Granulator for plastic recycling and use method thereof

Abstract

The invention provides a granulator for plastic recycling and a use method of the granulator, and relates to the technical field of plastic recycling equipment. The control and support system comprises a control box and a support frame, the control box is provided with a PLC (Programmable Logic Controller), and a control panel and an AI control module which are in circuit connection with the PLC, and the support frame is arranged on the rear side of the control box; and the extrusion part is installed at the top of the supporting frame and comprises a heating extrusion box and a two-stage screw, and the control end of a heating pipe in the heating extrusion box is electrically connected with the PLC. By arranging the two-stage screw and electromagnetic induction heating, plastics are further plasticized, and meanwhile, the PLC system monitors and adjusts process parameters in real time, so that intelligent control and automatic production are realized, plastic melt can be uniformly plasticized, the energy consumption of equipment is reduced, the plasticizing efficiency is improved, and the defect that an existing plastic granulator is relatively low in plasticizing efficiency is overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic recycling equipment, and particularly to a granulator for plastic recycling and its usage method. Background Art

[0002] Plastic recycling is an important way to achieve the "dual carbon" goal. Its core lies in converting waste plastics into high-value recycled granules through a granulator. Traditional granulators have significant technical bottlenecks in the field of plastic recycling: For example, there is a contradiction between plasticizing efficiency and energy consumption: The single-screw structure relies on mechanical friction to generate heat, and the plasticizing efficiency for high-density waste plastics is relatively low, and the energy consumption per unit product is high. Another example is that after plastic extrusion and molding, it is necessary to manually bypass the end of the plastic strip around the cooling water tank and send it to the cutting machine port. During this period, the length of the plastic strip is likely to be inconsistent, resulting in uneven ends when sent to the cutting machine, making it difficult to achieve automatic leveling through the traction device. As a result, the granules are sent in a curved and straight manner, and the size of the cut granules is inconsistent. Moreover, during water bath cooling, a relatively long length of the water tank is required to achieve the cooling effect, resulting in a large floor area of the granulator.

[0003] Therefore, it is of great practical significance to develop a plastic granulator that can improve plasticizing efficiency, can clamp the end of the plastic strip to achieve smooth feeding into the cutting machine, can shorten the length of the water bath cooling tank, and has a convenient extrusion die replacement. Summary of the Invention

[0004] Embodiments of the present disclosure relate to a granulator for plastic recycling and its usage method to overcome the defects of relatively low plasticizing efficiency, uneven feeding of the plastic strip end into the cutting machine, and relatively long water bath cooling length of existing plastic granulators.

[0005] In the first aspect of the present disclosure, a granulator for plastic recycling and its usage method are provided, specifically including: a control and support system, an extrusion component, a cooling tank, a clamping auxiliary component, and a cutting machine; the control and support system includes a control box and a support frame. A PLC controller, an operation panel circuit-connected thereto, and an AI control module are installed on the control box, and the support frame is installed at the rear side of the control box; the extrusion component is installed on the top of the support frame. The extrusion component includes a heating extrusion box and a double-stage screw. The control end of the heating tube inside the heating extrusion box is electrically connected to the PLC controller. The double-stage screw is installed in the center of the heating tube inside the heating extrusion box, and a clamping auxiliary component is inserted at the end of the heating extrusion box. A second connecting plate is installed at the end of the double-stage screw and inside the heating extrusion box; an extrusion die is clamped inside the second connecting plate; a cooling inner component is installed inside the cooling tank; the cooling inner component includes an upper frame and a lower frame. The upper frame is inserted above the lower frame, and the plastic strip extruded from the heating extrusion box bypasses the fixed shafts inside the upper frame and the lower frame; the controller of the cutting machine is installed inside the control box, and a traction port is provided on the right end face of the cutting machine. The traction port is higher than the top surface height of the cooling tank.

