Interlocking device, power distribution system and drawer cabinet

Abstract

Embodiments of the present disclosure provide an interlocking device, a power distribution system and a drawer cabinet. The interlocking device comprises: a door lock assembly arranged on a drawer of the drawer cabinet, the door lock assembly comprising: a lock cylinder connected to the drawer and rotatable relative to the drawer; a lock tongue fixedly connected to the lock cylinder; and a key adapted to connect with the lock cylinder to drive the lock cylinder to rotate, so that the lock tongue rotates between a locked position and an unlocked position; and a mechanical interlocking assembly arranged in the drawer, the mechanical interlocking assembly comprising a limiting frame for limiting the rotation of the lock tongue in the locked position when the switch handle is in the closed position, and the limiting frame is also adapted to be limited by the lock tongue to prevent the switch handle from moving from the open position to the closed position when the lock tongue is in the unlocked position. In this way, interlocking between the drawers and between the drawers and the cabinet door is achieved, thereby significantly improving the safety of operation.

Description

Technical Field

[0001] The embodiments of this disclosure generally relate to the field of electrical equipment technology, and more specifically, to an interlocking device, a power distribution system, and a drawer cabinet. Background Technology

[0002] A drawer cabinet is a type of electrical distribution equipment consisting of a cabinet frame, drawers, a busbar system, and an operating mechanism. Conventional interlocking devices are used to interlock multiple devices. Each device includes the same lock cylinder and uses the same key. The user must first disconnect one device, then remove the key and insert it into another device to close it. Current interlocking devices cannot simultaneously satisfy the mechanical interlocking requirements between the drawer's opening and closing, and the switch's opening and closing. Utility Model Content

[0003] In one aspect of this disclosure, an interlocking device is provided. The interlocking device includes: a door lock assembly disposed on a drawer of a drawer cabinet, the door lock assembly including: a lock cylinder connected to the drawer and rotatable relative to the drawer; a bolt fixedly connected to the lock cylinder; and a key adapted to connect to the lock cylinder to rotate the lock cylinder, causing the bolt to rotate between a locked position and an unlocked position, wherein the bolt is in the locked position and the key is locked in the lock cylinder; and a mechanical interlocking assembly disposed within the drawer, the mechanical interlocking assembly including a limit bracket, which, when the switch handle is in the closed position, limits rotation of the bolt in the locked position, and, when the switch handle is in the open position, is further adapted to be limited by the bolt when the bolt is in the unlocked position, thereby preventing the switch handle from moving from the open position to the closed position.

[0004] According to embodiments of this disclosure, by designing a limit bracket that cooperates with the locking tongue, the key can only be removed for operation of other devices when the circuit is open and the locking tongue 12 is in the unlocked position. When the circuit is closed, the locking tongue 12 is in the locked position, and the key is locked in the lock cylinder and cannot be removed. That is, when the circuit is closed, the key cannot be used to operate other devices. Because this interlocking device (i.e., the locking and removal of the key) is mechanically interlocked with the opening and closing of the drawer switch handle, it not only achieves interlocking between drawers and between drawers and cabinet doors, but also improves operational safety. In addition, another advantage of this interlocking device is that it allows operators to directly perform the opening and closing of the switch equipment in the drawer and the locking / unlocking of the key from the outside of the drawer without opening the drawer. This not only improves the convenience of operation, but also avoids the risk of operators being directly exposed to the electric environment inside the drawer.

[0005] In some embodiments, the mechanical interlocking assembly further includes: a fixed frame connected to the drawer; a limit frame movably connected to the fixed frame; and a dial fixedly connected to the switch handle and movably connected to the limit frame, the dial being adapted to be driven by the switch handle to rotate between an open position and a closed position, thereby driving the limit frame to displacement.

[0006] In some embodiments, the limiting frame includes: a body portion including a sliding plate and a slide rail formed on the sliding plate extending along the length direction of the limiting frame, the slide rail being adapted for a dial wheel to pass through partially; and a limiting plate extending from a first end of the body portion along the height direction, the limiting plate being adapted to limit the locking tongue.

