Power distribution cabinet and interlocking mechanism thereof

Abstract

The utility model relates to a power distribution cabinet and an interlocking mechanism thereof. The power distribution cabinet comprises a grounding switch and a handcart chamber, and the interlocking mechanism comprises a first rotating shaft which can rotate around the central axis of the first rotating shaft in a first direction and drive the grounding switch to be switched on, and can rotate in a second direction opposite to the first direction and drive the grounding switch to be switched off; a locking member configured to move in response to the rotation of the first rotating shaft along the second direction to restrain the door of the handcart chamber in a closed state, and move in response to the rotation of the first rotating shaft along the first direction to release the restriction on the door; a gear transmission mechanism performing power transmission between the first rotating shaft and the locking member; and the positioning assembly is constructed to move to restrain the rotation of the first rotating shaft in response to the opening of the door and move to release the restrain in response to the closing of the door.

Description

Technical Field

[0001] The utility model relates to the technical field of power distribution facility safety assurance, in particular to a power distribution cabinet and an interlocking mechanism thereof. Background Art

[0002] In order to meet the market demand for high current and small space, a new contactor distribution cabinet has been developed, whose width can be reduced to less than 500 mm, for example, 400 mm, and the rated current can reach 400 A. In order to ensure the safe operation of the power grid, ensure the safety of equipment and personnel, and prevent misoperation, the distribution cabinet must meet the five-protection interlocking requirements, so that the front door of the trolley room can be opened only after the contactor trolley is in the test position and the grounding switch is closed.

[0003] Therefore, the problem that needs to be solved at present is to design an interlocking mechanism that meets safety requirements and has a compact structure to adapt to distribution cabinets of various sizes, while also taking into account high structural strength and transmission accuracy. Utility Model Content

[0004] The utility model aims to provide an interlocking mechanism which can at least solve some of the above technical problems.

[0005] The utility model also aims to provide a power distribution cabinet using the improved interlocking mechanism.

[0006] According to one aspect of the utility model, an interlocking mechanism for a power distribution cabinet is provided, wherein the power distribution cabinet includes a grounding switch and a trolley room, and the interlocking mechanism includes: a first rotating shaft, which can rotate in a first direction around its own central axis and drive the grounding switch to close, and rotate in a second direction opposite to the first direction and drive the grounding switch to open; a locking member, which is configured to move to constrain the door of the trolley room in a closed state in response to the first rotating shaft rotating in the second direction, and to move to release the constraint on the door in response to the first rotating shaft rotating in the first direction; a gear transmission mechanism, which performs power transmission between the first rotating shaft and the locking member; a positioning assembly, which is configured to move to constrain the rotation of the first rotating shaft in response to the door opening, and to move to release the constraint in response to the door closing.

[0007] The interlocking mechanism provided by this solution ensures high transmission accuracy and high structural strength through gear interlocking. The adopted gear transmission mechanism achieves reliable performance through fewer parts and effectively reduces the structural size, which can be adapted to small space distribution cabinets and distribution facilities of other sizes.

[0008] In some embodiments, the interlocking mechanism includes an arm extending from the first rotating shaft at an angle to the central axis, and the arm is configured to move to limit the movement of the trolley in the trolley chamber from the test position to the working position during the rotation of the first rotating shaft in a first direction, and to move to release the restriction during the rotation of the first rotating shaft in a second direction.

[0009] In some embodiments, the arm is configured to be blocked by the trolley and limited in movement after the trolley is moved to the working position.

[0010] In some embodiments, the interlocking mechanism includes a second rotating shaft parallel to and spaced apart from the first rotating shaft, the locking member is connected to the second rotating shaft, and the gear transmission mechanism includes: a first gear connected to the first rotating shaft; a second gear connected to the second rotating shaft and meshing with the first gear.

[0011] In some embodiments, the positioning assembly includes: a positioning member connected to the first rotating shaft and having a positioning groove; a movable member configured to be driven by the door moving in the closing direction to withdraw from the positioning groove to release the constraint on the first rotating shaft; and a biasing member configured to apply a biasing force to the movable member so that it is inserted into the positioning groove to constrain the rotation of the first rotating shaft.

