Intelligent screen installation structure of electric power automation control cabinet

Abstract

The utility model relates to the technical field of intelligent screen installation, and discloses an electric power automation control cabinet intelligent screen installation structure, which comprises an intelligent screen assembly and an installation frame, the intelligent screen assembly comprises a screen body and a screen integrated board, the screen integrated board is fixedly arranged behind the screen body, and a power supply port is electrically connected below the rear part of the screen integrated board. Insertion columns are fixedly arranged at the corner ends of the rear portion of the screen integrated board, and positioning grooves are formed in the inner sides of the insertion columns. The mounting frame comprises a bottom plate and supporting plates, a limiting groove is formed in the front of the bottom plate, the middle of the bottom plate is of a cavity structure, an inner groove frame is fixedly arranged behind the bottom plate, first inserting grooves are formed in the corner ends of the inner groove frame, the first inserting grooves and the inserting columns are of corresponding structures, a limiting frame is fixedly arranged behind the first inserting grooves, and the supporting plates are welded to the upper end and the lower end of the rear portion of the bottom plate. The intelligent screen assembly can be directly and stably placed and installed in the front of the installation frame, so that the intelligent screen assembly is fastened and locked, is prevented from being easily loosened and is directly suitable for being installed on equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent screen installation, in particular to an intelligent screen installation structure for a power automation control cabinet. Background Technique

[0002] A power automation control cabinet is a control cabinet for equipment in various power generation, distribution, and substation. It can assemble switchgear, measuring instruments, protective electrical appliances, and auxiliary equipment in a closed or semi-closed metal cabinet or on a screen according to the requirements of electrical wiring. Its layout should meet the requirements of the normal operation of the power system, be convenient for maintenance, and not endanger the safety of personnel and surrounding equipment. With the rapid development of technology and the improvement of the quality of human life, it is necessary for equipment and people to have better interaction to achieve a better experience and more convenient operation. An intelligent screen integrates advanced technologies such as touch screens, display screens, and industrial control computers. The product has rich open interfaces to connect with external devices, and realizes functional requirements through the intelligent screen system software, or realizes specific scenarios and special functional requirements through secondary development of the software. Currently, usually, a supplier produces an intelligent screen integrated component, which is an integrated structure of core functional components such as a touch screen, a liquid crystal display screen, and an industrial control main board, and then provides the intelligent screen integrated component to the end customer for installation on the equipment shell.

[0003] After retrieval, the patent with the Chinese patent authorization number CN215601638U discloses an intelligent screen installation structure for a power automation control cabinet, which relates to the technical field of intelligent screens, including an intelligent screen integrated component, an equipment shell, and a fixing bracket. An installation opening is provided on the front side wall surface of the equipment shell, and the intelligent screen integrated component is embedded in the installation opening. The fixing bracket is located inside the equipment shell and is fixedly connected to the inner wall of the equipment shell. A stud is connected to the back side of the intelligent screen integrated component, and the fixing bracket and the stud are fixedly connected by screws.

[0004] The following deficiencies exist in the intelligent screen installation structure for a power automation control cabinet in the above patent: It is difficult to manually adjust and lock the intelligent screen integrated component after it is placed inside the equipment shell, which is likely to cause looseness, the overall strength is low, and the overall equipment shell is not convenient for wide-range installation. Therefore, corresponding technical solutions need to be designed to solve this problem. Content of the Utility Model

[0005] (1) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the utility model provides an intelligent screen installation structure for a power automation control cabinet, which solves the technical problems that it is difficult to manually adjust and lock the intelligent screen integrated component after it is placed inside the equipment shell, which is likely to cause looseness, the overall strength is low, and the overall equipment shell is not convenient for wide-range installation.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the utility model is realized through the following technical solutions: a smart screen installation structure for a power automation control cabinet, including a smart screen component and a mounting rack. The smart screen component includes a screen body and a screen integrated board. The screen integrated board is fixedly arranged behind the screen body. A power port is electrically connected to the lower part of the rear of the screen integrated board. Plug posts are fixedly arranged at the rear corner ends of the screen integrated board, and positioning grooves are formed inside the plug posts.

