A multi-stage grinding production line and process of magnetic powder with integrated online magnetic separation function

Abstract

This invention relates to the field of magnetic material production technology and discloses a multi-stage magnetic powder grinding production line and process integrating online magnetic separation function. The production line includes a base plate and a crushing hopper. In this invention, a two-stage online magnetic separation structure is set up. During the crushing stage, large pieces of iron filings, steel slag, and other hard iron impurities are intercepted by permanent magnet rods within the frame. After ball milling, a dynamic magnetic field is formed by a fixed permanent magnet block and a rotating outer cylinder to separate fine non-magnetic impurities. The entire process involves online impurity removal without additional transfer steps, effectively improving the purity of the magnetic powder and preventing hard impurities from damaging subsequent grinding equipment. The production line sequentially integrates three grinding processes: coarse crushing with crushing rollers, fine grinding with a ball mill, and ultra-fine grinding with an air jet mill. A cyclone separator completes particle size classification, and coarse powder can be returned for secondary grinding, achieving gradient-style fine processing of the magnetic powder. The air jet mill is equipped with an air compressor, air tank, and air supply ring, ensuring uniform and stable air supply and controllable grinding intensity. The final magnetic powder produced has good particle size consistency, significantly improving the quality of the finished product.

Description

Technical Field

[0001] This invention relates to the field of magnetic material production technology, specifically to a multi-stage grinding production line and process for magnetic powder with integrated online magnetic separation function. Background Technology

[0002] Magnetic powder is a core raw material for manufacturing permanent magnet devices, soft magnetic components, electromagnetic induction equipment, bonded magnets, and other magnetic products. The particle size uniformity, morphology, purity, and magnetic property consistency of magnetic powder directly determine the permeability, coercivity, stability, and service life of the final magnetic device. With the rapid development of new energy, intelligent equipment, electronic communications, and other fields, the market demand for high-precision, high-purity, and highly consistent magnetic powder continues to increase, highlighting the shortcomings of traditional magnetic powder processing production lines and processes.

[0003] Traditional grinding production lines lack targeted magnetic separation and purification structures, making it easy for non-magnetic impurities to mix into the magnetic powder raw materials and during the grinding process. These impurities cannot be removed by mechanical grinding and ordinary sieving, ultimately resulting in low purity of the finished magnetic powder, severely affecting its magnetic properties and causing problems such as high magnetic loss and unstable performance in the end product. In addition, the existing multi-stage grinding process has poor continuity. The grinding and sorting processes are independent of each other. After the material is refined through multiple stages of grinding, it needs to be transferred to independent sorting equipment to complete impurity separation and particle screening. The discontinuity of the process not only significantly reduces the overall processing efficiency of the production line and increases the pollution loss during material transfer, but also causes some ultrafine magnetic powder particles to agglomerate and stick together, resulting in grinding coarsening. This leads to large particle size distribution and poor particle uniformity in the finished magnetic powder, making it difficult to meet the fine material standards of high-end magnetic devices. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a multi-stage magnetic powder grinding production line and process that integrates online magnetic separation function, solving the problems of low magnetic powder purity, poor grinding process continuity, and low production efficiency in existing multi-stage magnetic powder grinding production lines.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multi-stage grinding production line for magnetic powder with integrated online magnetic separation function, comprising a base plate and a crushing bucket, wherein a separation component is provided on the base plate, and the separation component is used to separate impurities in the magnetic powder; The separation assembly includes a frame that is slidably connected to a crushing bucket. Multiple permanent magnet rods are evenly installed within the frame. A movable groove is formed on the frame, and a slider is slidably connected within the movable groove. A scraper is fixedly connected to the end of the slider away from the movable groove. The scraper moves to remove impurities adsorbed by the permanent magnet rods. Two side plates are fixedly connected to the upper surface of the base plate. A fixed shaft and a conveyor belt are installed between the two side plates. A permanent magnet block is fixedly connected to the outer wall of the fixed shaft. An outer cylinder is fitted onto the outer wall of the permanent magnet block and is located above the conveyor belt. Hollow shafts are fixedly connected to both ends of the outer cylinder and are coaxially fitted with the fixed shaft. The hollow shafts are rotatably connected to the side plates.

