KR101411465B1 - Magnetic separator and magnetic drum for the same - Google Patents

Abstract

A transportation part for transporting the sample in which the magnetic particles and the nonmagnetic particles are mixed to facilitate the control of the magnetic field to the input current and to improve the sorting efficiency of the magnetic material so that the density of the magnetic force lines is uniformly distributed on the surface of the magnetic drum. And at least one magnetic drum positioned above the transport unit and adsorbing and sorting magnetic particles in a sample transported by generating a magnetic field, wherein the magnetic drum includes a plurality of drum units wound around the coils and disposed along the axial direction, And the magnetic drum has a structure in which magnetic field intensity of each drum unit differs from the center to both ends along the axial direction.

Description

TECHNICAL FIELD [0001] The present invention relates to a magnetic drum for a magnetic separator and a magnetic separator,

More particularly, the present invention relates to a magnetic separator for more efficiently selecting magnetic particles included in a fine pulverized ore material, and a magnetic drum for magnetic force selection and sorting.

Recently, there is no economic efficiency as a countermeasure against the depletion of mineral resources, but efforts are being actively made to improve the quality of low-grade minerals rich in reserves and to make them effective resources. Several types of wet or physical sorting methods have been used to improve the quality of lower-grade minerals. The wet sorting method has a high sorting efficiency, but there are problems such as a rise in the process ratio due to the water treatment cost after the sorting and inadequacy of the mass production, and thus, a continuous improvement work has been made on the physical sorting method.

Among the physical sorting methods, the magnetic separation method is an extremely simple sorting method applicable to the case where the impurity particles contained in the raw material are magnetic materials of a metal material, which is advantageous in that the process ratio is lower than the wet sorting method. Therefore, various kinds of devices for magnetic force selection are commercialized and used in related industries. The magnetic force sorting device mainly uses a rare earth magnet to generate a strong magnetic field, and thus, it is a mainstream to select a magnetic substance having a relatively large size.

However, in the conventional magnetic separator, the size of the sorting object is not suitable for a fine powder having a size of 1 mm or less or a few tens of microns, and there is a limitation in arbitrarily adjusting the strength of the magnetic force.

Unlike permanent magnet type, HGMS (High Gradient Magnetic Separator) is used to select the fine powder by adjusting the magnetic force by controlling the applied current. However, since the range of the adjustable magnetic force is at least several thousand Gauss (Gauss) to several tesla (Tesla), the magnetic susceptibility is selected to be several hundred times smaller than the ferromagnetic material. Therefore, in the conventional sorting apparatus, when a raw material containing a magnetic substance and a filamentous substance is selected, adsorbed on the electromagnet to an undesired mineral component in addition to the magnetic substance has a problem that the sorting efficiency is low and the sorting is impossible.

In the case of the magnetic separator equipped with a magnetic drum in the related art, it is possible to sort the fine powder, but the magnetic force lines generated on the surface of the magnetic drum are not uniformly distributed.

In order to select and select only the desired constituent materials, the magnetic field distribution on the surface of the magnetic drum should be uniform and the magnetic field intensity should be controllable. However, such a technology has not been developed yet.

Conventionally, the sorting operation has been carried out while moving the sample by using a conveyor. In such a structure, the sample is required to be reintroduced into the conveyor in the process of repeating the sorting operation in order to increase the sorting efficiency. In addition, when the conveyor belt is made of a material which is easy to generate static electricity, there arises a problem that the sample adheres to the conveyor belt due to the generation of static electricity, which makes it difficult to sort the conveyor belt.

Accordingly, there is provided a magnetic force selecting device and a magnetic drum for a magnetic force selecting device, which are capable of easily controlling a magnetic field with respect to an applied current and uniformly distributing the magnetic flux density on the surface of the magnetic drum.

Also, there is provided a magnetic force sorting apparatus and magnetic drum for a magnetic force sorting apparatus that can perform a repetitive sorting operation more easily and efficiently.

The present invention also provides a magnetic separator and a magnetic drum for a magnetic separator which are capable of precise and efficient sorting irrespective of the particle size of the object to be sorted.

The present magnetic separator comprises a transport section for transporting a sample in which magnetic particles and non-magnetic particles are mixed, and a magnetic field generation section positioned above the transport section and adapted to generate magnetic fields by a magnetic field, And at least one magnetic drum.

The magnetic drum is characterized in that the intensity of the magnetic field varies along the longitudinal direction. In particular, the intensity of the magnetic field decreases toward both ends in the longitudinal direction center.