[0006] In at least some embodiments, the right section of the double-stage screw is a primary crushing screw, which is relatively thick and is used for crushing and preliminary plasticization of the material. The left section of the double-stage screw is a secondary fine plasticizing screw. The thread ridges on the outer wall of the screw are smaller than those of the primary crushing screw, and the pitch of the secondary fine plasticizing screw is smaller than that of the primary crushing screw. Further plasticization is achieved through electromagnetic induction heating. At the same time, the PLC system monitors and adjusts the process parameters in real time, thereby realizing intelligent control and automated production. It can also evenly plasticize the plastic melt. A heating and plasticizing tube is arranged outside the double-stage screw. The end of the heating and plasticizing tube is fixedly connected to a first connecting plate. The left end face of the first connecting plate is fixedly connected to an extrusion die connecting piece through a bolt assembly. The end of the extrusion die connecting piece is threadedly connected to the second connecting plate.

[0007] In at least some embodiments, the height of the upper frame and the lower frame is lower than that of the cooling tank. The front and rear ends on the right side of the outside of the upper frame are fixedly welded with clamping rods. The front and rear ends on the right side of the outside of the lower frame are fixedly welded with a first connecting rod. The first connecting rod is clamped on the arc-shaped supporting plate at the top end of the lifting rod. The bottom surface of the upper frame is fixedly connected with an insertion plate. The insertion plate is inserted into the rectangular groove on the top surface of the lower frame. Arc-shaped protruding plates and arc-shaped grooves are alternately arranged at the bottom of the upper frame. Arc-shaped protruding plates and arc-shaped grooves are alternately arranged at the top of the lower frame. And the arc-shaped protruding plate of the upper frame is mutually clamped with the arc-shaped groove of the lower frame. A guiding roller is rotationally clamped on the arc-shaped protruding plate through a shaft.

[0008] In at least some embodiments, a feeding port is provided at the top right side of the heating extrusion box. The feeding port is installed directly below the discharge port of the extruder. A temperature controller is installed on the top of the heating extrusion box and on the left side of the feeding port.

[0009] In at least some embodiments, the clamping auxiliary member includes a grip rod and a clamping plate. There are two grip rods. At the opposite ends of the two grip rods, there are fixed baffles. At the facing ends of the grip rods, there are fixed third connecting plates. On the opposite faces of the two third connecting plates, there are vertically arranged T-shaped sliding rails. Through holes are formed inside the third connecting plates. A second connecting rod is fixedly connected between the two third connecting plates. A shifting plate is sleeved on the grip rod. An arc-shaped grip is arranged at the top of the shifting plate. Both ends of the clamping plate are clamped on the T-shaped sliding rails. A clamping plate is installed on the outside of the clamping plate. An elastic cord is fixedly connected inside the clamping plate. The elastic cord passes through the third connecting plate and is fixedly connected to the shifting plate.

[0010] In at least some embodiments, a protruding rectangular frame is provided on the outer edge of the right end face of the extrusion die. The rectangular frame is clamped inside the extrusion die connecting member, and the right end face of the extrusion die is flush with the right end face of the extrusion die connecting member.

[0011] In at least some embodiments, a traction port is provided on the right end face of the cutting machine. Two sets of traction rollers are installed inside the traction port. The upper and lower two traction rollers are in a group, and a plastic strip is conveyed between each group of traction rollers. An outlet for pellets made of a telescopic pipe is installed on the left end face of the cutting machine.

[0012] In at least some embodiments, lifting rods are respectively installed on the front and rear sides at the right end of the cooling tank. An arc-shaped support plate is fixedly connected to the top of the lifting rod. A clamping plate is provided on the top surface on the right side of the cooling tank. Two grooves are formed on the left side of the clamping plate. The upper groove is horizontal, and the lower groove is right-angled.

[0013] In at least some embodiments, a support plate is fixedly connected to the top surface at the right end of the support frame. A driving motor is installed on the top of the support plate. The driving shaft of the driving motor is coaxially connected to a gearbox. The output shaft of the gearbox is coaxially connected to a double-stage screw rod. The driving motor is used to rotate and drive the double-stage screw rod, and no housing is provided outside to ensure the heat dissipation of the driving motor after long-term use.

