US1781998A - Magnetic separator - Google Patents

Description

Nov. 18, 1930. J BING- 1,781,998 I MAGNETIC SEPARATOR I Filed Aug. 8492a L c 24 I MINI d Patented Nov. 18, "1930 UNITED STATES PATENT orrlca JULIUS BIN'G, OI EIBENACH, GERMANY, ASSIGNOR TO THE FIRM MAGNET-WEBER G. I. B. 3., EISENACH SPEZIALFABRIK Fll'R 1" LEK'J.ROMAIifiI'E'JP-AEPARA'JPE, OI.

- EISENACH, GERMANY uaennrrc snranaron 1 Application filed August 8, 1928, Serial No. 298,364, and in Germany August 9, 1987.

- My invention relates to magnetic separators for separating the fine paramagnetic particles from a finely divided material containing diamagnetic particles and. the said paramagnetic particles. More particularly my invention relates to magnetic separators w ich are operated by alternating current and with which the material to be separated is subjected to the influence of an alternating magnetic field.

The good working qualities of a separator.

I with an alternating magnetic field are based in the first line on the shaking off of the nonmagnetic material due to the vibrating motions to which the magnetic particles are subjected by the alternating magnetic field. I have now experienced that with an alternating magneticfield an exceptionally good separation is effected by diverting the magnetic particles by centrifugal force.- My invention correspondingly consists in the first line in the combination of a separator having an alternating magnetic field with a divertin device operated by centrifugal force.

Iy invention further provides for the driving the diverting device by means of the magnetic field through which the magnetic separation is efiected, and also the device for feeding the material to be separated to the separating place proper may be driven by the same magnetic field according to my invention. Further objects of the invention will be apparent from the following detailed specification of a preferred embodiment of the invention which is represented in the drawing in a more schematic way.

In the drawing Fig. 1 is aside elevation, partly in section v Fig. 2 a top view of the separator.

The separator is operated by three-phase current and has a magnet 1 with three downwardly projecting poles 1, 1 and 1. In the drawing the means for supporting the magnet are not represented to increase the clearness; The magnet is excited by means of three coils 2, 2" and 2 which are mounted on the three cores of the magnet. The said coils are fed from a source of three-phase current which source is not represented inathe drawing. The coils are so connected and arranged that a Ferrariis field is produced .which rotates in a horizontal plane.

In close proximity and below the'horizontal surfaces of the poles' 1, 1 and 1 a thin disc 3- is mounted to' rotate in a horizontal plane. The said disc preferably consists of copper or aluminum and is fixed to a ver-' tical shaft 4 which is mountedwith its lower end in a bearing 5 and with its upper end in a bearing 6. To the upper end of the shaft 4 a bevel gear 7 is keyed meshing with a sec-. 7 I

10'is provided. The upper section 10' of-this band passes in a small distance from the lower side of the disc and within the magnet Below the disc 3an endless travelling band field of the oles of'the magnet 1; The band 10 is guide by pulleys 13 and 14 which are mounted in bearings 11 and 12.v Outside of the bearing 12 a pulley 16 is keyed to the. shaft 15 which bears the pulley 14. The pulley 16 is connected by a belt 17 with asmaller palley 19 keyed to a shaft 18 which bears another pulley 20 being in connection with a pulley 22 on the shaft 4 by means ofa crossed beltv 21. In this way'the endless travelling belt 10 is driven from the shaft 4.

Above oneend of the travelling band 10 a hopper 23 is provided for feeding the material to be se arated and below the other end of the travelling band a receptacle 24 is. arranged taking up the materialwhich has been freed from the magnetic particles. Below the disc 3 a receptacle 25 is provided to take u the magnetic particles which are separate from the material. The said paticles are carried along .by a lurality of radially extending ribs 26on t e lower side of the disc sod I 3, and the magnetic particles are centrifuged or thrown away as soon as they are outside of the'active zone of field of the magnet poles.

A'wall 27 .of sheet metal serves for the catchin up of the centrifuged or thrown of! partic es. The said wall has an inwardly extending flange 28 conforming to the circumference of the disc and a side-part 29 which is tapering downwardly and inwardly; The side-wall 29 forms an incomplete hopper through which the centrifuged magnetic material slides downwardly into the'receptacle 25.

