Recycling and screening device and roller screening method for plastic bottle fragments

Abstract

The invention relates to the technical field of plastic recycling and screening, and discloses a recycling and screening device and a roller screening method for plastic bottle fragments. In the conveying process of the lifting conveying mechanism, the spraying cleaning mechanism can spray a cleaning agent to one side of the lifting conveying mechanism, and the cleaning agent and the to-be-screened materials are mixed in the conveying process of the lifting conveying mechanism to clean the to-be-screened materials; to-be-screened materials are conveyed to one side of the friction cleaning mechanism while being air-dried in the vibration air-drying mechanism, and friction can be generated between the to-be-screened materials and the friction cleaning mechanism when the to-be-screened materials pass through the friction cleaning mechanism, so that impurities adhering to the outer portions of the materials are intercepted by the friction cleaning mechanism; therefore, the purity of the materials before screening is effectively guaranteed, impurities can be prevented from being mixed into the materials, screening is more effective, and finally the materials to be screened enter the grading screening roller, are sorted by the grading screening roller and are output from the grading output mechanism in a grading mode.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic recycling and screening, in particular to a recycling and screening device and a roller screening method for plastic bottle fragments. Background Art

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

[0003] Among various recycling and screening equipment, drum screening is a common screening technology. This method uses the rotating motion of a drum to separate materials by particle size. This method is suitable for screening and filtering a wide range of materials, offering advantages such as high screening efficiency, strong stability, and low noise. In the recycling of plastic bottle fragments, drum screening can effectively separate fragments of different sizes, improving recycling efficiency and product quality.

[0004] In order to improve the recyclability of plastics, recycled plastic bottle fragments need to be broken into small particles or fragments. However, due to the different uses and sources of plastic bottle fragments, a large amount of impurities or plastic bottle labels are adhered to the outside of the broken plastic bottle fragments. As a result, when screening, the impurities and labels are still adhered to the outside of the plastic bottle fragments, making them unable to be directly utilized, and also greatly affecting the accuracy of plastic bottle fragment screening. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a recycling and screening device and a drum screening method for plastic bottle fragments.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A recycling and screening device comprises: a feed trough, a lifting and conveying mechanism, a vibrating air-drying mechanism, a friction cleaning mechanism, a grading screening drum and a grading output mechanism, wherein the feed end of the lifting and conveying mechanism extends into the bottom of the feed trough, and the top of the lifting and conveying mechanism is provided with a spray cleaning mechanism; the discharge end of the lifting and conveying mechanism is arranged above one side of the vibrating air-drying mechanism, the friction cleaning mechanism is arranged on the other side of the lifting and conveying mechanism, and the grading screening drum is rotatably arranged on the top of the grading output mechanism; during the process that 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 on the material. The cleaning liquid and the material are mixed during the conveying process of the lifting and conveying mechanism; when the material carrying the cleaning liquid moves to the top of the vibrating air-drying mechanism, it is poured from the lifting and conveying mechanism into the inside of the vibrating air-drying mechanism, and the vibrating air-drying mechanism can air-dry the material while conveying it to the side of the friction cleaning mechanism. In the process of the material passing through the friction cleaning mechanism, friction can be generated between the material and the friction cleaning mechanism to remove adhering impurities; the material after impurities are removed can be conveyed inside the grading screening drum to the end away from the friction cleaning mechanism, and in the process of conveying, it is sorted by the grading screening drum and output from the grading output mechanism in a graded manner.

[0008] Preferably, the lifting and conveying mechanism includes an external bracket, the external bracket includes a transverse section and a lifting section, a transverse conveyor belt is arranged inside the transverse section, a circulating drive chain is arranged inside the lifting section, and a plurality of conveying buckets are mounted on the circulating drive chain; the transverse section is arranged above the lifting section at one end close to the lifting section, and the transverse conveyor belt can convey the material along the direction of the transverse section to the side close to the lifting section; the circulating drive chain can circulate the conveying buckets along the direction of the lifting section, and when the conveying bucket passes below one end of the transverse section close to the lifting section, the material can fall from the transverse conveyor belt into the conveying bucket.

[0009] Preferably, the lifting and conveying mechanism also includes a circulating drive mechanism, which includes a circulating drive motor, a transverse drive pulley, several transverse tensioning pulleys, a lifting drive sprocket and several lifting tensioning sprockets; the output shaft of the circulating drive motor transmits power to the transverse drive pulley and the lifting drive sprocket respectively, the transverse conveyor belt is tensioned on the outside of the transverse drive pulley and several transverse tensioning pulleys, the circulating drive chain is tensioned on the outside of the lifting drive sprocket and several lifting tensioning sprockets, and 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.

