US1617971A - Magnetic separator - Google Patents

Description

* 4 5 with moved separating A separators .may likewise be used. -When g ',separator. For

Patented Feb. 15, 1927.. l

UNITED STATES PATENT oEFicE eEoaG ULLBIGH, or MAGDEBURG, GERMANY,' A ssIGNon iro' THE FIRM FRIED.

KBUPP GRUSONWERK AKTIENGESELLSCHAFT, l? MAGDEBURG-BUCKAU, GER- Application led February 28, 1925, Serial No.

. i The invention deals with a rocess f or the magnetic separation of cru e material of various size of, grains.. In order tobe 1nl 'a position to treat various sizes of .grains 1t 5 was hithertoeither necessary to use several separating contrivances each of which 1n d Aconformity with its-peculiarity could'only be' adapted toa special' size of grains, or, if only one separ tor is working, the various sizes-of ,grains had to be treated on same, one after another. The former process makesit necessary to provide several separators increasing thereby considerably the cost-price and the costs of runnlng the plant. This is especially of great importance'for plants in which only comparatively small quantities of'suchmaterial are treated. The second process requires after the kinds of grains have been separated a single treatment of each size of grains,' one after another. -It must then be kept in'vie'w) i, e., -for drum-separators rotating at uniform speed of themoved separatingsurfacethat each kind of grains drops o or is thrown oif at a special angle. vItl would therefore 'eitherbe necessary to adjust especially for each kind of grains the catching devices for the material, or the speeds of rotation Y of the separating surface, or both. .It .is

ao obvious that thoughfsaid process' is cheaperthan the former, itis rather circumstantial, wearisome and less productive.I Y E Allthe aforesaid disadvantages can be removed by the process dealt with by the invention. By the new process,l several of grains canbe treated side by side o n a common separating surface or on two. or more 4separating sur aces set Vin motion together, whilst the magnetic 'material is eifected independently.

ItV will be expedient tov use rum-separators. for the simultaneous Vseparation of varifus sizes of grains, but other separatorsv surface, i. e.- bandusindrum-'separatqrs the streams of nia-.- teria contaimng the several sizes of grains..4 are charged side by side into the drum'- each stream of material one provides on the side where the materialA -videfhwith 'a screen,

separation of the several 40 streams of material into magnetic andnonranged 1n such a MAGNETIC sEzPABA'roE. y

12,286, and .in Gernianyseptembr 23, 1920.

drops a special terial is caught, being adjustable according to requirements. I

Instead of a single drum to be used for all streams of vmaterial in common one can ari-ange likewise side by side several drums which are set'in motion together.' One can likewise graduate the ydrums in such a way, that they yary in diameterv within the touch of the various streams of material. In the same way the -drums when'A set in motion together can be graduated as to diameter l This lmaybe expedi-v one against another. ent if .the sizes of material diier very much so that with the same diameter of the drum the angle in which the sizes'of material drop becomes too unlike. In the various grades the lspeed at rt'he circumference varies and the `difference the various 'streams of material is considerably di1ninishe`d,' so that by adjustin simetal.' sheet, where Athe ma- I `in the angle -of the'drop of.

multaneously the several partition wa s a very pure separation' of. the 'magnetic and of' the non-magnetic material can be attained.

In order to separate admission'of the sizes of materiala `feeding' table (for common use) provided with two or more table surfaces laced one below another. Each of said tabJ e surfaces with the exception of the width of mesh of said screens decreasing Vfrom top tol bottom.- All table surfaces are provlded with guiding mechanisms (discharge ends) which arel directed in such a Wa of .grains wandering: over t e several tablesurfaces .are charged side by side on Athe separating surfaces. This can also be arwa that the spouts of the table-surface disc arges are at 'various distances from the vertical axial centreline of the .drum-separator, in order to be able when e., g. treatino two diierent .sizes ,of

rains tof'feed the in. 4about'fthe vertex o the ldrumv and the coarserparticles below. the vertex, i. e.' in.

it is attained that the magnetic particles of -ner articles of material save manual labour one may use for the 'separation as well as for the the lowest one, is prof that the` sizes loo-L same already adhere close to the drum before arrivin on the discharge side of the drum, when 1t is less easy to throw them olf.

In the drawing a drum-separator suitable for the execution of the new process is shown by way of example viz, in-

Fig. l in lateral elevation, Fig. 2 in front elevation, Fig.'3 in plana elevation, Figs. 4 and 6, with modifications, while Fig. 5 shows the adjustable partition.

