Excitation / demagnetization device and magnetic foreign matter removal device

Abstract

To provide a magnetization / demagnetization device that can save a space and is suitable for a magnetic foreign matter removal device.SOLUTION: A magnetization / demagnetization device includes a first member of which adsorption surface is disposed in a flow channel through which powder contaminated with a magnetic foreign matter flows; a magnet body disposed on an opposite side to a side, on which the adsorption surface is oriented when being viewed from the first member, so as to be movable in a first direction in which an interval to the adsorption surface varies; and a movement mechanism for moving the magnet body in the first direction with inflow and outflow of a fluid.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an exciting / demagnetizing device and a magnetic foreign matter removing device. [Background technology]

[0002] A removal device that uses a permanent magnet to remove magnetic foreign matter from raw materials is known. The following Patent Document 1 discloses a removal device in which a cylindrical magnetic material attractor is arranged in a vertical raw material supply path. In this removal device, the magnetic material attractor is inserted obliquely downward from the side of a cylindrical member that defines the raw material supply path. The magnetic material attractor includes a stainless steel outer sleeve and a permanent magnet inserted therein.

[0003] When performing cleaning work to remove magnetic foreign matter adsorbed to the magnetic material absorber, the magnet is pulled out from the outer sleeve, causing the magnetic foreign matter adsorbed to the outer sleeve to fall off. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2006-61834 A Summary of the Invention [Problem to be solved by the invention]

[0005] There is a demand for space-saving magnetic foreign matter removal devices. When cleaning conventional magnetic foreign matter removal devices, the magnet needs to be pulled out from the outer sleeve, so extra space must be secured on the side of the raw material supply path to pull out the magnet. This makes it difficult to reduce the space required for the magnetic foreign matter removal device.

[0006] An object of the present invention is to provide an excitation / demagnetization device suitable for a magnetic foreign matter removal device that can reduce space, and a magnetic foreign matter removal device. [Means for solving the problem]

[0007] According to one aspect of the present invention, a first member having an adsorption surface disposed in a flow path through which the powder containing magnetic foreign matter flows; a magnet body arranged on an opposite side to a side to which the attraction surface faces as viewed from the first member, the magnet body being movable in a first direction in which a distance between the magnet body and the attraction surface changes; a moving mechanism that moves the magnetic body in the first direction by inflow and outflow of a fluid; Equipped with 、 The moving mechanism includes a flexible sheet-like member that is deformed by an inflow of a fluid, and the sheet-like member is deformed in response to the inflow or outflow of the fluid to move the magnetic body in the first direction. A magneto-demagnetizing device is provided.

[0008] According to another aspect of the invention, The above-mentioned excitation / demagnetization device; A cylindrical member that defines the flow path through which the powder containing magnetic foreign matter flows; A magnetic foreign matter removal device comprising: The magnetic foreign matter removal device is provided such that the magnetizing / demagnetizing device is disposed in the flow path with the attraction surface facing the upstream side of the flow in the flow path and inclined with respect to the direction of the flow. Effect of the Invention

[0009] By narrowing the gap between the magnet body and the attraction surface of the first member, magnetic foreign matter can be attracted to the attraction surface.

[0010] By widening the gap between the magnet body and the attraction surface of the first member, the magnetic foreign matter attracted to the attraction surface can be removed from the attraction surface. Compared to a configuration in which the magnet body is moved in the in-plane direction of the attraction surface to eliminate the attraction force, this has the excellent effect of eliminating the need to secure space for moving the magnet body in the in-plane direction. This makes it possible to save space. [Brief description of the drawings]

