US1286511A

US1286511A - Magnetic-pulley separator.

Info

Publication number: US1286511A
Application number: US21456818A
Authority: US
Inventors: John P Bethke
Original assignee: DINGS MAGNETIC SEPARATOR CO
Current assignee: DINGS MAGNETIC SEPARATOR Co
Priority date: 1918-01-31
Filing date: 1918-01-31
Publication date: 1918-12-03
Anticipated expiration: 1935-12-03

Description

J. PfBETHKE. MAGNETIC PULLEY SEPAR'TOR.

APPLICATION min 1m31. 191s.

Patented Dec. 3, 1918.

2 SHEETS-*SHEET 1 `1. P. BETHKE.

y MAGNETIC PULLEY SEPARATOR.

APPLICATION FILED JAN-31.1918.

Patented Dec. 3,1918. I

A 2 SHEETS-SHEET 2.

- lldliillllo mmm-mmm,

Specification ot Letters Tatent.

patented nee... a, iota application tiled lanuary ttl2 tutti. lteriat Matlab-ttt.

To all fwtmttit may' concern.:

Be it lrnownfthat l, JOHN l?. Burman, a citizen of the llnit'eld States, and resldentof Milwaukee, in the county of Milwaukee and @tate of Wisconsin, have invented new and useful llmprovements .in Magnetic- Pulley Separatore, of which thejfollowmg 1s a description, reference being had to the accompanylng drawings, which are a part of this lll i pulley type it has -been necessary to enlarge` speciticatiom The invention relates to magnetic separa tors and more particularly to that' class of separators in which a magnetic pulley or drum is used in conneition with a conveyer belt passing over said pulley or drum and carrying the material to be separated.

.ltleretofore in'v separators of the magnetic or increasethe size of the drum to increase the capacityof thefinachine. rlhe objectof 'the present invention is to provide a means used in" connection with the magnetic pulley type of separator to increase the capacity of the machine for any given size of magnetic pulley and also to produce a machine of increased etliciency..

A further object of the invention is to provide means by .which the separation of magtti " terial to be separated. may enter, and'l which f netic from non-magnetic material in the magnetic pulley type-of-separator is more positive than that heretofore used.

Another object of the invention is to providean extenf'ded magnetic held ahead of the magnetic pulley for the purpose of magnetically charging the magnetic material before it comes within the sphere of magnetic influence of the magnetic pulleyto thereby oven.

come the initial reluctance ofthe magnetic 'material and thus facilitate its separation from the non-magnetic material while pass ing overthe magnetic pulley.

Another object of the invention is'to utilize for magnetin separation that part of the nlagneti'fy Held of thermagnetic drum or pulley which lies between the 'upper and lower portions of the conveyor-belt.

IAnother purpose of the Ainvewtion lis to provide an extended lield into which the mais. ahead of the magnetic drum or pulley to produce a `downward pull on the magnetic particles as they pass over the belt and also having a tendency to turn these magneticA particles so that their poles will be transring v l2;

verse of the conveyer belt to insure a positive separation.

rlhe invention further consists in the several features hereinafter setforth.

ln the drawings;

.Figure l isa plan view of the magnetic `separator embodying the invention;

ley and of the separator-showing a .different l arrangement of the coils from that of lFig. l;

. Fig. 8' is a section taken'on the line 8-8 .of

-liig 7;

'llhe magnetic pulley 8 is of usual construction and is mounted upon the shaft 9. rllhis pulley is provided with a series of disks i0 mounted upon the shaft 9 and serving as pole pieces. Coils l0 mounted upon the shaft 9 between said pole pieces are so wound that the pole pie'es will be of alternate op posite polarity as indicated in Figs. 3, 6 and 8 and said coils are each surrounded by rings ll preferably of noiigmagiietic material to serve as a protection for the coils. rlhe shaft 9 is provided at one end with the usual tollector ring l2 for conveying the energizing current to the coils 10 of the pulley and said current is conducted through live wires ll to brushes l2 'bearing upon 'the collector A belt llt. preferably `of rubber or other non-magnetic materlaltserves as Va conveyer for' the material to be separated. 'the mate-v rialis fed to said beltthrough a hopperd or any other suitable meansl 'l`he belt ea# tends over the magnetic pulley 8, and also overa pnlleyor drum' 16. rlFhe shafts of thesegpulley's 8 and ltiare supportedin any suitable mannerand the shaft 9' isrotated from any suitable source of power, the shaft 9 being rotated to move the belt forwardly to carry the material upon thev top of the conveyer over the magnetic pulley. its is usual in mafliines of this kindthe non-magnetic material drops vertically 'from the lllll.

lldll..A

outer surface of thebelt while passing over the magnetic pulley while the magneticmaterial adheres to the belt 'until it moves out of contact with the. lower` portion of the pulley and as the belt itself is of non-magnetic material, the magnetic material will drop therefrom into a receiver (not shown) immediately after the belt leaves the pulley surface.

With the usual type of magnetic pulley separator, the pulley alone accomplishes the separation but when said pulley is run at a high speed to increase the capacity of the machine I have found that the material cannot be magnetically charged quick enough for a given size of pulley to accomplish efiicient magnetic separation and consequently for increased capacity the size ofthe magneticlpulley vwould have to be increased.

To overcome this difficulty, I provide `,a magnetic eld ahead of the pulley into the magnetic iniuence of which the material-to be separated comes before it passes over the magnetic pulley whereby the capacity of the machine is increased for any given size of pulley and also the separation efficiency of the :machine increased.

