Mechanical interlocking device and inflatable cabinet

Abstract

The invention belongs to the technical field of power distribution switches, and discloses a mechanical interlocking device and a gas-insulated switchgear, the mechanical interlocking device comprises a three-position switch, a circuit breaker and two mechanical locks, the two mechanical locks together lock a rear door of the gas-insulated switchgear, a disconnecting link of the three-position switch is connected with one of the mechanical locks through a first connecting rope, and the other mechanical lock is connected with a second connecting rope. When the disconnecting link of the three-position switch is adjusted to a grounding position, the mechanical lock connected with the three-position switch can be converted from a locking state to an unlocking state; and the switch of the circuit breaker is connected with the other mechanical lock through a second connecting rope, and when the circuit breaker is in a closed state, the mechanical lock connected with the circuit breaker can be converted into an unlocked state from a locked state. The mechanical interlocking device can solve the problems that an existing gas-insulated switchgear is not provided with an interlocking device for a three-position switch grounding position and a rear door, when field maintenance and construction personnel open the rear door to maintain the gas-insulated switchgear, a cable chamber is possibly electrified, and personal safety is likely to be endangered.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution switches, and particularly to a mechanical interlocking device and a gas-insulated switchgear cabinet. Background Art

[0002] The gas-insulated switchgear cabinet belongs to a type of distribution switchgear cabinet. A gas-insulated switchgear cabinet refers to a gas-insulated metal-enclosed switchgear, which adopts a modular design, has a compact overall structure, occupies a small space, and has a high protection level at the same time. Therefore, the gas-insulated switchgear cabinet can be used in power generation stations, substations, industrial and mining enterprises, subways and other fields. According to the "Safety Management Regulations for Preventing Electrical Maloperations of State Grid Corporation of China", while meeting the national standard requirements, the distribution switchgear cabinet should also have the "five-prevention" functions of "preventing misoperation of circuit breakers, preventing disconnection and connection of isolating switches under load, preventing disconnection and connection of earthing switches under live conditions, preventing power transmission with earthing switches closed, and preventing unauthorized entry into live compartments". For the requirement of "preventing unauthorized entry into live isolation", it is required that the high-voltage compartment door can be opened only after the high-voltage compartment is grounded, and at the same time, it is also required that the earthing switch can be operated to trip only when the high-voltage compartment door is closed.

[0003] The existing gas-insulated switchgear cabinet does not have an interlocking device between the grounding position of the three-position switch and the rear door. When on-site maintenance and construction personnel open the rear door to maintain the gas-insulated switchgear cabinet, it may cause the cable compartment to be energized, which is likely to endanger personal safety.

[0004] Therefore, there is an urgent need for a mechanical interlocking device and a gas-insulated switchgear cabinet to solve the above technical problems. Summary of the Invention

[0005] The first object of the present invention is to provide a mechanical interlocking device and a gas-insulated switchgear cabinet, which can solve the problem that the existing gas-insulated switchgear cabinet does not have an interlocking device between the grounding position of the three-position switch and the rear door. When on-site maintenance and construction personnel open the rear door to maintain the gas-insulated switchgear cabinet, it may cause the cable compartment to be energized, which is likely to endanger personal safety.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A mechanical interlocking device includes:

[0008] A three-position switch, a circuit breaker and two mechanical locks. The two mechanical locks lock the rear door and the cabinet frame of the gas-insulated switchgear cabinet together. The knife switch of the three-position switch is connected to one of the mechanical locks through a first connecting rope. When the knife switch of the three-position switch is adjusted to the grounding position, the mechanical lock connected to the three-position switch can be changed from the locked state to the unlocked state; the switch of the circuit breaker is connected to the other mechanical lock through a second connecting rope. When the circuit breaker is in the closed state, the mechanical lock connected to the circuit breaker can be changed from the locked state to the unlocked state.

