breaker to close.

[0012] Further, main shaft subassembly includes main shaft, main shaft crank arm and main shaft pin, wherein main shaft crank arm passes through main shaft and is fixed by bolt, and main shaft crank arm is connected with insulating pull rod subassembly by main shaft pin.

[0013] Further, insulating pull rod subassembly includes insulating pull rod, left-handed pin, right-handed pin, fork block and fork block pin, left-handed pin is arranged at the upper end of insulating pull rod and is connected with insulating pull rod by thread, and right-handed pin is arranged at the lower end of insulating pull rod and is fixed by the same way as left-handed pin.

[0014] The screw rotation directions of left-handed pin and right-handed pin are left-handed and right-handed respectively, and the length of insulating pull rod is adjusted by the design of different screw rotation directions of left-handed pin and right-handed pin.

[0015] Right-handed pin, fork block pin and fork block are connected by welding, and fork block pin is located at the outside of fork block and is symmetrical to fork block left and right.

[0016] Further, the isolation transmission assembly comprises an isolation pin shaft, an isolation bushing, an isolation connecting rod, an isolation limiting elbow, and an isolation clamp; the isolation bushing is sleeved on both sides of the isolation pin shaft, the isolation connecting rod is sleeved on one side of the isolation pin shaft and the other side of the isolation clamp, and the axial position is limited by a clasp spring; the isolation limiting elbow is sleeved on the isolation pin shaft and located outside the isolation connecting rod, and the axial position is limited by a nut; the isolation clamp is sleeved on the isolation switch and used for pushing the isolation switch to close.

[0017] Further, the isolation bushing, the isolation connecting rod, and the isolation limiting elbow in the isolation transmission assembly are symmetrically arranged.

[0018] Further, the circuit breaker transmission assembly comprises a circuit breaker elbow, a groove wheel plate, a support, a guide block, a rotating shaft, a contact spring guide rod, a contact spring shaft pin, a contact spring cover plate, a flange, a large bearing, and a small bearing.

[0019] The guide block, the groove wheel plate, the circuit breaker elbow, and the isolation limiting elbow are sequentially installed on the rotating shaft from inside to outside, wherein the groove wheel plate and the circuit breaker elbow are synchronously connected with the rotating shaft, the large bearing is sleeved into the flange and is sleeved on both sides of the support, the guide block is connected with the support through a bolt, the contact spring guide rod and the contact spring cover plate are fixed through the contact spring shaft pin and are in contact with the groove wheel plate through the small bearings on both sides, and the circuit breaker elbow is connected with the fork block pin shaft through a through hole at one end.

[0020] Further, the groove wheel plate, the flange, the large bearing, the support, and the circuit breaker elbow in the circuit breaker transmission assembly are symmetrically arranged.

[0021] Further, the action time interval of the circuit breaker and the isolation switch is realized through the groove wheel plate in the circuit breaker transmission assembly, the fork block in the insulation pull rod assembly, and the isolation pin shaft in the isolation transmission assembly.

[0022] Further, the fork block arc design in the insulation pull rod assembly, the isolation limiting elbow in the isolation transmission assembly, and the support limiting position in the circuit breaker transmission assembly determine the moving stroke of the isolation switch.

[0023] The circuit breaker and isolation switch linkage device for a pole-mounted circuit breaker has the advantages that, compared with the prior art, the linkage device realizes the linkage of the circuit breaker and the isolation switch and the action time interval required for normal operation through the connection relationship among the main shaft assembly, the insulation pull rod assembly, the isolation transmission assembly, and the circuit breaker transmission assembly, thereby avoiding the influence of the electric force of the isolation switch contact on the action of the circuit breaker; meanwhile, the use of the rotating shaft and the bearings on the contact spring pin shaft in the circuit breaker transmission assembly reduces the friction resistance, improves the structural strength of the linkage device, and reduces the maintenance and use cost of the linkage device. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the overall assembly structure schematic view of the breaker and isolating switch linkage device for the pole-mounted circuit breaker of the application;

