A technology for vertically transporting construction waste using elevator shafts
By setting up a construction waste transportation structure in the elevator shaft and using components such as hoists and guide rods to achieve vertical transportation of basement waste, the safety and efficiency issues of basement waste disposal are solved, and construction efficiency and safety are improved.
Patent Information
- Application Number
- CN202411507008.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2044-10-28
AI Technical Summary
In building construction, the methods of handling construction waste in basements pose potential risks to structural stability and safety. Furthermore, traditional methods are time-consuming and labor-intensive, affecting construction progress and costs.
The construction waste transportation structure utilizes the elevator shaft, including the stairwell assembly, hoist, wire rope, and mechanical speed-limiting pulley. It enables the vertical movement of the waste container and is equipped with safety limiters and guide rods to ensure stability and safety.
It improves construction efficiency, reduces manpower consumption, reduces dust, enhances transportation safety and reliability, provides multiple unloading options, and improves practicality and safety.
Smart Images

Figure CN119330190B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of building construction technology, and more specifically, it relates to a technology for vertically transporting construction waste using elevator shafts. Background Technology
[0002] In the design and construction of modern buildings, basements, as an important component, are generally incorporated into the building structure. Basements are typically enclosed spaces, and their unique location and structural characteristics present numerous challenges in the handling of construction waste. Tower cranes, due to their working range and structural limitations, cannot lift construction waste from basements. In the past, two main methods for handling basement waste were commonly used during construction: one was to leave openings in the floor slabs to hoist the waste to the upper floors; however, this method can leave quality risks, potentially affecting the structural stability and safety of the building. The other method was to utilize basement driveways for transportation, which involves transporting construction waste out via these driveways. However, this method is time-consuming and labor-intensive, increasing construction costs and impacting the construction schedule, thus lacking practicality and requiring improvement. Summary of the Invention
[0003] To address the aforementioned technical problems, this invention provides a technology for vertically transporting construction waste using elevator shafts.
[0004] A technology for vertically transporting construction waste using elevator shafts, comprising the building itself:
[0005] The building body includes a construction waste transportation structure.
[0006] The construction waste transportation structure includes a stairwell assembly, which comprises multiple main beams and secondary beams. Each main beam is horizontally arranged, and each secondary beam is vertically arranged. The inner side of the overall shape formed by the combination of each main beam and secondary beam is a grid-like hollow area. Four or more main beam pre-embedded bolts are provided between the upper end of each main beam and the building body. Crossbeams are provided on the lower end of each main beam and both ends of the secondary beam. U-bolts are provided on the side walls of each crossbeam. The bolts of each U-bolt are partially exposed outside the crossbeam and fixed to the building body with nuts. The opening direction of each U-bolt is upward. A fixed protective plate is provided at the upper end of the hollow area formed by the combination of each main beam and secondary beam.
[0007] Preferably, the upper part of the building body is provided with a lifting structure, which includes a hoist body, a mechanical speed-limiting pulley, hoist pre-embedded bolts, a winch, and anchor bolts. The hoist body is threadedly connected to the building body with the hoist pre-embedded bolts, and the winch is threadedly connected to the fixed protective plate with the anchor bolts. The hoist body is provided with a wire rope, which is compatible with the winch and the mechanical speed-limiting pulley. Each main beam body and secondary beam body, after being combined, forms a square hollow area, and the square is hinged with multiple electric protective automatic door groups through single-axis hinges. Each electric protective automatic door group is made of steel plate, and each electric protective automatic door group has a round hole at its center.
[0008] Preferably, each wire rope can slide through a circular hole, and each electric automatic protective door assembly has a two-link switch mechanism at its lower end. Each two-link switch mechanism includes a set of gears and a set of link bodies. Each link body is fixedly installed at the upper end of the gears, and the end of each link body is rotatably installed with the door body of the electric automatic protective door assembly. A trash can is provided inside the hollow area of the grid. Pull rings are fixedly installed at the four corners of the upper end of the trash can. The pull rings at the upper end of the trash can are fixedly installed with the wire ropes. The horizontal angle formed by the connection between the wire ropes and the pull rings at the upper end of the trash can is between 45° and 60°.
