Plastic extrusion granulator for producing and recycling waste plastics

Abstract

The invention discloses a plastic extrusion pelletizer for producing and recycling waste plastics, relates to the technical field of plastic processing, and aims to solve the problem that when extruded plastic strips are pelletized, blades are usually adopted for cutting, but when the extruded plastic strips are cut, due to the fact that the interiors of the plastic strips are not thoroughly cooled and heat is also generated in the cutting process, the extruded plastic strips are not thoroughly cooled. At present, through mutual cooperation of a scraper and a cutter, when the cutter cuts an extruded plastic material for a long time, the plastic which is not solidified on the surface and is adhered to the surface of the cutter is gradually accumulated on the surface of the cutter, and the plastic is not solidified on the surface of the cutter and is not solidified on the surface of the cutter in the process of rapidly cutting the plastic by the cutter. The cutter has metal elastic deformation, and in the deformation process, hardened plastic attached to the surface of the cutter is removed by the scraper, so that the situation that in the long-time pelletizing process, the pelletizing effect is affected due to adhesion of the surface of the cutter, and the final pelletizing quality does not reach the standard is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of plastic processing, in particular to a plastic extrusion granulator for producing and recycling waste plastics. Background Art

[0002] At present, with the wide and large-scale application of plastics and plastic products, various waste plastics and discarded plastic products are also produced in large quantities. These waste plastics are difficult to degrade in the natural environment and can only be treated by incineration or burial. However, during incineration, many harmful gases such as hydrogen chloride will be produced due to high-temperature combustion, which will cause great harm to the environment. During burial treatment, toxic substances in plastics will seep out, causing secondary pollution and affecting the utilization value of land. Therefore, new processes are needed to obtain the treatment and regeneration of waste plastics. The most common treatment method is to crush the waste plastics and then pass them through a granulator to form plastic particles; Existing granulators usually use blade cutting when granulating extruded plastic strips. However, when cutting the extruded plastic strips, since the inside of the plastic strips is not completely cooled and heat is generated during the cutting process, unsolidified plastic is attached to the blade surface, making granulation difficult and the granulation quality substandard. Summary of the invention

[0003] To achieve the above purpose, the present invention is implemented through the following technical scheme: a plastic extrusion granulator for producing and recycling waste plastics, comprising: A frame, the frame is used to support the structural components, and a connecting fastener is arranged on the top of the frame, the frame includes a base plate and legs, the bottom of the base plate is fixedly connected to the top of the legs; A motor, which is used to provide power for plastic extrusion granulation, and a connecting frame arranged on the surface of the motor; A processing mechanism, which is used for extruding and granulating plastics, and the processing mechanism includes a mixing barrel, the outer surface of which is fixedly connected to a feeding mechanism, the inner wall of which is provided with threads, and the inner wall of which is threadedly connected to a discharging mechanism; The motor is mounted on the top of the frame and is fixedly connected to the top of the frame through a connecting frame on the surface of the motor; the processing mechanism is mounted on the top of the frame, and the frame is fixedly connected to the mixing barrel of the processing mechanism through a connecting fastener; Among them, the discharging mechanism also includes a buffer component and a pelletizing component, the pelletizing component includes a connecting rod, the outer surface of the connecting rod is fixedly connected to a connecting arm, the connecting arm is symmetrically arranged on the outer surface of the connecting rod, the outer surface of the connecting arm is fixedly connected to a cutter, and the outer surface of the connecting arm is fixedly connected to a scraper. Through the cooperation between the scraper and the cutter, when the cutter cuts the extruded plastic material for a long time, the plastic adhering to the surface of the cutter without solidifying on the surface gradually accumulates on the surface of the cutter, causing the cutter to undergo metal elastic deformation during the process of the cutter quickly cutting the plastic. During the deformation process, the scraper removes the hardened plastic adhering to the surface of the cutter to avoid the adhesion of the cutter surface caused by the long-term pelletizing process, which affects the pelletizing effect and causes the quality of the final granulation to be substandard. The end of the scraper close to the cutter fits the outer surface of the cutter.

