Air insulation ring net cabinet

Abstract

This invention discloses an air-insulated ring main unit, comprising a ring main unit body, a fixed plate fixedly connected to the bottom of the ring main unit body, a fixed shaft fixedly connected inside the fixed plate, a roller rotatably connected to the outside of the fixed shaft, a rotating shaft rotatably connected inside the fixed plate and above the fixed shaft, and a locking mechanism provided outside the rotating shaft and on one side of the roller. This belongs to the technical field of ring main units. The air-insulated ring main unit features a first and second support plate that can be flipped and folded, achieving dual functions through state switching to adapt to different operating conditions. When the two sets of support plates are folded together, they can be spliced ​​to form a stable support base. When the support plates are fully unfolded, they cover the vulnerable four corners of the bottom of the ring main unit, forming a wrap-around anti-collision protective structure. This structure can resist impacts from hard objects and lateral scratches during cabinet transfer and handling, preventing deformation of cabinet corners, paint peeling, and cracking, effectively protecting the integrity of the cabinet structure.

Description

Technical Field

[0001] This invention relates to the field of ring main unit technology, and more specifically, to an air-insulated ring main unit. Background Technology

[0002] A ring main unit is an electrical device that houses a set of power transmission and distribution equipment in a metal or non-metal insulated cabinet or is assembled into a modular ring main unit. Its core components are load switches and fuses. It has advantages such as simple structure, small size, low price, improved power supply parameters and performance, and enhanced power supply safety. It is widely used in substations and prefabricated substations in load centers such as urban residential areas, high-rise buildings, large public buildings, and factories.

[0003] Chinese patent publication CN202421031301.6, entitled "A High-Reliability Insulated Ring Main Unit Structure," describes a high-reliability insulated ring main unit structure that solves the problem of poor stability in existing ring main units supported by rollers, which can cause displacement or even overturning when subjected to scrapes or collisions, resulting in damage to the unit and poor reliability. The structure includes a ring main unit body, a movable door movably installed on the front side of the body, rollers rotatably installed at the four corners of the bottom of the body, a connecting frame fixedly installed on the top of the body, and support transmission components between the top and sides of the body. Mounting frames are fixedly installed on the lower parts of both sides of the body, and support plates are rotatably installed in the middle of the two mounting frames. "Two support plates are fixedly installed on opposite sides of each other, with support columns installed on each side." The cabinet is moved by bottom rollers and stationary support is achieved by a single-sided support plate structure, which improves the stability of the cabinet to a certain extent. However, there are still many defects and shortcomings in actual use. First, the existing ring main unit's support and protection structure has a single function and poor adaptability to working conditions. The traditional support structure only has a single stationary support function and cannot achieve structural state switching. It is difficult to take into account both the two core working conditions of cabinet transportation and stationary operation. During the transportation of the cabinet, the corners are exposed without a dedicated anti-collision protection structure, which makes it very easy to be hit by hard objects on site and scraped from the side, resulting in deformation, paint peeling, and cracking of the cabinet corners, damaging the integrity of the cabinet structure. Therefore, we provide an air-insulated ring main unit. Summary of the Invention

[0004] The purpose of this invention is to provide an air-insulated ring main unit to solve the problems mentioned in the background section: The existing ring main unit has a single function in terms of support and protection structure, and cannot achieve structural state switching. During the transfer of the unit, the corners are exposed and there is no dedicated anti-collision protection structure, making it extremely susceptible to impacts and lateral scratches from hard objects on site.

[0005] To achieve the above objectives, the present invention provides the following technical solution: An air-insulated ring main unit includes a ring main unit body, a top plate on the top of the ring main unit body, a fixed plate fixedly connected to the bottom of the ring main unit body, a fixed shaft fixedly connected inside the fixed plate, a roller rotatably connected to the outside of the fixed shaft, a rotating shaft rotatably connected inside the fixed plate and above the fixed shaft, a locking mechanism provided outside the rotating shaft and on one side of the roller to prevent problems such as spontaneous slippage, back-and-forth movement, and positional deviation due to the roller not being locked, first support plates fixedly connected to both ends of the rotating shaft, a fixed rod fixedly connected to the outside of the first support plate, a first gear fixedly connected to the outside of the fixed rod near the first support plate, a rotating plate rotatably connected to the outside of the fixed rod away from the first support plate, a connecting rod rotatably connected between the rotating plate and the fixed shaft, a rotating rod rotatably connected inside the rotating plate and above the fixed rod, and a second support plate fixedly connected to the other end of the rotating rod. A second gear is fixedly connected to the outside of the moving rod and between the rotating plate and the second support plate. The second gear meshes with the first gear. A transmission mechanism is set at the bottom of the ring main unit. The transmission mechanism can synchronously drive the two rotating shafts on the left and right sides of the bottom of the ring main unit to rotate synchronously. When the rotating shaft is driven to rotate by the transmission mechanism, the rotating shaft will drive the first support plate fixed at both ends to rotate and swing synchronously. During the rotation, the first support plate will be pulled to rotate around the fixed rod by the hinge push-pull linkage of the connecting rod. This will cause the second support plate to rotate and adjust its position and angle with the mechanism. During the overall linkage operation, the meshing transmission between the first gear and the second gear can drive the second support plate to generate independent rotational compensation motion. The rotation direction of the second support plate is always opposite to that of the first support plate, which can accurately realize the switching between the two working states of folding and unfolding between the second support plate and the first support plate.

