JP4320697B2 - Bar magnet fixing structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic foreign matter removing apparatus that removes magnetic foreign matter such as magnetic powder mixed in the fluid by the magnetic force of a bar magnet arranged in a moving path of the fluid such as powder and liquid. The present invention relates to a bar magnet fixing device .
[0002]
[Prior art]
In the manufacturing process of foods and drugs consisting of fluids such as powders and liquids, foreign substances such as metal powder in the target substance in the process of crushing raw materials with a crusher such as a power mill or the sieving process with a metal screen May be mixed. Thus, in order to remove the metal powder and the like mixed in the target substance, a magnetic foreign matter removing apparatus using a bar magnet has been conventionally used.
[0003]
FIG. 5 is a cross-sectional view showing a conventional fixing structure of a bar magnet used in such a magnetic foreign material removing apparatus. The bar magnet 50 is a circle made of a plurality of cylindrical permanent magnets 51 that are magnetized in the axial direction and arranged so that the same poles face each other, and a plurality of magnetic bodies inserted between the permanent magnets 51. A plate-shaped yoke 52, a permanent magnet 51 disposed at both ends of the yoke 52, a pair of end plugs 54 and 55 that sandwich the yoke 52 in the arrangement direction, and a non-magnetic cylindrical body that accommodates them. The tube 56 is comprised. The end plug 54 is fixed to the distal end portion of the tube 56 by welding 57. The end plug 55 is coupled to the support member 60 by a screw 58. The support member 60 is a support frame that supports the plurality of bar magnets 50, an inner wall of a chamber in which a target substance moves, or the like. The other end side of the tube 56 is in contact with the support member 60. Further, in order to improve the fixing strength of the bar magnet 60 to the support member 60 and prevent the target substance or magnetic powder from being mixed into the tube 16, the end portion of the bar magnet 50 that contacts the support member 60 at a right angle The support member 60 is fixed by welding 59.
[0004]
[Problems to be solved by the invention]
By the way, the thickness of the tube 56 constituting the bar magnet 50 is such a thickness that can sufficiently protect the internal permanent magnet 51 without reducing the magnetic flux density on the surface of the bar magnet so much, for example, 0.5-1. It is set to about 0 mm. For this reason, when welding is performed at the end portion of the tube 56, the tube 56 is not so thick that it cannot be sufficiently melted. In particular, the weld 59 between the support member 60 cannot provide sufficient welding strength, and the tube 56 and the end plug 55 are separated from each other, so that the bar magnet 50 is perpendicular to the support member 60. There is a problem of moving around in the direction. In such a structure, the tube 56 is detached from the support member 60 and the internal permanent magnet 51 jumps outward.
[0005]
The present invention has been made in view of such problems, and an object thereof is to provide a bar magnet fixing device that is stably supported by a support member.
[0006]
[Means for Solving the Problems]
A fixing device for a bar magnet according to the present invention includes a bar magnet that is disposed in a moving path of a fluid such as a granular material or a liquid and that adsorbs and removes magnetic foreign substances contained in the fluid by a magnetic force, and the bar magnet. A bar magnet fixing device including at least one end thereof, and the bar magnet is inserted between the permanent magnets and a plurality of permanent magnets arranged so that the same poles face each other. A yoke made of a plurality of magnetic bodies, a pair of end plugs arranged at both ends of the permanent magnet and the yoke to sandwich the plurality of permanent magnets and the yoke in the arrangement direction, and the plurality of permanent magnets and the yoke. A non-magnetic tube accommodated therein, and at least one of the end plugs has an end surface opposite to the permanent magnet and the yoke and the support member. Wear, and the outer peripheral surface of at least the supporting member side is exposed to the outside of the tube, between the support member and the exposed outer circumferential surface, characterized in that it is fixed by welding.
[0007]
According to the present invention, at least one of the pair of end plugs sandwiching the permanent magnet and the yoke constituting the bar magnet from both ends thereof is in intimate contact with the support member, and at least the outer peripheral surface of the support member is disposed on the outer peripheral surface of the tube. Since it is exposed to the outside and the outer peripheral surface of the exposed end plug is fixed to the support member by welding, the welded portion of the support member and the bar magnet can be sufficiently melted and joined. Strength can be increased.
[0008]
The end plug welded to the support member is formed in a cylindrical shape having a small diameter portion on the permanent magnet side and a large diameter portion on the support member side, and the small diameter portion is accommodated inside the tube, and the edge on the support member side of the large diameter portion The part may be welded to the support member. Also, if the edge of the support member side of the end plug welded to the support member forms a taper that smoothly joins the support surface of the support member with a predetermined curvature, for example, the welding operation becomes easy. Since the edge on the support member side forms a taper that smoothly joins the support surface of the support member with a predetermined curvature, the granular material or liquid that is the target substance is placed between the bar magnet and the support member. It does not collect at the connecting portion of the, and cleaning becomes easy.
