JP2002273264A - Foreign matter removing device and foreign matter removing mechanism provided with the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a mechanism efficiently removing metallic foreign matters contained in bulk body particles in a glass fiber shape or the like and reducing damage to permanent magnets attracting the metallic foreign matters. SOLUTION: Permanent magnet columns (3) for which a plurality of the permanent magnets. (4) provided with a longitudinal axis (L) and coated with a protective layer (9) on the surface are parallelly arrayed with a prescribed clearance (5) are vertically piled up in multiple stages at a prescribed interval (Dv). When the bulk body particles containing the metallic foreign matters pass through the clearance (5) of the permanent magnets (4) of the respective stages, the metallic foreign matters are attracted to the permanent magnets (4) and removed from the bulk body particles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a mechanism for removing foreign matter mixed in a set (bulk particle group) of glass fiber chopped strands or the like.

[0002]

2. Description of the Related Art Conventionally, magnets have been used to remove foreign substances, particularly metals and their alloys, mixed in bulk particles such as fibers, granules, powders, flakes or pellets. For example, when a bulk particle group is transported by a conveyor or a vibration trough, an installation with a built-in magnet is installed in the middle, and only the metallic foreign matter is adsorbed when the bulk particle group passes through it. It is.

According to the above method,
Although relatively large foreign metal particles on the order of millimeters can be surely removed, fine foreign metal particles on the order of microns cannot be removed and may remain in the bulk particles. Depending on the application of the bulk particle group, there is a case where there is no problem even if a metal foreign matter of a micron order is mixed, but for an application requiring extremely high insulation such as an electronic circuit board, such a bulk particle group is used. Cannot be used. In addition, the above method is suitable for processing a large amount of bulk particles, but due to the configuration of the apparatus, there are rotating bodies and vibrating bodies, so that foreign substances from the surroundings are present on the conveyor belt and trough. There is also a problem that is easily mixed.

The present invention has been completed in order to solve such inconveniences, and reliably removes minute foreign substances contained in a bulk particle group while reducing damage to a permanent magnet which adsorbs foreign substances. An apparatus and a removal mechanism are provided. Still another object of the present invention is to provide a foreign matter removing mechanism in which foreign matters are hardly generated and foreign matters are hardly mixed from the surroundings.

[0004]

According to a first aspect of the present invention, there is provided a foreign matter removing apparatus according to the present invention.
Has a longitudinal axis, a permanent magnet row in which a plurality of permanent magnets, the surfaces of which are covered with a protective layer, are arranged in parallel with a predetermined gap, and has a structure in which a plurality of stages are stacked up and down at a predetermined interval to remove foreign matter. When the contained bulk particles pass through the gaps between the permanent magnets in each stage, foreign substances are adsorbed by the permanent magnets and removed from the bulk particles.

[0005] With the above configuration, by providing a plurality of rows of permanent magnets having one or more predetermined gaps, foreign substances can be removed from the bulk particles passing through the gaps. In addition, by covering the surface of the permanent magnet with the protective layer, it is possible to prevent the permanent magnet from being damaged due to the drop impact of the bulk particles.

According to a second aspect of the present invention, a non-magnetic material row in which a plurality of non-magnetic materials having a longitudinal axis are arranged in parallel with a predetermined gap is further provided at the uppermost stage. In this way, by providing a row of non-magnetic material that is not a permanent magnet at the uppermost stage, the permanent magnet at the uppermost stage is not damaged, and the impact at the uppermost stage where the drop impact of the bulk particles is largest is absorbed. Therefore, damage to the protective layer of the permanent magnet provided in the second and subsequent stages can be further reduced.

In the third aspect, since the material of the non-magnetic material is the same as the material of the protective layer, it is not necessary to reconsider the influence of the abrasion powder of the non-magnetic material on the quality of the bulk particles. Further, since the protective layer is made of an austenitic stainless steel material in the fourth aspect, abrasion debris of the protective layer does not mix into the bulk particles. The austenitic material, particularly SUS304, changes its abraded surface or fractured surface from austenite to martensite and becomes magnetic. Therefore, when an austenitic stainless steel material is used for the protective layer, the wear-peeled pieces are attracted to the permanent magnet, so that the wear-peeled pieces, that is, foreign substances, do not enter the bulk particles.