Fig. 7 is a side elevation of a further 4modified form of the magnetic separator shown in Fig. 1. L

Fig. 8 is a front view thereof, and

Fig. 9 is a plan view thereof.

In accordance with the represented example, the crude material yis charged on an oscillating table fitted with two table surfaces 'aand b arranged one below the other. The crude material drops in the first in'- stance into the upper table surface a which is transformed into screen c at the charging-spot. The two streams of material wander across the table surfaces a and b to separating drum cl. By means of the guiding mechanisms (discharges) e f the two currents of material are conducted in such a way that they reach the separating surfaces of drum d side by side. At the side of drum d where the material drops the partition walls g and I are povidedfor the purpose of separating the magnetic and the non-magnetic stuff.

As mentioned above, when the seperating surfaces are arranged on the same drum, it may be desirable to regulate the throw of these surfaces by differentiating their ciryco cumferential extents. Thus, in Fig. 4, the drum d is graduated so that the separating rings are of different diameter. The coarser material will thus be fed to the separating surface z' while the finer material will be fed to the surface la, as explained.

' Substantially the same effect .may be se cured by the adjustment of the spouts, as shown in Fig. 6, according to which the liner grains are fed by the spout t to its associated separating ring near the to thereof, while the coarser particles are fed by means of the spout u to its associated separating ring at a point substantially below the vertex of the ring on its ascendmg surface. l s .the *example for demonstration pur-4 poses represents a drum with absolutely uniform diameter, it follows that the speed at the circumference of Athe separating surfaces is identical for both streams of material. Owing to said -two streams being made up of stuftl of reciprocally varying size, it is obvious that they drop off at different i hts and are thrown oli respectively at erent angles. This is complied with by each partition wall being placed in special bearings and being adjustable. According to Figs. 2, 3 and 4vonly an adjustment by he di is provided. But the rotary partition walls 'can likewise be adjusted in another manner by themselves or including their rotary axis. Each partition Wall can e. g. be arranged to slide in guide-arms located on the rotary axis or a second sheet arranged to slide on the main sheet may be provided for lengthening each partition wall. Each rotary axis may e. g. be placed on a sliding ground plate which can be fixed at various distances from the drum. Thus, according to Fig. 5, the partition wall l1. is provided with a slot or slots g and attached to an axle p by means of set screw o extending through the slot. A radial adjustment of the wall relative to the axle p is thus permitted by loosening screw o. The axle p is journaled in a bearing r and is rockable in said bearing upon the loosening of the set screw, as shown. The bearing 7' at the same time is slidable transversely to the axis of the drum in a slot provided in its associated base plate upon the loosening of bolt s. The separation into sizes of grains may of course be attended to beforehand so that these are then conducted side by sideto the separatin drum, sol that the screens onv the upper ta 1c surface can be dispensed with.

In the embodiment shown in Figs. 7 to 9 the sifting and delivery device 1 consists of the superimposed table surfaces 2, 3, and 4. Each of the table. surfaces 3 and 4 is provided with a sieve 5 and 6 respectively. The two sieves are of different sized mesh. From the three table surfaces 2, 3, 4 chutes 7, 8, 9 lead tothe separating surfaces 10, 11, 12, so that three different streams of material can be simultaneously but separately separated by the magnetic separator. The material to be separated is dumped upon the sieve 6 of the uppermost table-surface 4. The

, coarse material not falling through the sieve -conduct thevnon-magnetic material -ffalling from` the separating surfaces away.

Claims:

1. A magnetic separator comprising, juxtaposed l coaxially arranged rotating magnetic separating surfaces, means for grading the materials to be separated according to size of grains and lfeeding the granular` material as to size in separate streams to the' `separating surfaces, said means for grading comprising a plurality 'of table surfaces placed one above another, screens in all said table surfaces except the bottom one,

5 taposed coaxially arran lfeeding the granular material as to size in separate streams to the separating surfaces, the number of which corresponds to the number of streams of the material to be separated.

- size,

. 3. A magnetic separator comprising, juxtaposed coaxially arranged rotating magnetic separating surfaces, said surfaces having different diameters, means for classifying the material'fto be separated according to means for feeding the granular material as to size in separate streams to the separating surfaces, the number of which corresponds to the number of streams of the material to be separated.

In testimony whereof ificaton is signed., Dn. ING. n. o.

the foregoing Aspec- GEORG ULLRICH.

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