[0010] Preferably, a plurality of mounting seats are provided on the outer side of the circulating drive chain, and the number of the mounting seats of each circulating drive chain is consistent with the number of the conveying buckets; a mounting rotating rod is provided on both sides of each conveying bucket, and the mounting rotating rods are rotatably connected to the corresponding mounting seats through bearings, and the conveying bucket can swing around the corresponding mounting rotating rod.

[0011] Preferably, a swing limit plate is provided at the bottom end of each mounting seat, and a swing limit block is provided on both sides of the conveying bucket and below the mounting rotating rod; the swing limit block can rotate around the corresponding mounting rotating rod along with the conveying bucket, and when the side surface of the swing limit block abuts against the swing limit plate, the swing limit plate can limit the swing angle range of the corresponding conveying bucket by limiting the continued rotation of the swing limit block.

[0012] Preferably, the spray cleaning mechanism includes a plurality of cleaning nozzles, which are all arranged above the lifting section and point to the side of the circulating drive chain close to the vibrating drying mechanism; a receiving trough is also provided below the lifting section, and a drainage hole is provided on the surface of each conveying bucket, and the aperture of the drainage hole is smaller than the minimum aperture of the material; the cleaning liquid sprayed by the cleaning nozzle can impact the conveying bucket, driving the conveying bucket to swing around the corresponding mounting rotating rod to mix the cleaning liquid with the material, and the excess cleaning liquid can pass through the drainage hole and fall into the receiving trough for collection.

[0013] Preferably, the vibration drying mechanism includes a collecting bucket and a drying hood, the drying hood is arranged at the top of the collecting bucket, and a plurality of drying fans are arranged at the top of the inner top of the drying hood, and the drying fans can generate an airflow from the drying hood to the direction of the collecting bucket; a screening plate is arranged at the top of the inner top of the collecting bucket, and the screening plate is arranged downwardly and tilted toward the side of the friction cleaning mechanism, a vibration drive motor is arranged at the bottom end of the outer side of the collecting bucket, and a vibration connecting rod is rotatably arranged at the bottom end of the screening plate, and the vibration connecting rod is eccentrically connected between the end away from the screening plate and the output shaft of the vibration drive motor.

[0014] Preferably, the friction cleaning mechanism includes two symmetrically arranged friction rollers, which are respectively arranged on the upper and lower sides of the output end of the screening plate, and a number of electrostatic bristles are arranged on the outside of the two friction rollers; when the two friction rollers rotate, the material output from the screening plate can generate friction with the electrostatic bristles, and impurities on the surface of the material can be adsorbed on the electrostatic bristles.

[0015] Preferably, the grading screening drum includes an outer drum and a central driving shaft, the central driving shaft is fixed to the outer drum through a plurality of driving connecting rod groups, a spiral driving plate is provided between two adjacent driving connecting rod groups, and each of the spiral driving plates is respectively fitted with the outer drum; the outer drum includes a plurality of screening sub-drums, and the grading output mechanism includes a plurality of output guide buckets, each of the output guide buckets is respectively provided at the lower part of each of the screening sub-drums; along the side of the outer drum close to the friction cleaning mechanism toward the side away from the friction cleaning mechanism, the screening particle size of each of the screening sub-drums increases successively, and the particle size of the material output from each of the output guide buckets also increases successively.

[0016] A drum screening method for plastic bottle fragments, using the above-mentioned recovery and screening device, comprises the following steps:

[0017] The crushed plastic bottle fragments are transported into the feed trough together with the label fragments adhering to the surface of the plastic bottle fragments;

[0018] The plastic bottle fragments and label fragments gradually move along the conveying direction of the lifting conveying mechanism, and at the same time, the spray cleaning mechanism can spray the adhesive remover to one side of the lifting conveying mechanism. The plastic bottle fragments and label fragments are mixed with the adhesive remover during the conveying process of the lifting conveying mechanism;

[0019] Under the action of the degumming agent, the plastic bottle fragments and label fragments are separated and dumped from the lifting and conveying mechanism into the vibrating air-drying mechanism;

[0020] The vibration air-drying mechanism dries the plastic bottle fragments and label fragments while conveying them to the side of the friction cleaning mechanism;

[0021] When the plastic bottle fragments and the label fragments pass through the friction cleaning mechanism, friction is generated between them. The plastic bottle fragments pass through the friction cleaning mechanism, and the label fragments are intercepted by the friction cleaning mechanism.