[0011] [Figure 1] 1A and 1B are cross-sectional views of an excitation / demagnetization device according to one embodiment. [Diagram 2]FIG. 2A is a diagram showing the arrangement of each component of a magnetic foreign matter remover according to another embodiment in a plan view, and FIG. 2B is a cross-sectional view taken along dashed line 2B-2B in FIG. 2A. [Diagram 3] FIG. 3 is a schematic cross-sectional view of the magnetic foreign matter remover during a removing operation for removing magnetic foreign matter from raw materials. [Figure 4] FIG. 4 is a cross-sectional view of the magnetic foreign matter remover during a cleaning operation. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] An exciting demagnetization device according to an embodiment of the present invention will be described with reference to Figures 1A and 1B. Figures 1A and 1B are cross-sectional views of an exciting demagnetization device 10 according to this embodiment. The exciting demagnetization device 10 according to this embodiment includes a plate-shaped first member 11, a plate-shaped magnet body 12, a moving mechanism 20, and a support member 26. The magnet body 12 is disposed substantially parallel to the first member 11 and capable of ascending and descending in a direction in which the distance between the magnet body 12 and the first member 11 changes (first direction D1). Of both surfaces of the first member 11, the surface opposite to the surface facing the magnet body 12 is referred to as an attraction surface 11A.

[0013] The first direction D1 is not necessarily parallel to the vertical direction (gravity direction) and may be oblique to the vertical direction. In other words, "able to move up and down" does not necessarily mean moving in the vertical direction (gravity direction). Depending on the posture of the excitation / demagnetization device 10, it may move in a direction oblique to the vertical direction, and the state in which it is possible to move in a diagonal direction is also included in "able to move up and down". Hereinafter, the direction in which the magnet body 12 approaches the first member 11 is referred to as "upward". FIG. 1A shows a state in which the magnet body 12 has risen to the top of its movable range, and FIG. 1B shows a state in which the magnet body 12 has descended to the bottom of its movable range.

[0014] The first member 11 is supported by the support member 26 such that the first member 11 closes the opening of the box-shaped support member 26 having an opening at the top. The first member 11 is made of, for example, stainless steel, and the support member 26 is made of, for example, resin or metal, such as iron. The support member 26 has a bottom 26A at a position spaced apart from the first member 11. A side wall 26B rises from the periphery of the bottom 26A, and the first member 11 is fixed to the upper end of the side wall 26B.

[0015] The magnetic body 12 is disposed between the first member 11 and a bottom portion 26A and is substantially parallel to the first member 11. The magnetic body 12 includes a plurality of permanent magnets 12A arranged two-dimensionally. The position of the magnetic body 12 in a direction perpendicular to the first direction D1 is constrained by a side wall 26B of the support member 26, and the magnetic body 12 is guided in the first direction D1 relative to the first member 11.

[0016] The moving mechanism 20 moves the magnet body 12 in the first direction D1. The moving mechanism 20 includes a mounting plate 22 and a flexible sheet-like member 21. For example, canvas is used for the sheet-like member 21. The sheet-like member 21 is attached to the mounting plate 22 at almost the entire circumference of its edge. For example, the annular member 23 is fixed to the mounting plate 22 by a screw 24 while the edge of the sheet-like member 21 is sandwiched between the annular member 23 and the mounting plate 22. The deformation of the sheet-like member 21 changes the volume of the space between the mounting plate 22 and the sheet-like member 21. The space between the mounting plate 22 and the sheet-like member 21 is referred to as a volume variable space 25. The volume variable space 25 is located between the magnet body 12 and the bottom 26A.

[0017] An inlet / outlet port 31 opens into the volume variable space 25. An opening having a size corresponding to the movement range of the magnetic body 12 is provided in the side wall 26B. In Figures 1A and 1B, the portion corresponding to this opening is indicated by a dashed line. The inlet / outlet port 31 is led out to the outside of the support member 26 through this opening.

[0018] The outflow / inflow inlet 31 is connected to an air supply / discharge device 30 via an air tube 32. The air supply / discharge device 30 has the function of allowing air to flow into the volume variable space 25 from the outflow / inlet 31, or allowing air to flow out of the volume variable space 25 through the outflow / inlet 31. When air is allowed to flow into the volume variable space 25, the volume of the volume variable space 25 increases, and the magnetic body 12 rises (FIG. 1A). When air is allowed to flow out of the volume variable space 25, the volume of the volume variable space 25 decreases, and the magnetic body 12 descends (FIG. 1B).

[0019] Next, the operation of the excitation / demagnetization device 10 according to this embodiment will be described. When air is introduced into the volume variable space 25 to raise the magnetic body 12, the magnetic body 12 comes into contact with the first member 11, or the gap between the first member 11 and the magnetic body 12 narrows, as shown in Fig. 1A. In this state, the magnetic foreign matter is attracted to the attraction surface 11A of the first member 11 by the magnetic force. This state is referred to as the excited state.

