US1479141A - Mill - Google Patents

Description

H. L. KENT MILL s samstag-smet 1' Filed Aug. 12, 1921 'VTIJIILIIII Jan. l 1924 H.l L. KEN-r MILL Filed Aug. 12. 1921 3 Sheets-Sheet 2 Suva/nto@ *emi fa/"adel,

H. l.. KENT MILL s sheets-sheet a Filed Aug. 12. 1921 Patented nlan. 1, 1924.

ill TAS hdilelll HORACE L. KENT, OF NEW YORK, N. Y.

MILL.

Application led August 12, 1921. Serial No. 491,687.

To all whom t may concern.'

Be it known that I, HORACE L. KENT, a citizen of the United States of America, residing at New York city, county of Kings, New York, have invented a new and useful Mill, of which the following is a specification.

My invention relates particularly to mills for crushing stone and other materials. The main object is to increase the efficiency and capacity of the mill.

The invention is more particularly directed to mills of that type having a rotating ring and a series of crushing rolls.

The details of the improvement will be understood from the following specification and claims. Y

Figure l is a vertical projection and partial section of a mill embodying one form of the improvements of my invention;

Fig. 2 is an end view and partial section of the same; l v

Fig. 3 is a fragmentary sectional view;

Fig. et is a vertical sectional view of a modification; and

Fig. 5 is a fragmentary sectional view of a modification.

In the form shown in Figs. 1, 2 and 3 the ring 10 is freely rotatable and has a groove which receives one or more crushing rolls. In the case herein shown there are four rolls 11, 12, 13 and 14. The shape of the rolls and the groove in the ring co-operate to crush the material between them. Each of the rolls is mounted on a shaft eX- tending transversely through the ring, such as the shafts 15 and 16. Each shaft is supported ina bearing carried by a member, such as 17, which is adapted to -slide radially in a sleeve 18. Each of the shafts is pressed outwardly by means of a spring, Such as 19, sothat all of the crushing rollers are yieldingly pressedV into the-groove or track in the ring.' One of the shafts may be driven by suitable means so that its rollers will frictionally drive the ring, and theA ring in turn will drive the other rollers.

The ring and rollers are enclosed in a suitable housing 20, which is provided at one or more sides with a hopper or chute 21, through which the material to be crushed is fed. The b'ot tom of the chute is subjected to the abrasivev action of the material being ground, and with Some materials the bottom Wears very rapidly. I have provided a removable bottom section 21', which maybe removed when worn and replaced by a new section. The lower end of the bottom section preferably has a downwardly-extending portion which is substantially flush with the inside of the housing, and the wear will be taken by the bottom and not by the housing. To facilitate the delivery of material to the groove or track in the ring 10 between the rollers, I preferably provide an inclined flange 22, which extends up close to the edges of the rollers. I also provide the ring l0 with flanges 23, which extend laterally beyond the edges of the rollers and inwardly toward the aXis of the ring. rlhese iianges 23 serve not only to increase the initial capacity ofthe ring, butthey serve to retain the material in the ring for a much longer time than is possible with a ring whose width is no greater than the width of the roller. Material whichl passes between the rollers and the ring is crushed or broken and, due to centrifugal force, tends to fly outwardly. The mass being ground will consist of coarse and fine particles. The larger particles during the rotation will work to the bottom of the ring and be crushed between the ring and rolls, while the finer particles in the mass will work upwardly or toward the edge of the ring and, during the operation of the mill, will be forced along the flanges 23 and over the edge thereof. rlhe flanges 23 serve to retain the material until `the rproper degree of lineness is attained. In the form shown a substantially annular space is provided at each sidev of the ring for the discharge of the crushed material.

lt will be noted in Figs. 1 and 3 that lthe flanges 22 and 23 overlap, that is, the flange 22 extends inside of the flange 23 'of the ring. It is therefore practically impossible for material `which is being fed into the mill through the chute 21 to fall through without being acted upon by the crushing rollers.

ln the present instance four rollers are shown in a ring, and each of two rollers are mounted diametrically opposite each other. The strains are thus more nearly equalized than if,`say, three equidistantly spaced rollers were provided. With the form shown,

when a large piece of material gets between the ring and one roller, the spring on the opposite roller is Stressed, while, if three (lll rollers were provided, the springs on the two rollers' opposite would be 'stressed andnparts of the mill might be broken.

