Plastic waste recovery device

Abstract

The invention relates to the technical field of plastic recovery, and discloses a plastic waste recovery device which comprises an extruder. The cooling tank is arranged on one side of the extruder; the pelletizer is arranged at the top end of the cooling tank, and a first discharging pipe is arranged on one side of the pelletizer; the screening barrel is obliquely arranged on one side of the granulator, a plurality of screening plates are arranged in the screening barrel, a screening cavity is defined by the screening plates, a screening gap is formed between every two adjacent screening plates, and the first discharging pipe communicates with the screening cavity; a second discharging pipe is arranged on one side of the screening barrel, and qualified screened plastic particles are discharged through the second discharging pipe; and the adjusting assembly is arranged on one side of the screening barrel and used for adjusting the size of the screening gap. According to the plastic waste recovery device, through the sliding fit structure of the adjusting assembly and the screening plates, the screening gaps between the adjacent screening plates can be adjusted without replacing the screening plates, and the screening requirements of plastic particles with different particle size specifications are met.

Description

Technical Field

[0001] This invention relates to the field of plastic recycling technology, and more specifically to a plastic waste recycling device. Background Technology

[0002] Plastic extrusion granulation is a key process for recycling plastic waste. It involves melting, extruding, cooling, and pelletizing waste plastic to form reusable plastic pellets.

[0003] In related technologies, to solve the problem of rapid cooling of plastic strips after extrusion, for example, patent CN120985905A provides a plastic extrusion device for processing and recycling plastic waste. After extrusion, the plastic strip is cooled by a heat dissipation water tank and then granulated by a granulator to complete the granulation operation. The granules are guided by an inclined plate to one side of a large-aperture inclined screen. Subsequently, qualified granules are screened out by a small-aperture inclined screen and introduced into the quantitative feeding module through a second discharge port. Smaller granules will enter the guide box through a third discharge port. The guide box will guide oversized and undersized granules into the lifting component. The lifting component lifts the unqualified granules and sends them into the hopper for re-extrusion. This allows the device to extrude unqualified granules, thereby improving the overall quality of the granules and preventing unqualified granules from affecting the output quality.

[0004] Plastic granule screening equipment generally uses screens or screen plates with fixed apertures, making it impossible to flexibly adjust the screening size according to actual production needs. This deficiency results in extremely poor equipment versatility: when processing different types of plastic waste or producing recycled granules of different particle sizes, the entire screen plate assembly must be replaced, which is not only cumbersome and time-consuming, significantly increasing equipment downtime and operating costs, but also prone to causing equipment precision loss during the screen plate disassembly and assembly process. In addition, fixed screens are prone to material blockage and screen hole blinding during long-term use. Fine particles agglomerate and get stuck in the screen holes, reducing the effective screening area and requiring manual cleaning, further affecting production continuity. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a plastic waste recycling device, which can effectively solve the problem that the high moisture content of plastic particles after water cooling affects the quality of re-extrusion.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a plastic waste recycling device, comprising: Extruder; A cooling tank, located on one side of the extruder, is used to cool the extruded plastic strips; A granulator is positioned at the top of a cooling tank, and a first discharge pipe is provided on one side of the granulator; A screening barrel is inclined and set on one side of the granulator. A first discharge pipe is connected to the screening barrel. The screening barrel is equipped with several screening plates, which are arranged to form a screening chamber. A screening gap is formed between adjacent screening plates. The first discharge pipe is connected to the screening chamber. A second discharge pipe is set on one side of the screening barrel. The qualified plastic granules are discharged through the second discharge pipe. An adjustment component, located on one side of the screening barrel, is used to adjust the size of the screening gap.

[0007] Preferably, a first side cover and a second side cover are respectively provided on both sides of the screening barrel, and a first fixing ring is provided inside the first side cover and the second side cover; A first connecting ring is rotatably provided on the inner side of the first fixed ring, and a sliding column is provided on the inner side of the first connecting ring corresponding to the screening plate, and the screening plate slides through the sliding column.

[0008] Preferably, the other ends of several sliding pins connected to the same first connecting ring are connected to a second fixing ring; A connecting rod is fixedly installed on the inner side of the second fixed ring, and the other end of the connecting rod is connected to a drive column. The drive column is driven to rotate the second fixed ring, the sliding column and the screening plate.