The magnetic drum may include a plurality of coils wound on the drum unit, and the magnetic field strength of the drum unit may be reduced toward both ends of the magnetic drum in the longitudinal center direction.

The magnetic drum may further include an insulator interposed between neighboring drum units.

As described above, according to the present apparatus, the density difference of the magnetic lines of force generated on the surface of the magnetic drum is minimized, and the magnetic line density is uniformly distributed.

Further, as the raw material is repeatedly passed through the magnetic drum by using the rotary disk structure, the repeated sorting operation can be performed more easily and the working efficiency can be improved.

In addition, it is possible to maximize the screening efficiency by precisely controlling the gap with the magnet drum according to the particle size of the ground minerals.

In addition, it is possible to select the minerals of the magnetic component from the crushed minerals with a high degree of certainty, so that the low-grade minerals can be made high-quality and economic efficiency can be ensured.

In addition, since the problem of the electrostatic force generated when the sample is conveyed using the conventional conveyor belt is not originally generated, the sorting efficiency can be further increased.

1 is a front view showing a magnetic force sorting apparatus according to the present embodiment.
2 is a plan view showing a magnetic separator according to this embodiment.
3 is a schematic sectional view showing a drum unit of a magnetic drum according to the present embodiment.
4 is a schematic cross-sectional view showing a magnetic drum of the magnetic separator according to the present embodiment.
5 is a schematic cross-sectional view showing a magnetic drum of a magnetic separator according to another embodiment of the present invention.
FIGS. 6 and 7 are graphs showing changes in the magnetic field intensity according to the applied current in the magnetic drum according to the present embodiment and the comparative example.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Wherever possible, the same or similar parts are denoted using the same reference numerals in the drawings.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like.

All terms including technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. Predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

FIG. 1 is a front view of the magnetic force sorting apparatus according to the present embodiment, and FIG. 2 is a plan view of the magnetic force sorting apparatus shown in FIG.

1 and 2, the magnetic separator 100 of the present embodiment includes a transport section 10 for transporting a sample in which magnetic particles and non-magnetic particles are mixed, And at least one magnetic drum (20) for generating a magnetic field for adsorbing and sorting magnetic particles in a sample to be transported.

The magnetic drum 20 is rotatably mounted on a supporting base 32 vertically installed on a facility frame 30 of the present apparatus 100 via a rotary shaft 34. The support base 32 is installed on opposite sides of the facility frame 30 to support both ends of the rotation shaft 34. On the facility frame 30, a transportation part 10 is located, and the magnetic drum 20 is disposed directly above the transportation part 10. [

The magnetic drum 20 is coupled to the rotating shaft 34 and rotates at a specified speed. A drive motor 36 connected to the rotary shaft 34 and rotating the magnetic drum 20 installed on the rotary shaft 34 is installed on the one side support table 32. When the driving motor 36 is operated, the magnetic drum 20 installed on the rotating shaft is rotated in one direction. The rotational speed of the magnetic drum may be varied as needed.

The magnetic drum has a structure in which a plurality of drum units wound with coils are arranged along a rotary shaft. The detailed structure of the magnetic drum 20 will be described later in detail.

The magnetic drum 20 is connected to a coil and is connected to a brush, which supplies a current to the coil, and a commutator, which performs a rectifying function, and is supplied with a current necessary for generating a magnetic force.

As shown in FIG. 1, the transport unit 10 includes a disk 11 horizontally disposed under the magnetic drum 20 so as to be rotatable, and a driving unit for rotating the disk 11. The transport unit 10 may further include a supply unit 40 for supplying a sample onto the disk 11. [

In the present embodiment, the disk 11 is in the form of a disk. The rotating shaft 34 of the disk 11 is positioned at the center of the disk 11 and is axially coupled to the work table 12 at the upper end of the equipment frame 30. [ A driving unit is installed below the work table 12. The driving unit may include a driving motor 13 connected to the rotating shaft 34 of the disk 11 to rotate the disk 11 at a predetermined speed.

When the drive motor 13 is operated, the disc 11 rotates under the magnetic drum 20 with respect to the work table 12 and the sample placed on the disc 11 is moved to the magnetic drum 20 in accordance with the rotation of the disc 11, It goes under. The rotational speed of the disk may vary as needed.