[0006] Preferably, a connecting plate is fixedly connected to the side of the frame near the conveyor belt, and sleeves are fixedly connected to both sides of the crushing bucket. An insert is slidably connected inside the sleeve, and the insert is fixedly connected to the connecting plate.

[0007] Preferably, the outer wall of the sleeve is provided with an adjustment groove, a sliding plate is slidably connected in the adjustment groove, and a slip ring is slidably connected to the outer wall of the sleeve, with the slip ring and the sliding plate being fixedly connected.

[0008] Preferably, a return spring is fitted on the outer wall of the sleeve, a limit ring is fixedly connected to the outer wall of the sleeve, a plurality of rolling grooves are evenly opened in the circumference of the sleeve, a ball is installed in the rolling groove, and a slot is opened on the insertion tube, and the ball engages with the slot.

[0009] Preferably, a lifting slide rail is fixedly connected to the upper surface of the base plate, a threaded seat is slidably connected inside the lifting slide rail, a first threaded rod is rotatably connected inside the lifting slide rail, and the threaded seat is threadedly connected to the first threaded rod, and the threaded seat is fixedly connected to the crushing bucket.

[0010] Preferably, two crushing rollers are symmetrically installed inside the crushing bucket, and the crushing rollers are located above the frame. A discharge pipe is fixedly connected to the output end of the crushing bucket, and a flap is rotatably connected inside the discharge pipe.

[0011] Preferably, two support plates are fixedly connected to the upper surface of the base plate, and a ball mill and a guide plate are installed between the two support plates. The guide plate is located above the conveyor belt, the ball mill is rotatably connected to the support plates, and the guide plate is located below the ball mill.

[0012] Preferably, an air compressor, an air tank, an air jet mill, and a cyclone separator are fixedly connected to the upper surface of the base plate, and a material collection hopper is fixedly connected to one end of the two side plates near the air compressor. A feed pipe is fixedly connected to the output end of the material collection hopper, and the material collection hopper and the air jet mill are connected through the feed pipe.

[0013] Preferably, the outer wall of the air mill is fitted with an air supply ring, the upper surface of the two side plates is fixedly connected to a fixing frame, a scraper plate is fixedly connected inside the fixing frame, and a second threaded rod is rotatably connected inside the moving groove, and the second threaded rod is threadedly connected to the slider.

[0014] A production process for multi-stage grinding of magnetic powder with integrated online magnetic separation function includes the following steps: S1. The overall height of the crushing bucket is adjusted by the transmission of the lifting slide rail on the bottom plate, the first threaded rod and the threaded seat, so that the discharge pipe is inserted into the feed port of the ball mill. The magnetic powder raw material to be processed is put into the crushing bucket. The two crushing rollers installed symmetrically inside the crushing bucket are started to crush and refine the blocky and granular magnetic powder raw material. During the fall of the crushed magnetic powder material, it passes through the frame area below the crushing bucket. The magnetic field generated by the multiple permanent magnets evenly distributed inside the frame uses the medium and low field strength to intercept hard large iron debris such as iron blocks, steel chips, and iron slag from equipment wear. After crushing, the material discharge channel is opened by flipping the flap inside the discharge pipe, so that the crushed magnetic powder material falls downward into the ball mill. S2. Start the ball mill to refine the initially crushed magnetic powder particles, reducing the particle size. After secondary grinding, the magnetic powder automatically falls onto the conveyor belt via the guide plate. The scraper plate smooths and evens the material on the surface of the conveyor belt. The permanent magnet is fixed, and the outer cylinder rotates, forming a stable and strong magnetic field on the surface of the outer cylinder. The ferromagnetic powder is firmly attracted to the outer cylinder by the magnetic field and rotates with the outer cylinder. Non-magnetic impurities are separated along the conveyor belt. When the outer cylinder moves to the non-magnetic zone, the magnetic field suddenly disappears, and the magnetic powder automatically falls into the collection hopper. S3. The material is conveyed into the air jet mill through the feed pipe at the output end of the hopper. The air compressor and air tank on the bottom plate are started simultaneously to provide a stable high-pressure airflow to the air jet mill. The air is evenly distributed by the air conveying ring on the outer wall of the air jet mill. The high-pressure airflow is used to perform ultra-fine air jet grinding on the ball-milled magnetic powder. The magnetic powder processed by the air jet mill is screened by its internal classifying wheel. The qualified fine powder enters the cyclone separator with the airflow. The coarse powder automatically falls back and collides and grinds again. Through the centrifugal classification principle of the cyclone separator, the magnetic powder of different particle sizes is classified and screened. The fine magnetic powder product with qualified particle size is collected.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention employs a two-stage online magnetic separation structure. During the crushing stage, large pieces of iron filings, steel slag, and other hard iron impurities are trapped by permanent magnets within the frame. After ball milling, a dynamic magnetic field is formed by fixed permanent magnets and a rotating outer cylinder to separate fine non-magnetic impurities. The entire process involves online impurity removal, eliminating the need for additional transfer steps, effectively improving the purity of the magnetic powder and preventing hard impurities from damaging subsequent grinding equipment. Simultaneously, a scraper automatically removes impurities adsorbed on the surface of the permanent magnets, preventing saturation and ensuring efficient impurity removal. This enhances the equipment's continuous operation capability, and the entire production line forms an integrated closed-loop process with a high degree of automation, reducing manual intervention and effectively improving overall production efficiency.

