Magnetic circuit structure of belt type permanent magnet separator roller

Abstract

The invention discloses a magnetic circuit structure of a belt type permanent magnet separator roller, and relates to the technical field of magnetic circuit parts, the magnetic circuit structure comprises a main shaft and two sealing plates fixedly connected to the outer side of the main shaft, the outer sides of the two sealing plates are provided with a roller body, the main shaft, the roller body and the sealing plates form the roller, and the main shaft is driven by a motor. Through cooperation of parts such as a keel frame and the like, when the magnetic circuit structure of the belt type permanent magnet separator roller is produced, the diameter of an inner circle is calculated in a circumferential arrangement mode through the thickness and the superposition number of single magnets, and then a polygon with the diameter of the inner circle as the vertex is arranged according to the volume of the magnets, so that the magnetic circuit structure of the belt type permanent magnet separator roller is obtained. An annular framework composed of a plurality of keel frames is used as a support of the keel, so that distributed magnets form a neat array of N rows and N columns, every two magnets close to each other extend towards the outer circle with the minimum gap, the gap between every two magnets is reduced to the maximum extent, the magnets are attached to the outer circle of a cylinder to the maximum extent, and therefore the effect that the magnets are attached to the outer circle of the cylinder is achieved. The assembled structure greatly increases the magnetic force on the surface of the permanent magnet roller, and the separation efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of magnetic circuit components technology, specifically a magnetic circuit structure for a belt-type permanent magnet separator roller. Background Technology

[0002] Against the backdrop of accelerating global industrialization, the generation of solid waste has increased dramatically. Many combined heat and power (CHP) plants utilize coal coupled with general solid waste (industrial combustible waste, municipal sludge, industrial sludge, construction waste, agricultural and forestry waste, etc.) for harmless and resource-based incineration. Currently, most industrial solid waste disposal projects use belt conveyors to complete the entire process of feeding, crushing, sorting, magnetic separation, homogenization, and transportation to co-incineration. Since the solid waste mainly consists of waste scraps from manufacturing enterprises such as clothing, bags, and shoes, it often contains small amounts of hard impurities such as metals. Metals can cause significant damage to crushing and boilers, making the magnetic separation stage crucial. The detection, sorting, separation, homogenization, and transportation of metals allow for the separation of metals within materials of varying volumes, preventing potentially harmful metals from damaging downstream equipment, extending equipment lifespan, and ensuring stable and reliable operation. Iron removal equipment serves as a vital line of defense. Permanent magnet rollers play a crucial role in iron removal equipment.

[0003] There are various methods for making magnetic rollers on the market. The common forms are that the magnets are arranged far apart, the magnetic lines of force are not continuous, the magnets are large, and the distance between the cylinder wall and the magnetic blocks is far. Due to the blocking effect of the cylinder material on the magnetic field, the cylinder wall thickness is often only 2-3mm and the surface is relatively smooth. As a result, it is difficult to meet the driving force required for the start-up and transportation of belt conveyors. To address these issues, we provide a magnetic circuit structure for the roller of a belt permanent magnet separator. Summary of the Invention

[0004] The purpose of this invention is to provide a magnetic circuit structure for the roller of a belt permanent magnet separator in order to solve the problems of existing roller magnets being arranged far apart, having discontinuous magnetic lines of force, large magnet sizes, and a large distance between the roller wall and the magnetic blocks.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a magnetic circuit structure for a belt-type permanent magnet separator roller, comprising: a main shaft and two sealing plates fixedly connected to the outside of the main shaft, a cylinder being installed on the outside of the two sealing plates, the main shaft, the cylinder, and the sealing plates forming a roller, the main shaft being driven by a motor; a support ring, wherein multiple support rings are provided, the multiple support rings being fixedly connected to the outer wall of the main shaft, and the support rings being polygonal; a keel frame, wherein multiple keel frames are provided, each of the multiple keel frames being fixedly connected to the support rings, and the multiple keel frames being evenly distributed around the outer wall of the support rings; magnets, wherein multiple magnets are provided, the multiple magnets being evenly distributed at the top of the keel frames, and the magnetic induction lines of the multiple magnets being composed of N and S respectively, and the magnetic induction lines of the multiple magnets being arranged in a cross-combination manner; and a tensioning auxiliary device, located at the bottom of the main shaft and the magnets, used to assist in the installation of the magnets.

[0006] As a further embodiment of the present invention: the magnet is composed of two strong magnets and two ordinary magnets, and the two strong magnets and the two ordinary magnets are stacked alternately in pairs.

