A crushing and magnetic separation device for scrap metal recycling

Abstract

The application relates to the technical field of sorting equipment, and discloses a crushing and magnetic separation device for waste metal recovery, which comprises a rack, a main driving roller and a driven tensioning roller rotatably installed at the two ends of the rack, a conveying belt tensioned between the main driving roller and the driven tensioning roller, a motor installed on the rack, a guide plate and a material recovery box fixedly installed on the rack and corresponding to the discharge end of the conveying belt, a first magnet embeddedly installed in the driven tensioning roller, a plurality of vertical sliding rails correspondingly arranged on the side walls of the rack, a second magnet fixedly installed between the vertical sliding rails on the two sides, and a driving mechanism for adjusting the vertical distance between the second magnet and the bearing surface of the conveying belt. The second magnet driven by the power of the conveying belt and capable of periodically ascending and descending forms a magnetic field peristaltic wave above the material, strongly absorbs the metal particles in the middle and upper layers, significantly reduces the entrainment loss caused by the shielding effect, and greatly improves the overall recovery rate.

Description

Technical Field

[0001] This invention relates to the field of sorting equipment technology, specifically to a crushing and magnetic separation device for recycling waste metals. Background Technology

[0002] Efficient recycling of scrap metal is a key link in the circular economy and resource regeneration. In the treatment of solid waste such as scrapped cars, waste home appliances, and industrial scraps, magnetic separation is the core technology for separating ferromagnetic metals. Its effectiveness directly determines the metal recovery rate, purity, and the cost and energy consumption of subsequent processing.

[0003] Currently, the magnetic separation devices widely used in industrial production mostly employ a structure in which a fixed permanent magnet or electromagnet is installed above or at the end of the conveyor belt. Their typical working principle is as follows: the crushed mixture is placed on the conveyor belt, and when it passes through the magnetic field area, the ferromagnetic metals are adsorbed and separated.

[0004] However, the crushed material is usually fed in a concentrated manner at once, forming a relatively thick layer on the conveyor belt. While the ferromagnetic particles in the lower layer can be effectively attracted, the particles in the middle and upper layers, due to their greater distance from the magnet, experience a sharp decrease in magnetic force with the square of the distance. More importantly, the upper layer of material creates a "shielding effect" on the lower particles, further weakening the effective magnetic field strength. This results in a significant portion of the ferrous metal not being attracted and instead mixing into the non-metallic tailings, causing "entrainment" losses and making it difficult to improve the overall recovery rate. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a crushing and magnetic separation device for recycling waste metals.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A crushing and magnetic separation device for recycling waste metal includes a frame, with a main drive roller and a driven tension roller rotatably mounted at both ends of the frame. A conveyor belt is tensioned between the main drive roller and the driven tension roller. A motor is mounted on the frame, and the output end of the motor is connected to the main drive roller via a coupling. A guide plate is fixedly mounted on the frame corresponding to the discharge end of the conveyor belt, and a material recycling box is mounted on the guide plate. A first magnet is embedded inside the driven tension roller. Multiple vertical slide rails are correspondingly arranged on the two side walls of the frame, and a second magnet is fixedly mounted between the vertical slide rails on both sides. The device also includes a drive mechanism for driving the vertical slide rails to move up and down to adjust the vertical distance between the second magnet and the conveyor belt bearing surface.

[0007] To prevent the conveyor belt from running off-track, preferably, both the main drive roller and the driven tension roller have annular grooves on their outer surfaces, and the inner working surface of the conveyor belt has a raised limiting band that matches the annular grooves.

[0008] In order to guide the second magnet to perform vertical lifting and lowering motion and convert sliding friction into rolling friction to improve transmission efficiency and lifespan, the vertical slide rail further includes a fixed seat fixedly installed on the inner wall of the frame, a special-shaped rod slidably installed in the fixed seat, and at least one roller fixedly installed on the special-shaped rod.

