Multi-roller magnetic separator

Abstract

A multi-roller magnetic separator relates to the technical field of magnetic separators and comprises a supporting box, a first magnetic separation assembly, a second magnetic separation assembly, a third magnetic separation assembly, a fourth magnetic separation assembly and a fifth magnetic separation assembly are arranged in the supporting box, and the first magnetic separation assembly, the second magnetic separation assembly, the third magnetic separation assembly and the fifth magnetic separation assembly are horizontally arranged side by side in the length direction of the supporting box. The distance between every two adjacent magnetic separation assemblies in the first magnetic separation assembly to the fourth magnetic separation assembly is gradually increased in the length direction of the supporting box, the distance between the first magnetic separation assembly and the second magnetic separation assembly is the smallest, and a feeding mechanism communicating with an inner cavity of the supporting box is arranged at the position, close to the first magnetic separation assembly, of the top of the supporting box. A waste discharging groove is formed in the bottom of the supporting box in a penetrating mode, and a discharging plate is fixedly arranged below the fourth magnetic separation assembly. The magnetic separator solves the problems that the screening process is tedious and the efficiency is low when an existing magnetic separator is used for screening high-purity magnetic ore grains; mineral aggregates are easy to damage the roller in the process of screening the magnetic mineral grains; and the mineral aggregate screening effect is poor.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic separators, in particular to a multi-roller magnetic separator. Background Art

[0002] Magnetic separator is a kind of equipment used to remove magnetic particles from powdery particles. Since the magnetic forces on magnetic particles and non-magnetic particles are different in the magnetic field, the magnetic particles are adsorbed on the surface of the drum under the action of the magnetic force in the magnetic field, and are unloaded when the drum rotates to the non-magnetic field area. The non-magnetic and weakly magnetic particles have different trajectories due to the different magnetic forces they are subjected to. Therefore, this principle is used to recycle the magnetic mineral particles in the ore (such as magnetite, pyrrhotite, roasted ore, ilmenite and other materials), and separate and screen the non-magnetic mineral materials (such as gangue, etc.), so as to improve the recovery efficiency of resources.

[0003] The existing magnetic separators gradually exposed their shortcomings during use, mainly in the following aspects:

[0004] First, the screening accuracy of the same magnetic separator for mineral materials is fixed. When screening high-purity magnetic mineral particles, it is necessary to use magnetic separators with multiple screening accuracy to repeatedly screen the mineral materials. The screening process is cumbersome and inefficient. In addition, multiple magnetic separators not only increase production costs, but also increase subsequent maintenance work.

[0005] Second, the ore particles in the ore material are of different sizes. When the larger magnetic ore particles enter the magnetic separator, they are adsorbed on the surface of the drum and rotate with the drum. When they rotate between the two drums, the magnetic ore particles are easily stuck between the two drums, thereby causing damage to the drum.

[0006] Third, the existing magnetic separators have poor screening effects and do not screen the magnetic mineral particles in the ore thoroughly. Specifically, when the drum is rotating, some magnetic mineral particles will fall off the drum and fall into the non-magnetic ore. In order to reduce the waste of magnetic ore, the staff needs to add the screened non-magnetic ore back into the magnetic separator for repeated screening.

[0007] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0008] In view of the defects in the prior art, the technical problem to be solved by the utility model is to provide a multi-roller magnetic separator, which can perform multi-stage screening on magnetic ore particles in the ore material, and then quickly screen out high-purity magnetic ore particles in the ore material, thereby improving the screening efficiency of magnetic ore particles;

[0009] The magnetic separator can also crush larger ore particles in the ore material to prevent the ore particles from damaging the equipment;

[0010] The magnetic separator can also automatically repeat screening of mineral materials after multi-stage screening, thereby improving the screening effect of the mineral materials.

[0011] In order to solve the above problems, the utility model provides the following technical solutions:

[0012] A multi-roller magnetic separator comprises a support box, wherein a first magnetic separation component, a second magnetic separation component, a third magnetic separation component, a fourth magnetic separation component and a fifth magnetic separation component are arranged inside the support box, wherein the first magnetic separation component to the fourth magnetic separation component are arranged horizontally in parallel along the length direction of the support box, and the distance between two adjacent magnetic separation components from the first magnetic separation component to the fourth magnetic separation component gradually increases along the length direction of the support box, and the distance between the first magnetic separation component and the second magnetic separation component is the smallest.

