CN220420463U

CN220420463U - Interlocking device and ring main unit

Info

Publication number: CN220420463U
Application number: CN202321468492.8U
Authority: CN
Inventors: 亢姣姣; 刘志彬; 成力波; 陈文博
Original assignee: Xidian Baoji Electric Co ltd; China XD Electric Co Ltd
Current assignee: Xidian Baoji Electric Co ltd; China XD Electric Co Ltd
Priority date: 2023-06-09
Filing date: 2023-06-09
Publication date: 2024-01-30
Anticipated expiration: 2033-06-09

Abstract

The utility model relates to the technical field of high-voltage electrical equipment, and particularly discloses an interlocking device and a ring main unit, when overhauling is performed, if a grounding switch is disconnected and is not grounded, the grounding switch is in contact with a linkage unit and limits the linkage unit to slide upwards relative to a frame, an interlocking actuating plate and a locking plate cannot be unlocked and separated, if the grounding switch is grounded, the interlocking actuating plate and the locking plate are unlocked and separated, at least part of the linkage unit is positioned between an operating hole and an operating piece, an operator cannot change the state of the grounding switch through the operating piece, the safety of the whole overhauling is ensured, the locking plate is detachably and fixedly connected with a lower cabinet door of the ring main unit, and when the lower cabinet door cannot be opened in a conventional mode due to emergency, the locking plate can be detached from the lower cabinet door, so that the lower cabinet door can be opened in emergency, and the timeliness of field fault treatment is improved.

Description

Interlocking device and ring main unit

Technical Field

The utility model relates to the technical field of high-voltage electrical equipment, in particular to an interlocking device and a ring main unit.

Background

The looped netowrk cabinet is widely used in the distribution substation and the box-type substation of load centers such as urban residential district, high-rise building, large-scale public building, mill enterprise, when the maintenance operation, in order to ensure safety, only can open down the cabinet door when the earthing switch of looped netowrk cabinet lower floor ground connection, simultaneously need ensure that the earthing switch can be in the ground connection state all the time when lower cabinet door is opened. The prior art sets up to act as go-between and earthing switch linkage, after earthing switch combined floodgate or separating brake, earthing switch's operating axle drives and acts as go-between unblock or lock cabinet door down to can open or close down cabinet door, but with the live time extension, the easy scheduling problem that fatigue appears in the act as go-between leads to the action of unblock cabinet door down inaccurately or can't lock cabinet door down. The prior art provides an interlocking device of shift fork, drives the shift fork through the operating shaft of earthing switch, drives the bolt by the shift fork and realizes locking or unblock of cabinet door down, but the device can not guarantee that earthing switch is in the ground state all the time under cabinet door open state down, and operating personnel still can carry out the brake operation of separating from the earthing switch under cabinet door open state down, still exists the security risk.

Disclosure of Invention

The utility model aims to provide an interlocking device and a ring main unit, which are used for solving the problem that the grounding switch cannot be always in a grounding state when the lower cabinet door of the existing shifting fork interlocking mechanism is opened.

The utility model provides an interlocking device which is used for a ring main unit, the ring main unit comprises a main unit body and a lower cabinet door, the interlocking device comprises an operating mechanism and an interlocking mechanism, the operating mechanism is connected with the main unit body, the operating mechanism comprises a grounding switch, the grounding switch is arranged in the main unit body, the grounding switch comprises an operating piece, the operating piece is used for changing the connection or disconnection of the grounding switch, an operating hole is formed in the operating mechanism, the operating piece is aligned with the operating hole, the interlocking mechanism comprises a frame, an interlocking actuating plate, a locking plate and a linkage unit, the frame is fixedly connected with the main unit body, one end of the interlocking actuating plate can rotate relative to the main unit body, the locking plate is detachably and fixedly connected with the lower cabinet door, the other end of the interlocking actuating plate can be locked or separated from the locking plate, the linkage unit can slide up and down relative to the frame and drive the other end of the interlocking actuating plate to be separated or locked from the locking plate, at least part of the linkage unit can be positioned between the operating hole and the operating piece, the grounding switch can be contacted with the linkage unit and the locking unit and limit the unit to slide upwards relative to the frame.

As the preferable technical scheme of the interlocking device, the interlocking unit comprises an interlocking contact plate, the interlocking contact plate can slide up and down relative to the frame, the interlocking mechanism further comprises an interlocking pull plate, the interlocking pull plate is fixedly connected with the interlocking contact plate, and the interlocking actuating plate is rotationally connected with the interlocking pull plate.