[0009] In order to utilize the conveyor belt's own power to drive the second magnet to periodically rise and fall, thereby creating a dynamic sorting effect, the driving mechanism further includes a horizontal shaft passing through the conveyor belt. Cam arms with identical structures are fixedly installed at both ends of the horizontal shaft. The outer contour of the cam arm is an arc curve, and a guide groove extending along this contour is formed on it. The roller is rolled and engaged within the guide groove. A gear is fixedly installed on the horizontal shaft, and toothed grooves that match the gear are equidistantly formed on the raised limiting band.

[0010] In order to form an alternating magnetic field creeping wave in the conveying direction, so that the ferromagnetic particles undergo an adsorption-release-re-adsorption cycle, further, the two adjacent sets of cam arms are misaligned in the circumferential direction of the horizontal axis, so that when the horizontal axis rotates, the highest point on the profile of one set of cam arms and the lowest point on the profile of the adjacent set of cam arms alternately act on the corresponding rollers during the rotation cycle of the horizontal axis.

[0011] To achieve automatic cleaning of the conveyor belt return path and related equipment areas, and to prevent material accumulation and adhesion, at least one crossbeam is fixedly installed on the frame. A push rod slides through the crossbeam, and a scraper is installed at one end of the push rod, which is located above the material recovery box. A first wedge block is fixedly installed at the other end of the push rod. A second wedge block is fixedly installed on the irregular rod of any of the vertical slide rails. The inclined surface of the second wedge block matches and maintains contact with the inclined surface of the first wedge block. A first spring is fixedly connected between the shoulder of the push rod and the side wall of the crossbeam.

[0012] In order to guide the scraped material to fall in a concentrated manner, prevent splashing, and keep the work area clean, the scraper is further provided with a guide groove.

[0013] In order to enable the scraper to have an elastic buffer function and effectively avoid hard obstacles, preventing the mechanism from jamming or being damaged, the scraper is further provided with a sliding groove, a slider is fixedly installed on the push rod, the slider is installed in the sliding groove, and a second spring is fixedly connected between the slider and the inner wall of the sliding groove.

[0014] To achieve adjustment of conveyor belt tension and enhance scraper cleaning contact, preferably, the magnetic separator further includes an adjusting roller, which is rotatably mounted on the frame and located downstream of the material recovery box; the frame is provided with adjusting grooves at both ends corresponding to the adjusting roller, and the two ends of the adjusting roller's shaft are mounted in the adjusting grooves through bearing seats, and can be locked at different positions in the adjusting grooves by fasteners.

[0015] In order to integrate the crushing pretreatment and magnetic separation functions into one unit and realize continuous automated crushing and separation operation, preferably, the frame is provided with a crushing mechanism for crushing waste metal powder. The crushing mechanism includes a crushing box and two crushing rollers rotatably connected inside the crushing box. A gear II is provided on the side of the crushing box and fixedly connected to the two crushing rollers, and the central shaft of one of the gear II is connected to the output shaft of the motor through belt drive.

[0016] The beneficial effects of this invention are: 1. A second magnet, driven by the conveyor belt itself and capable of periodic lifting and lowering, forms a magnetic field creeping wave above the material. When the magnet rises, the strong magnetic field can penetrate the thick material layer and forcefully pull out the metal particles in the middle and upper layers, significantly reducing the entrainment loss caused by the shielding effect and greatly improving the overall recovery rate. When the magnet descends, the magnetic force decreases sharply, causing the adsorbed metal particles to undergo a brief release and re-adsorption process. The inertial difference is used to effectively shake off the adhering non-metallic impurities, realizing online real-time purification of the metal material, significantly improving the purity of the product, and reducing the cost and energy consumption of subsequent secondary processing.

[0017] 2. By meshing the inner tooth groove of the conveyor belt with gear one, the main conveying power is synchronously transmitted to the cam arm, thereby driving the second magnet to rise and fall, and further driving the scraper through the wedge block mechanism. The entire sorting intensity adjustment and cleaning function does not require an additional motor, and the operation is reliable and the maintenance cost is low. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a second perspective view of the overall structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the internal structure of the frame of the present invention; Figure 4 This is a schematic diagram of the cooperation structure between the vertical slide rail and the drive mechanism of the present invention; Figure 5 This is a schematic diagram of the cooperation structure between the scraper and the shaped rod of the present invention; Figure 6 This is a schematic diagram of the driven tension roller structure of the present invention; Figure 7This is a schematic diagram of the scraper structure of the present invention; Figure 8 for Figure 3 Enlarged view of the A-structure.

