A crushing and screening device for aluminum scrap recycling

Abstract

This invention discloses a crushing and screening device for aluminum waste recycling, relating to the field of aluminum waste recycling and processing technology. It includes a crusher assembly and a magnetic screening mechanism. The magnetic screening mechanism comprises a rotating impeller, an impact baffle, and a magnetic roller. The rotating impeller catches the aluminum scrap discharged from the crusher assembly and uses centrifugal force generated by its rotation to throw the scrap towards the impact baffle. The magnetic roller is positioned below the impact baffle. This invention uses a high-speed rotating impeller to project the crushed aluminum scrap from the crusher assembly towards the impact baffle. The impact causes iron embedded in or covered by the aluminum to loosen and separate, facilitating magnetic screening by the magnetic roller and improving the overall iron removal efficiency.

Description

Technical Field

[0001] This invention relates to the field of aluminum waste recycling technology, and in particular to a crushing and screening device for aluminum waste recycling. Background Technology

[0002] The recycled aluminum industry has become an important part of the non-ferrous metals industry. Compared with primary aluminum production, recycling waste aluminum can save a significant amount of energy and significantly reduce greenhouse gas emissions. Crushing and screening are key pre-treatment steps in the waste aluminum recycling process.

[0003] Currently, the recycling and processing of aluminum scrap involves first crushing the aluminum scrap into the appropriate size using crushing equipment, and then screening it. Some aluminum alloy door and window frames, aluminum-related parts from scrapped cars, etc., may contain sealing strips, iron connecting parts such as bolts, etc., which need to be screened and separated. Generally, air separation or eddy current separation equipment is used to screen out some non-metallic materials; iron impurities are removed by magnetic separation equipment.

[0004] However, currently, iron foreign objects contained in scrap aluminum are generally separated using magnetic separators such as suspended magnetic separators and drum magnetic separators. During high-speed crushing and conveying, some small or irregularly shaped iron filings are easily wrapped, covered or embedded inside the soft aluminum block or at bends, resulting in the phenomenon of aluminum-encased iron. This makes it difficult for the magnetic adsorption force to penetrate the aluminum layer and act on the iron impurities. In other words, the existing magnetic separation equipment is generally ineffective in removing iron impurities, resulting in excessive iron content in the final screened aluminum scrap, reducing the grade of scrap aluminum and affecting the purity of subsequent aluminum smelting. Summary of the Invention

[0005] The purpose of this invention is to provide a crushing and screening device for aluminum waste recycling, so as to solve the technical problem that the effect of removing iron impurities in the crushing and screening process of aluminum waste is generally not good in the prior art.

[0006] The technical problem to be solved by this invention can be achieved through the following technical solution: A crushing and screening device for aluminum scrap recycling includes a crusher assembly and a magnetic screening mechanism; the magnetic screening mechanism includes a rotating impeller, an impact baffle, and a magnetic roller; The rotating impeller is used to catch the aluminum scrap discharged from the crusher assembly and to throw the aluminum scrap toward the impact baffle by generating centrifugal force through rotation; the magnetic roller is arranged on one side below the impact baffle.

[0007] Preferably, multiple magnetic rollers are provided and arranged in a stepped manner, and all magnetic rollers rotate synchronously.

[0008] Preferably, the magnetic screening mechanism further includes an iron recovery mechanism, which includes a recovery base box and fixed scrapers. The recovery base box is located on one side below the magnetic roller. A barrier is fixedly connected above the recovery base box. Multiple fixed scrapers are provided and correspond to and contact the magnetic roller. Each fixed scraper is fixedly connected to the barrier.

[0009] Preferably, the magnetic screening mechanism further includes a mounting bracket and a drive mechanism for driving the impact baffle to reciprocate laterally; the impact baffle is slidably mounted on the mounting bracket, and the sliding trajectory line of the impact baffle is parallel to the central axis of the rotating impeller.

[0010] Preferably, the drive mechanism includes a transmission gear set, a cam, and a connecting slide; the rotating impeller drives the cam to rotate through the transmission gear set, and the connecting slide is fixedly connected to the impact baffle; the connecting slide slides through the mounting bracket, and a connecting spring connects the connecting slide and the mounting bracket, and the cam is configured to cooperate with the connecting slide.

