JP6320778B2 - Lifting magnet - Google Patents

Description

  The present invention relates to a lifting magnet.

  As a conventional lifting magnet, the one described in Patent Document 1 is known. The lifting magnet includes an electromagnet having an inner pole and an outer pole extending in a direction orthogonal to the extending direction of the pipe, and a plurality of pipes can be lifted by arranging the electromagnets in the orthogonal direction.

Japanese Utility Model Publication No. 7-024871

  Here, in the above-described lifting magnet, the lower end surface of the outer pole and the lower end surface of the inner pole function as adsorption surfaces. In this lifting magnet, when the round pipe is lifted, the lifting magnet's attracting surface and the round pipe are in line contact with each other, and the magnetic flux is also generated in the gap between the circular pipe and the arc portion of the round pipe that is not in contact with the lifting magnet. In order to pass through, a deep magnetic flux depth is required. When lifting a square pipe or sheet material with a thin plate thickness using a lifting magnet with such a deep magnetic flux depth, it can be lifted suitably because the magnetic path cross-sectional area of the object to be lifted is small and the magnetic flux density is low. There is a possibility of disappearing. In addition, when lifting a desired amount of the object to be lifted from a state in which the object to be lifted is stacked in multiple stages, the magnetic flux reaches the object to be lifted on the lower side, so that it is lifted more than the desired amount. There is a possibility that.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a lifting magnet that can be reliably lifted regardless of the type of the object to be lifted.

  The lifting magnet according to the present invention is a lifting magnet having a plurality of electromagnets arranged in the first direction, and the electromagnet is provided between the pair of outer poles extending in the first direction and the pair of outer poles. , An inner pole extending in the first direction, a coil wound around the inner pole, and a magnetic part provided so as to be in contact with the inner pole, the magnetic part being a first surface formed as an attracting surface And a second surface, a space is formed between the first surface and the second surface, and the first surface and the second surface are perpendicular to the first direction. 2 spaced apart via a space.

  In the lifting magnet according to the present invention, the magnetic part of the electromagnet has a first surface and a second surface that are formed as attracting surfaces. A space is formed between the first surface and the second surface. Therefore, by dividing the suction surface into two surfaces, the area of each suction surface can be reduced. The first surface and the second surface are separated from each other via a space portion in a second direction orthogonal to the first direction, which is a direction in which the outer pole and the inner pole extend. With such a configuration, the first surface can be disposed at a position close to one outer pole, and the second surface can be disposed at a position close to the other outer pole. Therefore, the depth of the magnetic flux can be reduced, and the magnetic flux density can be increased (relative to a thin object to be lifted). Thereby, it can be reliably lifted irrespective of the kind of thing to be lifted.

  In the lifting magnet according to the present invention, each of the first surface, the second surface, and the space portion extends in the first direction, and the maximum width of the magnetic portion in the second direction is the inner width in the second direction. It may be larger than the maximum width of the pole. Accordingly, the first surface can be arranged at a position close to one outer pole, the size in the first direction can be secured large, and the second face can be arranged at a position close to the other outer pole. And a large size in the first direction can be secured.

  In the lifting magnet according to the present invention, a notch that is recessed inward may be formed at an end of the magnetic portion in the first direction. Since the vicinity of the end in the first direction of the magnetic portion includes a region where the magnetic flux does not need to flow, the magnetic flux can be efficiently flowed to the first surface and the second surface by forming the notch portion. .

  In the lifting magnet according to the present invention, a plurality of electromagnets may be arranged in the second direction. As a result, even if the object to be lifted is long in the second direction, the object to be lifted can be reliably lifted by being attracted by the attracting surfaces of the plurality of electromagnets.

  The lifting magnet according to the present invention is a lifting magnet having a plurality of electromagnets arranged in the first direction, and the electromagnet is provided between the pair of outer poles extending in the first direction and the pair of outer poles. , An inner pole extending in the first direction, a coil wound around the inner pole, and a magnetic part provided so as to be in contact with the inner pole, the magnetic part being a first surface formed as an attracting surface And the distance between the first surface and one outer pole is smaller than the distance between the inner pole and one outer pole, and the second surface and the other outer surface. The distance between the poles is smaller than the distance between the inner pole and the other outer pole.