[0009] The mounting rack includes a bottom plate and a support plate. A limiting groove is formed in the front of the bottom plate. The middle part of the bottom plate is of a cavity structure, and an inner groove frame is fixedly arranged at the rear. Slots I are formed at the corner ends of the inner groove frame. The slots I and the plug posts are corresponding structures. A limiting frame is fixedly arranged behind the slots I. The support plates are welded to the upper and lower ends of the rear of the bottom plate. The support plates are of an L-shaped structure, and the two ends of the support plates are connected through threads by support plate bolts.

[0010] Preferably, a power supply slot is formed below the inner groove frame. The power supply slot and the power port are corresponding structures. Heat dissipation holes are formed and distributed in the middle of the inner groove frame; the provided power supply slot is used for corresponding placement with the power port to facilitate the use of the output power supply line for power supply, and the heat dissipation holes are used for efficient heat dissipation of the screen integrated board.

[0011] Preferably, a slot II is formed at the inner end of the limiting frame. Locking bolts are connected through threads and distributed at the outer end of the limiting frame; the provided limiting frame is used for inserting the plug post, the slot II is used for inserting the positioning post, and the locking bolts are used for locking the plug post, so that the smart screen component is firmly fixed after being installed inside the mounting rack.

[0012] Preferably, a locking adjustment device is arranged between the limiting frames. A partition is fixedly arranged in the middle of the locking adjustment device. Positioning posts are slidably connected above and below the locking adjustment device. Chutes are formed at the upper and lower ends of the rear of the locking adjustment device. A slider is fixedly arranged behind the positioning post. The slider is embedded inside the chute. A limiting plate is fixedly arranged behind the slider. The limiting plate is located behind the locking adjustment device. The width of the limiting plate is greater than the width of the slider. A push plate is fixedly arranged behind the limiting plate. Spring rods are welded between the outer side of the slider and the inner side wall of the chute; the provided positioning posts are used for sliding adjustment and positioning insertion inside the slot II. The chutes are used for limiting the slider and the limiting plate to make the adjustment more stable. The push plate is used for hand-held pushing operation, and the spring rods are used for elastically controlling the positioning posts to slide and position inside the slot II.

[0013] Preferably, a nut is fixedly provided at the front end of the support plate bolt, and an internal hexagonal groove is formed in front of the nut; the nut with the internal hexagonal groove is convenient for directly inserting a tool to rotate and operate, and the disassembly and assembly structure is simple.

[0014] Preferably, operation grooves corresponding to the support plate bolts are formed at the corner ends of the bottom plate, a metal groove is formed in front of the operation groove, a rotation groove is formed above or below the metal groove, a rotating shaft rod is fixedly arranged inside the rotation groove, a connecting plate is rotatably connected to the middle of the rotating shaft rod, a cover plate is fixedly arranged at the outer end of the connecting plate, a pull ring is fixedly arranged on the outer side wall of the cover plate, and the cover plate is of a magnetic attraction type structure; the operation groove is convenient for inserting and removing the support plate bolt for equipment installation, the rotation groove is used for embedding and fixing the rotating shaft rod, the rotating shaft rod is used for supporting the rotation of the connecting plate, and the magnetic attraction type cover plate is used for adsorbing and fixing inside the metal groove, and the opening and closing operation is simple.

[0015] (III) Beneficial effects

[0016] (1) For the intelligent screen installation structure of the power automation control cabinet, through the screen integration board arranged at the rear of the screen body, the limit groove formed in front of the bottom plate, and the inner groove frame fixedly arranged at the rear of the middle part, it is convenient to directly and stably place and install the intelligent screen assembly inside the front of the installation frame. The structure is simple. Through the insertion posts fixed at the rear corner ends of the screen integration board, the slot one formed at the corner ends of the inner groove frame, and the limit frame fixed at the rear, the intelligent screen assembly is more firmly locked after being installed inside the installation frame, with high strength and avoiding easy loosening. And through the support plates welded at the upper and lower ends of the rear of the bottom plate, it is convenient to directly position and install above the equipment, with low cost, convenient operation and wide application range.