[0011] Preferably, the transmission gear set includes a first steering helical gear, a second steering helical gear, and a linkage gear; the first steering helical gear, the second steering helical gear, the linkage gear, and the cam are all rotatably connected to the outside of the mounting bracket; the first steering helical gear and the rotating impeller are coaxially connected to a second synchronous pulley, and a second synchronous belt is connected between the two second synchronous pulleys; the second steering helical gear meshes with one side of the first steering helical gear; the second steering helical gear drives the cam to rotate through the linkage gear.

[0012] Preferably, the impact baffle has a plurality of protruding structures evenly distributed on its surface.

[0013] Preferably, the impact baffle includes a removable liner.

[0014] Preferably, the impact baffle is provided with an inclined guide plate on the side near the rotating impeller, and the inclined guide plate is positioned above the magnetic roller.

[0015] Preferably, the rotating impeller includes a central shaft and blades, wherein multiple blades are provided and are circumferentially and equidistantly fixedly connected to the central shaft.

[0016] The beneficial effects of this invention are: 1. This invention uses a high-speed rotating impeller to throw the crushed aluminum scraps from the crusher components toward the impact baffle. The impact causes the iron embedded in or covered by the aluminum to loosen and fall off, making it easier to be magnetically screened by the magnetic rollers, which helps to improve the overall screening and iron removal effect.

[0017] 2. The present invention distributes multiple magnetic rollers in a stepped manner so that the debris falling after impacting the impact baffle can contact the magnetic rollers for a longer period of time for magnetic attraction and iron removal. In addition, the stepped distribution of magnetic rollers can also easily catch the debris that bounces back to a certain extent after impacting the impact baffle, ensuring the contact effect between the magnetic rollers and the debris.

[0018] 3. During the process of the rotating impeller of the present invention propelling aluminum scrap at high speed onto the impact baffle, the rotating impeller can also drive the cam to rotate through the cooperation of the second synchronous belt and the transmission gear set. The rotating cam acts on the connecting slide of the impact baffle, thereby causing the connecting slide to drive the impact baffle to move back and forth continuously. This causes the aluminum scrap to be subjected to horizontal shearing force, which forms an orthogonal force with the vertical impact force. This is beneficial to intensify the movement of the scrap, thereby improving the forced dissociation effect on iron embedded or wrapped in aluminum, which is convenient for subsequent magnetic screening. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the relative positional distribution of the magnetic screening mechanism and the hammer crusher in this invention; Figure 3 This is a schematic diagram showing the relative positional distribution of the rotating impeller, impact baffle, and magnetic roller in this invention. Figure 4 This is a schematic diagram of the structure in this invention where the rotating impeller is connected to the impact baffle via a drive mechanism; Figure 5 This is a schematic diagram showing the relative positions of the impact baffle, magnetic roller, and iron recycling mechanism in this invention. Figure 6 This is a schematic diagram of the structure in this invention where the impact baffle is connected to the mounting bracket via a connecting slide. Figure 7 yes Figure 6 A magnified schematic diagram of the partial structure at point A in the middle; Figure 8 This is a schematic diagram of the structure in which the cam and the first steering helical gear are connected in this invention; Figure 9 This is a schematic diagram of the iron recycling mechanism in this invention; Figure 10 This is a schematic diagram of the state when the rotating impeller throws aluminum scraps toward the impact baffle in this invention.

[0020] Explanation of reference numerals in the attached figures: 1. Dual-shaft shredder; 2. Hammer crusher; 21. Discharge port; 3. Magnetic screening mechanism; 31. Mounting bracket; 32. Rotating impeller; 321. Blade plate; 33. Magnetic roller; 34. First synchronous pulley; 35. First synchronous belt; 36. Impact baffle; 361. Protruding structure; 37. Drive mechanism; 371. Second synchronous belt; 372. Connecting slide; 373. Connecting spring; 374. First steering helical gear; 375. Second steering helical gear; 376. Linkage gear; 377. Cam; 38. Iron material recycling mechanism; 381. Recycling bottom box; 382. Fixed scraper; 383. Enclosure; 39. Inclined guide plate; 4. Transfer conveyor belt mechanism; 5. Main conveyor belt mechanism. Detailed Implementation

