JP2001276646A - Magnetic roller and magnetic separator using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic roller which is capable of generating strong magnetic force and a magnetic separator using the same. SOLUTION: The magnetic separator 10 has plural annular permanent magnets 19 and 20 which are arranged apart prescribed spacings in the axial direction of a revolving shaft 14 and of which the directions of the respective magnetic poles face the axial direction of the revolving shaft and magnetic induction disks 15 which consist of ferromagnetic materials having the same outside diameters of the permanent magnets 19 and 20 or having the size larger within a slight range from the outside diameters of the permanent magnets 19 and 20. The magnetic poles of the permanent magnets 19 and 20 facing each other via the magnetic induction disks 15 have a magnetic roller 11 having same polarity and a magnetized material transporting belt 12 of a small thickness connecting the magnetic roller 11 and a driven roller and a drive source and separate weakly magnetic materials.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic roller and a magnetic separator using the same, and more particularly, to a magnetic roller capable of selecting a weak magnetic material by strengthening a magnetic field and a magnetic roller using the same. Regarding the sorting machine.

[0002]

2. Description of the Related Art Conventionally, a magnetic roller provided with a plurality of permanent magnets has been used in a magnetic separator. Magnets used in magnetic rollers can change the direction and strength of the magnetic field lines formed depending on their arrangement and type, and attempts have been made to improve the sorting efficiency by changing this arrangement. For example, JP-B-57-43310 and JP-B-62-54547 disclose that magnets arranged around a drum at a predetermined interval have the same polarity, and magnetic lines of force generated from the magnet are substantially applied to the peripheral surface of the drum. An apparatus is described that attempts to increase the sorting efficiency by being vertical. On the other hand, there is also a method in which a rubber belt is wound around a magnetic roller, and a raw material is put on the rubber belt to perform sorting.

[0003]

However, in the conventional magnetic force sorter, since the magnets are arranged at predetermined intervals, the magnetic flux density depends on the magnetic flux density of the permanent magnet used alone. Even when a rare earth magnet such as Nd (neodymium) having a magnetic flux density was used, its magnetic flux density was about 5000 Gauss. Generally, austenitic stainless steel is a non-magnetic material, but it is known that martensitic transformation occurs partially due to plastic deformation due to cutting or thermal shock or the like, and the material becomes a magnetic material. When only a part of the structure becomes magnetically attached due to cutting or the like, when sorting such a weakly magnetically attached material as a magnetically attached material, a higher magnetic flux density was required than in the past. Since there is no means for increasing the magnetic flux density in the machine, it was not possible to collect the permanent magnet without increasing the volume, weight, and cost of the permanent magnet. on the other hand,
Conventionally used rubber belts have a thickness of about 6 to 7 mm. As is generally known,
Since the magnetic force is inversely proportional to the square of the distance from the magnet, there is a problem that the use of a belt lowers the sorting efficiency. In order to solve these problems, the present applicant is a magnetic roller in which a plurality of magnetism generating units that generate a magnetic field on the outside in the radial direction are arranged along the axial direction of the rotating shaft, and the magnetism generation unit has a strong magnetic field. First and second fixing disks made of a magnetic material and opposed to each other with a gap therebetween, and annular first and second fixing disks fixed to opposing inner surfaces of the first and second fixing disks. The second permanent magnet and the outer peripheral portions of the first and second permanent magnets arranged opposite to each other are continuously covered, and a non-magnetic member is provided in accordance with the outer diameter of the first and second fixing disks. The invention invents a magnetic roller having a protective cover made of a magnetic material, wherein the first and second permanent magnets are configured such that magnetic poles of the same polarity face each other with a gap. With such a configuration, the above-described magnetic roller succeeded in generating a magnetic flux density about 1.8 times as strong as that of the permanent magnet alone from the gap between the magnetic poles arranged opposite to each other. However, depending on the type of weakly magnetically adhered material, this magnetic flux density may not be sufficient, and it has been desired to further increase the magnetic flux density. The present invention has been made in view of the above circumstances, and has as its object to provide a magnetic roller capable of generating a strong magnetic force and improving the sorting efficiency, and a magnetic force sorting machine using the same.