[0012] In some embodiments, the movable part includes: a movable frame, connected to the first rotating shaft and capable of axially moving along the first rotating shaft; a first rod, passing through the movable frame; wherein the biasing member applies a biasing force toward the positioning groove to the movable frame to drive the first rod to insert into the positioning groove, and the movable frame can be driven by the door moving in the closing direction, so that the first rod withdraws from the positioning groove.

[0013] In some embodiments, the interlocking mechanism includes a fixed frame fixed relative to the cabinet body of the distribution cabinet, and the positioning assembly includes a second rod parallel to the first rod and passing through the movable frame and the fixed frame, wherein the biasing member is constructed as a compression spring sleeved on the second rod and resting between the fixed frame and the movable frame.

[0014] In some embodiments, the first rotating shaft passes through the fixing frame.

[0015] In some embodiments, the power distribution cabinet is provided with a fixed seat, the fixed seat has a protrusion, the first rotating shaft is provided with a limit member, the limit member has a circumferentially extending limit groove, the protrusion is embedded in the limit groove, and during the rotation of the first rotating shaft in two directions, the protrusion respectively forms a stop fit with two circumferentially opposite end walls of the limit groove.

[0016] According to another aspect of the utility model, a power distribution cabinet is provided, comprising a grounding switch, a trolley room and an interlocking mechanism, wherein the interlocking mechanism is the aforementioned interlocking mechanism.

[0017] Some of the other features and advantages of the present invention will be apparent to those skilled in the art after reading this application, and the other parts will be described in the following specific embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, wherein:

[0019] Figure 1 is a partial schematic diagram of the interior of a power distribution cabinet according to an embodiment of the utility model, wherein a grounding switch, an interlocking mechanism and a part of a front door are shown;

[0020] Figure 2 is a schematic diagram of an interlocking mechanism according to an embodiment of the utility model;

[0021] Figure 3 It is a partial schematic diagram of the interlocking mechanism according to an embodiment of the utility model.

[0022] Description of reference numerals:

[0023] 1-door; 2-fixed seat; 21-protrusion; 3-fixed frame; 31-first bracket; 32-second bracket

[0024] Frame; 4-interlocking mechanism; 41-first rotating shaft; 42-limiting member; 421-limiting groove; 43-first

[0025] a gear; 44-a second gear; 45-a second shaft; 46-a locking member; 461-a locking portion; 4

[0026] 62-avoidance part; 47-positioning assembly; 471-movable frame; 472-first rod; 473-pin; 47

[0027] 4-positioning member; 475-positioning slot; 476-second rod; 477-pin; 478-biasing member; 48-

[0028] Stopper; 49-arm; 5-transmission mechanism; 6-grounding switch DETAILED DESCRIPTION

[0029] Now, with reference to the accompanying drawings, the schematic scheme of the power distribution cabinet and its interlocking mechanism disclosed by the utility model is described in detail. Although the accompanying drawings are provided to present some embodiments of the utility model, the accompanying drawings do not have to be drawn according to the dimensions of the specific implementation scheme, and certain features may be enlarged, removed or partially cut to better illustrate and explain the disclosure of the utility model. Some components in the accompanying drawings can be adjusted in position according to actual needs without affecting the technical effect. The phrase "in the accompanying drawings" or similar terms appearing in the specification do not necessarily refer to all drawings or examples.

[0030] Certain directional terms used to describe the drawings below, such as "inside", "outside", "above", "below" and other directional terms, will be understood to have their normal meanings and refer to those directions involved when the drawings are normally viewed. Unless otherwise specified, the directional terms described in this specification are basically in accordance with the conventional directions understood by those skilled in the art.

[0031] The terms "first", "first", "second", "second" and the like used in the present invention do not indicate any order, quantity or importance, but are used to distinguish one component from other components.

[0032] The distribution cabinet is provided with a trolley room for trolleys to enter and exit, and a grounding device is arranged inside the cabinet to ensure the safe operation of the equipment. The interlocking mechanism proposed in the utility model transmits power by using a gear transmission mechanism between the operating shaft of the grounding switch and the front door of the trolley room, thereby reducing the size of the mechanism while improving the transmission accuracy and structural strength. The gear interlocking makes the interlocking mechanism more reliable, eliminates the safety hazards caused by misoperation, and meets the requirements of the five-protection interlocking.

