Magnetic foreign object removal device

Abstract

Provided is a magnetic foreign object removing device capable of reducing adsorption leakage of magnetic foreign objects. 【Solution means】This magnetic foreign object removing device 10 includes a casing 20 having an inlet 25 and an outlet 27, and a magnetic member 30. The magnetic member 30 includes a magnet case 50 and a plurality of magnets 60 housed in the magnet case 50 with like poles facing each other via a yoke 65. The magnet case 50 has a wall portion 51 that extends continuously in the circumferential direction of the casing 20, and a plurality of the wall portions 51 are arranged at a predetermined interval S from the axis C passing through the center of the outlet toward the inner peripheral surface 20a of the casing 20 from the inlet 25 of the casing 20.

Description

Technical Field

[0001] The present invention relates to a magnetic foreign matter removing device for adsorbing and removing magnetic foreign matter from granular materials or fluids containing magnetic foreign matter by means of a magnetic field.

Background Art

[0002] For example, foreign matter contamination must be strictly excluded from granular materials or fluids that are food raw materials such as flour. As a device for removing magnetic foreign matter from such granular materials, for example, one having a casing into which the granular material is introduced and a magnet disposed inside thereof is known. Then, when the granular material is introduced from the upper opening of the casing, the magnetic foreign matter is adsorbed by the magnet, so that the magnetic foreign matter can be removed from the granular material.

[0003] For example, Patent Document 1 below describes a magnetic powder removing device having a hopper formed with an inlet into which food is introduced, a plurality of tubes disposed below the inlet, and a plurality of magnet bars inserted into and removed from each tube. Further, the plurality of tubes are disposed in the hopper at a predetermined interval.

[0004] And, by the food passing between the plurality of tubes disposed in the hopper, magnetic foreign matter in the food is adsorbed and removed by the magnetic field from the magnet bars.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the magnetic powder removing device of the above-mentioned Patent Document 1, a plurality of pipe bodies into which magnet bars are inserted are arranged in a hopper. However, since the gaps between the pipe bodies are relatively large, magnetic foreign matters cannot be completely adsorbed from the food passing through the gaps, and there is a risk of adsorption leakage.

[0007] In particular, it is often difficult to arrange the magnet bar close to the inner surface of the side wall of the hopper. Therefore, the inner surface of the side wall of the hopper is likely to become a dead space where the magnetic field of the magnet bar hardly reaches, and adsorption leakage of magnetic foreign matters is likely to occur.

[0008] In addition, since the magnetic fields at both axial ends of the magnet bar are weaker than those at the central part in the axial direction, there is a lot of adsorption leakage at both ends of the magnet bar. When a plurality of such magnet bars are arranged, the locations where adsorption leakage occurs in the hopper become more numerous.

[0009] Therefore, an object of the present invention is to provide a magnetic foreign matter removing device capable of reducing adsorption leakage of magnetic foreign matters from a granular material or a fluid containing magnetic foreign matters.

Means for Solving the Problems

[0010] To achieve the above object, the present invention is a magnetic foreign matter removing device that adsorbs and removes the magnetic foreign matter from a granular material or a fluid containing the magnetic foreign matter by a magnetic field, and includes an inlet for introducing the granular material or the fluid, and a casing having an outlet for discharging the granular material or the fluid, and a magnetic member disposed inside the casing for adsorbing and removing the magnetic foreign matter. The magnetic member includes a magnet case and a plurality of magnets housed in the magnet case with like poles facing each other via yokes. The magnet case has a wall portion that continuously extends in the circumferential direction of the casing, and the wall portions are configured to be arranged at a predetermined interval toward the inner peripheral surface of the casing from the axis passing through the center of the outlet and from the inlet of the casing toward the outlet. wherein the magnetic member has a plurality of similar shapes with different outer dimensions, and the wall portion of the magnet case forms an annular shape without a circumferential break, and is arranged in a multi-annular shape inside the casing It is characterized by the above.

[0011] According to the above invention, since the wall portions of the magnet case of the magnetic member are configured to be arranged in a plurality at a predetermined interval from the axis of the casing toward the inner peripheral surface of the casing, the wall portions of the magnet case of the magnetic member can be densely arranged over a wide range inside the casing to such an extent that the powder particles or fluid can pass through, and it becomes easier to arrange the wall portions of the magnet case close to the inner peripheral surface of the casing, and it is possible to make it difficult to generate a dead space on the inner periphery of the casing.

[0012] Further, since the magnet case has a wall portion that continuously extends in the circumferential direction of the casing, in the magnetic member, can it be made into a structure without an end portion where the magnetic field is weak (for example, a structure in which the magnet case of the magnetic member is annular), or even if an end portion of the magnetic member exists, the end portion can be arranged as close as possible to the inner peripheral surface of the casing. And in the former case, the locations where adsorption leakage occurs can be reduced, and in the latter case, for example, compared with a linear structure of the magnetic member, it is possible to make it difficult for adsorption leakage to occur at the end portion of the magnetic member.

[0013] Therefore, this magnetic foreign matter removing device can reduce the adsorption leakage of magnetic foreign matter from the powder particles or fluid.

[0015] Also , since the wall portions of the magnet case of the magnetic member have the above structure, it becomes easier to manufacture the magnetic member and the cost of the entire device can be reduced. Also, by appropriately adjusting the shape and arrangement number of the magnetic members, it is possible to flexibly respond to changes in the size and shape of the internal space of the casing, etc., and the versatility can be enhanced.

[0016] Further, since the wall portion of the magnet case of the magnetic member forms an annular shape without a break in the circumferential direction, there are no axially both end portions where the magnetic field is weak like the linear magnet bar described in Patent Document 1. That is, since it can be made into a structure without a location where the magnetic field weakens, the adsorption leakage of magnetic foreign matter from powder particles, etc. can be further reduced.

[0017] Magnetic foreign matter removal device of the present invention Another one is a magnetic foreign matter removing device that adsorbs and removes the magnetic foreign matter from the granular material or fluid containing the magnetic foreign matter by a magnetic field, comprising a casing having an inlet for introducing the granular material or fluid and an outlet for discharging the granular material or fluid, and a magnetic member disposed inside the casing for adsorbing and removing the magnetic foreign matter, the magnetic member having a magnet case and a plurality of magnets housed in the magnet case with like poles facing each other via a yoke, the magnet case having a wall portion extending continuously in the circumferential direction of the casing, and the wall portion being configured to be arranged in a plurality at a predetermined interval from the axis passing through the center of the outlet and facing the inner circumferential surface of the casing from the inlet of the casing toward the outlet The casing is formed such that the inner peripheral dimension on the discharge port side is smaller than the inner peripheral dimension on the inlet port side, and the wall portion of the magnet case has a spiral shape continuously wound so as to form a spiral along the axis, and is arranged along the inner peripheral surface of the casing and separated from the inner peripheral surface of the casing. characterized by

[0018] The above Invention According to the above, since the wall portion of the magnet case has a continuously wound spiral shape, the workability when arranging the magnetic member inside the casing can be improved, and the workability when removing the magnetic member from the inside of the casing can also be improved. Further, when the casing has a structure (hopper structure) in which the upper part expands and the lower part narrows, the dead space on the inner peripheral surface of the casing can be made less likely to occur.

