JPH11104514A - Drum type magnetic foreign matter recovering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To recover a very small magnetic foreign matter and a weakly magnetic foreign matter intruding into raw materials at a high recovery rate by arranging a separating plate which has a front end near the front surface of a nonmagnetic drum and extends diagonally downward toward the downstream side in the rotating direction of the nonmagnetic drum from the front end. SOLUTION: A casing 10 is internally provided with the cylindrical nonmagnetic drum 2 consisting of a high manganese steel, etc., so as to rotate counterclockwise around a shaft 1 fixed to a horizontal direction as the axis of rotation. The separating plate 17 for separating the space on a raw material recovering port 14 side and space on a magnetic foreign matter discharge port 15 side is arranged below the nonmagnetic drum 2. The separating plate 17 is constituted movably forward and backward in a diagonal direction toward the downstream side of the rotating direction of the nonmagnetic drum 2 and its front end 17a is made adjustable in its position. As a result, a very small magnetic foreign matter 31 and a weakly magnetic foreign matter 31 intruding into the raw materials may be recovered at a high recovery rate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum type magnetic foreign matter collecting apparatus for separating and collecting magnetic foreign matter mixed in a non-magnetic powdery material.

[0002]

2. Description of the Related Art Conventionally, in this type of drum type magnetic foreign matter collecting apparatus, as shown in FIG. 3, a vertical line passing through the center of rotation of a non-magnetic drum 2 is provided inside a rotatable cylindrical non-magnetic drum 2. A magnet drum 3 on which a permanent magnet 4 extending in the axial direction is arranged is fixedly arranged in a region on the downward portion side of the non-magnetic drum 2, and the non-magnetic drum 2 is rotated while rotating the non-magnetic drum 2. The non-magnetic powdery granular material 30 is dropped from above onto the surface on the downward portion side, and only the magnetic foreign matter 31 mixed in the raw material 30 is magnetically adsorbed on the surface of the non-magnetic drum 2, and The magnetic foreign matter 31 in 30 is separated.
The magnetic foreign matter 31 adsorbed on the surface of the non-magnetic drum 2 is conveyed on the surface of the non-magnetic drum 2 to the most downstream end of the area where the magnet drum 3 is arranged by the rotation of the non-magnetic drum 2. Then, it is sent out from the most downstream end of the magnet drum 3 to a region free from the influence of the magnetic force by the scraper 7 fixed to the surface of the non-magnetic drum 2, dropped from the surface of the non-magnetic drum 2 by its own weight, and is discharged from the magnetic foreign matter discharge port 15. Is discharged from On the other hand, the raw material 30 falls as it is from the surface of the non-magnetic drum 2 and is recovered from the raw material recovery port 14. A brush 19 is disposed below the non-magnetic drum 2 at the most downstream end of the area where the magnet drum 3 is disposed so as to close the gap between the partition member 16 and the non-magnetic drum 2. It is prevented from flowing to the discharge port 15 side.

[0003]

However, in such a conventional drum type magnetic foreign matter collecting apparatus, the powdery material 3
In the case where the magnetic foreign matter 31 mixed in the magnetic material 0 is minute or made of a weak magnetic material, the magnetic foreign matter 31 once adsorbed on the surface of the non-magnetic drum 2 is centrifugally generated by the rotation of the non-magnetic drum 2. Since a phenomenon occurs in which the magnetic foreign matter 31 scatters from the surface of the nonmagnetic drum 2 to the periphery and is mixed again into the raw material 30 on the raw material recovery port 14 side, the separation and recovery rate of the magnetic foreign matter 31 is reduced. Therefore, an object of the present invention is to provide a drum-type magnetic foreign matter recovery apparatus capable of improving the separation and recovery rate of magnetic foreign matter mixed in a non-magnetic powder material.