[0021] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0022] like Figures 1-10 As shown, a crushing and screening device for aluminum waste recycling can be used to crush waste aluminum alloy doors and windows or aluminum composite parts from scrap automobiles and screen for ferrous materials, such as iron corner brackets, screws, or iron fasteners left over from installation on aluminum alloy doors and windows. The device includes a crusher assembly and a magnetic screening mechanism 3. The crusher assembly is used to convey the crushed aluminum waste to the magnetic screening mechanism 3 for ferrous material removal. It should be noted that the crusher assembly may include a dual-shaft shredder 1 and a hammer crusher 2. The dual-shaft shredder 1 is used to coarsely crush large pieces of aluminum waste. A transfer conveyor belt mechanism 4 is provided between the discharge end of the dual-shaft shredder 1 and the feed end of the hammer crusher 2. The transfer conveyor belt mechanism 4 is used to convey the coarsely crushed aluminum waste from the dual-shaft shredder 1 to the hammer crusher 2, where the hammer crusher 2 further crushes the coarsely crushed aluminum waste to obtain finer waste, facilitating magnetic screening to remove the contained ferrous waste.

[0023] The magnetic screening mechanism 3 includes a rotating impeller 32, an impact baffle 36, and a magnetic roller 33. The rotating impeller 32 is specifically positioned below the discharge port 21 of the hammer crusher 2 and is driven to rotate by a motor. Figure 10From the perspective shown, the rotating impeller 32 rotates clockwise. It catches the aluminum scrap discharged from the crusher assembly and uses centrifugal force generated by its rotation to throw the aluminum scrap towards the impact baffle 36. After the aluminum scrap hits the impact baffle 36, the scrap disperses, making it easier for the iron embedded in the aluminum to loosen under the action of inertia and collision, which is beneficial for subsequent magnetic separation. It should be noted that the rotating impeller 32 rotates at a high speed to ensure that the caught aluminum scrap is subjected to a sufficiently large centrifugal force to fly towards the impact baffle 36. At the same time, the high-speed rotation of the rotating impeller 32 can also drive and promote the aluminum scrap to tumble and collide, which is beneficial for loosening and falling off the iron material wrapped in it or the iron embedded in the aluminum, which is convenient for subsequent screening. The magnetic roller 33 is set on one side below the impact baffle 36, specifically on the side close to the rotating impeller 32. The magnetic roller 33 is a rotating drum with a permanent magnet inside. The magnetic roller 33 is used to generate magnetic force to attract the iron material in the aluminum scrap falling from the impact baffle 36.

[0024] Below the magnetic roller 33, a main conveyor belt mechanism 5 is also provided. The main conveyor belt mechanism 5 is used to catch the aluminum scraps falling from the magnetic roller 33, so that the aluminum scraps that have been magnetically removed can be conveyed to the next process. For example, an air classifier or eddy current separator can be connected to the end of the main conveyor belt mechanism 5 to remove non-magnetic waste, such as some rubber strips. Of course, a strong magnetic electromagnetic separator can also be installed above the conveying path of the main conveyor belt mechanism 5 to further remove any small amount of unremoved iron in the conveyed aluminum scraps by magnetic attraction, so as to ensure that the subsequent aluminum scraps have high purity and are easy to recycle.

[0025] In some specific implementation schemes, refer to Figure 3 and Figure 10 As shown, in order to ensure that the magnetic roller 33 effectively contacts the aluminum scraps that impact the impact baffle 36 and fall, and magnetically screens out the ferrous material, multiple magnetic rollers 33 are provided and arranged in a stepped manner, and all magnetic rollers 33 rotate synchronously; specifically, based on Figure 10 From the perspective shown, all magnetic rollers 33 rotate counterclockwise; one end of each magnetic roller 33 is coaxially fixedly connected to a first synchronous pulley 34, and each first synchronous pulley 34 is connected to the same first synchronous belt 35. One magnetic roller 33 acts as the active rotating component and is driven to rotate by a motor, while the other magnetic rollers 33 rotate synchronously by the cooperation of the first synchronous pulley 34 and the first synchronous belt 35.

