US1224580A - Ore-separating machine. - Google Patents

Description

H. H. THOMPSON & A. E. DAVIES.

ORE SEPARATING MACHINE.

APPLICATION FILED ocT. I3. |915.

Patented May 1, 1917.

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ORE SEPARAHNG MACHINE.

APPLICATION man ocT.13. 1915.

,224,580. Patented May/1,1917.

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H. H. THOMPSON & A. E. DAVIES.

DRE'SEPARATING MACHINE.

APPLICATION FILED ocr. la. 1915.

Patented May 1, 1917.

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HERBERT HUBAND THOMPSON, 0F ALDRIDGE, AND ALFRED EVAN DAVIES, OF HOCKLEY HEATH, ENGLAND.

ORE-SEPARATING- MACHINE.

Application led October 13, 1915.

T0 all whom t may concern:

Be it known that we, HERBERT HUBAND THOMPSON, subject of the King of Great Britain. residing at Meadowside, Aldridge,

Staffordshire, England, manager, and AL- FRED EVAN DAvms, subject of the King of Great Britain, residing at Abbey Farm, Hockley'Heath, Warwickshire, England, secretary of a limited company, have invented certain new and useful Improvements in Ure-Separating Machines, of which the following is a specication.

This invention comprises improvements in magnetic ore separating machines and relates particularly to means whereby the Separation of ore may be carried out in a much simpler and more effective manner than is possible with present machines. It is applicable to separating materials, which vary in the degree of their magnetic permeability from each other and from non-magnetic substances.

The invention relates to ore separators of the type having an armature rotating adj acent to the ore carrier and to stationary pole pieces so that the ore is subjected to the magnetic influence of the armature which separates the magnetic from the nonmagnetic particles.

One of the objects of the invention is to effect a preliminary separation of the more highly magnetic material, such as iron on the same machine for dealing with the feebly magnetic and more valuable ores. Another object is totreat materials of different magnetic permeabilities on the same armature disk by the simple bodily adjustment of the disk.

Other objects and novel features are more particularly set out hereafter and in the appended claims.

On the drawings- Figure l is a diagrammatic view of a simple form of the invention.

Fig. 2. is an elevation of a machine made in accordance with the invention.

Fig. 8. is a plan of same.

Fig. 4f. is a sectional view of a suitable construction of disk armature.

Fig. 5. is an enlarged sectional view show- Specication of Letters Patent.'

Patented May 1, 1917.

SerialiNo. 55,618.

ing our method of mounting the armature spindle for vertical and angular adjustment.

Fig. 6. is a plan of Fig. 5.*with the driving pulleys omitted.

In the embodiment of the invention in its simplest form represented by the diagrammatic view at Fig. l. an iron disk a is mounted horizontally upon a vertical shaft b which is mounted in suitable bearings. This vertical shaft Z) can be driven by any suitable means and at any convenient speed according tothe nature of the material to be treated and to other conditions. The armature a is adapted to rotate slightly above two opposed pole pieces c cl of suitable shape at their extremities and niagnetized by a strong electric current and a rheostat is preferably provided for varying the degree of magnetization of the pole pieces. yThe pole pieces may be beveled at their upper surfaces so as to produce a nose or ridge e which forms the part of the pole piece nearest to the disk armature a this formation serving to concentrate the magnetic lines `of force at the nose or ridge of each pole piece and thereby to render the magnetic iniuence of the adjacent portion of the armature more intense. The effect of the magnetization of the pole pieces is to induce a strong magnetic field running diametrically across the disk from one .edge to the other and the intensity of this magnetic field is increased or concentrated at the edge of the disk by making the disk tapered toward its periphery. The magnets may be mounted so that their pole pieces may be adjusted to vary the distance between them.

