JP2001121028A - Magnetism generating drum and magnetic sorter using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetism generating drum capable of generating high magnetic flux density and a magnetic sorter using the same. SOLUTION: A magnetic sorter 10 has first and second fixing discs 15, 16 comprising a magnetic material and arranged in opposed relationship so as to leave a gap 24, first and second annular permanent magnets 19, 20 fixed to the inner surfaces 17, 18 opposed to the first and second fixing discs 15, 16 and the protective cover 27 comprising a non-magnetic material continuously covering the outer peripheral parts of the first and second permanent magnets 19, 20. The first and second permanent magnets 19, 20 have the magnetism generating parts 13 of which the magnetic poles same in polarity are opposed to each other through a gap 29 to generate magnetic fields outside a radius direction, a plurality of magnetism generating drums 11 arranged along the axial direction of a rotary shaft 14, a thin magnetized matter feed belt 12 connecting the magnetism generating drums 11 and follower wheels and a drive source to sort a weak magnetic substance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic generating drum and a magnetic separator using the same, and more particularly, to a magnetic generating drum capable of selecting a weak magnetic substance by strengthening a magnetic field and using the same. Related to the magnetic separator.

[0002]

2. Description of the Related Art Conventionally, a magnetic separation drum has used a magnetic generating drum in which a plurality of permanent magnets are arranged. Magnets used in magnetism generating drums can change the direction and strength of the lines of magnetic force to be formed depending on their arrangement and type, and attempts have been made to improve the sorting efficiency by changing this arrangement. . For example, Japanese Patent Publication No. 57-4
As described in JP-A-3310 and JP-B-62-54547, magnets arranged at predetermined intervals around the drum are made to have the same polarity so that the lines of magnetic force generated from the magnets become substantially perpendicular to the drum. Then, it was trying to raise the sorting efficiency. On the other hand, there is also a method in which a rubber belt is wound around a magnetism generating drum, 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 a magnetic material due to cutting or the like, when sorting this as a magnetic material, a stronger magnetic flux density was required than in the past. There is no means to increase the volume of the permanent magnet used,
This could not be recovered without increasing the weight and the cost involved. 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. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a magnetic generating drum capable of generating a high magnetic flux density and improving the sorting efficiency, and a magnetic force sorting machine using the same.

[0004]

According to the present invention, there is provided a magnetism generating drum having a plurality of magnetism generating portions for generating a magnetic field on the outer side in a radial direction, which are arranged along an axial direction of a rotating shaft. The magnetism generating section includes first and second fixing disks made of a magnetic material and opposed to each other with a gap therebetween, and opposing inner surfaces of the first and second fixing disks. The first and second annular permanent magnets fixed to the first and second permanent magnets continuously cover the outer peripheral portions of the first and second permanent magnets opposed to each other. A protective cover made of a non-magnetic material provided according to the outer diameter, and
The first and second permanent magnets are configured such that magnetic poles of the same polarity face each other with a gap. Here, first,
As the second fixing disk, a magnetic steel sheet made of a silicon steel sheet, a low carbon steel sheet, or pure iron having excellent magnetic properties such as an iron loss value, a magnetic flux density, and a magnetic permeability can be used. Further, a thin stainless steel plate can be used for the protective cover, and the protective cover used for each of the magnetism generating portions can be integrally formed and used in common. Further, the first and second permanent magnets can be formed by being divided in the circumferential direction and / or the axial direction. Since the magnetic poles of the same polarity face each other with a gap, the magnetic field generated from the gap to the outside of the magnetism generating drum in the radial direction can be increased. Further, by providing the protective cover, it is possible to prevent the magnetic powder from adhering to the first and second permanent magnets.