[0006] Preferably, the first support plate and the second support plate both have an L-shaped cross-section. Both the first support plate and the second support plate are used in conjunction with the ring main unit body. Since the first support plate and the second support plate both adopt an L-shaped cross-section, they have the structural characteristics of right-angle wrapping. After unfolding, they can be precisely fitted and covered at the corners of the ring main unit body to form a wrap-around protective barrier, which can effectively cover and protect the vulnerable corners of the ring main unit body.

[0007] Preferably, the transmission mechanism includes a dual-axis motor, which is fixedly connected to the ring main unit body. A worm gear is fixedly connected to the output end of the dual-axis motor. A first housing is sleeved on the outside of the rotating shaft, and the first housing is fixedly connected to the ring main unit body. The rotating shaft is rotatably connected to the first housing. The worm gear vertically penetrates the first housing and extends into the interior of the first housing. The worm gear is rotatably connected to the first housing. A worm wheel is sleeved on the outside of the rotating shaft and above the worm gear. The worm wheel is fixedly connected to the rotating shaft. The worm gear and the worm wheel are meshed together. In actual operation, after the dual-axis motor is powered on and started, its two output ends can synchronously drive the worm gears on both sides to rotate. Relying on the meshing transmission action of the worm gear and the worm wheel, the vertical rotational power is smoothly transmitted to the worm wheel, thereby driving the worm wheel to rotate together with the rotating shaft, providing a stable power input for the subsequent folding and unfolding actions of the first support plate and the second support plate.

[0008] Preferably, a control switch is fixedly connected to the bottom of the ring main unit. The dual-axis motor is electrically connected to the control switch. The start, stop, forward and reverse rotation of the dual-axis motor are controlled by the control switch. The operator can manually operate the control switch to achieve precise control of the operating status of the dual-axis motor. The operator can also control the dual-axis motor to rotate in the forward and reverse directions, thereby precisely controlling the first support plate and the second support plate to smoothly switch between the two states of folding and unfolding. A waterproof heat dissipation vent is provided at the bottom of the ring main unit on one side of the control switch. The edge of the waterproof heat dissipation vent is provided with a waterproof baffle. The vent itself is a small-mesh ventilation mesh structure.

[0009] Preferably, the locking mechanism includes a fixed sleeve, which is sleeved on the outside of the rotating shaft and fixedly connected to the rotating shaft. A movable sleeve is sleeved on the outside of the fixed sleeve and slidably connected to the fixed sleeve. A first sliding groove is formed inside the fixed sleeve on the side near the movable sleeve, and a second sliding groove is formed inside the fixed sleeve on the side away from the movable sleeve. The second sliding groove communicates with the first sliding groove. A sliding rod is slidably connected inside the first sliding groove and fixedly connected to the movable sleeve. A push plate is fixedly connected to the outside of the movable sleeve. A top rod is fixedly connected to one side of the fixed plate. The top rod penetrates the fixed plate vertically and extends to the other side of the fixed plate. The top rod is slidably connected to the fixed plate. The top rod works in conjunction with the roller. During the movement of the movable sleeve, the push plate fixed on the outside is moved in a coordinated displacement. Then, the push plate pushes the top rod to move forward smoothly in a preset direction. When the top rod gradually approaches and fits against the side of the roller, it can form a rigid clamping limit from the side of the roller. The roller is restricted from rotating freely by the restraining force of the top rod, thereby realizing the mechanical locking and positioning of the roller and effectively preventing the roller from rotating, slipping, or shifting.

[0010] Preferably, the first chute is a spiral structure. Under the sloping thrust of the spiral chute wall, the slide rod generates axial displacement along the track, thereby driving the movable sleeve to make a linear translational motion. The second chute is a flat straight chute structure. The chute direction has no angular deflection and sloping extrusion, so it can no longer generate lateral thrust and displacement driving effect on the slide rod.

