Electromagnetic drum for cleaning ferromagnetic scrap of medium and large size

摘要

An electromagnetic drum for magnetic separator comprises a cylindrical structure (6) of ferromagnetic material provided with a plurality of solenoids (2a, 2b) wound on pole bodies (1a, 1b) having pole shoes (3a, 4a; 3b, 4b) arranged at the radially distal end thereof, said pole bodies (1a, 1b) and the solenoids (2a, 2b) wound thereon being all arranged on a same side of a longitudinal midplane of the drum, the solenoids (2a, 2b) having their axes substantially perpendicular to the longitudinal drum axis and each pole body (1a, 1b) extending mainly in a plane substantially perpendicular to said drum axis and substantially parallel to the planes of the other pole bodies (1a, 1b). Such a drum can provide a magnetic field suitable to draw even very large and heavy ferromagnetic scrap without having to face polarity changes along the circumferential path and while retaining cost and size similar to conventional drums.

主权项

1. An electromagnetic drum for magnetic separator comprising
a generally cylindrical structure of ferromagnetic material provided with a plurality of solenoids wound on pole bodies having pole shoes arranged at the radially distal end thereof,
each solenoid having a solenoid axis substantially perpendicular to a central longitudinal axis of the drum andeach pole body extending in a plane substantially perpendicular to said drum axis and substantially parallel to the planes of the other pole bodies,said cylindrical structure being enclosed within a cylindrical shell of non-magnetic material that is rotatably mounted coaxially around the cylindrical structure and is provided with longitudinal ribs, and an unwound pole body without a solenoid wound thereon which only serves the purpose of cancelling the magnetic field being arranged beyond said solenoids in the direction of rotation of said shell in a plane substantially perpendicular to the planes of the pole bodies, wherein said electromagnetic drum includes central and end pole bodies all having solenoids wound thereon and pole shoes arranged at the radially distal ends thereof and in that said pole bodies and the solenoids wound thereon are all arranged on a same side of a longitudinal midplane of the drum.