[0009] Preferably, a sliding sleeve is slidably provided on the outer side of the sliding column, and an elastic element is provided between the sliding sleeve and the second fixing ring; The screening plate moves away from the second fixed ring under the action of the elastic element.

[0010] Preferably, a first groove is provided on one side of the screening plate, and a second groove is provided on the inner side of the sliding column corresponding to the first groove; The adjustment component includes: The third fixing ring is located on the outside of the screening plate; The second connecting ring is rotatably positioned inside the third fixed ring; A thrust plate is disposed on the side of the second connecting plate facing the screening plate, and the thrust plate slides in the first groove. The thrust plate can be driven to move towards the second groove.

[0011] Preferably, a first adjustment surface is provided on the inner side wall of the second chute away from the screening plate; The thrust plate has a second adjustment surface on its outer side, which cooperates with the first adjustment surface.

[0012] Preferably, it further includes a first blower disposed on one side of the screening barrel, and a first output pipe disposed on the side of the first blower near the screening barrel, the first output pipe being connected to the inside of the screening barrel.

[0013] Preferably, it further includes a recovery cylinder disposed at the bottom of the screening barrel, and a feed frame is disposed at the top of the recovery cylinder, the feed frame being connected to the inner side of the screening barrel; A third discharge pipe is provided on one side of the recycling cylinder, and a feeding hopper is provided at the top of the extruder. The third discharge pipe is located above the feeding hopper.

[0014] Preferably, a stirring rod is provided inside the recovery cylinder; A second fan is installed on the side of the recycling cylinder away from the feed frame, and the second fan is connected to the recycling cylinder through a second output pipe.

[0015] Preferably, a beating roller is provided at the bottom of the granulator, the beating roller is rotatably located on the outside of the rotating arm, and the rotating arm is rotatably located on the outside of the granulator; The top of the rotating arm is equipped with rollers, which are located on the outside of the granulator. A cam is provided on the top of the roller, and the cam is rotatably located on the outside of the granulator, and the cam can abut against the outside of the roller; A tension spring is fixedly installed on the outer side of the rotating arm, and the other end of the tension spring is fixedly installed on the outer side of the granulator. The cam is driven to rotate by an external force.

[0016] The technical solution provided by this invention has the following advantages compared with the prior art: This application utilizes a sliding fit structure between the adjustment component and the screening plate to adjust the screening gap between adjacent screening plates without replacing the screen plates, thus adapting to the screening needs of plastic particles with different particle sizes. Furthermore, the screening barrel in this application's technical solution is arranged at an angle, which, combined with the rotation of the screening plates, allows the plastic particles to form a multi-dimensional trajectory within the screening barrel, preventing particle accumulation. Simultaneously, the first fan introduces airflow into the screening barrel, which not only prevents clogging of the screening gap but also assists in separating light impurities, reducing the risk of blinding the screen openings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the extruder in an embodiment of the present invention; Figure 3 This is a schematic diagram of the assembly of the cooling tank and the granulator in an embodiment of the present invention; Figure 4 This is a schematic diagram of the assembly of the screening barrel and the recovery cylinder in an embodiment of the present invention; Figure 5 This is an exploded structural diagram of the heat exchange mechanism in an embodiment of the present invention; Figure 6 This is a schematic diagram of the stirring rod in an embodiment of the present invention; Figure 7 This is a schematic diagram of the internal structure of the screening barrel in an embodiment of the present invention; Figure 8 This is an exploded view of the fixed ring and adjusting assembly in an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of the fixing ring in an embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of the first side cover in an embodiment of the present invention; Figure 11 This is a schematic diagram of the structure of the beating roller in an embodiment of the present invention; Figure 12 This is a schematic diagram of the assembly of the heat exchange box with the first fan and the second fan in an embodiment of the present invention; Figure 13 This is a schematic diagram of the overall structure of an embodiment of the present invention from another perspective; Figure 14 This is a partial cross-sectional view of the second side cover in an embodiment of the present invention; Figure 15 For the present invention Figure 14 Enlarged view of the layout at point A in the middle.

