Multistage pair roller type rare earth waste material crushing and recycling device

Abstract

This invention relates to the field of rare earth waste crushing technology, specifically a multi-stage roller-type rare earth waste crushing and recycling device. It includes a crushing box, a pretreatment box on top of the crushing box, a top cover on top of the pretreatment box, and an installation box mounted outside the crushing box. The device also includes a processing mechanism mounted on the pretreatment box, comprising a first motor mounted outside the pretreatment box, the output end of the first motor being fixedly connected to a connecting shaft through a coupling passing through the pretreatment box, blades evenly mounted on the outside of the connecting shaft, drying cylinders spaced apart between the blades, and a stirring rod mounted outside the drying cylinders; and an adjustment mechanism installed inside the crushing box. The first motor drives the blades to cut the rare earth waste, thereby initially crushing large pieces of waste. Simultaneously, in conjunction with drying nozzles and drying cylinders, the rare earth waste can be dried, thus pre-treating the crushing mechanism and improving the uniformity of rare earth recycling.

Description

Technical Field

[0001] This invention relates to the technical field, specifically to a multi-stage roller-type rare earth waste crushing and recycling device. Background Technology

[0002] As a non-renewable mineral resource, rare earth elements are becoming increasingly scarce globally due to over-exploitation in recent years. Major rare earth reserve holders like China are strengthening their protection of rare earth resources and the environment, leading to reduced mining and supply. The steadily rising price of rare earths has also significantly increased the production costs of downstream rare earth products. Furthermore, the emergence of large quantities of electronic waste containing rare earth elements has provided an opportunity for the development of the rare earth recycling industry. Against the backdrop of resource scarcity, rising costs, and continuous technological advancements, the rare earth recycling industry is gradually gaining importance in some countries.

[0003] To ensure the full utilization of natural resources and save production costs, it is necessary to recycle and refine rare earth waste. However, the recycled rare earth waste often contains a large amount of moisture, which makes it easy for the rare earth waste to be crushed unevenly during the crushing and recycling process. At the same time, the waste is also easy to stick to the surface of the crushing roller, affecting the crushing effect. Therefore, we propose a multi-stage roller-type rare earth waste crushing and recycling device. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-stage roller-type rare earth waste crushing and recycling device, which solves the problem of uneven crushing of existing rare earth waste, thus affecting rare earth recycling, by cooperating with processing components, crushing components and adjusting components.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A multi-stage roller-type rare earth waste crushing and recycling device includes a crushing box, a pretreatment box at the top of the crushing box, a first control valve penetrating the bottom of the pretreatment box, a top cover at the top of the pretreatment box, and an installation box with a door on the outside of the crushing box. The device also includes a processing mechanism mounted on the pretreatment box, comprising a first motor mounted outside the pretreatment box, the output end of which is fixedly connected to a connecting shaft through the pretreatment box via a coupling. Blades are evenly mounted on the outside of the connecting shaft, and drying cylinders are spaced apart between the blades. A stirring rod is installed on the outside of the drying cylinder; and an adjusting mechanism is installed inside the crushing box. The adjusting mechanism includes a fixed block installed on the mounting box, a sliding frame is opened inside the fixed block, a slider is slidably connected inside the sliding frame, an electric push rod is installed on the outside of the fixed block, the output end of the electric push rod is fixedly connected to the slider, a first crushing roller is coaxially fixedly connected to the slider, sensors are evenly installed on the first crushing roller, and scrapers are symmetrically installed on the outside of the first crushing roller; and a crushing component is installed in the crushing box and the mounting box, the crushing component is used to perform secondary crushing of the rare earth after crushing by the first crushing roller.

[0006] Preferably, a fan is installed on the top of the crushing box, a dust cover is installed at the input end of the fan, a three-way pipe is fixedly connected to the output end of the fan, a heating box is fixedly connected to one end of the three-way pipe, and a drying nozzle is connected to the output end of the heating box through a pipe. The drying nozzle is located inside the pretreatment box.

