Plastic processing device and working method thereof

Abstract

The application relates to the raw material conveying field and discloses a plastic processing device and a working method thereof, which comprise a crushing bin, a screening bin, a crushing mechanism and a screening mechanism; the crushing mechanism is arranged in the crushing bin, a feeding port is arranged at the top of the crushing bin, the screening bin is arranged at the bottom of the crushing bin, the screening mechanism is arranged in the screening bin, a plurality of supports are fixedly arranged at the bottom of the screening bin, a driving motor is arranged on the front side wall of the crushing bin, and a transmission mechanism is connected between the driving motor and the crushing bin. The raw material at the bottom of the dust raising groove can be raised through the arrangement of the sieve plate, the dust raising frame, the air blower and the vibration mechanism, the raw material is preliminarily screened, the sieve plate is driven to start vibrating through the vibration mechanism, the raw material at the top of the sieve plate is further screened, meanwhile, the raw material is in a moving state, the sieve plate is prevented from being blocked, and thus multi-stage screening of the raw material is realized.

Description

Technical Field

[0001] This invention relates to the field of plastics processing, and in particular to a plastics processing apparatus and its operating method. Background Technology

[0002] Plastic is a material primarily composed of high-molecular-weight organic compounds. Its form and structure can be freely altered, and it can be synthesized or polymerized from monomer raw materials through condensation reactions. It has a wide range of applications. Plastic products are a general term for everyday and industrial goods made primarily from plastics. This includes products manufactured using processes such as injection molding and thermoforming. During the processing of plastic products, the raw materials need to be crushed.

[0003] Existing plastic processing crushers typically use crushing rollers or blades to pulverize plastics. However, plastic raw materials often become contaminated with difficult-to-crush foreign objects such as metal and gravel during processing or transportation. Existing crushing devices struggle to separate these objects, impacting the quality of the finished plastic product. Therefore, this paper proposes a plastic processing device and its operating method, which can effectively solve the aforementioned problems. Summary of the Invention

[0004] The present invention addresses the technical problem that existing crushing devices are unable to screen out foreign objects such as metals and gravel mixed in with plastic raw materials, and provides a plastic processing device and its working method.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A first aspect of the present invention is to provide a plastic processing apparatus, including a crushing chamber, a screening chamber, a crushing mechanism, and a screening mechanism;

[0007] The crushing mechanism is located inside the crushing chamber, with a feed inlet at the top. The screening chamber is located at the bottom of the crushing chamber, with a screening mechanism inside. Several supports are fixedly installed at the bottom of the screening chamber. A drive motor is installed on the front side wall of the crushing chamber, and a transmission mechanism connects the drive motor to the crushing chamber. The crushing mechanism includes a pair of symmetrically arranged crushing rollers that mesh with each other. The feed inlet is located directly above the crushing rollers. The crushing rollers are rotatably connected to the inner wall of the crushing chamber via a rotating shaft. The input end of the rotating shaft is connected to the output end of the transmission mechanism. A drive wheel is installed between the output end of the drive motor and the outer wall of the transmission mechanism. A driven wheel is rotatably installed on the front side wall of the screening chamber. The diameter of the drive wheel is smaller than that of the driven wheel. The drive wheel and the driven wheel are connected by a chain meshing. A discharge port is located on the side wall of the screening chamber, and a vibration mechanism is installed above the discharge port. The plastic raw material to be processed is added into the crushing chamber through the feed inlet. At the same time, the drive motor is started. When the drive motor rotates, it drives a pair of crushing rollers inside the crushing chamber to rotate in opposite directions around the shaft through the drive device. The raw material falling from the top feed inlet is crushed. The crushed raw material flows into the screening chamber. When the drive motor runs, it drives the drive wheel to rotate. The driven wheel meshing with the drive wheel rotates through the wheel chain. The driven wheel rotates in the direction of the discharge port, which drives the screening mechanism in the screening chamber to screen the raw material. The screened raw material flows out through the discharge port.