The disk 11 may be made of a metal material. The disc may be formed of any material that can minimize the generation of electrostatic force in addition to a metal material. Since the sample is transported through the metal disk, the phenomenon that the sample is adhered to the transportation part or the magnetic drum by the electrostatic force during transportation can be minimized compared to the structure using the conventional conveyor belt. Therefore, the sorting efficiency can be increased.

FIG. 2 is a plan view of the present apparatus 100 and illustrates the arrangement state of the disk 11 and the magnetic drum 20 well. 2, the rotary shaft 34 of the magnetic drum 20 of this embodiment is disposed so as to pass through the rotation center axis of the disk 11. As shown in Fig. Two magnetic drums 20 are installed on the rotary shaft 34. Each of the magnetic drums 20 is formed to have a length substantially corresponding to the radius of the disk 11 and is disposed symmetrically with respect to the center axis of the disk 11. Each of the magnetic drums 20 is disposed on the disk 11 at intervals of 180 degrees with the central axis of the disk 11 interposed therebetween and is located on the region between the central axis of the disk 11 and the tip of the disk 11 .

The apparatus may have a single magnetic drum in addition to the structure described above. The single magnetic drum may be disposed only between the disk central axis and the disk front end, or may be disposed on the disk with a size corresponding to the diameter of the disk 11.

In this way, the sample transport unit 10 has the structure of the disk 11, and the sample supplied on the disk 11 is repeatedly passed through the magnetic drum 20 as the disk 11 rotates. Therefore, it is possible to repeatedly perform the sorting operation on the sample without re-inputting the sample passing through the magnetic drum 20 to the transporting unit 10.

Here, the conveying portion of the present embodiment illustrates a structure in which the transport of the sample makes the relative movement structure of the disk relative to the magnetic drum, but the present invention is not limited thereto. For example, the transport part may be a structure for relatively moving the magnetic drum relative to the disk. With such a structure, the magnetic drum rotates in its own axis direction and simultaneously moves on the disk about the center of the disk. As a result, the magnetic drum can be repeatedly subjected to the sorting operation while passing through the sample placed on the disk.

The supply unit 40 is for supplying a sample onto the disk 11. The supply unit 40 includes a vibrating feeder 42 having an inlet 41 into which a sample is inputted and for dispersing and discharging a predetermined amount of the sample, 11), and a transport guide (43) for transporting the sample, which is discharged from the vibration feeder, to the upper portion of the disk (11).

The sample is supplied to the vibration feeder 42 and is conveyed along the conveyance guide 43 according to the driving of the vibration feeder 42 and put into the upper part of the disk 11.

The magnetic particles selected by the magnetic drum (20) are processed through an inhaler (50). The inhaler 50 extends in the axial direction of the magnetic drum 20 and is arranged close to the respective magnetic drums 20 to collect the magnetic particles attached to the magnetic drums 20. In the present embodiment, the inhaler 50 may be configured to suck and collect the magnetic particles using the air suction pressure.

The apparatus (100) further includes a processor (52) for picking up the remaining samples selected on the disk (11). The processor 52 is disposed above the disk 11 and extends from the end of the disk 11 to the center axis of the disk 11 to collect the sample. In the present embodiment, the processor 52 may be configured to suck and collect the sample using the air suction pressure.

Accordingly, the sample transferred onto the disk 11 is repeatedly passed under the magnetic drum 20 according to the rotation of the disk 11, and magnetic particles are attached to the magnetic drum 20 and sorted. The selected magnetic particles are separated from the magnetic drum 20 by the suction pressure of the inhaler 50 and collected. The magnetic particles are separated and the remaining sample is sucked from the disk 11 and processed by the suction pressure of the processor 52 as the processor 52 disposed on the disk 11 is driven.

The transport unit 10 of the present apparatus 100 further includes a gap adjusting unit 60 for adjusting the gap between the disk 11 and the magnetic drum 20. The gap adjusting unit 60 adjusts the distance between the disc 11 on which the sample is placed and the magnetic drum 20 disposed on the disc 11 according to the particle size of the sample to be sorted.

The spacing adjusting unit 60 includes a worktable 12 on which the disk 11 is installed and is vertically movable so as to be separated from the equipment frame 30. The space between the equipment frame 30 and the worktable 12 The elevating portion for elevating and lowering the moving member relative to the equipment frame 30 is provided.

The gap adjusting unit 60 has a structure in which the entire worktable 12 on which the disk 11 is mounted is moved up and down with respect to the equipment frame 30 and is affected by the rotation of the disk 11 relative to the worktable 12 It is possible to move the disk 11 up and down with respect to the equipment frame 30. [

As shown in FIGS. 1 and 2, the work table 12 is a rectangular structure in which the disk 11 is placed, and the elevation portion is installed at each corner.