[0019] Magnetic foreign matter removal device of the present invention Another one is a magnetic foreign matter removing device that adsorbs and removes the magnetic foreign matter from the granular material or fluid containing the magnetic foreign matter by a magnetic field, comprising a casing having an inlet for introducing the granular material or fluid and an outlet for discharging the granular material or fluid, and a magnetic member disposed inside the casing for adsorbing and removing the magnetic foreign matter, the magnetic member having a magnet case and a plurality of magnets housed in the magnet case with like poles facing each other via a yoke, the magnet case having a wall portion extending continuously in the circumferential direction of the casing, and the wall portion being configured to be arranged in a plurality at a predetermined interval from the axis passing through the center of the outlet and facing the inner circumferential surface of the casing from the inlet of the casing toward the outlet The wall portion of the magnet case has a spiral shape continuously wound so as to form a spiral from the axis of the casing toward the inner peripheral surface of the casing. characterized by

[0020] The above Invention According to the above, since the wall portion of the magnet case has a continuously wound spiral shape, the workability when arranging the magnetic member inside the casing can be improved, and the workability when removing the magnetic member from the inside of the casing can also be improved. Further, when the casing has a structure such as a transfer pipe, it becomes easier to cope with.

[0021] In the magnetic foreign matter removal device of the present invention, the magnet case has a shape with corners, and the yoke located between the magnet located at the corner of the magnet case and another magnet adjacent to the magnet preferably has an expandable spring shape.

[0022] According to the above aspect, since the yoke positioned between the magnet located at the corner of the magnet case and the other magnets has an expandable and contractible spring shape, the yoke can be arranged at the corner of the magnet case with a reduced risk of movement, and the attractive force from the yoke can be stably exerted.

[0023] In the magnetic foreign matter removing device of the present invention, it is preferable that the magnetic member is held in a state separated from the inner peripheral surface of the casing via a holding member.

[0024] According to the above aspect, since the magnetic member is held in a state separated from the inner peripheral surface of the casing via the holding member, it is possible to prevent the deposition of granular materials or the like between the inner peripheral surface of the casing and the outer periphery of the magnetic member, and the granular materials or the like can smoothly pass through the gap between the inner peripheral surface of the casing and the outer peripheral surface of the magnetic member, and the adsorption leakage of magnetic foreign matters from the granular materials or the like can be further reduced.

Effects of the Invention

[0025] According to the present invention, over a wide range inside the casing, the wall portion of the magnet case of the magnetic member can be densely arranged to such an extent that granular materials or fluid can pass through, and it is easy to arrange the wall portion of the magnet case close to the inner peripheral surface of the casing, making it difficult to generate a dead space inside the inner periphery of the casing. Therefore, the adsorption leakage of magnetic foreign matters from the granular materials or fluid can be reduced.

Brief Description of the Drawings

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Embodiments for Carrying Out the Invention

[0027] (An embodiment of the magnetic foreign matter removing device) Hereinafter, with reference to FIGS. 1 to 9, a first embodiment (a structure in which magnetic members are arranged in a multi-ring shape) of the magnetic foreign matter removing device according to the present invention will be described.

[0028] As shown in FIG. 1, the magnetic foreign matter removing device 10 (hereinafter, also simply referred to as "removing device 10") in this embodiment adsorbs and removes magnetic foreign matter from a granular material or fluid containing magnetic foreign matter by a magnetic field, and has an inlet 25 for introducing the granular material or fluid, and a casing 20 having an outlet (not shown) for discharging the granular material or fluid, and a plurality of magnetic members 30, 31, 32, 33, 34 arranged inside the casing 20 for adsorbing and removing magnetic foreign matter.

[0029] Further, this removing device 10 further has a holding member 70 for holding a plurality of magnetic members 30, 31, 32, 33, 34 inside the casing 20 while maintaining their shapes, structures, mutual arrangement relationships, layouts, correlation relationships, etc., in a state separated from the casing 20.

[0030] The casing 20 is formed such that the inner peripheral dimension on the outlet side (not shown) is smaller than the inner peripheral dimension on the inlet 25 side.

[0031] More specifically, the casing 20 in this embodiment has a main body portion 21 that is substantially cylindrical with a constant diameter and extends in the vertical direction, an inclined portion 23 that is substantially conical cylindrical (substantially funnel-shaped) and extends downward from the lower end portion in the extending direction of the main body portion 21 so as to gradually decrease in diameter, and an extending portion 24 that extends with a constant diameter from the tip end in the extending direction of the inclined portion 23. Further, an inlet 25 is provided at the upper opening of the main body portion 21, and an outlet (not shown) is provided below the extending portion 24.

[0032] That is, the casing 20 of this embodiment is a so-called hopper in which the inlet is disposed above and the outlet is disposed below so that the powder or fluid naturally falls by gravity.

[0033] Furthermore, both the inlet 25 and the outlet (not shown) are substantially circular hole-shaped, and the inlet 25 and the outlet are concentrically arranged. Here, a line that extends from the inlet 25 of the casing 20 toward the outlet and passes through the center of the outlet is defined as the axis C.

[0034] The holding member 70 has an annular base frame 71 and a plurality of diagonal frames 72 that extend obliquely downward toward the outlet side of the casing 20 at equal intervals in the circumferential direction from the inner peripheral edge of the base frame 71. As a whole, the holding member 70 has a structure in which the diameter expands upward and gradually decreases downward. Here, it has four diagonal frames 72.

[0035] Further, the base frame 71 has an outer diameter that is the maximum outer diameter among the plurality of magnetic members 30, 31, 32, 33, 34 and is larger than the outer diameter of the magnetic member 34 disposed at the uppermost part of the casing 20. This base frame 71 is disposed on the ceiling surface side of the magnetic member 34 and serves as a portion for fixing the magnetic member 34.

[0036] Furthermore, the outer peripheral portion of the base frame 71 is supported at the boundary portion between the lower end portion of the main body portion 21 and the upper end portion of the inclined portion 23 of the casing 20 (see FIG. 1). As a result, the holding member 70 is disposed inside the casing 20 via the base frame 71.