[0008] Furthermore, the screening mechanism includes a blower, several sets of dust-collecting frames, and a screen plate. The blower is fixedly installed on the side wall of the screening chamber away from the discharge port. The output end of the blower extends into the interior of the screening chamber. A dust-collecting trough is provided at the bottom inner side of the screening chamber. The dust-collecting trough is semi-cylindrical. A connecting shaft is rotatably installed at the center of the dust-collecting trough. The outer end of the connecting shaft passes through the screening chamber and is fixedly connected to the driven wheel. The dust-collecting frames are fixedly installed on the outer wall of the connecting shaft. Dust-collecting rods are fixedly installed at the outer ends of the dust-collecting frames. Reinforcing ribs are fixedly installed between adjacent dust-collecting frames. When the driven wheel rotates, it drives the connecting shaft to rotate as well. When the connecting shaft rotates, it drives the dust-raising frame connected to its outer wall to rotate, which lifts the raw material at the bottom of the dust-raising trough. During screening, the blower is started to blow air into the screening chamber, so that the lifted raw material is subjected to horizontal wind force. Larger and harder-to-crush metal fragments and other debris in the raw material travel a shorter distance in the horizontal direction and most of them fall back into the dust-raising trough. Smaller and easier-to-crush plastic powders travel a longer distance in the horizontal direction and most of them fall onto the surface of the screen plate at the top of the discharge port.

[0009] Furthermore, the screen plate is movably mounted on the top inner side of the discharge port. A top platform is provided between the dust trough and the discharge port, and a sliding sleeve is slidably mounted on the top of the top platform. The edge of the screen plate near the dust trough is rotatably connected to the top outer wall of the sliding sleeve, and the other edge of the screen plate is movably connected to the inner wall of the screening chamber. When the dust trough rotates, it drives the lower side of the top platform of the sliding sleeve to slide, causing the edge of the screen plate rotatably connected to the sliding sleeve to move downwards. At this time, the screen plate forms an inclined surface facing the dust trough. Under the action of the vibration mechanism, the larger metal and gravel impurities remaining on its surface flow back into the interior of the dust trough for re-screening, thereby improving the screening accuracy.

[0010] Furthermore, the vibration mechanism includes a vibration motor, an eccentric wheel, and a vertical rod. The vibration motor is fixedly mounted on the outer wall of the screening chamber. An output shaft is connected to the output end of the vibration motor, and the other end of the output shaft extends into the screening chamber and is fixedly connected to the center of the eccentric wheel. A connecting rod is horizontally rotatably connected to the end of the eccentric wheel furthest from the output shaft. The other end of the connecting rod is rotatably connected to the top of the vertical rod, and the bottom end of the vertical rod is rotatably connected to the top surface of the screen plate via a universal joint. When the raw material falls onto the screen plate surface, the vibration motor is started, driving the eccentric wheel to rotate via the output shaft. This causes the vertical rod, connected to it via the connecting rod, to move up and down, causing the screen plate, rotatably connected to the bottom of the vertical rod, to vibrate up and down around a sliding sleeve. This further screens the raw material at the top of the screen plate while keeping the material in motion to prevent clogging. Smaller plastic particles pass through the screen plate and flow out through the discharge port, while larger metal particles and gravel are retained on the screen plate surface.

[0011] Furthermore, a sliding mechanism is provided on the top of the platform. This mechanism includes a sliding table, a sliding sleeve movably fitted over the outside of the sliding table, and a telescopic guide rod connecting the top of the sliding table and the inner top of the sliding sleeve. A spring is installed on the outside of the telescopic guide rod. Several locking teeth are evenly arranged on the side wall of the sliding table facing the dust trough. Gears are meshed on the outer sides of the locking teeth, and the center of the gear is fixedly connected to the inner wall of the sliding sleeve via a gear shaft. The end of the gear shaft is rotatably connected to the inner wall of the sliding sleeve. When the sliding sleeve slides downwards along the sliding table, the telescopic guide rod shortens, the spring compresses, generating an elastic force in the opposite direction. This simultaneously drives the gear to move downwards, and through the meshing locking teeth, the gear rotates around the gear shaft in the opposite direction to the dust collection frame.

