Waste plastic recycling injection molding machine based on sorting and feeding structure

Abstract

The invention relates to the field of injection molding, and discloses a waste plastic recovery injection molding machine based on a sorting and feeding structure, the waste plastic recovery injection molding machine comprises a sorting part, the sorting part comprises a mounting shell, the upper end of the mounting shell is fixedly communicated with a hopper, the upper end of the mounting shell is through and rotatably connected with a central pipe, and the central pipe is fixedly sleeved with a conical filter screen; the dredging part comprises a driving assembly, the driving assembly is arranged in the mounting shell, the lower end of the mounting shell is fixedly connected with a supporting plate, the lower end of the central pipe fixedly communicates with a ventilation seat, the ventilation seat is rotationally connected with the supporting plate, the ventilation seat is connected with a dredging assembly, and the dredging assembly is connected with a reducing assembly; the waste plastic recycling injection molding machine based on the sorting and feeding structure can effectively solve the problems that in the prior art, when plastic particles are statically stacked in a hopper, the phenomena of wall hanging and bridging are prone to being generated, the plastic particles cannot be smoothly and intermittently input into a machine barrel, and therefore the product quality is affected.

Description

Technical Field

[0001] The invention relates to the field of injection molding, and in particular to a waste plastic recycling injection molding machine based on a sorting and feeding structure. Background Art

[0002] In modern manufacturing, injection molding machines, as key equipment for plastic processing and molding, play a vital role. Their working process usually involves conveying plastic particles through a hopper into the barrel of a screw extruder where the screw part is located. Then, under the push and heating of the screw, the plastic is melted and injected into the mold cavity, and finally formed into various plastic products.

[0003] However, compared with new raw material particles, the plastic particles obtained after recycling and reprocessing of waste plastics have more complex characteristics. These particles are of different sizes, and the uneven particle size distribution makes their stacking shape in the hopper more irregular, easily resulting in gaps, which in turn hinders the smoothness of material discharge.

[0004] During the actual operation of the injection molding machine, when the plastic particles are stationary in the hopper, the plastic particles are squeezed against each other and adhere to the inner wall of the hopper, resulting in wall hanging. As time goes by and the material accumulates, the particles hanging on the wall continue to accumulate, which not only causes material waste, but also interferes with the normal material discharge path in the hopper. At the same time, some particles stick to each other, forming an arch structure above the hopper outlet, blocking the material channel like a bridge (i.e., bridging phenomenon), making it impossible for the plastic particles to be smoothly and intermittently fed into the barrel. This phenomenon interrupts the continuous production process of the injection molding machine and reduces production efficiency. Uneven material discharge may also lead to uneven quality of injection molded products and increased scrap rate. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a waste plastic recycling injection molding machine based on a sorting and feeding structure, which can effectively solve the problem in the prior art that when plastic particles are statically accumulated in the hopper, they are prone to wall hanging and bridging, resulting in the plastic particles being unable to be smoothly and intermittently fed into the barrel, thus affecting product quality.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A waste plastic recycling injection molding machine based on a sorting and feeding structure, comprising: The sorting part includes a mounting shell, the upper end of the mounting shell is fixedly connected to a hopper, the upper end of the mounting shell is penetrated by a center tube and is rotatably connected, a conical filter is fixedly sleeved on the center tube, and the conical filter is rotatably connected to the mounting shell.

[0007] The dredging part includes a driving assembly, a driving assembly is arranged in an installation shell, the lower end of the installation shell is fixedly connected to a support plate, the lower end of the central tube is fixedly connected to a vent seat, the vent seat and the support plate are rotatably connected, the vent seat and the driving assembly are commonly connected to a dredging assembly, and the dredging assembly and the central tube are connected to a reducing assembly.

