A device for removing iron from plastic particles

Abstract

This invention discloses a plastic granule iron removal device, comprising a housing containing, from top to bottom, a centrifugal chamber, a crushing chamber, and a magnetic suction chamber. A feeding assembly with a collision structure is located at the top of the housing. The centrifugal chamber contains a centrifugal disc and a centrifugal motor. The crushing chamber contains a crushing plate with a downward discharge channel and a corresponding crushing disc. Multiple electromagnetic magnetic suction plates are rotatably mounted on the circumferential sidewalls of the magnetic suction chamber, driven synchronously by a linkage mechanism, alternating between a magnetic suction state facing inwards and a rejection state facing outwards. An iron collection groove surrounds the magnetic suction plates. An airflow suspension plate with multiple airflow nozzles is located at the bottom of the magnetic suction chamber, allowing the plastic granules to be suspended in a boiling state. The airflow suspension plate is rotatably mounted on the housing. A discharge port and a receiving mechanism are located below it. This invention achieves efficient separation of tiny iron filings through multi-stage synergistic action, and the magnetic suction surface can be automatically switched for cleaning, making it suitable for continuous operation.

Description

Technical Field

[0001] This invention relates to the field of plastic pellet recycling technology, specifically to a plastic pellet iron removal device. Background Technology

[0002] In the field of plastic pellet recycling, the pellets obtained after crushing waste plastics often contain metallic impurities such as iron nails, iron filings, and iron powder. If these impurities are not effectively removed before melt granulation or injection molding, they will not only affect the quality of the final product but may also damage processing equipment. Therefore, iron removal is a crucial step in the plastic pellet recycling process.

[0003] Existing technologies include various iron removal devices for plastic granules. Some devices use centrifugal throwing combined with tapping and kneading to mechanically separate plastic granules from iron filings, followed by adsorption using electromagnets. These devices are effective for separating larger or loosely attached iron filings. However, their core drawback is that electromagnets are typically fixed, making it difficult to automatically clean them during continuous operation. Long-term operation leads to iron filings accumulating and causing the magnetic field to weaken, significantly reducing adsorption capacity. Furthermore, for tiny iron filings (such as iron powder) embedded in the surface pits of plastic granules or tightly adsorbed by electrostatics, mechanical kneading and passive adsorption by a fixed magnetic field alone are insufficient for complete separation, resulting in unsatisfactory iron removal and requiring frequent shutdowns for maintenance, severely impacting production efficiency.

[0004] Therefore, how to efficiently and thoroughly separate tiny iron filings from plastic granules in continuous operation is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] In view of the shortcomings of existing plastic granule iron removal devices in terms of efficiency and thoroughness in separating tiny iron filings during continuous operation, the technical problem to be solved by the present invention is: how to provide a plastic granule iron removal device that can achieve efficient and deep iron removal in continuous operation and has an automatic magnetic surface cleaning function.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] A plastic granule iron removal device includes a housing, inside which, from top to bottom, are arranged a centrifugal chamber, a crushing chamber, and a magnetic suction chamber. A feeding assembly is located at the top of the housing, and the inner wall of the feeding assembly has a collision structure. The centrifugal chamber contains a centrifugal disc and a centrifugal motor that drives the centrifugal disc to rotate. A crushing plate is fixedly installed in the crushing chamber, and the crushing plate has a lower leakage channel connecting the centrifugal chamber and the crushing chamber; a crushing disc is located below the crushing plate, and the crushing disc is driven by the centrifugal motor, forming a crushing gap between the disc and the crushing plate for crushing the plastic granules. The magnetic suction chamber contains a magnetic separation mechanism, which includes: multiple magnetic plates rotatably mounted on the circumferential sidewalls of the magnetic suction chamber, each magnetic plate having a magnetic surface that is electrically controllable; a linkage mechanism that drives all magnetic plates to rotate synchronously; and an iron collection groove surrounding the outer wall of the housing and located below the magnetic plates. Driven by the linkage mechanism, the magnetic suction plate alternately operates in a magnetic suction state (magnetic surface facing inwards towards the magnetic suction cavity) and a rejection state (magnetic surface facing outwards towards the box). In the magnetic suction state, the magnetic surface is energized to attract iron filings; in the rejection state, the magnetic surface is de-energized, causing the iron filings to fall into the iron collection trough. An airflow suspension plate is located at the lower part of the magnetic suction cavity. The upper surface of the airflow suspension plate has multiple airflow nozzles to generate rising airflow, causing the falling plastic particles to form a boiling suspension state. The airflow suspension plate is rotatably mounted on the box and has a rotatable drive component to control its rotation. A discharge port is located below the airflow suspension plate, and a receiving mechanism for collecting the processed plastic particles is located below the discharge port.