As the preferable technical scheme of interlock, the frame includes limiting plate and lower limiting plate, goes up limiting plate and lower limiting plate parallel arrangement, and the interlocking contact plate sets up between last limiting plate and lower limiting plate, and the linkage unit still includes the direction piece that resets, and the direction resets and frame connection, and the direction resets and is used for driving the interlocking contact plate and slides towards last limiting plate.

As the preferable technical scheme of interlock, the guide reset piece includes guiding axle and compression spring, and guiding axle and last limiting plate fixed connection, interlock contact plate slidable cover is established on the guiding axle, and compression spring's at least partial cover is established on the guiding axle, compression spring's bottom and lower limiting plate butt, compression spring's top and interlock contact plate butt.

As the preferable technical proposal of the interlocking device, the cabinet body is fixedly connected with a shaft seat, and one end of the interlocking actuating plate is rotationally connected with the shaft seat through a rotating shaft.

As the preferable technical scheme of the interlocking device, the interlocking actuating plate comprises an actuating plate body and a lock hook, the actuating plate body and the lock hook are integrally arranged, and the actuating plate body and the lock hook are formed with accommodating yielding grooves which are used for accommodating lock catches of the lock plate.

As the preferable technical scheme of the interlocking device, the interlocking device further comprises an interlocking pressing plate, the interlocking pressing plate is fixedly connected with the interlocking pulling plate, the interlocking pressing plate is arranged below the interlocking actuating plate, and the interlocking pressing plate can be in contact with the locking plate.

The utility model provides a ring main unit, which comprises a cabinet body, a lower cabinet door and an interlocking device in any scheme, wherein the interlocking device is connected with the cabinet body, and the lower cabinet door can be opened or closed relative to the cabinet body.

As the preferable technical scheme of looped netowrk cabinet, earthing switch switches on and when lower cabinet door is opened for the cabinet body, the other end and the locking plate separation of interlocking actuation plate, the at least part of linkage unit is located between operating hole and the operating piece.

As the preferable technical scheme of the ring main unit, when the grounding switch is disconnected and the lower cabinet door is closed relative to the cabinet body, the grounding switch is contacted with the linkage unit and limits the linkage unit to slide upwards relative to the frame.

The beneficial effects of the utility model are as follows:

the utility model provides an interlocking device which is used for a ring main unit, the ring main unit comprises a main unit body and a lower cabinet door, the interlocking device comprises an operating mechanism and an interlocking mechanism, the operating mechanism is connected with the main unit body, the operating mechanism comprises a grounding switch, the grounding switch is arranged in the main unit body, the grounding switch comprises an operating piece, the operating piece is used for changing the connection or disconnection of the grounding switch, an operating hole is formed in the operating mechanism, the operating piece is aligned with the operating hole, the interlocking mechanism comprises a frame, an interlocking actuating plate, a locking plate and a linkage unit, the frame is fixedly connected with the main unit body, one end of the interlocking actuating plate is rotatably connected with the main unit body, the locking plate is detachably and fixedly connected with the lower cabinet door, the other end of the interlocking actuating plate can be locked or separated from the locking plate, the linkage unit can slide up and down relative to the frame and drive the other end of the interlocking actuating plate to be separated or locked from the locking plate, at least part of the linkage unit can be positioned between the operating hole and the operating piece, the grounding switch can be contacted with the linkage unit and limit the locking unit to slide upwards relative to the frame. When overhauling, if the grounding switch is disconnected and is not grounded, the grounding switch is in contact with the linkage unit and limits the linkage unit to slide upwards relative to the frame, the interlocking actuating plate and the locking plate cannot be unlocked and separated, if the grounding switch is grounded, the interlocking actuating plate and the locking plate are unlocked and separated, at least part of the linkage unit is positioned between the operation hole and the operation piece, the state of the grounding switch cannot be changed by the operation piece by the operation personnel, and the safety of the whole process of overhauling is ensured.

Drawings

Fig. 1 is a schematic structural diagram of a mesh enclosure in a first view angle according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a mesh enclosure in a second view according to an embodiment of the present utility model;

FIG. 3 is a schematic view of an interlock device according to an embodiment of the present utility model in a first view;

fig. 4 is a schematic structural diagram of an interlock device according to an embodiment of the present utility model at a second view angle.

