JPH0852379A - Drum type magnetic selector - Google Patents

Abstract

PURPOSE:To improve a conventional drum magnetic selecting machine and to improve its magnetic force, and selecting accuracy of magnetic articles by providing a yoke with an arc-shaped crosssection on a part facing to the magnetic pole part of a magnet on the outside of a rotating drum. CONSTITUTION:A magnet 6 is arranged on a part forming a specified circumferential angle on the inside of a rotating drum D by bringing its magnetic pole part 6 close to the inner peripheral face of the rotating drum D and only magnetic articles A among articles to be selected fed from the upper side of the rotating drum D are attracted on the surface of the drum by magnetic force and they are carried by rotation to the terminal end of the magnetic pole part 6a of the magnet 6 and the magnetic articles are separated and fallen by decrease in magnetic force on the part to select only the magnetic articles A from non-magnetic articles B. In this drum magnetic selecting machine, a yoke Y with an arc-shaped crosssection is arranged on a part facing to the magnetic pole part 6 of the magnet 6 on the outside of the rotating drum D. As the result, it is possible to improve the magnetic force, to attract and remove such magnetic articles as iron rust, weak magnetic articles and fine magnetic articles which are hardly removed by means of the conventional magnetic selecting machines and to improve selecting accuracy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for adsorbing and removing only a magnetic substance contained in an object to be sorted introduced from above the rotating drum by the adsorbing action of a magnet arranged inside the rotating drum. It relates to a magnetic separator.

[0002]

2. Description of the Related Art A conventional drum magnetic separator is shown in FIGS. The rotary drum D is provided with side plates 2 at both ends of the drum body 1, and a plurality of scrapers 3 are attached to the outer peripheral surface of the drum body 1 along the circumferential direction at predetermined intervals along the axial direction. The shaft center is horizontal and is rotatably supported by the fixed shaft 5 via the bearing 4. A magnet M is arranged inside the drum body 1 of the rotary drum D. As shown in the figure, the magnet M is composed of an electromagnet in which coils 7 are arranged between a plurality of magnetic pole cores 6 and fixed to the fixed shaft 5, and a case of a permanent magnet. There are cases.
A plurality of magnetic pole cores 6 forming this electromagnet have a substantially semicircular shape, and the rotary drum D is represented by a vertical line passing through the axis of the rotary drum D.
The arc-shaped magnetic pole portion 6a, which is disposed in one of the divided parts, is close to the inner peripheral surface of the drum body 1. When the coils 7 are energized, the magnetic pole portions 6a of the magnetic pole cores 6 have different polarities alternately, and a magnetic field is generated outside the drum body 1 in a space portion facing the magnetic pole portions 6a of the magnetic pole cores 6.

Further, a feeder F for loading the objects to be sorted is disposed above the rotary drum D, and below the feeder F, the sorted non-magnetic material and magnetic material are stored separately. The partition plate 8 is provided.

As described above, in the state where the magnetic field is generated in the space portion opposite to the magnetic pole portion 6a of each magnetic pole core 6 on the outside of the rotary drum D, the feeder F selects the material to be sorted from above the rotary drum D. When the substance is dropped and thrown in, the magnetic substance A contained therein is attracted to the surface of the drum body 1 by the magnetic force and conveyed toward the end of the magnetic pole portion 6a by the rotation of the drum body 1, but the non-magnetic substance B. Drops without being adsorbed on the surface of the drum body 1. When the magnetic substance A adsorbed on the surface of the drum body 1 reaches the end of the magnetic pole portion 6a due to the rotation of the rotary drum D, the magnetic force is weakened and the adsorbing force is reduced. A part of A falls due to its own weight, and the magnetic substance A that does not fall and stays at the end of the magnetic pole portion 6a as it is due to the magnetic force is forcibly forced by the action of the scraper 3 attached to the drum body 1. Part 6
It is moved in a direction away from a, falls, and is accommodated in a portion different from the nonmagnetic material B. As a result, only the magnetic substance A contained in the object to be sorted is removed.