[0026] During the rotation of the magnetic roller 33, the iron in the aluminum scrap is easily adsorbed by magnetic force. The multiple magnetic rollers 33 are distributed in a stepped manner so that the falling aluminum scrap passes through each magnetic roller 33 in sequence, which makes the contact time between the falling aluminum scrap and the distributed magnetic rollers 33 longer, thus improving the iron removal effect.

[0027] In some specific implementation schemes, in order to facilitate the effective recovery of iron adsorbed on the distributed magnetic rollers 33, combined with Figure 9 and Figure 10 As shown, the magnetic screening mechanism 3 also includes an iron material recycling mechanism 38, which includes a recycling bottom box 381 and fixed scrapers 382. The recycling bottom box 381 is located below the magnetic roller 33, specifically on the side of the magnetic roller 33 away from the rotating impeller 32. To facilitate the recycling bottom box 381 catching the iron material scraped off the magnetic roller 33 and avoid catching the falling aluminum material, the recycling bottom box 381 is positioned halfway below the bottom magnetic roller 33 away from the rotating impeller 32. The side of the recycling bottom box 381 away from the magnetic roller 33 also has an outlet for convenient centralized cleaning of iron. A barrier 383 is fixedly connected above the recycling bottom box 381. Multiple fixed scrapers 382 are provided and correspond to and contact the magnetic roller 33. Each fixed scraper 382 is fixedly connected to the barrier 383. To prevent each fixed scraper 382 from blocking the falling iron, the fixed scrapers 382 can be tilted.

[0028] During the rotation of the magnetic roller 33, the magnetic roller 33 carries the adsorbed iron past the position of the fixed scraper 382. The magnetic roller 33 scrapes off the adsorbed iron by sliding its surface relative to the fixed scraper 382, ​​so that the iron can fall into the recycling box 381 for centralized recycling and processing.

[0029] In other specific implementations, to further loosen and separate the iron from the aluminum scrap projected toward the impact baffle 36 for subsequent magnetic separation and screening, the movement of the scrap can be intensified, referring to... Figures 4 to 6 As shown, the magnetic screening mechanism 3 also includes a mounting bracket 31 and a drive mechanism 37 for driving the impact baffle 36 to reciprocate laterally. The mounting bracket 31 can be composed of a support column and a shield. The rotating impeller 32 and the magnetic roller 33 can be rotatably connected to the corresponding positions of the mounting bracket 31 via a rotating shaft. The mounting bracket 31 itself forms a shielding space to prevent aluminum scrap from splashing to the outside when the rotating impeller 32 throws it. The iron recovery mechanism 38 can be fixedly connected to the mounting bracket 31. The hammer crusher 2 can be directly fixedly installed on the top of the mounting bracket 31. The impact baffle 36 is slidably fitted on the mounting bracket 31, and the sliding trajectory line of the impact baffle 36 is parallel to the central axis of the rotating impeller 32.

[0030] Among them, reference Figures 6 to 8As shown, the drive mechanism 37 includes a transmission gear set, a cam 377, and a connecting slide 372; the rotating impeller 32 drives the cam 377 to rotate through the transmission gear set; the connecting slide 372 is fixedly connected to the impact baffle 36; two sets of connecting slides 372 can be provided, symmetrically fixedly distributed on both sides of the impact baffle 36; the connecting slide 372 is a U-shaped frame type; the connecting slide 372 slides through the mounting bracket 31, and a compressible and tensile connecting spring 373 is connected between the connecting slide 372 and the mounting bracket 31; the cam 377 is configured to cooperate with the connecting slide 372.

