A plastic drum sorting apparatus

Abstract

This invention discloses a plastic roller sorting device, including a fixed frame, a first roller, a second roller, a third roller, a drive assembly, a vibration mechanism, a mounting shaft, and a feed pipe. The first, second, and third rollers are arranged concentrically, with the second roller located between the first and third rollers. Both the first and second rollers are provided with screen holes, with the diameter of the screen holes in the first roller being larger than that in the second roller. The third roller is a cylindrical structure without screen holes. The drive assembly includes a transmission shaft and a motor. The three rollers are fixed on the transmission shaft, and the motor drives the transmission shaft to rotate. This invention relies on the relative motion between the transmission shaft and the stationary mounting shaft to achieve periodic, targeted striking of the rollers, enabling synchronous anti-clogging cleaning of the first and second rollers. No additional vibration equipment is required, resulting in good anti-clogging effect, significantly reducing the frequency of manual shutdowns for cleaning, and improving continuous screening efficiency.

Description

Technical Field

[0001] This invention discloses a plastic roller sorting device, belonging to the technical field of plastic recycling equipment. Background Technology

[0002] Resource recycling of waste plastic bottles is an important direction for the development of the circular economy. The conventional recycling process of plastic bottles includes recycling and sorting, crushing and washing, dehydration and drying, hot melt extrusion, water-cooled drawing, and pelletizing. Affected by factors such as wear of crusher blades, fluctuations in instantaneous feed rate, deviation of pelletizing blade gap, and material adhesion and impurity, the final plastic pellets produced have large differences in particle size. If they are directly put into injection molding, extrusion and other molding processes, large particles are very likely to cause molding defects such as die blockage, uneven stress in products, air bubbles, and material shortage, which will significantly reduce the product qualification rate. Therefore, it is necessary to use drum screening equipment to classify and screen the mixed plastic particles. Small particles are directly put into production, medium particles are sold or reused as needed, and large particles need to be reprocessed.

[0003] Rotary drum screens are commonly used in plastic granule screening. Existing rotary drum screens typically consist of a fixed screen cylinder and a drive mechanism that rotates the cylinder. Material enters from one end of the screen cylinder; during rotation, particles smaller than the screen aperture diameter pass through the apertures, while larger particles are discharged from the other end. However, existing rotary drum screens commonly suffer from screen aperture clogging. Plastic granules easily become stuck in the apertures during screening, especially when processing granules with a certain degree of stickiness or irregular shapes, where clogging is particularly severe, significantly impacting screening efficiency and quality.

[0004] To address the problem of screen clogging, some improved solutions have been developed in existing technologies. For example, some rotary screens incorporate striking blocks or tapping rods on the outside of the screen cylinder, which vibrate the cylinder to dislodge the clogging particles. However, these solutions often suffer from uneven striking force and inability to cover the entire screen cylinder, resulting in unsatisfactory anti-clogging effects. Furthermore, they can only effectively clear clogging from the outermost part of the screen cylinder. Summary of the Invention

[0005] The purpose of this invention is to solve the problems in the prior art and to provide a plastic roller sorting device.

[0006] The present invention achieves the above objectives through the following technical solution: a plastic roller sorting device, comprising a fixed frame, a first roller, a second roller, a third roller, a drive assembly, a vibration mechanism, a mounting shaft, and a feed pipe;

[0007] The first roller, the second roller, and the third roller are arranged concentrically, with the second roller located between the first roller and the third roller. Both the first roller and the second roller are provided with sieve holes, and the diameter of the sieve holes in the first roller is larger than that in the second roller. The third roller is a cylindrical structure without sieve holes.

[0008] The drive assembly includes a drive shaft and a motor. The three rollers are fixed on the drive shaft. The motor is used to drive the drive shaft to rotate. The drive shaft has a preset tilt angle with the horizontal plane.

[0009] One end of the mounting shaft is rotatably mounted inside the transmission shaft, and the other end is limited by the fixed frame to restrict the degree of rotational freedom. The feed pipe is mounted on the fixed frame and is used to guide the plastic particles to be screened into the first drum.