[0033] Figure 1A part of the distribution cabinet is shown, in which the grounding switch and the interlocking mechanism are mainly shown. As shown in the figure, the grounding switch 6 is driven by the first rotating shaft 41 of the interlocking mechanism 4 to realize opening and closing. Specifically, during the period when the first rotating shaft 41 rotates around its own central axis in a first direction (for example, clockwise as shown in the figure), the grounding switch 6 can be driven to close, and during the period when the first rotating shaft 41 rotates around the central axis in a second direction opposite to the first direction (for example, counterclockwise as shown in the figure), the grounding switch 6 can be driven to open. The first end of the first rotating shaft 41 close to the door 1 of the handcart room is the operating end, and the operator can use the operating handle to pass through the opening on the cabinet body of the distribution cabinet to engage the operating end, thereby controlling the first rotating shaft 41 to rotate in the first direction or the second direction. The door 1 is, for example, the front door of the handcart room. The second end of the first rotating shaft 41 opposite to the first end extends close to the grounding switch 6, and the second end is connected to the grounding switch 6 as a driving end. A transmission mechanism 5 can be provided between the driving end of the first rotating shaft 41 and the grounding switch 6 to perform power transmission. The figure shows a gear transmission mechanism, which includes two sets of opposing bevel gears, wherein each set of bevel gears is composed of two bevel gears whose rotation axes are perpendicular to each other. In addition, the gear transmission mechanism can be replaced by any suitable power transmission mechanism, such as a linear power transmission mechanism.

[0034] Figure 2 and Figure 3 An example of an interlocking mechanism 4 is shown. As shown in the figure, the interlocking mechanism 4 is configured to release the door 1 to allow it to open while the first rotating shaft 41 rotates in the first direction and drives the grounding switch 6 to close. After the door 1 is fully opened, the first rotating shaft 41 can be interlocked to prevent the first rotating shaft 41 from being operated by mistake to open the grounding switch 6. The rotation of the first rotating shaft 41 in the first direction also provides a movement restriction for the hand car, prohibiting it from moving from the test position to the working position. The interlocking mechanism 4 is also configured to release the first rotating shaft 41 after the door 1 is fully closed, so that the operator can operate the first rotating shaft 41 to rotate in the second direction from outside the distribution cabinet to drive the grounding switch 6 to open. As the first rotating shaft 41 moves in the second direction, the closed door 1 is locked and cannot be opened, and the movement restriction of the hand car is released, so that it can move from the test position to the working position. When the hand car moves to the working position, the movement restriction of the first rotating shaft 41 is formed again, so that the first rotating shaft 41 will not be rotated by mistake. Thus, a reliable interlocking mechanism is formed.

[0035] The first rotating shaft 41 is rotatably passed through the fixed frame 3 fixed in the cabinet. A mounting frame can be provided on the inner wall of the cabinet, and a stopper 48, such as a hook or a sleeve, can be provided on the mounting frame, which is sleeved on the first rotating shaft 41 to limit the radial and axial movement of the first rotating shaft 41, but will not hinder the rotation of the first rotating shaft 41 in the first direction and the second direction. In the illustrated embodiment, the fixed frame 3 is composed of a first bracket 31 and a second bracket 32 ​​arranged side by side, for example, by welding or bolt connection, wherein the first bracket 31 and the second bracket 32 ​​each enclose a receiving space. The first rotating shaft 41 passes through the first bracket 31 and the second bracket 32. Alternatively, the fixed frame 3 can also be a single bracket fixed to the cabinet for mounting the first rotating shaft 41. A locking member 46 capable of forming a locking and unlocking match with the door 1 is provided in the cabinet near the door 1 of the trolley room. The gear transmission mechanism is connected between the first rotating shaft 41 and the locking member 46 to achieve power transmission. Specifically, a second rotating shaft 45 parallel to the first rotating shaft 41 is passed through the fixed frame 3. The first gear 43 is sleeved on the first rotating shaft 41 and cannot move relative to the first rotating shaft 41, the second gear 44 meshing with the first gear 43 is sleeved on the second rotating shaft 45 and cannot move relative to the second rotating shaft 45, and the locking member 46 is also sleeved on the second rotating shaft 45 and cannot move relative to the second rotating shaft 45. During the rotation of the first rotating shaft 41, the first gear 43 rotates synchronously and drives the second gear 44 to rotate, thereby driving the second rotating shaft 45 to rotate, so that the locking member 46 can rotate to insert its locking portion 461 into the lock of the door 1, or rotate to avoid the lock of the door 1 with its locking portion 461. In the illustrated embodiment, the first gear 43 and the second gear 44 can be in the accommodating space of one of the brackets, such as the first bracket 31 close to the door 1.