[0004]

According to the present invention, there is provided a magnetic roller according to the present invention, which is disposed with a predetermined gap in an axial direction of a rotating shaft, and each magnetic pole is oriented in an axial direction of the rotating shaft. A plurality of ring-shaped permanent magnets, and a magnetic induction disk made of a ferromagnetic material that is arranged in each of the gaps and that is the same as the outer diameter of the permanent magnet or is slightly larger than the outer diameter of the permanent magnet. , And the magnetic poles of the permanent magnet facing each other via the magnetic induction disk have the same polarity. Here, a steel plate made of a generally used ferromagnetic material can be used for the magnetic induction disk. In addition, in order to further increase the magnetic flux density, the iron loss value,
Silicon steel sheet with excellent magnetic properties such as magnetic flux density and magnetic permeability,
It is also possible to use a low carbon steel sheet and an electromagnetic steel sheet made of pure iron or the like. The thickness of the magnetic induction disk is, for example, 1-2.
It can be 0 mm. The slight range here may be any range as long as the magnetic flux density at the outer peripheral end of the magnetic induction disk is within a range in which a weak magnetic substance can be magnetically attached, and the magnetic force of the permanent magnet to be used and the thickness of the magnetic induction disk are reduced. Determined in consideration of, for example,
It can be set to 10 mm or less. Since the magnetic poles of the permanent magnets have the same polarity as the magnetic poles of the adjacent permanent magnets, the magnetic forces generated by the magnets on both sides can be combined and strengthened, and a magnetic induction disk is inserted in the gap between the adjacent permanent magnets. Since it is arranged, the lines of magnetic force passing through the magnetic induction disk can be guided to the outer peripheral surface of the magnetic roller, and the magnetic field generated radially outward from the outer peripheral surface of the magnetic induction disk can be increased.

[0005] Here, the ring-shaped permanent magnet is fixed to the magnetic induction disk by connecting a large number of arc-shaped magnets, and the outer periphery of the permanent magnet is radially outside the magnetic induction disk. It is preferable to attach an annular protective cover made of a non-magnetic material and provided according to the diameter. Since the arc-shaped magnet is connected, the handling can be simplified and the permanent magnet can be prevented from being damaged. As the protective cover, for example, a thin stainless steel plate can be used, and each protective cover can be integrally formed and used in common. By providing the protective cover, it is possible to prevent the magnetic powder from adhering to the permanent magnet.

In addition to connecting the magnetic induction disks in the axial direction by the rotation shaft, the magnetic induction disks are connected by a plurality of connection screws penetrating through the magnetic induction disks inside the permanent magnet in the radial direction. Is also possible. As the connection screw, a long screw that penetrates all the magnetic induction disks may be used, and a large number of short connection screws are used to fix two to four magnetic induction disks respectively. You may comprise. With this configuration, it is possible to securely mount the plurality of magnetic induction disks and the permanent magnets against the repulsive force of each permanent magnet. According to the present invention, there is provided a magnetic separator according to the present invention, in which a plurality of ring-shaped permanent magnets are arranged with a predetermined gap in an axial direction of a rotating shaft, and each magnetic pole is oriented in an axial direction of the rotating shaft. And a magnetic induction disk made of a ferromagnetic material that is arranged in each of the gaps and that is the same as the outer diameter of the permanent magnet or is slightly larger than the outer diameter of the permanent magnet. The magnetic poles of the permanent magnets facing each other via the disk are magnetic rollers having the same polarity, a thin magnetic article conveying belt connecting the magnetic roller and a driven vehicle, and a drive source for rotating the magnetic roller. To sort out weak magnetic substances.