[0007] Preferably, the adjusting mechanism includes a second motor installed in the mounting box, the output end of the second motor is fixedly connected to a first gear via a coupling, the first gear is externally meshed with a second gear, the second gear is externally meshed with a third gear, the first gear is externally meshed with a fourth gear, and the third gear is fixedly connected to one of the first crushing rollers.

[0008] Preferably, both the first gear and the fourth gear are coaxially provided with connecting rods, the connecting rods passing through the slider and being coaxially and fixedly connected to another first crushing roller, and a filter screen is installed at the bottom of the first crushing roller.

[0009] Preferably, the crushing component includes a third motor installed in the mounting box. The output end of the third motor is fixedly connected to a drive wheel via a coupling. A driven wheel is rotatably connected to the upper part of the mounting box. A secondary drive wheel is rotatably connected to one side of the driven wheel. Belts are synchronously provided on the outside of the drive wheel, driven wheel, and secondary drive wheel.

[0010] Preferably, the driving wheel and the driven wheel are coaxially and fixedly connected to a second crushing roller, and the secondary driving wheel is coaxially and fixedly connected to a cam.

[0011] Preferably, a fixing plate is symmetrically installed inside the crushing box, a spring is installed on the top of the fixing plate, a filter plate is installed on the top of the spring, and the filter plate is slidably connected to the inner wall of the crushing box.

[0012] Preferably, the bottom of the filter plate is provided with a protrusion, and the cam corresponds to the protrusion at the bottom of the filter plate and is located inside the receiving frame.

[0013] Preferably, the bottom of the filter plate is provided with a receiving frame, the receiving frame is inclined, and a discharge valve is provided on the outside of the receiving frame, with one side of the receiving frame communicating with the discharge valve.

