US1054415A - Ball or pebble mill. - Google Patents

Description

G. F. W. HOPE & H. W. J. CHEFPINS. BALL 0R PBBBLE MILL.

lAPPLICATION FILED JUNE 29, 1912. 1,054,41 5, Patented Feb. 25, 1913.

4 SHEBTS-SHEBT l.

@we @975W /W @M/@fw G. F. W. HOPE & H. VW. J. CHEFFINS.

BALL 0R PBBBLB MILL. APPLICATION FILED Juul.` 29

Patented Feb. 25, 1913.

4 EERSTE-SHEET 2.

if] W G. F. W. HOPE & H. W. J. CHBFFINS. BALL 0R PBBBLB MILL.

APPLIoATIoN FILED JUNI; 29, 1912.

1,054,41 5, Patented Feb. 25, 1913.

4 SHEETS-SHEET 3.

G. F. W. HOPE & H. W. J. CHEFPINS. BALL 0R PEBBLB MILL.

APPLIoMeoN FILED JUNI: ze, 1912.

1,054,415A Patented Feb. 25, 1913.

4SHEETS-BHEET4.

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15u/enfans @MM UNITED STATES PATENT OFFICE.

GEORGEFOUNTAINE WEARE HOPE, OF STANFORD LE HOPE, AND HAROLD WILLIAM JOSHUA CHEFFINS, OF SEAFORD, ENGLAND.

BALL OR PEBBLE MILL.

Y To all whom it may concern Be it known that we,l GEORGE FOUNTAINE VEARE Horn, a subject of thel King ot' Great Britain, residing at the Bungalow, Stanford le Hope, in the county of Essex, England, and HAROLD WILLIAM JOSHUA CHEF- rINs, a subject of the King of Great Britain, residing at 5 Marine Parade, Seaford, in the county of Sussex, England, have invented new and useful Improvements in Ball or Pebble Mills, of which the following is a specification.

. a separate settling chamber by compressed air or by means of a fan.

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According to our invention we arrange in the mill .or the like, which is conveniently` in the form of a rotating cylinder mounted on rollers as above described, a stationary chamber or a series of chambers which may be arranged in an upright position on the central axis of saidmill or if found desirable. at any convenient angle above the center of said mill. The said stationary chamber is provided with an inlet at its upper end and an outlet leading to the hollow trunnicn or stationary disk or disks at the end or ends of 'the cylinder. The inlet of said chamber is provided with a suitably vshaped hood adapted to prevent the entrance into the chamber of any large particles which may be carried to the top of the mill during its rotation.

We find in practice that it is desirable to provide a convenient method of grading the consistency of the powder extracted from the mill and in order to do this we prefer to arrangethe extracting chamber in such a manner that the height ofV its inlet from the center of the mill can be adjusted. It will be obvious that` when the inlet to the chamber is arranged in the highest part Vof the mill only the ktinest dust will pass in through l Specification of Letters Patent.

Application led June 29, 1912.

form of a series of funnels.

Serial No. 706,662.

the inlet to the collecting chamber while when the inlet of said chamber is arranged in a position nearer the level of the material in the mill the eoarser dust will pass with the finest dust into said collecting chamber and from said chamber through the outlet under the influence of compressed air or the suction created by the fan or by any other means. l

We provide in the hollow trunnions or disk or disks at the end or ends of the mill a pipe forming a compressed air inlet provided with a series of jets adapted to direct compressed air upon the balls or pebbles during the rotation of themill in this manner preventing the powder from collecting on the surface of the pebbles and thus causing cushioned surfaces thereon which destroy their grinding efficiency. Y

Our invention is illustrated by way of example in the accompanying drawings in which- Figure l. shows a side View partly in section of the mill. Fig. 2. shows a seetion on the line A-B of Fig. 1. Fig. 3. shows an alternative form of our invention in which the extracting chamber is in the Fig. 4l. shows a detail sectional view of an alternative form of a portion of the device. Fig. 5. shows an end elevation of Fig'. 4.