[0009] Preferably, the center of gravity of the steel wire rope and the garbage bin are coincident. The lower end of the garbage bin is provided with a bottom-opening door assembly. An angle limiter is provided between the bottom-opening door assembly and the garbage bin. The bottom-opening door assembly and the lower end of the garbage bin are provided with a bottom-opening door bolt. The opening of the stairwell assembly is provided with a lifting ring. A swing door is rotatably installed at the lower end of the lifting ring. Multiple wall-connecting chains are fixedly installed inside the stairwell assembly. A guide rod is fixedly installed between each wall-connecting chain. A wall-connecting chain is fixedly installed on the side wall of the garbage bin near the guide rod.
[0010] Preferably, the side wall of the trash can is provided with a guide chain, the guide chain and the wall-connecting chain are adapted to the guide rod, the surface of the guide chain is provided with a roller retainer, and multiple roller bodies are fixedly installed inside each roller retainer. Each roller body is in a surrounding state and fits against the surface of the guide rod. An electric push rod is fixedly installed inside the trash can, and the output shaft of the electric push rod faces the inside of the trash can.
[0011] Preferably, a push plate is fixedly installed on the inner wall of the trash can, the push plate is fixedly installed with the output shaft of the electric push rod, the push plate is slidably installed with the trash can, and the push plate is slidably installed with the bottom opening door assembly.
[0012] Compared with the prior art, the present invention has the following beneficial effects:
[0013] In this invention, by setting up a construction waste transportation structure, workers can operate the hoist body of the lifting structure to start it. The hoist body drives the wire rope through the winch and mechanical speed-limiting pulley to move the waste container up and down inside the stairwell assembly. Compared with transporting waste layer by layer through the basement driveway, this method can effectively improve construction efficiency. It can also be used as a small building material transportation device, reducing manpower consumption. The waste transportation is carried out in a closed space, which can reduce dust. It has promotion and application value and is quite practical.
[0014] In this invention, by setting a guide rod inside the stairwell assembly, when the operator starts the lifting mechanism to move the trash can up and down inside the stairwell assembly, the movement of the trash can will cause the rollers on the guide chain to slide on the guide rod, thereby reducing the amplitude of the trash can shaking and tilting, preventing jamming, and improving reliability.
[0015] In this invention, when the construction waste inside the trash can is not suitable for unloading through the bottom-opening door assembly, the electric push rod is activated, causing the push plate to retract. This allows the push plate to push the waste out of the trash can, thus removing most of the construction waste at once and improving its practicality.
[0016] In this invention, since the trash can is made of enclosed panels, a guide rod can be installed inside the stairwell assembly to prevent the trash can from tilting significantly during movement. At the same time, the bottom opening door assembly at the bottom of the trash can and the lifting ring and swing door at the opening of the stairwell assembly greatly facilitate the unloading of construction waste by workers, providing multiple options and improving practicality.
[0017] In this invention, a mechanical speed-limiting pulley is used as a speed-limiting device. Since the winch is equipped with safety limiters such as lifting height limiter, overload limiter, and travel limiter, it can brake in case of sudden accidents such as power outages. At the same time, it can be manually controlled to lower the garbage bin to the bottom, improving protection, avoiding accidents, and increasing safety.
[0018] In this invention, by opening a circular hole on the electric protective automatic door assembly, the movement of the trash can inside the stairwell assembly can be avoided due to the setting of the electric protective automatic door assembly. At the same time, since a distance sensor is installed on the electric protective automatic door assembly, the electric protective automatic door assembly can open automatically when the trash can moves inside the stairwell assembly onto the electric protective automatic door assembly, thus improving the ease of operation. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the planar structure of the present invention;
[0020] Figure 2 This is a plan sectional view of the building body of the present invention;
[0021] Figure 3 This is a planar sectional view of the pre-embedded bolts in the main beam of the present invention;
[0022] Figure 4 This is a schematic diagram of the main beam body structure of the present invention;
[0023] Figure 5 This is a plan view of the connection between the U-shaped bolt and the main beam body of the present invention;
[0024] Figure 6 This is a plan view of the connection between the U-bolt and the secondary beam of the present invention;
[0025] Figure 7 This is a sectional view of the stairwell assembly of the present invention;
[0026] Figure 8 This is a plan view of the trash can of the present invention;
[0027] Figure 9 This is a schematic diagram of the two-bar linkage switching mechanism of the present invention.
