Excitation device for preventing magnetic voids of oversize electromagnetic elutriation classificator

Abstract

The invention discloses an excitation device for preventing magnetic voids of an oversize electromagnetic elutriation classificator, which belongs to the technical field of mineral concentration equipment and comprises a separation cylinder, an overflow component is arranged at the top of the separation cylinder, and a feeding component is stacked on the overflow component; a concentrate discharging opening is formed in the bottom of the water tank, and a water feeding opening is formed in the side; a fixed coil group, a circulating coil group and a compensating coil group which are composed of a plurality of magnet exciting coils are sequentially sleeved outside the coil body from top to bottom, and the adjacent magnet exciting coils are arranged at intervals; a plurality of magnetism gathering magnet yokes made of magnetic conductive materials correspond to the magnet exciting coils one to one, containing grooves are formed in the magnetism gathering magnet yokes, and the magnet exciting coils are embedded in the containing grooves; the control system is connected with all the excitation coils; the magnetism gathering magnet yoke has a magnetic shielding effect on the magnet exciting coil armoring and can have a magnetism gathering effect on the magnetic field generated by the magnet exciting coil, magnetic leakage is prevented, the magnetic field intensity and depth in the separation barrel are improved, the magnetic attenuation phenomenon is reduced, magnetic cavities are prevented, and it is guaranteed that minerals are fully separated.

Description

Technical Field

[0001] The invention relates to the technical field of mineral concentrating equipment, and in particular to an excitation device for preventing magnetic voids in an extra-large electromagnetic elutriation and concentrating machine. Background Art

[0002] In recent years, with the continuous development of the global mining market and technological progress, the scale construction trend of mineral processing plants has shown the characteristics of large-scale, high efficiency, intelligence and environmental protection. Among them, the large-scale trend of mineral processing equipment in mineral processing plants has become increasingly obvious. Large-scale mineral processing equipment has high processing capacity, good selective separation ability and production efficiency, which can significantly reduce the processing cost of unit ore and improve production efficiency. It also reflects the mining companies' pursuit of economies of scale. If the large-scale mineral processing equipment is to be realized, it requires continuous technological progress and continuous improvement of equipment manufacturing capabilities, and continuous scientific and technological innovation. Developing more scientific, reasonable and advanced equipment and improving the mineral processing performance of mineral processing equipment has become the top priority of iron ore beneficiation.

[0003] At present, the washing machine, which plays a role in improving the quality of iron ore and reducing impurities to obtain iron concentrate, is also facing the trend of large-scale equipment. The washing machine is used at the end of the iron ore dressing process. It is an electromagnetic weak magnetic field magnetic gravity separation equipment. Its magnetic system is composed of several annular excitation coils. The excitation coils are arranged at a certain distance outside the separation drum. By energizing the excitation coils, the separation drum can have a magnetic field distribution. Under the action of the magnetic field and with the help of water flow, the ore particles can effectively remove the monomer gangue and intergrowths mixed in the magnetic ore, thereby realizing the separation of iron ore; to realize the large-scale washing machine and improve the equipment processing capacity and production efficiency, the diameter of the separation drum must be increased. With the increase of the diameter of the separation drum, the magnetic field distribution inside the separation drum will change accordingly, such as Figure 6 As shown, there will be excessive magnetic attenuation around the axis of the sorting drum, and even magnetic "voids" will appear; this phenomenon will make the magnetic field strength around the axis of the sorting drum fail to meet the mineral processing requirements, seriously affecting the sorting of minerals, resulting in incomplete mineral sorting and greatly reducing the processing capacity.