' As` shown in Figs. l and 2 of the, drawings, wend it desirable to support the periphery of the mill l on a series of rollers 2 instead of on a central axis. With such an arrangement the central hollow trunnions can be dispensed with altogether and we may form the ends or part of the ends of the mill of stationary disks 3 of suitable material, said disks supportin the chute 17 and the air inlet tube 4 anc outlet conduit 5 for the powdered material ground in the mill above the center of the mill and consequently allowing of the mill being' loaded above its center of gravity and thus increasing its output. As shown in Figs. l and 2 we may arrange the extract: ing chamber in the form of a narrow box 6 arranged either at an angle as shown or in an upright or approximately uprlght position in the mill and extending throughout its length. The top of said chamber is open to receive the powder extracted in the mill and the outlet from said chamber leads to the outlet conduit 5 through the hollow trunnion. At a suitable height above the Patented Feb. 25, 1913.`

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Y pressed air upon the balls or pebbles 12 aty chamber 6 we larrange a hood 7 adapted to prevent the entrance of any large particlesl which may be carried to the upper part of the mill during its rotation. Wei-prefer to provide the box chamber with telescopic sections, such as 8, so that when desired the position of the top of said chamber with regard to the central axis of the mill can be adjusted in order that the consistency of the powder extracted can be graded conveniently. In order to allow of a convenient adjustment of the telescopic sections 8 of the chamber 6 and to insert the pebbles or balls we may arrangea manhole 9 in a convenient position on the periphery of said mill through which the said telescopic sections can be conveniently adjusted. The set screws 10 are provided by which the sections 8 of the chamber 6 can be locked in the desired position. The mill may, if desired be made in two parts (not shown) so that it can be easily taken to pieces and each end may be made removable. If compressed air is used by discharging the powder from the mill through the outlet conduit 5 we provide in the inlet pipe 4 a series of openings 11 adapted to direct a series o-f jets of comright angles to the general level of the material during the rotation of the mill, as shown by the arrows in Fig. 2, in this manner preventing the owder from collecting on the surface of said) pebbles and thus causing cushioned surfaces thereon which destroy their grinding efficiency. In the mills of this class in which compressed air has been used the air has been directed from a single jet at one end of the mill to sweep across the pebbles and to pass out at the other end of the mill. The material to be ground is fed into the mill through the chute 17 provided with a series of outlet passages 18 through which there is a constant feed to the mill during its rotation while any material remains in the chamber 17. The powder suspende-d in the-mill during its rotation passes under the :hood 7 into the chamber 6 and from thence to the outlet conduit 5, as shown, by the arrows in Figs. 1 and 2. Means may also be provided such as sliding valves, whereby the size oA the inlet passages 18 can be adjusted-s0 as to vary the volume of material fed tol the mill, according to the speed at which the mill is rotated and the nature of the material to be ground.

In the alternative form of our invention illustrated in Fig. 3, we arrange in the mill a central pipe 13 leading to the outlet conduit 5 and mount on said passage a series of funnels 14 with curved telescoping ends, conveniently turned alternately in opposite directions, as shown, the pipe 13 and branches 14 constituting the extraction chamber. The powder suspended in the air during. the rotation of the mill passes through the openings 15, 15a glas shown by the arrows) of said curved en s, while any large particles which may be carried to the top of the mill are prevented from Aentering by the arched top walls 16 which constitute the hood over the inlet openings.

In Figs. 4 and 5 we show another form of a detail portion of our invention in which we provide means whereby the inlet conduits to the mill and the outletconduit frrm the extracting chamber are supported by a stationary disk of convenient diameter arrangedin one endl of the mill, the other end of the mill being attached to and adapted to rotate with the periphery of the mill. The edge 20 of the circular opening formed in the rotating end of the mill which receives the stationary disk 21', is provided with an outwardly extending flange 22 on the internal surface of which is arranged a worm 23. The said disk 21 is provided with a corresponding outwardly extending flange 24. The said worm 23 isadapted to feed back into the mill any dust which may pass from said mill in to the joint formed by said surface 20 and the periphery of theV disk 21. We arrange a hollow ring 25 adapted to cover the outer end of the joint between said stationary disk 21 and the rotating end of the mill. Compressed air is led into said hollow ring 25 through a passage 26 and this compressed air acts in.-

