JP5090781B2 - Permanent magnet anticorrosion method - Google Patents

Description

  The present invention relates to a method for preventing corrosion of sintered metal, a corrosion-resistant magnet, and a magnetic adsorption device.

Nd—Fe—B permanent magnets are known as permanent magnets with excellent magnetic properties. Further, since the main components of Nd—Fe—B permanent magnets are Nd (neodymium) and Fe (iron), the raw materials are cheaper than Sm—Co permanent magnets, and Sm—Co permanents. It has better magnetic properties than magnets.
On the other hand, the Nd—Fe—B permanent magnet has a drawback that it is easily oxidized by moisture in the atmosphere. Specifically, the Nd-Fe-B permanent magnet is a sintered metal obtained by sintering a metal powder as a composition, and since the intermetallic compound crystal particle interval is large, moisture in the air is likely to enter. In addition, since the main components Nd and Fe are easily oxidizable elements, the oxidation proceeds very easily.
Therefore, in Nd—Fe—B permanent magnets, resin coating or Ni plating is usually applied to the surface of the magnet. Further, other coatings have been studied. For example, Patent Document 1 discloses forming a composite coating of flaky powder of Al or Mg and alkali silicate glass.
JP 2006-049864 A

However, the anticorrosion techniques in the conventional Nd—Fe—B permanent magnets including the above-mentioned Patent Document 1 are intended to prevent the permanent magnets from being corroded in the atmosphere. The use of is not envisaged.
That is, the current common sense is that Nd—Fe—B permanent magnets cannot be used in the severe corrosive environment of water or the sea, and attempts to use Nd—Fe—B permanent magnets in water or in the sea. Is not made.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to provide a method for effectively preventing the corrosion of sintered metal in a severe corrosive environment such as a high humidity environment or water. It is said.
Another object of the present invention is to provide a corrosion-resistant magnet that includes a permanent magnet having a strong attractive force and that can be used in water due to excellent corrosion resistance, and a magnetic adsorption device including the same.

The anticorrosion method for sintered metal according to the present invention is a method for preventing corrosion of sintered metal in a humid atmosphere or an electrolyte solution, and includes an anticorrosive member including an anticorrosive material serving as a sacrificial anode for the constituent components of the sintered metal. Is placed in the humid atmosphere or in the electrolyte solution together with the sintered metal in a state of being in contact with the sintered metal directly or through another conductive member.
Corrosion of the sintered metal in a humid atmosphere or in an electrolyte solution results from the formation of a galvanic battery by a potential difference between a plurality of substances constituting the sintered metal. Therefore, if the anticorrosion member containing the anticorrosive material to be the sacrificial anode is placed in a humid environment or an electrolyte solution together with the sintered metal in a state of being in contact with the sintered metal as in the present invention, the anticorrosion member becomes the sacrificial anode. Thus, the anticorrosion current can be supplied to the sintered metal, and the formation of the galvanic battery inside the sintered metal can be prevented. Thereby, corrosion of the sintered metal in a severe corrosive environment can be effectively prevented.

It is preferable that the anticorrosion member has an anticorrosion sheet formed by stretching the anticorrosion material into a sheet shape.
By using the sheet-like anticorrosive member, handling becomes easy, and it is also easy to dispose it so as to cover the surface of the sintered metal.

It is preferable that the anticorrosion member has a powder of the anticorrosion material and an organic substance mixed with the powder.
In this case, the anticorrosion current can be supplied from the powder of the anticorrosion material. And according to this structure, since it becomes easy to make an anticorrosion member into paste form, while being easy to handle, the holding | maintenance in the state contacted to the surface of the sintered metal also becomes easy.

  It is preferable to adhere the sintered metal and the anticorrosion sheet through a conductive adhesive. According to this anticorrosion method, the electrical connection between the anticorrosion sheet and the sintered metal can be made more reliable, and corrosion can be prevented stably over a long period of time.

  It is preferable that the conductive adhesive contains zinc or a zinc alloy powder. According to this anticorrosion method, the anticorrosion current can be efficiently and stably supplied via the conductive adhesive, and corrosion can be prevented stably over a long period of time.

In order to solve the above problems, the corrosion-resistant magnet of the present invention is a corrosion-resistant magnet that can be applied to a magnetic adsorption device used in an electrolyte solution, and serves as a sacrificial anode serving as a sacrificial anode for the permanent magnet and the constituent components of the permanent magnet. And an anticorrosion member that includes a material and is electrically connected to the permanent magnet.
According to this configuration, since the anticorrosion member provided in contact with the permanent magnet is provided, the anticorrosion current that is sufficient to prevent corrosion even when used in the state of being submerged in water or seawater from the anticorrosion member. Can be supplied to a permanent magnet. Therefore, the corrosion-resistant magnet of the present invention is a corrosion-resistant magnet that can be suitably used for a magnetic adsorption device used in water or in seawater and can maintain the adsorption force for a long period of time.
The permanent magnet and the anticorrosion member may be arranged in direct contact with each other, or may be electrically connected via another conductive member.

  It is preferable that the anticorrosion material contains zinc or a zinc alloy. Examples of the anticorrosive material that becomes the sacrificial anode of iron constituting the permanent magnet include zinc, aluminum, magnesium, and alloys thereof. Among these, zinc or zinc alloy is most suitable in consideration of anode potential, anode efficiency, amount of electrolytic product generated, and difficulty in handling.

It is preferable that the anticorrosion member has an anticorrosion sheet formed by stretching the anticorrosion material into a sheet shape.
By being in the form of a sheet, it becomes easy to handle and it is also easy to dispose it so as to cover the surface of the permanent magnet.

It is preferable that the anticorrosion member has a powder of the anticorrosion material and an organic substance mixed with the powder.
As the anticorrosive member, an anticorrosive material powder mixed with an organic substance may be used. Also in this case, the anticorrosion current can be continuously supplied to the permanent magnet by the powder of the anticorrosion material. Moreover, since it can be easily made into a paste, it is easy to handle and can be easily held in contact with the surface of the permanent magnet.

It is preferable that the permanent magnet and the anticorrosion sheet are bonded via a conductive adhesive.
By setting it as such a structure, the conductive connection of a corrosion prevention sheet and a permanent magnet can be hold | maintained stably, and favorable corrosion resistance can be hold | maintained over a long period of time.

It is preferable that the conductive adhesive contains zinc or a zinc alloy powder.
By setting it as such a structure, supply of the corrosion-proof electric current from a corrosion-proof member to a permanent magnet comes to be made more efficiently, and corrosion of a permanent magnet can be prevented stably.

  It is preferable that the permanent magnet includes iron and the anticorrosion member includes an anticorrosion material that serves as a sacrificial anode of the iron. According to this configuration, a corrosion-resistant magnet including an iron-containing permanent magnet that is inexpensive and has excellent magnetic properties can be realized.

The permanent magnet is preferably a permanent magnet represented by RE-Fe-MB. However, RE is at least one rare earth element selected from the group consisting of Nd, Y, La, Ce, Pr, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, and M is Co, Ti Nb, Al, V, Mn, Sn, Ca, Mg, Pb, Sb, Zn, Si, Zr, Cr, Ni, Cu, Ga, Mo, W, Ta, and at least one element selected from the group consisting of .
By using these rare earth permanent magnets, a corrosion-resistant magnet having excellent magnetic properties can be obtained. Since rare earth permanent magnets are sintered metals and contain oxidizable materials, they could not be used in harsh corrosive environments in the past. It becomes possible to use, and the range of use of rare earth permanent magnets can be expanded.

The magnetic attraction apparatus of the present invention is characterized by comprising the corrosion-resistant magnet of the present invention and a conductive member that contacts the corrosion-resistant magnet.
According to this configuration, the excellent corrosion resistance of the corrosion-resistant magnet according to the present invention prevents the permanent magnet from corroding even when used in water or in seawater, and therefore provides a magnetic adsorption device suitable for underwater use. Can do.

  The anticorrosion member may be in contact with only the conductive member. Also in this case, the anti-corrosion current from the anti-corrosion member can be supplied to the permanent magnet via the conductive member, and the magnetic adsorption device can be used without problems in a high humidity environment, in water, in sea water, or the like.

The magnetic adsorption apparatus of the present invention includes the corrosion-resistant magnet of the present invention and a yoke that forms a magnetic circuit together with the corrosion-resistant magnet, and the anticorrosion member is provided between the permanent magnet and the yoke. It is characterized by.
That is, the anticorrosion member can function as a spacer between the permanent magnet and the yoke. With such a configuration, the attractive force can be greatly improved, the installation space for the anticorrosion member and the like can be saved, and the magnetic attractive device can be downsized.

The yoke includes a back yoke portion that attracts the permanent magnet, and an outer yoke portion that is formed integrally with the back yoke portion and disposed on the outer peripheral side of the permanent magnet, and the outer yoke portion and the It can also be set as the structure by which the said anti-corrosion member is provided between permanent magnets.
According to this configuration, a magnetic attraction apparatus having a strong attraction force with a simple configuration can be realized.