[0004] Preferably, the inner wall of the mixing barrel is rotatably connected to a rotating shaft, one end of the rotating shaft close to the motor is fixedly connected to the output end of the motor, the outer surface of the mixing barrel is fixedly connected to an electric heating cover, and the outer surface of the rotating shaft is fixedly connected to an auger blade, and the rotation of the auger blade drives the plastic to move forward and mix, so that the hot melting and mixing of the plastic can be carried out simultaneously, thereby improving work efficiency.

[0005] Preferably, the buffer assembly comprises a threaded barrel, the outer surface of the threaded barrel is provided with threads, and the outer surface of the threaded barrel is threadedly connected to the inner wall of the mixing barrel, the inner wall of the threaded barrel is provided with a slide rail, and a sieve plate is slidably connected to the slide rail of the threaded barrel, and the screening effect of the sieve plate blocks the plastic that has not been completely heated in the mixed plastic and still has hard lumps before the pelletizing work is carried out, so that it remains inside the mixing barrel to continue heating and mixing, and prevents the hard lumps from directly entering the holes of the perforated plate under the action of the extrusion force, causing the holes of the perforated plate to be blocked, causing the extrusion process to be obstructed, and the inner wall of the sieve plate is slidably connected to a connecting shaft, and one end of the connecting shaft is close to the rotating shaft The threaded cylinder is fixedly connected to the outer surface of the rotating shaft, and the inner wall of the threaded cylinder is fixedly connected with a hole plate. The surface of the hole plate is provided with holes. The inner wall of the hole plate is rotatably connected to the outer surface of the connecting shaft. An elastic cover is arranged between the hole plate and the sieve plate. Through the elastic deformation of the elastic cover, a certain buffering force is provided when the sieve plate screens the hot-melt plastic passing through. At the same time, the hole plate is slightly blocked, causing extrusion difficulties. During the flow of the hot-melt plastic, the sieve plate presses the elastic cover to deform the elastic cover and cooperate with the sieve plate to slide, thereby reducing the space between the hole plate and the sieve plate, increasing the extrusion force and solving the slight blockage. The end of the elastic cover close to the hole plate is fixedly connected to the outer surface of the hole plate.

[0006] Preferably, the end of the elastic cover close to the sieve plate is fixedly connected to the outer surface of the sieve plate, the end of the perforated plate away from the elastic cover is fitted with the outer surface of the cutter, the outer surface of the threaded barrel is fixedly connected with a connecting block, and the connecting blocks are symmetrically arranged on the outer surface of the threaded barrel, the end of the connecting block away from the threaded barrel is fixedly connected with a heat dissipation cover, and the end of the connecting shaft away from the rotating shaft is fixedly connected to the outer surface of the connecting rod, and the surface of the heat dissipation cover is provided with heat dissipation holes, and the heat of the extruded plastic is diffused into the air through the heat dissipation holes of the heat dissipation cover. At the same time, the heat dissipation cover prevents the plastic attached to the surface of the cutter from splashing under the action of rotational inertia, so as to avoid collection difficulties, and a feeding port is provided at the bottom of the heat dissipation cover, and the outer surface of the heat dissipation cover is fixedly connected with a retaining ring, and the inner wall of the retaining ring is fitted with the outer surface of the connecting rod.

[0007] Preferably, the feeding mechanism includes a lower hopper, the bottom of which is fixedly connected to the outer surface of the mixing barrel, the inner wall of which is fixedly connected with a sieve plate, the surface of which is provided with sieve holes, and the inner wall of which is fixedly connected with a diverter plate, through the cooperation of the diverter plate and the rotary wheel, in the process of the crushed plastic entering the mixing barrel, the falling is blocked by the rotary wheel and the diverter plate, and the falling speed is reduced, so that the crushed plastic falls slowly and evenly into the mixing barrel, avoiding too fast feeding, causing blockage in the mixing barrel, and causing uneven heating, the inner wall of the lower hopper is fixedly connected with a fixing rod, the fixing rod is symmetrically arranged on the inner wall of the lower hopper, and the outer surface of the fixing rod is rotatably connected with a rotary wheel.

