A density sorting processing system for multi-category mixed waste plastics

Abstract

The application discloses a density sorting processing system for multi-category mixed waste plastics, and relates to the technical field of waste plastic processing.The density sorting processing system comprises a bottom disc, a fixed column is fixedly connected to the center of the top of the bottom disc, a first cylinder, a second cylinder, a third cylinder and a fourth cylinder are arranged on the top of the bottom disc, the first cylinder, the second cylinder, the third cylinder and the fourth cylinder are arranged in a ring array shape with the center of the fixed column as the center, the first cylinder, the second cylinder, the third cylinder and the fourth cylinder are connected in series, and clean water, a salt solution, a calcium chloride solution and a zinc chloride solution are sequentially used as sorting media in the cylinders, so that the mixed waste plastic fragments can be sequentially sorted out according to the gradually increased medium density, the PP / PE fragments, the PS / ABS fragments, the PC fragments and the fragments with greater density can be sequentially sorted out, and the multi-category mixed waste plastics can be gradually divided into single categories, so that the classification recovery rate of the waste plastics and the purity of the recycled materials are improved.

Description

Technical Field

[0001] This invention relates to the field of waste plastic processing technology, specifically to a density sorting and processing system for mixed waste plastics of multiple types. Background Technology

[0002] In the process of recycling waste plastics, it is necessary to classify different types of waste plastics that are mixed together in order to obtain single-category recyclable materials that can be directly reused. Density sorting is a common method for sorting waste plastics. It takes advantage of the difference in density between different plastics. When plastic fragments are put into a liquid medium, plastic fragments with a density less than that of the medium float on the surface of the medium, while plastic fragments with a density greater than that of the medium sink to the bottom of the medium, thereby separating the floating material from the sinking material.

[0003] Existing density sorting devices typically employ large sorting tanks. The plastic fragments to be sorted are placed into the sorting tank containing a liquid medium. The buoyancy of the medium causes the plastic fragments of different densities to separate into layers. Then, the floating light plastics and the sinking heavy plastics are discharged separately through a floating scraper or overflow mechanism at one end of the sorting tank and a sinking screw conveyor at the bottom. Such devices can only separate the material into two categories, floating material and sinking material, at a time.

[0004] For mixed waste plastics such as PP, PE, PS, ABS, PC, PET, and PVC, a single float-sink separation is insufficient to separate them into their respective categories. Existing technologies typically require multiple separation devices connected in series, with separation media of appropriate density prepared outside the cylinder before each stage of separation and then injected into the separation tank. This approach has the following drawbacks: First, multi-stage separation equipment occupies a large area, resulting in high investment and operating costs. Material conveying devices are also required between each stage, making the process lengthy. Second, the separation media needs to be prepared and stored separately externally, making it inconvenient to adjust the media density and difficult to flexibly adjust the separation parameters according to the composition of the incoming material. Third, the floating material retrieval and sinking material discharge mechanisms are complex in structure and inconvenient to maintain, and the replacement and replenishment of the separation media are cumbersome. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a density sorting and processing system for mixed waste plastics of multiple categories, comprising a chassis, a fixed column fixedly connected to the center of the top of the chassis, a first cylinder, a second cylinder, a third cylinder and a fourth cylinder provided on the top of the chassis, the first cylinder, the second cylinder, the third cylinder and the fourth cylinder arranged in a circular array with the center of the fixed column as the center, three support columns fixedly connected to the bottom of each of the first cylinder, the second cylinder and the third cylinder, the bottom ends of several of the support columns fixedly connected to the top of the chassis, the bottom of the fourth cylinder fixedly connected to the top of the chassis, a first through groove opened on the front side of the first cylinder near the bottom, a second through groove opened on the rear side of the second cylinder near the center, a third through groove opened on the left side of the second cylinder near the bottom, a fourth through groove opened on the right side of the third cylinder near the center, a fifth through groove opened on the rear side of the third cylinder near the bottom, a sixth through groove opened on the front side of the fourth cylinder near the center, and a first opening opened on the top of each of the first cylinder, the second cylinder, the third cylinder and the fourth cylinder.

