JP5220299B2 - 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). FIG. 16 is a side sectional view showing the structure of this lifting electromagnet. Referring to FIG. 16, the lifting electromagnet 100 includes an inner iron core 102, an outer iron core 104, an upper iron core 106, and an exciting coil 108.
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 the conventional lifting magnet (lifting electromagnet) as shown in FIG. 16, a part of the magnetic flux that should pass through the suspended object when the outer diameter of the magnet is increased and the whole is flattened in order to improve performance with a constant weight. Does not pass through the suspended object and leaks to places other than the suspended object such as the inside of the excitation coil. This has contributed to lowering the adsorption efficiency of the lifting magnet.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a lifting magnet that can reduce the leakage of magnetic flux and increase the adsorption efficiency.

In order to solve the above problems, a first lifting magnet according to the present invention includes an inner pole extending in a predetermined axial direction, an outer pole provided around the inner pole around the predetermined axis, and an inner pole and an outer pole. A ferromagnetic main body including an interposer provided therebetween, a first coil disposed between the inner pole and the interposer, and wound around a predetermined axis, and between the interpole and the outer pole A second coil wound around a predetermined axis , and a non-magnetic member as a bottom plate disposed on one end side of the first and second coils, the height of the main body portion in the predetermined axis direction The ratio (H1 / D1) of the diameter H1 of the edge H1 and the outer edge of the end face in contact with the suspended object at the outer pole is 1/7 or more and 1/5 or less.

The second lifting magnet according to the present invention includes an inner pole extending in a predetermined axial direction, an outer pole provided around the inner pole around the predetermined axis, and a space between the inner pole and the outer pole. A ferromagnetic main body including a pole, a first coil disposed between an inner pole and an interpole, and wound around a predetermined axis, and disposed between the interposer and the outer pole; A distance between the outer surface of the inner pole and the inner surface of the outer pole, comprising a second coil wound around and a nonmagnetic member as a bottom plate disposed on one end side of the first and second coils; The ratio (r2 / r1) of r1 and the distance r2 between the outer surface of the inner pole and the center position between the side surfaces of the inner pole is 2/5 or less.

The third lifting magnet according to the present invention includes an inner pole extending in a predetermined axial direction, an outer pole provided around the inner pole around the predetermined axis, and a space between the inner pole and the outer pole. A ferromagnetic main body including a pole, a first coil disposed between an inner pole and an interpole, and wound around a predetermined axis, and disposed between the interposer and the outer pole; A second coil wound around, a nonmagnetic member as a bottom plate disposed on one end side of the first and second coils, a height H1 of the main body in a predetermined axial direction, and an outer pole The ratio (H1 / D1) of the diameter D1 of the outer edge of the end surface in contact with the suspended object is 1/7 or more and 1/5 or less, the distance r1 between the outer surface of the inner pole and the inner surface of the outer pole, and the inner pole The ratio (r2 / r1) of the distance r2 between the outer surface of the electrode and the center position between the side surfaces of the interelectrode is 2/5 or less. That.

  The inventors of the present invention divided the coil into first and second coils with respect to the conventional configuration as shown in FIG. And it discovered that the leakage of the magnetic flux to the clearance gap between the inside of a coil and a coil, and a suspended | suspended object can be reduced by providing between 2nd coils. That is, according to the above-described first to third lifting magnets, the leakage of magnetic flux can be reduced and the magnetic flux can be efficiently passed through the suspended object. Therefore, the adsorption efficiency of the lifting magnet compared to the conventional configuration Can be increased.

  Furthermore, the present inventors have made various studies by paying attention to the relationship between the shape of the lifting magnet and the adsorption efficiency in the case where the interelectrode is provided. As a result, like the first and third lifting magnets, the ratio (H1 / D1) of the height H1 of the main body portion in the predetermined axial direction and the diameter D1 of the outer edge of the end face in contact with the suspended object at the outer pole. It has been found that if it is 1/7 or more, a decrease in adsorption efficiency due to long-term use can be suppressed, and the adsorption force can be suitably maintained. Further, it has been found that when the ratio (H1 / D1) is 1/5 or less, such an adsorption force maintaining effect is more effectively exhibited as compared with the case where no interelectrode is provided. That is, according to the first and third lifting magnets, it is possible to increase the adsorption efficiency as compared with the conventional configuration and to effectively suppress a decrease in the adsorption efficiency due to long-time use.