[0008] Among them, the drainage assembly includes a connecting seat, which is rotatably sleeved on the ventilation seat, and the connecting seat and the ventilation seat are commonly connected to a differential module, and a bottom pipe is fixedly connected to the connecting seat, and the bottom pipe is connected to the driving assembly, and a connecting module is installed on the bottom pipe, and a drainage conduit is connected to the connecting module, and a plurality of air outlet grooves are evenly opened along the length direction of the drainage conduit on one side of the inner surface of the hopper circumference.

[0009] Furthermore, the drive assembly includes a No. 1 gear ring, which is rotatably connected in the mounting shell, and the circumferential inner surface of the No. 1 gear ring is fixedly connected to the bottom tube via a connecting plate, and a driving gear that matches the No. 1 gear ring is rotatably connected in the mounting shell, and a driving motor is fixedly connected to the upper end of the driving gear.

[0010] Furthermore, the differential module includes a center gear, which is fixedly mounted on the lower end of the ventilation seat, and the lower end of the connecting seat is fixedly connected to a second ring gear. A connecting gear is meshed between the second ring gear and the center gear, and the connecting gear is rotatably connected to the support plate through a connecting rod.

[0011] Furthermore, the connection module includes a connecting sleeve, which is slidably mounted on the bottom tube. A waist-shaped groove is provided on the upper portion of the circumferential outer surface of the bottom tube, and a circular groove corresponding to the waist-shaped groove is provided on the connecting sleeve. The upper end of the connecting sleeve is fixedly connected to the drainage duct.

[0012] Furthermore, the variable diameter assembly includes a connecting piece, which is fixedly mounted on the drainage duct, and a rotating piece corresponding to the drainage duct is rotatably mounted on the central tube. An air intake module is arranged on the central tube and located at the position of the rotating piece. A pushing module is commonly connected between the rotating piece and the connecting piece, and an air release module is arranged on the central tube.

[0013] Furthermore, the air intake module includes an air intake groove, the air intake groove is opened through the central tube, and the inner surface of the central tube is fixedly connected with an air collecting piece.

[0014] Furthermore, the pushing module includes a guide rod, two guide rods are symmetrically fixedly connected to the upper and lower outer surface of the circumferential surface of the connecting piece, two round tubes corresponding to the guide rods are fixedly connected on the rotating piece, the guide rod is slidably connected in the round tube, and the end of the guide rod located in the round tube is fixedly connected to a piston, and the piston and the round tube are connected by a spring.

[0015] Furthermore, the degassing module comprises a notch, and two long strip notches are symmetrically arranged on the side wall of the central tube, and a filter plate is fixedly connected to the long strip notch.

[0016] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: When the driving component of the present invention is running, the central tube is driven to rotate through the drainage component and the vent seat, thereby driving the conical filter to rotate. On the one hand, the plastic raw materials are screened by centrifugal screening, so that the size of the plastic raw materials falling therein is relatively uniform, so as to reduce the bridging phenomenon caused by size differences. At the same time, the centrifugal screening method can also overcome the interaction force between the various plastic raw materials due to long-term accumulation to a certain extent, so that the various plastic raw materials can be better dispersed and pass through the conical filter. At the same time, the present invention also continuously introduces compressed air into the central tube through the air inlet pipe, and the compressed air enters the drainage duct through the vent seat, the connecting seat, the waist-shaped groove and the circular groove, and finally flows out along the air outlet groove on the drainage duct. The outflowing air will continuously impact the inner wall of the hopper, so that the plastic raw material particles adhering to the inner wall of the hopper are detached. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 The present invention is a schematic diagram of the three-dimensional structure of a waste plastic recycling injection molding machine based on a sorting and feeding structure.

[0019] Figure 2 The present invention is a three-dimensional structural cross-sectional view of a waste plastic recycling injection molding machine based on a sorting and feeding structure.

[0020] Figure 3 It is a three-dimensional structural schematic diagram of the local structure of the dredging part of a waste plastic recycling injection molding machine based on a sorting and feeding structure of the present invention.

[0021] Figure 4 For the present invention Figure 3 A partial enlarged view of point A in the middle.

