Permanent magnet dry magnetic separator

Abstract

The invention relates to a permanent magnet dry magnetic separator which comprises a machine base, a support is arranged on the machine base, a conveying belt located in the support is arranged on the machine base, a driving motor is arranged above the support, an output shaft of the driving motor is provided with an annular disc located above the conveying belt, and a magnetic gathering disc is fixedly connected to the lower portion of the annular disc. A plurality of first magnetism gathering medium monomers facing the conveying belt are arranged on the magnetism gathering disc in the circumferential direction at equal intervals, first magnetic steel and second magnetic steel are sequentially arranged on the support in the conveying direction of the conveying belt and located in the middle of the conveying belt, and the width of the first magnetic steel is matched with the width of the conveying belt. The width of the second magnetic steel is smaller than that of the conveying belt. Magnetic separation is completed twice before and after materials, loss of magnetic substances can be reduced, and the magnetic separation effect is improved.

Description

Technical Field

[0001] The present application relates to the technical field of mineral processing equipment, and in particular to a permanent magnet dry magnetic separator. Background Art

[0002] Manganese is an important basic material and strategic resource for national economic and social development. It is widely used in the steel industry, non-ferrous metallurgy, batteries, magnetic material processing and chemical industry. my country has large reserves of manganese carbonate ore, but it has the characteristics of low manganese grade and fine mineral embedding particle size. Directly used for electrolytic production of metallic manganese, it produces a large amount of slag and poor economic benefits.

[0003] The dry magnetic separator is mainly used to separate magnetic materials and non-magnetic materials from solid materials, remove non-magnetic materials in ore materials, improve the purity of magnetic materials, and reduce the production and cost pressure of the next production process. Traditional dry magnetic separators usually adopt the structural design of a single magnetic separation roller. Its working principle is to evenly transport the ore powder to be separated to the working area of ​​the magnetic separation roller through a feeding device. Around the magnetic separation roller, the magnetic field generated by the permanent magnet generates an attraction for the magnetic particles in the ore powder, causing the magnetic particles to adhere to the surface of the magnetic separation roller and be carried out as the magnetic separation roller rotates. The non-magnetic particles are discharged from the discharge port of the magnetic separator under the action of centrifugal force and gravity, thereby realizing the separation of magnetic and non-magnetic minerals.

[0004] During the magnetic separation process, the residence time of mineral powder in the magnetic separation area is limited. Since there is only one magnetic separation roller, the contact time between the mineral powder and the magnetic field is short when passing through the magnetic separation roller. The magnetic particles are carried away from the magnetic separation area before they have time to fully respond to the action of the magnetic field, resulting in incomplete magnetic separation of the mineral powder. Summary of the Invention

[0005] In order to improve the magnetic separation effect of mineral powder, the present application provides a permanent magnet dry magnetic separator.

[0006] The present application provides a permanent magnetic dry separator, which adopts the following technical solution:

[0007] A permanent magnetic dry magnetic separator includes a machine base, a support is provided on the machine base, a conveyor belt located in the support is provided on the machine base, a drive motor is provided above the support, and the output shaft of the drive motor is provided with a circular ring disk located above the conveyor belt, a magnetic focusing disk is fixedly connected below the circular ring disk, and the magnetic focusing disk is provided with a number of first magnetic focusing medium monomers facing the conveyor belt at equal intervals along the circumference, and a first magnetic steel and a second magnetic steel are sequentially provided on the support along the conveying direction of the conveyor belt, the first magnetic steel and the second magnetic steel are both located in the middle position of the conveyor belt, the width of the first magnetic steel matches the width of the conveyor belt, and the width of the second magnetic steel is smaller than the width of the conveyor belt.

[0008] Optionally, parallel first guide plates are provided on both sides above the conveyor belt, and two parallel second guide plates are provided in the middle position of the conveyor belt, the distance between the two second guide plates matches the width of the second magnetic steel, the end of the second guide plate is located above the end of the first magnetic steel close to the conveyor belt output direction, the end of the first guide plate is located above the end of the first magnetic steel close to the conveyor belt input direction, a third guide plate is provided between the first guide plate and the second guide plate close to the conveyor belt input direction end, a magnetic material channel is formed between the first guide plate and the adjacent second guide plate, and a non-magnetic material channel is formed between the two second guide plates.