Although the apparatus thus far described embodies improvements inthe art which may be used by themselves, I have illustrated those improvements in connec-` tion with what may be termed a duplex unit, which has advantagesof its'ow'n.`r` In' the duplex unit construction I provide each shaft with two sets of ',rollers, "one set of which co-acts with theriiligld and the other'set of 4which co-acts with the rings l0". i The beartwo sets of rollers and' rings to operate more or 'less'. independently of" each other...v By mounting vtwomro'llers on'elach shaft, the crushing strains are more evenly distributed as eachl roller is 'somewhat controlledfby the action of the" other froller, and' neitheriroll can search out''ir'idi'vidualv soft spotsinits ring and hammerflat surfacesin' the ring, as sometimes occurs in single unit constructions. y y' 'y By using four rollers with eaeh'ring, itis possible to locate the' inlet chutewbetween two rollers withan'obtuse angle, thereby reducing the tendency of the fed-in material to flow ver th'e sides ofthe ring. VVi't-h 'a steep inlet angle there is less wear on the walls ofthe chute'. l l

In Fig. 4 Ihave illustratedcertain features of the inventionV as applied toa modilied form of construction. In vthis case the ring 30 is carried by a web 3l secured 'to the shaft 32, lwhich is `driven lby` suitable'ineans. Therollers 33 engage'within the vring and are adaptedto be driven thereby. The housing and ring are'provided `with overlapping Iflanges 34k and in a maiiiiersiinilar to that previously described. The web" or partition 31""is likewise preferablyV provided l'with flangescorrespondin'g to the"flangesv 34. I have also illustrated. thisV construction "ast applied tov a' 'dupleXjQ mill-with a second-ring 30 and1 corresponding co-operating:rollers: *In

erves as a partition be- Fig; 5 'sfllustratedfafmpdifed form" of ring* 'and rollerf The. ring in" this--.aform '".is provided with side flanges 36, the edges of which are turned inwardly toward the transverse plane. ofwthe roller, as a`t`37. The inturned edges serve to retain the material in the ring better than a plain flange. In order to provide ample rfree space for the passage of material to a point between the ring and roller, the latter may be recessed, ifdesired, as at 38.

l. In a crushing mill, a grooved ring, a plurality of rollersmengaging" within said ring,`a housing enclosing said ring and rollers, .said having continuous flanges extending therearound yat"opposiite sides;4 and said housing having substantially continuous annular-flanges, :the flanges on 'said housing oyerlapping Vand extending within and being spaced'from the flanges on saidring whereby material Vfedy intio "the housing is prevented from falling outside ofthe ring, there being formed ya `narrow annular space for `discharge of crushed materiall over fthe outer edgeslof the'ilange'son tliering between the spaced apart annular flanges on the housing 2. Ina crushing'mill, a housing, a plurality of crushing rollers, an annular 'ringsurrounding said rollers and cooperating therewith to crush material, said ring'being of greatery width thant'saidrollers,and a substantially continuous annular flange onpsaid housingx projecting inwardly beyond', and overlapping the edgeo'f said 'fring and in close 'proximityf'tfhereto' :whereby material fed into said ring will be 'prei'fente'dl fromV falling outsidethe' ring; there being 'a' narrow annular space vfor dischargee'of crushed material overltlie edge ofl thev ring between the'annular flange on the housing and the edge of said ringLf y' 3. In acrushingmill, a housing, a plurality of'roller's, a groved ring surrounding said rollers and'adapted'to cooperate therewithk for grinding material, said ring being ofl greater width' than said rollers, and an annular'"fla1ige"carried by said housing at each 'side ofsaid ring and projecting'l inwardly beyond' the kedges thereof to a point slightly i removed' therefromY whereby material fed into said ring' will be prevented from'falling outside the ring, there being an annular space for jdischarge o f'crushed inateri'al'ove'r theedges of 'thering between the annular flanges uand the edges of thel ring.

4. In 'av crushingmill, a plurality of sets of crushing? rollers, a' corresponding pluralityv yof rings surrounding' said rollers and adapted toro-operate therewith for crushing material,*an annular partition between said ring'sfandlflanges projecting from said partition-f fr ffdeilecting' 'material fed into said rings away t#froirrthe` edges thereof and betweenthe rings and crushing rollers. f `l`fif'tn afcrishing-mill,'aplnrality of sets 'of crushing rollers, a corresponding plurality of rings surrounding said rollers and adapted to (zo-operate therewith for crushing material, a housing for said rings and rollers, a partition between said rings, said partition and said housing having flanges thereon projecting inwardly toward said rings for deleeting material fed into the rings to points between the rings and crushing rollers.

6. In a crushing mill, a plurality of crushing rollers, a ring surrounding said rollers and co-operating therewith for crushingy material, said ring having a continuous flange thereon with its free edge directed inwardly toward the transverse plane of said rollers, and means for rotating said plural# ity1 of rollers and ring relatively to each ot er.

HORACE L. KENT.

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