Here, the outer diameters of the first and second permanent magnets are slightly smaller than the diameters of the first and second fixing discs, and the outer radius of the first and second permanent magnets. It is also possible to form a cylindrical space portion on the outer side in the direction, and attach the protective cover to the cylindrical space portion. With this configuration, the protective cover can be reliably brought into contact with the first and second permanent magnets. In addition to connecting the magnetism generating part in the axial direction with the rotation shaft, the magnetism generating part penetrates through the first and second fixing disks inside the first and second permanent magnets in the radial direction. It is also possible to connect with a plurality of connecting screws. In this case, connecting screws penetrating all the first and second fixing disks may be used, and two to four first and second connecting screws may be used using short connecting screws. The fixing disk may be fixed. With this configuration, it is possible to securely mount the plurality of magnetic generating units against the repulsive force of each magnetic generating unit. Further, the first and second fixing discs which are close to or in contact with the adjacent magnetism generating parts are made to have the same polarity by the magnetic induction of the first and second permanent magnets respectively fixed thereto. It is also possible to configure. With this configuration, the magnetic field generated between the first and second fixing disks radially outward of the magnetic generation drum can be increased. Therefore, the magnetic field generated radially outside the magnetic generation drum is generated between the gap between the first and second permanent magnets arranged at a predetermined interval and the gap between the first and second fixing discs that are close to or in contact with each other. Therefore, the pitch of the strong magnetic field generating portion on the surface of the magnetic generating drum can be reduced, and the efficiency of sorting magnetically attached objects can be increased.

According to the present invention, there is provided a magnetic separator according to the present invention, comprising first and second fixing disks made of a magnetic material and opposed to each other with a gap therebetween, and the first and second fixing disks. The annular first and second permanent magnets fixed to opposed inner surfaces of the disk and the outer peripheral portions of the opposed first and second permanent magnets are continuously covered, and the first and second permanent magnets are covered. And a protective cover made of a non-magnetic material provided in accordance with the outer diameter of the second fixing disk. In addition, the first and second permanent magnets face each other with magnetic poles of the same polarity facing each other with a gap. A magnetic generating drum for generating a magnetic field radially outward, a plurality of magnetic generating drums arranged along the axial direction of the rotating shaft, a thin magnetic material transport belt connecting the magnetic generating drum and a driven vehicle, and And a drive source for rotating the magnetic generation drum, and sorts weak magnetic substances. The magnetized article transport belt may be made of a non-magnetic, flexible sheet or mesh, such as metal such as stainless steel, titanium, and copper, as well as artificial leather, natural leather, plastic, and cloth. it can. Here, the term “thin” means a range of 0.1 mm or more and 1 mm or less, 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 magnetism generating drum connected via the magnetized article conveyance belt rotate. Since the first and second permanent magnets of the magnetism generating drum face each other with the magnetic poles of the same polarity facing each other with a gap therebetween, the magnetic field generated from the gap to the outside in the radial direction of the magnetism generation drum is strengthened to convey the magnetically attached material. The weak magnetic substance contained in the raw material fed through the belt can be separated and separated from the non-magnetic substance. In addition, since the magnetized drum is mounted with a thin magnetic material transport belt, the strength of the magnetic field generated by the magnetized drum can be used efficiently, and the surface of the magnetized drum can be used as a raw material. Sliding and abrasion can be prevented. Also, the magnetically attached material transport belt can be constituted by a stainless steel band plate or a mesh plate. With such a configuration, it is possible to manufacture a device having excellent durability while reducing the thickness to improve the sorting efficiency.

[0007]

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 includes a magnetic generator 13 that generates a magnetic field on the outside in the radial direction, and bearings 36 at both ends.
A plurality of magnetism generating drums 11 arranged along the axial direction of the rotating shaft 14 supported by the shaft, a thin magnetic material conveyance belt 12 connecting the magnetism generation drum 11 and a driven vehicle (not shown), and a magnetism generation drum 11 The apparatus has a driving source such as a rotating deceleration motor and the like, and sorts a weak magnetic substance such as austenitic stainless steel or hematite partially transformed into a magnetic substance. Hereinafter, first, the magnetic generation unit 13 of the magnetic generation drum 11 will be described in detail with reference to FIGS.