[0007] In some embodiments, the dial wheel includes a rotating portion and a first pawl and a second pawl disposed circumferentially on the rotating portion and extending outward in a radial direction, wherein the slide includes a first slide and a second slide, and during the movement of the switch handle from the open position to the closed position, the first pawl and the second pawl are adapted to be driven by the switch handle to rotate, thereby being able to insert into the first slide and the second slide and abut against the sidewalls of the first slide and the second slide to drive the limit frame to move.

[0008] In some embodiments, the limiting bracket further includes an extension disposed on the body and extending along the length direction, wherein the extension can restrict the drawer from being pulled in or out when the switch handle is in the closed position.

[0009] In some embodiments, the mounting bracket includes: a support plate connected to the drawer; a U-shaped plate including two parallel sidewalls, with a dial rotatably connected between the two sidewalls via a pin; a first upright plate arranged perpendicular to the length direction, the first upright plate having a first groove, an extension passing through the first groove; and a second upright plate spaced apart from the first upright plate in the length direction, the second upright plate being perpendicular to the length direction and including a second groove and a third groove spaced apart in the height direction, the extension passing through the second groove in the length direction, and a sliding plate passing through the third groove in the length direction.

[0010] In some embodiments, the extension further includes a support rod arranged along the length direction, and the mechanical interlocking assembly further includes a spring arranged on the support rod, with one end abutting against the first upright plate.

[0011] In some embodiments, the interlocking device further includes a locking mechanism disposed within the drawer and including a locking plate, wherein when the switch handle is in the closed position, the extension is adapted to restrict movement of the locking plate.

[0012] In a second aspect of this disclosure, a power distribution system is provided. The power distribution system includes: a drawer cabinet and a distribution box; a drawer arranged in the drawer cabinet, the drawer being adapted to accommodate switching equipment; and two interlocking devices according to a first aspect of this disclosure, respectively connected to the doors of the drawer and the distribution box, to interlock the doors of the drawer and the distribution box while the switching equipment in the drawer is in the closed position.

[0013] In a third aspect of this disclosure, a drawer cabinet is provided. The drawer cabinet includes: a cabinet body; a plurality of drawers, each disposed on the cabinet body; and a plurality of interlocking devices according to a first aspect of this disclosure, each connected to each of the plurality of drawers, the plurality of drawers sharing a single key, such that when a switch in one of the plurality of drawers is in the open position to release the key, the key can be used to operate door lock assemblies on the other drawers to allow associated control of the switch in the other drawers.

[0014] It should be understood that the description in this section is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0015] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein: Figure 1 A schematic diagram of the interlocking device in the open position according to some embodiments of the present disclosure is shown; Figure 2 A schematic diagram of the interlocking device in the closed position according to some embodiments of the present disclosure is shown; Figure 3 A front view of the interlocking device according to some embodiments of the present disclosure in the open position is shown; Figure 4 A front view of the interlocking device according to some embodiments of the present disclosure in the closed position is shown; and Figure 5 A dimensional diagram of a door lock assembly according to some embodiments of the present disclosure is shown.

[0016] Explanation of reference numerals in the attached figures: 1 is the door lock assembly, 2 is the mechanical interlock assembly, 11 is the lock cylinder, 12 is the lock tongue, 21 is the limit bracket, 22 is the fixing bracket, 23 is the dial wheel, 211 is the main body, 212 is the limit plate, 213 is the extension, 214 is the support rod, 215 is the first slide rail, 216 is the second slide rail, 217 is the sliding plate, 221 is the support plate, 222 is the U-shaped plate, 223 is the first upright plate, 224 is the first groove, 225 is the second upright plate, 226 is the third groove, 227 is the third upright plate, 228 is the fourth groove, 231 is the first pawl, and 232 is the second pawl. Detailed Implementation

[0017] Embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0018] The term “comprising” and its variations, as used herein, indicate an open-ended inclusion, meaning “including but not limited to”. Unless otherwise stated, the term “or” means “and / or”. The terms “first,” “second,” etc., may refer to different or the same objects.

