Granule pumping machine for waste recovery and grain pumping method of grain pumping machine

Abstract

The invention discloses a grain pumping machine for waste recycling and a grain pumping method thereof, and relates to the field of grain pumping machines, the grain pumping machine comprises a base, a melting mechanism, a grain cutting mechanism and a cooling tank, a sponge roller assembly is arranged in the cooling tank, a stepping motor is arranged on one side of the cooling tank, an adjusting disc matched with the sponge roller assembly is rotationally arranged in the cooling tank, and the sponge roller assembly is arranged on the base. And two sets of vertical rollers are symmetrically arranged on the top of the adjusting disc in an inclined mode, a supporting frame is arranged on the side, away from the adjusting disc, of the cooling tank, and an outer cylinder is installed in the supporting frame. Plastic strips between the vertical rollers can be driven by the vertical rollers to rotate and move, so that the moving path of the plastic strips in the cooling groove can be prolonged, when the spray heads are flush with the through holes in the inner barrel, high-temperature drying gas can be sprayed to the outer walls of the plastic strips, and when the spray heads are located in the middle of the two sets of through holes, the plastic strips can be dried. And high-temperature drying gas can spread towards the through holes in the two sides, and all-around drying work on the plastic strips is achieved.

Description

Technical Field

[0001] This invention relates to the field of pelletizers, specifically to a pelletizer for waste recycling and its pelletizing method. Background Technology

[0002] A pelletizer, commonly known as a "plastic pelletizer," is a core piece of equipment in the field of plastic recycling and regeneration. Its main function is to process various waste plastics (such as plastic bottles, plastic films, and plastic scraps) or plastic raw materials through a series of physical processes into uniform plastic pellets (referred to in the industry as "recycled plastic pellets" or "plastic masterbatches"), so that they can be reused in the production of plastic products. Essentially, it is a production line that transforms "waste, raw plastics" into "standardized industrial raw materials," and it is a key link in realizing the circular utilization of plastic resources.

[0003] Existing pelletizing machines involve the following operational steps: raw material pretreatment, feeding and melting, filtering and extrusion, cooling and cutting, screening and packaging. When a single-screw pelletizer extrudes a plastic strip from the extruder head, the operator moves the strip by hand within a cooling tank before it is discharged into the pelletizing assembly. A large amount of cooling water is circulated through the cooling tank. To prevent moisture from entering the pelletizing assembly as the plastic strip moves to one side, a drying mechanism is typically installed between the pelletizing assembly and the cooling mechanism. During the sideways movement of the plastic strip, it undergoes high-temperature drying by the drying mechanism. While the drying process uses a warm air drying system, the drying unit itself is relatively small, resulting in a short time for the plastic strips to pass through it. Furthermore, the drying component blows air from top to bottom, which means the bottom of the plastic strips may not be fully dried, affecting the overall drying effect. Additionally, the plastic strips may carry water droplets as they slide out of the cooling water. If these droplets are not cleaned promptly, drying them is time-consuming and energy-intensive, impacting subsequent pelletizing. Moreover, to improve the overall cooling effect, the cooling tank is usually lengthened during the cooling process, which increases the overall footprint, thereby increasing production costs and subsequent maintenance burden.

[0004] In summary, the bottom of the plastic strip cannot be completely dried during the actual production process, which affects the overall drying effect. In order to improve the overall cooling effect, the length of the cooling tank is usually increased, which makes the overall footprint larger, thereby increasing the overall production cost and subsequent maintenance burden. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a pelletizer and pelletizing method for waste recycling, so as to solve the technical problem that the bottom of the plastic strip cannot be completely dried in the actual production process, and that lengthening the cooling tank will increase the overall production cost and subsequent maintenance burden.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a pelletizer for waste recycling, comprising a base, a melting mechanism, a pelletizing mechanism, and a cooling tank. The melting mechanism is provided on one side of the top of the base, and the pelletizing mechanism is provided on the other side. A cooling tank is provided between the melting mechanism and the pelletizing mechanism. A sponge roller assembly is provided in the cooling tank, and a stepper motor for driving the sponge roller assembly to rotate is provided on one side of the cooling tank. An adjusting plate that cooperates with the sponge roller assembly is rotatably provided in the cooling tank, and two sets of vertical rollers are obliquely symmetrically arranged on the top of the adjusting plate. A support frame is provided on the side of the cooling tank away from the regulating plate. An outer cylinder is installed inside the support frame, and an inner cylinder is rotatably installed inside the outer cylinder. An array of nozzles is provided on the inner wall of the outer cylinder, and a through hole is provided through the inner cylinder. Impellers are provided at both ends of the inner cylinder, and a water inlet is provided on one side of the cooling tank at the impeller.