  In the lifting magnet according to the present invention, the magnetic part of the electromagnet has a first surface and a second surface that are formed as attracting surfaces. Therefore, by dividing the suction surface into two surfaces, the area of each suction surface can be reduced. The distance between the first surface and one outer pole is smaller than the distance between the inner pole and one outer pole, and the distance between the second surface and the other outer pole is Smaller than the distance between the inner pole and the other outer pole. With such a configuration, the first surface can be disposed at a position close to one outer pole, and the second surface can be disposed at a position close to the other outer pole. Therefore, the depth of the magnetic flux can be reduced, and the magnetic flux density can be increased (for a thin object to be lifted). Thereby, it can be reliably lifted irrespective of the kind of thing to be lifted.

  According to the present invention, the object can be reliably lifted regardless of the type of the object to be lifted.

It is the schematic which shows a lifting magnet apparatus provided with the lifting magnet which concerns on embodiment of this invention. It is a bottom view of the lifting magnet which concerns on embodiment of this invention. It is the elements on larger scale of the lifting magnet shown in FIG. 4A is a cross-sectional view taken along line IVA-IVA shown in FIG. 3, and FIG. 4B is a cross-sectional view taken along line IVB-IVB shown in FIG. 4A. FIG. 5A is a side view showing a state where the lifting magnet according to the embodiment of the present invention lifts the square pipe, and FIG. 5B shows a region where the lifting magnet according to the embodiment of the present invention contacts the upper surface of the square pipe. FIG. 5C is a side view showing a state where the lifting magnet according to the embodiment of the present invention lifts the round pipe, and FIG. 5D shows the lifting magnet according to the embodiment of the present invention. It is a bottom view which shows the area | region which contacts. 6A is a side view showing a state in which the lifting magnet according to the comparative example lifts the square pipe, and FIG. 6B is a bottom view showing a region where the lifting magnet according to the comparative example contacts the upper surface of the square pipe. 6C is a side view showing a state where the lifting magnet according to the comparative example lifts the round pipe, and FIG. 6D is a bottom view showing a region where the lifting magnet according to the comparative example contacts the upper end of the round pipe. FIG. 7A is a schematic diagram illustrating a state of the magnetic flux of the electromagnet of the lifting magnet according to the embodiment of the present invention, and FIG. 7B is a schematic diagram illustrating a state of the magnetic flux of the electromagnet of the lifting magnet according to the comparative example. 8A to 8D are bottom views showing the configuration of the magnetic part of the lifting magnet according to the modification.

  Hereinafter, an embodiment of a lifting magnet according to the present invention will be described in detail 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. In the following description, the terms “upper” and “lower” are used with reference to the posture when the lifting magnet attracts and lifts the object to be lifted. The “direction D1 (first direction)” “direction D2 (second direction)” parallel to the attracting surface of the lifting magnet and the “vertical direction D3” perpendicular to the attracting surface are defined and described below. I do. The direction D2 is a direction orthogonal to the direction D1.

  As shown in FIG. 1, the lifting magnet device 50 includes a suspended beam 51 and a lifting magnet 1 suspended from the suspended beam 51. The lifting magnet device 50 is for attracting the object W to be lifted by the magnetic force of the lifting magnet 1 and lifting the object W to be lifted. In the present embodiment, the suspended object W is not particularly limited as long as it can be adsorbed by a magnetic force, and is, for example, an iron plate, an iron bar, a round pipe, a square pipe, or the like. In particular, the lifting magnet 1 according to the present embodiment can be lifted satisfactorily regardless of whether it is a round pipe or a square pipe. When a round pipe or a square pipe extending in the direction D2 is adopted as the suspended object W, a plurality of lifting magnets 1 are suspended in the state of being arranged in the direction D1.

