A waste plastic sorting device and a sorting process

Abstract

The application discloses a waste plastic sorting device and sorting process, and relates to the field of garbage classification treatment.The device comprises a bearing frame, the top of the bearing frame is provided with a sorting cylinder, the side of the sorting cylinder is provided with a feeding port, a plastic bottle discharging port and a light plastic discharging air duct, the inside of the light plastic discharging air duct is provided with a first driving assembly, the inside of the sorting cylinder is rotatably connected with a first transmission shaft, one end of the first transmission shaft is connected with a third driving assembly, the outside of the first transmission shaft is provided with a feeding spiral blade, and the inside of the sorting cylinder is provided with a sorting conveying assembly and a cutting assembly.The first transmission shaft, the feeding spiral blade and the multiple sorting conveying assemblies can sort the plastic bags mixed in the plastic bottles, the plastic bottles in the waste plastic can be discharged through the plastic bottle discharging port, and the light waste plastic is taken into the position of the cutting assembly by the sorting conveying assembly and the hook claw, so that the plastic bottles and the light plastic in the waste plastic can be sorted.

Description

Technical Field

[0001] This invention relates to the field of waste sorting and treatment, specifically to a waste plastic sorting device and sorting process. Background Technology

[0002] Waste plastic refers to plastic products and waste materials that have lost their original use value or have been discarded. It is diverse and covers many fields such as daily life, industrial production, and agriculture. In waste treatment, sorting is the key link to realize plastic recycling and requires efficient separation based on physical properties and material differences.

[0003] In the waste disposal process, workers typically perform initial screening, manually removing obvious impurities (such as stones, bulky waste, batteries, and sharp metals). Then, the waste is sorted a second time according to its nature (recyclable waste, kitchen waste, hazardous waste, and other waste). Recyclable waste is further classified according to its material (such as plastic, metal, glass, and textiles). Plastic waste usually includes plastic bottles, plastic bags, or plastic films. Currently, intelligent sorting of plastic waste uses AI recognition combined with robotic arms to classify plastics of the same material (such as PET, PE, PP, and PVC). Plastic waste of the same material is then centrally crushed, recycled, and reused.

[0004] AI-based sorting combined with robotic arms offers high efficiency and accuracy. AI algorithms accurately distinguish the types of plastic waste based on their shape and color. However, this intelligent sorting method is more challenging when identifying plastic bags / films. Because plastic bags / films are lightweight, they are easily shaken by the airflow during transport on the conveyor belt, affecting the camera's shooting efficiency. Therefore, pre-sorting lightweight waste such as plastic bags before intelligent sorting can improve the efficiency of intelligent sorting. Summary of the Invention

[0005] Therefore, the purpose of this invention is to provide a waste plastic sorting device and sorting process to solve the technical problems mentioned in the background.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a waste plastic sorting device, comprising a support frame, a sorting cylinder mounted on the top of the support frame, a feed inlet, a plastic bottle discharge inlet, and a lightweight plastic discharge air duct on the side of the sorting cylinder, and a first drive assembly disposed inside the lightweight plastic discharge air duct, a first transmission shaft rotatably connected inside the sorting cylinder, a third drive assembly connected to one end of the first transmission shaft, and a feeding spiral blade sleeved on the outside of the first transmission shaft, the length of the feeding spiral blade being greater than the length of the first transmission shaft, a sorting and conveying assembly mounted inside the sorting cylinder, the sorting and conveying assembly extending into the inside of the feeding spiral blade, and multiple sets of hooks disposed on the outside of the sorting and conveying assembly, and a cutting assembly rotatably connected inside the sorting cylinder, a second transmission shaft disposed at the end of the first transmission shaft, a face gear disposed at the end of the second transmission shaft, the face gear and the sorting and conveying assembly being connected by a transmission assembly, and a second gear disposed on the outside of the second transmission shaft, the second gear being used to drive the cutting assembly to rotate.