[0017] (2) For the intelligent screen installation structure of the power automation control cabinet, the power supply slot is provided for corresponding placement with the power supply port, which is convenient for outputting power supply lines for power supply use. The heat dissipation holes are used for high-efficiency heat dissipation of the screen integration board. The limit frame is used for inserting the insertion posts, the slot two is used for inserting the positioning posts, the locking bolts are used for locking the insertion posts, so that the intelligent screen assembly is firmly and reliably installed inside the installation frame. The positioning posts are used for sliding and adjusting to position and insert into the slot two. The chute is used for limiting the slider and the limit plate, making the adjustment more stable. The push plate is used for holding and pushing operation. The spring rod is used for elastically controlling the sliding of the positioning posts to be positioned inside the slot two. The nut with the internal hexagonal groove is convenient for directly inserting a tool to rotate and operate, and the disassembly and assembly structure is simple. The operation groove is convenient for inserting and removing the support plate bolt for equipment installation, the rotation groove is used for embedding and fixing the rotating shaft rod, the rotating shaft rod is used for supporting the rotation of the connecting plate, and the magnetic attraction type cover plate is used for adsorbing and fixing inside the metal groove, and the opening and closing operation is simple. Description of the drawings

[0018] Figure 1 It is a front three-dimensional structure schematic diagram of the whole of the present utility model;

[0019] Figure 2 This is a schematic diagram of the overall rear three-dimensional structure of the present utility model;

[0020] Figure 3 This is a schematic diagram of the inner three-dimensional structure of the intelligent screen of the present utility model;

[0021] Figure 4 This is a schematic diagram of the side structure of the mounting bracket of the present utility model;

[0022] Figure 5 This is a schematic diagram of the outer perspective structure of the cover plate of the present utility model;

[0023] Figure 6 This is a schematic diagram of the inner perspective structure of the cover plate of the present utility model;

[0024] Figure 7 This is a schematic diagram of the locking structure after installation of the present utility model;

[0025] Figure 8 This is a schematic diagram of the support plate bolt structure of the present utility model.

[0026] In the figure, 10, intelligent screen assembly; 11, screen body; 12, screen integrated board; 13, plug post; 131, positioning groove; 14, power port; 20, mounting bracket; 21, bottom plate; 22, limiting groove; 23, inner groove frame; 231, power supply groove; 232, heat dissipation hole; 24, support plate; 241, support plate bolt; 242, nut; 243, hexagon socket; 25, operation groove; 251, cover plate; 252, pull ring; 253, metal groove; 254, rotation groove; 255, rotating shaft rod; 256, connecting plate; 26, slot one; 261, limiting frame; 262, slot two; 263, locking bolt; 27, locking adjustment device; 271, positioning post; 272, partition; 273, sliding groove; 274, slider; 275, limiting plate; 276, push plate; 277, spring rod. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0028] Please refer to Figures 1 - 8, an embodiment of the present utility model provides a technical solution: a smart screen installation structure for a power automation control cabinet, including a smart screen assembly 10 and a mounting rack 20. The smart screen assembly 10 includes a screen body 11 and a screen integrated board 12. The screen integrated board 12 is fixedly arranged behind the screen body 11. A power port 14 is electrically connected to the lower part of the rear of the screen integrated board 12. Plug posts 13 are fixedly arranged at the rear corner ends of the screen integrated board 12, and positioning grooves 131 are formed inside the plug posts 13;

[0029] The mounting rack 20 includes a bottom plate 21 and support plates 24. A limiting groove 22 is formed in the front of the bottom plate 21. The middle of the bottom plate 21 has a cavity structure and an inner groove frame 23 is fixedly arranged at the rear. Slots one 26 are formed at the corner ends of the inner groove frame 23. The slots one 26 and the plug posts 13 are corresponding structures. A limiting frame 261 is fixedly arranged behind the slots one 26. The support plates 24 are welded to the upper and lower ends of the rear of the bottom plate 21. The support plates 24 are in an L-shaped structure, and support plate bolts 241 are connected through threads at both ends of the support plates 24.

