Foamed plastic recycling treatment equipment based on environmental protection and treatment method of foamed plastic recycling treatment equipment

Abstract

The invention relates to the technical field of foamed plastic recovery treatment, in particular to foamed plastic recovery treatment equipment based on environmental protection and a treatment method thereof.The foamed plastic recovery treatment equipment comprises a rack and a crusher arranged on the rack and further comprises a metal separation mechanism arranged on the rack; the metal separation mechanism comprises a separation bin, a roller and a metal sleeve; a feeding hole and a discharging hole which are communicated with the interior of the collecting cavity are formed in the top and the bottom of the separating bin; an electromagnetic adsorption assembly is arranged in the roller, and the end, close to the discharging cavity, of the roller is connected with a degaussing section; a linear driver and a servo motor are arranged on the outer side of the separating bin, a penetrating hole allowing the metal sleeve to penetrate through is formed in the partition plate, and a discharging opening communicating with the interior of the discharging cavity is further formed in the bottom of the separating bin; and an eddy current sorting machine is arranged below the separation bin, so that ferromagnetic metal is efficiently and automatically collected under the condition that manual intervention is not needed, and then the foamed plastic recycling efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of foam plastic recycling technology, specifically to an environmentally friendly foam plastic recycling equipment and its processing method. Background Technology

[0002] Foamed plastics, as a lightweight material with excellent thermal insulation and cushioning properties, are widely used in packaging, construction, and home appliances. However, large quantities of waste foamed plastics are difficult to degrade naturally, easily causing serious "white pollution." Therefore, the recycling and regeneration of foamed plastics has become an important issue for environmental protection and resource recycling.

[0003] For example, Chinese Patent Publication No. CN113752410A discloses an environmentally friendly foam plastic recycling device. This device includes a washing chamber, a separation chamber, an extrusion pelletizer, and other structures. After the foam plastic is washed in the washing chamber, impurities are separated in the separation chamber, and then the extrusion pelletizer completes the granulation. However, this device does not have a dedicated metal separation mechanism. It only removes light impurities through a suction device and cannot separate heavy impurities such as metals. Furthermore, the mainstream process for recycling foam plastic usually includes crushing, conveying, hot melting, and granulation. For metal impurities mixed in the recycled material, the common process is as follows: first, the waste foam plastic is crushed by a crusher, then ferromagnetic metals are initially removed by a magnetic separator, then the remaining material is conveyed to an eddy current separator to separate non-ferromagnetic metals such as copper and aluminum, and finally the purified foam plastic is hot-melted for regeneration.

[0004] However, in practical applications, especially in the effective separation and collection of ferromagnetic metal impurities, the existing magnetic separation units are limited to separation and lack efficient and automated collection capabilities. Whether it is a fixed magnetic grid or a rotating magnetic roller, their original design purpose is mainly to intercept or adsorb ferromagnetic impurities from the material flow. However, after adsorption, how to efficiently and cleanly remove and collect these metal impurities often depends on subsequent non-automated processing methods. Therefore, there is an urgent need for a foam plastic recycling and processing equipment that can separate and automatically collect metals. Summary of the Invention

[0005] To address the aforementioned issues, an environmentally friendly foam plastic recycling and processing device and method are provided. Through the cooperation of an electromagnetic adsorption component and a metal sleeve, ferromagnetic metal impurities in broken foam plastic can be continuously adsorbed. Then, the movable metal sleeve automatically moves the impurities and discharges them at a fixed point through the discharge port in the separation chamber, thus achieving efficient automatic collection of ferromagnetic metals without human intervention, thereby improving the efficiency of foam plastic recycling and processing.

[0006] To address the problems of the prior art, this invention application provides an environmentally friendly foam plastic recycling and processing equipment, including a frame and a crusher mounted on the frame, and a metal separation mechanism mounted on the frame;

[0007] The metal separation mechanism includes a separation chamber, a drum, and a metal sleeve; The separation chamber is located below the crusher. The interior of the separation chamber is divided into a collection chamber and a discharge chamber by a partition. The top and bottom of the separation chamber are provided with an inlet and an outlet that communicate with the inside of the collection chamber. The inlet is connected to the discharge end of the crusher. The drum is horizontal and rotatable and is located in the collection chamber. An electromagnetic adsorption component is installed inside the drum. A demagnetizing section adapted to the shape of the drum is connected to one end of the drum near the discharge chamber. The metal sleeve is fitted outside the drum and its inner wall is in contact with the outer surface of the drum. The outer side of the separation chamber is provided with a linear drive for driving the metal sleeve to move to the feeding chamber and a servo motor for driving the rotating drum to rotate. The partition is provided with a through hole for the metal sleeve to pass through. The bottom of the separation chamber is also provided with a discharge port that communicates with the inside of the feeding chamber. An eddy current separator is installed below the separation chamber, and the discharge port of the separation chamber is connected to the feed end of the eddy current separator.

