A nested ring main unit

Abstract

This invention discloses a nested ring main unit, specifically relating to the field of ring main unit technology. It includes a cabinet and a door frame mounted on the cabinet. A sealing frame is fixed to one side of the door frame, and the door frame is provided with four sets of circular arrayed limiting components. Each set of limiting components has a sliding mechanism, and a door panel assembly is provided between the four sets of limiting components. This nested ring main unit, through the designed limiting components and sliding mechanism, allows the door panel assembly to be rotated 90 degrees to any side (up, down, left, or right) and locked. This allows for selection of the opening direction based on the spatial layout, improving the applicability and installation flexibility of the ring main unit and reducing operational inconvenience caused by space limitations. Through the cooperation of the locking component and the cross groove on the connecting block, the door panel assembly can be locked or unlocked relative to any side (up, down, left, or right). When rotating to one side, the locking components in other directions are unlocked from the cross groove.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ring main unit, and in particular to a nested ring main unit. BACKGROUND

[0002] The nested ring main unit is an electrical device in which high-voltage switching devices (such as load switches, fuses, etc.) are installed in a metal or non-metal insulated cabinet. The feature of the nested ring main unit is that the cabinet interior is designed in a nested manner, allowing the various functional modules to be closely combined, thereby improving the overall stability and adaptability of the device. The cabinet interior of the nested ring main unit is typically designed with multiple nested layers, each of which can install different functional modules, such as a switch chamber, a fuse chamber, an operating mechanism chamber, and a cable connection chamber. This design makes the device structure more compact and occupies less space.

[0003] In a narrow power distribution room, the existing ring main unit cable connection chamber cabinet door usually needs to be opened at an angle of ninety degrees or even more to conveniently access the internal cable joints and grounding wires. Moreover, the cabinet door can only be opened in a specific direction. If the cabinet is installed against a wall or side by side with other cabinets, the door may not be able to open at all or can only be placed at a specific angle. Due to the inconvenience of opening the cabinet door, it is difficult to meet the minimum bending radius during cable installation due to insufficient space, which can easily damage the insulation layer. During routine maintenance, infrared temperature measurement and regular inspection can easily form blind spots due to limited viewing angles, and wiring operations are also very inconvenient. Not only does this reduce operational efficiency, but it also poses a safety risk. SUMMARY

[0004] The present application aims to solve the problem of insufficient operating space caused by the need for a cabinet door to be opened at an angle of ninety degrees or more in a narrow power distribution room, which often restricts the door from being fully opened, making cable installation and wiring difficult and hindering maintenance and detection. To this end, a nested ring main unit is proposed.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A nested ring main unit includes a cabinet and a door frame installed on the cabinet. The door frame has a sealing frame fixed on one side. The door frame is provided with four groups of ring-shaped arrayed limiting components. Each group of limiting components is provided with a sliding mechanism. The four groups of limiting components are jointly provided with a door panel assembly.

[0007] The limiting component includes an installation plate, a locking assembly provided on the installation plate, and an installation tube fixedly connected with the locking assembly. The installation tube is provided with a plurality of ring-shaped arrayed spiral grooves. A sleeve is movably installed on the outer surface of the spiral groove. A plurality of sliding rods are fixedly arranged on the inner surface of the sleeve. A limiting tube is fixedly arranged on the sleeve.

[0008] The limiting component further comprises a fixed plate, one side of the fixed plate is fixed with a matching rod, a plurality of sliding grooves are formed in the matching rod, and a group of locking holes are formed in the matching rod;

[0009] When the door plate assembly is flipped, the sleeve is driven to slide, and through cooperation of the sliding mechanism and the locking hole, the door plate assembly can be opened and locked by 90 degrees to any side.

[0010] As a further description of the nested ring main unit of the above technology:

[0011] The sliding mechanism comprises a connecting rod connected between the spring and the mounting plate, L-shaped rods are slidingly installed at both ends of the connecting rod, and a locking rod adapted to the locking hole is fixed to the vertical part of each L-shaped rod.

[0012] As a further description of the nested ring main unit of the above technology:

[0013] The locking assembly comprises a connecting pipe rotatably installed on the mounting plate, a movable groove is formed in the outer surface of the connecting pipe, a sliding column is slidingly installed in the connecting pipe through a spring assembly, a push rod sliding in the movable groove is fixed to the outer surface of the sliding column, and a cross rod is fixed to the end of the sliding column away from the spring assembly.