[0031] In a further embodiment, the transmission gear set includes a first steering helical gear 374, a second steering helical gear 375, and a linkage gear 376. The first steering helical gear 374 is rotatably connected to the outside of the mounting bracket 31 via a shaft bracket. Both the first steering helical gear 374 and the rotating impeller 32 are coaxially connected to second synchronous pulleys, and a second synchronous belt 371 is connected between the two second synchronous pulleys. The second steering helical gear 375 meshes with one side of the first steering helical gear 374, and the second steering helical gear 375 is also rotatably mounted on the mounting bracket 31 via a shaft bracket. On the outside; the cam 377 is also rotatably mounted on the outside of the mounting bracket 31 via the shaft bracket; the second steering helical gear 375 drives the cam 377 to rotate via the linkage gear 376. It should be noted that multiple linkage gears 376 can be provided here. Specifically, a large linkage gear 376 can be coaxially connected to the second steering helical gear 375, and multiple small linkage gears 376 continuously mesh on one side of the large linkage gear 376, and the small linkage gear 376 at the tail position is coaxially fixedly connected to the cam 377, thereby facilitating the cam 377 to rotate at a faster speed.

[0032] When the rotating impeller 32 rotates, it drives the first steering helical gear 374 to rotate through the second synchronous belt 371 and the second synchronous pulley. The first steering helical gear 374 then drives the linkage gear 376 to rotate through the second steering helical gear 375. The linkage gear 376 drives the cam 377 to rotate. During the rotation of the cam 377, it continuously squeezes the connecting slide 372 through the protruding end. Each time the connecting slide 372 is squeezed, it drives the impact baffle 36 to slide laterally to one side. During this process, the connecting slide 372 compresses the connecting spring 373, which generates a rebound force. When the cam 377 rotates and disengages from the connecting slide 372, the connecting slide 372 returns to the connecting spring 373. 3. Under the action of the rebound force, the impact baffle 36 slides back and resets. This process is repeated so that the impact baffle 36 can not only withstand the aluminum scrap thrown by the rotating impeller 32, but also move laterally. Since the lateral movement trajectory of the impact baffle 36 is parallel to the central axis of the rotating impeller 32, the aluminum scrap will pause or slide briefly on the surface of the impact baffle 36 after impact. At this time, the lateral movement of the impact baffle 36 will cause the aluminum scrap to be subjected to horizontal shear force and vertical impact force, forming an orthogonal force. This means that the aluminum scrap thrown and impacting the impact baffle 36 is subjected to three-dimensional force, which helps to intensify the movement of the scrap and thus improve the forced separation effect of iron embedded or wrapped in aluminum, making it easier to be magnetically screened laterally.

[0033] In some specific implementations, in order to facilitate the effective contact of the aluminum scraps with the impact baffle 36 during the lateral reciprocating motion, multiple protrusions 361 can be evenly distributed on the surface of the impact baffle 36. The shape of the protrusions 361 can be spherical or conical.

[0034] In addition, since the impact of debris will cause wear, the impact baffle 36 may include a connecting plate and a removable liner to facilitate replacement. The removable liner is connected to the connecting plate by screws, and the connecting plate is directly connected to the mounting bracket 31. In this way, replacement and maintenance can be carried out through the removable liner.

[0035] In some other specific implementations, in order to ensure that most of the aluminum scraps that hit the impact baffle 36 and scatter can effectively fall onto the magnetic roller 33, an inclined guide plate 39 is provided on the side of the impact baffle 36 near the rotating impeller 32, and the inclined guide plate 39 is positioned above the magnetic roller 33. The inclined guide plate 39 and the impact baffle 36 maintain a certain distance, and there is no motion interference with the rotating impeller 32. When the scraps that hit the impact baffle 36 bounce off and fall, they can be caught by the inclined guide plate 39 and guided onto the magnetic roller 33.

[0036] In some specific implementations, in order to facilitate the rotating impeller 32 in catching the falling aluminum scraps and driving its operation, the rotating impeller 32 includes a central shaft and blade plates 321. Multiple blade plates 321 are provided and are fixedly connected to the central shaft at equal intervals around the circumference. The central shaft can be rotatably connected to the mounting bracket 31. The blade plates 321 can be of a spoon-shaped structure to facilitate catching the falling scraps and projecting them.