[0007] The magnetized article transport belt may be made of a non-magnetic, flexible sheet or mesh, such as metals such as stainless steel, titanium and copper, as well as artificial leather, natural leather, plastic and cloth. Can be used. Here, “thin” refers to, for example, a range of 0.1 mm or more and 1 mm or less, and preferably a range of 0.3 mm or more and 0.6 mm or less. By actuating the drive source, the driven vehicle and the magnetic roller connected via the magnetically attached article conveying belt rotate. Since the permanent magnets of the magnetic roller have magnetic poles of the same polarity facing each other across the magnetic induction disk, the magnetic field generated from the magnetic induction disk to the outside of the magnetic roller in the radial direction is strengthened, and the magnetic poles are transferred through the magnetically attached belt. The weak magnetic substance contained in the raw material to be fed into the furnace can be separated and separated from the non-magnetic substance. In addition, since the magnetic roller is attached with a thin magnetic material transport belt, the strength of the magnetic field generated by the magnetic roller can be used efficiently, and the surface of the magnetic roller slides with the raw material. Wear can be prevented. Further, the magnetically attached material conveying belt may be constituted by a stainless steel band plate or a mesh plate. With this configuration,
It is possible to manufacture a device that is thin and has high sorting efficiency, and that has excellent durability.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. As shown in FIGS. 1 and 2, a magnetic separator 10 according to an embodiment of the present invention has a predetermined gap along the axial direction of a rotating shaft 14 supported at both ends by bearings 36, and alternates. A plurality of ring-shaped permanent magnets 19 and 20 arranged in each of the above, and a ferromagnetic material arranged in each of the gaps and having a size slightly larger than the outer diameter of the permanent magnets 19 and 20;
For example, a magnetic roller 11 having a magnetic induction disk 15 made of a steel plate, a magnetically conveyed belt 12 having a small thickness for connecting the magnetic roller 11 and a driven vehicle (not shown), a deceleration motor for rotating the magnetic roller 11, and the like. And a device for selecting a weak magnetic material such as austenitic stainless steel or hematite partially transformed into a magnetic substance.

First, the structure of the magnetic roller 11 will be described in detail with reference to FIGS. The magnetic roller 11 has fixed disks 13 attached to both ends of the rotating shaft 14 in the axial direction, and a plurality of ring-shaped permanent magnets 19 and 20 are alternately provided between the fixed disks 13 so that adjacent permanent magnets are provided. The magnetic induction disk 15 is sandwiched between 19 and 20. Here, the structure of the magnetic induction disk 15 will be described in detail. The magnetic induction disk 15 has a rotating shaft 14 at the center.
Is formed, and a keyway 47 is formed in a part of the inner periphery thereof.

A notch 25 is formed over the entire circumference at the outer peripheral ends on both axial sides of the magnetic induction disk 15. On the radially inner side of the magnetic induction disk 15, fixing holes 23 through which the connecting screws 22 are inserted are equally formed at eight places. Note that the notch 25 is also formed at the outer peripheral end of the fixed disk 13 on the opposite side. next,
The structure of the permanent magnets 19 and 20 will be described in detail. The permanent magnets 19 and 20 are members of the same shape formed by connecting a large number of arc-shaped magnets 28 and fixed to the magnetic induction disk 15. The direction of the magnetic poles of the permanent magnets 19 and 20 is The magnetic poles of the permanent magnets 19 and 20 formed in the axial direction and facing each other via the magnetic induction disk 15 are:
It is configured to have the same polarity. Further, the permanent magnets 19 and 20 are arranged such that their axes are aligned with the magnetic induction disk 15 and the rotating shaft 14.
And one surface in the axial direction is fixed to the fixed disk 13 or the magnetic induction disk 15.