[0009] As an optimal technical solution for the mechanical interlocking device, the mechanical interlocking device also includes a first switch and a second switch, the first switch is used to control the locking of the three-position switch, the first switch is connected to the mechanical lock connected to the three-position switch through a third connecting rope, and when the rear door is opened, the third connecting rope can be pulled to turn on the first switch; the second switch is used to control the locking of the circuit breaker, the second switch is connected to the mechanical lock connected to the circuit breaker through a fourth connecting rope, and when the rear door is opened, the fourth connecting rope can be pulled to turn on the second switch.

[0010] As a preferred technical solution of the mechanical interlocking device, the mechanical lock includes a connecting column, a fixed frame, a movable sheet, a mounting sheet, a rotating sheet, a first pin, a hook, a first elastic member and a second elastic member. The connecting column is arranged on the rear door, the fixed frame is placed on the cabinet frame and has an opening facing the connecting column, the first pin is movably penetrated through the side wall of the fixed frame, one end of the first pin close to the connecting column is connected to the hook, and the other end is connected to the mounting sheet, the movable sheet is movably connected to the cabinet frame, the mounting sheet is connected to the movable sheet, when the movable sheet moves, the mounting sheet has a movable space, the rotating sheet connects the movable sheet and the first connecting rope, when the mechanical lock is in a locked state, the first pin abuts against the connecting column, the hook overlaps the bottom surface of the fixed frame and is placed in the groove of the connecting column; the first elastic member is connected to the rotating sheet, and has a tendency to make the end of the rotating sheet connected to the movable sheet away from the connecting column; the second elastic member has a tendency to make the mounting sheet close to the connecting column; the third connecting rope is connected to the mounting sheet.

[0011] As a preferred technical solution of the mechanical interlocking device, the mounting plate is provided with a waist-shaped hole, the movable plate is provided with a mounting hole, and the connecting pin passes through the waist-shaped hole and the mounting hole.

[0012] As a preferred technical solution for the mechanical interlocking device, the mechanical lock also includes a second pin shaft, which is movably arranged in the side wall of the fixed frame and connected to the mounting plate, and the second elastic member is placed between the head of the second pin shaft and the side wall of the fixed frame. When the mechanical lock is in a locked state, the second elastic member is in a compressed state.

[0013] As an optimal technical solution for the mechanical interlocking device, a partition is provided on the cabinet frame, and the partition is placed on the side of the rotating plate facing away from the fixed frame. The first elastic member connects the end of the rotating plate facing away from the movable plate and the partition. When the mechanical lock is in a locked state, the first elastic member is in a compressed state.

[0014] As a preferred technical solution of the mechanical interlock device, a baffle is further provided on the cabinet frame. The baffle is connected to the cabinet frame. The baffle is provided with an occlusion part, and the occlusion part is located on the side of the rotating piece away from the connecting column.

[0015] As a preferred technical solution of the mechanical interlock device, the connecting columns of the two mechanical locks are both connected to the cabinet frame through locking pieces. The locking pieces include nuts and screws. The screws are used to lock the connecting columns and the cabinet frame, and the nuts are placed outside the gas-insulated switchgear.

[0016] As a preferred technical solution of the mechanical interlock device, the first connecting rope, the second connecting rope, the third connecting rope and the fourth connecting rope are all steel wires.

[0017] The second object of the present invention is to provide a gas-insulated switchgear. To achieve this object, the present invention adopts the following technical solutions:

[0018] A gas-insulated switchgear includes the mechanical interlock device described in any one of the above.

[0019] The beneficial effects of the present invention are as follows:

[0020] The mechanical interlock device provided by the present invention includes a first mechanical lock, a second mechanical lock, a three-position switch and a circuit breaker. The first mechanical lock and the second mechanical lock together lock the frame of the rear door of the gas-insulated switchgear. The blade of the three-position switch is connected to the first mechanical lock through a first connecting rope. When the blade of the three-position switch is adjusted to the grounding position, the first connecting rope pulls the first mechanical lock, and at this time, the first mechanical lock changes from the locked state to the unlocked state. The switch of the circuit breaker is connected to the second mechanical lock through a second connecting rope. When the circuit breaker is in the closed state, the second connecting rope pulls the second mechanical lock, and at this time, the second mechanical lock changes from the locked state to the unlocked state. Since the first mechanical lock and the second mechanical lock jointly lock the cabinet frame of the rear door, only when the blade of the three-position switch is in the grounding position and the circuit breaker is in the closed state can the rear door of the gas-insulated switchgear be opened. At this time, the gas-insulated switchgear is completely in the grounded state, avoiding the situation that the cable chamber of the gas-insulated switchgear is electrified when the staff opens the rear door for maintenance of the gas-insulated switchgear, ensuring the personal safety of the staff.

