Remodification granulation device for waste plastics

Abstract

The invention discloses a re-modification granulation device for waste plastics, and belongs to the field of modified plastic production, the re-modification granulation device comprises a double-screw extruder, a die head is rotatably mounted on one side of the double-screw extruder, and die holes are uniformly formed in the die head; the spraying assembly comprises a first circular ring frame rotationally installed on the outer wall of the die head, nozzles are evenly and fixedly installed on one side of the first circular ring frame, the output ends of the nozzles face the die hole, a top base is fixedly installed at the top of the first circular ring frame, a water pump is fixedly installed on one side of the top of the top base, and the water pump is fixedly installed on the other side of the top of the top base. A fixed pipe is fixedly mounted at the output end of the water pump; by means of the mode that the die head is adopted to drive the extruded strip-shaped modified plastic to rotate so that cold water can be evenly sprayed around the strip-shaped modified plastic, the strip-shaped modified plastic can be cooled and solidified, the adhesion phenomenon can be reduced, the production efficiency and the product quality can be remarkably improved, and the equipment maintenance cost can be reduced.

Description

Technical Field

[0001] The present invention relates to the field of modified plastic production, and more particularly to a device for re-modifying and granulating waste plastics. Background Art

[0002] With the widespread use of plastic products, the amount of waste plastics is increasing, which has caused tremendous pressure on the environment. In order to solve this problem, the recycling and reuse of waste plastics has become one of the important topics in the field of environmental protection. Among them, converting waste plastics into high-quality recycled plastic particles through modified granulation technology is an effective way to achieve resource recycling.

[0003] Hot pelletizing (wet granulation) is a common granulation method widely used in the recycling process of waste plastics. This method usually includes steps such as melt extrusion, cutting and cooling, and is particularly suitable for producing high-quality plastic pellets. However, in the hot pelletizing (wet granulation) process, when the molten plastic contacts the cutting tool, the cooling medium (such as cold water) cannot evenly cover all the newly cut pellets, especially those close to the tool, causing local overheating. As a result, the molten modified plastic that has just been extruded from the die and cut into pellets is easy to adhere to the cutting tool. This situation will cause the plastic residue adhering to the tool to be mixed into the pellets produced subsequently, resulting in product appearance defects and unstable performance. Summary of the Invention

[0004] In response to the problems existing in the prior art, the purpose of the present invention is to provide a device for re-modifying and granulating waste plastics, which can use a die head to drive the extruded strip-shaped modified plastic to rotate so that cold water is evenly sprayed around it, thereby cooling and solidifying it and reducing the occurrence of adhesion. This method can not only significantly improve production efficiency and product quality, but also reduce equipment maintenance costs.

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] A device for reforming and granulating waste plastics comprises a twin-screw extruder, a die head is rotatably mounted on one side of the twin-screw extruder, and die holes are evenly opened on the die head;

[0007] Also includes:

[0008] Spraying assembly, the spraying assembly includes a circular ring frame one rotatably installed on the outer wall of the die head. One side of the circular ring frame one is evenly and fixedly installed with spray heads, and the output ends of each group of spray heads are all oriented towards the die holes. The top of the circular ring frame one is fixedly installed with a top seat. One side of the top of the top seat is fixedly installed with a water pump. The output end of the water pump is fixedly installed with a fixed pipe. The top of the circular ring frame one is fixedly installed with a drain pipe one. The other end of the drain pipe one penetrates through the top seat and is fixedly installed with the fixed pipe. The bottom of the twin-screw extruder is fixedly installed with a connecting plate. One side of the connecting plate is rotatably installed with a gear. The outer wall of the die head is evenly installed with teeth meshing with the gear. A pre-cooling assembly is arranged in the die head.

[0009] Further, the pre-cooling assembly includes a circular ring cavity sequentially opened in the die head from outside to inside, and a communication hole for connecting these groups. Among them, adjacent two groups of the circular ring cavities are communicated through the communication hole. One side of the innermost circular ring cavity is provided with a water outlet hole communicating with the outside. The top of the die head is provided with a water inlet hole communicating with the circular ring frame one and the outermost circular ring cavity;

[0010] The other side of the connecting plate is fixedly installed with a motor one. The output shaft of the motor one is fixedly installed with the gear. One side of the bottom of the top seat is fixedly installed with a support plate. One side of the support plate close to the die head is rotatably installed with a rotating rod. One end of the rotating rod is evenly and fixedly installed with cutting knives. Each group of cutting knives is in contact with the die head. The other side of the support plate is fixedly installed with a motor two. The output shaft of the motor two is fixedly installed with the rotating rod.

