USRE14764E - Assicajobs - Google Patents

Description

J'. H. AND 1. MACARTNEY. CENTRIFUGAL AIIRI'IIUNAL PULVERIZEH. APPLICATION FILED AUG. I9, ISIS.

Reim-i Imc. 2, 1919. 14,764.

Z SIIEES SHEET Z.

vUmriin STATES PATENT OFFICE. 'A

l l i .IoHN- H. MACABTNEY ANI)l JACK MACAE'INEY, or Los ANGELES, CALIFORNIA, AssIGNoEs To II. T. aUnIsILL, TRUSTEE, or, Los ANGELES, CALIFORNIA.

CENTRIEGAL ATTRITIONAL PULVERIZER.

To all lwhom 'it may concern: Be it known that we, JHN H. MAGARI` NEY and JACK MACAR'INEY, both citizens of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Centrifugal Attritional Pulverizer, of which the following is a specification. This invention relates toa machine adapted to reduce to fineness such materials as ore, clay, quartz, silica, and the like.

Anobject of the invention is to provide a machine of this kind which willoperate at comparatively low speed with hi h efficiency toreduce to any re uired broken materials by a grin ing action of the pices of material upon each other with minimum wear upon the machine and with maximum range of product.

The invention relates to the construction of the grinding chamber formed by opposite recessed heads mounted face to face and relativelyl rotatable, and an object is to so construct the chamber that one or each of the heads impels in the direction of its rotation a portion of the passing material with minimum jamming of the material, lso that'fthe grinding is freely effected bv an attritiohwof the meetingr surfaces of the relatively moving bodies of material.

The invention is broadly new, basic primaryand pioneer, in that means are provided whereby broken stone or other loose material to be pulverized, which has been introduced into a chamber formed by the juxtaposed cavities between two. relatively revolvin ,containers is held yin place by thefcom and of means actingcounter to such force, That is to say: the centrifugal force is opposed by means prnctically normal or at right angles or abrupt relative to the rad-ius along w ich the centrifugal force acts, so that the main body of material within each .container revolves with its container in a practically firm and rigid mass thus forming' two grindstones or the like having adjacent relatively revolving'faces that Inutually actfattritionally upon each Ilother or upon interposed material to effecttpulverizama of the material at or about th'e medial [1G/DESS ing bodies having coactin ined action of centrifugal force,l

Specification of Beissued Letters Patent. Reissued Dec. 2, 1919.

Original No. 1,253,619, dated January 15, 191B, Serial No. 141,689, filed January 10,

reissue tiled August 19, 1918.

1917. Appunti@ for serial No. 250,586.

plane between,4 said containers which are separated at such plane to allow 'discharge of the pulverulent product. v

It is understood that;y heretofore ithas been proposed to grind or pulve'rize material by the action of two relatively revolving hol'- low containers upon thecontents of such containers; and this invention is distinguished from all such pulverizers in having means that act in a practical manner to directly intercept the radial or tangential. im-' pulse of the material caused by the centrifugal force so as to form two dlstinct grinding bodies that relatively' revolve, each with its own, and not with the other, container.; each of the containers being outwardly de-4 pended from the axis on which it is revolved, and having a depth of recess at the periphery of the recess which allows the loose material that is fed thereto, to

uch a depth against the exterior of the conning wall of the recess, that the body in each recess is given the rigid and practi cally solid character requisite for action as an independent grinder operating to ulverize material at or about the media or equatorial plane of the mass of material in the chamber formed by' theA two juxtaposed recesses.

It is understood that the best results are obtained byprovid'ing each container with an annular rim wall, the inside face of which is vertical to such equatorialv or medial plane. f

The principal object of the invention is to provide a' pulverizer in which the material to be grou-nd forms relatively rotatopposed grindf ing surfaces that grind eac other and fresh material, and are automatically and continuously renewed, as needed, by fresh material.

.A further object of the invention is to utilize centrifugal forces to maitain and renew said grinding surfaces.