[0030] By arranging the screen integrated board 12 behind the screen body 11, the limiting groove 22 formed in the front of the bottom plate 21, and the inner groove frame 23 fixedly arranged at the rear of the middle, it is convenient to directly and stably place and install the smart screen assembly 10 inside the front of the mounting rack 20. The structure is simple. Through the plug posts 13 fixedly arranged at the rear corner ends of the screen integrated board 12, the slots one 26 formed at the corner ends of the inner groove frame 23, and the limiting frame 261 fixedly arranged at the rear, the smart screen assembly 10 is more firmly locked after being installed inside the mounting rack 20, with high strength and avoiding easy loosening. And through the support plates 24 welded to the upper and lower ends of the rear of the bottom plate 21, it is convenient to directly position and install above the equipment, with low cost, convenient operation and wide application range.

[0031] Further improved, a power slot 231 is formed in the lower part of the inner groove frame 23. The power slot 231 and the power port 14 are corresponding structures. Heat dissipation holes 232 are formed and distributed in the middle of the inner groove frame 23;

[0032] The arranged power slot 231 is used for corresponding placement with the power port 14 to facilitate the power supply of the output power line, and the heat dissipation holes 232 are used for efficiently dissipating heat from the screen integrated board 12.

[0033] Further improved, a slot two 262 is formed in the inner side end of the limiting frame 261, and locking bolts 263 are connected through threads and distributed at the outer side end of the limiting frame 261;

[0034] The arranged limiting frame 261 is used for inserting the plug posts 13, the slot two 262 is used for inserting the positioning posts 271, and the locking bolts 263 are used for locking the plug posts 13, so that the smart screen assembly 10 is firmly and reliably installed inside the mounting rack 20.

[0035] Further improved, a locking and adjusting device 27 is provided between the limiting frames 261. A partition plate 272 is fixedly provided at the middle of the locking and adjusting device 27. Positioning columns 271 are slidably connected above and below the locking and adjusting device 27. Chutes 273 are provided at the upper and lower ends at the rear of the locking and adjusting device 27. A slider 274 is fixedly provided at the rear of the positioning column 271. The slider 274 is embedded inside the chute 273. A limiting plate 275 is fixedly provided at the rear of the slider 274. The limiting plate 275 is located at the rear of the locking and adjusting device 27. The width of the limiting plate 275 is greater than the width of the slider 274. A push plate 276 is fixedly provided at the rear of the limiting plate 275. A spring rod 277 is welded between the outer side of the slider 274 and the inner side wall of the chute 273;

[0036] The provided positioning column 271 is used for sliding and adjusting inside the positioning insertion slot two 262. The chute 273 is used for limiting the slider 274 and the limiting plate 275, making the adjustment more stable. The push plate 276 is used for manual pushing operation. The spring rod 277 is used for elastically controlling the positioning column 271 to slide and be positioned inside the slot two 262.

[0037] Further improved, a nut 242 is fixedly provided at the front end of the support plate bolt 241. An internal hexagonal groove 243 is provided in front of the nut 242;

[0038] The nut 242 with the internal hexagonal groove 243 is convenient for directly inserting a tool to rotate and operate, and the disassembly and assembly structure is simple.