[0019] The attached diagram lists the components represented by each number as follows: 10. Frame; 11. Main drive roller; 12. Driven tension roller; 13. Conveyor belt; 131. Raised limiting belt; 132. Toothed groove; 14. Guide plate; 15. First magnet; 16. Motor; 17. Crossbeam; 18. Push rod; 181. First wedge block; 182. First spring; 183. Slider; 19. Adjusting roller; 101. Annular groove; 102. Adjusting groove; 20. Material recycling bin; 30. Vertical slide rail; 31. Fixed base; 32. Irregular rod; 321. Second wedge block; 33. Roller; 40. The second magnet; 50. Drive mechanism; 51. Horizontal shaft; 52. Cam arm; 521. Guide groove; 53. Gear 1; 60. Scraper; 61. Guide channel; 62. Slide groove; 63. Second spring; 70. Crushing mechanism; 71. Crushing box; 72. Crushing roller; 73. Gear II. Detailed Implementation

[0020] 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 some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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 this invention. Example 1

[0022] like Figure 1 - Figure 8As shown, this invention relates to a crushing and magnetic separation device for recycling waste metals, including a frame 10 with feet at the bottom to ensure stable and horizontal installation. A main drive roller 11 and a driven tension roller 12 are rotatably mounted at both ends of the frame 10, respectively. A conveyor belt 13 is tensioned between the main drive roller 11 and the driven tension roller 12, forming a horizontal conveying platform. A motor 16 is mounted on the frame 10, and the output end of the motor 16 is connected to the main drive roller 11 via a coupling, thereby driving the conveyor belt 13. Furthermore, the surface of the conveyor belt 13 may have shallow edges or textures to prevent material slippage. A first magnet 15 is embedded inside the driven tension roller 12, thus forming a circumferential magnetic field. When the conveyor belt 13 passes over this roller, non-magnetic materials fall tangentially under gravity, while ferromagnetic materials adsorbed on the belt surface must continue moving with the conveyor belt 13 until they leave the magnetic field range of the magnetic roller before they can fall off.

[0023] A guide plate 14 is fixedly installed on the frame 10 at the discharge end of the conveyor belt 13. A material recycling box 20 is installed on the guide plate 14 for collecting magnetic materials.

[0024] Multiple vertical slide rails 30 are provided on the two side walls of the frame 10. A second magnet 40 is fixedly installed between the vertical slide rails 30 on both sides. In this embodiment, the number of vertical slide rails 30 on the same side is preferably 2-3. The number of second magnets 40 is the same as the number of vertical slide rails 30. The frame 10 also includes a drive mechanism 50 for driving the vertical slide rails 30 to move up and down to adjust the vertical distance between the second magnets 40 and the bearing surface of the conveyor belt 13.

[0025] When the mixed material is fed to the feed end of the running conveyor belt 13, the first magnetic separation occurs when the conveyor belt 13 carrying the material runs above the second magnet 40. This generates a magnetic force on the metal particles located in the middle and upper layers, pulling them out of the material layer and reducing the entrainment loss caused by the shielding effect.

[0026] Reference Figure 1 and Figure 2 and Figure 6 Both the main drive roller 11 and the driven tension roller 12 are provided with annular grooves 101 on their outer circular surfaces. Preferably, there are two annular grooves 101. The inner working surface of the conveyor belt 13 is provided with a raised limiting band 131 that matches the annular grooves 101, forming an efficient "track" system. It can constrain the lateral movement of the conveyor belt 13 and prevent the conveyor belt 13 from running off-track even under uneven load or long-term operation.