[0008] Preferably, the electromagnetic adsorption assembly includes an electromagnetic coil, a conductive slip ring, and a brush; The center of the drum is provided with a hollow shaft extending along the axis. One end of the hollow shaft can rotatably penetrate the side wall of the separation chamber and extend outward. The extended end is connected to the output end of the servo motor through a coupling. The drum wall is provided with an annular interlayer cavity. The electromagnetic coil is embedded and fixed in the interlayer cavity along the axis of the drum. The conductive slip ring is coaxially fixedly mounted on the extension end of the hollow shaft via an insulating sleeve and rotates synchronously with the hollow shaft. The electromagnetic coil is electrically connected to the conductive slip ring via a wire. The brush is fixedly installed on the outside of the separation chamber corresponding to the conductive slip ring by an insulating bracket, and the carbon brush head of the brush maintains continuous sliding contact with the annular conductive surface of the conductive slip ring.

[0009] Preferably, the inner wall of the metal sleeve is provided with a plurality of strip-shaped limiting blocks equidistantly distributed along its axis, and the outer walls of the roller and the demagnetizing section are both provided with strip-shaped limiting grooves adapted to the strip-shaped limiting blocks.

[0010] Preferably, the demagnetizing section is made of a non-magnetic material.

[0011] Preferably, the output end of the linear actuator is provided with a drive plate extending into the downward material chamber, and a movable sleeve is connected to one end of the metal sleeve near the drive plate. The movable sleeve and the extended end of the drive plate are rotatably connected by a bearing.

[0012] Preferably, the inside of the feeding chamber is provided with a guide rod that is collinear with the axis of the rotating drum. One end of the guide rod away from the rotating drum is fixedly connected to the inner wall of the feeding chamber, and the other end of the guide rod is rotatably connected to the center of one end of the rotating drum through a bearing. The drive plate is provided with a guide sleeve that can move along the axis of the guide rod.

[0013] Preferably, the outer ends of the metal sleeve are respectively provided with sealing plates that can close the perforations of the partition.

[0014] Preferably, a rotatable shaft is horizontally arranged inside the discharge port, and a scraper extends radially around the outer circumference of the shaft. A rotary cylinder is provided at the bottom of the separation chamber, and the output end of the rotary cylinder is connected to one end of the shaft. The rotary cylinder can drive the shaft to rotate and move the scraper close to the outer wall of the metal sleeve inside the discharge chamber.

[0015] Preferably, a receiving frame for collecting metal is provided below the discharge port.

[0016] This invention also provides a method for recycling and processing foamed plastics based on environmental protection, comprising the following steps: S1. The waste foam plastic to be recycled is fed into the crusher for crushing to generate a mixed crushed material containing foam plastic fragments, ferromagnetic metal impurities and non-ferromagnetic metal impurities; the mixed crushed material is discharged from the discharge end of the crusher under the action of gravity and enters the collection chamber through the feed port at the top of the separation chamber. S2. Start the servo motor to drive the drum and its external metal sleeve to rotate at a constant speed; at the same time, control the electromagnetic adsorption component to be energized, so that the outer surface of the metal sleeve is magnetized; the mixed crushed material in the collection chamber flows over the outer wall of the rotating magnetized metal sleeve, and the ferromagnetic metal impurities are adsorbed and trapped on the surface of the metal sleeve, while the foam plastic mixture with the ferromagnetic metal initially removed is continuously discharged from the outlet at the bottom of the collection chamber. S3. When the ferromagnetic metal impurities adsorbed on the surface of the metal sleeve reach the preset working time, the unloading operation is performed. First, the electromagnetic adsorption component is de-energized. Then, the linear driver is started to push the metal sleeve to move horizontally, so that it passes through the perforation on the partition and completely enters the feeding chamber from the collection chamber and is sleeved on the demagnetizing section. Next, the servo motor is started again to drive the metal sleeve sleeved on the demagnetizing section to rotate. The ferromagnetic metal impurities that have lost magnetic adsorption fall off the surface of the metal sleeve under the action of centrifugal force and gravity, and are discharged and collected through the discharge port at the bottom of the feeding chamber. S4. The foam plastic mixture that has been demagnetized from the ferromagnetic metal discharged from step S2 falls directly into the feed end of the eddy current separator located directly below the discharge port. The eddy current separator is started to generate a high-frequency alternating magnetic field inside it. When the mixture flows through the magnetic field area, the copper and aluminum non-ferromagnetic metal impurities are repelled and ejected due to the eddy current generated by electromagnetic induction, thereby obtaining pure foam plastic fragments. S5. The pure foam plastic fragments obtained after screening by the eddy current separator are discharged from the discharge end of the separator and then processed.