[0013] A loading mechanism connected to the inner cavity of the support box is provided at the top near the first magnetic separation component, a waste discharge trough is penetrated through the bottom of the support box, a discharge plate is fixedly provided below the fourth magnetic separation component, one end of the discharge plate is inclined toward the bottom of the support box and passes through the first magnetic separation component to the bottom of the third magnetic separation component in sequence and then extends to the top of the waste discharge trough, the fifth magnetic separation component is located between the discharge plate and the first magnetic separation component, the magnetic field strengths of the first magnetic separation component to the fourth magnetic separation component are the same, and the magnetic field strength of the fifth magnetic separation component is smaller than that of the first magnetic separation component.

[0014] A fine material discharge groove is penetrated on the inner wall of the support box near the fourth magnetic separation component, and an inclined discharge plate is fixedly provided inside the support box. One end of the discharge plate extends upward to a position close to the fourth magnetic separation component, and the other end of the discharge plate extends downward and passes through the fine material discharge groove to the outside.

[0015] As an optimized solution, the first magnetic separation assembly to the fifth magnetic separation assembly have the same structure. The first magnetic separation assembly includes a rotating tube with sealed ends at both ends. A fixed shaft is coaxially arranged inside the rotating tube. Both ends of the fixed shaft pass through the opposite ends of the rotating tube and are fixedly connected to the opposite inner walls of the supporting box. The rotating tube is rotatably connected to the fixed shaft.

[0016] A magnetic block coaxially arranged therewith is provided in the rotating tube, the longitudinal section of the magnetic block is a fan-shaped structure, the magnetic block is fixedly connected to the fixed shaft, and the magnetic field strength of the magnetic block located at the bottom is smaller than that of the other four magnetic blocks.

[0017] As an optimized solution, the feeding mechanism includes a fixed box with an opening at the bottom, the open end of the fixed box passes through the top of the supporting box and is connected to the inner cavity of the supporting box, a feed channel and two crushing assemblies are provided in the fixed box, the two crushing assemblies are horizontally arranged in parallel, the feed channel is located above the crushing assembly, and the feed port of the feed channel extends through the inner top of the fixed box to the outside, and the two discharge ports of the feed channel are respectively located above the two crushing assemblies.

[0018] As an optimized solution, the crushing assembly includes a driving crushing roller and a driven crushing roller which are arranged to rotate along a horizontal line. The driving crushing roller is meshed with the driven crushing roller, and the relative ends of the driving crushing roller and the driven crushing roller are rotationally connected to the relative inner walls of the fixed box.

[0019] As an optimized solution, a sieve plate fixedly connected to the inner wall of the fixed box is provided inside, the sieve plate is located below the driving crushing roller, and two vibrators are provided at the bottom of the sieve plate.

[0020] As an optimized solution, a material guide plate is fixed on one of the inner walls of the support box, the material guide plate is located below the fixed box, one end of the material guide plate is inclined toward the bottom of the support box and extends to a position close to the rotating tube, and a flow limiting plate is provided above the material guide plate.

[0021] As an optimized solution, a rotating shaft rotatably arranged along a horizontal line is provided above the material guide plate, and a plurality of material shifting plates are evenly distributed on the peripheral wall of the rotating shaft along its circumference.

[0022] As an optimized solution, a plurality of material blocking plates are evenly distributed on the peripheral wall of the rotating tube along its circumference.

[0023] As an optimized solution, one end of the rotating tube is fixedly connected to a fixed tube coaxially arranged therewith, the inner diameter of the fixed tube is larger than the diameter of the fixed shaft, and a lower driven gear is fixedly sleeved on the outer wall of the fixed tube.

[0024] As an optimized solution, five lower driving gears rotatably arranged along a horizontal line are provided on one of the inner walls of the support box, and the five lower driving gears are correspondingly meshed with five lower driven gears.

