Magnetic foreign matter separation device and magnetic foreign matter separation system

Abstract

To provide a magnetic foreign matter separation device having a flow channel in which powder is less likely to deposit.SOLUTION: In a magnetic foreign matter separation device, a cylindrical member defines a flow channel through which powder contaminated with magnetic foreign matters flows. A plurality of linear members made of a soft magnetic material is disposed in the flow channel along a flow direction of powder. An electromagnetic field generator generates a magnetic field in the flow channel.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a magnetic foreign matter separation device and a magnetic foreign matter separation system. [Background technology]

[0002] A magnetic foreign matter separation device that separates magnetic foreign matter from a fluid is disclosed in the following Patent Document 1. This magnetic foreign matter separation device uses a magnetic filter configured by overlapping multiple wire meshes woven with ferromagnetic fine wires. When the magnetic filter is placed in the passage of the fluid to be treated and a magnetic field is generated in the passage of the fluid to be treated by an excitation coil, the wire mesh is magnetized and the magnetic foreign matter is attracted to the wire mesh. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 59-49044 Summary of the Invention [Problem to be solved by the invention]

[0004] When using a conventional magnetic foreign matter separation device to separate magnetic foreign matter mixed in powder, the powder is passed through a passage in which multiple wire meshes are arranged. During this process, powder accumulates at the intersections of the fine wires that make up the wire meshes. When powder accumulates, the flow of the powder is impeded and may eventually cause clogging. If the mesh of the wire mesh is made coarse to reduce the amount of accumulated powder, the separation ability of the magnetic foreign matter decreases. In order to remove the powder accumulated on the wire mesh, it becomes necessary to take measures such as installing a mechanism to vibrate the wire mesh.

[0005] An object of the present invention is to provide a magnetic foreign matter separation device in which powder is less likely to accumulate in a flow path. Another object of the present invention is to provide a magnetic foreign matter recovery system using the magnetic foreign matter recovery device. [Means for solving the problem]

[0006] According to one aspect of the present invention, A cylindrical member that defines a flow path through which the powder containing the magnetic foreign matter flows; a plurality of linear members made of a soft magnetic material arranged in the flow path along a flow direction of the powder; an electromagnetic field generator that generates a magnetic field in the flow path; 、 a first cover member that closes one opening of the cylindrical member; a second cover member that closes the other opening of the cylindrical member and is disposed at an angle with respect to the flow direction of the powder; Equipped with 、 Both ends of the plurality of linear members are attached to the first cover member and the second cover member, respectively. A magnetic foreign body separator is provided.

[0007] According to another aspect of the invention, The plurality of magnetic foreign matter separation devices; a branch flow path for selecting a part of the magnetic foreign matter separation devices from the plurality of magnetic foreign matter separation devices and supplying the powder to the flow path of the selected magnetic foreign matter separation device; a two-way valve connected to the flow path of each of the plurality of magnetic foreign matter separation devices and configured to direct the powder discharged from each of the plurality of magnetic foreign matter separation devices to one of a first flow path and a second flow path; A magnetic foreign body separation system is provided. Effect of the Invention

[0008] Since the linear members are arranged along the flow direction of the powder, the powder and the like are unlikely to accumulate on the linear members. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram of a magnetic foreign matter recovery device according to this embodiment. [Diagram 2] FIG. 2 is a plan cross-sectional view of a cylindrical member and a plurality of linear members of the magnetic foreign matter separator according to the present embodiment. [Diagram 3] 3A to 3C are perspective views of a portion of one linear member. [Figure 4]4A and 4B are side views of a linear member used in a magnetic foreign matter separating device according to a modified example of the above embodiment. [Diagram 5] FIG. 5 is a schematic diagram of a magnetic foreign matter separation device according to still another modified example. [Figure 6] FIG. 6 is a schematic diagram of a magnetic foreign matter separation system according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] A magnetic foreign matter recovery device according to one embodiment will be described with reference to FIGS. 1 to 3C. 1 is a schematic diagram of a magnetic foreign matter recovery device according to this embodiment. A cylindrical member 10 defines a flow path 11. Powder containing magnetic foreign matter is fed into the flow path 11 from an inlet 16, flows through the flow path 11, and is discharged from an outlet 17. For example, the cylindrical member 10 is used in a position in which its axial direction is parallel to the direction of gravity, and the outlet 17 is provided at a lower position than the inlet 16.