[0025] Figure 2 It is the structure schematic view of the main shaft assembly in the breaker and isolating switch linkage device for the pole-mounted circuit breaker of the application;

[0026] Figure 3 It is the structure schematic view of the insulation pull rod assembly in the breaker and isolating switch linkage device for the pole-mounted circuit breaker of the application;

[0027] Figure 4 It is the structure schematic view of the isolation transmission assembly in the breaker and isolating switch linkage device for the pole-mounted circuit breaker of the application;

[0028] Figure 5 It is the structure schematic view of the circuit breaker transmission assembly in the breaker and isolating switch linkage device for the pole-mounted circuit breaker of the application;

[0029] Figure 6 It is the overall assembly structure schematic view when the breaker and isolating switch linkage device for the pole-mounted circuit breaker of the application is in the breaking position;

[0030] Figure 7 It is the overall assembly structure schematic view when the breaker and isolating switch linkage device for the pole-mounted circuit breaker of the application is in the isolating switch just closing position;

[0031] Figure 8 It is the overall assembly structure schematic view when the breaker and isolating switch linkage device for the pole-mounted circuit breaker of the application is in the closing position;

[0032] Figure 9 It is the overall assembly structure schematic view when the breaker and isolating switch linkage device for the pole-mounted circuit breaker of the application is in the isolating switch just starting breaking action position.

[0033] Reference signs:

[0034] 1-main shaft assembly, 2-insulation pull rod assembly, 3-isolation transmission assembly, 4-circuit breaker transmission assembly;

[0035] 11-main shaft, 12-main shaft crank, 13-main shaft pin shaft;

[0036] 21-left-handed pin rod, 22-insulation pull rod, 23-right-handed pin rod, 24-yoke block, 25-yoke block pin shaft;

[0037] 31-isolation limiting crank, 32-locking nut, 33-isolation bushing, 34-isolation connecting rod, 35-isolation clamp, 36-isolation pin shaft;

[0038] 41-Contact spring guide rod, 42-Contact spring cover plate, 43-Small bearing, 44-Contact spring shaft pin, 45-Guide block, 46-Gateway plate, 47-Flange, 48-Large bearing, 49-Rotating shaft, 50-Bracket, 51-Circuit breaker crank arm;

[0039] 52-Circuit breaker assembly, 53-Disconnecting switch assembly, 54-Stationary contact. Detailed Implementation

[0040] The present application will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, and should not be construed as limiting the scope of protection of the present application.

[0041] Figure 1 This is a schematic diagram of the overall assembly structure of a linkage device between a circuit breaker and a disconnecting switch for a pole-mounted circuit breaker according to the present invention. Figure 1 As shown, a linkage device for a pole-mounted circuit breaker and a disconnecting switch includes a main shaft assembly 1, an insulating pull rod assembly 2, an isolation transmission assembly 3, and a circuit breaker transmission assembly 4. The main shaft assembly 1 is connected to the insulating pull rod assembly 2; the insulating pull rod assembly 2 is connected to the circuit breaker transmission assembly 4; and the disconnecting switch assembly 3 is connected to the insulating pull rod assembly 2 to transmit force. Specifically, the main shaft assembly 1 is connected to the insulating pull rod assembly 2 via a main shaft crank arm 12; the insulating pull rod assembly 2 is connected to the circuit breaker transmission assembly 3 via a shift fork block 24; and the circuit breaker transmission assembly 4 is connected to the insulating pull rod assembly 2 via an isolation pin 36, an isolation limit crank arm 31, and the shift fork block 24.

[0042] Figure 2 This is a schematic diagram of the main shaft assembly in a linkage device for a pole-mounted circuit breaker and a disconnecting switch according to the present invention. Figure 2 As shown, the spindle assembly 1 comprises a spindle 11, a spindle crank arm 12, and a spindle pin 13. The spindle crank arm 12 has a hexagonal inner hole and fits onto the spindle 11 to form a radial fixation. At the same time, the spindle crank arm 12 is axially fixed by means of fastening screws or cotter pins.