In the figure:

1. an operating mechanism; 11. an operation hole;

2. an interlocking mechanism; 21. a frame; 22. interlocking contact plates; 23. a guide shaft; 24. a compression spring; 25. interlocking pull plates; 26. a shaft seat; 27. a rotating shaft; 28. an interlocking actuation plate; 281. an actuation plate body; 282. a latch hook; 283. a storage groove; 29. an interlocking pressing plate;

3. a lock plate;

4. and a lower cabinet door.

Detailed Description

The following description of the embodiments of the present utility model will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first location" and "second location" are two distinct locations and wherein the first feature is "above," "over" and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is level above the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood as appropriate by those of ordinary skill in the art.

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In this regard, this embodiment provides interlock and looped netowrk cabinet, and this looped netowrk cabinet can also realize ground switch and lower cabinet door interlocking through setting up interlock, can also solve above-mentioned problem.

As shown in fig. 1-4, the present utility model provides a ring main unit, which includes a main unit body and a lower cabinet door 4, where the lower cabinet door 4 can be opened or closed with respect to the main unit body. An interlocking device is arranged in the cabinet body and is fixedly connected with the cabinet body. The interlocking device comprises an operating mechanism 1 and an interlocking mechanism 2, wherein the operating mechanism 1 is fixedly connected with the cabinet body, the operating mechanism 1 comprises a grounding switch, the grounding switch is arranged inside the cabinet body, the grounding switch comprises an operating piece, and the operating piece is used for changing the connection or disconnection of the grounding switch. The operating member in this embodiment may be either manual or electric. When the grounding switch is conducted, the operating piece is in a closing state, and the grounding switch is grounded. When the grounding switch is disconnected, the operating piece is in a brake-separating state, and the grounding switch is not grounded. The operating mechanism 1 is provided with an operating hole 11, and the operating piece is aligned with the operating hole 11. The interlocking mechanism 2 comprises a frame 21, an interlocking actuating plate 28, a locking plate 3 and a linkage unit, and the frame 21 is fixedly connected with the cabinet body. One end of the interlocking actuating plate 28 can rotate relative to the cabinet body, the locking plate 3 is detachably and fixedly connected with the lower cabinet door 4, and the other end of the interlocking actuating plate 28 can be locked or separated from the locking plate 3. The linkage unit can slide up and down relative to the frame 21 and drive the other end of the interlocking plate 28 to be separated or locked from the lock plate 3. When the linkage unit slides upwards relative to the frame 21, the other end of the interlocking plate 28 is driven to be separated from the lock plate 3. When the linkage unit slides downwards relative to the frame 21, the other end of the interlocking actuating plate 28 is driven to unlock and lock with the locking plate 3. At least a portion of the linkage unit can be located between the operation hole 11 and the operation piece, and the ground switch can contact the linkage unit and restrict the linkage unit from sliding upward with respect to the frame 21. When the maintenance operation is performed, if the grounding switch is disconnected and is not grounded, the grounding switch is in contact with the linkage unit and limits the linkage unit to slide upwards relative to the frame 21, the interlocking actuating plate 28 and the locking plate 3 cannot be unlocked and separated, if the grounding switch is grounded, and the interlocking actuating plate 28 and the locking plate 3 are unlocked and separated, at least part of the linkage unit is located between the operation hole 11 and the operation piece, an operator cannot change the state of the grounding switch by operating the operation piece, and the safety of the whole maintenance operation process is ensured.

Specifically, the linkage unit includes an interlocking contact plate 22, and the interlocking contact plate 22 is capable of sliding up and down with respect to the frame 21. The interlocking mechanism 2 further comprises an interlocking pull plate 25, the interlocking pull plate 25 is fixedly connected with the interlocking contact plate 22, and the interlocking pull plate 25 is rotatably connected with the interlocking actuating plate 28. The interlocking contact plate 22 slides up and down relative to the frame 21, driving the interlocking pull plate 25 fixedly connected thereto to move up and down. Because one end of the interlocking plate 28 is rotatably connected with the cabinet body, in the process of up-and-down movement of the interlocking plate 25, the interlocking plate 25 and the interlocking plate 28 rotate relatively, and meanwhile, the interlocking plate 28 is driven to swing around the connection point of the interlocking plate and the cabinet body, so that the other end of the interlocking plate moves upwards or downwards, and the separation or locking of the interlocking plate and the locking plate 3 is realized.