[0014] As a further description of the nested ring main unit of the above technology:

[0015] The door plate assembly comprises a mounting frame, a plurality of connecting blocks are arranged on the mounting frame, and a cross groove adapted to the cross rod is formed at both ends of the connecting block.

[0016] As a further description of the nested ring main unit of the above technology:

[0017] The mounting frame is slidingly installed with a sliding plate one and a sliding plate two that are staggered with each other, two symmetrical self-locking assemblies one are arranged on the sliding plate one, and an inclined groove one adapted to the self-locking assembly one is formed in the mounting frame.

[0018] As a further description of the nested ring main unit of the above technology:

[0019] The self-locking assembly one comprises a fixed block one fixed to the sliding plate one, the fixed block one is fixed with a mounting block one on one side, the mounting block one is rotatably installed with two symmetrical movable rods one through a torsional spring, and a triangular block one adapted to the inclined groove one is fixed to the ends of the two movable rods one away from the mounting block one.

[0020] As a further description of the nested ring main unit of the above technology:

[0021] Two symmetrical self-locking assemblies two are arranged on the sliding plate two, two inclined grooves two are formed in the mounting frame and are matched with the self-locking assemblies two, and a group of inclined grooves three and an adaptive groove are formed in the sliding plate one and are matched with the self-locking assemblies two.

[0022] Further description of the nested ring network cabinet is as follows:

[0023] The self-locking assembly two comprises a fixed block two fixed on the sliding plate two, a mounting block two fixed on the fixed block two, a group of movable rods three and a movable rod two arranged on the mounting block two through a torsional spring, a triangular block two fixed on the free end of the movable rod two, and a triangular block three fixed on the free ends of the two movable rods three in the same group.

[0024] As the nested ring network cabinet is adopted, the beneficial effects of the present application are as follows:

[0025] 1. The door plate assembly can be turned by 90 degrees to any side up, down, left or right and locked through the cooperation of the limiting part and the sliding mechanism, so that the opening direction can be selected according to the space layout, the applicability and installation flexibility of the ring network cabinet are improved, and the inconvenience caused by space limitation is reduced; the door plate assembly can be locked or unlocked relative to any side up, down, left or right through the cooperation of the locking assembly and the cross groove on the connecting block, when turned to one side, the locking assembly and the cross groove in other directions are unlocked, then the connecting rod is lifted, the locking rod is moved out of the locking hole cavity, the locking assembly is rotated with the mounting pipe, the sleeve pipe is driven to move, and the spring is combined to realize the automatic insertion of the locking rod into the locking hole cavity close to the fixed plate, so that the turned door plate assembly is locked.

[0026] 2. The door plate assembly can be disassembled according to the need through the cooperation between the locking assembly and the door plate assembly, the insufficient swing space of the door plate can be solved through the detachable design, and the risk of damage to the insulation layer of the cable due to insufficient bending radius is avoided; the door plate assembly can be disassembled through the cooperation between the cross rod on the locking assembly and the cross groove on the connecting block, and the applicability of the device is improved.

[0027] 3. The door plate assembly can be partially opened according to the need, foreign matters can be reduced to enter the cable connecting chamber, and the operation efficiency is improved; the sliding plate one or the sliding plate two can be used to realize partial opening according to different operation positions, the whole door plate assembly does not need to be opened, so that dust and impurities are reduced to enter the cable connecting chamber, and the service life of the equipment is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The overall structure schematic diagram of the present application is shown;

[0029] Figure 2Part structure diagram of the present application is shown;

[0030] Figure 3 Door frame structure diagram of the present application is shown;

[0031] Figure 4 Limiting component and sliding mechanism structure diagram of the present application is shown;

[0032] Figure 5 Limiting component structure sectional view of the present application is shown;

[0033] Figure 6 Limiting component and sliding mechanism exploded view of the present application is shown;

[0034] Figure 7 Door panel assembly flip state diagram of the present application is shown;

[0035] Figure 8 Door panel assembly structure diagram of the present application is shown;

[0036] Figure 9 Magnified view at A is shown Figure 8 Magnified view at B is shown

[0037] Figure 10 Magnified view at C is shown Figure 8 Magnified view at D is shown

[0038] Figure 11 Sliding plate second upward movement state diagram of the present application is shown;

[0039] Figure 12 Sliding plate downward movement state diagram of the present application is shown.