[0016] 2. In this invention, the production line sequentially integrates three grinding processes: coarse crushing with crushing rollers, fine grinding with a ball mill, and ultrafine grinding with an air jet mill. A cyclone separator completes particle size classification, and coarse powder can be recycled for secondary grinding, achieving gradient-style fine processing of the magnetic powder. The air jet mill is equipped with an air compressor, air tank, and air supply ring, ensuring uniform and stable air supply and controllable grinding intensity. The resulting magnetic powder exhibits good particle size consistency, significantly improving the quality of the finished product. Furthermore, the frame utilizes a sliding snap-fit ​​structure formed by inserts, sleeves, balls, and slots, along with slip rings and return springs to achieve position locking and quick assembly / disassembly, facilitating the inspection, cleaning, and maintenance of the permanent magnet rod assembly. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a multi-stage magnetic powder grinding production line and process integrating online magnetic separation function according to the present invention; Figure 2 This is a cross-sectional view of the lifting slide rail structure of a multi-stage magnetic powder grinding production line and process integrating online magnetic separation function according to the present invention. Figure 3 This is a cross-sectional view of the crushing bucket of a multi-stage magnetic powder grinding production line and process integrating online magnetic separation function according to the present invention. Figure 4 This is a cross-sectional view of the framework of a multi-stage magnetic powder grinding production line and process integrating online magnetic separation function according to the present invention. Figure 5 This is a schematic cross-sectional view of the sleeve structure of a multi-stage magnetic powder grinding production line and process integrating online magnetic separation function according to the present invention. Figure 6 This is a cross-sectional view of the outer cylinder of a multi-stage magnetic powder grinding production line and process integrating online magnetic separation function according to the present invention.

[0018] In the diagram: 1. Base plate; 2. Cyclone separator; 3. Air jet mill; 4. Air conveying ring; 5. Ball mill; 6. Crushing bucket; 7. Connecting plate; 8. Lifting slide rail; 9. Guide plate; 10. Side plate; 11. Conveyor belt; 12. Fixing frame; 13. Scraper plate; 14. Air compressor; 15. Air storage tank; 16. Threaded seat; 17. First threaded rod; 18. Support plate; 19. Hollow shaft; 20. Discharge pipe; 21. Crushing roller; 22. Frame; 23. Flip plate; 24. Moving groove; 25. Second threaded rod; 26. Slider; 27. Scraper; 28. Permanent magnet; 29. ​​Sleeve; 30. Insert tube; 31. Adjusting groove; 32. Slip ring; 33. Slide plate; 34. Slot; 35. Rolling groove; 36. Ball bearing; 37. Return spring; 38. Limiting ring; 39. Fixed shaft; 40. Collection hopper; 41. Feed pipe; 42. Permanent magnet block; 43. Outer cylinder. Detailed Implementation

[0019] 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.

