Magnetic foreign matter removal device

Abstract

To provide a magnetic powder removal device which can continuously remove magnetic foreign matters from particulates or a fluid containing the magnetic foreign matters over a long time.SOLUTION: A magnetic foreign matter removal device 10 attracts magnetic foreign matters from particulates or a fluid containing the magnetic foreign matters by a magnetic field to remove them and includes: a casing 20 having an introduction port 21 for introducing the particulates or fluid and a discharge port 23 for discharging the particulates or fluid; an annular magnetic member 30 which forms an annular shape and is rotatably supported through a rotary shaft 40 in an internal space R1 of the casing 20 and rotated in a predetermined direction by rotation means to attract the magnetic foreign matters to remove them; and a suction structure which suctions the magnetic foreign matters attracted and removed by the annular magnetic member 30 from the annular magnetic member 30 to remove them.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a magnetic foreign matter removal device for removing magnetic foreign matter from powder or granular material or fluid containing magnetic foreign matter by adsorption using a magnetic field. [Background technology]

[0002] For example, foreign matter must be strictly removed from powders and fluids used in food ingredients such as flour, and composite oxides used in batteries. Known devices for removing magnetic foreign matter from such powders and fluids include a casing into which the powder is placed and a magnet placed inside the casing. To increase the efficiency of magnetic foreign matter adsorption, a device that rotates a magnet inside the casing (rotary magnet device) has also been put into practical use.

[0003] In the above-mentioned rotary magnet device, magnetic foreign matter adheres to the magnet surface during use, reducing the adsorption efficiency. Therefore, it is necessary to periodically remove the magnetic foreign matter from the magnet surface and clean the magnet. In this case, the operation of the rotary magnet structure is stopped, the magnet is removed from the casing, and the magnet surface is cleaned to remove the magnetic foreign matter.

[0004] For example, Patent Document 1 listed below describes a magnetic powder removal device that includes a joint casing, a plurality of magnet bars that are evenly spaced around the circumference of the joint casing via a support disk and rotated by a drive source, a dust box that is connected to the joint casing, an air cylinder that draws the magnet bars into the dust box, and a scraper that scrapes magnetic powder from the surface of the magnet bars.

[0005] When removing the magnetic powder from the surface of the magnet bar, the drive source is turned off to stop the rotation of the magnet bar, and then the air cylinder is operated to pull the magnet bar into the dust box, during which time a scraper scrapes off the magnetic powder adhering to the surface of the magnet bar (see paragraphs 0034 and 0035 of Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-136785 Summary of the Invention [Problem to be solved by the invention]

[0007] In the removal device of Patent Document 1, when removing magnetic powder from the surface of the magnet bar, the drive source is turned off and the rotation of the magnet bar is temporarily stopped. As a result, the magnetic powder removal operation using the magnet bar is interrupted every time magnetic powder is removed from the surface of the magnet bar. In such cases, it is difficult to respond when magnetic foreign matter must be continuously removed from powder or granular materials over a long period of time (for example, in the field of electric vehicle batteries).

[0008] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a magnetic foreign matter removal device that can continuously remove magnetic foreign matter from powder or granular material or fluid containing magnetic foreign matter over a long period of time. [Means for solving the problem]

[0009] In order to achieve the above-mentioned object, the present invention provides a magnetic foreign matter removal device that uses a magnetic field to adsorb and remove magnetic foreign matter from powder or granular material or fluid containing the magnetic foreign matter, and is characterized by having 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 ring-shaped magnetic member that is rotatably supported in the internal space of the casing via a rotating shaft and rotates in a predetermined direction by a rotating means to adsorb and remove the magnetic foreign matter, and an suction structure that sucks and removes the magnetic foreign matter adsorbed and removed by the ring-shaped magnetic member from the ring-shaped magnetic member.