[0019] The numbers in the diagram represent: 100, plastic strip; 1. Extruder; 11. Extrusion cylinder; 12. Extrusion die; 13. Feed hopper; 14. Base frame; 15. First support frame; 16. Second support frame; 2. Cooling tank; 21. Guide roller; 22. Water inlet pipe; 23. Water outlet pipe; 24. Inclined plate; 25. Lifting assembly; 251. Support rod; 252. Guide rail; 253. First pusher; 254. Lifting plate; 255. Connecting plate; 256. Sliding bar; 3. Granulator; 31. First discharge pipe; 32. First drive motor; 33. Chain drive box; 4. Screening barrel; 41. First side cover; 411. First air outlet; 412. Partition plate; 42. Second side cover; 421. Second discharge pipe; 43. Screening plate; 431. First chute; 44. First fixing ring; 441. First connecting ring; 45. Sliding column; 451. Second chute; 4511. First adjusting surface; 452. Sliding sleeve; 453. Elastic element; 46. Second fixing ring; 461. Connecting rod; 462. Drive column; 463. Second drive motor; 47. Adjusting assembly; 471. Third fixing ring; 472. Second connecting ring; 4721. Thrust plate; 4722. Second adjusting surface; 473. Second pushing element; 5. First fan; 51. First output pipe; 511. First conical shroud; 52. First input pipe; 6. Recycling cylinder; 61. Feeding frame; 62. Third discharge pipe; 63. Stirring rod; 64. Third drive motor; 65. Second air outlet; 651. Second conical cover; 7. Second fan; 71. Second output pipe; 711. Third conical shroud; 72. Second input pipe; 8. Heat exchange mechanism; 81. Heat exchange frame; 811. Liquid outlet pipe; 812. Liquid inlet pipe; 813. Connecting pipe; 814. Liquid inlet pipe; 82. Medium tank; 821. Liquid supply pipe; 822. Liquid return pipe; 83. Heat exchange box; 831. Liquid outlet; 832. Liquid inlet; 833. Air inlet; 834. Third air outlet; 9. Beating roller; 91. Rotating arm; 911. Roller; 92. Cam; 93. Tension spring. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] The present invention will be further described below with reference to embodiments.

[0022] Please see Figure 1 - Figure 15This invention provides a technical solution: a plastic waste recycling device, comprising an extruder 1, a cooling tank 2, a granulator 3, a screening barrel 4, and a first blower 5. The extruder 1 includes an extrusion cylinder 11, with an extrusion die 12 disposed on one side of the extrusion cylinder 11; the cooling tank 2 is disposed on one side of the extrusion die 12 for cooling plastic strips 100; the granulator 3 is disposed on top of the cooling tank 2 for granulating the cooled plastic strips 100, and a first discharge pipe 31 is disposed on one side of the granulator 3; the screening barrel 4 is inclinedly disposed on one side of the first discharge pipe 31 for granulating the plastic strips. The granules are screened. A first side cover 41 and a second side cover 42 are fixedly installed on both sides of the screening barrel 4. A second discharge pipe 421 is fixedly installed at one end of the second side cover 42 for discharging large plastic granules. A first air outlet 411 is provided on the inner side of the first side cover 41. A first fan 5 is installed on one side of the second side cover 42. A first output pipe 51 is provided on the side of the first fan 5 closest to the screening barrel 4 for blowing hot air into the screening barrel 4 to dry the plastic granules. A first conical cover 511 is provided on one side of the first output pipe 51 to prevent plastic granules from entering the first fan 5.

[0023] A guide roller 21 is rotatably installed on the inner side of the cooling tank 2, and an inlet pipe 22 and an outlet pipe 23 are respectively installed on both sides of the cooling tank 2 for connecting the external water supply pipe and the outlet pipe.

[0024] A lifting assembly 25 is provided on the outside of the cooling tank 2 to drive the granulator 3 to perform lifting actions. The lifting assembly 25 includes two support rods 251, which are fixedly installed on the top of the cooling tank 2. A guide rail 252 is fixedly installed on the side of the two support rods 251 that are close to each other. A first pusher 253 is fixedly installed on one side of the guide rail 252. A lifting plate 254 is fixedly installed at the output end of the first pusher 253. A connecting plate 255 is fixedly installed on one side of the lifting plate 254. The top of the connecting plate 255 is fixedly installed to the bottom of the granulator 3. Sliding strips 256 are fixedly installed on both sides of the connecting plate 255. The sliding strips 256 are slidably installed with the guide rail 252.