A slight distance above the two pole pieces and traveling in a direction from one pole to the other is an endless band f upon which the granulated material to be treated is delivered by suitable means, such as a hopper or funnel the outlet from which is controlled by a needle valve or other suitable device. This traveling band, which is nar'- rower than the diameter of the rotating armature is spaced away from the pole pieces to suit the requirements of the material to be treated and passes between the pole pieces and the rotating armature. The armature is preferably adjustable so that the distance between the bottom surface of the disk a, and the traveling band f, may be adjusted to suit requirements. In some cases this distance may be reduced to one sixteenth of an inch or less7 or it may be increased considerably beyond this amount, according to the nature of the material to be separated and the conditions governing the treatment thereof.

rlroughs or chutes are arranged at suitable positions below the periphery of the armature disk on each side of the traveling bandl into which the grains or particles of magnetic material picked up by the armature are dropped when carried around out of the zone of influence of the pole pieces.

As shown a second disk armature g is mounted in advance of the main disk a the disk g being magnetized by induction from the nearest pole piece c of the magnet., This preliminary disk g 'should preferably be adjustable vertically and also horizontally so that its distance from the band and from the pole pieces may be varied.

The function of the disk g is to effect a preliminary separation of the highly magnetic substances such as iron7 magnetite, etc.,

which it is desirable to remove before the more valuable and slightly magnetic materunning in bearings carried by two parallel frame bars m. A ball thrust bearing is preferably providedtc take the pull of the magnets upon the armatures.

The belt f is operated by a-.belt or equivalent driving a variable speed pulley m on the spindle n of the belt pulley j before referred to. The other end ofthe spindle n is provided with a variable speed pulley or cone pulley o from which is driven the pulley p on a cross shaft g. Upon the shaft g is a flange pulley r from which a half crossed belt drives the flanged pulley s on the spindle ZJ to enable that spindle to be rotated at various speeds. The spindle Z may be driven from the spindle Z over pulleys Z and u and it may be desirable to drive the spindle Z faster than Z1 so that centrifugal force facilitates the removal of the more magnetic material from portions of the armature g as they pass the neutral Zone.

On each side-of the belt f an inclined side bar such as e is provided preferably of nonmagnetic material and to these bars suitable collecting hoppers or pans are secured on each side adjacent to the armatures a and g to receive the magnetic material that falls off when the portion of the armature to which it is adhering passes out of the immediate field of the magnet pole pieces.

If desired the side bars o may be mounted by an adjustable frame w to the pillars m of the main frame and can be raised and lowered by such means as the screw g/ at each end. On this frame w we may mount rollers e below the belt f so that by slacking the belt by adjustable screws c'and raising the frame by screws g/ the ore carrying belt f and the bars fu carrying the hoppers are simultaneously raised from the magnet poles.l

By this means the distance of the ore carrier from the magnets may be readily adjusted while the adjustment of the spindle b and Z varies the height of the armatures a and g from the material on the belt.

F or the adjustment of the spindles vertically a sleeve z' surrounding each spindle may be raised by the screws 2 when the clamp 3 of the bearing plate has been slackened to release the sleeve and permit it to move vertically. To adjust the spindles slightly at an angle to the vertical nuts 5 (Fig. 6) are slackened and the pins 6 adjusted to impinge on the plate 7 and tilt the bearing plate on its hinge 8; the nuts 5 being tightened up again to maintain the angle.

It will be observed that in this example shoes are shown on the magnet pole pieces and a pin and slot connection 7 is shown which will permit of the adjustment of the distance apart of the shoes instead of adj usting the magnet poles bodily on the frame as before set forth.

In operation (for instance with Wolfram ore) after the electro-magnets are energized, the armature or armatures is or are rotated and the endless traveling band f put in motion, the crushed ore being fed on to the latter at a convenient speed. The band firstpasses under the subsidiary armature which separates the highly magnetic materials such as iron7 this being dropped into suitable receptacles when (owing to the rotation of the armature bringing the corresponding portion of its periphery out of the magnetic field) the magnetic influence on the particles has weakened, or ceased. The particles remaining on the band then consist of non-magnetic particles (such as silica) and slightly magnetic ore particles. As soon as the-se latter come adjacent to the edge of the periphery of. the main rotating armature they are attracted on to the same and are taken out of the zone of magnetic influence, being ultimately dropped off from the said edge or under surface of the armature into one or other' of the troughs or chutes, according to the direction of the rotation of the armature. If any of the particles fail to be attracted to the armature at the first node or region of influence they will on passing the aXis of the armature be subjected to the action of the armature at the second node or region of influence and be attracted to the edge or under-surface of the armature at that point and be carried away and dropped into the other chute or receptacle. For feebly magnetic material of a fine character or which has been reduced to dust if there is any tendency to adhere to the armature, brushes or wipers may be provided for its removal. The particles which remain will pass on and be delivered into a further receptacle for the non-magnetic material, silica etc.