[0022] The plastic bottle fragments enter the grading and screening drum, are sorted by the grading and screening drum, and are graded and output from the grading output mechanism.

[0023] Compared with the prior art, the present invention provides a recycling and screening device and a roller screening method for plastic bottle fragments, which have the following beneficial effects:

[0024] 1. This recovery and screening device, under the action of the lifting and conveying mechanism, the material to be screened is conveyed along the feed trough inside the lifting and conveying mechanism to one side of the vibrating air-drying mechanism, and during the conveying process, the spray cleaning mechanism can spray the cleaning agent to one side of the lifting and conveying mechanism, and the cleaning agent and the material to be screened are mixed 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 fully cleaned, and then the material to be screened can be poured from the lifting and conveying mechanism to the inside of the vibrating air-drying mechanism, and the vibrating air-drying mechanism air-dries the material to be screened while conveying it to one side of the friction cleaning mechanism. When the material to be screened passes through the friction cleaning mechanism, friction can be generated between the material and the friction cleaning mechanism. The material passes through the friction cleaning mechanism, and 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 can avoid the mixing of impurities and screen more effectively. Finally, the material to be screened enters the inside of the grading screening drum, is sorted by the grading screening drum, and is graded and output from the inside of the grading output mechanism.

[0025] 2. This recovery and screening device, through the arrangement of a swing limit plate and a swing limit block, when the swing limit block rotates with the conveying bucket around the corresponding installed rotating rod, when the side of the swing limit block abuts against the swing limit plate, the swing limit plate can limit the continued rotation of the swing limit block, thereby limiting the swing angle range of the corresponding conveying bucket, and then, under the impact force of the cleaning liquid sprayed by the cleaning nozzle, drive the conveying bucket to swing around the corresponding installed rotating rod to mix the cleaning liquid and the material, and the excess cleaning liquid can pass through the drain hole and fall into the receiving tank for collection, and can effectively mix and clean the cleaning liquid and the material, and can also drain the material to a certain extent through the drain hole, and can effectively clean the material before screening, thereby avoiding the influence of impurities adhering to the surface of the material on the screening process.

[0026] 3. This type of recovery and screening device is eccentrically connected between the end of the vibration connecting rod away from the screening plate and the output shaft of the vibration driving motor. Under the drive of the vibration driving motor, the vibration connecting rod drives the screening plate to rotate up and down to generate a certain degree of vibration, which vibrates and separates the materials from each other. Then, under the action of the air drying fan that can generate an airflow from the air drying hood to the collection bucket, the cleaning agent on the surface of the material can be fully dried and separated from the material, thereby avoiding the adhesion of the cleaning agent to the material and avoiding affecting the effectiveness of the screening at the rear end. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is one of the three-dimensional structural schematic diagrams of a recovery and screening device of the present invention;

[0028] Figure 2 This is a second schematic diagram of the three-dimensional structure of a recovery and screening device of the present invention;

[0029] Figure 3 This is a schematic diagram of the three-dimensional structure of a lifting and conveying mechanism, a vibrating air-drying mechanism, and a friction cleaning mechanism of a recovery and screening device of the present invention;

[0030] Figure 4 This is a schematic diagram of the internal structure of a lifting and conveying mechanism, a vibrating air-drying mechanism, and a friction cleaning mechanism of a recovery and screening device of the present invention;

[0031] Figure 5 This is a schematic diagram of the three-dimensional structure of a circulating drive chain and a plurality of conveying buckets of a recovery and screening device of the present invention;

[0032] Figure 6 For the present invention Figure 5 A magnified view of part A;

[0033] Figure 7 For the present invention Figure 5 A magnified view of part B;

[0034] Figure 8 This is a schematic diagram of the three-dimensional structure of a grading screening drum and a grading output mechanism of a recovery and screening device of the present invention.