[0021] The gas-insulated switchgear provided by the present invention can only be opened when the blade of the three-position switch is in the grounding position and the circuit breaker is in the closed state, that is, when the gas-insulated switchgear is completely de-energized, making the gas-insulated switchgear meet the requirements of the "five-prevention" standard and effectively ensuring the safety of the staff during the maintenance of the gas-insulated switchgear. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of the mechanical interlock device in the gas-insulated switchgear provided by the present invention;

[0023] Figure 2 This is provided by the present invention Figure 1 Schematic enlarged view of part A in

[0024] In the figure:

[0025] 100, back door; 200, cabinet frame; 201, partition; 202, baffle

[0026] 1, three-position switch; 2, circuit breaker

[0027] 3, mechanical lock; 30, connecting column; 31, fixed frame; 32, movable piece; 33, mounting piece; 34, rotating piece; 35, first pin shaft; 36, hook; 37, first elastic member; 38, second elastic member; 39, second pin shaft

[0028] 4, first connecting rope; 5, second connecting rope; 6, third connecting rope; 7, fourth connecting rope; 8, locking member Specific embodiments

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only the parts related to the present invention are shown in the drawings, rather than all the structures

[0030] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations

[0031] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below", and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature is at a lower horizontal height than the second feature

[0032] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0033] Embodiment 1

[0034] As Figure 1 and Figure 2 As shown in [relevant figures], this embodiment provides a mechanical interlocking device. The mechanical interlocking device includes two mechanical locks 3, a three-position switch 1, and a circuit breaker 2. Among them, the two mechanical locks 3 together lock the rear door 100 and the frame of the gas-insulated switchgear. The blade of the three-position switch 1 is connected to one of the mechanical locks 3 through a first connecting rope 4. When the blade of the three-position switch 1 is adjusted to the grounded position, the first connecting rope 4 pulls this mechanical lock 3. At this time, the mechanical lock 3 connected to the three-position switch 1 can be changed from the locked state to the unlocked state. The switch of the circuit breaker 2 is connected to the other mechanical lock 3 through a second connecting rope 5. When the circuit breaker 2 is in the closed state, the second connecting rope 5 pulls the other mechanical lock 3. At this time, the mechanical lock 3 connected to the circuit breaker 2 can be changed from the locked state to the unlocked state. Since the two mechanical locks 3 jointly lock the cabinet frame 200 of the rear door 100, only when the blade of the three-position switch 1 is in the grounded position and the circuit breaker 2 is in the closed state, and both mechanical locks 3 are in the unlocked state, can the rear door 100 of the gas-insulated switchgear be opened. At this time, the gas-insulated switchgear is completely in the grounded state, avoiding the situation that the cable chamber of the gas-insulated switchgear is charged when the staff opens the rear door 100 for maintenance of the gas-insulated switchgear, thus ensuring the personal safety of the staff.