[0012] Furthermore, a rack is meshed at the bottom of the gear, and a groove is formed on the outer wall of the sliding sleeve facing the dust trough. The rack extends through the sliding sleeve into the groove, and a top block is slidably connected inside the groove. The inner wall of the top block is fixedly connected to the rack. When the gear rotates, it drives the rack at its bottom, which meshes with the gear, to move inward towards the sliding sleeve, causing the top block to move into the groove as the sliding sleeve descends until it disengages from the dust-generating rod.

[0013] Furthermore, the rack is set perpendicular to the slide, and the top block is set with an arc-shaped concave sidewall facing the dust trough, with the size of the top block matching the depth of the groove.

[0014] Furthermore, a waste outlet is located at the center of the bottom of the dust collection trough, and a valve is installed at the bottom of the waste outlet. After screening is completed, the valve is opened, and the impurities screened out in the dust collection trough are discharged through the waste outlet.

[0015] A second aspect of the present invention is to provide a method of operating a plastic processing apparatus, comprising the steps of:

[0016] S1. First, close the valve and add the plastic raw material to be processed into the crushing chamber through the feed inlet, while starting the drive motor.

[0017] S2. When the drive motor rotates, it drives a pair of crushing rollers inside the crushing chamber to rotate in opposite directions around the shaft through the drive device, crushing the raw material falling from the top feed port. The crushed raw material flows into the semi-cylindrical dust trough at the bottom of the screening chamber.

[0018] S3. When the drive motor is running, it drives the drive wheel to rotate, and drives the driven wheel that meshes with it to rotate through the wheel chain. This causes the driven wheel to rotate in the direction of the discharge port, which in turn drives the connecting shaft to rotate. When the connecting shaft rotates, it drives the dust-raising frame connected to its outer wall to start rotating, which raises the raw material at the bottom of the dust-raising trough.

[0019] S4. At this time, start the blower to blow air into the screening chamber, so that the raw materials that are raised are subjected to horizontal wind force. The larger and harder-to-break metal fragments and other debris in the raw materials move a shorter distance in the horizontal direction and most of them fall back into the dust trough. The smaller and easier-to-break plastic powders move a longer distance in the horizontal direction and most of them fall onto the surface of the screen plate at the top of the discharge port.

[0020] S5. When the raw material falls onto the surface of the screen plate, the vibration motor is started, and the output shaft drives the eccentric wheel to start rotating, so that the vertical rod connected to it through the connecting rod starts to move up and down, which drives the screen plate connected to the bottom of the vertical rod to start vibrating up and down around the sliding sleeve, further screening the raw material at the top of the screen plate, while keeping the raw material in motion to prevent clogging of the screen plate. Smaller plastics in the raw material pass through the screen plate and flow out through the discharge port, while larger metals and gravel and other impurities are left on the surface of the screen plate.

[0021] S6. As the dust collection frame continues to rotate, it causes the dust collection rod on its edge to move until it interferes with the top block on the side wall of the sliding sleeve, generating a thrust in opposite directions on the top block, causing the sliding sleeve to slide down the slide table, the telescopic guide rod to shorten, the spring to compress, and generating an elastic force in the opposite direction.

[0022] S7. When the sliding sleeve moves downward, it drives the gear to move downward as well. Through the meshing teeth, the gear drives the gear to rotate around the gear shaft in the opposite direction to the dust frame, which drives the rack at its bottom, which meshes with the gear, to move towards the inside of the sliding sleeve, so that the top block disengages from the dust rod during the descent of the sliding sleeve.

[0023] S8. When the sliding sleeve moves downward, it drives the edge of the screen plate that is rotatably connected to it to move downward. At this time, the screen plate forms an inclined surface facing the dust trough. Under the action of the vibration mechanism, the larger metal and gravel impurities left on its surface flow back into the interior of the dust trough for further screening, thereby improving the screening accuracy.

[0024] S9. After the top block disengages from the dust-raising rod, the sliding sleeve resets under the elastic force of the spring. Repeating the above steps can achieve multiple precise screenings of the raw materials. After screening is completed, open the valve, and the impurities screened out in the dust-raising trough are discharged along the waste outlet.