  Further, the present inventors, like the above-described second and third lifting magnets, have a distance r1 between the outer surface of the inner pole and the inner surface of the outer pole, and between the outer surface of the inner pole and the side surface of the interpole. It has been found that when the ratio of the distance r2 to the center position (r2 / r1) is 2/5 or less, the above-described effect due to the provision of the interelectrode is more remarkable. That is, according to the second and third lifting magnets, the adsorption efficiency can be further increased as compared with the conventional configuration.

  Further, the first to third lifting magnets may be characterized in that a ratio (r2 / r1) of the distance r1 and the distance r2 is 1/7 or more. The present inventors have found that if the ratio (r2 / r1) is 1/7 or more, a decrease in adsorption efficiency due to long-term use can be more effectively suppressed. That is, according to the lifting magnet, it is possible to increase the adsorption efficiency and further suppress the decrease in the adsorption efficiency due to long-time use.

  The first to third lifting magnets may be characterized in that the width of the interpole in the radial direction orthogonal to the predetermined axis is greater than 1.2 mm. The inventors of the present invention have found that a decrease in adsorption efficiency due to long-time use can be more effectively suppressed by making the width of the interelectrode larger than 1.2 mm. That is, according to the lifting magnet, it is possible to increase the adsorption efficiency and further suppress the decrease in the adsorption efficiency due to long-time use.

  According to the lifting magnet of the present invention, it is possible to reduce the leakage of magnetic flux and increase the adsorption efficiency.

  Hereinafter, embodiments 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.

  FIG. 1 is a side sectional view showing the configuration of an embodiment of a lifting magnet according to the present invention. 2 is a cross-sectional view showing a cross section taken along line II-II of the lifting magnet 1 shown in FIG. Note that the lifting magnet 1 of the present embodiment has a cylindrical appearance centered on a predetermined axis C, and the cross section on one side with respect to the axis C is not shown in FIG.

  Referring to FIGS. 1 and 2, the lifting magnet 1 of this embodiment includes a case 2, coils 20 and 21, and fixing members 41 and 42. The coil 20 is a first coil in the present embodiment, and is arranged between an inner pole 12 and an interpole 14 which will be described later, and a conductive wire is wound around the axis C. The coil 21 is a second coil in the present embodiment, and is arranged between a later-described intermediate electrode 14 and an outer electrode 13, and a conductive wire is wound around the axis C.

  Here, FIG. 3 is an enlarged view showing in detail the structure of partial cross sections (A1 and A2 in the drawing) of the coils 20 and 21. FIG. The coils 20 and 21 have a conducting wire 22 and an insulating coating film 23. The conducting wire 22 is wound around the 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.

  Please refer to FIG. 1 and FIG. 2 again. The case 2 is a member for housing the coils 20 and 21. The case 2 includes a nonmagnetic member 15 as a bottom plate disposed on one end side of the coils 20 and 21 and a main body portion 10 made of a ferromagnetic member. Further, the main body 10 includes a yoke 11 as a top plate disposed on the other end side of the coils 20 and 21, an inner pole 12 disposed on the inner side of the coil 20, and an outer pole disposed on the outer side of the coil 21. 13 and an interelectrode 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 columnar member that extends in the winding axis direction of the coil 20 (that is, the direction parallel to the central axis C) along the inner side surface 20 b of the coil 20, 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 portion 12a is configured to be removable from the main body portion 10, and is exchanged according to wear.

  The interpole 14 is a cylindrical member extending in a direction parallel to the central axis C 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 a direction parallel to the central axis C 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 main body portion 10 similarly to the end portion 12a of the inner pole 12, and is exchanged 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 adsorption surface of the object to be suspended is a plane, the ends 12a and 13a are objects to be suspended. Abuts on the surface to be attracted.

  The yoke 11 is a 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 12-14 and the yoke 11. The poles 12 to 14 and the yoke 11 may be integrally formed by casting or the like. 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 in the inner pole 12, the outer pole 13, and the interpole 14.

  The nonmagnetic member 15 is a 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 nonmagnetic member 15 is made of a nonmagnetic 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. Further, the nonmagnetic member 15 has an opening 15 a through which the inner pole 12 passes in the central portion, and one end of the inner pole 12 is exposed downward from the nonmagnetic member 15. An outer peripheral portion (edge portion 15 b) of the nonmagnetic member 15 is fixed to the outer pole 13.