[0019] As described above, conventional interlocking devices are used to interlock multiple devices. Each device includes the same lock cylinder and uses the same key. The user must first disconnect one device, then remove the key and insert it into another device to close it. This type of interlocking device can only achieve interlocking between multiple devices, and cannot achieve interlocking between drawers and cabinet doors, or between drawers themselves.

[0020] Embodiments of this disclosure provide an interlocking device, a power distribution system, and a drawer cabinet to at least partially solve the above-mentioned problems. See below for further details. Figures 1 to 4 An interlocking device according to an embodiment of the present disclosure will be described.

[0021] Figure 1 A schematic diagram of the interlocking device in the open position according to some embodiments of the present disclosure is shown; Figure 2 A schematic diagram of the interlocking device in the closed position according to some embodiments of the present disclosure is shown; Figure 3 A front view of the interlocking device according to some embodiments of the present disclosure in the open position is shown; Figure 4A front view of an interlocking device according to some embodiments of the present disclosure in the closed position is shown. The interlocking device described herein generally includes a door lock assembly 1 and a mechanical interlock assembly 2. The door lock assembly 1 is disposed on a drawer of a drawer cabinet. The drawer cabinet generally includes a cabinet frame and at least one drawer connected to the interior of the cabinet frame. In some embodiments, multiple drawers may be arranged within the cabinet frame along the height direction of the drawer cabinet. At least one drawer is used to accommodate a switching device.

[0022] The door lock assembly 1 includes a lock cylinder 11, a bolt 12, and a key. The lock cylinder 11 is connected to a drawer. The lock cylinder 11 can rotate relative to the drawer when driven by the key. The bolt 12 is fixedly connected to the lock cylinder 11 and rotates with the lock cylinder. The key can be inserted into or removed from the lock cylinder 11. When the key is inserted into the lock cylinder 11, it rotates the lock cylinder, causing the lock cylinder 11 to rotate the bolt 12 between a locked position and an unlocked position. When the bolt 12 is in the locked position, the key is locked in the lock cylinder 11. The key can only be removed from the lock cylinder 11 when the bolt 12 is rotated to the unlocked position.

[0023] Mechanical interlock assembly 2 is arranged inside the drawer and connected to the switching device inside the drawer, thereby allowing the switching device to be operated from the outside of the drawer via the drawer's switch handle. Mechanical interlock assembly 2 includes a limit bracket 21. When the drawer's switch handle is turned from the open position to the closed position, that is, when the switching device is switched from the open position to the closed position, the limit bracket 21 can be displaced under the drive of the switch handle. When the switch handle is in the closed position, the limit bracket 21 restricts the rotation of the locking tongue 12, which is in the locked position. When the switch handle is in the open position, with the locking tongue 12 in the unlocked position, the limit bracket 21 can be limited by the locking tongue 12, i.e., the locking tongue 12 limits the limit bracket 21, thereby preventing the switch handle from moving from the open position to the closed position.

[0024] refer to Figure 1 and Figure 3 At this time, the switch handle is in the open position, the latch 12 is in the unlocked position, and the key is not inserted into the lock cylinder 11. Because the latch 12 limits the limit bracket 21, the limit bracket 21 cannot move, and the switch handle cannot close the circuit. At this time, insert the key into the lock cylinder 11 and rotate the latch 12 counterclockwise by 90 degrees. The latch 12 is then released from the limit bracket 21, and the switch handle can be rotated to close the circuit.

[0025] refer to Figure 2 and Figure 4At this time, the switch handle is in the closed position, the latch 12 is in the locked position, and the key inserted into the lock cylinder 11 cannot be removed. That is to say, in the closed position, the key cannot be removed to open the lock on other devices (such as another drawer or cabinet door). At this time, due to the obstruction of the limit bracket 21, the latch 12 cannot rotate, that is, the latch 12 cannot move from the locked position to the unlocked position.