[0025] The inner side of the screening barrel 4 is arranged in a ring array with several screening plates 43. The multiple screening plates 43 surround to form a screening chamber, and a screening gap is formed between adjacent screening plates 43. The inner sides of the first side cover 41 and the second side cover 42 are both fixedly provided with a first fixing ring 44. The inner side of the first fixing ring 44 is rotatably provided with a first connecting ring 441 through a bearing. The inner side of the first connecting ring 441 is fixedly provided with a sliding column 45 corresponding to the screening plate 43. The screening plate 43 is slidably provided on the inner side of the two corresponding sliding columns 45. The ends of the multiple sliding columns 45 away from the first connecting ring 441 are jointly fixedly provided with a second fixing ring 46. The second fixing ring 46 is driven to rotate by an external force. The bottom inner side of the first side cover 41 is fixedly provided with a partition 412 to prevent plastic particles from entering the inner side of the first side cover 41.

[0026] A connecting rod 461 is fixedly installed on the inner side of one of the second fixing rings 46. A drive column 462 is fixedly installed at the end of the connecting rod 461 away from the screening plate 43. The drive column 462 is fixedly installed at the output end of the second drive motor 463. The drive column 462 passes through the first output pipe 51. The second drive motor 463 is fixedly installed on the outside of the first output pipe 51 through the connecting shell. The first fan 5 is fixedly installed on the top of the base frame 14 through the first support frame 15.

[0027] The screening plate 43 is driven by an external force to move towards the side closer to the second fixed ring 46. A sliding sleeve 452 is slidably provided on the outer side of the sliding column 45. The sliding sleeve 452 is located on the side of the screening plate 43 away from the first fixed ring 44. An elastic element 453 is provided between the sliding sleeve 452 and the second fixed ring 46. The elastic element 453 is sleeved on the outer side of the sliding column 45. The screening plate 43 is driven by the elastic element 453 to move towards the side away from the second fixed ring 46.

[0028] Both ends of the screening plate 43 are provided with first sliding grooves 431. The inner side of the sliding column 45 is provided with a second sliding groove 451 corresponding to the first sliding groove 431. The side of the second sliding groove 451 away from the screening plate 43 is provided with a first adjusting surface 4511. The two first fixing rings 44 are provided with adjusting components 47 on the sides away from each other. The adjusting components 47 include a third fixing ring 471. The inner side of the third fixing ring 471 is provided with a second connecting ring 472 rotatably arranged through a bearing. The side of the second connecting ring 472 close to the screening plate 43 is provided with a thrust plate 4721 fixedly arranged corresponding to the screening plate 43. The outer side of the thrust plate 4721 is provided with a second adjusting surface 4722. The first adjusting surface 4511 and the second adjusting surface 4722 cooperate with each other. The third fixing ring 471 is fixedly arranged at the output end of the second pushing member 473. The second pushing member 473 is fixedly arranged on the inner side corresponding to the first side cover 41 and the second side cover 42.

[0029] A recovery cylinder 6 is provided at the bottom of the screening barrel 4. The recovery cylinder 6 is inclinedly set on the top of the base frame 14 through the second support frame 16. A feed frame 61 is provided at the top of the recovery cylinder 6. The feed frame 61 is connected to the bottom of the screening barrel 4 and the inner side of the recovery cylinder 6. A third discharge pipe 62 is provided on one side of the recovery cylinder 6. A feeding hopper 13 is provided at the top of the extruder 1. The third discharge pipe 62 is located at the top of the feeding hopper 13.

[0030] A stirring rod 63 is provided inside the recycling cylinder 6. The stirring rod 63 is fixedly installed at the output end of the third drive motor 64. The stirring rod 63 is fixedly installed on the top of the base frame 14 through the second support frame 16. A second fan 7 is provided at the end of the recycling cylinder 6 away from the feed frame 61. A second output pipe 71 is provided on one side of the second fan 7. The second output pipe 71 is connected to the recycling cylinder 6 through the third conical cover 711. The second fan 7 is fixedly installed on the outside of the first support frame 15. A second air outlet 65 is provided on the side of the recycling cylinder 6 near the third drive motor 64. The second air outlet 65 is connected to the recycling cylinder 6 through the second conical cover 651.