[0037] On the one hand, each diagonal frame 72 is connected to the inner circumference of the magnetic members 34, 33, 32, 31, 30 by welding or the like so that the positions and layouts of the magnetic members 34, 33, 32, 31, 30 are maintained.

[0038] Also, a plurality of magnetic members 30, 31, 32, 33, 34 are connected to each other via a holding member 70, and a single assembly (magnetic member assembly) is formed as a whole.

[0039] Then, by the holding member 70 having the above configuration, while maintaining a layout in which a plurality of magnetic members 34, 33, 32, 31, 30 form a multi-ring shape in the axial direction of the casing 20, they are held in a state of being separated from the inner peripheral surface 20a (the inner peripheral surfaces of the main body portion 21, the inclined portion 23, and the extending portion 24) of the casing 20.

[0040] It can also be said that the plurality of magnetic members 34, 33, 32, 31, 30 are held in a state of being suspended inside the casing 20 by the holding member 70.

[0041] Also, each magnetic member 30, 31, 32, 33, 34 has a magnet case 50 and a plurality of magnets 60 housed in the magnet case 50 with like poles facing each other via a yoke 65.

[0042] Furthermore, each magnetic member 30, 31, 32, 33, 34 has a plurality of annular wall portions 51 of the magnet case 50 that are circumferentially continuous and have similar shapes with different outer dimensions, and are arranged to form a multi-ring shape inside the casing 20.

[0043] Figure 3 shows a single predetermined magnetic member. As shown in the figure, the magnet cases 50 of the magnetic members 30, 31, 32, 33, and 34 are configured such that their wall portions 51 form an annular shape (circular ring shape) as a whole. Also, the "annular shape" in the present invention means a shape without a break in the circumferential direction, that is, a shape that is not divided or cut in the circumferential direction and extends continuously in the circumferential direction.

[0044] The annular magnet case 50 is formed, for example, by joining one end and the other end in the extending direction of a single wall portion structure extending in a cylindrical shape to each other, or by preparing a plurality of wall portion structures having a substantially arc shape, arranging each wall portion structure in an annular shape, and then joining the adjacent end portions in the circumferential direction to each other.

[0045] Note that FIG. 4 is a cross section taken along the line A-A in FIG. 3 (a cross section orthogonal to the opening direction of the annular portion of the magnetic member), and FIG. 5 shows a cross section taken along the line B-B in FIG. 1 (a cross section orthogonal to the extending direction of the annular portion of the magnetic member 30).

[0046] As shown in FIG. 5 above, the wall portion 51 of the magnet case 50 has a cylindrical cross section with a constant thickness. That is, the inner circumference (entire inner circumference) and the outer circumference (entire outer circumference) of the wall portion 51 of the magnet case 50 are both circular.

[0047] Also, as shown in FIG. 2, the outer diameter of the magnet case 50 increases (expands) in the order of the magnetic members 30, 31, 32, 33, and 34. Note that the outer dimension of the magnetic member means the outer diameter when the magnetic member is annular as in this embodiment, and means the largest outer dimension when the magnetic member is a rectangular ring or the like.

[0048] Then, as shown in the range A shown in FIG. 2, from the axis C of the casing 20 toward the inner peripheral surface 20a of the casing 20, the wall portion 51 of the magnet case 50 of the magnetic member 30, the wall portion 51 of the magnet case 50 of the magnetic member 31, the wall portion 51 of the magnet case 50 of the magnetic member 32, the wall portion 51 of the magnet case 50 of the magnetic member 33, and the wall portion 51 of the magnet case 50 of the magnetic member 34 are arranged at predetermined intervals S in this order.

[0049] That is, the magnet case 50 is configured such that a plurality of wall portions 51 continuously extending in the circumferential direction of the casing 20 are arranged at predetermined intervals S from the axis C of the casing 20 toward the inner peripheral surface 20a.

[0050] Further, the magnetic members 30, 31, 32, 33, 34 are arranged concentrically with different heights from the lower side to the upper side of the casing 20, that is, the radial centers of the magnetic members 30, 31, 32, 33, 34 coincide with the axis C of the casing 20.

[0051] Specifically, as shown in FIG. 1, the magnetic member 30 is arranged near the tip of the extending direction of the inclined portion 23 of the casing 20. Further, the magnetic members 31, 32, 33, 34 are arranged along the inner peripheral surface 20a of the casing 20. As a result, the magnetic members 30, 31, 32, 33, 34 are arranged in order from the lower side to the upper side inside the casing 20.

[0052] Note that the outer peripheries of the wall portions 51 of the magnetic members 30, 31, 32, 33, 34 do not contact the inner peripheral surface 20a of the casing 20 and are spaced apart.

[0053] And as described above, as a result of arranging a plurality of magnetic members 30, 31, 32, 33, 34 inside the casing 20 via the holding member 70, as shown in FIG. 2, when the removing device 10 is viewed from the direction of the axis C of the casing 20 (when viewed from the planar direction), the magnetic members 30, 31, 32, 33, 34 are arranged in a multi-ring shape.

[0054] Also, in the case of this embodiment, as shown in FIG. 2, a plurality of magnetic members are arranged such that a gap (predetermined interval S) is formed between adjacent magnetic members when the casing 20 is viewed from the axial direction.

[0055] However, as the plurality of magnetic members, it is preferable to arrange them so that no gap is formed between adjacent magnetic members when the casing is viewed from the axial direction. This is to prevent powder particles or the like from passing through without contacting the magnetic members.

[0056] Further, the magnet cases 50 of the magnetic members 30, 31, 32, 33, 34 are formed of non-magnetic materials such as stainless steel (austenitic stainless steel) such as SUS304 and SUS316, aluminum alloy, titanium alloy, synthetic resin, and silicone.

[0057] Also, there are a plurality of magnets 60 constituting the magnetic members, and these plurality of magnets 60 are housed in the magnet case 50 with the same poles facing each other via a yoke 65, and the plurality of magnets 60 are arranged in an annular shape.

[0058] More specifically, each magnet 60 in this embodiment is a permanent magnet having a cylindrical shape (solid round bar shape) with a constant outer diameter and extending a predetermined length. One end portion in the extending direction of the magnet 60 forms an N pole 61, and the other end portion in the extending direction forms an S pole 62. Also, the yoke 65 in this embodiment is, for example, a plate-like body made of a metal such as pure iron or low-carbon steel. Note that the material of the yoke may be a metal material having rubber characteristics, so-called metal paste, magnetic silicone, or the like.

[0059] Note that connection holes may be formed in the connection directions of the plurality of magnets respectively, and a linear body may be inserted through these connection holes, and the plurality of magnets may be connected in a bead-like manner via the yoke by this linear body. Also, connection holes may be formed in the connection directions of the plurality of yokes respectively, and a linear body may be inserted through these connection holes, and the plurality of yokes may be connected in a bead-like manner via the magnets by this linear body.

