A recycling screening device and a drum screening method for plastic bottle fragments

Abstract

The present application relates to the technical fields of plastic recycling screening, and discloses a recycling screening device and a drum screening method for plastic bottle fragments. During the conveying process of the lifting conveying mechanism, the spraying cleaning mechanism can spray cleaning agent to one side of the lifting conveying mechanism, and the cleaning agent is mixed with the material to be screened during the conveying process of the lifting conveying mechanism to clean the material to be screened. The material to be screened is conveyed to one side of the friction cleaning mechanism while being air-dried in the vibration air-drying mechanism. When the material to be screened passes through the friction cleaning mechanism, friction is generated between the material to be screened and the friction cleaning mechanism, so that the impurities adhered to the outside of the material are intercepted by the friction cleaning mechanism, thereby effectively ensuring the purity of the material before screening and avoiding the mixing of impurities to more effectively screen the material. Finally, the material to be screened enters the inside of the grading screening drum, is separated by the grading screening drum, and is graded and output from the grading output mechanism.

Description

Technical Field

[0001] This invention relates to the field of plastic recycling and screening technology, specifically to a recycling and screening device and a drum screening method for plastic bottle fragments. Background Technology

[0002] Recycling screening devices are equipment used to separate and screen waste of different types or sizes, and are widely used in the recycling industry for materials such as plastics, metals, and glass. With increasing global awareness of environmental protection and emphasis on resource recycling, the demand for recycling screening devices is constantly growing.

[0003] Among various recycling and screening equipment, drum screening is a common screening technology that separates materials according to particle size through the rotation of the drum. This method is suitable for screening and filtering various materials and has advantages such as high screening efficiency, strong stability, and low noise. In the recycling process of plastic bottle fragments, drum screening can effectively separate fragments of different sizes, improving recycling efficiency and product quality.

[0004] To improve the usability of plastics, recycled plastic bottle fragments need to be crushed into small particles or fragments. However, due to the different uses and sources of the plastic bottle fragments, a large number of impurities or plastic bottle labels adhere to the outside of the crushed plastic bottle fragments. As a result, when screening, the impurities and labels are still attached to the outside of the plastic bottle fragments, making them unusable directly and greatly affecting the accuracy of plastic bottle fragment screening. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a recycling screening device and a drum screening method for plastic bottle fragments.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A recycling and screening device includes: a feeding trough, a lifting and conveying mechanism, a vibrating drying mechanism, a friction cleaning mechanism, a grading and screening drum, and a grading and output mechanism. The feeding end of the lifting and conveying mechanism extends into the bottom of the feeding trough, and a spray cleaning mechanism is provided at the top of the lifting and conveying mechanism. The discharge end of the lifting and conveying mechanism is located above one side of the vibrating drying mechanism, the friction cleaning mechanism is located on the other side of the lifting and conveying mechanism, and the grading and screening drum is rotatably mounted on top of the grading and output mechanism. As the crushed material to be screened gradually moves along the conveying direction of the lifting and conveying mechanism, the spray cleaning mechanism can spray cleaning liquid onto the material. The cleaning solution and the material are mixed during the conveying process of the lifting conveyor mechanism; when the material carrying the cleaning solution moves above the vibrating drying mechanism, it is poured from the lifting conveyor mechanism into the vibrating drying mechanism. The vibrating drying mechanism can dry the material while conveying it to one side of the friction cleaning mechanism. During the process of the material passing through the friction cleaning mechanism, friction is generated between the material and the friction cleaning mechanism to remove the adhering impurities; the material after removing impurities can be conveyed inside the grading and screening drum to the end away from the friction cleaning mechanism, and during the conveying process, it is sorted by the grading and screening drum and output from the grading output mechanism in a graded manner.

[0007] Preferably, the lifting and conveying mechanism includes an external support, which includes a transverse section and a lifting section. A transverse conveyor belt is installed inside the transverse section, and a circulating drive chain is installed inside the lifting section. Several conveying buckets are mounted on the circulating drive chain. One end of the transverse section near the lifting section is positioned above the lifting section. The transverse conveyor belt can convey materials along the direction of the transverse section towards the side near the lifting section. The circulating drive chain can circulate and convey each of the conveying buckets along the direction of the lifting section, and when the conveying bucket passes below the end of the transverse section near the lifting section, the material can fall from the transverse conveyor belt into the conveying bucket.

