JP4234731B2 - Lifting magnet - Google Patents

Description

  The present invention relates to a lifting magnet (a lifting electromagnet).

A lifting magnet is a device for lifting and transporting a steel material or the like by the magnetic force of an electromagnet. Patent Document 1 shows an example of a lifting electromagnet (lifting magnet). The lifting electromagnet includes an inner iron core, an outer iron core, an upper yoke, and an exciting coil.
JP 2004-168545 A

  As the lifting magnet, a magnet that can obtain a higher attractive force (magnetic force) with a small excitation current is preferable. However, in the case of conventional lifting magnets (lifting electromagnets), if the outer diameter of the magnet is widened to improve performance at a constant weight and the whole is flattened, part of the magnetic flux that should pass through the suspended load does not pass through the suspended load. It will leak to places other than suspended loads such as inside the coil. This has contributed to lowering the adsorption efficiency of the lifting magnet. On the other hand, in order to increase the adsorption efficiency, an inner electrode is provided between the inner iron core and the outer iron core, and the inner coil and the outer coil are separately supported by the coil support plate as the lower plate that supports the coil. In this case, a plurality of coil support plates are required, which increases the number of parts and the number of parts processed.

  The present invention has been made in view of the above problems, and provides a lifting magnet capable of reducing the leakage of magnetic flux and increasing the adsorption efficiency while suppressing an increase in the number of parts and the number of parts processed. Objective.

  The lifting magnet according to the present invention includes a ferromagnetic inner pole extending in a predetermined axial direction, a first coil wound around the inner pole around the predetermined axis, and around the first coil around the predetermined axis. A wound second coil, a ferromagnetic outer pole provided around the second coil around a predetermined axis, and a ferromagnetic intermediate pole provided between the first and second coils A non-magnetic and integral coil support plate provided on one end side of the first and second coils in a predetermined axial direction, the coil support plate being fixed to the inner pole, the outer pole, and the interposer It is characterized by being integrated. According to the above-described lifting magnet, since the magnetic pole is provided, the leakage of magnetic flux can be reduced and the magnetic flux can be efficiently passed through the suspended load. Therefore, the lifting magnet's adsorption efficiency compared to the conventional configuration Can be increased. In addition, since the coil support plate is configured as a single unit without being divided by the interposer, it is possible to suppress an increase in the number of parts and the number of parts processed, and to be integrally fixed to the inner pole, the outer pole, and the interposer. Therefore, durability can be improved. Furthermore, since the coil support plate can be supported not only by the inner and outer poles but also by the interposer, it is possible to reduce the thickness compared to the case where the diameter is increased by a lifting magnet having no interposer. Yes, the overall weight can be reduced.

  The coil support plate may have a through hole at a position corresponding to the interpole. If it does in this way, a coil support plate can be fixed to an intermediate pole from the outside, for example by welding etc. through a penetration hole.

  The lifting magnet includes a yoke provided on the other end side different from the one end sides of the first and second coils in a predetermined axial direction, and the yoke has a through hole at a position corresponding to the interpole. Also good. If it does in this way, after fixing a coil support plate to an interpole from inner side, for example by welding etc. and accommodating a coil, a yoke can be fixed to an interpole from the outside through a through-hole, for example by welding.

  The interpole may be accommodated in the coil support plate so as not to be exposed to the outside. In this way, a flat suction surface can be taken widely, and the suspended load can be in close contact and the amount of suspended load can be increased. Therefore, the adsorption efficiency of the lifting magnet can be effectively increased.

  The interpole has a plurality of interpolar convex portions provided so as to partially protrude in a predetermined axial direction, and the coil support plate has a plurality of insertion holes through which the plurality of interpolar convex portions pass. The polar convex portion may be characterized by being exposed to the outside through the insertion hole of the coil support plate. The coil support plate can be firmly fixed to the interpole by fixing the exposed interelectrode convex portion and the coil support plate by, for example, welding.

  According to the lifting magnet of the present invention, it is possible to reduce the leakage of magnetic flux and increase the adsorption efficiency while suppressing the increase in the number of parts and the number of parts processed.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.
(First embodiment)

  Fig.1 (a) is side sectional drawing which shows the structure of the lifting magnet 1a which concerns on 1st embodiment. Moreover, FIG. 2 is sectional drawing which shows the cross section along the II-II line of the lifting magnet 1a shown to Fig.1 (a). In addition, the lifting magnet 1a of this embodiment has a cylindrical appearance centering on the axis C, and illustration of the cross section of one side with respect to the axis C is abbreviate | omitted in Fig.1 (a).