[0017] The advantages of this invention compared to the prior art are: 1. This invention, through the cooperation of an electromagnetic adsorption component and a metal sleeve, can continuously adsorb ferromagnetic metal impurities in broken foam plastics. The impurities are then automatically moved by the movable metal sleeve and discharged and collected at a fixed point through the discharge port in the separation chamber. This achieves efficient automatic collection of ferromagnetic metals without human intervention, thereby improving the efficiency of foam plastic recycling.

[0018] 2. This invention generates a strong magnetic field by energizing a controllable electromagnetic adsorption component, which magnetizes the metal sleeve to efficiently adsorb ferromagnetic metals. During the unloading stage, the electromagnetic adsorption component is de-energized, the magnetic field actively disappears, and in conjunction with the demagnetization section, a double demagnetization is achieved, ensuring that the magnetic field strength is sufficiently attenuated, and ensuring that metal impurities fall off under the action of gravity without the need for manual scraping, thereby improving the recovery rate of ferromagnetic metal impurities in foam plastics. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of a foam plastic recycling and processing device based on environmental protection according to the present invention. Figure 1 .

[0020] Figure 2 This is a three-dimensional structural diagram of a foam plastic recycling and processing device based on environmental protection according to the present invention. Figure 2 .

[0021] Figure 3 This invention relates to the metal separation mechanism of an environmentally friendly foam plastic recycling and processing device. Figure 1 .

[0022] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0023] Figure 5 This invention relates to the metal separation mechanism of an environmentally friendly foam plastic recycling and processing device. Figure 2 .

[0024] Figure 6 yes Figure 5Enlarged view of section B in the middle.

[0025] Figure 7 This is a partial cross-sectional view of a foam plastic recycling and processing device based on environmental protection according to the present invention.

[0026] Figure 8 This invention relates to an environmentally friendly foam plastic recycling and processing device.

[0027] Figure 9 This is a partial three-dimensional structural diagram of the metal separation mechanism of an environmentally friendly foam plastic recycling and processing equipment according to the present invention. Figure 1 .

[0028] Figure 10 This is a partial three-dimensional structural diagram of the metal separation mechanism of an environmentally friendly foam plastic recycling and processing equipment according to the present invention. Figure 2 .

[0029] Figure 11 This is a partial breakdown of the metal separation mechanism of an environmentally friendly foam plastic recycling and processing equipment according to the present invention. Figure 1 .

[0030] Figure 12 This is a partial breakdown of the separation mechanism of a foam plastic recycling and processing device based on environmental protection, according to the present invention. Figure 2 .

[0031] Figure 13 This is a partial breakdown of the separation mechanism of a foam plastic recycling and processing device based on environmental protection, according to the present invention. Figure 3 .

[0032] The diagram is labeled as follows: 1. Frame; 2. Crusher; 3. Metal separation mechanism; 31. Separation chamber; 311. Baffle plate; 3111. Perforation; 312. Collection chamber; 313. Feed chamber; 314. Feed inlet; 315. Discharge outlet; 316. Discharge port; 317. Guide rod; 318. Rotating shaft; 3181. Scraper; 319. Rotary cylinder; 32. Drum; 33. Metal sleeve; 331. Middle... 332. Hollow shaft; 333. Interlayer cavity; 334. Strip-shaped limiting block; 335. Strip-shaped limiting groove; 336. Sealing plate; 34. Electromagnetic adsorption assembly; 347. Electromagnetic coil; 348. Conductive slip ring; 349. Brush; 35. Demagnetizing section; 36. Linear actuator; 361. Drive plate; 3611. Guide sleeve; 362. Moving sleeve; 37. Servo motor; 38. Receiving frame; 4. Eddy current separator. Detailed Implementation