The magnetism generating section 13 is made of an electromagnetic steel sheet which is an example of a magnetic material, and has first and second fixing disks 15 and 16 which are opposed to each other with a gap 24 therebetween, and first and second fixing disks. Annular first and second permanent magnets 19 and 20 fixed to opposed inner side surfaces 17 and 18 of the fixing disks 15 and 16, and first and second permanent magnets 19 and 20 arranged opposite to each other And a protective cover 27 made of a stainless steel plate, which is an example of a nonmagnetic material, provided so as to continuously cover the outer peripheral portion of the first and second fixing disks 15 and 16 according to the outer diameter of the first and second fixing disks 15 and 16. I have. The first and second fixing disks 15 and 16 are each provided with a rotating shaft 1 at the center.
4 is formed, and a keyway 47 is formed in a part of the inner periphery thereof. In addition, the first and second
A notch 25 is formed over the entire circumference at the outer peripheral end on the inner side (the gap 24 side) of the fixing disks 15 and 16.
Further, fixing holes 23 are formed on the radially inner sides of the first and second fixing discs 15 and 16 at eight locations and are evenly arranged and through which the connecting screws 22 are inserted. Outside the fixing holes 23 (on the side opposite to the gap 24), an enlarged diameter portion 33 into which the nut 26 can be fitted is formed. Further, the first and second fixing disks 31 and 32 located at both ends in the axial direction of the magnetism generating drum 11 are thicker than the first and second fixing disks 15 and 16, respectively. It is formed in a shape in which the enlarged diameter portion 33 is omitted.

The radius of the annular first permanent magnet 19 is
Is smaller than the diameter of the fixing disk 15 by the width d in the radial direction of the notch 25. And the first permanent magnet 1
9 is the inside (the side facing the opposing second permanent magnet 20)
Are magnetized so that the N pole and the side bonded to the first fixing disk 15 become the S pole. In the present embodiment,
As shown in FIG. 2, the first permanent magnet 19 is
Although it is formed by the magnet piece 28 divided into six, this can be changed in relation to the ability of the press for forming the magnet and the working cost. Is also good. Further, it can be formed by being divided in the axial direction. The second permanent magnet 20 is formed by a magnet piece 28 similarly to the first permanent magnet 19, and the direction of the magnetic pole is opposed to the first permanent magnet 19, and the second permanent magnet 20 is attached to the second fixing disk 16. Glued. Since the first and second permanent magnets 19 and 20 are arranged such that magnetic poles (N poles) of the same polarity face each other with a gap 29 of about 2 mm, opposing N poles repel each other, The lines of magnetic force can rise vertically outside the gap 29 in the radial direction. Further, since the magnetic forces of the first and second permanent magnets 19 and 20 are combined, the magnetic field generated in the gap 29 can be increased.

The protective cover 27 is located radially outside the outer periphery of the first and second permanent magnets 19 and 20, and is provided with first and second permanent magnets.
Of the permanent magnets 19 and 20, the notches 25 of the first and second fixing disks 15 and 16,
2 is attached to the cylindrical space 30 surrounded by
The magnetic powder is prevented from adhering to the second permanent magnets 19 and 20. Next, the arrangement and connection of the magnetism generating unit 13 will be described. A key groove 34 is formed at the center of the rotating shaft 14, and each magnetic generating unit 13 is provided with a key groove 3 of the rotating shaft 14.
4 and key grooves 47 of the first and second fixing disks 15 and 16
In addition to being connected in the axial direction by a key 35 fitted into the first and second fixing disks 15, 16, 31 and 32, the first and second fixing disks 15, 16, 31, and 32 pass through first and second fixing , Second
And eight connecting screws 22 radially inward of the permanent magnets 19 and 20, and nuts 2 that mesh with the connecting screws 22 to fasten and fix the first and second fixing disks 15, 16, 31, and 32.
6 are connected. One of the nuts 26 for fixing the first and second fixing disks 15 and 16 is
It is also possible to abbreviate and assemble. Further, the length of the connecting screw 22 is shortened so that the first and second fixing discs 15,
It is also possible to configure so that 16 are fixed one by one.

Next, a description will be given of the magnetic separator 10 using the magnetic drum 11. A key groove 37 is formed at one end of the rotating shaft 14 of the magnetism generating drum 11 which is extended, and the rotating shaft 14 is provided with a V-belt and a V-pulley (not shown) attached to one end of the rotating shaft, or a shaft. It is connected to a drive source via a joint. The magnetized article conveying belt 12 that connects the magnetism generating drum 11 and the driven vehicle is made of, for example, stainless steel, which is an example of a non-magnetically attached metal, and has a thickness of 0.1 mm to 1 mm
Hereafter, preferably, a band plate or a mesh plate having a size of 0.3 mm or more and 0.6 mm or less can be used. In general, the magnetic force is inversely proportional to the square of the distance from the magnet. Therefore, the magnetic field generated by the magnetic generation drum 11 can be used effectively by reducing the thickness of the magnetically attached article conveying belt 12. Next, a state when the magnetic force sorter 10 is used will be described with reference to FIG. When the magnetism generating drum 11 is driven by the drive source, the driven vehicle connected by the magnetically attached article transport belt 12 also rotates.