[0026] In this way, by designing the limit bracket 21 to cooperate with the locking tongue 12, the key can only be removed for operation of other devices when the circuit is open and the locking tongue 12 is in the unlocked position. When the switch in the drawer is in the closed position, the locking tongue 12 is in the locked position, and the key is locked in the lock cylinder and cannot be removed. That is, when the switch in the drawer is in the closed position, the key cannot be used to operate other devices downstream of the circuit. Because this interlocking device (i.e., the locking and removal of the key) and the opening and closing of the drawer switch handle are mechanically interlocked, it not only achieves interlocking between drawers and between drawers and cabinet doors, but also improves operational safety. Importantly, the entire interlocking process is achieved entirely through the rigid cooperation of mechanical components and does not rely on electrical components. Therefore, the interlocking relationship is reliable and will not fail due to electrical faults or electromagnetic interference.

[0027] In some embodiments, the mechanical interlocking assembly 2 may further include a mounting bracket 22 and a dial 23. The mounting bracket 22 is connected to the drawer. The mounting bracket 22 is a support and fixing structure for the mechanical interlocking assembly 2. A limiting bracket 21 is movably connected to the mounting bracket 22, and the limiting bracket 21 can move relative to the mounting bracket 22 toward or away from the latch 12, i.e., along the length direction.

[0028] The dial 23 is fixedly connected to the drawer's switch handle. The switch handle can drive the dial 23, causing it to rotate between the open and closed positions, thereby driving the limit bracket 21 to move. In this way, by rotating the switch handle to drive the dial 23, the limit bracket 21 is translated relative to the fixed bracket 22, thus limiting the locking tongue 12.

[0029] In some embodiments, the dial 23 may include a rotating portion, a first pawl 231, and a second pawl 232. The first pawl 231 and the second pawl 232 are respectively disposed circumferentially on the rotating portion and extend outward in the radial direction. The first pawl 231 and the second pawl 232 will cooperate with the slide rail of the limiting frame 21 mentioned later to drive the limiting frame 21 to move. In some embodiments, the rotating portion may include a shaft hole, so that a pin passes through the shaft hole and connects the rotating portion to the fixed frame 22.

[0030] In some embodiments, the limiting frame 21 may include a body portion 211 and a limiting plate 212. The body portion 211 may include a sliding plate 217 and a slide rail. A slide rail extending along the length direction of the limiting frame 21 is formed on the sliding plate 217. The dial wheel 23 can pass through the slide rail to drive the limiting frame 21 to move. In some embodiments, the slide rail may include a first slide rail 215 and a second slide rail 216. The first slide rail 215 and the second slide rail 216 are arranged along the length direction. During the movement of the switch handle from the open position to the closed position, the switch handle drives the first pawl 231 and the second pawl 232 to rotate, thereby allowing the first pawl 231 and the second pawl 232 to be inserted into the first slide rail 215 and the second slide rail 216, respectively. The first pawl 231 and the second pawl 232 respectively abut against the sidewalls of the first slide rail 215 and the second slide rail 216 to push the limiting frame 21 to move. Specifically, when closing the circuit, the switch handle is rotated, causing the first pawl 231 to move within the first slide rail 215 until it abuts against the inner wall of the first slide rail 215, thereby moving the limit bracket 21 towards the locking tongue 12. When opening the circuit, the switch handle is rotated in the opposite direction, causing the second pawl 232 to move within the second slide rail 216 until it abuts against the inner wall of the second slide rail 216, thereby moving the limit bracket 21 away from the locking tongue 12.

[0031] The limiting plate 212 extends from the first end of the main body 211 along a height direction perpendicular to the length direction. That is, the limiting plate 212 protrudes from the surface of the main body 211 and is arranged perpendicular to the main body 211. The limiting plate 212 is used to limit the locking tongue 12. In this way, by limiting the locking tongue 12 with the limiting plate 212, the locking tongue 12 cannot be unlocked in the closed position, and in the open position, the switch handle cannot move from the open position to the closed position, thus improving the safety of equipment operation.

[0032] In some embodiments, the limiting bracket 21 may further include an extension 213. The extension 213 is disposed on the body portion 211 and extends along its length. In some embodiments, the extension 213 may be parallel to the sliding plate 17. When the switch handle is in the closed position, the extension 213 can restrict the drawer from being pulled in or out. In this way, the limiting bracket 21 can not only cooperate with other devices for locking, but also cooperate with the drawer's locking mechanism to achieve re-locking.