[0060] When configured as described above, within the case, the adhesion between the magnet and the yoke can be enhanced, and the occurrence of a gap between the adjacent magnet and the yoke can be suppressed.

[0061] Then, as shown in FIG. 4, while the N - poles 61, 61 of the adjacent magnets 60, 60 are arranged to face each other and the yoke 65 is interposed between the N - poles 61, 61, or while the S - poles 62, 62 of the adjacent magnets 60, 60 are arranged to face each other and the yoke 65 is interposed between the S - poles 62, 62, a plurality of magnets 60 are stored and arranged in the magnet case 50. As a result, a plurality of magnets 60 are arranged in an annular shape within the magnet case 50.

[0062] Also, since the yoke 65 is arranged between the like - poles of the adjacent magnets 60, 60, the magnetic force of the magnet 60 acts on the yoke 65, and the yoke 65 becomes an adsorption portion for magnetic foreign matter.

[0063] (Modification example of the magnetic foreign matter removal device) The structure and shape of the magnetic foreign matter removal device in the present invention, and the shapes and structures of the casing and magnetic members constituting the magnetic foreign matter removal device are not limited to the above - described aspects.

[0064] The main body portion constituting the casing may have, for example, a substantially square - tube shape or a substantially elliptical - tube shape. Also, the inclined portion constituting the casing may have, for example, a substantially square - pyramid - tube shape that expands upward and narrows downward, or may further have a tubular shape that extends such that the discharge port is eccentric with respect to the inlet port.

[0065] Also, in the case of this embodiment, five magnetic members are arranged in the casing 20, but the number of magnetic members arranged inside the casing may be 1, 2, 3, 4, 6 or more, and is not particularly limited.

[0066] Furthermore, although the casing 20 of this embodiment serves as a so-called hopper as described above, the casing may also be a transfer pipe (which can also be referred to as a conveying pipe, a transfer case, or a conveying case) that transfers powder particles or fluids by air, gas, vibration, a conveyor, etc. In this case, the inlet and outlet are in a direction along the horizontal direction or inclined at a predetermined angle with respect to the horizontal direction. At this time, it is preferable to direct the opening direction of the magnetic member in the transfer direction of the powder particles or fluids.

[0067] On the other hand, the magnetic member does not have to be annular. For example, it may have a polygonal multi-annular shape such as a triangle, a quadrilateral, a pentagon, or a hexagon, an elliptical annular shape, an annular shape in which both longitudinal ends of a rectangle are arc-shaped, or an irregular annular shape composed of a combination of a curved surface shape and an angular shape, and is not particularly limited.

[0068] FIG. 6 shows a first modification of the first embodiment.

[0069] As shown in FIG. 6, in this first modification, the shape of the holding member 70A is different from the structure of FIG. 1. That is, this holding member 70A has an overhanging portion 71a that protrudes more from the outer periphery of the magnetic member 34 than the outer periphery of the base frame 71. And this overhanging portion 71a is placed on the upper end portion 21a of the main body portion 21 of the casing 20.

[0070] As a result, the holding member 70A holds the plurality of magnetic members 34, 33, 32, 31, 30 in a state of being separated from the inner peripheral surface 20a of the casing 20 while maintaining a multi-annular layout.

[0071] Note that in this first modification, compared with the structure of FIG. 1, it is possible to separate the plurality of magnetic members 34, 33, 32, 31, 30 with a larger gap from the inner peripheral surface 20a of the casing 20.

[0072] Incidentally, in the holding member 70 shown in FIGS. 1 and 6, the annular magnetic members 30, 31, 32, 33, 34 are connected to the outer periphery of the plurality of diagonal frames 72. However, the holding structure of the plurality of magnetic members by the holding member 70 is not limited to this.

[0073] For example, engaging means for detachably engaging both the diagonal frame and the magnetic member may be provided on one of the diagonal frame or the magnetic member constituting the holding member, and the magnetic member may be engaged with the diagonal frame via the engaging means and held.

[0074] As an example, a structure can be adopted in which a plurality of curved concave portions are formed at the same height position on the inner periphery of the plurality of diagonal frames 72, and the magnetic members are fitted into and engaged with these concave portions for holding.

[0075] More specifically, a first concave portion, a second concave portion, a third concave portion, a fourth concave portion, and a fifth concave portion are respectively formed on the inner periphery of each diagonal frame 72 in order from below the diagonal frame, and the magnetic members corresponding to the respective concave portions are fitted and engaged, so that the plurality of magnetic members 30, 31, 32, 33, 34 can be held while maintaining a multi-ring layout in the axial direction of the casing. In the case of this structure, each concave portion forms the above-mentioned "engaging means".

[0076] FIGS. 7 and 8 show a second modification of the first embodiment.

[0077] As shown in FIG. 7, in this first modification, a plurality of angular-ring-shaped magnetic members 30A, 31A, 32A, 33A, 34A are arranged in the casing 20 so as to form a multi-ring shape when the removing device 10 is viewed from the planar direction. In this case, it is preferable that the inclined portion 23 of the casing 20 has a substantially square pyramid shape.

[0078] Further, the magnet cases 50 of the magnetic members 30A, 31A, 32A, 33A, and 34A are configured to form a rectangular annular (rectangular ring shape) having corner portions 54. Specifically, the magnet case 50 forms a rectangular annular shape having four corner portions 54, and each corner portion 54 has a slightly rounded shape.

[0079] And there are a plurality of magnets 60 constituting the magnetic member, and these plurality of magnets 60 are housed in a linear portion in the magnet case 50 in a state where like poles face each other via a yoke 65, and the plurality of magnets 60 are arranged to form an annular shape.

[0080] Furthermore, as shown in FIG. 8, the yoke 65A located between the magnet 60 positioned at the corner portion 54 of the magnet case 50 and another magnet 60 adjacent to the magnet 60 (the magnet located at the end of the linear portion) has an expandable spring shape. Specifically, the yoke 65A has a spring shape formed by folding a plurality of predetermined metal plates into a bellows shape. Note that the yoke may be in the form of a coil spring formed by winding a predetermined metal wire.

[0081] Also, when connecting the magnet located at the corner portion and the magnet located at the end of the linear portion, instead of using the spring-shaped yoke 65A, a configuration may be adopted in which the magnets are connected in a bead-chain shape by a linear body.

[0082] Furthermore, in the embodiments shown in FIGS. 1 and 6, the annular magnetic members 30, 31, 32, 33, and 34 are arranged concentrically with different heights, but a plurality of magnetic members having similar shapes may be arranged concentrically at the same height position.