[0036] Although the locking member 46 is shown in the figure as a turntable-like shape, those skilled in the art will understand that the locking member 46 can be replaced with any suitable configuration as long as it can be locked or unlocked with the door 1 in synchronization with the rotation of the first rotating shaft 41. For example, in an embodiment not shown, the locking member 46 is configured as a lock pin installed at an angle to the second rotating shaft 45, which can be inserted into the lock opening of the door 1 or disengaged from the lock opening as the second rotating shaft 45 rotates.

[0037] During the period when the first rotating shaft 41 rotates in the first direction and drives the grounding switch 6 to close, the locking member 46 rotates in the second direction through the gear transmission mechanism until its locking portion 461 leaves the lock opening of the door 1, at which time the recessed escape portion 462 of the locking portion 461 is aligned with the lock opening, thereby releasing the constraint on the door 1 and allowing the door 1 to be opened and closed freely. During the period when the first rotating shaft 41 rotates in the second direction and drives the grounding switch 6 to open, the locking member 46 rotates in the first direction through the gear transmission mechanism until its locking portion 461 is embedded in the lock opening of the door 1, thereby constraining the door 1 and preventing it from moving.

[0038] In order to limit the rotation angle of the first rotating shaft 41, a rotation angle limiting mechanism can also be formed between the first rotating shaft 41 and the cabinet. For example, a protrusion 21 can be formed on the cabinet or on a fixed seat 2 fixed to the cabinet, and a limiter 42 can be set on the first rotating shaft 41, and the limiter 42 has a limiter groove 421 extending along the circumference of the first rotating shaft 41. The protrusion 21 can be inserted into the limiter groove 421. During the rotation of the first rotating shaft 41 in the first direction, the protrusion 21 and one of the two circumferentially opposite end walls of the limiter groove 421 form a stopper to limit the rotation angle of the first rotating shaft 41 in the first direction. Similarly, during the rotation of the first rotating shaft 41 in the second direction, the protrusion 21 and the other of the two circumferentially opposite end walls of the limiter groove 421 form a stopper to limit the rotation angle of the first rotating shaft 41 in the second direction. The two circumferential end walls of the limiter groove 421 basically define the rotation limit positions of the first rotating shaft 41 in the first direction and the second direction.

[0039] After the first rotating shaft 41 moves to the position along the first direction and the grounding switch 6 is closed, the door 1 can be opened, and the operator can approach the trolley room. For safety reasons, the first rotating shaft 41 needs to be synchronously locked to prevent it from being misoperated and causing the grounding switch 6 to be opened when the door 1 is open. For this purpose, a positioning component 47 is provided, which is linked to the opening of the door 1 to restrict the rotation of the first rotating shaft 41, and is linked to the closing of the door 1 to release the first rotating shaft 41.

[0040] In the illustrated embodiment, the movable frame 471 of the positioning assembly 47 is sleeved on the first rotating shaft 41 and can move axially along the first rotating shaft 41. The first rod 472 passes through the movable frame 471 and the fixed frame 3 and is immovable relative to the movable frame 471, for example, by a pin 473 radially penetrating the first rod 472. A second rod 476 parallel to the first rod 472 passes through the movable frame 471 and the fixed frame 3, and a biasing member 478 is sleeved on the second rod 476 and pressed between the movable frame 471 and the fixed frame 3. With the help of a pin 477 radially penetrating the first rod 472, the movable frame 471 forms an axial stop fit with the second rod 476. In cooperation with the first rod 472, a positioning member 474 is provided on the first rotating shaft 41, and the positioning member 474 is formed with a positioning groove 475.