[0010] The vibration mechanism includes multiple circumferentially distributed movable components. Each movable component includes a movable rod, a limiting block, and a spring. The transmission shaft is provided with a first mounting component. One end of the movable rod is located inside the first mounting component, and the other end passes through a first roller or a second roller. The limiting block is fixed to the movable rod and located outside the corresponding roller. The movable rod is provided with a ring. The spring is sleeved on the outside of the movable rod, and its two ends abut against the ring and the first mounting component, respectively. The mounting shaft is provided with a groove corresponding to the movable component. The groove is located at the top of the cross-section of the mounting shaft, and the groove includes a vertical surface and a guide surface.

[0011] When the drive shaft rotates, the movable rod slides along the guide surface, compressing the spring to store force. When the movable rod slides from the outer circular surface of the mounting shaft to the vertical surface, the spring releases and drives the movable rod to reset, so that the limit block strikes the corresponding roller.

[0012] Preferably, the drive assembly further includes a drive gear and a driven gear, the drive gear being fixed to the output shaft of the motor, and the driven gear being fixed to the transmission shaft and meshing with the drive gear.

[0013] Preferably, the first mounting component includes a first mounting platform and a first disassembly component, which are fixedly connected by bolts. The first mounting platform is disposed on the drive shaft, and the ring is slidably disposed within the first mounting platform and the first disassembly component.

[0014] Preferably, the vibration mechanism is provided in at least two sets along the axial direction of the three rollers, and the moving components in the adjacent sets of vibration mechanisms are staggered.

[0015] Preferably, the vibration mechanism is provided in at least two sets along the axial direction of the three rollers, and the moving components in the adjacent sets of vibration mechanisms are staggered.

[0016] Preferably, the three rollers are fixed to the drive shaft by a second mounting member. The second mounting member includes a second mounting platform and a second disassembly member. The second mounting platform is disposed on the drive shaft. One end of the second disassembly member abuts against the inner wall of the corresponding roller. The second disassembly member is fixed to the corresponding roller and the second mounting platform by bolts.

[0017] Preferably, each of the three rollers is provided with a baffle at one end near the feed pipe. The baffle is an annular structure and has a notch facing the feed pipe.

[0018] Preferably, there are rounded transitions between the vertical surface and the guide surface, between the vertical surface and the outer circular surface of the mounting shaft, and between the guide surface and the outer circular surface of the mounting shaft, and the end of the movable rod that abuts against the mounting shaft has a hemispherical structure.

[0019] Preferably, the limiting block is provided with an elastic buffer pad on the side facing the corresponding roller, and the feed pipe is provided with a feed regulating valve.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] By setting up a vibration mechanism, the moving rod generates an impact force by releasing the force instantaneously after the spring is charged. The impact force is concentrated and effective, which can make the plastic particles blocked in the screen holes fall off smoothly, effectively preventing screen blockage and ensuring screening efficiency. At the same time, the three-layer concentric roller design realizes multi-stage screening in a limited space, improving space utilization. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a plastic roller sorting device according to the present invention;

[0023] Figure 2 This is a cross-sectional view of a plastic roller sorting device according to the present invention;

[0024] Figure 3 This is a cross-sectional view of the roller and vibration mechanism in this invention;

[0025] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0026] Figure 5 This is a cross-sectional view of the roller and the second mounting component in this invention;

[0027] Reference numerals: 1. Fixed frame; 2. Feed pipe; 3. First roller; 4. Second roller; 5. Third roller; 6. Material stop cover; 7. Drive gear; 8. Motor; 9. Driven gear; 10. Transmission shaft; 11. Vibration mechanism; 12. First mounting component; 13. Mounting shaft; 14. Second mounting component; 15. Movable rod; 16. First disassembly component; 17. Limiting block; 18. Groove; 19. First mounting platform; 20. Spring; 21. Ring; 22. Vertical surface; 23. Guide surface; 24. Second mounting platform; 25. Second disassembly component. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] like Figures 1-5 As shown, a plastic roller sorting device includes a fixed frame 1, a first roller 3, a second roller 4, a third roller 5, a drive assembly, a mounting shaft 13, and a vibration mechanism 11. The first roller 3, the second roller 4, and the third roller 5 are arranged concentrically, that is, they have a common axis. The second roller 4 is located between the first roller 3 and the third roller 5. That is, from the inside to the outside, the first roller 3, the second roller 4, and the third roller 5 are arranged in sequence. The first roller 3 and the second roller 4 are both provided with screen holes. The diameter of the screen holes of the first roller 3 is larger than the diameter of the screen holes of the second roller 4, thereby realizing multi-stage screening. The third roller 5 is a cylindrical structure without screen holes, serving as the outermost collection cylinder.