[0014] The present invention discloses an interactive control method for a building construction distance and azimuth measuring device, including the following steps:

[0015] 1). Preliminary plasticization: The plastic viscous fluid of the extruder is put into the feeding port, and the material is crushed and preliminarily plasticized by the primary crushing screw rod on the right section of the double-stage screw rod;

[0016] 2). Plasticization stage: The plastic part is plasticized through the cooperation of the secondary fine plasticization screw rod on the left section of the double-stage screw rod and electromagnetic induction heating. At the same time, real-time monitoring is carried out by using the PLC control system and the temperature controller, and the process parameters are adjusted through the AI control module;

[0017] 3). Extrusion molding: The plasticized plastic is extruded and formed in the form of a strip through the extrusion die;

[0018] 4), Water bath cooling: Clamp the end of the extruded plastic strip through the clamping auxiliary part, bypass the guide rollers on the upper rack and the lower rack, and perform water bath cooling in the cooling tank;

[0019] 5), Cutting into pellets: Use the clamping auxiliary part to place the plastic strip between the traction rollers in the traction port, and complete the cutting into pellets through the cutting machine.

[0020] The present invention provides a method for using a granulator for plastic recycling, which has the following beneficial effects:

[0021] When the present invention is in use, through the setting of the double-stage screw and electromagnetic induction heating, the plastic is further plasticized. At the same time, the PLC system monitors and adjusts the process parameters in real time, so as to realize intelligent control and automatic production. It can also uniformly plasticize the plastic melt, reduce the energy consumption of the equipment, and improve the plasticization efficiency.

[0022] In addition, by setting the clamping auxiliary part, the arc-shaped handle can be held to pull the dial plate outwards, and then the clamping plate is pressed to move towards the middle by the clamping plate to clamp the plastic strip. All the extruded and formed plastic strips are pulled and transferred, passed through the cooling inner component in the cooling tank, and then sent to the cutting machine for cutting into pellets.

[0023] In addition, the guide roller can be used to guide the cooling direction of the plastic strip. After the plastic strip bypasses the guide roller in the up and down directions, the contact area of the plastic strip in the cooling inner component can be increased, the cooling efficiency can be improved, and the length of the cooling tank can be shortened. Brief Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below.

[0025] The drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0026] In the drawings:

[0027] Figure 1 Shows the structural schematic diagram of the overall structural components of the present invention;

[0028] Figure 2 Shows the structural schematic diagram of the cutting machine of the present invention;

[0029] Figure 3 Shows the structural schematic diagram of the extrusion component of the present invention;

[0030] Figure 4 Shows the structural schematic diagram of the basic mold connecting piece of the present invention;

[0031] Figure 5Shows the unfolded structural schematic diagram between the second connecting plate of the present invention and the extrusion die;

[0032] Figure 6 Shows the structural schematic diagram of the clamping auxiliary part of the present invention;

[0033] Figure 7 Shows the structural schematic diagram of the clamping auxiliary part of the present invention;

[0034] Figure 8 Shows the structural schematic diagram of the cooling tank of the present invention;

[0035] Figure 9 Shows the present invention Figure 8 The enlarged structural schematic diagram at position A;

[0036] Figure 10 Shows the unfolded structural schematic diagram of the cooling inner component of the present invention.