[0011] Preferably, a rubber pad is fixedly connected to the outer end of the push rod near the roller. The rubber pad can prevent direct metal-to-metal contact between the push rod and the roller, prevent the push rod itself and the roller surface from being damaged by bumps, extend the service life of each component, and improve the stability and durability of the overall mechanism during operation.

[0012] Preferably, a second housing is fitted around the fixed rod, and the second housing is fixedly connected to the rotating plate. The second housing can effectively block external debris and other contaminants from entering the meshing gap, avoiding problems such as rust and meshing jamming. At the same time, it can prevent operators from accidentally touching the rod and effectively avoid safety hazards.

[0013] Preferably, a maintenance opening is provided on one side edge of the top plate, allowing for top-down inspection and maintenance, and for repairing the dead corners of the inner wall of the cabinet. A side cover is installed above the maintenance opening, and several sets of screws connect the side cover to the ring main unit body. A sealing ring is installed between the side cover and the maintenance opening. A side frame is vertically installed on the top of the second support plate, and a limit bolt is vertically installed on the side frame through screw holes. A silicone pad is installed at the bottom end of the limit bolt through a bearing, and the silicone pad contacts and limits the screw below.

[0014] Preferably, a wireless transmission module is installed on the side cover. In the use of the ring main unit, especially outdoors or in other situations requiring long-distance signal transmission, it can transmit data from the inner wall of the ring main unit to a remote terminal. The bottom of the wireless transmission module extends to the bottom of the side cover, forming a mounting bracket. Besides conventional signal processing and transceiver components, a spare battery is detachably installed at the bottom of the wireless transmission module to provide power for signal transmission and even control switches. A sensor assembly is installed at the bottom of the wireless transmission module on the side of the spare battery. This sensor assembly includes a combination of conventional sensors such as temperature and humidity sensors. A connection unit is detachably installed between the bottom of the spare battery and the inner wall of the ring main unit. This is a plug-in electrical connection component, allowing electrical connection between the internal circuitry of the ring main unit and the wireless transmission module. A fire extinguishing ball, a conventional dry powder fire extinguishing ball, is installed on one side of the bottom of the wireless transmission module. This ball can automatically extinguish fires inside the ring main unit. Because the entire side cover can be opened, the fire extinguishing ball and other components can be removed and replaced simultaneously.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1) When in use, the first and second support plates of this air-insulated ring main unit can be flipped and folded in half, achieving dual functions through state switching to adapt to different working conditions of the ring main unit. When the two sets of support plates are folded together, they can be spliced ​​to form a stable support base, lifting the entire ring main unit off the ground and replacing the rollers to bear the weight of the equipment, ensuring the stability of the cabinet during static installation and fixed operation. When the support plates are fully unfolded, their L-shaped cross-section structure can accurately cover the vulnerable parts at the four corners of the bottom of the ring main unit, forming a wrap-around anti-collision protection structure. This can resist the impact of hard objects and lateral scratches during the transfer and handling of the cabinet, prevent the corners of the cabinet from deforming, paint peeling and cracking, effectively protect the integrity of the cabinet structure, and realize the integration of static support and transfer protection, greatly improving the practicality and adaptability of the equipment to working conditions.

[0016] 2) This air-insulated ring main unit employs a sequential linkage structure combining spiral and straight sliding grooves. This allows for automatic pre-locking of the rollers before the support plate unfolds, solving the problem of asynchronous locking and protective actions in traditional equipment. During operation, the rotating shaft drives the fixed sleeve to rotate, squeezing the sliding rod through the spiral first sliding groove. This drives the top rod to move forward and tighten the rollers, completing fully automatic mechanical locking before the support plate unfolds. This effectively prevents cabinet slippage, movement, and offset. After locking, the sliding rod automatically slides into the straight second sliding groove, releasing displacement restrictions and ensuring smooth unfolding of the subsequent support plate. This achieves an automated operation logic of locking and positioning first, followed by unfolding and protection, eliminating the need for manual step-by-step operation and preventing cabinet shaking during adjustment. Combined with the self-locking characteristics of the worm gear, this provides double protection for stable equipment operation, significantly improving operational safety and structural linkage reliability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the first and second support plates of the present invention when they are retracted; Figure 2 This is a schematic diagram of the structure of the first and second support plates of the present invention when unfolded; Figure 3 This is a schematic diagram of the control switch structure of the present invention; Figure 4 This is a schematic diagram of the connecting rod structure of the present invention; Figure 5 This is a schematic diagram of the first support plate structure of the present invention; Figure 6 This is a schematic diagram of the first housing structure of the present invention; Figure 7 This is a schematic diagram of the first groove structure of the present invention; Figure 8 This is a schematic diagram of the slide bar structure of the present invention; Figure 9 This is a schematic diagram of the side cover structure of the present invention.