[0004]

According to the present invention, a cylindrical non-magnetic drum is arranged with its rotation axis directed horizontally, and the inside of the non-magnetic drum and the non-magnetic drum facing downward. The semi-cylindrical magnet drum on which the permanent magnets extending in the axial direction are arranged is fixed and arranged in the area on the side of the section, and the raw material to be sorted is dropped on the surface of the non-magnetic drum from above the downward side, and the raw material to be sorted is In a drum-type magnetic foreign matter collecting apparatus for collecting and collecting magnetic foreign matter mixed therein on the surface of a non-magnetic drum, a damper is provided above a downward portion of the non-magnetic drum to regulate a passing amount of the material to be sorted. A separation plate having a tip near the surface of the non-magnetic drum below the downward portion of the magnetic drum, and extending diagonally downward from the tip toward the downstream side in the rotation direction of the non-magnetic drum. Drum type magnetic difference It is a collection device.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view of a drum type magnetic foreign matter collecting apparatus according to a first embodiment of the present invention. In FIG. 1, a cylindrical non-magnetic drum 2 made of SUS304, high manganese steel, or the like rotates counterclockwise (arrow in the drawing) around a shaft 1 fixed in a horizontal direction inside a housing 10 as a center of rotation. The magnet drum 3 is fixed to the shaft 1 via the arm 6 inside the non-magnetic drum 2 on the lower side (left side in the figure) of the non-magnetic drum 2 with respect to the vertical line passing through the shaft 1. ing. The magnet drum 3 includes a semi-cylindrical yoke 5 made of a magnetic material such as a steel material, and a plurality of permanent magnets 4 magnetized in the normal direction of the magnet drum 3 along the axial direction. . The permanent magnet 4 of the present embodiment uses a Nd-Fe-B-based rare earth magnet (HS-40AH made by Hitachi Metals) to generate a strong magnetic force with a magnetic flux density of 300 to 500 mT on the surface of the non-magnetic drum 2. It is configured to occur. by this,
Even when the magnetic foreign matter 31 is minute or made of a weak magnetic material, it can be adsorbed on the surface of the non-magnetic drum 2.

A hopper 13 for temporarily storing the granular material 30 is disposed on an upper portion of the housing 10.
The raw material 30 charged into the non-magnetic drum 2 by the guide plate 11 and the damper 12 is located near the top of the non-magnetic drum 2 and on the downward side of the non-magnetic drum 2 with respect to the vertical line passing through the shaft 1 from the top. Be guided. The damper 12 is a damper 12
And a non-magnetic drum 2 with a gap 20 therebetween,
The raw material passing amount from the hopper 13 is adjusted by the width of the gap 20. If the width of the gap 20 is set to be large, the throughput of the raw material is increased by increasing the raw material passage amount, but the diffusion region of the raw material 30 is widened, and the magnetic foreign matter 31 in the raw material 30 comes into contact with the surface of the non-magnetic drum 2 or As the chance of approach decreases, the recovery rate of magnetic foreign matter decreases. On the other hand, if the width of the gap 20 is set to be small, the diffusion region of the raw material 30 becomes narrow, and the chance of the magnetic foreign matter 31 approaching the surface of the non-magnetic drum 2 increases, thereby improving the magnetic foreign matter recovery rate. Drops,
In addition, clogging of the raw material easily occurs in the void 20. Therefore, the width of the gap 20 is appropriately determined in consideration of the magnetic force of the permanent magnet 4 of the magnet drum 3, the diameter of the non-magnetic drum 2, the device configuration conditions such as the number of rotations, and the physical properties such as the fluidity of the raw material 30. Is preferred.

The raw material 30, which is a non-magnetic material, is not affected by the magnetic field generated from the magnet drum 3, falls on the surface of the rotating non-magnetic drum 2 and is near the horizontal plane passing through the shaft 1 Is separated from the surface of the non-magnetic drum 2 on the downstream side in the rotation direction of. In the lower part of the housing 10, a raw material recovery port 14 is provided on the downward side of the non-magnetic drum 2 via a partition member 16, and a magnetic foreign matter discharge port 15 is provided on the opposite side. The raw material 30 detached from the surface is discharged from the raw material recovery port 14 to the outside.