[0004] Therefore, it is an urgent problem to be solved at this stage to develop and design an excitation device that can effectively solve the magnetic attenuation phenomenon that occurs when the diameter of the sorting drum increases, avoid the occurrence of magnetic voids, ensure that the minerals entering the sorting drum can be fully sorted, and realize the large-scale washing machine. Summary of the invention

[0005] Regarding the problems existing in the prior art, the present invention provides an exciting device for preventing magnetic cavities in an extra-large electromagnetic elutriation separator. The exciting coils are all embedded in the receiving grooves of the magnetic concentrating yokes. While the magnetic concentrating yokes made of magnetic conductive materials play a role in magnetic shielding for the exciting coils, they can also play a role in concentrating the magnetic field generated by the exciting coils, effectively preventing magnetic leakage, enhancing the magnetic field strength and magnetic field depth in the separation cylinder, reducing the magnetic attenuation phenomenon around the axis of the separation cylinder, preventing the occurrence of magnetic cavities, ensuring the full separation of minerals entering the separation cylinder, and making it possible to enlarge the elutriator.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] The present invention provides an exciting device for preventing magnetic cavities in an extra-large electromagnetic elutriation separator, including:

[0008] A vertically arranged separation cylinder, an overflow assembly is provided at the top of the separation cylinder, a feeding assembly is stacked on the overflow assembly, and the lower end of the feeding assembly extends into the separation cylinder; a concentrate discharge port is provided at the bottom of the separation cylinder, and a water inlet is provided at the side of the separation cylinder; a fixed coil group, a circulating coil group, and a compensation coil group are sequentially sleeved outside the separation cylinder from top to bottom, and the fixed coil group, the circulating coil group, and the compensation coil group all include a plurality of exciting coils, and adjacent exciting coils are arranged at intervals;

[0009] A plurality of magnetic concentrating yokes, the magnetic concentrating yokes correspond to the exciting coils one by one, the magnetic concentrating yokes are sleeved outside the separation cylinder, the magnetic concentrating yokes have receiving grooves, the openings of the receiving grooves face the separation cylinder, and the exciting coils are embedded in the receiving grooves; the magnetic concentrating yokes are made of magnetic conductive materials;

[0010] A control system, the control system is connected to all the exciting coils, and the control system can separately control the exciting coils belonging to the fixed coil group and the exciting coils belonging to the circulating coil group to be alternately energized.

[0011] As a preferred technical solution, magnetic conductive screening meshes are provided at positions corresponding to the exciting coils in the separation cylinder.

[0012] As a preferred technical solution, the magnetic conductive screening mesh includes a magnetic conductive outer ring fixedly connected to the separation cylinder, a plurality of nested magnetic conductive inner rings are arranged inside the magnetic conductive outer ring, and a plurality of radial magnetic conductive plates are connected between the magnetic conductive outer ring and the outermost magnetic conductive inner ring and between adjacent magnetic conductive inner rings, and a plurality of axially distributed axial magnetic conductive plates are provided on the magnetic conductive inner rings;

[0013] And / or, the magnetic conductive screening meshes at positions corresponding to each exciting coil in the separation cylinder are all provided in two layers.

[0014] As a preferred technical solution, the magnetic flux concentrating yoke includes an outer yoke plate, an upper yoke plate and a lower yoke plate, and the outer yoke plate, the upper yoke plate and the lower yoke plate are spliced to form the accommodation groove.

[0015] As a preferred technical solution, the magnetic flux concentrating yoke further includes magnetic shoes, the magnetic shoes are fixed on the upper yoke plate and / or the lower yoke plate, and the thickness of the magnetic shoes gradually decreases along the radially outward direction of the sorting cylinder.

[0016] As a preferred technical solution, the thicknesses of the outer yoke plate, the upper yoke plate and the lower yoke plate are all set to be 10-50 mm;

[0017] And / or, the material of the magnetic flux concentrating yoke is set to silicon steel or electrolytic iron.

[0018] As a preferred technical solution, the exciting coil is wound by alloy electromagnetic wire;

[0019] And / or, the fixed coil group includes two of the exciting coils, and the magnetic field intensity range of the fixed coil group is set to be 100 Gs-250 Gs;

[0020] And / or, the circulating coil group includes five of the exciting coils, and the magnetic field intensity range of the circulating coil group is set to be 30 Gs-120 Gs;

[0021] And / or, the compensation coil group includes one of the exciting coils, the compensation coil group can form a uniform downward magnetic field, and the magnetic field intensity range of the compensation coil group is set to be 60 Gs-200 Gs;

[0022] And / or, the circulating coil group is located above the water inlet, and the compensation coil group is located below the water inlet.

[0023] As a preferred technical solution, the inner diameter of the sorting cylinder is not less than 2.2 m.

