Mechanical five-prevention interlocking device and gas-filled cabinet

Abstract

The application discloses a mechanical five-prevention interlocking device and an inflation cabinet, which comprises a three-position interlocking system, an interlocking lifting system, a switch-on and switch-off interlocking system and a back door interlocking system. The three-position interlocking system comprises an interlocking locking plate, and an operation spindle is switched from an isolation state to a grounding state to drive the interlocking locking plate to be switched from an unlocking position to a locking position. The interlocking lifting system comprises a lifting piece, a stop plate, a switch-off locking plate and a clamping plate. The interlocking locking plate is limited to be lifted in the locking position and is not limited in the unlocking position. The switch-on and switch-off interlocking system comprises a switch-off buckle plate and a baffle. The baffle is locked to the stop plate in a switch-off position and is not locked in a switch-on position. The lifted lifting piece drives the switch-off locking plate to move to the position of the switch-off buckle plate. The back door interlocking system comprises a rotating shaft and a back door locking plate. A back door hook is arranged on a cabinet back door. The lifted lifting piece drives the back door locking plate to be not locked to the back door hook. The interlocking shaft plate is provided with an avoiding opening. The avoiding opening corresponds to the clamping plate when the cabinet back door is closed, and the avoiding opening is dislocated from the clamping plate when the cabinet back door is opened.

Description

Technical Field

[0001] This application relates to the field of switchgear technology, and in particular to a mechanical five-proof interlocking device and a gas-filled cabinet. Background Technology

[0002] Currently, mechanical five-proof interlocking is often only applied to air-insulated switchgear. Medium-voltage gas-insulated metal-enclosed switchgear (gas-insulated switchgear), because all high-voltage circuits are completely sealed inside the gas chamber, is generally considered relatively safe by the industry both domestically and internationally, and corresponding mechanical five-proof interlocking is not designed for it. Furthermore, the cable compartment of most gas-insulated switchgear is located at the rear of the cabinet, relatively far from the three-position switchgear and circuit breaker, making mechanical transmission complex and the design of mechanical five-proof interlocking devices technically challenging.

[0003] However, according to relevant regulations, gas-filled switchgear must have this grounding interlock function and must use mechanical interlocking. Some manufacturers in the industry use steel wire for mechanical transmission interlocking, but steel wire has issues with service life and the accuracy of interlocking transmission, resulting in product performance problems.

[0004] Therefore, how to provide a highly reliable and safe mechanical five-proof interlocking device for products where the cable compartment is located behind the gas-insulated switchgear is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this application is to provide a mechanical five-proof interlocking device and an air-filled cabinet, which can be applied to air-filled cabinet products with the cable compartment located at the rear of the cabinet, and has high reliability and safety.

[0006] To achieve the above objectives, this application provides a mechanical five-proof interlocking device, comprising:

[0007] The three-position interlocking system includes an interlocking locking plate that is connected to the three-position operating spindle. The operating spindle is switched from the isolated state to the grounded state to drive the interlocking locking plate to switch from the unlocked position to the locked position.

[0008] An interlocking lifting system includes a liftable lifting component and a stop plate, a tripping locking plate, and a locking plate connected thereto. The interlocking locking plate restricts the lifting of the lifting component in the locked position and releases the restriction in the unlocked position.

[0009] The opening and closing interlocking system includes an opening latch plate and a baffle plate disposed on the opening and closing main shaft. The opening and closing main shaft is used to drive the baffle plate to switch between the opening position and the closing position. In the opening position, the baffle plate locks the stop plate to restrict the lifting member from lifting. In the closing position, the restriction is released. The lifted lifting member drives the opening locking plate to move to the position where the opening latch plate is locked.

[0010] The rear door interlocking system includes a rotating shaft extending through the rear door of the cabinet and a rear door locking plate disposed on the rotating shaft. The rear door of the cabinet is provided with a rear door hook that locks with the rear door locking plate. The locking plate is operatively connected to the rotating shaft. When the lifting member is lifted, it causes the rear door locking plate to disengage from the rear door hook. The system also includes a locking shaft plate operatively connected to the rear door of the cabinet. The locking shaft plate is provided with an clearance opening. When the rear door of the cabinet is closed, the clearance opening corresponds to the locking plate. When the rear door is opened, the clearance opening is misaligned with the locking plate to restrict the descent of the lifting member.

[0011] Optionally, a drive plate is fixed on the operating spindle, and the three-station interlocking system further includes:

[0012] A connecting plate, one end of which abuts against the driving plate, is configured to move linearly under the drive of the driving plate;

[0013] A hinge plate, one end of which is hinged to the other end of the connecting plate, and the other end of which is hinged to one end of the interlocking locking plate, so as to drive the interlocking locking plate to move between the locked position and the unlocked position;

[0014] A first bracket is fixedly mounted on the top of the circuit breaker, and the first bracket has a hinge position that connects to the middle of the hinge plate.