  Referring to FIGS. 1A and 2, the lifting magnet 1 a according to the present embodiment includes a case 10, coils 20 and 21, and fixing members 41 and 42. The coil 20 is a first coil in the present embodiment, and is formed by winding a conducting wire around an inner pole 12 described later. The coil 21 is a second coil in the present embodiment, and is formed by winding a conductive wire around the coil 20.

  Here, FIG.1 (b) is an enlarged view which shows the structure of the partial cross section (A1 and A2 in a figure) of the coils 20 and 21 in detail. The coils 20 and 21 have a conducting wire 22 and an insulating coating film 23. The conducting wire 22 is wound around the central axis C across a plurality of layers. The conducting wire 22 is made of a conductive material such as aluminum. The insulating coating film 23 is made of, for example, insulating paper and covers the conductive wire 22. In addition, the conducting wire 22 of the coil 20 and the conducting wire 22 of the coil 21 may be connected to each other or may be independent from each other.

  The case 10 is a member for housing the coils 20 and 21. The case 10 includes a coil support plate 15 as a bottom plate disposed on one end side of the coils 20 and 21, a yoke 11 as a top plate disposed on the other end side of the coils 20 and 21, and an inner side of the coil 20. The inner pole 12 is formed, the outer pole 13 disposed outside the coil 21, and the interpole 14 provided between the coils 20 and 21. The yoke 11, the inner pole 12, the outer pole 13, and the interpole 14 are each made of a ferromagnetic material such as iron.

  The inner pole 12 is a rod-shaped member that extends in the winding axis direction of the coil 20 along the inner side surface 20 b of the coil 20 (that is, a predetermined direction along the central axis C), and constitutes a first electromagnet together with the coil 20. . That is, when an exciting current flows through the coil 20, a magnetic field is formed inside the inner pole 12, and the end portion 12a on one end side of the inner pole 12 becomes one pole of the first electromagnet. The end 12a is configured to be removable from the case 10, and is exchanged according to wear.

  The interpole 14 is a cylindrical member extending in the predetermined direction along the outer side surface 20 c of the coil 20 and the inner side surface 21 b of the coil 21, and constitutes a second electromagnet together with the coil 21. That is, when an exciting current flows through the coil 21, a magnetic field is formed inside the interpole 14, and the end portion 14a on one end side of the interpole 14 becomes one pole of the second electromagnet. As shown in FIG. 2, the intermediate pole 14 of the present embodiment is provided in an annular shape that is continuous over the entire circumference of the coils 20 and 21.

  The outer pole 13 is a cylindrical member that extends in the predetermined direction along the outer surface 21 c of the coil 21. When an exciting current flows through the coils 20 and 21, a magnetic field is formed inside the outer pole 13, and the end 13a on one end side of the outer pole 13 becomes the other pole of the first and second electromagnets. The end portion 13a is configured to be removable from the case 10 similarly to the end portion 12a of the inner pole 12, and is replaced in accordance with wear. The lower ends of the end portions 12a and 13a (that is, one end of the inner pole 12 and the outer pole 13) are located in the same plane. For example, when the suction surface of the suspended load is a plane, the end portions 12a and 13a are Abuts on the attracted surface.

  The coil support plate 15 is an integral disk-shaped member provided along the end surface 20 a on one end side of the coil 20 and the end surface 21 a on one end side of the coil 21. The coil support plate 15 is made of, for example, a non-magnetic material such as high manganese austenitic steel or Ni—Cr austenitic stainless steel so as not to disturb the magnetic fields in the magnetic poles 12 to 14.

  As shown in FIG. 3, the coil support plate 15 has an opening 15 a through which the inner pole 12 penetrates in the center, and one end of the inner pole 12 is exposed downward from the coil support plate 15. In addition, the coil support plate 15 has a plurality of through holes 15b to be fixed to the interelectrode 14a at positions corresponding to the interelectrode 14 as shown by a one-dot chain line in FIG. These through holes 15b are provided at equal intervals around the central axis C between the interpole inner peripheral surface 14b and the interpole outer peripheral surface 14c. The outer peripheral portion (edge portion 15 c) of the coil support plate 15 is fixed to the outer pole 13, and the inner peripheral portion (edge portion 15 a) is fixed to the inner pole 12. Further, the intermediate portion of the coil support plate 15 is fixed to the interpole 14 through the through hole 15b. Thereby, the inner pole 12, the outer pole 13, the interpole 14 and the coil support plate 15 are integrated. As a method of fixing each of the poles 12 to 14 and the coil support plate 15, welding, bolting, or the like is preferable.