[0024] As a preferred technical solution, it further includes a frame, and the sorting cylinder is fixed on the frame.

[0025] As a preferred technical solution, a positioning component is provided between adjacent magnetic flux concentrating yokes;

[0026] And / or, the magnetic flux concentrating yoke is fixedly connected to the sorting cylinder;

[0027] And / or, an outer cylinder is sleeved outside the sorting cylinder, the outer cylinder is fixed on the frame, and the exciting coil and the magnetic flux concentrating yoke are both located between the outer cylinder and the sorting cylinder.

[0028] The beneficial effects of the present invention are as follows:

[0029] 1. The exciting coils of the present invention are all embedded in the accommodating grooves of the magnetic concentrating yoke. While the magnetic concentrating yoke made of magnetic conductive material plays a role in magnetic shielding for the exciting coils, it can also play a role in concentrating the magnetic field generated by the exciting coils, effectively preventing magnetic leakage, and enhancing the magnetic field strength and magnetic field depth in the sorting cylinder of the elutriator, reducing the magnetic attenuation phenomenon around the axis of the sorting cylinder, preventing the occurrence of magnetic "holes", ensuring the full sorting of minerals entering the sorting cylinder. The magnetic iron grade of the tailings is 1.26%-3.78% lower than that of the traditional elutriator, the total iron grade of the tailings is 1%-2.3% lower than that of the traditional elutriator, the total iron recovery rate of the iron concentrate is 0.25%-0.38% higher than that of the traditional elutriator, and the recovery rate of magnetic iron is 0.36%-0.43% higher than that of the traditional elutriator, making it possible to make the elutriator larger and improving the throughput and production efficiency.

[0030] 2. The magnetic field generated by the exciting coils of the present invention can be conducted and dispersed along the magnetic conductive sieve mesh in the sorting cylinder, which can increase the magnetic field width (amplitude) at each position of the sorting cylinder corresponding to each exciting coil, and also helps to further improve the uniformity of the magnetic field in the sorting cylinder.

[0031] 3. By adding magnetic shoes to the magnetic concentrating yoke, the present invention can increase the pole area of the magnetic concentrating yoke. While the magnetic concentrating yoke realizes magnetic concentration, it can also broaden the radiation area of the magnetic field in the axial direction of the sorting cylinder, that is, increase the magnetic field width (amplitude) in the sorting cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic diagram of the overall structure of the first embodiment of an exciting device for preventing magnetic holes in an extra-large electromagnetic elutriator and concentrator of the present invention;

[0033] Figure 2 is Figure 1 an enlarged view of area A in;

[0034] Figure 3 is Figure 1 a schematic diagram of the structure of the exciting coil and the magnetic concentrating yoke in;

[0035] Figure 4 is Figure 1 a schematic diagram of the structure of the magnetic conductive sieve mesh in;

[0036] Figure 5 is Figure 4 a top view of;

[0037] Figure 6 is a magnetic field distribution cloud map of the exciting coil without magnetic concentrating yoke armor;

[0038] Figure 7The magnetic field distribution nephogram of the excitation coil armored with a magnetic concentrating yoke with a thickness of 10 mm;

[0039] Figure 8 The magnetic field distribution nephogram of the excitation coil armored with a magnetic concentrating yoke with a thickness of 50 mm;

[0040] Figure 9 The structural schematic diagram of the excitation coil and the magnetic concentrating yoke in the second embodiment of an excitation device for preventing magnetic cavities in an extra-large electromagnetic elutriation separator according to the present invention.