The invention isy particularly new in that it utilizes a container which is so sha. ed that the material to be ground -is pacled therein -by lcentrifugal force, thus forming a grinding surface at which the grinding takes place. In the embodiment of the'invention disclosed herein, two such grindbank up to;

' ing members that although the machine are used, the grinding taking lace between these members which rotate in opposite directions.

Another feature of novelty resides in agradual drawing together of the top yand vbottom walls of the chamber near the pe= ripheral discharge which is provided throughV the medium of the space between the rims of the opposite 4recessed rotating heads.

An object of the invention is to provide a pulverizer that will operate with great efciency and without such )amming together of the two relatively rotating masses as would cause them to, so unite that there would be relative revolution between one or both of the containers and the contents.

An object is to cause relative grinding action between the centrifugally impelled and peripherally restrained masses without jamming or clogging in either wet or ydry proc esses of pulverizing.

A further object of the invention is to providea machine in which the wear on the machine is minimized and the pulverizing is effected by contact of relatively moving portions of the material to be pulverized and in which the 'material is-quickly'discharged when it reaches the fineness required' so is adapted to grind material to exceeding finenss for cyaniding and flotation processes of recovery,

i-t may also 'be reduced to'a nearly uniform mesh of any size. l

Other objects, 'advantages and featuresof novelty may appear drawings, the subjoined detailed description and the appended claims.

' grinding chamber The accompanying drawings illustrate the invention.

on a straight .vertical line, of av machine constructed in accordance with this invention. V 2 is a detached elevatioh, partly in section, of the hollow .centrally ported shaft detached. i

' Fig. 3 is an enlarged detailA of the opposing rims ofthe oppositely` concaved grinding heads.

Fig. 4 is a plan of said machine partly in section.

` Fig. 5 is a the case or housing detached. The hollow 'material holding members are Shop njas conca-ve heads 1 and 2 'that have opposite recessed faces 3 and 4 forming `the 4 are essentially panshaped, and are outwardly deepened from. near the center to near the and are mounted hollow faceto i periphery, hollow face and revolving, as desired, on the same axis in different directions, or in the same direction at different speeds, or one may be stationary While the other revolves.

from the accompanyingY Figure 1 is an elevation, partly in section,

. I peripheral wall againstwhieh fragmental side elevation of -X'ed upon the hollow shaft 'l' The heads 1 and 2,"

shaft is driven by means of a j thereto by alkey 12 engaged by screw 13. It 1s understood that 1n case the outwardly lby the lower revolving head, and they are thus measurably prevented from abrading the heads. the pieces partaking of the rotary motion while being subJectto the outward propulsion of centrifugal force and grinding upon each ot ier en masse at the periphery of the chamber.

That is to say, the chamber is pcripherally deep enough to cause an accumulation of the materialrwhich has taken on a rotary motion and become subject to centrifugal force;

and such material banks up on to the two peripheral walls that are relatively rotating and two revolving annular masses of broken material are thus formed, and the friction between such masses, respectively, and the peripheries ofthe rim walls which restrain such masses, respectively from dying out- ,wai-d, is in excess of the friction between the uniting faces of such masses. A principle .of the invention is that the rotating pans or Containers are sol shaped at the periphery thereof that the action of centrifugal force set up in the material bythe pans, is directly applied to produce such a friction between therevolving body and its container, that the body will invariably revolve with its container when the container is driven at theproper speed, and thus be transformed into a grinder opposed to the body of broken material contained'in the other container, and that agi'inding action will be set up and maintained at or about the plane at which the two bodies come into opposition.`

The lower head 1 has a removable finished rim, 5 and the upper head 2 has an apposite removable finished rim rims forms at the annular outlet a vertical the material will be held by erationV of the pulverizer. The head 1 'is by the key 1 in the key way 7', and the bore a of said shaft' 7 terminates within the chamber formedcby said heads and is arranged to admit material to said chamber through lateral ports.