The elevating unit includes a conveying screw 61 vertically installed on the equipment frame 30 and screwed to the work table 12, a conveying screw 61 installed on the equipment frame 30 and connected to the conveying screw 61, And a normal / reverse motor 63 for rotating the motor in normal and reverse directions.

A female screw hole (62) is formed in the work table (12) to be screwed with the feed screw (61). The female screw holes 62 are formed at the four corners of the worktable 12 and fastened to the feed screws 61, respectively. The feed screw 61 is vertically installed on the equipment frame 30 and extends upwardly through the female screw hole 62 of the work table 12. The machine frame 30 is provided with a forward / reverse motor 63 for rotating the feed screw 61. A gear box 64 for transmitting the driving force of the forward / reverse motor 63 to the feed screw 61 may be further provided between the forward and reverse motors 63 and the feed screw 61.

When the forward / reverse motor 63 is driven in the forward direction or the reverse direction, the power is transmitted to the feed screw 61 through the gear box 64 to rotate the feed screw 61 in normal and reverse directions. The work table 12 fastened to the feed screw 61 through the female screw hole 62 moves up and down along the feed screw 61 as the feed screw 61 rotates. The distance between the disk 11 installed on the work table 12 and the magnetic drum 20 fixed to the equipment frame 30 is shifted up and down with respect to the equipment frame 30.

The disk 11 can continue to rotate with respect to the work table 12 as the disk 11 moves along with the work table 12 on which the disk 11 is mounted. That is, as the workbench 12 moves, the disk 11 installed on the workbench 12 and the drive motor for rotating the disk 11 are moved together with the workbench 12. Accordingly, when the drive motor is operated, the disc 11 is rotated with respect to the work table 12 irrespective of the position of the work table 12.

By thus moving the position of the disk 11 on which the sample is placed with respect to the magnetic drum 20 fixed in position up and down so that the interval between the disk 11 and the magnetic drum 20 is adjusted to the particle size of the sample . For example, when the particle size of the sample is small, the interval between the disk 11 and the magnetic drum 20 can be reduced by raising and lowering the work table 12.

Figures 3-5 illustrate a magnetic drum according to one embodiment.

The magnetic drum 20 has a structure in which a plurality of drum units 21 including a bobbin 22 wound with a coil 23 are stacked on a rotary shaft 34. In this embodiment, The number of the drum units 21 is not particularly limited.

As shown in Fig. 3, each drum unit 21 includes a bobbin 22 to which the coil 23 is wound. The bobbin 22 is constituted by a pair of circular supports 24 and a central connecting portion 25 which connects the centers of the pair of circular supports 24 and on which the coil 23 is wound. At the center of the bobbin 22, a through hole 26 through which the rotation shaft 34 is inserted is formed. The coil 23 is wound continuously on the outer surface of the central connecting portion 25 serving as a core on the region so that the coil 23 is wound between the two circular supports 24 and the central connecting portion 25.

In another embodiment, the magnetic drum according to the present invention may not be divided into several drum units but may be composed of a single magnetic drum. For example, the magnetic drums may be configured such that the grooves are formed at regular intervals along the longitudinal direction (in the circumferential direction), and the diameter of the coil or coil of the coil wound around the grooves decreases from the center to both ends. Here, the longitudinal direction means the axial direction of the magnetic drum.

The bobbin 22 constituting the drum unit 21 may be made of a metal material. The material of the bobbin 22 may be a polymer material having a permeability of 0, but when the material of the bobbin 22 is made of a polymer material, the intensity of the generated magnetic field is very low. The bobbin 22 is made of a metal material having a high magnetic permeability, which is easy to control the magnetic flux density generated on the surface of the magnetic drum 20.

The directions of the electric currents flowing through the coils 23 may be set to the same for all the drum units 21. The coil 23 wound around the bobbin 22 of each drum unit 21 is connected in series with the coil 23 wound around the bobbin 22 of the adjacent drum unit 21, It is wound.

Here, the magnetic field intensity of each drum unit differs from the center to both ends along the axial direction of the magnetic drum 20, so that the magnetic field distribution can be uniformed as a whole.

In this embodiment, the magnetic field intensity of each drum unit is changed by a structure in which the winding number of the coil wound on the bobbin differs for each drum unit, or the diameter of the coil wound around the bobbin varies for each drum unit.