[0008] Preferably, the lifting and conveying mechanism further includes a circulating drive mechanism, which includes a circulating drive motor, a transverse drive pulley, a plurality of transverse tension pulleys, a lifting drive sprocket, and a plurality of lifting tension sprockets. The output shaft of the circulating drive motor transmits power between the transverse drive pulley and the lifting drive sprocket. The transverse conveyor belt is tensioned outside the transverse drive pulley and the plurality of transverse tension pulleys, and the circulating drive chain is tensioned outside the lifting drive sprocket and the plurality of lifting tension sprockets. The circulating drive motor can drive the transverse conveyor belt and the circulating drive chain to rotate synchronously through the transverse drive pulley and the lifting drive sprocket.

[0009] Preferably, a plurality of mounting seats are provided on the outer side of the circulating drive chain, and the number of mounting seats of each circulating drive chain is the same as the number of conveying buckets; each conveying bucket is provided with a mounting rotating rod on both sides, and the mounting rotating rod is rotatably connected to the corresponding mounting seat through bearings, so that the conveying bucket can swing around the corresponding mounting rotating rod.

[0010] Preferably, each of the mounting bases is provided with a swing limiting plate at its bottom end, and swing limiting blocks are provided on both sides of the conveying bucket and below the mounting rotating rod. The swing limiting blocks can rotate with the conveying bucket around the corresponding mounting rotating rod. When the side of the swing limiting block abuts against the swing limiting plate, the swing limiting plate can limit the swing angle range of the corresponding conveying bucket by restricting the continued rotation of the swing limiting block.

[0011] Preferably, the spray cleaning mechanism includes several cleaning nozzles, all of which are positioned above the lifting section and point towards the side of the circulating drive chain closest to the vibrating drying mechanism. A receiving trough is also provided below the lifting section, and each conveying hopper has drainage holes on its surface, the diameter of which is smaller than the minimum diameter of the material. The cleaning liquid sprayed by the cleaning nozzles can impact the conveying hoppers, driving them to swing around the corresponding mounting rods to mix the cleaning liquid with the material. Excess cleaning liquid can fall through the drainage holes into the receiving trough for collection.

[0012] Preferably, the vibrating air-drying mechanism includes a collection hopper and an air-drying hood. The air-drying hood covers the top of the collection hopper, and a plurality of air-drying fans are provided at the top inside the air-drying hood. The air-drying fans can generate airflow from the air-drying hood in the direction of the collection hopper. A sieve plate is provided at the top inside the collection hopper. The sieve plate is inclined downward toward the friction cleaning mechanism. A vibration drive motor is provided at the bottom outside the collection hopper. A vibration connecting rod is rotatably provided at the bottom of the sieve plate. The end of the vibration connecting rod away from the sieve plate is eccentrically connected to the output shaft of the vibration drive motor.

[0013] Preferably, the friction cleaning mechanism includes two symmetrically arranged friction rollers, which are respectively located on the upper and lower sides of the output end of the screening plate. Each of the two friction rollers has a plurality of electrostatic bristles on its outer side. While the two friction rollers are rotating, the material output from the screening plate can generate friction with the electrostatic bristles, adsorbing impurities on the surface of the material onto the electrostatic bristles.

[0014] Preferably, the grading and screening drum includes an outer drum and a central drive shaft. The central drive shaft is fixed to the outer drum via several drive linkages. A spiral drive plate is provided between two adjacent drive linkages, and each spiral drive plate is in contact with the outer drum. The outer drum includes several screening sub-drums, and the grading output mechanism includes several output guide buckets. Each output guide bucket is respectively located at the lower part of each screening sub-drum. Along the outer drum from the side closest to the friction cleaning mechanism to the side furthest away from the friction cleaning mechanism, the screening particle size of each screening sub-drum increases sequentially, and the particle size of the material output from each output guide bucket also increases sequentially.

