A high-stability steel structure thermal insulation wall
By adopting a high-stable steel structure insulation wall in the movable plate house, using cross-shift mechanism, docking mechanism and reinforcement mechanism, combined with the filling of rock wool and aluminum plates, the problems of fragility and complex fixation of traditional insulation walls are solved, and stable connection and efficient insulation of the wall are achieved.
Patent Information
- Application Number
- CN202411790771.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2044-12-06
AI Technical Summary
The insulation wall materials of traditional movable board rooms are fragile and are easily damaged by slight external force during construction. The fixing method is complex, which affects stability and reusable quality.
The wall is heat-insulating with a high-stable steel structure. Through a symmetrically arranged cross-shift mechanism, docking mechanism, support rod and reinforcement mechanism, combined with the filling of rock wool and aluminum plates, stable connection and efficient insulation of the wall are achieved.
It improves the stability and construction efficiency of the wall, reduces the installation complexity and cost, ensures the integrity and structural strength of the wall during use, and provides excellent thermal insulation performance.
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Figure CN119266420B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of wall insulation, and in particular to a high-stability steel structure insulation wall. Background Art
[0002] The insulation materials commonly used in the insulation walls of traditional prefabricated houses, such as polystyrene foam boards, have certain insulation properties, but the materials are relatively brittle. In daily use, they are easily damaged by slight external impacts, such as bumps of tools during construction, and careless collisions of materials with walls during transportation. For example, if building materials at the construction site fall and hit the insulation wall, the insulation board may crack or break, thus affecting its insulation performance.
[0003] Since most of the walls of prefabricated houses are made of non-brick and other high-hardness and heavy materials, and the walls of prefabricated houses are designed for easy movement and reuse, the wall materials of prefabricated houses will be easily affected by factors such as temperature, humidity, light, aging, and the number of times they are disassembled and assembled in the use environment. These factors will directly affect the quality of the prefabricated house when it is used next time, such as the ease of connection between panels, the size of the gap, and the overall stability.
[0004] For example, in the prior art, most bolts and rivets are used to fix the wall frame. Drilling holes in the wall panels each time will cause two problems. First, reusing the holes from the previous time will cause poor overall stability of the panel house. Second, re-drilling holes will damage the interior of the wall panels, which not only affects the appearance, but also easily damages the thermal insulation materials, sound insulation materials and gap tolerances inside the wall panels.
[0005] In view of the above problems, the present invention proposes a high-stability steel structure thermal insulation wall. Summary of the invention
[0006] Based on the existing steel wall disassembly and insulation technical problems, the present invention proposes a high-stability steel structure insulation wall.
[0007] A highly stable steel structure thermal insulation wall proposed by the present invention includes symmetrically arranged crossbar mechanisms. One end of each crossbar mechanism is provided with a docking mechanism. A plurality of support rods are arranged between the two crossbar mechanisms. The outer side surfaces of each crossbar mechanism are arrayed with reinforcement mechanisms. The crossbar mechanism includes a crossbar plate. Installation grooves are opened on both sides of the upper end of the crossbar plate. The inner wall of the installation groove is threadedly connected with a limiting block. The upper end of the crossbar plate is arrayed with limiting columns. The lower end of the crossbar plate is provided with a limiting hole adapted to the limiting column. A plurality of threaded holes are arrayed on the upper end of the crossbar plate. A bolt is threadedly connected to the inner wall of each threaded hole. A sliding groove is opened on one long side surface of the crossbar plate. The lower inner wall of the threaded hole is communicated with the inner wall of the sliding groove. The two ends of the support rod are spherical. The inner wall of the sliding groove is adapted to the two ends of the support rod. A fixing groove is opened on the other long side surface of the crossbar plate. A fixing mechanism is arranged inside the fixing groove. Limiting frames are arrayed on the short side surface of the crossbar plate.