When the raw material to be sorted is thrown in from above the magnetic substance transport belt 12, the raw material moves in the direction of the magnetic generating drum 11, and the magnetic substance containing the weak magnetic substance in the raw material is removed from each of the magnetic generating drums 11. It is attracted to the surface of the magnetically conveyed material transport belt 12 by the magnetic force of the magnetism generator 13. When the magnetic generating drum 11 rotates 90 degrees in a state where the magnetic substance is sucked, the non-magnetic substance in the raw material is lowered by gravity (arrow A in the figure).
To fall. Further, when the magnetism generating drum 11 rotates by 90 degrees, the magnetism generating drum 11 and the magnetized material conveying belt 12 are separated from each other. Due to the circumferential force generated by the rotation of the magnetism generating drum 11, it falls in the lower right direction (arrow B in the figure).

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 generating drum 11 was small.
By using No. 1, the strength of the magnetic field could be increased, so it was dropped in the direction of arrow B as a magnetic substance,
Can be sorted out. Next, a magnetic separator 38 according to a modification using the magnetic drum 11 according to the present invention will be described with reference to FIG. The magnetic force sorter 38 includes the above-described magnetism generating drum 11, a magnetized article transport plate 39 disposed with a gap around the magnetized drum 11, and a magnetic induction provided opposite the magnetized article transport plate 39. And a member 40. In addition, a drop guide plate 41 is provided above the magnetic substance transport plate 39, and a magnetic separation plate 42 that separates the magnetic substance 46 from the magnetic flux of the first and second permanent magnets 19 and 20 is provided below.
Are formed continuously.

On the side of the magnetic substance transport plate 39, there is formed a rectangular cylindrical magnetic force selector 43 including the magnetic substance transport plate 39 and the magnetic guiding member 40. Below the magnetic force separation unit 43, a separation plate 44 whose tilt angle can be adjusted is provided. The non-magnetic attachment 45 falling downward from the magnetic force separation unit 43 and the magnetic separation plate 42 while being attracted to the magnetism generating drum 11. It can be separated into a magnetic attachment 46 that falls along the lower right. As described above, the embodiments according to the present invention have been described.
The present invention is not limited to the above embodiment,
For example, the magnetism generating drum 11 is fixed with eight connecting screws 22, but may be reduced to six or four depending on the strength of the first and second permanent magnets, or nine, You may increase to ten. In addition, although the magnetic material is used for the first and second fixing disks, a non-magnetic material such as plastic may be used to generate a strong magnetic field between the opposed S poles. Furthermore, it is also possible to change the rotation axis to a fixed axis and to provide the first and second fixing disks rotatably with respect to the fixed axis. The drive source drives the magnetism generating drum, but may drive a driven vehicle. In addition, the proximity of the adjacent magnetism generating unit 13,
Alternatively, the first and second fixing disks 15 and 16 that come into contact with each other may be configured to have the same polarity by the magnetic induction of the first and second permanent magnets 19 and 20 fixed to the respective disks. is there. With this configuration, the first and second
The magnetic field generated radially outside the magnetic generation drum from between the fixing disks can be increased.

[0015]

As shown in FIG. 5, both axial sides of a magnet piece formed by dividing an annular Nd magnet having an outer diameter of about 300 mm, an inner diameter of about 194 mm and a thickness of 20 mm into eight are magnetized to N and S poles, respectively. The permanent magnet was used as a prototype.

[0016]

[Table 1]

The positions (1), (2) and (3) in Table 1 are respectively 3 mm radially inward from the outer circumference of the permanent magnet, 26.5 mm radially outward from the inner circumference, and 3 radially outward from the inner circumference.
mm position. Locations B, D, b, E in Table 1
Indicates the upper end, the left end, the lower end, and the right end of each of the standing permanent magnets, and indicates a joint portion of the divided magnet pieces. Also, locations A and C are two
Similarly, a position 5 mm away and places c and a also indicate positions 25 mm away from b on both the left and right sides. The numerical values in Table 1 are divided into upper and lower stages for each location. The upper stage shows the magnetic flux density in the horizontal direction, and the lower stage shows the magnetic flux density according to the direction of the magnetic force lines. The units of the numerical values shown in Tables 1 to 3 are Gauss (G). As shown in Table 1, the magnetic flux density of the permanent magnet has a maximum value of 5000 G at the point of location C and position (1), and the magnetic flux density in the horizontal direction at the same point is 2900 G. ,
The direction is inclined from the vertical axis to the measurement surface.