[0033] To further understand the features, technical means, and specific objectives and functions achieved by this invention application, the invention application will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0034] Reference Figures 1 to 10 As shown: An environmentally friendly foam plastic recycling and processing equipment includes a frame 1 and a crusher 2 mounted on the frame 1, and also includes a metal separation mechanism 3 mounted on the frame 1; The metal separation mechanism 3 includes a separation chamber 31, a drum 32, and a metal sleeve 33; The separation chamber 31 is located below the crusher 2. The separation chamber 31 is equipped with a partition 311, which divides the interior of the separation chamber 31 into a collection chamber 312 and a discharge chamber 313. The top and bottom of the separation chamber 31 are equipped with an inlet 314 and an outlet 315 that communicate with the interior of the collection chamber 312. The inlet 314 is connected to the discharge end of the crusher 2. The roller 32 is horizontal and rotatable in the collection chamber 312. An electromagnetic adsorption component 34 is provided in the roller 32. A demagnetizing section 35 adapted to the shape of the roller 32 is connected to one end of the roller 32 near the discharge chamber 313. The metal sleeve 33 is sleeved on the outside of the drum 32 and its inner wall is in contact with the outer surface of the drum 32. The outer side of the separation chamber 31 is provided with a linear driver 36 for driving the metal sleeve 33 to move to the discharge chamber 313 and a servo motor 37 for driving the rotating drum 32 to rotate. The partition 311 is provided with a through hole 3111 for the metal sleeve 33 to pass through. The bottom of the separation chamber 31 is also provided with a discharge port 316 communicating with the inside of the discharge chamber 313. An eddy current separator 4 is provided below the separation chamber 31, and the discharge port of the separation chamber 31 is connected to the feed end of the eddy current separator 4.

[0035] When the equipment starts operating, waste foam plastic is crushed into uniformly sized crushed material by the crusher 2. During this process, ferromagnetic metals such as iron nails and iron wires, as well as non-ferromagnetic metals such as copper wires and aluminum sheets, are mixed in and discharged from the discharge end of the crusher 2 along with the crushed material. Under the action of gravity, the crushed material enters the collection chamber 312 of the separation chamber 31 through the feed inlet 314. At this time, the servo motor 37 starts and drives the drum 32 to rotate uniformly around its axis at a preset speed. At the same time, the electromagnetic adsorption component 34 is energized and generates a stable strong magnetic field. This magnetic field penetrates the wall of the drum 32, causing the metal sleeve 33 tightly fitted on the outside of the drum 32 to be strongly magnetized. The continuous rotation of the drum 32 causes the outer surface of the magnetized metal sleeve 33 to move relative to the crushed material flow in the collection chamber 312. During this process, ferromagnetic metal impurities in the crushed material are quickly and firmly adsorbed onto the outer wall of the metal sleeve 33 under the action of the magnetic field, while the extremely light and non-magnetic foam plastic fragments continue to move towards the bottom of the collection chamber 312 under the action of the rotation of the drum 32 and their own gravity, and are finally discharged from the collection chamber 312 through the discharge port 315. The material discharged from the discharge port 315 (at this point, most of the ferromagnetic metal impurities have been removed) falls directly into the feed end of the eddy current separator 4 located directly below. A sealing cover connects the discharge port 315 and the feed end of the eddy current separator 4 to prevent dust from overflowing and to ensure that the material slides smoothly. The eddy current separator 4 is based on the principle of electromagnetic induction. It uses an alternating magnetic field to induce eddy currents in non-ferrous metals such as copper and aluminum, generating a repulsive force that separates and ejects them from the material flow, thereby removing non-ferrous metals. The pure foam plastic with metal impurities removed is discharged from the eddy current separator 4 and enters the subsequent hot melt process. When it is necessary to clean the ferromagnetic impurities on the outer wall of the metal sleeve 33, the servo motor 37 pauses and the linear actuator 36 starts. The linear actuator 36 is preferably a cylinder or an electric push rod. Its output end pushes the metal sleeve 33 to move horizontally along the axis of the drum 32. The metal sleeve 33 smoothly passes through the perforation 3111 on the partition 311, completely enters the discharge chamber 313 from the collection chamber 312, and finally has its front end fitted on the demagnetizing section 35. Subsequently, the electromagnetic adsorption component 34 stops working, and the magnetic field on the outer wall of the metal sleeve 33 disappears or weakens to an extremely weak level. At this time, the servo motor 37 starts again briefly, driving the drum 32 and the metal sleeve 33 to rotate at a low speed. The ferromagnetic impurities that have lost magnetic adsorption are peeled off from the surface of the metal sleeve 33 under the dual action of centrifugal force and gravity, and are discharged and collected at a fixed point through the discharge port 316 at the bottom of the discharge chamber 313. After the unloading is completed, the linear actuator 36 pulls the metal sleeve 33 to reset, ready for the next working cycle.

[0036] Reference Figures 3 to 7 and Figure 11 As shown: The electromagnetic adsorption component 34 includes an electromagnetic coil 341, a conductive slip ring 342, and a brush 343. The center of the drum 32 is provided with a hollow shaft 331 extending along the axis. One end of the hollow shaft 331 can rotatably penetrate the side wall of the separation chamber 31 and extend outward. The extended end is connected to the output end of the servo motor 37 through a coupling. The drum wall of the drum 32 is provided with an annular interlayer cavity 332. The electromagnetic coil 341 is embedded and fixed in the interlayer cavity 332 along the axial direction of the drum 32. The conductive slip ring 342 is coaxially fitted onto the extension end of the hollow shaft 331 via an insulating sleeve and rotates synchronously with the hollow shaft 331. The electromagnetic coil 341 is electrically connected to the conductive slip ring 342 via a wire. The brush 343 is fixedly installed on the outside of the separation chamber 31 at a position corresponding to the conductive slip ring 342 via an insulating bracket. The carbon brush head of the brush 343 maintains continuous sliding contact with the annular conductive surface of the conductive slip ring 342.