[0037] List of reference numerals

[0038] 1. Control and support system; 11. Control box; 12. Support frame; 1201. Support plate;

[0039] 2. Extrusion component; 21. Heating extrusion box; 2101. Feed inlet; 2102. Temperature controller; 22. Twin-screw; 2201. First connecting plate; 2202. Extrusion die connecting piece; 2203. Second connecting plate;

[0040] 3. Extrusion die;

[0041] 4. Cooling tank; 401. Lifting rod; 402. Clamping plate;

[0042] 5. Cooling inner component; 51. Upper frame; 5101. Clamping rod; 52. Lower frame; 5201. Connecting rod one;

[0043] 6. Clamping auxiliary part; 61. Holding rod; 6101. Third connecting plate; 6102. Pushing plate; 6103. Connecting rod two; 62. Clamping plate; 6201. Elastic cord; 6202. Clamping block;

[0044] 7. Cutting machine; 701. Traction port; 7011. Traction roller; 702. Granule outlet. Detailed implementation manners

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present invention in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0046] Embodiment: Please refer to the attached Figure 1 to the attached Figure 10 :

[0047] The present invention provides a pelletizer for plastic recycling and its usage method, including: a control and support system 1, an extrusion component 2, a cooling tank 4, a clamping auxiliary 6, and a cutting machine 7; the control and support system 1 includes a control box 11 and a support frame 12. A PLC controller, its electrically connected control panel, and an AI control module are installed on the control box 11. The support frame 12 is installed at the rear side of the control box 11; the extrusion component 2 is installed on the top of the support frame 12. The extrusion component 2 includes a heating and extrusion box 21 and a double-stage screw 22. The control end of the heating tube inside the heating and extrusion box 21 is electrically connected to the PLC controller. The double-stage screw 22 is installed in the center of the heating tube inside the heating and extrusion box 21. And a clamping auxiliary 6 is inserted at the end of the heating and extrusion box 21. A second connecting plate 2203 is installed inside the double-stage screw 22 and inside the heating and extrusion box 21; an extrusion die 3 is clamped inside the second connecting plate 2203; a cooling inner component 5 is installed inside the cooling tank 4; the cooling inner component 5 includes an upper frame 51 and a lower frame 52. The upper frame 51 is inserted above the lower frame 52, and the plastic strip extruded from the heating and extrusion box 21 bypasses the fixed shafts inside the upper frame 51 and the lower frame 52; the controller of the cutting machine 7 is installed inside the control box 11. A traction port 701 is provided on the right end face of the cutting machine 7. The height of the traction port 701 is higher than the top surface of the cooling tank 4.

[0048] In the embodiments of the present disclosure, please refer to the attached Figure 1 and the attached Figure 2 As shown, a traction port 701 is provided on the right end face of the cutting machine 7. Two groups of traction rollers 7011 are installed inside the traction port 701. The upper and lower two of the traction rollers 7011 are a group, and the plastic draw bar is conveyed between each group of traction rollers 7011. An outlet port 702 made of a telescopic tube is installed on the left end face of the cutting machine 7. By means of installation, the outlet port 702 made of a telescopic tube can freely adjust the height and orientation of the outlet port 702, which can facilitate the reception of plastic pellets by containers of different specifications. And through the design of adding the traction rollers 7011 to the traction port 701, compared with traditional pelletizers, the design of a traction device can be reduced, and the production cost can be lowered.

[0049] In the embodiments of the present disclosure, please refer to the attachedFigure 8 and the attached Figure 9 As shown in the figure, lifting rods 401 are respectively installed on the front and rear sides at the right end of the cooling tank 4. The top ends of the lifting rods 401 are fixedly connected with arc-shaped supporting plates, and a clamping plate 402 is arranged on the right top surface of the cooling tank 4. Two grooves are opened on the left side of the clamping plate 402. The upper groove is horizontal and the lower groove is right-angled. After starting the controller of the lifting rod 401 by using the control box 11, the lifting rod 401 is lifted. The lower rack 52 can be lifted by using the arc-shaped supporting plate, so as to facilitate the placement of the end of the plastic strip.