[0027] Reference Figure 4The vertical slide rail 30 includes a fixed seat 31 fixedly installed on the inner wall of the frame 10. A special-shaped rod 32 is slidably installed in the fixed seat 31 to ensure that the lifting path of the second magnet 40 is vertical and without shaking. At least one roller 33 is fixedly installed on the special-shaped rod 32. In this embodiment, the number of rollers 33 is preferably two, and they are key force transmission components. They transform the vertical sliding of the special-shaped rod 32 and the second magnet 40 into rolling contact with the subsequent drive mechanism 50, thereby reducing frictional resistance and wear.

[0028] The drive mechanism 50 includes a horizontal shaft 51 that passes through the conveyor belt 13. Both ends of the horizontal shaft 51 are rotatably connected to the fixed seat 31, and cam arms 52 with the same structure are fixedly installed at both ends of the shaft. The cross-section of the cam arm 52 is an equilateral triangle, and the outer contour of the cam arm 52 is an arc curve. A guide groove 521 extending along the contour is provided on it, and the roller 33 is rolled and engaged in the guide groove 521.

[0029] The power of the horizontal shaft 51 does not come from the independent motor 16, but from the gear 53 fixedly installed on the horizontal shaft 51. The raised limiting belt 131 has toothed grooves 132 that are adapted to the gear 53 at equal intervals. As long as the conveyor belt 13 runs, the horizontal shaft 51 will rotate synchronously.

[0030] Furthermore, the two adjacent sets of cam arms 52 are installed in a staggered manner in the circumferential direction of the horizontal shaft 51, so that when the horizontal shaft 51 rotates, the highest point on the profile of one set of cam arms 52 and the lowest point on the profile of the adjacent set of cam arms 52 alternately act on the corresponding roller 33 within the rotation cycle of the horizontal shaft 51.

[0031] The material is evenly spread on the conveyor belt 13. The conveyor belt 13 achieves stable operation without deviation by cooperating with the annular groove 101 of the roller through the inner protruding limiting band 131. When the conveyor belt 13 runs, the toothed groove 132 on its inner side drives the gear 53, which drives the horizontal shaft 51 and the cam arm 52 on it to rotate synchronously. The rotating cam arm 52 acts on the roller 33 on the vertical slide rail 30 through the guide groove 521 of its arc profile, thereby driving the second magnet 40 to make regular lifting and lowering movements.

[0032] Because the adjacent cam arms 52 are misaligned around the horizontal shaft 51, the lifting and lowering movements of the second magnets 40 at different stations in the conveying direction have an alternating phase difference. This essentially creates a magnetic field creeping wave with alternating peaks and troughs above the material. When the magnetic field "peak" (the magnet rises and the spacing decreases) passes through, the high-intensity magnetic field can penetrate a thicker material layer and strongly attract the ferromagnetic particles located in the middle and upper layers, effectively reducing the metal loss caused by the "shielding effect".

[0033] When the magnetic field reaches a "trough" (when the magnet descends and the distance between them increases), the magnetic force decreases sharply, giving the adsorbed iron particles a brief window to release and fall. At this moment, non-magnetic impurities trapped due to physical adhesion are more likely to detach from the metal particles due to differences in inertia and lack of magnetic restraint. Subsequently, the magnetic field at the next "peak" will capture the falling metal particles again. This cycle of adsorption-shaking release-re-adsorption is equivalent to continuous mechanical purification of the iron metal, significantly improving the purity of the recovered metal and reducing the cost and energy consumption of subsequent secondary processing.

[0034] After repeated action of the "magnetic field creeping wave", the metal particles and non-metallic slag are separated. The metal particles fall into the material recovery box 20 after detaching at the end of the magnetic field, and the non-metallic slag is guided to the designated position by the guide plate 14. Example 2

[0035] Reference Figure 2 and Figure 5 At least one crossbeam 17 is fixedly installed on the frame 10 to increase the stability of the frame 10. The number of crossbeams 17 is preferably 2-3. A push rod 18 is slidably inserted inside the crossbeam 17. The extension direction of the push rod 18 is consistent with that of the conveyor belt 13, but the moving direction is perpendicular to the moving direction of the conveyor belt 13 in spatial distribution. A first spring 182 is fixedly connected between the shoulder of the push rod 18 and the side wall of the crossbeam 17. The preload of the first spring 182 causes the push rod 18 to have a tendency to move outward of the frame 10. A scraper 60 is installed at one end of the push rod 18, and the scraper 60 is located above the material recycling box 20. A first wedge block 181 is fixedly installed at the other end of the push rod 18. A second wedge block 321 is fixedly installed on the irregular rod 32 of any vertical slide rail mechanism 30. The inclined surface of the second wedge block 321 matches and maintains contact with the inclined surface of the first wedge block 181, so as to efficiently convert the vertical movement of the irregular rod 32 into the horizontal reciprocating movement of the push rod 18.