[0006] Preferably, a second rectangular frame is fixedly connected between the first cylinder and the second cylinder near the bottom, and the second rectangular frame is respectively connected to the first through groove and the second through groove. A first rectangular frame is fixedly connected between the second cylinder and the third cylinder near the bottom, and the first rectangular frame is respectively connected to the third through groove and the fourth through groove. A third rectangular frame is fixedly connected between the third cylinder and the fourth cylinder near the bottom, and the third rectangular frame is respectively connected to the fifth through groove and the sixth through groove.

[0007] Preferably, the second, third, and fourth cylinders are each provided with a movable cylinder at their top. A crossbar is inserted into the center of the movable cylinder on the side closest to the fixed column. The end of the crossbar away from the movable cylinder is fixedly connected to the outer edge of the fixed column. The top of each movable cylinder is provided with a second opening. The bottom of each movable cylinder is provided with a first sector-shaped groove. The inner cavity of each movable cylinder is provided with a limiting cylinder. The bottom of each limiting cylinder is provided with a second sector-shaped groove. A rotating disk is attached to the bottom of each movable cylinder. The top center of the rotating disk is rotatably inserted into the bottom center of the movable cylinder. The rotating disk is provided with a third sector-shaped groove. A rotating column is fixedly connected to the bottom of each rotating disk.

[0008] Preferably, four first threaded holes are provided on the outer edge of the movable cylinder near the top, and a cross-shaped limiting plate is attached to the top of the movable cylinder. Four second threaded holes are provided on the outer edge of the cross-shaped limiting plate. A first bolt is threaded into each of the second threaded holes, and one end of the first bolt is threaded into the adjacent first threaded hole.

[0009] Preferably, each of the crossbars is fixedly connected to a vertical plate, each of the vertical plates is provided with a third threaded hole, and each of the movable cylinders is provided with two fourth threaded holes on the side near the fixed column. Each of the third threaded holes is threaded with a second bolt, and one end of the second bolt is threaded into the adjacent fourth threaded hole.

[0010] Preferably, the inner cavities of the first, second, third, and fourth cylinders are all provided with mesh plates. A connecting rod is fixedly connected to the top of each mesh plate on the side away from the fixed post. A first bevel gear is fixedly connected to the end of each connecting rod away from the mesh plate. The side of the first bevel gear away from the connecting rod is rotatably inserted into the sidewall of the inner cavity of each of the first, second, third, and fourth cylinders. A second bevel gear is rotatably inserted to the top of each of the first, second, third, and fourth cylinders on the side away from the fixed post. The first and second bevel gears are meshed together. A third bevel gear is rotatably inserted to the top of each of the first, second, third, and fourth cylinders on the side away from the fixed post. The third and second bevel gears are meshed together. A limit rod is fixedly connected to the side of the third bevel gear away from the fixed post. A handle is fixedly connected to the end of the limit rod away from the third bevel gear.

[0011] Preferably, a first solenoid valve is installed on the first rectangular frame, the second rectangular frame, and the third rectangular frame. A through hole is opened on the side of the first cylinder, the second cylinder, the third cylinder, and the fourth cylinder away from the fixed column near the bottom. A water outlet pipe is fixedly connected in each of the through holes. A second solenoid valve is installed on each of the water outlet pipes. The bottom of the first cylinder, the second cylinder, and the third cylinder are all inclined.