  The fixing members 41 and 42 are members for fixing the coils 20 and 21 in the case 2 by filling and hardening the gaps between the coils 20 and 21 and the case 2, respectively. The fixing members 41 and 42 are made of an insulating material such as an epoxy resin.

  The effects of the lifting magnet 1 having the above configuration will be described below.

但し、数式（１）において、Ｍは強磁性体（吊対象物）の磁化［Ａ／ｍ］、Ｖは吊対象物の体積［ｍ^３］、Ｂは吊対象物中の磁束密度［Ｔ］、ｚは内極及び外極の一端面（吸引面）を原点とする励磁コイルの巻回軸方向座標、μ_０は真空透磁率［Ｈ／ｍ］、Ｈは空間に分布する磁界強さ［Ａ／ｍ］である。 Generally, the magnetic force F exerted on the suspended object is expressed by the following formula (1).

However, in Formula (1), M is the magnetization [A / m] of the ferromagnetic material (suspended object), V is the volume [m ³ ] of the suspended object, and B is the magnetic flux density [T] in the suspended object. , Z is a winding axis direction coordinate of the exciting coil with one end surface (attraction surface) of the inner and outer poles as an origin, μ ₀ is a vacuum permeability [H / m], and H is a magnetic field strength distributed in space [ A / m].

但し、ρは吊対象物の密度［ｇ／ｍ^３］、ｇは重力加速度［ｍ／ｓ^２］である。 Conditions suspended object is lifted to the lifting magnet is to exceed the force of gravity F _g according to the magnetic force F is suspended object in Equation (1). Therefore, the lifting condition is expressed by the following formula (2).

However, ρ is the density [g / m ³ ] of the suspended object, and g is the gravitational acceleration [m / s ² ].

  Here, FIG. 4 is a diagram showing an example of distribution of magnetic flux density in a lifting magnet (see FIG. 16) having a conventional configuration. Referring to FIG. 4, it can be seen that a part of the magnetic flux that should ideally pass through the suspended object L leaks to the inside of the coil 108 and other than the lifting magnet 100. For this reason, the density of the magnetic flux passing through the suspended object L is reduced with respect to the magnitude of the excitation current flowing through the coil 108, which is one factor that suppresses the adsorption efficiency. Moreover, the magnetic flux density in the suspended object mainly spreads in the z-axis direction (that is, the central axis direction), and the spread in the radial direction is insufficient. Therefore, since the magnetic flux having a magnitude satisfying the formula (2) does not spread sufficiently in the radial direction, the area satisfying the formula (2) is small and wasteful.

  On the other hand, FIG. 5 is a diagram showing the distribution of magnetic flux density in the lifting magnet 1 of the present embodiment. As shown in FIG. 5, in the present embodiment, the flow of magnetic flux is controlled by providing the interpole 14, and the magnetic flux leaking into the coils 20 and 21 and the gap between the lifting magnet 1 and the suspended object L is reduced. Reduced. Therefore, since the magnetic flux leaking to other than the suspended object can be reduced and the magnetic flux can be efficiently passed through the suspended object L, the adsorption efficiency of the lifting magnet 1 can be increased as compared with the conventional configuration.

  Moreover, in this embodiment, since the diameter of the lifting magnet 1 (diameter D1 in FIG. 1) can be increased by providing the interelectrode 14, the magnetic flux density to the suspended object L is uniformly distributed, and The projected area of the lifting magnet 1 with respect to the suspended object L increases. As a result, a magnetic force is efficiently generated for the suspended object L, and the adsorption efficiency can be increased.

  Moreover, since the exciting current required for generating a required magnetic force can be reduced by the above effect, the amount of generated Joule heat in the coils 20 and 21 can be suppressed. Furthermore, the Joule heat generated in the coils 20 and 21 can be released to the outside through the intermediate electrode 14. As a result, it is possible to suppress a decrease in the attractive force due to the temperature rise of the coils 20 and 21 and to maintain the necessary attractive force for a long time.

  Further, in the lifting magnet 1 of the present embodiment, the distance r1 between the outer surface 12b of the inner pole 12 and the inner surface 13b of the outer pole 13 and the distance between the outer surface 12b of the inner pole 12 and the side surfaces 14b and 14c of the interelectrode 14 are shown. The ratio (r2 / r1) of the distance r2 to the center position E is preferably 2/5 or less, and more preferably 1/7 or more. However, the outer surface 12b of the inner pole 12 is a surface facing the inner surface 20b of the coil 20, the inner surface 13b of the outer pole 13 is a surface facing the outer surface 21c of the coil 21, and the side surface 14b of the interpole 14 Is the surface facing the outer surface 20 c of the coil 20, and the side surface 14 c of the interpole 14 is the surface facing the inner surface 21 b of the coil 21.