[0018]

[Table 2]

The magnetic flux density of the magnetism generating drum according to the present invention using the permanent magnets as the first and second permanent magnets was measured as a first embodiment. FIG. 6 (A),
(B) and the heights shown in Table 2 represent the distance from the position on the circumferential surface of the magnetic drum to the radial outside. The unit is mm. The position (2) represents the center position of one magnet piece of the permanent magnet of the magnetic generation drum, and (1),
(3) is a position 5 mm away from (2) on both sides in the circumferential direction, (1-2) and (2-3) are intermediate positions between (1) and (2), and (2) and (3). ) (The same applies to the second embodiment). The locations a and b shown in Table 2 represent the intermediate positions of the respective gaps between the first and second permanent magnets of the adjacent magnetic generation units, and the location c is the first abutment of each of the adjacent magnetic generation units. , A contact position of the second fixing disk. In addition, the remarks column shows each measurement place, places a and b are described as magnets, and place c is described as an iron core. As shown in Table 2, in the first embodiment, the height is 0 mm, the location a, the location (1-2).
Indicates a magnetic flux density of a maximum value of 9700G. In this way, by arranging the permanent magnets having a maximum magnetic flux density of only 5000 G as a single unit and facing each other with a gap therebetween, it is possible to obtain a magnetic flux density of about 1.8 times or more as compared with the case of the permanent magnet alone. Can be.

[0020]

[Table 3]

FIGS. 7A and 7B show, as a second embodiment, the measurement positions of the magnetic flux density of the magnetism generating drum according to the present invention in which the above-mentioned permanent magnets are used by being superposed in two stages in the axial direction. ing. The locations a, b, and c shown in FIG. 7B and Table 3 are respectively intermediate positions of gaps between the opposed permanent magnets, connection positions of the permanent magnets and the fixing disk, and axial directions of the fixing disk. At an intermediate position. Note that the remarks column shows each measurement location, where the location a is described as a magnet, the location b is described as an iron core (inside), and the location c is described as an iron core (middle). As shown in Table 3, in the second embodiment, the height is 0 m.
m, location a, maximum value of 10380G at position (2-3)
Is shown. In addition, height 1 mm, place a,
Since the magnetic flux density of 8900 G is also shown at the position (2), it is expected that a higher magnetic flux density can be obtained by using a permanent magnet having a large magnetic flux density.

[0022]

The first and second fixing disks are used in the magnetic drum according to the first to fourth aspects, so that the first and second permanent magnets can be firmly fixed. . Further, since the first and second permanent magnets face each other with the magnetic poles of the same polarity facing each other with a gap, the magnetic field generated from the gap to the outside in the radial direction of the magnetism generating drum is strengthened to sort the weak magnetic substance. It can be performed. Further, since the protective cover is provided, it is possible to prevent the magnetic powder from adhering to the first and second permanent magnets. In particular, in the magnetic generating drum according to the second aspect, a cylindrical space formed outside the first and second permanent magnets having outer diameters smaller than the diameters of the first and second fixing disks. Since the protective cover is attached to the portion, the protective cover can be reliably brought into contact with the outside of the first and second permanent magnets, and can be easily attached. In the magnetic generating drum according to the third aspect, since the first and second fixing disks are connected by the plurality of connecting screws, the repulsive force of each magnetic generating unit can be dispersed and the magnetic generating unit can be easily mounted. In the magnetic force sorter according to the fourth aspect, the first and second fixing disks that are adjacent to or adjacent to the adjacent magnetic generators are configured to have the same polarity, so that the first and second magnetic discs are arranged. The magnetic field generated radially outside the magnetic generating drum from between the two fixing disks can be increased, and the magnetic fields generated radially outside the magnetic generating drum are first and second magnetic disks arranged at predetermined intervals. Since the strength between the gap between the two permanent magnets and the first and second fixing disks that come into contact with or close to each other becomes strong, the pitch of the strong magnetic field generating portion on the surface of the magnetic generating drum is reduced, and the magnetically deposited material is selected. Efficiency can be increased. In the magnetic force sorter according to the fifth and sixth aspects, since the magnetic material drum is provided with the magnetically conveyed belt having a small thickness attached thereto, it is possible to efficiently utilize the strength of the magnetic field generated by the magnetic drum. While you can
It is possible to prevent the surface of the magnetic generating drum from sliding and abrading with the raw material. And in the magnetic force sorter according to claim 6, since the magnetically attached material transport belt is formed of 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.

