US2432610A

US2432610A - Self-classifying ball mill

Info

Publication number: US2432610A
Application number: US554824A
Authority: US
Inventors: John H Dryer
Original assignee: Individual
Current assignee: Individual
Priority date: 1944-09-19
Filing date: 1944-09-19
Publication date: 1947-12-16
Anticipated expiration: 1964-12-16

Description

Dec. 16, 1947. J H, DRYER l2,432,610

SELF-CLASS IFYING BALL MILL 7o/727 H Dryer Dec. 16, 1947. J. H. DRYER SELF-CLASSIFYING BALLy MILL Filed sept. 19, 1944 3 sheets-sheet 2 De. 16, 1947. J. H. DRYER SELF-@LASSIFYING BALL MILL Filed Sept. 19, 1944 3 Sheets-Sheet 3 :inventor Patented Dee. is, 1947 1 UNITED STATES PATENT OFFICE SELF-CLASSIFYING BALL MILL John H. Dryer, Moose PassrTerritory of Application September 19, 1944, Serial No. 554,824

2 Claims. (Cl. 241-44) tom of a casing and ilows upwardly therein and out through upper ends of overow pipes passing upwardly through the bottom of the casing Vand not only carry iine particles of ore upwardly to the surface of the water and out' through the overflow pipes, but also carry coarse ore upwardly in step by step movements from one set of grinders to another.

Another object of the invention is to provide a grinder 4wherein the ore is delivered through a pipe extending vertically at the center of the casing and out through the lower end of the pipe at such point that it will be acted upon by a lower set of grinders and then carried upwardly to other grinders. y

Another object of the invention is to provide grinders consisting of balls mounted between plates, certain of the plates being held against turning and others being rotated with a tubular shaft constituting anginlet pipe for the ore.

Another object of the invention is to provide thegrinder with jacks for applying pressure to thel uppermost disc and cause good grinding action to take place between the grinder balls and companion discs as certain of the discs turn with the center shaft.

Another object of the invention is to provide an ore grinder wherein discs are mounted in a casing in such manner that they may be readily removed through theopen top of the casing when necessary.

Another object of the invention is to provide an ore grinder which is simple in construction and very efficient in operation.

- In the accompanying drawings:

Fig. 1 is a sectional view taken vertically through the improved ore grinder.;

Fig. 2 is a transverse sectional View on the lin 2-2 of Fig. 1. A i

Fig. 3 is a sectional View on the line 3- 3 of Fig. 1.

Fig. 4 is a, sectional view on the line- 4-4 of Fig-1.-

Fig. 5 is a sectional view on the line 5-5 of Fig. 1. f

This improvedv ore grinder has 'a casing I upper end and the walls carry guides or tracks 3 which extend vertically and are spaced from each other circumferentially of the casing. Overflow pipes 4 extend vertically through the bottom or base of the casing in clrcumferentially spaced relation to each other and these pipes have their lower end portions threaded and screwed into opening in the base 2 and communicating with valves 5 for controlling iiow of water through the pipes from a suitable source. There has also been provided a pipe line 8, controlled by a valve 'I, and having a vertically disposed end portion or nipple 8v which is engaged in an opening 9 formed centrally of the base 2 so that water may be fed to the casing. A disc III rests upon the base 2 within the casing and this disc is formed with a central opening Il in which is ntted a. hood I2 dening a water inlet chamber and having a substantially conical top I3 formed of perforated metal so that water entering theA chamber through pipe line 6 will be discharged therefrom as streams oi water which ow upwardly in the casing to nllthe casing with water. When the casing is lled to the upper ends of the pipes 4, water will overow through pipes 4 and carry with it any material oating upon the water or of such lightness that it will be carried into the -pipes with the water.

The grinding means within'the casing includes the disc Ill and other discs I4, I5,`l6, II, I8, i9 and 2d, together with

balls

2l, 22, 23 and 24, the balls 2l being located between the discs l0 and ill and the balls 22 being located between the discs i 5 and I 6. These balls are large and, between the discs I1 and I8 and the discs I 9 and 2U, are disposed the balls 23 and 24v, the balls 23 an

'd

2,4 being of appreciably smaller diameter than the balls 2l and 22. Confronting faces of the companion discs are formed with circular grooves 25 constituting annular seats for the balls and permitting said balls to have rolling motion without moving out of their proper positions relative tov the discs and each other. as shown in Figs. 3 and 5. The large balls 2l and 22 grind coarse ore and the smallerballs 2 3 and 24 grind finer ore carried upwardly to them by the flowing water. Spacers-26, which have the form of iron strips curved longitudinally. are disposed "between discs I4 and I5 and between discsl I8 an'd I9, and have their inner ends formed with hooks 2B engaged ls, ls and le are rotary discs but the discs lo.' ls, I1 and 20 are held against rotation, and, referring to Fig. 1, it will be seen that they carry studs or stems'28 screwed into the discs and projecting .radially therefrom for engagement in the tracks 3 formed by the companion bars shown in Figs. 2 and 3. Referring to these figures, it will be seen that the stems or pins 2 3 hold the discs carrying them against rotation and also guide vertical movement of these discs in the casing during use of the grinder. A11 of the discs are formed in their peripheral faces with sockets 29 so that pins may be tted into the sockets and then engaged by 'a grapple for hoisting the discs out of the casing or lowering them into place.