[0010] According to the above invention, when powder or fluid is introduced into the casing through the inlet, the annular magnetic member rotates by the rotating means, adsorbing and removing magnetic foreign matter from the powder or fluid, and the suction structure adsorbs and removes the magnetic foreign matter from the annular magnetic member, so that the magnetic foreign matter is adsorbed and removed from the powder or fluid containing magnetic foreign matter and the annular magnetic member is cleaned simultaneously.

[0011] As a result, even if the powder or fluid contains a high content of magnetic foreign matter, there is no need to interrupt the adsorption and removal work of the annular magnetic member in order to clean the annular magnetic member, and the adsorption and removal of magnetic foreign matter from the powder or fluid containing magnetic foreign matter can be carried out continuously and over a long period of time.

[0012] In the magnetic foreign matter remover of the present invention, the suction structure preferably has a hood that covers a predetermined radial position of the annular magnetic member, and suction means that sucks air from within the hood.

[0013] According to the above aspect, by covering a predetermined radial location of the annular magnetic member with a hood, the magnetic foreign matter adsorbed and removed by the annular magnetic member can be prevented from scattering, while the suction means that sucks in air inside the hood can efficiently suck the magnetic foreign matter from the annular magnetic member, allowing the cleaning work of the annular magnetic member to be performed quickly and appropriately with minimal missed cleaning areas.

[0014] In the magnetic foreign matter removal device of the present invention, it is preferable that the annular magnetic members are arranged in multiple numbers in the axial direction of the rotating shaft, and that the hood consists of multiple members each covering a predetermined radial position of each annular magnetic member.

[0015] According to the above aspect, since the plurality of annular magnetic members are arranged in the axial direction of the rotating shaft, even when a large amount of powder or fluid is introduced into the casing, magnetic foreign matter can be appropriately adsorbed and removed from the powder or fluid, thereby reducing the amount of magnetic foreign matter that is adsorbed and lost from the powder or fluid. Furthermore, since the hoods are made up of a plurality of annular magnetic members each covering a predetermined radial position of each annular magnetic member, magnetic foreign matter can be sucked and removed while suppressing scattering of each annular magnetic member, thereby ensuring the cleaning of each annular magnetic member. [Effects of the Invention]

[0016] According to the present invention, even if the powder or fluid contains a large amount of magnetic foreign matter, there is no need to interrupt the adsorption and removal work of the annular magnetic member in order to clean the annular magnetic member, and the adsorption and removal of magnetic foreign matter from the powder or fluid containing magnetic foreign matter can be carried out continuously and over a long period of time. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a perspective view showing a schematic configuration of an embodiment of a magnetic foreign matter removal device according to the present invention; [Figure 2] FIG. 2 is a front view illustrating a schematic configuration of the magnetic foreign matter removal device. [Figure 3] FIG. 2 is an enlarged plan view of a main part of the magnetic foreign matter removal device. [Figure 4] FIG. 2 is an exploded perspective view of an annular magnetic member constituting the magnetic foreign matter removal device. [Figure 5] FIG. 2 is a partially sectional plan view of the annular magnetic member. [Figure 6] FIG. 6 is a cross-sectional view taken along the line BB in FIG. 5. [Figure 7] FIG. 10 is a front view illustrating a schematic configuration of another embodiment of a magnetic foreign matter removal device according to the present invention. [Figure 8] FIG. 2 is a plan view illustrating the magnetic foreign matter removal device. [Figure 9] 3 is a cross-sectional view showing one embodiment of a magnetic member used in the magnetic foreign matter removal device. FIG. [Figure 10] FIG. 10 is a cross-sectional view taken along the line AA in FIG. 9. DETAILED DESCRIPTION OF THE INVENTION

[0018] (One embodiment of a magnetic foreign matter removal device) Hereinafter, one embodiment of a magnetic foreign matter remover according to the present invention will be described with reference to FIGS.