FIG. 5 is a front view of a single permanent magnet used in the embodiment of the present invention.

FIGS. 6A and 6B are explanatory diagrams of measurement positions of the magnetic flux density of the magnetic generating drum according to the first embodiment of the present invention.

FIGS. 7A and 7B are explanatory diagrams of a measurement position of a magnetic flux density of a magnetic generating drum according to a second embodiment of the present invention.

[Explanation of symbols]

10: Magnetic force sorter, 11: Magnetic generating drum, 12: Magnetic substance conveying belt, 13: Magnetic generating unit, 14: Rotating shaft, 1
5: first fixing disk, 16: second fixing disk, 1
7, 18: inner surface, 19: first permanent magnet, 20: second
Permanent magnet, 21: shaft through hole, 22: connecting screw, 23:
Fixing hole, 24: gap, 25: notch, 26: nut, 27: protective cover, 28: magnet piece, 29: gap, 3
0: cylindrical space, 31: first fixing disk, 32: second
Fixing disk, 33: enlarged diameter portion, 34: key groove, 35: key, 36: bearing, 37: key groove, 38: magnetic separator, 3
9: magnetic substance transport plate, 40: magnetic guide member, 41: drop guide plate, 42: magnetic separation plate, 43: magnetic force sorting unit, 44:
Separating plate, 45: non-magnetic material, 46: magnetic material, 47: keyway, 48: fixing hole

Claims (6)

[Claims] 1. A magnetic drum in which a plurality of magnetic generators for generating a magnetic field outside in a radial direction are arranged along an axial direction of a rotating shaft, wherein the magnetic generator is made of a magnetic material and has a gap. A first and a second fixing disk disposed opposite to each other;
The annular first and second permanent magnets fixed to opposed inner surfaces of the first and second fixing disks and the outer peripheral portions of the opposed first and second permanent magnets are continuous. And a protective cover made of a non-magnetic material provided in accordance with the outer diameter of the first and second fixing disks, and the first and second permanent magnets have the same polarity. Wherein the magnetic poles face each other with a gap. 2. The magnetic generating drum according to claim 1, wherein outer diameters of said first and second permanent magnets are slightly smaller than diameters of said first and second fixing disks. Second
A magnet-generating drum, wherein a cylindrical space is formed radially outward of the outer periphery of the permanent magnet, and the protective cover is mounted in the cylindrical space. 3. The magnetic generating drum according to claim 1, wherein the magnetic generating portion is connected to the first and second permanent magnets in a radial direction inside the first and second permanent magnets in addition to being connected in an axial direction by the rotation shaft. A magnetic generating drum, wherein the magnetic generating drum is connected by a plurality of connecting screws penetrating the first and second fixing disks. 4. The magnetic generating drum according to claim 1, wherein the first and second fixing disks that are adjacent to or adjacent to the adjacent magnetic generating portions are respectively provided. A magnetic generating drum, wherein the magnetic poles have the same polarity by magnetic induction of the fixed first and second permanent magnets. 5. A first and a second fixing disk made of a magnetic material and opposed to each other with a gap therebetween, and fixed to opposite inner surfaces of the first and second fixing disks. An annular first and second permanent magnet and an outer peripheral portion of the first and second permanent magnets arranged opposite to each other are continuously covered, and are adapted to the outer diameters of the first and second fixing disks. And the first and second permanent magnets have magnetic poles of the same polarity facing each other with a gap therebetween to generate a magnetic field radially outward. A magnetic generating drum in which a plurality of generating units are arranged along an axial direction of a rotating shaft, a thin magnetic substance conveying belt connecting the magnetic generating drum and a driven vehicle, and a driving source for rotating the magnetic generating drum. Has,
A magnetic separator that sorts weak magnetic substances. 6. The magnetic separator according to claim 5, wherein the magnetically conveyed material conveyor belt is made of a stainless steel strip or mesh plate.