[0008] Furthermore, both the lower surface of the rolling plate and the upper surface of the rolling disc are outwardly and downwardly inclined conical surfaces, and an equidistant or gradually changing rolling gap is formed between the two conical surfaces. This structure allows the plastic particles to slide towards the edge under their own gravity and be uniformly rolled, avoiding accumulation.

[0009] Furthermore, the linkage mechanism includes planetary gears fixedly mounted on the rotating shaft of each magnetic plate, a gear ring meshing with all planetary gears simultaneously, and a control motor driving one of the planetary gears or the gear ring to rotate. The planetary gear mechanism enables synchronous and precise rotation of all magnetic plates, ensuring efficient switching between the magnetic attraction and rejection states.

[0010] Furthermore, an elastic compensation element is embedded in the peripheral edge of the airflow suspension plate, and the elastic compensation element slides and seals against the inner wall of the magnetic suction cavity. This compensation element prevents plastic particles from falling directly from the edge gaps without undergoing suspension treatment, ensuring that all particles undergo a boiling suspension process.

[0011] Furthermore, the receiving mechanism includes a receiving hopper and a flexible dust cover disposed between the discharge port and the receiving hopper. The upper end of the flexible dust cover is fixedly connected to the discharge port, and the lower end is provided with an adjustable elastic hoop. This structure can adapt to receiving hoppers of different diameters and heights, while effectively preventing dust from flying away.

[0012] Furthermore, a support frame is provided at the bottom of the housing, and an adjustment groove is vertically opened on the support frame. A clamping arm is slidably disposed in the adjustment groove. One end of the clamping arm is connected to the elastic hoop, and the other end is selectively engaged with multiple positioning slots opened on the side wall of the adjustment groove through a plug-in block. Through this adjustment mechanism, the lower position of the flexible dust cover can be flexibly adjusted according to the actual height of the receiving bucket, improving the versatility of the equipment.

[0013] Furthermore, the collision structure includes collision blocks disposed on the inner wall of the feeding assembly. During the feeding process, the plastic particles collide with the collision structure, achieving initial mechanical separation.

[0014] Furthermore, the side wall of the magnetic suction cavity is provided with multiple rotating openings. The magnetic suction plate is rotatably connected to the rotating openings through the rotating shafts at the upper and lower ends. The size of the magnetic suction plate is adapted to the rotating openings to ensure smooth rotation and reduce the leakage of plastic particles in the magnetic suction state.

[0015] Furthermore, it also includes an iron filings confluence channel, one end of which is connected to the iron collection trough, and the other end leads to an iron collection box located outside the box body, so as to collect and process iron filings in a centralized manner.

[0016] Furthermore, the opening and closing of the airflow nozzle and the airflow magnitude are independently controlled by the control system to achieve segmented adjustment of different boiling intensities of plastic particles in the magnetic suction cavity, thereby adapting to the optimal separation conditions for particles of different sizes and moisture contents.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] (1) High-efficiency iron removal under continuous operation is achieved. By setting a rotatable electromagnetic magnetic suction plate and linkage mechanism, the magnetic suction surface can automatically switch between "adsorption state" and "rejection state". After adsorbing iron filings, the magnetic surface can be automatically cleaned without stopping the machine, which solves the problem of magnetic field attenuation caused by iron filings accumulation in the prior art, and significantly improves the continuous operation capability and iron removal efficiency of the equipment.

