US814961A - Pulverizing-mill. - Google Patents

Description

PATENTED MAR. 13', 1906. E. H. HURRY. PULVERIZING MILL. A PPLIOATION FILED 13160.13, 1898- 4 SHIRTS-SHEET 1.

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E, H. H R Y} PULVERIZING MILL. APPLIUATION FILED 13, 1898.

PATENTED MAR. 13

4 SHEETS-SHEET 2.

M arui ATTORNEKX 'PATENTED MAR. 13, 1906. E. H. HURRY.

No. 814,961. v

PULVERIZING MILL.

APPLICATION FILED DEC. 13, 1898.

4 SHEETS-SHEET lNVENTOfi W/TNESSES PAIENTED MAR. 18, 1906;

' E. H. HURRY. PULVBRIZING MILL.

APPLICATION FILED DEO.13, 1898.

4 8HEET8-SHEET 4:

- U TED; STATES PATE oninon.

Ta aZz whom it may-concern: V v Be it known that I, EDWARD H.'HURRY, a subject of the Queen of Great Britain, residing at Bethlehem, count of Northarn ton,- State of Pennsylvania,

tainnew and useful Improvements in Grinding". or Pulverizing Mills, of which the follow in is a specification.

he invention relates to that class of mills Iofin' which one or more. rolls capable of radial movement relative to the center of the machine revolve upon'their axes and about "the axis of and incontact with thefir'mer surface I of a grinding-tin Its object 1s to increase the efficiency 0 such mills,- im roveand simplify their construction,- re uce wear,

make the, working parts more accessible for re air or replacement, to provide for proper lubrication-, and to prevent the access of dust or rit to the bearings. v In mills of this gen era class'the axes-of the'revolvin rollsare sometimes at an angle to a vertica line., In

' some cases the ower applied to-th'e machine. revolves the roil and shaft-about the axis of the; 'nding-ring, and the roll is caused-to revels), upon its own axis by frictional contact with-the ring, while in other cases the ap lied power revolvesthe roll about its axis an the orbital travel 40f the-roll, or. that. about the axis of the rin ,is produced b frictional contact between t e ring and rol In some mills the 'rolls'revolve upon their shafts, while in others their shafts revolve, and generally, the rollsare so hung, su ported, or carried that when in operatlpn t ey are imelled against the ring b centrifugal force. y im rovements, as wil be obvious from the'folibwing description, are applicable'to the various styles of this general class of grinding-mills. 1

The accompanying drawin s show an em- ;bodiment of my mvention'w ch experience- .has demonstrated to-be practical and efficient.

. Obviousl however, those skilled in the art may rea 'l vary the construction without departing om the principles of my invention. I

The following detailed description 'is specifically addr'essedto the construct1on 1ll us- ,trated and words of'reference or description fpf parts therein are not to be. taken'as'limitk ing the scope of the invention or confining the form ii -which it may beembod ed- In the drawings, Fi re 1 1s a vertical-cen- .tr a l- 'section;Fi 2',- a p an view, partly broken away at one e;-Fig. 3, a detail vertical secspecification of Letters Patent. Application filed December 13, 1898. Serial No. 699,182-

ave invente :cer-

Patented M nnie, 19cc.

tion at right angles to the section of Fig. 1, showing t the pivoted head in which it is mounted; Fig. 4, a vertical section through a machine ofmodified construction Fig. 5, a detailvere upper end of the roll-shaft and ticalsection on the same plane as Fig: 1 through a roll and the parts carrying or supporting it, .showi v Fig. '6, a detailv ew. of a modified way of mounting or suspending the roll-shaft; Fig. 7, a sectional view illustrating a construction in which the grinding-roll is positively revolved aboutits axis by the power applied to the machine; and'Fig. 8 is a detailsectional view at right angles to the section of Fig. 7, showing t e upper end of the roll-shaft and the arts connected therewith.

' T e chu'te-on- 'eceptacle A at'the bottom of the machine for the reception of the reduced a modified construction;

material is mounted upon any suitable base. Over the receptacle and secured thereto in any suitable way is a heavy ring B,'that' supports or has made in one piece with it a pan C, which forms the chamber to hold the material to be reduced. The ring is 1 formed with two external horizontal flanges. extending from its upper and lower 'edgesand which may be connected by strengthening Webs or braces, which webs appear in Fig. 4 square in plan and may be secured to the base by bolts B Around the inner circumferehce of the ring is arranged a grinding-ring D, seated u on an offset or shoulder in the ring B and eld by one or .more bolts (1 or, otherwise. The interior face of the'grindingring'is an upwardly-flaring one-that is to say,

the diameter of its opening at its lower edge is less than the diameter at the upper edge.