  The yoke 11 is an integral disk-shaped member provided along the end surface 20 d on the other end side of the coil 20 and the end surface 21 d on the other end side of the coil 21. The other end of the inner pole 12 is fixed to the central portion of the yoke 11, the other end of the outer pole 13 is fixed near the outer peripheral portion of the yoke 11, and the other end of the interpole 14 is connected to the central portion of the yoke 11. It is fixed to an intermediate part between the outer peripheral part. In addition, welding, bolting, etc. are suitable as a fixing method of each of these poles 12 to 14 and the yoke 11. When an exciting current flows through the coils 20 and 21, the magnetic flux passes through the inside of the yoke 11. Thereby, a magnetic field can be efficiently generated at the end portions 12a, 13a, and 14a of the inner pole 12, the outer pole 13, and the interpole 14.

  4A to 4C are side cross-sectional views showing the assembly process of the lifting magnet shown in FIG. First, as shown in FIG. 4A, the inner pole 12, the outer pole 13, and the interpole 14 are fixed to the yoke 11 by welding, for example. Next, as shown in FIG. 4B, the coil 20 is placed between the inner pole 12 and the interpole 14, and the coil 21 is placed between the interpole 14 and the outer pole 13 with fixing members 41 and 42, respectively. Fix it. Finally, as shown in FIG. 4C, the coil support plate 15 is fixed to the interelectrode 14 through, for example, welding through the through hole 15b. Then, the inner extreme portion 12a is disposed on the end face of the inner pole 12, and the outer extreme portion 13a is disposed on the end face of the outer pole 13, and these are fixed by welding or the like.

  As described above, the lifting magnet 1a according to this embodiment includes the ferromagnetic inner pole 12 extending in the direction of the central axis C, the coil 20 wound around the inner pole 12 around the central axis C, and the central axis. The coil 21 wound around the coil 20 around C, the ferromagnetic outer pole 13 provided around the coil 21 around the central axis C, and the ferromagnetic provided between the coils 20, 21. And a non-magnetic and integral coil support plate 15 provided on one end side of the coils 20 and 21 in the central axis C direction. The coil support plate 15 includes an inner pole 12, an outer pole 13, And it is fixed to the interelectrode 14 and integrated. Therefore, by providing the interpole 14, the leakage of magnetic flux can be reduced and the magnetic flux can be efficiently passed through the suspended load, so that the adsorption efficiency of the lifting magnet can be increased as compared with the conventional configuration. In addition, since the coil support plate 15 is configured as an integral part without being divided by the interelectrode 14, it is possible to suppress an increase in the number of parts and the number of parts processed, and the inner pole 12, the outer pole 13, and the interposer 14. Since it is fixed to and integrated with each other, durability can be improved. Furthermore, since the coil support plate 15 is supported not only by the inner pole 12 and the outer pole 13 but also by the intermediate pole 14 as described above, the thickness can be reduced compared to the conventional case, and the overall weight can be reduced. .

Further, since the coil support plate 15 has the through hole 15b at a position corresponding to the interelectrode 14, the coil support plate 15 can be fixed to the interelectrode 14 from the outside through the through hole 15b, for example, by welding. Therefore, the coil support plate 15 can be firmly fixed to the interelectrode 14.
(Second embodiment)

  Next, the lifting magnet 1b according to the second embodiment will be described.

  FIG. 5 is a side sectional view showing the configuration of the lifting magnet 1b according to the second embodiment. The lifting magnet 1b of the present embodiment is different from the lifting magnet 1a of the above-described embodiment in the configuration of the yoke 11 and the coil support plate 15. Since the configuration other than these differences is the same as that of the above embodiment, detailed description thereof is omitted.