It is preferable that a screw shaft portion protruding from the surface is provided on a surface of the back yoke portion opposite to the permanent magnet.
By setting it as such a structure, it can attach to an installation apparatus easily via the said screw shaft part.

A screw hole portion penetrating the screw shaft portion and the back yoke portion in the axial direction of the screw shaft may be formed.
According to this configuration, the length of the bolt tip projecting from the attracting surface of the magnetic attracting device is adjusted by screwing the bolt into the screw hole and rotating it around the axis to advance and retract the bolt with respect to the yoke. Thereby, the attractive force of the magnetic adsorption device can be adjusted. Therefore, according to this structure, the safety | security at the time of making a magnetic adsorption apparatus adsorb | suck to an adsorption | suction target object can be improved, and position adjustment etc. can be performed easily now.

The permanent magnet is substantially ring-shaped, and the yoke has an inner peripheral yoke portion disposed on the inner peripheral side of the permanent magnet and an outer peripheral yoke portion disposed on the outer peripheral side of the permanent magnet. It is preferable that the anticorrosion member is provided between the inner peripheral yoke portion and the permanent magnet and between the outer peripheral yoke portion and the permanent magnet.
According to this configuration, since the attracting portions are formed between the inner peripheral yoke portion and the permanent magnet and between the outer peripheral yoke portion and the permanent magnet, respectively, the magnetic attracting device can be manufactured without increasing the size of the permanent magnet. Adsorption power can be increased. That is, a smaller magnetic attraction apparatus can be obtained if the attraction force is comparable.

  The screw hole portion may be configured to penetrate the inside of the inner circumferential yoke portion. According to this configuration, it is possible to arrange the bolt for adjusting the attractive force without interfering with the permanent magnet and without increasing the size of the magnetic adsorption device.

According to the anticorrosion method for sintered metal of the present invention, it is possible to satisfactorily prevent the corrosion of the sintered metal in a humid environment or in an electrolyte solution, so that the sintered metal can be used in an environment that has been conventionally disabled. Can be.
Moreover, the corrosion-resistant magnet of the present invention can be suitably used for a magnetic adsorption device used in an electrolyte solution such as in water or seawater, and can maintain an adsorption force for a long period of time.
The magnetic adsorption device of the present invention can be used for a long period of time in water or seawater.

(First embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Fig.1 (a) is a figure which shows the 1st structural example of the corrosion-resistant magnet which concerns on this invention. FIG.1 (b) is a figure which shows the 2nd structural example of the corrosion-resistant magnet which concerns on this invention.

  A corrosion-resistant magnet 110 of the first configuration example shown in FIG. 1A includes a ring-shaped Nd—Fe—B permanent magnet (hereinafter referred to as a neodymium magnet) 111 having a through hole 111a in the center, and a neodymium magnet 111. And an anticorrosion sheet (anticorrosion member) 112 bonded to one main surface (the upper surface in the drawing). The anticorrosion sheet 112 has a ring shape corresponding to the planar shape of the neodymium magnet 111.

  A corrosion-resistant magnet 120 of the second configuration example shown in FIG. 1B includes a substantially plate-shaped square neodymium magnet 113 and a corrosion-proof sheet 114 bonded to the surface of the neodymium magnet 113. As shown in the drawing, the anticorrosion sheet 114 is attached to the neodymium magnet 113 in a cap shape covering one main surface of the rectangular magnet and each side end surface.

  The permanent magnets provided in the corrosion resistant magnets 110 and 120 are not limited to Nd—Fe—B permanent magnets, but are RE—Fe—MB (RE is Nd, Y, La, Ce, Pr, Sm, Eu, Gd). , Tb, Dy, Ho, Er, Tm, Yb, Lu, at least one rare earth element selected from the group consisting of M, Co, Ti, Nb, Al, V, Mn, Sn, Ca, Mg, Pb, Sb, In addition to iron-based rare earth permanent magnets represented by Zn, Si, Zr, Cr, Ni, Cu, Ga, Mo, W, Ta), Sm-Co magnets, ferrite magnets Etc. can also be used. These permanent magnets may have a resin film or a plating film formed on the surface.

  The anticorrosion sheets 112 and 114 are metal sheet members obtained by stretching a zinc or zinc alloy plate material to about 50 μm to 500 μm (preferably 100 μm to 200 μm). By using a thin sheet-like anticorrosive member, it becomes easy to ensure adhesion to the neodymium magnets 111 and 113, and handling of the anticorrosive member is easy. Further, the overall shape of the corrosion-resistant magnets 110 and 120 can be made substantially the same as that of the neodymium magnets 111 and 113, and further, the corrosion-resistant magnets 110 and 120 can be prevented from increasing in size by providing a corrosion-proof member.

  The constituent components of the anticorrosion sheets 112 and 114 are not limited to zinc and zinc alloys, and any material that functions as a sacrificial anode of a neodymium magnet, such as aluminum or magnesium, can be used. Zinc is most suitable in consideration of anode potential, anode efficiency, amount of electrolytic product generated, and difficulty in handling.

  The neodymium magnet 111 and the anticorrosion sheet 112, and the neodymium magnet 113 and the anticorrosion sheet 114 are preferably bonded to each other via a conductive adhesive. By setting it as such a structure, the electrical continuity with the neodymium magnet 111 and the anticorrosion sheet | seat 112 and the electrical continuity with the neodymium magnet 113 and the anticorrosion sheet | seat 114 can be ensured reliably. Moreover, since the anticorrosion sheet | seats 112 and 114 are adhere | attached on a neodymium magnet, it can prevent that an anticorrosion sheet | seat peels or drops | omits at the time of use.

  As the conductive adhesive, for example, a mixture of metal particles in a resin adhesive can be used, and it is preferable to use zinc powder or zinc alloy powder as the metal particles. By using the metal particles containing zinc, the anticorrosion current from the anticorrosion sheets 112 and 114 is efficiently and reliably supplied to the neodymium magnet.

  The anticorrosion magnets 110 and 120 according to the present invention having the above-described configuration are anticorrosion provided in contact with the neodymium magnets 111 and 113 in an electrolyte solution (liquid indicating conductivity) such as in water and seawater or in a humid atmosphere. The sheets 112 and 114 function as sacrificial anodes for the neodymium magnets, and can effectively prevent the neodymium magnets 111 and 113 from being corroded by the anticorrosion current supplied from the anticorrosion sheets 112 and 114. .

Here, FIG. 2 is an explanatory diagram of a corrosion progress model of the neodymium magnet 111, and shows the structure of the surface layer of the neodymium magnet 111.
As shown in FIG. 2A, the neodymium magnet 111 includes a relatively large crystal grain main phase 501, a grain boundary phase 502 formed so as to fill the space between the main phases 501, and a grain boundary phase 502. The oxide layer 503 is generally configured to include the formed oxide phase 503. The main phase 501 is a crystal phase of an intermetallic compound mainly composed of iron and neodymium represented by the composition formula Nd ₂ Fe ₁₄ B, and the grain boundary phase 502 is an Nd-rich phase containing more Nd than the main phase, The oxide phase 503 is a phase mainly composed of neodymium oxide (Nd ₂ O ₃ ).

In the neodymium magnet 111 having the above-described configuration, as shown in FIG. 2B, corrosion proceeds from the surface due to moisture or the like in contact with the surface. In FIG. 2B, the part where the grain boundary phase 502 is hatched is a corroded portion 505. Specifically, iron oxidation (Fe → Fe ₂ O ₃ .H ₂ O) proceeds on the surface of the main phase 501, and neodymium oxidation (Nd → Nd ₂ O ₃ , Nd (OH) in the grain boundary phase 502. ) ₃ ) goes on.
In the neodymium magnet 111, the main phase 501 containing iron as a main component, the grain boundary phase 502 that is an Nd-rich phase, the boron-rich phase (not shown), and the like are mixed, so that the metal is present in the presence of moisture (electrolyte). A galvanic battery is formed by the potential difference between them. As a result, the metal serving as the anode is corroded and worn, so that the bonds between the crystals are broken and the strength is lost.

  Then, as shown in FIG. 2C, when the corrosion progresses in the surface layer portion, the main phase 501 cannot be held in the corroded portion 505, and the main phase 501 falls off to expose the internal structure. Thereafter, the same corrosion as described above occurs with respect to the exposed portion, and wear of the neodymium magnet 111 proceeds. In the neodymium magnet 111 that is a sintered metal, since there are many voids in the structure, moisture and the like easily enter the inside through the voids, and corrosion generated on the surface easily proceeds to the inside.

Therefore, like the corrosion-resistant magnets 110 and 120 of this embodiment, the corrosion-resistant magnets 110 and 120 are disposed in a humid atmosphere or an electrolyte solution by providing the anticorrosion sheets 112 and 114 that are in contact with the neodymium magnets 111 and 113. Sometimes the anticorrosion current is supplied from the anticorrosion sheets 112 and 114 to the neodymium magnets 111 and 113.
Thereby, even when moisture or the like permeates the inside of the magnet, the formation of the galvanic battery inside the magnet can be avoided, and when placed in the electrolyte solution, the neodymium magnets 111 and 113 are preceded. The anticorrosion sheets 112 and 114 are corroded, and the neodymium magnets 111 and 113 can be protected.

