A marine plastic waste recycling device

Abstract

This invention relates to the field of plastic solid waste treatment technology, and provides a marine plastic waste recycling and treatment device, including a water tank, a lower separation tank, an upper separation tank, and a crushing cylinder. The lower separation tank is fixedly installed on top of the water tank, the upper separation tank is fixedly installed on top of the lower separation tank, and the crushing cylinder is fixedly installed on top of the upper separation tank. The water tank, lower separation tank, upper separation tank, and crushing cylinder are sequentially connected. A feed hopper is fixedly installed on top of the crushing cylinder. The marine plastic waste recycling and treatment device provided by this solution adopts an integrated vertical layout, compressing the five major processes of crushing, washing, screening, filtration, and water return into the same three-dimensional space. This significantly reduces the risk of leakage of plastic fragments and microplastics, effectively completing crushing and washing within a single device. It can also separate large and small plastics, facilitating centralized processing, improving the recycling rate, and reducing secondary pollution.

Description

Technical Field

[0001] This invention belongs to the field of plastic solid waste treatment technology, and particularly relates to a marine plastic waste recycling and treatment device. Background Technology

[0002] Currently, there is a large amount of plastic waste in the ocean, forming large floating objects such as the "Pacific Garbage Patch." This waste breaks down into microplastics under the influence of wind, waves, and ultraviolet light. These microplastics are then ingested by marine life and enter the food chain, posing a long-term threat to ecosystems and human health. This is because plastics have a wide density range (0.9–1.4 g / cm³). 3 Furthermore, these materials are often entangled with impurities such as seaweed, shells, and silt. The traditional open post-processing methods of "fishing-transporting-burying" or "fishing-transporting-incinerating" have drawbacks such as low recovery rates, high secondary pollution, and high transportation costs, and can no longer meet the needs of nearshore and offshore operations.

[0003] Currently, the common practice for recycling biodegradable plastics involves feeding the plastics into a crushing chamber for crushing, then cleaning the crushed plastics and melting them down into new shapes. However, since crushing and cleaning are performed in separate devices, this process presents inconveniences. Furthermore, after crushing, different types of plastics are broken down into different sizes. If these smaller plastics are not separated, a significant amount will still be lost during transportation and disposal, resulting in low recycling rates and secondary pollution. Summary of the Invention

[0004] This invention provides a marine plastic waste recycling and processing device, which aims to solve the problems mentioned in the background art.

[0005] To solve the above problems, the present invention provides a marine plastic waste recycling and processing device, comprising: a water tank, a lower separation tank, an upper separation tank, and a crushing cylinder. The lower separation tank is fixedly installed on top of the water tank, the upper separation tank is fixedly installed on top of the lower separation tank, and the crushing cylinder is fixedly installed on top of the upper separation tank. The water tank, lower separation tank, upper separation tank, and crushing cylinder are sequentially connected. A feed hopper is fixedly installed on the top of the crushing cylinder for introducing waste into the crushing cylinder. A crushing mechanism is provided inside the crushing cylinder for crushing the waste. A connecting cylinder is fixedly installed between the bottom of the crushing cylinder and the top of the upper separation tank for introducing the crushed material in the crushing cylinder into the upper separation tank for separation. A sprayer is installed on the top of the upper separation tank. The upper and lower separation boxes are equipped with a mesh conveyor belt for spraying and cleaning the crushed waste entering the upper separation box. The spraying mechanism is located on one side of the connecting cylinder. The upper and lower separation boxes are equipped with a mesh conveyor belt for receiving and separating the material entering the upper separation box. The waste is discharged from the upper separation box, and the screened material carrying water and impurities falls into the lower separation box, allowing the water to flow back into the water tank. The upper separation box has a solid discharge port on one side, and a solid guide plate is fixedly installed at the solid discharge port. The receiving end of the solid guide plate overlaps with the discharge side of the mesh conveyor belt, and the discharge end extends to the outside of the upper separation box through the solid discharge port. The lower separation box has a pull-out mesh receiving drawer on one side, which is located below the mesh conveyor belt and is used to receive impurities and water for separation, allowing the water to flow back into the water tank.

[0006] Preferably, the spraying mechanism includes a hollow water-spraying plate, which is fixedly installed on the top of the upper separation box. The top of the upper separation box has an installation opening corresponding to the hollow water-spraying plate. Multiple nozzles are fixedly installed on the bottom of the hollow water-spraying plate, all of which are located inside the installation opening and correspond to the mesh conveyor belt below, for spraying and cleaning the transported waste. A water pump is installed in the water tank, and a water inlet pipe is installed at the drain end of the water pump. The drain end of the water inlet pipe is connected to the hollow water-spraying plate for supplying water.

[0007] Preferably, a water distribution ring is fixedly fitted on the outside of the feed hopper, a water distribution pipe is fixedly installed on the water supply pipe, a valve is provided on the water distribution pipe, the drain end of the water distribution pipe is connected to the water distribution ring for supplying water to the water distribution ring, and multiple drain holes are evenly arranged in a ring array on the inner wall of the feed hopper. All of the multiple drain holes are connected to the water distribution ring for spraying water on the waste entering the feed hopper.

[0008] Preferably, a drain pipe is fixedly installed on one side of the bottom of the water tank for discharging sewage, and a valve is provided on the drain pipe. A water replenishment bucket is fixedly installed on the top of the water tank for replenishing water into the water tank.

[0009] Preferably, the upper separation box has an inlet corresponding to the connecting cylinder on its top inner wall for waste to pass through. A baffle plate is fixedly installed on the top inner wall of the upper separation box. The bottom of the baffle plate contacts the top of the feed side of the mesh conveyor belt. The baffle plate is offset from the inlet. The two sides of the baffle plate are fixedly connected to the two inner walls of the upper separation box to block waste from entering the upper separation box.