[0009] Optionally, the support is provided with an auxiliary unloading component located above the non-magnetic material channel, the auxiliary unloading component includes an air pump and an air outlet nozzle, the air pump is installed below the support, the air outlet nozzle is connected to the air pump, and the air outlet nozzle is facing the first magnetic medium monomer.

[0010] Optionally, a flat material assembly is provided on the two first guide plates, and the flat material assembly is located at the first magnetic steel near the conveying end of the conveyor belt. The flat material assembly includes a flat material plate, a lifting screw and a lifting guide rod. The lifting screw is rotatably connected to one of the first guide plates, and the lifting guide rod is fixedly connected to the other first guide plate. Lifting blocks are provided on both sides of the flat material plate, the lifting screw is threadedly connected to one lifting block, and the lifting guide rod is slidingly connected to the other lifting block.

[0011] Optionally, the annular disk is provided with an annular sleeve located above the magnetic focusing disk, the annular sleeve is provided with an electric cylinder, the electric cylinder output shaft is provided with a connecting ring, a number of second magnetic focusing medium monomers are circumferentially equidistantly arranged below the connecting ring, and the magnetic focusing disk is provided with a number of mounting sockets located in the middle of the first magnetic focusing medium monomers, and the several mounting sockets correspond one-to-one to the second magnetic focusing medium monomers.

[0012] Optionally, an annular positioning plate is provided above the magnetic focusing disc, the annular positioning plate is provided with a passing slot for the second magnetic focusing medium unit to pass through, and an extrusion spring sleeved on the second magnetic focusing medium unit is provided between the connecting ring and the annular positioning plate.

[0013] Optionally, a guide groove communicating with the mounting socket is provided on the magnetic concentrating disc, and a guide block located in the guide groove is provided on the second magnetic concentrating medium monomer.

[0014] Optionally, a feeder is provided above the support and located above the conveyor belt. The feeder includes a feeding hopper, a feeding channel and a feeding valve. The feeding channel is connected to the bottom end of the feeding hopper, and the feeding valve is installed in the feeding channel.

[0015] Optionally, the machine base is provided with three lower hoppers located below one end of the conveyor belt output, and the three lower hoppers correspond one-to-one to two magnetic material channels and one non-magnetic material channel.

[0016] In summary, this application includes at least one of the following beneficial technical effects:

[0017] 1. A separation zone is formed between the magnetic concentrating disc and the first and second magnetic steels. When the material passes through the area where the first magnetic steel is located, the magnetic material in the material is captured by the induced magnetic field generated by the first magnetic concentrating medium monomer and accelerated to the cone tip of the first magnetic concentrating medium monomer. As the magnetic concentrating disc continues to rotate, when the first magnetic concentrating medium monomer moves to the upper area where there are no first and second magnetic steels, the magnetic material adsorbed at the cone tip of the first magnetic concentrating medium monomer falls onto the conveyor belt and is conveyed along the conveyor belt along a different path from the non-magnetic material in the middle of the conveyor belt. Subsequently, when the first magnetic concentrating medium monomer rotates above the area where the second magnetic steel is located, the material that has been separated once is separated again, and the remaining magnetic material in the material can be further recovered. The material completes two magnetic separations, which can reduce the loss of magnetic material.

[0018] 2. The material on the conveyor belt is spread out by the flat material component to improve the separation efficiency of magnetic materials in the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of Example 1.

[0020] Figure 2 It is a schematic diagram for showing the connection relationship between the annular disk and the magnetic focusing disk in Example 1.

[0021] Figure 3 yes Figure 2 Enlarged schematic diagram of part A.

[0022] Figure 4 It is a schematic diagram used to show the magnetic induction intensity between the magnetic disk and the magnet.

[0023] Figure 5 It is a schematic diagram for showing the structure of the auxiliary blanking component in Example 1.

[0024] Figure 6 It is a schematic diagram of the overall structure of Example 2.

[0025] Figure 7 It is a schematic diagram for showing the structure of the flat material component in Example 2.