[0031] A heat exchange mechanism 8 is provided at the bottom of the recovery cylinder 6. The heat exchange mechanism 8 includes several heat exchange frames 81, which are all sleeved on the outside of the extruder 1. Heat exchange tubes are arranged on the inner side of the heat exchange frames 81. A liquid outlet pipe 811 and a liquid inlet pipe 812 are provided at the top of the heat exchange frames 81. The liquid outlet pipe 811 and the liquid inlet pipe 812 are respectively located at both ends of the corresponding heat exchange tubes. The liquid outlet pipe 811 and the liquid inlet pipe 812 of two adjacent heat exchange frames 81 are connected by a connecting pipe 813. One end of the connecting pipe 811 is connected to the liquid inlet pipe 812. A medium tank 82 is fixedly installed on the outside of the heat exchange frame 81. A liquid supply pipe 821 is installed on the top of the medium tank 82. The liquid supply pipe 821 and the corresponding liquid outlet pipe 811 are fixedly installed. A heat exchange box 83 is fixedly installed on the top of the heat exchange frame 81. Several heat exchange boxes 83 are fixedly installed. The inner cavity of the heat exchange box 83 is wavy. Finned coils are installed inside the heat exchange box 83. Several finned coils are connected end to end. The ends of the finned coils on both sides are provided with liquid outlet 831 and liquid inlet 832.

[0032] A liquid pump is installed inside the medium tank 82. A return pipe 822 is installed at the output end of the liquid pump. One end of the return pipe 822 is fixedly installed with the liquid outlet 831. An inlet pipe 814 is fixedly installed on the inlet pipe 812 on the side away from the medium tank 82. The inlet pipe 814 is fixedly installed with the liquid outlet 832.

[0033] An air inlet 833 is provided on the outside of one end of the heat exchange box 83, and a third air outlet 834 is provided on the outside of the other end of the heat exchange box 83. The third air outlet 834 is connected to the first fan 5 and the second fan 7 through the first input pipe 52 and the second input pipe 72 respectively.

[0034] A sloping plate 24 is fixedly installed on one side of the cooling tank 2. A beating roller 9 is installed at the bottom of the granulator 3. The beating roller 9 is rotatably installed on the outside of the rotating arm 91. The rotating arm 91 is rotatably installed on the outside of the granulator 3 via a rotating shaft. A roller 911 is fixedly installed on the top of the rotating arm 91. The roller 911 is rotatably installed on the outside of the granulator 3. A cam 92 is installed on the top of the roller 911. The cam 92 is rotatably installed on the outside of the granulator 3. A tension spring 93 is fixedly installed on the outside of the rotating arm 91. The other end of the tension spring 93 is fixedly installed on the outside of the granulator 3. The cam 92 is driven to rotate by an external force.

[0035] A first drive motor 32 is fixedly installed on the outside of the granulator 3 to drive the cutting blade inside the granulator 3 to rotate. The first drive motor 32 is linked to the cam 92 through the chain transmission box 33.

[0036] The principle of plastic waste recycling equipment: First, the operator feeds the plastic waste into the hopper 13 of the extruder 1. The waste enters the extrusion cylinder 11 through the hopper 13. The heating component inside the extrusion cylinder 11 heats and melts the plastic waste. At the same time, the internal spiral conveying structure pushes the molten plastic toward the extrusion die 12. Finally, the molten plastic passes through the die hole of the extrusion die 12 to form a continuous plastic strip 100, completing the melt extrusion process. During this process, the heat exchange frame 81 in the heat exchange mechanism 8 sleeved on the outside of the extrusion cylinder 11 absorbs the residual heat emitted by the extrusion cylinder 11 through the internal heat exchange tube, providing an energy basis for subsequent hot air drying. The extruder 1 is existing technology equipment that can complete the processes of heating, conveying, and extruding plastic waste, and will not be described in detail here.

[0037] The plastic strip 100 extruded from the extrusion die 12 enters the cooling tank 2 directly. The inlet pipe 22 of the cooling tank 2 is connected to an external water supply pipe, and the outlet pipe 23 is connected to a drain pipe. Cold water continuously flows into the cooling tank 2 to form a cooling water environment. The plastic strip 100 is guided by the guide roller 21 in the cooling tank 2 and is completely immersed in the cold water to achieve rapid cooling and shaping, preventing the plastic strip 100 from deforming due to excessive temperature. After cooling, the plastic strip 100 is pulled out from the cooling tank 2. At this time, the granulator 3 is in a lower position, making it easier for the operator to put the end of the plastic strip 100 into the granulator 3.