Upon and concentric with the ring B and secured thereto bybolts b is seated a cylindrical casing E, that may be of cast-iron and have outwardly-extending flanges at top and bottom connected by vertical webs a. An inwardly-projecting flange E is formed at the bottom of the casing, restsupon the ring B, and has therein apertures e, that coincide with apertures b in the ring opening into the chute or receptacle A. Near the upper end of the casing is another inwardly-projecting flange 'E, The two fla es-E E have on their irmer faces shoulders that form seats for nds E E, suitably secured therein and to which are attached the screen or wire-cloth of suitable mesh. At one side'the casing is' formed with an enlarged opening closed by a removable -cover F and provided with a arms are flanged and bolted to the upper flange of the casing. The space Within the spider-arms forms a chamber in which a beltpulley H works. The spider is formed with a hub G, in which, a Vertical pendent shaft G Fig. 1, is mounted, being supported by a split ring or plate 9, engaging an annular groove in the up er end of the shaft. The

. hub may be radia ly slotted, as shown in Fig.

2, and pinching-bolts employed to contract the'hub to cause it to firmly clamp the shaft. The pulley runs on this shaft and is supported by a collar g fitted to the lower end of the shaft. On the bottom of the pulley is bolted a closed cap 9 covering the end of the shaft, and a packing-washer g is inter osed between the upper end of the pulley-hu and the hub of the s ider. An annular oil-chamher 9 is forme within the pulley-hub near its upper end and has one or more passages extending to the upper face 01 the hub. The

' washer g and the entire bearing of the pulley may therefore be kept supplied with oil, while there is no opportunity for dust or grit to enter the bearing. The bottom H of the pulley may be solid except as hereinafter mentioned and at its lower edge has a down- 'wardly-projec'ting flange h, that runs in an annular gutter or trough formed in a flange at the upper edge of the casing E. The trough may be filled with oil or suitable liquid, and it and the flange h should be of suitable depth. In. this Way the escape of dust or grit between'the edges of the casing and pulley is prevented.

The pulley H has two parallel webs H H,

extending from its hub to its rim, forming a chamber communicating with the interior of the casing through an opening in theunder face or side of 'the pulley. A pendent block or head I has trunnions i, Fig. 3, turning in pillow-blocks or bearings in or on the upper edges of the Webs H and also on each side at one or more points below the trunnions (two being shown) sockets for the reception of cheek pieces or strips '5 of suitable metal, that work against corresponding cheek pieces or strips '5 secured in sockets in the sides of the webs H to reduce friction and torsional strain on the trunnions 6,. provided to adjust the strips The head or block I is bored out to receive the end of a shaft K, which is supported therein by a nut K on its end. The shaft extends down into the grinding-chamber and carries at its end the grinding-roll L, mounted to move longithe pan some kind M, against which the shoe or cast- Set-screws i are tudinally on the shaft. This roll has a bushed hub Z, formed integrally with the body of the roll and closed at its lower end, where it is provided with a bearing washer or disk Z" to take the friction of the thrust against the end of the shaft, and also a separately-formed grinding rim L, held in place on the body, of the roll by a shoe or casting L applied at the bottom of the roll-bod and secured by bolts, as snown. A sleeve 1 attached toa collar L bolted to the open end of the roll-hub, surrounds.the shaft and extends up into the chamber within the pulley in which the shaft is mounted, where its end is closed by a disk Z through which the shaft passes, suitable packing necessary, to guard against the admission of dust or grit to the roll-bearing. This sleeve may be provided with an oil-cup 1 so that the bearing may be flushed with oil. When the mill is not in operation, the roll will slip down on the shaft, but should not descend so far as to pass out of engagement or contact With the grinding-ring. I prefer, therefore, to lace centrally on the bottom of 8 an annular track or support of ing on the bottom of the roll bears. In the construction illustrated the roller-shaft is vertical when the machine is in operation and the periphery of the roll is tapered to correspond with and conform to the angle of flare of the grinding-ring. As is apparent, the suspended shaft is hun so that it and the roll can swing radially wit reference to the axial line of the machine toward and from the grinding-ring. When power is applied and the ulley H rotated, the roll is of course rotated bodily around the axis of the rinding-ring and the centrifugal force deve oped tends to carry the roll away from such axis and against the grinding-ring. The friction of the roll against the rin due to this orbital movement induces the r0 1 to revolve about its axis, and the forces exerted and reaction between the flaring face of the grinding-ring and tapered roll cause the roll to rise on its shaft into the position shown in Fig 1. As stated, the material to be acted upon,'introduced at F, descends into the pan, while the reduced material resulting from the grinding operation passes through the screen F into being employed, it