  As shown in FIG. 2, the lifting magnet 1 includes an electromagnet unit 3 in which a plurality of electromagnets 2 are arranged in a direction D2. The lifting magnet 1 is configured by arranging a plurality of electromagnet units 3 so as to be adjacent to each other in the direction D1. With such a configuration, the lifting magnet 1 has a plurality of electromagnets 2 arranged in the direction D1 and the direction D2.

  As shown in FIGS. 2 to 4, one electromagnet 2 is provided between a pair of outer poles 4 extending in the direction D1, an inner pole 6 extending between the pair of outer poles 4 and extending in the direction D1, and an outer pole. 4 and an inner pole 6, a yoke 7 connected to the inner pole 6, a coil 8 wound around the inner pole 6, and a magnetic part 9 provided so as to be in contact with the inner pole 6. The electromagnet unit 3 has a long rectangular plate-like yoke 7 extending in the direction D2. The outer pole 4 and the inner pole 6 are provided alternately along the direction D2 with respect to the yoke 7.

  As shown in FIG. 4A, the outer pole 4 is provided so as to extend downward from the lower surface of the yoke 7. One outer pole 4 and the other outer pole 4 are disposed so as to face each other in parallel at a position spaced in the direction D2. The inner pole 6 is provided between the pair of outer poles 4 so as to extend downward from the lower surface of the yoke 7. The inner pole 6 is disposed at a central position between the pair of outer poles 4 and is disposed so as to face each outer pole 4 in parallel at a position spaced from each outer pole 4 in the direction D2. The coil 8 is configured by winding a conducting wire around the inner pole 6 over a plurality of layers. A conductive material such as aluminum or copper is applied as the conductive wire constituting the coil 8. A bottom plate is provided below the coil 8. The bottom plate is for preventing the coil 8 from being damaged by hitting the suspended object W or dust. The bottom plate is formed of a nonmagnetic member such as high manganese austenitic steel or Ni—Cr austenitic stainless steel. The magnetic part 9 is provided at the lower end of the inner pole 6. Details of the configuration of the magnetic unit 9 will be described later. The outer pole 4, the inner pole 6, the yoke 7 and the magnetic part 9 are each made of a magnetic material such as iron, pure iron, or an iron alloy. With this configuration, when an exciting current flows through the coil 8, a magnetic field is formed inside the inner pole 6 and the magnetic part 9, and the magnetic part 9 becomes one pole of the electromagnet. When an exciting current flows through the coil 8, a magnetic field is formed inside the outer pole 4, and the outer pole 4 becomes the other pole. Note that the electromagnets 2 adjacent in the direction D2 share one outer pole 4.

  Next, the configuration in the vicinity of the magnetic part 9 will be described in detail with reference to FIGS. As shown in FIGS. 3 and 4, the magnetic portion 9 includes a rectangular plate-like portion 21 extending in the direction D1, and protrusions 22A and 22B protruding downward from both ends in the direction D2 of the rectangular plate-like portion 21. It has. The upper end of the rectangular plate portion 21 is connected to the lower end of the inner pole 6. Further, the rectangular plate-like portion 21 is arranged so that the center position in the direction D1 and the center position in the direction D2 coincide with the inner pole 6. The protruding portions 22A and 22B extend in the direction D1 along the respective end portions of the rectangular plate-shaped portion 21. As a result, a groove 13 extending in the direction D1 from one end to the other end in the direction D1 of the magnetic part 9 is formed between the protrusion 22A and the protrusion 22B. With such a configuration, the magnetic part 9 has the first surface 12A and the second surface 12B formed as adsorption surfaces at the lower ends of the protrusions 22A and 22B. The first surface 12A and the second surface 12B are disposed at the same position in the vertical direction D3 as the lower end surface 11 of the outer pole 4 formed as an attracting surface. The lower end surface 11 of the outer pole 4 is a surface that extends so as to extend in the direction D1. In addition, the first surface 12A and the second surface 12B are surfaces that extend so as to extend in the direction D1. In addition, by forming the groove 13 between the protrusions 22A and 22B, a space 14 is formed between the first surface 12A and the second surface 12B. Accordingly, the first surface 12A and the second surface 12B are separated from each other via the space portion 14 in the direction D2. Since both end portions of the magnetic portion 9 in the direction D2 are separated from the outer pole 4, the first surface 12A and the lower end surface 11 of the one outer pole 4 are separated from each other in the direction D2 via a space portion. To do. Further, the second surface 12B and the lower end surface 11 of the other outer pole 4 are separated from each other in the direction D2 via a space portion. In the direction D2, the first surface 12A is disposed on the one outer pole 4 side, and the second surface 12B is disposed on the other outer pole 4 side.