[0007] As a further embodiment of the present invention: the tensioning auxiliary device includes multiple traction blocks slidably connected to the top of the keel frame, and each traction block is correspondingly disposed at the bottom of one of the magnets. A fixing plate is fixedly connected to the top of the keel frame. Multiple rotating sleeves are rotatably connected to the outer wall of the main shaft. Each rotating sleeve is disposed between two support rings. One end of the traction block is fixedly connected to a steel wire rope, and one end of the steel wire rope passes through the outside of the keel frame and is fixedly connected to the rotating sleeve. A power spring is installed between the traction block and the fixing plate. A drive assembly for driving the rotating sleeve to rotate is disposed between each support ring and one of the rotating sleeves.

[0008] As a further embodiment of the present invention: the driving assembly includes a spur gear ring fixedly connected to the outer wall of the rotating sleeve, a driving motor is installed on one side of the support ring, and a spur gear meshing with the spur gear ring is fixedly connected to the output end of the driving motor.

[0009] As a further embodiment of the present invention: a guide roller is rotatably connected to the top of the keel frame, and the wire rope is attached to the top of the guide roller; a fixing frame is fixedly connected to the bottom of the keel frame; a guide wheel is rotatably connected to the inner side of the fixing frame, and the guide wheel is disposed on the side of the wire rope.

[0010] As a further embodiment of the present invention: the tensioning aid further includes a movable block slidably connected to the inner side of the traction block, and an auxiliary spring is installed between the movable block and the traction block.

[0011] As a further embodiment of the present invention: a docking plate is fixedly connected to the top of the movable block, and a plug groove matching the docking plate is opened at the bottom of one of the magnets, and a threaded groove communicating with the plug groove is opened at one end of the magnet, and the magnet is fixedly connected to the docking plate by bolts.

[0012] As a further embodiment of the present invention: both sides of the moving block and the traction block are fixedly connected to limit blocks, and the inner side of the traction block and the keel frame are provided with limit grooves that match the limit blocks. The moving block is slidably connected to the traction block through the limit blocks fixedly connected to both sides, and the traction block is slidably connected to the keel frame through the limit blocks fixedly connected to both sides.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting up the keel frame and other parts, firstly, when producing the magnetic circuit structure of the belt permanent magnet separator roller, the diameter of the inner circle is calculated by the thickness of a single magnet, the number of stacked magnets, and the arrangement in a circumferential manner. Then, the volume of the magnets is arranged into a polygon with the inner circle diameter as the vertex. The ring frame composed of multiple keel frames serves as the support of the keel, so that the distributed magnets form a neat array of N rows and N columns. Each pair of magnets that are close to each other extends outward with the smallest gap, minimizing the gap between each pair of magnets and making the magnets as close as possible to the outer circle of the cylinder. This greatly increases the magnetic force on the surface of the permanent magnet roller after assembly, thus improving the separation efficiency. 2. By setting up the cooperation of parts such as magnets, the external magnetic induction lines are composed of N and S. The characteristics of the magnetic field cause the bipolar magnets to interact with each other. Each pair of magnets that are close to each other attracts or repels each other. In the traditional manufacturing of permanent magnet rollers, magnets of the same polarity are arranged. Magnets that are all N or all S are easy to assemble, but the magnetic induction lines do not intersect, and the magnetic field in the gap between each pair of magnets is almost zero. At present, we have adopted an N and S cross combination arrangement, so that the magnetic induction lines form a closed line between each row and each column, which greatly increases the density of magnetic induction lines. This significantly increases the magnetic force on the surface of the permanent magnet roller and forms a complete magnetic field induction circle, which is more conducive to the adsorption of metal. 