[0007] By adopting the above technical solution, plastic bags mixed in with plastic bottles can be sorted by setting a first drive shaft, feeding spiral blades, and a multi-component sorting and conveying assembly. The feeding spiral blades are sleeved on the outside of the first drive shaft and are longer than the first drive shaft, so that there are both "overlapping sections" and "hollow sections" between the first drive shaft and the feeding spiral blades. The "overlapping section" allows the feeding spiral blades to convey waste plastics more stably (the spiral feeding space formed between the first drive shaft and the spiral blades can prevent light waste plastics, such as plastic bags, from flying). The "hollow section" is used to accommodate the multi-component sorting and conveying assembly, and a plastic bottle discharge port is set below the "hollow section". Thus, plastic bottles in the waste plastic can be discharged through the plastic bottle discharge port, while light waste plastics are brought into the position of the cutting assembly by the sorting and conveying assembly and the hook, thereby realizing the sorting of plastic bottles and light plastics in the waste plastic.

[0008] The present invention is further configured such that the portion of the feeding spiral blade longer than the first drive shaft matches the size of the plastic bottle discharge port, the sorting cylinder is provided with a partition plate for blocking the plastic bottles, and the partition plate is located between the plastic bottle discharge port and the lightweight plastic discharge duct, and a grid is provided between the plastic bottle discharge port and the lightweight plastic discharge duct.

[0009] Preferably, a partition plate can be set to block the plastic bottles, allowing them to be discharged through the plastic bottle discharge port. A grid is set between the plastic bottle discharge port and the lightweight plastic discharge duct, so that the fragmented plastic entering the plastic bottle discharge port can be adsorbed into the lightweight plastic discharge duct, thereby improving the sorting effect of plastic bottles and lightweight plastics.

[0010] The present invention is further configured such that the first driving component includes an air separator impeller and a driving device, wherein the air separator impeller rotates to generate negative pressure, which can adsorb light waste materials.

[0011] Preferably, by setting a first driving component to generate negative pressure, lighter waste plastics can be air-separated.

[0012] The present invention is further configured such that the sorting and conveying assembly is fixedly connected by a first bracket and a partition plate, and the sorting and conveying assembly is fixedly connected by a second bracket and the inner wall of the sorting cylinder. The sorting and conveying assembly is provided in multiple sets, and the multiple sets of sorting and conveying assemblies are evenly distributed, and the multiple sets of sorting and conveying assemblies all extend into the interior of the feeding spiral blades.

[0013] Preferably, the sorting and conveying assembly can be configured as a high-strength, corrosion-resistant conveying device, such as a metal toothed synchronous belt or a sprocket conveyor belt. By using the sorting and conveying assembly to drive multiple sets of hooks to reciprocate, larger lightweight waste plastics can be hooked and transferred to the position of the cutting assembly.

[0014] The present invention is further configured such that the transmission component includes a pulley assembly that is pulverizedly connected to the sorting and conveying component, the pulley assembly is pulverizedly connected to a bevel gear set, the bevel gear set is pulverizedly connected to a transmission gear, the transmission gear and the face gear mesh with each other, and a first protective plate for protecting the sorting and conveying component, the face gear and the transmission component is installed at the end of the sorting cylinder.

[0015] Preferably, a transmission assembly is provided to connect the second transmission shaft and the sorting and conveying assembly, so that the rotation of the second transmission shaft can drive the sorting and conveying assembly to run. The belt pulley assembly, bevel gear set and transmission teeth of the transmission assembly are mounted on the side of the sorting cylinder by a mounting bracket.

[0016] The present invention is further configured such that the cutting assembly includes a fixed rod rotatably connected to the inner wall of the sorting cylinder, a plurality of cutting blades are spirally distributed on the outside of the fixed rod, and a first gear is installed on the outside of the fixed rod, the first gear and the second gear mesh with each other, and a second protective plate for protecting the second gear and the first gear is installed inside the sorting cylinder.

[0017] Preferably, by setting up multiple sets of cutting components and using the second drive shaft to drive them to rotate rapidly, larger lightweight waste can be divided and crushed, so as to better collect large-volume lightweight waste and improve the subsequent crushing effect.