[0012] Compared with the prior art, the beneficial effects of the present invention are: This invention, by setting up a first cylinder, a second cylinder, a third cylinder, and a fourth cylinder connected in series, and using water, salt solution, calcium chloride solution, and zinc chloride solution as sorting media in each cylinder in turn, enables mixed waste plastic fragments to be sorted out in sequence as the density of the medium increases, separating floating PP / PE fragments, PS / ABS fragments, PC fragments, and fragments with higher density. This allows for the step-by-step separation of multi-category mixed waste plastics into single categories, which is beneficial for improving the sorting and recycling rate of waste plastics and the purity of recycled materials. A movable cylinder, a limiting cylinder, a rotating disk, and a rotating column are installed at the top of the second, third, and fourth cylinders. Salt, calcium chloride, and zinc chloride are stored in the limiting cylinders respectively. By rotating the rotating column, the third sector groove on the rotating disk is aligned with the first sector groove at the bottom of the movable cylinder, so that the corresponding medium can be quantitatively dropped into the water inside the cylinder. There is no need to prepare and transport the sorting medium outside the cylinder. The density of the water inside the cylinder can be easily adjusted. The operation is simple and the adjustment is flexible. The handle sequentially drives the limiting rod, the third bevel gear, the second bevel gear, the first bevel gear and the connecting rod to rotate, which in turn drives the mesh plate to rotate, thus retrieval of plastic fragments floating on the water surface inside the cylinder. The structure is simple, the transmission is reliable, and it is easy for operators to manually complete the retrieval of floating materials. The bottoms of the first, second, and third cylinders are inclined, and rectangular frames and first solenoid valves are installed between each cylinder. The debris that sinks to the bottom of the cylinder can be discharged into the next cylinder along with the water through the rectangular frames. The discharge and cut-off of the sediment can be controlled by the first solenoid valve. The discharge is smooth and the control is convenient, which is conducive to the step-by-step flow of materials between the cylinders. Attached Figure Description

[0013] Figure 1 This is a perspective view of the present invention; Figure 2 This is a rear-view perspective view of the present invention; Figure 3 This is a top view of the present invention; Figure 4 This is a schematic diagram of the fixing column structure of the component of the present invention; Figure 5 This is an exploded view of the movable cylinder component of the present invention; Figure 6 This is an exploded view of the movable cylinder component of the present invention from a bottom angle; Figure 7 This is a front view of the vertical plate of the component of the present invention; Figure 8 This is a schematic diagram of the first cylindrical structure of the component of the present invention; Figure 9 This is a schematic diagram of the support column structure of the component of the present invention; Figure 10 This is a schematic diagram of the first rectangular frame structure of the component of the present invention; Figure 11 This is a partial cross-sectional schematic diagram of the first cylinder, second cylinder, and third cylinder of the present invention; Figure 12 This is a schematic diagram of the grid plate structure of the component of the present invention.

[0014] The following are the labels in the diagram: 1. Chassis; 2. Fixed column; 3. First cylinder; 4. Second cylinder; 5. Third cylinder; 6. Fourth cylinder; 7. Water outlet pipe; 8. Support column; 9. Cross bar; 10. Movable cylinder; 11. Limiting cylinder; 12. Cross limiting plate; 13. First bolt; 14. Handle; 15. Rotating disc; 16. Rotating column; 17. Vertical plate; 18. Second bolt; 19. First rectangular frame; 20. Mesh plate; 21. Connecting rod; 22. First bevel gear; 23. Second bevel gear; 24. Third bevel gear; 25. Limiting rod; 26. Second rectangular frame; 27. Third rectangular frame. Detailed Implementation

