Plastic particle processing and recycling device and processing method

Abstract

The invention discloses a plastic particle processing and recycling device and a processing method, and particularly relates to plastic recycling equipment, the plastic particle processing and recycling device comprises a centrifugal dewatering bin and a sequencing bin, the sequencing bin is fixedly communicated with a discharging pipe, and the discharging pipe is provided with a material distributing groove; plastic sheets enter the discharging pipe from the sorting bin after being dewatered in the centrifugal dewatering bin and turn over along the discharging pipe so as to enter or cross the material distributing groove. When dewatered plastic sheets with different sizes are output through the discharging pipe, the plastic sheets can be overturned in the discharging pipe, at the moment, the plastic sheets with different sizes can meet different resistances during overturning flying, the plastic sheets with large areas can fall down and fall off from the distributing groove, and the plastic sheets with small areas can continuously fly to be output from the discharging pipe. And the temperature of the separated plastic sheets is easier to control during pressurized granulation, and the conditions of bubbles, distortion deformation and overlarge shape change are not easy to occur.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic recycling, and in particular to a plastic particle processing and recycling device and a processing method. Background Art

[0002] Plastic recycling is the process of processing waste plastics through multiple steps to make plastic particles that can be used directly, thus achieving the goal of turning waste into treasure.

[0003] According to patent number CN108943489A, published (announcement) date: 2018-12-07, a method for recycling, processing and reusing waste plastics is disclosed, including the following steps: a: waste plastics collected from the waste plastic source are transported to a waste recycling device, and the waste plastics are pre-treated by picking and dust removal; b: the pre-treated waste is melted by a furnace and extruded into strips by an extrusion device; c: the extruded plastic strips are dried by a centrifugal dehydration device, and the dried plastics are transported to a cutting and molding device; d: the cutting and molding device cuts the strip plastics into granules and collects them in a storage tank; e: the finished products in the storage tank are packaged. The present invention adopts a PLC control system for centralized monitoring, management and automatic program control, realizes intelligent cleaning of the production device, ensures the processing quality of the product, and realizes resource utilization of waste plastics, which not only realizes the recycling and reuse of resources for the waste generated by the plastic factory, but also saves production costs for the plastic factory and improves economic benefits.

[0004] In the prior art including the above-mentioned patent, plastics are selected after recycling to separate plastics of different properties such as PP and Pet. After recycling, they are crushed and cleaned, and then dehydrated by a centrifugal fan and put into a screw extruder to make plastic particles. However, after the plastics are crushed, they become plastic pieces of different sizes. When oversized and undersized plastic pieces enter the screw extruder together, the large plastic pieces are prone to large changes in shape due to uneven heat distribution, and when the temperature is increased, the undersized plastic pieces are prone to bubbles and distortion. Summary of the invention

[0005] The purpose of the present invention is to provide a plastic particle processing and recovery device and a processing method, aiming to solve the above-mentioned problems.

[0006] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: a plastic particle processing and recovery device, comprising a centrifugal dehydration bin and a sorting bin, the sorting bin is fixedly connected to a discharge pipe, and the discharge pipe is provided with a material distribution trough; Wherein: after being dehydrated in the centrifugal dehydration bin, the plastic sheets enter the discharge pipe from the sorting bin and turn over along the discharge pipe to enter or pass over the distribution trough.

[0007] Preferably, a guiding slope is provided on the bottom surface of the discharge pipe, a limiting protrusion is provided at the end of the guiding slope, and the plastic sheet flips along with the limiting protrusion.

[0008] Preferably, the centrifugal dehydration bin comprises a water screening hood and a water collecting hood, the water screening hood is fixedly connected with an air and material pipe for feeding, and the plastic sheet moves along the inner wall of the water screening hood with the air flow and turns over at a predetermined position.

[0009] Preferably, limiting slopes are staggeredly arranged on the water screening hood, with the highest point of the limiting slopes facing the air material pipe, and a semi-annular wind hood for continuous air discharge is arranged in the water screening hood.

[0010] Preferably, the sorting bin is provided with a material receiving pipe extending into the water screening cover, and the water screening cover is provided with a plurality of limiting convex balls located on the top of the material receiving pipe, and the plastic sheets move or fall along the limiting convex balls.