[0041] In the figure: 1 - sorting cylinder, 11 - concentrate discharge port, 12 - water inlet, 2 - excitation coil, 21 - fixed coil group, 22 - circulating coil group, 23 - compensation coil group, 3 - magnetic concentrating yoke, 31 - receiving groove, 32 - outer magnetic yoke plate, 33 - upper magnetic yoke plate, 34 - lower magnetic yoke plate, 35 - magnetic shoe, 36 - positioning component, 4 - magnetic conducting sieve mesh, 41 - magnetic conducting outer ring, 42 - magnetic conducting inner ring, 43 - radial magnetic conducting plate, 44 - axial magnetic conducting plate, 5 - frame, 6 - overflow component, 7 - feeding component, 8 - outer cylinder. Specific embodiments

[0042] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0043] Embodiment 1

[0044] Please refer to Figures 1 - 8 , which is an embodiment of an excitation device for preventing magnetic cavities in an extra-large electromagnetic elutriation separator provided by the present invention. It includes a vertically arranged sorting cylinder 1. An overflow component 6 is provided at the top of the sorting cylinder 1. A feeding component 7 is stacked on the overflow component 6. The lower end of the feeding component 7 extends into the sorting cylinder 1. Minerals are scattered into the sorting cylinder 1 in a high-pressure state through the feeding component 7. A concentrate discharge port 11 is provided at the bottom of the sorting cylinder 1. A water inlet 12 is provided on the side of the sorting cylinder 1. Flushing water enters the sorting cylinder 1 through the water inlet 12 and flows upward in the sorting cylinder 1. The separated magnetic materials can be discharged from the bottom of the sorting cylinder 1, and the tailings are discharged from the sorting cylinder 1 through the overflow component 6. Specifically, the overflow component 6 is preferably set as an overflow device, and the feeding component 7 is preferably set as a feeding cylinder;

[0045] Outside the sorting cylinder 1, a fixed coil group 21, a circulating coil group 22, and a compensation coil group 23 are successively sleeved from top to bottom. The fixed coil group 21 includes two exciting coils 2. The two exciting coils 2 are stacked vertically and are alternately energized during operation. The strong magnetic field generated by the fixed coil group 21 can attract magnetic substances in the overflow pulp, reduce the overflow ratio of magnetic materials and rich-poor intergrowth bodies, prevent ore running, and control the tailing grade. The circulating coil group 22 includes five exciting coils 2. The five exciting coils 2 are alternately energized in a certain order to form an intermittent strong magnetic field area and weak magnetic field area in the sorting cylinder 1. The intermittent strong magnetic field and weak magnetic field respectively have the effects of adsorbing and discarding minerals, and "washing" the minerals repeatedly. Under the combined action of the flowing flushing water, the magnetic materials are continuously agglomerated and dispersed in the water, gradually removing the non-magnetic impurities wrapped in the minerals to form magnetic agglomerates. During the sinking process of the magnetic agglomerates, the non-magnetic impurities wrapped inside them become fewer and fewer, and finally the concentrate flows out downward from the concentrate discharge port 11. The non-magnetic impurities rise and overflow under the action of the rising flushing water flow, thereby realizing the washing of minerals and completing the ore dressing function. The compensation coil group 23 includes one exciting coil 2. The compensation coil group 23 can form a uniformly downward magnetic field to compensate for the magnetic "void".

[0046] The adjacent exciting coils 2 are arranged at intervals. A plurality of magnetic yokes 3 for concentrating magnetic fields are provided outside the sorting cylinder 1. The plurality of magnetic yokes 3 are evenly distributed along the axial direction of the sorting cylinder 1 and are arranged at intervals. The magnetic yokes 3 are made of magnetic conductive materials. The magnetic yokes 3 have receiving grooves 31. The openings of the receiving grooves 31 face the sorting cylinder 1. The exciting coils 2 correspond to the magnetic yokes 3 one by one. The exciting coils 2 are embedded in the receiving grooves 31. The magnetic yokes 3 made of magnetic conductive materials form a semi-surrounding structure for the exciting coils 2, and the magnetic yokes 3 made of magnetic conductive materials armor the exciting coils 2 to play a magnetic shielding role. At the same time, the magnetic yokes 3 made of magnetic conductive materials can also form a magnetic circuit component. Based on the magnetic flux continuity law and Ohm's law, when the magnetic field generated by the exciting coil 2 acts on the magnetic yoke 3, the magnetic flux will form a loop inside the magnetic yoke 3 and flow through each area in the magnetic yoke 3, which can guide and concentrate the magnetic field lines generated by the exciting coil 2, guide the magnetic field to the required position and enhance the magnetic field intensity, contribute to improving the sensitivity and accuracy of the exciting circuit, make the excitation more stable and reliable, thereby using the magnetic field more efficiently, play a role in concentrating the magnetic field generated by the exciting coil 2, effectively prevent magnetic leakage, enhance the magnetic field intensity and magnetic field depth in the sorting cylinder 1 of the washing machine, reduce the magnetic attenuation phenomenon around the axis of the sorting cylinder 1, prevent the occurrence of magnetic "voids", ensure the full sorting of the minerals entering the sorting cylinder 1, and make it possible to enlarge the washing machine.