[0007] By adopting the above technical solution, the sponge roller assembly can effectively prevent water droplets from adhering to the plastic strips to be dried. At the same time, the adjustment plate in the cooling tank is rotated by the transmission assembly. At this time, the vertical roller will drive the plastic strips to rotate and move, thereby extending the movement path of the plastic strips in the cooling tank. When the nozzle is flush with the through hole on the inner cylinder, the high-temperature drying gas will be sprayed onto the outer wall of the plastic strip. When the nozzle is in the middle position of the two sets of through holes, the high-temperature drying gas will be blown onto the outer wall of the inner cylinder and then spread to the through holes on both sides, realizing the all-round drying of the plastic strips.

[0008] The invention is further configured such that an array of slots are provided at both ends of the inner cylinder, wherein the slots are located inside the outer cylinder, the bottom of the outer cylinder is smooth, and an array of drainage holes are provided at the bottom.

[0009] Preferably, when the high-temperature drying gas dries the moisture on the plastic strip, it will vaporize due to the high temperature. At this time, the vaporized water vapor will spread to both sides and then float upward through the slot to the inner wall of the outer cylinder. Due to the temperature difference between the inner and outer walls of the outer cylinder caused by the water vapor, some of the water vapor will liquefy and then move downward through the inner wall of the outer cylinder to the drain at the bottom. This process can reduce the secondary liquefaction of water vapor at the inlet and outlet, effectively reducing the impact on the subsequent drying effect on the plastic strip.

[0010] The present invention is further configured such that the melting mechanism includes a pusher motor, a barrel, a melting chamber and an extrusion head, the top of the base is provided with a melting chamber, one end of the melting chamber is provided with a pusher motor and an extrusion head, and the top of the melting chamber is also provided with a barrel.

[0011] Preferably, the waste material is uniformly discharged into the bottom barrel, and then the pusher motor on one side is started. During this process, the pusher motor drives the screw to rotate, causing the waste material in the barrel to be discharged into the melting chamber. The screw rotates at high speed in the melting chamber, and the plastic is gradually melted and plasticized by friction and external heating to form a uniform plastic melt. Then, plastic strips are extruded through the extrusion head, thereby completing the melting of the waste material.

[0012] The present invention is further configured such that the pelletizing mechanism includes a pelletizer, a buffer support and a feed inlet, wherein the bottom of the pelletizer is provided with a buffer support, and the feed inlet is provided on the side of the pelletizer near the support frame.

[0013] Preferably, the dried plastic strips are fed into the pelletizer through the feed inlet by the traction mechanism. The pelletizing blades quickly cut the plastic strips into plastic pellets, which facilitates subsequent packaging by the staff. At the same time, the buffer bracket reduces the vibration of the pelletizer itself and ensures the stability of the overall pelletizing process.

[0014] The present invention is further configured such that the sponge roller assembly includes two sets of sponge rollers, the sponge rollers themselves are arranged symmetrically at the top and bottom, and the outer surface of the bottom sponge roller is provided with a horizontal surface.

[0015] Preferably, under normal conditions, the horizontal plane on the bottom sponge roller is set upwards, which creates a certain gap between the bottom sponge roller and the upper sponge roller, ensuring that the plastic particles can stably pass through the sponge roller assembly. When the stepper motor drives the bottom sponge roller to rotate, its horizontal plane tilts to one side. At this time, the two sets of sponge rollers come into contact with each other and squeeze the plastic strip, ensuring that large water droplets do not adhere to the plastic particles passing through the sponge roller.