On the other hand, the magnetic foreign matter 31 mixed in the raw material 30
While the raw material 30 falls on the surface of the non-magnetic drum 2, it is captured by a magnetic field generated from the magnet drum 3 and is adsorbed on the surface of the non-magnetic drum 2. The magnetic foreign matter 31 adsorbed on the surface of the non-magnetic drum 2 is transported according to the rotation of the non-magnetic drum 2 and reaches the most downstream end of the area where the magnet drum 3 is arranged. At the most downstream end, the magnetic foreign matter 31
Are retained by the magnetic force formed on the downstream side of the magnet drum 3, but the scraper 7 protrudes over the entire length in the axial direction on the surface of the non-magnetic drum 2, and is located downstream of the area where the magnet drum 3 is arranged. The magnetic field on the side is pushed out to the area where it does not work. As a result, the magnetic foreign matter 31 is released from the magnetic field of the magnet drum 3, falls from the surface of the non-magnetic drum 2, and is discharged from the magnetic foreign matter discharge port 15.

In the drum type magnetic foreign matter collecting apparatus of this embodiment, a separating plate 17 for separating a space on the raw material collecting port 14 side and a space on the magnetic foreign matter discharging port 15 side below the non-magnetic drum 2.
Was placed. By arranging the separation plate 17, when the magnetic foreign matter 31 adsorbed on the surface of the non-magnetic drum 2 is minute or made of a weak magnetic material, the magnetic foreign matter 31 is scattered by centrifugal force due to the rotation of the non-magnetic drum 2. Also, since the raw material recovery port 14 side where the raw material 30 is recovered is shielded by the separation plate 17, it is possible to prevent the magnetic foreign matter 31 from re-mixing into the raw material 30 discharged from the raw material recovery port 14. Further, the separation plate 17 is obliquely downward along the surface of the nonmagnetic drum 2 toward the downstream side in the rotation direction of the nonmagnetic drum 2 so that the collected magnetic foreign matter 31 falls to the magnetic foreign matter discharge port 15 side. It is configured to extend.

The leading end 17a of the separating plate 17 is located below the downward portion of the non-magnetic drum 2 and near the surface of the non-magnetic drum 2, and diffuses when the raw material 30 falls from the non-magnetic drum 2. It is configured to avoid the area. This is because when the tip portion 17 a is set in the diffusion region of the raw material 30, the raw material 30 is separated from the magnetic foreign matter discharge port 1 by the separation plate 17.
This is because the material 30 enters the side 5 and the recovery rate of the raw material 30 decreases. The diffusion range of the raw material 30 varies depending on factors such as the particle diameter and fluidity of the raw material 30, and the scattering range of the magnetic foreign matter 31 varies depending on the rotation speed of the nonmagnetic drum 2 and the characteristics of the magnetic foreign matter 31. Tip 17a of plate 17
Is preferably set appropriately in accordance with the characteristics of the raw material 30 and the mixed magnetic foreign matter 31 and the use conditions of the apparatus, in order to improve both the magnetic foreign matter removal rate and the raw material recovery rate. For this purpose, it is preferable that the separation plate 17 be configured to be movable back and forth in the oblique direction (the direction of the arrow in the drawing) toward the downstream side in the rotation direction of the non-magnetic drum 2 so that the position of the tip 17a can be adjusted. .

In the drum type magnetic foreign matter recovery apparatus of the present embodiment, the magnetic foreign matter 31 as the raw material 30 is 0.1% by weight.
An experiment was conducted using the organic polymer mixed with the raw material 20%.
As a result of the evaluation based on the number of mixed magnetic foreign substances 31 having a particle size of 0.5 mm or more contained in 0 g, the magnetic foreign substance removal rate was about 50% without the separation plate 17, but the separation rate was about 50%. 83-87% by arranging plate 17
Could be improved. Also, the raw material recovery rate is 99.
8% or more could be obtained.

FIG. 2 is a sectional view of a drum type magnetic foreign matter collecting apparatus according to a second embodiment of the present invention. In the above-described first embodiment, one damper 12 for adjusting the amount of the raw material passing from the hopper 13 is provided. In the present embodiment, however, the first damper 12 is disposed above the downward portion of the non-magnetic drum.
In addition, the second damper 18 is arranged on the downstream side in the rotation direction.