[0040] Legend:

[0041] 10, cabinet body; 11, door frame; 12, sealing frame;

[0042] 20, limiting component; 21, mounting plate; 22, locking assembly; 221, connecting pipe; 222, movable slot; 223, spring assembly; 224, sliding column; 225, push rod; 226, cross rod; 23, mounting pipe; 24, spiral slot; 25, sleeve pipe; 251, sliding rod; 252, limiting pipe; 26, fixed plate; 27, matching rod; 28, locking hole; 29, sliding slot;

[0043] 30, sliding mechanism; 31, connecting rod; 32, L-shaped rod; 33, locking rod;

[0044] 40, door panel assembly; 41, mounting frame; 411, inclined groove two; 412, inclined groove one; 42, connecting block; 43, cross slot; 44, sliding plate one; 441, inclined groove three; 442, matching groove; 45, self-locking assembly one; 451, fixed block one; 452, mounting block one; 453, movable rod one; 454, triangular block one; 46, sliding plate two; 47, self-locking assembly two; 471, fixed block two; 472, mounting block two; 473, movable rod two; 474, triangular block two; 475, movable rod three; 476, triangular block three. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0046] As shown in Figure 1 — Figure 3 A nested ring network cabinet includes a cabinet body 10 and a door frame 11 installed on the cabinet body 10. The door frame 11 is installed at the door opening of the cable connection chamber. The door frame 11 is fixed with a sealing frame 12 on one side, and the sealing frame 12 is used for sealing. The door frame 11 is provided with four groups of annular array limiting parts 20. The left and right sides and the upper and lower sides of the door frame 11 are each installed with a group of limiting parts 20. Each group of limiting parts 20 has two limiting parts 20, and the two limiting parts 20 in the same group are symmetrical.

[0047] Each group of limiting parts 20 is provided with a sliding mechanism 30. The two limiting parts 20 in the same group are jointly provided with a sliding mechanism 30. Four groups of limiting parts 20 are jointly provided with a door panel assembly 40. The limiting parts 20 can detach the door panel assembly 40 or can lock the door panel assembly 40 after being turned by ninety degrees to any side.

[0048] As shown in Figure 4 — Figure 6 The limiting part 20 includes a mounting plate 21 fixed on the door frame 11. The mounting plate 21 is provided with a locking assembly 22 matched with the door panel assembly 40. The two locking assemblies 22 in the same group are used for locking one side of the door panel assembly 40. When unlocked, one side of the door panel assembly 40 is unlocked and in a free state. The mounting plate 21 is fixedly connected with a mounting pipe 23.

[0049] A plurality of annular array of helical grooves 24 are formed on the mounting pipe 23, two annular array of helical grooves 24 are on the mounting pipe 23, the outer surface of the helical groove 24 movably mounts a sleeve 25, the inner surface of the sleeve 25 is fixed with a plurality of sliding rods 251 matched with the helical groove 24, two sliding rods 251 on the inner surface of the sleeve 25 are respectively mounted in the inner cavities of the two helical grooves 24, and a limiting pipe 252 is fixed on the sleeve 25;

[0050] The limiting component 20 further comprises a fixed plate 26 fixed to the door frame 11, one side of the fixed plate 26 is fixed with a matching rod 27 located in the inner cavity of the mounting pipe 23, a plurality of sliding grooves 29 for the movement of the sliding rod 251 are formed on the matching rod 27, and two sliding grooves 29 correspond to the two sliding rods 251 respectively. In the process of rotating the mounting pipe 23, the two helical grooves 24 drive the sliding rod 251 to move in the inner cavity of the sliding groove 29, moving away from the locking assembly 22, a group of locking holes 28 are formed on the matching rod 27, and the group of locking holes 28 has two, one is close to the fixed plate 26, and the other is away from the fixed plate 26.

