US 11,875,940 B2
Lifting-magnet attachment magnetic pole unit, steel-lifting magnetic-pole-equipped lifting magnet, steel material conveying method, and steel plate manufacturing method
Yuki Takaki, Tokyo (JP); Masaki Kobayashi, Tokyo (JP); and Junichi Yotsuji, Tokyo (JP)
Assigned to JFE Steel Corporation, Tokyo (JP)
Appl. No. 16/767,200
Filed by JFE Steel Corporation, Tokyo (JP)
PCT Filed Nov. 29, 2018, PCT No. PCT/JP2018/044025
§ 371(c)(1), (2) Date May 27, 2020,
PCT Pub. No. WO2019/107504, PCT Pub. Date Jun. 6, 2019.
Claims priority of application No. 2017-228619 (JP), filed on Nov. 29, 2017.
Prior Publication US 2020/0385240 A1, Dec. 10, 2020
Int. Cl. H01F 7/20 (2006.01); B66C 1/06 (2006.01); B66C 1/04 (2006.01); H01F 7/13 (2006.01); H01F 7/18 (2006.01)
CPC H01F 7/206 (2013.01) [B66C 1/04 (2013.01); B66C 1/06 (2013.01); H01F 7/13 (2013.01); H01F 7/18 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A lifting-magnet attachment magnetic pole unit for a lifting magnet used to lift and convey a steel material with magnetic force, the lifting-magnet attachment magnetic pole unit comprising:
a first split magnetic pole in contact with an iron core of the lifting magnet, the first split magnetic pole having a branched structure; and
a second split magnetic pole in contact with a yoke of the lifting magnet, the second split magnetic pole having a branched structure,
wherein the first and second split magnetic poles are alternately arranged, and
wherein the first split magnetic pole has dimensions satisfying Inequality (1):
S×B<L×t×BS  Inequality (1)
where
S is a cross-sectional area (mm2) of an inner pole of the lifting magnet;
B is a mean magnetic flux density (T) inside the inner pole of the lifting magnet;
L is a total perimeter (mm) of the first split magnetic pole in a region where the first split magnetic pole is in contact with a lifted steel material;
t is a plate thickness (mm) of the lifted steel material; and
BS is a saturation magnetic flux density (T) in the lifted steel material.