[0011] Further, a circular frame is fixedly installed on the side of the support plate away from the motor two. The rotating rod is rotatably installed with the circular frame. The top of the circular frame is fixedly installed with a drain pipe two. The other end of the drain pipe two penetrates through the top seat and is fixedly installed with the fixed pipe. A cavity is opened in the inner cavity of the rotating rod. The cavity is communicated with the inner cavity of the circular frame. One side of each group of cutting knives close to the circular frame is provided with a hollow rod. The inner cavities of each group of hollow rods are all communicated with the inner cavity of the cavity. One side of each group of hollow rods close to the cutting knife is provided with a drainage slit. Each group of drainage slits is obliquely arranged. The output direction of each group of drainage slits is all towards the cutting end of the adjacent cutting knife.

[0012] Further, a circular ring plate is rotatably installed on the side of the circular ring frame one away from the spray head. The circular ring plate is fixedly installed with the outer wall of the die head. The inner cavity of the circular ring frame one is evenly provided with stirring rods. One end of each group of stirring rods is fixedly installed with the circular ring plate.

[0013] Further, a second circular ring frame is rotatably installed on the outer wall of the die head, and the outer end of the water outlet hole faces the inner cavity of the second circular ring frame.

[0014] Further, a diversion rod is fixedly installed at the bottom of the second circular ring frame, and leakage holes are evenly formed in the bottom of the second circular ring frame. Each group of the leakage holes is arranged around the diversion rod.

[0015] Further, a collection frame is fixedly installed at the bottoms of the connecting plate and the support plate, and the bottom end of the diversion rod is fixedly installed on the bottom wall of the inner cavity of the collection frame.

[0016] Further, the length of each drainage slit is adapted to the length of the cutting knife.

[0017] Further, a partition is fixedly installed on the inner cavity wall of the collection frame, and the partition is made of heat-insulating material.

[0018] Further, the partition is arranged between the second circular ring frame and the cutting knife.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] (1) In this solution, the cold water in the first circular ring frame is sprayed on the modified plastic strips discharged from the right end of the die holes through each nozzle. With the cooperation of the rotation of the die head driven by the gear and the teeth, uniform spraying and cooling can be realized, ensuring that each modified plastic strip can be fully and evenly cooled, reducing the phenomenon of local overheating or uneven cooling. At this time, the cutting knife can stably cut and drop it, avoiding the situation that the molten modified plastic cut into particles in the past is easily adhered to the cutting knife, effectively improving the appearance quality and performance stability of the final modified plastic particle product. At the same time, this design is relatively simple, easier to maintain and clean daily, reducing the equipment complexity and potential failure points.

[0021] (2) In this solution, the water pump is used to pump cold water into the first circular ring frame, and the cold water will be discharged from the outermost circular cavity into the inner circular cavity in turn through the adjacent communication holes. At this time, the cold water will continuously flow and discharge in the die head, being able to continuously take away the heat generated by the molten modified plastic on the die head, realizing the cooling of the die head and reducing the temperature of the surface of the molten modified plastic in the die hole. A certain degree of pre-cooling is achieved before extrusion, which helps to reduce the viscosity of the modified plastic particles during cutting. At the same time, the pre-cooled molten plastic is easier to maintain its shape after extrusion, reducing the deformation or wire drawing phenomenon caused by high temperature, and thus making the finally formed particles more regular and smooth.

