US1161299A - Magnetic separator. - Google Patents

Description

. IVI. FOLSOIVI.

MAGNETIC SEPARATOR.

APPLICATION FILED MAR.10.1915.

Patented Nov. 23, 191V.

a /6 @oy e/ ROBERT M. FOLSOM, OF READING, MSSACHUSETTS, SSIGNOR 'lO NEW ENGLAND GAS & COKE COMPANY.

MAGNETIC SEPARATUR.

' Specification of Letters Patent.

Patented Nov.. 23, 1915.

Application filed March 10, 1915. Serial No. 13,1171.

his invention relates to magnetic separators, and is more especially, though not exclusively, concerned with a separator for causing the removal of iron and steel objects, such as bolts, spikes and the like, from coal which is being fed to a breaker, whereby the latter is protected from injury which would be likely to occur, if it were not for the provision of the magnetic separator in connection therewith.

My invention will be best understood by reference to the following specification, when taken in connection with the accompanying drawings of one specific embodiment thereof, while its scope will be more particularly pointed out in the appended claims.

ln the drawings: Figure 'l is a cross-sectional view of a -magnetic separator embodying my invention, the hopper and breaker casing being partly broken away; and Fig. 2 is an elevation of the same, with a portion of the hopper and a portion of the cylinder in central longitudinal section the supporting frame-work being omitted.

Referring to the drawings, and to the embodiment of my invention which l have selected for illustration, I have there shown a .magnetic separator comprising means for creating a suitable magnetic field, the same comprising one or more, herein a plurality of,magnets 3, herein electromagnets, having appropriate windings for, and provided with lead wires 5, which in practice will be lconnected to the pole pieces of a suitable into the magnetic field may be regulated.

The materials gravitating from the outlet of the hopper may be delivered onto a suitable surface, such for example as a traveling surface 9, herein the circumferential surface or periphery of a hollow,

non-magnetic cylinder ordrum 10, which forms a convenient housing for theelectromagnets 3. The latter may be sup orted by any appropriate means, but erein are provided with split collar pieces 11, encircling and clamped about a fixedhollow shaft 12, by means of clampingbolts 13, whereby they are held fixed in definite positions of adjustment. This shaft is made hollow to constitute a convenient conduit for the lead wires 5, the circumferential wall of the hollow shaft for this purpose being provided with a series ofperforations 14, through which the lead wires extend from the electromagnets to the interior of the conduit.

As the coal or other material is deliveredl onto the cylinder 9, it will naturally gravitate to .a point therebelow. The magnetizable objects, however, will be attracted by the magnet or magnets, and will tend to remain within the field of the latter. Each of the magnets, as herein shown, is provided with a generally segmental'pole piece 15, which, as herein shown, is approximately ninety degrees in extent. rl`he lines of force of the magnet will naturally extend a considerable distance circumferentially beyond the ends of this pole piece, and when the extent of the latter is as shown in the drawing, the effective field of the magnet includes about forty per cent. of the area of the drum, its extent being indicated by the lngth of the are A. lt must be evident, however, that the magnetizable objects would naturally tend to remain within the field' of the magnet, were it not for the provision of suitable means to cause them to be carried out of the field. Whilethis might be accomplished by other means, I have herein provided a movablemagnetizable body 16, preferably composed of soft iron, and having a path of movement into and out of the magnetic field, whereby the latter may be extended intermittently in the general direction of travel of the materials. Preferably, this body is caused to revolve about the axis of thedrum 10, so that it will enter the magnetic eld at the upper portion of the latter, and leave it at the lower portion. As a con- 'iso venient means for imparting the desired rotation to the magnetizable body 1`6, the same is herein secured to thedrum 10, and the latter 1s mounted for rotation upon the shaft 11. The terminal portions of the shaft are secured to asuitable frame 17, whereby the drum is supported, and the latter receives its rotation from apulley 18, secured to the drum and driven by abelt 19. Preferably, themagnetizable body 16 is in duplicate, as