[0025] Compared with the prior art, the beneficial effects of the utility model are:

[0026] 1. The magnetic ore particles in the ore material will be screened step by step during the process of moving from the first magnetic separation component to the fourth magnetic separation component. The high-purity magnetic ore material is discharged to the outside of the support box through the discharge plate, and the low-purity magnetic ore particles fall to the discharge plate, realizing the function of multi-stage screening of the magnetic ore particles in the ore material, and then quickly screening out the high-purity magnetic ore particles in the ore material, thereby improving the screening efficiency of the magnetic ore particles;

[0027] 2. The feeding mechanism can crush the ore and evenly transport the qualified ore to the first magnetic separation component for preliminary screening, effectively preventing large ore particles from damaging the equipment;

[0028] 3. The fifth magnetic separation component can adsorb the magnetic ore particles in the ore on the discharge plate again and transfer them to the first magnetic separation component for repeated screening, thereby realizing the function of repeated screening of ore after multi-stage screening and improving the screening effect of ore. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0030] Figure 1 It is a schematic diagram of the structure of the utility model;

[0031] Figure 2 It is a schematic diagram of the structure of the waste discharge chute of the utility model;

[0032] Figure 3 It is a structural schematic diagram of a fixed pipe of the utility model;

[0033] Figure 4 This is a schematic diagram of the structure of the crushing assembly of the utility model;

[0034] Figure 5 It is a structural schematic diagram of the control motor of the utility model.

[0035] In the figure: 1-support box; 2-guide plate; 3-rotating shaft; 4-feeding mechanism; 5-feeding plate; 6-current limiting plate; 7-first magnetic separation component; 8-second magnetic separation component; 9-third magnetic separation component; 10-material baffle plate; 11-rotating tube; 12-magnetic block; 13-fixed shaft; 14-fourth magnetic separation component; 15-discharging plate; 16-discharging plate; 17-fifth magnetic separation component; 18-lower driving gear; 19-lower driven gear; 20-fixed tube; 21-waste discharge chute; 22-upper driving motor; 23-upper driving gear; 24-upper driven gear; 25-feeding channel; 26-fine material discharge chute; 27-fixed box; 28-crushing component; 29-driven crushing roller; 30-screen plate; 31-vibrator; 32-driving crushing roller; 33-lower driving motor; 34-control motor. DETAILED DESCRIPTION

[0036] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0037] like Figures 1 to 5 As shown, a multi-roller magnetic separator includes a support box 1, wherein a first magnetic separation component 7, a second magnetic separation component 8, a third magnetic separation component 9, a fourth magnetic separation component 14 and a fifth magnetic separation component 17 are arranged inside the support box 1, wherein the first magnetic separation component 7 to the fourth magnetic separation component 14 are horizontally arranged in parallel along the length direction of the support box 1, and the distance between two adjacent magnetic separation components in the first magnetic separation component 7 to the fourth magnetic separation component 14 gradually increases along the length direction of the support box 1, and the distance between the first magnetic separation component 7 and the second magnetic separation component 8 is the smallest.

[0038] A loading mechanism 4 connected to the inner cavity of the support box 1 is provided at the top near the first magnetic separation component 7. A waste discharge groove 21 is penetrated through the bottom of the support box 1. A discharge plate 16 is fixedly provided below the fourth magnetic separation component 14. One end of the discharge plate 16 is inclined toward the bottom of the support box 1 and passes through the bottom of the first magnetic separation component 7 to the third magnetic separation component 9 in sequence and then extends to the top of the waste discharge groove 21. The fifth magnetic separation component 17 is located between the discharge plate 16 and the first magnetic separation component 7. The magnetic field strengths of the first magnetic separation component 7 to the fourth magnetic separation component 14 are the same, and the magnetic field strength of the fifth magnetic separation component 17 is less than that of the first magnetic separation component 7.

[0039] A fine material discharge slot 26 is provided through the inner wall of the support box 1 near the fourth magnetic separation component 14, and an inclined discharge plate 15 is fixed inside the support box 1. One end of the discharge plate 15 extends upward to a position close to the fourth magnetic separation component 14, and the other end of the discharge plate 15 extends downward and passes through the fine material discharge slot 26 to the outside.