[0022] Figure 5 It is a three-dimensional structural schematic diagram of an installation of a shell, a hopper, a central tube and a dredging part in a waste plastic recycling injection molding machine based on a sorting and feeding structure of the present invention.

[0023] Figure 6 For the present invention Figure 5A partial enlarged view of point B in the middle.

[0024] The numbers in the figure represent: 1. Sorting part; 11. Mounting shell; 12. Hopper; 13. Center pipe; 14. Conical filter; 2. Dredge part; 21. Drive assembly; 211. No. 1 gear ring; 212. Drive gear; 22. Support plate; 23. Ventilation seat; 24. Dredge assembly; 241. Connecting seat; 242. Differential module; 2421. Center gear; 2422. No. 2 gear ring; 2423. Linking gear; 243. Bottom pipe; 244. Connecting module ; 2441, connecting sleeve; 2442, waist-shaped groove; 2443, circular groove; 245, drainage duct; 2451, air outlet groove; 25, reducing component; 251, connecting piece; 252, rotating piece; 253, air intake module; 2531, air intake groove; 2532, air collecting piece; 254, pushing module; 2541, guide rod; 2542, round tube; 2543, piston; 2544, spring; 255, air release module; 2551, notch; 2552, filter plate. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] The present invention will be further described below in conjunction with the embodiments. Example

[0027] See also Figure 1-Figure 6 , a waste plastic recycling injection molding machine based on a sorting and feeding structure, comprising: The sorting part 1 includes a mounting shell 11, the upper end of the mounting shell 11 is fixedly connected to a hopper 12, a center tube 13 passes through the mounting shell 11 and is rotatably connected, the top of the center tube 13 is rotatably connected to an air inlet pipe through a pipe connector, a conical filter screen 14 is fixedly sleeved on the center tube 13, the conical filter screen 14 is rotatably connected to the mounting shell 11, and the lower end of the mounting shell 11 is fixedly connected to a barrel in an external injection molding machine through a mounting tube.

[0028] The dredging part 2 includes a driving component 21, and the driving component 21 is arranged in the mounting shell 11. The lower end of the mounting shell 11 is fixedly connected to a support plate 22, and the lower end of the central tube 13 is fixedly connected to a vent seat 23, and the vent seat 23 and the support plate 22 are rotatably connected. The vent seat 23 and the driving component 21 are commonly connected with a dredging component 24, and the dredging component 24 and the central tube 13 are connected with a reducing component 25.

[0029] Among them, the drainage component 24 includes a connecting seat 241, which is rotatably mounted on the ventilation seat 23, and the connecting seat 241 and the ventilation seat 23 are commonly connected with a differential module 242. A bottom pipe 243 is fixedly connected to the connecting seat 241, and the bottom pipe 243 is connected to the driving component 21. A connecting module 244 is installed on the bottom pipe 243, and a drainage pipe 245 is connected to the connecting module 244. The drainage pipe 245 has a plurality of air outlet grooves 2451 evenly opened along its length direction on one side of the drainage pipe 245 close to the inner wall of the hopper 12.

[0030] During specific implementation, the driving component 21 is operated, and the central tube 13 is driven to rotate through the guiding component 24 and the vent seat 23, thereby driving the conical filter 14 to rotate. After the granular plastic raw material is passed into the hopper 12, the plastic raw material will first fall on the conical filter 14. When the conical filter 14 rotates, centrifugal force is generated to centrifugally screen the plastic raw material. Particles with larger particle sizes in the plastic raw material are retained on the conical filter 14, and particles in the plastic raw material with particle sizes that meet the requirements pass through the conical filter 14 and continue to fall into the external barrel in the hopper 12, so that the size of the plastic raw material falling therein is relatively uniform. Centrifugal screening of the plastic raw material through the conical filter 14 can also overcome the interaction force generated by long-term accumulation between the various plastic raw materials to a certain extent, so that the various plastic raw materials are better dispersed and pass through the conical filter 14.