[0039] Specifically improved, operation slots 25 corresponding to the support plate bolts 241 are provided at the corner ends of the bottom plate 21. A metal groove 253 is provided in front of the operation slot 25. A rotation groove 254 is provided above or below the metal groove 253. A rotating shaft rod 255 is fixedly provided inside the rotation groove 254. A connecting plate 256 is rotatably connected at the middle of the rotating shaft rod 255. A cover plate 251 is fixedly provided at the outer end of the connecting plate 256. A pull ring 252 is fixedly provided on the outer side wall of the cover plate 251. The cover plate 251 is a magnetic adsorption structure;

[0040] The provided operation slot 25 is convenient for inserting and disassembling the support plate bolt 241 to be suitable for equipment installation. The rotation groove 254 is used for embedding and fixing the rotating shaft rod 255. The rotating shaft rod 255 is used for supporting the rotation of the connecting plate 256. The cover plate 251 with a magnetic adsorption structure is used for adsorbing and fixing inside the metal groove 253, and the opening and closing operation is simple.

[0041] Working principle: Place the intelligent screen assembly 10 in front of the mounting frame 20, so that the screen body 11 and the screen integrated board 12 are stably placed inside the limiting groove 22 and the inner groove frame 23;

[0042] The plug post 13 behind the screen integrated board 12 is precisely inserted into the inside of the first slot 26 and the limit frame 261. Through the elastic action of the spring rod 277, the hand-held push plate 276 enables the slider 274 and the limit plate 275 to slide inside the chute 273, and further enables the positioning post 271 to slide outwards and adjust inside the locking adjustment device 27, sequentially passing through the second slot 262 and the positioning slot 131, so that the plug post 13 is fixed inside the limit frame 261. The locking bolt 263 is used to lock the plug post 13 to prevent it from moving, and the installation stability performance is high;

[0043] The power supply port 14 passes through the power supply slot 231 to connect the power supply line for power supply use;

[0044] The hand-held pull ring 252 opens the cover plate 251 outwards. Through the connecting plate 256, it rotates and adjusts outside the rotating shaft rod 255. A tool is used to reach into the operation slot 25 and insert it into the hexagonal socket 243 of the nut 242 to pass the support plate bolt 241 through the support plate 24 and install it on the device. After the operation is completed, the cover plate 251 with a magnetic attraction structure can be adsorbed and fixed inside the metal slot 253 and closed.

[0045] The intelligent screen assembly 10, the screen body 11, the screen integrated board 12, the plug post 13, the positioning slot 131, the power supply port 14, the mounting frame 20, the bottom plate 21, the limit slot 22, the inner groove frame 23, the power supply slot 231, the heat dissipation hole 232, the support plate 24, the support plate bolt 241, the nut 242, the hexagonal socket 243, the operation slot 25, the cover plate 251, the pull ring 252, the metal slot 253, the rotating slot 254, the rotating shaft rod 255, the connecting plate 256, the first slot 26, the limit frame 261, the second slot 262, the locking bolt 263, the locking adjustment device 27, the positioning post 271, the partition plate 272, the chute 273, the slider 274, the limit plate 275, the push plate 276, and the spring rod 277 of the present utility model are all common standard parts or parts known to those skilled in the art. Their structures and principles can all be known by those skilled in the art through technical manuals or through conventional experimental methods. The problem solved by the present utility model is that it is difficult to manually adjust and lock the intelligent screen integrated component after it is placed inside the device shell, which is likely to cause looseness, the overall strength is low, and the overall device shell is not convenient for wide-range installation. Through the mutual combination of the above components, by setting the screen integrated board behind the screen body, the limit slot opened in the front of the bottom plate, and the inner groove frame fixed at the rear of the middle, it is convenient to directly and stably place and install the intelligent screen assembly inside the front of the mounting frame. The structure is simple. Through the plug post fixed at the rear corner end of the screen integrated board, the first slot opened at the corner end of the inner groove frame, and the limit frame fixed at the rear, the intelligent screen assembly is more firmly locked inside the mounting frame, with high strength and avoiding easy loosening. And through the support plates welded at the upper and lower ends of the rear of the bottom plate, it is convenient to directly position and install on the device above, with low cost, convenient operation, and wide application range.