[0028] Figure 10 This is a plan view of the guide rod of the present invention;
[0029] Figure 11 This is a plan view of the roller body of the present invention;
[0030] Figure 12 This is a schematic diagram of the plan view of the trash can of the present invention;
[0031] Figure 13 This is a plan view of the bottom-opening bolt of the present invention;
[0032] Figure 14 This is a plan view of the hoist body of the present invention;
[0033] Figure 15 This is a planar sectional view of the trash can of the present invention.
[0034] In the diagram, the correspondence between component names and attached drawing numbers is as follows: 1. Hoist body; 2. Guide rod; 3. Main beam body; 4. Stairwell assembly; 5. Wire rope; 6. Trash can; 7. Main beam embedded bolt; 8. Secondary beam body; 9. Crossbeam; 10. U-bolt; 11. Electric protective automatic door assembly; 12. Gear; 13. Linkage body; 14. Guide chain; 15. Wall tie chain; 16. Roller body; 17. Roller retainer; 18. Lifting ring; 19. Angle limiter; 20. Bottom-opening door assembly; 21. Bottom-opening door bolt; 22. Mechanical speed-limiting pulley; 23. Hoist embedded bolt; 24. Winch; 25. Anchor bolt; 26. Fixed protective plate; 27. Building body; 28. Electric push rod; 29. Push plate. Detailed Implementation
[0035] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.
[0036] Please see Figure 1 - Figure 8 This invention provides a technology for vertically transporting construction waste using elevator shafts, including a building body 27:
[0037] The building body 27 includes a construction waste transportation structure inside;
[0038] The construction waste transportation structure includes a stairwell assembly 4, which comprises multiple main beam bodies 3 and secondary beam bodies 8. Each main beam body 3 is horizontally arranged, and each secondary beam body 8 is vertically arranged. The inner side of the overall shape formed by the combination of each main beam body 3 and secondary beam body 8 is a grid-like hollow area. Four or more main beam embedded bolts 7 are provided between the upper end of each main beam body 3 and the building body 27. Crossbeams 9 are provided on the lower end of each main beam body 3 and on both ends of the secondary beam body 8. U-bolts 10 are provided on the side wall of each crossbeam 9. The bolts of each U-bolt 10 are partially exposed outside the crossbeam 9 and fixed to the building body 27 with nuts. The opening direction of each U-bolt 10 is upward. Oriented, each main beam body 3 and secondary beam body 8 has a fixed protective plate 26 at the upper end of the hollow area of the combined shape, and a lifting structure is provided at the upper end of the building body 27. By setting up a construction waste transportation structure, the staff can operate the lifting machine body 1 of the lifting structure to start, so that the lifting machine body 1 drives the wire rope 5 through the winch 24 and the mechanical speed limiting pulley 22 to move the garbage box 6 up and down inside the stairwell assembly 4. Compared with the method of transporting garbage layer by layer through the basement driveway, it can effectively improve construction efficiency, and can also be used as a small building material transportation device to reduce manpower consumption. The garbage transportation is carried out in a closed space, which can reduce dust. It has promotion and application value and is quite practical.
[0039] The lifting structure includes a lifting machine body 1, a mechanical speed-limiting pulley 22, pre-embedded bolts 23 for the lifting machine, a winch 24, and anchor bolts 25. The pre-embedded bolts 23 are threadedly installed between the lifting machine body 1 and the building body 27. The anchor bolts 25 are threadedly installed between the winch 24 and the fixed protective plate 26. A wire rope 5 is installed on the lifting machine body 1. The wire rope 5 is compatible with the winch 24 and the mechanical speed-limiting pulley 22. By using the mechanical speed-limiting pulley 22 as a speed limiting device, and because the winch 24 is equipped with safety limiters such as lifting height limiter, overload limiter, and travel limiter, it can brake in case of power outages or other emergencies. At the same time, it can be manually controlled to lower the garbage bin 6 to the bottom, improving protection, preventing accidents, and increasing safety. In addition, a fence can be installed on the outside of the fixed protective plate 26 to further improve the protective effect.
