JPH0549966A - Device for separating non-magnetic metal - Google Patents

Abstract

PURPOSE:To separate and recover without failure even small pieces of non- magnetic metal by decreasing the area of a magnetic pole surface confronting the inner surface of a cylindrical piece of permanent magnet smaller than that of a magnetic pole surface set on a rotary body. CONSTITUTION:A permanent magnet piece (m) is formed with pair of left and right plane side faces (a), (a), a pair of left and right vertical faces (b), (b) extending linearly downward adjacent to the side faces, a top face (c) as a part of the cylindrical shape forming a magnetic surface, a pair of front and rear plane faces (d), (d) vertically extending on the both sides of the top face (c), and a plane base (e). A pair of the side faces (a), (a) are inclined in the directions, the upward extensions intersecting mutually. Therefore, the area of the top face (c) is smaller than that of the base (e). In this way, the large flux density from the outer magnetic pole surface of the permanent magnet piece (m) increases the magnetic induction enough to separate and recover efficiently even though pieces of aluminum on a belt conveyor are small.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a non-magnetic metal separator suitable for use in separating small pieces of aluminum scrap from car scrap, for example.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional aluminum separating belt conveyor device, which is designated by 1 as a whole.
The belt 10 of the aluminum separation belt conveyor 2 is wound around the drive roller 11 at one end and a non-metallic (for example, plastic) cylinder 60 at the other end. The drive roller 11 is driven by the electric motor 14 via the belt 15 at a predetermined rotation speed in the arrow direction. Therefore, the cylindrical body 60, which is a driven roller, rotates in the direction indicated by arrow A at a predetermined rotation speed. The cylindrical body 60 has a built-in rotor 7 concentrically attached with a rare earth permanent magnet m ', and the magnets m'attached at the outer peripheral edge are alternately magnetized so that their polarities are shown in the figure. This is configured so that it is rotated around the rotation shaft 46 by the electric motor 44 via the belt 45 in the arrow B direction at a predetermined rotation speed. Although the tubular body 60 and the rotor 7 are concentric with each other, the tubular body 60 is driven to rotate about an axis separated from the axis 46.
The rotation speed of the rotor 7 is set to be sufficiently higher than the rotation speed of the drive roller 11, that is, the cylindrical body 60.

Waste collecting belt conveyors C, D and E, which are sorted and discharged, are disposed below the cylindrical body 60, and partition walls 23 and 24 are provided between them, and rotate above them. Rollers 25 and 26 are provided.

The conventional example is constructed as described above, but it is assumed that municipal waste is now supplied from above one end of the belt 10. These are present even more densely, but are shown scatteredly in the figure. That is, in the upper traveling portion of the belt 10, for example, the aluminum can h, the iron waste f, and the paper waste g are transferred to the right in the figure, and when they reach the uppermost portion of the cylindrical body 60, the rotor 7 incorporated therein is moved. Due to the high speed rotation, the N pole and the S pole of the permanent magnet m ′ provided on the outer peripheral portion of the permanent magnet m ′ rapidly change the positions of the N pole and the S pole with respect to the belt 10, so that an AC magnetic field is generated. An eddy current is induced in the aluminum debris h, and the aluminum debris h receives a repulsive force due to the magnetic flux due to this eddy current and the magnetic flux of the magnetic poles N and S of the rotor 7 that rotates at a high speed. After drawing c, it is discharged to the belt conveyor C for collecting aluminum scrap h.

Further, the paper waste g freely falls from the belt 10 wound around the cylindrical body 60 without being affected by the magnetic flux of the rotor 7 rotating at a high speed, and passes through the locus of d to recover ordinary dust waste. It is discharged to the belt conveyor D. Next, the iron scraps f are attracted to the belt 10 while being strongly attracted by the magnetic poles of the rotor 7, and the residence time on the belt 10 is the longest, and the iron scraps f are discharged to the iron scrap collecting belt conveyor E through the locus indicated by e. It

As described above, aluminum waste, non-metallic waste such as paper waste, plastic waste, and iron waste are recovered from the municipal waste.

The dust components dropped on the rotary rollers 25, 26 are soon dropped into the belt conveyors C, D due to the rotation of the rotary rollers 25, 26. Therefore, the dust components are not accumulated on the partition walls 23 and 24 for a long time, and the various dust components separated by the aluminum scrap separating belt conveyor 2 are surely respectively given predetermined dust collecting belt conveyors C and D. , E can be introduced.

In the above apparatus, however, there is a case where it is desired to recover a small piece of aluminum from, for example, a car scrap (crushed one). However, such an aluminum piece has a rapidly reduced electromagnetic induction force. Therefore, the recovery rate is significantly reduced.

In addition, there is a case where it is desired to separate and collect small pieces of aluminum in the recovered foundry sand in an aluminum casting casting line. However, aluminum pieces having a grain size of 10 mm or less are almost recovered in the above-mentioned apparatus because of insufficient electromagnetic induction force. The current situation is that it cannot be done.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a non-magnetic metal separating apparatus capable of efficiently recovering small aluminum pieces in car scraps.

[0011]

[Means for Solving the Problems] The above object is to provide a belt wound around a drive roller at one end and a non-metallic cylinder at the other end, and a belt built in the cylinder and alternately arranged at the peripheral edge. A rotating body having a plurality of permanent magnet pieces with different polarities attached to the rotating body, the rotating body being rotated in the same direction at a rotation speed higher than the rotation speed of the cylindrical body, and the other end portion of the belt. In a non-magnetic metal separating device in which a more non-magnetic metal material is ejected in a trajectory different from that of other materials, the non-magnetic metal separating device is arranged such that the magnetic pole surface of the permanent magnet piece facing the inner wall surface of the cylindrical body is the rotating body. The non-magnetic metal separating device is characterized in that it has a shape such that its area is smaller than that of the magnetic pole surface attached thereto.