[0026] Explanation of the accompanying symbols: 1. Machine base; 11. Lower hopper; 2. Support; 21. Drive motor; 22. Support substrate; 23. Magnetic substrate; 24. Magnetic disk; 25. First magnetic steel; 26. Second magnetic steel; 3. Feeder; 31. Feed hopper; 32. Feeding channel; 4. Annular disk; 5. Magnetic focusing disk; 51. First magnetic focusing medium monomer; 52. Mounting socket; 53. Annular positioning plate; 531. Through slot; 54. Guide groove; 6. Conveyor belt ;61. First guide plate;62. Second guide plate;63. Third guide plate;7. Flat material assembly;71. Flat material plate;711. Lifting block;72. Lifting screw;73. Lifting guide rod;74. Working motor;8. Annular sleeve;81. Electric cylinder;82. Connecting ring;83. Second magnetic medium monomer;831. Extrusion spring;832. Guide block;9. Auxiliary unloading assembly;91. Air pump;92. Air outlet nozzle;93. Air supply channel. DETAILED DESCRIPTION

[0027] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0028] Example 1:

[0029] The embodiment of the present application discloses a permanent magnet dry magnetic separator.

[0030] Reference Figure 1 A permanent magnetic dry magnetic separator includes a base 1, a support 2 is fixedly mounted on the base 1, a conveyor belt 6 located inside the support 2 is provided on the base 1, and the material is placed on the conveyor belt 6 for transportation.

[0031] Reference Figure 1 A feeder 3 is installed above the support 2 and is located above the conveyor belt 6. The feeder 3 includes a feeding hopper 31, a feeding channel 32, and a feeding valve. The feeding channel 32 is connected to the bottom end of the feeding hopper 31, and the feeding valve is installed in the feeding channel 32. Pour the material into the feeding hopper 31, open the feeding valve as needed, and the material in the feeding hopper 31 falls onto the conveyor belt 6 under the influence of gravity.

[0032] Reference Figure 2 and Figure 3A driving motor 21 is installed above the support 2, and the output shaft of the driving motor 21 is coaxially fixedly connected to the annular disk 4 located above the conveyor belt 6. A magnetic disk 5 is fixedly connected below the annular disk 4, and the magnetic disk 5 is circumferentially equidistantly provided with a number of first magnetic medium monomers 51 facing the conveyor belt 6. The support 2 is provided with a first magnetic steel 25 and a second magnetic steel 26 in sequence along the conveying direction of the conveyor belt 6. A supporting substrate 22 located below the conveyor belt 6 is installed on the support 2, a magnetic system substrate 23 is installed on the supporting substrate 22, a magnetic disk 24 is installed on the magnetic system substrate 23, the first magnetic steel 25 and the second magnetic steel 26 are installed on the magnetic disk 24, and the magnetic disk 24 is made of soft magnetic material to guide the magnetic lines of force generated by the magnetic steel to a specified path, reduce the magnetic resistance of the magnetic circuit, improve the utilization rate of the magnetic field, and enable the magnetic field to act more effectively on the working area. The magnetic concentrating disk 5, the first magnetic steel 25 and the second magnetic steel 26 are made of N48 neodymium iron boron material, and the first magnetic concentrating medium monomer 51 is made of soft iron material with a taper of 30 degrees.

[0033] The first magnetic steel 25 and the second magnetic steel 26 are both located in the middle of the conveyor belt 6. The width of the first magnetic steel 25 matches the width of the conveyor belt 6. The width of the second magnetic steel 26 is smaller than the width of the conveyor belt 6. A first separation zone is formed between the magnetic disk 5 and the first magnetic steel 25, and a second separation zone is formed between the magnetic disk 5 and the second magnetic steel 26. Figure 4 Used to demonstrate the magnetic induction intensity between the magnetic focusing disk 5 and the first magnetic steel 25.

[0034] When the material is conveyed through the conveyor belt 6, the drive motor 21 is started, and the output shaft of the drive motor 21 drives the annular disk 4 to rotate, so that the magnetic disk 5 rotates. When the material passes through the first sorting area, the magnetic material in the material is captured by the induced magnetic field generated by the first magnetic medium monomer 51 and accelerated to move toward the cone tip of the first magnetic medium monomer 51. The magnetic disk 5 continues to rotate. When the first magnetic medium monomer 51 moves to the non-first sorting area and the second sorting area, the magnetic material adsorbed at the cone tip of the first magnetic medium monomer 51 falls onto the conveyor belt 6 and is transported along the conveyor belt 6 along a different path from the non-magnetic material in the middle of the conveyor belt 6. Subsequently, when the first magnetic medium monomer 51 moves to the non-first sorting area and the second sorting area, the magnetic material adsorbed at the cone tip of the first magnetic medium monomer 51 falls onto the conveyor belt 6 and is transported along the conveyor belt 6 along a different path from the non-magnetic material in the middle of the conveyor belt 6. The medium monomer 51 rotates to above the area where the second magnetic steel 26 is located. The material that has been sorted once is sorted again. The magnetic material remaining in the material is captured by the induced magnetic field generated by the first magnetic concentrating medium monomer 51 and accelerated to the cone tip of the first magnetic concentrating medium monomer 51. The magnetic material remaining in the material can be further recovered. The material completes two magnetic sortings, which can reduce the loss of magnetic material. Subsequently, when the first magnetic concentrating medium monomer 51 moves to the non-first sorting area and the second sorting area, the magnetic material adsorbed at the cone tip of the first magnetic concentrating medium monomer 51 falls onto the conveyor belt 6, forming non-magnetic material in the middle position and magnetic material on both sides of the conveyor belt 6.