[0031] Part of the plastic raw materials that fall into the external barrel will be first conveyed by the screw in the external barrel and then heated. After being melted and becoming liquid, they will be injected into the mold cavity and finally formed into various plastic products. The other part will remain stationary at the bottom of the hopper 12, waiting for the next conveying by the screw. During the period when the plastic raw materials are stationary, due to the irregular shape of the plastic raw materials themselves, the mutual squeezing of the plastic raw materials will cause the particles to stick to each other and thus produce a bridging phenomenon. The plastic raw materials near the edge of the hopper 12 may also adhere to the inner wall of the hopper 12.

[0032] In order to solve the above-mentioned problem, a drainage component 24 is provided in the drainage part 2. When the driving component 21 is in operation, the drainage component 24 is driven to operate synchronously, and the plastic raw material in the hopper 12 is continuously stirred through the drainage duct 245, so that the plastic raw material is always in a flowing state to avoid the occurrence of bridging phenomenon. At the same time, compressed air is continuously transported in the central pipe 13 in the air inlet pipe. The compressed air forms an airflow and flows from top to bottom, passes through the ventilation seat 23, the connecting seat 241 and the connecting module 244 in turn, and finally enters the drainage duct 245, and finally flows out along the air outlet groove 2451 on the drainage duct 245. The outflowing air will continuously flush the inner wall of the hopper 12, so that the plastic particles adhering to the inner wall of the hopper 12 are detached.

[0033] The driving assembly 21 includes a number one gear ring 211, which is rotatably connected in the mounting shell 11. The circumferential inner surface of the number one gear ring 211 is fixedly connected to the bottom tube 243 via a mounting plate. A driving gear 212 that matches the number one gear ring 211 is rotatably connected in the mounting shell 11, and a driving motor is fixedly connected to the upper end of the driving gear 212.

[0034] The differential module 242 includes a central gear 2421, which is fixedly sleeved on the lower end of the ventilation seat 23. The lower end of the connecting seat 241 is fixedly connected with a second ring gear 2422. The second ring gear 2422 and the central gear 2421 are meshed with a connecting gear 2423, and the connecting gear 2423 is rotatably connected to the support plate 22 through a connecting rod.

[0035] The connecting module 244 includes a connecting sleeve 2441, which is slidably mounted on the bottom tube 243. A waist-shaped groove 2442 is provided on the outer surface of the circumference of the bottom tube 243 and at the upper position. A circular groove 2443 corresponding to the waist-shaped groove 2442 is provided on the connecting sleeve 2441. The upper end of the connecting sleeve 2441 is fixedly connected to the drainage duct 245.

[0036] During specific implementation, the driving shaft of the driving motor rotates to drive the driving gear 212, thereby driving the No. 1 gear ring 211 to rotate. The rotation of the No. 1 gear ring 211 drives the connecting seat 241 to rotate synchronously through the mounting plate and the bottom tube 243. When the connecting seat 241 rotates, it drives the No. 2 gear ring 2422 to rotate synchronously, thereby driving the center gear 2421, the ventilation seat 23 and the center tube 13 to rotate synchronously through the interlocking gear 2423. When the center tube 13 rotates, it drives the conical filter screen 14 to rotate synchronously, thereby realizing the above-mentioned screening of plastic raw materials.

[0037] At the same time, in the above transmission process, when the second ring gear 2422 drives the center gear 2421 to rotate through the connecting gear 2423, since the size of the second ring gear 2422 is larger than that of the center gear 2421, the two have the same direction but different rotation speeds, and the rotation speed of the center gear 2421 is greater than that of the second ring gear 2422.

[0038] The reducer assembly 25 includes a connector 251, which is fixedly mounted on the drainage duct 245. A rotating member 252 corresponding to the drainage duct 245 is rotatably mounted on the central tube 13. An air intake module 253 is arranged on the central tube 13 at the position of the rotating member 252. A pushing module 254 is commonly connected between the rotating member 252 and the connector 251. An air release module 255 is arranged on the central tube 13.