3. By combining strong and ordinary magnetic fields, magnets can be categorized into two types: strong and ordinary. Strong magnetic fields typically have a surface magnetic field of 3500-5000 Gauss, while ordinary magnetic fields range from 200-500 Gauss. Generally speaking, the larger the magnet's volume, the stronger the magnetic field it produces after magnetization. However, the price difference between strong and ordinary magnets is significant. It's necessary to consider both maximizing magnetic field strength and market acceptance. Traditionally, a layer of strong magnetic field is layered with three layers of ordinary magnetic field. This layering of ordinary magnetic field increases the Gaussian magnetic field to a certain extent. On the right, due to the thickness of the four layers, the inner circle of the keel where the magnets are installed becomes smaller. This makes it difficult for the gaps between each column of magnets to form a complete closed magnetic field line on the surface of the permanent magnet roller when the four layers of magnets are arranged to the outer edge of the circle. Therefore, this solution has been improved by using a method of superimposing a strong magnet and a general magnet. The superimposed general magnet increases the magnetic field of the strong magnet surface by about Gauss and avoids the loss of the magnetic field of the strong magnet bottom layer. It can make the inner circle of the keel as large as possible, so that the gaps between each column of magnets are smaller, thereby forming a complete closed magnetic field. 4. By setting a tensioning auxiliary device, during the assembly of the magnets, first, a group of magnets is fixedly installed in a ring on the keel frame. The insertion slots at the bottom of the magnets can be aligned with the connecting plate, and then the two are fixed with bolts. This longitudinal arrangement is continued until only the last group of ring-shaped magnets remains uninstalled. Then, multiple drive motors are activated, each driving a spur gear to rotate. This drives the spur gear ring to rotate the rotating sleeve, which in turn pulls on a steel cable, causing it to move closer to the guide wheel. This pulls the traction block, causing the magnets to move closer to the previous magnet. When the magnets encounter resistance, the traction block continues to move, causing the moving block to slide relative to the traction block. This ensures that all longitudinally arranged magnets can move closer to the previous magnet, allowing them to fit tightly together in pairs. Finally, the last group of magnets is installed. After the longitudinal magnets are tightened and fitted together, the longitudinal gap between adjacent magnets is minimized, preventing the magnetic field lines from being interrupted at the gaps, thus creating a "N / S cross arrangement forming closed magnetic field lines". The design, with its smaller gaps, allows for more continuous longitudinal magnetic field lines, further increasing the magnetic field density on the roller surface. This enhances the overall magnetic field strength and improves the attraction to metals, especially significantly enhancing the ability to capture small, weakly magnetic metals. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle; Figure 4This is a schematic diagram of the keel frame structure of the present invention; Figure 5 This is a schematic diagram of the inner structure of the keel frame of the present invention; Figure 6 This is a schematic diagram of the strong magnetic and ordinary magnetic stacking of the present invention; Figure 7 For the present invention Figure 6 Enlarged view at point B in the middle; Figure 8 This is a schematic diagram of the connection between the magnet and the keel frame of the present invention; Figure 9 For the present invention Figure 8 Enlarged view at point C; Figure 10 These are explosion diagrams of strong and general magnetic fields of the present invention; Figure 11 This is a schematic diagram of the N and S magnetic induction lines of multiple magnets of the present invention arranged in a cross-combination.