[0030] The drive assembly includes a drive shaft 10 and a motor 8. One end of the drive shaft 10 is rotatably connected to the fixed frame 1 via a bearing, and the drive shaft 10 has a preset angle of inclination with the horizontal plane, so that the feed end is higher than the discharge end, which facilitates the material to move axially under the action of gravity. The first roller 3, the second roller 4, and the third roller 5 are fixedly mounted on the drive shaft 10 and rotate synchronously with the drive shaft 10. The drive assembly also includes a drive gear 7 and a driven gear 9. The drive gear 7 is fixed on the output shaft of the motor 8, and the driven gear 9 is fixed on the drive shaft 10 and meshes with the drive gear 7 for transmission. When the motor 8 drives the drive gear 7 to rotate, the first roller 3, the second roller 4, and the third roller 5 are driven to rotate synchronously through the driven gear 9 and the drive shaft 10.

[0031] One end of the mounting shaft 13 is rotatably mounted inside the transmission shaft 10, meaning one end of the mounting shaft 13 extends into the interior of the transmission shaft 10 and rotates with the transmission shaft 10 via a bearing. The other end is limited to the fixed frame 1 by a limiting device to restrict the rotational freedom of the mounting shaft 13. Specifically, the end of the mounting shaft 13 extending out of the transmission shaft 10 is fixedly connected to the fixed frame 1 by a keyway or pin, so that when the transmission shaft 10 rotates, the mounting shaft 13 remains stationary. The fixed frame 1 is equipped with a feed pipe 2 for guiding the plastic granules to be screened into the first drum 3. The plastic granules enter the interior of the first drum 3 through the feed pipe 2 and move axially under the action of drum rotation and gravity for screening. A feed regulating valve, which can be a slide valve or a rotary valve, can be installed on the feed pipe 2 to control the feed rate by adjusting the valve opening to adapt to different screening conditions and ensure that the equipment operates in the best working state.

[0032] The vibration mechanism 11 is used to apply a striking force to a preset position of the first roller 3 and the second roller 4 when the first roller 3 and the second roller 4 rotate. When the striking force is applied, the preset position rotates to the highest point as the first roller 3 and the second roller 4 rotate. The vibration mechanism 11 includes multiple movable components distributed at circumferential intervals. Each movable component has the same structure and includes a movable rod 15, a limiting block 17, and a spring 20. The transmission shaft 10 has multiple first mounting parts 12 for mounting the movable components. One end of the movable rod 15 is located inside the first mounting part 12, and the other end passes through the first roller 3 or the second roller 4. The limiting block 17 is fixedly connected to the movable rod 15 and is located outside the first roller 3 or the second roller 4. The movable rod 15 has a ring 21 at the position inside the first mounting part 12. The spring 20 is sleeved on the movable rod 15, and the two ends of the spring 20 abut against the ring 21 and the first mounting part 12, respectively. The spring 20 applies a force to the movable rod 15 in the direction of the mounting shaft 13.

[0033] The mounting shaft 13 has a groove 18 located at the position of the vibration mechanism 11. The groove 18 is located at the top of the cross-section of the mounting shaft 13. The groove 18 includes a vertical surface 22 and a guide surface 23. The guide surface 23 connects one end of the vertical surface 22 and the outer circular surface of the mounting shaft 13. The vertical surface 22 and the guide surface 23, as well as the vertical surface 22 and the guide surface 23 and the outer circular surface of the mounting shaft 13, are connected by rounded corners. This rounded corner design can effectively reduce the wear of the hemispherical end of the movable rod 15 during the sliding process, improve the service life and operational stability of the equipment. The end of the movable rod 15 that abuts against the mounting shaft 13 has a hemispherical structure, which allows the sliding between the movable rod 15 and the mounting shaft 13 to be smoother, while reducing wear.