[0015] The second bracket is fixedly mounted on the top of the circuit breaker. The second bracket is provided with a limiting hole for the interlocking locking plate to move linearly. Both ends of the interlocking locking plate are located outside the second bracket, and the other end of the interlocking locking plate is used to lock or unlock the lifting member.

[0016] Optionally, the lifting member includes a lifting rod that can be raised or lowered axially and a lifting handle provided on the lifting rod;

[0017] The lifting rod passes through the circuit breaker along its axial direction, and both ends of the axial direction are located outside the circuit breaker;

[0018] One end of the lifting handle extends toward the interlocking locking plate. When the interlocking locking plate is in the locked position, it is engaged with the lifting handle in the axial direction of the lifting rod to limit the lifting of the lifting member. When the interlocking locking plate is in the unlocked position, it is disengaged from the lifting handle.

[0019] Optionally, the circuit breaker is provided with a guide frame at the top, and a guide hole is provided on the guide frame. The lifting handle passes through the guide hole and moves along the axial direction of the lifting rod under the guidance of the guide hole.

[0020] A temporary storage slot is provided on one side of the top of the guide hole, and the lifting handle can enter the temporary storage slot through the guide hole to keep the lifting component in a raised state.

[0021] Optionally, the tripping interlocking plate is L-shaped, one L-shaped side of the tripping interlocking plate is connected to a guide slider, and the other L-shaped side of the tripping interlocking plate moves between the position of locking the tripping interlocking plate and the position of unlocking the tripping interlocking plate under the guidance of the guide slider.

[0022] A guide rail is provided to cooperate with the guide slider. The guide rail is located at the bottom of the circuit breaker. A transmission plate connected to the guide slider is provided on the lifting rod. The tripping interlocking plate is connected to the lifting rod through the transmission plate.

[0023] Optionally, one end of the positioning plate is fixedly connected to the lifting rod, and the other end is provided with a U-shaped structure, with the two U-shaped walls of the positioning plate distributed along the axial direction of the lifting rod;

[0024] The rotating shaft is provided with a connecting arm at one end away from the rear door locking plate. The connecting arm is hinged to one U-shaped wall of the locking plate, and the other U-shaped wall corresponds to the clearance opening.

[0025] Optionally, one end of the locking shaft plate abuts against the rear door of the cabinet and moves axially as the rear door of the cabinet opens and closes. When the rear door of the cabinet is closed, the U-shaped wall corresponds to the clearance opening; when the rear door of the cabinet is open, the locking shaft plate moves within the U-shaped structure of the locking plate.

[0026] Optionally, it also includes a plurality of support frames disposed on the side panel of the cabinet, wherein the plurality of support frames are respectively used to support the axial movement of the locking shaft plate and to support the rotation of the rotating shaft.

[0027] Optionally, the lifting member and the locking shaft plate are provided with elastic elements, the elastic elements being used to provide elastic force to the clearance on the locking shaft plate to misalign with the locking plate, and / or, the elastic elements being used to provide elastic force to the lifting member in the opposite direction to the lifting direction.

[0028] An air-insulated switchgear includes a cabinet body, a three-position operating device, a circuit breaker, and a mechanical five-proof interlocking device as described above.

[0029] The three-position operating device and the circuit breaker are located on the front side of the cabinet.

[0030] The three-position interlocking system of the mechanical five-proof interlocking device is connected to the three-position operating device, the opening and closing interlocking system of the mechanical five-proof interlocking device is connected to the circuit breaker, the rear door interlocking system of the mechanical five-proof interlocking device is connected to the rear door of the cabinet, and the interlocking lifting system of the mechanical five-proof interlocking device is used to connect the three-position interlocking system, the opening and closing interlocking system, and the rear door interlocking system.

[0031] The beneficial effect of this application is that the lifting component can only be lifted when the three-position switch is in the grounded state (operating spindle switched to the grounded state) and the circuit breaker is in the closed state (baffle in the closed position). After the lifting component is lifted, it will drive the trip interlocking plate to lock the trip interlocking plate, preventing the circuit breaker from tripping. At the same time, it will drive the rear door interlocking plate and the rear door hook to release the lock, allowing the cabinet rear door to be opened. After the cabinet rear door is opened, the clearance on the interlocking shaft plate and the locking plate are misaligned, causing the lifting component to be unable to descend at the lifted position, preventing the circuit breaker from tripping and the three-position switch from being released from the grounded state. This application satisfies the requirement that the cabinet rear door can only be opened when the three-position switch is in the grounded state and the circuit breaker is in the closed state. At the same time, when the cabinet rear door is open, the circuit breaker and the three-position switch can be reverse-locked to prevent them from being released from the system grounded state, preventing accidental entry into the energized compartment and ensuring the reliability and safety of the gas-insulated cabinet product with the cable compartment located at the rear of the cabinet. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the mechanical five-proof interlocking device provided in the embodiments of this application;