[0083] For example, in the third modification of the first embodiment shown in FIGS. 9 and 10, a plurality of annular magnetic members 30, 31, 32, 33, and 34 are arranged concentrically at the same height position (the plurality of magnetic members 30, 31, 32, 33, and 34 are arranged to form a concentric multiple annular shape at the same height position).

[0084] Further, the holding member 70B has an annular base frame 71 having an outer diameter larger than the outer diameter of the magnetic member 34 with the maximum outer diameter, and a support frame 73 arranged in a substantially cross shape on the inner periphery of the base frame 71. And, predetermined positions at one end of each of the magnetic members 31, 31, 32, 33, 34 on the opening direction side are supported and fixed to the base frame 71 and the support frame 73.

[0085] As a result, the plurality of magnetic members 30, 31, 32, 33, 34 are connected to each other via the holding member 70B, and an assembly (magnetic member assembly) is configured as a whole.

[0086] Note that the support frame may be, for example, in a lattice shape, as long as it can support a plurality of magnetic members.

[0087] Then, as shown in FIG. 10, a support member 75 made of a wire mesh or the like through which powder or fluid can pass is supported at the boundary between the lower end of the main body 21 of the casing 20 and the upper end of the inclined portion 23. Further, a plurality of magnetic members 30, 31, 32, 33, 34 are placed on the support member 75 via the holding member 70B.

[0088] As a result, the holding member 70B holds the plurality of magnetic members 34, 33, 32, 31, 30 in a state of being separated from the inner peripheral surface 20a of the casing 20 while maintaining a layout in which they form concentric multiple rings at the same height position.

[0089] Further, as shown in FIG. 11, the plurality of magnetic members 34, 33, 32, 31, 30 held by the holding member 70B as described above may be arranged in the casing 20 by placing the outer peripheral portion of the support member 75 on the upper end portion 21a of the main body 21 of the casing 20.

[0090] Also in this case, the holding member 70B can hold the plurality of magnetic members 34, 33, 32, 31, 30 in a state of being separated from the inner peripheral surface 20a of the casing 20 while maintaining a layout in which they form multiple rings.

[0091] Furthermore, although the magnet 60 in this embodiment is cylindrical, the magnet may be, for example, a bar-shaped magnet with a square cross-section, a bar-shaped magnet with an elliptical cross-section, a bar-shaped magnet with a kamaboko-shaped cross-section, or a cylindrical (doughnut-shaped, ring-shaped) or square-tube-shaped magnet even if the cross-section is not solid.

[0092] (Function and effect of the magnetic foreign object removal device) Next, the usage method and function and effect of the removal device 10 having the above structure will be described.

[0093] That is, the powder or fluid containing magnetic foreign objects (hereinafter also simply referred to as "powder, etc.") is introduced into the main body 21 of the casing 20 through the inlet 25 of the casing 20 of the removal device 10. Then, the powder, etc. introduced into the main body 21 enters the inclined portion 23 by naturally falling due to gravity or the like.

[0094] Thereafter, the magnetic foreign objects are adsorbed and removed from the powder, etc. by the magnetic fields of the plurality of magnetic members 30, 31, 32, 33, 34. That is, the magnetic force of the magnets 60, 60 arranged adjacent to each other in the magnet case 50 acts on the yoke 65, and the yoke 65 becomes an adsorption portion, and the portion of the magnet case 50 where the yoke 65 is located becomes an adsorption surface, and it becomes possible to adsorb the magnetic foreign objects by the adsorption surface.

[0095] And in the present invention, the wall portions 51 of each magnet case 50 constituting the magnetic members 30, 31, 32, 33, 34 are configured to be arranged at a predetermined interval S from the axis C of the casing 20 toward the inner peripheral surface 20a (see FIG. 2).

[0096] Therefore, over a wide range within the casing 20, the wall portions 51 of the respective magnet cases 50 of the magnetic members 30, 31, 32, 33, 34 can be densely arranged to such an extent that powder particles or the like can pass through, and the wall portions 51 of the magnet cases 50 can be easily arranged close to the inner peripheral surface 20a of the casing 20, making it difficult to generate a dead space on the inner periphery of the casing. As a result, adsorption leakage of magnetic foreign matter from powder particles or the like can be reduced.

[0097] Further, since the magnet case 50 has a wall portion 51 that continuously extends in the circumferential direction of the casing 20, in the magnetic members 30, 31, 32, 33, 34, can a structure without an end portion where the magnetic field is weak be achieved (for example, a structure in which the magnet case of the magnetic member is annular), or even if an end portion of the magnetic member exists, can the end portion be arranged as close as possible to the inner peripheral surface of the casing?

[0098] And in the former case, the locations where adsorption leakage occurs can be reduced, and in the latter case, for example, compared with a linear structure of the magnetic member, adsorption leakage can be less likely to occur at the end portion of the magnetic member.

[0099] Therefore, this removal device 10 can reduce adsorption leakage of magnetic foreign matter from powder particles or fluid.

[0100] Also, as described above, the magnetic member can have a structure without an end portion where the magnetic field is weak, or even if an end portion of the magnetic member exists, the end portion can be arranged as close as possible to the inner peripheral surface of the casing. Therefore, it is possible to realize a removal device with less adsorption leakage with a relatively simple structure. As a result, the manufacturing cost of the removal device can be reduced, and the management and maintenance of the removal device are also facilitated.

[0101] Also, in this embodiment, the magnetic members 30, 31, 32, 33, 34 have a plurality of similar shapes with different outer dimensions, where the wall portions 51 of the respective magnet cases 50 form an annular shape without circumferential breaks, and are arranged in a multi-annular shape inside the casing 20 (see FIG. 2).

[0102] According to the above aspect, since the wall portions 51 of the respective magnet cases 50 of the magnetic members 30, 31, 32, 33, 34 have the above structure, the magnetic members are easy to manufacture and the cost of the entire removing device can be reduced. Further, by appropriately adjusting the shape and the number of arrangements of the magnetic members, it is possible to flexibly cope with changes in the size and shape of the internal space of the casing, etc., and the versatility can be enhanced.

[0103] Further, since the wall portions 51 of the respective magnet cases 50 of the magnetic members 30, 31, 32, 33, 34 form an annular shape without a break in the circumferential direction, there are no both end portions in the axial direction where the magnetic field is weak like the linear magnet bar described in Patent Document 1. That is, since each of the magnetic members 30, 31, 32, 33, 34 can have a structure in which there is no portion where the magnetic field weakens, the adsorption leakage of magnetic foreign matters from the powder particles or the like can be further reduced.