[0020] When air is discharged from the volume variable space 25, as shown in FIG. 1B, the magnet body 12 descends due to gravity, and the gap between the first member 11 and the magnet body 12 widens. As a result, the attraction force of the magnetic foreign matter on the attraction surface 11A of the first member 11 disappears. This state is referred to as a demagnetized state. If the attraction surface 11A is inclined with respect to the direction of gravity, when the excitation demagnetization device 10 is in the demagnetized state, the magnetic foreign matter that was attracted to the attraction surface 11A falls from the attraction surface 11A due to gravity. If a magnetic material such as iron is used for the support member 26, leakage of magnetic flux to the outside of the support member 26 is suppressed. Therefore, an excellent effect is obtained in that the fallen magnetic foreign matter 50 is less likely to reattach to the support member 26.

[0021] Next, the excellent effects of this embodiment will be described. In this embodiment, magnetic foreign matter is attracted to the attracting surface 11A of the flat plate-shaped first member 11, so the area of ​​the attracting surface 11A that exerts the attracting action is larger than that of a configuration in which magnetic foreign matter is attracted by a rod-shaped magnetic material attracting body. As a result, the processing ability for removing magnetic foreign matter from raw materials is improved. In addition, by devising the arrangement of the multiple permanent magnets 12A arranged on the flat plate-shaped magnetic body 12, the magnetic flux density on the attracting surface 11A can be increased.

[0022] In this embodiment, the magnet body 12 is moved in a first direction D1 perpendicular to the attraction surface 11A to switch between the excited state and the demagnetized state. The moving distance of the magnet body 12 is shorter than in a configuration in which the magnet body 12 is pulled out in a direction parallel to the attraction surface 11A to switch between the excited state and the demagnetized state. Therefore, the magnet body 12 can be quickly switched between the excited state and the demagnetized state. Furthermore, since there is no need to secure a space for pulling out the magnet body 12, space can be saved.

[0023] In this embodiment, the magnetic body 12 is moved in the first direction D1 by the inflow and outflow of air, so there is no need to place a power source, such as a motor, for moving the magnetic body 12 inside the exciting / demagnetizing device 10. This makes it possible to reduce the size of the exciting / demagnetizing device 10.

[0024] Next, a modification of the above embodiment will be described. In the above embodiment, the volume variable space 25 is defined by using the flexible sheet-like member 21 in the moving mechanism 20, but the volume variable space 25 may be defined by other configurations. For example, an air cylinder or the like may be used in the moving mechanism 20. Also, in the above embodiment, air is caused to flow into the volume variable space 25, but other fluids may be caused to flow therein. For example, gas other than air, or liquid such as water may be caused to flow therein.

[0025] In the above embodiment, the suction surface 11A of the first member 11 is a flat surface, but the suction surface 11A does not necessarily have to be a geometrically accurate flat surface. For example, the suction surface 11A may be a smoothly curved surface.

[0026] Next, a magnetic foreign matter removal device according to another embodiment will be described with reference to Figures 2 to 4. The magnetic foreign matter removal device according to this embodiment is equipped with a plurality of, for example, three, excitation / demagnetization devices 10 according to the embodiment shown in Figures 1A and 1B.

[0027] Fig. 2A is a diagram showing the arrangement of each component of the magnetic foreign matter remover according to this embodiment in a plan view, and Fig. 2B is a cross-sectional view taken along dashed line 2B-2B in Fig. 2A. A cylindrical member 40, for example a cylindrical member, is arranged so that its central axis 41 is parallel to the vertical direction. Inside the cylindrical member 40, a flow path is defined through which raw material containing magnetic foreign matter, for example powder, flows downward. Three excitation / demagnetization devices 10 are arranged in this flow path with their attraction surfaces 11A facing diagonally upward.

[0028] More specifically, the adsorption surface 11A is inserted from the side surface of the cylindrical member 40 into the flow path at an inclination such that the adsorption surface 11A becomes lower from the side surface toward the central axis 41. The inclination angle is, for example, 45°. The three exciting / demagnetizing devices 10 are arranged at different positions relative to each other in the height direction, and are also arranged at different positions relative to the circumferential direction of the cylindrical member 40. The insertion points of the three exciting / demagnetizing devices 10 are arranged at equal intervals in the circumferential direction. The adsorption surface 11A is inserted at least up to the central axis 41 of the cylindrical member 40.