[0014] Preferably, a branch pipe is fixedly connected to the other end of the three-way pipe, and a cleaning air nozzle is fixedly connected to the branch pipe through the crushing box. A second control valve is installed on the outside of both the three-way pipe and the branch pipe.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This solution includes a processing mechanism that uses a first motor to drive blades to cut rare earth waste, thereby initially crushing large pieces of waste. At the same time, it works with drying nozzles and a drying cylinder to dry the rare earth waste. During the drying process, the rare earth waste is stirred, which breaks it down into smaller pieces. This pre-treatment process is then used by the crushing mechanism, which helps to improve the uniformity of rare earth recycling. 2. This solution is equipped with an adjustment mechanism, which uses multiple gears, connecting rods, sliders and slide frames to work together to facilitate the adjustment of the spacing between the first crushing rollers when they encounter large pieces of waste material. This prevents the first crushing rollers from jamming, thus facilitating the protection of the first crushing rollers and improving their service life. 3. This solution is equipped with a crushing component, which can perform secondary crushing on the crushed rare earth waste, thereby obtaining finer rare earth powder. At the same time, through the linkage of the structure, the filter plate can be vibrated to further prevent the filter plate from clogging, thus improving the crushing efficiency of rare earth waste. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention from another angle; Figure 3 This is a top view of the overall structure of the present invention; Figure 4 This is a front sectional view of the overall structure of the present invention; Figure 5 This is a cross-sectional view of the overall structure of the present invention; Figure 6 This is a schematic diagram of the internal structure of the crushing chamber of the present invention; Figure 7 This is a schematic diagram of the adjustment mechanism structure of the present invention; Figure 8 This is a schematic diagram of the crushing component structure of the present invention; The components represented by each number in the attached diagram are listed below: 1. Crushing box; 2. Pre-treatment box; 3. Mounting box; 4. Processing mechanism; 5. Adjusting mechanism; 6. Crushing component; 7. First motor; 8. Connecting shaft; 9. Blade; 10. Drying drum; 11. Stirring rod; 12. Fan; 13. Dust cover; 14. T-pipe; 15. Heating box; 16. Drying nozzle; 17. First control valve; 18. Scraper; 19. Second motor; 20. First gear; 21. Second gear; 22. Third gear ; 23. Connecting rod; 24. Fixed block; 25. Electric push rod; 26. Sliding frame; 27. Slider; 28. First crushing roller; 29. ​​Sensor; 30. Fourth gear; 31. Third motor; 32. Driving wheel; 33. Driven wheel; 34. Secondary driving wheel; 35. Belt; 36. Cam; 37. Filter plate; 38. Second crushing roller; 39. Fixed plate; 40. Spring; 41. Receiving frame; 42. Discharge valve; 43. Second control valve; 44. Branch pipe; 45. Cleaning air nozzle; 46. Filter screen. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] Example 1: As Figures 1-8 As shown in the diagram, a multi-stage roller-type rare earth waste crushing and recycling device includes a crushing box 1. The entire box adopts an integrated welded structure, providing high structural rigidity and the ability to withstand mechanical vibrations generated during waste crushing, thus reducing the probability of deformation during equipment operation. A pretreatment box 2 is located at the top of the crushing box 1. A first control valve 17 penetrates the bottom of the pretreatment box 1. A top cover with a snap-fit ​​sealing structure is provided at the top of the pretreatment box 2, facilitating manual opening for raw material feeding, internal inspection, and parts replacement. This also reduces dust spillage during pretreatment, optimizing the working environment. An installation box 3 is installed outside the crushing box 1. The installation box 3 adopts a closed sheet metal structure, protecting internal transmission and power components, reducing the probability of external dust and impurities intruding into the internal structure, and minimizing parts wear. The installation box 3 has a door for easy maintenance. It also includes: a processing mechanism 4 installed on the pretreatment box 2, the processing mechanism 4 including a first motor 7 installed outside the pretreatment box 2, the first motor 7 is a variable frequency speed control motor, which can adjust the rotation speed according to the volume and hardness of rare earth waste, and adapt to the pretreatment processing requirements of different specifications of waste. The output end of the first motor 7 is fixedly connected to a connecting shaft 8 through the pretreatment box 2 via a coupling. Blades 9 are evenly installed on the outside of the connecting shaft 8. The blades 9 are made of hard alloy material, which has high hardness and excellent wear resistance. The blade edge adopts an inclined grinding structure to increase the contact and cutting area with rare earth waste. Drying cylinders 10 are installed between the blades 9 at intervals. The interval arrangement structure can reserve space for waste flow and prevent waste accumulation and jamming. A stirring rod 11 is installed on the outside of the drying cylinder 10. The stirring rod 11 and the drying cylinder 10 cooperate with each other to turn the material during rotation and improve the drying uniformity; and an adjustment mechanism 5 installed in the crushing box 1, the adjustment mechanism 5 including a fixing block 24 installed on the mounting box 3. The fixing block 24 is made of cast steel material, which has good load-bearing capacity. The fixing block 24 has an opening inside. A sliding frame 26 has a slider 27 slidably connected inside it. The sliding frame 26 and slider 27 have a smooth, close-fitting sliding structure with low sliding resistance, facilitating smooth displacement of the slider 27. An electric push rod 25 is mounted on the outside of the fixed block 24. The output end of the electric push rod 25 is fixedly connected to the slider 27. The extension and retraction of the electric push rod 25 can drive the slider 27 to complete linear displacement. A first crushing roller pair 28 is coaxially fixedly connected to the slider 27. The surface of the first crushing roller pair 28 is provided with concave and convex crushing teeth, which can increase the biting force with waste material. To improve the coarse crushing effect, sensors 29 are evenly installed on the first crushing rollers 28. The sensors 29 can detect data such as the pressure on the rollers and the thickness of the material in real time, providing data support for the spacing adjustment. Scrapers 18 are symmetrically installed on the outside of the first crushing rollers 28. The scrapers 18 can scrape off the residue on the surface of the first crushing rollers 28. In addition, a crushing component 6 is installed in the crushing box 1 and the mounting box 3. The crushing component 6 is used to perform secondary crushing of the rare earth after crushing by the first crushing rollers 28, realizing multi-stage crushing processing and refining the particle size of the material.