Further, the frame 21 includes an upper limit plate and a lower limit plate, which are disposed in parallel. The interlocking contact plate 22 is disposed between the upper and lower limiting plates, and the interlocking contact plate 22 slides up and down between the upper and lower limiting plates. The linkage unit further includes a guide return member connected to the frame 21, the guide return member being for driving the interlocking contact plate 22 to slide toward the upper limit plate. The guiding reset piece in this embodiment may have various combinations, such as a hydraulic stay bar, where one end of the hydraulic stay bar is fixedly connected with the lower limiting plate, the other end of the hydraulic stay bar is fixedly connected with the interlocking contact plate 22, and a piston rod of the hydraulic stay bar is connected with the interlocking contact plate 22, so as to drive the interlocking contact plate 22 to slide towards the upper limiting plate. The guide return member in this embodiment may be a combination of the guide shaft 23 and the compression spring 24. The guide shaft 23 is fixedly connected with the upper limiting plate, and the interlocking contact plate 22 is slidably sleeved on the guide shaft 23. At least part of the compression spring 24 is sleeved on the guide shaft 23, the bottom of the compression spring 24 is abutted with the lower limiting plate, and the top of the compression spring 24 is abutted with the interlocking contact plate 22. The compression spring 24 keeps the interlocking contact plate 22 having a tendency to slide toward the upper limit plate, while the guide shaft 23 ensures accurate sliding movement of the interlocking contact plate 22. In this embodiment, the two ends of the guide shaft 23 are preferably fixedly connected to the upper and lower limiting plates, respectively, so as to enhance the reliability of the structure.

Further, as shown in fig. 3-4, in order to reduce the maintenance difficulty of the interlocking device, a shaft seat 26 is fixedly connected to the cabinet body, and one end of an interlocking plate 28 is rotatably connected to the shaft seat 26 through a rotating shaft 27. The interlocking actuating plate 28 is rotatably connected with the interlocking pulling plate 25 through the other rotating shaft 27, and when the interlocking actuating plate 28 or the rotating shaft 27 is damaged or worn seriously, corresponding parts can be quickly replaced, so that maintenance difficulty is reduced.

Specifically, as shown in fig. 3 to 4, the interlock actuating plate 28 includes an actuating plate body 281 and a latch hook 282, and the actuating plate body 281 and the latch hook 282 are integrally provided. The plate body 281 and the latch hook 282 are formed with receiving recess 283. The accommodating recess 283 is used for accommodating the lock catch of the lock plate 3. In this embodiment, the locking engagement of the locking hooks 282 of the actuation plate with the locking plate 3 completes the locking of the interlocking actuation plate 28 and locking plate 3. In fig. 2, the interlocking contact plate 22 is in contact with the upper limit plate, the interlocking contact plate 22 is in the upper limit position, the corresponding interlocking actuation plate 28 is in a horizontal state, and the interlocking actuation plate 28 and the lock plate 3 are in an unlocked and separated state. In the process of separating the interlocking actuating plate 28 from the locking plate 3, the interlocking actuating plate 28 swings downwards around the pin shaft on the shaft seat 26 under the driving action of the interlocking pulling plate 25. In this process, the lock catch of the lock plate 3 is first located in the direction away from the lock hook 282 in the accommodating recess 283, and as the interlock actuating plate 28 swings downward, the lock catch gradually approaches toward the direction close to the lock hook 282 in the accommodating recess 283 until the lock catch contacts and locks with the lock hook 282. The accommodating recess 283 is provided to prevent the locking operation from being impossible due to the interference between the lock catch and the interlocking plate 28.

Optionally, the interlock further comprises an interlock platen 29. The interlocking pressing plate 29 is fixedly connected with the interlocking pulling plate 25, and the interlocking pressing plate 29 is arranged below the interlocking actuating plate 28. The lock plate 3 is provided between an interlocking pressing plate 29 and an interlocking actuating plate 28, and the interlocking pressing plate 29 can be brought into contact with the lock plate 3. When the interlocking plate 28 is locked with the locking plate 3, the locking plate 3 presses the interlocking pressing plate 29 to move downwards, the interlocking contact plate 22 is driven by the interlocking pulling plate 25 to press the compression spring 24 to move downwards, and the interlocking plate 28 swings downwards and is locked with the locking plate 3. The arrangement of the interlocking pressing plate 29 ensures the accuracy of the actions of the locking plate 3 and the interlocking actuating plate 28 in the locking process.