[0037] The brush 343 is electrically connected to an external power source. When it is necessary to screen ferromagnetic metal impurities, the brush 343 transmits current to the conductive slip ring 342 that rotates synchronously with the drum 32. The current is then transmitted to the electromagnetic coil 341 embedded in the wall of the drum 32 via a wire. Although the drum 32, the hollow shaft 331 and the conductive slip ring 342 are rotating continuously, the fixed brush 343 maintains the physical connection of the circuit and the stable transmission of current through sliding contact with the rotating conductive ring. This allows the electromagnetic coil 341 embedded in the rotating drum 32 to continuously obtain electrical energy and generate a magnetic field. The generated magnetic field cooperates with the metal sleeve 33 to adsorb ferromagnetic metal onto the surface of the metal sleeve 33. When it is necessary to eliminate the magnetic field, the control brush 343 demagnetizes the electromagnetic coil 341, so that the ferromagnetic metal impurities can be quickly demagnetized on the surface of the metal sleeve 33.

[0038] Reference Figure 12 As shown: The inner wall of the metal sleeve 33 is provided with a plurality of strip-shaped limiting blocks 333 equidistantly distributed along its axis, and the outer walls of the roller 32 and the demagnetizing section 35 are both provided with strip-shaped limiting grooves 334 that are adapted to the strip-shaped limiting blocks 333.

[0039] When the metal sleeve 33 is fitted onto the roller 32, the strip-shaped limiting block 333 on its inner wall is embedded in the strip-shaped limiting groove 334 on the surface of the roller 32. First, when the servo motor 37 drives the drum 32 to rotate, the strip-shaped limiting block 333 and the strip-shaped limiting groove 334 cooperate to drive the metal sleeve 33 to rotate synchronously, ensuring that the relative movement between the material and the surface of the magnetized sleeve is stable and effective during the adsorption process. Secondly, when the linear actuator 36 pushes the metal sleeve 33 to move axially, the strip-shaped limiting block 333 slides along the strip-shaped limiting groove 334, providing the sleeve with a precise linear motion trajectory and preventing it from deflecting or getting stuck during movement.

[0040] Reference Figures 2 to 7 and Figures 11 to 12 As shown: The demagnetizing section 35 is made of a non-magnetic material.

[0041] When the metal sleeve 33, which has adsorbed ferromagnetic impurities, is pushed to the unloading chamber 313 by the linear actuator 36, the metal sleeve 33 detaches from the magnetic roller 32 and instead fits onto the demagnetizing section 35 made of non-magnetic material. The moving distance between the metal sleeve 33 and the electromagnetic coil 341 is greater than the effective range of the magnetic field, and the non-magnetic material has extremely high magnetic resistance, which can effectively block the transmission of magnetic lines of force. At this time, the electromagnetic coil 341 stops working. Even if a weak magnetism remains on the metal sleeve 33 due to the residual magnetism effect, the physical isolation effect of the demagnetizing section 35 can cause the magnetic field strength on the surface of the metal sleeve 33 to decrease sharply to a level that cannot adsorb metal impurities. Combined with the active power-off of the electromagnetic coil 341, a dual guarantee mechanism of active power-off demagnetization and physical isolation magnetic resistance is formed, ensuring that the ferromagnetic impurities can be peeled off under the action of gravity.

[0042] Reference Figure 9 , Figure 10 and Figure 12 As shown: The output end of the linear actuator 36 is provided with a drive plate 361 extending into the downward material chamber 313. The end of the metal sleeve 33 near the drive plate 361 is connected to a movable sleeve 362. The movable sleeve 362 and the extended end of the drive plate 361 are rotatably connected by a bearing.

[0043] The linear actuator 36 transmits thrust to the movable sleeve 362, which is fixedly connected to the metal sleeve 33, through the drive plate 361 at its output end, thereby driving the entire metal sleeve 33 to move precisely axially. The movable sleeve 362 is connected to the drive plate 361 through a bearing, allowing relative rotation between the movable sleeve 362 and the drive plate 361. Therefore, when the metal sleeve 33 rotates, the movable sleeve 362 will rotate accordingly, while the drive plate 361, which is connected to it through the bearing, remains stationary. This completely decouples the linear actuator 36 from the rotational motion, ensuring that the linear actuator 36 is not affected by rotational torque when only performing push-pull actions.