According to a fifth aspect of the present invention, each of the permanent magnets comprises a plurality of annular permanent magnet pieces disposed around the iron core and in the longitudinal direction of the iron core, and a yoke is provided between the permanent magnet pieces. Was arranged. The reduction of the magnetic flux density of each permanent magnet piece can be prevented by the yoke.

According to the present invention, the bulk particles are formed into a fibrous, granular, powdery, flake, or pellet shape, whereby foreign substances contained in the bulk particles having various shapes can be removed. Further, in claim 7, the bulk particles are formed by chopped strands of glass fibers (hereinafter referred to as “C”).
S ") or glass flakes (hereinafter referred to as" GF ") makes it possible to provide a reinforcing material at a low cost for applications requiring insulation. Note that CS or GF also includes those obtained by granulating them with a binder.

According to claim 8, the diameter of the foreign matter is 1 to 1000.
μm. Thus, even if the bulk particles are used for applications requiring extremely high insulating properties, such as electronic circuit boards, electrical shorts and the like can be reliably prevented.

According to a ninth aspect of the present invention, the permanent magnet array has two to eight permanent magnets, and the permanent magnet array has two to eight stages.
And the magnetic flux density of the permanent magnets is 10000 gauss or more on the surface of the protective layer, the gap between the permanent magnets in the permanent magnet row is 10 to 30 mm, and the interval between the upper and lower steps of the permanent magnet row is 5 to 40 mm. And the thickness of the protective layer was set to 0.2 to 2 mm. As a result, foreign substances having a diameter of 1 to 1000 μm contained in the bulk particles can be almost completely removed. According to the tenth aspect, by setting the magnetic flux density of the permanent magnet to 12000 gauss or more on the surface of the protective layer, foreign substances having a diameter of 1 to 1000 μm can be reliably removed, and foreign substances having a sub-μm diameter can be removed. Become.

In the eleventh aspect, since the gap between the non-magnetic members is the same as that of the permanent magnet row, the drop impact of the bulk particles can be sufficiently absorbed at the uppermost stage.

Further, the first to eleventh aspects of the present invention can be expressed as follows. In the twelfth aspect, a plurality of rod-like bodies each containing a permanent magnet in the protective layer and having a magnetic flux density of 12000 gauss or more on the surface of the protective layer are arranged in parallel, and a bulk particle group is passed between the rod-like bodies. As a result, foreign substances contained in the bulk particles are adsorbed and removed. This makes it possible to reliably remove micro foreign substances of the order of μm contained in the bulk particle group and to remove ultrafine foreign substances of the order of sub μm.

A foreign matter removing mechanism according to a second aspect of the present invention comprises:
In Claim 13, the foreign matter removing device according to any one of Claims 1 to 12, and a first body disposed above the foreign matter removing device and containing a bulk particle group containing foreign matter. A supply device for transporting the container and / or the bulk particle group to the entrance of the foreign matter removing device, and a second container disposed below the foreign material removing device and containing the bulk body particle group are provided. .

Thus, the bulk particles as a raw material containing foreign matter contained in a first container such as a hopper are supplied from the supply device into the foreign matter removing device, and the bulk material from which the foreign matter has been removed by the foreign matter removing device. If the particle group is accommodated in the second container, a foreign substance removing mechanism that can ship the product together with the second container is provided.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the accompanying drawings. 1 to 4 show a first example of a foreign matter removing apparatus according to the first invention, which shows a foreign matter removing apparatus using CS as a bulk particle group, and FIG. 1 shows a plurality of permanent magnet rows superimposed. Internal sectional view showing the state,
2 is a perspective view of the uppermost row of permanent magnets, FIG. 3 is a sectional view taken along the longitudinal axis of the permanent magnet, and FIG. 4 is a sectional view taken along line AA of FIG.