[0018] The present invention is further configured such that multiple sets of the cutting components are distributed among multiple sets of sorting and conveying components, and the multiple sets of cutting components are located on one side of the partition plate and above the lightweight plastic feeding duct.

[0019] Preferably, by placing multiple sets of cutting components between multiple sets of sorting and conveying components, the cutting effect of the cutting components on large-volume lightweight waste can be improved.

[0020] The present invention is further configured such that an extension cylinder is provided on the side of the sorting cylinder, a first toothed disc is rotatably connected to the outside of the extension cylinder, a second toothed disc is provided on the side of the first toothed disc, a second driving component for driving the first toothed disc to rotate is provided on the top of the support frame, a crushed material discharge port is provided at the bottom of the sorting cylinder, and multiple sets of spiral roller brushes are rotatably connected inside the crushed material discharge port, and spur gears are installed at the ends of the multiple sets of spiral roller brushes, and the multiple sets of spur gears mesh with the second toothed disc.

[0021] Preferably, the transmission direction of the multiple sets of spiral roller brushes is the same as the direction of travel of the waste. Thus, the spiral roller brushes can not only be used to transport waste plastics, but also to scrape off impurities / oil stains attached to the outer wall of plastic bottles. Moreover, the multiple sets of spiral roller brushes are densely arranged, and the gaps between them do not affect the falling of dust, gravel and other garbage.

[0022] A waste plastic sorting process includes the following steps:

[0023] S1: Start the third drive assembly, the second drive assembly and the first drive assembly to drive the first transmission shaft to rotate. First, the staff put the waste plastic into the sorting cylinder through the feed port.

[0024] S2: The feeding spiral blades rotate to feed the waste plastic. Dust and impurities in the waste plastic are discharged from the crushed material discharge port through the gaps between multiple sets of spiral roller brushes. The rotating spiral roller brushes scrape the impurities / oil on the outside of the plastic bottle, playing a preliminary dry cleaning role.

[0025] S3: When the waste plastic moves to the plastic bottle discharge port, the plastic bottles and fragmented lightweight plastics in the waste plastic are discharged from the plastic bottle discharge port together. The negative pressure generated by the working of the air classifier impeller draws the fragmented lightweight plastics discharged from the plastic bottle discharge port into the lightweight plastic discharge duct through the grid.

[0026] S4: Subsequently, some larger lightweight plastics in the waste plastics, such as plastic bags, are hooked by the hooks on the outside of the sorting and conveying components and enter between multiple sets of cutting components. The multiple sets of cutting components rotate to clean and cut the plastic bags, turning them into fragmented lightweight plastics, which are then adsorbed into the lightweight plastic feeding duct by the negative pressure generated by the working of the air classifier impeller.

[0027] In summary, the present invention has the following main beneficial effects:

[0028] 1. This invention, by setting a first drive shaft, feeding spiral blades, and a multi-component sorting and conveying assembly, can sort plastic bags mixed with plastic bottles. The feeding spiral blades are sleeved on the outside of the first drive shaft and are longer than the first drive shaft, so that there are both "overlapping sections" and "hollow sections" between the first drive shaft and the feeding spiral blades. The "overlapping section" allows the feeding spiral blades to transport waste plastics more stably (the spiral feeding space formed between the first drive shaft and the spiral blades can prevent lightweight waste plastics, such as plastic bags, from flying). The "hollow section" is used to accommodate the multi-component sorting and conveying assembly, and a plastic bottle discharge port is set below the "hollow section". Thus, plastic bottles in the waste plastic can be discharged through the plastic bottle discharge port, while lightweight waste plastics are brought to the location of the cutting assembly by the sorting and conveying assembly and the hook, thereby realizing the sorting of plastic bottles and lightweight plastics in the waste plastic.