In Figs. 1 to 4 inclusive this magnetic field is created by auxiliary pole pieces 17 which are of like polarity to the adjacent pole piecesJ of the magnetic pulley. The ends 18 of the auxiliary pole pieces nearest to the magnetic pulley are shaped to conform to the surface of the magnetic pulley so as to provide an` uninterrupted magnetic zone. v These pole pieces 17 have pole shoes or polar projections 19 lying beneath the belt and extending lengthwise thereof and core portions 20 which are'connected together at their lower ends by a yoke'21'which serves tol complete the magnetic circuit. Coils 20 lsurrounding the ccries 2O are provided for energizing the auxi ry pole pieces and are so wound as to magnetically charge the pole pleces so that they will be of alternate oppo- Asite polarity and of like polarity to the poles' of the magnetic pulley adjacent to them. These coils are shown connected up inseries with each other and through wires 21 to Athe live` wires 13 though they may be sepa- .'rately energized or connected up to a different source of current than that for the pulley, as -will be readily understoodby those skilled in this art.

With this construction the energizati'on of the coils produces a magnetic field' ahead of the pulley as the magnetic lines of force pass from `one polar projection to thev other of opposite polarity, said lines of force creatlng a magnetic field above the belt ahead of the ,pul ey which draws downthe` magnetic materla '-into close contact with the belt, and

lalso magnetically influences the magnetic material -before the material enters the magnetic field produced Vby the pulley and there- 1,ase,511

yovercome by the usual magnetic pulleys nor can the reluctance of the material be overcome.

In Figs. 5 and 6 I show auxiliary pole pieces 22 which are of similar polarity to that of the adjacent pole pieces of the magnetic pulley. Theends 22 of these pole pieces nearest the magnetic pulley are of considerable area and are shaped to conform to the surface of the magnetic pulley. In this construction no magnetizing coils are used but the magnetic field along the rear f surface of the pulley is used to induce magnetism in the pole pieces 22. These pole pieces 22 have their sides 23 tapered so as to converge the magnetic lines of force to- Ward their tops 24 and to provide against loss between the surfaces. The magnets 22 are held in position between the upper and lower portions of the belt 14 by means of rods 2-1 which may be secured t0 any suitable support.

In Figs. 7 and 8 I show another magnetic field formed by vpole pieces 25 similar to the pole pieces 22 just described and of similar polarity to the adjacent pole pieces of the magnetic pulley. 'These pole pieces are energized by horizontally disposed coils 26 whichare provided with cores 27 extending vbetweenthe pole pieces and a supporting rod or shaft 28 is used to carry the coilsv and pole pieces. The coils are connectedv up inanv suitable manner to a'source of current.

- fore permit of running the pulley at a higher speed, and with/better or more positive results because of the more thorough saturation of the material. This action further has a tendency to turn the magnetic particles on the belt so that their poles will be transversely of the belt to insure a more positive separation, as for instance if the magnetic material is in the form of a rod when the rod runs lengthwise of the belt it is apt to` i fall ofi the pulley along vvith the non-magnetic material, but when it isturned transversely of the belt it Will be held until the belt leaves the pulley.

It Will also be noted that in all the forms here shown that part of the magnetic field of the'niagnetic drum Which'lies between the upper and lower portions of the conveyer belt is utilized to produce an induced magnetism in the auxiliary magnets and this is particularly true of the constructions shown in Figs. to 8 inclusive.

lio

.. said 1 i am aware that the particular`constructions' herein shown and described lare ca pable of some changes and l therefore de- --sire it to be. understood that .such variations` in constfruetion .-a's come Within the scope of theiappended'elaims I deem to .be Within the spirit Q f'rny intention.

What (I'claiina invention is: *1. ln an annular'magnetic separator, the combination With a magnetic pulley having magnetic poles of alternate opposite polarity and a `conveyer running over said pulley;

of auxiliary magnets having poles disposed immediately adjacent the poles of the magnetic pulley andl being of similar polarity to said poles, said magnets being disposed beneath the conveyer directly -in front of the pulley, and means for energizing said magnets.

2. In a magnetic separator, ythe combination With a magneticY pulley having verti' callyl disposed magnetic poles of alternate opposite polarity and a -belt running over said pulley, of auxiliary magnets having poles extending lengthwise 'of the belt and disposed beneath the upper run of the belt immediately adjacent `the magnetic poles of said pulley and bein'gof' similarpolarity to energizing said oles, and means for auxiliary magnets.

.disposed immediately adjacent the poles of said magnetic pulley and being of similar polarity thereto, said auxiliary magnets being disposed in front of the pulley betweenthe upper and lower run of the belt and Within the magnetic influence 4of the pulley and having a portion of the pole pieces disposed beneath ,the belt and in closeproximity thereto, and means for energizing said auxiliary magnets to create'a magnetic field ahead of the magnetic pulley to facilitate separation of the magnetic from the nonmagnetic'material carried by the belt.y

.4. lin a magnetic separator, the combina`` tion, with a magnetic ptrllegflzl having spaced apart annular polejpieces and coils interposed between said'pole pieces to energize said pole pieces so that they will be of alten nate opposite polarity anda belt running j over said pulley, of auxiliary magnets having polar projections' disposed directly beneath the, upper run of the belt in close proximity to said pulley7 said polarY projections being disposed in line with the `pole pieces of the magnetic pulley and being of similar polarity `and inuenced thereby, .and coils for energizing said auxiliary magnets 'to create-a magnetic field ahead of that created by the magnetic pulley to overcome the magnetic reluctance of `themagnetic material passing over the belt before said Vmaterial enters-.the magnetic field of the pulley.

ln testimony whereof l aiix my signature.

' JOHN P. BETHKE. p