[0011] Preferably, the sorting bin comprises a circulation hood and a sorting pipe connected to the discharge pipe, a multi-directional combined air outlet pipe is arranged in the circulation hood, and the sorting pipe restricts the plastic sheets from entering the discharge pipe in sequence.

[0012] Preferably, a paddle is rotatably provided at the feed inlet of the sorting tube, and a lifting slope is provided at one end of the paddle. The plastic sheet pushes against the paddle, driving the lifting slope to extend into the circulation cover, so that subsequent plastic sheets flip over the sorting tube.

[0013] Preferably, a connecting air duct is provided between the sorting bin and the discharge pipe, and air outlet from the connecting air duct restricts the plastic sheet from sticking to the bottom of the discharge pipe.

[0014] Preferably, the semi-annular wind hood and the water screening hood are provided with an inclined plane, and a partition plate is provided inside the semi-annular wind hood, and the partition plate guides part of the airflow to be transported to the inclined plane.

[0015] A plastic particle processing method, including the plastic particle processing and recycling device in the above scheme, specifically comprises the following steps: S01, crushing the waste plastic products through a crusher to obtain plastic pieces of different sizes; S02, putting the plastic sheet into a stirring tank for pre-cleaning, and then putting it into an ultrasonic tank for fine cleaning; S03, putting the cleaned plastic sheets into a centrifugal dehydration bin for dehydration, and the dehydrated plastic sheets are transported to a discharge pipe through a sorting bin; S04. The plastic flakes are screened through a discharge pipe to obtain two types of plastic flakes, which are then extruded through plastic screw extruders at different temperatures to form plastic granules.

[0016] In the above technical scheme, a plastic particle processing and recovery device and processing method provided by the present invention have the following beneficial effects: when the dehydrated plastic sheets of different sizes are output through the discharge pipe, the plastic sheets will flip over in the discharge pipe. At this time, the plastic sheets of different sizes will encounter different resistances when flipping and flying, and the large-area plastic sheets will fall and fall from the dividing trough, while the small-area plastic sheets will continue to fly and be output from the discharge pipe. The separated plastic sheets are easier to control the temperature during pressurized granulation, and are less likely to have bubbles, distortion, and excessive shape changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 An overall schematic diagram provided for an embodiment of the present invention; Figure 2 A schematic diagram of a centrifugal dehydration bin explosion provided in an embodiment of the present invention; Figure 3 for Figure 2 The enlarged schematic diagram at A in the middle; Figure 4 A schematic diagram of the structure of a water screening hood and a material receiving pipe provided in an embodiment of the present invention; Figure 5 A schematic diagram of a sorting bin explosion provided in an embodiment of the present invention; Figure 6 A schematic cross-sectional view of a centrifugal dehydration bin provided in an embodiment of the present invention; Figure 7 A schematic diagram of the structure of a water screening hood and a circulation hood provided in an embodiment of the present invention; Figure 8 A schematic cross-sectional view of a sorting bin provided in an embodiment of the present invention; Fig. 9 for Figure 8 The enlarged schematic diagram of point B in the middle; Fig.10 for Figure 8 The enlarged schematic diagram at C in the middle; Fig.11 An overall cross-sectional schematic diagram provided for an embodiment of the present invention.

[0019] Description of reference numerals: 1. Centrifugal dehydration bin; 10. First cover plate; 11. Water screen cover; 110. Feed opening; 111. Limiting slope; 112. Water trough; 113. Inclined plane; 114. Rounded corner; 115. Limiting convex ball; 12. Water collecting cover; 121. Collecting ring; 13. Semi-circular wind cover; 131. Inclined air outlet; 132. Partition plate; 14. First annular guide cover; 16. Air and material pipe; 161. Air inlet; 162. Feed 1. opening; 2. sorting bin; 20. second cover plate; 21. circulation cover; 211. vent; 22. receiving pipe; 23. second annular guide cover; 24. sorting pipe; 241. rotating shaft; 242. lifting slope; 243. dial plate; 25. multi-directional combined air outlet; 251. arc-shaped air outlet; 3. discharge pipe; 31. connecting air duct; 311. application air outlet; 32. guiding slope; 321. limiting protrusion; 33. material distribution trough. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0021] Embodiment 1 like Figure 1-11 As shown, a plastic particle processing and recycling device comprises a centrifugal dehydration chamber 1 and a sorting chamber 2, the sorting chamber 2 is fixedly connected with a discharge pipe 3, and the discharge pipe 3 is provided with a distribution trough 33; The plastic sheets are dehydrated in the centrifugal dehydration bin 1 and then enter the discharge pipe 3 from the sorting bin 2 , and turn over along the discharge pipe 3 to enter or pass over the dividing trough 33 .