[0025] Furthermore, the initial position of the sieve plate forms an angle of 10°-30° with the horizontal plane.

[0026] The beneficial effects of this invention are:

[0027] 1. The plastic processing apparatus of the present invention, by being equipped with a dust-raising frame, a blower, and a vibration mechanism, can lift the raw material at the bottom of the dust-raising trough and blow air into the screening chamber through the blower. This causes the lifted raw material to be subjected to horizontal wind force. Larger and harder-to-crush metal fragments and other impurities in the raw material travel a shorter distance horizontally and mostly fall back into the dust-raising trough. Smaller and easier-to-crush plastic powders travel a longer distance horizontally and mostly fall onto the surface of the screen plate at the top of the discharge port. When the raw material falls onto the screen plate surface, the vibration motor is started, and the output shaft drives the eccentric wheel to start rotating. This causes the vertical rod connected to the eccentric wheel to start moving up and down, which in turn causes the screen plate, which is rotated at the bottom of the vertical rod, to vibrate up and down around the sliding sleeve. This further screens the raw material at the top of the screen plate, while keeping the raw material in motion to prevent clogging of the screen plate. Smaller plastic particles pass through the screen plate and flow out through the discharge port, while the remaining larger metal and gravel impurities are left on the screen plate surface, thereby achieving multi-stage screening of the raw material.

[0028] 2. By setting up a sliding sleeve and a top block, the sliding sleeve can be driven to slide down the slide table by the dust-raising rod. When the sliding sleeve moves down, it drives the edge of the screen plate that is rotatably connected to it to move down as well. At this time, the screen plate forms an inclined surface facing the dust-raising trough. Under the action of the vibration mechanism, the larger metal and gravel impurities left on its surface flow back into the interior of the dust-raising trough for re-screening, effectively improving the screening accuracy. Attached Figure Description

[0029] Figure 1This is a schematic diagram of the overall structure of this plastic processing device;

[0030] Figure 2 This is a schematic diagram of the internal structure of this plastic processing device;

[0031] Figure 3 This is an enlarged schematic diagram of the structure at point A of this plastic processing device;

[0032] Figure 4 This is a side view of the vibration mechanism of this plastic processing device;

[0033] Figure 5 This is a schematic diagram of the connection structure between the sliding sleeve and the sliding table of this plastic processing device.

[0034] Explanation of reference numerals in the attached drawings: 1. Crushing chamber; 2. Screening chamber; 3. Support frame; 4. Feed inlet; 5. Discharge outlet; 6. Blower; 7. Transmission mechanism; 8. Driven wheel; 9. Wheel chain; 10. Drive motor; 11. Drive wheel; 12. Connecting shaft; 13. Crushing roller; 14. Rotating shaft; 15. Dust trough; 16. Vibration mechanism; 17. Dust collection frame; 18. Dust collection rod; 19. Reinforcing rib; 20. Vibration motor; 21. Sliding mechanism; 22. Screen plate; 23. Waste outlet; 24. Valve; 25. Output shaft; 26. Eccentric wheel; 27. Connecting rod; 28. Vertical rod; 29. ​​Sliding sleeve; 30. Slide table; 31. Top platform; 32. Gear; 33. Gear; 34. Groove; 35. Top block; 36. Rack; 37. Telescopic guide rod; 38. Spring; 39. Gear shaft. Detailed Implementation

[0035] The following will describe the concept and technical effects of the present invention clearly and completely with reference to the embodiments, so as to fully understand the purpose, features and effects of the present invention.

[0036] like Figure 1-5 As shown, a plastic processing device includes a crushing chamber 1, a screening chamber 2, a crushing mechanism, and a screening mechanism.