[0029] 2. This invention opens a scrap material discharge port at the bottom of the sorting cylinder, which allows impurities and dust in waste plastics to be separated in a timely manner. The scrap material discharge port is equipped with multiple sets of dense spiral roller brushes flush with the inner wall of the sorting cylinder. This ensures that small particles of scrap material can be discharged smoothly. At the same time, the rotation of the spiral roller brushes can scrape and dry clean the plastic bottles, removing impurities and oil stains attached to the plastic bottles, making the subsequent cleaning process of the plastic bottles more efficient. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the present invention;

[0031] Figure 2 This is a schematic diagram showing the distribution of the feed inlet, plastic bottle discharge port, lightweight plastic discharge air duct, and scrap material discharge port of the present invention.

[0032] Figure 3 This is a schematic diagram of the internal structure of the sorting cylinder of the present invention;

[0033] Figure 4 This is a schematic diagram showing the distribution of the first drive shaft, feeding spiral blades, second drive shaft, sorting and conveying device, plastic bottle discharge port, and lightweight plastic discharge air duct of the present invention.

[0034] Figure 5 This is a schematic diagram showing the distribution of the sorting and conveying assembly, the cutting assembly, the second drive shaft, and the second gear of the present invention.

[0035] Figure 6 This is a schematic diagram showing the distribution of the face gear and transmission components of the present invention;

[0036] Figure 7 This is a schematic diagram showing the distribution of the sorting and conveying assembly, the transmission assembly, and the face gear of the present invention;

[0037] Figure 8 This is a schematic diagram of the cutting component structure of the present invention;

[0038] Figure 9 This is a schematic diagram showing the distribution of the plastic bottle discharge port, grid, and lightweight plastic discharge duct of the present invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Support frame; 2. Sorting cylinder; 3. Feed inlet; 4. Plastic bottle discharge port; 5. Lightweight plastic discharge duct; 6. First drive assembly; 7. First transmission shaft; 8. Feeding spiral blades; 9. Second transmission shaft; 10. Sorting and conveying assembly; 11. Hook; 12. Face gear; 13. Transmission assembly; 1301. Pulley assembly; 1302. Bevel gear set; 1303. Transmission gear; 14. Cutting assembly; 1401. Fixing rod; 1402. Cutting blade; 1403. First gear; 15. Second gear; 16. Separator plate; 17. First support; 18. Second support; 19. First protective plate; 20. Second protective plate; 21. Extension cylinder; 22. First gear plate; 23. Second gear plate; 24. Crushed material discharge port; 25. Spiral roller brush; 26. Spur gear; 27. Second drive assembly; 28. Third drive assembly; 29. ​​Grating. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0042] The embodiments of the present invention will now be described.

[0043] Please see Figures 1-9A waste plastic sorting device includes a support frame 1, a sorting cylinder 2 mounted on top of the support frame 1, and a feed inlet 3, a plastic bottle discharge inlet 4, and a lightweight plastic discharge duct 5 on the side of the sorting cylinder 2. The feed inlet 3 is used to feed waste plastics, the plastic bottle discharge inlet 4 is used to discharge plastic bottles, such as beverage bottles and condiment bottles, etc., and the lightweight plastic discharge duct 5 is used to discharge lightweight plastic bags, plastic labels, plastic films, etc. A first drive assembly 6 is installed inside the lightweight plastic discharge duct 5. A first transmission shaft 7 is rotatably connected inside the sorting cylinder 2. One end of the first transmission shaft 7 is connected to a third drive assembly 28, and a feeding spiral blade 8 is sleeved on the outside of the first transmission shaft 7. The length of the feeding spiral blade 8 is greater than the length of the first transmission shaft 7. The screw feeder 8 and the first drive shaft 7 are installed to form a spiral feeding space with a width of about 40cm and a height of about 30cm, which can accommodate most of the plastic bottles in household waste. The sorting cylinder 2 is equipped with a sorting and conveying assembly 10, which extends into the interior of the feeding screw blade 8. The sorting and conveying assembly 10 is equipped with multiple sets of hooks 11 on its exterior. The sorting cylinder 2 is rotatably connected to a cutting assembly 14. The end of the first drive shaft 7 is equipped with a second drive shaft 9, and the end of the second drive shaft 9 is equipped with a face gear 12. The face gear 12 and the sorting and conveying assembly 10 are connected by a transmission assembly 13. The exterior of the second drive shaft 9 is equipped with a second gear 15, which is used to drive the cutting assembly 14 to rotate.