[0034] Figure 2 A three-dimensional structural diagram of the interlocking locking plate in the locked position provided in the embodiment of this application;

[0035] Figure 3 A front view of the interlocking locking plate in the locked position according to an embodiment of this application;

[0036] Figure 4 A three-dimensional structural diagram of the interlocking locking plate in the unlocked position provided in the embodiment of this application;

[0037] Figure 5 A front view of the interlocking locking plate in the unlocked position according to an embodiment of this application;

[0038] Figure 6 A three-dimensional structural diagram of the baffle in the open position and the open locking plate unlocking the open latch plate provided in the embodiment of this application;

[0039] Figure 7 A front view of the baffle in the open position and the open locking plate unlocking the open latch plate provided in the embodiment of this application;

[0040] Figure 8 A three-dimensional structural diagram of the baffle in the closed position and the tripping interlocking plate locking the tripping latch plate provided in the embodiment of this application;

[0041] Figure 9 A front view of the baffle in the closed position and the tripping interlocking plate locking the tripping latch plate provided in the embodiment of this application;

[0042] Figure 10 A three-dimensional structural diagram of the rear door locking plate locking the rear door hook provided in an embodiment of this application;

[0043] Figure 11 A three-dimensional structural diagram of the rear door locking plate unlocking rear door hook provided in an embodiment of this application;

[0044] Figure 12 A three-dimensional structural diagram of the cabinet rear door after it is opened, provided in an embodiment of this application;

[0045] Figure 13 This is a schematic diagram of the front structure of the gas-filled cabinet provided in the embodiment of this application;

[0046] Figure 14 This is a three-dimensional structural diagram of the gas-filled cabinet provided in an embodiment of this application.

[0047] In the diagram: 1-Drive plate; 2-Operating spindle; 3-Connecting plate; 4-Hinge plate; 5-First bracket; 6-Second bracket; 7-Interlocking locking plate; 8-Guide frame; 9-Guide hole; 10-Temporary storage slot; 11-Lifting handle; 12-Elastic element; 13-Stop plate; 14-Lifting rod; 15-Baffle; 16-Opening and closing spindle; 17-Locking shaft plate; 18-Support frame; 19-Allowing opening; 20-Connecting arm; 21-Positioning plate; 22-Transmission plate; 23-Guide slide rail; 24-Guide slider; 25-Break-off locking plate; 26-Break-off latch plate; 27-Rotating shaft; 28-Rear door locking plate; 29-Rear door hook; 30-Cabinet rear door; 31-Cabinet; 32-Three-position operating device; 33-Circuit breaker. Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] It should be noted that in this embodiment, the orientation or positional relationship indicated by terms such as "upper," "lower," "front," and "rear" is based on the orientation or positional relationship shown in the accompanying drawings. It is used only for the convenience of describing this application and for simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] Please refer to Figure 1 This embodiment provides a mechanical five-proof interlocking device, which includes a three-position interlocking system, an interlocking lifting system, a gate opening and closing interlocking system, and a rear door interlocking system. The three-position interlocking system is connected to the three-position operating device 32. Specifically, the three-position interlocking system includes an interlocking locking plate 7 that is drivenly connected to the operating spindle 2 of the three-position operating device 32. When the grounding operation is performed in the three-position operation, the operating spindle 2 can be switched from the isolation state to the grounding state, thereby driving the interlocking locking plate 7 to switch from the unlocked position to the locked position.

[0052] The interlocking lifting system can be logically interlocked with the three-position interlocking system, the opening and closing interlocking system, and the rear door interlocking system, thereby realizing the sequential limit relationship of the specific state logic of each functional unit. Specifically, the interlocking lifting system includes a liftable lifting component, which can cooperate with the three-position interlocking system. Please refer to [reference needed]. Figure 2 and Figure 3 When the interlocking locking plate 7 is in the locked position, the interlocking locking plate 7 interferes with the lifting member in the direction of movement, thereby restricting the lifting member from lifting; please refer to Figure 4 and Figure 5 The lifting restriction on the limit member can only be released when the interlocking locking plate 7 moves to the unlock position.

[0053] In other words, when the three-position switch is in the non-grounded state, the interlocking locking plate 7 locks the lifting member in the locked position, preventing the lifting member from being lifted to unlock; conversely, when the three-position switch changes from the isolated state to the grounded state, the interlocking locking plate 7 unlocks the lifting member in the unlocked position, allowing the lifting member to be lifted to unlock.