addition to ,said worm 23 and returns to ,the mi'll any dust which may accumulate in the joint. The air pressure in the ring is higher than the pressure in the mill. In some cases we may nd it desirable to dispense with the worm 23 and rely upon compressed air alone to return the dust t0 the mill. The ring 25 is retained in position by a series of springs 27 arranged between the` cuter face of said ring and the inner faces of the arms 28 of a standard 29. It will be obvious instead of the arms 28 the upper part of the standard 29 may be in the form of a disk. AThe stationary disk 21 is conveniently attached to said standard 29 by means of the connecting rod 30. In this arrangement the extracting chamber 6 is supported `by said stationary disk 21 conveniently by its outlet conduit 32 which passes through said disk and forms a return pipe parallel with or approximately parallel with the inlet conduit 33 for the chute and' the inlet tube 34 leading compressed air into the mill to blow upon the pebbles or balls as previously described. In this arrangement of the mill we may open the chute or inlet conduit 33 for the material to be fed into the mill, to the source of compressed air thus enabling the use of compressed air for feeding the material from the chute into the mill. The arrangement of the inlet for compressed air in the chute is a usual and convenient one in mills of this class in which compressed air is used for separating the dust ground in the mill.

It is obvious that the extracting chamber shown in Figs. 1 and 2, or that` shown in Fig. 3, maybe substituted for lthe arrangement illustrated in Fig. 4. It is also to be understood that the extracting chamber shown in Fig. 4 may be provided with a hood and telescopic Walls in the same manner as illustrated in Fig. 2.

Although we have described as means for withdrawing the powder ground in the mill the use of compressed air or suction it must be understood that if desired we can arrange a mechanical feed beneath the chamber 6.

W'hat we claim is-- l. In a ball or pebble mill the combination of a mill chamber, an inlet conduit for the material to be ground, an internal extracting chamber having an upper inlet rpening, a hood covering said inlet opening to said extracting chamber, and adapted to prevent the entrance of any large particles which may be carried to the top of said extracting. chamber, said hood and the walls of said extracting chamber being relatively adjust-able, and an outlet yconduit leading from said extracting chamber for thel powder extracted. f

2. In a ball or pebble mill the combination of a mill chamber, an inlet conduit for the material to be ground, an internal extracting chamber having an inlet opening affording communication between said extracting chamber and the mill chamber, means for adjusting the walls of said chamber'to vary the position of said inlet opening in relation to the level of the material in said mill chamber, a hood covering said inlet opening to said extracting chamber adapted to prevent the entrance of any large particles which may be carried to the top of said extracting chamber, and an outlet conduit leading from said extracting chamber for the'powder extracted.

3. In a ball or pebble ymill the combination of a mill chamber, an inlet conduit for the material to be ground, an internal extracting chamber having telescoping walls provided with an inlet opening affording communication with said extracting chamber and the mill chamber, a hood covering said inlet opening to said extracting chalnber adapted to prevent the entrance of any large partia cles which may be carried tothe top of said 'said extracting .chamber for the pow rom said extracting chamber for inlet conduit having a series of openings in chamber, and an outlet'conduit leading from 4 said extracting chamber for the powder extracted.

5. In a ball or pebble mill the combination of a mill chamber, an inlet conduit for the material to be ground, a compressed air inlet pipe extending in parallel relation with said material inlet conduit having a series of openings in said pipe arranged at intervals across the mill chamber and adapted to direct compressed air upon the balls or pebbles at right angles to the general level of the material during the rotation of the mill, an internal extracting chamber having an inlet opening aii'ording communication between said eX- tracting chamber and the mill chamber, a

hood covering said inlet opening to said extracting chamber and adapted to prevent the entrance of any large particles which may be carried to the top of said extracting chamber, and anoutlet conduit leadin from er extracted.

6. In a ball or pebble mill the combination of a cylindrical millchamber mounted 011 a series of rollers, a stationary end to said mill chamber, an inlet conduit for the material to be ground mounted in said stationary end above the axis of rotation of the mill, an internal extracting chamber having an inlet opening affording communication between said extracting chamber and the mill chamber, and an outlet conduit leading from said extracting chamber for the powder extracted.