[0040] The hollow area formed by the combination of each main beam body 3 and secondary beam body 8 is equipped with multiple electric safety automatic door assemblies 11, which are hinged by single-axis hinges. Each electric safety automatic door assembly 11 is made of steel plate and has a round hole at its center. By opening the round hole on the electric safety automatic door assembly 11, the movement of the trash can 6 inside the stairwell assembly 4 can be avoided due to the setting of the electric safety automatic door assembly 11. At the same time, since the electric safety automatic door assembly 11 is equipped with a distance sensor, when the trash can 6 moves to the electric safety automatic door assembly 11 inside the stairwell assembly 4, the electric safety automatic door assembly 11 can open automatically, improving the convenience of operation.
[0041] Each wire rope 5 can slide through the round hole. Each electric protective automatic door assembly 11 is equipped with a two-link switch mechanism at its lower end. Each two-link switch mechanism includes a set of gears 12 and a set of connecting rod bodies 13. Each connecting rod body 13 is fixedly installed at the upper end of the gear 12. The end of each connecting rod body 13 is rotatably installed with the door body of the electric protective automatic door assembly 11. A trash can 6 is provided inside the hollow area of the square. Pull rings are fixedly installed at the four corners of the upper end of the trash can 6. The pull rings at the upper end of the trash can 6 are fixedly installed with the wire rope 5. The horizontal angle formed by the connection between the wire rope 5 and the pull rings at the upper end of the trash can 6 is between 45° and 60°.
[0042] The center of gravity of the steel wire rope 5 and the garbage bin 6 are in the same state after being combined. The lower end of the garbage bin 6 is provided with a bottom opening door assembly 20. An angle limiter 19 is provided between the bottom opening door assembly 20 and the garbage bin 6. The bottom opening door bolt 21 is provided between the bottom opening door assembly 20 and the lower end of the garbage bin 6. The opening of the stairwell assembly 4 is provided with a lifting ring 18. A swing door is rotatably installed at the lower end of the lifting ring 18. The garbage bin 6 is made of enclosed panels. Because the garbage bin 6 is made of enclosed panels, the guide rod 2 is set inside the stairwell assembly 4 to prevent the garbage bin 6 from tilting too much during movement. At the same time, the bottom opening door assembly 20 is set below the garbage bin 6 and the lifting ring 18 and swing door are set at the opening of the stairwell assembly 4, which can greatly facilitate the unloading of construction waste by workers, provide multiple options, and improve practicality.
[0043] Multiple wall-connecting chains 15 are fixedly installed inside the stairwell assembly 4. A guide rod 2 is fixedly installed between each wall-connecting chain 15. A wall-connecting chain 15 is fixedly installed on the side wall of the trash can 6 near the guide rod 2. A guide chain 14 is provided on the side wall of the trash can 6. The guide chain 14 and the wall-connecting chains 15 are adapted to the guide rod 2. A roller retainer 17 is provided on the surface of the guide chain 14. Multiple roller bodies 16 are fixedly installed inside each roller retainer 17. Each roller body 16 is in a surrounding state and fits against the surface of the guide rod 2. The roller body 16 is made of polyethylene plastic pipe. By setting the guide rod 2 inside the stairwell assembly 4, when the operator operates the lifting mechanism 1 to start the lifting structure and drive the trash can 6 to move up and down inside the stairwell assembly 4, the movement of the trash can 6 will drive the roller body 16 on the guide chain 14 to slide on the guide rod 2, thereby reducing the amplitude of the trash can 6 shaking and tilting, preventing jamming, and improving reliability.
[0044] An electric push rod 28 is fixedly installed inside the garbage bin 6. The output shaft of the electric push rod 28 faces the inside of the garbage bin 6. A push plate 29 is fixedly installed on the inner wall of the garbage bin 6. The push plate 29 is fixedly installed with the output shaft of the electric push rod 28. The push plate 29 is slidably installed with the garbage bin 6 and with the bottom opening door assembly 20. When the construction waste inside the garbage bin 6 is not suitable for unloading through the bottom opening door assembly 20, the electric push rod 28 is activated, causing the electric push rod 28 to drive the push plate 29 to retract. This allows the push plate 29 to push the garbage inside the garbage bin 6 out of the garbage bin 6, thus removing most of the construction waste from the garbage bin 6 at once, improving its practicality.