[0054] The interlocking lifting system also includes a stop plate 13, a tripping interlock plate 25, and a locking plate 21 located on or connected to the lifting member. The stop plate 13 and the tripping interlock plate 25 can cooperate with the opening and closing interlocking system. Specifically, the opening and closing interlocking system includes a tripping latch plate 26 and a baffle plate 15 located on the opening and closing main shaft 16. The tripping latch plate 26 and the opening and closing main shaft 16 are both internal structures of the circuit breaker 33 and can be used to realize the opening and closing operations of the circuit breaker 33. When the circuit breaker 33 switches to the opening state, the opening and closing main shaft 16 can drive the baffle plate 15 to move to the opening position. When the circuit breaker 33 switches to the closing state, the opening and closing main shaft 16 can drive the baffle plate 15 to move to the closing position.

[0055] Please refer to Figure 6 and Figure 7 When the baffle 15 is in the open position, it may interfere with the stop plate 13 in the direction of movement (the direction of movement of the lifting member), thereby locking the stop plate 13 and preventing the lifting member from being lifted to unlock; conversely, please refer to Figure 8 and Figure 9 When the baffle 15 is in the closed position, the baffle 15 unlocks the stop plate 13, thereby allowing the lifting member to be lifted and unlocked. As can be seen from the above embodiments, the lifting member can only be lifted and unlocked when the three-position switch is in the grounded state and the circuit breaker 33 is in the closed state.

[0056] Please refer to Figure 7 Before the lifting element is lifted, the trip interlocking plate 25 and the trip latch plate 26 are in the unlocked state. At this time, the circuit breaker 33 can be tripped through the trip latch plate 26. After the lifting element is lifted, please refer to... Figure 9 The lifting component will drive the tripping locking plate 25 to move, thereby locking the tripping latch plate 26, causing the circuit breaker 33 to be unable to trip and releasing the system grounding state.

[0057] It can be seen that the cooperation between the opening and closing interlocking system and the interlocking lifting system can enable the circuit breaker 33 to unlock and lift the lifting member when it is closed. At the same time, after the lifting member is lifted, it can lock the opening latch plate 26, so that the circuit breaker 33 cannot open.

[0058] The locking plate 21 of the interlocking lifting system can cooperate with the rear door interlocking system. Specifically, the rear door interlocking system includes a rotating shaft 27 extending through the rear door 30 of the cabinet and a rear door locking plate 28 located on the rotating shaft 27. The rear door 30 of the cabinet is provided with a rear door hook 29, and the rear door locking plate 28 can cooperate with the rear door hook 29 to lock the rear door 30 of the cabinet. At the same time, the locking plate 21 is connected to the rotating shaft 27 for transmission, so that when the lifting component is lifted, it can drive the locking plate 21 and the rotating shaft 27 to move, thereby releasing the rear door locking plate 28 from the rear door hook 29 and opening the rear door 30 of the cabinet.

[0059] Please refer to Figure 10Before the lifting mechanism is raised, the rear door locking plate 28 and the rear door hook 29 are locked, at which point the cabinet rear door 30 cannot be opened; please refer to Figure 11 After the lifting component is lifted, the rear door 30 of the cabinet can be opened; at the same time, it is stated above that "the lifting component can only be lifted to unlock when the three-position switch is in the grounded state and the circuit breaker 33 is in the closed state". Therefore, the rear door 30 of the cabinet can only be opened when the three-position switch is in the grounded state and the circuit breaker 33 is in the closed state.

[0060] The rear door interlocking system also includes a locking shaft plate 17 that is connected to the rear door 30 of the cabinet. When the rear door 30 of the cabinet is opened or closed, the locking shaft plate 17 can be driven to move along its axial direction. The locking shaft plate 17 is provided with a clearance opening 19. When the rear door 30 of the cabinet is closed, the clearance opening 19 can correspond to the positioning plate 21 in the direction of movement, so that the positioning plate 21 can pass through the clearance opening 19 during the movement of the lifting component, thereby ensuring the smooth lifting of the lifting component.

[0061] When the rear door 30 of the cabinet is opened, it will cause the locking shaft plate 17 to move. Please refer to... Figure 12 This causes the clearance opening 19 and the positioning plate 21 to become misaligned. As mentioned above, the rear door can only be opened when the lifting component is lifted. Therefore, the lifting component should be in the lifted state at this time. With the positioning plate 21 and the clearance opening 19 misaligned, the lifting component remains in the lifted state and cannot descend.

[0062] When the lifting component fails to descend, the trip interlocking plate 25 will continuously lock the trip interlocking plate 26, preventing the circuit breaker 33 from tripping. It should be noted that both the circuit breaker 33 and the three-position operating device 32 have built-in interlocking functions. If the circuit breaker 33 does not trip, the three-position operating device 32 cannot be operated. Therefore, preventing the circuit breaker 33 from tripping will prevent the three-position switch from being released from the grounding state. Further details are omitted here; please refer to existing technology for specifics.

