Magnetic attraction device

Abstract

The objective of this invention is to provide a magnetic material adsorption device that can extend the lifespan of the protective member and protective coating of the magnet as much as possible. [Solution] The magnetic material adsorption device according to the present invention comprises a transport mechanism and a magnetic material adsorbent 1. The transport mechanism transports a lump 5 containing a magnetic material 6. The magnetic material adsorbent has a permanent magnet 8 and a covering 10. The covering covers the permanent magnet. The magnetic material adsorbent is suspended so as to be swingable within the transport path of the lump 6 of the transport mechanism.

Description

Technical Field

[0001] The present invention relates to a magnetic substance adsorbing device that adsorbs magnetic substances in raw materials to remove or separate magnetic substances from the raw materials.

Background Art

[0002] In order to prevent quality defects in products made from lumps such as sponge titanium as raw materials, it is necessary to suppress inclusions (foreign substances) in the raw materials (for example, see Non-Patent Document 1 below). The causes of inclusions in raw materials are various, but it is extremely difficult to completely prevent the inclusion of inclusions. Therefore, in many cases, measures are taken to check for the presence of inclusions before the raw materials are shipped and to exclude the inclusions if they are present.

[0003] In addition, magnetic substances may be included in the above-mentioned inclusions. As devices for removing magnetic substances, various magnetic substance adsorbing devices (for example, see Patent Documents 1 to 3) have been proposed. In these magnetic substance adsorbing devices, magnetic substances are selected or removed from raw materials by adsorbing magnetic substances using permanent magnets, electromagnets, etc.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Non-Patent Documents

[0005]

Non-Patent Document 1

[0006] In the magnetic material adsorption device described above, the magnet is usually protected by covering it with a protective member or protective film. However, the thicker the protective member or film, the weaker the magnetic force on the magnetic material becomes. Therefore, to maintain the performance of the magnet, it is preferable to make the protective member or film as thin as possible. However, the thinner the protective member or film, the shorter its lifespan becomes.

[0007] The objective of this invention is to provide a magnetic material adsorption device that can extend the lifespan of the protective member and protective coating of the magnet as much as possible. [Means for solving the problem]

[0008] The magnetic material adsorption device according to the first aspect of the present invention comprises a transport mechanism and a magnetic material adsorbent. The transport mechanism transports a lump containing a magnetic material. The term "lump" here may also include granules and powders. The magnetic material adsorbent has a permanent magnet and a coating. The coating covers the permanent magnet. The magnetic material adsorbent is suspended so as to be swingable within the transport path of the lump in the transport mechanism. The magnetic material adsorbent may be suspended so as to swing in any direction using a ball joint or the like, or it may be suspended so as to swing only in a direction parallel to the transport direction of the transport mechanism by being pivotally supported.

[0009] As described above, in this magnetic material adsorption device, the magnetic material adsorbent is suspended in a manner that allows it to swing within the transport path of the lumpy material transport mechanism. Therefore, when the lumpy material being transported by the transport mechanism comes into contact with the magnetic material adsorbent, the magnetic material adsorbent is pushed upward diagonally in the direction of transport by the lumpy material. As a result, the pressing force of the lumpy material on the magnetic material adsorbent is reduced compared to the pressing force when the magnetic material adsorbent is fixed. Therefore, in this magnetic material adsorption device, the lifespan of the protective members and protective coatings of the magnet can be extended as much as possible.

[0010] The magnetic material adsorption device according to the second aspect of this invention is the same as the magnetic material adsorption device according to the first aspect, and the magnetic material adsorbent is columnar in shape. This magnetic material adsorption device further comprises a bearing portion and a shaft. The bearing portion has a hole that extends along an axis perpendicular to the columnar axis of the magnetic material adsorbent. This bearing portion is attached to the upper side of the magnetic material adsorbent. The shaft is inserted through the bearing portion. The direction of oscillation of the magnetic material adsorbent is parallel to the conveying direction of the conveying mechanism.

[0011] Therefore, in this magnetic material adsorption device, the magnetic material adsorbent can be oscillated only in the direction of transporting the lump-shaped object.