[0011] The upper opening of the cylindrical member 10 is closed by a first cover member 12, and the lower opening is closed by a second cover member 13. The second cover member 13 is disposed at an angle with respect to the direction of gravity. An outlet 17 is provided on the side surface of the cylindrical member 10 corresponding to the lowest point of the second cover member 13. The inlet 16 is provided on the side surface opposite the outlet 17 across the central axis of the cylindrical member 10. The powder is input into the flow path 11 of the cylindrical member 10 from its side. The powder that has flowed through the flow path 11 is discharged to the side of the cylindrical member 10 from the point of the second cover member 13 located most downstream in the powder flow direction.

[0012] A plurality of linear members 15 made of a soft magnetic material are arranged in the flow path 11 along the direction of the powder flow. The upper end of each of the linear members 15 is attached to the first cover member 12 via a tension adjustment bolt 14, and the lower end is attached to the second cover member 13. The tension adjustment bolt 14 makes it possible to adjust the tension applied to the linear members 15. A portion of the powder introduced from the introduction port 16 collides with the side surfaces of the plurality of linear members 15 and then falls through the flow path 11.

[0013] The electromagnetic field generator 20 generates a magnetic field in the flow path 11. The electromagnetic field generator 20 includes, for example, a coil, and generates a magnetic field in the flow path 11 by passing a current through the coil. The direction of the magnetic field generated in the flow path 11 is roughly perpendicular to the flow direction of the powder (the length direction of the linear member 15). The linear member 15 is magnetized by the magnetic field generated in the flow path 11. Magnetic foreign matter flowing through the flow path 11 is attracted to the magnetized linear member 15, and the magnetic foreign matter is separated from the powder.

[0014] 2 is a plan cross-sectional view of a tubular member 10 and a plurality of linear members 15. A flow path 11 having a circular cross section is defined by the tubular member 10. Note that the cross section of the flow path 11 does not necessarily have to be circular. A plurality of linear members 15 are arranged within the flow path 11. For example, in the plan cross section, a plurality of linear members 15 are arranged in the vertical and horizontal directions.

[0015] The diameter of the linear member 15 is denoted as D, and the distance between two adjacent linear members 15 in the vertical or horizontal direction is denoted as G. As an example, multiple linear members 15 are arranged so that the distance G is 10 times or more the diameter D.

[0016] 3A to 3C are perspective views of a portion cut out from one linear member 15. The cross sections of the linear member 15 shown in FIGS. 3A to 3C are a circle, a square, and a square with rounded corners, respectively. Any of the cross-sectional shapes shown in FIGS. 3A to 3C may be used as the linear member 15. Note that, instead of the linear member 15 having a square cross section shown in FIG. 3B, a linear member having a rectangular cross section or another convex polygon cross section may be used. Similarly, instead of the linear member 15 having a square cross section shown in FIG. 3C, a linear member having a rectangular cross section or another convex polygon cross section with rounded corners may be used.

[0017] The direction of magnetization of the linear member 15 depends on the direction of the externally applied magnetic field. If the cross section of the linear member 15 is a convex polygon or a rounded convex polygon, the magnetic field concentrates at the corners, and magnetic foreign matter is attracted to the corners of the linear member 15 and their vicinity.

[0018] Next, the excellent effects of the above embodiment will be described. When a wire mesh is placed in the powder flow path and magnetized, the powder tends to accumulate, especially at the points where the metal wires that make up the wire mesh intersect. If the mesh size of the wire mesh is made coarse in order to prevent the powder from accumulating, the ability to collect magnetic foreign matter decreases.

[0019] In contrast, in the above embodiment, the linear members 15 are arranged along the powder flow direction, so that powder is less likely to accumulate on the surface of the linear members 15. This makes it possible to narrow the interval G (FIG. 2) between the linear members 15 without being restricted by the accumulation of powder. By optimizing the diameter D and interval G of the linear members 15 (FIG. 2), the ability to collect magnetic foreign matter can be improved. This can improve the quality of the powder product.

[0020] In a configuration in which a wire mesh is placed in the powder flow path, if the powder accumulates on the wire mesh, the powder becomes difficult to flow and the processing capacity decreases. In the above embodiment, the powder does not easily accumulate on the linear member 15, so a high processing capacity can be maintained.