[0019] As shown in Figures 1 and 2, the magnetic foreign matter removal device 10 (hereinafter simply referred to as "removal device 10") in this embodiment uses a magnetic field to adsorb and remove magnetic foreign matter from powder or granular material or fluid containing magnetic foreign matter (hereinafter simply referred to as "powder or granular material, etc."), and includes a casing 20 having an inlet 21 for introducing powder or granular material or fluid and an outlet 23 for discharging the powder or granular material or fluid, an annular magnetic member 30 that is annular and rotatably supported in the internal space R1 of the casing 20 via a rotating shaft 40, and rotates in a predetermined direction by a rotating means not shown to adsorb and remove magnetic foreign matter, and an suction structure that sucks and removes the magnetic foreign matter adsorbed and removed by the annular magnetic member 30 from the annular magnetic member 30.

[0020] As shown in FIGS. 1 and 3, a plurality of annular magnetic members 30 are arranged in the axial direction of the rotary shaft 40.

[0021] First, to describe in detail the casing 20, the casing 20 in this embodiment is in the shape of a bottomed box having an internal space R1, with an inlet 21 provided on the upper ceiling surface side and an outlet 23 provided on the lower bottom surface side. The casing 20 has a pair of inner surfaces 20a, 20a that are parallel to each other.

[0022] Furthermore, a plurality of covers 45, 46 are provided on the inlet 21 side of the casing 20 so as to protrude inward of the casing. In this embodiment, the covers 45, 46 are generally triangular in shape, having a bottom surface 47 disposed perpendicular to the inner surface 20a of the casing 20 and a tapered surface 48 that gradually lowers the covers 45, 46 from the top of the casing diagonally downward.

[0023] The covers 45, 46 are components that cover from above the dead space between the pair of inner surfaces 20a, 20a of the casing 20 and the outer periphery of the annular magnetic member 30, where the magnetic field of the annular magnetic member 30 is difficult to reach and magnetic foreign matter is likely to be attracted and leak, thereby appropriately supplying powder and granular materials above the annular magnetic member 30. In addition, the tapered surfaces 48, 48 of the covers 45, 46 make it easier to guide (induce) the powder and granular materials above the annular magnetic member 30.

[0024] Next, the annular magnetic member 30 will be described in detail.

[0025] As shown in Figures 4 and 5, each annular magnetic member 30 has a wide, approximately annular (circular ring) magnet case 33 and a plurality of magnets 34 stored in the magnet case 33 with the same poles facing each other via a yoke 37.

[0026] As shown in FIG. 4, the magnet case 33 is made up of a pair of split cases 38, 38.

[0027] Each separate case 38 has an annular plate portion 38a that is larger than the maximum outer diameter of the rotating shaft 40 when viewed in the axial direction of the rotating shaft 40 (a direction along the axis C of the rotating shaft 40), and that has a generally annular plate shape in which the entire inner periphery (entire inner circumference) and the entire outer periphery (entire outer circumference) are both circular. Note that the above term "annular" means a shape that is continuous in the circumferential direction, that is, a shape that extends continuously in the circumferential direction without any divided or cut portions in the circumferential direction.

[0028] A shaft insertion hole 38b, through which the rotating shaft 40 is inserted, is formed in the radial center (inner peripheral edge) of the annular plate portion 38a. Furthermore, each annular plate portion 38a has an inner peripheral rib 38c that protrudes from the peripheral edge (inner peripheral edge) of the shaft insertion hole 38b toward the mating separate case 38, and an outer peripheral rib 38d that protrudes from the outer peripheral edge toward the mating separate case 38.

[0029] The inner peripheral ribs 38c, 38c and the outer peripheral ribs 38d, 38d of the pair of split cases 38, 38 are overlapped and fixed together to form a single magnet case 33 made up of the two split cases 38, 38.

[0030] The magnet case 33 of the annular magnetic member 30 is made of a non-magnetic material such as stainless steel (austenitic stainless steel) such as SUS304 or SUS316, an aluminum alloy, a titanium alloy, or a synthetic resin.

[0031] In addition, there are multiple magnets 34, and these multiple magnets 34 are stored in the magnet case 33 with the same poles facing each other via a yoke 37, and the multiple magnets 34 are arranged in a ring shape.