[0019] (2) More thorough separation of tiny iron filings. By setting up an airflow suspension plate in the magnetic suction cavity, the plastic particles are in a "boiling" suspension state under the action of the rising airflow. The particles rub and collide with each other, and the iron filings that were originally embedded in the micro pits on the particle surface or tightly attracted by electrostatics are fully exposed and detached. At the same time, multiple rotatable magnetic suction plates are arranged around, which can dynamically attract the suspended particles from multiple angles, avoiding the dead angles of traditional fixed magnetic field adsorption, and significantly improving the capture ability of tiny iron filings (such as iron powder).

[0020] (3) Multi-stage collaborative separation ensures stable and reliable iron removal quality. This invention integrates multiple mechanisms, including initial separation by feeding collision, centrifugal throwing separation, mechanical crushing separation, airflow boiling-assisted separation, and dynamic magnetic attraction final separation, forming a complete iron removal chain. The various stages cooperate with each other, ensuring a stable iron removal effect even when facing materials with high iron content or complex particle shapes, effectively improving the purity of recycled plastic particles. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this embodiment;

[0022] Figure 2 This is a cross-sectional view of the overall structure of this embodiment;

[0023] Figure 3 This is a schematic diagram of the linkage mechanism in this embodiment;

[0024] Figure 4 This is a partial cross-sectional view of the linkage mechanism in this embodiment;

[0025] Figure 5 This is a schematic diagram of the airflow suspension plate in this embodiment;

[0026] Figure 6 This is an example. Figure 2 Enlarged view of point A in the middle;

[0027] Figure 7 This is an exploded view of the receiving mechanism in this embodiment;

[0028] In the diagram: 1. Box body; 2. Feeding assembly; 6. Airflow suspension plate; 7. Drop port; 8. Receiving mechanism; 9. Supporting legs; 21. Collision block; 31. Centrifugal disc; 32. Centrifugal motor; 41. Rolling plate; 42. Rolling disc; 51. Magnetic suction plate; 52. Linkage mechanism; 53. Iron collection trough; 54. Rotating opening; 55. Iron chip confluence channel; 56. Iron collection box; 61. Airflow nozzle; 62. Tilting drive component; 63. Elastic compensation component; 81. Receiving bucket; 82. Flexible dust cover; 83. Elastic hoop; 91. Adjusting slide; 92. Clamping arm; 93. Insertion block; 94. Positioning slot; 411. Lower leakage channel; 521. Planetary gear; 522. Gear ring; 523. Control motor. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 a part of the embodiments of the present invention, not all of them. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product is in use. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] Example: Reference Figure 1 and Figure 2A plastic granule iron removal device includes a housing 1, inside which, from top to bottom, are arranged a centrifugal chamber, a crushing chamber, and a magnetic suction chamber. A feeding assembly 2 is located at the top of the housing 1, and the inner wall of the feeding assembly 2 has a collision structure; a support frame 9 is located at the bottom of the housing 1. A centrifugal disc 31 and a centrifugal motor 32 driving the centrifugal disc 31 to rotate are arranged inside the centrifugal chamber; a crushing plate 41 is fixedly arranged inside the crushing chamber, and a lower leakage channel 411 connecting the centrifugal chamber and the crushing chamber is opened on the crushing plate 41; a crushing disc 42 is arranged below the crushing plate 41, and the crushing disc 42 is drivenly connected to the centrifugal motor 32, forming a crushing gap with the crushing plate 41; a magnetic suction separation mechanism is arranged inside the magnetic suction chamber; an airflow suspension plate 6 is arranged at the lower part of the magnetic suction chamber; a discharge port 7 is arranged below the airflow suspension plate 6, and a receiving mechanism 8 is arranged below the discharge port 7.