[0051] As shown in Figure 4 and Figure 5 The sliding mechanism 30 comprises a connecting rod 31 connected between the mounting plate 21 and the spring, the spring is fixedly installed on the same group of two mounting plates 21, the end of the spring away from the mounting plate 21 is fixedly connected with the connecting rod 31, and the L-shaped rod 32 is slidably installed at both ends of the connecting rod 31. The vertical part of each L-shaped rod 32 is fixed with a locking rod 33 matched with the locking hole 28, and the two locking rods 33 are respectively located in the inner cavities of the same group of two limiting pipes 252 and are inserted into the inner cavities of the locking holes 28, for locking the rotating mounting pipe 23;

[0052] When the connecting rod 31 is pushed to make the locking rod 33 move out of the inner cavity of the locking hole 28 away from the fixed plate 26, the mounting pipe 23 can be rotated at this time. In the process of rotating the mounting pipe 23 by ninety degrees, the sliding rod 251 is driven to slide in the inner cavity of the sliding groove 29, so that the sleeve 25 moves to the side close to the fixed plate 26. When the mounting pipe 23 is rotated, the connecting rod 31 is driven by the spring to make the two locking rods 33 inserted into the inner cavities of the locking holes 28 on the side close to the fixed plate 26, so as to lock the mounting pipe 23. At this time, the mounting pipe 23 has been rotated by ninety degrees.

[0053] By pushing the connecting rod 31, the locking rods 33 on both sides are moved out of the inner cavity of the two locking holes 28 far away from the fixed plate 26. Then, during the rotation of the door panel assembly 40 by 90 degrees, the mounting tube 23 rotates with the locking assembly 22, causing the sleeve 25 to slide with the locking rod 33. Under the action of the spring, the connecting rod 31 with the locking rod 33 is inserted into the inner cavity of the locking hole 28 near the fixed plate 26, locking the mounting tube 23. At the same time, the locking assembly 22 is also locked and not moved. The door panel assembly 40 rotates 90 degrees, making the door panel assembly 40 perpendicular to the door frame 11. Through the cooperation of the two limiting parts 20 in the same group on either side with the door panel assembly 40, the door panel assembly 40 can be opened 90 degrees to either side.

[0054] This allows the door panel assembly 40 to open in different directions, making it suitable for various installation spaces and different needs.

[0055] like Figure 6 As shown, the locking assembly 22 includes a connecting pipe 221 rotatably mounted on the mounting plate 21. The outer surface of the connecting pipe 221 has a movable groove 222, which is composed of a straight groove and an arc groove. The arc length of the arc groove passes through a central angle of 90 degrees. A sliding post 224 is slidably mounted inside the connecting pipe 221 via a spring assembly 223. The spring assembly 223 includes a spring fixedly connected to the sliding post 224. A washer is fixed to the end of the spring away from the sliding post 224. The washer is rotatably connected to the connecting pipe 221, so that the spring assembly 223 can rotate with the sliding post 224. A push rod 225 is fixed to the outer surface of the sliding post 224 and slides in the inner cavity of the movable groove 222. The push rod 225 is used to push the push rod 225 and make the push rod 225 slide in the inner cavity of the movable groove 222. A cross rod 226 is fixed to the end of the sliding post 224 away from the spring assembly 223.

[0056] like Figure 7 As shown, the door panel assembly 40 includes a mounting frame 41, which is in close contact with the sealing frame 12. The mounting frame 41 is provided with a plurality of connecting blocks 42. Connecting blocks 42 are fixed on the upper and lower sides and the left and right sides of the mounting frame 41. The connecting blocks 42 are located between two limiting components 20 on the same side. Both ends of the connecting blocks 42 are provided with cross grooves 43 that are adapted to the cross rods 226. The two cross rods 226 in the same group are inserted into the inner cavity of the cross grooves 43 to lock the mounting frame 41.

[0057] like Figure 7As shown, all four sets of cross rods 226 are inserted into the cross groove 43 cavity on the same side, locking the mounting frame 41. If the door panel assembly 40 is to be flipped to one side to open, the cross rods 226 on the other three sides need to be moved out of the cross groove 43 cavity. By pushing the push rod 225, the push rod 225 moves in the straight groove of the movable groove 222, causing the sliding column 224 to move the cross rods 226, so that the cross rods 226 are moved out of the cross groove 43 cavity. Then, the push rod 225 is rotated, causing the push rod 225 to move in the arc groove of the locking assembly 22, locking the push rod 225, so that the cross rods 226 are located in the cavity of the connecting tube 221.