[0037] The crushing mechanism is located inside the crushing chamber 1. A feed inlet 4 is located at the top of the crushing chamber 1. A screening chamber 2 is located at the bottom of the crushing chamber 1, and a screening mechanism is located inside the screening chamber 2. Several supports 3 are fixedly installed at the bottom of the screening chamber 2. A drive motor 10 is installed on the front wall of the crushing chamber 1, and a transmission mechanism 7 connects the drive motor 10 to the crushing chamber 1. The crushing mechanism includes a pair of symmetrically arranged crushing rollers 13 that mesh with each other. The feed inlet 4 is located directly above the crushing rollers 13. The crushing roller 13 is rotatably connected to the inner wall of the crushing chamber 1 via a rotating shaft 14. The input end of the rotating shaft 14 is connected to the output end of the transmission mechanism 7. A drive wheel 11 is provided between the output end of the drive motor 10 and the outer wall of the transmission mechanism 7. A driven wheel 8 is rotatably provided on the front side wall of the screening chamber 2. The diameter of the drive wheel 11 is smaller than that of the driven wheel 8. The drive wheel 11 and the driven wheel 8 are connected by a chain 9. A discharge port 5 is provided on the side wall of the screening chamber 2. A vibration mechanism 16 is provided on the upper part of the discharge port 5. Plastic raw materials to be processed are added into the crushing chamber 1 through the feed inlet 4. At the same time, the drive motor 10 is started. When the drive motor 10 rotates, it drives a pair of crushing rollers 13 inside the crushing chamber 1 to rotate in opposite directions around the rotating shaft 14 through the drive device, crushing the raw materials falling from the top feed inlet 4. The crushed raw materials flow into the screening chamber 2. When the drive motor 10 runs, it drives the drive wheel 11 to rotate. The driven wheel 8 meshing with it is driven to rotate through the wheel chain 9, so that the driven wheel 8 rotates in the direction towards the discharge port 5, driving the screening mechanism in the screening chamber 2 to screen the raw materials. The screened raw materials flow out through the discharge port 5.

[0038] The screening mechanism includes a blower 6, several sets of dust-collecting frames 17, and a screen plate 22. The blower 6 is fixedly installed on the side wall of the screening chamber 2 away from the discharge port 5. The output end of the blower 6 extends into the interior of the screening chamber 2. A dust-collecting trough 15 is provided at the bottom inner side of the screening chamber 2. The dust-collecting trough 15 is semi-cylindrical. A connecting shaft 12 is rotatably installed at the center of the dust-collecting trough 15. The outer end of the connecting shaft 12 passes through the screening chamber 2 and is fixedly connected to the driven wheel 8. The dust-collecting frames 17 are fixedly installed on the outer wall of the connecting shaft 12. A dust-collecting rod 18 is fixedly installed at the outer end of the dust-collecting frame 17. A reinforcing rib 19 is fixedly installed between adjacent dust-collecting frames 17. When the driven wheel 8 rotates, it drives the connecting shaft 12 to rotate as well. When the connecting shaft 12 rotates, it drives the dust-raising frame 17 connected to its outer wall to start rotating, raising the raw material at the bottom of the dust-raising trough 15. During screening, the blower 6 is started to blow air into the screening chamber 2, so that the raised raw material is subjected to horizontal wind force. The larger and harder-to-break metal fragments and other debris in the raw material move a shorter distance in the horizontal direction and most of them fall back into the dust-raising trough 15. The smaller and easier-to-break plastic powder moves a longer distance in the horizontal direction and most of it falls on the surface of the screen plate 22 at the top of the discharge port 5.

[0039] The screen plate 22 is movably mounted on the top inner side of the discharge port 5. A top platform 31 is provided between the dust trough 15 and the discharge port 5. A sliding sleeve 29 is slidably mounted on the top of the top platform 31. The edge of the screen plate 22 near the dust trough 15 is rotatably connected to the top outer wall of the sliding sleeve 29, and the other edge of the screen plate 22 is movably connected to the inner wall of the screening chamber 2. When the dust frame 17 rotates, it drives the lower side of the top platform 31 of the sliding sleeve 29 to slide, causing the edge of the screen plate 22, which is rotatably connected to the sliding sleeve 29, to move downward. At this time, the screen plate 22 forms an inclined surface facing the dust trough 15. Under the action of the vibration mechanism 16, the larger metal and gravel impurities remaining on its surface flow back into the interior of the dust trough 15 for re-screening, thereby improving the screening accuracy.