[0008] The present invention provides a plastic extrusion granulator for recycling waste plastics. It has the following beneficial effects: 1. The scraper, through the cooperation between the scraper and the cutter, when the cutter cuts the extruded plastic material for a long time, the plastic adhering to the surface of the cutter without solidification gradually accumulates on the surface of the cutter, causing the cutter to undergo metal elastic deformation in the process of rapid cutting of the plastic. During the deformation process, the scraper removes the hardened plastic adhering to the surface of the cutter, thereby avoiding the adhesion of the cutter surface caused by the long-term pelletizing process, which affects the pelletizing effect and causes the final pelletizing quality to be substandard.

[0009] Second, the sieve plate, through the screening effect of the sieve plate, can block the plastic lumps that have not been completely heated in the mixed plastic before the pelletizing work is carried out, so that they can remain in the mixing barrel to continue heating and mixing, and prevent the lumps from directly entering the holes of the perforated plate under the action of the extrusion force, causing the holes of the perforated plate to be blocked, causing the extrusion process to be hindered.

[0010] 3. The elastic cover provides a certain buffering force when the sieve plate screens the hot-melt plastic through its elastic deformation. At the same time, a slight blockage occurs in the hole plate, causing extrusion difficulties. During the flow of the hot-melt plastic, the sieve plate presses the elastic cover to deform the elastic cover and cooperate with the sieve plate to slide, thereby reducing the space between the hole plate and the sieve plate, increasing the extrusion force, and solving the slight blockage.

[0011] Fourth, the heat dissipation cover diffuses the heat of the extruded plastic into the air through the heat dissipation holes of the heat dissipation cover, and at the same time, the heat dissipation cover prevents the plastic attached to the surface of the cutter from splashing under the action of rotation inertia, thereby avoiding collection difficulties.

[0012] 5. The splitter plate, through the cooperation of the splitter plate and the rotor, blocks the falling of the crushed plastic into the mixing barrel by the rotor and the splitter plate, reduces the falling speed, and makes the crushed plastic fall slowly and evenly into the mixing barrel, avoiding excessive feeding, causing blockage in the mixing barrel, and causing uneven heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a front view of the external structure of a plastic extrusion granulator for producing and recycling waste plastics according to the present invention; Figure 2 This is a side view of the structure of a plastic extrusion granulator for producing and recycling waste plastics according to the present invention; Figure 3 It is a schematic diagram of the structure of the processing mechanism of the present invention; Figure 4 It is a structural anatomical diagram of the processing mechanism of the present invention; Figure 5 It is a schematic diagram of the structure of the discharging mechanism of the present invention; Figure 6 This is a structural anatomical diagram of the buffer assembly of the present invention; Figure 7 It is a schematic diagram of the structure of the pelletizing assembly of the present invention; Figure 8 It is a schematic diagram of the structure of the feeding mechanism of the present invention.