It should be noted that, as the prior art, the grounding switch can be grounded when turned on and cannot be grounded when turned off. When the ground switch is operated to switch the state, the relevant parts of the operating mechanism 1 correspondingly act. The interlocking of the earthing switch with the lower cabinet door 4 can be achieved by setting the relevant means according to this action. In different usage environments, the positions of the components that operate when the grounding switch state is switched on the operating mechanism 1 are different, and the manner of operation is also different, so that the present utility model is not limited in detail herein. Those skilled in the art can select and arrange interlocking means that can be matched to them as desired. In this embodiment, when the grounding switch is turned on, the operating lever on the operating mechanism 1 is at an upper limit position, and the vertical height of the upper limit position is higher than the height of the upper limit plate of the frame 21. When the grounding switch is turned off, the operating lever on the operating mechanism 1 is at a lower limit position, and the vertical height of the lower limit position is lower than the height of the upper limit plate of the frame 21 and higher than the height of the lower limit plate.

Specifically, when the grounding switch of the ring main unit is turned on, the operating lever is at an upper limit position. At this time, if the lower cabinet door 4 is closed relative to the cabinet body, that is, the lower cabinet door 4 is fixedly connected with the cabinet body, the connection mode of the lower cabinet door 4 and the cabinet body is preferably screw connection. The locking plate 3 on the cabinet door is locked with the interlocking actuating plate 28, the interlocking actuating plate 28 drives the interlocking pull plate 25 to move downwards, and then drives the interlocking contact plate 22 to move downwards against the elastic force of the compression spring 24, and at the moment, the interlocking contact plate 22 and the upper limiting plate are spaced. At this time, the grounding switch is turned on, the operating rod is at the upper limit position, and the lower cabinet door 4 can be opened relative to the cabinet body. Specifically, the screw connecting the lower cabinet door 4 and the cabinet body is taken down, the lower cabinet door 4 is pushed upwards, the interlocking actuation plate 28 is driven to swing upwards, and therefore the interlocking actuation plate is separated from the locking plate 3, meanwhile, under the driving of the interlocking actuation plate 28, the interlocking pull plate 25 drives the interlocking contact plate 22 to move upwards, and under the action of the compression spring 24, the interlocking contact plate 22 is abutted with the upper limiting plate. The interlock contact plate 22 is located between the operating hole 11 and the operating member of the grounding switch at this time, so that the operating member is not accessible to the operator through the operating hole 11 due to the shielding effect of the interlock contact plate 22. Therefore, when the lower door of the ring main unit is not closed, the grounding switch cannot be disconnected.

Further, when the grounding switch of the ring main unit is turned off and the lower cabinet door 4 is closed relative to the cabinet body, the operation lever is at a lower limit position, and when the operation lever is at the lower limit position, the operation lever contacts with the interlocking contact plate 22 and limits the upward movement of the interlocking contact plate 22. Although there is detection between the interlocking contact plate 22 and the upper limit plate, the interlocking contact plate 22 cannot move upward under the restriction of the operation lever, and at this time, the lower cabinet door 4 cannot be opened. Therefore, when the grounding switch is disconnected, the lower cabinet door 4 of the ring main unit cannot be opened. And then realize only when the earthing switch of looped netowrk cabinet switches on, just can open the lower cabinet door 4 of looped netowrk cabinet.

Alternatively, in actual use, there may be a special case such as a fault of the grounding switch or other reasons when the lower cabinet door 4 needs to be opened in an emergency, and there may be a case that the grounding switch cannot be turned on or remains turned off all the time, so that the lower cabinet door 4 cannot be opened in a conventional manner. The lock plate 3 and the lower cabinet door 4 in this embodiment are detachably and fixedly connected by screws, and the nuts of the screws are arranged on the outer side of the lower cabinet door 4. After this, the screws for fixing the lock plate 3 can be removed from the outside of the lower cabinet door 4, so that the lock plate 3 is detached from the upper cabinet door while being separated from the interlocking actuating plate 28. When the cabinet door is pushed upwards, the lock plate 3 is separated from the interlocking actuating plate 28, so that the action of the lower cabinet door 4 is not transmitted to the interlocking device, and the lower cabinet door 4 can be opened in an emergency, and the timeliness of fault treatment is improved.