[0034] The first mounting component 12 includes a first mounting platform 19 and a first disassembly component 16. The first mounting platform 19 and the first disassembly component 16 are fixedly connected by bolts. The first mounting platform 19 is set on the drive shaft 10, for example, integrally formed or welded to the drive shaft 10. The ring 21 is slidably set in the first mounting platform 19 and the first disassembly component 16. By setting the first mounting component 12 as a split structure, it is convenient to install, disassemble and perform daily maintenance on the movable rod 15 and the spring 20.

[0035] In this embodiment, at least two sets of vibration mechanisms 11 are arranged along the axial direction of the first roller 3 and the second roller 4. The movable components in the two adjacent sets of vibration mechanisms 11 are staggered, that is, the circumferential installation positions of the movable components in the two adjacent sets of vibration mechanisms 11 are staggered by a certain angle. This allows the impact force to act alternately at different axial and circumferential positions of the roller, so that the vibration effect can cover more areas as much as possible and improve the comprehensiveness of anti-clogging.

[0036] The first roller 3, the second roller 4, and the third roller 5 are fixed to the drive shaft 10 by the second mounting component 14. The second mounting component 14 includes a second mounting platform 24 and a second disassembly component 25. The second mounting platform 24 is disposed on the drive shaft 10, for example, integrally formed or welded to the drive shaft 10. One end of the second disassembly component 25 abuts against the inner wall of the first roller 3, the second roller 4, or the third roller 5, and the second disassembly component 25 is fixed to the corresponding roller and the second mounting platform 24 by bolts. By setting the second mounting component 14 as a split structure, it is convenient to install, disassemble, and replace the rollers.

[0037] The discharge ports of the first roller 3, the second roller 4, and the third roller 5 are located at different positions in the axial direction. Specifically, the discharge port of the second roller 4 is located between the discharge port of the third roller 5 and the discharge port of the first roller 3. The discharge port of the third roller 5 is closest to the feed pipe 2. That is, in the direction from the feed end to the discharge end, the arrangement order of the discharge ports of each roller is as follows: discharge port of the third roller 5, discharge port of the second roller 4, and discharge port of the first roller 3.

[0038] Each of the first roller 3, the second roller 4, and the third roller 5 is equipped with a baffle 6 near the feed pipe 2. The baffle 6 is an annular structure with a notch facing the feed pipe 2. The notch slows down the falling speed and distance of the plastic granules. The plastic granules falling from the rollers first accumulate in the notch and then fall from the edge of the notch. This effectively prevents granules of different sizes from mixing during the falling process. Collectors can be used below the notch to collect granules of different sizes. The plastic granules falling from the third roller 5 have the smallest particle size, which is smaller than the sieve hole diameter of the second roller 4 and can be collected directly as qualified products. The plastic granules falling from the first roller 3 have the largest particle size, which is larger than the sieve hole diameter of the first roller 3 and do not meet the production requirements. They need to be further processed, such as re-crushing or granulating. The plastic granules falling from the second roller 4 have a particle size between the two and can be further processed or sold directly as larger diameter plastic granules according to actual production needs.

[0039] In this embodiment, a sealing assembly can be additionally provided at the position where the movable rod 15 passes through the first roller 3 or the second roller 4. The sealing assembly includes a sealing ring and a pressure cap sleeved on the movable rod 15. The sealing ring is embedded in the roller wall, and the pressure cap is fixed to the outer wall of the roller by bolts and presses the sealing ring tightly. This sealing structure can ensure that the movable rod 15 can slide freely in the radial direction, and can also effectively prevent plastic particles from leaking from the through gap, thus ensuring the screening accuracy.