[0010] Preferably, an adjusting shaft is rotatably installed inside the upper separation box, and a height-limiting smoothing plate is fixedly sleeved on the adjusting shaft. The height-limiting smoothing plate is located on the other side of the inlet opposite to the baffle plate. The two sides of the height-limiting smoothing plate are in contact with the inner walls of the two sides of the upper separation box, the top of the height-limiting smoothing plate is in contact with the inner wall of the top of the upper separation box, and the bottom height of the height-limiting smoothing plate is lower than the height of the nozzle to limit the height of waste passing through. Both ends of the adjusting shaft extend to the outside of the upper separation box and are threaded with fixing nuts for adjusting the angle and smoothing height of the height-limiting smoothing plate. The inner side of the fixing nut abuts against the outer wall of the upper separation box.

[0011] Preferably, the lower separation box has a drop opening at the top, and the upper separation box has an opening at the bottom. The size of the bottom opening of the upper separation box is equal to the size of the drop opening. The mesh conveyor belt passes through the drop opening, and the width of the mesh conveyor belt is equal to the inner width of the upper separation box and the drop opening, in order to prevent waste from falling without screening.

[0012] Preferably, the inner width of the lower separation box is greater than the width of the upper separation box, i.e., greater than the width of the mesh conveyor belt, so that there is a discharge gap between the inner walls on both sides of the lower separation box and the two sides of the mesh conveyor belt. The mesh receiving drawer is located below the discharge gap and is used to collect impurities. The lower separation box is equipped with a scraping mechanism, which is arranged crosswise with the mesh conveyor belt. The scraping mechanism is a conveyor belt structure. The discharge side of the scraping mechanism is located above the mesh receiving drawer, and the scraping mechanism is correspondingly arranged with the upper bottom side of the mesh conveyor belt. During operation, it is used to scrape off impurities on the upper bottom side of the mesh conveyor belt.

[0013] Preferably, the top of the water tank is provided with a return water inlet, and the bottom of the lower separation tank is an opening, with the opening size of the return water inlet being the same as the opening size of the bottom of the lower separation tank.

[0014] Preferably, the mesh receiving drawer has smaller holes than the mesh conveyor belt, and the two sides of the mesh receiving drawer have guide rails to the inner wall of the lower separation box.

[0015] Compared with related technologies, the marine plastic waste recycling and treatment device provided by the present invention has the following advantages:

[0016] Beneficial effects:

[0017] Compared with existing technologies, the marine plastic waste recycling and treatment device provided by this solution adopts an integrated vertical layout, compressing the five major processes of crushing, washing, screening, filtration and water return into the same three-dimensional space. This significantly reduces the risk of leakage of plastic fragments and microplastics, effectively completing crushing and washing in one device. It can also separate large and small plastics, facilitating centralized processing, improving recycling rate and reducing secondary pollution. Attached Figure Description

[0018] Figure 1 This is a bottom-view three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a front-view stereoscopic structural diagram of the present invention;

[0020] Figure 3 for Figure 1 An enlarged structural diagram of part A shown in the figure;

[0021] Figure 4 This is a schematic diagram of the front cross-sectional structure of the present invention;

[0022] Figure 5 for Figure 4 An enlarged structural diagram of part B shown in the figure;

[0023] Figure 6 for Figure 4 An enlarged structural diagram of section C shown in the figure;

[0024] Figure 7 for Figure 4 An enlarged structural diagram of part D shown in the figure;

[0025] Figure 8 for Figure 4 An enlarged structural diagram of part E shown in the figure;

[0026] Figure 9 for Figure 8 An enlarged structural diagram of part F shown in the figure;

[0027] Figure 10 This is a bottom view of the crushing cylinder section.

[0028] Figure 11 A front-view three-dimensional structural diagram of the mesh conveyor belt and the scraping mechanism;

[0029] Figure 12 This is a front-view three-dimensional distribution diagram of the crushing mechanism.

[0030] Attached reference numerals: 1. Water tank; 2. Lower separation box; 3. Upper separation box; 4. Crushing round box; 5. Feed hopper; 6. Connecting cylinder; 7. Mesh conveyor belt; 8. Solid discharge port; 9. Solid guide plate; 10. Mesh receiving drawer; 11. Sprinkler hollow plate; 12. Installation port; 13. Sprinkler head; 14. Water pump; 15. Water supply pipe; 16. Water distribution ring; 17. Water distribution pipe; 18. Drain hole; 19. Sewage pipe; 20. Water replenishment hopper; 21. Inlet; 22. Baffle plate; 23. Adjusting shaft; 24. Height limiting plate; 25. Fixing nut; 26. Drop outlet; 27. Conveyor belt; 28. Feeding roller; 29. ​​Guide roller; 30. Shielding sleeve; 31. Conveyor shaft; 32. Limiting wheel; 33. Narrow belt; 34. Cleaning scraper; 35. Support frame; 36. Motor; 37. Shaft frame one; 38. Input shaft; 39. Bevel gear one; 40. Shaft frame two; 41. Power transmission shaft; 42. Synchronous pulley; 43. Synchronous belt; 44. Bevel gear two; 45. Gathering cylinder; 46. Clearance notch; 47. Cutter shaft; 48. Mounting cylinder; 49. Crushing blade; 50. Pinion; 51. Transmission gear ring; 52. Bevel gear disc; 53. Return water port. Detailed Implementation