The radius of the annular permanent magnet 19 is smaller than the radius of the magnetic induction disk 15 by the radial width d of the notch 25. The permanent magnet 19 is magnetized so that the right side is an N pole and the left side is an S pole in FIG. In this embodiment, as shown in FIGS. 2 and 3, the permanent magnet 19 is formed by stacking two arc-shaped magnets 28 divided into 16 in the circumferential direction in the axial direction. It can be changed depending on the capacity of the press for forming the magnet and the working cost. For example, the magnet may be divided into eight parts, four parts, or not divided. The permanent magnet 20 is formed by a plurality of arc-shaped magnets 28 similarly to the permanent magnet 19, and the direction of the magnetic pole is opposed to the permanent magnet 19, and the opposite side to the permanent magnet 19 across the magnetic induction disk 15. Are located in Since the permanent magnets 19 and 20 have magnetic poles (N-pole or S-pole) of the same polarity facing each other via the magnetic induction disk 15, the facing magnetic poles repel each other and the magnetic roller The magnetic lines of force directed in the circumferential direction of the
1 can be bent radially outward. Also, since the magnetic forces of the permanent magnets 19 and 20 are combined, the magnetic induction disk 1
The magnetic force generated on the outer side in the radial direction can be increased. Further, since the outer peripheral end of the magnetic induction disk 15 provided between the permanent magnets 19 and 20 protrudes radially outward from the outer periphery of the permanent magnets 19 and 20, the lines of magnetic force passing through the magnetic induction disk 15 are reduced. By guiding to the outer peripheral surface of the magnetic roller 11, the rising direction of the line of magnetic force from the outer peripheral surface of the magnetic roller 11 can be made closer to the perpendicular to the outer peripheral surface of the magnetic roller 11. With this configuration, the magnetic flux density in the direction perpendicular to the outer peripheral surface of the magnetic roller 11 can be further increased, and the weak magnetic material to be sorted can be efficiently magnetized.

Next, the annular protective cover 27 provided on the outer periphery of the permanent magnets 19 and 20 in the radial direction will be described. The protective cover 27 is made of a non-magnetic material, for example, a stainless steel plate, and is formed according to the outer diameter of the magnetic induction disk 15. The protective cover 27 is provided with the permanent magnets 19 and 20.
Are mounted radially outward of the outer circumference of the
, The notch 25 of the magnetic induction disk 15, and the cylindrical space 30 surrounded by the magnetically conveyed material transport belt 12 to prevent the magnetic powder from directly adhering to the permanent magnets 19 and 20. ing. The protective cover 27 maintains a constant distance between the outer peripheral surface of the magnetic induction disk 15 and the outer peripheral surfaces of the permanent magnets 19 and 20 to adjust the distribution of the magnetic flux density on the outer peripheral surface of the magnetic roller 11.

Next, the permanent magnets 19 and 20, the protective cover 2
7 and the arrangement and connection of the magnetic induction disk 15 will be described. The permanent magnets 19 and 20 are fixed to one side surface of each of the magnetic induction disks 15 so as to have their respective axes aligned. A protective cover 27 is attached to the outside of each of the permanent magnets 19 and 20 in the radial direction. A key groove 34 is formed in the center of the rotating shaft 14, and the magnetic induction disk 15 to which the permanent magnets 19 and 20 and the protective cover 27 are attached is connected to the key groove 34 and the magnetic induction disk 15 of the rotation shaft 14. In addition to being connected in the axial direction by a key 35 fitted in the key groove 47, there are also eight pieces that penetrate through the fixing holes 23 formed in the magnetic induction disk 15 and are radially inside the permanent magnets 19 and 20. Connection screw 2
2 are connected to each other by a nut 26 which meshes with the connection screw 22 and fastens and fixes the magnetic induction disk 15. One of the nuts 26 for fixing the magnetic induction disk 15 is
It is also possible to abbreviate and assemble. Further, it is also possible to reduce the length of the connection screw 22 so as to fix the magnetic induction disks 15 one by one.

Next, the magnetic separator 10 using the magnetic roller 11 will be described. A key groove 37 is formed at one extended end of the rotating shaft 14 of the magnetic roller 11, and the rotating shaft 14 is provided with a V belt and a V pulley (not shown) mounted at one end of the rotating shaft 14 or a shaft coupling. To the drive source. The magnetically conveyed material transport belt 12 that connects the magnetic roller 11 and the driven vehicle is made of, for example, stainless steel, which is an example of a non-magnetically adhering metal, and has a thickness of 0.1 mm or more and 1 mm or less, preferably 0.3 mm or more. A strip or mesh plate of 6 mm or less can be used. Generally, the magnetic force is inversely proportional to the square of the distance from the magnet.
The magnetic field generated by the magnetic roller 11 can be effectively utilized by reducing the thickness of the magnetic roller 11. Next, a state when the magnetic force sorter 10 is used will be described with reference to FIG. When the magnetic roller 11 is driven by the driving source,
The driven vehicle connected by the magnetic article transport belt 12 also rotates.