In the drum magnetic separator having the above structure, the magnet M
When the magnet is composed of an electromagnet, the magnetic force on the surface of the drum body 1 is 1,000 to 2,000 G, and when the magnet M is composed of a permanent magnet, the magnetic force is 800 to 1,500 G.
With a magnetic drum sorter having such a magnetic force, ordinary magnetic materials such as ferromagnetic iron pieces can be easily removed, but iron rust, weak magnetic materials, and minute magnetic materials with non-magnetic materials attached can be removed by adsorption. It is difficult, and a stronger magnetic force is required to adsorb and remove them from a non-magnetic substance by magnetic force. In particular, in order to remove iron rust, fine iron powder, iron oxide powder and the like by magnetic force, a magnetic force of 2,000 to 5,000 G is required. Therefore, these magnetic substances cannot be removed accurately by the drum magnetic separator described above.

In such a case, the high Gaussian magnetic separator shown in FIGS. 10 and 11 is used. This high Gaussian magnetic separator uses a pair of columnar magnets M ′ whose both ends are magnetic poles, and the axes of the pair of magnets M ′ are horizontal with a predetermined interval, and different magnetic poles are relative to each other. The magnets M ′ are arranged so as to face each other, and while the magnets M ′ are rotated in the opposite direction, the objects to be sorted are dropped and inserted between the magnets M ′ from above, so that only the magnetic material A from the non-magnetic material is dropped. It is to be removed by adsorption. That is, between the different magnets M ′, a magnetic flux from the N pole to the S pole is generated in the magnetic pole portion thereof, and in each magnet M ′, a magnetic flux from the N pole to the S pole is generated. A strong magnetic field is generated between the magnets M ′ over the entire axial length. As a result, each magnet M '
The non-magnetic material B among the objects to be sorted that has been introduced from above falls directly through the gaps between the magnets M ′, and the magnetic material A is deposited on the surface of the magnetic pole portion of each magnet M ′. The magnet M ′ is rotated while being attracted, scraped off by the scraper 9 fixed immediately below each magnet M ′, and accommodated in a portion different from the nonmagnetic material B.

This High Gauss magnetic separator is 15,000-20,000
Since the high magnetic force of G is generated, the sorting accuracy is high, but the processing amount is small compared to the drum magnetic separator, which is 10 to 50 ton / hour in the drum magnetic separator, and the high Gauss magnetic separator shown in the figure. Then, it is about (0.1 to 2 ton / hour)],
Moreover, there is a drawback that the equipment cost becomes high.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to improve the magnetic force of a conventional drum magnetic separator by improving its magnetic force to enhance the accuracy of selecting magnetic materials.

[0009]

Means for Solving the Problems In order to solve the above-mentioned problems, the means adopted by the present invention is such that a magnetic pole portion is provided at an inner peripheral surface of a rotary drum at a portion forming a specific circumferential angle. A magnet is disposed in close proximity to, and only the magnetic substance among the objects to be sorted, which is fed from above the rotating drum, is attracted to the drum surface by magnetic force, and is rotationally conveyed to the end of the magnetic pole portion of the magnet. In a drum magnetic separator configured to separate and drop the magnetic substance due to a decrease in the magnetic force in the portion to separate only the magnetic substance from the non-magnetic substance, a portion facing the magnetic pole portion of the magnet on the outside of the rotating drum. That is, a yoke having an arcuate cross section is arranged.

[0010]

When a yoke having an arcuate cross section is arranged on the portion of the outer side of the rotary drum facing the magnetic pole portion of the magnet, most of the magnetic flux generated from the magnet has a small magnetic resistance. Since it passes through the inside, the magnetic path length of the space portion is shortened, and the magnetic flux density of the space portion (sorting portion) between the drum body and the yoke is increased. As a result, the magnetic force of the drum magnetic separator is increased, the sorting accuracy of magnetic materials is increased, iron rust, weak magnetic materials,
It is possible to adsorb and remove magnetic substances such as minute magnetic substances, which were difficult to remove by the conventional drum magnetic separator. In particular, when a plurality of slit-shaped discharge holes are provided in the yoke in the lateral direction, the non-magnetic substance that falls between the drum body and the yoke is discharged before reaching the lower end of the yoke. Since it is discharged through the holes, non-magnetic material does not stay between the drum body and the yoke, and the processing capacity as the drum magnetic separator is enhanced.