Since the corrosion phenomenon shown in FIG. 2 proceeds easily even when the neodymium magnet is placed in the atmosphere, the surface of the neodymium magnet is usually coated for the purpose of anticorrosion. As such a surface coating, the following (1) to (4) are known.
(1) Aluminum coating (thickness 5-20 μm)
(2) Nickel plating coating (thickness 10-20 μm)
(3) Titanium coating (thickness 5-7 μm)
(4) Application of organic paint (thickness 10-50 μm)

By applying the surface coating described above, corrosion of the neodymium magnet in the atmosphere can be prevented to some extent. However, only the above surface coating cannot sufficiently prevent corrosion in a severe corrosive environment such as a humid atmosphere or in an electrolyte solution.
First, when a neodymium magnet with a metal coating is placed in the electrolyte solution, a galvanic battery is formed between the metal coating and another metal material that contacts (electrically connects to) the metal coating. Corrosion proceeds with metal coating.
As shown in the above (1) to (3), since the thickness of the film is about 5 to 20 μm in the metal coating, the metal coating is worn out in a short time and the neodymium magnet is exposed. When the neodymium magnet is exposed, a corrosion battery is formed between the neodymium magnet and the metal coating, and the corrosion progresses, and the metal coating erodes violently from small holes.
Further, since a pinhole always exists in a film formed by plating or ion plating, corrosion also proceeds from this pinhole. And as a result of electrolyte solution permeating from the corroded portion and further progressing corrosion, demagnetization occurs and the function as a magnet is lost.
In addition, although the thickness of the organic coating applied is about 50 μm, the corrosion resistance of the organic coating itself is insufficient, so that even if it is applied thickly, corrosion easily occurs in the electrolyte solution.

On the other hand, in the corrosion-resistant magnets 110 and 120 of this embodiment, the progress of corrosion in the electrolyte solution is suppressed by the anti-corrosion sheets 112 and 114, and the neodymium magnet has an action completely different from the anti-corrosion coating of the neodymium magnet. This is to prevent corrosion. That is, the surface of the neodymium magnet is not covered with a thin film to prevent corrosion, but corrosion of the neodymium magnet is prevented by positively supplying an anticorrosion current from the anticorrosion member serving as the sacrificial anode.
Therefore, a neodymium magnet which is not surface-coated can be used in the present invention, and the anticorrosive action in the present invention is completely different from that of the conventional coating. However, this does not preclude the use of a permanent magnet with a surface coating in the corrosion-resistant magnet according to the present invention.

  In addition, although this embodiment demonstrated the neodymium magnet which is an example of a sintered metal, the anticorrosion method which concerns on this invention is not limited to anticorrosion of a rare earth permanent magnet. That is, if it is a sintered metal produced by powder metallurgy using a plurality of types of metal powders, and the corrosion proceeds according to the corrosion progression model shown in FIG. However, the anticorrosion method according to the present invention can be applied. As a result, the sintered metal can be used even in a severe corrosive environment that could not be used conventionally.

(Second Embodiment)
In the first embodiment, the most basic configuration of the corrosion-resistant magnet according to the present invention has been described. However, in this embodiment, a magnetic adsorption device including a corrosion-resistant magnet and a yoke, which is a mode actually used. Will be described.

[First Configuration Example of Second Embodiment]
FIG. 3A is a plan view of the magnetic attraction apparatus 130 as the first configuration example in the present embodiment, and FIG. 3B is a position along the line AA ′ in FIG. It is sectional drawing.
3, the same reference numerals are given to the same components as those in FIGS. 1 and 2, and detailed description thereof will be omitted.

  As shown in FIG. 3, the magnetic adsorption device 130 includes a ring-shaped neodymium magnet 111, a cap-shaped yoke 131 attached to the neodymium magnet 111, and an outer surface side of the yoke 131 (the side opposite to the neodymium magnet 111). The cap-shaped anticorrosion member 132 is attached.

  The yoke 131 is made of a steel material, and includes a disc-shaped back yoke portion 133 that faces the magnet surface on the back side of the neodymium magnet 111 and a cylindrical outer yoke portion 134 that faces the outer circumferential surface of the neodymium magnet 111. It is the structure formed integrally. Further, in the magnetic adsorption device 130, the yoke 131 is a conductive member made of steel, so the neodymium magnet 111 and the anticorrosion member 132 are electrically connected via the yoke 131.

  The outer peripheral yoke portion 134 of the yoke 131 has a height higher than that of the neodymium magnet 111. As shown in FIG. 3B, the outer peripheral yoke portion 134 is opened with the neodymium magnet 111 accommodated in the yoke 131. The end on the side projects from the magnet surface of the neodymium magnet 111 to the opening side. By making the yoke protrude from the magnet in this way, the neodymium magnet 111 can be protected from friction and impact when the magnetic attraction device 130 is attracted to the object to be attracted, and the neodymium magnet 111 is worn away. , Can be prevented from cracking.

  The anticorrosion member 132 is made of an anticorrosion sheet obtained by rolling zinc or a zinc alloy to a thickness of about 100 to 200 μm. The anticorrosion member 132 is bonded to the outer surface side (the side opposite to the neodymium magnet 111) of the back yoke portion 133 of the yoke 131 and the outer peripheral surface of the outer yoke portion 134. In the case of this example, the anticorrosion member 132 is also bonded to the inner peripheral surface (surface on the neodymium magnet 111 side) of the outer peripheral yoke portion 134. As described in the first embodiment, a conductive adhesive is preferably used for bonding the yoke 131 and the anticorrosion member 132. With such a configuration, the yoke 131 and the anticorrosion member 132 can be bonded to each other. The conduction can be ensured, and the neodymium magnet 111 and the anticorrosion member 132 can be brought into a good conduction state via the yoke 131.

  As the anticorrosion sheet, a sheet having a thickness of 50 μm or more is preferably used, and a thickness of 100 μm or more is more preferable. If the thickness is further increased, the anticorrosive member can obtain an anticorrosive action for an extremely long time. The thickness of the anticorrosion sheet increases the period during which the anticorrosion effect can be obtained, while the thinner one is advantageous in terms of processing and handling. Therefore, it may be appropriately selected according to the shape of the neodymium magnet 111 and the yoke 131. . However, since the thickness of the plating film used conventionally (about 5 to 20 μm) does not provide a sufficient anticorrosive action in water or seawater, the neodymium magnet 111 may be corroded. It is necessary to ensure.

  A through hole 131a is formed in the central portion of the yoke 131 in plan view, and a magnetic adsorption device 130 can be attached to the equipment by inserting a bolt (not shown) into the through hole 131a and fastening it with a nut. . An internal thread portion for screwing a bolt may be formed on the inner peripheral surface of the through hole 131a. With such a configuration, the magnetic adsorption device 130 can be fixed only by screwing the bolt inserted into the bolt hole of the equipment into the through hole 131a, and the mounting work can be reduced.

As described above, the magnetic adsorption device 130 of the present embodiment includes the neodymium magnet 111 and the anticorrosion member 132 electrically connected thereto. Therefore, like the corrosion-resistant magnets 110 and 120 according to the present invention, extremely high anticorrosion properties are exhibited in water or seawater (in the electrolyte solution).
Thereby, the magnetic adsorption apparatus 130 of this embodiment can be used suitably for adsorption | suction with respect to a steel structure in water and seawater, and can acquire favorable adsorption | suction power over a long period of time.
In addition, since the magnetic adsorption apparatus 130 according to the present invention has excellent corrosion resistance as described above, it is suitable for use underwater or underwater, but its use is not limited to underwater or underwater. Of course, use in the atmosphere is also possible.

[Second Configuration Example of Second Embodiment]
Next, a second configuration example of the present embodiment will be described with reference to FIG.
FIG. 4A is a plan view of a magnetic attracting apparatus 140 as a second configuration example, and FIG. 4B is a cross-sectional view taken along the line BB ′ in FIG. .
4, the same reference numerals are given to the same components as those in FIGS. 1 to 3, and detailed descriptions thereof will be omitted.

  As shown in FIG. 4, the magnetic attraction apparatus 140 of this example is common to the magnetic attraction apparatus 130 of the first configuration example in that it includes a ring-shaped neodymium magnet 111 and a cap-shaped yoke 131. . And in the magnetic adsorption apparatus 140, the magnetic adsorption which concerns on a 1st structural example by the point provided with the anti-corrosion member 142a formed in the outer peripheral surface of the neodymium magnet 111, and the anti-corrosion member 142b formed in the inner peripheral surface of the neodymium magnet 111. Different from the device 130.

