A cam mechanical interlock device for pole-mounted circuit breakers

Abstract

The utility model relates to the technical field of power application equipment, provide a cam mechanical interlock device of pole circuit breaker, include: the isolation insulating casing, the isolation static contact, the isolation dynamic contact, the isolation contact seat, the insulating pull rod, the control box, the isolation operation main shaft, the elbow board, the connecting plate, the cam, the gyro wheel, the lever, the transmission assembly, the locking block, when the gyro wheel with the wheel surface contact of cam, the locking block just unblocks circuit breaker operation switch, when the gyro wheel with the arc groove contact, the locking block just locks circuit breaker operation switch. Advantage: the opening and closing action between the isolation static contact and the isolation dynamic contact is in the isolation insulating casing, the structure is unique and exquisite, the isolation insulating casing plays the role of the isolation sundries of outside, avoids the opening and closing action of the isolating switch to be interfered with by sundries, improves stability and security, under the condition that the closing of isolating switch is not in place or the opening is not in place, avoids the circuit breaker operation switch to be triggered mistakenly.

Description

Technical Field

[0001] This utility model relates to the field of power application equipment technology, specifically to a cam mechanical interlocking device for pole-mounted circuit breakers. Background Technology

[0002] A pole-mounted circuit breaker (POP) is a high-voltage electrical device installed and operated on a utility pole, primarily used in outdoor power distribution systems. POP breakers control and protect power distribution networks, automatically disconnecting the circuit in case of faults, such as overloads or short circuits. Equipped with a vacuum interrupter, it safely disconnects the circuit when current flows through, preventing arcing damage to equipment or fires. The vacuum interrupter is also known as a vacuum switch tube. The circuit breaker operating switch allows operators to manually open and close the vacuum interrupter. POP breakers are used in conjunction with disconnecting switches. The disconnecting switch is manually operated and primarily used for circuit isolation and maintenance; it provides a clear disconnection indicator to ensure safety during maintenance.

[0003] Traditional pole-mounted circuit breakers use disconnectors with knife-switch structures, which are exposed and easily accumulate debris. This makes the opening and closing actions of the disconnector susceptible to interference, resulting in lower stability and safety. For example, utility model patent document CN218866977U discloses a novel interlocking structure ZW32-12 pole-mounted vacuum circuit breaker integrated disconnector, comprising a base, operating shaft, crank arm, insulating pull rod, insulating support, moving contact, stationary contact, and conductive clamp. The base is fixed to one side of the circuit breaker housing, the insulating support is fixedly mounted on the base, the stationary contact is fixedly mounted on the upper end of the insulating support, one end of the moving contact is connected to the circuit breaker output terminal via the conductive clamp, and the other end engages with the stationary contact. One end of the insulating pull rod is connected to the moving contact, and the other end is connected to the crank arm on the operating shaft. The operating shaft has an opening / closing handle at its end, allowing for manual operation of the handle to open and close the circuit. The disconnecting switch in this patent document is a knife switch structure, which is exposed.

[0004] Traditional pole-mounted circuit breakers also have the following drawbacks: When the moving and stationary contacts of the disconnecting switch are opened or closed by manually operating the opening and closing handle, if the disconnecting switch is not closed or opened properly, the circuit breaker operating switch may be accidentally triggered, causing the vacuum interrupter to close. This can easily lead to safety hazards and does not comply with the operating specifications of pole-mounted circuit breakers.

[0005] Therefore, in order to prevent the circuit breaker operating switch from being accidentally triggered and causing the vacuum interrupter to close when the disconnecting switch is not in the closing or opening position, there is an urgent need in this technical field for a cam mechanical interlocking device for pole-mounted circuit breakers. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a cam mechanical interlocking device for a pole-mounted circuit breaker.