[0016] The present invention is further configured such that a heating component is provided on one side of the cooling tank on the base, wherein one end of the heating component is connected to a heat transfer pipe, and the other end of the heat transfer pipe is connected to a nozzle inside the outer cylinder.

[0017] Preferably, by using a heating component in conjunction with a heat transfer tube, the high-temperature gas inside can be ejected through a nozzle. The heating component can adjust the temperature of the gas according to the material of the plastic strip, ensuring that it is suitable for drying various plastic strips and improving the overall practicality of the device.

[0018] The present invention is further configured such that one end of the sponge roller assembly passes through the cooling groove and is connected to a transmission mechanism, wherein the other end of the transmission mechanism is connected to a spur bevel gear, and a side bevel gear meshes with the spur bevel gear on one side of the spur bevel gear, and the top of the side bevel gear passes through the cooling groove and is connected to the bottom of the adjusting plate.

[0019] Preferably, when the stepper motor drives the sponge roller assembly to rotate for adjustment, the transmission mechanism on the outer wall of its cooling tank will rotate accordingly, thereby driving the positive bevel gear to rotate. During this process, under the meshing with the side bevel gear, the adjustment disc will rotate and adjust accordingly.

[0020] The present invention is further configured such that a drain outlet is provided on one side of the cooling tank near the melting mechanism, and a pressure roller is provided inside the cooling tank.

[0021] Preferably, the water inlet and outlet are respectively located at both ends of the cooling tank, so that the water flow direction is opposite to the conveying direction of the plastic strip to ensure the overall cooling effect. This arrangement ensures that the water temperature at the melting mechanism is higher than that on the other side, preventing the plastic strip from cracking due to the high temperature difference when it enters the cooling tank. Furthermore, the pressure roller ensures that the plastic strip enters the cooling tank below the surface of the cooling water, further improving the cooling effect on the plastic strip.

[0022] The present invention is further configured such that an external cooling circulation system is connected to the ports of the water inlet and the water outlet.

[0023] Preferably, by setting up a cooling water circulation system, the water source in the cooling tank is kept in a flowing state, ensuring the overall cooling efficiency. Furthermore, the circulating cooling water can keep the water temperature in the cooling tank constant for a long time, further improving the overall cooling effect.

[0024] A pelletizing method for waste recycling includes the following steps: Step 1: The recycled waste plastic is sorted to remove impurities such as metal, paper, and cloth. Then it is cut into small pieces by a crusher, washed to remove oil and dust, and moisture is removed to prevent air bubbles from forming during granulation. Step 2: The pre-treated plastic pieces are fed into the screw extruder of the pelletizer by the feeder. The screw rotates at high speed in the barrel, and the plastic is gradually melted and plasticized by friction and external heating to form a uniform plastic melt. The molten plastic melt is filtered through a filter screen to further remove fine impurities, and then extruded through the extrusion head of the die head to form a continuous plastic strip. Step 3: The plastic strip is cooled and shaped in a cooling tank, then fully cooled by the cooperation of an adjusting plate and vertical rollers, and conveyed into an inner cylinder on one side. Through the cooperation of nozzles and through holes, the outer surface is initially dried. The strip is then fed into the pelletizing mechanism at a uniform speed by a traction machine, where it is cut into plastic pellets of uniform length. The pellets are then fully dried at high temperature to remove water molecules from the inside of the pellets. The cut pellets are then screened by a vibrating screen to remove fragments and unqualified pellets. Finally, they are bagged by a packaging machine to become recycled plastic raw materials that can be directly used for production.

[0025] By adopting the above technical solution, the plastic strip can be fully cooled without increasing the volume of the cooling tank, saving a lot of cooling costs, and the plastic strip can be dried in all directions to ensure the pelletizing effect of the subsequent pelletizing mechanism.