[0015] Please see Figure 1-12 This invention provides a technical solution: a density sorting and processing system for mixed waste plastics of multiple categories, comprising a chassis 1, a fixed column 2 fixedly connected to the center of the top of the chassis 1, a first cylinder 3, a second cylinder 4, a third cylinder 5, and a fourth cylinder 6 arranged in a circular array around the center of the fixed column 2, and three support columns 8 fixedly connected to the bottom of each of the first cylinder 3, second cylinder 4, and third cylinder 5, with the bottom ends of several support columns 8 fixedly connected to the top of the chassis 1, and the bottom of the fourth cylinder 6... The first cylinder 3 is fixedly connected to the top of the chassis 1. A first through groove is formed near the bottom of the front side of the first cylinder 3. A second through groove is formed near the center of the rear side of the second cylinder 4. A third through groove is formed near the bottom of the left side of the second cylinder 4. A fourth through groove is formed near the center of the right side of the third cylinder 5. A fifth through groove is formed near the bottom of the rear side of the third cylinder 5. A sixth through groove is formed near the center of the front side of the fourth cylinder 6. A first opening is formed at the top of each of the first, second, third, and fourth cylinders. The first cylinder 3 and the second cylinder 4 are fixedly connected near their bottoms. A second rectangular frame 26 is connected to the second through groove and the third through groove respectively. A first rectangular frame 19 is fixedly connected between the second cylinder 4 and the third cylinder 5 near the bottom. The first rectangular frame 19 is connected to the third through groove and the fourth through groove respectively. A third rectangular frame 27 is fixedly connected between the third cylinder 5 and the fourth cylinder 6 near the bottom. The third rectangular frame 27 is connected to the fifth through groove and the sixth through groove respectively. A movable cylinder 10 is provided at the top of the second cylinder 4, the third cylinder 5 and the fourth cylinder 6. The movable cylinder 10 is close to the bottom of the third cylinder 4. A crossbar 9 is inserted into the center of one side of each fixed column 2. The end of the crossbar 9 away from the movable cylinder 10 is fixedly connected to the outer edge of the fixed column 2. A second opening is opened at the top of each movable cylinder 10. A first sector-shaped groove is opened at the bottom of each movable cylinder 10. A limiting cylinder 11 is provided in the inner cavity of each movable cylinder 10. A second sector-shaped groove is opened at the bottom of each limiting cylinder 11. A rotating disk 15 is attached to the bottom of the movable cylinder 10. The center of the top of the rotating disk 15 is rotatably inserted into the center of the bottom of the movable cylinder 10. A third sector-shaped groove is opened on each rotating disk 15. A rotating column 16 is fixedly connected to the bottom of each rotating disk 15. Four first threaded holes are provided on the outer edge of the movable cylinder 10 near the top. A cross-shaped limiting plate 12 is attached to the top of the movable cylinder 10. Four second threaded holes are provided on the outer edge of the cross-shaped limiting plate 12. A first bolt 13 is threaded into each of the second threaded holes. One end of the first bolt 13 is threaded into the adjacent first threaded hole. A vertical plate 17 is fixedly connected to the bottom of the crossbar 9. A third threaded hole is provided on each of the vertical plates 17. Two fourth threaded holes are provided on the side of the movable cylinder 10 near the fixed column 2. A third threaded hole is provided into each of the third threaded holes. A second bolt 18 is threaded into the first cylinder 3, the second cylinder 4, the third cylinder 5, and the fourth cylinder 6. Each cylinder has a mesh plate 20 inside. A connecting rod 21 is fixedly connected to the top of each mesh plate 20 on the side away from the fixed post 2. A first bevel gear 22 is fixedly connected to the end of each connecting rod 21 away from the mesh plate 20. The side of the first bevel gear 22 away from the connecting rod 21 is rotatably inserted into the first cylinder 3, the second cylinder 4, the third cylinder 5, and the fourth cylinder 6, respectively. On the inner wall of the cylinder 6, and on the side of the top of the first cylinder 3, second cylinder 4, third cylinder 5, and fourth cylinder 6 away from the fixed post 2, a second bevel gear 23 is rotatably inserted. The first bevel gear 22 and the second bevel gear 23 are meshed with each other. On the side of the first cylinder 3, second cylinder 4, third cylinder 5, and fourth cylinder 6 away from the fixed post 2, near the top, a third bevel gear 24 is rotatably inserted. The third bevel gear 24 and the second bevel gear 23 are meshed with each other. The third bevel gear 24 is located on the side away from the fixed post 2. Each side is fixedly connected to a limiting rod 25. The end of the limiting rod 25 away from the third bevel gear 24 is fixedly connected to a handle 14. The first rectangular frame 19, the second rectangular frame 26 and the third rectangular frame 27 are all equipped with a first solenoid valve. The first cylinder 3, the second cylinder 4, the third cylinder 5 and the fourth cylinder 6 are all provided with through holes near the bottom on the side away from the fixed column 2. Water outlet pipes 7 are fixedly connected in the through holes. The water outlet pipes 7 are all equipped with second solenoid valves. The bottoms of the first cylinder 3, the second cylinder 4 and the third cylinder 5 are all inclined.