[0031] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] This invention provides a marine plastic waste recycling and processing device, such as... Figure 1-12As shown, the marine plastic waste recycling and processing device includes: a water tank 1, a lower separation tank 2, an upper separation tank 3, and a crushing cylinder 4. The lower separation tank 2 is fixedly installed on top of the water tank 1, the upper separation tank 3 is fixedly installed on top of the lower separation tank 2, and the crushing cylinder 4 is fixedly installed on top of the upper separation tank 3. The water tank 1, lower separation tank 2, upper separation tank 3, and crushing cylinder 4 are connected in sequence. A feed hopper 5 is fixedly installed on the top of the crushing cylinder 4 for introducing waste into the crushing cylinder 4. The crushing cylinder 4 is equipped with a crushing mechanism for crushing the waste. A connecting cylinder 6 is fixedly installed between the bottom of the crushing cylinder 4 and the top of the upper separation tank 3 for introducing the crushed material in the crushing cylinder 4 into the upper separation tank 3 for separation. A spraying mechanism is installed on the top of the upper separation tank 3 for spraying the material entering the upper separation tank. The crushed waste in the separation box 3 is sprayed and cleaned, and the spraying mechanism is located on one side of the connecting cylinder 6. The upper separation box 3 and the lower separation box 2 are equipped with a mesh conveyor belt 7, which is used to receive the material entering the upper separation box 3 for transmission and separation. The waste is discharged from the upper separation box 3, and the screened water and impurities fall into the lower separation box 2, so that the water flows back into the water tank 1. The upper separation box 3 has a solid discharge port 8 on one side, and a solid guide plate 9 is fixedly installed at the solid discharge port 8. The receiving end of the solid guide plate 9 overlaps with the discharge side of the mesh conveyor belt 7, and the discharge end extends to the outside of the upper separation box 3 through the solid discharge port 8. The lower separation box 2 has a pull-out mesh receiving drawer 10 on one side, which is located below the mesh conveyor belt 7 and is used to receive impurities and water for separation, so that the water flows back into the water tank 1.

[0033] In this embodiment, the marine plastic waste to be treated is fed into the crushing box 4 through the feed hopper 5. The crushing mechanism first performs a one-time crushing. The crushed mixture falls into the upper separation box 3 through the connecting cylinder 6 and simultaneously falls onto the upper surface of the mesh conveyor belt 7. The spraying mechanism is activated, and the washing water covers the belt surface in an umbrella shape, washing away impurities and smaller plastics attached to the surface of the plastic fragments. Larger plastic fragments continue to move forward with the mesh conveyor belt 7 and are finally discharged through the solid guide plate 9 and the solid discharge port 8, realizing the collection of "dry" materials. The wastewater containing impurities that is washed down falls into the mesh receiving drawer 10. The mesh receiving drawer 10 performs secondary interception of coarse impurities and intercepts small plastics and solid impurities. The filtered water continues to fall and flows back to the water tank 1, forming a closed water cycle. The entire process only requires one person to pull out the mesh receiving drawer 10 to complete the impurity cleaning. The impurities are further screened to separate small plastics, which can be centrally processed.

[0034] In this embodiment, the crushing cylinder 4, the upper separation box 3, the lower separation box 2, and the water tank 1 are rigidly connected in series from top to bottom, forming a vertical closed loop of "crushing - spray washing - mesh belt separation - drawer fine filtration - water reuse"; the mesh conveyor belt 7 spans the upper separation box 3 and the lower separation box 2, and its mesh aperture is between that of conventional plastic fragments and impurities. Utilizing the gravity-water flow coupling effect, conventionally sized plastics are "lifted" onto the belt surface for output, while smaller plastics, impurities, and water are "pulled" to the lower layer; the mesh receiving drawer 10 is horizontally inserted into the lower separation box 2 by a pull-out method, located in the vertical projection area of ​​the belt surface, and can be removed and cleaned immediately to avoid secondary suspension of impurities; the water tank 1 is located at the bottom and serves as a sedimentation and water storage unit, continuously providing recycled water for the spraying mechanism to achieve zero discharge of operating water.

[0035] The integrated vertical layout compresses the five major processes of crushing, washing, screening, filtration and water return into the same three-dimensional space, which greatly reduces the risk of leakage of plastic fragments and microplastics. It can effectively complete crushing and washing in one piece of equipment, and can also separate large and small plastics for centralized processing, improve recycling rate and reduce secondary pollution.

[0036] The mesh conveyor belt 7 and the mesh receiving drawer 10 form a two-stage mechanical barrier, which separates plastic and impurities in real time during the process. Impurities no longer flow back to the water tank 1, which can extend the water usage cycle and reduce water replacement and secondary pollution.

[0037] In a further preferred embodiment of the present invention, the spraying mechanism includes a water-spraying hollow plate 11, which is fixedly installed on the top of the upper separation box 3. The top of the upper separation box 3 has an installation port 12, which corresponds to the water-spraying hollow plate 11. A plurality of nozzles 13 are fixedly installed on the bottom of the water-spraying hollow plate 11, and the plurality of nozzles 13 are all located inside the installation port 12, corresponding to the mesh conveyor belt 7 below, for spraying and cleaning the conveyed waste. A water pump 14 is provided in the water tank 1, and a water inlet pipe 15 is installed at the drain end of the water pump 14. The drain end of the water inlet pipe 15 is connected to the water-spraying hollow plate 11 for supplying water.

[0038] In this embodiment, the water pump 14 is started, and the recycled water in the water tank 1 is pumped into the water spraying hollow plate 11 along the water pipe 15. After the water flow is evenly pressurized in the plate cavity, it is sprayed downward in a fan-shaped mist from the nozzle 13, directly covering the surface of the mesh conveyor belt 7. The broken plastic fragments are continuously sprayed during the movement of the belt surface, and the seaweed, shells and micro-plastics attached to the surface are immediately peeled off and pass through the mesh with the water flow, entering the mesh receiving drawer 10 below, realizing simultaneous conveying and washing.