[0008] Preferably, the fixing mechanism includes a push rod slidably connected to the inner wall of the fixing groove. One end of the push rod is fixedly connected with a sliding rod. Two limiting rings I are arranged on the inner wall of the fixing groove. The outer side surface of the limiting ring I is fixedly connected with the inner wall of the fixing groove. The surface of the sliding rod is slidably connected with the inner walls of the two limiting rings I. Two limiting rings II are fixedly sleeved on the surface of the sliding rod. The inner wall of each limiting ring II is fixedly connected with the surface of the sliding rod. One of the limiting rings II is located between the two limiting rings I, and the other limiting ring II is located outside one of the limiting rings I.
[0009] Preferably, a spring I is fixedly connected to the side surface of one of the limiting rings I. The surface of the spring I is slidably connected with the surface of the sliding rod. A frustum block is arranged outside the other limiting ring I. One end of the sliding rod penetrates through the block body of the frustum block and is fixedly connected therewith. A semi-circular block is fixedly connected to one end of the sliding rod.
[0010] Preferably, the docking mechanism includes a side baffle. A "soil"-shaped movable groove is opened on one side of the side baffle. A limiting rod is slidably connected to the inner wall in the vertical direction of the movable groove. The lower end of the limiting rod is provided with an inclined surface adapted to the surface of the frustum block. A limiting ring III is fixedly connected to the inner wall of the upper end of the movable groove. The upper surface of the limiting rod is slidably connected with the inner wall of the limiting ring III. A spring II is fixedly connected to the lower surface of the limiting ring III. The surface of the spring II is slidably connected with the upper surface of the limiting rod. The lower end of the spring II is fixedly connected with the inner wall of the movable groove.
[0011] Preferably, the outer side surface of the side baffle is symmetrically provided with slots matched with the surface of the limit frame along the central axis, and notches matched with the limit block are provided on both sides of the upper end of the side baffle.
[0012] Preferably, the reinforcement mechanism includes a limit plate fixed in an array on the outer surface of the cross baffle, the surface of the limit plate is threadedly connected with a triangular block by bolts, the surface of the triangular block is provided with a limit hole, the inner wall h of the limit hole is slidably plugged with a connecting column, a double-headed threaded tube is arranged between the two connecting columns, and the inner wall of the threaded tube is threadedly connected to the end of the connecting column.
[0013] Preferably, the space formed by the two transverse baffles and the two side baffles is filled with rock wool.
[0014] Preferably, the outer surface of the transverse baffle is provided with an aluminum plate adapted thereto, and the outer surface of the aluminum plate is coated with a polyurethane waterproof and breathable coating.
[0015] Preferably, a heat insulating pad is provided between the transverse baffle and the aluminum plate, and the heat insulating pad is made of rubber with a thickness of 3-5 mm.
[0016] Preferably, a sealing strip is provided in the connection gap between the cross member and the docking mechanism.
[0017] The beneficial effects of the present invention are:
[0018] By setting up a fixing mechanism, the installation and disassembly between the cross baffle and the side baffle are facilitated. The two can be fixed by simply aligning the semicircular block with the movable groove and allowing the two to slowly and completely contact. Then the limiting effect between the limit rod and the semicircular block can be released by pushing the push rod. The design of the fixing mechanism makes the installation process intuitive and simple, and does not require construction workers to have advanced professional skills or rich experience. At the same time, during batch installation, construction workers can complete the connection between the cross baffle and the side baffle more efficiently, reducing time waste and manpower consumption caused by the complexity of the installation process, improving overall construction efficiency, and reducing construction costs.
[0019] By setting aluminum plates, rock wool and sealing strips, the aluminum plate itself has certain thermal insulation properties. As the outer layer material of the wall, it can block the transfer of heat to a certain extent. The rock wool is filled inside the wall. With its excellent thermal insulation performance, it effectively reduces the exchange of indoor and outdoor heat. The combination of the two forms an internal and external double insulation screen. At the same time, the sealing strip is set in the connecting gap between the cross bar mechanism and the docking mechanism, which effectively prevents the flow of air in these gaps. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 A schematic diagram of a high-stability steel structure thermal insulation wall proposed by the present invention;
[0021] Figure 2 A cross-sectional view of a side baffle of a high-stability steel structure thermal insulation wall proposed by the present invention;
[0022] Figure 3 A slide groove position diagram of a high-stability steel structure insulation wall proposed by the present invention;
[0023] Figure 4 A diagram showing the position of a fixing mechanism for a high-stability steel structure thermal insulation wall proposed by the present invention;
[0024] Figure 5 A high-stability steel structure thermal insulation wall proposed by the present invention Figure 4 The enlarged view of point A in the middle;
[0025] Figure 6 A diagram showing the position of support rods for a high-stability steel structure thermal insulation wall proposed by the present invention;
[0026] Figure 7 A bottom view of a transverse baffle of a high-stability steel structure thermal insulation wall proposed by the present invention;
[0027] Figure 8 A three-dimensional diagram of a triangular block of a high-stability steel structure thermal insulation wall proposed by the present invention;
[0028] Fig. 9 A three-dimensional diagram of the support rods of a high-stability steel structure thermal insulation wall proposed by the present invention.