[0016] Working principle: The broken plastic fragments are placed into the first cylinder 3, which is filled with clean water. When the plastic fragments enter the first cylinder 3, the fragments of PP and PE materials will float on the water surface, while the remaining fragments will sink to the bottom of the inner cavity of the first cylinder 3. Since the bottom of the first cylinder 3 is inclined, the sunken fragments will accumulate at the second rectangular frame 26. Rotating the handle 14 at the first cylinder 3 will cause the limit rod 25 to rotate, which in turn causes the third bevel gear 24 to rotate. The third bevel gear 24 will then cause the second bevel gear 23 to rotate, which in turn causes the first bevel gear 22 to rotate. The first bevel gear 22 will then cause the mesh plate 20 to rotate via the connecting rod 21. The mesh plate 20 will then retrieve the fragments floating on the water surface inside the first cylinder 3. After the debris at the first cylinder 3 is retrieved, the first solenoid valve at the second rectangular frame 26 is opened. The debris that has sunk to the bottom of the inner cavity of the first cylinder 3 will enter the second cylinder 4 along with the water through the second rectangular frame 26. Then, the first solenoid valve at the second rectangular frame 26 is closed, and the rotating column 16 at the top of the second cylinder 4 is adjusted. The rotating column 16 drives the rotating disk 15 to rotate, rotating the third sector groove on the rotating disk 15 to the first sector groove at the bottom of the movable cylinder 10. The salt inside the limiting cylinder 11 will fall into the second cylinder 4, making the water inside the second cylinder 4 more concentrated, with a density of 1.05-1.2. After the salt and water are mixed, PS and A Fragments of BS material will float on the water surface, while the remaining fragments will sink to the bottom of the inner cavity of the second cylinder 4. Since the bottom of the second cylinder 4 is inclined, the sunken fragments will accumulate at the first rectangular frame 19. Rotating the handle 14 at the second cylinder 4 will cause the limit rod 25 to rotate, which in turn causes the third bevel gear 24 to rotate. The third bevel gear 24 will then cause the second bevel gear 23 to rotate, which in turn causes the first bevel gear 22 to rotate. The first bevel gear 22 will then cause the grid plate 20 to rotate via the connecting rod 21. The grid plate 20 will then retrieve the fragments floating on the water surface inside the second cylinder 4. After the debris at the second cylinder 4 is retrieved, the first solenoid valve at the first rectangular frame 19 is opened. The debris that has sunk to the bottom of the inner cavity of the second cylinder 4 will enter the third cylinder 5 along with the water through the first rectangular frame 19. Then, the first solenoid valve at the first rectangular frame 19 is closed, and the rotating column 16 at the top of the third cylinder 5 is adjusted. The rotating column 16 drives the rotating disk 15 to rotate, rotating the third sector groove on the rotating disk 15 to the first sector groove at the bottom of the movable cylinder 10. The calcium chloride inside the limiting cylinder 11 will fall into the third cylinder 5, making the water inside the third cylinder 5 more concentrated, with a density of 1.3-1.4. After the calcium chloride and water are mixed, P Fragments of material C will float on the water surface, while the remaining fragments will sink to the bottom of the inner cavity of the third cylinder 5. Since the bottom of the third cylinder 5 is inclined, the sunken fragments will accumulate at the third rectangular frame 27. Rotating the handle 14 at the third cylinder 5 will cause the limit rod 25 to rotate, which in turn causes the third bevel gear 24 to rotate. The third bevel gear 24 will then cause the second bevel gear 23 to rotate, which in turn causes the first bevel gear 22 to rotate. The first bevel gear 22 will then cause the grid plate 20 to rotate via the connecting rod 21. The grid plate 20 will then retrieve the fragments floating on the water surface inside the third cylinder 5. After the debris at the third cylinder 5 is retrieved, the first solenoid valve at the third rectangular frame 27 is opened. The debris that has sunk to the bottom of the inner cavity of the third cylinder 5 will enter the fourth cylinder 6 along with the water through the third rectangular frame 27. Then, the first solenoid valve at the third rectangular frame 27 is closed, and the rotating column 16 at the top of the fourth cylinder 6 is adjusted. The rotating column 16 drives the rotating disk 15 to rotate, rotating the third sector groove on the rotating disk 15 to the first sector groove at the bottom of the movable cylinder 10. The zinc chloride inside the limiting cylinder 11 will fall into the fourth cylinder 6, making the fourth cylinder 6... The water in the middle becomes concentrated, with a density of 1.5-1.6. After zinc chloride is mixed with water, the heavier fragments will float on the water surface. Rotate the handle 14 at the third cylinder 5. The handle 14 drives the limit rod 25 to rotate. The limit rod 25 drives the third bevel gear 24 to rotate. The third bevel gear 24 drives the second bevel gear 23 to rotate. The second bevel gear 23 drives the first bevel gear 22 to rotate. The first bevel gear 22 drives the grid plate 20 to rotate through the connecting rod 21. The grid plate 20 will retrieve the fragments floating on the water surface inside the fourth cylinder 6. If it is necessary to drain the water inside the first cylinder 3, the second cylinder 4, the third cylinder 5, and the fourth cylinder 6 separately, open the second solenoid valve at the water outlet pipe 7. The water inside the first cylinder 3, the second cylinder 4, the third cylinder 5, and the fourth cylinder 6 will be discharged through the water outlet pipe 7. If it is necessary to replenish the salt, calcium chloride, and zinc chloride inside the three limiting cylinders 11 separately, remove the second bolt 18 and rotate the movable cylinder 10. Rotate the movable cylinder 10 180 degrees so that the rotating disk 15 is on top and the cross limiting plate 12 is on the bottom. Remove the first bolt 13, remove the cross limiting plate 12 from the movable cylinder 10, and remove the limiting cylinder 11 from inside the movable cylinder 10, thereby replenishing the salt, calcium chloride, or zinc chloride inside the limiting cylinder 11.