[0039] The air intake module 253 includes an air intake groove 2531 . The central tube 13 is provided with the air intake groove 2531 . The inner circumferential surface of the central tube 13 is fixedly connected with an air collecting member 2532 in communication with the air intake groove 2531 .

[0040] The pushing module 254 includes a guide rod 2541, and two guide rods 2541 are symmetrically fixedly connected to the upper and lower outer surface of the circumferential surface of the connecting member 251. The rotating member 252 is composed of a cylindrical tube rotatably sleeved on the central tube 13 and a strip-shaped cavity structure fixedly connected to the circumferential outer surface of the cylindrical tube. Two circular tubes 2542 corresponding to the guide rod 2541 are symmetrically fixedly connected on the strip-shaped cavity structure. The guide rod 2541 is slidably connected in the circular tube 2542, and the end of the guide rod 2541 located in the circular tube 2542 is fixedly connected to the piston 2543, and the piston 2543 and the circular tube 2542 are connected by a spring 2544.

[0041] The degassing module 255 includes a notch 2551. Two notches 2551 that cooperate with the rotating member 252 are symmetrically arranged on the upper and lower side walls of the central tube 13. Half of the notch 2551 is located inside the rotating member 252, and the other half of the notch 2551 is located outside the rotating member 252 and connected to the hopper 12. A filter plate 2552 is fixedly connected in the notch 2551 for preventing plastic raw materials from entering the notch 2551.

[0042] During specific implementation, compressed air is continuously introduced into the central tube 13 through the air inlet pipe, and the compressed air enters the drainage duct 245 through the vent seat 23, the connecting seat 241, the waist-shaped groove 2442 and the circular groove 2443 to form an airflow, and finally flows out along the air outlet groove 2451 on the drainage duct 245. The airflow will continuously flush the inner wall of the hopper 12, so that the plastic raw material particles adhering to the inner wall of the hopper 12 are separated. At the same time, since the bottom tube 243 continues to rotate under the action of the No. 1 gear ring 211 and the mounting plate, the drainage duct 245 also rotates synchronously. On the one hand, its cleaning range is expanded to various positions on the inner wall of the hopper 12. On the other hand, it will also stir the plastic raw material stationary at the bottom of the hopper 12 to enhance its fluidity and prevent the occurrence of bridging.

[0043] When the drainage duct 245 rotates, it will also drive the rotating part 252 to rotate synchronously through the guide rod 2541 and the circular tube 2542. During the rotation of the rotating part 252, when the air inlet groove 2531 is aligned with the strip-shaped cavity structure, since the incoming airflow always flows from top to bottom in the central tube 13, and the opening of the air collecting part 2532 is upward, the flowing air will quickly enter the air inlet groove 2531 along the air collecting part 2532, and then enter the circular tube 2542 along the strip-shaped cavity structure, pushing the piston 2543 and the guide rod 2541 to move away from the central tube 13, and then push the drainage duct 245 and the connecting sleeve 2441 to move toward the inner wall of the hopper 12. Since the distance between the two is reduced, the airflow discharged through the air outlet groove 2451 can act on the inner wall of the hopper 12 more concentratedly, and the cleaning effect is also better, which can remove some plastic raw materials with higher viscosity.

[0044] Under the action of the differential module 242, due to the speed difference between the central gear 2421 and the second ring gear 2422, there is also a speed difference between the rotating member 252 and the central tube 13. During the differential rotation of the two, the air inlet groove 2531 and the strip-shaped cavity structure will be dislocated with each other. However, since the flow rate of the airflow in the central tube 13 is relatively stable, the air pressure in the central tube 13 is also relatively stable and greater than the air pressure in the hopper 12. Therefore, during the dislocation of the two, the air pressure in the circular tube 2542 is also relatively stable, and the position of the drainage duct 245 will not change. In this state, the spring 2544 is in a compressed state, and then as the rotating member 252 and the central tube 13 continue to rotate differentially, the strip-shaped cavity structure will gradually align with the recess 2551. The strip-shaped cavity structure is connected to the hopper 12 through the recess 2551, and its internal pressure is reduced and restored to the atmospheric pressure state. Then, the piston 2543 is also reset under the action of the spring 2544, and the drainage rod 2541 is also reset synchronously.