[0011]

EXAMPLES The present invention will be described in more detail below with reference to examples. The same parts as those described in the above-mentioned "Prior Art" are designated by the same reference numerals, and repeated description will be avoided. Only characteristic parts of the present invention will be described.
FIG. 1 is a cross-sectional view of a drum magnetic separator according to the present invention,
FIG. 2 is a sectional view taken along line XX of FIG. In the present invention, the magnetic pole portion 6 of the magnetic pole core 6 on the outer side of the drum body 1
A yoke Y having an arcuate cross-section is provided at a portion facing a, with a predetermined distance from the outer peripheral surface of the drum body 1. By doing so, as shown in FIG. 3, most of the magnetic flux from the N pole to the S pole of the adjacent magnetic pole portions 6a of the plurality of magnetic pole cores 6 has a remarkably small magnetic resistance as compared with the space portion. Pass the Yoke Y section. As a result, the magnetic path length (δ) of the space portion when the yoke Y is arranged is considerably shorter than that when the yoke Y is not arranged (see FIG. 4), and the drum body 1 And the magnetic flux density of the space portion (selection portion) 11 between the yoke Y and the yoke Y increases. As a result, the magnetic force of the drum magnetic separator can be increased simply by disposing the yoke Y at the above position while keeping the other components of the drum magnetic separator. By arranging this yoke Y, the magnetic force of 1,000 to 2,000 G can be increased to 5,000 G.
It is possible to raise it to a certain degree. The degree of increase in the magnetic force becomes larger as the magnetic path length (δ) is shorter and as the interval (L) between the adjacent magnetic pole portions 6a is longer. This magnetic path length (δ) is different from that of the drum body 1. Since it is necessary to secure a certain distance or more between the yoke Y and the space portion (sorting portion) 11 through which the objects to be sorted flow between them, it is necessary to set the distance to a certain value or more.

Then, by the feeder F, the rotary drum D
When the objects to be sorted are dropped from above, the magnetic substance A contained therein is attracted to the surface of the drum body 1 by the magnetic force and is rotatably conveyed, and the non-magnetic substance B is transferred to the drum body as described above. 1 is not adsorbed on the surface of No. 1 and falls through a space (sorting section) 11 between the drum body 1 and the yoke Y, and is discharged at the end (lower end) of the yoke Y. The magnetic substance A adsorbed on the surface of the drum main body 1 is separated from the surface of the drum main body 1 at the end of the magnetic pole portion 6a and falls, as described in the section "Prior Art". However, since the magnetic force of the magnetic separator is increased, the action of the magnetic substance A adsorbed on the drum body 1 being retained at the end of the magnetic pole portion 6a is increased, so that the surface of the drum body 1 is increased. The rate at which the magnetic substance A adsorbed onto the drum body 1 is forcibly conveyed in a direction away from the magnetic pole portion 6a by the scraper 3 attached to the drum body 1 increases. In this way, since the magnetic force is higher than that of the conventional magnetic separator, the accuracy of sorting magnetic materials is increased, and the conventional magnetic separator such as iron rust, weak magnetic material, and minute magnetic material can be removed by adsorption. It is possible to remove the difficult magnetic material.

As described above, in the present invention, since the yoke Y is arranged at the portion of the magnetic pole core 6 outside the drum body 1 facing the magnetic pole portion 6a, the drum body 1 and the yoke Y are arranged. A space portion (selection portion) 11 between the non-magnetic material B and the nonmagnetic material B serves as a discharge passage for the non-magnetic material B.
May be accumulated, and in order to avoid this, it is necessary to reduce the treatment amount. Therefore, as shown in FIGS. 5 and 6, a large number of slit-shaped discharge holes 12 are provided in the lower half portion of the yoke Y in the lateral direction, and the non-magnetic material passing through the space portion (sorting portion) 11 is nonmagnetic. When a part of the substance B is discharged from the discharge hole 12, the fear of the above-mentioned retention is eliminated and the throughput can be increased.