[0043] Figure 3 This is a schematic diagram of the insulating tie rod assembly in a circuit breaker and disconnector linkage device for a pole-mounted circuit breaker according to the present invention. Figure 3As shown, the insulation pull rod assembly 2 includes an insulation pull rod 22, a left-handed pin rod 21, a right-handed pin rod 23, a yoke block 24, and a yoke block pin shaft 25. The left-handed pin rod 21 is arranged at the upper end of the insulation pull rod 22, is connected with the insulation pull rod 22 through threads, is locked by a nut, and is connected with the main shaft crank 12 through the main shaft pin shaft 13. The right-handed pin rod 23 is arranged at the lower end of the insulation pull rod 22, and the fixing mode is consistent with that of the left-handed pin rod 21. Since the thread rotation directions of the left-handed pin rod 21 and the right-handed pin rod 23 are left-handed and right-handed respectively, the length of the insulation pull rod assembly 22 can be adjusted by rotating the insulation pull rod 22 without disassembling the main shaft pin shaft 13, so that the installation and debugging efficiency is improved. The right-handed pin rod 23, the yoke block pin shaft 25, and the yoke block 24 are connected through welding respectively, wherein the yoke block pin shaft 25 is two, is arranged outside the yoke block 24, is symmetrically welded with respect to the yoke block 24, and the welding points are inside the yoke block 24. The welding process is selected to make the right-handed pin rod 23, the yoke block pin shaft 25, and the yoke block 24 form an integral whole, which is a main stress point of the linkage device, and the structural strength is ensured.

[0044] Figure 4 It is a structural schematic view of the isolation transmission assembly in the circuit breaker and isolating switch linkage device for the pole-mounted circuit breaker. Figure 4 As shown, the isolation transmission assembly 3 includes an isolation pin shaft 36, an isolation bushing 33, an isolation connecting rod 34, an isolation limiting crank 31, and an isolation clamp 35. The isolation bushing 33 is sleeved on both sides of the isolation pin shaft 36, the isolation bushing 33 forms a rolling friction force with the yoke block 24, the rolling friction force is greatly reduced compared with the sliding friction force formed by the direct contact between the isolation pin shaft 36 and the yoke block 24, and thus the friction resistance is reduced. The isolation connecting rod 34 is sleeved on one side of the isolation pin shaft 36 and on the other side of the isolation clamp 35, and is axially limited by a clasp spring. The isolation limiting crank 31 is sleeved on the isolation pin shaft 36 and is located outside the isolation connecting rod 34, and is axially limited by a nut 32. The isolation clamp 35 is sleeved on the isolating switch and is used to push the isolating switch to close. The isolation bushing, the isolation connecting rod, and the isolation limiting crank in the isolation transmission assembly are symmetrically arranged.

[0045] Figure 5 It is a structural schematic view of the circuit breaker transmission assembly in the circuit breaker and isolating switch linkage device for the pole-mounted circuit breaker. Figure 5As shown, the circuit breaker transmission assembly 4 includes a circuit breaker crank arm 51, a grooved wheel plate 46, a bracket 50, a guide block 45, a rotating shaft 49, a contact spring guide rod 41, a contact spring pin 44, a contact spring cover plate 42, a flange 47, a large bearing 48, and a small bearing 43. On the rotating shaft 49, from the inside out, the guide block 45, the grooved wheel plate 46, the flange 47, the large bearing 48, the bracket 50, the circuit breaker crank arm 51, and the isolation limiting crank arm 31 are installed sequentially. The grooved wheel plate 46 and the circuit breaker crank arm 51 are synchronously connected to the rotating shaft 49. The large bearing 48 is fitted into the flange 47 and together they are fitted onto both sides of the bracket 50. The guide block 45 is connected to the bracket 50 by fastening screws or cotter pins. The contact spring guide rod 41 and the contact spring cover plate 42 are fixed by the contact spring pin 44 and use small bearings 43 on both sides to contact the grooved wheel plate 46. The use of bearings greatly reduces frictional resistance. The grooved wheel plate 46, flange 47, large bearing 48, bracket 50, and circuit breaker crank arm 51 are all symmetrically arranged. The circuit breaker crank arm 51 is connected to the shift fork block pin 25 through a through hole at one end.