[0036] Furthermore, the scraper 60 is provided with a guide groove 61, which is preferably V-shaped, to guide the material to fall along a predetermined path and prevent splashing and accumulation.

[0037] Reference Figure 7 Furthermore, a groove 62 is provided on the scraper 60, and a slider 183 is fixedly installed on the push rod 18. The slider 183 is installed in the groove 62, and a second spring 63 is fixedly connected between the slider 183 and the inner wall of the groove 62.

[0038] As described in Embodiment 1, the conveyor belt 13 operates via gear 53 and tooth groove 132, driving the horizontal shaft 51 and cam arm 52 to rotate, which in turn drives the irregular rod 32 of the vertical slide rail 30 to perform periodic lifting and lowering movements. The second wedge block 321 fixed on the irregular rod 32 moves up and down accordingly. When it moves downward, its inclined surface presses against the inclined surface of the first wedge block 181 in contact with it. The pressing action of the inclined surface overcomes the tension of the first spring 182, pushing the push rod 18 horizontally towards the inside of the frame 10. Conversely, when the second wedge block 321 moves upward, the pressure is released, and the rebound force of the first spring 182... When the push rod 18 is pulled back to its original position, the vertical lifting motion of the second magnet 40 is converted into the horizontal reciprocating motion of the scraper 60, thereby scraping the residual material on the surface of the return conveyor belt 13 into the material recycling box 20. During the movement, the guide groove 61 on the scraper 60 can effectively guide the more fluid fragments to fall along the groove. If the scraper 60 encounters an immovable hard obstacle on the path, the slider 183 can compress the second spring 63 in the slide groove 62, causing the scraper 60 to float. The main body of the push rod 18 and the transmission mechanism will not bear excessive rigid resistance, preventing damage to the mechanism. Example 3

[0039] Reference Figure 1 and Figure 2 The magnetic separator also includes an adjusting roller 19, which is rotatably mounted on the frame 10 and located downstream of the material recovery box 20, i.e. behind the material flow direction.

[0040] The frame 10 has elongated adjustment grooves 102 at both ends corresponding to the adjustment roller 19. The two ends of the rotating shaft of the adjustment roller 19 are installed in the adjustment grooves 102 through bearing seats, allowing the bearing seats to slide in the vertical direction and to be locked in different positions in the adjustment grooves 102 by fasteners, preferably bolts.

[0041] By changing the position of the adjusting roller 19 on the frame 10, the wrap angle and stroke of the conveyor belt 13 are adjusted, thereby adjusting the tension of the conveyor belt 13. At the same time, the contact between the conveyor belt 13 and the scraper 60 is increased, enhancing the scraping and cleaning effect. Example 4

[0042] Reference Figure 1 and Figure 2 The frame 10 is provided with a crushing mechanism 70 for crushing waste metal powder. The crushing mechanism 70 includes a crushing box 71 and two crushing rollers 72 rotatably connected inside the crushing box 71. A gear 73 is provided on the side of the crushing box 71 and is fixedly connected to the two crushing rollers 72. The central shaft of one of the gears 73 is connected to the output shaft of the motor 16 via a belt drive.

[0043] Large or large-sized scrap metal mixtures are fed into the feed port at the top of the crushing box 71. The motor 16 drives the active crushing roller 72 to rotate via a belt, and drives the driven crushing roller 72 to rotate synchronously in opposite directions via meshing gears 73. The interlaced blades on the two rollers form a powerful shearing and tearing force, crushing the large pieces of material into smaller and more uniform fragments.