[0015] A drum screening method for plastic bottle fragments, using the aforementioned recycling screening device, includes the following steps: The crushed plastic bottle fragments, along with the label fragments adhering to their surfaces, are fed into the feed trough. Plastic bottle fragments and label fragments move gradually along the conveying direction of the lifting conveyor mechanism. At the same time, the spray cleaning mechanism can spray adhesive remover on one side of the lifting conveyor mechanism. The plastic bottle fragments and label fragments are mixed with the adhesive remover during the conveying process of the lifting conveyor mechanism. Under the action of the adhesive remover, the plastic bottle fragments and label fragments separate and are poured from the lifting and conveying mechanism into the vibrating drying mechanism. The vibrating drying mechanism dries the plastic bottle fragments and label fragments while simultaneously conveying them to one side of the friction cleaning mechanism; When plastic bottle fragments and label fragments pass through the friction cleaning mechanism, they can generate friction with the friction cleaning mechanism. The plastic bottle fragments pass through the friction cleaning mechanism, while the label fragments are trapped by the friction cleaning mechanism. Plastic bottle fragments enter the grading and screening drum, and are then sorted and output from the grading and output mechanism.

[0016] Compared with the prior art, the present invention provides a recycling screening device and a drum screening method for plastic bottle fragments, which has the following advantages: 1. In this type of recycling and screening device, under the action of the lifting and conveying mechanism, the material to be screened is conveyed along the feed chute inside the lifting and conveying mechanism to one side of the vibrating drying mechanism. During the conveying process, the spray cleaning mechanism can spray cleaning agent onto one side of the lifting and conveying mechanism. The cleaning agent mixes with the material to be screened during the conveying process of the lifting and conveying mechanism to clean the material to be screened, so that the material to be screened can be thoroughly cleaned. Then, the material to be screened can be poured from the lifting and conveying mechanism into the vibrating drying mechanism. The vibrating drying mechanism dries the material to be screened while conveying it to the friction cleaning mechanism. When the material to be screened passes through the friction cleaning mechanism, friction is generated between it and the friction cleaning mechanism. The material passes through the friction cleaning mechanism, while the impurities adhering to the outside of the material are intercepted by the friction cleaning mechanism, thereby effectively ensuring the purity of the material before screening and avoiding the mixing of impurities for more effective screening. Finally, the material to be screened enters the grading and screening drum, and is sorted and output from the grading output mechanism.

[0017] 2. This type of recycling and screening device, through the setting of a swing limiting plate and a swing limiting block, allows the swing limiting block to rotate around the corresponding mounting rod with the conveyor bucket. When the side of the swing limiting block abuts against the swing limiting plate, the swing limiting plate can limit the swing angle range of the corresponding conveyor bucket by restricting the continued rotation of the swing limiting block. Then, under the impact force of the cleaning liquid sprayed by the cleaning nozzle, the conveyor bucket is driven to swing around the corresponding mounting rod to mix the cleaning liquid with the material. Excess cleaning liquid can fall into the receiving tank through the drain hole for collection. This effectively mixes and cleans the material thoroughly, and also drains the material to a certain extent through the drain hole. This effectively cleans the material before screening and avoids the influence of impurities adhering to the material surface on the screening process.

[0018] 3. This type of recycling and screening device uses an eccentric connection between the end of the vibrating connecting rod away from the screening plate and the output shaft of the vibrating drive motor. Under the drive of the vibrating drive motor, the vibrating connecting rod drives the screening plate to rotate up and down, generating a certain degree of vibration. This vibration separates the materials that are adhering to each other. Furthermore, with the airflow generated by the drying fan from the drying hood to the collection hopper, the cleaning agent on the surface of the material can be fully dried and separated from the material, thus preventing the cleaning agent from adhering to the material and avoiding affecting the effectiveness of the subsequent screening. Attached Figure Description

[0019] Figure 1 This is one of the three-dimensional structural schematic diagrams of a recycling and screening device according to the present invention; Figure 2 This is a second three-dimensional structural schematic diagram of a recycling and screening device according to the present invention; Figure 3 This is a three-dimensional structural diagram of the lifting and conveying mechanism, the vibration drying mechanism, and the friction cleaning mechanism of a recycling and screening device according to the present invention. Figure 4 This is a schematic diagram of the internal structure of the lifting and conveying mechanism, the vibration drying mechanism, and the friction cleaning mechanism of a recycling and screening device according to the present invention. Figure 5 This is a three-dimensional structural diagram of the circulating drive chain and several conveying buckets of a recycling and screening device according to the present invention. Figure 6 For the present invention Figure 5 Enlarged view of part A; Figure 7 For the present invention Figure 5 Enlarged view of part B; Figure 8 This is a three-dimensional structural diagram of the grading screening drum and grading output mechanism of a recycling screening device according to the present invention.