As shown in FIGS. 1 and 2, in the foreign matter removing apparatus 1 of this configuration example, a plurality of permanent magnet rows 3 are vertically stacked at a predetermined interval Dv in a substantially cubic metal casing 2. It has the structure which was done. Each row of permanent magnet rows 3 comprises a plurality of permanent magnets 4 whose surfaces are covered with a protective layer,
These permanent magnets 4 have a longitudinal axis L with a gap 5 having a predetermined width Dh.
Are arranged in parallel along. The permanent magnet rows 3 of each stage are mounted in a frame 6, and the permanent magnet rows 3 of each stage are moved in and out of the metal housing 2 by moving the frame 6 in and out. The frame body 6 includes frame pieces 61a, 61 having substantially equal lengths.
1b, 61c and 61d. Both ends 41 a and 41 b in the longitudinal axis direction of each permanent magnet 4 in each stage are fixed to opposed frame pieces 61 a and 61 b of the frame body 6, respectively. Note that both ends 41a and 41b of each permanent magnet 4 may be rotatably attached to the frame pieces 61a and 61b, respectively. Since each permanent magnet 4 is rotated by the falling contact of the bulk particles, the falling contact portion of the bulk particles extends over the entire surface of the permanent magnet, so that the life of the permanent magnet is extended. Although not shown, an opening / closing door is attached to one side of the metal housing 2. This door,
It is closed during the foreign matter removal processing to prevent foreign matter from entering from the surroundings. Then, after processing a certain amount of the bulk particles, the opening / closing door is opened, and the permanent magnet row is pulled out therefrom. The drawn-out permanent magnet row is cleaned and removed of foreign substances adhering to the surface of the protective layer, and is returned to the housing.
Through this series of operations, the permanent magnet array is repeatedly used until the protective layer is broken.

In the illustrated example, six rows of permanent magnet rows 3 are superposed, and the width Dh of each gap 5 is set to 15 in an odd-numbered row of permanent magnet rows 3.
mm, four permanent magnets 4 are arranged, and in the even-numbered permanent magnet row 3, five permanent magnets 4 are arranged with Dh of each gap 5 being 15 mm. The structure is 32 mm. In order to prevent the gap between the left and right ends of the odd-numbered permanent magnet rows from becoming too large, the housing 2 has a triangular prism 2 having an inclined surface.
1 is attached. Note that each stage is counted sequentially with the top stage as the first stage. The number of stages of the permanent magnet row 3,
The number of permanent magnets 4 in each permanent magnet row 3, the width Dh of the gap 5 between the permanent magnets 4 in each permanent magnet row 3, and
The interval Dv between the upper and lower stages of the permanent magnet array 3 is not limited to this example, and may be appropriately selected according to the particle size and magnetic characteristics of the foreign matter, the processing amount of the bulk particle group, and the like.

In the illustrated example, the widths Dh of the gaps 5 of the permanent magnets 4 in the permanent magnet row 3 are all constant. However, the width Dh of the gaps 5 in each stage is constant and the width Dh of each stage is different. May be set, and the width Dh of the gap 5 in each step may be set to be all different, or the gap 5 in each step may be set.
May be set in several different groups.
Further, in the illustrated example, all the intervals Dv formed by the upper and lower stages of the permanent magnet row 3 are all constant values, but the intervals Dv may all be set to be different, or the intervals Dv may be different. It may be set in groups.

Further, in the illustrated example, the permanent magnets 4 are arranged such that the permanent magnets 4 of the next stage are arranged immediately below the gaps 5 between the permanent magnets 4 in each stage, and such an arrangement is employed. Is preferred. By arranging in this manner, the bulk particles passing through the gaps 5 at each stage fall onto the permanent magnets at the next stage, so that the bulk particles continuously pass through the gaps at each stage without contacting the permanent magnets. Can be prevented, and as a result, foreign matter can be reliably removed. However, it is possible to reduce the unadsorbed foreign matter by increasing the magnetic flux density of the permanent magnets, etc., and the invention is not limited to such a magnet arrangement.

As shown in FIGS. 3 and 4, each permanent magnet 4
Consists of a plurality of annular permanent magnet pieces 42, which are fitted around the iron core 7 along the longitudinal direction via a yoke 8. Note that a permanent magnet structure that does not use the iron core 7 and / or the yoke 8 may be used. The type of the permanent magnet 4 to be used is not particularly limited, and a rare earth magnet, a ferrite magnet, and / or a bond magnet are used, but a rare earth magnet is preferably used.

By contact with the bulk particles, the permanent magnet 4
The surface of the permanent magnet 4 is covered with a protective layer 9 so as to prevent the permanent magnet from being damaged. The material of the protective layer 9 is not particularly limited, and a metal, a plastic, a ceramic, or the like is used from the viewpoint of excellent wear resistance due to contact with the bulk particles. In particular, in the case of austenitic stainless steel, when it is worn and peeled, it changes to a martensite system and becomes magnetic, so that the worn and peeled pieces are attracted to the permanent magnet. As described above, the abrasion debris of the protective layer 9 can also be adsorbed and removed by the permanent magnet together with the foreign matter contained in the bulk body particle group. Therefore, it is preferable to use an austenitic stainless steel material. SUS304 is preferably used.