[0020] refer to Figures 1-6 The magnetic powder multi-stage grinding production line with integrated online magnetic separation function shown includes a base plate 1 and a crushing bucket 6. A separation component is provided on the base plate 1. The separation component is used to separate impurities in the magnetic powder. A specific embodiment is shown below.

[0021] Example 1 A lifting slide rail 8 is fixedly connected to the upper surface of the base plate 1. A threaded seat 16 is slidably connected inside the lifting slide rail 8. A first threaded rod 17 is rotatably connected inside the lifting slide rail 8, and the threaded seat 16 is threadedly connected to the first threaded rod 17. The threaded seat 16 is fixedly connected to the crushing bucket 6. Two crushing rollers 21 are symmetrically installed inside the crushing bucket 6, and the crushing rollers 21 are located above the frame 22. A discharge pipe 20 is fixedly connected to the output end of the crushing bucket 6. A flap 23 is rotatably connected inside the discharge pipe 20. Two support plates 18 are fixedly connected to the upper surface of the base plate 1. A ball mill 5 and a guide plate 9 are installed between the two support plates 18, and the guide plate 9 is located above the conveyor belt 11. The ball mill 5 is rotatably connected to the support plate 18, and the guide plate 9 is located below the ball mill 5.

[0022] The drive motor rotates the first threaded rod 17 in both directions, which in turn drives the threaded seat 16 and the crushing bucket 6 to adjust their lifting and lowering positions along the lifting slide rail 8. Two parallel crushing rollers 21 are symmetrically installed inside the crushing bucket 6. These rollers work together to crush and pre-grind the blocky and granular magnetic powder raw materials. The crushing rollers 21 are positioned directly above the frame 22 of the subsequent separation assembly, ensuring that the crushed material falls precisely into the separation area. A flap 23 is rotatably connected to the discharge pipe 20 via a pin. The flap 23 is matched to the inner diameter of the discharge pipe 20, allowing for both opening and closing of the discharge pipe. This facilitates control of the raw material discharge flow rate and start / stop discharge, while also allowing for pipe closure during equipment maintenance to prevent dust leakage. The raw material, pre-crushed by the crushing bucket 6, falls into the ball mill 5 for secondary grinding. The ground magnetic powder is then smoothly guided by the inclined guide plate 9 below and precisely falls onto the surface of the conveyor belt 11, achieving continuous material transport and ensuring continuous operation of the production line.

[0023] Example 2 The separation assembly includes a frame 22, which is slidably connected to the crushing bucket 6. Multiple permanent magnet rods 28 are evenly installed inside the frame 22. A moving groove 24 is provided on the frame 22, and a slider 26 is slidably connected within the moving groove 24. A scraper 27 is fixedly connected to the end of the slider 26 away from the moving groove 24. The scraper 27 moves to scrape away impurities adsorbed by the permanent magnet rods 28. Two side plates 10 are fixedly connected to the upper surface of the bottom plate 1. A fixed shaft 39 and a conveyor belt 11 are installed between the two side plates 10. The outer wall of the fixed shaft 39... A permanent magnet block 42 is fixedly connected. An outer cylinder 43 is sleeved on the outer wall of the permanent magnet block 42 and is located above the conveyor belt 11. Hollow shafts 19 are fixedly connected to both ends of the outer cylinder 43 and are coaxially fitted with a fixed shaft 39. The hollow shafts 19 are rotatably connected to the side plates 10. A fixed frame 12 is fixedly connected to the upper surface of the two side plates 10. A scraper plate 13 is fixedly connected inside the fixed frame 12. A second threaded rod 25 is rotatably connected inside the moving groove 24 and is threadedly connected to the slider 26.