  The inventors have determined the position of the interelectrode 14 with respect to the inner electrode 12 and the outer electrode 13 (that is, the center position E between the side surfaces of the interelectrode 14) and the adsorption capacity of the lifting magnet 1 (the amount of suspension immediately after energization, 8 hours). Regarding the relationship between the amount of suspension after energization and the amount of decrease in suspension after energization for 8 hours), the mass of the lifting magnet 1 was verified as constant. FIG. 6 shows the amount of suspension immediately after energization, the amount of suspension after energization for 8 hours, and the interval when the ratio (r2 / r1) is changed between 0 and 4/5 by appropriately changing the distances r1 and r2. It is a chart which shows the amount of hanging amount fall. FIG. 7 is a graph showing the relationship between the ratio (r2 / r1) and the suspension amount immediately after energization, and FIG. 8 is a graph showing the relationship between the ratio (r2 / r1) and the suspension amount reduction amount. . Note that the broken lines in FIGS. 7 and 8 indicate values when the interelectrode 14 is not provided for comparison.

  As shown in FIG. 7, when the ratio (r2 / r1) is 2/5 or less, the hanging amount becomes larger than the case where the interelectrode 14 is not provided, and the above-described effect (adsorption efficiency) by the interelectrode 14 is provided. It can be seen that an increase in In addition, as shown in FIG. 8, if the ratio (r2 / r1) is 1/7 or more, the amount of decrease in the amount of suspension after 8 hours of energization is smaller than that in the case where the interelectrode 14 is not provided. It can be seen that a decrease in adsorption efficiency due to use can be effectively suppressed. Therefore, the ratio (r2 / r1) is preferably 1/7 or more and 2/5 or less.

  Further, in the lifting magnet 1 of the present embodiment, the height H1 of the main body 10 in the direction along the predetermined axis C and the end surface (that is, the lower end surface of the end portion 13a) in contact with the suspended object at the outer pole 13. The ratio (H1 / D1) with the diameter D1 of the outer edge is preferably 1/7 or more and 1/5 or less.

  The inventors of the present invention are the diameter of the contact surface of the lifting magnet 1 with the object to be suspended (that is, the diameter D1) and the adsorption capacity of the lifting magnet 1 (the suspended amount immediately after energization, the suspended amount after energization for 8 hours, and 8 hours. With respect to the relationship with the amount of decrease in the suspended amount immediately after energization during energization, the mass of the lifting magnet 1 was made constant, and the ratio (r2 / r1) was made constant at 1/3. FIG. 9A shows the amount of suspension immediately after energization and energization for 8 hours when the ratio (H1 / D1) is changed between 1/4 and 1/9 by appropriately changing the height H1 and the diameter D1. It is a table | surface which shows the amount of subsequent suspension, the amount of suspension amount fall | interval in the meantime, the amount change of suspension amount, and the amount of fall amount. Here, the hanging amount change rate is a numerical value indicating the hanging amount ratio immediately after energization when (H1 / D1) = 1/4 is used as a reference, and the decrease amount rate is (H1 / D1) = It is a numerical value showing the ratio of the amount of decrease in suspension amount immediately after energization for 8 hours when 1/4 is used as a reference. FIG. 10 is a graph showing the relationship between the ratio (H1 / D1), the hanging amount change rate (graph G1), and the decrease amount rate (graph G2).

  As shown in FIG. 10, even if the ratio (H1 / D1) is changed from 1/4 to 1/7, the hanging amount change rate and the decrease amount rate are almost the same, but the ratio (H1 / D1) is 1/7. If it is made smaller, the rate of decrease increases rapidly. From this, it can be seen that if the ratio of the height H1 to the diameter D1 (H1 / D1) is 1/7 or more, a decrease in adsorption efficiency due to long-time use can be suppressed, and the adsorption force can be suitably maintained.