[0045] During the movement of the drainage duct 245, the inner diameter of the circular motion will also change, and thus the stirring path will also change, so that the stirring can be more sufficient, thereby achieving a better stirring effect.

[0046] It is worth mentioning that the above-mentioned waste plastic recycling injection molding machine based on the sorting and feeding structure has the following advantages: Advantage 1: The driving component 21 is in operation, which drives the central tube 13 to rotate through the drainage component 24 and the vent seat 23, thereby driving the conical filter 14 to rotate. On the one hand, the size of the plastic raw materials falling therein is made relatively uniform through centrifugal screening. At the same time, the centrifugal screening method can also overcome the interaction force between the various plastic raw materials caused by long-term accumulation to a certain extent, so that the various plastic raw materials can be better dispersed and pass through the conical filter 14.

[0047] Advantage 2: Compressed air is continuously introduced into the central tube 13 through the air inlet pipe, and the compressed air enters the drainage duct 245 through the vent seat 23, the connecting seat 241, the waist-shaped groove 2442 and the circular groove 2443, and finally flows out along the air outlet groove 2451 on the drainage duct 245. The outflowing air will continuously impact the inner wall of the hopper 12, so that the plastic raw material particles adhering to the inner wall of the hopper 12 are detached. At the same time, under the synchronous action of the airflow, the differential module 242 and the reducer assembly 25, the relative position of the drainage duct 245 on the bottom tube 243 will change periodically, and its stirring path will also change synchronously, thereby improving the stirring effect.

[0048] Advantage three: since both the central tube 13 and the rotating member 252 are in a rotating state and there is a speed difference between the two, the speed difference is related to the size of the second gear ring 2422 and the central gear 2421 in the differential module 242, and can be adjusted within a certain range. When the speed difference between the two is lower than a certain value, the relative position between the central tube 13 and the rotating member 252 is changed from the state where the air inlet groove 2531 is aligned with the strip cavity structure to the state where the air inlet groove 2531 is aligned with the recess 2551. The rotation angle of the drainage duct 245 is greater than three hundred and sixty degrees, thereby ensuring that it can clean various positions of the inner wall of the hopper 12 when it is close to the inner wall of the hopper 12, thereby preventing the generation of cleaning dead corners.

[0049] Advantage 4: Since the lower end of the hopper 12 is connected to the external barrel, and the interior of the external barrel is in a relatively closed state under the action of the screw, the airflow guided out from the drainage duct 245 will pass through the conical filter 14 upward and finally overflow from the upper end of the hopper 12. The airflow will play a certain role in clearing the conical filter 14 in the process of passing through the conical filter 14, thereby preventing the plastic raw materials from being stuck in the mesh of the conical filter 14 and causing the conical filter 14 to be blocked.

[0050] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A waste plastic recycling injection molding machine based on a sorting and feeding structure, characterized in that: include: A sorting section (1), the sorting section (1) comprising a mounting shell (11), the upper end of the mounting shell (11) being fixedly connected to a hopper (12), the upper end of the mounting shell (11) being penetrated by a center tube (13) and being rotatably connected thereto, a conical filter screen (14) being fixedly sleeved on the center tube (13), the conical filter screen (14) being rotatably connected to the mounting shell (11); A dredging portion (2), the dredging portion (2) comprising a driving assembly (21), the driving assembly (21) being arranged in a mounting shell (11), the lower end of the mounting shell (11) being fixedly connected to a support plate (22), the lower end of the central tube (13) being fixedly connected to a vent seat (23), the vent seat (23) and the support plate (22) being rotatably connected, the vent seat (23) and the driving assembly (21) being commonly connected to a dredging assembly (24), the dredging assembly (24) and the central tube (13) being connected to a reducing assembly (25); The drainage assembly (24) comprises a connecting seat (241), the connecting seat (241) is rotatably sleeved on the ventilation seat (23), a differential module (242) is commonly connected to the connecting seat (241) and the ventilation seat (23), a bottom tube (243) is fixedly connected to the connecting seat (241), the bottom tube (243) and the driving assembly (21) are connected, a connecting module (244) is installed on the bottom tube (243), a drainage conduit (245) is connected to the connecting module (244), and a plurality of air outlet grooves (2451) are evenly opened along the length direction of the drainage conduit (245) on one side of the inner surface of the circumference of the hopper (12).