[0029] 3 and 4 are schematic cross-sectional views of the magnetic foreign matter remover according to the present embodiment. Fig. 3 shows a state during a removing operation for removing magnetic foreign matter from raw materials, and Fig. 4 shows a state during a cleaning operation of the magnetic foreign matter remover.

[0030] The control device 42 controls the air supply and discharge device 30 to switch the excitation / demagnetization device 10 between an excited state and a demagnetized state. A two-way switching valve 45 is attached to the lower end of the cylindrical member 40. The two-way switching valve 45 is controlled by the control device 42 to switch the outlet for the raw materials and magnetic foreign matter that have fallen through the flow path in the cylindrical member 40 between a first outlet 46A and a second outlet 46B.

[0031] During the removal operation (FIG. 3), the magnet body 12 rises obliquely upward, each exciting / demagnetizing device 10 is in an excited state, and the outlet of the two-way switching valve 45 is switched to the first outlet 46A. When raw materials are fed into the path from the upper end of the cylindrical member 40, magnetic foreign matter 50 in the raw materials is attracted to the attraction surface 11A of the exciting / demagnetizing device 10. The raw materials are discharged from the first outlet 46A, as shown by the arrow in FIG. 3.

[0032] During the cleaning operation (FIG. 4), the magnet body 12 descends obliquely downward, each excitation / demagnetization device 10 is demagnetized, and the outlet of the two-way switching valve 45 is switched to the second outlet 46B. The magnetic foreign matter 50 that has been attracted to the attraction surface 11A falls from the attraction surface 11A and is discharged from the second outlet 46B.

[0033] Next, the excellent effects of the above embodiment will be described. In the above embodiment, the magnetic body 12 is not pulled out to the side of the cylindrical member 40 during the cleaning operation (FIG. 4). This allows for space saving compared to a configuration in which the magnetic body 12 is pulled out to the side of the cylindrical member 40 to achieve a demagnetized state. In addition, the control device 42 controls the air supply and discharge device 30 and the two-way switching valve 45 to switch between the removal operation and the cleaning operation, so that the cleaning work can be performed automatically without manual intervention.

[0034] Next, a modification of the above embodiment will be described. 1A and 1B, the mounting plate 22 of the moving mechanism 20 is disposed on the magnet body 12 side, and the sheet-like member 21 is disposed on the bottom 26A side, but the moving mechanism 20 may be turned upside down. That is, the mounting plate 22 may be disposed on the bottom 26A side, and the sheet-like member 21 may be disposed on the magnet body 12 side. The bottom 26A of the support member 26 may be used as the mounting plate 22. In this configuration, the inlet / outlet 31 may be attached to the bottom 26A.

[0035] In the above embodiment, the magnetic body 12 descends due to gravity when air is discharged from the volume variable space 25, but the magnetic body 12 may descend due to the restoring force of an elastic member such as a leaf spring or a coil spring. In this case, when air is introduced into the volume variable space 25, the elastic member is elastically deformed in response to the rise of the magnetic body 12.

[0036] In the above embodiment, during the cleaning operation shown in Fig. 4, the magnetic foreign matter 50 attracted to the attraction surface 11A falls naturally due to gravity, thereby cleaning the attraction surface 11A. During the cleaning operation, air may be blown onto the attraction surface 11A to remove the magnetic foreign matter 50 from the attraction surface 11A. Furthermore, air may also be blown onto locations other than the attraction surface 11A of the excitation / demagnetization device 10. This makes it possible to remove powder and the like adhering to the excitation / demagnetization device 10.

[0037] In the above embodiment, the cylindrical member 40 is cylindrical, but may be other shapes. For example, the planar cross section of the path defined by the cylindrical member 40 may be an ellipse, a polygon, a polygon with rounded corners, or the like. In this case, the central axis 41 (FIG. 2B) of the cylindrical member 40 may be considered as the geometric center of the planar cross section of the path defined by the cylindrical member 40.