[0035] In this embodiment, the mechanical interlock device further includes a first switch and a second switch. The first switch is used to control the locking of the three-position switch 1. When the three-position switch 1 is in the locked state, it cannot be operated. Among them, the first switch is connected to the mechanical lock 3 connected to the three-position switch 1 through the third connecting rope 6. When the rear door 100 is opened, the third connecting rope 6 can be pulled to turn on the first switch, so that the three-position switch 1 is in the locked state after the disconnecting switch is in the grounded position, avoiding misoperation by the staff to change its current state. The second switch is used to control the locking of the circuit breaker 2. When the circuit breaker 2 is in the locked state, it cannot be operated. Among them, the second switch is connected to the mechanical lock 3 connected to the circuit breaker 2 through the fourth connecting rope 7. When the rear door 100 is opened, the fourth connecting rope 7 can be pulled to turn on the second switch, so that the circuit breaker 2 is in the locked state after being closed, avoiding misoperation by the staff to change its current state. In this way, when the rear door 100 of the gas-insulated switchgear is opened, both the three-position switch 1 and the circuit breaker 2 are in the locked state, ensuring that when there are staff members performing maintenance on the gas-insulated switchgear, the disconnecting switch of the three-position switch 1 is always in the grounded position and the circuit breaker 2 is always in the closed position, that is, ensuring that the gas-insulated switchgear is always in the grounded state during maintenance, further improving the safety of the staff during the maintenance process. Among them, the mutual interlock between electrical components and switches belongs to the conventional technical means in the field of electricity and is not the key protection content of the present invention.

[0036] Exemplarily, the mechanical lock 3 includes a connecting column 30, a fixed frame 31, a movable piece 32, a mounting piece 33, a rotating piece 34, a first pin shaft 35, a hook 36, a first elastic member 37 and a second elastic member 38. Among them, the connecting column 30 is arranged on the rear door 100, the fixed frame 31 is arranged on the cabinet frame 200 and the opening faces the connecting column 30. The first pin shaft 35 is movably inserted through the side wall of the fixed frame 31. One end of the first pin shaft 35 close to the connecting column 30 is connected to the hook 36, and the other end is connected to the mounting piece 33. The movable piece 32 is movably connected to the cabinet frame 200. The mounting piece 33 is connected to the movable piece 32. When the movable piece 32 moves, the mounting piece 33 can have a moving space. The rotating piece 34 is rotatably connected to the cabinet frame 200. One end of the rotating piece 34 is connected to the movable piece 32. When the mechanical lock 3 is connected to the three-position switch 1 in a matching manner, the other end of the rotating piece 34 is connected to the first connecting rope 4. A groove is provided at one end of the connecting column 30 close to the hook 36. When the mechanical lock 3 is in the locked state, the first pin shaft 35 abuts against the connecting column 30, the hook 36 is placed in the groove, and the bottom of the hook 36 is lapped on the bottom surface of the fixed frame 31. The second elastic member 38 has a tendency to make the mounting piece 33 approach the connecting column 30.

[0037] When the staff adjusts the knife switch of the three-position switch 1 to the grounded position, the first connecting rope 4 will be pulled in the direction away from the connecting column 30. The rotating piece 34 in the mechanical lock 3 connected to the three-position switch 1 will rotate clockwise. The rotating piece 34 will push the movable piece 32 to move closer to the connecting column 30. Since the first pin shaft 35 abuts against the connecting column 30, the position of the mounting piece 33 will not change. However, since the connection point position between the mounting piece 33 and the movable piece 32 changes, the mounting piece 33 has a movable space. At this time, the staff opens the rear door 100, and the connecting column 30 will move away from the first pin shaft 35. Under the action of the second elastic member 38, the mounting piece 33 moves closer to the connecting column 30, and the first pin shaft 35 is connected to the mounting piece 33. That is, when the connecting column 30 moves away from the first pin shaft 35, the first pin shaft 35 will move closer to the connecting column 30 direction, and the first pin shaft 35 drives the hook 36 to move. At this time, the hook 36 will fall off from the bottom surface of the fixed frame 31, and the hook 36 will rotate downward under the action of gravity, away from the groove, and will not affect the opening of the rear door 100. The third connecting rope 6 is connected to the mounting piece 33. Therefore, during the opening process of the rear door 100, the mounting piece 33 moves closer to the connecting column 30 under the action of the second elastic member 38. At this time, the third connecting rope 6 will be pulled, locking the three-position switch 1. The first elastic member 37 is connected to the rotating piece 34 and has a tendency to move the end of the rotating piece 34 connected to the movable piece 32 away from the connecting column 30. Therefore, when the rotating piece 34 is not pulled by the first connecting rope 4, under the action of the first elastic member 37, the movable piece 32 and the mounting piece 33 are always in a fixed position, that is, the mounting piece 33 has no movable space, and the staff cannot pull the rear door 100 effortlessly.