[0044] Reference Figure 9 and Figure 10 As shown: The inside of the feeding chamber 313 is provided with a guide rod 317 that is collinear with the axis of the rotating drum 32. One end of the guide rod 317 away from the rotating drum 32 is fixedly connected to the inner wall of the feeding chamber 313. The other end of the guide rod 317 is rotatably connected to the center of one end of the rotating drum 32 through a bearing. The drive plate 361 is provided with a guide sleeve 3611 that can move along the axis of the guide rod 317.

[0045] The guide rod 317, which is collinear with the axis of the roller 32, provides a precise linear motion reference for the movement of the drive plate 361 and the metal sleeve 33. The guide sleeve 3611 on the drive plate 361 slides along the guide rod 317, eliminating any possible swaying or shaking during the movement, and ensuring the straightness of the movement of the metal sleeve 33 and its alignment with the perforation 3111. Meanwhile, the end of the guide rod 317 near the roller 32 is connected to the center of the roller 32 through a bearing, providing an additional, stable radial support point for the rotating roller 32, thereby enhancing the rigidity and dynamic balance of the roller 32 during rotation.

[0046] Reference Figures 3 to 6 and Figure 9 and Figure 10 As shown: The outer ends of the metal sleeve 33 are respectively provided with sealing plates 335 that can close the perforations 3111 of the partition 311.

[0047] The sealing plates 335 at both ends of the metal sleeve 33 move together with the metal sleeve 33. When the metal sleeve 33 is in the collection chamber 312 for adsorption, one of the sealing plates 335 is in close contact with the partition 311, completely covering the perforation 3111. When the metal sleeve 33 is pushed into the discharge chamber 313 for unloading, the other sealing plate 335 moves to the position of the partition 311, similarly covering the perforation 3111. This effectively prevents foam plastic debris in the collection chamber 312 from leaking into the discharge chamber 313 through the perforation 3111. It also prevents metal impurities or dust that fall off in the discharge chamber 313 from entering the collection chamber 312 through the perforation 3111 and mixing into the preliminarily purified foam plastic.

[0048] Reference Figure 13 As shown: A rotatable shaft 318 is horizontally arranged inside the discharge port 316 of the separation chamber 31. A scraper 3181 extends radially around the outer periphery of the shaft 318. A rotary cylinder 319 is provided at the bottom of the separation chamber 31. The output end of the rotary cylinder 319 is connected to one end of the shaft 318. The rotary cylinder 319 can drive the shaft 318 to rotate and drive the scraper 3181 to move close to the outer wall of the metal sleeve 33 in the discharge chamber 313.

[0049] When the metal sleeve 33 moves to the feeding chamber 313 and rotates to shake off the adsorbed impurities, the rotary cylinder 319 is activated. The rotary cylinder 319 drives the rotating shaft 318 to rotate 180 degrees, causing the scraper 3181 fixed on the rotating shaft 318 to rise and approach the outer wall of the rotating metal sleeve 33. As the metal sleeve 33 rotates, the scraper 3181 can scrape off the stubborn impurities that are difficult to remove by gravity alone. The scraped impurities are discharged directly through the discharge port 316 below, ensuring that the surface of the metal sleeve 33 is clean before each reset, thereby maintaining the next adsorption and avoiding the accumulation of impurities that affect the adsorption effect.

[0050] Reference Figure 2 , Figure 3 and Figure 5 As shown: A receiving frame 38 for collecting metal is provided below the discharge port 316.

[0051] Ferromagnetic metal impurities discharged from the discharge port 316 fall directly into the movable receiving box 38 placed directly below under the action of gravity. Operators only need to periodically remove, empty and return the full receiving box 38 to its original position.