[0039] The water-sprinkling hollow plate 11 is embedded in the top wall of the upper separation box 3 via the mounting port 12, forming a sunken water distribution unit. Its bottom surface is densely covered with spray nozzles 13, so that the spraying area and the material drop area are completely overlapped in the vertical direction. The suction port of the water pump 14 is located on the upper clear liquid surface of the settling area of ​​the water tank 1, and the drain port is connected to the side interface of the water-sprinkling hollow plate 11 via the water inlet pipe 15, forming a closed-loop water chain. The spray nozzles 13 form a uniform water curtain to ensure the stripping effect. The clean water after secondary interception by the mesh receiving drawer 10 flows back to the water tank 1 by gravity, completing the self-circulation.

[0040] In a further preferred embodiment of the present invention, a water distribution ring 16 is fixedly sleeved on the outside of the feed hopper 5, a water distribution pipe 17 is fixedly installed on the water supply pipe 15, a valve is provided on the water distribution pipe 17, and the drain end of the water distribution pipe 17 is connected to the water distribution ring 16 for supplying water to the water distribution ring 16. A plurality of drain holes 18 are evenly arranged in a ring array on the inner wall of the feed hopper 5, and the plurality of drain holes 18 are all connected to the water distribution ring 16 for spraying water on the waste entering the feed hopper 5.

[0041] In this embodiment, after starting the water pump 14, the valve on the water distribution pipe 17 is opened, and part of the recycled water is diverted into the water distribution ring 16 through the water supply pipe 15. The water distribution ring 16 evenly distributes the pressurized water to each drain hole 18 on the inner wall of the feed hopper 5, forming an annular water curtain before the waste falls into the crushing box 4, pre-wetting the material and rinsing off the loose salt and floating mud on the surface. The operator can adjust the valve opening at any time according to the salt content of the waste to achieve a sequential batch operation of "spraying first and then crushing" to reduce the subsequent surface cleaning load.

[0042] The water distribution ring 16 is sealed on the outer wall of the feed hopper 5, and its inner cavity is connected to the drain holes 18 arranged in a ring array. The water distribution pipe 17 is led out from the high-pressure side water pipe 15 and forms an independent branch through the valve, connecting the water spraying hollow plate 11 and the water distribution ring 16 in parallel to the same pump source. The drain holes 18 are opened tangentially along the hopper wall, and the water flows down in a spiral shape, which not only extends the wetting path, but also avoids material splashing caused by vertical jet.

[0043] In a further preferred embodiment of the present invention, a drain pipe 19 is fixedly installed on one side of the bottom of the water tank 1 for discharging sewage, and a valve is provided on the drain pipe 19. A water replenishment bucket 20 is fixedly installed on the top of the water tank 1 for replenishing water into the water tank 1.

[0044] In this embodiment, when the salt or microparticles in the water tank 1 accumulate to the point where water needs to be changed, the valve on the drain pipe 19 is opened, and the concentrated brine and sludge deposited at the bottom of the tank are quickly drained under gravity. After the valve is closed, external fresh water or simply filtered seawater is directly introduced through the water replenishment hopper 20 to restore the circulating water volume and cleanliness.

[0045] In a further preferred embodiment of the present invention, an inlet 21 corresponding to the connecting cylinder 6 is provided on the top inner wall of the upper separation box 3 for waste to pass through. A baffle plate 22 is fixedly installed on the top inner wall of the upper separation box 3. The bottom of the baffle plate 22 is in contact with the top of the feed side of the mesh conveyor belt 7. The baffle plate 22 is offset from the inlet 21. The two sides of the baffle plate 22 are fixedly connected to the two inner walls of the upper separation box 3 to block waste from entering the upper separation box 3.

[0046] In this embodiment, the crushed mixture falls vertically into the upper separation box 3 through the connecting cylinder 6 and the inlet 21. It is first intercepted by the baffle plate 22 and guided to the material-bearing surface of the mesh conveyor belt 7. The bottom edge of the baffle plate 22 maintains sliding contact with the belt surface, and the material is restricted in the semi-closed cavity formed by the belt surface and the baffle plate 22, and is conveyed forward with the belt surface.

[0047] In a further preferred embodiment of the present invention, an adjusting shaft 23 is rotatably installed inside the upper separation box 3, and a height limiting plate 24 is fixedly sleeved on the adjusting shaft 23. The height limiting plate 24 is located on the other side of the inlet 21 opposite to the baffle plate 22. The two sides of the height limiting plate 24 are in contact with the inner walls of the two sides of the upper separation box 3, and the top of the height limiting plate 24 is in contact with the inner wall of the top of the upper separation box 3. The bottom height of the height limiting plate 24 is lower than the height of the nozzle 13, which is used to limit the height of waste passing through. Both ends of the adjusting shaft 23 extend to the outside of the upper separation box 3 and are threaded with fixing nuts 25, which are used to adjust the angle and leveling height of the height limiting plate 24. The inner side of the fixing nut 25 abuts against the outer wall of the upper separation box 3.

[0048] In this embodiment, after the material is guided by the baffle plate 22 to the mesh conveyor belt 7, it first arrives at the height limiting plate 24, and then passes under the nozzle 13 to complete the initial spraying. According to the average particle size and thickness of the waste, the fixing nut 25 is loosened, the adjusting shaft 23 is rotated to keep the bottom edge of the height limiting plate 24 and the belt surface at the required gap, and then the fixing nut 25 is tightened. The plate then performs a triple action of "scraping-pressing-spreading" on the piled material, smoothing out the protruding parts to facilitate the subsequent spraying and separation process.