[0015] In the diagram: 1. Main shaft; 2. Cylinder; 3. Sealing plate; 4. Spur gear ring; 5. Rotating sleeve; 6. Support ring; 7. Magnet; 71. Strong magnet; 72. Ordinary magnet; 8. Steel wire rope; 9. Drive motor; 10. Spur gear; 11. Keel frame; 12. Connecting groove; 13. Bolt; 14. Connecting plate; 15. Traction block; 16. Auxiliary spring; 17. Moving block; 18. Power spring; 19. Guide roller; 20. Guide wheel; 21. Fixing frame; 22. Fixing plate; 23. Threaded groove; 24. Insertion groove; 25. L-shaped insertion block. Detailed Implementation

[0016] 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.

[0017] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0018] Please see Figures 1 to 11 This embodiment provides a magnetic circuit structure for a belt permanent magnet separator roller, including: a main shaft 1 and two sealing plates 3 fixedly connected to the outside of the main shaft 1, a cylinder 2 installed on the outside of the two sealing plates 3, the main shaft 1, the cylinder 2 and the sealing plates 3 forming a roller, the main shaft 1 being driven by a motor; a support ring 6, multiple support rings 6 being provided, multiple support rings 6 being fixedly connected to the outer wall of the main shaft 1, and the support ring 6 being polygonal; a keel frame 11, multiple keel frames 11 being provided, multiple keel frames 11 being fixedly connected to the support rings 6, and multiple keel frames 11 being distributed at equal distances around the outer wall of the support rings 6; magnets 7, multiple magnets 7 being provided, multiple magnets 7 being distributed at equal distances on the top of the keel frame 11, and the magnetic induction lines of the multiple magnets 7 being composed of N and S respectively, and the magnetic induction lines of the multiple magnets 7 being arranged in a cross-combination manner; the magnet 7 being composed of two strong magnets 71 and two ordinary magnets 72, and the two strong magnets 71 and two ordinary magnets 72 being stacked alternately in pairs; Each of the two strong magnets 71 and one of the ordinary magnets 72 is fixedly connected to an L-shaped plug-in block 25 on one side. Each of the two ordinary magnets 72 and one of the strong magnets 71 has a mating groove 12 that matches the L-shaped plug-in block 25 on one side. The two strong magnets 71 and the two ordinary magnets 72 are stacked and installed on each other by the L-shaped plug-in block 25 and the mating groove 12, so that the workers can assemble the two strong magnets 71 and the two ordinary magnets 72. First, when producing the magnetic circuit structure of the belt permanent magnet separator roller, the diameter of the inner circle is calculated by the thickness of a single magnet 7 and the number of stacked magnets in a circumferential arrangement. Then, the volume of the magnets 7 is arranged into a polygon with the inner circle diameter as the vertex. A ring frame composed of multiple keel frames 11 is used as the support of the keel (the traditional frame is circular, while this solution is polygonal). This makes the distributed magnets 7 form a neat array of N rows and N columns. Each pair of magnets 7 that are close to each other extends outward with the smallest gap, minimizing the gap between each pair of magnets 7. This makes the magnets 7 as close as possible to the outer circle of the cylinder 2, which greatly increases the magnetic force on the surface of the permanent magnet roller after assembly. The external magnetic field lines are composed of N and S. The characteristics of the magnetic field cause the bipolar magnets to interact. Each pair of magnets 7 that are close to each other attracts or repels each other. In the traditional manufacturing of permanent magnet rollers, magnets 7 of the same polarity are arranged. Magnets 7 that are all N or all S are easy to assemble, but the magnetic field lines do not intersect, and the magnetic field in the gap between each pair of magnets 7 is almost zero. At present, we have adopted an N and S cross combination arrangement, so that the magnetic field lines form a closed line between each row and each column, which greatly increases the density of the magnetic field lines. This significantly increases the magnetic force on the surface of the permanent magnet roller and forms a complete magnetic field induction circle, which is more conducive to the adsorption of metal. The selection of magnet 7 is a core technology in the manufacture of permanent magnet rollers. Magnet 7 can be divided into two types: strong magnet 71 and ordinary magnet 72. Typically, the magnetic field on the surface of strong magnet 71 ranges from 3500-5000 Gauss, while that of ordinary magnet 72 ranges from 200-500 Gauss. Generally speaking, the larger the volume of magnet 7, the stronger the magnetic field it produces after magnetization. However, the price difference between strong magnet 71 and ordinary magnet 72 is significant. It is necessary to consider both maximizing magnetic field strength and market acceptance of price. The traditional approach is to stack three layers of ordinary magnet 72 under one layer of strong magnet 71. This stacking of three layers of ordinary magnet 72 increases the magnetic field strength to a certain extent. The magnetic field strength is around 300 Gauss. However, due to the thickness of the four layers, the inner circle of the keel where the magnets 7 are installed becomes smaller. This makes it difficult for the gaps between each column of magnets 7 to form a complete closed magnetic field line on the surface of the permanent magnet roller when the four layers of magnets 7 are arranged to the outer edge of the circle. Therefore, this solution has been improved by using a method of superimposing a strong magnet 71 with a general magnet 72. The superimposed general magnet 72 increases the magnetic field of the strong magnet surface by about 200 Gauss and avoids the loss of the magnetic field of the bottom layer of strong magnet 71. It can make the inner circle of the keel as large as possible, so that the gaps between each column of magnets 7 are smaller, thereby forming a complete closed magnetic field. For permanent magnet rollers, distance determines magnetic field strength. Since magnets 7 are rectangular or square, previous methods involved slight tilting during assembly at the sharp corners, making it difficult to align magnets 7 in a neat circle. This resulted in varying degrees of suspension within the stainless steel cylinder 2. The greater the suspension distance between the cylinder 2 and the magnets 7, the weaker the magnetic field strength on the surface of the cylinder 2. Our current method uses a polygonal frame 11, with the mounting bracket dimensions perfectly matching the magnets 7. The sharp corners of the magnets 7 are neatly aligned. After assembly, the gap between the cylinder 2 and the magnets 7 is approximately 1mm, maximizing the magnetic field strength on the surface of the permanent magnet roller. Even with a thicker material layer, it can still attract metal from distant locations, reducing missed metals. This further minimizes damage to downstream processing equipment and ensures stable operation of the co-firing process.