[0035] Reference Figure 1 The machine base 1 is equipped with three lower hoppers 11 located below the output end of the conveyor belt 6. The three lower hoppers 11 correspond one-to-one to two magnetic material channels and one non-magnetic material channel. The magnetic materials in the magnetic material channels on both sides fall into the lower hoppers 11 on both sides, and the non-magnetic materials in the middle fall into the lower hopper 11 in the middle, which is convenient for collecting magnetic and non-magnetic materials.

[0036] Reference Figure 2 and Figure 3 The annular disk 4 is fixedly connected to an annular sleeve 8 located above the magnetic focusing disk 5, and an electric cylinder 81 is installed on the annular sleeve 8. The output shaft of the electric cylinder 81 is provided with a connecting ring 82 located in the middle position between the annular sleeve 8 and the magnetic focusing disk 5. A plurality of second magnetic focusing medium monomers 83 are circumferentially equidistantly arranged below the connecting ring 82. The second magnetic focusing medium monomer 83 adopts a soft iron material with the same taper of 30° as the first magnetic focusing medium monomer 51.

[0037] The magnetic concentrating disc 5 is provided with a plurality of mounting sockets 52 located in the middle of the first magnetic concentrating medium monomer 51. The plurality of mounting sockets 52 correspond one-to-one to the second magnetic concentrating medium monomers 83. An annular positioning plate 53 is provided above the magnetic concentrating disc 5. The annular positioning plate 53 is provided with a passage slot 531 for the second magnetic concentrating medium monomer 83 to pass through. An extrusion spring 831 is provided between the connecting ring 82 and the annular positioning plate 53 and is sleeved on the second magnetic concentrating medium monomer 83. The magnetic concentrating disc 5 is provided with a guide groove 54 connected to the mounting socket 52. The second magnetic concentrating medium monomer 83 is provided with a guide block 832 located in the guide groove 54.

[0038] When there is a large amount of magnetic material in the material and the first magnetic medium monomer 51 cannot meet the requirements of sorting the magnetic material in the material, the electric cylinder 81 is started to extend the piston rod of the electric cylinder 81, so that the second magnetic medium monomer 83 extends from the mounting socket 52 on the magnetic disc 5. The second magnetic medium monomer 83 is spaced apart from the first magnetic medium monomer 51, thereby improving the sorting effect of the magnetic material in the material and increasing the number and density of the magnetic medium monomers in the magnetic disc 5.

[0039] Reference Figure 5 An auxiliary unloading component 9 is provided on the support 2 and is located above the non-magnetic material channel. The auxiliary unloading component 9 includes an air pump 91 and an air outlet nozzle 92. The air pump 91 is installed below the support 2. The air outlet nozzle 92 is connected to the air pump 91 through an air supply channel 93. The air outlet nozzle 92 is directed toward the first magnetic medium monomer 51 and the second magnetic medium monomer 83. Since most of the magnetic materials are magnetic powders, they have a certain adsorption capacity with the ends of the magnetic medium monomers. When the air pump 91 is started, the air outlet nozzle 92 continuously discharges air to blow off the magnetic material adhered to the ends of the magnetic medium monomers.