[0035] In the figure: 1. Feed chute; 2. Lifting conveying mechanism; 21. External bracket; 211. Transverse section; 212. Lifting section; 22. Transverse conveyor belt; 23. Circular drive chain; 231. Mounting seat; 232. Swing limit plate; 24. Conveyor bucket; 241. Mounting rod; 242. Swing limit block; 243. Drain hole; 25. Circular drive mechanism; 251. Circular drive motor; 252. Transverse drive pulley; 253. Transverse tension pulley; 254. Lifting drive sprocket; 2 55. Lifting and tensioning sprocket; 3. Vibration air-drying mechanism; 31. Collecting bucket; 32. Screening plate; 33. Vibration drive motor; 34. Vibration connecting rod; 4. Friction cleaning mechanism; 41. Friction roller; 42. Electrostatic brush; 5. Grading screening drum; 51. External drum; 511. Screening sub-drum; 52. Central drive shaft; 53. Drive connecting rod group; 54. Spiral drive plate; 6. Grading output mechanism; 61. Guide bucket; 7. Spray cleaning mechanism; 71. Cleaning nozzle; 72. Receiving tank. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] As introduced in the background technology, there are deficiencies in the prior art. In order to solve the above technical problems, the present application proposes a recycling and screening device and a roller screening method for plastic bottle fragments.

[0038] Example 1:

[0039] Please refer to Figures 1-8 , a recycling and screening device comprises: a feed trough 1, a lifting and conveying mechanism 2, a vibrating air-drying mechanism 3, a friction cleaning mechanism 4, a grading screening drum 5 and a grading output mechanism 6. The feeding end of the lifting and conveying mechanism 2 extends into the bottom of the feed trough 1, and the top of the lifting and conveying mechanism 2 is provided with a spray cleaning mechanism 7; the discharge end of the lifting and conveying mechanism 2 is arranged above one side of the vibrating air-drying mechanism 3, the friction cleaning mechanism 4 is arranged on the other side of the lifting and conveying mechanism 2, and the grading screening drum 5 is rotatably arranged on the top of the grading output mechanism 6; in the process that 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 the material The cleaning liquid is sprinkled, and the cleaning liquid and the material are mixed during the transportation process of the lifting and conveying mechanism 2; when the material carrying the cleaning liquid moves to the top of the vibrating air-drying mechanism 3, it is poured from the lifting and conveying mechanism 2 to the inside of the vibrating air-drying mechanism 3, and the vibrating air-drying mechanism 3 can air-dry the material while conveying it to the side of the friction cleaning mechanism 4. In the process of the material passing through the friction cleaning mechanism 4, friction can be generated between the material and the friction cleaning mechanism 4 to remove adhered impurities; the material after impurities are removed can be conveyed to the end away from the friction cleaning mechanism 4 inside the grading screening drum 5, and in the process of transportation, it is sorted by the grading screening drum 5 and output from the grading output mechanism 6 in a graded manner.

[0040] When in use, the material to be screened is first conveyed into the feed trough 1 (in specific use, a baffle is provided inside the feed trough 1 and above the lifting and conveying mechanism 2, which can limit the amount of material conveyed from the lifting and conveying mechanism 2 and reduce the cleaning and screening pressure at the rear end). Under the action of the lifting and conveying mechanism 2, the material to be screened is conveyed inside the lifting and conveying mechanism 2 along the feed trough 1 to the side of the vibrating air-drying mechanism 3, and during the conveying process, the spray cleaning mechanism 7 can spray a cleaning agent to one side of the lifting and conveying mechanism 2, and the cleaning agent and the material to be screened are mixed during the conveying process of the lifting and conveying mechanism 2 to clean the material to be screened, so that the material to be screened can be After being fully cleaned, the material to be screened can be poured from the lifting and conveying mechanism 2 into the vibrating air-drying mechanism 3. The vibrating air-drying mechanism 3 air-dries the material to be screened and conveys it to the side of the friction cleaning mechanism 4. When the material to be screened passes through the friction cleaning mechanism 4, friction can be generated between the material and the friction cleaning mechanism 4. The material passes through the friction cleaning mechanism 4, and the impurities adhering to the outside of the material are intercepted by the friction cleaning mechanism 4, thereby effectively ensuring the purity of the material before screening, and avoiding the mixing of impurities and screening more effectively. Finally, the material to be screened enters the grading screening drum 5, and is sorted by the grading screening drum 5 and output from the grading output mechanism 6.