[0038] On the other hand, when the mechanical lock 3 is connected to the circuit breaker 2 in a matching manner, at this time, the other end of the rotating piece 34 in the mechanical lock 3 is connected to the second connecting rope 5.

[0039] When the staff adjusts the circuit breaker 2 to the closed position, the second connecting rope 5 will be pulled in the direction away from the connecting column 30. The rotating piece 34 in the mechanical lock 3 connected to the circuit breaker 2 will rotate clockwise. The rotating piece 34 will push the movable piece 32 to move closer to the connecting column 30, making the mounting piece 33 have a movable space. At this time, the staff opens the rear door 100, and the connecting column 30 will move away from the first pin shaft 35. Under the action of the second elastic member 38, the mounting piece 33 moves closer to the connecting column 30, and the first pin shaft 35 drives the hook 36 to move closer to the connecting column 30 direction. The hook 36 will fall off from the bottom surface of the fixed frame 31 and rotate downward under the action of gravity, away from the groove. The fourth connecting rope 7 is connected to the mounting piece 33. During the opening process of the rear door 100, the mounting piece 33 moves closer to the connecting column 30 under the action of the second elastic member 38. At this time, the fourth connecting rope 7 will be pulled, locking the circuit breaker 2.

[0040] For example, the mounting plate 33 is provided with a waist-shaped hole, the movable plate 32 is provided with a mounting hole, and the connecting pin passes through the waist-shaped hole and the mounting hole, so as to connect the mounting plate 33 with the movable plate 32. When the rotating plate 34 is pulled clockwise, the movable plate 32 and the connecting pin move along the waist-shaped hole, and the connection point between the mounting plate 33 and the movable plate 32 changes, so that the mounting plate 33 has a movable space. When the connecting column 30 is away from the first pin shaft 35, the mounting plate 33 moves toward the connecting column 30 under the action of the second elastic member 38, and the hook 36 falls off and disengages from the groove of the connecting column 30, so that the rear door 100 can be opened smoothly.

[0041] Furthermore, the mechanical lock 3 also includes a second pin shaft 39, which is movably arranged on the side wall of the fixed frame 31 and connected to the mounting plate. The second pin shaft 39 is located on one side of the first pin shaft 35, and the second elastic member 38 is placed between the head of the second pin shaft 39 and the side wall of the fixed frame 31. When the mechanical lock 3 is in a locked state, the second elastic member 38 is in a compressed state. In this way, when the rotating piece 34 is pulled to rotate clockwise, the movable piece 32 moves toward the connecting column 30, and the mounting piece 33 has a movable space. The staff opens the rear door 100, the connecting column 30 is away from the first pin shaft 35, and the first pin shaft 35 is no longer blocked by the connecting column 30. When the elastic force of the second elastic member 38 is released, the second pin shaft 39 moves in the direction close to the connecting column 30, and the second pin shaft 39 drives the movable plate to move in the direction of the connecting column 30, thereby causing the first pin shaft 35 to move in the direction close to the connecting column 30. The hook 36 falls under the action of gravity, and the rear door 100 can be opened smoothly.

[0042] When the staff closes the rear door 100, the connecting column 30 will contact the pin shaft and push the pin shaft to move in the direction close to the rotating piece 34, thereby moving the installation piece 33 in the direction close to the rotating piece 34, so that the installation piece 33 returns to the position where the mechanical lock 3 is in the locked state. At this time, the third connecting rope 6 and the fourth connecting rope 7 respectively connected to the two mechanical locks 3 are released at the same time, unlocking the three-position switch 1 and the circuit breaker 2, so that the three-position switch 1 and the circuit breaker 2 can be operated. At the same time, when the connecting column 30 resets the installation piece 33 by pushing the first pin shaft 35, the hook 36 will overlap the bottom surface of the fixed frame 31 and be located in the groove of the connecting column 30. When the staff operates the knife switch of the three-position switch 1 to other positions, the first connecting rope 4 is reset. The rotating piece 34 in the mechanical lock 3 connected to the three-position switch 1 is reset under the action of the first elastic member 37, and the mechanical lock 3 is restored to the locked state, so that the rear door 100 cannot be easily pulled. Alternatively, when the staff adjusts the circuit breaker 2 to other states, the second connecting rope 5 is reset, and the rotating piece 34 in the mechanical lock 3 connected to the circuit breaker 2 is reset under the action of the first elastic member 37, and the mechanical lock 3 is restored to the locked state, so that the rear door 100 cannot be easily pulled.