[0026] In summary, the present invention has the following main beneficial effects: 1. This invention features a sponge roller assembly within a cooling tank, with the outer wall of the bottom sponge roller positioned horizontally. When a plastic strip is extruded from the extruder, the worker passes it between two sets of sponge rollers. This sponge roller assembly effectively prevents water droplets from adhering to the plastic strip to be dried, ensuring optimal drying results. Simultaneously, as the bottom sponge roller rotates, a transmission assembly causes the adjusting disc within the cooling tank to rotate. This, in turn, causes the vertical roller to rotate and move the plastic strip, extending its path within the cooling tank. This allows for thorough cooling of the plastic strip without increasing the tank's volume, significantly reducing cooling costs. 2. This invention features an inner cylinder that rotates at the inlet of the cooling tank. The plastic strip, after passing through the sponge roller assembly, passes through the inner cylinder. Since the inner wall of the outer cylinder is equipped with an array of nozzles, when the nozzles are flush with the through holes on the inner cylinder, high-temperature drying gas is sprayed onto the outer wall of the plastic strip. Because the inner cylinder rotates at the inlet via an impeller, during the rotation of the inner cylinder, when the nozzles are in the middle position between the two sets of through holes, the high-temperature drying gas is blown onto the outer wall of the inner cylinder, then spreads to the through holes on both sides, and sprays onto other parts of the plastic strip. This process achieves all-round drying of the plastic strip, ensuring the pelletizing effect of the subsequent pelletizing mechanism. 3. This invention features an array of slots on the inner cylinder, located inside the outer cylinder. When the high-temperature drying gas dries the moisture on the plastic strip, it vaporizes due to the high temperature. The vaporized water vapor spreads to both sides and then rises through the slots to the inner wall of the outer cylinder. Due to the temperature difference between the inner and outer walls of the outer cylinder caused by the water vapor, some of the water vapor liquefies and then moves downwards through the inner wall of the outer cylinder to the drain outlet at the bottom. This process reduces secondary liquefaction of water vapor at the inlet and outlet, effectively reducing the impact on the subsequent drying effect on the plastic strip. Attached Figure Description

[0027] Figure 1 This is a perspective view of the present invention; Figure 2 This is a side view of the present invention; Figure 3 This is a schematic diagram of the raw material melting mechanism of the present invention; Figure 4 This is a schematic diagram of the cooling mechanism structure of the present invention; Figure 5 This is a schematic diagram of the pelletizing mechanism of the present invention; Figure 6 This is a schematic diagram of the transmission mechanism structure of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of A in the middle; Figure 8 This is a schematic diagram of the structure of the extended plastic strip cooling path according to the present invention; Figure 9 This is a schematic diagram of the drying mechanism of the present invention; Figure 10 This is a schematic diagram of the nozzle through-hole of the present invention in a flush state; Figure 11 This is a schematic diagram of the structure of the nozzle through hole in the misaligned state of the present invention; Figure 12 For the present invention Figure 11 Enlarged view of B in the middle; Figure 13 This is an exploded view of the drying mechanism of the present invention.

[0028] Explanation of reference numerals in the attached figures: 1. Base; 2. Melting mechanism; 201. Pusher motor; 202. Material cylinder; 203. Melting chamber; 204. Extruder head; 3. Pelletizing mechanism; 301. Pelletizer; 302. Buffer support; 303. Feed inlet; 4. Cooling tank; 5. Water inlet; 6. Heating component; 7. Support frame; 8. Impeller; 9. Transmission mechanism; 10. Sponge roller assembly; 11. Drain outlet; 12. Pressure roller; 13. Vertical roller; 14. Outer cylinder; 15. Heat transfer tube; 16. Stepper motor; 17. Positive bevel gear; 18. Side bevel gear; 19. Nozzle; 20. Slotted; 21. Through hole; 22. Adjusting disc; 23. Inner cylinder. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0030] The embodiments of the present invention will now be described.