[0029] In the figure: 1. cross bar mechanism; 11. cross baffle plate; 12. mounting groove; 13. limit block; 14. limit column; 15. threaded hole; 16. bolt; 17. slide groove; 18. fixing groove; 19. fixing mechanism; 190. push rod; 191. limit ring I; 192. limit ring II; 193. slide rod; 194. prism block; 195. semicircular block; 196. limit ring III; 197. spring II; 198. limit rod; 110. limit frame; 2. docking mechanism; 21. side baffle plate; 22. notch; 23. card slot; 24. movable groove; 3. support rod; 4. reinforcement mechanism; 41. limit plate; 42. triangle block; 43. connecting column; 44. threaded pipe. DETAILED DESCRIPTION
[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.
[0031] Reference Figure 1-Figure 9A high-stability steel structure insulation wall, comprising a symmetrically arranged crossbar mechanism 1, a docking mechanism 2 is arranged at one end of the crossbar mechanism 1, a plurality of support rods 3 are arranged between the two crossbar mechanisms 1, and a reinforcement mechanism 4 is arranged in an array on the outer side of each crossbar mechanism 1, and the crossbar mechanism 1 comprises a cross baffle 11, and mounting grooves 12 are arranged on both sides of the upper end of the cross baffle 11, and the groove wall of the mounting groove 12 is threadedly connected to a limiting block 13, and a limiting column 14 is arranged in an array on the upper end of the cross baffle 11, and a limiting column 14 is arranged at the lower end of the cross baffle 11. A plurality of threaded holes 15 are arranged in an array at the upper end of the cross baffle 11, and a bolt 16 is threadedly connected to the inner wall of each threaded hole 15. A slide groove 17 is arranged on a long side of the cross baffle 11, and the inner wall of the lower end of the threaded hole 15 is communicated with the inner wall of the slide groove 17. Both ends of the support rod 3 are arranged in a spherical shape, and the inner wall of the slide groove 17 is adapted to the two ends of the support rod 3. A fixing groove 18 is arranged on the other long side of the cross baffle 11, and a fixing mechanism 19 is arranged inside the fixing groove 18. A limiting frame 110 is arranged in an array on the short side of the cross baffle 11.
[0032] In this embodiment, the fixing mechanism 19 includes a push rod 190 slidably connected to the inner wall of the fixing groove 18, one end of the push rod 190 is fixedly connected to a slide rod 193, the inner wall of the fixing groove 18 is provided with two limit rings I191, the outer side surface of the limit ring I191 is fixedly connected to the inner wall of the fixing groove 18, the surface of the slide rod 193 is slidably connected to the inner walls of the two limit rings I191, and the surface of the slide rod 193 is fixedly sleeved with two limit rings II192, the inner wall of each limit ring II192 is fixedly connected to the surface of the slide rod 193, one of the limit rings II192 is located between the two limit rings I191, and the other limit ring II192 is located on the outside of one of the limit rings I191; a spring I is fixedly connected to the side of one of the limit rings I191, the surface of the spring I is slidably connected to the surface of the slide rod 193, and the other limit ring I A prism block 194 is arranged on the outer side of 191, one end of the slide rod 193 passes through the block body of the prism block 194 and is fixedly connected thereto, and one end of the slide rod 193 is fixedly connected thereto with a semicircular block 195; the docking mechanism 2 comprises a side baffle plate 21, and a "earth"-shaped movable groove 24 is opened on one side of the side baffle plate 21, and a limiting rod 198 is slidably connected to the inner wall of the movable groove 24 in the vertical direction, and the lower end of the limiting rod 198 is arranged to be an inclined surface adapted to the surface of the prism block 194, and a limiting ring III196 is fixedly connected to the inner wall of the upper end of the movable groove 24, and the upper end surface of the limiting rod 198 is slidably connected to the inner wall of the limiting ring III196, and a spring II197 is fixedly connected to the lower surface of the limiting ring III196, and the surface of the spring II197 is slidably connected to the upper end surface of the limiting rod 198, and the lower end of the spring II197 is fixedly connected to the inner wall of the movable groove 24.