'. Said shaft is mounted in the frame 8 by means of a atep bearing 9 and an upper bearing 10l connected to the frame. Said The head 2 is provided, with a hollow arbor 6. lilach of these centrifugal force in the oppulley 11 fixed 4, outside of a housing containing both heads in the form of balls 14 journaled by means .of the brasses or Babbitt bearings 15, 16 on the hollow shaft 7 and is rotated by means of pulley 17 fixed to said arbor 14. Said hollow arbor is supported by an antifriction thrust-bearing comprising a raceway 18 xedto the frame 8 and raceway 19 fixed by cap screws 20 to the hollow arbor 14 ang antifriction means 1 in said raceway. This bearing is arranged entirely outside of the head 2 and the hollow arbor, and also and constructed of an outer annular rim wall 22 having an inside annular defiector 23, and top and bottom annular plates 24, 25, secured to said wall 22 by screws 26, the upper plate 24 beingfixed by screws 27 to the raceway 18 and the lower plate 25 being fixed by any suitable vmeans as rivets 28 to a reinforcing ring 29 surrounding the downwardly extending hub 30 of the lower head 1. Means are provided vfor adjusting the lower head 1 toward and from the upper' head 2 and in the form shown the same' consists of threads 31 on the shaft 7 below the bottom plate 25 of the housing, and' adjusting or Set nuts 32, 33, on the threaded portion 31 to support the hub 30 which rests upon the upper set nut 33. By adjusting the nuts 32, 33, up or down, the annular peripheral discharge orifice 34 may be narrowed or widened. Said discharge orifice 34 extends as a narrow slit between the rims 5, 6 entirely around the rotor formed by heads 1, 2, and rims, and may be adjusted to a. minute width. l

The rims 5, 6 are xed to their respective heads by ca screws 35 extending through the outer e ges of the heads and screwed into the rims 5, 6. Packing held in place by means of a packing ring 37 and' cap screws 38 make a tight joint between the supporting shaft 7 and the lower head 1. A collar 39 is fixed by lcap screws 40 to a flanged collar 41 having its flange 42 rest* ing on the annular support 44 of the frame 8 and fixed thereto by cap screws 43. Said collar 39 extends inwardly beyond the in 'ner surface of the hollow surface 7 and is internally threaded to receive and support the feed tube that extends down through the hollow shaft 7 and terminates just below the lateral ports 46 thereof, which are located above the level of the lower face of the rim of the upper head 2, so that material fed into the tube 45 will be delivered to the grinding chamber above the level of the peripheral outlet 34 and will be of a diameter less thanthe depth of either ports 46 to the rim walls 5, 6.

`This arrangement of the port or inlet of the loose broken material relative to the outwardly depended containers establishes for the chamber an outwarfllyy deepened character whereby the material moves freely pan from said 4from the inlet to the revolving mass which is frictionally held by the container to which it becomes practically fixed by' the friction inducedby the action of centrifugal torce.

There is a lurality of the openings 46 so that material) livered to the grinding chamber from different sides of the rotating hollow shaft 7. The tube 45 revents the material fed into the machine rom coming into contact with the hollow shaft until it reaches the discharge outlets thereof. The shaft is formed with an outwardly sloping surface 47 at the may be simultaneously dey port 46 to allowithe material to readily pass outwardly through the opening 46. A hopper 48 is fixed by suitable means as rivets 49 to the top collar 39 so as to deliver the material to tube 45.

The housing wall 22 is fixed by bolts 50 to the frame 8 and is provided with a discharge outlet 51 opening downwardly through the lower plate 25 of said housing. The step bearing may be of any suitable material and is shown as rovided with pack-l ing or babbitt 52 and the antifriction plate 53.

The frame may be constructed with three legs `having base members 54, having flanges 55 provided 'with holes through which bolts or cap screws, not shown, may be in-l serted .to fasten the framesto theI floor. The legs 57 are Abent over inwardly at their u per ends and extend radially toward t e center in thel form of ltop beams 58 fixed by cap screws 59 to the lower raceway 18. The

upperportions of saidv legs are bent upward 58 to form legs 60 .of a stand screws 61 to the annular supl each other and thus direct the material toward the walls and inside of the rims 5, 6, and the friction of the material on the walls of the heads and rims is depended upon to cause each portion of the material to revolve with the head in which it is contained.