[0046] Figure 6 , Figure 7 , Figure 8 , Figure 9 These are schematic diagrams of the overall assembly structure of the circuit breaker and disconnector linkage device for a pole-mounted circuit breaker according to the present invention, showing the circuit breaker in the open position, the disconnector just closed, the closed position, and the disconnector just beginning its open operation. Figure 6 , Figure 7 , Figure 8 , Figure 9 As shown, these represent the four states of operation of the circuit breaker and disconnector linkage device.

[0047] like Figure 6 As shown, when the linkage device is in the open position and the closing operation begins, the main shaft 11 rotates clockwise (viewed from the left side of the view). Through the connection between the main shaft crank arm 12, the main shaft pin 13, and the right-hand rotating pin 23 within the insulating pull rod assembly 2, it drives the insulating pull rod assembly 2 to move. The shift fork block 24 within the insulating pull rod assembly 2 pushes the isolation pin 36 within the isolation transmission assembly 3 to move, which in turn drives the disconnecting switch assembly 53 to move closer to the stationary contact 54 via the isolation connecting rod 34 and the isolation clamp 35. Simultaneously, as the insulating pull rod assembly 2 pushes the isolation transmission assembly 3 to move, the shift fork block pin 25 within the insulating pull rod assembly 2 drives the circuit breaker crank arm 51 within the circuit breaker transmission assembly 4 to move, thereby pushing the circuit breaker assembly 52 to the closing position.

[0048] like Figure 7 As shown, when Figure 6 The indicated action continues until it reaches... Figure 7When the isolation limit crank arm 31 contacts the bracket 50, the isolation switch assembly 53 is closed and engaged with the stationary contact 54. At this time, the arc design of the shift fork block 24 disengages the shift fork block 24 from the isolation pin 36 and no longer pushes the isolation linkage 34 and the isolation clamp 35.

[0049] While the insulating pull rod assembly 2 pushes the isolation transmission assembly 3 to move, the fork block pin 25 in the insulating pull rod assembly drives the circuit breaker crank arm 51 in the circuit breaker transmission assembly 4 to move, thereby pushing the circuit breaker to close.

[0050] The arc design of the fork block 24 in the insulating pull rod assembly 2, the isolation limit crank arm 31 in the isolation transmission assembly 3, and the limit position of the bracket 50 in the circuit breaker transmission assembly 4 determine the travel of the disconnecting switch.

[0051] like Figure 8 As shown, when Figure 7 The indicated action continues until it reaches... Figure 8 When the circuit breaker assembly 52 is in the closed position, the closing time interval between it and the disconnecting switch assembly 53 is achieved through the arc of the slotted wheel plate 46 in the circuit breaker drive assembly 4, the arc of the shift fork block 24 in the insulating pull rod assembly 2, and the isolation pin 36 in the disconnecting drive assembly 3. When the circuit breaker is open, the main shaft rotates counterclockwise (viewed from the left side of the view), driving the insulating pull rod assembly 2 to move in the opposite direction, and under the action of the contact spring of the circuit breaker assembly 52, the circuit breaker drive assembly 4 moves in the opposite direction.

[0052] like Figure 9 As shown, when along Figure 8 The indicated action continues until it reaches... Figure 9 When the circuit breaker assembly 52 is in the correct position, the fork block pin 25 in the insulating pull rod assembly 2 drives the isolation limit crank arm 31 in the isolation transmission assembly 3 to move, thereby driving the disconnecting switch assembly 53 to start opening through the isolation connecting rod 34 and isolation clamp 35 in the disconnecting switch assembly 3, until the desired position is reached. Figure 6 The position shown is the open position.

[0053] After the circuit breaker assembly 52 extinguishes the arc, the disconnector assembly 3 begins to open, thus preventing the stationary contact 54 from being held by the electrodynamic force of the disconnector contacts, which would prevent the circuit breaker from operating normally.