[0031] Example 1: Please refer to Figures 1-13The waste recycling pelletizer and its pelletizing method are shown, including a base 1, a melting mechanism 2, a pelletizing mechanism 3, a cooling tank 4, a transmission mechanism 9, a drying mechanism, and a cooling mechanism. The melting mechanism 2 can melt the waste, and then the plastic strip to be cooled is extruded through the extrusion head 204 at one end. At this time, the operator moves the plastic strip in the cooling water of the cooling tank 4 by holding one end of the plastic strip. Two sets of pressure rollers 12 are rotated in the cooling tank 4. The pressure rollers 12 can keep the plastic strip at the bottom and prevent the plastic strip from floating to the surface of the liquid in the cooling tank 4 during the conveying process, so as to ensure the overall cooling effect. At the same time, a sponge roller assembly 10 is provided in the cooling tank 4. The sponge roller assembly 10 includes two sets of sponge rollers. The sponge rollers themselves are arranged symmetrically on the top and bottom, and the outer surface of the bottom sponge roller is provided with a horizontal surface. In normal conditions, the horizontal plane of the bottom sponge roller is set upward, which creates a certain gap between the bottom sponge roller and the upper sponge roller, ensuring that the plastic granules can stably pass through the sponge roller assembly 10. An adjustment plate 22 that cooperates with the sponge roller assembly 10 is rotatably installed in the cooling tank 4. Two sets of vertical rollers 13 are obliquely symmetrically arranged on the top of the adjustment plate 22. In the initial state, the vertical rollers 13 are close to the middle position of the cooling tank 4. At this time, the plastic strip can enter the inner cylinder 23 through the vertical rollers 13 and the sponge roller assembly 10, and then enter the pelletizing mechanism 3. During operation, the traction mechanism of the pelletizing mechanism 3 will drive the plastic strip to move. At this time, the operator starts the stepper motor 16 on one side of the cooling tank 4. When the stepper motor 16 drives the bottom sponge roller to rotate, its horizontal plane tilts to one side. At this time, the two sets of sponge rollers contact each other and squeeze the plastic strip, ensuring that large water droplets do not adhere to the plastic granules passing through the sponge roller. Furthermore, as the stepper motor 16 drives the sponge roller assembly 10 to rotate, its adjustment disk 22 will also rotate accordingly. At this time, the vertical roller 13 will drive the plastic strip between them to rotate and move, thereby extending the movement path of the plastic strip in the cooling tank 4. This allows the plastic strip to be fully cooled without increasing the volume of the cooling tank 4, saving a lot of cooling costs. After cooling, the plastic strip passes through the sponge roller assembly 10 to remove water droplets and then moves to the inside of the inner cylinder 23. A support frame 7 is provided on the side of the cooling tank 4 away from the adjustment disk 22. An outer cylinder 14 is installed inside the support frame 7, and an inner cylinder 23 is rotatably installed inside the outer cylinder 14. An array of nozzles 19 is provided on the inner wall of the outer cylinder 14, and a through hole 21 is provided through the inner cylinder 23. A heating component 6 is installed on one side of the cooling tank 4 on the base 1. One end of the heating component 6 is connected to a heat transfer pipe 15, and the other end of the heat transfer pipe 15 is connected to a nozzle 19 inside the outer cylinder 14. Through the heating component 6 and the heat transfer pipe 15, the high-temperature gas inside can be sprayed out through the nozzle 19. When the nozzle 19 is flush with the through hole 21 on the inner cylinder 23, the high-temperature drying gas will be sprayed directly onto the outer wall of the plastic strip. Since the inner cylinder 23 is equipped with impellers 8 at both ends, and the cooling tank 4 is equipped with a water inlet 5 at the impeller 8 on one side, the impeller 8 will rotate in the inner cylinder 23 during the water inlet 5 process. When the nozzle 19 is in the middle position of the two sets of through holes 21, the high-temperature drying gas will be blown onto the outer wall of the inner cylinder 23, and then spread to the through holes 21 on both sides and sprayed onto other parts of the plastic strip. In this process, the plastic strip is dried in all directions to ensure the pelletizing effect of the subsequent pelletizing mechanism 3.