[0040] The ore can be crushed by the feeding mechanism 4, and the ore of qualified volume can be transported to the first magnetic separation component 7 for preliminary screening; the magnetic ore particles in the ore will be screened step by step during the movement from the first magnetic separation component 7 to the fourth magnetic separation component 14, and the magnetic ore particles with low purity will fall to the discharge plate 16; the fifth magnetic separation component 17 can adsorb the magnetic ore particles in the ore on the discharge plate 16 again, and transfer them to the first magnetic separation component 7 for repeated screening.

[0041] The first magnetic separation assembly 7 to the fifth magnetic separation assembly 17 have the same structure. The first magnetic separation assembly 7 includes a rotating tube 11 with sealed ends at both ends. A fixed shaft 13 is coaxially arranged in the rotating tube 11. Both ends of the fixed shaft 13 pass through the opposite ends of the rotating tube 11 and are fixedly connected to the opposite inner walls of the supporting box 1. The rotating tube 11 is rotatably connected to the fixed shaft 13.

[0042] A magnetic block 12 is coaxially arranged in the rotating tube 11. The longitudinal section of the magnetic block 12 is a fan-shaped structure. The magnetic block 12 is fixedly connected to the fixed shaft 13. The magnetic field strength of the lower magnetic block 12 is smaller than that of the other four magnetic blocks 12.

[0043] When the rotating tube 11 rotates to an area containing the magnetic block 12, the magnetic mineral particles are adsorbed on the outer wall of the rotating tube 11 and rotate together with the rotating tube 11; when the rotating tube 11 rotates to an area not containing the magnetic block 12, the magnetic mineral particles are separated from the rotating tube 11, among which the magnetic mineral particles with higher precision are adsorbed by the next rotating tube 11, and the magnetic mineral particles with lower precision fall to the discharge plate 16.

[0044] The feeding mechanism 4 includes a fixed box 27 with an opening at the bottom, the open end of the fixed box 27 passes through the top of the support box 1 and is connected to the inner cavity of the support box 1, a feed channel 25 and two crushing assemblies 28 are arranged in the fixed box 27, the two crushing assemblies 28 are arranged horizontally in parallel, the feed channel 25 is located above the crushing assemblies 28, and the feed port of the feed channel 25 passes through the inner top of the fixed box 27 and extends to the outside, and the two discharge ports of the feed channel 25 are respectively located above the two crushing assemblies 28;

[0045] The crushing assembly 28 can be used to crush larger mineral materials, and the two crushing assemblies 28 can increase the crushing speed of the mineral materials.

[0046] The crushing assembly 28 includes a driving crushing roller 32 and a driven crushing roller 29 which are arranged to rotate along a horizontal line. The driving crushing roller 32 is meshed with the driven crushing roller 29, and the opposite ends of the driving crushing roller 32 and the driven crushing roller 29 are correspondingly connected to the relative inner walls of the fixed box 27 for rotation.

[0047] The fixed box 27 has a sieve plate 30 fixedly connected to its inner wall. The sieve plate 30 is located below the driving crushing roller 32. Two vibrators 31 are provided at the bottom of the sieve plate 30.

[0048] The screen plate 30 can screen the crushed mineral materials, and the mineral materials with qualified volume enter the support box 1 through the screen plate 30 for screening, further improving the protection effect of the rotating tube 11.

[0049] A material guide plate 2 is fixedly provided on one of the inner walls of the support box 1. The material guide plate 2 is located below the fixed box 27. One end of the material guide plate 2 is inclined toward the bottom of the support box 1 and extends to a position close to the rotating tube 11. A flow limiting plate 6 is provided above the material guide plate 2.

[0050] The flow limiting plate 6 can control the amount of mineral material discharged to the rotating tube 11 to prevent insufficient screening of the mineral material due to excessive mineral material.

[0051] A rotating shaft 3 is arranged above the guide plate 2 and is arranged to rotate along a horizontal line. A plurality of material-dispensing plates 5 are evenly distributed on the peripheral wall of the rotating shaft 3 along its circumference.