[0012] The magnetic material adsorption device according to the third aspect of the present invention is the same as the magnetic material adsorption device according to the first aspect, and there are multiple magnetic material adsorbents, each suspended from a single support so that it can swing independently.

[0013] Therefore, in this magnetic material adsorption device, the width of the transport mechanism can be widened to improve the efficiency of tasks such as removing magnetic materials from lumpy objects.

[0014] The magnetic material adsorption device according to the fourth aspect of this invention is a magnetic material adsorption device according to the third aspect, and the magnetic material adsorbent is columnar in shape. Furthermore, this magnetic material adsorption device further includes a bearing portion. The bearing portion has a hole that extends along an axis perpendicular to the columnar axis of the magnetic material adsorbent. This bearing portion is attached to the upper side of the magnetic material adsorbent. A support is inserted through the bearing portion. The direction of oscillation of the magnetic material adsorbent is parallel to the conveying direction of the conveying mechanism.

[0015] Therefore, in this magnetic material adsorption device, the magnetic material adsorbent can be oscillated only in the direction of transporting the lump-shaped object.

[0016] The magnetic material adsorption device according to the fifth aspect of the present invention is a magnetic material adsorption device according to any one of the first to fourth aspects, and further includes a conveyance amount adjustment unit. The conveyance amount adjustment unit controls the conveyance mechanism to adjust the conveyance amount of the块状物. The magnetic material adsorbent has a columnar shape. And this conveyance amount adjustment unit adjusts the conveyance amount of the块状物 so that the angle formed by the column axis of the magnetic material adsorbent falls within the range of 30° or more and 50° or less with respect to the conveyance direction of the conveyance mechanism.

[0017] By the way, when there is unevenness in the placement amount of the块状物 in the conveyance direction, at the location where the placement amount is large (hereinafter sometimes referred to as "over-placement location"), the magnetic material adsorbent is greatly pushed upward obliquely above in the conveyance direction by the块状物, and after passing through that location, the magnetic material adsorbent falls in the opposite direction. In some cases, the falling magnetic material adsorbent collides with the next over-placement location. However, as described above, in this magnetic material adsorption device, the conveyance amount adjustment unit adjusts the conveyance amount of the块状物 so that the angle formed by the column axis of the magnetic material adsorbent falls within the range of 30° or more and 50° or less with respect to the conveyance direction of the conveyance mechanism. Therefore, the above situation can be avoided, and thus the durability period of the magnet protection member and the protective film can be made as long as possible.

Brief Description of the Drawings

[0018] [Figure 1] It is a perspective view of the magnetic material adsorption device according to an embodiment of the present invention. [Figure 2] It is a side view of the magnetic material adsorption device according to an embodiment of the present invention. In this figure, the magnet and the magnet holder are inclined at an angle θ. [Figure 3] It is a cross-sectional view showing the internal structure of the magnetic material adsorbent of the magnetic material adsorption device according to an embodiment of the present invention. [Figure 4] It is a perspective view of the magnetic material adsorption device according to another embodiment of the present invention.

Modes for Carrying Out the Invention

[0019] The magnetic material adsorption device according to the embodiment of the present invention is a device for removing or sorting relatively small magnetic materials (for example, magnetic powders such as rust flakes and magnetic particles of 10 mm or less) that may be present in a massive object such as spongy titanium, and mainly includes a conveying device, a magnetic material adsorbent, a bearing, and a shaft body. These components will be described in detail below.

[0020] (1) Conveying device The conveying device can be, for example, a vibrating feeder or a belt conveyor. Among the components of the conveying device within the magnetic field of the magnetic material adsorbent, it is necessary to be formed of a non-magnetic material. This is because if such components are magnetized, magnetic substances will accumulate on those components. Also, the conveying surface (the surface on which the massive object is placed) 3 of the conveying device is preferably horizontal (see FIGS. 1 and 2). This is to reduce the load on the magnetic material adsorbent received by the flow of the massive object.