[0045] Working principle:
[0046] The first step in operation is for staff to start the lifting mechanism 1, which drives the wire rope 5 through the winch 24 and mechanical speed-limiting pulley 22 to move the garbage bin 6 up and down inside the stairwell assembly 4. Simultaneously, the movement of the garbage bin 6 causes the rollers 16 on the guide chain 14 to slide on the guide rod 2. Once the garbage bin 6 reaches the garbage collection and transfer position, the lifting mechanism can be shut off. Then, staff can fill the garbage bin 6 with construction waste. After the construction waste is loaded, the operation can resume. Personnel open the electric protective automatic door assembly 11, causing the gear 12 and the connecting rod body 13 on the two-link switch mechanism of the electric protective automatic door assembly 11 to drive the electric protective automatic door assembly 11 (the electric protective automatic door assembly 11 is existing technology, mainly composed of a door body, a two-link switch mechanism, a motor, and a distance sensor) to open. Then, the lifting structure can be controlled to start again, causing the garbage bin 6 to slowly move to the discharge position below the stairwell assembly 4. Then, the staff can open the bottom door bolt 21 of the bottom door assembly 20, so that the construction waste can fall directly from below the garbage bin 6.
[0047] The second step involves installing an electric safety automatic door assembly 11 and a manual normally closed safety door inside the stairwell assembly 4 when the height of the stairwell assembly 4 exceeds two stories or ten meters. When the operator starts the hoisting machine 1, the hoisting machine 1 drives the wire rope 5 through the winch 24 and the mechanical speed-limiting pulley 22 to move the trash can 6 up and down inside the stairwell assembly 4. When the trash can 6 descends to one meter above the electric safety automatic door assembly 11, the sensor inside the electric safety automatic door assembly 11 will detect the trash can 6, causing the electric safety automatic door assembly 11 to open automatically. When the trash can 6 moves below the electric safety automatic door assembly 11, the electric safety automatic door assembly 11 will close automatically. If the trash can 6 needs to stop at the manual normally closed safety door, the operator can manually control the manual normally closed safety door to close and control the trash can 6 to stop above the manual normally closed safety door, thus providing multiple layers of protection.
[0048] Thirdly, when the construction waste inside the garbage bin 6 is not suitable for unloading through the bottom-opening door assembly 20, the staff can start the lifting mechanism 1, which drives the wire rope 5 through the winch 24 and the mechanical speed-limiting pulley 22 to move the garbage bin 6 inside the stairwell assembly 4. When the garbage bin 6 moves to about half a meter from the electric protective automatic door assembly 11, the staff can manually close the electric protective automatic door assembly 11 and reopen the lifting mechanism to move the garbage bin 6 onto the door of the electric protective automatic door assembly 11. The staff can then open the swing door of the stairwell assembly 4 and activate the electric push rod 28, which causes the push plate 29 to retract, allowing the push plate 29 to push the garbage inside the garbage bin 6 out of the garbage bin 6.
[0049] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.