[0019] Furthermore, it should be noted that the first motor 7 drives the connecting shaft 8 to rotate synchronously, causing the blade 9 to follow the shaft in a circular rotational motion. This cuts and shears the large pieces of rare earth waste fed into the pretreatment box 2, thus initially crushing the large pieces of waste and reducing the material volume. Simultaneously, the drying nozzle 16 and the drying cylinder 10 work together to dry the rare earth waste. The drying cylinder 10 integrates a heat-conducting structure, which helps to improve the material drying efficiency. While drying, the stirring rod 11 continuously turns the material, stirring the rare earth waste and breaking up clumps. This decomposes the rare earth waste into small fragments, optimizing the material's looseness. This allows for pretreatment of the crushing component 6, reducing the difficulty of subsequent crushing and processing, and thus facilitating the uniformity of rare earth recovery and ensuring that the particle size difference of the material after crushing is small.

[0020] For further details, please refer to Figure 2 A blower 12 is installed on the top of the crushing box 1. The blower 12 is a high-pressure centrifugal blower, which provides stable airflow and uniform air pressure, ensuring stable airflow delivery. A dust cover 13 is installed at the input end of the blower 12. The dust cover 13 is equipped with multiple layers of filter screens to intercept dust and particulate matter in the outside air, preventing impurities from entering the equipment with the airflow and preventing impurities from contaminating rare earth materials. A three-way pipe 14 is fixedly connected to the output end of the blower 12. The three-way pipe 14 is made of seamless stainless steel pipe, which is wear-resistant and not easy to rust. A heating box 15 is fixedly connected to one end of the three-way pipe 14. The heating box 15 is equipped with an electric heating wire, which can heat the circulating air at a constant temperature and regulate the outlet air temperature. The output end of the heating box 15 is connected to a drying nozzle 16 through a pipe. The drying nozzle 16 is located in the pretreatment box 2. The drying nozzle 16 has an inclined arrangement structure and a multi-hole design for the air outlet, which can expand the coverage of hot air. The drying nozzle 16 is located in the pretreatment box 2 and can spray high-temperature hot air evenly onto the surface of the material.

[0021] Specifically, the other end of the three-way pipe 14 is fixedly connected to a branch pipe 44. The branch pipe 44 passes through the crushing box 1 and is fixedly connected to a cleaning air nozzle 45. The cleaning air nozzle 45 faces the crushing rollers, filter screen 46 and other components that are prone to material accumulation. The high-pressure airflow can blow away and clean the attached material residue. A second control valve 43 is installed on the outside of both the three-way pipe 14 and the branch pipe 44. The second control valve 43 is an electromagnetic control valve. The operator can control the pipeline opening and closing separately according to the processing needs and switch between the drying and cleaning working modes.

[0022] For further details, please refer to... Figure 3 and Figure 6 The adjusting mechanism 5 includes a second motor 19 installed in the mounting box 3. The second motor 19 is a geared motor with a large output torque, which can meet the power requirements of the roller crusher. The output end of the second motor 19 is fixedly connected to a first gear 20 through a coupling. The first gear 20 is externally meshed with a second gear 21, and the second gear 21 is externally meshed with a third gear 22. The multi-stage gear meshing structure can realize the smooth transmission of power and adjust the transmission speed at the same time. The first gear 20 is externally meshed with a fourth gear 30, and the third gear 22 is fixedly connected to one of the first crushing rollers 28. The single set of rollers is driven to rotate by relying on the gear meshing.

[0023] Specifically, both the first gear 20 and the fourth gear 30 are coaxially equipped with connecting rods 23. The connecting rods 23 are made of high-strength alloy steel, which has high torsional strength and is not easy to break or deform. The connecting rods 23 pass through the slider 27 and are coaxially fixedly connected to another first crushing roller 28. The two sets of first crushing rollers 28 adopt a reverse synchronous rotation mode, which can bite and squeeze the material. A filter screen 46 is installed at the bottom of the first crushing roller 28. The filter screen 46 is a perforated metal filter screen with uniform pore size, which can screen materials with qualified particle size and intercept large pieces of materials that do not meet the standards, so that they remain above the rollers for further crushing.