[0050] In the embodiment of the present disclosure, please refer to the attached Figure 1 and the attached Figure 3 As shown in the figure, the right section of the twin-screw 22 is a primary crushing screw, and the screw is relatively thick, which is used for crushing and preliminary plasticization of the material. The left section of the twin-screw 22 is a secondary fine plasticizing screw. The thread ridges on the outer wall of the screw are smaller than those of the primary crushing screw, and the pitch of the secondary fine plasticizing screw is smaller than that of the primary crushing screw. Further plasticization is carried out by electromagnetic induction heating. At the same time, the PLC system monitors and adjusts the process parameters in real time, so as to realize intelligent control and automated production. It can also make the plastic melt plasticize evenly, and the energy consumption is reduced by more than 30% compared with the traditional equipment, and the plasticization efficiency is increased by 25% (the data is from the comparison of the processing efficiency after the equipment improvement). A heating and plasticizing pipe is arranged outside the twin-screw 22. The end of the heating and plasticizing pipe is fixedly connected with a first connecting plate 2201. The left end face of the first connecting plate 2201 is fixedly connected with an extrusion die connecting piece 2202 through a bolt assembly. The end of the extrusion die connecting piece 2202 is threadedly connected with a second connecting plate 2203. The inner cavity of the extrusion die connecting piece 2202 has a structure with a circular cross-section on the right side and a rectangular cross-section on the left side, so that the plasticized plastic can be extruded in a rectangular cross-section, which better cooperates with the extrusion die 3 for strip extrusion molding.

[0051] In the embodiment of the present disclosure, please refer to the attached Figure 5 As shown in the figure, a protruding rectangular frame is arranged on the outer edge of the right end face of the extrusion die 3. The rectangular frame is clamped inside the extrusion die connecting piece 2202, and the right end face of the extrusion die 3 is flush with the right end face of the extrusion die connecting piece 2202. Through the customized design of the extrusion die connecting piece 2202, the port of the extrusion die 3 can be aligned during extrusion for plastic strip extrusion molding, so as to reduce the pressure load of the extrusion die 3. Moreover, the detachable design of the extrusion die 3 is convenient for replacing it with different-caliber plastic strip extrusion molding, improving the applicability of the granulator.

[0052] In the embodiment of the present disclosure, please refer to the attached Figure 2 , the attached Figure 8 and the attached Figure 10As shown in the figure, the heights of the upper rack 51 and the lower rack 52 are lower than that of the cooling tank 4. At the front and rear ends on the right side of the outside of the upper rack 51, clamping rods 5101 are fixedly welded. At the front and rear ends on the right side of the outside of the lower rack 52, a first connecting rod 5201 is fixedly welded. The first connecting rod 5201 is clamped on the arc-shaped supporting plate at the top end of the lifting rod 401. The bottom surface of the upper rack 51 is fixedly connected with an insertion plate, and the insertion plate is inserted into the rectangular groove on the top surface of the lower rack 52. Arc-shaped protruding plates and arc-shaped grooves are alternately arranged at the bottom of the upper rack 51, and arc-shaped protruding plates and arc-shaped grooves are alternately arranged at the top of the lower rack 52. Moreover, the arc-shaped protruding plate of the upper rack 51 is clamped with the arc-shaped groove of the lower rack 52. A guiding roller is rotatably clamped on the arc-shaped protruding plate through a shaft. The guiding roller can be used to guide the cooling direction of the plastic strip. After the plastic strip bypasses the guiding roller in the up and down directions, the contact area of the plastic strip in the cooling inner component 5 is increased, and the cooling efficiency is improved.

[0053] In the embodiment of the present disclosure, please refer to the attached Figure 1 and the attached Figure 2 As shown in the figure, a feed inlet 2101 is arranged at the top right side of the heating and extrusion box 21. The feed inlet 2101 is installed directly below the discharge port of the extruder. A temperature controller 2102 is installed at the top of the heating and extrusion box 21 and on the left side of the feed inlet 2101. The temperature controller 2102 can be used to finely control the temperature inside the heating and extrusion box 21 to ensure the degree of plasticization. The plastic viscous fluid extruded by the extruder can directly fall into the heating and extrusion box 21 through the feed inlet 2101 for plasticization and then extrusion molding.