[0047] The control system is connected to all the exciting coils 2. The control system can separately control the energization of multiple exciting coils 2 belonging to the fixed coil group 21 and multiple exciting coils 2 belonging to the circulating coil group 22 alternately. The control system can cyclically excite the exciting coils 2 belonging to the circulating coil group 22 according to the set cycle time, and can steplessly adjust the exciting voltages of the fixed magnetic field group, the compensation magnetic field group, and the circulating magnetic field group; preferably, the control system is set as a PLC.

[0048] In other embodiments, the number of exciting coils 2 included in the fixed coil group 21, the circulating coil group 22, and the compensation coil group 23 can also be other values, as long as they can cooperate with each other to achieve ore dressing.

[0049] It should be noted that the exciting coil 2 is preferably wound with alloy electromagnetic wire; during the electromagnetic elutriation and beneficiation process, the magnetic field intensity of the fixed coil group 21 should be greater than that of the circulating coil group 22 and the compensation coil group 23; specifically, the magnetic field intensity range generated by the fixed coil group 21 is preferably set as 100 Gs - 250 Gs; the magnetic field intensity range generated by the circulating coil group 22 is preferably set as 30 Gs - 120 Gs; the magnetic field intensity range generated by the compensation coil group 23 is preferably set as 60 Gs - 200 Gs.

[0050] In a specific embodiment, the inner diameter of the sorting cylinder 1 is preferably set as 2.2 - 3.6 m. Correspondingly, there is a gap of 20 - 30 mm between the outer diameter of the sorting cylinder 1 and the inner diameter of the exciting coil 2. The thickness of the exciting coil 2 is set as 0.2 - 0.5 m, which can ensure that the magnetic field intensity at the axis of the sorting cylinder 1 is 30 - 80 Gs, having a good elutriation effect.

[0051] Specifically, please refer to Figure 1 and Figure 2 , the magnetic yoke 3 for concentrating magnetic field is fixedly connected to the sorting cylinder 1. A positioning component 36 is provided between adjacent magnetic yokes 3 for concentrating magnetic field to ensure that multiple magnetic yokes 3 for concentrating magnetic field are stably and evenly distributed along the axial direction of the sorting cylinder 1 at intervals. Specifically, the positioning component 36 can be set as a ring shape or multiple circumferentially distributed positioning blocks.

[0052] Furthermore, please refer to Figure 1 , the circulating coil group 22 is located above the water inlet 12, and the compensation coil group 23 is located below the water inlet 12. The flushing water enters the sorting cylinder 1 from the water inlet 12 and flows upward, continuously flushing the minerals at the position of the circulating coil group 22.

[0053] In this embodiment, please refer to Figure 1 , Figure 2 , Figure 4 and Figure 5, a magnetic conductive screen mesh 4 is preferably provided at the position corresponding to the excitation coil 2 inside the sorting cylinder 1. The magnetic conductive screen mesh 4 can conduct and disperse the magnetic field generated by the excitation coil 2, increasing the magnetic field width (amplitude) at each position of the sorting cylinder 1 corresponding to each excitation coil 2, and also helping to further improve the uniformity of the magnetic field inside the sorting cylinder 1.