[0032] For details regarding the above embodiments, please refer to [link / reference]. Figure 3 and Figure 5 The melting mechanism 2 includes a pusher motor 201, a barrel 202, a melting chamber 203, and an extrusion head 204. The melting chamber 203 is located on the top of the base 1. The pusher motor 201 and the extrusion head 204 are located at one end of the melting chamber 203, and the barrel 202 is located on the top of the melting chamber 203. By uniformly discharging the waste material into the barrel 202 at the bottom, the pusher motor 201 on one side is started. During this process, the pusher motor 201 drives the screw to rotate, so that the waste material in the barrel 202 is discharged into the melting chamber 203. The screw rotates at high speed in the melting chamber 203, and the plastic is gradually melted and plasticized by friction and external heating to form a uniform plastic melt. Then, the plastic strip is extruded through the extrusion head, thereby completing the melting of the waste material. Furthermore, the pelletizing mechanism 3 includes a pelletizer 301, a buffer support 302, and a feed inlet 303. The buffer support 302 is provided at the bottom of the pelletizer 301. The feed inlet 303 is provided on the side of the pelletizer 301 near the support frame 7. The dried plastic strips will enter the interior of the pelletizer 301 through the feed inlet 303 via the traction mechanism. The plastic strips will be quickly cut into plastic pellets by the pelletizing blade, which will facilitate subsequent packaging by the staff. At the same time, the buffer support 302 reduces the vibration of the pelletizer 301 itself and ensures the stability of the overall pelletizing.

[0033] For details regarding the above embodiments, please refer to [link / reference]. Figure 7One end of the sponge roller assembly 10 passes through the cooling tank 4 and is connected to a transmission mechanism 9. The other end of the transmission mechanism 9 is connected to a spur bevel gear 17, and a side bevel gear 18 is meshed on one side of the spur bevel gear 17. The top of the side bevel gear 18 passes through the cooling tank 4 and is connected to the bottom of the adjustment disk 22. When the stepper motor 16 drives the sponge roller assembly 10 to rotate for adjustment, the transmission mechanism 9 on the outer wall of the cooling tank 4 will rotate accordingly, thereby driving the spur bevel gear 17 to rotate. During this process, under the meshing with the side bevel gear 18, the adjustment disk 22 will rotate accordingly for adjustment.

[0034] For details regarding the above embodiments, please refer to [link / reference]. Figure 7 The cooling tank 4 has a drain outlet 11 located on one side near the melting mechanism 2. The water inlet 5 and the drain outlet 11 are respectively located at both ends of the cooling tank 4, so that the water flow direction is opposite to the conveying direction of the plastic strip to ensure the overall cooling effect. This arrangement ensures that the water temperature at the melting mechanism 2 is higher than that on the other side, preventing the plastic strip from cracking due to the high temperature difference when it enters the cooling tank 4. The inlet 5 and the drain outlet 11 are connected to an external cooling circulation system. The cooling water circulation system ensures that the water in the cooling tank 4 is in a flowing state, ensuring the overall cooling efficiency. The circulating cooling water also keeps the water temperature in the cooling tank 4 constant for a long time, further improving the overall cooling effect.

[0035] Example 2: Please refer to Figure 10 , Figure 11 and Figure 13 The diagram illustrates a waste recycling pelletizer and its pelletizing method. An array of slots 20 are provided at both ends of the inner cylinder 23, located inside the outer cylinder 14. The bottom of the outer cylinder 14 is smooth and has an array of drainage holes. When high-temperature drying gas dries the moisture on the plastic strips, the vapors evaporate due to the high temperature. The vaporized water vapor spreads to both sides and then rises through the slots 20 to the inner wall of the outer cylinder 14. Due to the temperature difference between the inner and outer walls of the outer cylinder 14 caused by the water vapor, some of the water vapor liquefies and then flows downwards through the inner wall of the outer cylinder 14 to the drain outlet at the bottom. This process reduces secondary liquefaction of water vapor at the inlet and outlet, effectively reducing the impact on the subsequent drying effect on the plastic strips.