[0022] Specifically, the centrifugal dehydration bin 1 and the sorting bin 2 are connected, and the discharge pipe 3 is a long channel. When the plastic sheets are ejected from the discharge pipe 3 with the airflow, the plastic sheets will break away from the bottom of the discharge pipe 3 and move in the air, and gradually fall down with the dissipation of the pushing force of the airflow and the air resistance, so as to screen the plastic sheets with different areas through the air resistance.

[0023] Furthermore, the discharge pipe 3 is a long pipe, and a plurality of small air outlets may be provided on the side wall of the discharge pipe 3 to share the airflow output from the sorting bin 2 and reduce the pushing force of the airflow on the plastic sheets.

[0024] In the above technical scheme, when the dehydrated plastic sheets of different sizes are output through the discharge pipe 3, the plastic sheets will flip over in the discharge pipe 3. At this time, the plastic sheets of different sizes will encounter different resistances when flipping and flying, and the large-area plastic sheets will fall first due to the large resistance and fall from the dividing trough 33, while the small-area plastic sheets will continue to fly and be output from the discharge pipe 3 to separate the large-area plastic sheets and the small plastic sheets. The separated plastic sheets are melted in batches during pressurized granulation, which makes it easier to control the temperature and is less likely to cause bubbles, distortion, and excessive shape changes.

[0025] As an embodiment provided by the present invention, a guiding slope 32 is provided on the bottom surface of the discharge pipe 3 , a limiting protrusion 321 is provided at the end of the guiding slope 32 , and the plastic sheet turns over along with the limiting protrusion 321 .

[0026] Specifically, the angle of the guide slope 32 is 3°~5°, the low position of the guide slope 32 faces the sorting bin 2, and the end (i.e., the high position) of the guide slope 32 is provided with a limiting protrusion 321. When the plastic sheet moves along the bottom of the discharge pipe 3 with the airflow, it will slide along the low position of the guide slope 32 to lift one end of the plastic sheet. After the lifted plastic sheet continues to move against the limiting protrusion 321, the other end will be tilted due to inertia and pushed by the airflow to flip over and detach from the guide slope 32, thereby realizing the flipping of the plastic sheet in the discharge pipe 3, thereby screening the plastic sheet through resistance.

[0027] As an embodiment provided by the present invention, the centrifugal dehydration bin 1 includes a water screening cover 11 and a water collecting cover 12. The water screening cover 11 is fixedly connected with an air feed pipe 16 for feeding. The plastic sheet moves along the inner wall of the water screening cover 11 with the air flow and flips at a predetermined position.

[0028] Specifically, the water screening hood 11 is provided with water troughs 112 in a circumferential array, and the water troughs 112 are used for air flow to carry water droplets on the plastic sheets and separate them, so that the water droplets enter the collecting ring 121 on the water collecting hood 12 and are collected uniformly. The water screening hood 11 is provided with a feed opening 110, and an air material pipe 16 is arranged in the feed opening 110. The air material pipe 16 is provided with an air inlet 161 and a feed port 162. The air inlet 161 is connected to the fan, so that the plastic sheets in the feed port 162 are transported into the water screening hood 11 through the air flow, and the plastic sheets will move along the inner wall of the water screening hood 11 and turn over at a predetermined position, thereby realizing turning over, accelerating the separation of water on the plastic sheets, accelerating the dehydration step, and increasing the dehydration efficiency of the centrifugal dehydration bin 1. The water screening hood 11 is symmetrically provided with a first annular guide hood 14, and the first annular guide hood 14 is used to limit the airflow and keep the plastic sheets attached to the inner wall of the water screening hood 11.