[0054] It should be noted that in the present invention, the magnetic field depth refers to the magnetic field distribution in the radial inward direction along the sorting cylinder 1; the magnetic field width (amplitude) refers to the magnetic field distribution along the axial direction of the sorting cylinder 1. Since the length of the sorting cylinder 1 is relatively long, the magnetic field width (amplitude) generated by the excitation coil 2 is limited. After setting the magnetic concentrating yoke 3, the magnetic field width (amplitude) of each excitation coil 2 will be further reduced. By setting the magnetic conductive screen mesh 4, the magnetic field distribution of each excitation coil 2 can be extended along the magnetic field width (amplitude) direction, enabling a magnetic field with sufficient intensity to be distributed throughout the sorting cylinder 1, achieving a magnetic "void" - free area along the axial direction inside the entire sorting cylinder 1. And, it can also reduce the number of excitation coils 2 used, reducing costs. Further, a certain number of permanent magnets can also be set on the magnetic conductive screen mesh 4 to better assist in solving the magnetic "void" phenomenon.

[0055] Specifically, please refer to Figure 1 , Figure 2 , Figure 4 and Figure 5 , the magnetic conductive screen mesh 4 includes a magnetic conductive outer ring 41 fixedly connected to the sorting cylinder 1. Specifically, a positioning table is provided on the inner wall of the sorting cylinder 1 at each position corresponding to each magnetic conductive outer ring 41, and the magnetic conductive outer ring 41 is placed on the positioning table. A number of nested magnetic conductive inner rings 42 are provided inside the magnetic conductive outer ring 41. The magnetic conductive outer ring 41 and the number of magnetic conductive inner rings 42 are arranged in a concentric ring structure. The magnetic conductive outer ring 41 and the outermost magnetic conductive inner ring 42, as well as adjacent magnetic conductive inner rings 42, are all connected by a number of radial magnetic conductive plates 43. A number of axially distributed axial magnetic conductive plates 44 are provided on the magnetic conductive inner ring 42. The axial magnetic conductive plates 44 can also be provided with side branch magnetic conductive sheets extending in other directions, which can further improve the magnetic field conduction effect. In other embodiments, the axial magnetic conductive plates 44 can also be provided on the radial magnetic conductive plates 43, as long as the radiation area of the magnetic field can be effectively broadened.

[0056] Further, please refer to Figure 1 and Figure 2 , the magnetic conductive screen meshes 4 at the positions corresponding to each excitation coil 2 inside the sorting cylinder 1 are both set to two layers. The two layers of magnetic conductive screen meshes 4 are respectively located at the N - pole and S - pole of the magnetic field generated by the excitation coil 2. Further, the axial magnetic conductive plates 44 on the two layers of magnetic conductive screen meshes 4 should be staggered, which can avoid interference between the two layers of magnetic conductive screen meshes 4 and facilitate installation.

[0057] It should be noted that the magnetic conduction outer ring 41, the magnetic conduction inner ring 42, the radial magnetic conduction plate 43 and the axial magnetic conduction plate 44 are all made of magnetic conduction materials, specifically, they can be silicon steel, pure iron, Q235 carbon structural steel or magnetic conduction stainless steel.

[0058] In this embodiment, please refer to Figures 1 - 3 , the magnetic focusing yoke 3 includes an outer yoke plate 32, an upper yoke plate 33 and a lower yoke plate 34. The outer yoke plate 32, the upper yoke plate 33 and the lower yoke plate 34 can be spliced in sequence to form the receiving groove 31; in other embodiments, the magnetic focusing yoke 3 can also be an integrally formed structure, so as to be able to form the receiving groove 31 and effectively focus the magnetic field generated by the exciting coil 2.

[0059] It should be noted that Figures 6 - 8 is the magnetic field distribution cloud map after finite element simulation calculation using ansys magnetic field simulation software. In Figures 6 - 8 , in the direction from blue to red, the magnetic field intensity gradually increases; specifically, please refer to Figure 6 , the existing exciting coil 2 for the elutriator is an open magnetic system. After being energized, the magnetic field in the sorting cylinder 1 is a divergent magnetic field. The magnetic flux passes through a relatively long air gap between the magnetic poles, the magnetic resistance of the magnetic circuit is large, there is more leakage magnetic flux, and the magnetic field intensity is low, which is the so-called magnetic leakage phenomenon; for a super-large exciting coil 2, in the direction from the inner wall of the exciting coil 2 radially inward, the magnetic field gradually decreases, and finally a magnetic "void" will be formed around the axis of the exciting coil 2; due to the absence of the magnetic focusing yoke 3, the magnetic field is difficult to be concentrated to a specific position, resulting in a reduction in the energy utilization efficiency, and even may cause interference to surrounding equipment or affect its normal operation; correspondingly, please refer to Figure 7 and Figure 8 , the thicknesses of the outer yoke plate 32, the upper yoke plate 33 and the lower yoke plate 34 are respectively set to 10 mm and 50 mm. As the thickness of the yoke plate increases, the magnetic focusing effect on the magnetic field generated by the exciting coil 2 is better, the magnetic field intensity and magnetic field depth in the sorting cylinder 1 are also improved, the magnetic attenuation phenomenon around the axis of the sorting cylinder 1 is alleviated, the magnetic "void" area is significantly reduced, and the magnetic penetration depth of the exciting coil 2 is significantly increased.