[0033] In some embodiments, the mounting bracket 22 may include a support plate 221, a U-shaped plate 222, a first upright plate 223, and a second upright plate 225. The support plate 221 may be connected to a drawer. In some embodiments, the support plate 221 may be generally L-shaped, and a connecting hole is arranged on the bottom edge of the L-shape to fix the mounting bracket 22 inside the drawer. The U-shaped plate 222 may include two parallel sidewalls, thereby connecting the dial 23 between the two sidewalls via a pin. In some embodiments, the U-shaped plate 222 may be formed at one end of the support plate 221 in the height direction. The first upright plate 223 is arranged perpendicular to the length direction. The first upright plate 223 may have a first groove 224. An extension 213 extends from the first upright plate 223 after passing through the first groove 224.

[0034] The second upright plate 225 is spaced apart from the first upright plate 223 along its length. The second upright plate 225 may be perpendicular to the length direction and includes a second groove and a third groove 226 spaced apart along the height direction. The second groove and the first groove 224 are arranged opposite each other along the length direction, such that the extension 213 can pass through the first groove 224 and the second groove along the length direction. The sliding plate 217 passes through the third groove 226 along the length direction. In this way, the fixing frame 22 supports the limiting frame 21 through the first upright plate 223 and the second upright plate 225, reducing the swaying of the limiting frame 21 and improving the stability of the movement of the limiting frame 21.

[0035] In some embodiments, the extension 213 further includes a support rod 214 arranged along its length. The mechanical interlock assembly 2 may also include a spring. The spring is arranged on the support rod 214, and one end of the spring abuts against the first upright plate 223. In this way, the first upright plate 223 not only improves the support strength of the entire limit frame 21, but also limits the spring on the extension 213, so that the spring can reset the limit frame 21 during the opening process.

[0036] In some embodiments, the interlocking device may further include a third upright plate 227 and a locking mechanism. The third upright plate 227 has a fourth groove 228 extending in the width direction. In some embodiments, the third upright plate 227 may be fixed to a drawer. In other embodiments, the third upright plate 227 may also be fixed to a mounting bracket 22. An extension 213 may extend from the third upright plate 227 after passing through the fourth groove 228. In this way, the extension 213 can be further supported by the third upright plate 227.

[0037] The locking mechanism can be located inside the drawer. The locking mechanism includes a locking plate. During the rotation of the switch handle from the open position to the closed position, the extension 213 extends from the fourth recess 228 after being driven, thereby limiting the locking plate and restricting its movement. In this way, when in the closed position, the extension 213 limits the locking mechanism, preventing the locking mechanism (e.g., the unlock button) from unlocking, thus preventing the drawer from being removed from the drawer cabinet. This design constitutes a double mechanical interlock: both the key is locked via the door lock assembly 1 and the physical position of the drawer is locked via the extension 213. This double locking mechanism enhances system security and effectively prevents the dangerous situation of accidentally pulling out the drawer while it is energized. Simultaneously, since both the switch handle and the door lock are located outside the drawer, the operator can complete all operations without opening the drawer, further improving operational convenience and safety.

[0038] Specifically, the drawer locking mechanism mentioned above is a component that physically locks the drawer to the cabinet. In some embodiments, the locking mechanism may include an unlock button, a locking pin, and a slider mechanism. The unlock button is located on the drawer panel and can be pressed by the user to unlock the drawer. The locking pin, in the locked state, engages with a slot or fixed part on the cabinet frame to prevent the drawer from being accidentally pulled out. The slider mechanism moves in response to the pressing of the unlock button to drive the locking pin from its locked state to its unlocked state. For example, the slider mechanism may include a ramp structure that, when the unlock button is pushed, converts the horizontal movement of the button into a vertical lifting movement of the locking pin, thereby disengaging the locking pin from the slot in the cabinet.