[0040] The vibration mechanism 16 includes a vibration motor 20, an eccentric wheel 26, and a vertical rod 28. The vibration motor 20 is fixedly mounted on the outer wall of the screening chamber 2. The output end of the vibration motor 20 is connected to an output shaft 25. The other end of the output shaft 25 extends into the interior of the screening chamber 2 and is fixedly connected to the center of the eccentric wheel 26. The end of the eccentric wheel 26 away from the output shaft 25 is horizontally rotatably connected to a connecting rod 27. The other end of the connecting rod 27 is rotatably connected to the top of the vertical rod 28. The bottom end of the vertical rod 28 is rotatably connected to the top surface of the screen plate 22 through a universal joint. When the raw material falls onto the surface of the screen plate 22, the vibration motor 20 is started, and the output shaft 25 drives the eccentric wheel 26 to start rotating, causing the vertical rod 28 connected to it via the connecting rod 27 to start moving up and down. This causes the screen plate 22, which is rotated at the bottom of the vertical rod 28, to start vibrating up and down around the sliding sleeve 29, further screening the raw material at the top of the screen plate 22. At the same time, the raw material is in motion to prevent clogging of the screen plate 22. Smaller plastic particles in the raw material pass through the screen plate 22 and flow out through the discharge port 5, while larger metal particles and gravel are left on the surface of the screen plate 22.

[0041] A sliding mechanism 21 is provided on the top of the top platform 31. The sliding mechanism 21 includes a slide platform 30 and a sliding sleeve 29 movably fitted on the outside of the slide platform 30. A telescopic guide rod 37 is connected between the top of the slide platform 30 and the inner top of the sliding sleeve 29. A spring 38 is provided on the outside of the telescopic guide rod 37. Several locking teeth 32 are evenly arranged on the side wall of the slide platform 30 facing the dust trough 15. A gear 33 is meshed on the outer side of the locking teeth 32. The center of the gear 33 is fixedly connected to the inner wall of the sliding sleeve 29 through the gear 33 shaft. The end of the gear 33 shaft is rotatably connected to the inner wall of the sliding sleeve 29. When the sliding sleeve 29 slides down along the slide platform 30, the telescopic guide rod 37 shortens, the spring 38 is compressed, generating an elastic force in the opposite direction, which drives the gear 33 to move downward. Through the locking teeth 32 meshing with it, the gear 33 is driven to rotate around the gear 33 shaft in the opposite direction to the dust frame 17.

[0042] A rack 36 is meshed at the bottom of the gear 33. A groove 34 is formed on the outer wall of the sliding sleeve 29 facing the dust trough 15. The rack 36 extends through the sliding sleeve 29 into the groove 34. A top block 35 is slidably connected inside the groove 34, and the inner side wall of the top block 35 is fixedly connected to the rack 36. When the gear 33 rotates, it drives the rack 36, which meshes with the gear 33, to move inward towards the sliding sleeve 29. This causes the top block 35 to move into the groove 34 as the sliding sleeve 29 descends, until it disengages from the dust-generating rod 18.

[0043] The rack 36 is set perpendicular to the slide 30, and the top block 35 is set with an arc-shaped concave sidewall facing the dust trough 15. The size of the top block 35 matches the depth of the groove 34.

[0044] A waste inlet 23 is provided at the center of the bottom of the dust trough 15, and a valve 24 is provided at the bottom of the waste inlet 23. After screening is completed, the valve 24 is opened, and the impurities screened out in the dust trough 15 are discharged along the waste inlet 23.