[0032] More specifically, in this embodiment, each magnet 34 is a rod-shaped permanent magnet that extends a predetermined length corresponding to the annular plate portion 38a, which has a wide, annular plate shape, as shown in Figures 4 and 6. As shown in Figure 6, each magnet 34 has both longitudinal ends that are rounded when viewed from the side, and as shown in Figure 4, the width direction perpendicular to the longitudinal direction is an approximately fan-shaped rod that is wide radially outward from the annular plate portion 38a and gradually narrows radially outward.

[0033] One end of the magnet 34 in the extension direction forms a north pole 35, and the other end in the extension direction forms a south pole 36. The magnet may have a substantially elliptical shape having a major axis and a minor axis when viewed from the side, and is not particularly limited.

[0034] Furthermore, the yoke 37 in this embodiment is a long plate with rounded R-shaped ends at both ends in the longitudinal direction, with a shape and length that fits the magnet 34, and is made of a metal such as pure iron or low-carbon steel.

[0035] 4 and 5, the plurality of magnets 34 are housed and arranged in the magnet case 33 with the north poles 35, 35 of adjacent magnets 34, 34 facing each other and a yoke 37 interposed between the north poles 35, 35, or with the south poles 36, 36 of adjacent magnets 34, 34 facing each other and a yoke 37 interposed between the south poles 36, 36. As a result, the plurality of magnets 34 are arranged in the magnet case 33 so as to form a ring.

[0036] Furthermore, by disposing the yoke 37 between adjacent magnets 34, 34 with the same poles, the magnetic force of the magnets 34 acts on the yoke 37, and the yoke 37 becomes a portion that attracts magnetic foreign matter.

[0037] Note that the bar-shaped magnets described in Japanese Patent Application No. 2018-20490 (Patent No. 6446631) filed by the present applicant may be used as each magnet 34. This is already publicly known and will not be described in detail, but this bar-shaped magnet has a major axis and a minor axis, extends in a rod-like shape of a predetermined length, and when viewed in a cross section perpendicular to the axial direction, has an attraction portion provided with a pair of attraction surfaces extending a predetermined length so as to be parallel to each other, and a guide portion provided on one end of the attraction portion and having a pair of inclined surfaces that gradually widen from one end of the major axis to the other, for guiding magnetic foreign matter to the attraction portion.

[0038] In addition, in this embodiment, when viewed in cross section (when viewed from the cross-sectional direction), the radial inner end and radial outer end of the magnet case 33 and magnet 34 both have a curved shape that is approximately arc-shaped.

[0039] However, the annular magnetic member is not limited to this form, and may have, for example, in a cross-sectional view, (1) a radially inner end portion having an approximately arc-shaped curved surface, and a radially outer end portion having an approximately triangular angular shape; (2) a radially inner end portion and a radially outer end portion both having approximately triangular angular shapes; (3) a radially inner end portion having a vertical surface shape along the thickness direction, and a radially outer end portion having an approximately triangular angular shape; (4) a radially inner end portion having a vertical surface shape along the thickness direction, and a radially outer end portion having an approximately arc-shaped curved surface; or (5) a radially inner end portion having an approximately triangular angular shape, and a radially outer end portion having an approximately arc-shaped curved surface.

[0040] Next, a support structure for the annular magnetic member 30 having the above-described structure relative to the casing 20 will be described.

[0041] That is, as shown in Fig. 1, bearings (not shown) are disposed on opposing wall portions of the casing 20, and the rotating shaft 40 is rotatably supported by the bearings. In this embodiment, the rotating shaft 40 is disposed horizontally. That is, the rotating shaft 40 is disposed perpendicular (orthogonal) to the direction in which the non-processed material, such as powder or granular material, is introduced into the internal space R1 of the casing 20 (see the downward arrow in Fig. 2). The rotating shaft 40 is rotated in a predetermined direction by a rotating means (not shown), such as a motor.

[0042] Furthermore, each annular magnetic member 30 is fixed to the rotary shaft 40 via a plurality of support arms 43 (which can also be called spokes).