[0052] A method for recycling and processing foamed plastics based on environmental protection includes the following steps: S1. The waste foam plastic to be recycled is put into the crusher 2 for crushing to generate a mixed crushed material containing foam plastic fragments, ferromagnetic metal impurities and non-ferromagnetic metal impurities. The mixed crushed material is discharged through the discharge end of the crusher 2 under the action of gravity and enters the collection chamber 312 through the feed inlet 314 at the top of the separation chamber 31. S2. Start the servo motor 37 to drive the drum 32 and its external metal sleeve 33 to rotate at a constant speed; at the same time, control the electromagnetic adsorption component 34 to be energized, so that the outer surface of the metal sleeve 33 is magnetized, and the mixed crushed material in the collection chamber 312 flows over the outer wall of the rotating magnetized metal sleeve 33. The ferromagnetic metal impurities are adsorbed and trapped on the surface of the metal sleeve 33, while the foam plastic mixture with the ferromagnetic metal initially removed is continuously discharged from the discharge port 315 at the bottom of the collection chamber 312. S3. When the ferromagnetic metal impurities adsorbed on the surface of the metal sleeve 33 reach the preset working time, the unloading operation is performed. First, the electromagnetic adsorption component 34 is de-energized. Then, the linear driver 36 is started to push the metal sleeve 33 to move horizontally, so that it passes through the perforation 3111 on the partition 311 and completely enters the discharge chamber 313 from the collection chamber 312, and is sleeved on the demagnetizing section 35. Next, the servo motor 37 is started again to drive the metal sleeve 33 sleeved on the demagnetizing section 35 to rotate. The ferromagnetic metal impurities that have lost magnetic adsorption fall off the surface of the metal sleeve 33 under the action of centrifugal force and gravity, and are discharged and collected through the discharge port 316 at the bottom of the discharge chamber 313. S4. The foam plastic mixture that has been demagnetized from the ferromagnetic metal discharged from step S2 falls directly into the feed end of the eddy current separator 4 located directly below the discharge port 315. The eddy current separator 4 is started to generate a high-frequency alternating magnetic field inside it. When the mixture flows through the magnetic field area, the copper and aluminum non-ferromagnetic metal impurities are repelled and ejected due to the eddy current generated by electromagnetic induction, thereby obtaining pure foam plastic fragments. S5. The pure foam plastic fragments obtained after being screened by the eddy current separator 4 are discharged from the discharge end of the separator and then processed.

[0053] The above embodiments only illustrate one or more implementation methods of this invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this invention, and these all fall within the protection scope of this invention. Therefore, the protection scope of this invention should be determined by the appended claims.

Claims

1. An environmentally friendly foam plastic recycling and processing equipment, comprising a frame (1) and a crusher (2) mounted on the frame (1), characterized in that, It also includes a metal separation mechanism (3) mounted on the frame (1); The metal separation mechanism (3) includes a separation chamber (31), a roller (32) and a metal sleeve (33); The separation chamber (31) is located below the crusher (2). The separation chamber (31) is equipped with a partition (311) inside, which divides the interior of the separation chamber (31) into a collection chamber (312) and a discharge chamber (313). The top and bottom of the separation chamber (31) are equipped with an inlet (314) and an outlet (315) that communicate with the interior of the collection chamber (312). The inlet (314) is connected to the discharge end of the crusher (2). The roller (32) is horizontal and rotatable in the collection chamber (312). An electromagnetic adsorption component (34) is provided in the roller (32). A demagnetizing section (35) adapted to its shape is connected to one end of the roller (32) near the discharge chamber (313). The metal sleeve (33) is sleeved on the outside of the drum (32) and its inner wall is attached to the outer surface of the drum (32). The outer side of the separation chamber (31) is provided with a linear driver (36) for driving the metal sleeve (33) to move to the discharge chamber (313) and a servo motor (37) for driving the rotating drum (32) to rotate. The partition (311) is provided with a through hole (3111) for the metal sleeve (33) to pass through. The bottom of the separation chamber (31) is also provided with a discharge port (316) that communicates with the inside of the discharge chamber (313). An eddy current separator (4) is provided below the separation chamber (31), and the discharge port of the separation chamber (31) is connected to the feed end of the eddy current separator (4).

2. The foam plastic recycling and processing equipment based on environmental protection according to claim 1, characterized in that, The electromagnetic adsorption assembly (34) includes an electromagnetic coil (341), a conductive slip ring (342), and a brush (343). The center of the drum (32) is provided with a hollow shaft (331) extending along the axis. One end of the hollow shaft (331) can rotatably pass through the side wall of the separation chamber (31) and extend outward. The extended end is connected to the output end of the servo motor (37) through a coupling. The drum (32) has an annular interlayer cavity (332) inside the drum wall. The electromagnetic coil (341) is embedded and fixed in the interlayer cavity (332) along the axis of the drum (32). The conductive slip ring (342) is coaxially fixedly mounted on the extension end of the hollow shaft (331) by an insulating sleeve and rotates synchronously with the hollow shaft (331). The electromagnetic coil (341) is electrically connected to the conductive slip ring (342) by a wire. The brush (343) is fixedly installed on the outside of the separation chamber (31) corresponding to the position of the conductive slip ring (342) by an insulating bracket. The carbon brush head of the brush (343) maintains continuous sliding contact with the annular conductive surface of the conductive slip ring (342).