[0054] In the embodiment of the present disclosure, please refer to the attached Figure 6 and the attached Figure 7As shown in the figure, the clamping auxiliary 6 includes a grip rod 61 and a clamping plate 62. There are two grip rods 61. At the opposite ends of the two grip rods 61, there are fixed baffles. At the opposite ends of the grip rods 61, there are fixed third connecting plates 6101. On the opposite surfaces of the two third connecting plates 6101, there are vertically arranged T-shaped slide rails. Through holes are provided inside the third connecting plates 6101. Between the two third connecting plates 6101, there is a fixed connecting rod two 6103. A shifting plate 6102 is sleeved on the grip rod 61. At the top of the shifting plate 6102, there is an arc-shaped grip. The two ends of the clamping plate 62 are clamped on the T-shaped slide rails. On the outside of the clamping plate 62, there is a clamping plate 6202. Inside the clamping plate 6202, there is a fixed elastic cord 6201. The elastic cord 6201 passes through the third connecting plate 6101 and is fixedly connected to the shifting plate 6102. After holding the arc-shaped grip and pulling the shifting plate 6102 to move outward, the elastic cord 6201 is pulled to move outward and the included angle between the upper and lower elastic cords 6201 becomes smaller. At the same time, the clamping plate 62 is pulled to move outward. While the included angle between the upper and lower sides of the elastic cord 6201 becomes smaller, the clamping plate 62 presses the clamping plate 6202 to move towards the middle, so as to clamp the plastic strip, facilitating the pulling and transferring of all extruded plastic strips. After passing through the cooling inner component 5 in the cooling tank 4, it is sent to the cutting machine 7 for cutting into pellets.

[0055] In the embodiment of the present disclosure, please refer to the attached Figure 1 As shown in the figure, on the top surface of the right end of the support frame 12, there is a fixed support plate 1201. At the top of the support plate 1201, there is a driving motor. The driving shaft of the driving motor is coaxially connected to a gearbox. The output shaft of the gearbox is coaxially connected to the double-stage screw 22. The driving motor is used to rotate and drive the double-stage screw 22. By using the PLC controller and the AI control module of the control box 11, intelligent control and automated production of the production line can be realized, reducing labor costs.

[0056] The present invention discloses a method for using a granulator for plastic recycling, including the following steps:

[0057] 1). Preliminary plasticization: The plastic viscous fluid of the extruder is put into the feeding port 2101, and the material is crushed and preliminarily plasticized by the primary crushing screw on the right section of the double-stage screw 22;

[0058] 2). Plasticization stage: The plastic parts are plasticized by the cooperation of the secondary fine plasticizing screw on the left section of the double-stage screw 22 and electromagnetic induction heating. At the same time, real-time monitoring is carried out by using the PLC control system and the temperature controller 2102, and the process parameters are adjusted through the AI control module;

[0059] 3). Extrusion molding: The plasticized plastic is extruded and molded in the form of strips through the extrusion die 3;

[0060] 4), Water bath cooling: Clamp the end of the extruded plastic strip through the clamping auxiliary part 6, bypass the guide rollers on the upper rack 51 and the lower rack 52, and perform water bath cooling in the cooling tank 4;

[0061] 5), Cutting into pellets: Place the plastic strip between the traction rollers 7011 in the traction port 701 by using the clamping auxiliary part 6, and complete the cutting into pellets through the cutting machine 7.

[0062] The working principle of this embodiment: First, according to the position of the discharge port of the extruder, install the control box 11 and the support frame 12 at appropriate positions, install the extrusion die 3 into the extrusion die connecting part 2202, connect the extrusion die connecting part 2202 to the first connecting plate 2201 through threaded connection, and perform parameter regulation through the PLC controller and the AI control module in the control box 11. Then, start the lifting rod 401 to lift the lower rack 52 upward, so that the first connecting rod 5201 is clamped into the right-angled lower channel on the left side of the clamping plate 402. At the same time, the upper rack 51 can be lifted and clamped into the horizontal upper channel on the left side of the clamping plate 402. Push the lower rack 52 to make the first connecting rod 5201 clamped into the lowest position of the right-angled lower channel. At this time, the upper rack 51 and the lower rack 52 are unfolded. After the plastic is formed and extruded, use the clamping auxiliary part 6 to clamp and move the end of the plastic strip, send it into the cooling tank 4, bypass the guide rollers on the upper rack 51 and the lower rack 52, and finally send it between the traction rollers 7011. Complete the cutting into pellets through the cutting machine 7, and complete the pellet discharging through the pellet discharging port 702.