The protective layer 9 is preferably formed so as to protect the entire periphery of the permanent magnet 4. In the case of a stainless steel material, it is easy to use a pipe-shaped one in terms of coating operation. The protective layer may not be formed on the bottom of the permanent magnet where the bulk particles hardly contact.

As for the thickness of the protective layer 9, it is necessary to reduce the thickness in order to increase the magnetic flux density in the gap 5 between the permanent magnets 4. The wear accelerates the wear of the protective layer. on the other hand,
When the protective layer 9 is thickened, the wear of the protective layer due to the contact wear with the bulk particles is slowed down, but the magnetic flux density in the gap 5 between the permanent magnets 4 cannot be increased. Therefore, it is necessary to determine the thickness of the protective layer 9 so as to obtain the desired performance of removing foreign metal.

Factors affecting the foreign matter removal performance include:
The average passing speed in the vertical direction of the bulk particles containing foreign matter in the device is also included. If this average passage speed is high, the unadsorbed foreign matter increases.

In order to design the foreign matter removal performance, it is necessary to first set the range of the foreign matter diameter to be removed, the removal rate thereof, and the throughput of the bulk particles per unit time. Here, the removal rate is the ratio of the amount of foreign matter having a diameter within a predetermined range contained in the processed bulk body particles to the amount of foreign matter having a diameter within a predetermined range contained in the untreated bulk body particles. Is calculated from

Next, in order to achieve such setting criteria, the width Dh of the gap 5 between the permanent magnets 4, the interval Dv in the upper and lower stages of the permanent magnet row 3, the thickness of the protective layer 9 of the permanent magnet, the bulk particles , The number of permanent magnets 4 provided in the permanent magnet row 3, and the number of stages of the permanent magnet row 3, are determined experimentally.

When CS is used as a reinforcing material for an electronic circuit board, metal foreign substances having a diameter of 1 μm or more should be removed for the purpose of preventing the occurrence of an electrical short due to foreign substances contained in the bulk particles. It is preferable to remove metal foreign matters having a diameter of sub-μm or more.

In order to almost completely remove metallic foreign matter having a diameter of 1 μm or more, the permanent magnet row 3 is provided with 2 to 8 permanent magnets 4 and the permanent magnet row 3 is provided with 2 to 8 steps. Width D of gap 5 between permanent magnets 4 in permanent magnet row 3
h is set to 10 to 30 mm, the magnetic flux density on the surface of the protective layer of the permanent magnet is set to 10,000 gauss or more.
It is preferable that the interval Dv in the upper and lower stages is 5 to 40 mm, and the thickness of the protective layer 9 of the permanent magnet is 0.2 to 2 mm.

Further, when the magnetic flux density on the surface of the protective layer of the permanent magnet is set to 12000 gauss or more, 1 μm
The metal foreign matter having the above diameter can be reliably removed, and the metal foreign matter having a diameter of sub-μm can be removed.

Next, the second foreign matter removing apparatus according to the first invention will be described.
Regarding the configuration example, portions different from the first configuration example will be described with reference to FIG. FIG. 5 is an internal cross-sectional view showing a state in which a plurality of rows of permanent magnets 3 are superposed, and corresponds to FIG. 1 in the first configuration example.

In this configuration example, in the foreign matter removing apparatus of the first configuration example, the non-magnetic material row 11 composed of the non-magnetic material 10 is
The permanent magnet array 3 is further provided at the uppermost stage.

In the foreign matter removing device according to the first configuration example, the permanent magnets 4 arranged in the uppermost permanent magnet row 3 receive the largest drop impact due to the bulk particles. Due to the long-term removal operation, the protective layer 9 may be gradually worn to expose the permanent magnet 4, and the permanent magnet itself may be damaged. If the permanent magnets are damaged, a desired magnetic flux density cannot be obtained in the gaps 5 between the permanent magnets, and as a result, a disadvantage that the set removal rate of foreign substances cannot be achieved may occur. The foreign matter removing device according to this configuration example is made from such a viewpoint, and by arranging the non-magnetic material row at the uppermost stage as a buffer against a large drop impact due to the bulk particles, it is located at a lower stage than this. An object of the present invention is to reduce wear of a protective layer provided on permanent magnets arranged in a row of permanent magnets.