[0024] When the crushed and ground magnetic powder material passes through the inside of the frame 22, the magnetic field generated by the multiple permanent magnet rods 28 evenly distributed inside the frame 22 is used to intercept hard large pieces of iron debris such as iron blocks, steel chips, and iron slag from equipment wear using a medium-low field strength. By driving the slider 26 to move horizontally back and forth, the scraper 27 can be driven to slide along the axial direction of the permanent magnet rods 28 to thoroughly scrape off the magnetic impurities adsorbed on the surface of the permanent magnet rods 28, avoiding the permanent magnet rods 28 from becoming saturated and affecting the separation effect. A fixed shaft 39 and a conveyor belt 11 are installed horizontally between the two side plates 10. The conveyor belt 11 is arranged around the perimeter to receive the magnetic powder material falling from the guide plate 9 and transport it backward. The outer cylinder 43 can rotate freely relative to the fixed shaft 39, and the outer cylinder 43 is set to fit the upper inner surface of the conveyor belt 11 and is located directly above the conveying path of the conveyor belt 11. The permanent magnet block 42 continuously generates a magnetic field to perform secondary magnetic adsorption and impurity removal on the magnetic powder material conveyed on the conveyor belt 11, further removing residual fine magnetic impurities and greatly improving the magnetic powder purification effect. In addition, the bottom end of the scraper plate 13 is slightly attached to the upper surface of the conveyor belt 11, which can level and spread the magnetic powder material during the conveying process, avoid material accumulation and clumping, ensure that the material is in full contact with the magnetic field, and improve the uniformity and effectiveness of secondary magnetic separation.

[0025] Example 3 A connecting plate 7 is fixedly connected to the side of the frame 22 near the conveyor belt 11. Sleeves 29 are fixedly connected to both sides of the crushing bucket 6. Insert tubes 30 are slidably connected inside the sleeves 29 and are fixedly connected to the connecting plate 7. An adjustment groove 31 is provided on the outer wall of the sleeves 29. A sliding plate 33 is slidably connected inside the adjustment groove 31. A slip ring 32 is slidably connected to the outer wall of the sleeves 29 and is fixedly connected to the sliding plate 33. A return spring 37 is sleeved on the outer wall of the sleeves 29. A limit ring 38 is fixedly connected to the outer wall of the sleeves 29. Multiple rolling grooves 35 are evenly provided around the sleeves 29. Ball bearings 36 are installed in the rolling grooves 35. A slot 34 is provided on the insert tube 30 and the ball bearings 36 are engaged with the slot 34.

[0026] Under the elastic pushing action of the return spring 37, the slip ring 32 and the slide plate 33 remain locked, allowing the ball bearing 36 to be stably engaged in the slot 34 of the insertion tube 30, thus locking and fixing the insertion tube 30 and the sleeve 29. This effectively prevents the frame 22 from shifting or shaking due to equipment vibration, ensuring the stability of the magnetic separation operation. When it is necessary to clean impurities from the permanent magnet rod 28, manually pull the slip ring 32 and compress the return spring 37. This causes the slide plate 33 to shift and release the locking limit of the ball bearing 36 on the slot 34, releasing the locking state between the insertion tube 30 and the sleeve 29. The insertion tube 30 can then be directly pulled out from the sleeve 29, allowing for quick disassembly of the frame 22.

[0027] Example 4 An air compressor 14, an air tank 15, an air jet mill 3, and a cyclone separator 2 are fixedly connected to the upper surface of the base plate 1. A material collection hopper 40 is fixedly connected to one end of the two side plates 10 near the air compressor 14. A feed pipe 41 is fixedly connected to the output end of the material collection hopper 40. The material collection hopper 40 and the air jet mill 3 are connected through the feed pipe 41. An air supply ring 4 is fitted on the outer wall of the air jet mill 3.

[0028] The collecting hopper 40 is connected to the feed end of the air classifier 3 through the feed pipe 41. The collected magnetic powder material is smoothly transported into the air classifier 3 through the feed pipe 41 to complete continuous feeding. The air compressor 14 is used to compress air, which is stored in the air tank 15. The outer wall of the air classifier 3 is coaxially fitted with an annular air conveying ring 4. The air conveying ring 4 is connected to the air tank 15 through a high-pressure pipeline. The stabilizing high-pressure gas inside the air tank 15 is evenly input into the air classifier 3 through the air conveying ring 4 to form a high-speed airflow field. The ultra-fine grinding of magnetic powder is achieved by using the airflow collision and shearing principle. The magnetic powder processed by the air classifier 3 is screened by its internal classifying wheel. The qualified fine powder enters the cyclone separator 2 with the airflow, while the coarse powder automatically falls back to collide and grind again. Through the centrifugal classification principle of the cyclone separator 2, the magnetic powder of different particle sizes is classified and screened, and the fine magnetic powder product with qualified particle size is collected.