[0018] Explanation of the numbers in the diagram: 1. Ring main unit body; 2. Fixing plate; 3. Fixing shaft; 4. Roller; 5. Rotating shaft; 6. First support plate; 7. Fixing rod; 8. First gear; 9. Rotating plate; 10. Rotating rod; 11. Second gear; 12. Second support plate; 13. Connecting rod; 14. Transmission mechanism; 15. Locking mechanism; 16. Dual-axis motor; 17. Worm gear; 18. First housing; 19. Worm wheel; 20. Fixed sleeve; 21. Movable sleeve 22. First slide rail; 23. Second slide rail; 24. Slide rod; 25. Push plate; 26. Top rod; 27. Rubber pad; 28. Control switch; 29. ​​Second housing; 30. Top plate; 31. Sealing ring; 32. Maintenance port; 33. Side cover; 34. Wireless transmission module; 35. Limit bolt; 36. Side frame; 37. Screw; 38. Spare battery; 39. Connection unit; 40. Fire extinguishing ball; 41. Sensor assembly; 42. Waterproof vent. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1 to 9An air-insulated ring main unit includes a ring main unit body 1. A top plate 30 is provided on the top of the ring main unit body 1. A fixing plate 2 is fixedly connected to the bottom of the ring main unit body 1. A fixing shaft 3 is fixedly connected inside the fixing plate 2. A roller 4 is rotatably connected to the outside of the fixing shaft 3. A rotating shaft 5 is rotatably connected inside the fixing plate 2 and above the fixing shaft 3. A locking mechanism 15 is provided outside the rotating shaft 5 and on one side of the roller 4. First support plates 6 are fixedly connected to both ends of the rotating shaft 5. A fixing rod 7 is fixedly connected to the outside of the first support plate 6. A first gear 8 is fixedly connected to the outside of the fixing rod 7 near the first support plate 6. A rotating plate 9 is rotatably connected to the outside of the fixing rod 7 away from the first support plate 6. The rotating plate 9 is connected to the fixing shaft 3. A connecting rod 13 is rotatably connected between the rotating plate 9 and the fixed rod 7. A rotating rod 10 is rotatably connected inside the rotating plate 9 and above the fixed rod 7. A second support plate 12 is fixedly connected to the other end of the rotating rod 10. A second gear 11 is fixedly connected outside the rotating rod 10 and between the rotating plate 9 and the second support plate 12. The second gear 11 meshes with the first gear 8. A transmission mechanism 14 is provided at the bottom of the ring main unit 1. The transmission mechanism 14 can synchronously drive the two rotating shafts 5 on the left and right sides of the bottom of the ring main unit 1 to rotate synchronously. When the rotating shafts 5 are driven to rotate by the transmission mechanism 14, the rotating shafts 5 will drive the first support plates 6 fixed at both ends to rotate and swing synchronously. During the rotation, the first support plates 6 rely on the hinge of the connecting rod 13 to push The linkage mechanism pulls the rotating plate 9 to rotate adaptively around the fixed rod 7, thereby causing the second support plate 12 to rotate and adjust its angle. During the overall linkage operation, the meshing transmission between the first gear 8 and the second gear 11 drives the second support plate 12 to produce independent rotational compensation motion. The rotation direction of the second support plate 12 is always opposite to that of the first support plate 6, accurately realizing the switching between the two working states of folding and unfolding between the second support plate 12 and the first support plate 6. When the second support plate 12 and the first support plate 6 have completed folding, the first support plate 6, together with the rotating plate 9, forms a stable support base, which can lift the entire ring main unit 1 off the ground and share the load of the cabinet. The second support plate 12 replaces the roller 4 to bear the weight of the equipment, achieving stable support and positioning of the ring main unit when it is stationary. When the second support plate 12 and the first support plate 6 are fully extended, the two sets of support plates cooperate to cover and protect the four corners of the bottom of the ring main unit body 1, forming an all-round anti-collision protection structure. This effectively prevents collisions with external hard objects, scrapes on corners, and lateral bumps during the relocation, transportation, and on-site handling of the ring main unit, providing reliable protection for the corners and shell structure of the ring main unit. At the same time, the matching locking mechanism 15 is specifically used to reliably lock and position the roller 4. When the second support plate 12 and the first support plate 6 are extended, the rotational freedom of the roller 4 is locked, preventing problems such as spontaneous slippage, forward and backward movement, and positional deviation caused by the roller 4 not being locked.To prevent overall displacement of the ring main unit 1 from interfering with the support stability and protective effect of the first support plate 6 and the second support plate 12, and to ensure the stable operation of the entire device.