[0041] Example 2:

[0042] Please refer to Figure 1-Figure 7 The difference from the above embodiment is that the lifting and conveying mechanism 2 includes an external bracket 21, the external bracket 21 includes a transverse section 211 and a lifting section 212, a transverse conveyor belt 22 is arranged inside the transverse section 211, and a circulating drive chain 23 is arranged inside the lifting section 212, and the circulating drive chain 23 is mounted with a plurality of conveying buckets 24; the end of the transverse section 211 close to the lifting section 212 is arranged above the lifting section 212, and the transverse conveyor belt 22 can convey the material along the direction of the transverse section 211 to the side close to 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, and when the conveying bucket 24 passes below the end of the transverse section 211 close to the lifting section 212, the material can fall from the transverse conveyor belt 22 into the conveying bucket 24.

[0043] The lifting and conveying mechanism 2 also includes a circulating drive mechanism 25, which includes a circulating drive motor 251, a transverse drive pulley 252, several transverse tensioning pulleys 253, a lifting drive sprocket 254 and several lifting tensioning sprockets 255; the output shaft of the circulating drive motor 251 transmits power to 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 tensioning pulleys 253, and the circulating drive chain 23 is tensioned on the outside of the lifting drive sprocket 254 and several lifting tensioning 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.

[0044] Therefore, when in use, the output shaft of the circulating drive motor 251 outputs power to the transverse driving pulley 252 and the lifting driving sprocket 254 at the same time, so that the transverse conveyor belt 22 tensioned on the outside of the transverse driving pulley 252 and several transverse tensioning pulleys 253, and the circulating drive chain 23 tensioned on the outside of the lifting driving sprocket 254 and several lifting tensioning sprockets 255 can rotate synchronously, so that while the transverse conveyor belt 22 continuously conveys the materials to be screened, each conveying bucket 24 can be continuously driven to circulate under the drive of the circulating drive chain 23, and then the conveying bucket 24 passes through the transverse When section 211 is close to the bottom of one end of the lifting section 212, the material can fall from the transverse conveyor belt 22 into the conveying bucket 24 (in actual use, the differential speed between the transverse drive pulley 252 and the lifting drive sprocket 254, and the setting of a collecting bucket below the intersection of the transverse conveyor belt 22 and the circulating drive chain 23 can be used to collect some of the lost materials and re-input them into the feed trough 1, thereby avoiding the loss of some materials output from the transverse conveyor belt 22 due to the setting gaps of each conveying bucket 24), so that the materials to be screened can be transported from each conveying bucket 24 to the side of the vibration drying mechanism 3 at a certain rate.

[0045] Several 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 consistent with the number of conveying buckets 24; mounting rotating rods 241 are provided on both sides of each conveying bucket 24, and the mounting rotating rods 241 are rotatably connected to the corresponding mounting seats 231 through bearings, and the conveying bucket 24 can swing around the corresponding mounting rotating rods 241.

[0046] A swing limit plate 232 is provided at the bottom end of each mounting seat 231, and a swing limit block 242 is provided on both sides of the conveying bucket 24 and below the mounting rotating rod 241; the swing limit block 242 can rotate around the corresponding mounting rotating rod 241 along with the conveying bucket 24, and when the side of the swing limit block 242 abuts against the swing limit plate 232, the swing limit plate 232 can limit the swing angle range of the corresponding conveying bucket 24 by limiting the continued rotation of the swing limit block 242.

[0047] The spray cleaning mechanism 7 includes several cleaning nozzles 71, which are all arranged above the lifting section 212, and the cleaning nozzles 71 are all directed to the side of the circulating drive chain 23 close to the vibration drying mechanism 3; a receiving groove 72 is also provided below the lifting section 212, and each conveying bucket 24 is provided with a drainage hole 243 on the surface, and the aperture of the drainage hole 243 is smaller than the minimum aperture of the material; the cleaning liquid sprayed by the cleaning nozzle 71 can impact the conveying bucket 24, driving the conveying bucket 24 to swing around the corresponding installation rotating rod 241 to mix the cleaning liquid and the material, and the excess cleaning liquid can pass through the drainage hole 243 and fall into the receiving groove 72 for collection.

[0048] During use, through the setting of the swing limit plate 232 and the swing limit block 242, the swing limit block 242 rotates with the conveying bucket 24 around the corresponding installation rotating rod 241. When the side of the swing limit block 242 abuts against the swing limit plate 232, the swing limit plate 232 can limit the continued rotation of the swing limit block 242 to limit the swing angle range of the corresponding conveying bucket 24, and 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 installation rotating rod 241 to mix the cleaning liquid and the material. The excess cleaning liquid can pass through the drain hole 243 and fall into the inside of the receiving tank 72 for collection, and can effectively mix and clean the cleaning liquid and the material, and can also drain the material to a certain extent through the drain hole 243, and can effectively clean the material before screening, avoiding the influence of impurities adhering to the surface of the material on the screening process.