  As shown in FIG. 4A, each of the anticorrosion members 142a and 142b has a ring shape in plan view, and is formed so as to cover the outer peripheral surface and the inner peripheral surface of the neodymium magnet 111, respectively. In the case of this configuration example, the anticorrosion members 142a and 142b are flexible anticorrosion members, and in this example, it is a flexible zinc anode in which zinc powder or zinc alloy powder is mixed with a resin material or the like to form a paste. .

The flexible anticorrosive member may be at least a paste (putty) having viscosity at the time of application. That is, you may solidify by the heat processing after application | coating, or a drying process. Furthermore, it may not have conductivity at the time of application, and may exhibit conductivity by heat treatment or drying treatment.
In addition, zinc is most suitable as the metal powder contained in the flexible anticorrosive member in consideration of anode potential, anode efficiency, the amount of electrolytic product generated, and difficulty in handling.

  The anticorrosion members 142a and 142b are preferably formed to a thickness of 50 μm or more, and more preferably 500 μm or more. Furthermore, if it is 1 mm or more in thickness, it will become an anti-corrosion member which can acquire anti-corrosion action for a very long time. If the thickness of the plating film conventionally used (about 5 to 20 μm) is not sufficient in water or seawater, the neodymium magnet 111 may be corroded. By setting the thickness within the above-mentioned range, a corrosion-resistant magnet having a sufficient amount of anti-corrosion member can be configured, and it will not corrode even if used in water or seawater for a long period of time, and will maintain its adsorption power. Can do.

  The magnetic attraction apparatus 140 of the present configuration example having the above configuration also includes the neodymium magnet 111 and the anticorrosion members 142a and 142b in contact with the magnet, so that the magnetic attraction apparatus can be used for a long time in water or seawater. It has become. In addition, since the opening end of the outer yoke part 134 protrudes to the opening side from the magnet surface of the neodymium magnet 111, the neodymium magnet 111 is protected from impact and friction when the attracting operation is performed using the magnetic attracting device 140. can do.

  In this configuration example, the neodymium magnet 111 and the outer yoke part 134 are separated by the anticorrosion member 142a. That is, the anticorrosion member 142 a also functions as a spacer between the neodymium magnet 111 and the yoke 131. Thereby, it can prevent that a short circuit magnetic flux arises between the outer peripheral surface of the neodymium magnet 111, and the inner peripheral surface of the outer peripheral yoke part 134, and can improve the attractive_force | adsorptive_power of the magnetic adsorption apparatus 140. FIG.

  Furthermore, in this configuration example, by forming the anticorrosion member 142a to have a uniform thickness, the spacing between the neodymium magnet 111 and the outer yoke part 134 can be kept uniform, A uniform suction force in the circumferential direction can be obtained at the opening end of the outer yoke portion 134.

In this configuration example, flexible anticorrosive members are arranged on the inner peripheral surface and the outer peripheral surface of the neodymium magnet 111. By using a paste-like material in this way, the gap between the yoke 131 and the neodymium magnet 111 is used. There is an advantage that it becomes easy to fill the anticorrosion member 142a.
Further, as the anticorrosion members 142a and 142b, the same anticorrosion sheet as in the first configuration example may be used instead of the flexible zinc anode. Whichever form of the anticorrosion member is used, it can function well as a sacrificial anode.

[Third Configuration Example of Second Embodiment]
Next, a third configuration example of the present embodiment will be described with reference to FIG.
Fig.5 (a) is a top view of the magnetic attraction apparatus 150 which is a 3rd structural example, FIG.5 (b) is sectional drawing of the position along CC 'line of Fig.5 (a). .
In FIG. 5, the same components as those in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof will be omitted.

  As shown in FIG. 5, the magnetic attraction apparatus 150 of this configuration example includes a substantially plate-shaped rectangular neodymium magnet 113, a substantially U-shaped yoke 151 in cross-section, and a corrosion-resistant member 152 bonded to the surface of the yoke 151. It is configured with. The neodymium magnet 113 is attracted to the substantially rectangular back yoke portion 153 of the yoke 151.

The yoke 151 is made of a steel material and has electrical conductivity. Therefore, the neodymium magnet 113 and the anticorrosion member 152 are electrically connected via the yoke 151.
The anticorrosion member 152 is the same anticorrosion sheet (zinc or zinc alloy material rolled into a sheet shape) as in the first configuration example, and the outer surface side of the yoke 151 (the side opposite to the neodymium magnet 113) and the neodymium magnet 113. Are adhered to the inner surface side of the side wall portion 154 of the yoke 151 opposite to the side end surface. For adhesion between the anticorrosion sheet and the yoke 151, a conductive adhesive is preferably used.

  Since the magnetic attraction apparatus 150 having the above configuration also includes the neodymium magnet 113 and the anticorrosion member 152 electrically connected to the neodymium magnet 113, it exhibits excellent corrosion resistance in water and seawater and is used for a long period of time. It can be a magnetic adsorption device. Further, since the tip of the side wall of the yoke 151 protrudes to the tip side (the lower side in the drawing) from the magnet surface of the neodymium magnet 113, the neodymium magnet is affected by impact and friction when the suction operation is performed using the magnetic suction device 150. 113 can be protected.

[Fourth Configuration Example of Second Embodiment]
Next, a fourth configuration example of the present embodiment will be described with reference to FIG.
FIG. 6A is a plan view of a magnetic attraction device 160 as a fourth configuration example, and FIG. 6B is a cross-sectional view at a position along the line DD ′ in FIG. .
In FIG. 6, the same components as those in FIG. 5 are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 6, the magnetic attraction apparatus 160 of this example is common to the magnetic attraction apparatus 150 of the previous fourth configuration example in that it includes a square neodymium magnet 113 and a yoke 151 having a substantially U-shaped cross section. To do. And in the magnetic adsorption apparatus 160, the magnetic which concerns on a 4th structural example by the point by which the anticorrosion member 162 is provided between the side end surface of the neodymium magnet 113 and the side wall part 154 of the yoke 151 which opposes this side end surface. Different from the adsorption device 150.
The anticorrosion member 162 is a flexible zinc anode in which zinc powder or zinc alloy powder is mixed with a resin material or the like to form a paste. This is the same as the anticorrosion members 142a and 142b according to the previous third configuration example.

  The magnetic adsorption device 150 of the present configuration example having the above configuration also includes the neodymium magnet 113 and the anticorrosion member 162 in contact with the magnetic adsorption device 150. Therefore, the magnetic adsorption device that can be used for a long time in water or seawater It has become. Further, since the tip of the side wall portion 154 of the yoke 151 protrudes to the tip side of the magnet surface of the neodymium magnet 113, the neodymium magnet 111 is affected by the impact and friction when the attracting operation is performed using the magnetic attracting device 160. Can be protected.

  In this configuration example, the neodymium magnet 113 and the side wall 154 of the yoke 151 are separated by the anticorrosion member 162. That is, the anticorrosion member 162 also functions as a spacer between the neodymium magnet 113 and the yoke 151. Thereby, it can prevent that a short circuit magnetic flux arises between the outer peripheral surface of the neodymium magnet 113, and the side wall part 154 of the yoke 151, and can improve the attraction force of the magnetic attraction apparatus 160. FIG.

  Furthermore, in this embodiment, since the anticorrosion member 162 is formed to have a uniform thickness, the distance between the neodymium magnet 113 and the side wall portion 154 of the yoke 151 can be kept uniform. A uniform attracting force can be obtained at the tip of the side wall portion 154 serving as a surface.

[Fifth Configuration Example of Second Embodiment]
Next, a fifth configuration example of this embodiment will be described with reference to FIGS.
FIG. 7 is a perspective view of a magnetic adsorption device 170 as a fifth configuration example. Fig.8 (a) is a top view which shows the state which installed the installation apparatus using the magnetic adsorption apparatus 170 shown in FIG. 7, FIG.8 (b) shows the EE 'line of Fig.8 (a). It is sectional drawing of the position which follows.
7 and 8, the same reference numerals are given to the same components as those in FIGS. 1 to 6, and a detailed description thereof will be omitted.

  As shown in FIGS. 7 and 8, the magnetic adsorption device 170 of this embodiment includes a cap-shaped yoke 171, a ring-shaped neodymium magnet 111, and an anticorrosive member provided in a gap between the yoke 171 and the neodymium magnet 111. 142a and 142b. In this embodiment, the neodymium magnet 111 and the anticorrosion members 142a and 142b that are in contact with the neodymium magnet 111 constitute the corrosion-resistant magnet 176 according to the present invention.

  The yoke 171 is made of a steel material, a disc-shaped back yoke portion 173 facing the magnet surface on the back side of the neodymium magnet 111, a cylindrical outer yoke portion 174 facing the outer peripheral surface of the neodymium magnet 111, In this configuration, the inner peripheral yoke portion 175 facing the inner peripheral surface of the neodymium magnet 111 is integrally formed. That is, the yoke 171 has a ring-shaped groove portion in plan view formed by the back yoke portion 173, the outer peripheral yoke portion 174, and the inner peripheral yoke portion 175, and the corrosion-resistant magnet 176 is accommodated in the groove portion. It has become.