Claims

1. A density sorting and processing system for mixed waste plastics of multiple categories, comprising a chassis (1), characterized in that: A fixed column (2) is fixedly connected to the center of the top of the chassis (1). The top of the chassis (1) is provided with a first cylinder (3), a second cylinder (4), a third cylinder (5), and a fourth cylinder (6). The first cylinder (3), the second cylinder (4), the third cylinder (5), and the fourth cylinder (6) are arranged in a circular array with the center of the fixed column (2) as the center. The bottom of the first cylinder (3), the second cylinder (4), and the third cylinder (5) are all fixedly connected with three support columns (8). The bottom ends of several of the support columns (8) are fixedly connected to the top of the chassis (1). The bottom of the fourth cylinder (6) is fixedly connected to the center of the chassis (1). Fixedly connected to the top of the chassis (1), the first cylinder (3) has a first through groove near the bottom on the front side, the second cylinder (4) has a second through groove near the center on the rear side, the second cylinder (4) has a third through groove near the bottom on the left side, the third cylinder (5) has a fourth through groove near the center on the right side, the third cylinder (5) has a fifth through groove near the bottom on the rear side, and the fourth cylinder (6) has a sixth through groove near the center on the front side. The first cylinder (3), the second cylinder (4), the third cylinder (5) and the fourth cylinder (6) all have a first opening at the top.

2. The density sorting and processing system for multi-category mixed waste plastics according to claim 1, characterized in that: A second rectangular frame (26) is fixedly connected between the first cylinder (3) and the second cylinder (4) near the bottom. The second rectangular frame (26) is connected to the first through groove and the second through groove respectively. A first rectangular frame (19) is fixedly connected between the second cylinder (4) and the third cylinder (5) near the bottom. The first rectangular frame (19) is connected to the third through groove and the fourth through groove respectively. A third rectangular frame (27) is fixedly connected between the third cylinder (5) and the fourth cylinder (6) near the bottom. The third rectangular frame (27) is connected to the fifth through groove and the sixth through groove respectively.