In practical operation, the pulleys and grinding heads may be driven in the direction indicated by the arrows thereon, the lower head l and pulley 11 rotating in the .one direction and the upper head 2 and pulley 17 rotating in the other direction.. The material being fed into the hopper descends through the ports 46 into the grinding chamber 4 formed by the concavities 3 and 4 with the result that the lmaterial, responsive to 'the impulses of the rotatingv shaft is received by the head 1 rotating 1n versely-revolving masses of material vof the heads the same direction, and travels outward filling the outer portion of the recess 3, and covering the bottom of the inner portion.'

Centrifugal force holds the material against the rim walls 5, 6 but the outer oblique edges a, b, of the concave inner faces ofthe heads converge towardthe vertical walls formed by rims 5, 6, so `that centrifugal force causes the material to be fed toward the medial spaces between.the heads to effect grinding without jamming or clog- Ags the material is fed into the chamber 4% such chamberJnay become entirely filled and in case the heads are reversely rotated the material in the independent recesses 3 and 4 respectiively will take on the opposite rotation l and 2 respectively, so that at or about the level of the discharge slit 34 there will be a division between the contents of the chamber, the material in the lower head revolving in the direction of-the arrows on said lower head and the upper pulley, and the material in the upper head revolving in the reverse direction as indicated by the arrows on the upper head and the lower pulley.

As, a result of this operation the reat the central plane near the rim walls 5, 6 one another and the air contained in the interstices of the mass is driven outward by centrifugal force and expelled through the peripheral discharge slit 34 carrying with it the fine particles which are also centr1fugally driven and immediately taken up by the air as they carried by Vthe air to the outlet 51 from whence they may be conducted by any suit-- able means to any suitable receptacle, not shown.

Whenever it is desired to gain access to the heads the upper cap screws 26 and the cap screws may be removed and the heus ing Wall 22 lowered. out of the way. Then the cap screws 35 may be withdrawn from the rims of the heads.

The rim members 5 and 6 may be made of very 'hard and substantial metal capable of resisting Wear and they may be replaced in case of wear by removing the cap screws 35, then slipping out the rims 5, 6 and replacing'them with new.

It is .obvious that belt-s or other driving means not shown may be 'arranged as desired and that the opposite recessed grinding heads 1 and 2 may be thereby rotated as desired, simultaneously in the same direction,

or either independently with the vother at rest and that the most rapid grinding will occur when the heads are oppositely rotated. A manhole 63 in the housing wall 22 and 'a removable manhole cover 64 provide access to the dust chamber 65 in the hofusing. In the wet processof pulverizing,}water grind become ground off and are.

will be fed into the hopper with the material to bepulverized and will be thrown out by centrifugal force, thus Washing out the reduced material.

We claim:

1. A pulverizer comprising two hollow` members arranged one above the other and forming a chamber and a peripheral outlet from said chamber, means to rota-te said members, and means to\supply material to the chamber between said members; said chamber increasing in depth outwardly from the supply means to near the periphery and the walls of the chamber being curved toward each other near the periphery.

2. A pulverizer comprising two hollow members forming a chamber and separated to. form between them a peripheral outlet from said chamber, means to rotate said members, and means to supply material to the chamber between said members; said chamber being outwardly depended and terv members forming a chamber and separated to form between them a peripheral outlet from said chamber, means to oppositely rotate said members, and means to supply ma terial to the chamber between said members; said chamber being outwardly deepened above and below the central horizontal plane to near the periphery and then gradually reduced in' depth to the periphery and terminated by vertical walls formed by the rims of the chamber to stop the outward How of the material above and below said central horizontal plane.

4. The combination with a frame, a step bearing and an upper bearing connected to the frame; of a shaft mounted in said bearings and having a bore in its upper portion and lateral ports at the vlower end ofisuch bore; a head fixed to the shaft and recessed on its upper face below the level of said ports; a head recessed on its under face and having a hollow arbor extending upward therefrom and journaled on said shaft; means connected with the hollow arbor to rotate the upperhead and means connected to the shaft to rotate the lower head; a top collar connected to the frame and a tube connected to said top collar and extending down within the bore of the shaft to allow material to lbe delivered therethrough to the ports without contact with the walls of the Ore.' i

5; A pulverizer comprising two hollow members arranged one opposite the other and forming a chamber v anda peripheral outlet from said chamber, means to rotate, p

i vabove an Yals be tinuousand vertical to the medial plane of said chamber, at .the peripheryr thereof.