[0022] (3) This solution uses a water pump to draw cold water into the circular frame. The cold water will be discharged into each group of hollow rods through the cavity. The cold water in the hollow rods can be discharged through the drainage slits on them and directly sprayed on the cutting end of the cutting knife on one side and its side wall. It can quickly take away heat, reduce the temperature of the cutting knife surface, and effectively reduce the phenomenon of molten plastic adhering to the tool during the cutting process. At the same time, the design of the oblique drainage slit allows the cold water to impact the cutting end of the cutting knife at a certain angle. This not only can quickly take away the heat generated at the cutting point, but also form a "flushing" effect to help remove tiny plastic residues that may have formed, further reducing adhesion. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of the front side of the present invention;

[0024] Figure 2 It is an overall cross-sectional view of the present invention;

[0025] Figure 3 For the present invention Figure 2 A magnified view of the structure of the middle part A;

[0026] Figure 4 For the present invention Figure 2 A magnified view of the structure of the middle B section;

[0027] Figure 5 It is a combined diagram of the cutting knife and the hollow rod of the present invention;

[0028] Figure 6 For the present invention Figure 5 Enlarged view of the structure of part C in the middle.

[0029] Description of the numbers in the figure:

[0030] 1. Twin-screw extruder; 2. Die head; 3. Die hole; 4. Ring frame 1; 5. Nozzle; 6. Top seat; 7. Water pump; 8. Fixed pipe; 9. Drain pipe 1; 10. Water inlet; 11. Connecting plate; 12. Gear; 13. Teeth; 14. Motor 1; 15. Ring cavity; 16. Connecting hole; 17. Water outlet; 18. Support plate; 19. Motor 2; 20. Rotating rod; 21. Cutting knife; 22. Ring frame; 23. Cavity; 24. Hollow rod; 25. Drain slit; 26. Drain pipe 2; 27. Ring plate; 28. Stirring rod; 29. Collecting frame; 30. Ring frame 2; 31. Guide rod; 32. Leakage hole; 33. Partition. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Please refer to Figures 1 to 6 , a recycling and re-modifying granulating device for waste plastics, including a twin-screw extruder 1. A die head 2 is rotatably installed on one side of the twin-screw extruder 1, and die holes 3 are evenly formed in the die head 2;

[0033] It further includes:

[0034] A spraying assembly, which includes a circular ring frame one 4 rotatably installed on the outer wall of the die head 2. A plurality of spray heads 5 are evenly and fixedly installed on one side of the circular ring frame one 4. The output ends of each group of spray heads 5 are all directed towards the die holes 3. A top seat 6 is fixedly installed on the top of the circular ring frame one 4. A water pump 7 is fixedly installed on one side of the top of the top seat 6. The output end of the water pump 7 is fixedly installed with a fixed pipe 8. A drain pipe one 9 is fixedly installed on the top of the circular ring frame one 4. The other end of the drain pipe one 9 penetrates through the top seat 6 and is fixedly installed with the fixed pipe 8. A connecting plate 11 is fixedly installed at the bottom of the twin-screw extruder 1. A gear 12 is rotatably installed on one side of the connecting plate 11. Teeth 13 meshing with the gear 12 are evenly installed on the outer wall of the die head 2. A pre-cooling assembly is arranged in the die head 2.

[0035] The pre-cooling assembly includes a circular ring cavity 15 formed in the die head 2 from the outside to the inside in sequence, and a communication hole 16 for connecting these groups, wherein, adjacent two groups of circular ring cavities 15 are communicated through the communication hole 16, and a water outlet hole 17 communicating with the outside is formed on one side of the innermost circular ring cavity 15. An inlet hole 10 communicating with the circular ring frame one 4 and the outermost circular ring cavity 15 is formed on the top of the die head 2;

[0036] Another motor one 14 is fixedly installed on the other side of the connecting plate 11. The output shaft of the motor one 14 is fixedly installed with the gear 12. A support plate 18 is fixedly installed on one side of the bottom of the top seat 6. A rotating rod 20 is rotatably installed on the side of the support plate 18 close to the die head 2. A plurality of cutting knives 21 are evenly and fixedly installed at one end of the rotating rod 20. Each group of cutting knives 21 is in contact with the die head 2. Another motor two 19 is fixedly installed on the other side of the support plate 18. The output shaft of the motor two 19 is fixedly installed with the rotating rod 20.