[0063] In summary, according to the above embodiments, this application can only lift the lifting member when the three-position switch is in the grounded state (operating spindle 2 is switched to the grounded state) and the circuit breaker 33 is in the closed state (baffle 15 is in the closed position). After the lifting member is lifted, it will drive the tripping locking plate 25 to lock the tripping latch plate 26, so that the circuit breaker 33 cannot trip. At the same time, it will drive the rear door locking plate 28 and the rear door hook 29 to be unlocked, so that the cabinet rear door 30 can be opened. After the cabinet rear door 30 is opened, the clearance 19 on the locking shaft plate 17 is misaligned with the locking plate 21, causing the lifting member to be unable to descend at the lifting position, the circuit breaker 33 cannot trip, and the three-position switch cannot be released from the grounded state. This application ensures that the rear door 30 of the cabinet can only be opened when the three-position switch is in the grounded state and the circuit breaker 33 is in the closed state. At the same time, when the rear door 30 is open, the circuit breaker 33 and the three-position switch can be reverse-locked to prevent them from being released from the system grounded state, thus preventing accidental entry into the energized compartment and ensuring the reliability and safety of the gas-insulated cabinet product with the cable compartment located at the rear of the cabinet.

[0064] Please refer to Figure 1 The operating spindle 2 is fixed with a drive plate 1, which can drive the drive plate 1 to rotate when the operating spindle 2 switches from the isolated state to the grounded state; the three-position interlocking system also includes a connecting plate 3, a hinge plate 4, a first bracket 5 and a second bracket 6.

[0065] One end of the connecting plate 3 abuts against the drive plate 1. The rotation of the drive plate 1 can push the connecting plate 3 to move linearly. One end of the hinge plate 4 is hinged to the other end of the connecting plate 3, and the other end of the hinge plate 4 is hinged to one end of the interlocking locking plate 7. Thus, the movement of the connecting plate 3 pushes the hinge plate 4 to rotate, and the rotation of the hinge plate 4 can drive the interlocking locking plate 7 to move between the locked and unlocked positions. It should be noted that the mutual conversion between rotation and linear motion can be achieved through a slotted hole. For example, a slotted hole is opened on the connecting plate 3, and a hinge shaft is set on the hinge plate 4. The hinge shaft can extend into the slotted hole and be movably set relative to the slotted hole. Thus, the movement of the hinge shaft relative to the slotted hole satisfies the angle and length changes generated by the hinge shaft during rotation, ensuring the mutual conversion between rotation and linear motion. Similarly, the arrangement of the hinge shaft and the interlocking locking plate 7 can also refer to the above scheme, so that the interlocking locking plate 7 can move linearly between the unlocked and locked positions.

[0066] The first bracket 5 and the second bracket 6 are fixedly installed on the top outer wall of the circuit breaker 33. The first bracket 5 has a hinge position connected to the middle of the hinge plate 4 to ensure that the hinge plate 4 can be stably installed. The second bracket 6 is provided with a limiting hole for the interlocking locking plate 7 to make linear movement. Both ends of the interlocking locking plate 7 are located outside the second bracket 6. One end of the interlocking locking plate 7 is connected to the hinge plate 4, and the other end is used to lock or unlock the lifting part.

[0067] The lifting component includes a lifting rod 14 that can be raised or lowered axially and a lifting handle 11 provided on the lifting rod 14. Please refer to [reference needed]. Figure 1 The lifting rod 14 passes through the circuit breaker 33 along its axial direction, and both ends of the axial direction are located outside the circuit breaker 33. The lifting rod 14 can move relative to the circuit breaker 33.

[0068] One end of the lifting handle 11 extends toward the interlocking locking plate 7, and the other end faces the operator's side, facilitating manual lifting of the lifting handle 11. The interlocking locking plate 7, located in the locked position, is engaged with the lifting handle 11 in the axial (movement direction) direction of the lifting rod 14. Please refer to... Figure 3 This restricts the lifting of the lifting component; and when the interlocking locking plate 7 is in the unlocked position, please refer to... Figure 5 The interlocking locking plate 7 is disengaged from the lifting handle 11.

[0069] A guide frame 8 is also provided on the top outer wall of the circuit breaker 33. A guide hole 9 is provided on the guide frame 8. The lifting handle 11 can pass through the guide hole 9 and move axially along the lifting rod 14 under the guidance of the guide hole 9. A temporary storage groove 10 is provided on one side of the top of the guide hole 9 and communicates with it. After the lifting rod 14 is lifted, the lifting handle 11 can move to the top of the guide hole 9 and enter the temporary storage groove 10, so that the lifting rod 14 is kept in the lifted state.