[0009]
Further, a digging portion of a predetermined depth is formed on the surface where the end plug of the support member is in close contact, and the end plug welded to the support member is fitted to the digging portion of the support member. The bonding strength between the end plug and the support member can be further improved.
[0010]
In still another embodiment of the present invention, a shaft that penetrates the permanent magnet and the yoke in their arrangement direction is provided, and one end of the shaft passes through an end plug welded to the support member and is screwed into the support member. The other end of the shaft is screw-coupled to another end plug, and the pair of end plugs is accommodated in the tube at the end of each permanent magnet side, and the end opposite to the permanent magnet is the tube A large-diameter portion larger than the inner diameter is formed, and the tube is held by the large-diameter portion. If the bar magnet has such a structure, the rows of permanent magnets and yokes are stably held at both ends of the shaft, and even if the tube breaks, the permanent magnets do not jump out by magnetic force.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a bar magnet fixing device according to an embodiment of the present invention.
The bar magnet 10 differs from the conventional bar magnet 50 described above only in the structure on the end plug 15 side. That is, the bar magnet 10 is composed of a plurality of cylindrical permanent magnets 11 which are magnetized in the axial direction and arranged so that the same poles face each other, and a plurality of magnetic bodies inserted between the permanent magnets 11. A disc-shaped yoke 12, a pair of end plugs 14 and 15 that are disposed at both ends of the yoke 12 and sandwich the yoke 12 in the arrangement direction, and a non-magnetic cylinder that accommodates these. It is comprised from the tube 16 of the shape.
[0012]
The end plug 14 is cylindrical and is accommodated in the tube 16. The end plug 15 has a small diameter portion on the side facing the permanent magnet 11 in the axial direction and a large diameter portion on the opposite side. The small diameter portion is accommodated in the tube 16 and the large diameter portion is exposed to the outside of the tube 16. The permanent magnet 11 and the yoke 12 are sandwiched from both sides in the stacking direction between the end side edge of the end plug 14 and the end of the tube 16 and between the exposed outer peripheral surface of the end plug 15 and the end of the tube 16. In order to seal the inside of the tube 16, the tubes 16 are joined by weldings 17 and 17 ′. The end plug 15 is coupled to the support member 60 by a screw 18. The support member 60 is a support frame that supports the plurality of bar magnets 10 or an inner wall of a chamber in which a target substance moves. The end surface of the end plug 15 is in close contact with the support member 60, and the outer peripheral surface of the end surface and the support member 60 are fixed by welding 19.
[0013]
In the present embodiment, first, the end plugs 14 and 15 and the tube 16 are coupled by welding 17 and 17 '. Thereby, the permanent magnet 11 and the yoke 12 are held inside the tube 16 by the bar magnet 10 alone. Then, the bar magnet 10 is temporarily fixed to the support member 60 with the screw 18, and further completely coupled with the weld 19. In this structure, the end plug 15 having a thickness greater than that of the tube 16 and the support member 60 are coupled by the welding 19, so that sufficient melting can be achieved, whereby the coupling strength between the support member 60 and the bar magnet 10 is achieved. Is greatly improved.
[0014]
FIG. 2 is a view showing a bar magnet fixing device according to another embodiment of the present invention.
The bar magnet 20 is an annular magnet composed of a plurality of annular permanent magnets 21 that are magnetized in the axial direction and arranged so that the same poles face each other, and a plurality of magnetic bodies inserted between the permanent magnets 21. A yoke 22, a shaft 23 penetrating these in the arrangement direction (axial direction), a pair of end plugs 24, 25 arranged at both ends of the shaft 23 to sandwich the permanent magnet 21 and the yoke 22 in the arrangement direction, And a non-magnetic cylindrical tube 26 that accommodates them inside. Screw portions 23 a and 23 b are formed at both ends of the shaft 23, one screw portion 23 a is screwed to the end plug 24, and the other screw portion 23 a is screwed to the support member 70. The support member 70 is a support frame that supports a plurality of bar magnets, an inner wall of a chamber in which a target substance moves, or the like.
[0015]
The end plug 24 has a small diameter portion on the side facing the permanent magnet 21 in the axial direction and a large diameter portion on the opposite side. The small diameter portion is accommodated in the tube 26, and the large diameter portion is exposed to the outside of the tube 26. The end plug 25 also has a small diameter portion on the side facing the permanent magnet 21 in the axial direction and a large diameter portion on the opposite side. The small diameter portion is accommodated in the tube 26, and the large diameter portion is exposed to the outside of the tube 26. The outer peripheral portion exposed from the tube 26 of the end plug 25 and the support member 70 are fixed by welding 27.
[0016]
In this embodiment, after the shaft 23 is attached to the support member 70, the end plug 25, the tube 26, the permanent magnet 21, the yoke 22, the permanent magnet 21, the yoke 22,. Finally, the bar magnet 20 can be fixed to the support member 70 by welding the end plug 25 and the support member 70. The end plugs 24 and 25 and the tube 26 are appropriately sealed by welding, application of a sealing material, or the like.