[0021] While the conveying device is in operation, as shown in FIG. 2, when the massive object 5 conveyed by the conveying mechanism contacts the magnetic material adsorbent 1, the magnetic material adsorbent is pushed upward obliquely above the conveying direction by the massive object 5, and if there is a magnetic material 6 in the massive object 5, it will be adsorbed by the magnetic material adsorbent 1. Also, after that, when it comes to a state of no longer contacting the magnetic material adsorbent 1, the magnetic material adsorbent 1 moves obliquely downward in the opposite direction of the conveying direction by its own weight and returns to its original position and posture.

[0022] By the way, the conveying speed of the conveying device is preferably set so that the inclination angle θ (the angle of the column axis of the magnetic material adsorbent with respect to the vertical direction) of the magnetic material adsorbent (see FIG. 2) falls within the range of 30° to 50°. This is because by keeping the inclination angle of the magnetic material adsorbent within the above range, the removal ability of magnetic substances can be maintained well. The inclination angle θ of the magnetic material adsorbent is obtained from the image after taking a digital photo of the magnetic material adsorbent from the same position as in FIG. 2.

[0023] (2) Magnetic material adsorbent The magnetic material adsorbent 1 has a cylindrical shape, as shown in Figure 1, and is mainly composed of a plurality of permanent magnets 8, a plurality of yokes 9, a magnet cover 10, and a female screw portion 7, as shown in Figure 3. The permanent magnets 8 are disc-shaped permanent magnets and are housed in the magnet cover 10 in an arrangement such that like poles face each other across the yoke 9 along the longitudinal direction of the magnet cover 10 (i.e., the north poles face each other across the yoke 9 and the south poles face each other across the yoke 9), as shown in Figure 3. Furthermore, if the mass of the permanent magnets 8 is made of sponge titanium, the risk of combustion is reduced compared to electromagnets. In addition, this arrangement can generate a surface magnetic force of 10,000 to 11,000 gauss.

[0024] The magnet cover 10 is a cylindrical body made of stainless steel alloy (a magnetic material) with both ends closed, and houses multiple permanent magnets 8 and multiple yokes 9 in the state described above. By shaping the magnet cover 10 in this way, the magnetic material will be attracted to the downstream side of the magnetic material adsorbent 1 in the direction of transport, making it easy to not only see the magnetic material but also to remove the attracted magnetic material. Furthermore, when forming the magnet cover 10 by welding a cylindrical body and a disc body, it is desirable to use YAG welding instead of IG welding to eliminate the risk of tungsten contamination. In addition, it is preferable to reduce the roughness of the surface of the magnet cover by surface treatment (e.g., a polished finish).

[0025] Furthermore, as shown in Figures 2 and 3, a female threaded portion 7 is formed on the base end of the magnet cover 10. A male threaded portion (not shown) extending radially from the outer circumferential surface of the bearing 2 is screwed into this female threaded portion 7, thereby connecting the magnetic material adsorbent 1 to the bearing 2. As will be described later, the bearing 2 is inserted onto the shaft 4 so that the magnetic material adsorbent 1 can swing relative to the shaft 4. Therefore, when no bulk material is in contact, the tip of the magnetic material adsorbent 1 faces the conveying surface 3 of the conveying device.

[0026] (3) Bearings The bearing 2 is a cylindrical body with openings on both sides. As described above, the bearing 2 has a male threaded portion that extends radially from its outer surface, and this male threaded portion is screwed into the female threaded portion 7 on the base end side of the magnet cover 10, thereby connecting the magnetic material adsorbent 1 to the bearing 2. The bearing 2 is inserted onto the shaft 4 so that the magnetic material adsorbent 1 can swing relative to the shaft 4. It is preferable that the inner surface of the bearing 2 be surface-treated to provide low resistance, but instead, a bearing may be placed inside the bearing 2. Furthermore, the use of lubricating oil is not envisioned because it may cause contamination of the raw materials.

[0027] (4) Shaft The shaft 4 is a cylindrical rod (shaft) with at least one end fixed to a frame (not shown). As described above, this shaft 4 is inserted through the through hole of the bearing 2 so that the magnetic material adsorbent 1 can swing.