[0037] First, the recycled waste plastics are pretreated and then poured into the twin-screw extruder 1 through the feed hopper on one side of the top of the twin-screw extruder 1. Then, the waste plastics are heated to a molten state by the heating system in the twin-screw extruder 1. During this process, some modifiers are added as needed to improve the material properties, and the twin-screws in the twin-screw extruder 1 will mix them, so that these waste plastics become modified plastics. Finally, the twin-screws in the twin-screw extruder 1 will convey and extrude the modified plastics in the final molten state to the right at a stable speed and state. The molten modified plastics will be extruded into each group of die holes 3 and finally discharged from the right end of the die holes 3 to form strip-shaped objects. Turn on the second motor 19. The output shaft of the second motor 19 will drive the cutting knife 21 to rotate through the rotating rod 20, and cut the strip-shaped modified plastics discharged from the right end of the die holes 3 into small segments of a fixed length, that is, the finished modified plastic particles. The above is the prior art and will not be elaborated here. During this process, turn on the water pump 7 and the first motor 14. The suction end of the water pump 7 is connected to an external cold water tank through a pipeline. The suction end of the water pump 7 will extract cold water and discharge it into the fixed pipe 8. The cold water in the fixed pipe 8 will be discharged into the first circular ring frame 4 through the first drain pipe 9. The cold water in the first circular ring frame 4 will be discharged into the outermost circular cavity 15 through the water inlet holes 10. Through the communication holes 16 connected between adjacent two groups of circular cavities 15, the cold water in the outermost circular cavity 15 will be discharged into the next inner circular cavity 15 through the communication holes 16 connected to it. Through the setting of multiple groups of communication holes 16, the cold water will be discharged from the outermost circular cavity 15 into the inner circular cavities 15 in turn through the adjacent communication holes 16. When the cold water is discharged into the innermost circular cavity 15, the cold water in the innermost circular cavity 15 will be discharged to the outside through the water outlet holes 17. At this time, the cold water will continuously flow and be discharged in the die head 2, which can continuously take away the heat generated by the molten modified plastics on the die head 2, realize the cooling of the die head 2, and reduce the temperature of the surface of the molten modified plastics in the die holes 3, and achieve a certain degree of pre-cooling before extrusion. This helps to reduce the viscosity of the modified plastic particles during cutting. At the same time, the pre-cooled molten plastic is easier to maintain its shape after extrusion, reducing the deformation or wire drawing phenomenon caused by high temperature, and thus making the finally formed particles more regular and smooth;

[0038] When the first motor 14 operates, its output shaft drives the gear 12 to rotate. The gear 12 drives the die head 2 to rotate at the right end of the twin-screw extruder 1 and inside the first circular ring frame 4 through the teeth 13. While the water pump 7 pumps cold water into the first circular ring frame 4 through the fixed pipe 8 and the first drain pipe 9, the cold water in the first circular ring frame 4 also drains into each group of nozzles 5, and is sprayed from the output ends of each group of nozzles 5 towards the inner end of the right side wall of the die head 2, so as to spray the modified plastic strips discharged from the right ends of each group of die holes 3. At this time, with the rotation of the die head 2, each group of modified plastic strips is driven to rotate on the spraying side of each group of nozzles 5, so as to evenly spray and cool them, further improving the cooling effect, ensuring that each modified plastic strip can be fully and evenly cooled, reducing the phenomenon of local overheating or uneven cooling. At this time, the cutting knife 21 can stably cut these modified plastic strips and make them fall, avoiding the situation that the molten modified plastic cut into particles in the past easily adheres to the cutting knife 21, effectively improving the appearance quality and performance stability of the final modified plastic particle product. At the same time, this design is relatively simple, easier to carry out daily maintenance and cleaning, reducing the equipment complexity and potential failure points.

[0039] As Figures 4 to 6 shown, a circular frame 22 is fixedly installed on the side of the support plate 18 away from the second motor 19. The rotating rod 20 is rotatably installed with the circular frame 22. A second drain pipe 26 is fixedly installed at the top of the circular frame 22. The other end of the second drain pipe 26 penetrates through the top seat 6 and is fixedly installed with the fixed pipe 8. A cavity 23 is opened in the inner cavity of the rotating rod 20. The cavity 23 is communicated with the inner cavity of the circular frame 22. A hollow rod 24 is arranged on the side of each cutting knife 21 close to the circular frame 22. The inner cavities of each group of hollow rods 24 are communicated with the inner cavity of the cavity 23. A drainage slot 25 is opened on the side of each group of hollow rods 24 close to the cutting knife 21. Each group of drainage slots 25 is obliquely arranged, and the output direction of each group of drainage slots 25 faces the cutting end of the adjacent cutting knife 21.