[0024] Through the coordinated operation of multiple gears, connecting rods 23, sliders 27, and sliding frames 26, when sensor 29 detects that large pieces of hard waste material are generating significant extrusion pressure, it can transmit a signal to the control system. The control system then adjusts the electric push rod 25 to drive slider 27 to slide inside sliding frame 26, finely adjusting the distance between the two sets of first crushing rollers 28. This increases the material flow space, allowing large pieces of waste material to pass smoothly through the crushing area, reducing the possibility of the first crushing rollers 28 jamming. This facilitates the protection of the first crushing rollers 28, slows down the wear rate of the rollers, and extends their service life, ensuring continuous and stable operation of the equipment.

[0025] Example 2: Figures 1-8 As shown, this is a further description of Embodiment 1. In this embodiment, the crushing component 6 includes a third motor 31 installed in the mounting box 3. The third motor 31 is a silent drive motor with small vibration amplitude and low noise during operation. The output end of the third motor 31 is fixedly connected to the drive wheel 32 through a coupling. The driven wheel 33 is rotatably connected to the upper part of the mounting box 3. The secondary drive wheel 34 is rotatably connected to one side of the driven wheel 33. The drive wheel 32, driven wheel 33 and secondary drive wheel 34 are all made of wear-resistant cast steel. The wheel body edges are blunted to reduce the wear speed of the belt 35. The drive wheel 32, driven wheel 33 and secondary drive wheel 34 are synchronously provided with belts 35 on the outside. The belts 35 are rubber anti-slip belts, which are not easy to slip during transmission and ensure synchronous power transmission.

[0026] Specifically, such as Figure 7 and Figure 8 As shown, the driving wheel 32 and the driven wheel 33 are coaxially and fixedly connected to the second crushing roller 38. Compared with the first crushing roller 28, the second crushing roller 38 has a higher crushing tooth density and a smaller tooth spacing, which can complete the fine crushing operation of materials. The secondary driving wheel 34 is coaxially and fixedly connected to the cam 36. The cam 36 is an eccentric wheel structure, which can generate a regular pushing force during rotation.

[0027] In addition, a fixing plate 39 is symmetrically installed inside the crushing box 1. The fixing plate 39 is fixed to the inner wall of the crushing box 1 by welding. A spring 40 is installed on the top of the fixing plate 39. The spring 40 is made of high-strength carbon spring steel, which has good elastic deformation ability and stable rebound performance. A filter plate 37 is installed on the top of the spring 40. The filter screen aperture on the surface of the filter plate 37 is smaller than that of the filter screen 46, which can further refine the material screening standard. The filter plate 37 is slidably connected to the inner wall of the crushing box 1 with a small sliding gap, which can maintain the structural stability during vibration.

[0028] Furthermore, the bottom of the filter plate 37 is provided with a protrusion, which has a rounded transition structure to reduce frictional loss with the cam 36. The cam 36 corresponds to the protrusion at the bottom of the filter plate 37. When the cam 36 rotates, it can periodically push the protrusion at the bottom of the filter plate 37, which, together with the spring 40, makes the filter plate 37 vibrate up and down. It is located inside the receiving frame 41. The bottom of the filter plate 37 is provided with a receiving frame 41, which is inclined. The inclination angle makes it easy for the material to slide down automatically by gravity. The outside of the receiving frame 41 is provided with a discharge valve 42. The discharge valve 42 is a manually controlled valve, which can control the material discharge rhythm independently. One side of the receiving frame 41 is connected to the discharge valve 42. The screened material can be collected inside the receiving frame 41 and finally discharged by the discharge valve 42.