[0049] In a further preferred embodiment of the present invention, the lower separation box 2 has a drop opening 26 at its top, and the upper separation box 3 has an opening at its bottom. The size of the bottom opening of the upper separation box 3 is equal to the size of the drop opening 26. The mesh conveyor belt 7 passes through the drop opening 26, and the width of the mesh conveyor belt 7 is equal to the inner width of the upper separation box 3 and the drop opening 26, in order to prevent waste from falling without screening.

[0050] In this embodiment, the mesh conveyor belt 7 is installed horizontally through the drop outlet 26, with its two sides in full contact with the inner walls of the upper separation box 3 and the drop outlet 26. During operation, the material is flattened by the height-limiting flat plate 24 and moves forward with the belt. All washing wastewater and impurities with a particle size smaller than the mesh can only fall vertically through the mesh openings of the belt, while large-sized plastics are carried by the belt surface and continue to be transported to the solid discharge outlet 8, thus achieving forced screening.

[0051] The drop outlet 26 is the same width and coaxial with the bottom opening of the upper separation box 3, forming a rectangular channel with the same width as the mesh conveyor belt 7; there are no gaps on both sides of the belt surface, forming a continuous side seal, and the material is completely constrained in the width direction of the belt surface, preventing it from sliding off the side; the channel length covers the entire spraying and separation area, so that "screening-conveying-collection" is completed in the same vertical projection plane, preventing unscreened material from directly entering the lower separation box 2.

[0052] In a further preferred embodiment of the present invention, the inner width of the lower separation box 2 is greater than the width of the upper separation box 3, that is, greater than the width of the mesh conveyor belt 7, so that there is a discharge gap between the inner walls on both sides of the lower separation box 2 and the two sides of the mesh conveyor belt 7. The mesh receiving drawer 10 is located below the discharge gap and is used to collect impurities. The lower separation box 2 is provided with a scraping mechanism, which is arranged crosswise with the mesh conveyor belt 7. The scraping mechanism is a conveyor belt structure. The discharge side of the scraping mechanism is located above the mesh receiving drawer 10, and the scraping mechanism is correspondingly arranged with the upper bottom side of the mesh conveyor belt 7. During operation, it is used to scrape off the impurities on the upper bottom side of the mesh conveyor belt 7.

[0053] In this embodiment, after startup, the mesh conveyor belt 7 carries residual water droplets and fine impurities to the return section; at this time, the conveyor belt of the scraping mechanism maintains line contact with the upper bottom of the mesh conveyor belt 7, and scrapes off the impurities adhering to the mesh conveyor belt 7 in an instant. The scraped-off impurities are transported laterally along the scraping mechanism belt surface to the discharge side and fall freely into the mesh receiving drawer 10 directly below; the operator only needs to pull out the drawer periodically and empty it to complete the "online mesh cleaning".

[0054] The inner cavity of the lower separation box 2 is wider than that of the upper separation box 3, forming a symmetrical discharge gap, which provides lateral installation space for the scraping mechanism. The scraping mechanism adopts a micro conveyor belt structure, and its belt surface intersects the return section of the mesh conveyor belt 7 at an acute angle. It uses elastic scrapers or protrusions to embed into the mesh, generating a shearing action, causing the embedded material to loosen and be transported outward with the scraping belt surface. The discharge side of the scraping mechanism extends to the center of the gap, directly opposite the opening of the mesh receiving drawer 10, ensuring that the scraped material does not scatter and falls into the drawer for centralized collection.

[0055] In a further preferred embodiment of the present invention, the top of the water tank 1 is provided with a return water inlet 53, and the bottom of the lower separation tank 2 is open, and the opening size of the return water inlet 53 is the same as the opening size of the bottom of the lower separation tank 2.

[0056] In this embodiment, when the device is running, since the return water inlet 53 is aligned with the bottom opening of the lower separation tank 2 of the same size, the water flows directly into the water tank 1, completing the instantaneous return flow.

[0057] In a further preferred embodiment of the present invention, the mesh receiving drawer 10 has smaller holes than the mesh conveyor belt 7, and the two sides of the mesh receiving drawer 10 have guide rails on the inner wall of the lower separation box 2.

[0058] In this embodiment, during pull-out installation, the two sides of the mesh receiving drawer 10 are aligned with the guide rails on the inner wall of the lower separation box 2 and pushed in horizontally until the front end of the drawer abuts against the box limit. During operation, wastewater carrying fine impurities falls into the drawer, and the drawer mesh with smaller apertures performs secondary interception of microplastics and sand particles, while clean water continues to drain into the water tank 1. Cleaning operations only require pulling out the drawer.

[0059] To further improve the performance of this device, in addition to the above-mentioned solutions, this solution also includes the following embodiments:

[0060] In another embodiment of the present invention, two conveyor rollers 27 are rotatably installed inside the upper separation box 3, and two guide rollers 28 are rotatably installed inside the lower separation box 2. The mesh conveyor belt 7 is sleeved on the two conveyor rollers 27 and the guide rollers 28. One of the conveyor rollers 27 rotates to move the mesh conveyor belt 7. Each of the two guide rollers 28 is covered with a shielding sleeve 29. The two ends of the shielding sleeve 29 are fixedly connected to the inner walls of the two sides of the lower separation box 2 to fix it. The end face of the shielding sleeve 29 is in contact with the inner side of the mesh conveyor belt 7 to prevent impurities from falling into the guide rollers 28.