[0041] A portion of the movable frame 471 extends toward the door 1. When the door 1 is closed, the door 1 pushes against the extended portion of the movable frame 471, pushing the movable frame 471 away from the positioning member 474, so that the first rod 472 is synchronously disengaged from the positioning groove 475 of the positioning member 474. When the door 1 is opened, the thrust on the movable frame 471 gradually decreases, and the biasing force given to the movable frame 471 by the biasing member 478 can push the movable frame 471 close to the positioning member 474, so that the first rod 472 synchronously moves toward the positioning member 474 until it is inserted into the positioning groove 475, forming a rotation constraint on the first rotating shaft 41. When the door 1 is opened, the first rod 472 is always inserted in the positioning groove 475 under the push of the biasing member 478, and the grounding switch 6 will not be closed due to misoperation of the first rotating shaft 41.

[0042] The biasing member 478 may be constructed as a compression spring sleeved on the second rod 476. In addition to being a mounting base for the biasing member 478, the second rod 476 may also be a guide member for the movement of the movable frame 471. In addition to the movable frame 471 and the first rod 472 shown in the figure, there may also be other movable locking structures that can be linked to the opening and closing action of the door 1 to limit the rotation of the first rotating shaft 41 or release the first rotating shaft 41. For example, in an embodiment not shown, the movable frame 471 and the first rod 472 may be integrated into a single movable member, one section of which is sleeved on the first rotating shaft 41 and the second rod 476, and the other section extends toward the positioning member 474, so that it can be inserted into the positioning groove 475 of the positioning member 474 and can be removed from the positioning groove 475.

[0043] The interlocking mechanism 4 can limit the movement of the trolley by an arm 49 installed on the first rotating shaft 41. The arm 49 extends from the first rotating shaft 41 at an angle, for example, it can extend perpendicular to the first rotating shaft 41. During the period when the first rotating shaft 41 rotates in the first direction and drives the grounding switch to close, the arm 49 rotates to insert the movement path of the trolley from the test position to the working position, so that the trolley cannot move to the working position. During the period when the first rotating shaft 41 rotates in the second direction and drives the grounding switch to open, the arm 49 rotates to get out of the movement path and allow the trolley to move to the working position. After the trolley reaches the working position, it blocks the arm 49 again, so that the first rotating shaft 41 cannot rotate.

[0044] The working principle of the interlocking mechanism 4 of the present utility model is described in detail below.

[0045] When the trolley room needs to be opened for maintenance, the operator moves the trolley from the working position to the test position through the operating handle from outside the distribution cabinet, thereby releasing the movement restriction of the arm 49. After that, the operator engages the first rotating shaft 41 through the operating handle from outside the distribution cabinet. At this time, because the door 1 is closed, the positioning assembly 47 does not interfere with the first rotating shaft 41, and the first rotating shaft 41 can be driven to rotate in the first direction. The rotation of the first rotating shaft 41 in the first direction causes the following actions to occur synchronously: the grounding switch 6 is closed, the positioning member 474 is rotated so that the positioning groove 475 moves to almost the axial front of the first rod 472, the arm 49 is rotated to a posture that can interfere with the movement of the trolley toward its working position, and the locking member 46 is rotated to align the avoidance portion 462 with the lock of the door 1. Thereafter, the door 1 can be opened. As the door 1 is opened, the biasing member 478 pushes the movable frame 471 together with the first rod 472 to approach the positioning member 474 until the first rod 472 is inserted into the positioning groove 475. At this point, the interlocking of the door 1 of the trolley room during opening is basically completed.

[0046] After the maintenance is completed, the door 1 is closed first. As the door 1 is closed, the movable frame 471 is pushed together with the first rod 472 away from the positioning member 474 until the first rod 472 is disengaged from the positioning groove 475, and the first rotating shaft 41 is allowed to rotate. Then the operator drives the first rotating shaft 41 to rotate in the second direction through the operating handle from outside the distribution cabinet. The rotation of the first rotating shaft 41 in the second direction causes the following actions to occur synchronously: the grounding switch 6 is opened, the positioning member 474 is rotated to move the positioning groove 475 to be offset from the first rod 472, the arm 49 is rotated to open the path for the trolley to move toward the working position, and the locking member 46 is rotated to insert the locking portion 461 into the lock of the door 1. At this time, the door 1 is constrained by the locking member 46 and cannot be opened. Then, outside the distribution cabinet, the operator drives the trolley from the test position to the working position through the operating handle.