[0049] Example 3:

[0050] Please refer to Figure 1-Figure 4 、 Figure 8The difference from the above embodiment is that the vibration drying mechanism 3 includes a collecting bucket 31 and a drying hood. The drying hood is arranged at the top of the collecting bucket 31, and a plurality of drying fans are arranged at the top of the drying hood. The drying fans can generate an airflow from the drying hood to the collecting bucket 31; a screening plate 32 is arranged at the top of the collecting bucket 31, and the screening plate 32 is arranged downwardly toward the side of the friction cleaning mechanism 4. A vibration driving motor 33 is arranged at the bottom end of the outer side of the collecting bucket 31, and a vibration connecting rod 34 is rotatably arranged at the bottom end of the screening plate 32. The end of the vibration connecting rod 34 away from the screening plate 32 is eccentrically connected to the output shaft of the vibration driving motor 33.

[0051] During use, the vibration connecting rod 34 is eccentrically connected to the output shaft of the vibration driving motor 33 at one end away from the screening plate 32, so that under the drive of the vibration driving motor 33, the screening plate 32 is driven by the vibration connecting rod 34 to rotate up and down, thereby generating a certain degree of vibration, thereby vibrating and separating the materials from each other, and then, under the action of the air drying fan that can generate an airflow from the air drying hood to the collecting bucket 31, the cleaning agent on the surface of the material can be fully dried and separated from the material, thereby avoiding the adhesion of the cleaning agent to the material and avoiding affecting the effectiveness of the screening at the rear end.

[0052] The friction cleaning mechanism 4 includes two symmetrically arranged friction rollers 41, and the two friction rollers 41 are respectively arranged on the upper and lower sides of the output end of the screening plate 32, and a number of electrostatic bristles 42 are arranged on the outside of the two friction rollers 41; while the two friction rollers 41 rotate, the material output from the screening plate 32 can generate friction with the electrostatic bristles 42, and the impurities on the surface of the material are adsorbed on the electrostatic bristles 42, so that under the action of the electrostatic bristles 42, the impurities on the surface of the material can be adsorbed on the outside of the electrostatic bristles 42 through static electricity (generated by the mutual friction of the electrostatic bristles 42), so as to avoid the impurities on the surface of the material affecting the purity of the material after screening, and after running for a period of time, the electrostatic bristles 42 can be cleaned and the adhesion of the electrostatic bristles 42 can be restored, thereby effectively performing the impurity removal function of the friction cleaning mechanism 4.

[0053] The grading and screening drum 5 includes an outer drum 51 and a central driving shaft 52. The central driving shaft 52 is fixed to the outer drum 51 through a plurality of driving connecting rod groups 53. A spiral driving plate 54 is provided between two adjacent driving connecting rod groups 53. Each spiral driving plate 54 is respectively fitted with the outer drum 51; the outer drum 51 includes a plurality of screening sub-drums 511, and the grading output mechanism 6 includes a plurality of output guide buckets 61. Each output guide bucket 61 is respectively provided at the lower part of each screening sub-drum 511; along the side of the outer drum 51 close to the friction cleaning mechanism 4 toward the side away from the friction cleaning mechanism 4, the screening particle size of each screening sub-drum 511 increases successively, and the particle size of the material output from each output guide bucket 61 also increases successively.

[0054] Therefore, during specific use, the central drive shaft 52 is fixed to the outer drum 51 through several drive connecting rod groups 53, so that the entire outer drum 51 can rotate, and through the setting of each spiral drive plate 54, the material entering the outer drum 51 can be driven along the spiral drive plate 54, preventing the material in the prior art from freely falling due to the inclined screening drum 5, and unable to accept the effective screening time and resulting in incomplete screening, and moving from the side close to the friction cleaning mechanism 4 to the side away from the friction cleaning mechanism 4, thereby separating from the outer drum 51 under the screening of each screening sub-cylinder 511 and entering the interior of each output guide bucket 61 for screening and separation.