[0044] Please refer to the above embodiments for further details. Figure 3 , Figure 4 and Figure 8 The portion of the feeding spiral blade 8 that is longer than the first drive shaft 7 matches the size of the plastic bottle discharge port 4. The sorting cylinder 2 is equipped with a partition plate 16 for blocking plastic bottles. The partition plate 16 is located between the plastic bottle discharge port 4 and the lightweight plastic discharge duct 5. A grid 29 is provided between the plastic bottle discharge port 4 and the lightweight plastic discharge duct 5. By setting the partition plate 16, the plastic bottles can be blocked and discharged through the plastic bottle discharge port 4. The grid 29 located between the plastic bottle discharge port 4 and the lightweight plastic discharge duct 5 allows fragmented plastic entering the plastic bottle discharge port 4 to be adsorbed into the lightweight plastic discharge duct 5, thereby improving the sorting effect of plastic bottles and lightweight plastics.

[0045] Please refer to the above embodiments for further details. Figure 1 and Figure 2 The first drive assembly 6 includes an air classifier impeller and a drive device. The air classifier impeller rotates to generate negative pressure, which can adsorb light waste materials. By setting the first drive assembly 6 to generate negative pressure, lighter waste plastics can be air-classified.

[0046] Please refer to the above embodiments for further details. Figures 4-7The sorting and conveying assembly 10 is fixedly connected to the first bracket 17 and the partition plate 16, and the sorting and conveying assembly 10 is fixedly connected to the inner wall of the sorting cylinder 2 through the second bracket 18. The sorting and conveying assembly 10 is provided in multiple sets, and the multiple sets of sorting and conveying assemblies 10 are evenly distributed and all extend into the interior of the feeding spiral blade 8. The sorting and conveying assembly 10 can be set as a high-strength and corrosion-resistant conveying device, such as a metal false tooth synchronous belt or a sprocket conveyor belt. By using the sorting and conveying assembly 10 to drive multiple sets of hooks 11 to reciprocate, the bulky light waste plastics can be hooked and transferred to the position of the cutting assembly 14.

[0047] Please refer to the above embodiments for further details. Figure 7 The transmission assembly 13 includes a pulley assembly 1301 that is connected to the sorting and conveying assembly 10. The pulley assembly 1301 is connected to a bevel gear set 1302, and the bevel gear set 1302 is connected to a transmission gear 1303. The transmission gear 1303 and the face gear 12 mesh with each other. A first protective plate 19 for protecting the sorting and conveying assembly 10, the face gear 12 and the transmission assembly 13 is installed at the end of the sorting cylinder 2. The transmission assembly 13 is used to connect the second transmission shaft 9 and the sorting and conveying assembly 10, so that the rotation of the second transmission shaft 9 can drive the sorting and conveying assembly 10 to run. The pulley assembly 1301, the bevel gear set 1302 and the transmission gear 1303 of the transmission assembly 13 are installed on the side of the sorting cylinder 2 by a mounting bracket.

[0048] Please refer to the above embodiments for further details. Figure 8 The cutting assembly 14 includes a fixed rod 1401 rotatably connected to the inner wall of the sorting cylinder 2. Multiple sets of cutting blades 1402 are spirally distributed on the outside of the fixed rod 1401, and a first gear 1403 is installed on the outside of the fixed rod 1401. The first gear 1403 and the second gear 15 mesh with each other. A second protective plate 20 is installed inside the sorting cylinder 2 to protect the second gear 15 and the first gear 1403. By setting multiple sets of cutting assemblies 14, the second transmission shaft 9 can drive them to rotate rapidly, which can divide and crush larger light waste, so as to better collect large-volume light waste and improve the subsequent crushing effect.