[0007] The technical solution of this utility model is implemented as follows: a cam-driven mechanical interlocking device for a pole-mounted circuit breaker, comprising: Insulating housing, stationary contact, moving contact, contact seat, insulating rod, control box, operating spindle, crank plate, connecting plate, cam, roller, lever, transmission assembly, locking block; The isolating stationary contact is fixedly connected to the top of the isolating insulating housing. A gate groove is provided at the lower end of the isolating stationary contact. The isolating contact seat is fixedly connected to the interior of the isolating insulating housing. A guide hole is provided in the isolating contact seat. The isolating moving contact is slidably connected to the guide hole. The lower end of the isolating moving contact is fixedly connected to the upper end of the insulating pull rod. The upper end of the isolating moving contact can be inserted into the gate groove. The isolating insulating housing is fixedly connected to the control box. The bottom of the isolating insulating housing communicates with the control box. The isolation operation spindle is rotatably connected to the control box, which is located inside the control box. One end of the crank plate is fixedly connected to the isolation operation spindle, and the other end of the crank plate is hinged to the lower end of the connecting plate. The upper end of the connecting plate is hinged to the lower end of the insulating pull rod. The center of the cam is fixedly connected to the isolation operation spindle, and the cam's wheel surface is provided with an arc-shaped groove. The short section of the lever is rotatably connected to the roller, and the long section of the lever is connected to one end of the locking block via a transmission assembly. A torsion spring is provided between the fulcrum of the lever and the control box. The other end of the locking block is hinged to the control box. When the roller contacts the wheel surface of the cam, the locking block unlocks the circuit breaker operating switch. When the roller contacts the arc-shaped groove, the locking block locks the circuit breaker operating switch.

[0008] Furthermore, the cam is provided with a stop.

[0009] Furthermore, the cam mechanical interlocking device also includes a limiting angle plate, which is fixedly connected to the control box. When the disconnecting switch is closed, the stop block abuts against the limiting angle plate.

[0010] Furthermore, the transmission assembly includes a bridge rod, a swing arm, and a push-pull rod. The long section of the lever is hinged to one end of the bridge rod, the other end of the bridge rod is hinged to one end of the swing arm, the other end of the swing arm is hinged to the control box, one end of the push-pull rod is hinged to one end of the swing arm, and the other end of the push-pull rod is hinged to one end of the locking block.

[0011] Furthermore, it also includes: a first conductive plate and a second conductive plate, the upper end of the isolating stationary contact is connected to the first wiring block through the first conductive plate, the surface of the isolating insulating housing is provided with a second wiring block, and the isolating contact seat is connected to the second wiring block through the second conductive plate.

[0012] Furthermore, the isolating contact seat is a split-type isolating contact seat, including a guide tube, a fixing plate, a sealing seat, and a spring contact finger. One end of the fixing plate is disposed between the guide tube and the sealing seat, and the other end of the fixing plate is provided with a mounting hole. The mounting hole is locked to the isolating insulating housing by screws. The guide tube is located below the sealing seat. The sealing seat has an annular groove inside, and the spring contact finger is installed in the annular groove. The isolating moving contact passes through the guide tube and the sealing seat. The other end of the fixing plate is also connected to the second wiring block through the second conductive plate.

[0013] Furthermore, an isolation operation handle is provided on the outside of the control box, and the control box is provided with a rotating hole. The isolation operation handle passes through the rotating hole and is fixedly connected to the isolation operation spindle.

[0014] Compared with the prior art, the beneficial effects or advantages of this utility model are as follows: the opening and closing actions between the isolating stationary contact and the isolating moving contact occur within the isolating insulating shell. The isolating moving contact moves linearly with the aid of the isolating contact seat. The structure is unique and ingenious. The isolating insulating shell isolates external debris, preventing interference with the opening and closing actions of the disconnecting switch, thus improving stability and safety. In cases where the disconnecting switch is not fully closed or opened, it prevents accidental triggering of the circuit breaker operating switch, thus avoiding closing the vacuum interrupter (i.e., the vacuum switch).

[0015] The vacuum switch and the isolating switch are locked by a cam-driven mechanical interlocking device. When the vacuum switch is in the closed state, this invention prevents the isolating switch from being accidentally closed when it is in the open state; and it also prevents the isolating switch from being accidentally opened when it is in the closed state. When the isolating switch is not properly closed or not properly opened, this invention prevents the vacuum switch from being accidentally closed manually. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a three-dimensional schematic diagram of the external structure of the circuit breaker body, control box, and disconnecting switch device of this utility model.

[0018] Figure 2 This is a front plan view of the circuit breaker body, control box, and disconnecting switch device of this utility model.

[0019] Figure 3 yes Figure 2 Top view.

[0020] Figure 4 yes Figure 2 The left view.

[0021] Figure 5 yes Figure 4 A cross-sectional view along the AA direction.

[0022] Figure 6 yes Figure 5 A schematic diagram of the insertion of the moving isolating contact into the slot of the stationary isolating contact.