[0043] Further, a partition plate 201 is provided on the cabinet frame 200. The partition plate 201 is disposed on the side of the rotating piece 34 away from the fixed frame 31. The first elastic member 37 connects one end of the rotating piece 34 away from the movable piece 32 and the partition plate 201. When the mechanical lock 3 is in the locked state, the first elastic member 37 is in a compressed state. Thus, when the mechanical lock 3 is in the locked state, the end of the rotating piece 34 connected to the movable piece 32 has a tendency to move away from the connecting column 30, avoiding the generation of movable space for the mounting piece 33. Even if the staff pulls the rear door 100, the hook 36 will always be hooked in the groove, and the rear door 100 cannot be opened. During assembly, when the mechanical lock 3 is connected to the three-position switch 1, the first connecting rope 4 passes through the partition plate 201 and is connected to the rotating piece 34; when the mechanical lock 3 is connected to the circuit breaker 2, the second connecting rope 5 passes through the partition plate 201 and is connected to the rotating piece 34.

[0044] In this embodiment, both the first elastic member 37 and the second elastic member 38 can be selected as springs.

[0045] Further, a stop piece 202 is provided on the cabinet frame 200. The stop piece 202 is connected to the cabinet frame 200. The stop piece 202 is provided with a shielding portion, and the shielding portion is located on the side of the rotating piece 34 away from the connecting column 30. Thus, the shielding portion can limit the rotation range of the rotating piece 34, making the design of the mechanical lock 3 more reasonable.

[0046] Preferably, the connecting columns 30 of the two mechanical locks 3 are both fixed to the cabinet frame 200 by locking members 8. The locking members 8 include nuts and bolts. The bolts are used to lock the connecting columns 30 and the cabinet frame 200. The nuts are placed outside the cabinet body. If an emergency occurs in the gas-insulated switchgear, such as a failure of the three-position switch 1 or a failure of the circuit breaker 2, the staff can turn the locking member 8 by the nut placed outside the gas-insulated switchgear and remove the connecting columns 30 on the two mechanical locks 3, and then repair the inside of the gas-insulated switchgear. In this embodiment, the locking member 8 can be selected as a bolt.

[0047] In this embodiment, the first connecting rope 4, the second connecting rope 5, the third connecting rope 6 and the fourth connecting rope 7 are all steel wires, further improving the service life of the mechanical interlocking device.

[0048] Embodiment Two

[0049] This embodiment provides a gas-insulated switchgear, including the mechanical interlocking device in Embodiment One. The gas-insulated switchgear provided in this embodiment can only be opened when the knife switch of the three-position switch 1 is in the grounded position and the circuit breaker 2 is in the closed state, that is, when the whole gas-insulated switchgear is completely de-energized, making the gas-insulated switchgear meet the requirements of the "five-prevention" standard and effectively ensuring the safety of the staff during the maintenance of the gas-insulated switchgear.

[0050] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A mechanical interlocking device, characterized in that, Including: A three-position switch (1), a circuit breaker (2) and two mechanical locks (3). The two mechanical locks (3) lock the rear door (100) and the cabinet frame (200) of the gas-insulated switchgear together. The knife switch of the three-position switch (1) is connected to one of the mechanical locks (3) through a first connecting rope (4). When the knife switch of the three-position switch (1) is adjusted to the grounding position, the mechanical lock (3) connected to the three-position switch (1) can be changed from the locked state to the unlocked state; the switch of the circuit breaker (2) is connected to the other mechanical lock (3) through a second connecting rope (5). When the circuit breaker (2) is in the closed state, the mechanical lock (3) connected to the circuit breaker (2) can be changed from the locked state to the unlocked state.