The groove portion of the yoke 171 is formed to a depth larger than the height of the neodymium magnet 111. As shown in FIG. 8B, the outer yoke portion 174 and the inner yoke portion 174 are disposed in a state where the corrosion-resistant magnet 176 is accommodated in the yoke 171. An end portion on the opening side of the circumferential yoke portion 175 protrudes closer to the attracting object 1000 than the magnet surface of the neodymium magnet 111. Thus, by making the yoke protrude from the magnet, the neodymium magnet 111 can be protected from friction and impact when the magnetic attraction device 170 is attracted to the object to be attracted, and the neodymium magnet 111 is worn away. , Can be prevented from cracking.
The anticorrosion members 142a and 142b provided between the neodymium magnet 111 and the yoke 171 are also disposed in the groove portion of the yoke 171 so as to prevent wear of the anticorrosion members 142a and 142b. .

  The back yoke portion 173 is formed with a plurality of (three in FIG. 7) through holes 173a that penetrate the back yoke portion 173 and reach the neodymium magnet 111. These through holes 173 a are used when the neodymium magnet 111 is accommodated in the yoke 171. An adsorption regulating member such as a shaft or a bolt is inserted into the through hole 173 a so that the tip of the shaft protrudes inside the yoke 171. By doing so, it is possible to restrict the neodymium magnet 111 from being attracted to the back yoke portion 173 by a shaft or the like. Accordingly, it is possible to prevent the neodymium magnet 111 from being drawn into the yoke 171 and colliding with the back yoke portion 173, and being cracked or chipped by the impact.

  Moreover, it is preferable that an internal thread part is formed in the internal peripheral surface of the through-hole 173a, and a volt | bolt can be screwed together. If the bolt is screwed from the outside of the yoke 171 and the tip of the bolt is advanced and retracted with respect to the back yoke portion 173, the neodymium magnet 111 and the back yoke portion 173 can be gently adsorbed, and the neodymium magnet 111 Can be safely and reliably accommodated.

  A screw hole portion 171a to which a bolt 178 for connecting the magnetic adsorption device 170 to other equipment is attached is formed in the central portion of the yoke 171. As shown in FIG. 8B, the screw hole portion 171 a is formed so as to penetrate the back yoke portion 173 and the inner peripheral yoke portion 175, and the male screw portion 179 of the bolt 178 is formed on the inner peripheral surface thereof. The internal thread part screwed together is formed.

  The neodymium magnet 111 and the anticorrosion members 142a and 142b provided in the corrosion resistant magnet 176 are the same as those in the second configuration example. However, in this configuration example, the inner peripheral yoke portion 175 is provided on the yoke 171, and the anticorrosion member 142 b provided on the inner peripheral surface of the neodymium magnet 111 is the inner peripheral surface of the inner peripheral yoke portion 175 and the neodymium magnet 111. It is in a state filled with.

  The magnetic attraction apparatus 170 of the fifth configuration example having the above configuration can be suitably used for installation of equipment 1100 as shown in FIG. 8, for example. In this example, plate-like attachment portions 1101 projecting sideways are provided on both side end surfaces of the box-shaped equipment 1100 in the longitudinal direction. The magnetic adsorption device 170 is attached to the equipment 1100 by inserting a bolt 178 into the bolt hole of the attachment portion 1101 and fastening the male screw portion 179 of the bolt 178 to the screw hole portion 171 a of the yoke 171.

  Then, if the opening side of the yoke 171 of the magnetic adsorption device 170 is brought close to the adsorption object 1000 such as a steel plate together with the equipment 1100, the equipment 1100 can be adsorbed and fixed to the adsorption object 1000. At this time, if a cushion member 1102 made of an elastic material is provided on the surface of the equipment device 1100 on the suction target object 1000 side, the equipment device 1100 is affected by impact and friction when the equipment device 1100 is sucked and fixed by the magnetic suction device 170. Can be protected, and the safety of the installation work can be improved.

  As described above, the magnetic adsorption device 170 of the present configuration example has the anticorrosion magnet 176 according to the present invention, so that it exhibits extremely high anticorrosion properties in water or in seawater, and is excellent over a long period of time. It is a magnetic adsorption device that can obtain an attractive force.

  In this configuration example, the yoke 171 has a double yoke structure including an outer peripheral yoke portion 174 and an inner peripheral yoke portion 175. By adopting such a configuration, the attracting portions are respectively provided between the attracting surface of the neodymium magnet 111 and the open end of the outer yoke portion 174, and between the attracting surface of the neodymium magnet 111 and the open end of the inner peripheral yoke portion 175. Therefore, a larger attractive force can be obtained as compared with the magnetic attractive device 140 having only the outer peripheral yoke portion shown in FIG. Therefore, according to the magnetic attraction apparatus 170 of this configuration example, a sufficient attraction force can be obtained using the relatively small neodymium magnet 111. Moreover, since the magnetic attraction apparatus 170 itself can be reduced in size by this, even if the surface of the object to be attracted is uneven or warped due to the deposit, it can be attracted using a narrow smooth surface. Become.

  In this configuration example, the neodymium magnet 111, the outer yoke part 174, and the inner yoke part 175 are separated by the anticorrosion members 142a and 142b. That is, the anticorrosion members 142 a and 142 b also function as spacers between the neodymium magnet 111 and the yoke 171. Thereby, it is possible to prevent a short-circuit magnetic flux from being generated between the outer peripheral surface of the neodymium magnet 111 and the outer peripheral yoke portion 174 and between the inner peripheral surface of the neodymium magnet 111 and the inner peripheral yoke portion 175. Adsorption power can be increased.

  Furthermore, in the present embodiment, the anticorrosion members 142a and 142b are formed to have a uniform thickness so that the distance between the neodymium magnet 111 and the outer yoke part 174 and the distance between the neodymium magnet 111 and the inner yoke part 175 are uniform. Therefore, a uniform attracting force can be obtained in the circumferential direction at the opening end of the outer peripheral yoke portion 174 and the opening end of the inner peripheral yoke portion 175, which are the attracting surfaces of the magnetic attracting device 170.

  In the present embodiment, the anticorrosion members 142 a and 142 b are provided so as to contact only the outer peripheral surface and the inner peripheral surface of the neodymium magnet 111, and are formed on the magnet surface of the neodymium magnet 111 facing the opening side of the yoke 171. Not. That is, in the present invention, the anticorrosion members 142a and 142b only need to be provided in contact with at least the neodymium magnet 111, and do not need to be formed so as to cover the neodymium magnet 111. Therefore, the gap between the magnet surface of the neodymium magnet 111 and the object to be attracted can be narrowed, and a large attracting force can be obtained. However, it goes without saying that an anticorrosion member such as an anticorrosion sheet may also be provided on the magnet surface of the neodymium magnet 111.

  In this embodiment, since the anticorrosion members 142a and 142b function as spacers that separate the yoke 171 and the neodymium magnet 111, the gap between the outer yoke portion 174 and the inner yoke portion 175 and the neodymium magnet 111 is increased. The anticorrosion members 142a and 142b are filled, but when the spacer is provided separately, the anticorrosion members 142a and 142b do not need to fill the entire gap between the magnet and the yoke. In addition, the anticorrosion member can be moved at a position where it can be electrically connected to the neodymium magnet 111.

[Sixth Configuration Example of Second Embodiment]
Next, a sixth configuration example of this embodiment will be described with reference to FIGS.
FIG. 9 is an exploded perspective view of a magnetic attraction apparatus 180 as a sixth configuration example. FIG. 10A is a plan view showing a state in which equipment is installed using the magnetic adsorption device 180 shown in FIG. 9, and FIG. 10B is a cross-sectional view taken along line FF ′ in FIG. It is sectional drawing of the position which follows.
9 and 10, the same reference numerals are given to the same components as those in FIGS. 1 to 8, and detailed description thereof will be omitted.

  As shown in FIGS. 9 and 10, the magnetic adsorption device 180 of this configuration example includes an adsorption device main body 180a and a nut 180b for fixing the adsorption device main body 180a to equipment or the like. The bolt 188 is an attracting force adjusting member that is used by being screwed to the attracting device main body 180 a and is used to adjust the attracting force with respect to the attracting object by moving forward and backward from the attracting surface of the magnetic attracting device 180.

  The attracting apparatus main body 180a includes a ring-shaped neodymium magnet 111, a cap-shaped yoke 181 that accommodates the neodymium magnet 111, a screw shaft portion 186 that is formed on the surface of the yoke 181 opposite to the neodymium magnet 111, The anticorrosion members 142a and 142b provided in the gap between the yoke 181 and the neodymium magnet 111 are provided. Also in this embodiment, the anticorrosion members 142a and 142b are disposed in contact with the neodymium magnet 111, and thus the neodymium magnet 111 and the anticorrosion members 142a and 142b constitute the corrosion-resistant magnet 176 according to the present invention.