[0023] Figure 7 This is a three-dimensional schematic diagram of the external structure of the isolation contact seat of this utility model.

[0024] Figure 8 This is a schematic cross-sectional view of the internal structure of the isolation contact seat of this utility model.

[0025] Figure 9 This is a schematic cross-sectional view of the connection between the isolating moving contact and the insulating pull rod of this utility model.

[0026] Figure 10 This is a schematic diagram of the internal structure of the control box of this utility model.

[0027] Figure 11 yes Figure 10 Enlarged schematic diagram of the cam mechanical interlocking device.

[0028] Figure 12 This is a schematic diagram showing the connection of the isolation operation spindle, cam, and roller of this utility model.

[0029] Figure 13 This is a schematic diagram of the locking block locking the circuit breaker operating switch of this utility model.

[0030] Reference numerals: Circuit breaker body 1; Control box 11; Isolation operation spindle 111; Turning plate 112; Connecting plate 113; Isolation operation handle 114; Circuit breaker operating switch 115; Vacuum switch operating mechanism 116; Limiting spindle 117; Vacuum interrupter 12; First terminal block 13; Isolation switch device 2; Isolation insulating housing 21; Observation window 211; Second terminal block 212; Isolation stationary contact 22; Gate slot 221; Isolation moving contact 23; Isolation contact seat 24; Guide tube 241; Fixing plate 242; Sealing seat 243; Annular groove 2431; First conductive plate 25; Second conductive plate 26; Insulating pull rod 27; Cam mechanical interlocking device 3; Cam 31; Arc groove 311; Stop block 312; Roller 32; Lever 33; Bridge rod 34; Swing arm 35; Push-pull rod 36; Locking block 37; Limiting angle plate 38. Detailed Implementation

[0031] This utility model provides a cam mechanical interlocking device for a pole-mounted circuit breaker. The purpose of the cam mechanical interlocking device is to prevent the circuit breaker operating switch from being accidentally triggered to close the vacuum interrupter when the disconnecting switch is not in the closed or open position. The device is set inside the isolation insulation shell to effectively prevent interference from external debris.

[0032] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0033] See Figures 1 to 13 The preferred embodiment of this utility model.

[0034] A cam-driven mechanical interlocking device for a pole-mounted circuit breaker includes: 21. Isolating insulating housing, 22. Isolating stationary contact, 23. Isolating moving contact, 24. Isolating contact seat, 27. Insulating pull rod, 11. Control box, 111. Isolating operating spindle, 112. Crank plate, 113. Connecting plate, 31. Cam, 32. Roller, 33. Lever, transmission assembly, 37. The isolating stationary contact 22 is fixedly connected to the top of the isolating insulating housing 21. The lower end of the isolating stationary contact 22 is provided with a gate groove 221. The isolating contact seat 24 is fixedly connected to the interior of the isolating insulating housing 21. The isolating contact seat 24 is provided with a guide hole. The isolating moving contact 23 is slidably connected to the guide hole. The lower end of the isolating moving contact 23 is fixedly connected to the upper end of the insulating pull rod 27. The upper end of the isolating moving contact 23 can be inserted into the gate groove 221. The isolating insulating housing 21 is fixedly connected to the control box 11. The bottom of the isolating insulating housing 21 communicates with the control box 11. The isolation operation spindle 111 is rotatably connected to the control box 11, and the isolation operation spindle 111 is inside the control box 11. One end of the crank plate 112 is fixedly connected to the isolation operation spindle 111, and the other end of the crank plate 112 is hinged to the lower end of the connecting plate 113. The upper end of the connecting plate 113 is hinged to the lower end of the insulating pull rod 27. The center of the cam 31 is fixedly connected to the isolation operation spindle 111, and the wheel surface of the cam 31 is provided with an arc-shaped groove 311. The lever 3... The short section of the lever 33 is rotatably connected to the roller 32, and the long section of the lever 33 is connected to one end of the locking block 37 through a transmission assembly. A torsion spring is provided between the fulcrum of the lever 33 and the control box 11. The other end of the locking block 37 is hinged to the control box 11. When the roller 32 contacts the wheel surface of the cam 31, the locking block 37 unlocks the circuit breaker operating switch 115. When the roller 32 contacts the arc-shaped groove 311, the locking block 37 locks the circuit breaker operating switch 115.