[0033] refer to Figure 2 The feeding assembly 2 is funnel-shaped and fixedly installed on the top side of the housing 1. The inner wall of the feeding assembly 2 is provided with multiple collision blocks 21 distributed circumferentially. The collision blocks 21 are obliquely arranged flat plates, which together form a collision structure for performing preliminary mechanical impact on the incoming plastic particles, so as to loosen the iron filings attached to the surface.

[0034] refer to Figure 2 The centrifuge disc 31 is a circular disc, horizontally positioned inside the centrifuge chamber, with its center fixedly connected to the output shaft of the centrifuge motor 32 via a keyway. The centrifuge motor 32 is mounted on the top outer side of the housing 1, with its output shaft vertically downwards through the top wall of the housing 1 into the centrifuge chamber. The surface of the centrifuge disc 31 is provided with several radial guide ridges, used to project plastic particles in all directions during high-speed rotation.

[0035] refer to Figure 2 The crushing plate 41 is an annular plate, with its outer edge welded and fixed to the inner wall of the housing 1, separating the centrifugal chamber from the crushing chamber. A circular lower drain channel 411 is formed in the center of the crushing plate 41, the upper end of which is opposite to the outer edge of the centrifugal disc 31, used to receive plastic particles ejected by the centrifugal force. The lower surface of the crushing plate 41 is a conical surface sloping outwards and downwards. The crushing disc 42 is positioned directly below the crushing plate 41, its upper surface also being a conical surface sloping outwards and downwards, with the same taper as the lower surface of the crushing plate 41, forming an annular crushing gap of equal width between them. The center of the crushing disc 42 is connected to the lower end of the output shaft of the centrifugal motor 32 via a spline sleeve, rotating synchronously with the output shaft. When plastic particles fall from the lower drain channel 411 onto the upper surface of the crushing disc 42, they slide outwards under the action of centrifugal force and gravity. Passing through the crushing gap, they are squeezed by the relative movement of the crushing plate 41 and the crushing disc 42, further peeling iron filings from the surface of the plastic particles.

[0036] refer to Figure 2 and Figure 6The magnetic suction cavity is located below the compaction cavity, and its inner wall has multiple rotating openings 54 (four in this embodiment, evenly spaced) circumferentially. Each rotating opening 54 contains a magnetic suction plate 51. The magnetic suction plate 51 is rectangular, with rotating shafts fixed at its upper and lower ends, and is rotatably connected to the rotating slots above and below the rotating opening 54 via the rotating shafts. The side of the magnetic suction plate 51 facing the inside of the magnetic suction cavity is the magnetic suction surface, which contains an electromagnetic coil and is connected to an external power source via a wire, enabling power on / off control.

[0037] refer to Figure 3 and Figure 4 The magnetic separation mechanism further includes a linkage mechanism 52. The linkage mechanism 52 includes planetary gears 521 fixedly mounted on a rotating shaft above each magnetic plate 51, a gear ring 522 meshing with all planetary gears 521, and a control motor 523 driving one of the planetary gears 521 to rotate. The gear ring 522 is rotatably mounted on the outer wall of the housing 1 via bearings. The control motor 523 is fixed to the outer side of the housing 1, and a drive gear is mounted on its output shaft, meshing with one of the planetary gears 521. When the control motor 523 operates, it drives the planetary gear 521 to rotate, which in turn drives the remaining planetary gears 521 to rotate synchronously in the same direction via the gear ring 522, thereby causing all magnetic plates 51 to rotate synchronously around their respective rotating shafts. Driven by the linkage mechanism 52, the magnetic suction plate 51 can alternate between two working states: when the magnetic suction surface faces the inside of the magnetic suction cavity, it is in the magnetic suction state, at which time the electromagnetic coil is energized to generate a magnetic field and attract iron filings; when the magnetic suction surface faces the outside of the box 1, it is in the rejection state, at which time the electromagnetic coil is de-energized and the iron filings fall off naturally under the action of gravity.