[0040] While the extraction end of the water pump 7 extracts cold water and discharges it into the fixed pipe 8, the cold water in the fixed pipe 8 will also be discharged into the inner cavity of the circular frame 22 through the second drain pipe 26. The cold water in the circular frame 22 will be discharged into each hollow rod 24 through the cavity 23. Since the number of hollow rods 24 is the same as that of the cutting knives 21, and each group of hollow rods 24 is located on one side of the adjacent cutting knife 21, the hollow rods 24 will rotate along with the cutting knives 21. When the cold water in the hollow rods 24 is discharged through the drainage slots 25 on them, it will directly spray on the cutting end and the side wall of the cutting knife 21 on one side, which can quickly take away heat and reduce the temperature on the surface of the cutting knife 21, effectively reducing the phenomenon of molten plastic adhering to the tool during the cutting process. At the same time, the design of the inclined drainage slots 25 can make the cold water impact the cutting end of the cutting knife 21 at a certain angle. In this way, not only can it quickly take away the heat generated at the cutting point, but also it can form a "flushing" effect to help remove the tiny plastic residues that may have formed, further reducing adhesion.

[0041] As Figure 3 shown, a circular ring plate 27 is rotatably installed on the side of the first circular ring frame 4 away from the nozzle 5, and the circular ring plate 27 is fixedly installed on the outer wall of the die head 2. The inner cavity of the first circular ring frame 4 is evenly provided with stirring rods 28, and one end of each group of stirring rods 28 is fixedly installed on the circular ring plate 27.

[0042] While the gear 12 drives the die head 2 to rotate through the teeth 13, the die head 2 will drive the circular ring plate 27 to move synchronously. While the circular ring plate 27 rotates on the side wall of the first circular ring frame 4, it will drive each group of stirring rods 28 to rotate in the inner cavity of the first circular ring frame 4. When the water pump 7 extracts cold water and discharges it into the first circular ring frame 4 through the fixed pipe 8 and the first drain pipe 9, each group of stirring rods 28 will rotate to stir the cold water in the first circular ring frame 4, which can improve the uniformity of the cold water temperature in the first circular ring frame 4, keep the overall cold water temperature in the first circular ring frame 4 consistent, avoid the situation of different temperatures in local areas, so that the cold water discharged into the circular cavity 15 through the water inlet holes 10 has the same temperature, effectively improving the effect of cooling the die head 2, and further effectively improving the pre-cooling efficiency of the molten modified plastic in the die holes 3, and improving the cooling efficiency of the nozzle 5 for the modified plastic strips discharged from the die holes 3.

[0043] As Figure 2 and Figure 3 shown, a second circular ring frame 30 is rotatably installed on the outer wall of the die head 2, and the outer end of the water outlet hole 17 is directly opposite to the inner cavity of the second circular ring frame 30.

[0044] A diversion rod 31 is fixedly installed at the bottom of the second circular ring frame 30, and leakage holes 32 are evenly formed at the bottom of the second circular ring frame 30, and each group of leakage holes 32 is arranged around the diversion rod 31.

[0045] A collecting frame 29 is fixedly installed at the bottom of the connecting plate 11 and the support plate 18, and the bottom end of the diversion rod 31 is fixedly installed on the inner cavity bottom wall of the collecting frame 29.

[0046] When the cold water in the first ring frame 4 is discharged into the outermost ring cavity 15 through the water inlet holes 10, due to the arrangement of the communication holes 16 in each group, the cold water will flow from the outermost ring cavity 15 to the innermost ring cavity 15 in sequence. The cold water in the innermost ring cavity 15 will be discharged through the water outlet holes 17 and sprayed into the inner cavity of the second ring frame 30. Since the second ring frame 30 surrounds the outside of the die head 2, during the rotation of the die head 2, the cold water sprayed from the water outlet holes 17 will continuously spray on the inner cavity of the second ring frame 30. The cold water in the inner cavity of the second ring frame 30 will finally flow to the inner cavity bottom wall thereof, and then flow downward through the leakage holes 32 in each group to the outer wall of the diversion rod 31. The cold water will flow downward along the outer wall of the diversion rod 31 into the inner cavity of the collecting frame 29 for collection, playing a role in guiding and collecting the water flow, and effectively improving the recycling effect.