[0037] Additionally, it should be noted that to ensure that as much of the debris falling between the blade plates 321 is thrown towards the impact baffle 36 by centrifugal force, the size of the central rotating shaft can be set to be relatively large, while the size of the blade plates 321 can be set to be relatively small. This reduces the amount of debris that can be temporarily stored between adjacent blade plates 321 at a time, thus ensuring effective ejection of debris at higher speeds. Of course, some debris may not be ejected and may fall directly onto the main conveyor belt mechanism 5 as the rotating impeller 32 rotates to the bottom. Even so, as the rotating impeller 32 rotates at high speed, the debris between the blade plates 321 will tumble. In this case, protrusions can be installed on the surface of the blade plates 321 to facilitate impact and loosen the ferrous material, allowing for subsequent iron removal by a strong magnetic separator installed on the main conveyor belt mechanism 5.

[0038] To facilitate understanding of the embodiments of this solution by those skilled in the art, the working principle of this solution will now be briefly explained in conjunction with specific application scenarios: First, the large pieces of aluminum waste are coarsely crushed by the twin-shaft shredder 1. The coarsely crushed aluminum waste is then transported to the hammer crusher 2 by the transfer conveyor belt mechanism 4. The hammer crusher 2 further crushes the coarsely crushed aluminum waste to obtain finer waste.

[0039] The aluminum scrap after further crushing by the hammer crusher 2 is discharged from the discharge port 21 and falls onto the rotating impeller 32. The rotating impeller 32 rotates at high speed and catches the falling aluminum scrap by relying on the space between the adjacent blades 321 and drives the scrap to rotate. During this process, the aluminum scrap will tumble, and the rotating impeller 32 generates centrifugal force through rotation to throw the aluminum scrap towards the impact baffle 36. After the aluminum scrap hits the impact baffle 36, the scrap disperses, which facilitates the loosening of some iron embedded in or covered by aluminum that is not easy to separate under the action of inertia and collision.

[0040] Furthermore, when the rotating impeller 32 rotates, it drives the first steering helical gear 374 to rotate through the second synchronous belt 371 and the second synchronous pulley. The first steering helical gear 374 then drives the linkage gear 376 to rotate through the second steering helical gear 375. The linkage gear 376 then drives the cam 377 to rotate. During the rotation of the cam 377, it continuously squeezes the connecting slide 372 through the protruding end. Each time the connecting slide 372 is squeezed, it drives the impact baffle 36 to slide laterally to one side. During this process, the connecting slide 372 compresses the connecting spring 373, which generates a rebound force. When the cam 377 rotates and disengages from the connecting slide 372, the connecting slide 372 is then released from the connecting spring 373. 73. Under the action of the rebound force, the material slides back, thereby causing the impact baffle 36 to slide back and reset. This process is repeated, so that the impact baffle 36 can not only withstand the aluminum scrap thrown by the rotating impeller 32, but also move laterally back and forth. Since the lateral movement trajectory of the impact baffle 36 is parallel to the central axis of the rotating impeller 32, the aluminum scrap will pause or slide briefly on the surface of the impact baffle 36 after impact. At this time, the lateral movement of the impact baffle 36 will cause the aluminum scrap to be subjected to horizontal shear force and vertical impact force, forming an orthogonal force. This means that the aluminum scrap thrown and impacting the impact baffle 36 is subjected to three-dimensional force, which helps to intensify the movement of the scrap and thus improve the forced separation effect of iron embedded or wrapped in aluminum, making it easier to be magnetically screened laterally.

[0041] The aluminum scraps that impact the impact baffle 36 will fall onto the magnetic rollers 33 distributed below. The magnetic rollers 33 use magnetic force to attract loose or separated iron materials from the passing aluminum scraps, improving the iron removal effect. Furthermore, the magnetic rollers 33 are distributed in a stepped manner, which allows the aluminum scraps to bounce off the impact baffle 36 and fall back down, and also allows for a longer contact time between the aluminum scraps sliding down the impact baffle 36 and the distributed magnetic rollers 33, thereby improving the iron removal effect.

[0042] During the rotation of the magnetic roller 33, the magnetic roller 33 carries the adsorbed iron past the position of the fixed scraper 382. The magnetic roller 33 scrapes off the adsorbed iron by sliding its surface relative to the fixed scraper 382, ​​so that the iron can fall into the recycling box 381 for centralized recycling and processing.