[0040] The limit block 17 is equipped with a replaceable elastic buffer pad on the side facing the corresponding roller. The elastic buffer pad is made of polyurethane or rubber material. When the limit block 17 hits the roller, the elastic buffer pad first contacts the outer wall of the roller, which plays a buffering role, reduces the impact noise, and avoids rigid collision wear between the limit block 17 and the roller, thus improving the service life of the equipment.

[0041] A dust scraper ring is provided at the entrance of the first mounting component 12. The inner hole of the dust scraper ring slides in fit with the outer peripheral wall of the movable rod 15. The dust scraper ring is made of wear-resistant material and has a dust scraping edge on the edge of its inner hole. When the movable rod 15 slides, the dust scraping edge scrapes off the dust adhering to the surface of the movable rod 15, preventing dust from entering the sliding mating surface and effectively avoiding jamming of the movable rod 15.

[0042] The preset tilt angle between the drive shaft 10 and the horizontal plane is preferably 5°-10°, so that the feed ends of the first roller 3, the second roller 4, and the third roller 5 are higher than the discharge ends, ensuring that the material can move smoothly from the feed end to the discharge end under the action of gravity. The inner wall of the third roller 5 is a smooth surface, which facilitates the smooth sliding of the smallest plastic particles to the discharge port and avoids the particles from being stuck on the inner wall of the third roller 5.

[0043] Working principle: When the motor 8 drives the transmission shaft 10 to rotate, each moving component rotates synchronously with the transmission shaft 10. The hemispherical end of the moving rod 15 always keeps in contact with the outer surface of the mounting shaft 13 under the action of the spring 20. When the moving rod 15 is in the groove 18 position, it slides along the surface of the groove 18.

[0044] When one end of the movable rod 15 contacts the outer circular surface of the mounting shaft 13, the movable rod 15 is pushed outward, that is, away from the axis of the mounting shaft 13, and the spring 20 is compressed and in a stored state. At this time, the limit block 17 does not contact the outer wall of the first roller 3 or the second roller 4.

[0045] When one end of the movable rod 15 rotates with the drive shaft 10 to the groove 18, since the groove 18 is located at the top of the cross-section of the mounting shaft 13, after the hemispherical end of the movable rod 15 passes the vertical surface 22, the resistance force on the movable rod 15 suddenly disappears. Under the elastic force of the spring 20, the movable rod 15 quickly returns to its original position, that is, moves towards the axis of the mounting shaft 13 and abuts against the guide surface 23. This causes the movable rod 15 to drive the limiting block 17 to move rapidly towards the roller. The limiting block 17 abuts against the outer wall of the first roller 3 or the second roller 4, thereby generating an impact force on the first roller 3 or the second roller 4. This impact force is transmitted to the screen hole position through the roller wall, generating a vibration effect on the plastic particles blocking the screen hole, causing the plastic particles to fall out of the screen hole, effectively preventing the screen hole from clogging.

[0046] As the drive shaft 10 continues to rotate, the hemispherical end of the movable rod 15 slides along the guide surface 23. One end of the movable rod 15 gradually moves away from the axis of the mounting shaft 13 and eventually contacts the outer circular surface of the mounting shaft 13. During this process, the ring 21 continues to compress the spring 20 as the movable rod 15 slides, thus starting the next energy storage and preparing for the next vibration. This cycle repeats, and each movable component strikes the roller once during each rotation of the roller, thereby achieving a periodic, high-frequency vibration anti-clogging effect.