When the raw material to be sorted is thrown in from above the magnetic material transport belt 12, the raw material moves toward the magnetic roller 11, and the magnetic material containing the weak magnetic substance in the raw material is removed from each permanent magnet of the magnetic roller 11. Due to the magnetic forces of 19 and 20, the magnetically attracted material is attracted to the surface of the conveyor belt 12. When the magnetic roller 11 rotates 90 degrees in a state where the magnetic substance is sucked, the non-magnetic substance in the raw material falls downward (arrow A in the figure) due to gravity. Further, when the magnetic roller 11 rotates by 90 degrees, the magnetic roller 11 and the magnetically attached material conveying belt 12 are separated from each other. Is dropped in the lower right direction (arrow B in the figure) by the circumferential force due to the rotation of.

In the prior art, the weak magnetic material was dropped in the direction of arrow A together with the non-magnetic material because the attraction force of the magnetic roller 11 was small. However, by using the magnetic roller 11 according to the present invention, the magnetic field can be reduced. Can be strengthened, so that it can be dropped and dropped in the direction of arrow B as a magnetically attached material. Next, a magnetic separator 38 according to a modification using the magnetic roller 11 according to the present invention will be described with reference to FIG. The magnetic force sorter 38 includes a magnetic roller 11 as described above, a magnetic substance transport plate 39 disposed with a gap around the magnetic roller 11, and a magnetic guide member 40 provided to face the magnetic substance transport plate 39. And A drop guide plate 41 is formed on the upper part of the magnetic substance transport plate 39, and a magnetic separation plate 42 for separating the magnetic substance 46 from the magnetic flux of the permanent magnets 19 and 20 is formed below the lower part.

On the side of the magnetic substance transport plate 39, there is formed a rectangular cylindrical magnetic force selecting section 43 including the magnetic substance transport plate 39 and the magnetic guide member 40. A separating plate 44 whose inclination angle can be adjusted is provided below the magnetic separation unit 43, and the non-magnetic attachment 45 falling downward from the magnetic separation unit 43 and the magnetic separation plate 42 are attracted by the magnetic roller 11 along the magnetic separation plate 42. To be separated into the magnetic attachments 46 falling to the lower right. that's all,
Although the embodiment according to the present invention has been described, the present invention is not limited to the embodiment. For example, the magnetic roller 11 is fixed with eight connecting screws 22. 6 or 4 depending on the strength of the permanent magnet
The number may be reduced to nine, or may be increased to nine or ten. Also, the rotating shaft is changed to a fixed shaft, and both fixed disks 1
3, and each magnetic induction disk 15 can be provided rotatably with respect to a fixed axis. Further, the drive source is configured to drive the magnetic roller, but may drive a driven vehicle. Further, the outer diameter of the magnetic induction disk is set to the permanent magnet 19,
0 and the outer circumference of the magnetic roller is 1
It is also possible to cover with one protective cover.

[0018]

[Embodiment] As shown in FIG.
0-350mm, inner diameter 150-200mm, thickness 25-
An arc-shaped magnet magnetized on the N and S poles on both sides in the axial direction of a magnet piece formed by dividing a 35 mm annular Nd magnet into 16 pieces was used as a prototype.

[0019]

[Table 1]

The positions (1), (2) and (3) in Table 1 are, as shown in FIG. 5B, 2 mm radially inward from the outer periphery of the arc-shaped magnet and 25 to 100 mm radially. , Represents a position 2 mm radially outward from the inner circumference,
B and C indicate a position of 2 mm inward in the circumferential direction from the left end and a center position, and a position of 2 mm inward in the circumferential direction from the right end of the arc-shaped magnet that is erected. The unit of the numerical values shown in Tables 1 and 2 is Gauss (G). As shown in Table 1, the magnetic flux density of the arc-shaped magnet has a maximum value of 4680 G at the position (2) -A.