[0049] Please refer to the above embodiments for further details. Figure 5 and Figure 6 Multiple sets of cutting components 14 are distributed between multiple sets of sorting and conveying components 10, and multiple sets of cutting components 14 are located on one side of the partition plate 16 and above the lightweight plastic feeding duct 5. By setting multiple sets of cutting components 14 between multiple sets of sorting and conveying components 10, the cutting effect of cutting components 14 on large-volume lightweight waste can be improved.

[0050] Please refer to the above embodiments for further details. Figure 3 and Figure 4 The sorting cylinder 2 has an extension cylinder 21 on its side, and a first toothed disc 22 is rotatably connected to the outside of the extension cylinder 21. A second toothed disc 23 is provided on the side of the first toothed disc 22. A second drive assembly 27 for driving the first toothed disc 22 to rotate is provided on the top of the support frame 1. The second drive assembly 27 consists of a rotary drive device and a transmission structure (such as a gear set that meshes with the first toothed disc 22). The bottom of the sorting cylinder 2 has a crushed material discharge port 24, and multiple sets of spiral roller brushes 25 are rotatably connected inside the crushed material discharge port 24. Each end of the multiple sets of spiral roller brushes 25 is equipped with a spur gear 26, and the multiple sets of spur gears 26 mesh with the second toothed disc 23. The transmission direction of the multiple sets of spiral roller brushes 25 is the same as the direction of travel of the waste. Therefore, the spiral roller brushes 25 can not only be used to transport waste plastics, but also to scrape the impurities / oil stains attached to the outer wall of plastic bottles. Moreover, the multiple sets of spiral roller brushes 25 are densely arranged, and the gaps between them do not affect the falling of dust, gravel and other garbage.

[0051] A waste plastic sorting process includes the following steps:

[0052] S1: Start the third drive assembly 28, the second drive assembly 27 and the first drive assembly 6 to drive the first transmission shaft 7 to rotate. First, the staff put the waste plastic into the sorting cylinder 2 through the feed port 3.

[0053] S2: The feeding spiral blade 8 rotates to feed the waste plastic. The dust and impurities in the waste plastic are discharged from the crushed material discharge port 24 through the gap between the multiple sets of spiral roller brushes 25. The multiple sets of spiral roller brushes 25 rotate to scrape the impurities / oil on the outside of the plastic bottle, which plays a preliminary dry cleaning role.

[0054] S3: When the waste plastic moves to the plastic bottle discharge port 4, the plastic bottles and fragmented lightweight plastics in the waste plastic are discharged from the plastic bottle discharge port 4 together. The negative pressure generated by the working of the air classifier impeller draws the fragmented lightweight plastics discharged from the plastic bottle discharge port 4 into the lightweight plastic discharge duct 5 through the grid 29.

[0055] S4: Subsequently, some larger lightweight plastics, such as plastic bags, in the waste plastics are hooked by the claws 11 on the outside of the sorting and conveying component 10 and enter between the multiple cutting components 14. The multiple cutting components 14 rotate to clean and cut the plastic bags, turning them into fragmented lightweight plastics, which are then adsorbed into the lightweight plastic feeding duct 5 by the negative pressure generated by the working of the air classifier impeller.

[0056] In specific operation, the present invention works as follows: the third drive assembly 28 is activated to drive the first transmission shaft 7 to rotate. The first transmission shaft 7 drives the feeding spiral blade 8 and the second transmission shaft 9 connected to it to rotate. The second transmission shaft 9 drives the face gear 12 and the second gear 15 to rotate. The face gear 12 drives the transmission gear 1303 to rotate. The transmission gear 1303 drives the pulley assembly 1301 to rotate through the bevel gear set 1302. The pulley assembly 1301 drives the sorting and conveying assembly 10 to rotate. As a result, the multiple sets of hooks 11 set outside the sorting and conveying assembly 10 operate synchronously. The second gear 15 meshes with the first gear 1403 of the cutting assembly 14 to drive the multiple sets of cutting assemblies 14 to rotate rapidly. The second drive assembly 27 is activated to drive the first gear disk 22 to rotate. The first gear disk 22 drives the second gear disk 23 to rotate synchronously. The second gear disk 23 drives the multiple sets of spiral roller brushes 25 to rotate through the spur gear 26. The first drive assembly 6 is activated. The drive device of the first drive assembly 6 works to drive the air classifier impeller to rotate and generate negative pressure.