[0038] refer to Figure 2 On the outer wall of the housing 1, below each rotating opening 54, a collecting groove 53 is arranged around it. The collecting groove 53 is an annular groove with its opening facing upwards, and its inner side is flush with the lower edge of the rotating opening 54, used to receive iron filings falling from the magnetic suction plate 51. An outlet is opened at the bottom of one side of the collecting groove 53, and this outlet is connected to the collecting box 56 located outside the housing 1 through the iron filings converging channel 55, so as to realize the centralized collection of iron filings.

[0039] refer to Figure 2 and Figure 5The airflow suspension plate 6 is located at the lower part of the magnetic suction cavity, below all the magnetic suction plates 51. The airflow suspension plate 6 is a circular plate with multiple airflow nozzles 61 evenly distributed on its upper surface. Each airflow nozzle 61 is connected to an airflow channel inside the plate, which is connected to an external air source and control system via a flexible hose. Rotary shafts are fixed to the front and rear sides of the airflow suspension plate 6, and these shafts are rotatably connected to bearing seats on the inner wall of the magnetic suction cavity. One side of the shaft extends outside the housing 1 and is connected to the output shaft of the flipping drive 62 (a servo motor in this embodiment). Under the control of the flipping drive 62, the airflow suspension plate 6 can flip between a horizontal position and a downwardly tilted unloading position. Elastic compensation members 63, which are silicone rubber strips, are embedded in the peripheral edge of the airflow suspension plate 6. These elastic compensation members 63 are in sliding and sealing contact with the inner wall of the magnetic suction cavity to prevent plastic particles from falling directly into the lower part of the plate from the edge gaps without being suspended.

[0040] refer to Figure 2 and Figure 7 The material discharge port 7 is located at the bottom center of the housing 1, directly below the airflow suspension plate 6. A receiving mechanism 8 is located below the material discharge port 7. The receiving mechanism 8 includes a receiving bucket 81 and a flexible dust cover 82. The flexible dust cover 82 is a funnel-shaped nylon cloth, with its upper large-diameter end fixedly connected to the bottom edge of the material discharge port 7 by a clamp, and its lower small-diameter end fixed with an elastic hoop 83 (in this embodiment, a ring-shaped spring steel ring). The support legs 9 consist of four columns fixed to the four corners of the bottom of the housing 1. Two opposing legs 9 have vertically opening adjustment grooves 91, each with a slidably mounted clamping arm 92. One end (inner end) of the clamping arm 92 is fixedly connected to the opposite sides of the elastic hoop 83, and the other end (outer end) of the clamping arm 92 has a plug-in block 93. Multiple positioning slots 94 are vertically spaced on the side wall of the adjustment groove 91 opposite to the clamping arm 92. The plug-in block 93 can be inserted into any positioning slot 94 to lock the height of the clamping arm 92. By pulling the clamping arm 92 outward to disengage the plug-in block 93 from the positioning slot 94, the clamping arm 92 can be moved up and down along the adjusting slide 91, thereby changing the suspension height and diameter of the elastic hoop 83 to accommodate receiving buckets 81 of different heights and diameters, and ensuring that the lower end of the flexible dust cover 82 is always in close contact with the opening of the receiving bucket 81 to prevent dust from escaping.

[0041] The following is the overall workflow of this embodiment:

[0042] During operation, the system first presets the rotation speed of the centrifugal motor 32, the airflow intensity of the nozzles of the airflow suspension plate 6, the magnetic attraction / rejection switching frequency of the magnetic suction plate 51, and the flipping sequence of the flipping drive component 62 according to the characteristics of the plastic granules to be processed. At the same time, the height of the clamping arm 92 is adjusted according to the actual size of the receiving hopper 81, so that the elastic hoop 83 is fitted on the opening of the receiving hopper 81, and the flexible dust cover 82 hangs down naturally to cover the opening of the hopper.