[0043] Specifically, as shown in FIGS. 1 and 2, eight support arms 43 extend radially from predetermined axial positions on the outer periphery of the rotary shaft 40 at equal intervals relative to the axis C.

[0044] The eight support arms 43 are fixed to the inner periphery of the annular magnetic member 30. As a result, a plurality of the annular magnetic members 30 are arranged in the axial direction of the rotating shaft 40 (see FIG. 2).

[0045] Furthermore, when the rotating means is driven to rotate the rotating shaft 40, all of the annular magnetic members 30 rotate simultaneously in the same direction via the support arms 43.

[0046] Next, the suction structure (which can also be called a dust collection structure) that sucks and removes the magnetic foreign matter that has been attracted and removed by the annular magnetic member 30 from the annular magnetic member 30 will be described in detail.

[0047] This suction structure has a hood 50 that covers a predetermined radial position of the annular magnetic member 30 , and suction means 53 that sucks air from within the hood 50 .

[0048] 1, hood 50 is generally box-shaped and long enough to cover all of the multiple annular magnetic members 30, with an internal space R2 inside. Also referring to FIG. 3, hood 50 has a cylindrical duct 51 connected to suction means 53, and suction section 52 that gradually widens from the tip of duct 51 toward the hood tip and extends at a constant width from the widest point. The internal spaces of duct 51 and suction section 52 are connected to each other.

[0049] At the tip of the suction part 52, a plurality of suction ports 52a are formed in parallel along the width direction of the hood 50 (the same direction as the axial direction of the rotating shaft 40), each of which is a groove-like recess with a predetermined depth extending from the tip surface toward the duct side. A corresponding annular magnetic member 30 is accommodated in each suction port 52a.

[0050] Furthermore, suction means 53, such as a suction fan, is connected to the base side of the hood 50, i.e., the base end side of the duct 51 of the hood 50. The suction means 53 is also provided with a collection box (not shown) that collects magnetic foreign matter sucked in by the suction structure. When the suction means 53 operates, a suction force acts from each suction port 52a of the hood 50 into the internal space R2 of the hood 50 (see arrow F in FIG. 2).

[0051] Then, the suction force from the suction means 53 acts on the magnetic foreign matter attracted to the outer surface of the magnet case 33 of the annular magnetic member 30 via the hood 50. As a result, the magnetic foreign matter is sucked and removed from the annular magnetic member 30, and the sucked and removed magnetic foreign matter flows through the internal space R2 of the hood 50 (the internal space of the suction part 52 and the duct 51) and is then collected in a collection box (not shown) via the suction means 53.

[0052] The suction means 53 is set so that when the rotating shaft 40 rotates, its operation is turned ON and the suction operation is performed as described above, and when the rotation of the rotating shaft 40 stops, its operation is turned OFF and the suction operation stops. In other words, the suction means 53 turns ON / OFF in conjunction with the ON / OFF of the rotating shaft 40. However, the suction operation of the suction structure may of course be set to be performed at a fixed timing, without being linked to the rotation of the rotating shaft 40.

[0053] (Effects of magnetic foreign matter removal device) Next, the method of use and the effects of the removal device 10 having the above structure will be described.

[0054] That is, the operation of the rotation means and suction means 53 is turned ON to rotate the multiple annular magnetic members 30 in a predetermined direction and apply suction force from the suction structure to each annular magnetic member 30, and then powder or fluid (powder, etc.) containing magnetic foreign matter is introduced into the internal space R1 of the casing 20 through the inlet 21 of the casing 20.

[0055] As a result, magnetic foreign matter is attracted to and removed from the powder or granular material by the magnetic field of the rotating annular magnetic members 30. That is, the magnetic force of the magnets 34, 34 arranged adjacent to each other inside the magnet case 33 acts on the yoke 37, making the yoke 37 an attracting portion, and the portion of the magnet case 33 where the yoke 37 is located becomes an attracting surface, which attracts the magnetic foreign matter.