This is because when the fluidity of the raw material 30 is high,
In the configuration in which only one damper is arranged as in the first embodiment, the gap 2 between the damper 12 and the non-magnetic drum 2 is formed.
0, the raw material 30 drops vigorously and diffuses widely on the downstream side of the gap portion 20, so that the magnetic foreign matter 3 mixed in the raw material 30
1 decreases the probability of contacting or approaching the non-magnetic drum 2. Therefore, the removal rate of the magnetic foreign matter 31 also decreases. On the other hand, by disposing the second damper 18 downstream of the first damper 12 as in the present embodiment, the surface of the non-magnetic drum 2 between the first damper 12 and the second damper 18 is changed. In the gap 22 between the damper 18 and the damper 18 and the non-magnetic drum 2, a contact opportunity with the non-magnetic drum 2 can be provided again. Thus, even when the fluidity of the raw material 30 is high, the probability of contacting or approaching the non-magnetic drum 2 is increased, and the removal rate of the magnetic foreign matter 31 can be improved.

[0014]

As described above, according to the drum-type magnetic foreign matter collecting apparatus of the present invention, the tip portion is provided below the downward portion of the non-magnetic drum and near the surface of the non-magnetic drum. By disposing a separation plate that extends diagonally downward from the non-magnetic drum toward the downstream side in the rotation direction of the non-magnetic drum, it is possible to collect minute magnetic foreign matter and weak magnetic foreign matter mixed in the raw material at a high recovery rate. became. Further, by arranging two dampers, it was possible to achieve a high recovery rate of the magnetic foreign matter even when the fluidity of the raw material was high.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a drum type magnetic foreign matter collecting apparatus according to a first embodiment of the present invention.

FIG. 2 is a schematic sectional view of a drum type magnetic foreign matter collecting apparatus according to a second embodiment of the present invention.

FIG. 3 is a schematic sectional view of a conventional drum type magnetic foreign matter collecting apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Shaft 2 ... Non-magnetic drum 3 ... Magnet drum 4 ... Permanent magnet 5 ... Semi-cylindrical yoke 6 ... Arm 7 ... Scraper 10 ... Housing 11 ... Guide plate 12, 18 ... Damper 13 ... Hopper 14 ... Material recovery port 15 ... Magnetic foreign matter discharge port 16 ... Partition member 17 ... Separating plate 17a ... Separating plate tip 19 ... Brush 20, 22 ... Void 21 ... Non-magnetic drum surface 30 ... Raw material 31 ... Magnetic foreign matter

Claims (3)

[Claims] 1. A permanent magnet having a cylindrical non-magnetic drum disposed with its rotation axis directed horizontally, and a permanent magnet extending in an axial direction in a region inside the non-magnetic drum and on a portion of the non-magnetic drum facing downward in the rotation direction. The semi-cylindrical magnet drum on which is disposed is fixedly arranged, and the material to be sorted is dropped on the surface of the non-magnetic drum from above the downward facing side, and the magnetic foreign matter mixed in the material to be sorted is removed from the non-magnetic material. In the drum-type magnetic foreign matter collecting apparatus for collecting by absorbing on the drum surface, a damper that regulates a passing amount of the sorted material is provided above a lower side of the non-magnetic drum, and a lower side of the non-magnetic drum is provided. A separation plate having a tip end near the surface of the non-magnetic drum and extending diagonally downward from the tip toward the downstream side in the rotation direction of the non-magnetic drum. Drum type Sex foreign matter recovery device. 2. The drum according to claim 1, wherein said damper comprises a first damper disposed upstream of said non-magnetic drum in the rotational direction and a second damper disposed downstream of said non-magnetic drum in the rotational direction. Type magnetic foreign matter collection device. 3. The separation plate is movable in a diagonal direction toward a downstream side in a rotation direction of the non-magnetic drum.
Or the drum-type magnetic foreign matter recovery apparatus according to 2.