[0038] Then the first pusher 253 is activated, and its output end pushes the lifting plate 254 to move upward along the guide rail 252. The lifting plate 254 drives the granulator 3 to rise synchronously through the connecting plate 255, so that the first discharge pipe 31 of the granulator 3 is sealed and connected with the feed end of the screening barrel 4. The sliding cooperation between the sliding strips 256 on both sides of the connecting plate 255 and the guide rail 252 ensures the stability of the lifting process.

[0039] After the first drive motor 32 on the outside of the granulator 3 starts, it drives the cutting blade to rotate at high speed through the internal transmission structure, cutting the cooled plastic strip 100 that enters the granulator 3 to form initial plastic granules. The granulator 3 is existing technology equipment that can cut the plastic strip 100, so it will not be described in detail here.

[0040] During the feeding process of granulator 3, the first drive motor 32 simultaneously drives cam 92 to rotate through chain transmission box 33. During the rotation of cam 92, it periodically squeezes the roller 911 at the top of rotating arm 91, causing rotating arm 91 to swing around the axis. With the reset action of tension spring 93, it drives the tapping roller 9 to repeatedly tap the plastic strip 100 at the outlet of cooling tank 2, knocking off the water on the outside of plastic strip 100. The water falls onto inclined plate 24 and flows back into cooling tank 2 along inclined plate 24.

[0041] The initial plastic granules produced by the granulator 3 enter the inclined screening barrel 4 through the first discharge pipe 31. At the same time, the first fan 5 starts and sends the hot air heated by the heat exchange mechanism 8 into the screening barrel 4 through the first output pipe 51. The hot air flows in the screening barrel 4 to dry the moisture on the surface of the granules and finally discharges from the first air outlet 411 of the first side cover 41. The baffle 412 can prevent plastic granules from entering the side of the baffle 412 near the first air outlet 411 when they enter the screening barrel 4. The first conical cover 511 at the end of the first output pipe 51 can effectively prevent plastic granules from entering the interior of the first fan 5 to avoid equipment blockage and damage.

[0042] Large plastic granules that meet the specifications are discharged and recycled from the second discharge pipe 421 of the second side cover 42 under the tilting action of the screening barrel 4. Small plastic granules fall through the gaps between the screening plates 43 and enter the recycling cylinder 6 through the feed frame 61. After the second fan 7 is started, hot air is sent into the recycling cylinder 6 through the second output pipe 71 and the third conical cover 711 to dry the granules a second time and further reduce the moisture content. The dried exhaust gas is discharged from the second air outlet 65 through the second conical cover 651. The third conical cover 711 and the second conical cover 651 effectively prevent plastic granules from jumping out of the recycling cylinder 6. After the third drive motor 64 is started, it drives the stirring rod 63 to rotate in the recycling cylinder 6 to stir the granules, so that the granules are in full contact with the hot air, improve the drying uniformity, and at the same time prevent the granules from accumulating and blocking in the recycling cylinder 6. The recycling cylinder 6 is tilted, and the granules finally fall into the feed hopper 13 of the extruder 1 through the third discharge pipe 62 for extrusion and recycling again.

[0043] In this process, after the liquid pump in the medium tank 82 of the heat exchange mechanism 8 is started, the heat transfer medium is sent into the heat exchange tube of the heat exchange frame 81 through the liquid supply pipe 821. After absorbing the residual heat emitted by the extrusion cylinder 11 in the heat exchange frame 81, the heat transfer medium flows through each heat exchange frame 81 in sequence through the connecting pipe 813, and is finally sent into the finned coil of the heat exchange box 83 through the liquid inlet pipe 814. At the same time, external air enters from the air inlet 833 of the heat exchange box 83, and fully contacts the finned coil in the corrugated cavity. After absorbing the heat of the heat transfer medium, it forms hot air, which is discharged from the third air outlet 834 and sent to the first fan 5 and the second fan 7 through the first input pipe 52 and the second input pipe 72 respectively to provide hot air for the drying process. After releasing heat, the heat transfer medium returns to the medium tank 82 through the liquid return pipe 822, completing the energy recovery cycle and effectively reducing the energy consumption of the equipment.