[0021] Specifically, both the first support plate 6 and the second support plate 12 have an L-shaped cross-section. Both the first support plate 6 and the second support plate 12 are used in conjunction with the ring main unit body 1. Since both the first support plate 6 and the second support plate 12 adopt an L-shaped cross-section, they have the structural characteristic of right-angle wrapping. After unfolding, they can accurately fit and cover the corners of the ring main unit body 1, forming a wrap-around protective barrier. This can effectively cover and protect the vulnerable corners of the ring main unit body 1. During the overall handling and relocation of the ring main unit body 1, it can effectively resist external hard object impacts, lateral scratches, and corner bumps, avoiding problems such as deformation, paint peeling, and cracking of the corners of the ring main unit body 1. This comprehensively improves the protective performance of the ring main unit body 1 during transportation and storage.

[0022] Furthermore, the transmission mechanism 14 includes a dual-axis motor 16, which is fixedly connected to the ring main unit 1. A worm gear 17 is fixedly connected to the output end of the dual-axis motor 16. A first housing 18 is sleeved on the outside of the rotating shaft 5, and the first housing 18 is fixedly connected to the ring main unit 1. The rotating shaft 5 is rotatably connected to the first housing 18. The worm gear 17 vertically penetrates the first housing 18 and extends into its interior, and is rotatably connected to the first housing 18. A worm wheel 19 is sleeved on the outside of the rotating shaft 5 and above the worm gear 17. The worm wheel 19 is fixedly connected to the rotating shaft 5, and the worm gear 17 and worm wheel 19 are meshed together. In actual operation, after the dual-axis motor 16 is powered on and started... The output ends of the worm gear 17 on both sides can synchronously drive the worm gear 17 to rotate. Relying on the meshing transmission between the worm gear 17 and the worm wheel 19, the vertical rotational power is smoothly transmitted to the worm wheel 19, which in turn drives the worm wheel 19 to rotate together with the rotating shaft 5. While the rotating shaft 5 is rotating, it synchronously drives the first support plate 6 fixed at the end to rotate, thereby providing a stable power input for the subsequent folding and unfolding of the first support plate 6 and the second support plate 12. Moreover, the transmission of the worm wheel 19 and the worm gear 17 has a reverse self-locking characteristic, which can lock the angle position of the rotating shaft 5 after the machine stops, preventing the first support plate 6 from deflecting on its own due to external force, thus improving the stability and reliability of the overall structure.

[0023] Furthermore, a control switch 28 is fixedly connected to the bottom of the ring main unit 1. The dual-axis motor 16 is electrically connected to the control switch 28. The start, stop, and forward / reverse rotation of the dual-axis motor 16 are controlled by the control switch 28. The operator can manually operate the control switch 28 to achieve precise control of the operating status of the dual-axis motor 16. It can not only control the power-on start and power-off stop of the dual-axis motor 16, but also switch the circuit conduction direction, thereby controlling the dual-axis motor 16 to rotate in the forward and reverse directions. With the help of the start, stop, and forward / reverse switching of the dual-axis motor 16, it can be used in conjunction with the transmission mechanism 1. 4 drives the rotating shaft 5 to complete rotation in different directions, thereby precisely controlling the first support plate 6 and the second support plate 12 to smoothly switch between folded and unfolded states, adapting to the usage needs of different working conditions such as on-site transportation and parking protection. The bottom of the ring network cabinet body 1 on one side of the control switch 28 is equipped with a waterproof heat dissipation port 42. The edge of the waterproof heat dissipation port 42 is equipped with a waterproof baffle. It is a small-mesh ventilation mesh structure. When fully unfolded, the actual height of the waterproof heat dissipation port 42 is relatively high, which can achieve a stable heat dissipation effect without encountering problems such as rainwater seepage.

[0024] Furthermore, the locking mechanism 15 includes a fixed sleeve 20, which is sleeved on the outside of the rotating shaft 5 and is fixedly connected to the rotating shaft 5. A movable sleeve 21 is sleeved on the outside of the fixed sleeve 20 and is slidably connected to the fixed sleeve 20. A first groove 22 is provided inside the fixed sleeve 20 on the side close to the movable sleeve 21, and a second groove 23 is provided inside the fixed sleeve 20 on the side away from the movable sleeve 21. The second groove 23 communicates with the first groove 22. A slide rod 24 is slidably connected inside the first groove 22 and is fixedly connected to the movable sleeve 21. A push plate 25 is fixedly connected to the outside of the movable sleeve 21. A top rod 26 is fixedly connected to the outside of the push plate 25 and on one side of the fixed plate 2. The top rod 26 vertically penetrates the fixed plate 2 and extends to the other side of the fixed plate 2. The top rod 26 is slidably connected to the fixed plate 2 and is used in conjunction with the roller 4.