[0061] In this embodiment, when any one of the conveyor rollers 27 rotates, the mesh conveyor belt 7 circulates between the two conveyor rollers 27 and the two guide rollers 28. The outer periphery of the guide roller 28 is covered by a sleeve-shaped shielding sleeve 29, and the top wall of the shielding sleeve 29 maintains sliding contact with the inner side of the belt. During operation, the operator does not need to clean it, which can ensure that the falling impurities are blocked outside the shielding sleeve 29 and keep the roller surface clean.

[0062] The shielding sleeve 29 is a fixed semi-enclosed sleeve with both ends fixed to the side wall of the lower separation box 2, forming a dynamic and static fit with the rotating guide roller 28 to further clean the mesh conveyor belt 7.

[0063] In another embodiment of the present invention, the scraping mechanism includes two conveying shafts 30, both of which are rotatably installed in the lower separation box 2. Both conveying shafts 30 are located between the two conveying rollers 27 and the guide rollers 28, and are respectively located at corresponding discharge gap positions. One of the conveying shafts 30 is located above the mesh receiving drawer 10. Each of the two conveying shafts 30 is fixedly fitted with a limiting wheel 31, and each of the limiting wheels 31 of the two conveying shafts 30 is fitted with a narrow belt 32. The narrow belt 32 passes through the interior of the mesh conveyor belt 7, and multiple cleaning scrapers 33 are evenly fixedly installed on the narrow belt 32. The bottom of the cleaning scraper 33 rotates to the bottom inner side of the mesh conveyor belt 7 and is used to scrape the impurities on the bottom inner side of the mesh conveyor belt 7 into the mesh receiving drawer 10.

[0064] In this embodiment, when any one of the conveying shafts 30 rotates, the limiting wheels 31 on the two shafts rotate synchronously, driving the narrow belt 32 to circulate inside the mesh conveyor belt 7; when the cleaning scraper 33 runs with the narrow belt 32 to the lower plane, its bottom slides into contact with the inner bottom of the mesh conveyor belt 7, pushing the adhering impurities toward the discharge side, and finally falling into the mesh receiving drawer 10; the operator only needs to periodically check the wear of the cleaning scraper 33.

[0065] Two conveyor shafts 30 are respectively arranged above the discharge gap. The narrow belt 32 forms an independent closed loop inside the mesh conveyor belt 7. The cleaning scraper 33 spans the width of the mesh conveyor belt 7 laterally. When the cleaning scraper 33 rotates to the lower stroke, its end face maintains line contact with the inner side of the bottom of the belt body. It uses mechanical scraping to peel off the adhering material and throws the impurities to the mesh receiving drawer 10 located below the shaft during continued operation. The limit wheel 31 ensures that the narrow belt 32 is always in a taut state to avoid lateral movement.

[0066] In another embodiment of the present invention, the crushing chamber 4 and the water tank 1 are fixedly supported by a support frame 34. A motor 35 is fixedly mounted on the support frame 34. A shaft bracket 36 is fixedly mounted on the top of the upper separation chamber 3. An input shaft 37 is rotatably mounted on the shaft bracket 36. A bevel gear 38 is fixedly mounted on both the input shaft 37 and the output shaft of the motor 35. The two bevel gears 38 mesh to drive the input shaft 37 to rotate. A shaft bracket 39 is fixedly mounted on the side of the upper separation chamber 3. A power transmission shaft 40 is rotatably mounted on the second frame 39. Synchronous pulleys 41 are fixedly mounted on the input shaft 37, the power transmission shaft 40, and one of the conveying shafts 30. The same synchronous belt 42 is sleeved on the three synchronous pulleys 41 so that the input shaft 37 drives the power transmission shaft 40 and one of the conveying shafts 30 to rotate synchronously, thereby running the scraping mechanism. The ends of the power transmission shaft 40 and the corresponding conveying roller 27 are fixedly mounted with bevel gears 43. The two bevel gears 43 mesh with each other to run the mesh conveyor belt 7.

[0067] In this embodiment, after the motor 35 is started, the support frame 34 keeps the whole machine stable; the output shaft of the motor 35 drives the input shaft 37 to rotate through a pair of bevel gears 38, and the input shaft 37 drives the power transmission shaft 40 and one of the conveying shafts 30 synchronously through the synchronous pulley 41 and the synchronous belt 42, so that the scraping mechanism runs immediately; the power transmission shaft 40 then drives the corresponding conveyor roller 27 through a pair of bevel gears 43, and the mesh conveyor belt 7 moves accordingly, realizing the centralized drive of "one machine with multiple actions", and the operator only needs to control the motor 35 to simultaneously complete the conveying of the belt surface and the cleaning of the mesh.

[0068] The support frame 34 fixes the motor 35 between the crushing box 4 and the water tank 1, forming a rigid power platform; the first bevel gear 38 converts the horizontal output of the motor 35 into vertical power to drive the input shaft 37; the first shaft frame 36 and the second shaft frame 39 respectively support the input shaft 37 and the power transmission shaft 40, ensuring accurate alignment of the gears and belt drives; the synchronous belt 42 bridges the input shaft 37, the power transmission shaft 40 and the conveyor shaft 30, so that the scraping narrow belt 32 and the mesh conveyor belt 7 maintain a fixed speed ratio, ensuring that the scraping position of the cleaning scraper 33 is relatively fixed with the mesh holes each time; the second bevel gear 43 further transmits the power to the conveyor roller 27, completing the overall closed-loop drive.