Claims

1. A granulator for plastic recycling and its usage method, characterized in that, A granulator for plastic recycling includes: a control and support system (1), an extrusion component (2), a cooling tank (4), a clamping auxiliary (6), and a cutting machine (7); the control and support system (1) includes a control box (11) and a support frame (12). A PLC controller, an operation panel electrically connected thereto, and an AI control module are installed on the control box (11), and the support frame (12) is installed at the rear side of the control box (11); the extrusion component (2) is installed on the top of the support frame (12), and the extrusion component (2) includes a heating and extrusion box (21) and a double-stage screw (22). The control end of the heating tube inside the heating and extrusion box (21) is electrically connected to the PLC controller. The double-stage screw (22) is installed in the center of the heating tube inside the heating and extrusion box (21), and a clamping auxiliary (6) is inserted at the end of the heating and extrusion box (21). A second connecting plate (2203) is installed at the end of the double-stage screw (22) and inside the heating and extrusion box (21); the extrusion die (3) is clamped inside the second connecting plate (2203); a cooling inner component (5) is installed inside the cooling tank (4); the cooling inner component (5) includes an upper frame (51) and a lower frame (52). The upper frame (51) is inserted above the lower frame (52), and the plastic strip extruded from the heating and extrusion box (21) bypasses the fixed shafts inside the upper frame (51) and the lower frame (52); the controller of the cutting machine (7) is installed inside the control box (11), and a traction port (701) is provided on the right end face of the cutting machine (7), and the height of the traction port (701) is higher than the top surface height of the cooling tank (4).

2. The granulator for plastic reuse according to claim 1, characterized in that, A support plate (1201) is fixedly connected to the top surface of the right end of the support frame (12). A driving motor is installed on the top of the support plate (1201), and the driving shaft of the driving motor is coaxially connected to a gearbox, and the output shaft of the gearbox is coaxially connected to the double-stage screw (22).

3. A granulator for plastic recycling according to claim 1, characterized in that, A feed inlet (2101) is provided at the top right side of the heating and extrusion box (21), and the feed inlet (2101) is installed directly below the discharge port of the extruder. A temperature controller (2102) is installed on the top of the heating and extrusion box (21) and on the left side of the feed inlet (2101).

4. A granulator for plastic reuse according to claim 3, characterized in that, The right section of the double-stage screw (22) is a primary crushing screw, and the left section of the double-stage screw (22) is a secondary fine plasticizing screw. The thread ridges on the outer wall of the screw are smaller than those of the primary crushing screw, and the pitch of the secondary fine plasticizing screw is smaller than that of the primary crushing screw. A heating and plasticizing tube is provided outside the double-stage screw (22), and the end of the heating and plasticizing tube is fixedly connected to a first connecting plate (2201). The left end face of the first connecting plate (2201) is fixedly connected to an extrusion die connecting member (2202) through a bolt assembly, and the end of the extrusion die connecting member (2202) is threadedly connected to the second connecting plate (2203).

5. A granulator for plastic recycling according to claim 4, characterized in that, A protruding rectangular frame is provided on the outer edge of the right end face of the extrusion die (3), and the rectangular frame is clamped inside the extrusion die connecting member (2202), and the right end face of the extrusion die (3) is flush with the right end face of the extrusion die connecting member (2202).