[0056] In addition, the suction force from the suction means 53 acts on the magnetic foreign matter attracted to the outer surface of the magnet case 33 of the annular magnetic member 30 via the hood 50, and the magnetic foreign matter is sucked and removed from the surface of the magnet case 33 of the annular magnetic member 30.

[0057] In the present invention, as described above, the annular magnetic member 30 is rotated by the rotating means to adsorb and remove magnetic foreign matter from powder and granular materials, etc., and the suction structure adsorbs and removes the magnetic foreign matter from the annular magnetic member 30, so that the adsorption and removal of magnetic foreign matter from powder and granular materials or fluids containing magnetic foreign matter and the cleaning of the annular magnetic member are carried out simultaneously.

[0058] As a result, even if the powder or fluid contains a large amount of magnetic foreign matter, there is no need to interrupt the adsorption and removal work of the annular magnetic member 30 in order to clean the annular magnetic members 30, 31, and the adsorption and removal of magnetic foreign matter from the powder or fluid containing magnetic foreign matter can be carried out continuously and over a long period of time.

[0059] In this embodiment, the suction structure includes a hood 50 that covers a predetermined radial position of the annular magnetic member 30, and suction means 53 that sucks air from within the hood 50.

[0060] According to the above embodiment, a predetermined radial location of the annular magnetic member 30 is covered with the hood 50, thereby preventing the scattering of magnetic foreign matter adsorbed and removed by the annular magnetic member 30, while the suction means 53 that sucks air inside the hood 50 can efficiently suck the magnetic foreign matter from the annular magnetic member 30, allowing the cleaning work of the annular magnetic member 30 to be performed quickly and appropriately with minimal missed cleaning areas.

[0061] Although the rotating shaft 40 in this embodiment is arranged horizontally, for example, the rotating shaft may be arranged at an angle to the introduction direction of the powdered or granular material (at an angle to the bottom surface of the casing 20), or the rotating shaft may be arranged at an angle when viewed from the planar direction of the casing 20. When the rotating shaft is arranged at an angle in this manner, one or more predetermined annular magnetic members out of the plurality of annular magnetic members can be arranged close to the introduction port 21 of the casing 20, thereby improving the contact efficiency between the annular magnetic member 30 and the powdered or granular material.

[0062] (Another embodiment of the magnetic foreign matter removal device) 7 to 10, another embodiment of the magnetic foreign matter remover according to the present invention will be described. Note that parts that are essentially the same as those in the above embodiment will be given the same reference numerals and their description will be omitted.

[0063] The magnetic foreign matter removal device 10A in this embodiment (hereinafter also referred to simply as "removal device 10A"), like the removal device 10, has a casing 20, an annular magnetic member that adsorbs and removes magnetic foreign matter, and an suction structure that sucks and removes the magnetic foreign matter adsorbed and removed by the annular magnetic member from the annular magnetic member.

[0064] In this embodiment, the annular magnetic member 30A has an annular (circular ring) shape, as shown in Fig. 7. Also, Fig. 9 shows a cross section of the annular magnetic member 30A perpendicular to the opening direction of the annular portion, and as shown in Fig. 9, each annular magnetic member 30A has a magnet case 33 and a plurality of magnets 34 housed in the magnet case 33 with like poles facing each other via a yoke 37.

[0065] 10 shows a cross section taken along the line AA in FIG. 9 (a cross section perpendicular to the direction in which the annular portion of the annular magnetic member 30A extends), in which the magnet case 33 has a wall portion with a cylindrical cross section of a constant thickness. The wall portion of the magnet case 33 is circular over the entire inner periphery (entire inner circumference) and the entire outer periphery (entire outer circumference). In other words, the wall portion of the magnet case 33 forms a continuous ring shape in the circumferential direction.

[0066] The annular magnet case 33 is formed, for example, by joining one end and the other end in the extension direction of one cylindrically extending wall constituent to each other, or by preparing a plurality of wall constituents each having a substantially arc shape, arranging the wall constituents in an annular shape, and joining adjacent ends in the circumferential direction to each other.