[0039] In the embodiments of this disclosure, the locking plate mentioned above is part of the slider mechanism or a part directly linked to the unlock button. Its working principle is as follows: When the switch handle is in the closed position, the end of the extension 213 of the mechanical interlock assembly 2 moves behind the movement path of the slider mechanism or the unlock button, forming a physical block. Therefore, even if the user attempts to press the unlock button, the button cannot be pressed due to the blockage of the extension 213, and the locking pin cannot be lifted, thus reliably preventing the drawer from being pulled out while energized (closed). When the switch handle is in the open position, the extension 213 retracts to a position where it does not block the locking plate, releasing the obstruction to the locking mechanism. At this time, the user can smoothly press the unlock button, and the slider mechanism drives the locking pin to unlock, allowing the drawer to be normally pulled out of the cabinet.

[0040] In some embodiments, the power distribution system may include drawer cabinets and distribution boxes, drawers, and interlocking devices. In such applications, the switchgear in the drawer cabinet can serve as the upstream switchgear for the electrical equipment in the distribution box. This interlocking device ensures that the user can only obtain the key and open the distribution box door when the upstream switchgear is in the open position, thus guaranteeing that subsequent operation of the electrical equipment in the distribution box is performed in a de-energized state. The drawer is arranged in the drawer cabinet and can slide relative to it. The interlocking device is connected to both the drawer and the distribution box door, interlocking the drawer and the distribution box door while the switchgear in the drawer is closed. In some embodiments, if maintenance of the distribution box is required, the switchgear in the drawer needs to be opened. At this time, the latch 12 is in the unlocked position, allowing the key to be removed from the lock cylinder 11. Only the removed key can open the distribution box door for maintenance. If the maintenance of the distribution box is not completed and the key is not removed from the distribution box but inserted in the lock cylinder 11, the switchgear in the drawer cannot be closed. In this way, the distribution box can function without a main switch for the incoming line, instead using the switch in the drawer as the main switch for the incoming line.

[0041] In some embodiments, the drawer cabinet includes a cabinet body, multiple drawers, and multiple interlocking devices. Multiple drawers are respectively arranged on the cabinet body. Multiple interlocking devices are respectively connected to each of the multiple drawers, and the multiple drawers share a single key, such that when the switch in one of the multiple drawers is in the open position to release the key, the key can be used to operate the door lock assembly 1 on the other drawers, thereby allowing associated control of the switches in the other drawers. In some embodiments, for example, when the drawer cabinet includes two drawers, when the switch in one drawer is open, the latch 12 is in the unlocked position, allowing the key to be removed from the lock cylinder 11, thereby using the removed key to operate the switch in the other drawer, closing the switch in the other drawer. In some embodiments, the two drawers can be powered by a main power supply and a backup power supply, respectively.

[0042] In some embodiments, the door lock assembly 1 may be selected in a suitable size so that the latch 12 can cooperate with the limit bracket. Figure 5 A top view of the door lock assembly 1 is shown. In some embodiments, the distance L1 from the end of the latch 12 to the axis of the lock cylinder 11 in the length direction can be 30±0.25mm, the distance D1 from the vertex of the surface of the latch 12 to one end of the lock cylinder 11 in the width direction can be 38±0.25mm, and the diameter L2 of one end of the lock cylinder 11 can be 28mm. It should be understood that the above specific dimensions are only examples of a preferred embodiment of this disclosure. These values ​​are not intended to limit the scope of this disclosure in any way, and those skilled in the art can modify and adjust them according to actual design needs and application scenarios.

[0043] It should be noted that the figures, values, etc., mentioned above and elsewhere in this disclosure are exemplary and are not intended to limit the scope of this disclosure in any way. Any other suitable figures or values ​​are possible.

[0044] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. An interlocking device, characterized in that, include: A door lock assembly (1) is disposed on a drawer of a drawer cabinet, the door lock assembly (1) comprising: A lock cylinder (11) is connected to the drawer and is rotatable relative to the drawer; The bolt (12) is fixedly connected to the lock cylinder (11); and A key, adapted to connect to the lock cylinder (11) to rotate the lock cylinder (11), causing the bolt (12) to rotate between a locked position and an unlocked position, wherein the bolt (12) is in the locked position and the key is locked in the lock cylinder (11); and A mechanical interlock assembly (2) is arranged inside the drawer. The mechanical interlock assembly (2) includes a limit frame (21). When the switch handle is in the closed position, the limit frame (21) is used to restrict the rotation of the latch (12) in the locked position. When the switch handle is in the open position, the limit frame (21) is also adapted to be limited by the latch (12) when the latch (12) is in the unlocked position, thereby preventing the switch handle from moving from the open position to the closed position.