[0017]
According to this embodiment, in addition to the effects described above, the permanent magnet 21 and the yoke 22 can be stably clamped from both sides by the end plugs 24 and 25 connected by the shaft 23.
[0018]
FIG. 3 is a cross-sectional view showing a main part of a bar magnet fixing device according to another embodiment of the present invention.
In the bar magnet 30 of this embodiment, the end of the end plug 31 on the support member 70 side of the large diameter portion forms a taper that smoothly joins the support surface of the support member 70 with a predetermined curvature. And the welding 32 is given to this taper part. Since other configurations are the same as those in FIG. 2, description of overlapping portions is omitted.
[0019]
According to such a configuration, the end portion on the support member 70 side of the end plug 31 forms a taper that smoothly joins the support surface of the support member 70 with a predetermined curvature. The body and liquid are less likely to accumulate, and the cleaning is easy. For this reason, it is possible to prevent an unfavorable situation from the standpoint of hygiene, particularly when the target substance is food or medicine. Further, since the end surface on the taper side of the end plug 31 abuts on the support surface of the support member 70 in a wide area, there is an effect that the end plug 31 is stably fixed to the support member 70.
[0020]
FIG. 4 is a cross-sectional view showing a main part of a bar magnet fixing device according to still another embodiment of the present invention.
In this embodiment, a digging portion 81 having a predetermined depth is formed on the surface to which the end plug 41 of the support member 80 to which the end plug 41 of the bar magnet 40 is fixed, and is fixed to the support member 80 by welding 42. The end plug 41 is fitted into the digging portion 81 of the support member 80. According to such a structure, there exists an effect that the intensity | strength with respect to the vertical load added to the bar magnet 40 can be improved.
[0021]
【The invention's effect】
As described above, according to the present invention, at least one of the pair of end plugs sandwiching the permanent magnet and the yoke constituting the bar magnet from both ends thereof is in close contact with the support member, and at least the outer periphery on the support member side. Since the surface is exposed to the outside of the tube and the exposed outer peripheral surface and the support member are fixed by welding, the welded portion of the support member and the bar magnet can be sufficiently melted. There is an effect that the bonding strength can be increased.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a bar magnet fixing device according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a bar magnet fixing device according to another embodiment of the present invention.
FIG. 3 is a cross-sectional view showing a main part of a bar magnet fixing device according to still another embodiment of the present invention.
FIG. 4 is a cross-sectional view showing a main part of a bar magnet fixing device according to still another embodiment of the present invention.
FIG. 5 is a cross-sectional view showing a conventional bar magnet fixing device .
[Explanation of symbols]
10, 20, 30, 40, 50 ... Bar magnets 11, 21, 51 ... Permanent magnets 12, 22,52 ... Yoke 14,15,24,25,31,41,54,55 ... End plug 16,26,56 ... ·············································································································· 17 .... Support members

Claims (5)

A bar magnet fixing device comprising: a bar magnet arranged on a moving path of a fluid to attract and remove magnetic foreign substances contained in the fluid by a magnetic force; and a support member that supports the bar magnet at least at one end thereof The bar magnet includes a plurality of permanent magnets arranged so that the same poles face each other, a yoke made of a plurality of magnetic bodies inserted between the permanent magnets, and both ends of the permanent magnet and the yoke. A pair of end plugs arranged and sandwiching the plurality of permanent magnets and the yoke in the arrangement direction; and a non-magnetic tube accommodating the plurality of permanent magnets and the yoke therein, and at least one of the ends The plug has an end surface opposite to the permanent magnet and the yoke that is in close contact with the support member, and at least an outer peripheral surface on the support member side is outside the tube. Exposed, the fixing device of the bar magnet between the support member and the exposed outer circumferential surface, characterized in that it is fixed by welding. The end plug welded to the support member is formed in a cylindrical shape having a small-diameter portion on the permanent magnet side and a large-diameter portion on the support member side, the small-diameter portion is accommodated in the tube, and the support of the large-diameter portion is provided. The bar magnet fixing device according to claim 1, wherein an edge portion on a member side is welded to the support member. 2. The end plug welded to the support member has an edge on the support member side formed with a taper that smoothly joins the support surface of the support member with a predetermined curvature. The bar magnet fixing device as described. A digging portion having a predetermined depth is formed on a surface of the support member where the end plug is in close contact, and the end plug welded to the support member is fitted into the digging portion of the support member. The bar magnet fixing device according to claim 1. The shaft includes a shaft penetrating the permanent magnet and the yoke in their arrangement direction, and one end of the shaft is threadedly coupled to the support member through an end plug welded to the support member, and the other end of the shaft Is screwed to another end plug, and each of the pair of end plugs has a large end larger than the inner diameter of the tube. The bar magnet fixing device according to any one of claims 1 to 4, wherein a diameter portion is formed and the tube is held by the large diameter portion.

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