[0040] The implementation principle of a permanent magnetic dry magnetic separator in the embodiment of the present application is as follows: a first separation zone is formed between the magnetic disk 5 and the first magnetic steel 25, and a second separation zone is formed between the magnetic disk 5 and the second magnetic steel 26. When the material passes through the first separation zone, the magnetic substance in the material is captured by the induced magnetic field generated by the first magnetic medium monomer 51 and accelerated to move toward the cone tip of the first magnetic medium monomer 51. When the magnetic disk 5 continues to rotate, when the first magnetic medium monomer 51 moves to the non-first separation zone and the second separation zone, the magnetic substance adsorbed at the cone tip of the first magnetic medium monomer 51 falls into the magnetic substance channel. Subsequently, when the first magnetic medium monomer 51 rotates to the second magnetic steel Above the area 26, the material that has been sorted once is sorted again, and the magnetic material remaining in the material is captured by the induced magnetic field generated by the first magnetic medium monomer 51 and accelerated to the cone tip of the first magnetic medium monomer 51. The magnetic material remaining in the material can be further recovered. The material completes two magnetic sortings before and after, which can reduce the loss of magnetic material. Non-magnetic material is formed in the middle position and magnetic material is formed on both sides of the conveyor belt 6. The magnetic material in the magnetic material channels on both sides falls into the lower hoppers 11 on both sides, and the non-magnetic material in the middle falls into the lower hopper 11 in the middle, which is convenient for collecting magnetic and non-magnetic materials.

[0041] Example 2:

[0042] Reference Figure 6 and Figure 7The difference between Example 2 and Example 1 is that parallel first guide plates 61 are provided on both sides above the conveyor belt 6, and two parallel second guide plates 62 are provided in the middle position of the conveyor belt 6. The distance between the two second guide plates 62 matches the width of the second magnetic steel 26. The end of the second guide plate 62 is located above the end of the first magnetic steel 25 close to the output direction of the conveyor belt 6, and the end of the first guide plate 61 is located above the end of the first magnetic steel 25 close to the input direction of the conveyor belt 6. A third guide plate 63 is provided between the first guide plate 61 and the second guide plate 62 close to the input direction of the conveyor belt 6. A magnetic material channel is formed between the first guide plate 61 and the adjacent second guide plate 62, and a non-magnetic material channel is formed between the two second guide plates 62. After being poured onto the conveyor belt 6 through the feeder 3, the material passes through the first guide plate 61 and the third guide plate 63 and enters the first sorting area. Since the third guide plate 63 covers the entire first sorting area, the material is prevented from being located on both sides of the conveyor belt 6 at the beginning, and the material is concentrated in the middle position of the conveyor belt 6. All materials are sorted for the first time between the two third guide plates 63. The sorted materials enter the non-magnetic material channel between the two second guide plates 62, and then undergo secondary sorting when passing through the second sorting area. The magnetic material adhered to the first magnetic medium monomer 51 rotates to the non-first sorting area and the second sorting area, and is located above the two magnetic material channels, so that the magnetic material falls into the two magnetic material channels, avoiding the magnetic material and the non-magnetic material from mixing again after sorting, and facilitating the subsequent collection of the magnetic material and the non-magnetic material.

[0043] A flat material assembly 7 is provided on the two first guide plates 61. The flat material assembly 7 is located at the conveying end of the first magnetic steel 25 close to the conveyor belt 6. The flat material assembly 7 includes a flat material plate 71, a lifting screw 72 and a lifting guide rod 73. The lifting screw 72 is rotatably connected to one of the first guide plates 61. A working motor 74 for driving the lifting screw 72 to rotate is installed on the first guide plate 61. The output shaft of the working motor 74 is coaxially fixedly connected to the lifting screw 72. The lifting guide rod 73 is fixedly connected to the other first guide plate 61. Lifting blocks 711 are provided on both sides of the flat material plate 71. The lifting screw 72 is threadedly connected to a lifting block 711, and the lifting guide rod 73 is slidingly connected to another lifting block 711. By starting the working motor 74, the lifting screw 72 is rotated to adjust the height position of the flat plate 71, thereby adjusting the distance between the flat plate 71 and the conveyor belt 6. Since the material falls from the feed hopper 31, it is easy to accumulate on the conveyor belt 6, affecting the sorting effect. When the material is transported by the conveyor belt 6, the flat plate 71 will spread the accumulated material when passing through the flat plate 71, which is convenient for sorting the material and improves the sorting effect.