the chamber or space between the screen and roll upon its shaft and the bearings of the driving pulley are completely protected the pu 3o ried by the bed plat'e through the 7 60 be sustained b I roll, thus reducing friction and incidentally against the admission of dust or grit, and the 1 only assage through which dust 'might pass (the eed-ho per F being of course normally covered) is fire openi'ng 1n the bottom of the ,5 pulley .c'ommumcatin with the chamber therein, in which the p1voted head or block I, supporting the roll-shaft, is mounted. To guard against the entrance of dust into this chamber, a vane or inclined hood N is placed 10 ,over it, Figs. 1 and 3, and closed against the walls of the chamber on all sides except that facing the direction ofrotation. -When' the pulley is rotated, a draft'of air is induced which lpasses down through the chamber in e and then e out into the receptacle A. To assist this action I place u on the sleeve L and within the openin'gin t e under face of the pulley one or more inclined blades or vanes As the operation of the mill ceases the roll will descend by gravityluntil the-shoe or casting on its bottom rests upon. the annular track on the bottom of the pan, the shaft-head I being then swung inwardly, the shaft correspondingly deflected toward the axis of the machine, and the roll still in contact with thegrinding-ring and resting a ainst it by force of gravity; Then the Wei ht of the roll and the parts rigidly connecte therewith is caan When the pulley is revolved, t e roll ri ses,'as already stated, into proper and efficient cooperative position with the grindin -ri'ng and'the strain of its tendency to furt er rise is then exerted against the end of its shaft.

This upward strain on. the shaftsubstantially, approximatel or beneficially neutral izes the greater Weig t on the side of the pulley supporting the shaft, and thus reduces the 0 total weight then carried by the;pulley,and

where but one roll is emplo ed correspondingly eliminates the unequal ateralstrain on the pulley-bearing thatwould otherwise exist because of theiunsymmetrical disposition of the weight about its axis. The forces. ex-

erted to lift the'roll may be varied by changing the flare of the ndin -ring and the corresponding taper o the r0 1, the eneral rule being that the greater the angle 0 flare of the 5 ring the greater the tendency for the roll to rise. When the mill is imoperation the roll rises under'the influence of. the centrifu gal force developed and the reaction between the grinding ring and roll and, incidentally, because of the pressure a ainst the periphery of the roll of the materia being ground, the roll will carry the weight of its shaft and in the construction Fi 1 the weight of the driver. The weight of al of'the revolving parts w ll.

the step-bearing Z in; the

f a plying the wei ht so 'icarried toreinorce t e pressure of t e roll a ainstthe track. The same is true inart 0 the construction 6 5 shown in Figs; 7 an 8,where the roll carries and into the interior of the casing the weightofthe roll-shaft that may, ass

into contact with the horizontal-Web o the pulley. In the operation of the mill when the forces which tend to sustain the roll in its I upper position are decre'a'sedas', for instance, bythe roll. striking a hard lump of material and rebounding therefromth ere will be. a tendency for the roll to descend; butdn the further operation of the mill it would rise again to.1ts normalcooperative relation to the grinding-ring. It is believed that the mill so operates and that there are advantages incident to such operation resulting in more perfectgrmding or pulverizing of the material. n the construction of Fig. 1 theresistanee of the shaft and driver to the up-- ward thrust of the roll constitutes a means for limiting the upward movement of the roll,

whereas the downward movement of the roll is arrested by the pan or by an appropriate sto1p,=as M; n mills of this type, but having acylindrical roll and die, the centrifugal force of the roll-sleeve actin horizontally outward and at a point consi erably above the die tends 'to tilt the roll and sleeve in such a manner that if unresisted the top ofthe sleeve would move outwardly, the roll itself rocking at the point of contact of its periphery with the die when theoutward sleeve-thrust exceeds the holding-down thrustof the roll, both act-. ing .on given arms. This tendency is resisted by the roll-shaft, which is revented from tilting in the direction. descri ed by reason of 7 its trunmon attachment to the drivin -head.

