US1245625A - Grinding-mill. - Google Patents

Description

J. B. SHACKEY;

GRINDING MILL.

APPUCATION FILED MAR. 23. x914.

Patented Nov. 6, 1917.

3 SHEETS-SHEET I.

IN V EN TOR. Jam; [5. Jfi/IC/(EK WITNESSES:

J. B. SHACKEY.

GRINDING MILL.

APELICATION FILED MAR. 23. 1914.

Patented Nov. 6, 1917.

3 SHEETSSHEET 2.

WITNESSES.- %K/ v J. B. SHACKEY.

GRINDING MILL.

APPLICATION FILED MAR. 23.19%

1,245,625. Patented Nov. 6, 1917.

3 SHEETSSHET 3.

5 INVENTOR- JAMES 13. SHACKEIHOF SAN FRANCISCO, CALIFORNIA.

- GRINDINGLMIILIL To allauhomz't may concern:

Be it knownflthatfl,'Jati sfB. SHACKEY, a citizen ofthe UnitedStates, residing at San Francisco, the jc'oiinty' of San I Francisco, State of Caliiorn'iai, have invented; a new and useful G rin ding Mill, of the following is a .sp'ecification in'such 1111 and clear 'termsfas' will? enable those skilled in the art to constructand'use "the same.

This invention relates" to a grinding mill of the Chiliantype in which'the grinding roller 'is rigidly restrained so ,tha'tf it win always advance with its axis radial tojthe driving shaft and atri'ght angles thereto,

while freet'o rise and fall over obstructions or;-1arge lumps ofore'to be'crushed.

Another object of-thefinvention is to producea mill in the entire weight of'the roller and axle thereof shallb e carried by the roller and in which the vertical driving shaft shallonly have the weight ofthefdriv ing head 'feedbox and "drive gear to support, thereby reducing the necessity for heavy step or' thrust bearings' such'as are often used where additional weight is sought to beplacedon the rollers by'the use of de vices to restrain the free'ao tion offthe same.

' less taken up and; nottrans mittedto the driving shaft, thereby preventing it from ;.track die to wear Another object of the invention is to provide means whereby the enormous vibration dueto crushing of the rock will'be more or becoming quickly crystallized.

A further object of'the invention is to provide means whereby the positionof the rollers may be easily adjusted radially so that one roller will be caused to travel on the outer portion of the track die, another 2 1 on an intermediateportion'and another on POrtiO'n? er y wm juing the equally on 1 1-p 'r pp r Surface. x f

A further object of the' invention is to provide means whereby the mercury used in the mill atall times will have clear passageways for its escape t the-Cleanup P An embodiment of the'inv'ention is shown in the drawing 'jin whichj the same reference numeral is applied to the'same portion throughout the several views, but I am aware that, there are many modifications thereof,

Figure 1 1s a vertical sectional view of one e th was; mill? Specification oiLetters P atent.

the screens, v I I a 'Fig'. 3 is a" plan View of the complete mill,

Pa-tented Nov.6,1915% 'Applieati o n 'filedMarch22 ,19l4. seriarmmej ia.

Fig. 2 is a side elevation of a portion of the discharge trough around the outside of a portion of theife'ed pan being broken away j for par os'estf illustration,

Fig; i is a plan view'of the central portion offth'e drive head, portions'ther'eof being broken away to enable'the central" thereof to be better illustrated,

' Fig.- 5 is a plan vie'v'vfof a portion of a t'rackdie and a portion of the seat upon 'wl' ich the track die rests, Fig 6 is a side elevation of a-portion of the track die andfa'portion ofthe' seat upon "-w'vhich 'saidjtrack die "rests,

Fig. 7 is a Vertical sectional view illus trating one roller of a mill of aslightly different i type from that shown in the preceding figure in which the entire Weight of the drive head and parts assembled} thereon is "supported by the floating roller aXles',-the

latter being urna-led in boxes slidable in guides in said drive head,

Fig.8 is a View in end elevation of one of the sli'dable axle boxes'and part's adjacent *the" same, and

Fig. 9 is a'plan view of the top of'the drive headand one ofthe axle boxes slidable the guides thereof.

This mill is installed upon a suite bie base j l, which base may be of concrete or wood as desrred Onan*'ad o1n1ng base 2Jthere" 1s a bearlng 3 forth'e drlve'shaft 4, said drive shaft" also having a bearing 5 on the base 6 wl iichis bolted to the vmill base 1. The base 6 has'a plain step bearing 7 for the support of the main've'rtical driving shaft 8. e

The mill comprises the grinding pan 9,

which. pan is cast in one piece and has a bearing 10 at the center connected with the outer portion'thereof bymeans of strengthening ribs 11. This pan has a corrugated track 12 upon which the track die'18 rests, said corrugations extending up the shoulder as indicated at let for the purpose of per mittin'g any mercury accumulating between the track die' and' the inner side of the pan to Work down into the corrugations under the track die and out in the outertrough 15 withinthe pan. The trough 15 extends entirely around the pan on the outside of the track die and is'inclined to two discharge passage ways 16 closed by means of plugs portion 7 V the drive axle heads may be adjusted and 17. Outside of the grinding pan there is a splash trough 18 which leads to the discharge spout 19 for delivering the pulp to a suitable discharge sluice way.