[0033] Specifically, by contacting the cross baffle 11 with the side baffle 21, the semicircular block 195 enters the movable groove 24 and the surface of the semicircular block 195 squeezes the lower end of the limit rod 198, so that the limit rod 198 moves upward until the cross baffle 11 and the side baffle 21 cannot be directly separated. The above-mentioned structural construction personnel only need to push the cross baffle 11 toward the side baffle 21 to complete the connection by relying on the mechanical action between the components, which greatly improves the installation efficiency. Especially in the large-scale wall assembly process, a lot of time and labor costs can be saved. Once installed in place, the cross baffle 11 and the side baffle 21 cannot be directly separated. This automatic locking forms a stable connection state. Compared with the traditional connection method, it reduces the risk of structural loosening due to loose connection, and ensures the integrity and structural strength of the wall during use.
[0034] In this embodiment, the outer side surface of the side baffle 21 is symmetrically provided with a slot 23 adapted to the surface of the limit frame 110 along the central axis, and the two sides of the upper end of the side baffle 21 are provided with a notch 22 adapted to the limit block 13;
[0035] Specifically, the arrangement of the card slot 23 facilitates the connection between the side baffle 21 and the limit frame 110, and the arrangement of the notch 22 enables the L-shaped limit block 13 to form a limit effect on the side baffle 21 after rotation. The combination of the card slot 23 and the limit frame 110 provides a fixing effect on the side baffle 21 in the vertical direction.
[0036] In this embodiment, the reinforcement mechanism 4 includes a limit plate 41 fixed in an array on the outer surface of the cross baffle 11. The surface of the limit plate 41 is threadedly connected to a triangular block 42 by bolts. A limit hole is opened on the surface of the triangular block 42. The inner wall of the limit hole is fixedly connected to a connecting column 43. A double-headed threaded tube 44 is arranged between the two connecting columns 43. The inner wall of the threaded tube 44 is threadedly connected to the end of the connecting column 43.
[0037] Specifically, during the use of the wall, factors such as temperature changes, material aging or foundation settlement may cause the wall to deform to a certain extent. The adjustable characteristics of the reinforcement mechanism 4 can adapt to this deformation to a certain extent. When the wall is slightly deformed, the stress distribution inside the reinforcement mechanism 4 can be rebalanced by adjusting the double-headed threaded tube 44 to maintain effective support for the cross baffle 11 and ensure the stability of the wall.
[0038] In this embodiment, the space formed by the two transverse baffles 11 and the two side baffles 21 is filled with rock wool.
[0039] Specifically, in the insulated walls of steel structures, rock wool can greatly reduce the exchange of indoor and outdoor heat, and can play a significant role in preventing indoor heat loss in the cold winter and preventing outdoor heat from entering the room in the hot summer. In addition, walls filled with rock wool can effectively reduce the transmission of external noise into the room, thereby improving the quality of the indoor acoustic environment.
[0040] In this embodiment, the outer surface of the transverse baffle 11 is provided with an aluminum plate adapted thereto, and the outer surface of the aluminum plate is coated with a polyurethane waterproof and breathable coating.
[0041] Specifically, the aluminum plate serves as the outer layer protection of the cross baffle 11, which can effectively prevent the erosion of the cross baffle 11 by moisture, oxygen, acid and alkali substances in the external environment. The aluminum plate has a certain strength and hardness and can withstand a certain degree of external force impact, which helps to protect the internal insulation material and steel structure from damage and maintain the integrity and function of the wall; the polyurethane waterproof and breathable coating forms a continuous waterproof layer on the surface of the aluminum plate, which can effectively prevent liquid water such as rain, snow, and dew from penetrating into the wall from the outside.