[0054] The beneficial effect of the present application is that, compared with the prior art, the circuit breaker and isolating switch linkage device for a pole-mounted circuit breaker in the present application realizes the linkage of the circuit breaker and the isolating switch and the required action time interval of normal operation through the connection relationship among the main shaft assembly, the insulating pull rod assembly, the isolating transmission assembly and the circuit breaker transmission assembly, thereby avoiding the influence of the isolating switch contact electric force on the action of the circuit breaker; meanwhile, the use of the rotating shaft and the bearing on the contact spring pin shaft in the circuit breaker transmission assembly reduces the friction resistance, improves the structural strength of the linkage device and reduces the maintenance and use cost of the linkage device.

[0055] The applicant of the present application has made detailed description and illustration on the embodiments of the present application in combination with the drawings of the specification, but the skilled in the art should understand that the above embodiments are only the preferred embodiments of the present application, and the detailed description is only for helping the readers to better understand the spirit of the present application, and is not a limitation on the protection scope of the present application, on the contrary, any improvement or modification based on the spirit of the present application should fall within the protection scope of the present application.

Claims

1. A circuit breaker and disconnector interlocking device for a pole-mounted circuit breaker, characterized in that, The device comprises a main shaft assembly (1), an insulating pull rod assembly (2), an isolation transmission assembly (3) and a circuit breaker transmission assembly (4); wherein the main shaft assembly (1) is connected with the insulating pull rod assembly (2) through a main shaft crank arm (12); the insulating pull rod assembly (2) is connected with the circuit breaker transmission assembly (4) through a circuit breaker crank arm (51); the isolating switch assembly (53) is connected with the insulating pull rod assembly (2) through the isolation transmission assembly (3) including an isolation pin shaft (36), an isolation limiting crank arm (31) and a fork block (24); When closing, the main shaft (11) in the main shaft assembly (1) rotates to drive the insulating pull rod assembly (2) to move through the main shaft crank arm (12); the fork block (24) in the insulating pull rod assembly (2) drives the isolation pin shaft (36) in the isolation transmission assembly (3) to move, and drives the isolating switch contact to move through the isolation connecting rod (34) and the isolation clamp (35); when the isolation limiting crank arm (31) contacts the support (50) in the circuit breaker transmission assembly (4), the isolating switch is closed to the position, the fork block (24) is separated from the isolation pin shaft (36) and no longer drives the isolation transmission assembly (3); When opening, the main shaft (11) rotates in the opposite direction to drive the insulating pull rod assembly (2) to move in the opposite direction, and the circuit breaker transmission assembly moves in the opposite direction under the action of the contact spring of the circuit breaker assembly (52); when the circuit breaker assembly (52) is extinguished after moving to a certain distance, the fork block pin shaft (25) in the insulating pull rod assembly (2) drives the isolation limiting crank arm (31) in the isolation transmission assembly (3) to move, thereby driving the isolating switch assembly (53) to start opening through the isolation connecting rod (34) and the isolation clamp (35) in the isolation transmission assembly (3); The time interval between the actions of the circuit breaker and the isolating switch is realized through the notch wheel plate (46) in the circuit breaker transmission assembly (4), the fork block (24) in the insulating pull rod assembly and the isolation pin shaft (36) in the isolation transmission assembly.

2. The circuit breaker and isolating switch linkage device for pole-mounted circuit breakers according to claim 1, characterized in that, When the insulating pull rod assembly (2) drives the isolation transmission assembly (3) to move, the fork block pin shaft (25) drives the circuit breaker crank arm (51) to drive the circuit breaker transmission assembly (4) to move, thereby driving the circuit breaker to close.

3. The circuit breaker and isolating switch linkage device for pole-mounted circuit breakers according to claim 1, characterized in that, The main shaft assembly (1) comprises a main shaft (11), a main shaft crank arm (12) and a main shaft pin shaft (13); wherein the main shaft crank arm (12) passes through the main shaft (11) and is fixed by bolts, and the main shaft crank arm (12) is connected with the insulating pull rod assembly (2) through the main shaft pin shaft (13).