  Here, in the conventional lifting magnet shown in FIG. 16, the outer diameter of the lifting magnet body is increased and the height of the lifting magnet is reduced without changing the excitation current value determined by the mass and the supplied power. Consider the case. FIG. 9B shows a case where the height H and the diameter D are appropriately changed when the conventional lifting magnet is flattened (that is, the shape having no interelectrode 14 compared with the lifting magnet 1 of the present embodiment). When the ratio (H / D) is changed between 1/4 to 1/6, the amount of suspension immediately after energization, the amount of suspension after energization for 8 hours, the amount of decrease in suspension during that time, the rate of change in suspension amount, It is a graph which shows a fall amount rate. FIG. 11 is a graph showing the relationship between the ratio (H / D), the hanging amount change rate (graph G3), and the drop amount rate (graph G4).

  When the lifting magnet is flattened without providing the interelectrode 14, as shown in FIG. 11, the hanging amount change rate increases, but the decrease amount rate also increases. For this reason, even if the adsorption capability immediately after energization can be improved, the reduction in the adsorption capability during long-time use will be spurred. On the other hand, since the lifting magnet 1 of this embodiment is provided with the interposition electrode 14, it can suppress effectively the fall of the adsorption | suction capability at the time of long-time use.

  FIG. 12 is a graph showing changes in the amount of suspension from immediately after energization to after 8 hours of energization according to the ratio of height H1 to diameter D1 (H1 / D1). Graphs G5 to G7 in FIG. 12 show the case where the ratio (H1 / D1) is 1/4, 1/5, and 1/6, respectively, in the lifting magnet 1 of the present embodiment having the interpole 14. Show. Graphs G8 to G10 show a case where the ratio (H / D) is 1/4, 1/5, and 1/6, respectively, in a conventional lifting magnet that does not include the interpole 14. . In this case as well, the mass of the lifting magnet is constant.

  As shown in FIG. 12, when the ratio (H1 / D1) is set to 1/4, the hanging amount immediately after energization and the hanging amount after 8 hours energization are hardly affected by the presence or absence of the interelectrode 14. In the case where (H1 / D1) is 1/5 or less, the amount of suspension increases when the interelectrode 14 is provided. Thus, if the ratio (H1 / D1) is 1/5 or less, the attractive force maintaining effect of the lifting magnet 1 of the present embodiment is more effectively exhibited as compared with the case where the interelectrode 14 is not provided. I understand that

  In the lifting magnet 1 of the present embodiment, the width of the interpole 14 in the radial direction of the lifting magnet 1 (the width t in FIG. 1, ie, the distance between the side surface 14b and the side surface 14c) is preferably larger than 1.2 mm. . Here, FIG. 13 shows the amount of suspension immediately after energization, the amount of suspension after energization for 8 hours, when the width t of the interelectrode 14 is changed from 0 mm (that is, the state where the interelectrode 14 is not provided) to 24 mm. It is a chart which shows the amount of hanging amount fall in the meantime. FIG. 14 is a graph showing the relationship between the width t of the interelectrode 14 and the suspension amount immediately after energization, and FIG. 15 shows the relationship between the width t of the interelectrode 14 and the suspension amount after 8 hours of energization. It is a graph.

  As shown in FIG. 14 and FIG. 15, when the interelectrode 14 is installed, it can be said that it is effective if the width t is larger than 0 in relation to the hanging amount immediately after energization, but with the hanging amount after 8 hours energization. In relation, it is difficult to say that the width t does not exceed 1.2 mm. From this, it can be seen that by making the width t of the interelectrode 14 greater than 1.2 mm, the reduction of the adsorption efficiency due to long-time use is suitably suppressed, and the adsorption force can be suitably maintained.

  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, one end of the interelectrode is housed inside the case, but one end of the interelectrode may be exposed to the outside of the case in the same manner as one end of the inner and outer poles.