  As shown in FIG. 3, the maximum width W2 in the direction D2 of the magnetic part 9 is larger than the maximum width W1 of the inner pole 6 in the direction D2. Accordingly, both end portions in the direction D2 of the magnetic portion 9 protrude outward from both end portions in the direction D2 of the inner pole 6. Accordingly, a part of the first surface 12 </ b> A is disposed outside one end portion in the direction D <b> 2 of the inner pole 6, that is, on the lower end surface 11 side of the outer pole 4. A part of the second surface 12 </ b> B is disposed outside the other end in the direction D <b> 2 of the inner pole 6, that is, on the lower end surface 11 side of the outer pole 4. In FIG. 3, a part of the first surface 12A and the second surface 12B is disposed outside the inner pole 6, but the first surface 12A and the second surface 12B are all the inner pole. It may be arranged outside 6.

  Further, the maximum width L2 of the magnetic part 9 in the direction D1 is larger than the maximum width L1 of the inner pole 6 in the direction D1. Therefore, both end portions in the direction D1 of the magnetic portion 9 protrude outward from both end portions in the direction D1 of the inner pole 6. Accordingly, a part of the first surface 12A is disposed outside the one end portion in the direction D1 of the inner pole 6. A part of the second surface 12B is disposed outside the other end portion in the direction D1 of the inner pole 6. Thereby, the dimension G of the gap between the end of the magnetic part 9 of one electromagnet unit 3 and the end of the magnetic part 9 of the electromagnet unit 3 adjacent in the direction D1 is two electromagnet units adjacent in the direction D1. 3 is smaller than the dimension of the gap between the inner poles 6. As a result, the first surface 12A and the second surface 12B as suction surfaces can be widely secured in the direction D1. The dimension G is preferably set to such a size that the round pipe can be attracted to the attracting surface even when the round pipe is in contact with the magnetic part 9 in the vicinity of the gap. On the other hand, the dimension G is set to such an extent that the adjacent magnetic parts 9 do not contact each other. For example, when energizing only some of the electromagnet units 3 and using them, it is possible to prevent magnetic flux from leaking to the magnetic part 9 of the adjacent electromagnet unit 3.

  In addition, notches 16 that are recessed inward are formed at both ends of the magnetic part 9 in the direction D1. The notch portion 16 is a region between the protruding portion 22A and the protruding portion 22B in the rectangular plate-shaped portion 21 of the magnetic portion 9, and is a region protruding outward from the end portion in the direction D1 of the inner pole 6. Formed. The notch 16 is formed so as to draw a V shape when viewed in the up-down direction D3. In FIG. 3, the notch 16 is inclined from the corner of one protrusion 22A toward the center line of the magnetic part 9, and from the corner of the other protrusion 22B toward the center line of the magnetic part 9. And is configured to be inclined. The tip of the notch 16 extends to the inner pole 6, but may extend to the outside of the inner pole 6 and may extend to the inner side of the inner pole 6.

  Next, the operation and effect of the lifting magnet 1 according to this embodiment will be described.