4 is a cross-sectional view of a magnetic drum, illustrating a structure in which the number of coil turns is different for each drum unit.

As shown in FIG. 4, the number of turns of the coil 23 per unit length of each drum unit 21 from the center to both ends along the axial direction (hereinafter, And the number of turns of the coil is referred to as coil winding number). In the present embodiment, the number of coil windings of each drum unit 21 may gradually decrease from the center to both ends along the axial direction of the magnetic drum.

That is, the magnetic drum 20 has the largest number of coil windings wound around the bobbin 22 of the drum unit 21 disposed at the center, and the number of coil windings wound around the bobbin 22 of the drum unit 21 The number of coil windings wound on the bobbin 22 of the drum unit 21 at the uppermost stage is gradually reduced to have the smallest number of coil windings.

Since the intensity of the magnetic force is proportional to the coil winding speed, the intensity of the magnetic force in the magnetic drum 20 becomes weaker from the center to both ends.

Since the magnetic force between the drum units 21 becomes smaller toward both ends of the magnetic drum 20 even if the magnetic force lines are concentrated toward both ends along the axial direction of the magnetic drum 20, the magnetic field is uniformly distributed over the entire surface of the magnetic drum 20 .

The reduction ratio of the coil winding speed between the drum units 21 of the magnetic drum 20 may vary depending on the number of the drum units 21, the current applied to the coil 23, and the like, and is not particularly limited.

As shown in FIG. 4, in order to differentiate the coil winding pitch between the drum units in the magnetic drum, each drum unit has a structure in which the central connecting portions of the bobbins have different sizes. In the present embodiment, the magnetic drum has a structure in which the outer diameter of the central connecting portion 25 constituting the bobbin of each drum unit 21 gradually increases from the center to both ends along the axial direction.

That is, the outer diameter of the central connecting portion of the bobbin 22 is the smallest in the drum unit 21 disposed at the center of the magnetic drum 20, and the outer diameter of the central connecting portion of each drum unit 21 And the outer diameter of the central connecting portion of the drum unit 21 at the uppermost end is the largest.

The bobbin 22 is wound with a coil 23 in a space between the central connection portion 25 and two circular supports 24 disposed at both ends of the central connection portion. Accordingly, when the outer diameter of the central connecting part 25 is changed, the size of the space is changed.

The size of the region where the coils are wound in the bobbins of the drum units is the largest in the drum unit disposed at the center of the magnetic drum and becomes gradually smaller toward the drum units at both ends along the axial direction of the magnetic drum. The number of turns of the coil can be varied depending on the size of the space.

Therefore, when the coil is wound around the bobbin of each drum unit, the number of coil turns of the drum unit becomes smaller toward the both ends from the center along the axial direction of the magnetic drum in case of coils of the same diameter.

As described above, when the coil is completely wound on the bobbin, the number of coil windings is different for each drum unit by changing the size of the region where the coil is wound on the bobbin.

5 is a cross-sectional view of a magnetic drum according to another embodiment, illustrating a structure in which diameters of coils are different for each drum unit.

As shown in FIG. 5, the magnetic drum has a structure in which diameters of the coils 23 wound on the bobbins of the drum units 21 are different from each other along the axial direction from the center to both ends. In the present embodiment, the coil diameter of each of the drum units 21 may be gradually decreased from the center to both ends along the axial direction of the magnetic drum.

That is, the magnetic drum 20 has the largest diameter of the coil wound around the bobbin 22 of the drum unit 21 disposed at the center, and the diameter of the coil wound around the bobbin 22 of the drum unit 21 increases toward both ends along the axial direction. The diameter of the coil wound on the bobbin 22 of the drum unit 21 at the uppermost end is the smallest.

When the number of coil windings is the same, the magnitude of the magnetic force is proportional to the diameter of the coil, so that the intensity of the magnetic force in the magnetic drum 20 becomes weaker toward the both ends from the center.

Since the magnetic force between the drum units 21 becomes smaller toward both ends of the magnetic drum 20 even if the magnetic force lines are concentrated toward both ends along the axial direction of the magnetic drum 20, the magnetic field is uniformly distributed over the entire surface of the magnetic drum 20 .

The reduction ratio of the coil diameter between the drum units 21 of the magnetic drum 20 may be varied depending on the number of the drum units 21, the current applied to the coil 23, and the like, and is not particularly limited.

