JPH09173890A - Drum type metal sorting and recovering apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently recover a fine magnetic metal foreign matter, in an apparatus wherein a magnet drum is set in a cylindrical nonmagnetic drum, by providing the magnet drum with a first magnet having a magnetizing direction almost the same as the tangential direction thereof and a second magnet having a magnetizing direction almost the same as a normal line direction. SOLUTION: In a drum type metal sorting and recovering apparatus separating and recovering a magnetic metal foreign matter, the magnetic member 14 arranged to a magnet drum 2 is formed into an almost gear-like cross-sectional shape to alternately form recessed parts 14a and protruding parts 14b along the circumferential direction of the drum and first magnets 19, 19' having a magnetizing direction almost the same as the tangential direction of the magnet drum 2 are arranged in the recessed parts 14a and second magnets 20, 20' having a magnetizing direction almost the same as the normal line direction of the magnet drum 2 are arranged to the protruding parts 14b. The adjacent first magnets 19, 19' are arranged so that the same magnetic poles are mutually opposed and the second magnets 20, 20' are arranged so that the magnetic pole on the side near to a nonmagnetic drum and the magnetic pole of the contact surface of the adjacent first magnet are the same.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum-type metal sorting / collecting device for separating and collecting magnetic metal foreign substances mixed in powder particles.

[0002]

2. Description of the Related Art A drum type metal sorting and collecting apparatus is used for collecting magnetic metal foreign matters (for example, iron powder) mixed in a powder or granular material. FIG. 4 shows a cross-sectional view of a main part of a conventional drum type metal sorting and collecting apparatus. In FIG. 4, reference numeral 1 denotes a case, in which a cylindrical non-magnetic drum 3 having a substantially semi-cylindrical magnet drum 2 incorporated therein is rotatably arranged. Further, two scrapers 11 are provided on the surface of the non-magnetic drum 3 at symmetrical positions. In the upper part of the case 1, there are provided a hopper 4 for receiving the raw material 5 as a processed material, a guide plate 6 for guiding the raw material 5 downward, and a damper 7 for continuously supplying the raw material 5 in an appropriate amount to the magnet drum 2 side. There is. A partition member 12, a raw material discharge port 9 and a magnetic metal foreign matter discharge port 13 located on both sides of the partition member 12 are provided in the lower portion of the case 1.

FIG. 5 shows the structure of the non-magnetic drum 3 described above. The substantially semi-cylindrical magnetic member 14 is fixed to the shaft 18 via an arm 17. On the outer peripheral surface of the magnetic member 14 formed of a steel material, a permanent magnet 15 is magnetized in the thickness direction so that the non-magnetic drum 3 side has an N pole, and a non-magnetic drum 3 side has an S pole so as to have an S pole. The permanent magnets 16 magnetized in the vertical direction are alternately arranged at equal intervals to form a magnetic circuit via the magnetic member 14. That is, the permanent magnet 1
The magnetic flux a flowing out from the N pole of No. 5 forms a magnetic field on the surface of the non-magnetic drum 3, penetrates the magnetic metal foreign matter 10 to be magnetically adsorbed, and then forms a magnetic circuit returning to the S pole of the permanent magnet 16.

According to the above apparatus, the foreign matter in the raw material is recovered as follows. The main raw material 8 which is a non-magnetic material in the raw material 5 charged from the hopper 4 is free from the influence of the magnetic force generated from the magnet drum 2 and thus falls freely by its own weight and is discharged from the raw material discharge port 9. On the other hand, the magnetic metallic foreign matter 10 mixed in the raw material 5 is adsorbed on the surface of the non-magnetic drum 3 because it is affected by the magnetic force generated from the magnet drum 2. When the non-magnetic drum 3 is rotated in the counterclockwise direction RD, the magnetic metal foreign matter 10 is conveyed to the lower part of the case 1 by the scraper 11 while being adsorbed on the surface of the non-magnetic drum 3. The magnetic metallic foreign matter 10 is released from the influence of the magnetic force generated from the magnet drum 2 when conveyed to the right side of the partition member 12 on the paper surface, falls from the surface of the non-magnetic drum 3, and is discharged from the magnetic metallic foreign matter discharge port 13. Main raw material 8
Separated and recovered from As described above, in the conventional drum type metal sorting and collecting apparatus, the magnetic metal foreign matter 1 mixed in the raw material 5 is used.
0 is adsorbed on the surface of the non-magnetic drum 3 by the magnetic force of the magnetic drum 2 and conveyed by the scraper 11 to sort and recover the main raw material 8.