[0020] In the diagram: 1. Feed chute; 2. Lifting and conveying mechanism; 21. External support; 211. Lateral section; 212. Lifting section; 22. Lateral conveyor belt; 23. Circulating drive chain; 231. Mounting base; 232. Swing limit plate; 24. Conveying hopper; 241. Mounting rod; 242. Swing limit block; 243. Drain hole; 25. Circulating drive mechanism; 251. Circulating drive motor; 252. Lateral drive pulley; 253. Lateral tension pulley; 254. Lifting drive sprocket; 2 55. Lifting tension sprocket; 3. Vibration drying mechanism; 31. Collection hopper; 32. Screening plate; 33. Vibration drive motor; 34. Vibration connecting rod; 4. Friction cleaning mechanism; 41. Friction roller; 42. Electrostatic brush; 5. Grading and screening drum; 51. Outer drum; 511. Screening sub-drum; 52. Central drive shaft; 53. Drive connecting rod assembly; 54. Spiral drive plate; 6. Grading output mechanism; 61. Guide hopper; 7. Spray cleaning mechanism; 71. Cleaning nozzle; 72. Receiving tank. Detailed Implementation

[0021] 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.

[0022] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this application proposes a recycling screening device and a drum screening method for plastic bottle fragments. Example

[0023] Please refer to Figures 1-8 A recycling and screening device includes: a feeding trough 1, a lifting and conveying mechanism 2, a vibrating drying mechanism 3, a friction cleaning mechanism 4, a grading and screening roller 5, and a grading and output mechanism 6. The feeding end of the lifting and conveying mechanism 2 extends into the bottom of the feeding trough 1, and a spray cleaning mechanism 7 is provided at the top of the lifting and conveying mechanism 2. The discharge end of the lifting and conveying mechanism 2 is located above one side of the vibrating drying mechanism 3, the friction cleaning mechanism 4 is located on the other side of the lifting and conveying mechanism 2, and the grading and screening roller 5 is rotatably located on top of the grading and output mechanism 6. As the crushed material to be screened gradually moves along the conveying direction of the lifting and conveying mechanism 2, the spray cleaning mechanism 7 can spray water onto the material. The cleaning solution is sprayed and mixed with the material during the conveying process of the lifting conveyor 2. When the material carrying the cleaning solution moves above the vibrating drying mechanism 3, it is poured from the lifting conveyor 2 into the vibrating drying mechanism 3. The vibrating drying mechanism 3 can dry the material while conveying it to the friction cleaning mechanism 4. During the process of the material passing through the friction cleaning mechanism 4, friction is generated between the material and the friction cleaning mechanism 4 to remove the adhering impurities. The material after removing the impurities can be conveyed inside the grading screening drum 5 to the end away from the friction cleaning mechanism 4. During the conveying process, it is sorted by the grading screening drum 5 and output from the grading output mechanism 6.

[0024] In use, the material to be screened is first fed into the feed trough 1 (in actual use, a baffle plate is installed inside the feed trough 1 and above the lifting conveyor 2 to limit the amount of material conveyed from the lifting conveyor 2, reducing the pressure on the washing and screening process at the rear). Under the action of the lifting conveyor 2, the material to be screened is conveyed along the feed trough 1 towards the vibrating drying mechanism 3 inside the lifting conveyor 2. During the conveying process, the spray cleaning mechanism 7 sprays cleaning agent onto one side of the lifting conveyor 2. The cleaning agent mixes with the material to be screened during the conveying process of the lifting conveyor 2 to clean the material, thus enabling the material to be screened to be... After thorough cleaning, the material to be screened is poured from the lifting conveyor 2 into the vibrating drying mechanism 3. The vibrating drying mechanism 3 dries the material while conveying it to the friction cleaning mechanism 4. As the material passes through the friction cleaning mechanism 4, friction is generated between it and the mechanism. The material passes through the friction cleaning mechanism 4, while impurities adhering to the outside of the material are intercepted by the friction cleaning mechanism 4, thus effectively ensuring the purity of the material before screening and avoiding the mixing of impurities for more effective screening. Finally, the material to be screened enters the grading screening drum 5 and is sorted by the grading screening drum 5 before being output from the grading output mechanism 6. Example

[0025] Please refer to Figures 1-7The difference from the above embodiment is that the lifting and conveying mechanism 2 includes an external support 21, which includes a transverse section 211 and a lifting section 212. A transverse conveyor belt 22 is provided inside the transverse section 211, and a circulating drive chain 23 is provided inside the lifting section 212. Several conveying buckets 24 are mounted on the circulating drive chain 23. One end of the transverse section 211 near the lifting section 212 is located above the lifting section 212. The transverse conveyor belt 22 can convey materials along the direction of the transverse section 211 to the side near the lifting section 212. The circulating drive chain 23 can circulate and convey each conveying bucket 24 along the direction of the lifting section 212. When the conveying bucket 24 passes below the end of the transverse section 211 near the lifting section 212, the material can fall from the transverse conveyor belt 22 into the conveying bucket 24.