[0070] It can be seen that the lifting rod 14 can be kept in the raised state by opening the cabinet rear door 30, and can also be kept in the raised state by the cooperation of the lifting handle 11 and the temporary storage slot 10.

[0071] It should be noted that, since the lifting handle 11 will move to one side when it enters the temporary storage slot 10, strip holes can be opened at the top and bottom of the circuit breaker 33 to meet the translational movement of the lifting rod 14.

[0072] Please refer to Figure 1 The tripping interlocking plate 25 is L-shaped. One L-shaped side of the tripping interlocking plate 25 is connected to a guide slider 24. The other L-shaped side of the tripping interlocking plate 25 moves between the locked and unlocked positions of the tripping plate 26 under the guidance of the guide slider 24. A guide rail 23 cooperates with the guide slider 24 and is set on the inner wall of the bottom of the circuit breaker 33. The lifting rod 14 is equipped with a transmission plate 22 connected to the guide slider 24. When the lifting rod 14 is lifted, the transmission plate 22 can simultaneously drive the guide slider 24 and the tripping interlocking plate 25 to be lifted, thereby locking the other L-shaped side of the tripping interlocking plate 25 to the tripping plate 26.

[0073] Considering that the lifting rod 14 has a certain translational function, the transmission plate 22 can be set as a transmission plate 22 with a certain degree of extensibility. For example, two transmission plates 22 that can slide relative to each other can be used. The sliding direction of the two transmission plates 22 is consistent with the translational direction of the lifting rod 14, thereby ensuring the stable connection between the transmission plate 22 and the guide slider 24.

[0074] Please refer to Figure 1 One end of the positioning plate 21 is fixedly connected to the lifting rod 14, and the other end is provided with a U-shaped structure. The two U-shaped walls of the positioning plate 21 are distributed along the axial direction of the lifting rod 14. The rotating shaft 27 is provided with a connecting arm 20 at the end away from the rear door locking plate 28. The connecting arm 20 is hinged to one U-shaped wall of the positioning plate 21, so that the linear movement of the positioning plate 21 (movement along the axial direction of the lifting rod 14) is converted into the rotation of the rotating shaft 27. Similarly, the conversion between linear movement and rotation can also be achieved by using a strip hole. This will not be elaborated here, but can be referred to the above technical solution.

[0075] Furthermore, even if the lifting rod 14 moves horizontally, the hinge between the positioning plate 21 and the connecting arm 20, as well as the setting of the strip hole, can ensure a stable connection between the positioning plate 21 and the connecting arm 20.

[0076] The other U-shaped wall of the positioning plate 21 corresponds to the clearance opening 19. When the lifting rod 14 is lifted, the U-shaped wall can pass over the clearance opening 19, thereby ensuring the stable lifting of the lifting rod 14.

[0077] The transmission connection between the cabinet rear door 30 and the locking shaft plate 17 includes, but is not limited to, one end of the locking shaft plate 17 abutting against the cabinet rear door 30. The transmission connection is manifested in the following ways: when the cabinet rear door 30 is closed, the locking shaft plate 17 is pressed by the cabinet rear door 30, and the clearance opening 19 on the locking shaft plate 17 corresponds to the positioning plate 21; when the cabinet rear door 30 is opened, the cabinet rear door 30 releases the pressure on the locking shaft plate 17, and the locking shaft plate 17 can move towards the cabinet rear door 30, thereby causing the locking shaft plate 17 to move axially and causing the clearance opening 19 to be misaligned with the positioning plate 21.

[0078] The locking shaft plate 17 has a shaft-like structure on one side and a plate-like structure on the other side, with the clearance opening 19 located in the plate-like structure. As mentioned above, the cabinet rear door 30 can only be opened when the lifting rod 14 is lifted. Therefore, when the rear door can be opened, the other U-shaped wall of the positioning plate 21 has already crossed the clearance opening 19, and its U-shaped structure corresponds to the locking shaft plate 17. At this time, if the cabinet rear door 30 is opened, the locking shaft plate 17 will move within the U-shaped structure of the positioning plate 21.

[0079] As can be seen, after the cabinet rear door 30 is opened, the locking shaft plate 17 moves, causing the clearance opening 19 to be misaligned with the positioning plate 21, thereby forming a mechanical limit on the positioning plate 21. The locking shaft plate 17 is engaged in the U-shaped structure of the positioning plate 21, causing the positioning plate 21 to be unable to descend, and the pull rod fixedly connected to the positioning plate 21 also cannot descend, and can only remain in the raised state.

[0080] The lifting rod 14 cannot be lowered, thus preventing the trip interlock plate 25 from moving down. Consequently, the trip interlock plate 26 cannot be unlocked, the circuit breaker 33 cannot trip, the three-position operation cannot be performed, and the grounding status cannot be released. This achieves the functional requirement that the grounding system cannot be released without closing the cabinet back door 30.