[0038] In the above embodiment, the central axis 41 (FIG. 2B) of the cylindrical member 40 is parallel to the vertical direction, and the powder is made to flow downwards using gravity to remove magnetic foreign matter. As another configuration, the central axis 41 may be arranged at an angle to the vertical direction. Furthermore, the central axis 41 may be arranged horizontally. In this case, since gravity cannot be used to form the flow of powder, a flow of gas (e.g., air) is forcibly formed and the powder is made to flow together with the gas.

[0039] The above-mentioned embodiments are merely examples, and it goes without saying that partial replacement or combination of the configurations shown in different embodiments is possible. Similar effects due to similar configurations of multiple embodiments are not mentioned in each embodiment. Furthermore, the present invention is not limited to the above-mentioned embodiments. For example, it will be obvious to those skilled in the art that various modifications, improvements, combinations, etc. are possible. [Explanation of symbols]

[0040] 10 Excitation demagnetization device 11 First member 11A Adsorption surface 12 Magnet body 12A permanent magnet 20 Moving mechanism 21 Sheet-like materials 22 Mounting plate 23 Annular member 24 Screws 25 Variable volume space 26 Support member 26A Bottom of support member 26B Side wall of support member 30 Air supply and exhaust device 31 Inlet / Outlet 32 Air tube 40 Cylindrical member 41 Center axis 42 Control device 45 Two-way valve 46A 2-way valve No. 1 outlet 46B 2-way valve 2nd outlet 50 Magnetic foreign matter

Claims

1. a first member having an adsorption surface disposed in a flow path through which the powder containing magnetic foreign matter flows; a magnet body arranged on an opposite side to a side to which the attraction surface faces as viewed from the first member, the magnet body being movable in a first direction in which a distance between the magnet body and the attraction surface changes; a moving mechanism that moves the magnetic body in the first direction by inflow and outflow of a fluid; Equipped with The moving mechanism includes a flexible sheet-like member that deforms in response to the inflow of fluid, and the sheet-like member deforms in response to the inflow or outflow of fluid, thereby moving the magnetic body in the first direction.

2. 2. The magnetizing / demagnetizing device according to claim 1, wherein the attraction surface is flat and the first member is plate-shaped.

3. a support member supporting the first member and having a bottom spaced apart from the first member; the magnetic body is disposed between the first member and the bottom portion, The sheet-like member defines a volume variable space whose volume changes depending on the inflow and outflow of a fluid, 3. The excitation / demagnetization device according to claim 1, wherein the volume variable space is disposed between the bottom and the magnet body.

4. a first member having an adsorption surface disposed in a flow path through which the powder containing magnetic foreign matter flows; a magnet body arranged on an opposite side to a side to which the attraction surface faces as viewed from the first member, the magnet body being movable in a first direction in which a distance between the magnet body and the attraction surface changes; a moving mechanism that moves the magnetic body in the first direction by inflow and outflow of a fluid; a support member supporting the first member and having a bottom spaced apart from the first member; Equipped with the magnetic body is disposed between the first member and the bottom portion, the moving mechanism includes a flexible sheet-like member that is deformed by an inflow of a fluid, and defines a volume variable space between the sheet-like member and the magnet body or between the sheet-like member and the bottom, the volume of which changes with the inflow and outflow of a fluid; The variable volume space is disposed between the bottom and the magnet body.

5. The excitation / demagnetization device according to any one of claims 1 to 4, A cylindrical member that defines the flow path through which the powder containing magnetic foreign matter flows; A magnetic foreign matter removal device comprising: The excitation demagnetization device is a magnetic foreign matter removal device that is disposed within the flow path with the attraction surface facing upstream of the flow in the flow path and inclined relative to the direction of the flow.

6. a plurality of the excitation / demagnetization devices are arranged, and each of the plurality of excitation / demagnetization devices is inserted into the flow path from a side surface of the cylindrical member, 6. The magnetic foreign matter removal device according to claim 5, wherein the plurality of excitation / demagnetization devices are disposed at different positions with respect to the flow direction of the flow passage and the circumferential direction of the cylindrical member.

7. 7. The magnetic foreign matter remover according to claim 6, wherein the excitation / demagnetization device is inserted at least up to a central axis of the cylindrical member.

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