[0044] Under the influence of gravity, the crushed material falls directly and evenly from the discharge port at the bottom of the crushing box 71 onto the conveyor belt 13 running below, completing a seamless connection from pretreatment to sorting.

[0045] Working principle: Large pieces of scrap metal are fed into the feed port of the crushing mechanism 70. A pair of meshing crushing rollers 72 driven by the same motor 16 via belt rotate in opposite directions to shear the material into uniformly sized fragments, achieving the initial separation of metal and non-metal.

[0046] The crushed material falls directly onto the conveyor belt 13 running at a constant speed below. The conveyor belt 13, through the inner protruding limiting band 131, cooperates with the annular groove 101 of the main drive roller 11 and the driven tension roller 12 to form a "track-like" operation, ensuring that there is no deviation during the conveying process.

[0047] The material first runs to the top of the second magnet 40. The movement of the conveyor belt 13 drives the gear 53 through the toothed groove 132 on its inner side, which drives the horizontal shaft 51 and the cam arm 52 fixed on it and whose phases are offset to rotate synchronously. The rotating cam arm 52 acts on the roller 33 on the vertical slide rail 30 through the guide groove 521 of its arc profile, thereby driving the second magnet 40 to make regular lifting and lowering movements.

[0048] Because the adjacent cam arms 52 are misaligned around the horizontal shaft 51, the lifting and lowering movements of the second magnets 40 at different stations in the conveying direction have an alternating phase difference. This essentially creates a magnetic field creeping wave with alternating peaks and troughs above the material. When the magnetic field "peak" magnet rises and the spacing decreases as it passes through, the high-intensity magnetic field can penetrate a thicker material layer and strongly attract the ferromagnetic particles located in the middle and upper layers, effectively reducing metal loss caused by the "shielding effect".

[0049] When the magnet descends at the "trough" of the magnetic field and the distance between them increases, the magnetic force decreases sharply. The adsorbed iron particles gain a brief window for release and fall. At this moment, non-magnetic impurities that are physically bound together are more likely to detach from the metal particles due to differences in inertia and lack of magnetic restraint. Subsequently, the magnetic field at the next "peak" will capture the falling metal particles again. This cycle of adsorption-shaking release-re-adsorption is equivalent to continuous mechanical purification of the iron metal, which significantly improves the purity of the recovered metal and reduces the cost and energy consumption of subsequent secondary processing.

[0050] The periodic lifting motion of the vertical slide rail 30 is converted into the horizontal reciprocating motion of the push rod 18 through the engagement of the second wedge block 321 fixed thereon with the inclined surface of the first wedge block 181 mounted on the crossbeam 17. The scraper 60 at the front end of the push rod 18 reciprocates accordingly, automatically scraping residual material from the surface of the return conveyor belt 13 and the equipment into the material recovery box 20. The guide groove 61 on the scraper 60 guides the material to fall in a concentrated manner, and its elastic connection to the second spring 63 is designed to prevent jamming, ensuring reliable and gentle cleaning operation.

[0051] The downstream adjusting roller 19 can change its installation height through the adjusting groove 102 to prevent the belt from loosening and slipping, while increasing its contact area and pressure with the scraper 60.

[0052] After undergoing the above process, the metal particles detach at the end of the magnetic field and fall into the material recycling bin 20 along an optimized trajectory; non-metallic impurities are separated at the driven tension roller 12 and guided by the guide plate 14 into the non-metallic hopper, completing high-purity and high-efficiency automatic sorting.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A crushing and magnetic separation device for recycling scrap metal, comprising a frame (10), characterized in that, The frame (10) has a main drive roller (11) and a driven tension roller (12) rotatably mounted at both ends. A conveyor belt (13) is tensioned between the main drive roller (11) and the driven tension roller (12). A motor (16) is mounted on the frame (10). The output end of the motor (16) is connected to the main drive roller (11) via a coupling. A guide plate (14) is fixedly mounted on the frame (10) at the discharge end of the conveyor belt (13). A material recycling box (20) is mounted on the guide plate (14). A first magnet (15) is embedded inside the driven tension roller (12); The frame (10) has multiple vertical slide rails (30) on its two side walls. A second magnet (40) is fixedly installed between the two vertical slide rails (30). The frame also includes a drive mechanism (50) for driving the vertical slide rails (30) to move up and down to adjust the vertical distance between the second magnet (40) and the bearing surface of the conveyor belt (13).