[0005]

However, in the conventional drum type metal sorting and collecting apparatus, the magnet drum has the magnetic circuit structure as shown in FIG. 5, and the strength of the magnetic force generated from the magnet drum is limited. When the magnetic metal foreign matter to be adsorbed, sorted and collected has a minute shape, there is a problem that the sorting and collection efficiency is significantly reduced.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a drum type metal sorting and collecting apparatus which can collect minute magnetic metal foreign matters efficiently.

[0007]

In order to achieve the above object, in the present invention, a plurality of permanent magnets are provided on the outer peripheral surface inside the raw material supply means and the rotatably installed cylindrical non-magnetic drum. In a drum type metal sorting and collecting apparatus having a magnet drum on which a substantially semi-cylindrical magnetic member is fixedly arranged, a magnetic metal foreign matter discharge port, and a non-magnetic material discharge port, the magnet drum has a substantially gear-shaped outer peripheral portion. A magnetic member having a formed cross-sectional shape, and installed in the outer peripheral recess of the magnetic member,
A first magnet having a magnetization direction substantially the same as the tangential direction of the magnet drum, and a second magnet installed on the outer peripheral projection of the magnetic member and having a magnetization direction substantially the same as the normal direction of the magnet drum. And the first magnet is arranged so that magnetic poles having the same polarity face each other, and the second magnet has magnetic poles on the cylindrical non-magnetic drum side that are in contact with adjacent first magnets. We adopted the technical means that they are arranged so that they have the same polarity as the magnetic poles on the surface.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a quarter sectional view of a non-magnetic drum 3 according to an embodiment of the present invention. In the present invention, the non-magnetic drum 3
Except for the above, the basic structure is the same as that of the conventional example, and the same parts as those of the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, the magnetic member 14 formed in a substantially semi-cylindrical shape has an outer peripheral portion having a substantially gear-shaped cross-sectional shape, and concave portions 14a and convex portions 14b are alternately formed along the circumferential direction. Has been done. In the concave portion 14a of the magnetic member 14, the first magnets 19 and 1 having a magnetization direction substantially the same as the tangential direction of the magnet drum 2 (magnetized along the width direction of the magnet).
9'is installed, and the convex portion 14b of the magnetic member 14 has a second magnet 20 having a magnetization direction substantially the same as the normal direction of the magnet drum 2 (magnetized along the thickness direction of the magnet). ,
20 'is installed. In addition, the adjacent first magnet 1
9 and 19 'are arranged so that magnetic poles having the same polarity face each other. That is, one first magnet 19 has the N pole on the second magnet 20 side, and the other first magnet 19 'also has the N pole on the second magnet 20 side. The second magnet 2
0 and 20 'are arranged so that the magnetic poles on the side closer to the non-magnetic drum 3 have the same polarity as the magnetic poles on the contact surface of the adjacent first magnet. That is, the adjacent first magnets 19, 19
Since the magnetic pole of the contact surface of 'is the S pole, the second magnet 20'
The magnetic pole on the side of the non-magnetic drum 3 is an S pole.

In the present invention, the second drum 20, 20 'is constructed by constructing the magnet drum as shown in FIG.
Since a magnetic circuit is formed by the convex portion of the magnetic member 14 (the magnetic flux lines pass through the convex portion), the effective magnetic path length becomes large, and the magnet operating point becomes high. In addition, since the repulsive force between the second magnets 20 and 20 'and the first magnets 19 and 19' also acts, it is possible to obtain a high magnetic force in combination with the improvement of the magnet operating point.

FIG. 2 shows the magnetic flux density distribution in the circumferential direction on the outer peripheral surface of the non-magnetic drum 3 of the magnetic drum 2 of the present invention.
FIG. 6 shows the magnetic flux density distribution in the circumferential direction on the outer peripheral surface of the non-magnetic drum 3 of the conventional magnet drum 2. The magnet material, dimensions, etc. are the same as in the experimental examples described later. Comparing the present invention with the conventional example, the magnetic flux density of the conventional example is 285 mT.
On the other hand, the magnetic flux density of the present invention is 433 mT, and it can be seen that a high magnetic force which is about 1.5 times that of the prior art can be obtained.

FIG. 3 shows another example of the magnetic drum 2. The magnet drum 2 includes a first magnet 19, 1 on a non-magnetic plate 21.
The magnet unit 24 to which the 9'is adhered and fixed, and the magnet unit 25 to which the second magnets 20 and 20 'are adhered and fixed on the magnetic plate 22 are alternately magnetized by the bolts 23 so as to be arranged alternately along the circumferential direction. The structure fixed to the member 14 is adopted. Since the magnetic drum 2 is assembled by using both adhesive fixing and mechanical fixing, it is possible to mechanically forcibly fix it even if there is a repulsive force due to the magnetic force, which improves the assemblability and reduces the cost for assembling time. It can be reduced.