[0029] A production process for multi-stage grinding of magnetic powder with integrated online magnetic separation function includes the following steps: S1. The overall height of the crushing bucket 6 is adjusted by the transmission of the lifting slide rail 8, the first threaded rod 17 and the threaded seat 16 on the base plate 1, so that the discharge pipe 20 is inserted into the feed port of the ball mill 5. The magnetic powder raw material to be processed is put into the crushing bucket 6. The two crushing rollers 21 installed symmetrically inside the crushing bucket 6 are started to crush and refine the blocky and granular magnetic powder raw material. During the fall of the crushed magnetic powder material, it passes through the frame 22 area below the crushing bucket 6. The magnetic field generated by the multiple permanent magnet rods 28 evenly arranged inside the frame 22 uses the medium and low field strength to intercept hard large pieces of iron debris such as iron blocks, steel chips, and iron slag from equipment wear. After crushing, the material discharge channel is opened by flipping the flap 23 inside the discharge pipe 20, so that the crushed magnetic powder material falls downward into the ball mill 5. S2. Start the ball mill 5 to refine the initially crushed magnetic powder particles through ball milling, reducing the particle size. After the secondary grinding of the magnetic powder, it automatically falls onto the conveyor belt 11 through the guide plate 9. The scraper plate 13 scrapes and smooths the material on the surface of the conveyor belt 11. The permanent magnet block 42 is fixed, and the outer cylinder 43 rotates. A stable and strong magnetic field is formed on the surface of the outer cylinder 43. The ferromagnetic magnetic powder is firmly attracted to the outer cylinder 43 by the magnetic field and rotates with the outer cylinder 43. Non-magnetic impurities are separated along the conveyor belt 11. When the outer cylinder 43 moves to the non-magnetic area, the magnetic field suddenly disappears, and the magnetic powder automatically falls into the collection hopper 40. S3. The material is conveyed into the air classifier 3 through the feed pipe 41 at the output end of the hopper 40. The air compressor 14 and the air tank 15 on the bottom plate 1 are started simultaneously to provide a stable high-pressure airflow to the air classifier 3. The air is evenly distributed by the air conveying ring 4 on the outer wall of the air classifier 3. The magnetic powder after ball milling is subjected to ultra-fine airflow grinding by the high-pressure airflow. The magnetic powder processed by the air classifier 3 is screened by its internal classifying wheel. The qualified fine powder enters the cyclone separator 2 with the airflow. The coarse powder automatically falls back and collides and grinds again. Through the centrifugal classification principle of the cyclone separator 2, the magnetic powder of different particle sizes is classified and screened. The fine magnetic powder product with qualified particle size is collected.