The material of the non-magnetic material 10 is not particularly limited, and it is preferable to use metal, plastic or ceramics, but it is preferable to use the same material as the protective layer 9. If the material is different from that of the protective layer 9, the nonmagnetic material 1
This is because the influence of the abrasion powder of 0 on the quality of the bulk particles must be considered separately from the material of the protective layer 9. From such a viewpoint, austenitic stainless steel is preferable as the material of the non-magnetic material 10, and in particular, S
US 304 is preferred.

The non-magnetic material 10 can have the same shape as the permanent magnet as shown in the illustrated example, but may have a different shape. Also, the nonmagnetic body row 11 in which a plurality of such nonmagnetic bodies 10 are arranged may employ the same arrangement as the permanent magnet row 3 or a different arrangement.
In the illustrated example, the shape of the non-magnetic material 10 is the same as that of the permanent magnet 4, and the arrangement of the non-magnetic material 10 in the non-magnetic material row 11 is also the same as the permanent magnet 4 in the third, fifth and seventh-stage permanent magnet rows 3.
The sequence is the same as In order to further reduce the damage of the protective layer 9 of the permanent magnets 4 arranged in the second and subsequent stages, in order to sufficiently absorb the drop impact of the bulk particles in the non-magnetic material row 11, the gap 12 of the non-magnetic material 10 Width NDh is 3
It is preferably 0 mm or less, preferably 20 mm or less.

Next, an example of a foreign matter removing mechanism according to the second invention of the present invention will be described with reference to FIG. The foreign matter removing mechanism 13 according to the present invention includes a first foreign matter removing apparatus 1 according to the first invention, which accommodates a bulk particle group containing foreign matter.
And a supply device 15 for transporting the bulk particles containing the foreign matter substantially in the horizontal direction from the first container 14 to the entrance of the foreign matter removing device 1 is provided, and the bulk body from which the foreign matter has been removed is provided. The second container 16 for accommodating particles is disposed immediately below the foreign matter removing device 1. In addition, in the present foreign matter removing mechanism, it is not always necessary to provide both the first container 14 and the supply device 15. For example, the first container 14
May be provided, and only the supply device 15 having a portion for accommodating the bulk particle group may be provided. Alternatively, instead of providing the supply device 15, a first supply port provided below for supplying the bulk particle group to the foreign matter removing device 1 is provided.
May be provided. Further, the first container 1
4 and the supply device 15 may be integrated.

As the first container 14, a hopper is usually used. The supply device 15 is not particularly limited as long as it can transport the bulk particle group substantially in the horizontal direction from the first container 14 to the entrance of the foreign matter removing device 1, but it is not limited thereto. Are used.
As the foreign matter removing device 1, the device according to the above-described first or second configuration example can be used. As the second container 16, a packing container as a product shipping form is used. In this way, by installing the foreign matter removing device directly above the second container, the foreign matter can be removed immediately before shipping the product.
Therefore, it is not necessary to use a conveyor or a vibrating trough after the foreign matter is removed, and it is possible to suppress foreign matter from entering the product from the surroundings as much as possible.

[0038]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a wear test of a protective layer when removing a foreign substance contained in CS using the foreign substance removing mechanism according to the present invention will be described below.

(Example 1) The foreign matter removing apparatus 1 according to the first configuration example of the first invention is used for the foreign matter removing mechanism according to the second invention. The specifications of the foreign matter removing device 1 are as follows. The number of permanent magnet rows is 6, the number of permanent magnets arranged in odd-numbered rows is 4, the number of permanent magnets arranged in even-numbered rows is 5, and the permanent magnets are all of the same shape and have an outer shape of 25 m.
m, inner diameter 7mm x length 23cm, its protective layer is SUS3
04, the thickness is 0.5 mm, the width Dh of the gap between the permanent magnets is 14 mm, the magnetic flux density on the surface of the protective layer is 12,000 gauss, and the interval Dv in the upper and lower stages of the row of permanent magnets is 32 mm.
And In addition, the top row of permanent magnet rows and the CS feeder 15
, That is, the height at which the CS falls is 135 mm. CS is obtained by bundling E glass composition filaments having an average diameter of 9 μm by a known means and cutting the filaments to have an average length of 1.5 mm or 3.0 mm. Note that a urethane-based binder was used as the convergence binder.
In addition, the amount of the attached binder was 1.0% by weight in terms of ignition loss. 800 kg / hour of this CS,
Foreign matter removal processing was performed at a rate of 300 tons per month.
In order to confirm whether or not foreign matter was mixed in the CS after the foreign matter removal processing, a CS sampling inspection was performed at a pace of about once / week. This sampling inspection is performed by the inspector
S is appropriately sampled from the second container by several grams, spread on a white inspection table, exposed to intense light, and observed with an optical microscope for diffuse reflection. According to this method, foreign matter (particularly metal foreign matter) on the order of microns can be reliably found. As a result, no foreign substances were found for 12 months. Cleaning of permanent magnet row is 2
I went at the pace of times / day. Twelve months after the start of the foreign matter removal treatment, relatively large scratches were found on a part of the protective layer of the uppermost permanent magnet. If used more than this, there was a risk that the protective layer would be damaged and the permanent magnets would be exposed, so the top row of permanent magnet rows was replaced at this point.
Therefore, the life of the permanent magnet array is about 12 months.