[0044] The above technical solution uses the first blower 5 to send hot air into the screening barrel 4, so that screening and drying can be carried out simultaneously. This not only removes the surface moisture of the particles, but also uses the flow of hot air to break the adhesion between the particles. The second blower 7 in the recovery barrel 6 provides secondary drying. With the stirring action of the stirring rod 63, the moisture content of the particles is reduced to a reasonable range, so as to avoid blockage or quality problems during subsequent circulation extrusion. The heat exchange frame 81 directly absorbs the waste heat of the extrusion cylinder 11, avoiding heat waste. The corrugated cavity and finned coil design of the heat exchange box 83 increases the contact area between air and heat transfer medium, improves heat exchange efficiency, and enables cold air to be efficiently converted into hot air for drying. No additional heating device is required, which reduces the energy consumption of the equipment. The design of the lifting component 25 allows the height of the granulator 3 to be flexibly adjusted, making it easier for operators to operate the end of the plastic strip 100 and reducing the difficulty of operation; The periodic tapping of the plastic strip 100 by the tapping roller 9 can initially remove the moisture from the outside of the plastic strip 100, preventing the plastic strip inside the granulator 3 from becoming too wet and ensuring smooth pelletizing.

[0045] The working method of the screening barrel 4 in the plastic waste recycling device of this application is as follows: After the second drive motor 463 is started, it drives the second fixed ring 46 to rotate through the drive column 462. The second fixed ring 46 drives the first connecting ring 441 to rotate inside the first fixed ring 44 through the sliding column 45. At the same time, the sliding column 45 drives the screening plate 43 to make a circular motion along the inner wall of the screening barrel 4 to screen the plastic particles entering the screening barrel 4. Small plastic particles that do not meet the specifications fall through the gaps between the screening plates 43, while large plastic particles that meet the specifications are discharged and recycled from the second discharge pipe 421 of the second side cover 42 under the tilting action of the screening barrel 4. The partition 412 inside the first side cover 41 can prevent plastic particles from entering the interior of the first side cover 41, so as to avoid the accumulation of particles and affect the ventilation effect of the first air outlet 411.

[0046] When the screening specifications need to be adjusted according to the recycling requirements, the second pusher 473 in the adjustment component 47 is activated. Its output end pushes the third fixed ring 471 to move towards the screening barrel 4, so that the thrust plate 4721 on the second connecting ring 472 slides in the second sliding groove 451 of the sliding column 45. The second adjustment surface 4722 of the thrust plate 4721 cooperates with the first adjustment surface 4511 on the inner side of the second sliding groove 451, pushing the screening plate 43 to move along the sliding column 45 towards the second fixed ring 46, compressing the elastic element 453 and reducing the gap between the screening plates 43. When it is necessary to increase the gap, the second pusher 473 is retracted, and the screening plate 43 moves away from the second fixed ring 46 under the elastic force of the elastic element 453. By controlling the extension amount of the second pusher 473, the gap width between the screening plates 43 can be adjusted to meet the screening requirements of different particle sizes.

[0047] It is worth noting that the above screening method has the following advantages: The second drive motor 463 drives the second fixed ring 46 to rotate through the drive column 462. The second fixed ring 46 drives the sliding column 45 of the circular array to rotate synchronously. The sliding column 45 drives the screening plate 43 to move in a circular motion along the inner wall of the screening barrel 4. During the rotation, the screening plate 43 pushes and screens the particles, ensuring the screening effect of plastic particles.

[0048] With the help of the cooperative structure of the second pusher 473, the thrust plate 4721 and the elastic member 453, the gap width between the screening plates 43 can be precisely adjusted by controlling the extension and retraction of the second pusher 473, which can meet the differentiated needs of particle size in different recycling scenarios.

[0049] The sliding sleeve 452 is located between the screening plate 43 and the second fixed ring 46. The elastic element 453 is sleeved on the sliding column 45 and its two ends act on the sliding sleeve 452 and the second fixed ring 46 respectively. The sliding sleeve 452 evenly transmits the reset elastic force of the elastic element 453 to the screening plate 43, preventing insufficient support force of the elastic element 453, realizing reliable reset of the screening plate 43, and enabling the elastic element 453 to be set away from the bottom of the screening barrel 4, so as to avoid large plastic particles getting stuck in the elastic element 453 during discharge.