An apparatus using the magnet drum according to the present invention shown in FIG. 3 and an apparatus adopting the conventional magnet drum shown in FIG. 5 were respectively manufactured, and magnetic metal foreign substances mixed in the raw material were used by these apparatuses. The recovery rate was measured. The configuration of the device is the same as that of the non-magnetic drum, and the main dimensions and materials are as follows. Case height: 750 mm Case width: 475 mm (shaft direction) Case length: 380 mm Case material: SS400 Non-magnetic drum: Outer diameter 300 mm x length 300 mm / SUS3
04 made Magnet drum rotation speed: 37 rpm (50 Hz) Magnet drum magnetic pole number: 9 Magnet material: Nd-Fe-B system rare earth magnet (Hitachi Metals H
S-40AH)

Approximate shape: A resin pellet (5000 cm ³ having an outer diameter of 5 mm and a height of 10 mm) mixed with 1000 g of a spherical ferromagnetic material having an average particle diameter of 0.5 mm was used as a treated product.
Repeated tests were carried out by feeding the treated product from the hopper at the top of the device. Table 1 shows the results.

[0015]

[Table 1]

From Table 1, it can be seen that the device using the conventional magnet drum has an average recovery rate of 89.8%, while the device using the magnet drum according to the present invention has an average recovery rate of 9%.
It is 8.8%. Therefore, it is clear that the apparatus employing the magnet drum according to the present invention can more reliably sort and collect the minute shaped magnetic metal foreign matter mixed in the raw material than the apparatus equipped with the conventional magnet drum.

[0017]

Since the present invention has the above-described structure and operation, it solves the problems of the conventionally known drum type metal sorting and collecting apparatus, and in particular, the minute shaped magnetic metal foreign matter mixed in the raw material is eliminated. It is possible to accurately and reliably sort and collect.

[Brief description of the drawings]

FIG. 1 is a diagram showing a quarter section of a non-magnetic drum of an apparatus according to an embodiment of the present invention.

2 is a circumferential magnetic flux density distribution on the outer peripheral surface of the non-magnetic drum of FIG.

FIG. 3 is a view showing a quarter section of a non-magnetic drum of an apparatus according to another embodiment of the present invention.

FIG. 4 is a cross-sectional view of a main part of a conventional device.

FIG. 5 is a diagram showing a structure of a conventional non-magnetic drum.

6 is a circumferential magnetic flux density distribution on the outer peripheral surface of the non-magnetic drum of FIG.

[Explanation of symbols]

1 ... Case, 2 ... Magnet drum, 3 ... Non-magnetic drum, 4 ...
Hopper, 5 ... Raw material, 6 ... Guide plate, 7 ... Damper, 8 ...
Main raw material, 9 ... Raw material discharge port, 10 ... Magnetic foreign metal, 11 ...
Scraper, 12 ... Partition member, 13 ... Magnetic metal foreign matter discharge port, 14 ... Magnetic member, 14a ... Recessed portion, 14b ... Convex portion, 1
5, 16 ... Permanent magnet, 17 ... Arm, 18 ... Shaft,
19, 19 '... First magnet, 20, 20' ... Second magnet, 21 ... Non-magnetic plate, 22 ... Magnetic plate, 23 ... Bolt, 2
4, 25 ... Magnet unit

Claims (2)

[Claims] 1. A material supply means, a magnet drum in which a substantially semi-cylindrical magnetic member having a plurality of permanent magnets on its outer peripheral surface is fixedly arranged inside a rotatably installed cylindrical non-magnetic drum, and a magnetic metal. In a drum-type metal sorting and collecting apparatus having a foreign matter discharge port and a non-magnetic material discharge port, the magnet drum has a magnetic member having a cross-sectional shape in which an outer peripheral portion is formed in a substantially gear shape, and an outer peripheral concave portion of the magnetic member. And a first magnet having a magnetization direction substantially the same as the tangential direction of the magnet drum, and a magnet having a magnetization direction substantially the same as the normal direction of the magnet drum, which is installed on the outer peripheral convex portion of the magnetic member. A second magnet, the first magnet is arranged so that magnetic poles of the same polarity face each other, and the second magnet has a magnetic pole on the cylindrical non-magnetic drum side that is adjacent to the first magnet. It has the same polarity as the magnetic pole of the contact surface of the magnet A drum-type metal sorting and collecting device characterized in that it is arranged in such a manner. 2. A magnet unit having a non-magnetic plate adhered and fixed to an inner peripheral magnetic pole surface of a first magnet, and a magnet unit having a magnetic plate adhered and fixed to an inner peripheral magnetic pole surface of a second magnet. Have,
The drum type metal sorting and collecting apparatus according to claim 1, wherein both magnet units are fixed to the magnetic member alternately and at least mechanically along the circumferential direction.