[0104] Further, in this embodiment, the casing 20 is formed such that the inner peripheral dimension on the discharge port side (not shown) is smaller than the inner peripheral dimension on the inlet port 25 side, and one magnetic member 30 is disposed in a state of being separated from the inner peripheral surface 20a of the casing 20 at an inner portion near the discharge port of the casing 20 (here, the magnetic member 30 is disposed near the tip of the extending direction of the inclined portion 23 of the casing 20), and magnetic members 31, 32, 33, 34 having an outer dimension larger than that of the magnetic member 30 are disposed along the inner peripheral surface 20a of the casing 20 and in a state of being separated from the inner peripheral surface 20a of the casing 20.

[0105] According to the above aspect, since the plurality of magnetic members 30, 31, 32, 33, 34 are arranged in the above layout with respect to the casing 20, it is possible to more difficultly generate a dead space where the magnetic field does not reach on the inner periphery of the casing 20, and the adsorption leakage of magnetic foreign matters from the powder particles or the like introduced from the inlet port 25 of the casing 20 and discharged from a discharge port (not shown) can be further reduced.

[0106] Further, as in the second modification shown in FIGS. 7 and 8, when a plurality of magnetic members 30A, 31A, 32A, 33A, 34A having a rectangular annular shape are arranged in the casing 20 so as to form a multi-layered annular shape when the removing device 10 is viewed from the planar direction, and the yoke 65A located between the magnet 60 positioned at the corner 54 of the magnet case 50 and another magnet 60 adjacent to the magnet 60 has an expandable and contractible spring shape, the following effects are achieved.

[0107] That is, when the magnet case 50 has a rectangular annular shape, a gap is likely to occur between the magnet 60 arranged at the corner 54 thereof and another adjacent magnet 60, and there is a possibility that the yoke arranged therebetween may move slightly, and the attracting force from the yoke may not be stably exhibited.

[0108] On the other hand, according to the above aspect, since the yoke 65A located between the magnet 60 positioned at the corner 54 of the polygonal annular magnet case 50 and another magnet 60 has an expandable and contractible spring shape, it is possible to arrange the yoke 65A at the corner 54 of the magnet case 50 with a reduced risk of movement, and the attracting force from the yoke 65A can be stably exhibited.

[0109] Also, as in the third modification shown in FIGS. 9 and 10, when a plurality of magnetic members 30, 31, 32, 33, 34 are connected to each other via a holding member 70, the following effects are achieved.

[0110] That is, since the plurality of magnetic members 30, 31, 32, 33, 34 are connected to each other via the holding member 70 to form a single assembly as a whole, the plurality of magnetic members 30, 31, 32, 33, 34 can be arranged inside the casing 20 at once, and the plurality of magnetic members 30, 31, 32, 33, 34 can also be removed from the inside of the casing 20 at once.

[0111] As a result, the workability of arranging the magnetic members inside the casing and the workability of removing the magnetic members from inside the casing are improved. Further, by supporting each of the magnetic members 30, 31, 32, 33, 34 by the holding member 70, the entire assembly can be reinforced.

[0112] Note that in the embodiments shown in FIGS. 1, 6, and 11, the same effects as described above (improvement in arrangement workability and removal workability, reinforcement of the entire assembly) can be obtained.

[0113] Also, as in the embodiments shown in FIGS. 1, 6, 10, and 11, a plurality of magnetic members 34, 33, 32, 31, 30 are held in a state of being separated from the inner peripheral surface 20a of the casing 20 while maintaining a predetermined layout by the holding members 70, 70A, 70B.

[0114] Thereby, the following effects can be obtained. That is, when the magnetic member is in contact with the inner peripheral surface of the casing, there is a possibility that deposition of powder particles or the like may occur at the contact portion, which may hinder the passage of powder particles or the like through the magnetic member.

[0115] However, in the case of the present embodiment, as described above, the magnetic members 30, 31, 32, 33, 34 are held in a state of being separated from the inner peripheral surface 20a of the casing 20 via the holding members 70, 70A, 70B. Therefore, deposition of powder particles or the like is prevented between the inner peripheral surface 20a of the casing 20 and the outer periphery of the magnetic member, and powder particles or the like can pass smoothly through the gap between the inner peripheral surface 20a of the casing 20 and the outer peripheral surface of the magnetic member, and adsorption leakage of magnetic foreign matter from the powder particles or the like can be reduced more.

[0116] (Second Embodiment of Magnetic Foreign Matter Removing Device) FIGS. 12 to 14 show a second embodiment of the magnetic foreign matter removing device according to the present invention (a structure in which the magnetic member has a spiral shape). Note that the same reference numerals are given to substantially the same parts as those in the above embodiment, and the description thereof is omitted.

[0117] As shown in FIGS. 12 and 13, the magnetic foreign matter removal device 10A (hereinafter, also simply referred to as the "removal device 10A") in this embodiment has the following configuration.

[0118] That is, the casing 20 in this removal device 10A is formed such that the inner peripheral dimension on the discharge port side (not shown) is smaller than the inner peripheral dimension on the inlet port 25 side. The wall portion 51 of the magnet case 50 of the magnetic member 36 has a spiral shape continuously wound along the axis C of the casing 20, and is configured to be arranged along the inner peripheral surface 20a of the casing 20.

[0119] Note that the above magnetic member 36 is held by the holding member 70 in a state of being separated from the inner peripheral surface 20a of the casing 20 while maintaining the spiral shape.

[0120] Also, as shown in FIGS. 12 and 14, the wall portion 51 of the magnet case 50 has a shape in which one end portion 52 disposed on the inlet port 25 side of the casing 20 has an enlarged diameter, and gradually decreases in diameter toward the other end portion 53 disposed on the discharge port side (not shown) of the casing 20, and is continuously wound along the axis C of the casing 20 to form a spiral shape.

[0121] Furthermore, the wall portion 51 of the magnet case 50 having a spiral shape is displaced in the height direction of the one end portion 52 and the other end portion 53 along the axis C of the casing 20. That is, the wall portion 51 has different heights at the one end portion 52 and the other end portion 53 in the winding axis direction, and the heights do not match.

[0122] Also, the wall portion 51 of the magnet case 50 is wound in a spiral shape while continuously extending without being divided or cut from the one end portion 52 to the other end portion 53, and when viewed from the direction of the axis C of the casing 20 of the removal device 10A (which can also be said to be when viewed from the winding axis direction of the magnetic member itself or when viewed from the planar direction of the removal device 10A), it exhibits a circular spiral shape with a circular outer periphery and inner periphery (see FIG. 13).

[0123] That is, the wall portion 51 of the spiral magnet case 50 has a shape in which its outer peripheral surface and inner peripheral surface are wound while depicting a substantially arc-shaped curved surface.

[0124] Also, as shown in FIG. 12, one end portion 52 side and the other end portion 53 side of the wall portion 51 of the magnet case 50 have a flat shape wound so as to be orthogonal to the axis C of the casing 20.