Claims
1. A building waste vertical transportation structure using elevator shaft, comprising a building body (27), characterized in that: the building waste transportation structure is arranged inside the building body (27); the building waste transportation structure comprises a stair shaft assembly (4), the stair shaft assembly (4) comprises a plurality of main beam bodies (3) and secondary beam bodies (8), each of the main beam bodies (3) is arranged transversely, each of the secondary beam bodies (8) is arranged vertically, the overall shape of the combination of each of the main beam bodies (3) and the secondary beam bodies (8) has a square hollow area inside, four main beam embedded bolts (7) are arranged between the upper end of each of the main beam bodies (3) and the building body (27), a cross arm (9) is arranged on the upper end of each of the main beam bodies (3) and the two end sidewalls of the secondary beam bodies (8), a U-shaped bolt (10) is arranged on the sidewall of each of the cross arms (9), the bolt of each of the U-shaped bolts (10) is partially exposed outside the cross arm (9) and is fixed on the building body (27) by a nut, the opening direction of each of the U-shaped bolts (10) is upward, a fixed protective plate (26) is arranged on the upper end of the hollow area of the shape of the combination of each of the main beam bodies (3) and the secondary beam bodies (8), a lifting structure is arranged on the upper end of the building body (27), the lifting structure comprises a lifting machine body (1), a mechanical speed limiting pulley (22), a lifting machine embedded bolt (23), a winch (24) and a foundation bolt (25), the lifting machine embedded bolt (23) is threadedly hoisted between the lifting machine body (1) and the building body (27), the foundation bolt (25) is threadedly installed between the winch (24) and the fixed protective plate (26), a steel wire rope (5) is arranged on the lifting machine body (1), the steel wire rope (5) is matched with the winch (24) and the mechanical speed limiting pulley (22), a plurality of electric protective automatic door groups (11) are hingedly connected in the square inside of the square hollow area formed by the combination of each of the main beam bodies (3) and the secondary beam bodies (8) through a single shaft hinge, each of the electric protective automatic door groups (11) is made of a steel plate, a circular hole is arranged at the center of each of the electric protective automatic door groups (11), each of the steel wire ropes (5) can slide through the circular hole, two connecting rod switch mechanisms are arranged at the lower end of each of the electric protective automatic door groups (11), each of the two connecting rod switch mechanisms comprises a set of gears (12) and a set of connecting rod bodies (13), each of the connecting rod bodies (13) is fixedly installed on the upper end of the gear (12), the end of each of the connecting rod bodies (13) is rotatably installed with the door body of the electric protective automatic door group (11), a garbage can (6) is arranged inside the square hollow area, a pull ring is fixedly installed at the four corners of the upper end of the garbage can (6), the pull ring of the upper end of the garbage can (6) is fixedly installed with the steel wire rope (5), the horizontal included angle formed after the steel wire rope (5) is connected with the pull ring of the upper end of the garbage can (6) is between 45° and 60°.
2. A structure for vertical transportation of construction waste using elevator shafts as claimed in claim 1, wherein, The center of gravity of the steel wire rope (5) combined with the garbage can (6) is in coincidence, the lower end of the garbage can (6) is provided with a lower door opening assembly (20), an angle limiter (19) is arranged between the lower door opening assembly (20) and the garbage can (6), the lower end of the lower door opening assembly (20) and the garbage can (6) is provided with a lower door opening bolt (21), and the opening of the stair shaft assembly (4) is provided with a lifting ring (18).
3. A structure for vertical transportation of construction waste using elevator shafts as claimed in claim 2, wherein, The lower end of the lifting ring (18) is rotatably provided with a horizontally hinged door, a plurality of wall connecting chains (15) are fixedly arranged in the stair shaft assembly (4), a guide rod (2) is fixedly arranged between each wall connecting chain (15), and the wall connecting chain (15) is fixedly arranged on the side wall of the garbage can (6) near the guide rod (2).
4. A structure for vertical transportation of construction waste using elevator shafts as claimed in claim 3, wherein, A guide chain (14) is arranged on the side wall of the garbage can (6), the guide chain (14) and the wall connecting chain (15) are matched with the guide rod (2), the guide chain (14) is provided with a roller fixer (17), and a plurality of roller bodies (16) are fixedly arranged in the roller fixer (17).
5. A structure for vertical transportation of construction waste using elevator shafts as claimed in claim 4, wherein, Each roller body (16) is in surrounding state and is attached to the surface of the guide rod (2), an electric push rod (28) is fixedly arranged in the garbage can (6), and the output shaft of the electric push rod (28) is directed to the inside of the garbage can (6).
6. A structure for vertical transportation of construction waste using elevator shafts as claimed in claim 5, wherein, A push plate (29) is fixedly arranged on the inner wall of the garbage can (6), the push plate (29) is fixedly arranged on the output shaft of the electric push rod (28), the push plate (29) is slidably arranged on the garbage can (6), and the push plate (29) is slidably arranged on the lower door opening assembly (20).
Citation Information
Patent Citations
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CN113978958A
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