[0035] The beneficial effects or advantages of this utility model are as follows: The opening and closing actions between the isolating stationary contact 22 and the isolating moving contact 23 occur within the isolating insulating shell 21. The isolating moving contact 23 moves linearly with the aid of the isolating contact seat 24. The structure is unique and ingenious. The isolating insulating shell 21 isolates external debris, preventing interference with the opening and closing actions of the isolating switch, thus improving stability and safety. In cases where the isolating switch is not fully closed or fully open, it prevents the circuit breaker operating switch 115 from being accidentally triggered, causing the vacuum interrupter (i.e., the vacuum switch) to close. The vacuum switch and the isolating switch are locked by the cam mechanical interlocking device 3. When the vacuum switch is closed, this utility model prevents the isolating switch from being accidentally closed in the open state; and also prevents the isolating switch from being accidentally opened in the closed state. When the isolating switch is not fully closed or fully open, this utility model prevents accidental manual closing of the vacuum switch.

[0036] When the isolation operation spindle 111 rotates in the forward direction, the isolation moving contact 23 rises vertically and inserts into the gate slot 221 of the isolation stationary contact 22 through the transmission action of the crank plate 112, connecting plate 113, and insulating pull rod 27, thus performing a closing action; when the isolation operation spindle 111 rotates in the reverse direction, the isolation moving contact 23 falls vertically and disengages from the gate slot 221 of the isolation stationary contact 22 through the transmission action of the crank plate 112, connecting plate 113, and insulating pull rod 27, thus performing a opening action.

[0037] Furthermore, the cam 31 is provided with a stop 312.

[0038] The vacuum interrupter 12, also known as a vacuum switch, has an operating mechanism 116 located inside the control box 11. The circuit breaker operating switch 115 is connected to the vacuum switch operating mechanism 116 via a rotating shaft. The open / closed state of the circuit breaker operating switch 115 is transmitted to the vacuum switch operating mechanism 116, which then drives the vacuum switch to open and close. The circuit breaker operating switch 115 has a handle structure for manual operation. The vacuum switch operating mechanism 116 is existing technology.

[0039] Combination Figure 5 When the disconnecting switch is in the open position, the roller 32 is located on the wheel surface of the cam 31 and to the right of the arc-shaped groove 311, and the torsion spring is in a deformed state; combined with Figure 6When the disconnecting switch is closed, the roller 32 is located on the wheel surface of the cam 31 and to the left of the arc-shaped groove 311, and the torsion spring is in a deformed state. When the disconnecting switch is not closed or not open, the torsion spring resets and the roller 32 is located in the arc-shaped groove 311. At this time, the force transmitted by the lever 33 and the transmission component causes the locking block 37 to lock the circuit breaker operating switch 115, thereby preventing manual accidental closing of the vacuum switch. That is, at this time, it prevents the operator from switching the vacuum switch from the open state to the closed state through the circuit breaker operating switch.

[0040] The vacuum switch operating mechanism 116 has a limiting spindle 117, and the cam 31 is provided with a stop block 312. When the circuit breaker operating switch 115 puts the vacuum switch in the closed state through the vacuum switch operating mechanism 116, the vacuum switch operating mechanism 116 simultaneously moves the limiting spindle 117 forward. Figure 11 When the limiting spindle 117 moves downward, it blocks the stop block 312. Consequently, the cam 31 and the isolating operating spindle 111 cannot rotate forward, meaning the isolating switch device 2 cannot close, and the isolating switch cannot change from its open state to its closed state. Similarly, because the stop block 312 is blocked by the limiting spindle 117, the cam 31 and the isolating operating spindle 111 cannot rotate in the reverse direction, meaning the isolating switch device 2 cannot open, and the isolating switch cannot change from its closed state to its open state. When the circuit breaker operating switch 115 puts the vacuum switch in the open state through the vacuum switch operating mechanism 116, the vacuum switch operating mechanism 116 simultaneously retracts the limiting spindle 117. Figure 11 When the limiting spindle 117 moves upward, it avoids the stop block 312, allowing the cam 31 and the isolation operation spindle 111 to complete their rotation.

[0041] Therefore, when the vacuum switch is in the closed state, this invention prevents the disconnector switch from being accidentally closed when it is in the open state; and it also prevents the disconnector switch from being accidentally opened when it is in the closed state. When the disconnector switch is not properly closed or not properly opened, this invention prevents the vacuum switch from being accidentally closed manually. This helps improve safety.