It is side surface sectional drawing which shows the structure of one Embodiment of the lifting magnet by this invention. It is sectional drawing which shows the cross section along the II-II line of the lifting magnet shown in FIG. It is an enlarged view which shows the structure of the partial cross section of a coil in detail. It is a figure which shows distribution of the magnetic flux density in a lifting magnet provided with the conventional structure shown in FIG. It is a figure which shows distribution of the magnetic flux density in the lifting magnet which concerns on embodiment. When the distances r1 and r2 are appropriately changed and the ratio (r2 / r1) is changed between 0 and 4/5, the amount of suspension immediately after energization, the amount of suspension after 8 hours of energization, and the decrease in the amount of suspension between them It is a chart which shows quantity. It is a graph which shows the relationship between ratio (r2 / r1) and the amount of hanging immediately after electricity supply. It is a graph which shows the relationship between ratio (r2 / r1) and suspension amount fall amount. (A) Suspension amount immediately after energization and suspension amount after energization for 8 hours when the ratio (H1 / D1) is changed between 1/4 and 1/9 by appropriately changing the height H1 and the diameter D1. It is a graph which shows the amount of suspension amount fall, the amount change rate of suspension amount, and the amount of fall amount in the meantime. (B) Immediately after energization when the conventional lifting magnet is flattened and the ratio (H / D) is changed between 1/4 and 1/6 by appropriately changing the height H and diameter D. It is a chart which shows the amount of suspension, the amount of suspension after energization for 8 hours, the amount of decrease in amount suspended, the rate of change of amount of suspension, and the rate of decrease It is a graph which shows the relationship between ratio (H1 / D1), hanging amount change rate, and fall amount rate based on Fig.9 (a). It is a graph which shows the relationship between ratio (H / D), hanging amount change rate, and fall amount rate based on FIG.9 (b). It is a graph which shows the change of the amount of suspension from immediately after electricity supply to after 8 hours electricity supply according to ratio (H1 / D1) of height H1 and diameter D1. It is a chart which shows the amount of suspension immediately after energization, the amount of suspension after energization for 8 hours, and the amount of decrease in the amount of suspension between them when the width of the interelectrode is changed from 0 mm to 24 mm. It is a graph which shows the relationship between the width | variety of an interpole, and the amount of hanging immediately after electricity supply. It is a graph which shows the relationship between the width | variety of an interpole, and the amount of suspension after 8 hours energization. It is side surface sectional drawing which shows the structure of the conventional lifting electromagnet.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Lifting magnet, 2 ... Case, 10 ... Main part, 11 ... Yoke, 12 ... Inner pole, 13 ... Outer pole, 14 ... Interpole, 15 ... Nonmagnetic member, 20, 21 ... Coil, 22 ... Conductor, 23 ... insulation coating film, 41, 42 ... fixing material.

Claims (5)

A ferromagnetic main body including an inner pole extending in a predetermined axial direction, an outer pole provided around the inner pole around the predetermined axis, and an intermediate pole provided between the inner pole and the outer pole When,
A first coil disposed between the inner pole and the intermediate pole and wound around the predetermined axis;
A second coil disposed between the intermediate electrode and the outer electrode and wound around the predetermined axis ;
A non-magnetic member as a bottom plate disposed on one end side of the first and second coils ,
The ratio (H1 / D1) of the height H1 of the main body portion in the predetermined axial direction and the diameter D1 of the outer edge of the outer surface in contact with the suspended object is 1/7 or more and 1/5 or less. A lifting magnet. A ferromagnetic main body including an inner pole extending in a predetermined axial direction, an outer pole provided around the inner pole around the predetermined axis, and an intermediate pole provided between the inner pole and the outer pole When,
A first coil disposed between the inner pole and the intermediate pole and wound around the predetermined axis;
A second coil disposed between the intermediate electrode and the outer electrode and wound around the predetermined axis ;
A non-magnetic member as a bottom plate disposed on one end side of the first and second coils ,
The ratio (r2 / r1) of the distance r1 between the outer surface of the inner pole and the inner side surface of the outer pole and the distance r2 between the outer surface of the inner pole and the center position between the side surfaces of the inner pole is 2/5. Lifting magnet characterized by the following: A ferromagnetic main body including an inner pole extending in a predetermined axial direction, an outer pole provided around the inner pole around the predetermined axis, and an intermediate pole provided between the inner pole and the outer pole When,
A first coil disposed between the inner pole and the intermediate pole and wound around the predetermined axis;
A second coil disposed between the intermediate electrode and the outer electrode and wound around the predetermined axis ;
A non-magnetic member as a bottom plate disposed on one end side of the first and second coils ,
The ratio (H1 / D1) of the height H1 of the main body portion in the predetermined axial direction and the diameter D1 of the outer edge of the outer surface in contact with the suspended object is 1/7 or more and 1/5 or less,
The ratio (r2 / r1) of the distance r1 between the outer surface of the inner pole and the inner side surface of the outer pole and the distance r2 between the outer surface of the inner pole and the center position between the side surfaces of the inner pole is 2/5. Lifting magnet characterized by the following:   The lifting magnet according to any one of claims 1 to 3, wherein a ratio (r2 / r1) of the distance r1 and the distance r2 is 1/7 or more. The lifting magnet according to any one of claims 1 to 4, wherein a width of the interpole in a radial direction orthogonal to the predetermined axis is greater than 1.2 mm.

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