[0036] For details regarding the above embodiments, please refer to [link / reference]. Figure 10The support frame 7 is made of copper, which has good thermal conductivity. Since the support frame 7 is located at the bottom of the cooling tank 4, when the cooling water in the cooling tank 4 circulates, the support frame 7 will conduct the temperature of the cooling water to the outer wall of the outer cylinder 14, ensuring the liquefaction effect of the inner water vapor in the outer cylinder 14 and improving the overall practicality.

[0037] In practical operation, the present invention is used as follows: after the waste plastic is crushed and impurities are removed, it is fed into the material cylinder 202. Then, with the cooperation of the pusher motor 201 and the screw, the plastic is sent into the melting chamber 203. After being melted at high temperature, it is extruded into the extrusion head 204. The extruded plastic strip passes through the cooling water in the cooling tank 4 and passes through the sponge roller assembly 10. In this state, the horizontal plane of the sponge roller assembly 10 is at the top, which facilitates the stable passage of the plastic strip. Then, it passes through the inner cylinder 23 and contacts the feed port 303 on the pelletizing mechanism 3. At this time, the operator drives the sponge roller below the sponge roller assembly 10 to rotate through the stepper motor 16, so that the horizontal plane is rotated to the bottom, so that the two sets of sponge rollers remove water from the plastic strip, effectively preventing larger water droplets from adhering to the plastic strip and entering the drying mechanism. During the adjustment of the sponge roller assembly 10, the adjustment disk 22 in the cooling tank 4 rotates at a certain angle with the cooperation of the transmission assembly. Since the vertical rollers 13 are obliquely symmetrically arranged on the adjustment disk 22, in the initial state the vertical rollers 13 are close to the middle position of the cooling tank 4, at which time the plastic strip can pass directly through both. During subsequent adjustment, the adjustment disk 22 will drive the vertical rollers 13 to rotate. At this time, the plastic strip follows the vertical rollers 13 to rotate and move, thereby extending the movement path of the plastic strip in the cooling tank 4, so as to complete the full cooling of the plastic strip without increasing the volume of the cooling tank 4. After being dehydrated, the plastic enters the inner cylinder 23. At this time, the heating component 6, in conjunction with the heat transfer tube 15, sprays its high-temperature gas through the nozzle 19. When the nozzle 19 inside the outer cylinder 14 is flush with the through hole 21 on the inner cylinder 23, the nozzle 19 directly sprays its high-temperature gas onto the plastic strip. Since impellers 8 are provided at both ends of the inner cylinder 23, during the process of water entering through the inlet 5, the impellers 8 will drive the inner cylinder 23 to rotate. When the nozzle 19 is misaligned with the through hole 21 on the inner cylinder 23, and the nozzle 19 is in the middle position of the two sets of through holes 21, the high-temperature drying gas will blow towards the outer wall of the inner cylinder 23, and then spread to the through holes 21 on both sides, and spray onto other parts of the plastic strip. In this process, the plastic strip is dried in all directions during its movement, ensuring the effect of the subsequent pelletizing mechanism 3 on pelletizing.

[0038] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A pelletizer for waste recycling, comprising a base (1), a melting mechanism (2), a pelletizing mechanism (3), and a cooling tank (4), wherein the melting mechanism (2) is provided on one side of the top of the base (1), and the pelletizing mechanism (3) is provided on the other side, wherein a cooling tank (4) is provided between the melting mechanism (2) and the pelletizing mechanism (3), characterized in that: The cooling tank (4) is provided with a sponge roller assembly (10), and a stepper motor (16) is provided on one side of the cooling tank (4) to drive the sponge roller assembly (10) to rotate. An adjustment disk (22) that cooperates with the sponge roller assembly (10) is rotatably provided in the cooling tank (4). Two sets of vertical rollers (13) are obliquely symmetrically provided on the top of the adjustment disk (22). A support frame (7) is provided on the side of the cooling tank (4) away from the regulating plate (22). An outer cylinder (14) is installed inside the support frame (7). An inner cylinder (23) is rotatably arranged inside the outer cylinder (14). An array of nozzles (19) is provided on the inner wall of the outer cylinder (14). A through hole (21) is provided through the inner cylinder (23). Impellers (8) are provided at both ends of the inner cylinder (23). A water inlet (5) is provided on one side of the cooling tank (4) at the impeller (8).