[0055] Example 4:

[0056] A drum screening method for plastic bottle fragments, using a recovery and screening device as described in any one of Examples 1 to 3, comprises the following steps:

[0057] The crushed plastic bottle fragments are transported into the feed trough 1 together with the label fragments adhering to the surface of the plastic bottle fragments;

[0058] The plastic bottle fragments and label fragments gradually move along the conveying direction of the lifting and conveying mechanism 2, and at the same time, the spray cleaning mechanism 7 can spray the adhesive remover to one side of the lifting and conveying mechanism 2. The plastic bottle fragments and label fragments are mixed with the adhesive remover during the conveying process of the lifting and conveying mechanism 2;

[0059] Under the action of the degumming agent, the plastic bottle fragments and the label fragments are separated and dumped from the lifting and conveying mechanism 2 into the vibrating air-drying mechanism 3;

[0060] The vibration air-drying mechanism 3 air-dries the plastic bottle fragments and label fragments while conveying them to the side of the friction cleaning mechanism 4;

[0061] When the plastic bottle fragments and the label fragments pass through the friction cleaning mechanism 4, friction is generated between the plastic bottle fragments and 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.

[0062] The plastic bottle fragments enter the interior of the grading and screening drum 5 , are sorted by the grading and screening drum 5 , and are graded and output from the interior of the grading output mechanism 6 .

[0063] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A recovery and screening device, characterized in that: include: A feed trough, a lifting and conveying mechanism, a vibrating air-drying mechanism, a friction cleaning mechanism, a grading screening drum, and a grading output mechanism. The feed end of the lifting and conveying mechanism extends into the bottom of the feed trough, and a spray cleaning mechanism is provided on the top of the lifting and conveying mechanism. The discharge end of the lifting and conveying mechanism is arranged above one side of the vibrating air-drying mechanism, the friction cleaning mechanism is arranged on the other side of the lifting and conveying mechanism, and the grading screening drum is rotatably arranged on the top of the grading output mechanism; During the process of the crushed material to be screened gradually moving along the conveying direction of the lifting conveying mechanism, the spray cleaning mechanism can spray cleaning liquid onto the material, and the cleaning liquid and the material are mixed during the conveying process of the lifting conveying mechanism; When the material carrying the cleaning liquid moves to the top of the vibration air-drying mechanism, it is poured from the lifting and conveying mechanism into the interior of the vibration air-drying mechanism. The vibration air-drying mechanism can air-dry the material while conveying it to the side of the friction cleaning mechanism. When the material passes through the friction cleaning mechanism, friction can be generated between the material and the friction cleaning mechanism to remove adhering impurities. The material after impurities are removed can be transported inside the grading screening drum to the end away from the friction cleaning mechanism, and during the transportation process, it is sorted by the grading screening drum and output from the grading output mechanism in a graded manner.

2. A recovery and screening device according to claim 1, characterized in that: The lifting and conveying mechanism includes an external bracket, the external bracket includes a transverse section and a lifting section, a transverse conveyor belt is provided inside the transverse section, a circulating drive chain is provided inside the lifting section, and a plurality of conveying buckets are mounted on the circulating drive chain; One end of the transverse section close to the lifting section is arranged above the lifting section, and the transverse conveyor belt can convey the material along the direction of the transverse section to the side close to the lifting section; The circulating drive chain can circulate each conveying bucket along the direction of the lifting section, and when the conveying bucket passes under one end of the transverse section close to the lifting section, the material can fall from the transverse conveyor belt into the conveying bucket.

3. A recovery and screening device according to claim 2, characterized in that: The lifting and conveying mechanism further includes a circulation drive mechanism, which includes a circulation drive motor, a transverse driving pulley, a plurality of transverse tensioning pulleys, a lifting drive sprocket and a plurality of lifting tensioning sprockets; The output shaft of the circulation drive motor transmits power to the transverse drive pulley and the lifting drive sprocket respectively, the transverse conveyor belt is tensioned on the outside of the transverse drive pulley and several transverse tensioning pulleys, and the circulation drive chain is tensioned on the outside of the lifting drive sprocket and several lifting tensioning sprockets. The circulation drive motor can drive the transverse conveyor belt and the circulation drive chain to rotate synchronously through the transverse drive pulley and the lifting drive sprocket.