[0014] In the figure: 1, frame; 2, processing mechanism; 3, motor; 11, base plate; 12, support leg; 21, mixing barrel; 22, discharging mechanism; 23, feeding mechanism; 24, electric heating cover; 25, rotating shaft; 26, auger blade; 221, buffer assembly; 222, pelletizing assembly; 2211, threaded cylinder; 2212, sieve plate; 2213, elastic cover; 2214, connecting shaft; 2215, perforated plate; 2221, connecting rod; 2222, retaining ring; 2223, cutter; 2224, heat dissipation cover; 2225, connecting block; 2226, scraper; 2227, connecting arm; 231, lower bin; 232, sieve plate; 233, diverter plate; 234, fixing rod; 235, rotating wheel. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0016] The first embodiment, as Figures 1 to 4 and Figure 7 As shown, the present invention provides a technical solution: a plastic extrusion granulator for producing and recycling waste plastics, comprising: A frame 1, which is used to support the structural components, and a connecting fastener arranged on the top of the frame 1, the frame 1 includes a base plate 11 and legs 12, and the bottom of the base plate 11 is fixedly connected to the top of the legs 12; A motor 3, which is used to provide power for plastic extrusion granulation, and a connecting frame arranged on the surface of the motor 3; The processing mechanism 2 is used for extruding and granulating the plastic, and the processing mechanism 2 includes a mixing barrel 21, the outer surface of which is fixedly connected with a feeding mechanism 23, the inner wall of which is provided with threads, and the inner wall of which is threadedly connected with a discharging mechanism 22; The motor 3 is mounted on the top of the frame 1 and is fixedly connected to the top of the frame 1 through a connecting frame on the surface of the motor 3. The processing mechanism 2 is mounted on the top of the frame 1, and the frame 1 is fixedly connected to the mixing barrel 21 of the processing mechanism 2 through a connecting fastener. The discharging mechanism 22 further includes a buffer assembly 221 and a pelletizing assembly 222. The pelletizing assembly 222 includes a connecting rod 2221. The outer surface of the connecting rod 2221 is fixedly connected to a connecting arm 2227. The connecting rod 2221 is connected to the connecting shaft 2214 so that the connecting rod 2221 drives the connecting arm 2227 to rotate. During the rotation of the connecting arm 2227, the connecting arm 2227 drives the cutter 2223. The connecting arm 2227 is symmetrically arranged on the outer surface of the connecting rod 2221. The outer surface of the connecting arm 2227 is fixedly connected to the cutter 2223. The cutter 2223 is tightly connected to the connecting arm 2227. The perforated disk 2215 is attached to pelletize the plastic extruded from the perforated disk 2215. When the cutter 2223 works for a long time, plastic adheres to the surface of the cutter 2223. The outer surface of the connecting arm 2227 is fixedly connected with a scraper 2226. The end of the scraper 2226 close to the cutter 2223 is attached to the outer surface of the cutter 2223. When plastic adheres to the surface of the cutter 2223 and affects pelletizing, the cutter 2223 cannot be attached to the perforated disk 2215, so that the cutter 2223 gradually deforms and warps. When it warps, the cooled attached plastic is cleaned by the scraper 2226 to ensure the pelletizing effect.

[0017] The inner wall of the mixing barrel 21 is rotatably connected with a rotating shaft 25, and one end of the rotating shaft 25 close to the motor 3 is fixedly connected to the output end of the motor 3. The outer surface of the mixing barrel 21 is fixedly connected with an electric heating cover 24, and enters the mixing barrel 21 through the feeding mechanism 23. The rotating shaft 25 is driven to rotate by the motor 3, so that the rotating shaft 25 drives the auger blade 26 to rotate, driving the plastic to move. At the same time, the electric heating cover 24 is energized to operate, so that the electric heating cover 24 heats the plastic inside the mixing barrel 21, so that the waste plastic is hot-melted and becomes a gel. The outer surface of the rotating shaft 25 is fixedly connected with the auger blade 26, which is mixed in the process of the auger blade 26 stirring forward and gradually moves to the discharging mechanism 22, and the mixed and extruded plastic colloid is pelletized by the buffer component 221 and the pelletizing component 222 of the discharging mechanism 22.

[0018] The second embodiment is based on the first embodiment. Figures 5 and 6As shown, the buffer component 221 includes a threaded barrel 2211, the outer surface of the threaded barrel 2211 is provided with threads, and the outer surface of the threaded barrel 2211 is threadedly connected to the inner wall of the mixing barrel 21, the inner wall of the threaded barrel 2211 is provided with a slide rail, and a sieve plate 2212 is slidably connected to the slide rail of the threaded barrel 2211. The plastic to be extruded is screened by the sieve plate 2212 in the buffer component 221, so that the plastic that has not reached the hot melt state continues to stay in the mixing barrel 21 for heating, the inner wall of the sieve plate 2212 is slidably connected to a connecting shaft 2214, and one end of the connecting shaft 2214 close to the rotating shaft 25 is fixedly connected to the outer surface of the rotating shaft 25, and the inner wall of the threaded barrel 2211 A perforated plate 2215 is fixedly connected, and the hot-melt plastic that has reached the state enters the gap between the perforated plate 2215 and the sieve plate 2212, and is squeezed out through the holes on the surface of the perforated plate 2215 under the extrusion force caused by continuous accumulation. The surface of the perforated plate 2215 is provided with holes, and the inner wall of the perforated plate 2215 is rotatably connected to the outer surface of the connecting shaft 2214. At the same time, the pelletizing component 222 is connected to the rotating shaft 25 through the connecting shaft 2214, so that the pelletizing component 222 pelletizes the extruded plastic. An elastic cover 2213 is provided between the perforated plate 2215 and the sieve plate 2212, and the end of the elastic cover 2213 close to the perforated plate 2215 is fixedly connected to the outer surface of the perforated plate 2215.