  First, a lifting magnet according to a comparative example will be described with reference to FIG. 7B. In the lifting magnet shown in FIG. 7B, the entire lower end surface 29A of the inner pole 6 functions as an attracting surface. In this lifting magnet, since the area of the attracting surface of the inner pole 6 is wide, the depth of the magnetic flux is increased (for a thin object to be lifted) and the magnetic flux density is reduced. Here, when the magnetic flux is deep, no problem arises when the round pipe is lifted. In other words, when lifting the round pipe, the lifting magnet's attracting surface and the round pipe will be in line contact, and the magnetic flux will also pass through the gap between the circular pipe's arc not in contact with the lifting magnet. Deep magnetic flux depth is required. When lifting a square pipe or sheet material with a thin plate thickness using a lifting magnet with such a deep magnetic flux depth, it can be lifted suitably because the magnetic path cross-sectional area of the object to be lifted is small and the magnetic flux density is low. There is a possibility of disappearing. In addition, when lifting a desired amount of the object to be lifted from a state in which the object to be lifted is stacked in multiple stages, the magnetic flux reaches the object to be lifted on the lower side, so that it is lifted more than the desired amount. There is a possibility that.

  On the other hand, in the lifting magnet 1 according to the present embodiment, as shown in FIG. 7A, the magnetic part 9 of the electromagnet 2 has a first surface 12A and a second surface 12B formed as attracting surfaces. A space 14 is formed between the first surface 12A and the second surface 12B. Therefore, by dividing the suction surface into two surfaces, the area of each suction surface can be reduced. Further, the first surface 12A and the second surface 12B are separated from each other via the space portion 14 in a direction D2 orthogonal to the direction D1 in which the outer pole 4 and the inner pole 6 extend. Further, the distance between the first surface 12A and the one outer pole 4 is smaller than the distance between the inner pole 6 and the one outer pole 4, and the second surface 12B and the other outer pole 4 are. Is smaller than the distance between the inner pole 6 and the other outer pole 4. With such a configuration, the first surface 12 </ b> A can be disposed at a position close to one outer pole 4, and the second surface 12 </ b> B can be disposed at a position close to the other outer pole 4. Therefore, compared to the comparative example shown in FIG. 7B, the depth of the magnetic flux can be reduced, and the magnetic flux density can be increased (for a thin object to be lifted). The plate member can be suitably lifted. Moreover, only a desired amount can be lifted. Thereby, it can be reliably lifted irrespective of the kind of the thing W to be lifted.

  In the lifting magnet 1 according to this embodiment, the first surface 12A, the second surface 12B, and the space portion 14 each extend in the direction D1, and the maximum width of the magnetic portion 9 in the direction D2 is the inner width in the direction D2. It is larger than the maximum width of the pole 6. Accordingly, the first surface 12A can be disposed at a position close to one outer pole 4 and a large size in the direction D1 can be secured, and the second surface 12B is disposed at a position close to the other outer pole 4. And a large size in the direction D1 can be secured.

  In the lifting magnet 1 according to the present embodiment, a notch 16 that is recessed inward is formed at the end of the magnetic part 9 in the direction D1. Since the vicinity of the end portion in the direction D1 of the magnetic part 9 includes a region where the magnetic flux does not need to flow, the notch part 16 is formed so that the magnetic flux can flow efficiently to the first surface 12A and the second surface 12B. Can do.

  In the lifting magnet 1 according to the present embodiment, a plurality of electromagnets 2 are arranged in the direction D2. As a result, even if the object to be lifted W is long in the direction D2, the object to be lifted W can be reliably lifted by being attracted by the attracting surfaces of the plurality of electromagnets 2.

  Here, the point which can lift a round pipe favorably by using the lifting magnet 1 which concerns on this embodiment is demonstrated with reference to FIG.5 and FIG.6. FIG. 6 shows a lifting magnet 100 according to a comparative example. As shown in FIGS. 6B and 6D, the electromagnet unit 103 of the lifting magnet 100 includes one inner pole 109 extending in the direction D2 and an outer pole 104 extending in the direction D2 so as to surround the inner pole 109. ing. The lifting magnet 100 is configured by arranging a plurality of such electromagnet units 103 in the direction D1. As a result, the lifting magnet 100 has a configuration in which a plurality of suction surfaces 112 on the inner pole 109 side extending in the direction D2 and a plurality of suction surfaces 111 on the outer pole 104 side extending in the direction D2 are provided in the direction D1.