[0047] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0048] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations made by any technician in the field without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. An interlocking mechanism for a power distribution cabinet, the power distribution cabinet comprising a grounding switch (6) and a trolley compartment, characterized in that: The interlocking mechanism comprises: A first rotating shaft (41) capable of rotating about its own central axis in a first direction to drive the grounding switch (6) to close, and rotating in a second direction opposite to the first direction to drive the grounding switch (6) to open; a locking member (46) configured to move to constrain the door (1) of the trolley chamber in a closed state in response to the first rotating shaft (41) rotating in the second direction, and to move to release the constraint on the door (1) in response to the first rotating shaft (41) rotating in the first direction; a gear transmission mechanism for transmitting power between the first rotating shaft (41) and the locking member (46); The positioning assembly (47) is configured to move to constrain the rotation of the first rotating shaft (41) in response to the door (1) being opened, and to move to release the constraint in response to the door (1) being closed.

2. The interlocking mechanism according to claim 1, characterized in that: The interlocking mechanism comprises an arm (49) extending from the first rotating shaft (41) at an angle to the central axis, and the arm (49) is configured to move to restrict the movement of the trolley in the trolley chamber from the test position to the working position when the first rotating shaft (41) rotates in a first direction, and to move to release the restriction when the first rotating shaft (41) rotates in a second direction.

3. The interlocking mechanism according to claim 2, characterized in that: The arm (49) is configured to be blocked by the trolley and limited in movement after the trolley moves to the working position.

4. The interlocking mechanism according to claim 1, characterized in that: The interlocking mechanism comprises a second rotating shaft (45) parallel to and spaced from the first rotating shaft (41), the locking member (46) being connected to the second rotating shaft (45), and the gear transmission mechanism comprising: A first gear (43) connected to the first rotating shaft (41); The second gear (44) is connected to the second rotating shaft (45) and meshes with the first gear (43).

5. The interlocking mechanism according to claim 1, characterized in that: The positioning component (47) comprises: A positioning member (474) connected to the first rotating shaft (41) and having a positioning groove (475); a movable member, configured to be driven by the door (1) moving in a closing direction to withdraw from the positioning groove (475) so as to release the constraint on the first rotating shaft (41); The biasing member (478) is configured to apply a biasing force to the movable member so as to insert the movable member into the positioning groove (475) so as to restrict the first rotating shaft (41) from rotating.

6. The interlocking mechanism according to claim 5, characterized in that: The movable parts include: A movable frame (471) connected to the first rotating shaft (41) and capable of moving along the axial direction of the first rotating shaft (41); A first rod (472) is inserted through the movable frame (471); The biasing member (478) applies a biasing force toward the positioning slot (475) to the movable frame (471) to drive the first rod (472) to be inserted into the positioning slot (475), and the movable frame (471) can be driven by the door (1) moving in a closing direction, thereby causing the first rod (472) to withdraw from the positioning slot (475).

7. The interlocking mechanism according to claim 6, characterized in that: The interlocking mechanism comprises a fixed frame (3) fixedly arranged relative to a cabinet body of the power distribution cabinet, the positioning assembly (47) comprises a second rod (476) parallel to the first rod (472) and passing through the movable frame (471) and the fixed frame (3), wherein the biasing member (478) is constructed as a compression spring sleeved on the second rod (476) and abutting against the fixed frame (3) and the movable frame (471).

8. The interlocking mechanism according to claim 7, characterized in that: The first rotating shaft (41) is disposed through the fixing frame (3).

9. The interlocking mechanism according to claim 1, characterized in that: The power distribution cabinet is provided with a fixing seat (2), the fixing seat (2) having a protrusion (21), the first rotating shaft (41) is provided with a limiting member (42), the limiting member (42) having a circumferentially extending limiting groove (421), the protrusion being embedded in the limiting groove, and when the first rotating shaft (41) rotates in two directions, the protrusion (21) respectively forms a stop fit with two circumferentially opposite end walls of the limiting groove (421).

10. A power distribution cabinet, comprising a grounding switch (6), a trolley compartment and an interlocking mechanism, characterized in that: The interlocking mechanism is the interlocking mechanism according to any one of claims 1 to 9.

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