[0019] The end of the elastic cover 2213 close to the sieve plate 2212 is fixedly connected to the outer surface of the sieve plate 2212, the end of the hole plate 2215 away from the elastic cover 2213 is in contact with the outer surface of the cutter 2223, the outer surface of the threaded cylinder 2211 is fixedly connected with a connecting block 2225, the connecting block 2225 is symmetrically arranged on the outer surface of the threaded cylinder 2211, the end of the connecting block 2225 away from the threaded cylinder 2211 is fixedly connected with a heat dissipation cover 2224, and the end of the connecting shaft 2214 away from the rotating shaft 25 is fixedly connected to the outer surface of the connecting rod 2221. The surface of the heat dissipation cover 2224 is fixedly connected. When the pelletizing component 222 is working, it is connected to the connecting shaft 2214 through the connecting rod 2221, so that the connecting rod 2221 drives the connecting arm 2227 to rotate. The surface of the heat dissipation cover 2224 is provided with heat dissipation holes. During the pelletizing process, the heat emitted by the plastic is discharged through the heat dissipation holes on the surface of the heat dissipation cover 2224, and a discharge port is provided at the bottom of the heat dissipation cover 2224. The outer surface of the heat dissipation cover 2224 is fixedly connected with a retaining ring 2222, and the inner wall of the retaining ring 2222 fits with the outer surface of the connecting rod 2221.

[0020] The third embodiment is based on the first and second embodiments. Figure 8As shown, the feeding mechanism 23 includes a lower bin 231, the bottom of which is fixedly connected to the outer surface of the mixing barrel 21, and a sieve plate 232 is fixedly connected to the inner wall of the lower bin 231, and sieve holes are opened on the surface of the sieve plate 232. The workers pour the crushed waste plastics into the lower bin 231 of the feeding mechanism 23, and screen the crushed waste plastics through the sieve plate 232 fixedly connected in the lower bin 231. The inner wall of the lower bin 231 is fixedly connected to a diverter plate 233, and the inner wall of the lower bin 231 is fixedly connected to a fixed rod 234, which is symmetrically arranged on the inner wall of the lower bin 231, and a rotating wheel 235 is rotatably connected to the outer surface of the fixed rod 234. The screened waste plastics are blocked by the diverter plate 233 and diverted to both sides. At the same time, the plastics falling on the rotating wheel 235 press the rotating wheel 235 to rotate, and gradually fall into the mixing barrel 21 through the rotation of the rotating wheel 235.

[0021] When in use, the motor 3 and the processing mechanism 2 are supported by the frame 1, and the motor 3 drives the rotating shaft 25 of the processing mechanism 2 to rotate, so that the processing mechanism 2 is in operation. Workers add the crushed waste plastics into the device through the feeding mechanism 23 of the processing mechanism 2. After the waste plastics are processed by the processing mechanism 2, they are extruded through the discharging mechanism 22.