[0043] The equipment is started, and the centrifugal motor 32 drives the centrifugal disc 31 and the grinding disc 42 to rotate synchronously. The plastic granules to be processed are poured into the feeding assembly 2. The granules first collide with the collision block 21, causing some loosely attached iron filings to fall off. After falling into the high-speed rotating centrifugal disc 31, the granules are thrown outwards under centrifugal force, colliding secondary with the inner wall of the centrifugal chamber, further separating the iron filings. Larger iron filings, due to their greater mass, are thrown to the edge and discharged downwards. The plastic granules and remaining iron filings fall into the upper surface of the grinding disc 42 through the lower discharge channel 411, sliding outwards under the guidance of the inclined conical surface, entering the grinding gap between the grinding plate 41 and the grinding disc 42. As the grinding disc 42 rotates continuously, the granules are squeezed and rubbed in the grinding gap, forcibly peeling off any iron filings embedded in the granule surface or tightly adhered to it.

[0044] The crushed plastic granules and iron filings fall together into the magnetic suction chamber. At this time, the airflow nozzles 61 on the airflow suspension plate 6 continuously spray controllable airflow upwards, causing the plastic granules to be in a "boiling" suspension state within the magnetic suction chamber. The granules collide and rub against each other, exposing the iron filings that were originally wrapped inside the granules. At the same time, the static electricity generated by the friction makes it easier for the tiny iron filings to be captured by the magnetic field. Simultaneously, the control motor 523 drives the linkage mechanism 52, causing all the magnetic suction plates 51 to rotate synchronously at a set frequency (e.g., rotating 90 degrees every 30 seconds). When the magnetic suction surface faces the inside of the magnetic suction chamber, the magnetic suction surface is energized, forming a strong magnetic field that attracts the suspended iron filings (especially tiny iron powders) to the magnetic suction surface. When the magnetic suction surface rotates to a certain angle and faces the outside of the box, the magnetic suction surface is de-energized, and the iron filings automatically fall into the iron collection trough 53 under the action of gravity, and then are collected in the iron collection box 56 through the iron filings converging channel 55. This cycle is repeated to achieve continuous adsorption and automatic cleaning.

[0045] After the iron filings are fully adsorbed, the flipping drive 62 is activated, causing the airflow suspension plate 6 to flip downwards (e.g., 60 degrees). The plastic particles slide off the airflow suspension plate 6 under their own weight and with the assistance of airflow, falling through the discharge port 7 into the flexible dust cover 82, and finally into the receiving hopper 81 for collection. Throughout the process, due to the sealing effect of the elastic compensation component 63, the plastic particles will not leak from the edges of the airflow suspension plate 6 without undergoing suspension treatment, ensuring that all particles have undergone a complete boiling adsorption process.