[0029] Furthermore, limiting slopes 111 are staggeredly arranged on the water screening hood 11 (the predetermined position is the area where the limiting slopes 111 are located), and the limiting slopes 111 are arranged in a linear array along the central axis direction of the water screening hood 11, and the number of groups of the linear array is not less than two groups, and the two groups of limiting slopes 111 are staggered. Therefore, when the plastic sheet is pushed to the area where the limiting slopes 111 are located by the air flow, most of the plastic sheets are restricted by the limiting slopes 111, and the high point of the limiting slope 111 is toward the air material pipe 16 (that is, the high point is toward the running direction of the plastic sheet), so that one end of the plastic sheet will flip over with the limiting slope 111 as the fulcrum, thereby realizing the turning over of the plastic sheet.

[0030] A semi-annular wind hood 13 with continuous air discharge is arranged in the water screening hood 11. Inclined air outlets 131 are arranged in a circular array on the semi-annular wind hood 13. The air discharge direction of the inclined air outlets 131 is the same as the moving direction of the plastic sheet. The semi-annular wind hood 13 is connected to another fan to compensate for the airflow running away along the water trough 112 and limit the continuous movement of the plastic sheet along the inner wall of the water screening hood 11.

[0031] Furthermore, a first cover plate 10 is provided on the water screening cover 11 to provide sealing and covering to reduce airflow escape.

[0032] As an embodiment provided by the present invention, a material receiving pipe 22 extending into the water screening cover 11 is provided on the sorting bin 2 , and a plurality of limiting convex balls 115 are provided on the water screening cover 11 at the top of the material receiving pipe 22 , and the plastic sheets move or fall along the limiting convex balls 115 .

[0033] Specifically, a partition is provided between the sorting bin 2 and the water screening hood 11, and the material receiving pipe 22 is provided on the partition. An inclined plane 113 is provided on the water screening hood 11, and a rounded corner 114 is provided between the inclined plane 113 and the inner wall of the water screening hood 11. A plurality of limiting convex balls 115 are provided on the inclined plane 113. When the plastic sheet moves along the rounded corner 114 to the inclined plane 113 with the airflow, it will move on the inclined plane 113 due to water droplets and friction. At this time, when encountering the limiting convex ball 115, the plastic sheet will bypass the limiting convex ball 115 while maintaining the state of being in contact with the inclined plane 113, thereby continuing to move along the water screening hood 11. When the water droplets on the plastic sheet have been separated by centrifugation, the plastic sheet is pushed by the airflow and still moves on the inclined plane 113, but will be bounced off and fall when encountering the limiting convex ball 115, thereby falling into the material receiving pipe 22 and entering the sorting bin 2 for subsequent sorting.

[0034] As an embodiment provided by the present invention, the sorting bin 2 includes a circulation cover 21 and a sorting pipe 24 connected to the discharge pipe 3. A multi-directional combined air outlet pipe 25 is arranged in the circulation cover 21. The sorting pipe 24 restricts the plastic sheets from entering the discharge pipe 3 in sequence.

[0035] Specifically, a second annular guide cover 23 is symmetrically arranged on the circulation cover 21, and arc-shaped air outlets 251 are arranged in a circular array on the multi-directional combined air outlet duct 25. The multi-directional combined air outlet duct 25 is connected to the fan, driving the airflow to be discharged along the arc-shaped air outlet 251 and restricted by the second annular guide cover 23, so that the airflow circulates along the inner wall of the circulation cover 21. When the plastic sheet falls from the inclined plane 113 to the receiving pipe 22, it is discharged along the receiving pipe 22 to the circulation cover 21 and circulates with the airflow to enter the sorting pipe 24, and then enters the discharge pipe 3 for subsequent screening operations.

[0036] Furthermore, a second cover plate 20 for sealing is provided on the circulation cover 21 .

[0037] Furthermore, a rotating shaft 241 is provided on the dial plate 243, and a dial plate 243 is provided on the feed end of the sorting tube 24 for rotation. Fig.10 As shown, a lifting slope 242 is provided at one end of the paddle plate 243, and the lifting slope 242 faces the entrance of the sorting tube 24. When the plastic sheet is pushed into the sorting tube 24 by the airflow, the plastic sheet pushes the paddle plate 243 to flip over, thereby prying the lifting slope 242 to extend into the circulation cover 21, so that the subsequent plastic sheets will be lifted and flipped along the lifting slope 242 when pushed by the airflow, thereby crossing the sorting tube 24 and continuing to circulate along the sorting tube 24.