Next, as shown in FIG. 6, five arc-shaped magnets are arranged so that the magnetic poles of the adjacent arc-shaped magnets face each other, and both ends of the arranged arc-shaped magnets are arranged between each arc-shaped magnet. A test device having a 9 mm-thick magnetic induction plate interposed therebetween was manufactured. The protrusion distance of the magnetic guide plate from the upper end of the arc-shaped magnet was set to 3 mm. The magnetic flux density was measured at every 10 mm in a direction (upward in FIG. 6) away from the magnet from the left and right corners of the upper end of each magnetic induction plate.

[0022]

[Table 2]

As shown in FIG. 6 and Table 2, A to E denote distances from the magnetic induction plate of 0 mm, 10 mm, and 2 mm, respectively.
0 mm, 30 mm, and 40 mm are indicated, and (1) to
(12) is a diagram in which the upper corners of each of the twelve magnetic guide plates are numbered sequentially from the left. For example, C- (4) in Table 2 indicates the magnetic flux density (1110G) measured at a position 20 mm above the right corner of the second magnetic induction plate from the left. As shown in Table 2, the maximum magnetic flux density in this case was 11330G of A- (9). Further, when the thickness of the magnetic induction plate was measured to be smaller than 9 mm, it was confirmed that the magnetic flux density was increased. However, when the thickness of the magnetic induction plate was made smaller than a certain thickness, the magnetic flux density was increased, but the force for attracting the magnetically attached material was reduced. It is considered that this is because the area of the magnetic induction plate that comes into contact with the magnetic substance becomes smaller in proportion to the thickness of the magnetic induction plate.

[0024]

[Table 3]

Next, so as to have the same configuration as the magnetic roller 11 shown in FIG. 1, the thickness of the arc-shaped magnet is set to half that of the arc-shaped magnet used in the test apparatus (see FIG. 6), and the magnets are connected in a ring shape. In addition, the magnetic flux density of a magnetic roller which was used as a permanent magnet in two stages was measured as an example. Hereinafter, description will be made with reference to FIG. The thickness of the magnetic induction disk is 7 mm. Locations (1) and (14) shown in Table 3 are the outer peripheral ends of the left and right fixed disks of the magnetic roller, respectively (2) to
(13) shows the outer peripheral end of the magnetic induction disk provided in order from left to right. As shown in Table 3, in the present embodiment, the maximum value 14420 at the location (2) on the magnetic induction disk.
G, and the minimum value 13100G is shown at the location (4). The reason why the magnetic flux density was larger than that of the above-described test apparatus is that, in addition to making the thickness of the magnetic induction disk thinner than the magnetic induction plate, an arc-shaped magnet was connected in an annular shape, so that the magnetic force lines could not escape in the circumferential direction. It is possible that In a comparative example (not shown), a magnetic induction disk was omitted, and a prototype in which a space was formed between permanent magnets having a thickness of about 40 mm was manufactured. However, the maximum magnetic flux density was only 11,200 G. In this way, a permanent magnet having only a magnetic flux density of 5,000 G or less as a single unit is arranged with the magnetic poles facing each other with a gap therebetween, and a magnetic induction disk is sandwiched between the permanent magnets. , About 2.5 times or more of the magnetic flux density could be obtained.

[0026]

In the magnetic roller according to the first to third aspects, the magnetic poles of the permanent magnets have the same polarity as the magnetic poles of the adjacent permanent magnets, so that the magnetic forces generated from the magnets on both sides can be combined and strengthened. Also, since the magnetic induction disk is provided in the gap between the magnets on both sides, the magnetic force lines passing through the magnetic induction disk are guided to the outer peripheral surface of the magnetic roller, and from the outer peripheral surface of the magnetic induction disk The magnetic field generated radially outward can be increased. Particularly, in the magnetic roller according to the second aspect, since the permanent magnet is formed by connecting the arc-shaped magnets, the handling can be simplified and the permanent magnet can be prevented from being damaged. Further, by providing the protective cover, it is possible to prevent the magnetic powder from adhering to the permanent magnet. In the magnetic roller according to the third aspect, since the magnetic induction disks are connected by a rotating shaft in the axial direction and by a plurality of connection screws penetrating the magnetic induction disks, the plurality of magnetic induction disks and the permanent The magnet can be securely mounted against the repulsion of each permanent magnet. In the magnetic separator according to the fourth and fifth aspects, the permanent magnets of the magnetic roller are generated radially outside the magnetic roller from the magnetic induction disk because the magnetic poles of the same polarity face each other across the magnetic induction disk. The weak magnetic material contained in the raw material supplied through the magnetically attached material transfer belt can be separated and separated from the non-magnetic material by strengthening the magnetic field generated. In addition, since the magnetic roller is attached with a thin magnetic material transport belt, the strength of the magnetic field generated by the magnetic roller can be used efficiently, and the surface of the magnetic roller slides with the raw material. Wear can be prevented. And, in the magnetic force sorting machine according to claim 5, since the magnetically attached material transport belt is constituted by a stainless steel band plate or a net-like plate, the thickness of the magnetically attached material transport belt is reduced to improve the sorting efficiency, An apparatus having excellent durability can be manufactured.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a magnetic separator according to an embodiment of the present invention.