7. In a ball or pebble mill the combinatlon of a cylindrical mill chamber mounted en a series of rollers, a stationaryV end to said mill chamber, an inlet conduit for the material to be ground mounted in said stationary end above the axis of rotationof the-mill chamber, an internal extracting'chamber having an inlet opening affording communication between said extracting chamber and the mill chamber, means for adjustin the Walls of said chamber to.vary the position of said inlet opening in relation to the level of the .7.

material in said mill chamber, and an outlet conduit leading from said extracting chamber for the powder to be extracted.

8. In a ball or pebble mill the combination of a cylindricalmill chamber mounted on a series of rollers, a stationary end to said mill chamber, an inlet conduit for the material to be ground mounted in said stationary end above the axis of rotation of the mill chamber, an internal extracting chamber having telescoping walls and provided with an inlet opening affording communication between said extracting chamber and the mill chamber, a -hood covering said inlet opening to said extracting chamber and adapted to prevent the entrance of any large particles which may be carried to the to-p of said extracting chamber, and an outlet conduit leading from said extracting chamber for the powder extracted' mounted in said stathe material to be ground vmounted in said.'

stationary disk, an internal extracting chamber having an inlet opening aording communication between said extracting chamber and the mill chamber,` and an outlet conduit leading from saidv extracting chamber for the powder extracted. i Y 10. In a ball or pebble, mill the combination of a cylindrical mill chamber mounted on a series of rollers and having a flange surrounding a circular opening in the end wall ofthe mill chamber, 'a worm on the inner periphery of said flange surrounding .said circular opening, a stationary 'disk' mounted in said circular opening, an inlet jconduit for the material to lbe ground vmounted in'said stationary disk, an internal extracting chamber having an inlet opening affording communication between said extracting chamber and themill chamber,

i means for adjusting the walls of said chamsaid extractingchamber, and an outlet vcon-v duit ,leading from said extracting chamber opening to said extracting chamber adapted "to prevent the entrance of any large par-v ticles which maybe carried to the top of for the powderextracted mounted in said stationary disk.

11.y In a kan .or pebbie min are Combina-f tion of) a cylindrical' mill chamber mounted on a4 series of rollers and having a circular opening in the'end wall of the mill chamber, a` stationary disk mounted in said circular opening, means for creating a greater fluid pressure lthan the'luid pressure in the `mill chamber on the exterior surface of the .joint between said stationary disk Aand the rotating edge of -the end wall'of the mill rsurrounding said circularopening, an inlet conduit for the material to be ground ,mounted in said stationary disk, an internal.

extracting chamber .having an inlet openingaHording communicationv between said extracting chamber and the mill chamber, and an outlet conduit leading from said extract- 4 ing chamber for the powderextracted.

12.'Iii a ball or pebble mill the combina` tion ofa cylindrical mill chamber' mounted on a series of rollers and'p'rovided with a circular opening in the end wall of the mill, a stationary disk mountedin said circular opening, a hollow ring. adapted to cover the outer end ofthe joint between the stationary disk and the rotating end of the mill,

means for leading compressed air to said hollow ring, van inletconduit for the ma` terial to b e ground mounted in saidstationary disk, an internal extracting chamber.v

having an inlet opening affording communication between said extracting chamber and the mill chamber, means` for adjusting the walls of said extracting chamber to vary the position of -said inlet opening in relation .to

the level of the material in said mill chainber, and an outlet conduit leadingfrom said extracting chamber for the powder to be extracted.

-l3f In a ball or pebble mill the combinan.

tion of a cylindrical mill chamber mounted on a series of rollers and provided with a circular opening int-he end wall of the mill, a stationary disk mounted in said circular opening, a hollow ring adapted to cover the outer end of the joint between the stationary extracting chamber having 'telescoping walls and provided'vvith an inletopening affording communication between said extracting disk and -the rotating end of the mill, means chamber and the mill chamber, a hood covering said inlet opening to said extracting chamber and adapted to prevent the' entrance of any large ,particles which may be carried to the top o'f said extracting cham'- ber, and an outlet conduit leading from said lextracting chamber for the powder to be extracted mounted in said stationary disk. In testimony whereof we have signed our namestov thisrspeciication in the presence of two subscribing witnesses, d

' GEoRGEroU-Nrlnui Wm'iiii Horiz.

HAROLD -ll/'ILLIAlll JOSHUA CHEFFINS.

, Witnesses: i

LnoNAni E. HAYNES, CLARENCE' P. LIDDEN.

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