[0028] <Features of the magnetic material adsorption device according to an embodiment of the present invention> In the magnetic material adsorption device according to the embodiment of the present invention, the magnetic material adsorbent 1 is suspended so as to be swingable within the transport path of the lump 5 of the transport mechanism. When the inclination angle of the magnetic material adsorbent 1 exceeds 50°, the transport speed of the transport device is reduced, and when the inclination angle falls below 30°, the transport speed of the transport device is increased. As a result, the pressing force of the lump 5 on the magnetic material adsorbent 1 when the lump 5 being transported by the transport mechanism contacts the magnetic material adsorbent 1 and pushes the magnetic material adsorbent 1 diagonally upward in the transport direction is reduced compared to the pressing force when the magnetic material adsorbent is fixed. Therefore, in this magnetic material adsorption device, the lifespan of the magnet cover 10 can be extended as much as possible.

[0029] <Variation> (A) Although not mentioned in the previous embodiment, as shown in Figure 4, a bearing 2 corresponding to each magnetic material adsorbent 1 may be inserted into a single shaft 4 so that multiple magnetic material adsorbents 1 can swing independently. Such a connecting structure can be applied to conveying devices with different widths of conveying surfaces 3. However, if the magnetic material adsorbents 1 are too close together, mutual interference between permanent magnets may cause the swinging of the magnetic material adsorbents 1 to become unstable. On the other hand, if the magnetic material adsorbents 1 are too far apart, regions will be created where magnetic material in the mass cannot be adsorbed. For this reason, it is desirable to place spacers of an appropriate width between the bearings 2.

[0030] (B) In the magnetic material adsorption device according to the above embodiment, the magnet cover 10 of the magnetic material adsorbent 1 was cylindrical in shape, but the shape of the magnet cover 10 is not limited to a cylindrical shape and may take any shape.

[0031] (C) In the magnetic material adsorption device according to the above embodiment, a shaft and bearing were used to allow the magnetic material adsorbent 1 to swing, but other connecting members such as ball joints may be used instead. By using a ball joint, the magnetic material adsorbent 1 can also be swung in the width direction of the conveying device. In such a case, a restricting member may be used to restrict the swing range. [Industrial applicability]

[0032] The magnetic material adsorption device according to this invention has the feature of being able to extend the lifespan of the protective member and protective coating of the magnet as much as possible, and can be used industrially as a magnetic material adsorption device that requires such features. [Explanation of symbols]

[0033] 1 Magnetic material adsorbent 2 bearings 3. Conveying surface 4-axis body 5. Lumps 6 Magnetic materials 7 Female threaded section 8 permanent magnets 9. Yoke 10 Magnetic cover

Claims

1. A transport mechanism for transporting a block-like object containing magnetic material, A magnetic material adsorbent having a permanent magnet and a covering body that covers the permanent magnet, and suspended in the transport path of the lump-shaped object of the transport mechanism so as to be swingable. A magnetic material adsorption device equipped with the following features.

2. The magnetic material adsorbent is columnar in shape. A bearing portion having a hole extending along an axis perpendicular to the column axis of the magnetic material adsorbent, which is attached to the upper side of the magnetic material adsorbent, A shaft inserted into the bearing portion and Furthermore, The oscillation direction of the magnetic material adsorbent is parallel to the transport direction of the transport mechanism. The magnetic material adsorption apparatus according to claim 1.

3. Multiple magnetic adsorbents exist, each suspended from a single support so that it can swing independently. The magnetic material adsorption apparatus according to claim 1.

4. The magnetic material adsorbent is columnar in shape. The magnetic material adsorbent has a hole that extends along an axis perpendicular to the column axis of the magnetic material adsorbent, and further comprises a bearing portion attached to the upper side of each of the magnetic material adsorbents, The support is inserted through the bearing portion, The oscillation direction of the magnetic material adsorbent is parallel to the transport direction of the transport mechanism. The magnetic material adsorption apparatus according to claim 3.

5. The system further includes a conveyance amount adjustment unit that controls the conveyance mechanism to adjust the amount of the lump-shaped material being conveyed, The magnetic material adsorbent is columnar in shape. The transport amount adjustment unit adjusts the transport amount of the lump so that the angle formed by the column axis of the magnetic material adsorbent with respect to the transport direction of the transport mechanism falls within the range of 30° to 50°. A magnetic material adsorption device according to any one of claims 1 to 4.

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