[0025] Furthermore, the first groove 22 has a spiral structure. Under the thrust of the slope of the spiral groove wall, the slide rod 24 generates axial displacement along the track, thereby driving the movable sleeve 21 to make linear translational movement. During the movement, the movable sleeve 21 synchronously drives the push plate 25 fixed on the outside to move in linkage. Then, the push plate 25 pushes the top rod 26 to move forward smoothly in the preset direction. When the top rod 26 gradually approaches and fits against the side of the roller 4, it can form a rigid clamping limit from the side of the roller 4. Relying on the restraining force of the top rod 26, the roller 4 is restricted from rotating freely, thereby realizing the mechanical locking and positioning of the roller 4, effectively preventing the roller 4 from rotating, slipping, or shifting. After the top rod 26 completes the clamping and locking of the roller 4, as the rotating shaft 5 and the fixed sleeve 20 continue to rotate in the same direction, the slide rod 24 will slide smoothly out along the spiral track of the first groove 22 and smoothly transition into the interior of the second groove 23. The second groove 23 is flat. The straight channel structure, with no angular deflection or slope compression, can no longer generate lateral thrust or displacement driving effect on the slide rod 24. At this time, the roller 4 is in a completely locked and fixed state and no longer changes position, while the rotating shaft 5 can continue to rotate without interference or restriction from the locking mechanism 15. Relying on the straight and non-compression structural characteristics of the second slide 23, the subsequent continuous rotation of the rotating shaft 5 can be unhindered by the locking mechanism 15, thereby driving the first support plate 6 and the second support plate 12 to complete the automatic opening and closing action. The overall structure adopts a linkage design of segmented cooperation between spiral slide and straight slide, realizing the sequential action of locking the roller 4 first and then automatically opening the first support plate 6 and the second support plate 12. There is no need for separate step-by-step operation. The mechanical linkage logic is coherent, the structural linkage is strong, and the operation is stable and reliable. It can ensure that the roller 4 is locked and positioned immediately after the ring main body 1 is moved, and can also simultaneously and automatically complete the opening and protection of the corner protection.

[0026] Furthermore, a rubber pad 27 is fixedly connected to the outer end of the push rod 26 near the roller 4. The rubber pad 27 can prevent the push rod 26 and the roller 4 from direct metal-to-metal contact. On the one hand, it can prevent deformation, scratches, wear and rigid impact damage to the push rod 26 and the roller 4. On the other hand, it can reduce the impact noise during locking and buffer the vibration generated by mechanical action. It plays a good protective role for both the push rod 26 and the roller 4, extends the service life of each component, and improves the stability and durability of the overall mechanism during operation.

[0027] Furthermore, a second housing 29 is fitted around the fixed rod 7. The second housing 29 is fixedly connected to the rotating plate 9. The second housing 29 can provide all-round isolation and protection for the meshing first gear 8 and second gear 11, effectively preventing external debris and other contaminants from entering the meshing gap, avoiding problems such as rust and meshing jamming, preventing the first gear 8 and second gear 11 from being deformed or broken by external impact, and preventing accidental contact by operators, effectively avoiding safety hazards, and improving the safety of equipment use and overall operational stability.

[0028] Furthermore, a maintenance opening 32 is provided on one edge of the top plate 30, allowing for top-down inspection and maintenance, particularly for repairing hard-to-reach corners of the cabinet's inner wall. A side cover 33 is installed above the maintenance opening 32, covering it. Several sets of screws 37 connect the side cover 33 to the ring main unit 1, creating a threaded connection. A sealing ring 31 is installed between the side cover 33 and the maintenance opening 33 to seal the gap, achieving a waterproof effect. A side frame 36 is vertically installed on the top of the second support plate 12, extending to... At the upper edge of the side cover 33, a limit bolt 35 is vertically installed on the side frame 36 through a screw hole. It can rotate and move up and down under force. The bottom end of the limit bolt 35 is equipped with a silicone pad through a bearing, and the silicone pad contacts and limits the screw 37 below. In fact, it contacts the screw 37 at the outermost position. Moreover, when the locking roller 4 is on the ground, the limit bolt 35 can drive the silicone pad to move downwards and squeeze the screw 37 when the entire ring main unit 1 moves. When the ring main unit 1 is subjected to vibration, the silicone pad can limit the screw 37 and even the side cover 33 downwards to avoid damage from vibration.