[0026] The lifting conveyor mechanism 2 also includes a circulating drive mechanism 25, which includes a circulating drive motor 251, a transverse drive pulley 252, several transverse tension pulleys 253, a lifting drive sprocket 254, and several lifting tension sprockets 255. The output shaft of the circulating drive motor 251 transmits power between the transverse drive pulley 252 and the lifting drive sprocket 254 respectively. The transverse conveyor belt 22 is tensioned on the outside of the transverse drive pulley 252 and several transverse tension pulleys 253, and the circulating drive chain 23 is tensioned on the outside of the lifting drive sprocket 254 and several lifting tension sprockets 255. The circulating drive motor 251 can drive the transverse conveyor belt 22 and the circulating drive chain 23 to rotate synchronously through the transverse drive pulley 252 and the lifting drive sprocket 254.

[0027] Therefore, during use, the output shaft of the circulating drive motor 251 simultaneously outputs power between the transverse drive pulley 252 and the lifting drive sprocket 254. This enables the transverse conveyor belt 22, which is tensioned outside the transverse drive pulley 252 and several transverse tension pulleys 253, and the circulating drive chain 23, which is tensioned outside the lifting drive sprocket 254 and several lifting tension sprockets 255, to rotate synchronously. This allows the transverse conveyor belt 22 to continuously transport the material to be screened while simultaneously driving each conveyor bucket 24 to rotate cyclically under the drive of the circulating drive chain 23. Furthermore, as the conveyor bucket 24 passes through the transverse drive pulley 252... When section 211 is below one end of lifting section 212, the material can fall from the transverse conveyor belt 22 into the conveying hopper 24 (in actual use, the differential speed between the transverse drive pulley 252 and the lifting drive sprocket 254, and the collection hopper set below the intersection of the transverse conveyor belt 22 and the circulating drive chain 23 can collect the lost material and re-input it into the feed trough 1, avoiding the loss of some material output from the transverse conveyor belt 22 due to the gap between the various conveying hoppers 24), so that the material to be screened can be conveyed from each conveying hopper 24 to the vibrating drying mechanism 3 at a certain rate.

[0028] A number of mounting seats 231 are provided on the outer side of the circulating drive chain 23, and the number of mounting seats 231 of each circulating drive chain 23 is the same as the number of conveying buckets 24; each conveying bucket 24 is provided with a mounting rod 241 on both sides, and the mounting rod 241 is rotatably connected to the corresponding mounting seat 231 through bearings, so that the conveying bucket 24 can swing around the corresponding mounting rod 241.

[0029] Each mounting base 231 is provided with a swing limiting plate 232 at its bottom end, and swing limiting blocks 242 are provided on both sides of the conveying bucket 24 and below the mounting rotating rod 241. The swing limiting blocks 242 can rotate with the conveying bucket 24 around the corresponding mounting rotating rod 241. When the side of the swing limiting block 242 abuts against the swing limiting plate 232, the swing limiting plate 232 can limit the swing angle range of the corresponding conveying bucket 24 by limiting the continued rotation of the swing limiting block 242.

[0030] The spray cleaning mechanism 7 includes several cleaning nozzles 71, all of which are located above the lifting section 212 and point towards the side of the circulating drive chain 23 near the vibrating drying mechanism 3. A receiving tank 72 is also provided below the lifting section 212. Each conveying bucket 24 has a drain hole 243 on its surface, and the diameter of the drain hole 243 is smaller than the minimum diameter of the material. The cleaning liquid sprayed by the cleaning nozzles 71 can impact the conveying bucket 24, driving the conveying bucket 24 to swing around the corresponding mounting rod 241 to mix the cleaning liquid with the material. Excess cleaning liquid can fall into the receiving tank 72 through the drain hole 243 for collection.