4. A recovery and screening device according to claim 3, characterized in that: A plurality of mounting seats are provided on the outer side of the circulating drive chain, and the number of the mounting seats of each circulating drive chain is consistent with the number of the conveying buckets; Each conveying bucket is provided with a mounting rotating rod on both sides. The mounting rotating rods are rotatably connected to the corresponding mounting seats through bearings, and the conveying bucket can swing around the corresponding mounting rotating rod.

5. A recovery and screening device according to claim 4, characterized in that: A swing limit plate is provided at the bottom end of each mounting seat, and swing limit blocks are provided on both sides of the conveying bucket and below the mounting rotating rod; The swing limit block can rotate with the conveying bucket around the corresponding mounting rotating rod. When the side surface of the swing limit block abuts against the swing limit plate, the swing limit plate can limit the swing angle range of the corresponding conveying bucket by limiting the continued rotation of the swing limit block.

6. A recovery and screening device according to claim 5, characterized in that: The spray cleaning mechanism includes a plurality of cleaning nozzles, each of which is arranged above the lifting section and points to the side of the circulating drive chain close to the vibration air-drying mechanism; A receiving trough is further provided below the lifting section, and a drainage hole is provided on the surface of each conveying bucket, the aperture of each drainage hole being smaller than the minimum aperture of the material; The cleaning liquid sprayed from the cleaning nozzle can impact the conveying bucket, driving the conveying bucket to swing around the corresponding mounting rotating rod to mix the cleaning liquid with the material, and the excess cleaning liquid can pass through the drain hole and fall into the receiving tank for collection.

7. A recovery and screening device according to claim 6, characterized in that: The vibration air-drying mechanism includes a collection hopper and an air-drying hood. The air-drying hood is arranged at the top of the collection hopper. A plurality of air-drying fans are arranged at the top of the interior of the air-drying hood. The air-drying fans can generate an airflow from the air-drying hood to the collection hopper. A screening plate is provided at the top of the inner part of the collecting bucket, and the screening plate is tilted downward toward the side of the friction cleaning mechanism. A vibration drive motor is provided at the bottom end of the outer side of the collecting bucket, and a vibration connecting rod is rotatably provided at the bottom end of the screening plate. The end of the vibration connecting rod away from the screening plate is eccentrically connected to the output shaft of the vibration drive motor.

8. A recovery and screening device according to claim 7, characterized in that: The friction cleaning mechanism includes two symmetrically arranged friction rollers, which are respectively arranged on the upper and lower sides of the output end of the screening plate, and a plurality of electrostatic bristles are arranged on the outer sides of the two friction rollers; When the two friction rollers rotate, the material output from the screening plate can generate friction with the electrostatic bristles, so that impurities on the surface of the material are adsorbed on the electrostatic bristles.

9. The recovery and screening device according to claim 1, characterized in that: The grading and screening drum includes an outer drum and a central drive shaft. The central drive shaft is fixed to the outer drum through a plurality of drive connecting rod groups. A spiral drive plate is provided between two adjacent drive connecting rod groups. Each of the spiral drive plates is respectively fitted between the outer drum. The outer drum includes a plurality of screening cylinders, and the grading output mechanism includes a plurality of output guide buckets, each of which is respectively arranged at the bottom of each screening cylinder; Along the side of the outer drum close to the friction cleaning mechanism toward the side away 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 bucket also increases sequentially.

10. A drum screening method for plastic bottle fragments, characterized in that: A recovery and screening device according to any one of claims 1 to 9 is used, comprising the following steps: The crushed plastic bottle fragments are transported into the feed trough together with the label fragments adhering to the surface of the plastic bottle fragments; The plastic bottle fragments and label fragments gradually move along the conveying direction of the lifting conveying mechanism, and at the same time, the spray cleaning mechanism can spray the adhesive remover to one side of the lifting conveying mechanism. The plastic bottle fragments and label fragments are mixed with the adhesive remover during the conveying process of the lifting conveying mechanism; Under the action of the degumming agent, the plastic bottle fragments and label fragments are separated and dumped from the lifting and conveying mechanism into the vibrating air-drying mechanism; The vibration air-drying mechanism dries the plastic bottle fragments and label fragments while conveying them to the side of the friction cleaning mechanism; When the plastic bottle fragments and the label fragments pass through the friction cleaning mechanism, friction is generated between them. The plastic bottle fragments pass through the friction cleaning mechanism, and the label fragments are intercepted by the friction cleaning mechanism. The plastic bottle fragments enter the grading and screening drum, are sorted by the grading and screening drum, and are graded and output from the grading output mechanism.

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