[0045] Working principle: First, close valve 24 and add the plastic raw material to be processed into the crushing chamber 1 through the feed inlet 4. At the same time, start drive motor 10. When drive motor 10 rotates, it drives a pair of crushing rollers 13 inside the crushing chamber 1 to rotate in opposite directions around the rotating shaft 14, crushing the raw material falling from the top feed inlet 4. The crushed raw material flows into the semi-cylindrical dust trough 15 at the bottom of the screening chamber 2. When drive motor 10 runs, it also drives drive wheel 11 to rotate, which drives driven wheel 8 to rotate through chain 9. This causes driven wheel 8 to rotate in the direction towards the discharge port 5, driving connecting shaft 12 to rotate. When connecting shaft 12 rotates, it drives the dust frame 17 connected to its outer wall to start rotating, thus moving the dust trough 15. 5. The raw material at the bottom is lifted up; at this time, the blower 6 is started to blow air into the screening chamber 2, so that the lifted raw material is subjected to horizontal wind force. The larger and harder-to-crush metal fragments and other debris in the raw material travel a shorter distance horizontally and most of them fall back into the dust trough 15. The smaller and easier-to-crush plastic powder travels a longer distance horizontally and most of it falls onto the surface of the screen plate 22 at the top of the discharge port 5. When the raw material falls onto the surface of the screen plate 22, the vibration motor 20 is started, which drives the eccentric wheel 26 to rotate through the output shaft 25. This causes the vertical rod 28 connected to it through the connecting rod 27 to start moving up and down, which drives the screen plate 22, which is rotated at the bottom of the vertical rod 28, to start vibrating up and down around the sliding sleeve 29. This vibrates the raw material at the top of the screen plate 22. Further screening is performed, while keeping the raw material in motion to prevent clogging of the screen plate 22. Smaller plastic particles pass through the screen plate 22 and flow out through the discharge port 5, while larger metal particles and gravel are left on the surface of the screen plate 22. As the dust collection frame 17 continues to rotate, it drives the dust collection rod 18 along its edge to move until it interferes with the top block 35 on the side wall of the sliding sleeve 29, generating a counter-pushing force on the top block 35. This causes the sliding sleeve 29 to slide downwards along the slide table 30, shortening the telescopic guide rod 37 and compressing the spring 38, generating a spring force in the opposite direction. As the sliding sleeve 29 moves downwards, it drives the gear 33 to move downwards as well. Through the meshing teeth 32, the gear 33 is driven to rotate around the gear 33 axis in the opposite direction to the dust collection frame 17, driving the bottom of the gear 33 to rotate. The rack 36, meshing with the gear 33, moves inward toward the sliding sleeve 29, causing the top block 35 to disengage from the dust-raising rod 18 as the sliding sleeve 29 descends. As the sliding sleeve 29 moves downward, it drives the edge of the sieve plate 22, which is rotatably connected to it, to move downward as well. At this time, the sieve plate 22 forms an inclined surface facing the dust-raising trough 15. Under the action of the vibration mechanism 16, larger metal and gravel impurities remaining on its surface flow back into the dust-raising trough 15 for further screening, improving screening accuracy. After the top block 35 disengages from the dust-raising rod 18, the sliding sleeve 29 resets under the elastic force of the spring 38. Repeating the above steps allows for multiple precise screenings of the raw materials. After screening is complete, the valve 24 is opened, and the impurities screened out of the dust-raising trough 15 are discharged through the waste outlet 23.

[0046] The above embodiments are only some embodiments of the present invention, and not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention.