[0046] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0047] In addition, the terms "first", "second", "third", "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", "fourth" may explicitly or implicitly include at least one of such features.

[0048] In the present utility model, unless otherwise clearly defined and limited, the terms "installed", "set", "connected", "fixed", "swivelly connected", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements or the interaction relationship between two elements. Unless otherwise clearly limited, for those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0049] The above shows and describes the basic principles, main features and advantages of the present utility model. For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0050] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A smart screen installation structure for an electric power automation control cabinet, comprising a smart screen assembly (10) and a mounting frame (20), characterized in that: The smart screen assembly (10) comprises a screen body (11) and a screen integrated board (12), wherein the screen integrated board (12) is fixedly arranged at the rear of the screen body (11), a power port (14) is electrically connected to the rear lower part of the screen integrated board (12), and a plug post (13) is fixedly arranged at the rear corner end of the screen integrated board (12), and a positioning groove (131) is provided at the inner side of the plug post (13); The mounting frame (20) comprises a bottom plate (21) and a support plate (24); a limiting groove (22) is provided in front of the bottom plate (21); the middle of the bottom plate (21) is a cavity structure and an inner groove frame (23) is fixedly provided at the rear; a slot one (26) is provided at the corner end of the inner groove frame (23); the slot one (26) is a corresponding structure to the plug column (13); a limiting frame (261) is fixedly provided at the rear of the slot one (26); the support plate (24) is welded to the upper and lower ends of the rear of the bottom plate (21); the support plate (24) is an L-shaped structure; both ends of the support plate (24) are connected with support plate bolts (241) through threads.

2. According to claim 1, the smart screen installation structure of the electric power automation control cabinet is characterized by: A power slot (231) is provided below the inner slot frame (23), the power slot (231) and the power port (14) are corresponding structures, and heat dissipation holes (232) are provided in the middle of the inner slot frame (23).

3. According to claim 1, the smart screen installation structure of the electric power automation control cabinet is characterized by: The inner end of the limiting frame (261) is provided with a second slot (262), and the outer end of the limiting frame (261) is threadedly connected with a locking bolt (263).

4. According to claim 3, the smart screen installation structure of the electric power automation control cabinet is characterized in that: A locking adjustment device (27) is provided between the limit frames (261), a partition plate (272) is fixedly provided in the middle of the locking adjustment device (27), positioning columns (271) are slidably connected to the upper and lower parts of the locking adjustment device (27), a sliding groove (273) is provided at the upper and lower ends of the rear of the locking adjustment device (27), a slider (274) is fixedly provided at the rear of the positioning column (271), the slider (274) is embedded in the interior of the sliding groove (273), a limiting plate (275) is fixedly provided at the rear of the slider (274), the limiting plate (275) is located at the rear of the locking adjustment device (27), the width of the limiting plate (275) is greater than the width of the slider (274), a push plate (276) is fixedly provided at the rear of the limiting plate (275), and a spring rod (277) is welded between the outer side of the slider (274) and the inner side wall of the sliding groove (273).

5. The smart screen installation structure of the electric power automation control cabinet according to claim 1 is characterized in that: A nut (242) is fixedly provided at the front end of the support plate bolt (241), and a hexagonal groove (243) is provided in front of the nut (242).

6. The smart screen installation structure of the electric power automation control cabinet according to claim 5 is characterized by: The corner ends of the bottom plate (21) are each provided with an operating groove (25) corresponding to the support plate bolt (241); a metal groove (253) is provided in front of the operating groove (25); a rotation groove (254) is provided above or below the metal groove (253); a rotating shaft rod (255) is fixedly provided inside the rotating groove (254); a connecting plate (256) is rotatably connected to the middle of the rotating shaft rod (255); a cover plate (251) is fixedly provided at the outer end of the connecting plate (256); a pull ring (252) is fixedly provided on the outer side wall of the cover plate (251); and the cover plate (251) is a magnetic structure.

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