[0022] When the broken waste scraps enter the processing mechanism 2 for processing, they enter the mixing barrel 21 through the feeding mechanism 23, and the motor 3 drives the rotating shaft 25 to rotate, so that the rotating shaft 25 drives the auger blade 26 to rotate, driving the plastic to move. At the same time, the electric heating cover 24 is energized to operate, so that the electric heating cover 24 heats the plastic inside the mixing barrel 21, so that the waste plastic is hot-melted and becomes colloid. The waste plastic is mixed in the process of the auger blade 26 stirring forward, and gradually moves to the discharging mechanism 22. The mixed and extruded plastic colloid is pelletized by the buffer component 221 and the pelletizing component 222 of the discharging mechanism 22.

[0023] When the waste plastics enter the processing mechanism 2 through the feeding mechanism 23, the workers pour the crushed waste plastics into the lower bin 231 of the feeding mechanism 23, and screen the crushed waste plastics through the sieve plate 232 fixedly connected in the lower bin 231. The screened waste plastics are blocked by the diverter plate 233 and diverted to both sides. At the same time, the plastics falling on the rotating wheel 235 press the rotating wheel 235 to rotate, and gradually fall into the mixing barrel 21 through the rotation of the rotating wheel 235.

[0024] After the plastics are hot-melted and mixed, they gradually approach the discharging mechanism 22 driven by the auger blade 26, and first pass through the buffer component 221. When passing through the buffer component 221, the plastic to be extruded is screened by the sieve plate 2212 in the buffer component 221, so that the plastic that has not reached the hot-melt state continues to stay in the mixing barrel 21 for heating. The hot-melt plastic that has reached the state enters the gap between the hole plate 2215 and the sieve plate 2212, and is extruded through the holes on the surface of the hole plate 2215 under the extrusion force caused by continuous accumulation. At the same time, the pelletizing component 222 is connected to the rotating shaft 25 through the connecting shaft 2214, so that the pelletizing component 222 pelletizes the extruded plastic.

[0025] When the pelletizing component 222 is working, it is connected to the connecting shaft 2214 through the connecting rod 2221, so that the connecting rod 2221 drives the connecting arm 2227 to rotate. During the rotation of the connecting arm 2227, the cutter 2223 is driven by the connecting arm 2227, so that the cutter 2223 is close to the hole disk 2215, and the plastic extruded from the hole disk 2215 is pelletized. When the cutter 2223 works for a long time, plastic adheres to the surface of the cutter 2223, which affects the pelletizing. The cutter 2223 cannot be close to the hole disk 2215, so that the cutter 2223 gradually deforms and warps. When it warps, the cooled adhered plastic is cleaned by the scraper 2226 to ensure the pelletizing effect. During the pelletizing process, the heat emitted by the plastic is discharged through the heat dissipation holes on the surface of the heat dissipation cover 2224.

[0026] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A plastic extrusion granulator for recycling waste plastics, characterized in that: include: A frame (1), the frame (1) being used to support a structural component, and a connecting fastener arranged on the top of the frame (1), the frame (1) comprising a base plate (11) and supporting legs (12), the bottom of the base plate (11) being fixedly connected to the top of the supporting legs (12); A motor (3), and a connecting frame fixedly mounted on the outer surface of the motor (3); A processing mechanism (2), the processing mechanism (2) is used to extrude and granulate plastic, and the processing mechanism (2) comprises a mixing barrel (21), the outer surface of the mixing barrel (21) is fixedly connected to a feeding mechanism (23), the inner wall of the mixing barrel (21) is provided with threads, and the inner wall of the mixing barrel (21) is threadedly connected to a discharging mechanism (22); The motor (3) is mounted on the top of the frame (1) and is fixedly connected to the top of the frame (1) via a connecting frame on the surface of the motor (3); the processing mechanism (2) is mounted on the top of the frame (1), and the frame (1) is fixedly connected to the mixing barrel (21) of the processing mechanism (2) via a connecting fastener; The discharging mechanism (22) further comprises a buffer assembly (221) and a pelletizing assembly (222); the pelletizing assembly (222) comprises a connecting rod (2221); a connecting arm (2227) is fixedly connected to the outer surface of the connecting rod (2221); the connecting arms (2227) are symmetrically arranged on the outer surface of the connecting rod (2221); a cutter (2223) is fixedly connected to the outer surface of the connecting arm (2227); a scraper (2226) is fixedly connected to the outer surface of the connecting arm (2227); an end of the scraper (2226) close to the cutter (2223) is in contact with the outer surface of the cutter (2223).