[0042] Operating procedures for pole-mounted circuit breakers: When disconnecting, first disconnect the vacuum switch (vacuum interrupter), then disconnect the isolating switch; when closing, first close the isolating switch, then close the vacuum switch (vacuum interrupter).

[0043] Furthermore, the cam mechanical interlocking device 3 also includes a limiting angle plate 38, which is fixedly connected to the control box 11. When the disconnecting switch device 2 is closed, the stop block 312 abuts against the limiting angle plate 38.

[0044] The beneficial effects of this technical solution are: when the stop block 312 abuts against the limiting angle plate 38, it prevents the cam 31 from continuing to rotate, thereby stopping the rotation of the isolation operation spindle 111, avoiding excessive compression of the isolation stationary contact 22 by the isolation moving contact 23, and preventing damage.

[0045] Furthermore, the transmission assembly includes a bridge rod 34, a swing arm 35, and a push-pull rod 36. The long section of the lever 33 is hinged to one end of the bridge rod 34, the other end of the bridge rod 34 is hinged to one end of the swing arm 35, the other end of the swing arm 35 is hinged to the control box 11, one end of the push-pull rod 36 is hinged to one end of the swing arm 35, and the other end of the push-pull rod 36 is hinged to one end of the locking block 37.

[0046] The beneficial effects of this technical solution are: the force transmission between the bridge rod 34, the swing arm 35, and the push-pull rod 36 allows for appropriate adjustment of the distance between the locking block 37 and the roller 32, making it easier to flexibly set the position of the locking block 37.

[0047] Furthermore, it also includes: a first conductive plate 25 and a second conductive plate 26, the upper end of the isolating stationary contact 22 is connected to the first wiring block 13 through the first conductive plate 25, the surface of the isolating insulating housing 21 is provided with a second wiring block 212, and the isolating contact seat 24 is connected to the second wiring block 212 through the second conductive plate 26.

[0048] The interior of the vacuum interrupter 12 houses the moving and stationary contacts of the circuit breaker, which is existing technology. A first terminal block 13 is located on the top of the vacuum interrupter 12; after the disconnecting switch 2 closes, the first terminal block 13 and the second terminal block 212 can be energized. The second terminal block 212 is used to connect to an external power source. There are three vacuum interrupters 12 and three disconnecting switch 2 units, each used to connect to three-phase power.

[0049] Furthermore, the isolating contact seat 24 is a split isolating contact seat 24, including a guide tube 241, a fixing plate 242, a sealing seat 243, and a spring contact finger. One end of the fixing plate 242 is disposed between the guide tube 241 and the sealing seat 243, and the other end of the fixing plate 242 is provided with a mounting hole. The mounting hole is locked to the isolating insulating housing 21 by screws. The guide tube 241 is located below the sealing seat 243. The sealing seat 243 is provided with an annular groove 2431 inside. The spring contact finger is installed in the annular groove 2431. The isolating moving contact 23 passes through the guide tube 241 and the sealing seat 243. The other end of the fixing plate 242 is also connected to the second wiring block 212 through the second conductive plate 26.

[0050] The beneficial effects of this technical solution are: it facilitates the assembly of the isolating contact seat 24 onto the isolating insulating housing 21 by the operators, thus improving assembly efficiency. Specifically, the sealing seat 243 has two annular grooves 2431 inside, each housing a spring-loaded contact finger. Through the radial deformation of the spring-loaded contact fingers, an effective conductive connection is maintained between the sealing seat 243 and the isolating moving contact 23.

[0051] Furthermore, an isolation operation handle 114 is provided on the outside of the control box 11, and the control box 11 is provided with a rotating hole. The isolation operation handle 114 passes through the rotating hole and is fixedly connected to the isolation operation spindle 111.

[0052] The beneficial effects of this technical solution are: it facilitates the operation of the isolation moving contact 23 and the isolation stationary contact 22 by the operator using the isolation operating handle 114 to drive the isolation operating spindle 111.

[0053] The insulating housing 21 is provided with an observation window 211, which is located between the insulating stationary contact 22 and the insulating contact seat 24. The observation window 211 has a transparent plate, and a sealing ring is provided between the transparent plate and the insulating housing 21. The transparent plate is a tempered glass plate.