6. A pulverizer comprising two hollow members forming a chamber and se arated to form between them a periphera 'outlet from said chamber, means to rotate said members, and means to .supply material to the chamber between said members; said lchamber being terminated peripherally by separated continuous vertical walls that operate to stop the material/on its outward course. l v

7. A pulverizer comprising two hollow members forming a chamber and se""arated to form between them a periphera V outlet from said chamber, tate said members, and means to supply material to thewchamber between said members; said chamber havingl continuous vertical walls formed by the rims of the chamthe outward flow of the material below a central horlzontal plane. 8. A pulverizer comprisin an upper ber to A,storia head; means for rotating said cad; a lower ead; means for rotating-said lower head.; each of said heads being panshaped and so placed as to coperate to form a grindin chamber; and a rim on the outer edge o each of said heads,said rims being so placed as to form a narrow continuous peripheral discharge slit there-between through which the pulverized material is discharged, the inner surface of each of said rims formln a peripheral wall substantially at right ang es to the direction of the centrifugal force exerted by the rotation of said heads so that the material to be ground will be held against said walls by said centrifugal force and rotated with said heads respectively thus forming grinding surfaces ofthe material to be ground between the main bodies of which the grinding action takes place.

9. Two opposed containers arranged to revolve about an axis and means for revolving said containers at the required speed or said containers so designed with a continuous peripheral wall, that material fed into the chamber formed between such containers will be carriedl to the interior phe of such chamber by centrifugal orce an thereby held at such periphery in a mass ormasses that will revolve with such containers, thus being formed into a crushing or grindin mass or masses that will by lng revolve at proper speeds cause such material to crush or grind itself.

10. Two opposed containers revolving in opposite directions and means for revolving said containers; the containers being constructed with continuous, relatively deep peripheral walls so designed that broken or oose material fed into t e chamber or cavity between suchl containers formed by them will be carried by centrifugal force to that portion of such chamber or cavity farthest` means to oppositely roi' and said bodies will revolve and be held thereby so as to constitute grinding or crushing masses that will be maintained in each of such containers by theaction of centrifugal force.

l1. A means for forming loose or broken material Ainto'grinding or crushing masses by subjecting such material to the action of centrifu al force within containers so designed tat Asuch loose or broken material is held practically integral with such containers by 'the actlon of centrifugalforce thus forming and holding such material into bodies constituting oo perating grinding or crushing masses; means .for bringin ortions of such masses of. material so he d into contact with each other for grinding or crushing purposes; means for allowing escape of such material when ground to the desired iineness, and means for renewing same. f

12. A pulverizer com tively rotating opposite tainers formin ceive between t be ground and adapted to set upcentrifugal from the ceniers upon which such containers force in such material, said containers havy ing:A rims that are spaced 'apart and that are su ciently abrupt and continuous to peripherally restrain the masses of material therein so as to form two masses that' are made rigid b centrifugal force acting upon pieces of bro en material to form grinders.

13. A pulverizer comprisin opposed rotating. containers each of whic is so shaped at the periphery thereof that the action'of centrifugal force only set up in the material by the container is directly applied to produce such a; friction between the revolving body and its container that the-body will invariably rotate with theA container when the container is drivenat the proper speed,

int grinders that coperate to grind materia 14. A ulv'erizer comprising rotary grinding heads havin opposite recessed faces forming a grin 1n chamber and having opposite rims space apart, thereby forming an annular outlet and `having continuous walls terminating at the outlet, and vertical to the plane of rotation; means for feeding material to the grinding chamber; means for rotating the heads' in opposite directions and means near the perip ery to force the material in the chamber toward the separating space.

lIn witness whereof, we have hereunto set our hands at Los 10th day of August, 1918.

JOHN H. MACARTNEY.

JACK MACARTNEY.

Witness:

Janna' R. TowNsltND; Y.

thus vbe transformed Angeles, California, .this f

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