  The yoke 11 has a plurality of through-holes 11b at positions corresponding to the interelectrode 14 as shown by a one-dot chain line in FIG. These through holes 11b are provided at equal intervals around the central axis C at an intermediate portion between the interpole inner peripheral surface 14b and the interpole outer peripheral surface 14c. On the other hand, the coil support plate 15 does not have the through hole 15b as in the first embodiment.

  7A to 7C are side cross-sectional views showing the assembly process of the lifting magnet 1b shown in FIG. First, as shown in FIG. 7A, the inner pole 12 is arranged on the inner extreme portion 12a and the outer pole 13 is arranged and fixed on the outer extreme portion 13a. And what fixed the interposition pole 14 to the coil support plate 15 is arrange | positioned between the inner pole 12 and the outer pole 13, and is fixed by welding, for example. Next, as shown in FIG. 7B, the coil 20 is placed between the inner pole 12 and the interpole 14, and the coil 21 is placed between the interpole 14 and the outer pole 13 with fixing members 41 and 42, respectively. Fix it. Finally, as shown in FIG. 7C, the yoke 11 is fixed to the inner pole 12 and the outer pole 13 from the outside, and is fixed to the intermediate pole 14 through the through hole 11b.

  As described above, the lifting magnet 1b according to the present embodiment also includes the interpole 14 so that the leakage of the magnetic flux can be reduced and the magnetic flux can be efficiently passed through the suspended load. The adsorption efficiency of the lifting magnet can be increased. In addition, since the coil support plate 15 is configured as an integral part without being divided by the interelectrode 14, it is possible to suppress an increase in the number of parts and the number of parts processed, and the inner pole 12, the outer pole 13, and the interposer 14. Since it is fixed to and integrated with each other, durability can be improved. Furthermore, since the coil support plate 15 is supported not only by the inner pole 12 and the outer pole 13 but also by the intermediate pole 14 as described above, the thickness can be reduced compared to the conventional case, and the overall weight can be reduced. .

Further, since the yoke 11 has the through hole 11b at a position corresponding to the interelectrode 14, the coil support plate 15 is fixed to the interelectrode 14 from the inside by welding or the like, and after the coils 20, 21 are accommodated, The yoke 11 can be fixed to the intermediate electrode 14 from the outside through, for example, welding through the hole 11b. Therefore, the case 10 can be assembled after the coil support plate 15 is firmly fixed from the inside, and the coil support plate 15 and the interelectrode 14 can be firmly fixed.
(Third embodiment)

  Next, the lifting magnet 1c according to the third embodiment will be described.

  FIG. 8 is a side sectional view showing the configuration of the lifting magnet 1c according to the present embodiment. FIG. 9 is a cross-sectional view showing a cross section along line IX-IX of the lifting magnet 1c shown in FIG. 8 and 9, the structural difference between the lifting magnet 1c of the present embodiment and the first embodiment is the shapes of the coil support plate 15 and the interpole 16. Since the configuration other than these differences is the same as that of the above embodiment, detailed description thereof is omitted.

  FIG. 10 is a plan view showing a coil support plate of the lifting magnet 1c shown in FIG. The coil support plate 15 of the present embodiment has an insertion hole 15d having a cross section that matches the cross sectional shape of the interpolar protrusions 16A to 16C, instead of the through hole of the first embodiment.

  FIG. 11 is a perspective view showing the intermediate pole 16 of the lifting magnet shown in FIG. As shown in FIG. 11, the intermediate pole 16 of this embodiment is different from the intermediate pole of the first embodiment, and has a plurality of intermediate pole protrusions 16 </ b> A to 16 </ b> C having a shape protruding from the end surface in the central axis C direction. . Returning to FIG. 8 and FIG. 9, the interpole 16 is arranged in the case 10 so that the interpole protrusions 16 </ b> A to 16 </ b> C extend to the side of the coil 20, 21 in the direction of the central axis C direction. During this time, the ends of the pole projections 16 </ b> A to 16 </ b> C that face the suspended load are exposed to the suspended load through the insertion holes 15 d of the coil support plate 15. When an exciting current flows through the coil 21, a magnetic field is formed inside the interpole 16, and the load-side end surface of the interpole 16 including the interpole convex portions 16A to 16C becomes the pole of the electromagnet. A fixing material 43 such as a resin is embedded in a gap provided between the interpolar protrusions 16A to 16C. The fixing member 43 fixes the coils 20 and 21 in the case 10.