[0043] After passing through the magnetic roller 33 screen for iron, the falling aluminum material is conveyed to the next process via the main conveyor belt mechanism 5. Above the conveying path of the main conveyor belt mechanism 5, a strong magnetic separator can be used to further remove any remaining iron material that may be present in the conveyed aluminum scrap, ensuring high purity of the subsequent aluminum scrap and facilitating recycling.

[0044] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A crushing and screening device for aluminum waste recycling, comprising a crusher assembly and a magnetic screening mechanism (3); characterized in that, The magnetic screening mechanism (3) includes a rotating impeller (32), an impact baffle (36), and a magnetic roller (33). The rotating impeller (32) is used to catch the aluminum scrap discharged from the crusher assembly and generate centrifugal force by rotating to throw the aluminum scrap toward the impact baffle (36); the magnetic roller (33) is arranged on the lower side of the impact baffle (36).

2. The crushing and screening equipment for aluminum waste recycling according to claim 1, characterized in that, Multiple magnetic rollers (33) are provided and are arranged in a stepped manner, and all of the magnetic rollers (33) rotate synchronously.

3. The crushing and screening equipment for aluminum waste recycling according to claim 2, characterized in that, The magnetic screening mechanism (3) further includes an iron recycling mechanism (38), which includes a recycling bottom box (381) and a fixed scraper (382). The recycling bottom box (381) is located on the lower side of the magnetic roller (33). A barrier (383) is fixedly connected above the recycling bottom box (381). Multiple fixed scrapers (382) are provided and are in contact with the magnetic roller (33). Each fixed scraper (382) is fixedly connected to the barrier (383).

4. The crushing and screening equipment for aluminum waste recycling according to claim 1, characterized in that, The magnetic screening mechanism (3) further includes a mounting bracket (31) and a drive mechanism (37) for driving the impact baffle (36) to reciprocate laterally; the impact baffle (36) is slidably mounted on the mounting bracket (31), and the sliding trajectory line of the impact baffle (36) is parallel to the central axis of the rotating impeller (32).

5. The crushing and screening equipment for aluminum waste recycling according to claim 4, characterized in that, The drive mechanism (37) includes a transmission gear set, a cam (377) and a connecting slide (372); the rotating impeller (32) drives the cam (377) to rotate through the transmission gear set, and the connecting slide (372) is fixedly connected to the impact baffle (36); the connecting slide (372) slides through the mounting bracket (31), and a connecting spring (373) is connected between the connecting slide (372) and the mounting bracket (31), and the cam (377) is configured to cooperate with the connecting slide (372).

6. The crushing and screening equipment for aluminum waste recycling according to claim 5, characterized in that, The transmission gear set includes a first steering helical gear (374), a second steering helical gear (375), and a linkage gear (376); the first steering helical gear (374), the second steering helical gear (375), the linkage gear (376), and the cam (377) are all rotatably connected to the outside of the mounting bracket (31); the first steering helical gear (374) and the rotating impeller (32) are coaxially connected to a second synchronous pulley, and a second synchronous belt (371) is connected between the two second synchronous pulleys; the second steering helical gear (375) meshes with one side of the first steering helical gear (374); the second steering helical gear (375) drives the cam (377) to rotate through the linkage gear (376).

7. The crushing and screening equipment for aluminum waste recycling according to claim 4, characterized in that, The impact baffle (36) has a plurality of protruding structures (361) evenly distributed on its surface.

8. The crushing and screening equipment for aluminum waste recycling according to claim 1, characterized in that, The impact baffle (36) includes a removable liner.

9. The crushing and screening equipment for aluminum waste recycling according to claim 1, characterized in that, The impact baffle (36) is provided with an inclined guide plate (39) on the side near the rotating impeller (32), and the inclined guide plate (39) is positioned above the magnetic roller (33).

10. The crushing and screening equipment for aluminum waste recycling according to claim 1, characterized in that, The rotating impeller (32) includes a central shaft and blade plates (321). Multiple blade plates (321) are provided and are fixedly connected to the central shaft at equal intervals in the circumferential direction.

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