peringro'l acts on the latter normally to the me of contact ofthesetwo parts.that is to say, in a direction inclined upwardly from the horizontal. The vertical component of this reaction overcomes the combined weight of ther'oll and its sleeve; but as this weight acts downwardly along the axis of the roll, whereas the above vertical-component acts upwardly at the periphery of the roll, where it is in contact with the die, a turmn moment is impressed upon the roll ands eeve,

which turning moment is ina direction opposite to the turning moment roduced by .the' .centrifu al fnrce of the r0 1- sleeve acting above t e top plane of the die By properlyproportioning the several parts and the speed of operation of the machine the ob jectionable thrust of the ioll-sleeve a ainst' its shaft may be entirely eliminated and the resultant of the centrifugal force of the sleeve and the Weight of sleeve and roll combined delivered directly to the roll-track, together -with the direct outward thrust due to the resisted by the trunnioncentrifugal force of the taper portion of the roll-body. A further advantage of the construction is that a crushing pressure is produced between the roll and the die materially in excess of the centrifugal force of the roll. When the machine is in operation, the roll tends to move outwardly and upwardly along the flaring face of the die. ThlS tendency is in which cannot move upward, the result eirig that the roll and its shaft act as a wedge pushed between the trunnion-pin and the die, with the effect stated. i

N In Fig. 4 the construction is the same as that already described, except the shaft Gr extends through the grinding-chamber and has a bearing or seat 1 on the bottom of'the panC. The u per end of the shaft is clamped in the slotte hub 'of the s ider-frame by pinchin -bolts 2, and the pullhy is supported by a spit collar 3, ap lied to the shaft. In this construction the caring of the pulley is protected from dust and grit by an oil or fluid seal. A flanged ring 4, surrounding the collar and shaft, is bolted to the under side of the pulley andhas formed at its lower edge two downwardly-extending parallel annular flanges 3 5. A ring 6, formed with an annular trou h or gutter, is secured to thegjsh'aft, and in t e trough, which may be filled with oil, the innerflange 5 runs.

Some features of my invention may of course be used without the others. Thus in Fig. 5 I have illustrated an ordinaryconstruction'of roll and grinding-track wherein the grinding-faces of theseparts are vertical.

Here the roll is sup orted by an enlargement 7 on the end of t e shaft. Otherwise the construction of the mill is or may be such as I have above described.

e In Fig. 6 the roll-shaft'is slotted at its upper end. A bolt 8, suitably mounted or secured in the 'pulley or driver, may pass through the slot. roll may be mounted on the shaft, as in Fig. 5, or otherwise, so as to have no longitudinal motion thereon, and the roll in rising lifts the shaft with it. The pin or bolt 8 may be so related to the slot that when the roll and shaft are in their lower position the end of the slot will not come against the bolt, and the weight of the shaft or roll may be carried by the track or support in the pan, as already described. Similarly when the roll is in its highest position when the machine is'running at full speed the opposite end of the slot may not come against the bolt. Such bolt, therefore, need not bear the weight of the shaft and roll nor receive its upward thrust, but may serve merely as a guide.

But one roll has been illustrated. The use In such a construction the.

lurality of rolls is, however, common, and Fmay of course use more than one roll without other change in construction or otherwise affecting theoperation of the mill.

Fig. 7 shows a construction wherein the roll is driven ositively about its axis. My invention is a so applicable to machines of this eneral type irrespective of the special detai s shown. In the form illustrated the driving-pulley H, revolving upon the shaft G is closed at the bottom by a separatelyformed disk 10, free to revolve upon the shaft independentl of the pulley. A gear 11, keyed to the ub of the pulley within its rim, meshes with a pinion 12, keyed to the upper end of the roll-shaft which has its bearin and may slide endwise in a sleeve 13, capab e of rocking upon the horizontal bearings 14 14, carried in lugs 15, rising from the disk 10, closing the lower face of the pulley. Otherwise the construction may be the same as shown in Fig. 1. In Fig. 7.the vane or hood N is dispensed with; but the vanes ,L are reduce a current 0 tained and are placed upon the shaft within the opening in the disk 10, through which it passes. When the machine is in operation, these vanes tend to draw air through the joint between the tpulley and the disk and inair downwardly through the opening in the disk. In the drawings the roll and its shaft are indicated as in active position. The ulle as it rotates revolves the shaft, and t e r0 1 thereon being in contact with the grindin -rin an orbital motion about the ring is in uce ,which is assisted more or less by the frictional contact between the hub .and rim of the ulley and the hub and flange of the disk 10. hen the machine is idle, the roll may descend and rest upon a track or support in the pan 0, as already' described. The width and depth of the teeth of the gear 11 and pinion 12 are such as to permit this vertical and incidental an ular movement of the shaft.

n the mill illustrated as embodying this invention the roll-shaft is mounted directly in the driver between its hub and peri hery, to which the driving power is direct y applied, and thus no power is transmitted through keyed connections, which are very liable to work loose when subjected to the V1- bration caused by the grinding operation. Ex erience has shown this to be an efficient an advantageous way of applying the driving power to the roll-shaft, as in these machines the revolving parts are of considerable weight and speed of rotation is high.