[0058] By using the cross bar 226 and the cross groove 43, the door panel assembly 40 can be completely disassembled. When installing cables, replacing equipment, or other operations that require a large space, the entire door panel assembly 40 can be disassembled to obtain a completely open and unobstructed operating space, thus solving the problem of insufficient space for the door panel to open and swing.

[0059] When disassembling the door panel assembly 40, the locking state between the upper locking assembly 22 and the cross groove 43 can be maintained, and only the locking state of the other three sides can be released. This design can provide stable temporary fixation before the door panel assembly 40 is completely removed, effectively avoiding the danger of the door panel assembly 40 suddenly falling due to gravity.

[0060] like Figure 8 and Figure 12 As shown, sliding plates 44 and 46 are slidably mounted in the inner cavity of the mounting frame 41. The second sliding plate 46 is located on the side of the first sliding plate 44 near the cabinet 10. The first sliding plate 44 is provided with two symmetrical self-locking components 45. The self-locking components 45 are used to lock the first sliding plate 44 and keep the first sliding plate 44 stable. The mounting frame 41 is provided with a slanted groove 412 that matches the self-locking components 45. The slanted groove 412 is opened on the upper side of the mounting frame 41 and corresponds to the two self-locking components 45.

[0061] like Figure 9 As shown, the self-locking assembly 45 includes a fixing block 451 fixed to the slide plate 44. A mounting block 452 is fixed to one side of the fixing block 451. The mounting block 452 is rotatably mounted with two symmetrical movable rods 453 via a torsion spring. The movable rods 453 are connected to the mounting block 452 via the torsion spring, so that the mounting block 452 can automatically reset after rotation. The rotation center of the movable rods 453 and the center of the mounting block 452 are on the same straight line. The ends of the two movable rods 453 away from the mounting block 452 are jointly fixed with a triangular block 454 that matches the inclined groove 412. The triangular block 454 can be inserted into the inner cavity of the inclined groove 412, so that the slide plate 44 will not fall off.

[0062] like Figure 8 and Figure 11As shown, the second slide plate 46 is provided with two symmetrical self-locking components 47. The mounting frame 41 is provided with a slanted groove 411 that is adapted to the self-locking components 47. The slanted groove 411 is located on the lower side of the mounting frame 41 and corresponds to the self-locking components 47. The first slide plate 44 is provided with a set of slanted groove 441 and an adapter groove 442 that are adapted to the self-locking components 47. The slanted groove 441 is adapted to the self-locking components 47, which makes it easy to lock the second slide plate 46 when it slides upward, and can also lock the first slide plate 44 when it moves downward. The adapter groove 442 is used to prevent the first slide plate 44 from interfering with the self-locking components 47 when it moves downward.

[0063] like Figure 10 As shown, the self-locking component 2 47 includes a fixing block 2 471 fixed on the sliding plate 2 46, a mounting block 2 472 fixed on the fixing block 2 471, a set of movable rods 3 475 and a movable rod 2 473 provided on the mounting block 2 472 by means of a torsion spring, the movable rod 2 473 is rotatably mounted in the middle of the mounting block 2 472 by means of a torsion spring, the two movable rods 3 475 are respectively rotatably mounted on both sides of the mounting block 2 472 by means of a torsion spring, a triangular block 2 474 is fixed at the free end of the movable rod 2 473, and a triangular block 2 474 adapted to the inclined groove 2 411 is fixed at the end of the movable rod 2 473 away from the mounting block 2 472, the triangular block 2 474 can be inserted into the inner cavity of the inclined groove 2 411 to prevent the sliding plate 2 46 from moving;

[0064] The free ends of the two movable rods 475 in the same group are jointly fixed with triangular blocks 476. The ends of the two movable rods 475 in the same group away from the mounting block 472 are jointly fixed with triangular blocks 476 that are compatible with the inclined groove 441. When the slide plate 46 moves upward, the triangular blocks 476 will be inserted into the inner cavity of the inclined groove 441 to prevent the slide plate 46 from falling off.