[0047] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0048] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A plastic roller sorting device, characterized in that, It includes a fixed frame (1), a first roller (3), a second roller (4), a third roller (5), a drive assembly, a vibration mechanism (11), a mounting shaft (13), and a feed pipe (2); The first roller (3), the second roller (4) and the third roller (5) are arranged concentrically. The second roller (4) is located between the first roller (3) and the third roller (5). The first roller (3) and the second roller (4) are both provided with sieve holes. The diameter of the sieve hole of the first roller (3) is larger than the diameter of the sieve hole of the second roller (4). The third roller (5) is a cylindrical structure without sieve holes. The drive assembly includes a drive shaft (10) and a motor (8). The three rollers are fixed on the drive shaft (10). The motor (8) is used to drive the drive shaft (10) to rotate. The drive shaft (10) has a preset tilt angle with the horizontal plane. One end of the mounting shaft (13) is rotatably mounted inside the transmission shaft (10), and the other end is limited by the fixed frame (1) to restrict the degree of rotational freedom. The feed pipe (2) is mounted on the fixed frame (1) and is used to guide the plastic particles to be screened into the first roller (3). The vibration mechanism (11) includes multiple movable components distributed circumferentially. Each movable component includes a movable rod (15), a limiting block (17), and a spring (20). The transmission shaft (10) is provided with a first mounting component (12). One end of the movable rod (15) is located inside the first mounting component (12), and the other end passes through the first roller (3) or the second roller (4). The limiting block (17) is fixed to the movable rod (15) and located outside the corresponding roller. The movable rod (15) is provided with a ring (21). The spring (20) is sleeved on the outside of the movable rod (15), and both ends abut against the ring (21) and the first mounting component (12) respectively. The mounting shaft (13) is provided with a groove (18) corresponding to the movable component. The groove (18) is located at the top of the cross-section of the mounting shaft (13), and the groove (18) includes a vertical surface (22) and a guide surface (23). When the drive shaft (10) rotates, the movable rod (15) slides along the guide surface (23) and the compression spring (20) stores force. When the movable rod (15) slides from the outer circle of the mounting shaft (13) to the vertical surface (22), the spring (20) releases and drives the movable rod (15) to reset, so that the limit block (17) hits the corresponding roller.

2. The plastic roller sorting device according to claim 1, characterized in that, The drive assembly also includes a drive gear (7) and a driven gear (9). The drive gear (7) is fixed to the output shaft of the motor (8), and the driven gear (9) is fixed to the transmission shaft (10) and meshes with the drive gear (7).

3. The plastic roller sorting device according to claim 1, characterized in that, The first mounting component (12) includes a first mounting platform (19) and a first disassembly component (16), which are fixedly connected by bolts. The first mounting platform (19) is located on the drive shaft (10), and the ring (21) is slidably located within the first mounting platform (19) and the first disassembly component (16).

4. A plastic roller sorting device according to claim 1, characterized in that, The vibration mechanism (11) is provided in at least two sets along the axial direction of the three rollers, and the moving components in the two adjacent sets of vibration mechanisms (11) are staggered.

5. A plastic roller sorting device according to claim 1, characterized in that, The three rollers are fixed to the drive shaft (10) by the second mounting member (14). The second mounting member (14) includes a second mounting platform (24) and a second disassembly member (25). The second mounting platform (24) is located on the drive shaft (10). One end of the second disassembly member (25) abuts against the inner wall of the corresponding roller. The second disassembly member (25) is fixed to the corresponding roller and the second mounting platform (24) by bolts.

6. A plastic roller sorting device according to claim 1, characterized in that, The discharge ports of the three first rollers (3), second rollers (4) and third rollers (5) are located at different positions in the axial direction. The discharge port of the second roller (4) is located between the discharge port of the third roller (5) and the discharge port of the first roller (3). The discharge port of the third roller (5) is closest to the feed pipe (2).

7. A plastic roller sorting device according to claim 6, characterized in that, Each of the three rollers is provided with a baffle (6) at one end near the feed pipe (2). The baffle (6) is an annular structure and has a notch facing the feed pipe (2).

8. A plastic roller sorting device according to claim 1, characterized in that, The vertical surface (22) and the guide surface (23), the vertical surface (22) and the outer circular surface of the mounting shaft (13), and the guide surface (23) and the outer circular surface of the mounting shaft (13) are all provided with rounded transitions. The end of the movable rod (15) that abuts against the mounting shaft (13) has a hemispherical structure.

9. A plastic roller sorting device according to claim 1, characterized in that, The limiting block (17) is provided with an elastic buffer pad on the side facing the corresponding roller, and the feed pipe (2) is provided with a feed regulating valve.

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