[0021] Next, magnetic foreign matter separating devices according to various modifications of the above embodiment will be described with reference to FIGS. 4A to 5. FIG.

[0022] Fig. 4A is a side view of a linear member 15 used in a magnetic foreign matter separation device according to a modified example of the embodiment. The linear member 15 used in the magnetic foreign matter separation device according to the embodiment (Fig. 1) is straight. In contrast, in the modified example shown in Fig. 4A, the linear member 15 is shaped like a wavy line. By making the linear member 15 wavy, the surface area of ​​the linear member 15 per unit length in the powder flow direction is increased, and the magnetic foreign matter flowing through the flow path 11 (Fig. 1) has more opportunities to come into contact with the linear member 15. This improves the ability to separate magnetic foreign matter.

[0023] FIG. 4B is a side view of the linear member 15 used in a magnetic foreign matter separation device according to another modified example. In this modified example, a portion of the linear member 15 is wavy, and the other portion is straight. In this manner, only a portion of the linear member 15 may be wavy. For example, the region located on the upstream side of the flow path 11 (FIG. 1) may be wavy. With this configuration, the recovery capability of magnetic foreign matter can be improved on the upstream side. Also, on the downstream side, the linear member 15 is straight, so that the powder flows easily. Therefore, compared to a configuration in which the entire linear member 15 is wavy, the flow of the powder is less likely to be impeded, and a decrease in processing capability can be suppressed.

[0024] 5 is a schematic diagram of a magnetic foreign matter separation device according to yet another modification. In this modification, some of the multiple linear members 15 are wavy, and the remaining linear members 15 are straight. For example, the linear member 15 on the far side as viewed from the insertion port 16 is wavy. The tension applied to the wavy linear member 15 is smaller than the tension applied to the straight linear member 15.

[0025] A portion of the powder fed from the feed port 16 falls in the area where the straight linear members 15 are arranged, and the remaining powder passes through gaps between the straight linear members 15 to reach the area where the wavy linear members 15 are arranged. In the area where the straight linear members 15 are arranged, the powder can easily pass through the gaps, so that the powder can be evenly dispersed in the flow path 11. In addition, because the tension of the wavy linear members 15 is low, when a clump of powder collides with the wavy linear members 15, the powder bounces back due to a spring effect, and the clumps are dissolved.

[0026] Next, a magnetic foreign matter separation system according to another embodiment will be described with reference to Fig. 6. The magnetic foreign matter separation system according to this embodiment is equipped with a plurality of magnetic foreign matter separation devices according to the above embodiment.

[0027] FIG. 6 is a schematic diagram of the magnetic foreign matter separation system according to this embodiment. The branch flow path 51 has one inlet and two outlets. Powder 31 mixed with magnetic foreign matter 32 is input from the inlet of the branch flow path 51. The two outlets of the branch flow path 51 are connected to the input ports 16 of the flow paths 11 of the magnetic foreign matter separators 50A and 50B, respectively. The outlets 17 of the flow paths 11 of the magnetic foreign matter separators 50A and 50B are connected to one inlet of the two-way switching valves 52A and 52B, respectively. The two-way switching valve 52A selects one of the first flow path 53A and the second flow path 54A, and directs the powder 31 and the like that flows in from the inlet to the selected flow path. Similarly, the two-way switching valve 52B selects one of the first flow path 53B and the second flow path 54B, and directs the powder 31 and the like that flows in from the inlet to the selected flow path. The powder and the like redirected to the first flow paths 53A and 53B join at the joining portion 55 and are discharged from a common outlet. In this manner, the two magnetic foreign matter separators 50A and 50B are connected in parallel.

[0028] The control device 58 controls the branch flow path 51, the two-way switching valves 52A and 52B, and the electromagnetic field generators 20 of the magnetic foreign matter separation devices 50A and 50B. An example of the control by the control device 58 will be described below.

[0029] The electromagnetic field generator 20 of one magnetic foreign matter separation device 50A is turned on, and the electromagnetic field generator 20 of the other magnetic foreign matter separation device 50B is turned off. The branch flow path 51 is switched so as to allow the powder 31 mixed with the magnetic foreign matter 32 to flow into the flow path 11 of the magnetic foreign matter separation device 50A. One two-way switching valve 52A is switched to the first flow path 53A, and the other two-way switching valve 52B is switched to the second flow path 54B.