- shown in Fig. 2, although this is not essenalthough it will naturally tend to be carried Y along somewhat in the general direction of the rotation of thedrum 10. When, however, the advancingedges 21 of themagnetizable bodies 16 encounter the magnetizable object or objects, they will carry the latter along. It should here be observed that themagnetizable bodies 16 are provided withrear portions 22, which remain within the normal magnetic field of themagnets 3 after the advancingportion 21 has traveled therebeyond, and by this means, the normal field is extended temporarily in the direction of rotation of the drum. Hence, the magnetzable objects will be carried by the advancingedge 21, and the attraction of the body orbodies 16 for the magnetizable objects will exist until the rearwardly extending portions 22- pass out of the normal field of the magnet, whereupon the body orbodies 16 are instantly demagnetized, and the loose objects heretofore carried by the magnetism thereof will yield tothe influence of gravity, and fall. As herein shown, the

magnetizable bodies 16 are generally U- shaped in form, and their terminal portions extend in a generally rearward direction circumferentially along the surface of the drum, as clearly-shown in Fig. 2.

The non-magnetizable materials, such for example as coal, will `naturally gravitate from the surface of the rotating drum, and

will fall into asuitable receptacle 23 provided therefor, said receptacle in the present instance being shown only partially, but in practice will constitute the housing for the coal breaker. The latter in practice usually comprises two or more crushing cylinders provided with suitable teeth or other instrumentalities for crushing the large lumps of coal. In practice, if bolts, spikes or other such objects come into contact with these teeth, they are very apt to becomey broken, and the crusher seriously damaged, but by the use of the described magnetic separator,

this danger is eliminated and the crusher protected from injury.

While I have herein shown and described one specific embodiment of my invention for illustrative purposes, and have disclosed and discussed in detail the construction and arrangement incidental to one specific application thereof, it is to be understood that the invention is limited neither to the mere details or relative arrangement of parts, nor to its specific embodiment herein shown, but that extensive deviations from the illustrated form or embodiment of the invention may be made, without departing from the principles thereof. Having thus described my invention, what I claim and desire by Letters Patent to procure is:

l. A magnetic separator comprising, in combination, means for creating a magnetic field; means for causing the materials to pass within said field; and a movable magnetizable body having a path of movement into and out of said field, said body having an advancing edge to engage magnetizable objects within said field and having a receding rear portion which remains within the normal magnetic field after the advancing portion has traveled therebeyond, whereby the magnetic field is temporarily enlarged by said body.

2. A magnetic separator comprising, in combination, means for creating a magnetic field; means for delivering the materials into said field; means having a traveling surface onto which the materials are delivered; `and a magnetizable body carried by said surface alternately into and out of said field, said body having an advancing edge to engage magnetizable objects within said field and having a rear portion which remains within the normal magnetic field after the advancing portion has traveled therebeyond.

3. A magnetic separator comprising, in combination, means for creating a magnetic field; a rotating non-magnetic cylinder onto which the materials are delivered; and a magnetizable body carried by said cylinder into and out of said magnetic field, said body ,having a generally' U-shaped form with its terminal portions extending in a generally circumferential direction.

4. A magnetic separator comprising, in combination, means for creating a magnetic field; a rotating non-magnetic cylinder onto which the materials are delivered; and a magnetizable body carried by said cylinder into and out of said magnetic field, said body having a generally U-shaped form with its terminal portions extending rearwardly in a generally circumferential direction.

5. A magnetic separator comprising, in combination, means for creating a magnetic field; a rotating non-magnetic cylinder onto inemee which the materials fare deliyered; and e ing s main bortibn 21 end an extension `22 10 magnetizable body carried by` said cylinder movable through the eld of said magnet.

- into and out of said magnetic field, .said 1n testimony whereof, I havesigned my bodyl having a portion extending along Aan' neme to this specification, in the presence of element of the cylinder and a, rearward extwo subscribing witnesses. y

tension therefrom. f HUBERT M. FOLSM.

6. A magnetic separator comprising,f in Witnesses:

combination, the magnet "3, the traveling Louis A. JONES,

surface 9 and thema'gnetizable' body -hav; CLARA L. STUART.

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