2. The waste plastic recycling injection molding machine based on the sorting and feeding structure according to claim 1 is characterized in that: The driving assembly (21) comprises a first gear ring (211), the first gear ring (211) being rotatably connected in the mounting housing (11), the circumferential inner surface of the first gear ring (211) being fixedly connected to the bottom tube (243) via a connecting plate, a driving gear (212) matching the first gear ring (211) being rotatably connected in the mounting housing (11), and a driving motor being fixedly connected to the upper end of the driving gear (212).

3. The waste plastic recycling injection molding machine based on the sorting and feeding structure according to claim 1 is characterized in that: The differential module (242) comprises a central gear (2421), the central gear (2421) being fixedly sleeved on the lower end of the vent seat (23), the lower end of the connecting seat (241) being fixedly connected to a second ring gear (2422), a linkage gear (2423) being meshed between the second ring gear (2422) and the central gear (2421), and the linkage gear (2423) being rotationally connected to the support plate (22) via a connecting rod.

4. The waste plastic recycling injection molding machine based on the sorting and feeding structure according to claim 1 is characterized in that: The connection module (244) comprises a connection sleeve (2441), the connection sleeve (2441) being slidably sleeved on the bottom tube (243), a waist-shaped groove (2442) being provided through the circumferential outer surface of the bottom tube (243) and close to the upper part, a circular groove (2443) corresponding to the waist-shaped groove (2442) being provided on the connection sleeve (2441), and the upper end of the connection sleeve (2441) being fixedly connected to the drainage duct (245).

5. The waste plastic recycling injection molding machine based on the sorting and feeding structure according to claim 1 is characterized in that: The diameter-changing assembly (25) comprises a connecting piece (251), the connecting piece (251) being fixedly sleeved on the drainage duct (245), a rotating piece (252) corresponding to the drainage duct (245) being rotatably sleeved on the central tube (13), an air intake module (253) being arranged on the central tube (13) and located at the position of the rotating piece (252), a pushing module (254) being commonly connected between the rotating piece (252) and the connecting piece (251), and an air discharge module (255) being arranged on the central tube (13).

6. The waste plastic recycling injection molding machine based on the sorting and feeding structure according to claim 5 is characterized in that: The air intake module (253) comprises an air intake groove (2531), the air intake groove (2531) is provided through the central tube (13), and an air collecting member (2532) is fixedly connected to the inner circumferential surface of the central tube (13).

7. The waste plastic recycling injection molding machine based on the sorting and feeding structure according to claim 5 is characterized in that: The pushing module (254) comprises a guide rod (2541), two guide rods (2541) are symmetrically fixedly connected to the outer circumferential surface of the connecting member (251) in an upper and lower manner, two circular tubes (2542) corresponding to the guide rods (2541) are fixedly connected to the rotating member (252), the guide rod (2541) is slidably connected in the circular tube (2542), and a piston (2543) is fixedly connected to the end of the guide rod (2541) located in the circular tube (2542), and the piston (2543) and the circular tube (2542) are connected via a spring (2544).

8. The waste plastic recycling injection molding machine based on the sorting and feeding structure according to claim 5 is characterized in that: The degassing module (255) comprises a notch (2551), and two long strip notches (2551) are symmetrically arranged on the side wall of the central tube (13) in the upper and lower parts, and a filter plate (2552) is fixedly connected to the long strip notches (2551).

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