[0031] In use, the swing limiting plate 232 and the swing limiting block 242 are set up so that the swing limiting block 242 rotates with the conveying bucket 24 around the corresponding mounting rod 241. When the side of the swing limiting block 242 abuts against the swing limiting plate 232, the swing limiting plate 232 can limit the swing angle range of the corresponding conveying bucket 24 by limiting the continued rotation of the swing limiting block 242. Then, under the impact force of the cleaning liquid sprayed by the cleaning nozzle 71, the conveying bucket 24 is driven to swing around the corresponding mounting rod 241 to mix the cleaning liquid with the material. Excess cleaning liquid can fall into the receiving tank 72 through the drain hole 243 for collection. This can effectively mix and clean the material with the cleaning liquid, and can also drain the material to a certain extent through the drain hole 243. This can effectively clean the material before screening and avoid the influence of impurities adhering to the material surface on the screening process. Example

[0032] Please refer to Figures 1-4 , Figure 8The difference from the above embodiment is that the vibrating air drying mechanism 3 includes a collection hopper 31 and an air drying hood. The air drying hood is installed on the top of the collection hopper 31. Several air drying fans are installed inside the top of the air drying hood. The air drying fans can generate airflow from the air drying hood to the collection hopper 31. A sieve plate 32 is installed inside the top of the collection hopper 31. The sieve plate 32 is inclined downward toward the friction cleaning mechanism 4. A vibration drive motor 33 is installed at the bottom of the outer side of the collection hopper 31. A vibration connecting rod 34 is rotatably installed at the bottom of the sieve plate 32. The end of the vibration connecting rod 34 away from the sieve plate 32 is eccentrically connected to the output shaft of the vibration drive motor 33.

[0033] In use, the end of the vibrating connecting rod 34 away from the screening plate 32 is eccentrically connected to the output shaft of the vibrating drive motor 33. Under the drive of the vibrating drive motor 33, the vibrating connecting rod 34 drives the screening plate 32 to rotate up and down, generating a certain degree of vibration. This vibration separates the materials that are adhering to each other. Then, with the airflow generated by the drying fan from the drying hood to the collection hopper 31, the cleaning agent on the surface of the material can be fully dried and separated from the material, thus preventing the cleaning agent from adhering to the material and avoiding affecting the effectiveness of the subsequent screening.

[0034] The friction cleaning mechanism 4 includes two symmetrically arranged friction rollers 41, which are respectively located on the upper and lower sides of the output end of the screening plate 32. Several electrostatic bristles 42 are arranged on the outer side of each friction roller 41. While the two friction rollers 41 rotate, the material output from the screening plate 32 rubs against the electrostatic bristles 42, adsorbing impurities on the material surface onto the electrostatic bristles 42. Thus, under the action of the electrostatic bristles 42, impurities on the material surface are adsorbed onto the outer side of the electrostatic bristles 42 through electrostatic force (generated by the mutual friction of the electrostatic bristles 42), preventing impurities on the material surface from affecting the purity of the material after screening. After a period of operation, the electrostatic bristles 42 can be cleaned to restore their adhesiveness, thereby effectively performing the impurity removal function of the friction cleaning mechanism 4.

[0035] The grading and screening drum 5 includes an outer drum 51 and a central drive shaft 52. The central drive shaft 52 is fixed to the outer drum 51 through several drive linkage groups 53. A spiral drive plate 54 is provided between two adjacent drive linkage groups 53, and each spiral drive plate 54 is respectively in contact with the outer drum 51. The outer drum 51 includes several screening sub-drums 511, and the grading output mechanism 6 includes several output guide buckets 61. Each output guide bucket 61 is respectively located at the lower part of each screening sub-drum 511. Along the side of the outer drum 51 closest to the friction cleaning mechanism 4 and towards the side away from the friction cleaning mechanism 4, the screening particle size of each screening sub-drum 511 increases sequentially, and the particle size of the material output from each output guide bucket 61 also increases sequentially.