[0046] The above process is repeated cyclically, realizing a fully automated and continuous iron removal operation for plastic granules, from feeding, centrifugation, crushing, airflow suspension, multi-angle dynamic magnetic attraction to final collection.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of the present invention without departing from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A device for removing iron from plastic granules, characterized in that, include: The box (1) has a centrifugal chamber, a crushing chamber and a magnetic suction chamber connected from top to bottom inside; The feeding assembly (2) is located on the top of the box (1), and its inner wall is provided with a collision structure; The centrifugation mechanism (3) includes a centrifugation disk (31) disposed in the centrifugation chamber and a centrifugation motor (32) for driving the centrifugation disk (31) to rotate. The rolling mechanism (4) includes a rolling plate (41) fixedly disposed in the rolling chamber and a rolling disc (42) disposed below the rolling plate (41). The rolling disc (42) is drivenly connected to the centrifugal motor (32) and forms a rolling gap with the rolling plate (41). The rolling plate (41) is provided with a lower leakage channel (411) connecting the centrifugal chamber and the rolling chamber. The magnetic separation mechanism includes: Multiple magnetic plates (51) are rotatably disposed on the circumferential sidewall of the magnetic cavity, and the magnetic surface of each magnetic plate (51) is an electromagnetic surface that can be controlled by switching on and off power. The linkage mechanism (52) drives all the magnetic plates (51) to rotate synchronously, so that the magnetic surface alternately enters the magnetic attraction state facing the inside of the magnetic cavity and the rejection state facing the outside of the box. The iron collecting trough (53) is arranged around the outer wall of the box (1) and located below the magnetic suction plate (51) to receive the iron filings that fall during the rejection process; An airflow suspension plate (6) is disposed at the lower part of the magnetic suction cavity. Multiple airflow nozzles (61) are provided on its upper surface to generate rising airflow so that the falling plastic particles form a boiling suspension state. The airflow suspension plate (6) is rotatably mounted on the box (1) and has a rotatable drive component (62) to control its rotatability. The material discharge port (7) is located below the airflow suspension plate (6); The receiving mechanism (8) is located below the discharge port (7) and is used to collect the processed plastic particles.

2. The iron removal device for plastic granules according to claim 1, characterized in that: The lower surface of the rolling plate (41) and the upper surface of the rolling disc (42) are both outwardly and downwardly inclined conical surfaces, and an equidistant or gradually changing rolling gap is formed between the two conical surfaces.

3. The iron removal device for plastic granules according to claim 1, characterized in that: The linkage mechanism (52) includes a planetary gear (521) fixedly mounted on the rotating shaft of each of the magnetic plates (51), a gear ring (522) meshing with all the planetary gears (521), and a control motor (523) that drives one of the planetary gears (521) or the gear ring (522) to rotate.

4. The iron removal device for plastic granules according to claim 1, characterized in that: The peripheral edge of the airflow suspension plate (6) is provided with an elastic compensation member (63), which slides and seals against the inner wall of the magnetic suction cavity.

5. The iron removal device for plastic granules according to claim 1, characterized in that: The receiving mechanism (8) includes a receiving bucket (81) and a flexible dust cover (82) disposed between the discharge port (7) and the receiving bucket (81). The upper end of the flexible dust cover (82) is fixedly connected to the discharge port (7), and the lower end is provided with an elastic hoop (83) with an adjustable diameter.

6. The iron removal device for plastic granules according to claim 5, characterized in that: The box (1) is provided with a support bracket (9) at the bottom. An adjustment groove (91) is vertically opened on the bracket (9). A clamping arm (92) is slidably arranged in the adjustment groove (91). One end of the clamping arm (92) is connected to the elastic hoop (83), and the other end is selectively engaged with multiple positioning slots (94) opened on the side wall of the adjustment groove (91) through a plug-in block (93).

7. The iron removal device for plastic granules according to claim 1, characterized in that: The collision structure includes a collision block (21) disposed on the inner wall of the feeding assembly (2).

8. The iron removal device for plastic granules according to claim 1, characterized in that: The magnetic suction cavity has multiple rotating openings (54) on its side wall. The magnetic suction plate (51) is rotatably connected to the rotating opening (54) through the rotating shafts at its upper and lower ends, and the size of the magnetic suction plate (51) is adapted to the rotating opening (54).

9. The iron removal device for plastic granules according to claim 1, characterized in that: It also includes an iron filings confluence channel (55), one end of which is connected to the iron collection trough (53), and the other end is connected to the iron collection box (56) located outside the box body (1).

10. The iron removal device for plastic granules according to claim 1, characterized in that: The opening and closing of the airflow nozzle (61) and the airflow magnitude are independently controlled by the control system to achieve segmented adjustment of different boiling intensities of plastic particles in the magnetic suction cavity.

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