Thus it will b'e seen that according to our invention the separating apparatus is greatly simpliiied and we have found in practice that the eiiiciency of the apparatus is very high.

If it is desired to separate materials which vary in the degree of their magnetic permeability from each other and from nonmagnetic substances, we provide along the traveling band a series of rotating arma tures, each at a certain distance from the band and under a certain magnetic influence so that materials, for example of the first degree of permeability will be acted upon by the first armature and separated; materials of the second degree of permeability will be acted upon by the second armature and accordingly separated; and so on, any suitable number of armatures and pole pieces being provided.

Or with the same object in view we may arrange the disk armature so that its surface is at an angle to the ore carrier instead of parallel thereto so that two fields of different intensities are set up, and the same disk will deal with material of two different magnetic permeabilities.

The section of the armature may also be varied considerably in order to concentrate the magnetic influence at the portion of the edge thereof in the magnetic field, and as an example we have shown in section at Fig. 4. a disk with a concave under surface instead of a plane surface.

We claim:

1. In a magnetic separator, the combination of a main rotary disk armature, a car rier moving beneath the same, a pair of magnet poles under the main armature and below said carrier, a preliminary separating disk armature in advance of said main armature and located within the region of influence of a magnet influencing said main armature, said disk armatures having their faces toward said carrier, and means for rotating both of said armatures to carry attracted material from the magnetic fields.

2. A magnetic separator comprising in combination an electric magnet a main rotary disk armature arranged above and within the influence of said electro-magnet, a carrier for the materials to be treated, said carrier being less in width than the dialneter of the armature and traveling through the space between said armature and said magnet, and a second rotary disk armature in advance of said main armature and located within the inuence of said magnet influencing the main armature, said second disk armature effecting a preliminary separation of the more highly magnetic substances from the materials to be treated, both said armatures having their faces toward said carrier.

3. A magnetic separator comprising in combination a main rotary disk armature, an electro-magnet, said armature being arranged above and within the influence of said electro-magnet, a carrier for materials to be treated, said carrier being less in width than the diameter of the armature, and traveling through the space between said armature and said magnet, a second rotary disk armature in advance of said main armature and located within the influence of said magnet, both said armatures having their faces toward said carrier, and means whereby said disk armatures may be bodily raised or lowered to adjust their distances from the carrier and from the magnet.

t. A magnetic separator comprising in combination a main rotary disk armature, an electro-magnet, said armature being arranged above and within the influence of said electro-magnet, a carrier for the fmaterials to be treated, said carrier being less in width than the diameter of the armature and traveling through the space between said armature and said magnet, a second rotary disk armature in advance of said main armature and located within the influence of said magnet, said armatures having their faces toward said carrier, said magnet having two pole pieces, and means whereby said pole pieces may be adjusted closer together or farther from each other.

5. A magnetic separator comprising in combination an electro-magnet, a rotary disk armature arranged above and within the influence of said electro-magnet, a carrier for the materials to be treated, said carrier being less in width than the diameter of said armature and traveling through the space between said armature and said magnet, and means for bodily adjusting said armatureby inclining its axis so that the distance from the magnet in diametrically opposite portions is varied.

6. A magnetic separator comprising in combination a rotary disk armature, an electro-magnet, said armature being arranged above and Within the influence of said electro-magnet, a Carrier for the material to be treated, said carrier being less in Width than the diameter off' the 'armature and traveling through the space between said armature and said magnet, means for bodily adjusting said armature by inelining its axis so that the distance from the magnet of diametrieally opposite portions is varied, and said magnet having two poles, and means for relatively adjusting said poles. v

In testimony whereof We aiix our signatures in presence of tWo Witnesses.

HERBERT HUBAND THOMPSON ALFRED EVAN DAVIES. Witnesses:

F. GILBERT BRETTELL, CECIL F. H. WHITEHOUSE.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C.

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