2. The crushing and magnetic separation device for recycling waste metals according to claim 1, characterized in that: The outer surfaces of the main drive roller (11) and the driven tension roller (12) are provided with annular grooves (101), and the inner working surface of the conveyor belt (13) is provided with a raised limiting band (131) that is compatible with the annular grooves (101).

3. The crushing and magnetic separation device for recycling waste metals according to claim 2, characterized in that: The vertical slide rail (30) includes a fixed seat (31) fixedly installed on the inner wall of the frame (10), a special-shaped rod (32) is slidably installed in the fixed seat (31), and at least one roller (33) is fixedly installed on the special-shaped rod (32).

4. The crushing and magnetic separation device for recycling waste metals according to claim 3, characterized in that: The drive mechanism (50) includes a horizontal shaft (51) passing through the conveyor belt (13). Cam arms (52) with the same structure are fixedly installed at both ends of the horizontal shaft (51). The outer contour of the cam arm (52) is an arc curve, and a guide groove (521) extending along the contour is provided on it. The roller (33) is rolled and engaged in the guide groove (521); Among them, a gear (53) is fixedly installed on the horizontal shaft (51), and tooth grooves (132) that are adapted to the gear (53) are equally spaced on the protruding limiting band (131).

5. The crushing and magnetic separation device for recycling waste metals according to claim 4, characterized in that: The two adjacent sets of cam arms (52) are installed in a staggered manner in the circumferential direction of the horizontal shaft (51), such that when the horizontal shaft (51) rotates, the highest point on the profile of one set of cam arms (52) and the lowest point on the profile of the adjacent set of cam arms (52) alternately act on the corresponding roller (33) during the rotation cycle of the horizontal shaft (51).

6. The crushing and magnetic separation device for recycling waste metals according to claim 3, characterized in that: At least one crossbeam (17) is fixedly installed on the frame (10). A push rod (18) is slidably passed through the crossbeam (17). A scraper (60) is installed at one end of the push rod (18). The scraper (60) is located above the material recycling box (20). A first wedge block (181) is fixedly installed at the other end of the push rod (18). A second wedge block (321) is fixedly installed on the irregular rod (32) of any of the vertical slide rails (30). The inclined surface of the second wedge block (321) matches and maintains contact with the inclined surface of the first wedge block (181). A first spring (182) is fixedly connected between the shoulder of the push rod (18) and the side wall of the crossbeam (17).

7. The crushing and magnetic separation device for recycling waste metals according to claim 6, characterized in that: The scraper (60) is provided with a guide groove (61).

8. The crushing and magnetic separation device for recycling waste metals according to claim 6, characterized in that: The scraper (60) has a groove (62), and a slider (183) is fixedly installed on the push rod (18). The slider (183) is installed in the groove (62), and a second spring (63) is fixedly connected between the slider (183) and the inner wall of the groove (62).

9. A crushing and magnetic separation device for recycling waste metals according to claim 1, characterized in that: The magnetic separator also includes an adjusting roller (19), which is rotatably mounted on the frame (10) and located downstream of the material recycling bin (20); The frame (10) is provided with adjustment grooves (102) at both ends corresponding to the adjustment roller (19). The two ends of the rotating shaft of the adjustment roller (19) are installed in the adjustment groove (102) through bearing seats and can be locked in different positions in the adjustment groove (102) by fasteners.

10. A crushing and magnetic separation device for recycling waste metals according to claim 1, characterized in that: The frame (10) is provided with a crushing mechanism (70) for crushing waste metal powder. The crushing mechanism (70) includes a crushing box (71) and two crushing rollers (72) rotatably connected inside the crushing box (71). A gear (73) is provided on the side of the crushing box (71) and is fixedly connected to the two crushing rollers (72). The central shaft of one of the gears (73) is connected to the output shaft of the motor (16) via a belt drive.

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