  The position of the upper surface of the square pipe W1 with respect to the lifting magnet 100 when the square pipe W1 is lifted by such a lifting magnet 100 is shown in dark gray scale in FIG. 6B. As shown in FIG. 6B, since the upper surface of the square pipe W1 can be in contact with the lifting magnet 100 in a wide range, the square pipe W1 has both the adsorption surface 112 on the inner pole 109 side and the adsorption surface 111 on the outer pole 104 side. Can contact. Therefore, the lifting magnet 100 according to the comparative example can sufficiently lift the square pipe W1. On the other hand, the position of the upper surface of the round pipe W2 with respect to the lifting magnet 100 when the round pipe W2 is lifted by the lifting magnet 100 is shown by a dark gray scale in FIG. 6D. As shown in FIG. 6D, since the upper end of the round pipe W2 can contact the lifting magnet 100 only within a narrow range, depending on the position (for example, between the adjacent electromagnet units 103), the round pipe W2 has the inner pole 109. In some cases, the side suction surface 112 cannot be contacted. Therefore, the lifting magnet 100 according to the comparative example may not be able to lift the round pipe W2 sufficiently.

  On the other hand, as shown in FIG. 5B and FIG. 5D, the electromagnet unit 3 of the lifting magnet 1 according to the present embodiment includes a first surface 12A and a second surface 12B extending in the direction D1, as the attracting surfaces. A plurality of lower end surfaces 11 of the outer pole 4 extending in the direction D1 are provided along the direction D2. The lifting magnet 1 is configured by arranging a plurality of such electromagnet units 3 in the direction D1. Accordingly, the lifting magnet 1 includes an inner pole side attracting surface (first surface 12A and second surface 2B) extending in the direction D1, and an outer pole 4 side attracting surface (lower end surface 11) extending in the direction D1. ) In the direction D1.

  The position of the upper surface of the square pipe W1 relative to the lifting magnet 1 when the square pipe W1 is lifted by such a lifting magnet 1 is shown by a dark gray scale in FIG. 5B. As shown in FIG. 5B, since the upper surface of the square pipe W1 can come into contact with the lifting magnet 1 in a wide range, the square pipe W1 has an attracting surface on the inner pole side (first surface 12A and second surface 12B). And it can contact both the adsorption | suction surface (lower end surface 11) by the side of the outer pole 4. Therefore, the lifting magnet 1 according to the embodiment can sufficiently lift the square pipe W1. On the other hand, the position of the upper surface of the round pipe W2 with respect to the lifting magnet 1 when the round pipe W2 is lifted by the lifting magnet 1 is shown by a dark gray scale in FIG. 5D. As shown in FIG. 5D, the upper end of the round pipe W2 can be in contact with the lifting magnet 1 only within a narrow range, but the attracting surfaces on the inner pole side (the first surface 12A and the second surface 2B) and the outer pole Since a plurality of four-side suction surfaces (lower end surface 11) are provided extending in the direction D1, the round pipe W2 has an inner-pole-side suction surface (first surface 12A and second surface 2B) and an outer pole. It is possible to make contact with both of the four suction surfaces (lower end surface 11). Even when the round pipe W2 is disposed between the adjacent electromagnet units 3, the first surface 12A and the second surface 2B of one electromagnet unit 3 and the other first surface 12A and the second Since the gap between the second surface 2B and the second surface 2B is arranged to be sufficiently small and narrow, the round pipe W2 can come into contact with both the suction surfaces on the inner pole side and the outer pole side. Therefore, the lifting magnet 1 according to the embodiment can sufficiently lift the round pipe W2.

  The present invention is not limited to the embodiment described above.

  For example, the arrangement and number of the inner and outer poles of the lifting magnet according to the above-described embodiment are not particularly limited, and the shape is not particularly limited as long as the shape extends in the direction D1.

  For example, the shape of the notch formed in the magnetic part is not particularly limited, and may be a shape other than the V-shape. For example, as shown in FIG. 8A, a notch 36 that curves inward may be formed at the end of the magnetic part 39. The notch 36 is configured to draw a U shape inwardly from the end of the magnetic part 39 between the first surface 32A and the second surface 32B. Further, as shown in FIG. 8B, a notch 46 is formed at the end of the magnetic part 49 so as to cut out all the region outside the inner pole and between the first surface 42A and the second surface 42B. May be formed.