[0081] The mechanical five-proof interlocking device is installed inside the cabinet 31. The internal side panels, back panel, and front panel of the cabinet 31 can be used to limit the movement of each moving component. For example, multiple support frames 18 can be installed on the side panels. These support frames 18 are used to support the axial movement of the locking shaft plate 17 and the rotation of the rotating shaft 27. The support frames 18 cooperate with the shaft-like structure of the locking shaft plate 17, allowing the locking shaft plate 17 to move stably along the axial direction. Furthermore, the support frames 18 can also cooperate with the plate-like structure of the locking shaft plate 17, ensuring that the locking shaft plate 17 only moves axially without rotation, thus ensuring the accuracy of the clearance opening 19.

[0082] Additionally, elastic elements 12 are provided on the lifting member and the locking shaft plate 17. These elastic elements 12, such as springs, are sleeved on the outer periphery of the lifting rod 14 and the outer periphery of the shaft-like structure of the locking shaft plate 17. The elastic elements 12 provide a resilient force to the locking shaft plate 17 to move towards the rear door 30 of the cabinet, or in other words, provide a resilient force to the clearance opening 19 to offset from the locking plate 21, so that when the rear door 30 of the cabinet opens, the clearance opening 19 can automatically offset from the locking plate 21 under the action of the elastic force. The elastic elements 12 also provide a resilient force to the lifting member in the opposite direction of lifting, ensuring that the lifting rod 14 has an elastic force that automatically descends after the external force disappears.

[0083] Pins can be provided on the lifting rod 14 and the locking shaft plate 17. Taking the spring on the lifting rod 14 as an example, the two ends of the spring are connected to the pin and the top or bottom of the circuit breaker 33 respectively, thereby applying an elastic force to the lifting rod 14. Similarly, the spring on the locking shaft plate 17 is located on its shaft structure, and the two ends of the spring can be connected to the pin and the support frame 18 respectively, thereby applying an elastic force to the locking shaft plate 17.

[0084] This application also provides an inflatable cabinet, please refer to... Figure 13 and Figure 14The gas-filled switchgear includes a cabinet 31, a three-position operating device 32, a circuit breaker 33, and a mechanical five-proof interlocking device as described above. The three-position operating device 32 and the circuit breaker 33 are located on the front side of the cabinet 31. The three-position interlocking system of the mechanical five-proof interlocking device is connected to the three-position operating device 32. The opening and closing interlocking system of the mechanical five-proof interlocking device is connected to the circuit breaker 33. The rear door interlocking system of the mechanical five-proof interlocking device is connected to the rear door 30 of the cabinet 31.

[0085] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0086] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A mechanical five-proof interlocking device, characterized in that, include: The three-position interlocking system includes an interlocking locking plate (7) that is connected to the three-position operating spindle (2) via a transmission. The operating spindle (2) is switched from the isolation state to the ground state to drive the interlocking locking plate (7) to switch from the unlocked position to the locked position. The interlocking lifting system includes a liftable lifting member and a stop plate (13), a tripping locking plate (25), and a locking plate (21) connected thereto. The interlocking locking plate (7) restricts the lifting member from lifting in the locked position and releases the restriction in the unlocked position. The opening and closing interlocking system includes an opening latch plate (26) and a baffle (15) disposed on the opening and closing main shaft (16). The opening and closing main shaft (16) is used to drive the baffle (15) to switch between the opening position and the closing position. The baffle (15) locks the stop plate (13) in the opening position to restrict the lifting member from lifting. The restriction is released in the closing position. The lifted lifting member drives the opening locking plate (25) to move to the position where the opening latch plate (26) is locked. The rear door interlocking system includes a rotating shaft (27) extending through the rear door (30) of the cabinet and a rear door locking plate (28) disposed on the rotating shaft (27). The rear door (30) of the cabinet is provided with a rear door hook (29) that locks with the rear door locking plate (28). The locking plate (21) is connected to the rotating shaft (27) in a transmission manner. The lifted lifting member drives the rear door locking plate (28) and the rear door hook (29) to release the lock. The system also includes a locking shaft plate (17) that is connected to the rear door (30) of the cabinet in a transmission manner. The locking shaft plate (17) is provided with a clearance opening (19). When the rear door (30) of the cabinet is closed, the clearance opening (19) corresponds to the locking plate (21). When the rear door (30) is opened, the clearance opening (19) is misaligned with the locking plate (21) to restrict the lowering of the lifting member. The operating spindle (2) is fixed with a drive plate (1), and the three-station interlocking system further includes: A connecting plate (3) abuts against the driving plate (1) at one end, and the connecting plate (3) is configured to move linearly under the drive of the driving plate (1); The hinge plate (4) is hinged at one end to the other end of the connecting plate (3) and at the other end to one end of the interlocking locking plate (7) so as to drive the interlocking locking plate (7) to move between the locked position and the unlocked position; The first bracket (5) is fixedly installed on the top of the circuit breaker (33), and the first bracket (5) has a hinge position connected to the middle of the hinge plate (4); The second bracket (6) is fixedly installed on the top of the circuit breaker (33). The second bracket (6) is provided with a limiting hole for the interlocking locking plate (7) to make linear movement. Both ends of the interlocking locking plate (7) are located outside the second bracket (6), and the other end of the interlocking locking plate (7) is used to lock or unlock the lifting member.