3. The density sorting and processing system for multi-category mixed waste plastics according to claim 1, characterized in that: The second cylinder (4), the third cylinder (5) and the fourth cylinder (6) are all provided with a movable cylinder (10) at the top. A crossbar (9) is inserted into the center of the movable cylinder (10) near the fixed column (2). The end of the crossbar (9) away from the movable cylinder (10) is fixedly connected to the outer edge of the fixed column (2). The top of the movable cylinder (10) is provided with a second opening. The bottom of the movable cylinder (10) is provided with a first sector groove. The inner cavity of the movable cylinder (10) is provided with a limiting cylinder (11). The bottom of the limiting cylinder (11) is provided with a second sector groove. The bottom of the movable cylinder (10) is fitted with a rotating disk (15). The center of the top of the rotating disk (15) is rotatably inserted into the center of the bottom of the movable cylinder (10). The rotating disk (15) is provided with a third sector groove. The bottom of the rotating disk (15) is fixedly connected with a rotating column (16).

4. The density sorting and processing system for multi-category mixed waste plastics according to claim 3, characterized in that: The movable cylinder (10) has four first threaded holes near the top of its outer edge. The top of the movable cylinder (10) is fitted with a cross-shaped limiting plate (12). The outer edge of the cross-shaped limiting plate (12) has four second threaded holes. Each of the second threaded holes is threaded with a first bolt (13). One end of the first bolt (13) is threaded into an adjacent first threaded hole.

5. The density sorting and processing system for multi-category mixed waste plastics according to claim 4, characterized in that: The bottom of each crossbar (9) is fixedly connected to a vertical plate (17), and each vertical plate (17) has a third threaded hole. Each movable cylinder (10) has two fourth threaded holes on the side near the fixed column (2). Each third threaded hole is threaded with a second bolt (18), and one end of the second bolt (18) is threaded into the adjacent fourth threaded hole.

6. The density sorting and processing system for multi-category mixed waste plastics according to claim 1, characterized in that: The inner cavities of the first cylinder (3), the second cylinder (4), the third cylinder (5), and the fourth cylinder (6) are all provided with grid plates (20). A connecting rod (21) is fixedly connected to the top of each grid plate (20) on the side away from the fixed column (2). A first bevel gear (22) is fixedly connected to the end of each connecting rod (21) away from the grid plate (20). The side of the first bevel gear (22) away from the connecting rod (21) is rotatably inserted into the inner wall of the first cylinder (3), the second cylinder (4), the third cylinder (5), and the fourth cylinder (6). The tops of the first cylinder (3), the second cylinder (4), the third cylinder (5), and the fourth cylinder (6) are far from the grid plate (20). A second bevel gear (23) is rotatably inserted on one side of the fixed column (2). The first bevel gear (22) and the second bevel gear (23) are meshed with each other. A third bevel gear (24) is rotatably inserted near the top on the side of the first cylinder (3), the second cylinder (4), the third cylinder (5), and the fourth cylinder (6) away from the fixed column (2). The third bevel gear (24) and the second bevel gear (23) are meshed with each other. A limit rod (25) is fixedly connected to the side of the third bevel gear (24) away from the fixed column (2). A handle (14) is fixedly connected to the end of the limit rod (25) away from the third bevel gear (24).

7. The density sorting and processing system for multi-category mixed waste plastics according to claim 2, characterized in that: A first solenoid valve is installed on the first rectangular frame (19), the second rectangular frame (26) and the third rectangular frame (27). A through hole is opened on the side of the first cylinder (3), the second cylinder (4), the third cylinder (5) and the fourth cylinder (6) away from the fixed column (2) near the bottom. A water outlet pipe (7) is fixedly connected in the through hole. A second solenoid valve is installed on the water outlet pipe (7). The bottom of the first cylinder (3), the second cylinder (4) and the third cylinder (5) are all inclined.

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