[0069] In another embodiment of the present invention, the crushing mechanism includes a material-gathering cylinder 44 fixedly installed inside the crushing cylinder 4. The inner diameter of the material-gathering cylinder 44 is equal to the inner diameter of the bottom end of the feed hopper 5 and the top end of the connecting cylinder 6, so that the material-gathering cylinder 44 serves as a channel for the crushing and passage of waste. The material-gathering cylinder 44 has multiple clearance notches 45, which are distributed vertically and staggered at angles. Multiple cutter shafts 46 are rotatably mounted around the material-gathering cylinder 44 at the bottom of the crushing cylinder 4. The number of cutter shafts 46 is equal to the number of clearance notches 45. Mounting cylinders 47 are fixedly fitted onto each of the multiple cutter shafts 46. The installation height and angle of the mounting cylinders 47 correspond to the installation height and angle of the clearance notches 45, respectively. Multiple crushing blades 48 are fixedly mounted on each of the multiple cutter shafts 46. When the blade shaft 46 drives the corresponding mounting cylinder 47 and crushing blade 48 to rotate, the crushing blade 48 rotates through the corresponding clearance notch 45. Multiple crushing blades 48 inside the material collection cylinder 44 are driven to rotate by different blade shafts 46 and are arranged vertically inside the cylinder to crush the waste passing through the material collection cylinder 44. The bottom ends of multiple blade shafts 46 are fixedly installed with pinions 49. The connecting cylinder 6 is rotatably fitted with a transmission gear ring 50 and a conical gear disk 51. The transmission gear ring 50 meshes with multiple pinions 49 so that the transmission gear ring 50 drives multiple blade shafts 46 to rotate synchronously. The conical gear disk 51 is fixedly installed at the bottom of the transmission gear ring 50. A conical gear 52 is fixedly fitted on the input shaft 37. The conical gear 52 meshes with the conical gear disk 51 so that the motor 35 drives the transmission gear ring 50 and the conical gear disk 51 to rotate.

[0070] In this embodiment, after the motor 35 is started, the power is transmitted to the conical gear disk 51 via the input shaft 37 and the bevel gear 3 52, causing the transmission gear ring 50 to rotate synchronously. The transmission gear ring 50 simultaneously drives multiple pinions 49, causing each cutter shaft 46 to revolve around the center of the material collection cylinder 44 and rotate at high speed. Waste falls into the material collection cylinder 44 from the feed hopper 5 and is repeatedly cut by the vertically and angularly staggered crushing blades 48 inside the cylinder. When the particle size is smaller than the screening channel formed by the blade gap and the clearance notch 45, the crushed material is discharged by gravity through the connecting cylinder 6, achieving continuous and uniform crushing.

[0071] The material-collecting cylinder 44 serves as the sole crushing chamber, with its peripheral walls featuring offset clearance notches 45 at varying heights and angles. Each blade shaft 46 has a corresponding mounting cylinder 47 with a corresponding notch, ensuring that the crushing blades 48 precisely cut into the cylinder cavity during rotation, forming a three-dimensional interlaced blade network. The transmission gear ring 50 is integrally formed with the conical gear disc 51, transmitting torque and bearing axial force, allowing multiple blade shafts 46 to maintain their own rotation while revolving around the central axis. The conical gear disc 51 meshes perpendicularly with the bevel gear 32, converting longitudinal power into circumferential power, enabling centralized drive by a single motor 35. When the crushing blades 48 pass through the clearance notches 45, they exert a combined effect of shearing, tearing, and compressing on the material, with overlapping trajectories between the upper and lower blade layers, ensuring that large pieces of plastic are progressively crushed to a uniform particle size.

[0072] In summary, compared with related technologies, this device adopts an integrated vertical layout that compresses the five major processes of crushing, washing, screening, filtration, and water return into the same three-dimensional space, significantly reducing the risk of leakage of plastic fragments and microplastics. It effectively completes crushing and washing in one piece of equipment, and can also separate large and small plastics for centralized processing, improving the recycling rate and reducing secondary pollution.

[0073] It should be understood, in the several embodiments provided in this application, that the disclosed apparatus may be implemented in other ways.

[0074] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of the present invention according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of the present invention. These technical solutions also fall within the scope of protection of the present invention.