4. The circuit breaker and isolating switch linkage device for pole-mounted circuit breakers according to claim 1, characterized in that, The insulating pull rod assembly (2) comprises an insulating pull rod (22), a left-handed pin rod (21), a right-handed pin rod (23), a yoke block (24) and a yoke block pin shaft (25); the left-handed pin rod (21) is arranged at the upper end of the insulating pull rod (22) and is connected with the insulating pull rod through threads; the right-handed pin rod (23) is arranged at the lower end of the insulating pull rod (22) and is fixed in the same way as the left-handed pin rod; The threads of the left-handed pin rod (21) and the right-handed pin rod (23) are left-handed and right-handed respectively; the lengths of the insulating pull rod (22) are adjusted through the design of the different threads of the left-handed pin rod and the right-handed pin rod; The right-handed pin rod (23), the yoke block pin shaft (25) and the yoke block (24) are connected through welding; the yoke block pin shaft (25) is arranged on the outer side of the yoke block (24) and is symmetrical to the yoke block (24) left and right.

5. The circuit breaker and isolating switch linkage device for pole-mounted circuit breakers according to claim 1, characterized in that The isolating transmission assembly (3) comprises an isolating pin shaft (36), an isolating bushing (33), an isolating connecting rod (34), an isolating limiting crank arm (31) and an isolating clamp (35); the isolating pin shaft (36) is sleeved with the isolating bushing (33) on both sides; the isolating connecting rod (34) is sleeved on the isolating pin shaft (36) on one side and is sleeved on the isolating clamp (35) on the other side and is axially limited by a clamping spring; the isolating limiting crank arm (31) is sleeved on the isolating pin shaft (36) and is located on the outer side of the isolating connecting rod (34) and is axially limited by a nut; the isolating clamp (35) is sleeved on the isolating switch and is used to push the isolating switch to close.

6. The circuit breaker and isolating switch linkage device for pole-mounted circuit breakers according to claim 5, characterized in that The isolating bushing (33), the isolating connecting rod (34) and the isolating limiting crank arm (31) in the isolating transmission assembly are symmetrically arranged.

7. The circuit breaker and isolating switch linkage device for pole-mounted circuit breakers according to claim 1, characterized in that The circuit breaker transmission assembly (4) comprises a circuit breaker crank arm (51), a grooved wheel plate (46), a bracket (50), a guide block (45), a rotating shaft (49), a contact spring guide rod (41), a contact spring shaft pin (44), a contact spring cover plate (42), a flange (47), a large bearing (48) and a small bearing (43); The guide block (45), the grooved wheel plate (46), the flange (47), the large bearing (48), the bracket (50), the circuit breaker crank arm (51) and the isolating limiting crank arm (31) are sequentially installed on the rotating shaft (49) from inside to outside, wherein the grooved wheel plate (46) and the circuit breaker crank arm (51) are synchronously connected with the rotating shaft (49), the large bearing (48) is sleeved into the flange (47) and is sleeved on both sides of the bracket (50) together; the guide block (45) is connected with the bracket (50) through bolts; the contact spring guide rod (41) and the contact spring cover plate (42) are fixed through the contact spring shaft pin (44) and are in contact with the grooved wheel plate (46) through small bearings (43) on both sides; the circuit breaker crank arm (51) is connected with the yoke block pin shaft (25) through a through hole at one end.

8. The circuit breaker and disconnector linkage device for pole-mounted circuit breakers according to claim 7, characterized in that, The groove wheel plate (46), flange (47), large bearing (48), bracket (50), circuit breaker crank (51) in the circuit breaker transmission assembly are symmetrically arranged.

9. The circuit breaker and disconnector linkage device for pole-mounted circuit breakers according to claim 1, characterized in that, The disconnector travel is determined by the arc design of the fork block (24) in the insulating pull rod assembly (2) and the position of the disconnector limiting crank (31) in the isolation transmission assembly (3) and the bracket (50) in the circuit breaker transmission assembly (4).

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