[0067] In addition, there are multiple magnets 34, and these multiple magnets 34 are stored in the magnet case 33 with the same poles facing each other via a yoke 37, and the multiple magnets 34 are arranged in a ring shape.

[0068] More specifically, in this embodiment, each magnet 34 is a permanent magnet in the shape of a cylinder (solid round bar) with a constant outer diameter and a predetermined length. One end of the magnet 34 in the extension direction forms a north pole 35, and the other end in the extension direction forms a south pole 36. In addition, in this embodiment, the yoke 37 is a plate-like body made of metal such as pure iron or low-carbon steel.

[0069] 9, the plurality of magnets 34 are housed and arranged in the magnet case 33 with the north poles 35, 35 of adjacent magnets 34, 34 facing each other and a yoke 37 interposed between the north poles 35, 35, or with the south poles 36, 36 of adjacent magnets 34, 34 facing each other and a yoke 37 interposed between the south poles 36, 36. As a result, the plurality of magnets 34 are arranged in the magnet case 33 so as to form a ring.

[0070] Furthermore, by disposing the yoke 37 between adjacent magnets 34, 34 with the same poles, the magnetic force of the magnets 34 acts on the yoke 37, and the yoke 37 becomes a portion that attracts magnetic foreign matter.

[0071] Next, the suction structure in this embodiment will be described in detail.

[0072] 7, the hoods 50A in this suction structure are composed of a plurality of hoods that respectively cover predetermined radial locations of the annular magnetic members 30A arranged in the axial direction of the rotating shaft 40. Specifically, each hood 50A has a base 55 that extends a predetermined length, and an extension 56 that bends obliquely and extends from the tip of the base 55 in the extension direction, and is tubular in shape with an internal space R2.

[0073] Furthermore, the hood 50A is generally cylindrical and surrounded by walls in the circumferential direction, and as shown in Figure 8, the tip of the extension portion 56 in the extension direction is provided with a pair of upper and lower magnetic member openings 56a, 56a that open in a direction intersecting the extension direction of the extension portion 56, and an arm gap 56b that is slit groove-shaped and opens in a direction intersecting the extension direction of the extension portion 56 and opens on the rotating shaft 40 side.

[0074] The circumferentially extending portion of the annular magnetic member 30A is inserted through the magnetic member openings 56a, 56a, and the support arm 43 of the annular magnetic member 30A is inserted through the arm gap 56b. As a result, the extension 56 of the hood 50A does not interfere with the rotational movement of the annular magnetic member 30A.

[0075] Furthermore, it is preferable that the shape, width, gap, layout, etc. of the magnetic member opening 56a and the arm gap 56b are configured so as not to suck in or to make it difficult to suck in powder or granular material or fluid within the casing 20 before the magnetic foreign matter is adsorbed by the annular magnetic member 30A.

[0076] When suction means 53 operates, a suction force acts within internal space R2 of hood 50A from the tip of extension 56 of hood 50A toward the base end of base 55 (see arrow F in FIGS. 7 and 8).

[0077] Then, the suction force from the suction means 53 acts on the magnetic foreign matter attracted to the outer surface of the magnet case 33 of the annular magnetic member 30A via the hood 50A. As a result, the magnetic foreign matter is sucked and removed from the annular magnetic member 30A, and the sucked and removed magnetic foreign matter flows through the extension portion 56 and base portion 55 of the hood 50A, and is then collected in a collection box (not shown) via the suction means 53.

[0078] Therefore, in this embodiment as well, the annular magnetic member 30A is rotated by the rotating means 41 to attract and remove magnetic foreign matter from powder or granular material, etc., while the suction structure attracts and removes the magnetic foreign matter from the annular magnetic members 30, 31, so that the attraction and removal of magnetic foreign matter from powder or granular material or fluid containing magnetic foreign matter and the cleaning of the annular magnetic member are performed simultaneously. As a result, even with powder or fluid containing a high content of magnetic foreign matter, there is no need to interrupt the attraction and removal operation of the annular magnetic members 30, 31 to clean them, and the attraction and removal of magnetic foreign matter from powder or fluid containing magnetic foreign matter can be performed continuously and over a long period of time.