[0044] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A permanent magnetic dry separator, comprising a base (1), characterized in that: The machine base (1) is provided with a support (2), the machine base (1) is provided with a conveyor belt (6) located in the support (2), a driving motor (21) is provided above the support (2), the output shaft of the driving motor (21) is provided with a circular ring disk (4) located above the conveyor belt (6), a magnetic collecting disk (5) is fixedly connected below the circular ring disk (4), the magnetic collecting disk (5) is provided with a plurality of first magnetic collecting medium monomers (51) facing the conveyor belt (6) at equal intervals along the circumference, and the support (2) is provided with a first magnetic steel (25) and a second magnetic steel (26) in sequence along the conveying direction of the conveyor belt (6), the first magnetic steel (25) and the second magnetic steel (26) are both located in the middle of the conveyor belt (6), the width of the first magnetic steel (25) matches the width of the conveyor belt (6), and the width of the second magnetic steel (26) is smaller than the width of the conveyor belt (6).

2. A permanent magnetic dry separator according to claim 1, characterized in that: Parallel first guide plates (61) are provided on both sides above the conveyor belt (6), and two parallel second guide plates (62) are provided in the middle of the conveyor belt (6). The distance between the two second guide plates (62) matches the width of the second magnetic steel (26). The end of the second guide plate (62) is located above the end of the first magnetic steel (25) close to the conveyor belt (6) in the output direction. The end of the first guide plate (61) is located above the end of the first magnetic steel (25) close to the conveyor belt (6) in the input direction. A third guide plate (63) is provided between the first guide plate (61) and the second guide plate (62) close to the conveyor belt (6) in the input direction. A magnetic material channel is formed between the first guide plate (61) and the adjacent second guide plate (62), and a non-magnetic material channel is formed between the two second guide plates (62).

3. A permanent magnetic dry separator according to claim 2, characterized in that: The support (2) is provided with an auxiliary unloading component (9) located above the non-magnetic material channel, the auxiliary unloading component (9) comprising an air pump (91) and an air outlet nozzle (92), the air pump (91) being installed below the support (2), the air outlet nozzle (92) being connected to the air pump (91), and the air outlet nozzle (92) being directed toward the first magnetic concentrating medium monomer (51).

4. A permanent magnetic dry separator according to claim 2, characterized in that: A flat material assembly (7) is provided on the two first guide plates (61), and the flat material assembly (7) is located at the conveying end of the first magnetic steel (25) close to the conveying belt (6). The flat material assembly (7) includes a flat material plate (71), a lifting screw (72) and a lifting guide rod (73). The lifting screw (72) is rotatably connected to one of the first guide plates (61), and the lifting guide rod (73) is fixedly connected to the other first guide plate (61). Lifting blocks (711) are provided on both sides of the flat material plate (71), the lifting screw (72) is threadedly connected to one lifting block (711), and the lifting guide rod (73) is slidably connected to the other lifting block (711).

5. A permanent magnetic dry separator according to claim 1, characterized in that: The annular disk (4) is provided with an annular sleeve (8) located above the magnetic focusing disk (5); the annular sleeve (8) is provided with an electric cylinder (81); the output shaft of the electric cylinder (81) is provided with a connecting ring (82); a plurality of second magnetic focusing medium monomers (83) are circumferentially equidistantly arranged below the connecting ring (82); the magnetic focusing disk (5) is provided with a plurality of mounting sockets (52) located in the middle of the first magnetic focusing medium monomers (51); the plurality of mounting sockets (52) correspond one to one with the second magnetic focusing medium monomers (83).

6. A permanent magnetic dry separator according to claim 5, characterized in that: An annular positioning plate (53) is provided above the magnetic focusing disc (5), and a passage slot (531) is provided on the annular positioning plate (53) for the second magnetic focusing medium monomer (83) to pass through. An extrusion spring (831) is provided between the connecting ring (82) and the annular positioning plate (53) and is sleeved on the second magnetic focusing medium monomer (83).

7. A permanent magnetic dry separator according to claim 5, characterized in that: The magnetic collecting disc (5) is provided with a guide groove (54) connected to the installation socket (52), and the second magnetic collecting medium monomer (83) is provided with a guide block (832) located in the guide groove (54).

8. The permanent magnetic dry separator according to claim 1, characterized in that: A feeder (3) is provided above the support (2) and is located above the conveyor belt (6). The feeder (3) includes a feeding hopper (31), a feeding channel (32) and a feeding valve. The feeding channel (32) is connected to the bottom end of the feeding hopper (31), and the feeding valve is installed in the feeding channel (32).

9. The permanent magnetic dry separator according to claim 1, characterized in that: The machine base (1) is provided with three lower hoppers (11) located below one output end of the conveyor belt (6), and the three lower hoppers (11) correspond one to one with two magnetic material channels and one non-magnetic material channel.

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