FIG. 2 is a front sectional view of the magnetic force sorter.

FIG. 3 is a partially enlarged sectional view of the magnetic force sorter.

FIG. 4 is a front view of a magnetic separator according to a modification of the present invention.

FIGS. 5A and 5B are a front view of a permanent magnet used in an embodiment of the present invention and a front view of an arc-shaped magnet constituting the permanent magnet, respectively.

FIG. 6 is an explanatory view of a test apparatus using the test piece shown in FIG. 5 (B).

[Explanation of symbols]

10: Magnetic force sorter, 11: Magnetic roller, 12: Magnetically attached belt, 13: Fixed disk, 14: Rotating shaft, 15: Magnetic induction disk, 16: Arc-shaped magnet, 19, 20: Permanent magnet,
21: shaft through hole, 22: connecting screw, 23: fixing hole, 2
5: Notch, 26: nut, 27: protective cover, 2
8: arc-shaped magnet, 30: cylindrical space, 34: keyway, 3
5: key, 36: bearing, 37: keyway, 38: magnetic force sorter, 39: magnetic substance transport plate, 40: magnetic induction member, 41:
Drop guide plate, 42: magnetic separation plate, 43: magnetic force sorting unit,
44: separation plate, 45: non-magnetic material, 46: magnetic material, 47:
Keyway

Claims (5)

[Claims] 1. A plurality of ring-shaped permanent magnets which are arranged with a predetermined gap in the axial direction of a rotating shaft and whose magnetic poles are oriented in the axial direction of the rotating shaft, and are arranged in each of the gaps. A magnetic induction disk made of a ferromagnetic material that is the same as the outer diameter of the permanent magnet or is slightly larger than the outer diameter of the permanent magnet, and that faces each other via the magnetic induction disk. A magnetic roller, wherein the magnetic poles of the permanent magnet have the same polarity. 2. The magnetic roller according to claim 1, wherein the ring-shaped permanent magnet is connected to a plurality of arc-shaped magnets and is fixed to the magnetic induction disk, and is disposed radially outward of an outer periphery of the permanent magnet. A magnetic roller provided with an annular protective cover made of a non-magnetic material and provided in accordance with the outer diameter of the magnetic induction disk. 3. The magnetic roller according to claim 1, wherein the magnetic induction disk is connected to the permanent magnet by a rotation shaft in an axial direction, and is located radially inside the permanent magnet. A magnetic roller connected by a plurality of connecting screws penetrating a disk. 4. A plurality of ring-shaped permanent magnets which are arranged with a predetermined gap in the axial direction of the rotating shaft and whose magnetic poles are oriented in the axial direction of the rotating shaft, and are arranged in each of the gaps. A magnetic induction disk made of a ferromagnetic material that is the same as the outer diameter of the permanent magnet or is slightly larger than the outer diameter of the permanent magnet, and that faces each other via the magnetic induction disk. The magnetic pole of the permanent magnet has a magnetic roller of the same polarity, a thin magnetic material conveyance belt connecting the magnetic roller and a driven vehicle, and a drive source for rotating the magnetic roller. A magnetic separator that performs sorting. 5. The magnetic separator according to claim 4, wherein the magnetic substance transport belt is formed of a stainless steel strip or a mesh plate.