The operation of the separator is as follows:

As soon as the exciting circuit of the magnet 1 is .closed and the disc 3 is rotated, the

material to be separated is fed through the hopper 23 to the baiid in a thin equable 7 layer and passes the active zone of field of the magnet poles below the disc 3. Thereby the material is stirred by the action of the magnetic alternating field, so that the magnetic particles are easily to be separated from. the

. non-magnetic particles. The magnetic partia speclal drive for the disc 3 and in a given cles are attracted by the magnet poles, so that they come into adhesion with the lower side of the disc 3. While the disc is rotating .in

the direction of the arrow of Fig. 2 the at tracted particles quit the active zone of field, and through the quick rotation of the disc the said particles are centrifuged and caught up by the wall 27.

- Instead of a three-phase current also an: other alternating current may be used for the exciting of the magnet coils. But the three-phasecurrent offers the preference that case also for the travelling band 10 may be dispensed with. In a disc consisting of a material which conducts the electricity eddycurrents are produced through the alternating field of the magnet 1. In coaction with the alternating field the said eddy-currents produce a turning moment through which the disc 3 is rotated. This rotation is transmitted by the belt-drive 17, 21 to the shaft 15 and the travelling band 10. By properly settling the magnetic and electric conditions the turning 1. In a magnetic separator, an alternating current electro-magnetprovided with down-' wardly extending free poles, a rotary disc being partly arranged below said poles and adapted to be moved in close proximity of said poles, means for feeding the material to be separated into the active zonev of the field of said poles below said discthe same having such a circular velocity that the mag;- netic particles of the material brought 'by magnet consequently to the magnetic field produced thereby.

. 2. In a magnetic separator an electro- I magnet being excitable by alternating current and provided with downwardly extending poles, a rotary disc being partly arranged below said poles and adapted to be moved by means of themagnetic field produced by said alternating current magnet in close proximity of said poles, means for feeding the material to be. separated into the active zone of the field of said poles below said disc, the same being revolved at such a velocity that the magnetic particles of the material brought by the magnet into adhesion with the disc are centrifuged from said disc outside of the active zone of the field of the magnet poles, and means for catching up the centrifuged particles.

3. In a magnetic separator an electromagnet being excitable by alternating current and provided with downwardl extendin poles, a rotary disc being art y arran e below said poles and adapte to be move in close proximity of said poles, carriers on the lower side of the said disc, meansfor feeding the material to be separated into the active zone of the field of said poles below said disc, the same being revolved by the magnetic field of said alternating current magnet at such a circular velocity that the magnetic particles of the material brought by the magnet into adhesion with the disc are centrifuged from the said disc outside of the active zone of the field of the magnet poles.

4. In a magnetic separator, electrical- -means for producing a magnetic rotary field,

means for feeding the material to be sepa rated into the active zone ofsaid field, rotatable means coacting with said electrical means for carrying magnetic particles out of said active zone, said rotatable means be-.

ing revolved b the magnetic rotary field produced by said electrical means, and said feeding-means being driven by said rotatable means.

5. A magnetic separator as specified in .claim 4-wherein the rotatable means include a disc and said feeding means include a conveyer, part of said disc revolving between said 'conveyer and said electrical means for producing a rotary magnetic field driving said disc.

6'. In a' magnetic separator, a multiple pole magnet for producing a magnetic rotary field, conveying means for feeding the ma terial to be separated into the active zone of said field, the poles of said multiple pole magnet bein arranged substantiall in alinement wit the feeding direction 0% and III above said conveying means, a rotatable disc part of which passes between said magnet and said conveying means for carrying the magnetic particles; attracted by sa' magnet towards the disc out of the active zone of said r magnet, said rotatable disc being revolved by the magnetic rotary field produced by said multiple pole magnet, and means to grive said conveying means by said rotatable f 1sc.

m 7. A magnetic se arator as specified in claim 6 wherein sai rotatable disc and said conveyin means immediately below said disc proceed in substantiall the same direction.

15 Intestimony whereo I afiixm signature.

a, JULIU BING.

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