[0019] Please see Figures 2 to 10 The tensioning auxiliary device includes multiple traction blocks 15 slidably connected to the top of the keel frame 11, and each traction block 15 is correspondingly set at the bottom of a general magnet 72. A fixing plate 22 is fixedly connected to the top of the keel frame 11. Multiple rotating sleeves 5 are rotatably connected to the outer wall of the main shaft 1. Each rotating sleeve 5 is provided between two support rings 6. One end of the traction block 15 is fixedly connected to a steel wire rope 8, and one end of the steel wire rope 8 passes through the outside of the keel frame 11 and is fixedly connected to the rotating sleeve 5. A power spring 18 is installed between the traction block 15 and the fixing plate 22. A drive assembly for driving the rotating sleeve 5 to rotate is provided between each support ring 6 and a rotating sleeve 5. The drive assembly includes a spur gear ring 4 fixedly connected to the outer wall of the rotating sleeve 5. A drive motor 9 is installed on one side of the support ring 6. A spur gear 10 that meshes with the spur gear ring 4 is fixedly connected to the output end of the drive motor 9. A guide roller 19 is rotatably connected to the top of the keel frame 11, and the steel wire rope 8 is attached to the outer wall of the rotating sleeve 5. A fixed frame 21 is fixedly connected to the top of the guide roller 19 and the bottom of the keel frame 11. A guide wheel 20 is rotatably connected to the inner side of the fixed frame 21, and the guide wheel 20 is set on the side of the wire rope 8. The tensioning auxiliary device also includes a moving block 17 slidably connected to the inner side of the traction block 15. An auxiliary spring 16 is installed between the moving block 17 and the traction block 15. A docking plate 14 is fixedly connected to the top of the moving block 17. One of the ordinary magnets 72 has a plug groove 24 that matches the docking plate 14 at its bottom. One end of the ordinary magnet 72 has a threaded groove 23 that communicates with the plug groove 24. The ordinary magnet 72 is fixedly connected to the docking plate 14 by bolts 13. Limiting blocks are fixedly connected to both sides of the moving block 17 and the traction block 15. A limiting slide groove that matches the limiting block is opened on the inner side of the traction block 15 and the keel frame 11. The moving block 17 is slidably connected to the traction block 15 through the limiting blocks fixedly connected to both sides. The traction block 15 is slidably connected to the keel frame 11 through the limiting blocks fixedly connected to both sides. When assembling the magnets 7, first, a set of magnets 7 is fixedly installed in a ring on the keel frame 11. The insertion slot 24 at the bottom of the ordinary magnet 72 can be connected to the docking plate 14, and then the two are fixed with bolts 13. This process is repeated longitudinally until only the last set of ring-shaped magnets 7 remains uninstalled. Then, multiple drive motors 9 are started, each drive motor 9 driving a spur gear 10 to rotate. This drives the spur gear ring 4 to rotate the rotating sleeve 5, thereby pulling on a steel wire rope 8, causing the steel wire rope 8 to move towards the guide wheel. The magnets 72 are brought closer together in the 20 direction, which in turn pulls the traction block 15 to bring the magnets 72 closer together in the direction of the next magnet 72. When the magnets 72 encounter resistance, the traction block 15 will continue to move, causing the moving block 17 to slide relative to the traction block 15. This allows the longitudinally arranged magnets 72 to be brought closer together in the direction of the next magnet 72, so that the magnets 7 can be tightly attached to each other in pairs during installation. Then the last set of magnets 7 is installed tightly. After the longitudinal magnets 7 are tightened and attached, the longitudinal gap between adjacent magnets 7 can be minimized to avoid the magnetic field lines being interrupted at the gap. This makes the design of "N / S cross arrangement to form closed magnetic field lines" more effective. The smaller gap makes the longitudinal magnetic field lines more continuous, further increasing the magnetic field line density on the roller surface, thereby enhancing the overall magnetic field strength and improving the adsorption force on metals, especially significantly enhancing the capture ability of small-volume, weakly magnetic metals. When each magnet 7 is pressed together, the rotating sleeve 5 does not rotate much, but only rotates a few degrees to create a tension space so that each pair of magnets 7 can be pressed together.