[0029] Furthermore, a wireless transmission module 34 is installed on the side cover 33. In the use of the ring main unit, especially outdoors or in other situations requiring long-distance signal transmission, it can transmit data from the inner wall of the ring main unit to a remote terminal. The bottom of the wireless transmission module 34 extends to the underside of the side cover 33, forming a mounting bracket. In addition to conventional signal processing and transceiver components, a spare battery 38 is detachably installed at the bottom of the wireless transmission module 34 to provide power for signal transmission and even control switches 28. A sensor assembly 41 is installed at the bottom of the wireless transmission module 34 on the side of the spare battery 38. The sensor assembly 41 includes conventional sensors such as temperature and humidity sensors. The combination of the backup battery 38 and the inner wall of the ring main unit 1 has a detachable connection unit 39, which is a plug-in electrical connection component, so that the internal circuit of the ring main unit 1 can be electrically connected to the wireless transmission module 34. A fire extinguishing ball 40 is installed on one side of the bottom of the wireless transmission module 34. It is a conventional dry powder fire extinguishing ball, which can extinguish fires in the event of a fire inside the ring main unit 1. Since the entire side cover 33 can be opened, the fire extinguishing ball 40 can be removed and replaced at the same time. Alternatively, after the side cover 33 is opened, the internal corners of the ring main unit 1 below can be inspected from top to bottom.

[0030] The invention is used as follows: When in use, the air-insulated ring main unit 1 can be moved and installed by the bottom rollers 4. The operator controls the dual-axis motor 16 to start, stop, and rotate via the control switch 28 at the bottom of the ring main unit 1. The dual-axis motor 16 drives the worm gears 17 at both ends to rotate synchronously. Through the meshing and deceleration transmission of the worm gears 17 and worm wheel 19, the rotating shaft 5 rotates smoothly. When the rotating shaft 5 rotates, it synchronously drives the first support plate 6 to swing. Under the hinge traction of the connecting rod 13, it drives the rotating plate 9 to deflect. Then, through the meshing transmission of the first gear 8 and the second gear 11, the second support plate 12 and the first support plate 6 rotate in opposite directions, achieving the switching between folded and unfolded states. During the rotation of the rotating shaft 5, it synchronously drives the fixed sleeve 20 of the locking mechanism 15 to rotate. With the help of the slope guidance of the spiral first slide groove 22, it squeezes the slide rod 24, pushing the movable sleeve 21, push plate 25, and top rod 26 forward, causing the rubber pad at the end of the top rod 26 to... Block 27 laterally presses against roller 4, completing the mechanical locking of roller 4 and preventing the ring main unit 1 from sliding or moving. After the sliding rod 24 continues to rotate with the fixed sleeve 20, it slides into the second sliding groove 23 of the straight structure, no longer generating axial thrust. Roller 4 remains locked, and the rotating shaft 5 can continue to rotate freely, realizing the sequential linkage of locking roller 4 first and then automatically unfolding the first support plate 6 and the second support plate 12. When the first support plate 6 and the second support plate 12 are folded together, a support base can be formed, which will hold the ring main unit 1 in place. The main body of the ring main unit 1 is lifted off the ground, replacing the rollers 4 to bear the weight of the main body of the ring main unit 1, so as to achieve stable placement. The first support plate 6 and the second support plate 12 are both L-shaped cross-section structures. When fully unfolded, they cover the four bottom corners of the main body of the ring main unit 1 to form a wrap-around anti-collision protection, avoiding bumps, scratches, deformation and cracks of the cabinet corners during transportation. It automatically completes multiple functions such as displacement, locking, support and anti-collision protection, and is suitable for various working conditions such as installation, transportation and static storage of the main body of the ring main unit 1.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An air-insulated ring main unit, comprising a ring main unit body (1), a top plate (30) provided on the top of the ring main unit body (1), a fixing plate (2) fixedly connected to the bottom of the ring main unit body (1), a fixing shaft (3) fixedly connected inside the fixing plate (2), and a roller (4) rotatably connected to the outside of the fixing shaft (3), characterized in that: A rotating shaft (5) is rotatably connected inside the fixed plate (2) and above the fixed shaft (3). A locking mechanism (15) is provided outside the rotating shaft (5) and on one side of the roller (4). A first support plate (6) is fixedly connected to both ends of the rotating shaft (5). A fixed rod (7) is fixedly connected to the outside of the first support plate (6). A first gear (8) is fixedly connected to the outside of the fixed rod (7) near the first support plate (6). A rotating plate (8) is rotatably connected to the outside of the fixed rod (7) away from the first support plate (6). 9), a connecting rod (13) is rotatably connected between the rotating plate (9) and the fixed shaft (3). A rotating rod (10) is rotatably connected inside the rotating plate (9) and above the fixed rod (7). A second support plate (12) is fixedly connected to the other end of the rotating rod (10). A second gear (11) is fixedly connected outside the rotating rod (10) and between the rotating plate (9) and the second support plate (12). The second gear (11) meshes with the first gear (8). A transmission mechanism (14) is provided at the bottom of the ring main body (1).