[0060] It should be noted that the material of the magnetic focusing yoke 3 is preferably set to silicon steel or pure electrical iron, and the exciting coil 2 is preferably wound with alloy electromagnetic wire.

[0061] In this embodiment, please refer to Figure 1 , the present invention further includes a frame 5. The sorting cylinder 1 is fixed on the frame 5, and the frame 5 is used to provide support.

[0062] Furthermore, please refer to Figure 1, an outer cylinder 8 is sleeved outside the sorting cylinder 1, the outer cylinder 8 is fixed on the frame 5, and both the exciting coil 2 and the magnetic concentrating yoke 3 are located between the outer cylinder 8 and the sorting cylinder 1. The outer cylinder 8 is used to protect the exciting coil 2, the magnetic concentrating yoke 3 and the sorting cylinder 1.

[0063] Embodiment 2

[0064] Please refer to Figure 9 , the main difference between this embodiment and Embodiment 1 is that: the magnetic concentrating yoke 3 further includes magnetic shoes 35, the magnetic shoes 35 are respectively fixed on the upper yoke plate 33 and the lower yoke plate 34, and the thickness of the magnetic shoes 35 gradually decreases along the radially outward direction of the sorting cylinder 1. The magnetic shoes 35 can increase the pole area at both ends of the magnetic concentrating yoke 3. While the magnetic concentrating yoke 3 realizes magnetic concentration, it can also broaden the radiation area of the magnetic field in the axial direction of the sorting cylinder 1, that is, effectively increase the magnetic field width (amplitude) inside the sorting cylinder 1.

[0065] Specifically, the included angle between the inclined surface of the magnetic shoe 35 and the horizontal plane is preferably set to 25-50°, and the optimal magnetic concentrating effect can be achieved.

[0066] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An exciting device for preventing magnetic cavities in an extra-large electromagnetic elutriation separator, characterized in that, Comprising: A vertically arranged sorting cylinder (1), an overflow assembly (6) is provided at the top of the sorting cylinder (1), a feeding assembly (7) is stacked on the overflow assembly (6), and the lower end of the feeding assembly (7) extends into the sorting cylinder (1); a concentrate discharge port (11) is provided at the bottom of the sorting cylinder (1), and a water inlet (12) is provided at the side of the sorting cylinder (1); outside the sorting cylinder (1), a fixed coil group (21), a circulating coil group (22), and a compensation coil group (23) are sleeved from top to bottom in sequence. The fixed coil group (21), the circulating coil group (22), and the compensation coil group (23) each include a plurality of exciting coils (2), and adjacent exciting coils (2) are arranged at intervals. A plurality of magnetic concentrating yokes (3), the magnetic concentrating yokes (3) correspond to the exciting coils (2) one by one, the magnetic concentrating yokes (3) are sleeved outside the sorting cylinder (1), the magnetic concentrating yokes (3) have receiving grooves (31), the openings of the receiving grooves (31) face the sorting cylinder (1), and the exciting coils (2) are embedded in the receiving grooves (31); the magnetic concentrating yokes (3) are made of a magnetic conductive material. A control system, the control system is connected to all the exciting coils (2), and the control system can separately control the exciting coils (2) belonging to the fixed coil group (21) and the exciting coils (2) belonging to the circulating coil group (22) to be alternately energized.