[0065] The upper and lower sides of the inner cavity of the mounting frame 41 are inclined, and when it comes into contact with the inclined surfaces of triangular block 1 454, triangular block 2 474 and triangular block 3 476, it can slide relative to each other without hindering its movement.

[0066] When minor operations are required, such as operating the isolating switch, reset button, or plugging / unplugging secondary cable connectors, simply slide open the corresponding slide plate 44 or slide plate 46. This provides a more convenient method than rotating or disassembling the door panel assembly 40, while still maintaining most of the protection of the cable connection compartment. Compared to frequently opening the entire door panel assembly 40, opening only slide plate 44 or slide plate 46 minimizes the entry of dust, moisture, insects, and other foreign objects into the cable connection compartment, helping to keep the cabinet clean and dry and extend the equipment's lifespan.

[0067] Working Principle: This device is a nested ring main unit. During use, the cabinet door of the cable connection compartment can be opened according to actual needs. For comprehensive maintenance, the door panel assembly 40 can be removed or flipped open. Flipping open the door panel assembly 40 is more convenient for installation than completely removing it. During routine operation, sliding plate one 44 or sliding plate two 46 can be slid according to operational needs, thereby improving the operation and maintenance efficiency of the device.

[0068] When disassembling the door panel assembly 40, the locking state between the two locking components 22 on the upper and lower sides and the cross grooves 43 on both sides of the four connecting blocks 42 is released, and the door panel assembly 40 can be removed. By pushing the push rod 225 to slide in the inner cavity of the movable groove 222, the sliding column 224 and the cross rod 226 move accordingly, so that the cross rod 226 moves out of the inner cavity of the cross groove 43. Then, the push rod 225 is rotated to lock the push rod 225 in the arc-shaped groove of the movable groove 222, so that the cross rod 226 is located in the inner cavity of the connecting tube 221, thereby releasing the locking of the connecting block 42, which makes it easier to disassemble the door panel assembly 40.

[0069] During installation, push rod 225 is rotated from the arc-shaped groove of movable slot 222 to the straight groove of movable slot 222, and then the cross rod 226 is reset under the action of spring assembly 223, so that connecting block 42 can be installed.

[0070] Depending on the spatial layout of the installation location, the door panel assembly 40 can be flipped up, down, left, or right, while simultaneously locking the door panel assembly 40; for example... Figure 7 As shown, if the door panel assembly 40 is to be flipped upwards to open, the locking components 22 on the left, right and bottom sides and the cross groove 43 on the connecting block 42 need to be unlocked. Then, push the connecting rod 31 on the two upper limit components 20 so that the connecting rod 31 moves upwards with the locking rods 33 on both sides. Then rotate the door panel assembly 40 so that the locking components 22 rotate with the door panel assembly 40. At the same time, the locking components 22 rotate with the mounting tube 23. Driven by the spiral groove 24, the slide rod 251 moves in the inner cavity of the slide groove 29, so that the sleeve 25 moves towards the fixed plate 26. After the door panel assembly 40 is rotated 90 degrees, the connecting rod 31 moves under the action of the spring, and at the same time, the two locking rods 33 move down and insert into the inner cavity of the locking hole 28 near the fixed plate 26 to lock the mounting tube 23. At the same time, the locking components 22 are locked, so that the door panel assembly 40 is perpendicular to the door frame 11 and opens 90 degrees.

[0071] During reset, pull out the two locking rods 33 from the inner cavity of the locking hole 28, then rotate the door panel assembly 40, and then reset the locking assemblies 22 on the left, right and bottom sides. This process takes less time than disassembly and installation and is more convenient, as it does not require alignment.

[0072] During normal operation, select to activate skateboard one (44) or skateboard two (46) depending on the location, such as... Figure 12 As shown, open slide plate 44, pull out triangle block 454 from the inner cavity of inclined groove 412, causing slide plate 44 to move downwards. Triangle block 476 is inserted into the inner cavity of inclined groove 441 to prevent slide plate 44 from moving. Figure 11 As shown, open slide plate 2 46, pull out triangle block 2 474 from the inner cavity of inclined groove 2 411, so that slide plate 2 46 moves upward. Then, triangle block 3 476 is inserted into the inner cavity of inclined groove 3 441 to prevent slide plate 2 46 from falling.

[0073] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the nested ring main unit and its inventive concept, should be covered within the scope of protection of the present invention.