[0042] In this embodiment, a heat insulating pad is provided between the transverse baffle 11 and the aluminum plate. The heat insulating pad is made of rubber and has a thickness of 3-5 mm.
[0043] Specifically, a rubber heat-insulating pad is provided between the cross baffle 11 and the aluminum plate, which can effectively reduce the heat transfer between the two. The rubber heat-insulating pad has good elasticity and buffering properties, can absorb and disperse these impact forces, and protect the aluminum plate and the cross baffle 11 from damage.
[0044] In this embodiment, a sealing strip is provided in the connection gap between the cross member 1 and the docking member 2 .
[0045] Specifically, the sealing strip can effectively prevent rainwater from entering the wall through the connection gap between the cross member 1 and the docking member 2, and can also prevent moisture in the air from entering the connection gap. The sealing strip can fill these gaps, reduce the transfer of heat through the connection parts, and make the thermal insulation performance of the wall more uniform and efficient.
[0046] Reference Figure 1-Figure 9 , a method for installing a high-stability steel structure insulation wall, the specific steps are as follows:
[0047] Step 1: First, fix multiple triangular blocks 42 to the limit plate 41 through bolts. After the fixation is completed, slowly move a transverse baffle 11 and a side baffle 21 closer together through the equipment until the semicircular block 195 enters the movable groove 24 and the surface of the semicircular block 195 squeezes the lower end of the limit rod 198, so that the limit rod 198 moves upward until the transverse baffle 11 and the side baffle 21 cannot be directly separated;
[0048] Step 2, then fix another transverse baffle 11 and the installed side baffle 21 with the side baffle 21 using the installation method in step 1, then move another side baffle 21 close to the two transverse baffles 11 until the slot 23 is hooked with the limit frame 110, then rotate the limit block 13 to contact the notch 22 at the upper end of the side baffle 21, and finally slide the support rod 3 along the slide groove 17, and fix the support rod 3 in the slide groove 17 with the bolt 16, until multiple support rods 3 are alternately fixed in the slide groove 17 in a "V" shape, and the installation of a single wall is completed;
[0049] Step 3: Continue to install the cross baffle 11 with the triangular block 42 fixed on the outer surface by bolts in the vertical direction, the limiting hole set at the lower end of the cross baffle 11 is plugged into the limiting column 14 at the upper end of the installed cross baffle 11, and horizontally, the side baffle 21 used in step 1 is fixed to the cross baffle 11 by the fixing mechanism 19, and then perform step 2;
[0050] Step 4. After the wall is installed, insert the connecting column 43 into the limiting holes of the two triangular blocks 42 on the outside of the upper cross baffle 11 and the lower cross baffle 11. The lower end of the connecting column 43 is fixed to the ground, and the double-headed threaded pipe 44 is sleeved on the upper end of the connecting column 43 to facilitate the subsequent fixation of the cross baffle 11. At the same time, fill the wall with rock wool, set sealing strips in the gaps between the walls, and fix an aluminum plate with a rubber insulation pad on one side on the outside of the wall.