  Similarly to the yoke 171 of the magnetic attraction apparatus 170 of the fifth configuration example, the yoke 181 is opposed to the disc-shaped back yoke portion 183 facing the magnet surface on the back side of the neodymium magnet 111 and the outer peripheral surface of the neodymium magnet 111. The cylindrical outer yoke part 184 and the inner peripheral yoke part 185 facing the inner peripheral surface of the neodymium magnet 111 are integrally formed. Therefore, the yoke 181 accommodates the corrosion-resistant magnet 176 in a ring-shaped groove formed by the back yoke portion 183, the outer peripheral yoke portion 184, and the inner peripheral yoke portion 185 in plan view.

  As shown in FIG. 10, the groove portion of the yoke 181 is formed to a depth larger than the height of the neodymium magnet 111, and the outer yoke portion 184 and the inner yoke are provided with the corrosion-resistant magnet 176 accommodated in the yoke 181. An end portion on the opening side of the portion 185 projects outward from the magnet surface of the neodymium magnet 111. By making the yoke protrude from the magnet in this way, the neodymium magnet 111 can be protected from friction and impact when the magnetic attraction device 180 is attracted to the object to be attracted, and the neodymium magnet 111 is worn away. , Can be prevented from cracking.

The screw shaft portion 186 is formed in a cylindrical shape integrally with the yoke 181, and the direction of the screw shaft matches the normal direction of the back yoke portion 183. On the outer peripheral surface of the screw shaft portion 186, a male screw portion 186a for screwing the nut 180b is formed.
Further, the screw shaft portion 186 is formed with a screw hole portion 181a penetrating the screw shaft portion 186 in the axial direction. The screw hole portion 181a further includes the back yoke portion 183 and the inner peripheral yoke portion 185 of the yoke 181. And penetrates. That is, the screw hole portion 181a is formed so as to penetrate the suction device main body 180a in the height direction. On the inner surface of the screw hole portion 181a, a female screw portion that is screwed with the male screw portion 189 of the bolt 188 is formed.

The nut 180b screwed into the male screw portion 186a of the screw shaft portion 186 is a locking nut, and in this example, a friction ring 187 coaxial with the screw hole of the nut 180b is provided. The friction ring 187 has a claw projecting toward the center of the screw hole, and the nut 180b is screwed into the screw shaft 186 so that the claw is deformed in contact with the thread of the male screw 186a. The male screw portion 186a is pressed by the reaction force generated by this deformation. The free rotation of the nut 180b is limited by the frictional force between the friction ring 187 and the male screw portion 186a, and the nut 180b is prevented from loosening.
The structure for preventing the nut 180b from being loosened is not particularly limited, and various structures such as a structure using a spring ring, a double nut structure, a structure using a resin ring can be used in addition to a structure using a friction ring. .

  As shown in FIG. 9, the back yoke portion 183 has a plurality of through holes 183 a that penetrate the back yoke portion 183 and reach the neodymium magnet 111. Although only two through holes 183a are shown in FIG. 9, in practice, three through holes 183a are formed at intervals of 120 ° in the direction around the axis with respect to the center of the back yoke portion 183. Similar to the fifth configuration example, these through holes 183a have a function of preventing the neodymium magnet 111 from being cracked or chipped by an impact when the neodymium magnet 111 is accommodated in the yoke 181. Moreover, it is preferable that the through-hole 183a in this embodiment also has an internal thread part formed in an inner surface, and can be screwed together.

  The magnetic attraction apparatus 180 of the present embodiment having the above configuration can be suitably used for installation of equipment 1100 as shown in FIG. 10, for example. In this example, the screw shaft portion 186 of the suction device main body 180a is inserted into the bolt hole of the attachment portion 1101 provided in the box-shaped equipment 1100, and the nut 180b is fastened to the screw shaft portion 186 from the opposite side to the yoke 181. As a result, the magnetic adsorption device 180 is attached to the equipment 1100. And the installation apparatus 1100 can be fixed to the adsorption | suction object 1000 by making the opening side of the yoke 181 of the magnetic adsorption apparatus 180 approach the adsorption | suction object 1000, such as a steel plate, with the installation apparatus 1100.

  Further, as shown in FIG. 10, in the magnetic adsorption device 180, the bolt 188 screwed into the screw hole 181 a can be advanced and retracted from the tip side of the screw shaft portion 186. That is, the protruding length of the bolt 188 from the suction surface of the yoke 181 can be freely adjusted. Therefore, in this embodiment, the space | interval of the adsorption | suction surface of the magnetic adsorption apparatus 180 and the adsorption | suction object 1000 can be adjusted with the advance / retreat of the volt | bolt 188, and adsorption force can be controlled.

That is, when the equipment 1100 is installed on the adsorption target 1000, the magnetic adsorption device 180 is brought close to the adsorption target 1000 with the tip of the bolt 188 protruding from the adsorption portion of the magnetic adsorption device 180.
At this time, the yoke 181 of the magnetic attraction apparatus 180 is prevented from contacting the object to be attracted 1000 by the tip of the bolt, so that the magnetic attraction apparatus 180 is attracted to the attraction object 1000 by a weak force or not at all. Become.
Thereafter, by retracting the bolt 188 from the yoke 181, the magnetic attraction device 180 and the object to be attracted 1000 can be gradually approached and attracted.
Therefore, according to this structure, it can avoid that the equipment 1100 is drawn near to the adsorption | suction target object 1000 rapidly.

  The bolt 188 also functions effectively when the equipment device 1100 is removed from the adsorption object 1000. That is, in the attracting state shown in FIG. 10B, when the bolt 188 is rotated about the axis and the tip of the bolt 188 is advanced toward the attracting target 1000, the magnetic attracting device 180 is pulled away from the attracting target 1000. Can do. The neodymium magnet 111 used in the magnetic attraction device 180 has an extremely strong attraction force, so it is difficult to pull it away manually, but in this example, it can be easily pulled only by operating the bolt 188. Moreover, since the bolt 188 is held in a state of protruding from the attracting surface, the separated magnetic attracting device 180 is not attracted to the attracting object 1000 again, and the work can be performed safely.

  Furthermore, the bolt 188 also functions effectively when adjusting the position of the equipment 1100 after installation. That is, by operating the bolt 188, when the magnetic suction device 180 is slightly pulled away from the suction target object 1000, the magnetic suction device 180 is in a state of being attracted to the suction target object 1000 with a weak force. In this state, the equipment 1100 can be easily moved. Therefore, after moving the equipment 1100 to a desired position, the bolt 188 is operated to attract the magnetic adsorption device 180. By making it adsorb | suck to the target object 1000 again, a position adjustment operation | work can be implemented safely.

  Thus, according to the magnetic adsorption device 180, the installation, removal, or position adjustment of the equipment 1100 can be performed easily and safely.

  Moreover, in the magnetic attraction apparatus 180 of this example, the bolt 188 can be arranged in a strong pressure state with respect to the object to be attracted 1000 by using a bolt 188 having a conical pointed tip. . Thus, a reliable and stable conduction state can be obtained in applications that require conduction between the adsorption object 1000 and the magnetic adsorption device 180, for example, when the equipment 1100 is an aluminum alloy anode.

  In addition, the magnetic adsorption apparatus 180 of this embodiment is provided with the corrosion-resistant magnet 176 which concerns on this invention as mentioned above. Therefore, it is needless to say that the magnetic adsorption device 180 can be suitably used for adsorption to a steel structure in water or seawater and can obtain a good adsorption force over a long period of time. Of course, the magnetic adsorption device 180 of this embodiment can also be used in the atmosphere.

  Hereinafter, specific examples of use of the magnetic adsorption apparatus of the present invention will be described.

(First embodiment)
In this example, the magnetic attracting device 140 having the configuration shown in FIG. 4 and the magnetic attracting device 170 having the configuration shown in FIG. 7 were produced, and the respective attracting forces were verified.

First, the magnetic adsorption device 140 having the configuration shown in FIG. 4 was produced. The magnetic adsorption device 140 has a single yoke structure in which a yoke (outer peripheral yoke portion 134) is provided on the outer peripheral portion of the neodymium magnet.
As the neodymium magnet, a ring-shaped magnet having a surface area of 36 cm ² , an outer diameter of 70 mm, an inner diameter of 32 mm, and a thickness of 15 mm was used. The yoke 131 was produced by cutting a steel material. The anticorrosion members 142a and 142b were formed by filling a flexible zinc anode containing zinc powder into a gap having a thickness of 2 mm.

When the adsorption force of the magnetic adsorption device 140 having the above-described configuration was measured, the horizontal direction (normal direction of the adsorption surface; tensile load) was about 100 kg (2.7 kg / cm ² ), and the vertical direction (adsorption surface direction; shear). It was confirmed that an adsorption force of about 50 kg (1.4 kg / cm ² ) was obtained at a load. The magnetic attracting force of the magnetic attracting device 140 is approximately 15 times the horizontal attracting force (170 g / cm ² ) of the bond magnet (the resin material mixed with magnetic powder), and the attracting force in the vertical direction (170 g / cm ² ). ² ), which is about 20 times larger, and the plane area required to obtain the same level of adsorption force can be greatly reduced.