[0052] During the rotation of the material-shifting plate 5 , the mineral material can be orderly controlled to flow to the rotating tube 11 through the flow-limiting plate 6 , thereby effectively preventing the mineral material from being blocked.

[0053] A plurality of baffle plates 10 are evenly distributed on the peripheral wall of the rotating tube 11 along its circumference;

[0054] The baffle plate 10 can facilitate the separation of the magnetic mineral particles from the rotating tube 11 when the rotating tube 11 rotates to an area without the magnetic block 12 .

[0055] One end of the rotating tube 11 is fixedly connected to a fixed tube 20 coaxially arranged therewith. The inner diameter of the fixed tube 20 is larger than the diameter of the fixed shaft 13. A lower driven gear 19 is fixedly sleeved on the outer wall of the fixed tube 20.

[0056] Five lower driving gears 18 rotatably arranged along a horizontal line are provided on one of the inner walls of the supporting box 1 , and the five lower driving gears 18 are meshed with five lower driven gears 19 correspondingly.

[0057] Five control motors 34 are fixedly mounted on the outer wall of the support box 1 , and output ends of the five control motors 34 pass through the support box 1 and are fixedly connected to the five lower drive gears 18 correspondingly.

[0058] Two upper driving gears 23 and two upper driven gears 24 are provided on the outer wall of the fixed box 27 so as to rotate along a horizontal line. The two driving crushing rollers 32 and the two driven crushing rollers 29 are connected to the two upper driving gears 23 and the two upper driven gears 24 respectively. The two upper driving gears 23 are meshed with the two upper driven gears 24 respectively.

[0059] Two upper drive motors 22 are fixedly disposed on the outer wall of the fixed box 27 , and the output ends of the two upper drive motors 22 are fixedly connected to the two upper drive gears 23 , respectively.

[0060] Both ends of the rotating shaft 3 are rotatably connected to the relative inner walls of the supporting box 1 . A lower driving motor 33 is fixedly provided on the outer wall of the supporting box 1 . The output end of the lower driving motor 33 passes through the supporting box 1 and is fixedly connected to the rotating shaft 3 .

[0061] The working principle of this device is:

[0062] When adding mineral materials into the support box 1, the mineral materials are added into the support box 1 through the feeding port of the feeding channel 25. The mineral materials move downward and fall between the driving crushing roller 32 and the driven crushing roller 29 through the two discharge ports of the feeding channel 25. The two upper driving motors 22 drive the two upper driving gears 23 to rotate, and then drive the two upper driven gears 24 to rotate, thereby driving the two driving crushing rollers 32 and the two driven crushing rollers 29 to rotate. The mineral materials are crushed during the rotation of the driving crushing rollers 32 and the driven crushing rollers 29. The crushed mineral materials fall above the screen plate 30, and the two vibrators 31 generate vibrations. Then, the ore on the screen plate 30 is vibrated, and the ore with a qualified volume passes through the screen plate 30 and falls to the guide plate 2, and then slides downward along the guide plate 2. The flow limiting plate 6 can control the amount of ore flowing to the first rotating tube 11 to prevent insufficient screening of the ore due to excessive ore. At the same time, the lower driving motor 33 drives the rotating shaft 3 to rotate, and then drives the material-dispensing plate 5 to rotate, effectively preventing the ore from being blocked, realizing the function of quickly crushing the ore and screening the crushed ore, strengthening the protection of the rotating tube 11, and realizing the function of uniformly feeding the ore to the first rotating tube 11;