The magnetic pole core 6 which constitutes the magnetic pole portion 6a of the drum magnetic separator of the above embodiment has a semicircular shape and is fixed to the fixed shaft 5 at a predetermined interval along the axial direction thereof. The magnetic flux is directed in the axial direction of the fixed shaft 5, but in the present invention, as shown in FIG.
The present invention can also be applied to a drum magnetic separator configured to face in the circumferential direction of. In this drum magnetic separator, a magnet mounting plate 14 having an arcuate cross section is attached to a fixed shaft 5 via a pair of semicircular connecting plates 13, and the magnet mounting plate 14 has alternating polarities on its outer peripheral surface. A large number of different rod-shaped permanent magnets 1
5 is fixed along the axial direction of the fixed shaft 5.

[0015]

As described above, according to the present invention, in a drum magnetic separator, a yoke having an arcuate cross-section is arranged at a portion facing the magnetic pole portion of the magnet on the outside of the rotary drum, and most of the magnetic flux generated from the magnet is provided. Since the magnetic path length of the space portion is shortened through the inside of the yoke having a low magnetic resistance, the magnetic flux density of the space portion (selection portion) between the drum body and the yoke is increased, and the magnetic force is increased. . As described above, in the conventional drum magnetic separator, the magnetic force is increased only by arranging the yoke in the above-mentioned portion, and it is difficult to remove iron rust, weak magnetic substances, micro magnetic substances, etc. with the conventional drum magnetic separator. The magnetic substance can be adsorbed and removed, which improves the sorting accuracy of the magnetic separator. Further, if a plurality of slit-shaped discharge holes are provided in the yoke in the lateral direction, the non-magnetic substance that falls through between the drum body and the yoke will be discharged into the discharge hole before reaching the lower end of the yoke. Since the non-magnetic material is not retained between the drum body and the yoke, the processing capacity is improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a drum magnetic separator according to the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a diagram showing directions of magnetic flux in the drum magnetic separator of the present invention.

FIG. 4 is a diagram showing directions of magnetic flux in a conventional drum magnetic separator.

FIG. 5 is a cross-sectional view of another drum magnetic separator according to the present invention.

FIG. 6 is a front view of a yoke Y provided with a discharge hole 12.

FIG. 7 is a sectional view of a drum magnetic separator having a large number of permanent magnets 15 arranged in the axial direction of the fixed shaft 5.

FIG. 8 is a cross-sectional view of a conventional drum magnetic separator.

9 is a cross-sectional view taken along the line X'-X 'of FIG.

FIG. 10 is a perspective view showing the principle of a High Gauss magnetic separator.

FIG. 11 is a front view of the same.

[Explanation of symbols]

 A: Magnetic material B: Non-magnetic material D: Rotating drum M: Magnet Y: Yoke iron 1: Drum body 6: Magnetic pole core 6a: Magnetic pole part of magnetic pole core 12: Discharge hole

Claims (2)

[Claims] 1. A magnet is disposed in a portion forming a specific circumferential angle on the inside of a rotating drum, with a magnetic pole portion being close to an inner peripheral surface of the rotating drum, and the magnet is introduced from above the rotating drum. Among the objects to be sorted, only the magnetic material is attracted to the drum surface by magnetic force, the magnetic material is rotatably conveyed to the end of the magnetic pole portion of the magnet, and the magnetic material is separated and dropped due to the decrease in magnetic force at the portion, and the non-magnetic material In the drum magnetic separator configured to select only the magnetic material from the magnetic drum, a yoke having an arc-shaped cross section is arranged at a portion facing the magnetic pole portion of the magnet on the outside of the rotary drum. . 2. The drum magnetic separator according to claim 1, wherein the yoke is provided with a plurality of slit-shaped discharge holes for discharging non-magnetic substances in a lateral direction.