I claim as my invention 1. A centrifugal grinding-mill, comprising the combination of a horizontally-arranged grinding-ring having an upwardly and outwardly flaring grinding-face, a downwardlyextending'roll-shaft, a driver above the ring with which the roll-shaft is connected, and a roll with a downwardly-tapering periphery,

- connected with the'rolI-shaft and traveling having a downwardly-tapering peri hery and around the ring. a t

2. In a centrifugal 'ndingwmill, the combination of a pan for t e reception of the material to be ulverized, a horizontallyarranged grin 1n -ring having an upwardly and outwardly aring grinding-face, a downwardly extending radially 4 movable roll-. shaft, a driver above the rib with which the roll-shaft is connected, an a roll with a downwardly-tapering periphery, connected with the roll-shaft and traveling around the ring clear of thebottom of the pan.

3. In a centrifugal grindin -mill, the combination with an upwardlyaring grindingring, of a wnwardly-projecting, radiallymovable ro' l-shaft, a-drlver above the rin with which the roll-shaft is connected, a rol I mounted revolubly on t e -ro *sha t, and an upwardly-extending sleeve attached to the roll. 7

I 4. In a centrifugal g-mill, a horizontally-arranged: grmding ri g having an upwardly and outwardly flaring face, and a rotating grinding-roll with a downwardly-tapering periphery traveling around the ring, whereby the reaction between the ring and roll and the centrifugal force developed, when the mill is in operation, impart to the roll "a tendency to rise relatively to the ring,

in combination with a driver located above. the ring, a downwardly extendin'g shaft connected with the driver and free to swing radially and traveling bodily around the axis of the ring, and a connection between the roll and shaft which permits-the roll to drop,

when the mill is not'in operation,out of normal operative relation to the rin and which limits the upward movement of t 'e rol1.,-

5. In a centrifugal grinding-mill, the combination of a horizontally-arranged grindingring having an upwardly and outwardl flaring face, a rotating grin ing-roll with a own wardly-ta'pering periphery traveling around the ring and free to movefwithin limits, 1ongi-tudinally of its axis and which descends,

when-the mill is at rest, out of normal operative relation to the ring, and, whenthe mill is in operation, is caused to rise b tlffri zreaction I between the ring and roll and t e centfifu a1 force developed, and a stop for limitingt e downward-movement of the roll. 1

6. r1 a cent rifugal grinding-mill, a horizontally-arranged grinding-ring having an up wardly and outwardly aring face, a rotating o ed when the 7mill is in operation impart to t e roll a tendency to rise. I

7. In a centrifugal 'nd1ng-m1ll,-a horizonwardly and outwardly aring face, a rotating driver located above the ring, a downwardlyextending' substantiallywertical but 'radlally- 1 swinging roll shaft operatively connected with the driver, and a roll associated with the ery and capable 'of free movement, wi limits, longitudinally of its axls, whereby scends out of complete cpgfierative relation to the ring and when the lie in operat on with by reason of the reaction between the ring and roll and oped.

8. stationary grinding-ring, anda' central V61? tral bore for the reception of the shaft, and a chamber located between its periphery and hub, a roll-shaft pivoted ,at its upper end in said chamber, and. a grinding-roll on the lower end of the shaft. t

9. In a grinding-mill, the combination of a driving-head adaptedto have power applied, to its periphery, and formed with a chamber having parallel opposite walls, a roll-shaft head movably supported in said chamber, and wearing strips orplates interposed between the head and the walls of the chamber.

In testimony whereof I have hereunto subscribed my name. T I EDWARD H. HURRY.

Witnesses: I

EDWARD C. Dxvrosom t O. D. LApLEY. a

shaft, having a downwardly-tapering periplh- V the centrifugal force devel-' In a centrifugal grinding-mill'having a" tical shaft, the combination of a rotative driver adapted to have the driving power applied directly to its periphery, having a cen driver located above the ring, a downwardlyring and roll and the centrifugal force devel tally-arranged grmdmg-ring having an upwhen the mill is not in operation the roll derises into complete cooperative relation there:

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