[0057] Next, workers or a material conveying mechanism will feed waste plastics, such as plastic bottles, plastic bags, and plastic films, into the sorting cylinder 2 through the inlet 3. The feeding spiral blades 8 will rotate to feed the waste plastics. Dust and impurities in the waste plastics will be discharged from the scrap discharge port 24 through the gaps between multiple sets of spiral roller brushes 25. These can be collected using a collection frame. The rotating spiral roller brushes 25 will scrape the impurities / oil on the outside of the plastic bottles, which will serve as a preliminary dry cleaning of the plastic bottles. When the waste plastics move to the position of the plastic bottle discharge port 4, the plastic bottles and fragments of lightweight plastics in the waste plastics will be discharged from the plastic bottle discharge port 4 together. The negative pressure generated by the working of the air classifier impeller will draw the fragments of lightweight plastic discharged from the plastic bottle discharge port 4 into the lightweight plastic discharge duct 5 through the grid 29. The plastic bottles will fall and be discharged normally from the plastic bottle discharge port 4. These can also be collected using a collection frame.

[0058] When larger lightweight plastics, such as plastic bags and plastic films, come into contact with the sorting and conveying assembly 10, they are hooked by the hooks 11 on the outside of the sorting and conveying assembly 10 and sent between multiple sets of cutting assemblies 14. The multiple sets of cutting assemblies 14 rotate and use multiple sets of cutting blades 1402 to cut the plastic bags, breaking them into fragments of lightweight plastic. Then, they are again drawn into the lightweight plastic discharge duct 5 by the negative pressure generated by the working of the air classifier impeller. The lightweight plastic discharged from the lightweight plastic discharge duct 5 can be collected by tying a collection bag to the outlet of the lightweight plastic discharge duct 5.

[0059] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A waste plastic sorting device, comprising a support frame (1), characterized in that: The top of the support frame (1) is equipped with a sorting cylinder (2). The side of the sorting cylinder (2) is provided with a feed inlet (3), a plastic bottle discharge port (4), and a lightweight plastic discharge air duct (5). The lightweight plastic discharge air duct (5) is provided with a first drive assembly (6). The first drive assembly (6) includes an air classifier impeller and a drive device. The air classifier impeller rotates to generate negative pressure, which can adsorb lightweight waste. The sorting cylinder (2) is rotatably connected to a first drive shaft (7). One end of the first drive shaft (7) is connected to a third drive assembly (28). The outside of the first drive shaft (7) is fitted with a feeding spiral blade (8). The length of the plate (8) is greater than the length of the first drive shaft (7). A sorting conveyor assembly (10) is installed inside the sorting cylinder (2). The sorting conveyor assembly (10) extends into the interior of the feeding spiral blade (8). Multiple sets of hooks (11) are provided on the outside of the sorting conveyor assembly (10). A cutting assembly (14) is rotatably connected inside the sorting cylinder (2). A second drive shaft (9) is provided at the end of the first drive shaft (7). A face gear (12) is provided at the end of the second drive shaft (9). The face gear (12) and the sorting conveyor assembly (10) are connected by a transmission assembly (13). The second drive shaft (8) is connected by a transmission assembly (13). 9) is externally provided with a second gear (15), which is used to drive the cutting assembly (14) to rotate. The part of the feeding spiral blade (8) that is longer than the first transmission shaft (7) matches the size of the plastic bottle discharge port (4). The sorting cylinder (2) is internally provided with a partition plate (16) for blocking plastic bottles. The partition plate (16) is located between the plastic bottle discharge port (4) and the lightweight plastic discharge air duct (5). A grid (29) is provided between the plastic bottle discharge port (4) and the lightweight plastic discharge air duct (5). The sorting conveying assembly (10) is fixedly connected by the first bracket (17) and the partition plate (16). The conveying assembly (10) is fixedly connected to the inner wall of the sorting cylinder (2) by setting the second bracket (18). The sorting conveying assembly (10) is provided in multiple sets, and the multiple sets of sorting conveying assemblies (10) are evenly distributed. The multiple sets of sorting conveying assemblies (10) all extend into the interior of the feeding spiral blade (8). The cutting assembly (14) includes a fixed rod (1401) rotatably connected to the inner wall of the sorting cylinder (2). Multiple sets of cutting blades (1402) are spirally distributed on the outside of the fixed rod (1401), and a first gear (1403) is installed on the outside of the fixed rod (1401). The first gear (1403) and the second gear (15) mesh with each other.