[0030] In this state, when powder 31 containing magnetic foreign matter 32 is introduced from the inlet of branch flow path 51, the introduced powder 31 passes through flow path 11 of one of the magnetic foreign matter separation devices 50A, is redirected to first flow path 53A by two-way switching valve 52A, and is discharged from the outlet of junction 55. Because the electromagnetic field generator 20 of magnetic foreign matter separation device 50A is on, the magnetic foreign matter 32 is removed as the powder 31 passes through flow path 11.

[0031] Since the electromagnetic field generator 20 of the other magnetic foreign matter separator 50B is turned off, the magnetization of the linear member 15 (FIG. 1) weakens or becomes almost zero. As a result, the magnetic foreign matter 32 attracted to the linear member 15 in the magnetic foreign matter separator 50B falls by gravity. The magnetic foreign matter 32 discharged from the flow path 11 is redirected by the two-way switching valve 52B to the second flow path 54B and is discharged from the outlet of the second flow path 54B. This allows the magnetic foreign matter separator 50B to be cleaned.

[0032] Conversely, the electromagnetic field generator 20 of the magnetic foreign matter separator 50B may be turned on and the electromagnetic field generator 20 of the other magnetic foreign matter separator 50A may be turned off. In this case, the outlet on the magnetic foreign matter separator 50B side in the branch flow path 51 may be selected, the two-way switching valve 52B may be switched to the first flow path 53B, and the other two-way switching valve 52A may be switched to the second flow path 54A.

[0033] Next, the excellent effects of this embodiment will be described. In this embodiment, one of the two magnetic foreign matter separation devices 50A, 50B connected in parallel to each other can collect magnetic foreign matter 32, and the other magnetic foreign matter separation device can be cleaned. This makes it possible to continuously perform the process of removing magnetic foreign matter 32 from powder 31 containing magnetic foreign matter 32.

[0034] 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]

[0035] 10 Cylindrical member 11 Flow Path 12 First cover member 13 Second cover member 14 Tension adjustment bolt 15 Linear members 16 Inlet 17 Outlet 20 Electromagnetic Field Generator 31 Powder 32 Magnetic foreign matter 50A, 50B Magnetic foreign matter separation device 51 Branch Channel 52A, 52B Two-way valve 53A, 53B First flow path 54A, 54B Second flow path 55 Junction 58 Control device

Claims

1. A cylindrical member that defines a flow path through which the powder containing the magnetic foreign matter flows; a plurality of linear members made of a soft magnetic material arranged in the flow path along a flow direction of the powder; an electromagnetic field generator that generates a magnetic field in the flow path; a first cover member that closes one opening of the cylindrical member; a second cover member that closes the other opening of the cylindrical member and is disposed at an angle with respect to the flow direction of the powder; Equipped with a magnetic foreign matter separator, wherein both ends of the plurality of linear members are attached to the first cover member and the second cover member, respectively;

2. moreover, an inlet for injecting the powder from a side of the flow path; a discharge port for discharging the powder from a portion of the second cover member that is located on the most downstream side in a flow direction of the powder toward a side of the cylindrical member; The magnetic foreign matter separating device according to claim 1 .

3. 3. The magnetic foreign matter separator according to claim 1, wherein a cross section of each of the plurality of linear members is a convex polygon or a rounded convex polygon.

4. 4. The magnetic foreign matter separating device according to claim 1, wherein at least a portion of the plurality of linear members includes a wavy line portion.

5. 5. The magnetic foreign matter separator according to claim 1, wherein the distance between adjacent ones of the plurality of linear members is ten times or more the diameter of each of the plurality of linear members.

6. A plurality of magnetic foreign matter separation devices according to any one of claims 1 to 5; a branch flow path for selecting a part of the magnetic foreign matter separation devices from the plurality of magnetic foreign matter separation devices and supplying the powder to the flow path of the selected magnetic foreign matter separation device; a two-way valve connected to the flow path of each of the plurality of magnetic foreign matter separation devices and configured to direct the powder discharged from each of the plurality of magnetic foreign matter separation devices to one of a first flow path and a second flow path; A magnetic foreign body separation system comprising:

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