[0036] In practical use, the central drive shaft 52 is fixed to the outer roller 51 through several drive linkages 53, allowing the entire outer roller 51 to rotate. Through the setting of each spiral drive plate 54, the material entering the outer roller 51 can be driven by each spiral drive plate 54, preventing the material from falling freely due to the inclined screening roller 5 in the prior art, which would not allow for an effective screening time and result in incomplete screening. The material moves from the side close to the friction cleaning mechanism 4 to the side away from the friction cleaning mechanism 4, and thus, under the screening of each screening sub-cylinder 511, it leaves the outer roller 51 and enters the interior of each output guide hopper 61 for screening and separation. Example

[0037] A drum screening method for plastic bottle fragments, using a recycling screening device as described in any one of Examples 1-3, includes the following steps: The crushed plastic bottle fragments, along with the label fragments adhering to the surface of the plastic bottle fragments, are fed into the feed trough 1. Plastic bottle fragments and label fragments move gradually along the conveying direction of the lifting conveyor 2. At the same time, the spray cleaning mechanism 7 can spray adhesive remover on one side of the lifting conveyor 2. The plastic bottle fragments and label fragments are mixed with the adhesive remover during the conveying process of the lifting conveyor 2. Under the action of the adhesive remover, the plastic bottle fragments and label fragments separate and are poured from the lifting and conveying mechanism 2 into the vibrating drying mechanism 3; The vibrating drying mechanism 3 dries the plastic bottle fragments and label fragments while conveying them to one side of the friction cleaning mechanism 4; When plastic bottle fragments and label fragments pass through the friction cleaning mechanism 4, they can generate friction with the friction cleaning mechanism 4. The plastic bottle fragments pass through the friction cleaning mechanism 4, and the label fragments are intercepted by the friction cleaning mechanism 4. Plastic bottle fragments enter the grading and screening drum 5, and are then sorted and output from the grading output mechanism 6.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A recycling and screening device, characterized in that, include: The system includes a feeding trough, a lifting and conveying mechanism, a vibrating and drying mechanism, a friction cleaning mechanism, a grading and screening roller, and a grading and output mechanism. The feeding end of the lifting and conveying mechanism extends into the bottom of the feeding trough, and a spray cleaning mechanism is provided at the top of the lifting and conveying mechanism. The discharge end of the lifting conveyor is located above one side of the vibrating drying mechanism, the friction cleaning mechanism is located on the other side of the lifting conveyor, and the grading screening roller is rotatably located on the top of the grading output mechanism. As the crushed material to be screened gradually moves along the conveying direction of the lifting conveyor, the spray cleaning mechanism can spray cleaning liquid onto the material, and the cleaning liquid and the material mix during the conveying process of the lifting conveyor. When the material carrying the cleaning fluid moves above the vibrating drying mechanism, it is poured from the lifting conveyor into the vibrating drying mechanism. The vibrating drying mechanism can dry the material while conveying it to the friction cleaning mechanism. During the process of the material passing through the friction cleaning mechanism, friction is generated between the material and the friction cleaning mechanism to remove the adhering impurities. The material after impurities are removed can be conveyed inside the grading and screening drum to the end away from the friction cleaning mechanism, and during the conveying process, it is sorted by the grading and screening drum and output from the grading output mechanism in a graded manner. The lifting and conveying mechanism includes an external support, which includes a transverse section and a lifting section. A transverse conveyor belt is installed inside the transverse section, and a circulating drive chain is installed inside the lifting section. Several conveying buckets are mounted on the circulating drive chain. The outer side of the circulating drive chain is provided with a number of mounting seats, and the number of mounting seats of each circulating drive chain is the same as the number of conveying buckets; Each of the conveying buckets is provided with a mounting rod on both sides, and the mounting rod is rotatably connected to the corresponding mounting base through bearings, so that the conveying bucket can swing around the corresponding mounting rod; Each of the mounting bases is provided with a swing limiting plate at its bottom end, and swing limiting blocks are provided on both sides of the conveying bucket and below the mounting rotating rod. The swing limiting block can rotate around the corresponding mounting rod with the conveying bucket. When the side of the swing limiting block abuts against the swing limiting plate, the swing limiting plate can limit the swing angle range of the corresponding conveying bucket by restricting the continued rotation of the swing limiting block.

2. The recycling and screening device according to claim 1, characterized in that: The end of the transverse section near the lifting section is located above the lifting section, and the transverse conveyor belt can transport materials along the direction of the transverse section to the side near the lifting section; The circulating drive chain can circulate and transport each of the conveying buckets along the direction of the lifting section, and when the conveying bucket passes below the end of the transverse section near the lifting section, the material can fall from the transverse conveyor belt into the inside of the conveying bucket.