[0051] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A highly stable steel structure thermal insulation wall, characterized by: The invention comprises a symmetrically arranged crossbar mechanism (1), one end of the crossbar mechanism (1) is provided with a docking mechanism (2), a plurality of support rods (3) are provided between two crossbar mechanisms (1), and a reinforcement mechanism (4) is arranged in an array on the outer side surface of each crossbar mechanism (1), the crossbar mechanism (1) comprises a cross baffle (11), both sides of the upper end of the cross baffle (11) are provided with mounting grooves (12), the groove walls of the mounting grooves (12) are threadedly connected to limit blocks (13), the upper ends of the cross baffles (11) are provided with limit columns (14) in an array, the lower ends of the cross baffles (11) are provided with limit holes matched with the limit columns (14), and the cross baffles (11) are provided with limit holes. The upper end array of the cross baffle (11) is provided with a plurality of threaded holes (15), the inner wall of each threaded hole (15) is threadedly connected with a bolt (16), a slide groove (17) is provided on a long side surface of the cross baffle (11), the lower inner wall of the threaded hole (15) is communicated with the inner wall of the slide groove (17), the two ends of the support rod (3) are arranged in a spherical shape, the inner wall of the slide groove (17) is adapted to the two ends of the support rod (3), the other long side surface of the cross baffle (11) is provided with a fixing groove (18), the interior of the fixing groove (18) is provided with a fixing mechanism (19), and a limiting frame (110) is provided on the short side array of the cross baffle (11); The reinforcing mechanism (4) comprises a limit plate (41) fixed in an array on the outer surface of the transverse baffle (11); the surface of the limit plate (41) is threadedly connected to a triangular block (42) via a bolt; a limit hole is provided on the surface of the triangular block (42); a connecting column (43) is slidably inserted into the inner wall of the limit hole; a double-headed threaded tube (44) is provided between two connecting columns (43); the inner wall of the threaded tube (44) is threadedly connected to the end of the connecting column (43); The fixing mechanism (19) comprises a push rod (190) slidably connected to the inner wall of the fixing groove (18), one end of the push rod (190) is fixedly connected to a slide rod (193), the inner wall of the fixing groove (18) is provided with two limit rings I (191), the outer side surface of the limit ring I (191) is fixedly connected to the inner wall of the fixing groove (18), the surface of the slide rod (193) is slidably connected to the inner walls of the two limit rings I (191), the surface of the slide rod (193) is fixedly sleeved with two limit rings II (192), the inner wall of each limit ring II (192) is respectively fixedly connected to the surface of the slide rod (193), one of the limit rings II (192) is located between the two limit rings I (191), and the other limit ring II (192) is located on the outer side of one of the limit rings I (191); A spring I is fixedly connected to the side surface of one of the limit rings I (191), and the surface of the spring I is slidably connected to the surface of the slide rod (193); a prism block (194) is arranged on the outer side of the other limit ring I (191); one end of the slide rod (193) passes through the block body of the prism block (194) and is fixedly connected thereto; and one end of the slide rod (193) is fixedly connected to a semicircular block (195); The docking mechanism (2) comprises a side baffle (21), one side of the side baffle (21) is provided with a "earth"-shaped movable groove (24), the inner wall of the movable groove (24) in a vertical direction is slidably connected to a limit rod (198), the lower end of the limit rod (198) is arranged as an inclined surface adapted to the surface of the prism block (194), the inner wall of the upper end of the movable groove (24) is fixedly connected to a limit ring III (196), the upper end surface of the limit rod (198) is slidably connected to the inner wall of the limit ring III (196), the lower surface of the limit ring III (196) is fixedly connected to a spring II (197), the surface of the spring II (197) is slidably connected to the upper end surface of the limit rod (198), and the lower end of the spring II (197) is fixedly connected to the inner wall of the movable groove (24).
2. The high-stability steel structure thermal insulation wall according to claim 1, characterized in that: The outer side surface of the side baffle (21) is symmetrically provided with slots (23) matching the surface of the limit frame (110) along the central axis, and notches (22) matching the limit block (13) are provided on both sides of the upper end of the side baffle (21).
3. The high-stability steel structure thermal insulation wall according to claim 2, characterized in that: The space formed by the two transverse baffles (11) and the two side baffles (21) is filled with rock wool.
4. The high-stability steel structure thermal insulation wall according to claim 3, characterized in that: The outer surface of the transverse baffle (11) is provided with an aluminum plate that matches the transverse baffle (11), and the outer surface of the aluminum plate is coated with a polyurethane waterproof and breathable coating.
5. The high-stability steel structure thermal insulation wall according to claim 4, characterized in that: A heat insulation pad is provided between the transverse baffle (11) and the aluminum plate. The heat insulation pad is made of rubber and has a thickness of 3-5 mm.
6. The high-stability steel structure thermal insulation wall according to claim 5, characterized in that: A sealing strip is provided in the connection gap between the crossbar mechanism (1) and the docking mechanism (2).
Citation Information
Patent Citations
External wall heat preservation device for green building
CN216616323U