[0047] As Figure 2 、 Figure 5 and Figure 6 shown, the length of each drainage slit 25 is adapted to the length of the cutting knife 21.

[0048] A partition 33 is fixedly installed on the inner cavity wall of the collecting frame 29, and the partition 33 is made of heat-insulating material.

[0049] The partition 33 is arranged between the second ring frame 30 and the cutting knife 21.

[0050] After the cold water pre-cools the molten modified plastic in the die holes 3, it will become hot. The heated water will flow into the inner cavity of the collecting frame 29 and be placed on the left side of the partition 33. The cold water for secondary cooling of the modified plastic strip on the right side of the die head 2 and the cut modified plastic particles will fall into the inner cavity of the collecting frame 29 and be placed on the right side of the partition 33. Through the arrangement of the partition 33, the water that becomes hot during the primary pre-cooling and the cold water for secondary cooling can be separated. At the same time, since the partition 33 is made of heat-insulating material, the water at different temperatures on both sides thereof can be blocked to prevent heat conduction.

[0051] Working principle: First, the recycled waste plastics are poured into the twin-screw extruder 1 after pretreatment, and a modifier is added. The twin-screw extruder 1 will heat and melt the waste plastics inside it, and mix them into molten modified plastics through the twin-screws, and convey and extrude them to the die hole 3 to the right. Turn on the first motor 14, and drive the die head 2 to rotate through the cooperation of the gear 12 and the tooth 13. Turn on the water pump 7 to pump cold water and discharge it into the first circular frame 4 through the first drain pipe 9. The die head 2 will drive the stirring rod 28 to rotate to stir the cold water in the first circular frame 4 evenly. The cold water in the first circular frame 4 will be discharged from the outermost circular cavity 15 into the innermost circular cavity 15 through the water inlet hole 10, which can realize the pre-cooling of the molten modified plastics in the die hole 3. The water in the innermost circular cavity 15 will be discharged into the second circular frame 30 through the water outlet hole 17 and fall into the collection frame 29, which is placed on the left side of the partition plate 33. When the molten modified plastics in the die hole 3 are discharged from the die hole 3, they will form strip-shaped modified plastics. When the cold water in the first circular frame 4 is discharged through the nozzle 5, it will spray and cool these rotating strip-shaped modified plastics for the second time. Turn on the second motor 19, and drive the cutting knife 21 to rotate through the rotating rod 20 to cut the strip-shaped modified plastics into modified plastic particles. The water pump 7 pumping cold water will also be discharged into the circular frame 22 through the second drain pipe 26. The cold water will be discharged into the hollow rod 24 through the cavity 23, and finally sprayed on the cutting end of the cutting knife 21 through the drain slit 25 to prevent residues on the cutting knife 21. The cold water for the second cooling on the right side of the die head 2 and the modified plastic particles will fall into the collection frame 29 and be placed on the right side of the partition plate 33. When it is necessary to take out the modified plastic particles in the collection frame 29, use tools to filter and fish out the modified plastic particles.

[0052] The above is only the preferred specific implementation manner of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, makes equivalent replacements or changes, and should be covered by the protection scope of the present invention.

Claims

1. A recycled modified granulation device for waste plastics, including a twin-screw extruder (1), a die head (2) is rotatably installed on one side of the twin-screw extruder (1), and die holes (3) are evenly formed in the die head (2); It is characterized in that: It further includes: A spraying component, the spraying component includes a circular ring frame one (4) rotatably installed on the outer wall of the die head (2), a spray head (5) is evenly and fixedly installed on one side of the circular ring frame one (4), the output ends of each group of spray heads (5) are all oriented towards the die holes (3), a top seat (6) is fixedly installed on the top of the circular ring frame one (4), a water pump (7) is fixedly installed on one side of the top of the top seat (6), the output end of the water pump (7) is fixedly installed with a fixed pipe (8), a drain pipe one (9) is fixedly installed on the top of the circular ring frame one (4), the other end of the drain pipe one (9) penetrates through the top seat (6) and is fixedly installed with the fixed pipe (8), a connecting plate (11) is fixedly installed at the bottom of the twin-screw extruder (1), a gear (12) is rotatably installed on one side of the connecting plate (11), and teeth (13) meshing with the gear (12) are evenly installed on the outer wall of the die head (2), and a pre-cooling component is arranged in the die head (2).