Next, a magnetic adsorption device 170 having the configuration shown in FIG. 7 was produced. The magnetic adsorption device 170 has a double yoke structure in which yokes are provided on the inner and outer peripheral portions of a neodymium magnet.
As the neodymium magnet, a ring-shaped magnet having a surface area of 36 cm ² , an outer diameter of 70 mm, an inner diameter of 32 mm, and a thickness of 15 mm was used. The yoke 171 was manufactured by cutting out a steel material. The anticorrosion members 142a and 142b were formed by filling a flexible zinc anode containing zinc powder in a gap having a thickness of 2 mm.

When the adsorption force of the magnetic adsorption device 170 having the above configuration was measured, the horizontal direction (normal direction of the adsorption surface; tensile load) was about 170 kg (4.7 kg / cm ² ), and the vertical direction (adsorption surface direction; shear). It was confirmed that an adsorption force of about 80 kg (2.2 kg / cm ² ) was obtained at a load.
The magnetic attracting force of the magnetic attracting device 170 is about 1.7 times the attracting force of the magnetic attracting device 140 having the single yoke structure. By adopting the double yoke structure in this way, the attracting force is not increased. Can be greatly improved, and it is possible to cope with adsorption and fixing of heavy equipment.

  Note that the magnetic adsorption device 180 shown in FIG. 9 also has a neodymium magnet and a yoke structure having the same dimensions as those of the magnetic adsorption device 170 of the present embodiment. An adsorption force of about 80 kg can be obtained in the direction of the adsorption surface.

  In addition, in order to verify the effect of the anticorrosion member, the inventor produces a comparative magnetic adsorption device (hereinafter referred to as a comparison device) together with the magnetic adsorption device 170 (hereinafter referred to as the present invention device). Corrosion experiments were conducted on the device of the present invention and the comparative device. The comparison device is obtained by omitting the anticorrosion members 142a and 142b in the device of the present invention (magnetic adsorption device 170).

  In addition, in the present invention apparatus and the comparison apparatus used for the corrosion test, assuming actual usage, a neodymium magnet having a Ni plating coating (thickness 20 μm) on the surface is used, and the steel is used as the yoke. The surface of which was galvanized (thickness 20 μm) was used.

The corrosion test was performed by immersing the device of the present invention and the comparative device prepared above in a saline solution having a salinity concentration (3%) close to seawater and observing it while keeping it at room temperature.
As a result of regular follow-up, the zinc plating on the yoke surface was discolored after three months in the comparison device, and the progress of corrosion was confirmed. On the other hand, in the device of the present invention, neither the yoke nor the neodymium magnet was discolored, and the corrosion of the yoke and the neodymium magnet did not proceed at all.
Thereafter, in the observation after the elapse of 6 months from the start of the test, it was confirmed that the Ni plating coating on the surface was worn in the neodymium magnet of the comparative device. On the other hand, in the device of the present invention, neither the yoke nor the neodymium magnet was discolored, and the corrosion of the yoke and the neodymium magnet did not proceed at all.
Thereafter, in the observation after 8 months from the start of the test, the corrosion of the neodymium magnet further progressed in the comparative device, but in the device of the present invention, no discoloration was observed in the yoke and the neodymium magnet, and the corrosion of the yoke and the neodymium magnet was observed. It was confirmed that no progress was made.

(Second embodiment)
In the following second to fourth embodiments, specific usage examples of the magnetic attraction apparatus according to the present invention will be described.

  First, the second embodiment is an example of an galvanic anode provided with the magnetic adsorption device 180 having the configuration shown in FIG. Specifically, it is the example which employ | adopted the magnetic adsorption apparatus which concerns on the attachment structure part about the electrodynamic anode (aluminum alloy anode) used for the steel sheet pile type quay protection of a power plant.

Fig.11 (a) is a top view which shows the galvanic anode which concerns on 2nd Example, FIG.11 (b) is a fragmentary sectional view which follows the GG 'line | wire of Fig.11 (a).
The galvanic anode 1200 shown in FIG. 11 extends in a substantially rectangular parallelepiped anode body 1201, a box-shaped anode tray 1202 that accommodates the anode body 1201, and side portions located at both ends of the anode tray 1202 in the long side direction. A plate-shaped attachment portion 1203 provided and a magnetic adsorption device 180 attached to the attachment portion 1203 are provided.

The anode body 1201 is made of zinc, magnesium, or an alloy of these or aluminum, and typically an aluminum alloy is used. In this embodiment, an aluminum alloy anode having a weight of 22 kg is used.
The anode tray 1202 and the attachment portion 1203 are manufactured using a steel material. The anode body 1201 is housed in the anode tray 1202 and is fixed to the anode tray 1202 using a fixing tool such as a bolt. Further, the anode main body 1201 and the anode tray 1202 are in a conductive state. Also, a cushion member 1204 made of an elastic material is provided on the lower surface of the anode tray 1202 (the surface opposite to the anode body 1201).
The magnetic adsorption device 180 is fastened to the mounting portion 1203 by inserting a screw shaft portion 186 through a bolt hole formed in the mounting portion 1203 and screwing a nut 180b into the screw shaft portion 186.

In the present embodiment, the anode main body 1201 has a weight of 22 kg. Therefore, in order to obtain a suction power of 110 kg with a safety factor of 5 times in consideration of the effects of waves and tidal currents, a magnetic suction device 180 of 80 kg in the vertical direction is used. As shown in FIG. 11, two pieces were attached to both sides of the anode tray 1202 to give an adsorption force of 160 kg.
Then, the galvanic anode 1200 was installed by adsorbing the magnetic adsorption device 180 to the steel sheet pile 1001 as shown in FIG.
When the state was monitored after the installation of the current-carrying anode 1200, it was confirmed that the current-carrying anode 1200 was not dropped or displaced, and that the neodymium magnet 111 used in the magnetic adsorption device 180 was not corroded at all. It was done.

  Conventionally, an galvanic anode for cathodic protection has been attached to a steel sheet pile by underwater arc welding, but it has been confirmed that the resistance of the steel sheet pile at the welded portion deteriorates the resistance to earthquakes and the like. On the other hand, since the process with respect to the steel sheet pile 1001 is not required if the structure which attaches the electroplating anode 1200 using the magnetic adsorption apparatus 180 which concerns on this invention is employ | adopted, the problem of the strength reduction mentioned above will not arise.

  In addition, the magnetic adsorption device 180 can be attached if the surface of the steel sheet pile 1001 that is the object to be attracted has a smooth surface with a diameter of about 100 mm. It is difficult, and the galvanic anode 1200 can be easily installed, which greatly contributes to shortening the construction period.

  When the galvanic anode 1200 according to the present embodiment is attached, the quality of the welded part does not depend on the skill of the operator like underwater arc welding, and no special qualification is required for the welding work. Therefore, the galvanic anode 1200 of this example is extremely advantageous in terms of construction quality and work cost as compared with installation of the galvanic anode by underwater arc welding.

(Third embodiment)
Next, the third example is an example in which the galvanic anode is attached to the steel structure using the magnetic adsorption device 180 described above. Specifically, a current-carrying anode 1300 (aluminum alloy anode) for cathodic protection using the magnetic adsorption device 180 of the present invention was attached to a basket of a traveling screen (dustproof machine) which is a seawater intake facility of a power plant.

  FIG. 12A is a longitudinal sectional view of the galvanic anode according to the third embodiment. FIG.12 (b) is a top view in the Z direction arrow of Fig.12 (a). The cross-sectional structure shown in FIG. 12A corresponds to the position along the line H-H ′ in FIG.

  The galvanic anode 1300 shown in FIG. 12 includes a substantially trapezoidal anode body 1301 in cross section, a substantially ring-shaped attachment portion 1303 provided in the center of the anode body 1301 in plan view, and a substantially center in plan view of the attachment portion 1303. And a cushion member 1304 provided on the surface of the anode main body 1301 on which the magnetic adsorption device 180 is attached. The magnetic adsorption device 180 is fixed to a bolt hole formed in the portion.

The anode body 1301 is made of zinc, magnesium, or an alloy of these or aluminum, and typically an aluminum alloy is used. In this embodiment, an aluminum alloy anode having a weight of 26 kg is used.
The attachment portion 1303 is a steel ring-shaped member embedded in the anode main body 1301. One surface of the attachment portion 1303 (the surface on which the magnet of the magnetic adsorption device 180 is disposed) is exposed on the surface of the anode main body 1301, and the opposite surface is formed in the central portion of the anode main body 1301 in plan view. It is exposed in the through hole.
The magnetic adsorption device 180 is fastened to the attachment portion 1303 by inserting the screw shaft portion 186 into a bolt hole formed in the attachment portion 1303 and screwing a nut 180b into the screw shaft portion 186.
A cushion member 1304 made of an elastic material is provided so as to surround the magnetic adsorption device 180 protruding from the anode main body 1301. The cushion member 1304 covers one surface side of the anode main body 1301 other than the region where the magnetic adsorption device 180 is provided.