As shown in FIG. 5, in order to make the coil diameters of the drum units different from each other in the magnetic drum, each drum unit has a structure in which the central connecting portion sizes of the bobbins are different. In the present embodiment, the magnetic drum has a structure in which the outer diameter of the central connecting portion 25 constituting the bobbin of each drum unit 21 gradually increases from the center to both ends along the axial direction.

As described above, the size of the region where the coil is wound in the bobbin of each drum unit is largest in the drum unit disposed at the center of the magnetic drum, and becomes gradually smaller toward the drum units at both ends along the axial direction of the magnetic drum. Therefore, when the coils are wound around the bobbin of each drum unit, the diameter of the coil wound around the drum unit can be increased along the axial direction of the magnetic drum from the both ends toward the center.

As is known, the electromagnet has a structure for generating a magnetic force by winding the coil 23 around the core. The strength of the magnetic force is proportional to the coil winding wound around the core, the charging current, and the diameter of the coil. In magnetic force selection using an electromagnet, generating a uniform magnetic field around the core is the most important factor required in the magnetic separator. This is because, when the intensity of the magnetic field distributed on the surface of the magnetic drum becomes uneven, it is almost impossible to control the intensity of the magnetic field generated on the surface of the magnetic drum by the applied current.

That is, when there is a region generating a strong magnetic force on the surface of the magnetic drum and a region generating a weak magnetic force and a large difference in magnetic force between these regions, unwanted particle inflow can not be suppressed when the sample is sorted. Therefore, there is a limit in deriving the optimum sorting condition (optimal magnetic force) for minimizing the loss of the target metal and increasing the recovery rate in mineral sorting. Conventional magnetic drums exhibit characteristics in which the peak of the magnetic field strength is the largest and the magnetic force lines become narrower toward the center due to the magnetic lines of force being concentrated at the N pole and S pole at both ends on the characteristic of the magnetic field generation characteristic. Thus, the conventional magnetic drum can not uniformly distribute the magnetic field on the surface.

The magnetic drum 20 of the present embodiment has a structure in which the number of the coil turns or the diameter of the coils is varied by dividing the magnetic drum 20 into a plurality of drum units 21 in the longitudinal direction of the magnetic drum. Accordingly, the magnetic drum 20 weakly forms the magnetic force of each drum unit toward the both ends from the center of the magnetic drum. Therefore, as mentioned above, the magnetic drum 20 can uniformly form a magnetic field on the entire surface of the magnetic drum 20 along the axial direction.

The magnetic drum 20 of the present embodiment may further include an insulator 70 disposed between the drum units 21 to insulate the neighboring drum units 21 from each other. The plurality of drum units 21 are stacked on the rotating shaft 34 in a state of being in close contact with the adjacent insulator 70.

When a current is supplied to the coil 23, a magnetic force is generated in each of the drum units 21 to form an N pole and an S pole. At this time, the insulator 70 stacked between the plurality of drum units 21 cuts off the formation of a magnetic path between the neighboring drum units 21. Accordingly, it is possible to further minimize the phenomenon that the lines of magnetic force are concentrated at both ends of the magnetic drum 20 through the cutoff of the magnetic path. Accordingly, by providing the insulator, the magnetic drum 20 of the present embodiment can further minimize the sudden change of the magnetic field distribution on the surface at both ends along the axial direction, and further increase the uniformity.

As described above, the magnetic drum 20 of the present embodiment solves the non-uniform problem of the magnetic field generated by the crowded magnetic lines of force at both the left and right ends, and the magnetic field distribution can be generated evenly on the surface of the magnetic drum 20.

Hereinafter, the operation of the present apparatus 100 will be described.

When the present apparatus 100 is driven, the disc 11 is rotated on the work table 12, and the magnetic drum 20 is rotated at a predetermined distance from the top of the disc 11.

The disk and the magnetic drum rotate independently of each other. The rotational speed of the disk and the rotational speed of the magnetic drum may affect the sorting efficiency of the sample. Therefore, the efficiency of sorting the sample can be improved by individually controlling and optimizing the rotation speed of the disk and the rotation speed of the magnetic drum according to the conditions and conditions of the sample.

The pulverized sample to be classified is put into the funnel-shaped inlet 41 and the vibrating feeder 42 is driven to drop the sample on the rotating disk 11 through the conveying guide 43. [

The sample placed on the disk 11 passes through the magnetic drum 20 in accordance with the rotation of the disk 11. [ When the sample is transferred directly under the rotating magnetic drum 20, only the magnetic particles in the sample are attached to the surface by the magnetic force formed on the surface of the magnetic drum 20, and the non-magnetic component is attracted to the magnetic drum 20 It passes through.