2. The recycling and re-modifying granulation device for waste plastics according to claim 1, wherein: The pre-cooling component includes a circular ring cavity (15) formed in the die head (2) from outside to inside in sequence, and a communication hole (16) for connecting these groups, wherein, adjacent two groups of circular ring cavities (15) are communicated through the communication hole (16), a water outlet hole (17) communicating with the outside is formed on one side of the innermost circular ring cavity (15), and a water inlet hole (10) communicating with the circular ring frame one (4) and the outermost circular ring cavity (15) is formed on the top of the die head (2); Another side of the connecting plate (11) is fixedly installed with a motor one (14), the output shaft of the motor one (14) is fixedly installed with the gear (12), a support plate (18) is fixedly installed on one side of the bottom of the top seat (6), a rotating rod (20) is rotatably installed on the side of the support plate (18) close to the die head (2), a cutting knife (21) is evenly and fixedly installed at one end of the rotating rod (20), each group of cutting knives (21) is in contact with the die head (2), and a motor two (19) is fixedly installed on the other side of the support plate (18), and the output shaft of the motor two (19) is fixedly installed with the rotating rod (20).

3. The re-modifying granulation device for waste plastics according to claim 2, wherein: On the side of the support plate (18) away from the second motor (19), a circular frame (22) is fixedly installed. The rotating rod (20) is rotatably installed with the circular frame (22). At the top of the circular frame (22), a second drain pipe (26) is fixedly installed. The other end of the second drain pipe (26) penetrates through the top seat (6) and is fixedly installed with the fixed pipe (8). A cavity (23) is formed in the inner cavity of the rotating rod (20), and the cavity (23) is communicated with the inner cavity of the circular frame (22). On the side of each cutting knife (21) close to the circular frame (22), a hollow rod (24) is provided. The inner cavities of the hollow rods (24) are all communicated with the inner cavity of the cavity (23). On the side of each hollow rod (24) close to the cutting knife (21), a drainage slit (25) is formed. Each drainage slit (25) is obliquely arranged, and the output direction of each drainage slit (25) faces the cutting end of the adjacent cutting knife (21).

4. A recycling and re-modifying granulating device for waste plastics according to claim 1, characterized in that: On the side of the first circular ring frame (4) away from the nozzle (5), a circular ring plate (27) is rotatably installed. The circular ring plate (27) is fixedly installed on the outer wall of the die head (2). In the inner cavity of the first circular ring frame (4), stirring rods (28) are evenly arranged. One end of each stirring rod (28) is fixedly installed with the circular ring plate (27).

5. The re-modifying granulation device for waste plastics according to claim 2, wherein: On the outer wall of the die head (2), a second circular ring frame (30) is rotatably installed. The outer end of the water outlet hole (17) faces the inner cavity of the second circular ring frame (30).

6. The re-modifying granulating device for waste plastics according to claim 5, wherein: At the bottom of the second circular ring frame (30), a guide rod (31) is fixedly installed. At the bottom of the second circular ring frame (30), leakage holes (32) are evenly formed. Each leakage hole (32) is arranged around the guide rod (31).

7. The re-modifying granulating device for waste plastics according to claim 6, characterized in that: A collecting frame (29) is fixedly installed at the bottom of the connecting plate (11) and the support plate (18). The bottom end of the guide rod (31) is fixedly installed on the bottom wall of the inner cavity of the collecting frame (29).

8. The recycling and re-modifying granulating device for waste plastics according to claim 3, characterized in that: The length of each drainage slit (25) is adapted to the length of the cutting knife (21).

9. The re-modifying granulation device for waste plastics according to claim 7, wherein: On the inner cavity wall of the collecting frame (29), a partition plate (33) is fixedly installed. The partition plate (33) is made of heat-insulating material.

10. The recycling and re-modifying granulation device for waste plastics according to claim 9, wherein: The partition plate (33) is arranged between the second circular ring frame (30) and the cutting knife (21) in the vertical direction.

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