[0020] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A magnetic circuit structure for a belt-type permanent magnet separator roller, characterized in that, include: A main shaft (1) and two sealing plates (3) fixedly connected to the outside of the main shaft (1). A cylinder (2) is installed on the outside of the two sealing plates (3). The main shaft (1), the cylinder (2) and the sealing plates (3) form a roller. The main shaft (1) is driven by a motor. Support ring (6), multiple support rings (6) are provided, multiple support rings (6) are fixedly connected to the outer wall of the main shaft (1), and the support rings (6) are polygonal; A keel frame (11) is provided in multiple ways. All of the multiple keel frames (11) are fixedly connected to the support ring (6), and the multiple keel frames (11) are distributed at equal distances around the outer wall of the support ring (6). Magnet (7), multiple magnets (7) are provided, multiple magnets (7) are distributed at equal distances on the top of the keel frame (11), and the magnetic induction lines of multiple magnets (7) are composed of N and S respectively, and the magnetic induction lines N and S of multiple magnets (7) are arranged in a cross combination manner; A tensioning aid is located at the bottom of the main shaft (1) and the magnet (7) to assist the magnet (7) in installation.

2. The magnetic circuit structure of the belt-type permanent magnet separator roller according to claim 1, characterized in that, The magnet (7) consists of two strong magnets (71) and two ordinary magnets (72), and the two strong magnets (71) and the two ordinary magnets (72) are stacked alternately in pairs.

3. The magnetic circuit structure of the belt-type permanent magnet separator roller according to claim 2, characterized in that, One side of each of the two strong magnets (71) and one of the ordinary magnets (72) is fixedly connected to an L-shaped plug block (25). One side of each of the two ordinary magnets (72) and one of the strong magnets (71) is provided with a mating groove (12) that matches the L-shaped plug block (25). The two strong magnets (71) and the two ordinary magnets (72) are stacked and installed on each other through the L-shaped plug block (25) and the mating groove (12).

4. The magnetic circuit structure of the belt-type permanent magnet separator roller according to claim 2, characterized in that, The tensioning aid includes multiple traction blocks (15) slidably connected to the top of the keel frame (11), and each traction block (15) is correspondingly set at the bottom of a magnet (72). A fixing plate (22) is fixedly connected to the top of the keel frame (11). Multiple rotating sleeves (5) are rotatably connected to the outer wall of the main shaft (1). Each rotating sleeve (5) is provided between two support rings (6). One end of the traction block (15) is fixedly connected to a wire rope (8), and one end of the wire rope (8) passes through the outside of the keel frame (11) and is fixedly connected to the rotating sleeve (5). A power spring (18) is installed between the traction block (15) and the fixing plate (22). A drive component for driving the rotating sleeve (5) to rotate is provided between each support ring (6) and a rotating sleeve (5).

5. The magnetic circuit structure of the belt-type permanent magnet separator roller according to claim 4, characterized in that, The drive assembly includes a spur gear ring (4) fixedly connected to the outer wall of the rotating sleeve (5), a drive motor (9) is installed on one side of the support ring (6), and a spur gear (10) meshing with the spur gear ring (4) is fixedly connected to the output end of the drive motor (9).

6. The magnetic circuit structure of the belt-type permanent magnet separator roller according to claim 4, characterized in that, The top of the keel frame (11) is rotatably connected to a guide roller (19), and the wire rope (8) is attached to the top of the guide roller (19). The bottom of the keel frame (11) is fixedly connected to a fixing frame (21), and the inner side of the fixing frame (21) is rotatably connected to a guide wheel (20), and the guide wheel (20) is located on the side of the wire rope (8).

7. The magnetic circuit structure of the belt-type permanent magnet separator roller according to claim 4, characterized in that, The tensioning aid also includes a movable block (17) slidably connected to the inside of the traction block (15), and an auxiliary spring (16) is installed between the movable block (17) and the traction block (15).

8. The magnetic circuit structure of the belt-type permanent magnet separator roller according to claim 7, characterized in that, The top of the movable block (17) is fixedly connected to a docking plate (14), and the bottom of one of the magnets (72) is provided with a plug groove (24) that matches the docking plate (14). One end of the magnet (72) is provided with a threaded groove (23) that communicates with the plug groove (24). The magnet (72) is fixedly connected to the docking plate (14) by bolts (13).

9. The magnetic circuit structure of the belt-type permanent magnet separator roller according to claim 7, characterized in that, Both sides of the moving block (17) and the traction block (15) are fixedly connected to limit blocks. The traction block (15) and the inner side of the keel frame (11) are provided with limit sliding grooves that match the limit blocks. The moving block (17) is slidably connected to the traction block (15) through the limit blocks fixedly connected to both sides. The traction block (15) is slidably connected to the keel frame (11) through the limit blocks fixedly connected to both sides.

Images