Claims

1. A plastic processing apparatus, characterized in that: It includes a crushing chamber (1), a screening chamber (2), a crushing mechanism, and a screening mechanism; The crushing mechanism is located inside the crushing chamber (1). A feed inlet (4) is provided at the top of the crushing chamber (1). The screening chamber (2) is located at the bottom of the crushing chamber (1). The screening mechanism is located inside the screening chamber (2). Several supports (3) are fixedly provided at the bottom of the screening chamber (2). A drive motor (10) is provided on the front side wall of the crushing chamber (1). A transmission mechanism (7) is connected between the drive motor (10) and the crushing chamber (1). The crushing mechanism includes a pair of symmetrically arranged crushing rollers (13). The crushing rollers (13) mesh with each other. The feed inlet (4) is located directly above the crushing rollers (13). In this configuration, the crushing roller (13) is rotatably connected to the inner wall of the crushing chamber (1) via a rotating shaft (14). The input end of the rotating shaft (14) is connected to the output end of the transmission mechanism (7). A drive wheel (11) is provided between the output end of the drive motor (10) and the outer wall of the transmission mechanism (7). A driven wheel (8) is rotatably provided on the front side wall of the screening chamber (2). The diameter of the drive wheel (11) is smaller than that of the driven wheel (8). The drive wheel (11) and the driven wheel (8) are meshed and connected by a wheel chain (9). A discharge port (5) is provided on the side wall of the screening chamber (2). A vibration mechanism (16) is provided on the upper part of the discharge port (5). The screening mechanism includes a blower (6), several sets of dust collection frames (17) and a screen plate (22). The blower (6) is fixedly installed on the side wall of the screening chamber (2) away from the discharge port (5). The output end of the blower (6) extends into the interior of the screening chamber (2). A dust collection trough (15) is provided at the bottom of the inner side of the screening chamber (2). The dust collection trough (15) is semi-cylindrical. A connecting shaft (12) is rotatably provided at the center of the dust collection trough (15). The outer end of the connecting shaft (12) passes through the screening chamber (2) and is fixedly connected to the driven wheel (8). The dust collection frames (17) are fixedly installed on the outer wall of the connecting shaft (12). A dust collection rod (18) is fixedly provided at the outer end of the dust collection frame (17). A reinforcing rib (19) is fixedly provided between adjacent dust collection frames (17). The screen plate (22) is movably disposed on the inner top of the discharge port (5). A top platform (31) is provided between the dust trough (15) and the discharge port (5). A sliding sleeve (29) is slidably disposed on the top of the top platform (31). The side edge of the screen plate (22) near the dust trough (15) is rotatably connected to the top of the outer wall of the sliding sleeve (29). The other side edge of the screen plate (22) is movably connected to the inner wall of the screening chamber (2). The top of the top platform (31) is provided with a sliding mechanism (21). The sliding mechanism (21) includes a slide (30). The sliding sleeve (29) is movably sleeved on the outside of the slide (30). A telescopic guide rod (37) is connected between the top of the slide (30) and the inner top of the sliding sleeve (29). A spring (38) is provided on the outside of the telescopic guide rod (37). A number of teeth (32) are evenly arranged on the side wall of the slide (30) facing the dust trough (15). A gear (33) is meshed on the outside of the teeth (32). The center of the gear (33) is fixedly connected to the inner wall of the sliding sleeve (29) through a gear shaft (39). The end of the gear shaft (39) is rotatably connected to the inner wall of the sliding sleeve (29). The bottom of the gear (33) is provided with a rack (36) meshing with it. The outer wall of the sliding sleeve (29) facing the dust trough (15) has a groove (34). The rack (36) extends through the sliding sleeve (29) into the inside of the groove (34). A top block (35) is slidably connected inside the groove (34). The inner side wall of the top block (35) is fixedly connected to the rack (36). The rack (36) is perpendicular to the slide (30), and the top block (35) is arranged with an arc-shaped concave sidewall facing the dust trough (15). The size of the top block (35) matches the depth of the groove (34).

2. The plastic processing apparatus according to claim 1, characterized in that: The vibration mechanism (16) includes a vibration motor (20), an eccentric wheel (26), and a vertical rod (28). The vibration motor (20) is fixedly installed on the outer wall of the screening chamber (2). The output end of the vibration motor (20) is connected to an output shaft (25). The other end of the output shaft (25) extends into the interior of the screening chamber (2) and is fixedly connected to the center of the eccentric wheel (26). The end of the eccentric wheel (26) away from the output shaft (25) is horizontally rotatably connected to a connecting rod (27). The other end of the connecting rod (27) is rotatably connected to the top end of the vertical rod (28). The bottom end of the vertical rod (28) is rotatably connected to the top surface of the screen plate (22) through a universal joint.

3. The plastic processing apparatus according to claim 1, characterized in that: The dust trough (15) has a waste outlet (23) at the bottom center, and a valve (24) is provided at the bottom of the waste outlet (23).

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