[0125] And, as shown in the range B shown in FIG. 12, from the axis C of the casing 20 toward the inner peripheral surface 20a of the casing 20, the first winding portion 55a (the winding portion on the other end portion 53 side), the second winding portion 55b, the third winding portion 55c, the fourth winding portion 55d, the fifth winding portion 55e, the sixth winding portion 55f, the seventh winding portion 55g, and the eighth winding portion 55h (the winding portion on the one end portion 52 side) that constitute the wall portion 51 of the magnet case 50 are arranged at a predetermined interval S in this order.

[0126] That is, the magnet case 50 is configured such that a plurality of wall portions 51 that continuously extend in the circumferential direction of the casing 20 are arranged at a predetermined interval S from the axis C of the casing 20 toward the inner peripheral surface 20a.

[0127] Also, as shown in FIG. 12, the other end portion 53 of the magnet case 50 of the magnetic member 36 is arranged in a state of being separated from the inner peripheral surface 20a of the casing 20 in the vicinity of the tip portion in the extending direction of the inclined portion 23 of the casing 20, and the outer peripheral portion from the other end portion 53 side to the one end portion 52 side of the magnet case 50 is arranged along the inner peripheral surface 20a of the casing 20 and in a state of being separated from the inner peripheral surface 20a. That is, the magnetic member 36 is arranged in a separated state along the inner peripheral surface 20a of the casing 20 in the range of the outer peripheral portion from the reduced-diameter other end portion 53 side to the outer periphery of the enlarged-diameter one end portion 52 side.

[0128] The wall portion 51 of the magnet case 50 of the magnetic member 36 described above has its outer periphery and inner periphery wound in a spiral while depicting an arc-shaped curved surface, but the mode shown in FIG. 15 may also be used.

[0129] That is, the magnetic member 37 of the modified example of the second embodiment shown in FIG. 15 has an angular shape formed by a plurality of straight portions bent through the corner portions 54 when viewed from the winding axis direction (when viewed from the planar direction), presenting an angular spiral shape. Specifically, the magnet case 50 constituting the magnetic member 37 has a substantially square spiral shape with four corner portions 54, and each corner portion 54 has a slightly rounded shape.

[0130] And in the above-described second embodiment, since the wall portion 51 of the magnet case 50 forms a continuously wound spiral shape, the workability when disposing the magnetic member 36 inside the casing 20 can be improved, and the workability when removing the magnetic member 36 from the inside of the casing 20 can also be improved.

[0131] Also, when the casing 20 has a structure (hopper structure) in which the upper part expands and the lower part narrows, the dead space on the inner peripheral surface of the casing can be made less likely to occur.

[0132] Furthermore, since one end portion 52 side and the other end portion 53 side of the magnet case 50 have a flat shape wound so as to be orthogonal to the axis C of the casing 20, it is possible to easily hold the magnetic member 36 by the holding member 70 (it is easy to support and fix it to the base frame 71 etc. of the holding member 70 using the flat shape). As a result, the magnetic member 36 can be installed inside the casing 20 in a stable posture via the holding member 70.

[0133] (Third Embodiment of the Magnetic Foreign Matter Removing Device) FIGS. 16 to 22 show a third embodiment of the magnetic foreign matter removing device according to the present invention (a structure in which the magnetic member has a spiral shape). Note that the same reference numerals are given to substantially the same parts as those in the above-described embodiment, and the description thereof is omitted.

[0134] As shown in FIG. 16, the magnetic foreign object removing device 10B (hereinafter, also simply referred to as "removing device 10B") in this embodiment has the following configuration. That is, the wall portion 51 of the magnet case 50 of the magnetic member 38 in this removing device 10B has a spiral shape that is continuously wound so as to form a spiral shape from the axis C of the casing 20 toward the inner peripheral surface 20a of the casing 20.

[0135] As shown in FIGS. 16 and 17, the magnet case 50 of the magnetic member 38 is such that the heights of one end portion 52 and the other end portion 53 of its wall portion 51 are not displaced in the direction along the axis C of the casing 20 and are located at the same height.

[0136] Further, the magnetic member 38 having a spiral shape is held by a holding member 70B in the same manner as the mode shown in FIGS. 9 and 10, and is held in a state of being separated from the inner peripheral surface of the casing while the spiral shape is maintained by a holding member (not shown). In addition, in the first modification shown in FIGS. 18 and 19, the second modification shown in FIGS. 20 and 21, and the third modification shown in FIG. 22, it is also held in a state of being separated from the inner peripheral surface of the casing while the spiral shape is maintained by the holding member.

[0137] Further, one end portion 52 of the wall portion 51 of the magnet case 50 is located on the outer side in the radial direction, and from this one end portion 52 toward the central portion in the radial direction, it is wound while forming a spiral with a certain gap while continuously extending without being divided or cut, so that the other end portion 53 is arranged at the central portion in the radial direction.

[0138] That is, when the wall portion 51 of the magnet case 50 is viewed from the direction of the axis C of the casing 20 (it can also be said that when viewed from the winding axis direction of the magnetic member itself or when viewed from the planar direction of the removing device 10B), its outer peripheral surface and inner peripheral surface are wound while depicting a substantially arc-shaped curved surface, presenting a circular spiral shape.

[0139] Then, as shown in the range D shown in FIG. 16, from the axis C of the casing 20 toward the inner peripheral surface 20a of the casing 20, the first wound portion 56a (the wound portion on the other end portion 53 side), the second wound portion 56b, the third wound portion 56c, the fourth wound portion 56d, and the fifth wound portion 56e (the wound portion on the one end portion 52 side) that constitute the wall portion 51 of the magnet case 50 are arranged at predetermined intervals S in this order.

[0140] That is, the magnet case 50 is configured such that a plurality of wall portions 51 that continuously extend in the circumferential direction of the casing 20 are arranged at predetermined intervals S from the axis C of the casing 20 toward the inner peripheral surface 20a.

[0141] FIGS. 18 and 19 show a first modification of the third embodiment.

[0142] The magnetic member 39 of this first modification is basically in a spiral shape with an arcuate curved surface on its circumferential surface, similar to the magnetic member 38 shown in FIGS. 16 and 17. However, it further forms a substantially inverted U-shaped frame (which can also be said to be a portal-shaped frame) across the one end portion 52 and the other end portion 53 of the magnet case 50, and has a structure in which a handle 57 is installed.

[0143] That is, the handle 57 has a gripping portion 57a that extends a predetermined length, and a pair of connecting portions 57b, 57b that hang down parallel to each other from both longitudinal ends of the gripping portion 57a. One connecting portion 57b is joined to the one end portion 52 of the magnet case 50 by welding or the like, and the other connecting portion 57b is joined to the other end portion 53 of the magnet case 50, so that the handle 57 is installed (attached) to the magnet case 50.