3. The recycling and screening device according to claim 2, characterized in that: The lifting and conveying mechanism also includes a circulating drive mechanism, which includes a circulating drive motor, a transverse drive pulley, several transverse tension pulleys, a lifting drive sprocket, and several lifting tension sprockets. The output shaft of the cyclic drive motor transmits power between the transverse drive pulley and the lifting drive sprocket. The transverse conveyor belt is tensioned outside the transverse drive pulley and several transverse tension pulleys. The cyclic drive chain is tensioned outside the lifting drive sprocket and several lifting tension sprockets. The cyclic drive motor can drive the transverse conveyor belt and the cyclic drive chain to rotate synchronously through the transverse drive pulley and the lifting drive sprocket.

4. The recycling and screening device according to claim 3, characterized in that: The spray cleaning mechanism includes several cleaning nozzles, all of which are located above the lifting section and point towards the side of the circulating drive chain closest to the vibrating drying mechanism. A receiving trough is also provided below the lifting section, and each of the conveying buckets has drainage holes on its surface. The diameter of each drainage hole is smaller than the minimum diameter of the material. The cleaning fluid sprayed from the cleaning nozzle can impact the conveying bucket, driving the conveying bucket to swing around the corresponding mounting rod to mix the cleaning fluid with the material. Excess cleaning fluid can fall through the drain hole into the receiving tank for collection.

5. The recycling and screening device according to claim 4, characterized in that: The vibrating air drying mechanism includes a collection hopper and an air drying hood. The air drying hood covers the top of the collection hopper, and a number of air drying fans are provided inside the top of the air drying hood. The air drying fans can generate airflow from the air drying hood in the direction of the collection hopper. A sieve plate is provided at the top of the inside of the collection hopper. The sieve plate is inclined downward toward the friction cleaning mechanism. A vibration drive motor is provided at the bottom of the outside of the collection hopper. A vibration connecting rod is rotatably provided at the bottom of the sieve plate. The end of the vibration connecting rod away from the sieve plate is eccentrically connected to the output shaft of the vibration drive motor.

6. A recycling and screening device according to claim 5, characterized in that: The friction cleaning mechanism includes two symmetrically arranged friction rollers, which are respectively located on the upper and lower sides of the output end of the sieve plate, and several electrostatic brush bristles are provided on the outer side of each friction roller. While the two friction rollers are rotating, the material output from the screening plate can generate friction with the electrostatic brush bristles, adsorbing impurities on the surface of the material onto the electrostatic brush bristles.

7. The recycling and screening device according to claim 1, characterized in that: The grading and screening roller includes an outer roller and a central drive shaft. The central drive shaft is fixed to the outer roller through several drive linkage groups. A spiral drive plate is provided between two adjacent drive linkage groups, and each spiral drive plate is respectively in contact with the outer roller. The outer roller includes several screening sub-cylinders, and the grading output mechanism includes several output guide buckets, each of which is respectively arranged at the lower part of each screening sub-cylinder; Along the outer roller from the side closest to the friction cleaning mechanism toward the side furthest from the friction cleaning mechanism, the screening particle size of each screening sub-cylinder increases sequentially, and the particle size of the material output from each output guide hopper also increases sequentially.

8. A drum screening method for plastic bottle fragments, characterized in that, The recycling screening apparatus as described in any one of claims 1-7 includes the following steps: The crushed plastic bottle fragments, along with the label fragments adhering to their surfaces, are fed into the feed trough. Plastic bottle fragments and label fragments move gradually along the conveying direction of the lifting conveyor mechanism. At the same time, the spray cleaning mechanism can spray adhesive remover on one side of the lifting conveyor mechanism. The plastic bottle fragments and label fragments are mixed with the adhesive remover during the conveying process of the lifting conveyor mechanism. Under the action of the adhesive remover, the plastic bottle fragments and label fragments separate and are poured from the lifting and conveying mechanism into the vibrating drying mechanism. The vibrating drying mechanism dries the plastic bottle fragments and label fragments while simultaneously conveying them to one side of the friction cleaning mechanism; When plastic bottle fragments and label fragments pass through the friction cleaning mechanism, they can generate friction with the friction cleaning mechanism. The plastic bottle fragments pass through the friction cleaning mechanism, while the label fragments are trapped by the friction cleaning mechanism. Plastic bottle fragments enter the grading and screening drum, and are then sorted and output from the grading and output mechanism.

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