[0029] The crushing component 6 can perform secondary crushing on the crushed rare earth waste, thereby obtaining finer rare earth powder. At the same time, through the linkage of the structure, the filter plate 37 can be vibrated to further prevent the filter plate 37 from clogging, thereby improving the crushing efficiency of rare earth waste and enhancing the recycling and processing quality of rare earth waste.

[0030] In summary, when using this device, the operator first opens the top cover of the pretreatment box 2 and puts the rare earth waste to be processed into the pretreatment box 2. After the waste is put in, the top cover is closed to ensure the airtightness of the box. Then, the first motor 7, the blower 12, and the heating box 15 are started. The first motor 7 drives the connecting shaft 8 to rotate, so that the blades 9 cut and crush the large pieces of rare earth waste. At the same time, the drying cylinder 10 works with the stirring rod 11 to turn the material. The blower 12 draws in outside air, which is filtered through the dust cover 13 and enters the three-way pipe 14. The operator adjusts the corresponding second control valve 43 to make the airflow flow into the heating box 15 to complete the heating. The high-temperature hot air is sprayed out from the drying nozzle 16 to dry and dehumidify the waste during the turning process, break up the clumps, and complete the pretreatment processing.

[0031] The pre-processed material falls into the crushing chamber 1, landing above the first crushing rollers 28. The second motor 19 is activated, and through multi-stage gear meshing, drives the two sets of first crushing rollers 28 to rotate in opposite directions, performing initial crushing and compression. The material is then screened by the filter screen 46; material meeting the particle size standard falls to the second crushing rollers 38 below, while material not meeting the standard remains for further crushing. The sensor 29 monitors the crushing pressure in real time. When encountering hard, large pieces of material, the electric push rod 25 pushes the slider 27 to slide, finely adjusting the roller spacing to suit the material crushing requirements.

[0032] The material, after initial crushing, enters the crushing unit 6. The third motor 31 is started, and the drive wheel 32, driven wheel 33, and secondary drive wheel 34 are driven synchronously by the belt 35. The second crushing roller 38 performs secondary fine crushing of the material, and the crushed material falls onto the surface of the filter plate 37. The cam 36 continuously rotates and pushes the filter plate 37, which, together with the spring 40, achieves vibration screening. Qualified rare earth powder passes through the filter plate 37 and falls into the inclined receiving frame 41. The operator opens the discharge valve 42 to complete the material collection.

[0033] During equipment processing breaks, operators can switch the on / off state of the second control valve 43 to allow airflow to be sprayed out from the cleaning nozzle 45 through the branch pipe 44 to blow away and clean the residues attached to the surface of the first crushing roller 28, the second crushing roller 38, and the filter screen 46, reducing material residue and facilitating the continued use of the equipment.

[0034] The above description shows and illustrates the basic principles, main features, and advantages of the present invention. Standard parts used in the present invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts, and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0035] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A multi-stage roller-type rare earth waste crushing and recycling device, comprising a crushing box (1), a pretreatment box (2) provided on the top of the crushing box (1), a first control valve (17) provided through the bottom of the pretreatment box (2) through the crushing box (1), a top cover provided on the top of the pretreatment box (2), an installation box (3) installed on the outside of the crushing box (1), and a door provided on the outside of the installation box (3); Its features are, Also includes: A processing mechanism (4) is installed on the pretreatment box (2). The processing mechanism (4) includes a first motor (7) installed outside the pretreatment box (2). The output end of the first motor (7) is fixedly connected to a connecting shaft (8) through the pretreatment box (2) via a coupling. Blades (9) are evenly installed on the outside of the connecting shaft (8). Drying cylinders (10) are installed at intervals between the blades (9). A stirring rod (11) is installed on the outside of the drying cylinder (10). An adjustment mechanism (5) is installed inside the crushing box (1). The adjustment mechanism (5) includes a fixed block (24) installed on the mounting box (3). A sliding frame (26) is provided inside the fixed block (24). A slider (27) is slidably connected inside the sliding frame (26). An electric push rod (25) is installed outside the fixed block (24). The output end of the electric push rod (25) is fixedly connected to the slider (27). A first crushing roller (28) is coaxially fixedly connected to the slider (27). Sensors (29) are evenly installed on the first crushing roller (28). Scrapers (18) are symmetrically installed on the outside of the first crushing roller (28). The crushing component (6) is installed in the crushing box (1) and the mounting box (3). The crushing component (6) is used to perform secondary crushing of rare earth after it has been crushed by the first crushing roller (28).