The interlocking device has the function of emergency unlocking, and the timeliness of field fault processing is improved. Meanwhile, all parts of the interlocking device are sheet metal parts, so that the difficulty in machining and manufacturing is low, and compared with the traditional stay wire type structure, the interlocking device is higher in strength and better in reliability. Meanwhile, the parts matched with each other are in clearance fit, so that abrasion is reduced on the premise of ensuring action precision, and the service life is prolonged.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

1. Interlocking device for the looped netowrk cabinet, the looped netowrk cabinet includes cabinet body and lower cabinet door (4), its characterized in that includes:

the operation mechanism (1), the operation mechanism (1) is connected with the cabinet body, the operation mechanism (1) comprises a grounding switch, the grounding switch is arranged inside the cabinet body, the grounding switch comprises an operation piece, the operation piece is used for changing the connection or disconnection of the grounding switch, an operation hole (11) is formed in the operation mechanism (1), and the operation piece is aligned with the operation hole (11);

an interlock mechanism (2) comprising:

the frame (21), the said frame (21) is fixedly connected with said cabinet;

an interlock actuation plate (28), one end of the interlock actuation plate (28) being rotatable relative to the cabinet;

the lock plate (3), the lock plate (3) is detachably and fixedly connected with the lower cabinet door (4), and the other end of the interlocking actuating plate (28) can be locked or separated from the lock plate (3);

and the linkage unit can slide up and down relative to the frame (21) and drive the other end of the interlocking actuating plate (28) to be separated from or locked with the locking plate (3), at least part of the linkage unit can be positioned between the operation hole (11) and the operation piece, and the grounding switch can be in contact with the linkage unit and limit the linkage unit to slide upwards relative to the frame (21).

2. The interlocking device according to claim 1, wherein the interlocking unit comprises an interlocking contact plate (22), the interlocking contact plate (22) can slide up and down relative to the frame (21), the interlocking mechanism (2) further comprises an interlocking pull plate (25), the interlocking pull plate (25) is fixedly connected with the interlocking contact plate (22), and the interlocking actuation plate (28) is rotatably connected with the interlocking pull plate (25).

3. Interlocking device according to claim 2, characterized in that the frame (21) comprises an upper limit plate and a lower limit plate, which are arranged in parallel, the interlocking contact plate (22) being arranged between the upper limit plate and the lower limit plate, the interlocking unit further comprising a guiding reset element connected to the frame (21), the guiding reset element being adapted to drive the interlocking contact plate (22) to slide towards the upper limit plate.

4. An interlocking device according to claim 3, characterized in that the guide reset member comprises a guide shaft (23) and a compression spring (24), the guide shaft (23) is fixedly connected with the upper limit plate, the interlocking contact plate (22) is slidably sleeved on the guide shaft (23), at least part of the compression spring (24) is sleeved on the guide shaft (23), the bottom of the compression spring (24) is abutted with the lower limit plate, and the top of the compression spring (24) is abutted with the interlocking contact plate (22).

5. The interlocking device according to claim 2, wherein the cabinet body is fixedly connected with a shaft seat (26), and one end of the interlocking actuation plate (28) is rotatably connected with the shaft seat (26) through a rotating shaft (27).

6. The interlocking device according to claim 5, wherein the interlocking actuation plate (28) comprises an actuation plate body (281) and a latch hook (282), the actuation plate body (281) and the latch hook (282) being integrally provided, the actuation plate body (281) and the latch hook (282) being formed with a receiving recess (283) for receiving a catch of the latch plate (3).

7. The interlocking device according to claim 6, further comprising an interlocking press plate (29), wherein the interlocking press plate (29) is fixedly connected with the interlocking pull plate (25), the interlocking press plate (29) is arranged below the interlocking actuation plate (28), and the interlocking press plate (29) can be in contact with the locking plate (3).

8. Ring main unit, comprising a main body and a lower cabinet door (4), characterized in that it further comprises an interlocking device according to any one of claims 1-7, said interlocking device being connected to said main body, said lower cabinet door (4) being openable or closable with respect to said main body.

9. Ring main unit according to claim 8, characterized in that the other end of the interlocking actuation plate (28) is separated from the locking plate (3) when the earthing switch is turned on and the lower cabinet door (4) is opened relative to the cabinet body, at least part of the interlocking unit being located between the operating hole (11) and the operating piece.

10. The ring main unit according to claim 8, characterized in that when the grounding switch is opened and the lower cabinet door (4) is closed with respect to the cabinet body, the grounding switch contacts the linkage unit and limits the linkage unit to slide upwards with respect to the frame (21).