2. The exciting device for preventing magnetic cavities of an extra-large electromagnetic elutriation separator according to claim 1, characterized in that, Magnetic conductive sieves (4) are provided at positions corresponding to the exciting coils (2) inside the sorting cylinder (1).

3. An exciting device for preventing magnetic cavities in an extra-large electromagnetic elutriation separator according to claim 2, characterized in that, The magnetic conductive sieve (4) includes a magnetic conductive outer ring (41) fixedly connected to the sorting cylinder (1), a plurality of nested magnetic conductive inner rings (42) are provided inside the magnetic conductive outer ring (41), and a plurality of radial magnetic conductive plates (43) are connected between the magnetic conductive outer ring (41) and the outermost magnetic conductive inner ring (42) and between adjacent magnetic conductive inner rings (42). A plurality of axially distributed axial magnetic conductive plates (44) are provided on the magnetic conductive inner rings (42). And / or, the magnetic conductive sieves (4) at positions corresponding to each exciting coil (2) inside the sorting cylinder (1) are both set to two layers.

4. An exciting device for preventing magnetic cavities in an extra-large electromagnetic elutriation and beneficiation machine according to claim 1, characterized in that, The magnetic concentrating yoke (3) includes an outer magnetic yoke plate (32), an upper magnetic yoke plate (33), and a lower magnetic yoke plate (34), and the outer magnetic yoke plate (32), the upper magnetic yoke plate (33), and the lower magnetic yoke plate (34) are spliced to form the receiving groove (31).

5. An exciting device for preventing magnetic cavities in an extra-large electromagnetic elutriation separator according to claim 4, characterized in that, The magnetic concentrating yoke (3) further includes a magnetic shoe (35), the magnetic shoe (35) is fixed on the upper magnetic yoke plate (33) and / or the lower magnetic yoke plate (34), and the thickness of the magnetic shoe (35) gradually decreases along the radially outward direction of the sorting cylinder (1).

6. An exciting device for preventing magnetic cavities in an extra-large electromagnetic elutriation separator according to claim 1 or 4, characterized in that, The thicknesses of the outer magnetic yoke plate (32), the upper magnetic yoke plate (33), and the lower magnetic yoke plate (34) are all set to 10 - 50 mm; And / or, the material of the magnetic concentrating yoke (3) is set to silicon steel or pure electrical iron.

7. An exciting device for preventing magnetic cavities in an extra-large electromagnetic elutriation separator according to claim 1, characterized in that, The exciting coil (2) is wound by an alloy electromagnetic wire; And / or, the fixed coil group (21) includes two of the exciting coils (2), and the magnetic field strength range of the fixed coil group (21) is set to 100 Gs - 250 Gs; And / or, the circulating coil group (22) includes five of the exciting coils (2), and the magnetic field strength range of the circulating coil group (22) is set to 30 Gs - 120 Gs; And / or, the compensation coil group (23) includes one of the exciting coils (2), the compensation coil group (23) can form a uniformly downward magnetic field, and the magnetic field strength range of the compensation coil group (23) is set to 60 Gs - 200 Gs; And / or, the circulating coil group (22) is located above the water inlet (12), and the compensation coil group (23) is located below the water inlet (12).

8. An exciting device for preventing magnetic cavities in an extra-large electromagnetic elutriation separator according to claim 1, characterized in that, The inner diameter of the sorting cylinder (1) is not less than 2.2 m.

9. The exciting device for preventing magnetic cavities of an extra-large electromagnetic elutriation separator according to claim 1, characterized in that, It further includes a frame (5), and the sorting cylinder (1) is fixed to the frame (5).

10. An exciting device for preventing magnetic cavities in an extra-large electromagnetic elutriation and beneficiation machine according to claim 9, characterized in that, A positioning component (36) is provided between adjacent magnetic yokes for concentrating magnetic fields (3); And / or, the magnetic yokes for concentrating magnetic fields (3) are fixedly connected to the sorting cylinder (1); And / or, an outer cylinder (8) is sleeved outside the sorting cylinder (1), the outer cylinder (8) is fixed to the frame (5), and both the exciting coil (2) and the magnetic yokes for concentrating magnetic fields (3) are located between the outer cylinder (8) and the sorting cylinder (1).

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