[0063] When screening the mineral materials, the five control motors 34 respectively drive the five lower driving gears 18 to rotate, and then drive the five lower driven gears 19 and the five fixed tubes 20 to rotate, thereby driving the five rotating tubes 11 to rotate. During the process of the mineral materials on the guide plate 2 falling downward, the magnetic particles therein are adsorbed on the first rotating tube 11, and the non-magnetic mineral materials fall downward and contact with the rotating tube 11 located below and then fall to the discharge plate 16, and then are discharged to the outside of the support box 1 through the waste discharge chute 21. During the rotation of the first rotating tube 11, the magnetic mineral particles are driven to rotate synchronously until the rotating tube 11 rotates to an area without magnetic blocks 12, and the magnetic particles are separated from the first rotating tube 11 and move downward, wherein the magnetic mineral particles with higher purity are adsorbed by the second rotating tube 11, and the magnetic mineral particles with lower purity fall to the discharge plate 16. Similarly, the second rotating tube 11 rotates to an area without magnetic blocks 12. , the magnetic mineral particles are separated from the second rotating tube 11 and move downward, wherein the magnetic mineral particles with higher purity are adsorbed by the third rotating tube 11, and the magnetic mineral particles with lower purity fall to the discharge plate 16. Since the distance between the first rotating tube 11 and the second rotating tube 11 is smaller than the distance between the second rotating tube 11 and the third rotating tube 11, the purity of the magnetic mineral particles adsorbed on the third rotating tube 11 is higher, and so on, the purity of the magnetic mineral particles adsorbed on the fourth rotating tube 11 is the highest. When the fourth rotating tube 11 rotates to an area without magnetic blocks 12, the magnetic mineral particles are separated from the fourth rotating tube 11 and fall to the discharge plate 15, and then slide to the outside of the support box 1 through the discharge plate 15 for collection, thereby realizing the function of multi-stage screening of the magnetic mineral particles in the ore, and then quickly screening out the high-purity magnetic mineral particles in the ore, thereby improving the screening efficiency of the magnetic mineral particles;

[0064] The magnetic mineral particles dropped from the first rotating tube 11 to the fourth rotating tube 11 to the discharge plate 16 move downward along the guide plate 2. When approaching the rotating tube 11 below, the magnetic block 12 below absorbs the magnetic mineral particles, and then the magnetic mineral particles are adsorbed onto the rotating tube 11 below again and rotate together with the rotating tube 11. When the magnetic mineral particles on the rotating tube 11 below are close to the first rotating tube 11, they are adsorbed onto the first rotating tube 11, and then the above screening process is repeated again, realizing the function of repeatedly screening the mineral materials after multi-stage screening, and improving the screening effect of the mineral materials;

[0065] After the ore screening is completed, the container for collecting non-magnetic ore is moved away from the bottom of the support box 1, and a receiving container for collecting low-purity magnetic ore particles is placed. The control motor 34 located below rotates in the opposite direction. At this time, the five rotating tubes 11 rotate in the same direction. The magnetic ore particles on the discharge plate 16 are adsorbed onto the rotating tube 11 below during the downward movement. When the rotating tube 11 below rotates to an area without magnetic blocks 12, the magnetic ore particles are separated from the rotating tube 11, and the magnetic ore particles enter the receiving container through the waste discharge trough 21.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A multi-roller magnetic separator, characterized in that: The invention comprises a support box (1), wherein a first magnetic separation component (7), a second magnetic separation component (8), a third magnetic separation component (9), a fourth magnetic separation component (14) and a fifth magnetic separation component (17) are arranged inside the support box (1), wherein the first magnetic separation component (7) to the fourth magnetic separation component (14) are arranged horizontally in parallel along the length direction of the support box (1), and the distance between two adjacent magnetic separation components in the first magnetic separation component (7) to the fourth magnetic separation component (14) gradually increases along the length direction of the support box (1), and the distance between the first magnetic separation component (7) and the second magnetic separation component (8) is the smallest. A loading mechanism (4) connected to the inner cavity of the support box (1) is provided at the top of the support box (1) near the first magnetic separation component (7); a waste discharge trough (21) is provided through the bottom of the support box (1); a discharge plate (16) is fixedly provided below the fourth magnetic separation component (14); one end of the discharge plate (16) is inclined toward the bottom of the support box (1) and passes through the bottom of the first magnetic separation component (7) to the third magnetic separation component (9) in sequence and then extends to the top of the waste discharge trough (21); the fifth magnetic separation component (17) is located between the discharge plate (16) and the first magnetic separation component (7); the magnetic field strengths of the first magnetic separation component (7) to the fourth magnetic separation component (14) are the same; the magnetic field strength of the fifth magnetic separation component (17) is smaller than that of the first magnetic separation component (7); A fine material discharge groove (26) is provided through the inner wall of the support box (1) near the fourth magnetic separation component (14), and an inclined discharge plate (15) is fixedly provided inside the support box (1), one end of the discharge plate (15) extends upward to a position close to the fourth magnetic separation component (14), and the other end of the discharge plate (15) extends downward and passes through the fine material discharge groove (26) to the outside.