2. The air-insulated ring main unit according to claim 1, characterized in that: The first support plate (6) and the second support plate (12) both have an L-shaped cross-section, and both the first support plate (6) and the second support plate (12) are used in conjunction with the ring main unit (1).

3. The air-insulated ring main unit according to claim 1, characterized in that: The transmission mechanism (14) includes a dual-axis motor (16), which is fixedly connected to the ring main unit (1). The output end of the dual-axis motor (16) is fixedly connected to a worm (17). A first housing (18) is sleeved on the outside of the rotating shaft (5). The first housing (18) is fixedly connected to the ring main unit (1). The rotating shaft (5) is rotatably connected to the first housing (18). The worm (17) vertically penetrates the first housing (18) and extends into the interior of the first housing (18). The worm (17) is rotatably connected to the first housing (18). A worm wheel (19) is sleeved on the outside of the rotating shaft (5) and above the worm (17). The worm wheel (19) is fixedly connected to the rotating shaft (5). The worm (17) and the worm wheel (19) are meshed together.

4. The air-insulated ring main unit according to claim 3, characterized in that: A control switch (28) is fixedly connected to the bottom of the ring main unit (1). The dual-axis motor (16) is electrically connected to the control switch (28). A waterproof heat dissipation port (42) is provided at the bottom of the ring main unit (1) on one side of the control switch (28).

5. The air-insulated ring main unit according to claim 1, characterized in that: The locking mechanism (15) includes a fixed sleeve (20), which is sleeved on the outside of the rotating shaft (5) and fixedly connected to the rotating shaft (5). A movable sleeve (21) is sleeved on the outside of the fixed sleeve (20), and the movable sleeve (21) is slidably connected to the fixed sleeve (20). A first sliding groove (22) is provided on the side of the fixed sleeve (20) near the movable sleeve (21), and a second sliding groove (23) is provided on the side of the fixed sleeve (20) away from the movable sleeve (21). The groove (23) is connected to the first sliding groove (22). The sliding rod (24) is slidably connected inside the first sliding groove (22). The sliding rod (24) is fixedly connected to the movable sleeve (21). The outside of the movable sleeve (21) is fixedly connected to the push plate (25). The outside of the push plate (25) and on one side of the fixed plate (2) is fixedly connected to the top rod (26). The top rod (26) vertically penetrates the fixed plate (2) and extends to the other side of the fixed plate (2). The top rod (26) is slidably connected to the fixed plate (2). The top rod (26) is used in conjunction with the roller (4).

6. The air-insulated ring main unit according to claim 5, characterized in that: The first groove (22) has a spiral structure.

7. The air-insulated ring main unit according to claim 5, characterized in that: A rubber pad (27) is fixedly connected to the outer end of the top rod (26) near the roller (4).

8. The air-insulated ring main unit according to claim 1, characterized in that: The fixing rod (7) is fitted with a second housing (29), which is fixedly connected to the rotating plate (9).

9. The air-insulated ring main unit according to claim 1, characterized in that: A maintenance port (32) is provided on one side edge of the top plate (30). A side cover (33) is installed above the maintenance port (32). Several sets of screws (37) are connected between the side cover (33) and the ring main unit (1). A sealing ring (31) is installed between the side cover (33) and the maintenance port (33). A side frame (36) is vertically installed on the top of the second support plate (12). A limit bolt (35) is vertically installed on the side frame (36) through a screw hole. A silicone pad is installed at the bottom end of the limit bolt (35) through a bearing. The silicone pad contacts and limits the screw (37) below.

10. An air-insulated ring main unit according to claim 9, characterized in that: A wireless transmission module (34) is installed on the side cover (33). The bottom of the wireless transmission module (34) extends to the bottom of the side cover (33). A spare battery (38) is detachably installed on the bottom of the wireless transmission module (34). A sensor assembly (41) is installed on the bottom of the wireless transmission module (34) on one side of the spare battery (38). A connection unit (39) is detachably installed between the bottom of the spare battery (38) and the inner wall of the ring network cabinet body (1). A fire extinguishing ball (40) is installed on one side of the bottom of the wireless transmission module (34).

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