2. The mechanical five-proof interlocking device according to claim 1, characterized in that, The lifting component includes a lifting rod (14) that can be raised or lowered along the axial direction and a lifting handle (11) provided on the lifting rod (14). The lifting rod (14) passes through the circuit breaker (33) along its axial direction, and both ends of the axial direction are located outside the circuit breaker (33); One end of the lifting handle (11) extends toward the interlocking locking plate (7). The interlocking locking plate (7) in the locked position is engaged with the lifting handle (11) in the axial direction of the lifting rod (14) to limit the lifting of the lifting member. The interlocking locking plate (7) is released from engagement with the lifting handle (11) in the unlocked position.

3. The mechanical five-proof interlocking device according to claim 2, characterized in that, The circuit breaker (33) is provided with a guide frame (8) at the top, and a guide hole (9) is provided on the guide frame (8). The lifting handle (11) passes through the guide hole (9) and moves axially along the lifting rod (14) under the guidance of the guide hole (9). A temporary storage groove (10) is provided on one side of the top of the guide hole (9) and communicates with it. The lifting handle (11) can enter the temporary storage groove (10) through the guide hole (9) so that the lifting member is kept in the lifted state.

4. The mechanical five-proof interlocking device according to claim 2, characterized in that, The tripping locking plate (25) is L-shaped. One L-shaped side of the tripping locking plate (25) is connected to a guide slider (24). The other L-shaped side of the tripping locking plate (25) moves between the position of locking the tripping latch plate (26) and the position of unlocking the tripping latch plate (26) under the guidance of the guide slider (24). A guide rail (23) is provided in cooperation with the guide slider (24). The guide rail (23) is located at the bottom of the circuit breaker (33). A transmission plate (22) connected to the guide slider (24) is provided on the lifting rod (14). The tripping lock plate (25) is connected to the lifting rod (14) through the transmission plate (22).

5. The mechanical five-proof interlocking device according to claim 2, characterized in that, One end of the positioning plate (21) is fixedly connected to the lifting rod (14), and the other end is provided with a U-shaped structure. The two U-shaped walls of the positioning plate (21) are distributed along the axial direction of the lifting rod (14). The rotating shaft (27) is provided with a connecting arm (20) at one end away from the rear door locking plate (28). The connecting arm (20) is hinged to one U-shaped wall of the locking plate (21), and the other U-shaped wall corresponds to the clearance opening (19).

6. The mechanical five-proof interlocking device according to claim 5, characterized in that, One end of the locking shaft plate (17) abuts against the rear door (30) of the cabinet and moves axially as the rear door (30) of the cabinet opens and closes. When the rear door (30) of the cabinet is closed, the U-shaped wall corresponds to the clearance opening (19). When the rear door (30) of the cabinet is open, the locking shaft plate (17) moves within the U-shaped structure of the card plate (21).

7. The mechanical five-proof interlocking device according to claim 1, characterized in that, It also includes multiple support frames (18) provided on the side panel of the cabinet (31), and the multiple support frames (18) are respectively used to support the axial movement of the locking shaft plate (17) and to support the rotation of the rotating shaft (27).

8. The mechanical five-proof interlocking device according to any one of claims 1-7, characterized in that, The lifting member and the locking shaft plate (17) are provided with elastic members (12), the elastic members (12) are used to provide the clearance opening (19) on the locking shaft plate (17) with an elastic force that is misaligned with the locking plate (21), and / or, the elastic members (12) are used to provide the lifting member with an elastic force opposite to the lifting direction.

9. An inflatable cabinet, characterized in that, Includes a cabinet (31), a three-position operating device (32), a circuit breaker (33), and a mechanical five-proof interlocking device as described in any one of claims 1-8; The three-position operating device (32) and the circuit breaker (33) are located on the front side of the cabinet (31); The three-position interlocking system of the mechanical five-proof interlocking device is connected to the three-position operating device (32), the opening and closing interlocking system of the mechanical five-proof interlocking device is connected to the circuit breaker (33), and the rear door interlocking system of the mechanical five-proof interlocking device is connected to the rear door (30) of the cabinet (31).

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