[0050] By setting up a baffle 412, when plastic particles enter the screening barrel 4, they can be blocked from entering the side of the baffle 412 near the first air outlet 411. The first conical cover 511 at the end of the first output pipe 51 can guide large plastic particles that bounce onto its surface to the inside of the second discharge pipe 421, effectively preventing plastic particles from entering the inside of the first blower 5.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A plastic waste recycling device, characterized by, The utility model relates to a granulator, and particularly relates to a granulator for cooling and screening plastic particles. The granulator comprises an extruder, a cooling tank arranged on one side of the extruder and used for cooling the extruded plastic strip, a granulator arranged at the top end of the cooling tank, a first discharge pipe arranged on one side of the granulator, a screening barrel arranged on one side of the granulator in an inclined manner, the first discharge pipe being connected to the screening barrel, a plurality of screening plates arranged in the screening barrel, the plurality of screening plates being enclosed to form a screening cavity, screening gaps being formed between adjacent screening plates, the first discharge pipe being connected to the screening cavity, a second discharge pipe arranged on one side of the screening barrel, and plastic particles that pass the screening being discharged through the second discharge pipe. An adjusting assembly is arranged on one side of the screening barrel and used for adjusting the size of the screening gaps. First side covers and second side covers are arranged on two sides of the screening barrel, and first fixing rings are arranged in the first side covers and the second side covers. First connecting rings are rotatably arranged on the inner sides of the first fixing rings, sliding columns are arranged on the inner sides of the first connecting rings and correspond to the screening plates, and the screening plates are arranged to slide through the sliding columns. Second fixing rings are connected to the other ends of the sliding columns.

2. The plastic waste recycling device as claimed in claim 1, wherein, Connecting rods are fixedly arranged on the inner sides of the second fixing rings, driving columns are connected to the other ends of the connecting rods, and the driving columns drive the second fixing rings, the sliding columns and the screening plates to rotate. Elastic members are arranged between the sliding columns and the second fixing rings.

3. The plastic waste recycling device as claimed in claim 2, wherein, The screening plates move away from the second fixing rings under the action of the elastic members. First sliding grooves are arranged on one side of the screening plates, and second sliding grooves are arranged on the inner sides of the sliding columns and correspond to the first sliding grooves.

4. The plastic waste recycling device as claimed in claim 2, wherein, The adjusting assembly comprises third fixing rings arranged on the outer sides of the screening plates, second connecting rings rotatably arranged on the inner sides of the third fixing rings, and thrust plates arranged on one side of the second connecting plates and facing the screening plates, the thrust plates sliding in the first sliding grooves and moving into the second sliding grooves under the action of a driving force. First adjusting surfaces are arranged on the inner sides of the second sliding grooves and away from the side walls of the screening plates.

5. The plastic waste recycling device as claimed in claim 4, wherein, Second adjusting surfaces are arranged on the outer sides of the thrust plates and correspond to the first adjusting surfaces. A first air blower is arranged on one side of the screening barrel, a first output pipe is arranged on the side of the first air blower close to the screening barrel, and the first output pipe is connected to the screening barrel. A recovery cylinder is arranged at the bottom end of the screening barrel, an inlet frame is arranged at the top end of the recovery cylinder, and the inlet frame is connected to the inner side of the screening barrel. A third discharge pipe is arranged on one side of the recovery cylinder, and a feeding hopper is arranged at the top end of the extruder, the third discharge pipe being arranged above the feeding hopper. A stirring rod is arranged in the recovery cylinder.

6. The plastic waste recycling device as claimed in claim 5, wherein, A second air blower is arranged on one side of the recovery cylinder away from the inlet frame, and the second air blower is connected to the recovery cylinder through a second output pipe. A beating roller is arranged at the bottom end of the granulator, the beating roller is rotatably arranged on the outer side of a rotating arm, and the rotating arm is rotatably arranged on the outer side of the granulator.

7. The plastic waste recycling device as claimed in claim 1, wherein, A roller is arranged at the top of the rotating arm, the roller is rotatably arranged on the outer side of the granulator.

8. The plastic waste recycling device as claimed in claim 1, wherein, A cam is arranged on the top of the roller, the cam is rotatably arranged on the outer side of the granulator, and the cam can abut against the outer side of the roller. Tension springs are fixedly arranged on the outer side of the rotating arm, the other ends of the tension springs are fixedly arranged on the outer side of the granulator, and the cam is driven to rotate under the action of an external force.

9. The plastic waste recycling device as claimed in claim 8, wherein, ​ ​ 10. The plastic waste recycling device as claimed in claim 1, wherein, ​ ​ ​ ​

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