Claims

1. A marine plastic waste recycling and processing device, characterized in that, include: The system comprises a water tank, a lower separation tank, an upper separation tank, and a grinding chamber. The lower separation tank is fixedly installed on top of the water tank, the upper separation tank is fixedly installed on top of the lower separation tank, and the grinding chamber is fixedly installed on top of the upper separation tank. The water tank, lower separation tank, upper separation tank, and grinding chamber are connected in sequence. A feed hopper is fixedly installed on the top of the crushing box for introducing waste into the crushing box. The crushing box is equipped with a crushing mechanism for crushing waste. A connecting cylinder is fixedly installed between the bottom of the crushing box and the top of the upper separation box for introducing the crushed waste into the upper separation box for separation. The top of the upper separation box is equipped with a spraying mechanism for spraying and cleaning the crushed waste entering the upper separation box. The spraying mechanism is located on one side of the connecting cylinder. The upper and lower separation boxes are equipped with mesh conveyor belts for receiving waste entering the upper separation box for transport and separation. The waste is discharged from the upper separation box, and the screened water and impurities fall into the lower separation box, allowing the water to flow back into the water tank. The upper separation box has a solid discharge port on one side, and a solid guide plate is fixedly installed at the solid discharge port. The receiving end of the solid guide plate overlaps with the discharge end of the mesh conveyor belt, and the discharge end extends to the outside of the upper separation box through the solid discharge port. A mesh receiving drawer is pulled out on one side of the lower separation box. The mesh receiving drawer is located below the mesh conveyor belt and is used to collect impurities and water for separation, so that the water flows back into the water tank. Two conveyor rollers are rotatably installed inside the upper separation box, and two guide rollers are rotatably installed inside the lower separation box. The mesh conveyor belt is sleeved on the two conveyor rollers and the guide rollers. One of the conveyor rollers rotates to move the mesh conveyor belt. A shielding sleeve is sleeved on the outside of both guide rollers. The two ends of the shielding sleeve are fixedly connected to the inner walls of the two sides of the lower separation box to fix it. The end face of the shielding sleeve is in contact with the inner side of the mesh conveyor belt to prevent impurities from falling into the guide rollers. The inner width of the lower separation box is greater than the width of the upper separation box, which is greater than the width of the mesh conveyor belt, so that there is a discharge gap between the inner walls of the two sides of the lower separation box and the two sides of the mesh conveyor belt. The mesh receiving drawer is located below the discharge gap and is used to collect impurities. The lower separation box is equipped with a scraping mechanism, which is arranged crosswise with the mesh conveyor belt. The scraping mechanism is a conveyor belt structure. The discharge side of the scraping mechanism is located above the mesh receiving drawer, and the scraping mechanism is correspondingly arranged with the upper bottom side of the mesh conveyor belt. During operation, it is used to scrape off the impurities on the upper bottom side of the mesh conveyor belt. The scraping mechanism includes two conveyor shafts, both of which are rotatably installed inside the lower separation box. The two conveyor shafts are located between the two conveyor rollers and the guide roller, respectively, at corresponding discharge gap positions. One of the conveyor shafts is positioned above the mesh receiving drawer. Limiting wheels are fixedly fitted onto both conveyor shafts, and narrow belts are fitted onto the limiting wheels of both conveyor shafts. The narrow belts traverse the interior of the mesh conveyor belt, and multiple cleaning scrapers are evenly fixedly installed on the narrow belts. The bottom of the cleaning scraper rotating to the lower position contacts the inner bottom of the mesh conveyor belt, used to scrape impurities from the inner bottom of the mesh conveyor belt into the mesh receiving drawer.

2. The marine plastic waste recycling and treatment device as described in claim 1, characterized in that, The spraying mechanism includes a hollow water-spraying plate, which is fixedly installed on the top of the upper separation box. The top of the upper separation box has an installation opening corresponding to the hollow water-spraying plate. Multiple nozzles are fixedly installed on the bottom of the hollow water-spraying plate, all of which are located inside the installation opening and correspond to the mesh conveyor belt below. This is used to spray and clean the transported waste. A water pump is installed in the water tank, and a water inlet pipe is installed at the drain end of the water pump. The drain end of the water inlet pipe is connected to the hollow water-spraying plate for water supply.

3. The marine plastic waste recycling and treatment device as described in claim 2, characterized in that, A water distribution ring is fixedly fitted on the outside of the feed hopper. A water distribution pipe is fixedly installed on the water supply pipe. A valve is provided on the water distribution pipe. The drain end of the water distribution pipe is connected to the water distribution ring for supplying water to the water distribution ring. Multiple drain holes are evenly arranged in a ring array on the inner wall of the feed hopper. All of the multiple drain holes are connected to the water distribution ring for spraying water on the waste entering the feed hopper.

4. The marine plastic waste recycling and treatment device as described in claim 1, characterized in that, A drain pipe is fixedly installed on one side of the bottom of the water tank for discharging sewage. A valve is provided on the drain pipe. A water replenishment bucket is fixedly installed on the top of the water tank for replenishing water into the tank.

5. A marine plastic waste recycling and treatment device as described in claim 2, characterized in that, The upper separation box has an inlet corresponding to the connecting cylinder on its top inner wall for waste to pass through. A baffle plate is fixedly installed on the top inner wall of the upper separation box. The bottom of the baffle plate contacts the top of the feed side of the mesh conveyor belt. The baffle plate is offset from the inlet. The two sides of the baffle plate are fixedly connected to the two inner walls of the upper separation box to block waste from entering the upper separation box.

6. The marine plastic waste recycling and treatment device as described in claim 5, characterized in that, An adjusting shaft is rotatably installed inside the upper separation box. A height-limiting smoothing plate is fixedly sleeved on the adjusting shaft. The height-limiting smoothing plate is located on the other side of the inlet opposite to the baffle plate. The two sides of the height-limiting smoothing plate are in contact with the inner walls of the two sides of the upper separation box, and the top of the height-limiting smoothing plate is in contact with the inner wall of the top of the upper separation box. The bottom height of the height-limiting smoothing plate is lower than the height of the nozzle to limit the height of waste passing through. Both ends of the adjusting shaft extend to the outside of the upper separation box and are threaded with fixing nuts for adjusting the angle and smoothing height of the height-limiting smoothing plate. The inner side of the fixing nut abuts against the outer wall of the upper separation box.

7. The marine plastic waste recycling and treatment device as described in claim 1, characterized in that, The lower separation box has a drop opening at the top, and the upper separation box has an opening at the bottom. The size of the bottom opening of the upper separation box is equal to the size of the drop opening. The mesh conveyor belt passes through the drop opening, and the width of the mesh conveyor belt is equal to the inner width of the upper separation box and the drop opening, in order to prevent waste from falling without screening.

8. A marine plastic waste recycling and treatment device as described in claim 1, characterized in that, The water tank has a return water inlet at the top, and the bottom of the lower separation tank is open. The opening size of the return water inlet is the same as the opening size of the bottom of the lower separation tank.

9. A marine plastic waste recycling and treatment device as described in claim 1, characterized in that, The mesh receiving drawer has smaller holes than the mesh conveyor belt, and the two sides of the mesh receiving drawer are connected to the inner wall of the lower separation box by guide rails.

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