2. The waste plastic sorting device according to claim 1, characterized in that: The transmission assembly (13) includes a pulley assembly (1301) that is connected to the sorting and conveying assembly (10). The pulley assembly (1301) is connected to a bevel gear set (1302). The bevel gear set (1302) is connected to a transmission gear (1303). The transmission gear (1303) and the face gear (12) mesh with each other. The end of the sorting cylinder (2) is equipped with a first protective plate (19) for protecting the sorting and conveying assembly (10), the face gear (12) and the transmission assembly (13).

3. The waste plastic sorting device according to claim 1, characterized in that: The sorting cylinder (2) is equipped with a second protective plate (20) for protecting the second gear (15) and the first gear (1403).

4. The waste plastic sorting device according to claim 1, characterized in that: Multiple sets of the cutting components (14) are distributed between multiple sets of sorting and conveying components (10), and multiple sets of cutting components (14) are located on one side of the partition plate (16) and above the lightweight plastic unloading duct (5).

5. The waste plastic sorting device according to claim 1, characterized in that: The sorting cylinder (2) has an extension cylinder (21) on its side. The extension cylinder (21) is rotatably connected to a first toothed disc (22). The first toothed disc (22) is provided with a second toothed disc (23) on its side. The top of the support frame (1) is provided with a second drive assembly (27) for driving the first toothed disc (22) to rotate. The bottom of the sorting cylinder (2) is provided with a crushed material discharge port (24). The crushed material discharge port (24) is rotatably connected to multiple sets of spiral roller brushes (25). The ends of the multiple sets of spiral roller brushes (25) are all equipped with spur gears (26). The multiple sets of spur gears (26) mesh with the second toothed disc (23).

6. A waste plastic sorting process, characterized in that... Using a waste plastic sorting device according to any one of claims 1-5, the process includes the following steps: S1: Start the third drive assembly (28), the second drive assembly (27) and the first drive assembly (6) to drive the first transmission shaft (7) to rotate. First, the staff put the waste plastic into the sorting cylinder (2) through the feed port (3); S2: The feeding spiral blades (8) rotate to feed the waste plastic. The dust and impurities in the waste plastic are discharged from the crushed material discharge port (24) through the gap between the multiple sets of spiral roller brushes (25). The multiple sets of spiral roller brushes (25) rotate to scrape the impurities or oil stains on the outside of the plastic bottle, which plays a preliminary dry cleaning role. S3: When the waste plastic moves to the plastic bottle discharge port (4), the plastic bottles and fragmented lightweight plastics in the waste plastic are discharged from the plastic bottle discharge port (4) together. The negative pressure generated by the working of the air classifier impeller is drawn into the lightweight plastic discharge duct (5) through the grid (29). S4: Subsequently, some larger lightweight plastics in the waste plastics are hooked by the claws (11) on the outside of the sorting and conveying component (10) and enter between multiple cutting components (14). The multiple cutting components (14) rotate to clean and cut the plastic bags, turning them into fragmented lightweight plastics. They are then adsorbed into the lightweight plastic feeding duct (5) by the negative pressure generated by the working of the air classifier impeller.

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