[0030] The working principle of this invention is as follows: The overall height of the crushing bucket 6 is adjusted by the transmission of the lifting slide rail 8, the first threaded rod 17, and the threaded seat 16 on the base plate 1, allowing the discharge pipe 20 to be inserted into the feed inlet of the ball mill 5. The magnetic powder raw material to be processed is fed into the crushing bucket 6. The two symmetrically installed crushing rollers 21 inside the crushing bucket 6 are activated to crush and refine the blocky and granular magnetic powder raw material. During the fall of the crushed magnetic powder material, it passes through the frame 22 area below the crushing bucket 6. The magnetic field generated by the permanent magnet rod 28 traps hard, large pieces of iron debris such as iron blocks, steel chips, and equipment wear slag. The flap 23 inside the discharge pipe 20 is flipped, opening the material discharge channel, allowing the crushed magnetic powder material to fall into the ball mill 5. The ball mill 5 is then started to operate, performing fine ball milling on the initially crushed magnetic powder particles to reduce the particle size. After the secondary grinding of the magnetic powder is completed... The material automatically falls onto the conveyor belt 11 via the guide plate 9. The scraper plate 13 smooths and flattens the material on the surface of the conveyor belt 11. The permanent magnet block 42 is fixed, and the outer cylinder 43 rotates. A stable and strong magnetic field is formed on the surface of the outer cylinder 43. The ferromagnetic powder is firmly attracted to the outer cylinder 43 by the magnetic field and rotates with the outer cylinder 43. Non-magnetic impurities are separated along the conveyor belt 11. When the outer cylinder 43 moves to the non-magnetic area, the magnetic field suddenly disappears, and the magnetic powder automatically falls into the collection hopper 40. The material is transported to the inside of the air jet mill 3 through the feed pipe 41 at the output end of the collection hopper 40. The air compressor 14 on the bottom plate 1 is started simultaneously. The high-pressure airflow is used to perform ultra-fine airflow grinding on the ball-milled magnetic powder. The magnetic powder processed by the air jet mill 3 is screened by its internal classifying wheel. Through the centrifugal classification principle of the cyclone separator 2, the magnetic powder of different particle sizes is classified and screened. The fine magnetic powder product with qualified particle size is collected.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-stage magnetic powder grinding production line integrating online magnetic separation function, comprising a base plate (1) and a crushing bucket (6), characterized in that: A separation component is provided on the base plate (1), which is used to separate impurities in the magnetic powder; The separation component includes a frame (22), which is slidably connected to the crushing bucket (6). Multiple permanent magnet rods (28) are evenly installed inside the frame (22). A moving groove (24) is provided on the frame (22), and a slider (26) is slidably connected inside the moving groove (24). A scraper (27) is fixedly connected to one end of the slider (26) away from the moving groove (24). The scraper (27) moves to scrape away impurities adsorbed by the permanent magnet rods (28). The upper surface of the base plate (1) is fixedly connected to... There are two side plates (10), and a fixed shaft (39) and a conveyor belt (11) are installed between the two side plates (10). A permanent magnet block (42) is fixedly connected to the outer wall of the fixed shaft (39). An outer cylinder (43) is sleeved on the outer wall of the permanent magnet block (42), and the outer cylinder (43) is located above the conveyor belt (11). Hollow shafts (19) are fixedly connected to both ends of the outer cylinder (43), and the hollow shafts (19) are coaxially fitted with the fixed shaft (39). The hollow shafts (19) are rotatably connected to the side plates (10).

2. The multi-stage magnetic powder grinding production line integrating online magnetic separation function according to claim 1, characterized in that: A connecting plate (7) is fixedly connected to the side of the frame (22) near the conveyor belt (11), and a sleeve (29) is fixedly connected to both sides of the crushing bucket (6). An insert (30) is slidably connected inside the sleeve (29), and the insert (30) is fixedly connected to the connecting plate (7).

3. The multi-stage magnetic powder grinding production line integrating online magnetic separation function according to claim 2, characterized in that: The outer wall of the sleeve (29) is provided with an adjustment groove (31), and a sliding plate (33) is slidably connected in the adjustment groove (31). A slip ring (32) is slidably connected to the outer wall of the sleeve (29), and the slip ring (32) is fixedly connected to the sliding plate (33).

4. The multi-stage magnetic powder grinding production line integrating online magnetic separation function according to claim 3, characterized in that: The outer wall of the sleeve (29) is fitted with a reset spring (37), and the outer wall of the sleeve (29) is fixedly connected with a limit ring (38). The sleeve (29) is evenly provided with multiple rolling grooves (35) in the circumference. A ball (36) is installed in the rolling groove (35). A slot (34) is provided on the insertion tube (30), and the ball (36) is engaged with the slot (34).

5. The multi-stage magnetic powder grinding production line integrating online magnetic separation function according to claim 1, characterized in that: The upper surface of the base plate (1) is fixedly connected to a lifting slide rail (8), a threaded seat (16) is slidably connected inside the lifting slide rail (8), a first threaded rod (17) is rotatably connected inside the lifting slide rail (8), and the threaded seat (16) is threadedly connected to the first threaded rod (17). The threaded seat (16) is fixedly connected to the crushing bucket (6).