Claims

1. A nested ring main unit, comprising a cabinet (10) and a door frame (11) installed on the cabinet (10), and a sealing frame (12) fixed on one side of the door frame (11), characterized in that, The door frame (11) is provided with four groups of annular array limiting components (20), each group of limiting components (20) is provided with a sliding mechanism (30), and the four groups of limiting components (20) are jointly provided with a door plate assembly (40); The limiting component (20) comprises a mounting plate (21), the mounting plate (21) is provided with a locking assembly (22), and the mounting pipe (23) is fixedly connected with the locking assembly (22); a plurality of annular array spiral grooves (24) are formed in the mounting pipe (23); the outer surface of the spiral groove (24) is movably provided with a sleeve pipe (25); a plurality of sliding rods (251) are fixedly arranged on the inner surface of the sleeve pipe (25); and a limiting pipe (252) is fixed on the sleeve pipe (25). The limiting component (20) further comprises a fixed plate (26), one side of the fixed plate (26) is fixedly provided with a matching rod (27), a plurality of sliding grooves (29) are formed in the matching rod (27), and a group of locking holes (28) are formed in the matching rod (27). When the door plate assembly (40) is turned over, the sleeve pipe (25) is driven to slide, and the sliding mechanism (30) cooperates with the locking hole (28) to enable the door plate assembly (40) to be opened and locked at ninety degrees to any side.

2. The nested ring main unit according to claim 1, wherein The sliding mechanism (30) comprises a connecting rod (31) connected between the mounting plate (21) and the spring, and L-shaped rods (32) are slidably arranged at both ends of the connecting rod (31); and a locking rod (33) adapted to the locking hole (28) is fixedly arranged on the vertical portion of each L-shaped rod (32).

3. The nested ring main unit according to claim 1, characterized in that, The locking assembly (22) comprises a connecting pipe (221) rotatably arranged on the mounting plate (21), an active groove (222) is formed in the outer surface of the connecting pipe (221), a sliding column (224) is slidably arranged in the connecting pipe (221) through a spring assembly (223), a push rod (225) is slidably arranged in the inner cavity of the active groove (222) and fixedly arranged on the outer surface of the sliding column (224), and a cross rod (226) is fixedly arranged at the end of the sliding column (224) away from the spring assembly (223).

4. The nested ring main unit according to claim 3, characterized in that, The door plate assembly (40) comprises a mounting frame (41), a plurality of connecting blocks (42) are arranged on the mounting frame (41), and cross grooves (43) adapted to the cross rod (226) are formed at both ends of the connecting block (42).

5. The nested ring main unit according to claim 4, characterized in that, The mounting frame (41) is slidably provided with interlaced sliding plates one (44) and sliding plates two (46), the sliding plate one (44) is provided with two symmetrical self-locking assemblies one (45), and the mounting frame (41) is provided with inclined grooves one (412) adapted to the self-locking assemblies one (45).

6. The nested ring main unit according to claim 5, wherein The self-locking assembly one (45) comprises a fixed block one (451) fixed on the sliding plate one (44), one side of the fixed block one (451) is fixed with a mounting block one (452), the mounting block one (452) is symmetrically provided with two movable rods one (453) through torsional spring rotation, and the two movable rods one (453) are commonly fixed with a triangular block one (454) matched with the inclined groove one (412) at the ends away from the mounting block one (452).

7. The nested ring main unit according to claim 6, wherein The sliding plate two (46) is provided with two symmetric self-locking assembly twos (47), the mounting frame (41) is provided with inclined grooves two (411) matched with the self-locking assembly twos (47), and the sliding plate one (44) is provided with a group of inclined grooves three (441) and adaptive grooves (442) matched with the self-locking assembly twos (47).

8. The nested ring main unit according to claim 7, characterized in that, The self-locking assembly two (47) comprises a fixed block two (471) fixed on the sliding plate two (46), the fixed block two (471) is fixed with a mounting block two (472), the mounting block two (472) is provided with a group of movable rods three (475) and a movable rod two (473) through a torsional spring, the movable rod two (473) is fixed with a triangular block two (474) at the free end, and the two movable rods three (475) in the same group are commonly fixed with a triangular block three (476) at the free ends.

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