(Embodiment 2) In Embodiment 1, the foreign matter removing device according to the second configuration example is used in the foreign matter removing mechanism according to the second invention, instead of the foreign matter removing device according to the first configuration example. The foreign matter removing device according to the second configuration example has five stainless steel pipes having the same shape as the protective layer of the permanent magnet arranged at the top of the foreign matter removing device according to the first configuration example. The gap between the non-magnetic members was the same as that of the permanent magnet row, and the interval between the uppermost stage and the second stage was the same as the interval between the second stage and the third stage.
Using this foreign matter removing apparatus, CS
Was removed. As a result, 12
Some months later, some of the stainless steel pipes on the top were damaged. Therefore, only the top row of stainless steel pipes was replaced. Thereafter, the foreign matter removal processing of CS is continuously performed. However, even after 24 months have passed, no damage is found on the uppermost row of stainless steel pipes and the second to seventh rows of permanent magnet rows. Note that no foreign matter has been found in the sampling inspection from the start of the process to the present.

The foreign matter removing device and the foreign matter removing mechanism according to the present invention can be used, for example, in a CS used as a reinforcing material for an electronic circuit board.
It is preferably used when removing metallic foreign matter mixed therein, but is not limited to such use.
As the bulk particles, in addition to CS, granules, powders, flakes, or pellets can also be used.

[0042]

According to the first aspect of the present invention, there is provided a foreign matter removing apparatus including a plurality of permanent magnet rows having at least one predetermined gap at predetermined intervals, and bulk particles containing foreign matter are disposed at each stage. When passing through the gap between the particles, only the foreign matter can be removed from the bulk particles by adsorbing to the permanent magnet.
Since the surface of the permanent magnet is covered with the protective layer, the permanent magnet is prevented from being damaged by the drop impact of the bulk particles.

In the above foreign substance removing apparatus, the non-magnetic material row having one or more predetermined gaps is further provided at the uppermost stage, so that the largest drop impact of the bulk particles can be absorbed. This has the advantage that damage to the protective layer of the permanent magnet row can be reduced. In particular, by setting the gap between the non-magnetic materials, it is possible to sufficiently absorb the drop impact of the bulk particles in the non-magnetic material row.

The durability can be improved by using a stainless steel material for the protective layer and the nonmagnetic material. Further, since the permanent magnet is composed of a plurality of annular magnet pieces arranged in the longitudinal direction around the iron core and the yoke is arranged between the magnet pieces, it is possible to prevent a reduction in the magnetic flux density of the permanent magnet pieces.

The foreign matter removing apparatus and the foreign matter removing mechanism according to the present invention are applicable to removing foreign matter from a bulk particle group in a fibrous, granular, powdery, flake, or pellet form.
In particular, it is suitably used for removing metallic foreign matter from CS or GF.

The number of permanent magnets provided in the permanent magnet row,
The number of stages of the permanent magnet row, the magnetic flux density in the gap between the permanent magnets,
By using the parameters such as the gap between the permanent magnets in the row of permanent magnets, the interval between the upper and lower stages of the row of permanent magnets, the thickness of the protective layer, and the like, it is possible to remove foreign substances having a predetermined diameter range.

The foreign matter removing mechanism according to the second aspect of the present invention comprises:
A supply device for transporting a bulk particle group to an inlet of a first container and / or a foreign particle removing device for accommodating a bulk particle particle containing a foreign material above the foreign particle removing device of the first invention; A second container for accommodating a bulk particle group from which foreign matter has been removed is provided below. As a result, it is possible to consistently manufacture up to the final product in a packaged state using the bulk particles containing foreign substances as raw materials. In addition, it is possible to prevent foreign matter from entering from surroundings after the foreign matter removal processing.