6. The multi-stage magnetic powder grinding production line with integrated online magnetic separation function according to claim 1, characterized in that: Two crushing rollers (21) are symmetrically installed inside the crushing bucket (6), and the crushing rollers (21) are located above the frame (22). The output end of the crushing bucket (6) is fixedly connected to a discharge pipe (20), and a flap (23) is rotatably connected inside the discharge pipe (20).

7. The multi-stage magnetic powder grinding production line with integrated online magnetic separation function according to claim 1, characterized in that: Two support plates (18) are fixedly connected to the upper surface of the base plate (1). A ball mill (5) and a guide plate (9) are installed between the two support plates (18). The guide plate (9) is located above the conveyor belt (11). The ball mill (5) is rotatably connected to the support plate (18), and the guide plate (9) is located below the ball mill (5).

8. The multi-stage magnetic powder grinding production line with integrated online magnetic separation function according to claim 1, characterized in that: An air compressor (14), an air tank (15), an air mill (3), and a cyclone separator (2) are fixedly connected to the upper surface of the base plate (1). A collection hopper (40) is fixedly connected to one end of the two side plates (10) near the air compressor (14). A feed pipe (41) is fixedly connected to the output end of the collection hopper (40). The collection hopper (40) and the air mill (3) are connected through the feed pipe (41).

9. A multi-stage magnetic powder grinding production line integrating online magnetic separation function according to claim 8, characterized in that: The outer wall of the air mill (3) is fitted with an air supply ring (4), and the upper surfaces of the two side plates (10) are fixedly connected to a fixing frame (12). A scraper plate (13) is fixedly connected inside the fixing frame (12), and a second threaded rod (25) is rotatably connected inside the moving groove (24), and the second threaded rod (25) is threadedly connected to the slider (26).

10. A production process for multi-stage grinding of magnetic powder integrating online magnetic separation function, characterized in that, Includes the following steps: S1. By using the lifting slide rail (8) on the base plate (1), the first threaded rod (17) and the threaded seat (16) to drive the overall height of the crushing bucket (6) so that the discharge pipe (20) is inserted into the feed port of the ball mill (5); put the magnetic powder raw material to be processed into the crushing bucket (6), start the two crushing rollers (21) symmetrically installed inside the crushing bucket (6) to crush and refine the blocky and granular magnetic powder raw material. During the fall of the crushed magnetic powder material, it passes through the frame (22) area below the crushing bucket (6). The magnetic field generated by the multiple permanent magnet rods (28) evenly arranged inside the frame (22) uses the medium and low field strength to intercept hard large iron debris such as iron blocks, steel chips, and equipment wear iron slag. After crushing, the material discharge channel is opened by flipping the flap (23) inside the discharge pipe (20) so that the crushed magnetic powder material falls into the ball mill (5). S2. Start the ball mill (5) to perform fine ball milling on the initially crushed magnetic powder particles to reduce the particle size. After the magnetic powder is ground twice, it will automatically fall onto the conveyor belt (11) through the guide plate (9). The scraper plate (13) will scrape and level the material on the surface of the conveyor belt (11). The permanent magnet block (42) is fixed, the outer cylinder (43) rotates, and a stable strong magnetic field is formed on the surface of the outer cylinder (43). The ferromagnetic magnetic powder is firmly attracted to the outer cylinder (43) by the magnetic field and rotates with the outer cylinder (43). Non-magnetic impurities are separated along the conveyor belt (11). When the outer cylinder (43) moves to the non-magnetic area, the magnetic field suddenly disappears and the magnetic powder automatically falls into the collection hopper (40). S3. The material is transported to the inside of the air mill (3) through the feed pipe (41) at the output end of the collection hopper (40). The air compressor (14) and the air storage tank (15) on the bottom plate (1) are started simultaneously to provide a stable high-pressure airflow for the air mill (3). The air is evenly distributed by the air supply ring (4) on the outer wall of the air mill (3). The magnetic powder after ball milling is ground by high-pressure airflow. The magnetic powder processed by the air mill (3) is screened by its internal grading wheel. The qualified fine powder enters the cyclone separator (2) with the airflow. The coarse powder automatically falls back and collides and grinds again. Through the centrifugal grading principle of the cyclone separator (2), the magnetic powder of different particle sizes is graded and screened. The fine magnetic powder of qualified particle size is collected.

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