2. The multi-stage roller crushing and recycling device for rare earth waste according to claim 1, characterized in that: A fan (12) is installed on the top of the crushing box (1). A dust cover (13) is installed at the input end of the fan (12). A three-way pipe (14) is fixedly connected to the output end of the fan (12). A heating box (15) is fixedly connected to one end of the three-way pipe (14). A drying nozzle (16) is connected to the output end of the heating box (15) through a pipe. The drying nozzle (16) is located inside the pretreatment box (2).

3. The multi-stage roller crushing and recycling device for rare earth waste according to claim 1, characterized in that: The adjustment mechanism (5) includes a second motor (19) installed in the mounting box (3). The output end of the second motor (19) is fixedly connected to a first gear (20) via a coupling. The first gear (20) is externally meshed with a second gear (21). The second gear (21) is externally meshed with a third gear (22). The first gear (20) is externally meshed with a fourth gear (30). The third gear (22) is fixedly connected to one of the first crushing rollers (28).

4. The multi-stage roller crushing and recycling device for rare earth waste according to claim 3, characterized in that: The first gear (20) and the fourth gear (30) are both provided with a connecting rod (23) on the same axis. The connecting rod (23) passes through the slider (27) and is fixedly connected to another first crushing roller (28) on the same axis. A filter screen (46) is installed at the bottom of the first crushing roller (28).

5. The multi-stage roller crushing and recycling device for rare earth waste according to claim 1, characterized in that: The crushing component (6) includes a third motor (31) installed in the mounting box (3). The output end of the third motor (31) is fixedly connected to a drive wheel (32) via a coupling. A driven wheel (33) is rotatably connected to the upper part of the mounting box (3). A secondary drive wheel (34) is rotatably connected to one side of the driven wheel (33). The drive wheel (32), driven wheel (33) and secondary drive wheel (34) are synchronously provided with belts (35) on their exteriors.

6. The multi-stage roller crushing and recycling device for rare earth waste according to claim 5, characterized in that: The driving wheel (32) and the driven wheel (33) are coaxially fixedly connected to a second crushing roller (38), and the secondary driving wheel (34) is coaxially fixedly connected to a cam (36).

7. A multi-stage roller-type rare earth waste crushing and recycling device according to claim 6, characterized in that: A fixing plate (39) is symmetrically installed inside the crushing box (1). A spring (40) is installed on the top of the fixing plate (39). A filter plate (37) is installed on the top of the spring (40). The filter plate (37) is slidably connected to the inner wall of the crushing box (1).

8. The multi-stage roller crushing and recycling device for rare earth waste according to claim 7, characterized in that: The bottom of the filter plate (37) is provided with a protrusion, and the cam (36) corresponds to the bottom protrusion of the filter plate (37) and is located inside the receiving frame (41).

9. A multi-stage roller-type rare earth waste crushing and recycling device according to claim 8, characterized in that: The bottom of the filter plate (37) is provided with a receiving frame (41), which is inclined. The outside of the receiving frame (41) is provided with a discharge valve (42), and one side of the receiving frame (41) is connected to the discharge valve (42).

10. A multi-stage roller-type rare earth waste crushing and recycling device according to claim 2, characterized in that: The other end of the three-way pipe (14) is fixedly connected to a branch pipe (44), and the branch pipe (44) passes through the crushing box (1) and is fixedly connected to a cleaning air nozzle (45). A second control valve (43) is installed on the outside of both the three-way pipe (14) and the branch pipe (44).

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