2. A multi-roller magnetic separator according to claim 1, characterized in that: The first magnetic separation assembly (7) to the fifth magnetic separation assembly (17) have the same structure. The first magnetic separation assembly (7) comprises a rotating tube (11) with sealed ends at both ends. A fixed shaft (13) is coaxially arranged inside the rotating tube (11). The two ends of the fixed shaft (13) respectively pass through the opposite ends of the rotating tube (11) and are fixedly connected to the opposite inner walls of the supporting box (1). The rotating tube (11) is rotatably connected to the fixed shaft (13). A magnetic block (12) coaxially arranged therewith is arranged in the rotating tube (11), the longitudinal section of the magnetic block (12) is a fan-shaped structure, the magnetic block (12) is fixedly connected to the fixed shaft (13), and the magnetic field strength of the magnetic block (12) located at the bottom is smaller than the magnetic field strengths of the other four magnetic blocks (12).

3. A multi-roller magnetic separator according to claim 2, characterized in that: The feeding mechanism (4) comprises a fixed box (27) with an opening at the bottom, the open end of the fixed box (27) passes through the top of the supporting box (1) and is connected to the inner cavity of the supporting box (1), a feeding channel (25) and two crushing assemblies (28) are arranged in the fixed box (27), the two crushing assemblies (28) are arranged horizontally in parallel, the feeding channel (25) is located above the crushing assemblies (28), and the feeding port of the feeding channel (25) passes through the inner top of the fixed box (27) and extends to the outside, and the two discharge ports of the feeding channel (25) are respectively located above the two crushing assemblies (28).

4. A multi-roller magnetic separator according to claim 3, characterized in that: The pulverizing assembly (28) comprises a driving pulverizing roller (32) and a driven pulverizing roller (29) which are arranged to rotate along a horizontal line. The driving pulverizing roller (32) is meshed with the driven pulverizing roller (29), and the opposite ends of the driving pulverizing roller (32) and the driven pulverizing roller (29) are rotatably connected to the opposite inner wall of the fixed box (27) correspondingly.

5. A multi-roller magnetic separator according to claim 4, characterized in that: A sieve plate (30) fixedly connected to the inner wall of the fixed box (27) is provided inside the fixed box (27). The sieve plate (30) is located below the driving crushing roller (32). Two vibrators (31) are provided at the bottom of the sieve plate (30).

6. A multi-roller magnetic separator according to claim 5, characterized in that: A material guide plate (2) is fixedly provided on one of the inner walls of the support box (1), the material guide plate (2) is located below the fixed box (27), one end of the material guide plate (2) is inclined toward the bottom of the support box (1) and extends to a position close to the rotating tube (11), and a flow limiting plate (6) is provided above the material guide plate (2).

7. A multi-roller magnetic separator according to claim 6, characterized in that: A rotating shaft (3) is arranged above the material guide plate (2) and is arranged to rotate along a horizontal line. A plurality of material shifting plates (5) are evenly distributed on the peripheral wall of the rotating shaft (3) along its circumference.

8. A multi-roller magnetic separator according to claim 7, characterized in that: A plurality of material blocking plates (10) are evenly distributed on the peripheral wall of the rotating tube (11) along its circumference.

9. A multi-roller magnetic separator according to claim 8, characterized in that: One end of the rotating tube (11) is fixedly connected to a fixed tube (20) coaxially arranged therewith, the inner diameter of the fixed tube (20) is larger than the diameter of the fixed shaft (13), and a lower driven gear (19) is fixedly sleeved on the outer wall of the fixed tube (20).

10. A multi-roll magnetic separator according to claim 9, characterized in that: Five lower driving gears (18) are arranged on one of the inner walls of the support box (1) to rotate along a horizontal line, and the five lower driving gears (18) are meshed with five lower driven gears (19) respectively.

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