3. The foam plastic recycling and processing equipment based on environmental protection according to claim 2, characterized in that, The inner wall of the metal sleeve (33) is provided with a plurality of strip-shaped limiting blocks (333) distributed at equal intervals along its axis, and the outer walls of the roller (32) and the demagnetizing section (35) are provided with strip-shaped limiting grooves (334) that are adapted to the strip-shaped limiting blocks (333).

4. The foam plastic recycling and processing equipment based on environmental protection according to claim 1, characterized in that, The demagnetizing section (35) is made of a non-magnetic material.

5. The foam plastic recycling and processing equipment based on environmental protection according to claim 1, characterized in that, The output end of the linear actuator (36) is provided with a drive plate (361) extending into the lower feed chamber (313). A movable sleeve (362) is connected to one end of the metal sleeve (33) near the drive plate (361). The movable sleeve (362) and the extended end of the drive plate (361) are rotatably connected by a bearing.

6. The foam plastic recycling and processing equipment based on environmental protection according to claim 5, characterized in that, The material feeding chamber (313) is horizontally provided with a guide rod (317) that is collinear with the axis of the rotating drum (32). One end of the guide rod (317) away from the rotating drum (32) is fixedly connected to the inner wall of the material feeding chamber (313). The other end of the guide rod (317) is rotatably connected to the center of one end of the rotating drum (32) through a bearing. The drive plate (361) is provided with a guide sleeve (3611) that can move along the axis of the guide rod (317).

7. The foam plastic recycling and processing equipment based on environmental protection according to claim 1, characterized in that, The metal sleeve (33) is provided with sealing plates (335) at both ends of its outer side, which can close the perforations (3111) of the partition (311).

8. The environmentally friendly foam plastic recycling and processing equipment according to claim 1, characterized in that, A rotating shaft (318) is horizontally arranged inside the discharge port (316) of the separation chamber (31). A scraper (3181) extends radially around the outer periphery of the rotating shaft (318). A rotary cylinder (319) is provided at the bottom of the separation chamber (31). The output end of the rotary cylinder (319) is connected to one end of the rotating shaft (318). The rotary cylinder (319) can drive the rotating shaft (318) to rotate and drive the scraper (3181) to move close to the outer wall of the metal sleeve (33) in the discharge chamber (313).

9. The foam plastic recycling and processing equipment based on environmental protection according to claim 1, characterized in that, Below the discharge port (316) is a receiving frame (38) for collecting metal.

10. A method for processing foam plastic recycling equipment based on environmental protection, employing the foam plastic recycling equipment based on environmental protection as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. The waste foam plastic to be recycled is put into the crusher (2) for crushing to generate a mixed crushed material containing foam plastic fragments, ferromagnetic metal impurities and non-ferromagnetic metal impurities. The mixed crushed material is discharged through the discharge end of the crusher (2) under the action of gravity and enters the collection chamber (312) through the feed port (314) at the top of the separation chamber (31). S2. Start the servo motor (37) to drive the drum (32) and its external metal sleeve (33) to rotate at a constant speed; at the same time, control the electromagnetic adsorption component (34) to be energized, so that the outer surface of the metal sleeve (33) is magnetized, and the mixed crushed material in the collection chamber (312) flows over the outer wall of the rotating magnetized metal sleeve (33). The ferromagnetic metal impurities are adsorbed and trapped on the surface of the metal sleeve (33), while the foam plastic mixture that has been initially demagnetized is continuously discharged from the outlet (315) at the bottom of the collection chamber (312). S3. When the ferromagnetic metal impurities adsorbed on the surface of the metal sleeve (33) reach the preset working time, the unloading operation is performed. First, the electromagnetic adsorption component (34) is de-energized. Then, the linear driver (36) is started to push the metal sleeve (33) to move horizontally, so that it passes through the perforation (3111) on the partition (311) and completely enters the feeding chamber (313) from the collection chamber (312), and is sleeved on the demagnetizing section (35). Then, the servo motor (37) is started again to drive the metal sleeve (33) sleeved on the demagnetizing section (35) to rotate. The ferromagnetic metal impurities that have lost magnetic adsorption fall off the surface of the metal sleeve (33) under the action of centrifugal force and gravity, and are discharged and collected through the discharge port (316) at the bottom of the feeding chamber (313). S4. The foam plastic mixture that has been demagnetized from the ferromagnetic metal discharged from step S2 falls directly into the feed end of the eddy current separator (4) located directly below the discharge port (315). The eddy current separator (4) is started to generate a high-frequency alternating magnetic field inside it. When the mixture flows through the magnetic field area, the copper and aluminum non-ferromagnetic metal impurities are repelled and ejected due to the eddy current generated by electromagnetic induction, thereby obtaining pure foam plastic fragments. S5. The pure foam plastic fragments obtained after being screened by the eddy current separator (4) are discharged from the discharge end of the separator and then processed.

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