In this embodiment, since the weight of the anode main body 1301 is 26 kg, a magnetic adsorption device 180 that can obtain an adsorption force of 170 kg in the normal direction of the adsorption surface so that an adsorption force of 130 kg can be obtained with a safety factor of 5 times. One was used. After the painting of the basket was completed, the galvanic anode 1300 was adsorbed at the same position by removing the masking tape attached to the position where the anode was attached.
After installation, the installation state of the galvanic anode 1300 was monitored, and it was confirmed that the galvanic anode 1300 did not fall off even when the traveling screen was operated, and that the neodymium magnet of the magnetic adsorption device did not corrode at all. It was done.

  In this example, since the magnetic adsorption device 180 is adsorbed on the bottom surface of the basket and the galvanic anode 1300 is supported, the magnetic adsorption device 180 is oriented in the direction in which the adsorption force becomes strong (the load is in the normal direction of the adsorption surface). (In such an orientation). Therefore, as shown in FIG. 12, the galvanic anode 1300 can be configured by fixing one small magnetic adsorption device 180 on one surface side of the anode main body 1301. Therefore, according to the present invention, it is possible to reduce the size of the galvanic anode.

  In addition, the adoption of the magnetic adsorption device 180 makes it easy to attach and detach the galvanic anode and eliminates the mounting bracket protruding from the bottom of the basket, facilitating various maintenance work including painting, and shortening the time. Can be implemented.

(Fourth embodiment)
Next, 4th Example is an example which attached horizontally the incidental equipment provided with the magnetic adsorption apparatus 180 mentioned above with respect to the steel structure constructed | assembled in air | atmosphere.

Fig.13 (a) is a top view of the incidental equipment which concerns on 4th Example. FIG.13 (b) is a side view in the X direction arrow of Fig.13 (a).
Ancillary equipment 1400 shown in FIG. 13 is, for example, a measuring instrument storage box installed in a walkway portion of a steel bridge in a power plant. The incidental equipment 1400 has a rectangular cross section, and a magnetic adsorption device 180 is disposed on the bottom surface (installation surface) thereof.
In the case of the present embodiment, it is assumed that the size of the incidental equipment 1400 is 600 mm × 1200 mm × 400 mm and the weight is 30 kg. A magnetic adsorption device 180 capable of obtaining an adsorption force of 170 kg in the normal direction is fixed with bolts. The adsorption force obtained by the four magnetic adsorption devices 180 was 680 kg, and it was confirmed that even if the auxiliary equipment 1400 was pushed or hit after installation, it would not drop out or be displaced.

(5th Example)
Next, 5th Example is the example which attached the incidental installation provided with the previous magnetic adsorption apparatus 180 with respect to the steel structure constructed | assembled in air | atmosphere.

Fig.14 (a) is a top view of the incidental equipment which concerns on 5th Example. FIG.14 (b) is a side view in the Z direction arrow of Fig.14 (a).
Ancillary equipment 1500 shown in FIG. 14 is, for example, a signboard for guidance provided on a steel wall surface of a power plant building.
The signboard has a width of 2000 mm, a length of 4000 mm, and a height of 50 mm, and a mounting part 1501 made of steel (50 mm × 50 mm × 4.5 mm) is attached to the periphery. The weight of the auxiliary equipment 1500 is about 200 kg including accessories.
And in order to triple the safety factor in consideration of strong winds and earthquakes, and to obtain an adsorption force of 600 kg, eight magnetic adsorption devices 180 having an adsorption force of 80 kg in the vertical direction are provided around the signboard. It attached to 1501 and installed in the steel wall surface with the adsorption power of 640 kg.

  It was confirmed that the sign did not fall off or be displaced even if force was applied after installation. Moreover, since the steel wall surface targeted by the present embodiment is the outer peripheral portion of the machine and welding and drilling cannot be performed, by adopting a configuration that is attached using the magnetic adsorption device 180 as in the present embodiment, Conventionally, the signboard can be installed at a location where the signboard could not be installed, which is suitable as an application of the magnetic adsorption device according to the present invention.

  Note that the embodiments and examples of the present invention described above do not limit the technical scope of the present invention. That is, the corrosion-resistant magnet of the present invention can employ permanent magnets and anticorrosion members of various materials and various shapes within a range having a configuration including a permanent magnet and an anticorrosion member in contact with the permanent magnet. In addition, the magnetic attraction apparatus of the present invention can employ various shapes, yoke structures, and attachment structures to equipment as long as the corrosion-resistant magnet according to the present invention is provided.

The perspective view which shows the corrosion-resistant magnet which concerns on 1st Embodiment. Explanatory drawing of the corrosion progress model of a neodymium magnet. The figure which shows the magnetic adsorption apparatus which concerns on the 1st structural example of 2nd Embodiment. The figure which shows the magnetic adsorption apparatus which concerns on the 2nd structural example of 2nd Embodiment. The figure which shows the magnetic adsorption apparatus which concerns on the 3rd structural example of 2nd Embodiment. The figure which shows the magnetic adsorption apparatus which concerns on the 4th structural example of 2nd Embodiment. The figure which shows the magnetic adsorption apparatus which concerns on the 5th structural example of 2nd Embodiment. The figure which shows the usage condition of the magnetic adsorption apparatus which concerns on the 5th structural example of 2nd Embodiment. The figure which shows the magnetic adsorption apparatus which concerns on the 6th structural example of 2nd Embodiment. The figure which shows the usage condition of the magnetic attraction apparatus which concerns on the 6th structural example of 2nd Embodiment. The figure which shows the galvanic anode which concerns on 2nd Example. The figure which shows the galvanic anode which concerns on 3rd Example. The figure which shows incidental equipment which concerns on 4th Example. The figure which shows incidental equipment which concerns on 5th Example.

Explanation of symbols

  110, 120, 176 Corrosion resistant magnet, 111, 113 Neodymium magnet, 112, 114 Anticorrosion sheet, 130, 140, 150, 160, 170, 180 Magnetic adsorption device, 131, 151, 171, 181 Yoke, 132, 142a, 142b, 152, 162 Anticorrosion member, 133, 173, 183 Back yoke part, 134, 174, 184 Outer yoke part, 175, 185 Inner yoke part, 154 Side wall part, 178, 188 bolt, 179 Male thread part, 180a Adsorption device body, 180b Nut, 186 Screw shaft

Claims (8)

A method for preventing corrosion of a permanent magnet in an electrolyte solution,
A step of disposing an anticorrosive member including an anticorrosive material serving as a sacrificial anode of a constituent component of the permanent magnet in the electrolyte solution together with the permanent magnet in a state of being in direct contact with the permanent magnet;
The anticorrosion member has an anticorrosion sheet formed by extending the anticorrosion material into a sheet,
The permanent magnet is substantially circular,
The permanent magnet is disposed on the electrostatic Kaishitsu solution with the yoke and the anticorrosive member forms a magnetic circuit together with the permanent magnet,
The yoke includes a back yoke portion that adsorbs the permanent magnet, an outer yoke portion that is formed integrally with the back yoke portion and disposed on the outer peripheral surface side of the permanent magnet, and is formed integrally with the back yoke portion. Using the inner peripheral yoke portion disposed on the inner peripheral surface side of the permanent magnet,
The anticorrosion member is provided between the inner peripheral yoke portion and the permanent magnet and between the outer peripheral yoke portion and the permanent magnet.   The method for preventing corrosion of a permanent magnet according to claim 1, wherein the electrolyte solution is seawater.   The said permanent magnet and the said anticorrosion sheet | seat are adhere | attached through a conductive adhesive, The anticorrosion method of the permanent magnet of Claim 1 or 2 characterized by the above-mentioned.   The said electroconductive adhesive agent contains the powder of zinc or zinc alloy, The anticorrosion method of the permanent magnet of Claim 3 characterized by the above-mentioned.   The said permanent magnet contains iron, The said anticorrosion member contains the anticorrosion material used as the sacrificial anode of the said iron, The anticorrosion method of the permanent magnet of any one of Claim 1 to 4 characterized by the above-mentioned. The said permanent magnet is a permanent magnet represented by RE-Fe-MB, The corrosion prevention method of the permanent magnet of any one of Claim 1 to 4 characterized by the above-mentioned.
However, RE is at least one rare earth element selected from the group consisting of Nd, Y, La, Ce, Pr, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, and M is Co, Ti Nb, Al, V, Mn, Sn, Ca, Mg, Pb, Sb, Zn, Si, Zr, Cr, Ni, Cu, Ga, Mo, W, Ta, and at least one element selected from the group consisting of .   The anticorrosion method for a permanent magnet according to any one of claims 1 to 6, wherein a screw shaft portion protruding from the surface is provided on a surface of the back yoke portion opposite to the permanent magnet. Permanent magnet according to claim 7, characterized in that it Flip hole penetrating in the axial direction of the screw shaft and the back yoke part and the threaded shaft portion extends through the interior of the inner peripheral yoke portions Anticorrosion method.

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