Here, in the present apparatus 100, two magnetic drums 20 are arranged at intervals of 180 degrees, so that magnetic particles are firstly sorted by the one magnetic drum 20 in accordance with the rotation of the disk 11. The sample having passed through the one magnetic drum 20 passes through the lower portion of the other magnetic drum 20 in accordance with the rotation of the disk 11. [ At this time, the magnetic particles remaining in the sample not being primarily sorted are passed through the other magnetic drum 20, and are secondarily sorted.

In the above-described sorting process, the magnetic drum 20 is formed with an even distribution of the entire magnetic field intensity along the axial direction. Accordingly, only the desired magnetic particles are selected precisely, and the magnetic particle sorting efficiency by the magnetic drum 20 can be increased.

The magnetic particles attached to the magnetic drum 20 are sucked and recovered by the inhaler 50 positioned near the surface of the magnetic drum 20. [ And the remaining non-magnetic component sample is sucked and recovered by the processor 52.

The disk 11 is rotated by a predetermined number of rotations. As a result, the sample is repeatedly passed through the magnetic drum 20, and the sorting operation is repeatedly performed. In general, since the sample can not be sufficiently purified by one-time screening, the screening process is repeated many times. Therefore, the present apparatus 100 simply rotates the disc 11, so that the sorting operation for the sample is repeatedly performed, so that the operation can be performed more easily and easily. In addition, it is possible to improve the sorting efficiency.

6 and 7 illustrate intensity variations of the magnetic field of the magnetic drum according to the present embodiment in comparison with the comparative example. To compare the flatness of the magnetic field intensity distribution, a magnetic drum with the following specifications was fabricated.

1) Embodiment

A magnetic drum was fabricated by laminating a drum unit and an insulator provided between the drum unit on a cylindrical iron bar. The coils wound on the bobbins of each drum unit were connected in series. The specifications of the magnetic drum of the manufactured embodiment are as follows.

Drum size: Diameter 45mm * Length 50mm

Number of drum units: 5

Bobbin size: Diameter 45mm * 9mm

Bobbin material: carbon steel (45C)

Coil diameter: 0.5mm

Insulator: 1 mm thick polycarbonate

In the embodiment, the coil spool wound around the bobbin of each drum unit is gradually reduced along the axial direction of the magnetic drum from the center toward both ends. When the drum units are sequentially numbered from one end to the other along the axial direction, the coil winding pitch for each drum unit is as follows.

Unit Bobbin No Kwon player (times) Remarks One 15 Left end 2 30 Between left end and center 3 50 center 4 30 Between center and right side 5 15 Right side

2) Comparative Example

The drums provided on the cylindrical iron bars formed grooves in the circumferential direction at regular intervals along the axial direction and wound coils of the same number of turns per groove. That is, as compared with the embodiment, the magnetic drum of the comparative example has a structure in which grooves serving as bobbins without an insulator are connected in series and integrated.

The specifications of the manufactured magnetic drum of the comparative example are as follows.

Drum size: Diameter 45mm * Length 40mm

Drum material: carbon steel (45C)

Coil diameter: 0.5mm

Home player: 50 times

Number of homes: 6

Spacing between grooves: 3 mm

The magnetic field strength of the magnetic drums of Examples and Comparative Examples was measured by measuring the intensity of magnetic field (magnetic flux density (Gauss)) generated on the surface of the magnetic drum with a magnetic field measuring probe (FW BELL, Model 6010) .

6 shows the change in the magnetic field intensity of the magnetic drum with respect to the comparative example. In Fig. 6, the abscissa axis indicates the axial measurement position of the magnetic drum. A value of 0 indicates the center position of the magnetic drum. As shown in Fig. 6, in the comparative example, the magnetic field intensity distribution has a structure in which the bones (portions where the coils are wound) and the mountains (portions where the coils are not wound between both ends of the coils) Shows a pattern in which a low portion corresponding to the valley and a high portion corresponding to the mountain repeatedly appear. In FIG. 6, the peak value having a strong magnetic field strength is getting smaller toward the center from both sides of the drum. That is, in the comparative example, the magnetic field intensity at both ends of the drum is strong and the magnetic field intensity at the center is weak, showing that the magnetic field strength is uneven.

On the other hand, as shown in FIG. 7, although the intensity of the magnetic field at both ends of the drum is somewhat high in the present embodiment, it is understood that the peak value is almost uniformly distributed in the axial direction front face of the magnetic drum within an error range of 10% have.