[0079] In this embodiment, a plurality of annular magnetic members 30A are arranged in the axial direction of the rotary shaft 40, and the hoods 50 are made up of a plurality of members each covering a predetermined radial position of each annular magnetic member 30A.

[0080] According to the above aspect, since a plurality of annular magnetic members 30A are arranged in the axial direction of the rotating shaft 40, magnetic foreign matter can be appropriately adsorbed and removed from the powder and granular material, and the amount of magnetic foreign matter adsorbed and lost from the powder and granular material can be reduced, even when a large amount of powder and granular material is introduced into the casing 20. Furthermore, since the hood 50 is made up of a plurality of members each covering a predetermined radial position of each annular magnetic member 30A, magnetic foreign matter can be sucked and removed while suppressing scattering of each annular magnetic member 30A, thereby ensuring the cleaning of each annular magnetic member 30A.

[0081] Incidentally, the layout of the annular magnetic members may be such that, for example, two types of annular magnetic portions with different outer diameters are employed, and these annular magnetic members are arranged to form multiple annular rings (double annular rings) when viewed from the axial direction of the rotating shaft 40 (see Figure 5), and multiple annular magnetic members are arranged in the axial direction of the rotating shaft 40.

[0082] In the above embodiment, the number of annular magnetic members arranged in the internal space R1 of the casing 20 can be further increased, so that even when a large amount of powder or granular material is introduced into the casing 20, magnetic foreign matter can be properly adsorbed and removed from the powder or granular material, thereby more effectively reducing the amount of magnetic foreign matter that is adsorbed and leaks from the powder or granular material.

[0083] (Modification of magnetic foreign matter removal device) The structure and shape of the magnetic foreign matter remover of the present invention, and the shapes and structures of the casing and magnetic members that make up the magnetic foreign matter remover, are not limited to the above-described embodiments.

[0084] For example, three types of annular magnetic members with different diameters may be arranged to form a triple annular shape when viewed from the axial direction, or four or more types of annular magnetic members may be arranged to form a multiple annular shape.

[0085] The number of annular magnetic members arranged in the axial direction may be two, three, or more than three, or only one.

[0086] Furthermore, although the annular magnetic member 30 in the embodiment shown in Figures 1 to 6 has eight support arms 43, and the annular magnetic member 30A in the embodiment shown in Figures 7 to 10 has four support arms 43, the number of support arms may be, for example, two, three, five or more.

[0087] Furthermore, the location of the attraction structure need not be limited to one location in the radial direction of each annular magnetic member, but may be multiple locations in the radial direction of the annular magnetic member.

[0088] It should be noted that the present invention is not limited to the above-described embodiment, 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 symbols]

[0089] 10,10A Magnetic foreign matter removal device (removal device) 20 Casing 21 Introduction 23 Outlet 30,30A Annular magnetic member 40 Rotational Axis 41 Rotation means 43 Support arm 50,50A Hood 53 Suction means

Claims

1. A magnetic foreign matter removal device that uses a magnetic field to adsorb and remove magnetic foreign matter from powder or granular material or a fluid containing the magnetic foreign matter, 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; an annular magnetic member that is annular, rotatably supported in the internal space of the casing via a rotation shaft, and rotated in a predetermined direction by a rotation means to attract and remove the magnetic foreign matter; a suction structure that sucks the magnetic foreign matter attracted and removed by the annular magnetic member away from the annular magnetic member and removes it.

2. 2. A magnetic foreign matter remover according to claim 1, wherein said suction structure comprises a hood covering a predetermined radial position of said annular magnetic member, and suction means for sucking air from within said hood.

3. a plurality of the annular magnetic members are arranged in the axial direction of the rotating shaft, 4. A magnetic foreign matter remover according to claim 2, wherein said hoods are made up of a plurality of hoods each covering a predetermined radial position of each annular magnetic member.

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