  As described above, in the lifting magnet 1 c according to the present embodiment, the interpole 16 has the plurality of interpolar protrusions 16 </ b> A to 16 </ b> C provided so as to partially protrude in the direction of the central axis C, and the coil support plate 15. Has a plurality of insertion holes 15 d through which the plurality of interpolar protrusions 16 </ b> A to 16 </ b> C pass, and the interpolar protrusions 16 </ b> A to 16 </ b> C are exposed to the outside through the insertion holes 15 d of the coil support plate 15. The coil support plate 15 can be firmly fixed to the interpolar electrode 16 by fixing the protruding interelectrode convex portions 16A to 16C and the coil support plate 15 by welding or the like, for example.

  The lifting magnet according to the present invention is not limited to the above-described embodiment, and various other modifications are possible. For example, in the above-described embodiment, the configuration in which one interelectrode is provided between the inner electrode and the outer electrode has been described. However, the interelectrode of the present invention may be provided in a plurality of layers between the inner electrode and the outer electrode. good. In this case, three or more coils are provided between the poles. Moreover, in the said embodiment, although the case where the end of an interpole was on the same plane as the end of an inner pole and an outer pole, the length (height) of an interpole was the length of an inner pole and an outer pole ( (Height) may be shorter. Furthermore, in the first embodiment, the inner pole 12, the outer pole 13 and the interpole 14 are individually fixed to the yoke 11. However, the inner pole 12, the outer pole 13, the interposer 14 and the yoke 11 are They may be integrated into a single casting.

(A) is side surface sectional drawing which shows the structure of the lifting magnet which concerns on 1st embodiment. (B) is an enlarged view which shows the structure of the partial cross section of a coil in detail. It is sectional drawing which shows the cross section along the II-II line of the lifting magnet shown to Fig.1 (a). It is a top view which shows the coil support plate of the lifting magnet shown in FIG. It is side surface sectional drawing which shows the assembly process of the lifting magnet shown in FIG. It is side surface sectional drawing which shows the structure of the lifting magnet which concerns on 2nd embodiment. It is a top view which shows the yoke of the lifting magnet shown in FIG. It is side surface sectional drawing which shows the assembly process of the lifting magnet shown in FIG. It is side surface sectional drawing which shows the structure of the lifting magnet which concerns on 3rd embodiment. It is sectional drawing which shows the cross section along the IX-IX line of the lifting magnet shown in FIG. It is a top view which shows the coil support plate of the lifting magnet shown in FIG. FIG. 9 is a perspective view showing an intermediate pole of the lifting magnet shown in FIG. 8.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a, 1b, 1c ... Lifting magnet, 10 ... Case, 11 ... Yoke, 11b ... Through-hole, 12 ... Inner pole, 13 ... Outer pole, 14, 16 ... Interpole, 16A-C ... Interpole convex part, 15 ... Coil support plate, 15b ... through hole, 15d ... insertion hole, 20, 21 ... coil, 22 ... conductive wire, 23 ... insulation coating film, 41-43 ... fixing material, C ... center axis.

Claims (5)

A ferromagnetic inner pole extending in a predetermined axial direction;
A first coil wound around the inner pole around the predetermined axis;
A second coil wound around the first coil around the predetermined axis;
A ferromagnetic outer pole provided around the second coil around the predetermined axis;
A ferromagnetic pole provided between the first and second coils;
A non-magnetic and integral coil support plate provided on one end side of the first and second coils in the predetermined axial direction;
The lifting magnet according to claim 1, wherein the coil support plate is fixed and integrated with the inner pole, the outer pole, and the intermediate pole.   The lifting magnet according to claim 1, wherein the coil support plate has a through hole at a position corresponding to the interpole. A yoke provided on the other end side different from the one end side of the first and second coils in the predetermined axial direction;
The lifting magnet according to claim 1, wherein the yoke has a through hole at a position corresponding to the intermediate electrode.   The lifting magnet according to any one of claims 1 to 3, wherein the interpole is housed inside the coil support plate so as not to be exposed to the outside. The interpole has a plurality of interpolar protrusions provided so as to partially protrude in the predetermined axial direction,
The coil support plate has a plurality of insertion holes through which the plurality of inter-polar protrusions pass.
The lifting magnet according to claim 1, wherein the interpolar protrusion is exposed outwardly through the insertion hole of the coil support plate.

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