2. A plastic extrusion granulator for recycling waste plastics according to claim 1, characterized in that: The inner wall of the mixing barrel (21) is rotatably connected to a rotating shaft (25), one end of the rotating shaft (25) close to the motor (3) is fixedly connected to the output end of the motor (3), the outer surface of the mixing barrel (21) is fixedly connected to an electric heating cover (24), and the outer surface of the rotating shaft (25) is fixedly connected to an auger blade (26).

3. A plastic extrusion granulator for recycling waste plastics according to claim 1, characterized in that: The buffer assembly (221) comprises a threaded barrel (2211), the outer surface of the threaded barrel (2211) being provided with threads, and the outer surface of the threaded barrel (2211) being threadedly connected to the inner wall of the mixing barrel (21), the inner wall of the threaded barrel (2211) being provided with a slide rail, a sieve plate (2212) being slidably connected to the slide rail of the threaded barrel (2211), and a connecting shaft (2214) being slidably connected to the inner wall of the sieve plate (2212).

4. A plastic extrusion granulator for recycling waste plastics according to claim 3, characterized in that: One end of the connecting shaft (2214) close to the rotating shaft (25) is fixedly connected to the outer surface of the rotating shaft (25); the inner wall of the threaded cylinder (2211) is fixedly connected to a perforated disk (2215); a hole is provided on the surface of the perforated disk (2215); and the inner wall of the perforated disk (2215) is rotatably connected to the outer surface of the connecting shaft (2214).

5. A plastic extrusion granulator for recycling waste plastics according to claim 4, characterized in that: An elastic cover (2213) is provided between the orifice plate (2215) and the sieve plate (2212), and one end of the elastic cover (2213) close to the orifice plate (2215) is fixedly connected to the outer surface of the orifice plate (2215).

6. A plastic extrusion granulator for recycling waste plastics according to claim 5, characterized in that: One end of the elastic cover (2213) close to the sieve plate (2212) is fixedly connected to the outer surface of the sieve plate (2212), one end of the perforated plate (2215) away from the elastic cover (2213) is in contact with the outer surface of the cutter (2223), and the outer surface of the threaded cylinder (2211) is fixedly connected to a connecting block (2225).

7. A plastic extrusion granulator for recycling waste plastics according to claim 6, characterized in that: The connecting blocks (2225) are symmetrically arranged on the outer surface of the threaded barrel (2211); one end of the connecting block (2225) away from the threaded barrel (2211) is fixedly connected to a heat dissipation cover (2224); and one end of the connecting shaft (2214) away from the rotating shaft (25) is fixedly connected to the outer surface of the connecting rod (2221).

8. A plastic extrusion granulator for recycling waste plastics according to claim 7, characterized in that: The surface of the heat dissipation cover (2224) is provided with heat dissipation holes, and the bottom of the heat dissipation cover (2224) is provided with a feed opening. The outer surface of the heat dissipation cover (2224) is fixedly connected with a retaining ring (2222), and the inner wall of the retaining ring (2222) is in contact with the outer surface of the connecting rod (2221).

9. The plastic extrusion granulator for recycling waste plastics according to claim 1, characterized in that: The feeding mechanism (23) comprises a lower material bin (231), the bottom of which is fixedly connected to the outer surface of the mixing barrel (21), and the inner wall of which is fixedly connected to a sieve plate (232), wherein sieve holes are provided on the surface of the sieve plate (232).

10. A plastic extrusion granulator for recycling waste plastics according to claim 9, characterized in that: A diverter plate (233) is fixedly connected to the inner wall of the lower material bin (231), a fixing rod (234) is fixedly connected to the inner wall of the lower material bin (231), the fixing rod (234) is symmetrically arranged on the inner wall of the lower material bin (231), and a rotating wheel (235) is rotatably connected to the outer surface of the fixing rod (234).

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