[0054] This utility model discloses a cam-driven mechanical interlocking device 3 for a pole-mounted circuit breaker, applied to the pole-mounted circuit breaker. The circuit breaker body 1 includes a control box 11 and a vacuum interrupter 12. The bottom of the vacuum interrupter 12 is fixedly connected to the control box 11, and a first terminal block 13 is provided on the top of the vacuum interrupter 12. The moving contact and stationary contact of the circuit breaker are housed inside the vacuum interrupter 12, which is existing technology. After the disconnecting switch 2 completes closing, the first terminal block 13 and the second terminal block 212 can be energized. The second terminal block 212 is used to connect to an external power source.

[0055] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A cam-driven mechanical interlocking device for a pole-mounted circuit breaker, characterized in that, include: Insulating housing, stationary contact, moving contact, contact seat, insulating rod, control box, operating spindle, crank plate, connecting plate, cam, roller, lever, transmission assembly, locking block; The isolating stationary contact is fixedly connected to the top of the isolating insulating housing. A gate groove is provided at the lower end of the isolating stationary contact. The isolating contact seat is fixedly connected to the interior of the isolating insulating housing. A guide hole is provided in the isolating contact seat. The isolating moving contact is slidably connected to the guide hole. The lower end of the isolating moving contact is fixedly connected to the upper end of the insulating pull rod. The upper end of the isolating moving contact can be inserted into the gate groove. The isolating insulating housing is fixedly connected to the control box. The bottom of the isolating insulating housing communicates with the control box. The isolation operation spindle is rotatably connected to the control box, which is located inside the control box. One end of the crank plate is fixedly connected to the isolation operation spindle, and the other end of the crank plate is hinged to the lower end of the connecting plate. The upper end of the connecting plate is hinged to the lower end of the insulating pull rod. The center of the cam is fixedly connected to the isolation operation spindle, and the cam's wheel surface is provided with an arc-shaped groove. The short section of the lever is rotatably connected to the roller, and the long section of the lever is connected to one end of the locking block via a transmission assembly. A torsion spring is provided between the fulcrum of the lever and the control box. The other end of the locking block is hinged to the control box. When the roller contacts the wheel surface of the cam, the locking block unlocks the circuit breaker operating switch. When the roller contacts the arc-shaped groove, the locking block locks the circuit breaker operating switch.

2. The cam-driven mechanical interlocking device for a pole-mounted circuit breaker according to claim 1, characterized in that, The cam is equipped with a stop.

3. The cam-driven mechanical interlocking device for a pole-mounted circuit breaker according to claim 2, characterized in that, The cam mechanical interlocking device also includes a limiting angle plate, which is fixedly connected to the control box. When the disconnecting switch is closed, the stop block abuts against the limiting angle plate.

4. The cam-driven mechanical interlocking device for a pole-mounted circuit breaker according to claim 1, characterized in that, The transmission assembly includes a bridge rod, a swing arm, and a push-pull rod. The long section of the lever is hinged to one end of the bridge rod, the other end of the bridge rod is hinged to one end of the swing arm, the other end of the swing arm is hinged to the control box, one end of the push-pull rod is hinged to one end of the swing arm, and the other end of the push-pull rod is hinged to one end of the locking block.

5. The cam-driven mechanical interlocking device for a pole-mounted circuit breaker according to claim 1, characterized in that, Also includes: A first conductive plate and a second conductive plate are provided. The upper end of the isolating stationary contact is connected to the first wiring block through the first conductive plate. A second wiring block is provided on the surface of the isolating insulating shell. The isolating contact seat is connected to the second wiring block through the second conductive plate.

6. The cam-driven mechanical interlocking device for a pole-mounted circuit breaker according to claim 5, characterized in that, The isolating contact seat is a split-type isolating contact seat, including a guide tube, a fixing plate, a sealing seat, and a spring contact finger. One end of the fixing plate is disposed between the guide tube and the sealing seat, and the other end of the fixing plate is provided with a mounting hole. The mounting hole is locked to the isolating insulating housing by screws. The guide tube is located below the sealing seat. The sealing seat has an annular groove inside, and the spring contact finger is installed in the annular groove. The isolating moving contact passes through the guide tube and the sealing seat. The other end of the fixing plate is also connected to the second wiring block through the second conductive plate.

7. The cam-driven mechanical interlocking device for a pole-mounted circuit breaker according to claim 1, characterized in that, An isolation operation handle is provided on the outside of the control box. The control box is provided with a rotating hole. The isolation operation handle passes through the rotating hole and is fixedly connected to the isolation operation spindle.

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