Therefore, the magnetic drum according to the present embodiment can form the magnetic field distribution on the surface very uniformly, thereby increasing the sorting efficiency of the magnetic particles.

In the above, measurement results for a magnetic drum having an insulator are described, but even if an insulator is not used, the distribution of the magnetic field is uniform to some extent. The magnetic force non-uniformity appears somewhat, but the peak value is substantially equal to that of the comparative example. Therefore, even in the case of a magnetic drum without an insulator, it is possible to increase the sorting efficiency of the magnetic particles through the above-described action and effect.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Of course.

10: transportation part 11: disk
12: work table 13, 36: drive motor
20: magnetic drum 21: drum unit
22: Bobbin 23: Coil
30: Equipment frame 32: Support
34: rotating shaft 40:
42: Vibrating feeder 43: Feed guide
50: inhaler 52: processor
60: Spacing adjuster 61: Feed screw
62: Female thread hole 63: Forward motor
70: Insulator

Claims (17)

At least one magnetic drum disposed at an upper portion of the conveying portion and configured to generate a magnetic field and adsorb and sort magnetic particles in the sample, / RTI >
Wherein the magnetic drum is configured such that the intensity of the magnetic field decreases as it goes from the center to both ends along the longitudinal direction. The method according to claim 1,
Wherein the magnetic drum includes a plurality of drum units wound with coils, and the magnetic field intensity of the drum unit becomes smaller toward both ends of the magnetic drum in the longitudinal center direction. 3. The method of claim 2,
Wherein the magnetic drum further comprises an insulator interposed between neighboring drum units. The method according to claim 1,
Wherein the magnetic drum is formed integrally with a plurality of grooves through which the coil is wound, and the coil winding or the coil diameter becomes smaller toward the both ends from the longitudinal center side of the magnetic drum. 4. The method according to any one of claims 1 to 3,
And the number of coil windings decreases from the center to both ends along the longitudinal direction of the magnetic drum. 4. The method according to any one of claims 1 to 3,
And the coil diameter of each drum unit decreases from the center to both ends along the longitudinal direction of the magnetic drum. 5. The method according to any one of claims 1 to 4,
Wherein the magnetic drum has a rotation axis arranged in a longitudinal direction thereof and is rotatable around the rotation axis. The method according to claim 2 or 3,
Wherein the drum units share a rotation axis disposed in the longitudinal direction of the magnetic drum and are rotatable about the rotation axis,
Each drum unit including a bobbin around which a coil is wound, the bobbin including a pair of circular supports, a central connection portion connecting the pair of circular supports,
Wherein the magnetic drum gradually increases in diameter from the center to both ends along the axial direction so that the diameter of the central connecting portion of the bobbin of each drum unit gradually increases. 8. The method of claim 7,
Wherein the transportation unit includes a disk horizontally disposed at a lower portion of the magnetic drum, and a driving unit for relatively rotating the magnetic drum and the disk. 10. The method of claim 9,
Wherein the disk is rotatably installed in a facility frame for supporting the disk, and the facility frame is provided with a drive motor connected to a rotation axis of the disk to rotate the disk with respect to the magnetic drum. 10. The method of claim 9,
And a gap between the disk and the magnetic drum can be adjusted. 10. The method of claim 9,
Wherein the rotary shaft of the magnetic drum is disposed to pass through a center portion of the disk, and a plurality of magnetic drums are spaced apart along the rotary shaft. 10. The method of claim 9,
Wherein the rotation speed of the rotation shaft of the magnetic drum and the rotation speed of the disk relative to the magnetic drum are individually controllable. In a magnetic drum of a magnetic separator,
Wherein the magnetic drum includes a plurality of coils wound around the drum unit, and the magnetic field intensity of the drum unit is decreased from the center toward both ends along the longitudinal direction of the magnetic drum. delete 15. The method of claim 14,
Wherein the magnetic drum further comprises an insulator interposed between neighboring drum units. 17. The method of claim 16,
Wherein the drum units share a rotation axis disposed in the longitudinal direction of the magnetic drum and are rotatable about the rotation axis,
Each drum unit including a bobbin around which a coil is wound, the bobbin including a pair of circular supports and a central connection connecting the pair of circular supports,
Wherein the magnetic drum gradually increases in diameter from the center to both ends of the magnetic drum in the axial direction so that the diameter of the central connecting portion of the bobbin of each drum unit gradually increases.

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