[0012]

The magnetic flux density from the outer magnetic pole surface of the permanent magnet piece becomes larger than the conventional one, and even if the aluminum piece on the belt is small, the electromagnetic induction force becomes large, and efficient separation and recovery can be achieved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An aluminum separator according to an embodiment of the present invention will be described below with reference to FIGS. The parts corresponding to those in FIG. 4 of the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted. It is assumed that the parts not shown are the same as those in FIG.

That is, according to this embodiment, the permanent magnet pieces m having the shape shown in FIG. 2 are attached to the outer peripheral surface of the rotor 7 at equal angular intervals.

The detailed shape of the permanent magnet piece m according to the present invention is shown in FIG. A pair of left and right flat side parts a, a pair of left and right vertical flat parts b, b connected to the flat side parts a and extending linearly downward, and an upper surface having a shape as a part of a cylindrical shape forming a magnetic pole surface. It comprises a part c, flat front and rear surface parts d, d extending vertically on both sides, and a flat lower surface part e. As is apparent from FIG. 2, since the pair of side surface portions a, a are inclined in the direction intersecting upward, the lower surface portion e
The area of the upper surface portion c is smaller than the area of. Further, the lower surface portion e is inserted into the groove g in FIG. 1, the height of the vertical plane portion b is substantially equal to the depth of the groove g, and the vertical plane portion b and the front and rear surface portions d which are flush with the vertical plane portion b are located below. And lower surface e
Are fixed to the groove g by an adhesive.

Since the permanent magnet piece m has the shape shown in FIG. 2, the total amount of magnetic flux flowing out from the magnetic pole surface is the same as the conventional one, but the area of the upper surface portion c as the magnetic pole surface is smaller than the conventional one. , The magnetic flux density becomes high. Further, as shown in FIGS. 1 and 5, the distance S between the permanent magnets m and m in the present invention is larger than the distance S ′ between the permanent magnets m ′ and m ′ shown in FIG. 4 of the conventional example. Therefore, the leakage flux is smaller in the present invention. As described above, the electromagnetic induction force on the small aluminum piece conveyed on the belt 10 is greatly improved as compared with the conventional one. In particular, the electromagnetic induction force is greatly improved because it is proportional to the square of the magnetic flux. Therefore, it is possible to separate a small piece of aluminum, which was impossible in the past. Alternatively, the recovery efficiency is greatly improved.

Although a conventional permanent magnet piece m'is shown in FIG. 6, the pair of left and right flat portions a'are parallel to each other in the vertical direction, unlike the present invention. The area of'is equal to the area of the lower surface part e '. Further, the front and rear surface portions d'are flat and parallel to each other as in the present embodiment. Similar to the present embodiment, such a permanent magnet m'is fitted in the groove g'shown in FIG. 5, and an adhesive is applied to the lower part of the side surface a'and the lower parts of the front and rear surface parts d'to form the groove g '. Fixed to '. Due to such a structure, it has the above-mentioned drawbacks.

Although the respective embodiments of the present invention have been described above, the present invention is not limited to these and various modifications can be made based on the technical idea of the present invention.

For example, in the above embodiment, only the aluminum separating belt conveyor is shown. However, a wind sorter is disposed above the supply end, and the heavy component dust containing aluminum dust in advance and the other components are used. It is also possible to separate the lighter component of dust and waste to further improve the recovery efficiency.

In the above embodiments, aluminum scraps, which account for a large component ratio in car scraps, have been described, but non-magnetic metals can be recovered by the same principle. For example, you can collect brass and copper scrap.

Further, in the above embodiment, the upper surface portion c as the magnetic pole surface of the permanent magnet piece m is shaped so as to form a part of the peripheral surface of the cylinder, but instead of this, this portion is a flat surface, that is, the lower surface. It may be a surface parallel to the portion e.

Further, in the above embodiment, the magnetic pole surface c is formed as a part of the cylindrical shape and also as one surface. However, as shown in FIG. 3, a groove t is formed in this surface parallel to the longitudinal direction. It may be provided and divided into the magnetic pole surfaces c ₁ and c ₂ . The number of divisions may be further increased.

[0023]

As described above, according to the non-magnetic metal separating apparatus of the present invention, even a small piece of non-magnetic metal, for example, aluminum, can be reliably separated and collected.

[Brief description of drawings]

FIG. 1 is an enlarged side view of a main part of an aluminum separation belt conveyor according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a permanent magnet piece in the main part.

FIG. 3 is an enlarged perspective view showing a modified example of a permanent magnet piece.

FIG. 4 is a side view of a conventional aluminum separation belt conveyor.

FIG. 5 is an enlarged side view of the main part.

FIG. 6 is an enlarged cross-sectional view of a permanent magnet piece in the main part.

[Explanation of symbols]

 7 Rotor m Permanent magnet piece

Claims (1)

[Claims] 1. A belt which is wound around a drive roller at one end and a non-metallic cylinder at the other end and is housed in the cylinder.
A rotating body having a plurality of permanent magnet pieces of which the polarities are alternately changed on the peripheral portion, and the rotating body is rotated in the same direction at a rotation speed higher than the rotation speed of the cylindrical body, In a non-magnetic metal separating device in which a non-magnetic metal material is discharged from the other end of the permanent magnet piece in a trajectory different from that of other materials, a magnetic pole surface facing the inner wall surface of the cylindrical body of the permanent magnet piece. Is a shape having an area smaller than that of the magnetic pole surface attached to the rotating body.