2. The pelletizing machine for waste recycling according to claim 1, characterized in that: The inner cylinder (23) has an array of slots (20) at both ends, wherein the slots (20) are located inside the outer cylinder (14), the bottom of the outer cylinder (14) is smooth, and an array of drainage holes are provided at the bottom.

3. The pelletizing machine for waste recycling according to claim 1, characterized in that: The melting mechanism (2) includes a pusher motor (201), a barrel (202), a melting chamber (203) and an extruder (204). The top of the base (1) is provided with a melting chamber (203), wherein the pusher motor (201) and the extruder (204) are provided at one end of the melting chamber (203), and the top of the melting chamber (203) is also provided with a barrel (202).

4. A pelletizing machine for waste recycling according to claim 1, characterized in that: The pelletizing mechanism (3) includes a pelletizer (301), a buffer support (302) and a feed inlet (303). The bottom of the pelletizer (301) is provided with a buffer support (302), and the feed inlet (303) is provided on the side of the pelletizer (301) near the support frame (7).

5. A pelletizing machine for waste recycling according to claim 1, characterized in that: The sponge roller assembly (10) includes two sets of sponge rollers, which are arranged symmetrically on the top and bottom, and the outer surface of the bottom sponge roller is provided with a horizontal surface.

6. A pelletizing machine for waste recycling according to claim 1, characterized in that: A heating component (6) is provided on one side of the cooling tank (4) on the base (1), wherein one end of the heating component (6) is connected to a heat transfer pipe (15), and the other end of the heat transfer pipe (15) is connected to a nozzle (19) inside the outer cylinder (14).

7. A pelletizing machine for waste recycling according to claim 1, characterized in that: One end of the sponge roller assembly (10) passes through the cooling groove (4) and is connected to the transmission mechanism (9). The other end of the transmission mechanism (9) is connected to the spur bevel gear (17), and a side bevel gear (18) meshes with the spur bevel gear (17) on one side. The top of the side bevel gear (18) passes through the cooling groove (4) and is connected to the bottom of the adjusting plate (22).

8. A pelletizing machine for waste recycling according to claim 1, characterized in that: A drain outlet (11) is provided on one side of the cooling tank (4) near the melting mechanism (2), and a pressure roller (12) is provided inside the cooling tank (4).

9. A pelletizing machine for waste recycling according to claim 8, characterized in that: The inlet (5) and outlet (11) are connected to an external cooling circulation system.

10. A pelletizing method for waste recycling, characterized in that: Includes the following steps: Step 1: The recycled waste plastic is sorted to remove impurities such as metal, paper, and cloth. Then it is cut into small pieces by a crusher, washed to remove oil and dust, and moisture is removed to prevent air bubbles from forming during granulation. Step 2: The pre-treated plastic pieces are fed into the screw extruder of the pelletizer by the feeder. The screw rotates at high speed in the barrel, and the plastic is gradually melted and plasticized by friction and external heating to form a uniform plastic melt. The molten plastic melt is filtered through a filter screen to further remove fine impurities, and then extruded through the extrusion head of the die head to form a continuous plastic strip. Step 3: The plastic strip is cooled and shaped in a cooling tank, then fully cooled by the cooperation of an adjusting plate and vertical rollers, and conveyed into an inner cylinder on one side. Through the cooperation of nozzles and through holes, the outer surface is initially dried. The strip is then fed into the pelletizing mechanism at a uniform speed by a traction machine, where it is cut into plastic pellets of uniform length. The pellets are then fully dried at high temperature to remove water molecules from the inside of the pellets. The cut pellets are then screened by a vibrating screen to remove fragments and unqualified pellets. Finally, they are bagged by a packaging machine to become recycled plastic raw materials that can be directly used for production.

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