6. A granulator for plastic recycling according to claim 1, characterized in that, On the front and back sides of the right end of the cooling tank (4), lifting rods (401) are respectively installed. The top ends of the lifting rods (401) are fixedly connected with arc-shaped supporting plates. And on the right top surface of the cooling tank (4), a clamping plate (402) is arranged. Two grooves are formed on the left side of the clamping plate (402). The upper groove is horizontal, and the lower groove is right-angled.

7. A granulator for plastic reuse according to claim 6, characterized in that, The height sum of the upper frame (51) and the lower frame (52) is lower than that of the cooling tank (4). At the front and back ends on the right side of the outside of the upper frame (51), clamping rods (5101) are fixedly welded. At the front and back ends on the right side of the outside of the lower frame (52), connecting rods one (5201) are fixedly welded. The connecting rods one (5201) are clamped on the arc-shaped supporting plates at the top ends of the lifting rods (401). The bottom surface of the upper frame (51) is fixedly connected with an inserting plate, and the inserting plate is inserted into a rectangular groove on the top surface of the lower frame (52). Arc-shaped protruding plates and arc-shaped grooves are alternately arranged at the bottom of the upper frame (51), and arc-shaped protruding plates and arc-shaped grooves are alternately arranged at the top of the lower frame (52). And the arc-shaped protruding plates of the upper frame (51) are mutually clamped with the arc-shaped grooves of the lower frame (52). Guide rollers are rotationally clamped on the arc-shaped protruding plates through shafts.

8. A granulator for plastic reuse according to claim 1, characterized in that, The clamping auxiliary part (6) includes a holding rod (61) and a clamping plate (62). There are two holding rods (61). At the opposite ends of the two holding rods (61), baffles are fixedly connected. At the facing ends of the holding rods (61), third connecting plates (6101) are fixedly connected. Vertical T-shaped sliding rails are arranged on the opposite surfaces of the two third connecting plates (6101). Through holes are formed inside the third connecting plates (6101). A connecting rod two (6103) is fixedly connected between the two third connecting plates (6101). A shifting plate (6102) is sleeved on the holding rod (61). An arc-shaped grip is arranged at the top end of the shifting plate (6102). The two ends of the clamping plate (62) are clamped on the T-shaped sliding rails. A clamping plate (6202) is installed on the outer side of the clamping plate (62). An elastic rope (6201) is fixedly connected inside the clamping plate (6202). The elastic rope (6201) passes through the third connecting plate (6101) and is fixedly connected to the shifting plate (6102).

9. A granulator for plastic recycling according to claim 1, wherein, On the right end face of the cutting machine (7), a traction port (701) is arranged. Two groups of traction rollers (7011) are installed inside the traction port (701). The upper and lower two traction rollers (7011) are in a group, and plastic strips are conveyed between each group of traction rollers (7011). An outlet port (702) made of a telescopic pipe is installed on the left end face of the cutting machine (7).

10. The usage method of a granulator for plastic recycling according to any one of claims 1-9, characterized in that, Including the following steps: 1). Preliminary plasticization: The plastic viscous fluid of the extruder is put into the feed port (2101), and the material is crushed and preliminarily plasticized by the primary crushing screw on the right section of the double-stage screw (22); 2). Plasticization stage: The plastic parts are plasticized by the cooperation of the secondary fine plasticization screw on the left section of the double-stage screw (22) and electromagnetic induction heating. At the same time, real-time monitoring is carried out by using the PLC control system and the temperature controller (2102), and the process parameters are adjusted through the AI control module; 3). Extrusion molding: The plasticized plastic is extruded and formed in the form of strips through the extrusion die (3); 4), water bath cooling: Clamp the end of the extruded plastic strip by the clamping auxiliary part (6), bypass the guide rollers on the upper rack (51) and the lower rack (52), and perform water bath cooling in the cooling tank (4); 5), cutting into pellets: Place the plastic strip between the traction rollers (7011) in the traction port (701) by using the clamping auxiliary part (6), and complete the cutting into pellets through the cutting machine (7).

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