[Brief description of the drawings]

FIG. 1 is an internal cross-sectional view showing a state in which a plurality of rows of permanent magnets are overlapped in a foreign matter removing device according to a first configuration example of the present invention.

FIG. 2 is a perspective view of a top row of permanent magnet rows in the foreign matter removing device according to the first configuration example of the present invention.

FIG. 3 is a sectional view taken along a longitudinal axis of a permanent magnet used in the foreign matter removing device according to the first configuration example of the present invention.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is an internal cross-sectional view showing a state where a plurality of permanent magnet rows are superimposed in the foreign matter removing device according to the second configuration example of the present invention.

FIG. 6 is a perspective view showing a foreign matter removing mechanism of the present invention.

[Explanation of symbols]

 1. Metallic foreign matter removing device, 2. Case, 3. Permanent magnet row, 4. Permanent magnet, 42. Permanent magnet piece, 5, 12, ... gap, 7, ... iron core, 8. Yoke, 9 Protective layer, 10 Non-magnetic material, 11 Non-magnetic material row, 13 Metallic foreign matter removing mechanism, 14 First container, 15 Supply device, 16 Second , A triangular prism having an inclined surface attached to the housing Dh, NDh width, Dv spacing L, longitudinal axis.

Claims (13)

[Claims] 1. A permanent magnet array having a plurality of permanent magnets each having a longitudinal axis and having a surface covered with a protective layer and arranged in parallel with a predetermined gap is formed by vertically stacking a plurality of permanent magnets at predetermined intervals. A foreign matter removing apparatus, wherein when a bulk particle group containing foreign matter passes through the gaps of the permanent magnets in each stage, the foreign matter is adsorbed by the permanent magnet and removed from the bulk particle group. 2. The foreign matter removing apparatus according to claim 1, further comprising a nonmagnetic material row in which a plurality of nonmagnetic materials having a longitudinal axis are arranged in parallel with a predetermined gap. 3. The foreign matter removing device according to claim 2, wherein the non-magnetic material is the same as the material of the protective layer. 4. The foreign matter removing device according to claim 1, wherein the protective layer is made of an austenitic stainless steel material. 5. The permanent magnet according to claim 1, wherein each of the permanent magnets comprises a plurality of annular permanent magnet pieces arranged around an iron core and in a longitudinal direction of the iron core, and a yoke is arranged between the permanent magnet pieces. The foreign matter removing device according to any one of claims 1 to 4. 6. The foreign matter removing apparatus according to claim 1, wherein the bulk particles are in a fibrous form, a granular form, a powdery form, a flake form, or a pellet form. 7. The bulk particles are chopped strands or glass flakes of glass fiber.
3. The foreign matter removing device according to 1. 8. The foreign matter removing apparatus according to claim 1, wherein the foreign matter is metal particles having a particle size of 1 to 1000 μm. 9. The permanent magnet array has 2 to 8 permanent magnets, the number of stages of the permanent magnet array is 2 to 8, and the magnetic flux density of the permanent magnets is 10000 gauss or more on the surface of the protective layer. And the gap between the permanent magnets is 1
0 to 30 mm, the interval between the upper and lower stages of the permanent magnet row is 5 to 40 mm, and the thickness of the protective layer is 0.2 to 2 m.
The foreign matter removing device according to any one of claims 1 to 8, wherein m is m. 10. The foreign matter removing apparatus according to claim 9, wherein the magnetic flux density of the permanent magnet is 12000 gauss or more on the surface of the protective layer. 11. The foreign matter removing apparatus according to claim 2, wherein a gap between the non-magnetic members is the same as that of the row of permanent magnets. 12. A plurality of rods, each containing a permanent magnet in the protective layer and having a magnetic flux density of 12000 gauss or more on the surface of the protective layer, are arranged in parallel, and a bulk is disposed between the rods. A foreign matter removing device that removes foreign matter contained in a particle group by passing the particle group. 13. A foreign matter removing device according to claim 1, further comprising a foreign body-containing bulk body particle group disposed above the foreign matter removing device. Foreign matter removal comprising: a supply device for transporting one container and / or a group of bulk particles to an inlet of a foreign matter removing device; and a second container that accommodates a group of bulk particles arranged below the foreign matter removing device. mechanism.