[0038] A silicone elastic sheet is arranged between the paddle 243 and the sorting tube 24 to quickly rebound the plastic sheet after it passes through the paddle 243 to allow subsequent plastic sheets to pass through, thereby limiting the spacing between the plastic sheets output by the sorting tube 24 and avoiding collision between adjacent plastic sheets when they are too close to each other, thereby affecting the screening in the discharge tube 3.

[0039] As an embodiment provided by the present invention, a connecting air duct 31 is provided between the sorting bin 2 and the discharge pipe 3 , and an air outlet limiting plastic sheet of the connecting air duct 31 is attached to the bottom of the discharge pipe 3 .

[0040] Specifically, a vent 211 is provided on the circulation hood 21 on the sorting bin 2, and the connecting air duct 31 is connected to the connection between the discharge pipe 3 and the sorting pipe 24. A plurality of application air ports 311 are provided on the connecting air duct 31. When the airflow in the circulation hood 21 circulates, it will enter the connecting air duct 31 along the vent 211 and be ejected from the application air ports 311, thereby pushing the plastic sheet to fit the bottom of the discharge pipe 3, ensuring that the plastic sheet will not detach from the bottom prematurely, thereby increasing the screening accuracy.

[0041] As the optimal embodiment provided by the present invention, the semi-annular wind hood 13 and the water screening hood 11 are provided with an inclined plane 113 , and a partition plate 132 is provided inside the semi-annular wind hood 13 , and the partition plate 132 guides part of the airflow to be transported to the inclined plane 113 .

[0042] Specifically, Figure 6 As shown, an air duct is opened in the semi-annular wind cover 13, and the air duct covers a plurality of inclined air outlets 131. A partition plate 132 is arranged in the air duct and separates part of the air duct to supply air to the inclined plane 113 separately, thereby specifically enhancing the airflow rushing toward the inclined plane 113 and maintaining the movement of the plastic sheet along the inclined plane 113.

[0043] First, the cleaned plastic sheet is put into the feed port 162 and the air flow is driven through the air inlet 161 to carry the plastic sheet in the feed port 162 into the water screening cover 11, and the plastic sheet will move along the inner wall of the water screening cover 11. When the semi-annular wind cover 13 is started to drive the plastic sheet to the area where the limiting slope 111 is located with the air flow, one end of the plastic sheet will turn over with the limiting slope 111 as a fulcrum to realize the turning over of the plastic sheet, and the turning over is pulled to fit the water screening cover 11 again, and move to the inclined plane 113 along the fillet 114 with the air flow. When there are still water droplets on the plastic sheet, it will move on the inclined plane 113 due to the water droplets and friction. At this time, when encountering the limiting convex ball 115, the plastic sheet will bypass the limiting convex ball 115 while keeping fitting the inclined plane 113, thereby continuing to be dehydrated along the water screening cover 11, and when the water droplets on the plastic sheet have been When the centrifuge is separated, the plastic sheet is pushed by the airflow and still moves on the inclined plane 113, but when it encounters the limiting convex ball 115, it will be bounced and fall, and then fall into the receiving pipe 22 and enter the sorting bin 2. The multi-directional combined air outlet pipe 25 in the sorting bin 2 discharges air, so that the airflow circulates along the inner wall of the circulation cover 21. The plastic sheet falls from the receiving pipe 22 and is discharged along the receiving pipe 22 to the circulation cover 21, and circulates with the movement of the airflow, thereby entering the sorting pipe 24, and then enters the discharge pipe 3 in turn, and moves along the bottom of the discharge pipe 3 with the airflow, and slides along the low position of the guide slope 32 to lift one end of the plastic sheet, and the lifted plastic sheet continues to move against the limiting protrusion 321, and the other end is tilted due to inertia, and is pushed by the airflow to flip over and separate from the guide slope 32, so that the plastic sheet is flipped in the discharge pipe 3, thereby screening the plastic sheet through resistance.