  Moreover, the structure of the 1st surface and 2nd surface of a magnetic part is not specifically limited. In the above-described embodiment, the entire attracting surface of the magnetic part is divided into the first surface and the second surface. On the other hand, a part of the attracting surface of the magnetic part may be divided by the first surface and the second surface. For example, as shown in FIG. 8C, the magnetic part 59 has one surface 55 as an attracting surface at a portion joined to the inner pole 56, and the first surface 52A and the second surface are formed at both ends in the direction D1. It has a surface 52B. The space portion 54 between the first surface 52A and the second surface 52B is formed by providing the notch portions 53 at both ends in the direction D1 of the magnetic portion 59. The first surface 52A and the second surface 52B are separated from each other via the space 54 in the direction D2. Further, the distance between the first surface 52A and one outer pole is smaller than the distance between the inner pole 56 and one outer pole, and between the second surface 52B and the other outer pole. Is smaller than the distance between the inner pole 56 and the other outer pole. 8D, the maximum width in the direction D1 and the maximum width in the direction D2 of the magnetic part 59 may be the same as or smaller than the inner pole 66. The magnetic part 69 has one surface 61 narrower than the inner pole 66 on the center side in the direction D1, and has a first surface 62A and a second surface 62B at both ends in the direction D1. . The space portion 64 between the first surface 62A and the second surface 62B is formed by providing the notch portions 63 at both ends in the direction D1 of the magnetic portion 69. The first surface 62A and the second surface 62B are separated from each other via the space portion 64 in the direction D2.

  In the above-described embodiment, the first surface and the second surface as the attracting surface are divided by forming the groove portion and the notch portion in the magnetic portion. Alternatively, the first surface and the second surface may be formed by providing two magnetic portions separated from each other with respect to the inner pole.

  DESCRIPTION OF SYMBOLS 1 ... Lifting magnet, 2 ... Electromagnet, 3 ... Electromagnet unit, 4 ... Outer pole, 6 ... Inner pole, 8 ... Coil, 9, 39, 49, 59, 69 ... Magnetic part, 12A, 32A, 42A, 52A, 62A ... 1st surface, 12B, 32B, 42B, 52B, 62B ... 2nd surface, 14 ... Space part, 16, 36, 46 ... Notch part.

Claims (5)

A lifting magnet having a plurality of electromagnets arranged in a first direction,
The electromagnet
A pair of outer poles extending linearly in the first direction;
An inner pole provided between the pair of outer poles and extending in the first direction;
A coil wound around the inner pole;
A magnetic part provided so as to be in contact with the inner pole,
The magnetic part has a first surface and a second surface formed as an adsorption surface,
A space is formed between the first surface and the second surface,
The first surface and the second surface are spaced apart from each other in the second direction perpendicular to the first direction via the space portion ,
The lifting magnet, wherein the first surface, the second surface, and the space are each linearly extended in the first direction .   2. The lifting magnet according to claim 1, wherein a maximum width of the magnetic portion in the second direction is larger than a maximum width of the inner pole in the second direction.   The lifting magnet according to claim 1, wherein a notch portion that is recessed inward is formed at an end portion of the magnetic portion in the first direction.   The lifting magnet according to any one of claims 1 to 3, wherein a plurality of the electromagnets are arranged in the second direction. A lifting magnet having a plurality of electromagnets arranged in a first direction,
The electromagnet
A pair of outer poles extending linearly in the first direction;
An inner pole provided between the pair of outer poles and extending in the first direction;
A coil wound around the inner pole;
A magnetic part provided so as to be in contact with the inner pole,
The magnetic part has a first surface and a second surface formed as an adsorption surface,
The distance between the first surface and one of the outer poles is smaller than the distance between the inner pole and one of the outer poles, and between the second surface and the other outer pole. the distance between the rather smaller than the distance between the inner electrode and the other of said outer pole,
The lifting magnet, wherein the first surface and the second surface each extend linearly in the first direction .