2. The mechanical interlocking device according to claim 1, characterized in that, The mechanical interlocking device further includes a first switch and a second switch. The first switch is used to control the locking of the three-position switch (1). The first switch is connected to the mechanical lock (3) connected to the three-position switch (1) through a third connecting rope (6). When the rear door (100) is opened, the third connecting rope (6) can be pulled to turn on the first switch; the second switch is used to control the locking of the circuit breaker (2). The second switch is connected to the mechanical lock (3) connected to the circuit breaker (2) through a fourth connecting rope (7). When the rear door (100) is opened, the fourth connecting rope (7) can be pulled to turn on the second switch.

3. The mechanical interlocking device according to claim 2, wherein, The mechanical lock (3) includes a connecting column (30), a fixed frame (31), a movable piece (32), a mounting piece (33), a rotating piece (34), a first pin shaft (35), a hook (36), a first elastic member (37) and a second elastic member (38). The connecting column (30) is provided on the rear door (100). The fixed frame (31) is placed on the cabinet frame (200) and the opening faces the connecting column (30). The first pin shaft (35) is movably inserted through the side wall of the fixed frame (31). One end of the first pin shaft (35) close to the connecting column (30) is connected to the hook (36), and the other end is connected to the mounting piece (33). The movable piece (32) is movably connected to the cabinet frame (200). The mounting piece (33) is connected to the movable piece (32). When the movable piece (32) moves, the mounting piece (33) has a movable space. The rotating piece (34) connects the movable piece (32) and the first connecting rope (4). When the mechanical lock (3) is in the locked state, the first pin shaft (35) abuts against the connecting column (30), and the hook (36) overlaps the bottom surface of the fixed frame (31) and is placed in the groove of the connecting column (30); the first elastic member (37) is connected to the rotating piece (34) and has a tendency to move the end connecting the rotating piece (34) and the movable piece (32) away from the connecting column (30); the second elastic member (38) has a tendency to move the mounting piece (33) close to the connecting column (30); the third connecting rope (6) is connected to the mounting piece (33).

4. The mechanical interlocking device according to claim 3, wherein, The mounting piece (33) is provided with an oblong hole, and the movable piece (32) is provided with a mounting hole. The connecting pin passes through the oblong hole and the mounting hole.

5. The mechanical interlocking device according to claim 3, characterized in that, The mechanical lock (3) further includes a second pin shaft (39). The second pin shaft (39) is movably inserted through the side wall of the fixed frame (31) and is connected to the mounting piece (33). The second elastic member (38) is disposed between the head of the second pin shaft (39) and the side wall of the fixed frame (31). When the mechanical lock (3) is in the locked state, the second elastic member (38) is in a compressed state.

6. The mechanical interlocking device according to claim 3, characterized in that, A partition plate (201) is provided on the cabinet frame (200). The partition plate (201) is disposed on the side of the rotating piece (34) away from the fixed frame (31). The first elastic member (37) connects one end of the rotating piece (34) away from the movable piece (32) to the partition plate (201). When the mechanical lock (3) is in the locked state, the first elastic member (37) is in a compressed state.

7. The mechanical interlock device according to claim 3, characterized in that, A retaining piece (202) is further provided on the cabinet frame (200). The retaining piece (202) is connected to the cabinet frame (200). The retaining piece (202) is provided with a shielding portion, and the shielding portion is located on the side of the rotating piece (34) away from the connecting column (30).

8. The mechanical interlocking device according to claim 3, wherein The connecting columns (30) of the two mechanical locks (3) are both connected to the cabinet frame (200) through locking members (8). The locking members (8) include nuts and screws. The screws are used to lock the connecting columns (30) to the cabinet frame (200), and the nuts are disposed outside the gas-insulated switchgear.

9. The mechanical interlock device according to claim 2, wherein, The first connecting rope (4), the second connecting rope (5), the third connecting rope (6) and the fourth connecting rope (7) are all steel ropes.

10. An inflatable cabinet, characterized in that, It includes the mechanical interlocking device according to any one of claims 1-9.

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