[0044] Embodiment 2 A method for processing plastic particles comprises the following steps: S01, crushing the waste plastic products through a crusher to obtain plastic pieces of different sizes; S02, putting the plastic sheet into a stirring tank for stirring to preliminarily remove floating and easily removable liquids, completing pre-cleaning, and then putting the cleaned plastic sheet into an ultrasonic tank for fine cleaning; S03, putting the cleaned plastic sheets into the centrifugal dehydration bin 1 for dehydration, and the dehydrated plastic sheets are transported to the discharge pipe 3 through the sorting bin 2 to separate the intervals between the plastic sheets; S04. The plastic flakes are screened through the discharge pipe 3 to obtain two types of plastic flakes, namely large plastic flakes and small plastic flakes. The two types of plastic flakes are extruded into plastic particles through plastic screw extruders at different temperatures, which makes it easier to control the temperature.

[0045] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A plastic particle processing and recycling device, characterized in that: It comprises a centrifugal dehydration bin (1) and a sorting bin (2), wherein the sorting bin (2) is fixedly connected to a discharge pipe (3), and the discharge pipe (3) is provided with a material distribution trough (33); Wherein: after being dehydrated in the centrifugal dehydration bin (1), the plastic sheets enter the discharge pipe (3) from the sorting bin (2) and turn over along the discharge pipe (3) to enter or pass over the distribution trough (33).

2. A plastic particle processing and recovery device according to claim 1, characterized in that: The bottom surface of the discharge pipe (3) is provided with a guide slope (32), and the end of the guide slope (32) is provided with a limiting protrusion (321), and the plastic sheet turns over along with the limiting protrusion (321).

3. A plastic particle processing and recovery device according to claim 1, characterized in that: The centrifugal dehydration bin (1) comprises a water screening cover (11) and a water collecting cover (12). The water screening cover (11) is fixedly connected to an air and material pipe (16) for feeding materials. The plastic sheet moves along the inner wall of the water screening cover (11) with the air flow and turns over at a predetermined position.

4. A plastic particle processing and recovery device according to claim 3, characterized in that: Limiting slopes (111) are arranged in a staggered manner on the water screening cover (11), with the highest point of the limiting slopes (111) facing the air material pipe (16). A semi-annular air cover (13) for continuously discharging air is arranged inside the water screening cover (11).

5. A plastic particle processing and recovery device according to claim 3, characterized in that: The sorting bin (2) is provided with a material receiving pipe (22) extending into the water screening cover (11), and the water screening cover (11) is provided with a plurality of limiting convex balls (115) located at the top of the material receiving pipe (22), and the plastic sheets move or fall along the limiting convex balls (115).

6. The plastic particle processing and recycling device according to claim 1, characterized in that: The sorting bin (2) comprises a circulation cover (21) and a sorting pipe (24) connected to the discharge pipe (3), wherein a multi-directional combined air outlet pipe (25) is arranged in the circulation cover (21), and the sorting pipe (24) restricts the plastic sheets from entering the discharge pipe (3) in sequence.

7. A plastic particle processing and recovery device according to claim 6, characterized in that: The feed port of the sorting tube (24) is rotatably provided with a paddle (243), one end of which is provided with a lifting slope (242). The plastic sheets push against the paddle (243), driving the lifting slope (242) to extend into the circulation cover (21), so that subsequent plastic sheets are turned over and pass over the sorting tube (24).

8. The plastic particle processing and recycling device according to claim 1, characterized in that: A connecting air duct (31) is provided between the sorting bin (2) and the discharge pipe (3), and the air discharge of the connecting air duct (31) restricts the plastic sheet from being attached to the bottom of the discharge pipe (3).

9. The plastic particle processing and recycling device according to claim 4, characterized in that: The semi-annular wind hood (13), the water screening hood (11) is provided with an inclined plane (113), and a partition plate (132) is provided inside the semi-annular wind hood (13), the partition plate (132) guiding part of the airflow to be transported toward the inclined plane (113).

10. A method for processing plastic particles, characterized in that: The following steps are involved: S01, crushing the waste plastic products through a crusher to obtain plastic pieces of different sizes; S02, putting the plastic sheet into a stirring tank for pre-cleaning, and then putting it into an ultrasonic tank for fine cleaning; S03, placing the cleaned plastic sheets into a centrifugal dehydration bin (1) for dehydration, and the dehydrated plastic sheets are transported to a discharge pipe (3) through a sorting bin (2); S04. The plastic flakes are screened through the discharge pipe (3) to obtain plastic flakes of two specifications. The plastic flakes of the two specifications are extruded through plastic screw extruders at different temperatures to form plastic granules.

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