[0144] FIGS. 20 and 21 show a second modification of the third embodiment.

[0145] The magnetic member 40 of this second modification example is in a spiral shape, similar to the magnetic members 38 and 39 shown in FIGS. 16 to 19. Further, a magnet 58 is fixedly provided at the other end 53 located at the central portion in the radial direction of the magnet case 50. The magnet 58 has a columnar base portion 58a and a conical tip portion 58b connected to one end of the base portion 58a.

[0146] FIG. 22 shows a third modification example of the third embodiment.

[0147] The magnetic member 41 of this third modification example has a structure in which one end 52 of the magnet case 50 is joined by welding or the like to a portion adjacent to the magnet case 50 in the radial direction.

[0148] In the magnetic members shown in FIGS. 16 to 22, the magnet case has a circular spiral shape, but similar to the modification example of the second embodiment shown in FIG. 15, it may have a substantially square rectangular spiral shape.

[0149] In the above-described third embodiment, since the wall portion 51 of the magnet case 50 has a spiral shape wound continuously, the workability when arranging the magnetic member 36 inside the casing 20 can be improved, and the workability when removing the magnetic member 36 from the inside of the casing 20 can also be improved. Also, when the casing has a structure like a transfer pipe, it becomes easier to handle.

[0150] Also, when a handle 57 is attached to the magnet case 50 as in the magnetic member 39 of the first modification example shown in FIGS. 18 and 19, an operator can hold the handle 57 to handle the magnetic member 39, improving the handling property. As a result, it becomes easier to arrange the magnetic member 39 inside the casing 20 and also easier to remove the magnetic member 39 from the inside of the casing 20.

[0151] Furthermore, when a magnet 58 is fixedly installed at the other end 53 located at the radial center of the magnet case 50, as in the magnetic member 40 of the second modified example shown in FIGS. 20 and 21, it becomes easier to capture magnetic foreign matter attempting to pass through the radial center of the magnetic member 40. As a result, the adsorption leakage of magnetic foreign matter from powders and the like can be further reduced.

[0152] Also, when one end 52 of the magnet case 50 is joined by welding or the like to a portion adjacent to it in the radial direction of the magnet case 50, as in the magnetic member 41 of the third modified example shown in FIG. 22, it becomes easier to maintain the spiral shape of the magnetic member 41, and the shape retention of the magnetic member 41 can be improved.

[0153] As a result, when arranging the magnetic member 41 inside the casing 20, it is not necessary to correct the shape of the magnetic member 41 or the shape correction work becomes simple, so the workability of arranging the magnetic member 41 inside the casing can be enhanced.

[0154] Note that the present invention is not limited to the above-described embodiments, and various modified embodiments are possible within the scope of the gist of the present invention, and such embodiments are also included in the scope of the present invention.

Explanation of Reference Numerals

[0155] 10, 10A, 10B Magnetic foreign matter removal device (removal device) 20 Casing 20a Inner peripheral surface 25 Inlet 30, 30A, 31, 31A, 32, 32A, 33, 33A, 34, 34A, 35, 36, 37, 38, 39, 40, 41 Magnetic member 50 Magnet case 51 Wall portion 52 One end 53 Other end 60 Magnet 61 N pole 62 S pole 65, 65A Yoke 70, 70A, 70B Holding member

Claims

1. A magnetic foreign matter removal device that adsorbs and removes magnetic foreign matter from powder or fluid containing the magnetic foreign matter by using a magnetic field, a casing having an inlet for introducing the powder or granular material or fluid and an outlet for discharging the powder or granular material or fluid; a magnetic member disposed inside the casing for attracting and removing the magnetic foreign matter, the magnetic member includes a magnet case and a plurality of magnets housed in the magnet case with the same poles facing each other via a yoke; the magnet case has a wall portion that extends continuously in a circumferential direction of the casing, and the wall portion is configured to be arranged at a predetermined interval from an axis that extends from the inlet of the casing toward the outlet of the casing and passes through a center of the outlet toward an inner circumferential surface of the casing, The magnetic foreign matter removal device is characterized in that the wall portion of the magnet case forms a circumferentially uninterrupted ring, and the magnetic member has multiple members of similar shapes but different outer dimensions, and is arranged in a multiple ring shape inside the casing.

2. A magnetic foreign matter removal device that adsorbs and removes magnetic foreign matter from powder or fluid containing the magnetic foreign matter by using a magnetic field, a casing having an inlet for introducing the powder or granular material or fluid and an outlet for discharging the powder or granular material or fluid; a magnetic member disposed inside the casing for attracting and removing the magnetic foreign matter, the magnetic member includes a magnet case and a plurality of magnets housed in the magnet case with the same poles facing each other via a yoke; the magnet case has a wall portion that extends continuously in a circumferential direction of the casing, and the wall portion is configured to be arranged at a predetermined interval from an axis that extends from the inlet of the casing toward the outlet of the casing and passes through a center of the outlet toward an inner circumferential surface of the casing, The casing is formed such that an inner circumferential dimension on the discharge port side is smaller than an inner circumferential dimension on the inlet side, A magnetic foreign matter removal device characterized in that the wall portion of the magnet case has a spiral shape that is continuously wound in a spiral shape along the axis, and is positioned along the inner surface of the casing but at a distance from the inner surface of the casing.

3. A magnetic foreign matter removal device that adsorbs and removes magnetic foreign matter from powder or fluid containing the magnetic foreign matter by using a magnetic field, a casing having an inlet for introducing the powder or granular material or fluid and an outlet for discharging the powder or granular material or fluid; a magnetic member disposed inside the casing for attracting and removing the magnetic foreign matter, the magnetic member includes a magnet case and a plurality of magnets housed in the magnet case with the same poles facing each other via a yoke; the magnet case has a wall portion that extends continuously in a circumferential direction of the casing, and the wall portion is configured to be arranged at a predetermined interval from an axis that extends from the inlet of the casing toward the outlet of the casing and passes through a center of the outlet toward an inner circumferential surface of the casing, A magnetic foreign matter removal device characterized in that the wall portion of the magnet case has a spiral shape that is continuously wound in a spiral shape from the axis of the casing toward the inner surface of the casing.

4. The magnet case has a shape having corners, A magnetic foreign matter removal device as described in any one of claims 1 to 3, wherein the yoke located between the magnet located at the corner of the magnet case and another magnet adjacent to the magnet is in the form of an expandable and contractible spring.

5. 3. The magnetic foreign matter remover according to claim 1, wherein the magnetic member is held in a state spaced apart from the inner circumferential surface of the casing by a holding member.

Images