A hollow shaft 30, rectangular in cross section, extends vertically in the casing over the nozzle I2 and through openings of the discs and is connected with the rotary discs I4 and I5 by keys 3| so that these discs turn with the shaft, the discs I8 and I9 being formed with openings having squared portions, (see Fig. 4) to snugly receive the shaft and cause the'm to turn with the shaft. The other discs are formed with circular openings throughA which the shaft passes and attention is called to the fact that the openings of the discs are of such size and shape that crushed ore' and water may shaft carries a thrust collar 38 held thereon by set screws 39. Within the hollow shaft fits the elongatedspout 40 of a hopper 4I which is supported by a suitable number of braces 42 and may be of any size desired. -The crushed ore is fed to the hopper and from the hopper it ows through its spout and into the shaft 40 down which it flows into the tube 32. After flowing Athrough the tube the ore enters the lower portion of shaft 30 and is delivered therefrom directly over nozzle I3, so that the streams of water discharged from the nozzle will carry the crushed ore upwardly through the center openings of the discs. The heaviest ore remains upon the disc Iii for grinding by the balls 2| but the lighterore is carried upwardly to the other discs, a portion of the ore being delivered between the discs I5 and I6 for grinding by the balls 22 and other portions being carried upwardly and deposited between discs I1 and I8 for grinding by balls 23 and between discs I9 and 20 for grinding by balls 2.4. It will thus be seen that the crushed ore will be progressively acted upon by the balls as it is carried upwardly. Eventually, the ore will be reduced to such state of flneness that it will float upon the water or be suspended in the water and pass out with the water through the overflow pipes 4. A pulley 43 is carried by shaft 40 and is preferably located between beams 31 where it will be out of the way, and, when a belt is engaged about this pulley, rotary motion may be transmitted from an engine to the shaft.

It is necessary to apply downward pressure to the discs so that wear upon the balls and discs .will be compensated for and also suflicient pressure applied to grind the crushed ore. Therefore, there havebeen provided hydraulic jacks 44 carried by I-beams 45 and extending downwardly therefrom. These jacks carry collars 46 at their lower ends and these collars are provided with set downward pressure to the discs and, by adjusting' the jacks, tension of the springs may be controlled. It will thus be seen that the desired pressure may be applied for efilcient grinding of the ore carried to the discs by the upwardly moving stream of water.

' In order that additional crushed ore may be fed'.

to the grinding discs and balls, there has been provided an auxiliary hopper 5I which is dis-s posed over the upper disc with its spout 52 fitting snugly into the center opening of this disc. The ore fed to this hopper or funnel passes downwardly 'through' its spout and as it leaves the spout 5 2, it

flows downwardly through openings of the other discs through the upwardly moving water which vseparates the crushed ore and allows heavy ore to reach the lower discs and delivers the lighter ore to the upper discs.

Having thus described the invention, what is claimed is: f

l. An ore grinder comprising a casing having a Awater inlet at its bottom, a plurality of substantially'horizontal discs in said casing, all having aligned openings at their centers, certain of said discs, including upper and lower ones, being nonrotatable, and others being rotatable and disposed between non-rotatable discs, balls vbetween confronting faces of companion rotatable and nonrotatable discs, a hollow shaft non-circular in cross section disposed vertically in said casing over the water inlet and passing through the aligned openings formed in said discs centrally thereof, said shaft being connected with the rotatable discs for rotating the same, a tubularl drive shaft disposed vertically over said casing and entering the rst shaft through the upper end thereof, said drive shaft conforming to the cross sectional shape of the first shaft and tting lsnugly therein for turning the rst shaftwith it, means for rotating the drive shaft, ineans for delivering crushed ore into the drive shaft through the upper end thereof, the openings in the discs through which the rst shaft passes having portions of their walls spaced from the said shaft and providing ore passages about the rst shaft through which ore is carried upwardly'by water owing upwardly from the water inlet, a hopper over the top disc surrounding the first shaft and having a depending neckiitting snugly into the opening of the top disc for delivering an ladditional supply of ore into the casing through the center passages of the discs, and means Vfor applying downward pressure to the top disc.

2. An ore grinder comprising acasing open at its top and having a centrally located water inlet at its bottom, a plurality of -substantially horizontal discs in said casing disposed one above another, and all having aligned openings at their centers, certain of said discs being. rotatable, and others companion thereto being non-rotatable, the upper one of said discs being anon-rotatable disc, balls between confronting faces of companion rotatable and non-rotatable discs, a. hollow shaft disposed vertically in said casing over the water inlet and passing downwardly through openings formed in said discs centrally thereof with its lower end spaced upwardly from the water inlet, said shaft being engaged with the rotatable discs for rotatingsame, with the shaft,

shaft, a tubular drive shaft disposed vertically over said casing and entering the rst shaft through the upper end thereof, and having engagement with the rst shaft for turning the rst shaft with the drive shaft, means for rotating the drive shaft, means for deivering crushed ore into the drive shaft through the upper end thereof, ore leaving the lower ends of said shaft being carried upwardly through the water passages by the upwardly moving water, an overhead support provided with a bearing rotatably receiving the drive shaft, jacks depending from the support, the non-rotatable upper disc being provided with sockets, and' springs between the sockets and the jacks for urging the discs downwardly.

JOHN H. DRYER.

REFERENCES CITED The following references are of record in the 5 le of this patent:

Number UNITED STATES PATENTS