2. The interlocking device according to claim 1, characterized in that, The mechanical interlocking assembly (2) also includes: The fixing bracket (22) is connected to the drawer, and the limiting bracket (21) is movably connected to the fixing bracket (22); and A dial (23) is fixedly connected to the switch handle and movably connected to the limit frame (21). The dial (23) is adapted to be driven by the switch handle to rotate between the open and closed positions, thereby driving the limit frame (21) to displacement.

3. The interlocking device according to claim 2, characterized in that, The limiting frame (21) includes: The body (211) includes a sliding plate (217) and a slide rail formed on the sliding plate (217) extending along the length direction of the limiting frame (21), the slide rail being adapted to allow the dial wheel (23) to pass through partially; and A limiting plate (212) extends from the first end of the body part (211) along the height direction, and the limiting plate (212) is adapted to limit the locking tongue (12).

4. The interlocking device according to claim 3, characterized in that, The dial (23) includes a rotating part and a first pawl (231) and a second pawl (232) disposed on the rotating part and extending outward in the radial direction. The slide rails include a first slide rail (215) and a second slide rail (216). During the movement of the switch handle from the open position to the closed position, the first pawl (231) and the second pawl (232) are adapted to be driven by the switch handle to rotate, thereby inserting into the first slide rail (215) and the second slide rail (216) and pushing against the sidewalls of the first slide rail (215) and the second slide rail (216) to drive the limit frame (21) to move.

5. The interlocking device according to claim 3, characterized in that, The limiting bracket (21) further includes an extension (213) disposed on the main body (211) and extending along the length direction. When the switch handle is in the closed position, the extension (213) can restrict the drawer from being pulled in or out.

6. The interlocking device according to claim 5, characterized in that, The fixing frame (22) includes: Support plate (221) is connected to the drawer; The U-shaped plate (222) includes two parallel sidewalls, and the dial (23) is rotatably connected between the two sidewalls via a pin; and A first upright plate (223) is arranged perpendicular to the length direction, and the first upright plate (223) has a first groove (224), through which the extension (213) passes; and The second upright plate (225) is arranged at intervals relative to the first upright plate (223) in the length direction. The second upright plate (225) is perpendicular to the length direction and includes a second groove and a third groove (226) arranged at intervals along the height direction. The extension (213) passes through the second groove in the length direction, and the sliding plate (217) passes through the third groove (226) in the length direction.

7. The interlocking device according to claim 6, characterized in that, The extension (213) also includes a support rod (214) arranged along the length direction, and the mechanical interlock assembly (2) also includes a spring arranged on the support rod (214) with one end abutting against the first upright plate (223).

8. The interlocking device according to any one of claims 5-7, characterized in that, The interlocking device further includes: A locking mechanism is arranged inside the drawer and includes a locking plate, wherein when the switch handle is in the closed position, the extension (213) is adapted to restrict the movement of the locking plate.

9. A power distribution system, characterized in that, include: drawer cabinets and electrical control boxes; Drawers, arranged in the drawer cabinet, are adapted to accommodate switching devices; as well as Two interlocking devices according to any one of claims 1-8 are respectively connected to the drawer and the door of the distribution box to interlock the drawer and the door of the distribution box while the switching device in the drawer is in the closed position.

10. A drawer cabinet, characterized in that, include: Cabinet; Multiple drawers are arranged on the cabinet body; as well as A plurality of interlocking devices according to any one of claims 1-8 are respectively connected to each of the plurality of drawers, the plurality of drawers sharing a key, such that when a switch device in one of the plurality of drawers is in the open position to release the key, the key can be used to operate the door lock assemblies on the remaining drawers of the plurality of drawers to allow associated control of the switch devices in the remaining drawers.

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