US1842851A - Magnetic separation and discharge of bulk goods - Google Patents

Description

(5. ULLRICH Jan. 26, 1932.

MAGNETIC SEPARATION AND DISCHARGE OF BULK GOODS Filed Dec. 8. 1925 Patented Jan. 26, 1932 rares PATENT earl- 6E GrEORGr ULLRICH, 0F MAGDEBURG, GERMANY, ASSIGNOB TO 'ZEBIEDuKRU PP GRUSON- WEB-K AKTIENGESELLSGHAFT,

OF MAGDEBURGQBUGKAU, GERMANY MAGNETIC SEPARATION AND DISCHARGEOF BULILGQODS Application filed December 8; 1925, Serial No. 7434a, and in Germany December 12, 1924.

The present invention relates to means for transporting bull: goods of the t 'pe employing conveyor bands which are upported by rollers in such a manner as to form a trough, so that the bulk goods form deeper layer '11 the centre than at the edges. If during the transport magnetic substances are to be separated from such goods or material, the discharge drum is formed into a magnetic separation. drum, and in such drums as hitherto constructed the same magnetic power of attraction has been provided throughout the whole width of the conveyor band. It has been necessary, therefore, to use an excitation current sufficiently strong to ensure that, even in the centre of the band, where the material forms the deepest layer, the magnetic substances should be attracted in a reliable manner, whilst tor the thinner layer of material at the edges of the band, a smaller excitation current would have been suificient. Such separation drums involve, therefore, higher cost as regards purchase and current than is necessary.

According to the "present invention these drawbacks are avoided by constructing the separation and discharge drum in such a manner that the magnetic field strength decreases from the centre of the conveyor band-towards its edges. This end may be attained in various ways, for example, the field gaps of the drum could either be arranged transversely of the axis, that is to say extend circumferentially, or they could be formed into slots extending parallel to the axis; In the former case the magnetic strength in the circumferential gaps decreases from the centre of the band towards its edges. In the latter case bar-shaped poles are formed in such a manner as to constitute between them field gaps of a width increasing from the centre of the band towards its edges.

With the improved construction of drum, a more reliable attraction oi the magnetic substance throughout the whole width of the band can be ensured with smaller conductors and current consumption than with drums as hitherto proposed.

In order that the invention may be clearly Y understood and readily carried into effect, it

will be described more fully with reterence to the accompanying drawings, in which Figures 1 and 2 are longitudinal views, partly in section, of two formsot magnetic separating and discharging drumin which the field gaps are circumferential.

In the form of the invention shown in Figure 1 pole discs 1 are mounted on amagnet core 2 and enclose between them excitation coils 3 and 4, the centralcoil 3 haseither more windings than the lateral coils 4, or it is excited by a stronger current than the latter, with the result that there is a greater'force of attraction over the central field gap than overthe lateral fieldgaps. In this case either all pole discs and gap widths could'be the same or, for the purpose of still further increasing thefield strength of the central field, its pole discs could be made wider than the outer ones, and its gap width could also be made smaller than that, of the outer fields.

In the example depicted in Figure 2, six pole discs 1 are mounted on the magnet core 2, the two central ones being the widest and the others narrower than these. Accordingly a stronger tral pole discs than that between the adjoining discs, and these two fields are stronger than the end fields. The two outer pole discs of each side could be made longitudinally adjustable on the magnet core by means of the screws 5 or in some other manner, for the purpose of regulating the strength of the fields.

The separation and discharge drum may be suitably enclosed in a protective casing 10.

What I claim is I 1. A magnetic separator and discharge drum for conveyor bands comprising, a core having a plurality of circular pole disks and an exciting winding, the pole disks nearer the middle of the drum being wider than those nearer the outside, whereby a magnetic field of continuously increasing strength from the outside toward the center of the drum is produced.

2. In a magnetic separator and discharge drum for conveyor bands, a core having pole pieces, defining a plurality of gaps, distributed over the peripheral surface of the drum field exists between the two cen-' near its edges as well as at the center thereof, and means for creating a magnetic field extending across said gaps, said pole pieces being so arranged as toprovide a continuous increasing field strength from the edges toward the center of the drum.

3. In amagnetic separator and discharge drum for conveyor bands, a core, an exciting winding on said core, a plurality of pole disks distributed along said core and forming circumferential field gaps, the construction being such that a stronger field is produced between the pole disks located near the center of said core than between those located near 5 its ends.

l. In a magnetic separator and discharge drum for conveyor hands, a core, a plurality of pole disks on said core forming circumferential field gaps, and an exciting winding on said core, the an'inere turns of said exciting winding between the pole disks nearest the middle of said core being greater than between the pole disks nearer the ends of aid core.

5. A magnetic separator and discharge drum for conveyor bands comprising, a core having a plurality of circular pole disks and an exciting winding, the pole disks near the middle of the drum being wider than those nearer the outside, said lateral pole disks furthermore being mounted in an axially adjustable manner.

The foregoing specification signed at Berlin, Germany, this 23rd day of November,

DB. Inc. 11. o. GEORG ULLRICH.

Images