The outside casing of the mill is made up of a plurality of sections 20 secured together by means of bolts 21, suitable flanges being cast integral with the sides of the pan for that purpose. These sides are flared outwardly from the trough 15 and are con nected therewith by suitable bolts, not shown, to prevent the sides from being dislodged in the operation of the mill. Each of the side members 20 is provided with two lugs 23 and the pan 9 with one lug at for each section :20, said lugs being for the purpose of enabling the wedges 25 and 26 to clamp the screen frames 2? in place.

The upper casing of the mill is made in four parts 28 having suitable outturned flanges 29 and secured together by means of bolts 30. This cylindrical casing fits down into the casing formed by the plurality of side pieces 20 and prevents the splash from getting out of the mill except through the screens. In order to keep the splash through the screens from getting on the floor suitable splash plates 32 are provided to contact with the lug 38 for holding said plates in place.

The shaft 8 carries a driving head 10,

said head having horizontal flanges 11 which support the feed spouts L2 and the scraper arm 13. The scraper arm 13 is held in pos1- tion by means of the shim l 1i and set screw 45, and at its lower end it is provided with the scraper 46 which extends diagonally across the track die.

It will be observed that while the present mill is shown with three rollers that any number may be used so that while this mill is provided only with six of the vertical cheek-pieces 927 that any other mill would be provided with two cheek-pieces for each of the rollers used. In order to strengthen the cheek-pieces corner webs a8 and 49 are cast integral with the cheek pieces and the horizontal webs 41. Each cheekpiece has a wide groove therein to receive the rollers 50, 51, 2. 2 and 53, said rollers being pivotally supported in the drive axle head 51, two at the top and two at the bottom. Each of the rollers is grooved to receive a Jlurality of balls 55, which balls bear against hardened wear plates 56 and 57 at the sides of the rollers.

It is contemplated that the position of this adjustment is eflected by the removal or insertion of thinner or thicker shims 58, 59, 60 and 61. The object of this adjustment is to enable the rollers 62, 63 and 6% to be so adjusted as to evenly wear the track die. It will be observed that the roller 62,

J for example, is in substantially the center of the track die, while the roller 64- touches the outer edge and the roller 63 touches the inner edge of the track die, note Fig. 3.

Inserted in the guide way of the drive head between each of the shims is a strip of leather or other suitable material as indicated at 65, 66 and 67, the object being to provide a resilient backing for said wearing shims, thus reducing the amount of vibration transmitted from the driving axle to the drive head and the driving shafts. The drive axle 68 extends at right angles to the axle head 5% and where the axle head comes in contact with the sides of the cheek pieces said head is provided with bearing rollers 69, said rollers being inserted in pockets in the sides of said axle head.

The driving axle has a suitable flange 70 thereon and at its outer end it is provided with a nut 71 for retaining the roller in place. The bore of the roller is babbitted or lined as indicated at 72 to afiford a hearing and the end of said bearing is flanged outwardly as indicated at 73 to afi'ord a bearing for the wear plates 74 between the nut 71 and the end of the bearing after the roller is assembled upon the drive axle 68 and has the nut 71 secured in place. The nut 71 is a split nut and is locked in place after being screwed up by means of the screw 75, whereupon the cover 76 is secured in place by means of the bolts 77, said cover being for the purpose of preventing mud and pulp having access to the axle bearing. In order to prevent water and pulp from running down on to the axle bearing the roller has a deep annular groove 78. In order to prevent grease from getting out of the driving axle and into the pulp being pulverized and thereby interfering with the amalgamation, each roller is provided with a flange 79 and the driving axle head carries a bracket 80 which supports a small trough 81, the upper end. of which extends under the flange 79 and the lower end of which discharges on the top of the grinding pan, a flange 82 preventing the grease and oil from getting into the grinding mill, while the pipe 83 permits it to drain to a suitable place of discharge.

In order to admit the lubricating fluid to the driving axle, said axle is bored as indicated at 81 and has connecting bores 85 and 86, with the latter of which the pipe 87 connects, said pipe being held in place by means of the bracket 88, which bracket is supported by the driving axle head. The pipe 87 has a union 90 which connects it with a flexible pipe 91, said pipe in turn being connected with a short nipple 92 with which the oil cups 94 are connected.

The oil cups are supported in a central chamber of the feed pan 95, said feed pan being bolted to the top of the driving head as indicated at 96. It will be observed that necessary for the ,drivinghead to have three channels 97 as indicated in Fig. 1,. which figure also lllustrates the centralropenmg 98 through which the oil feed; pipe 99 leading fromthe. feed cup 1-00 extends, said oil pipe delivering oil into the channel :101 from .which itruns behind the key 102. down to,

the mainshaft' bearing 103. J

It will also be observed that :Fig. illustrates the threeopen-ings 101 by which the feed pan is secured tothe driving head. The feed pan has a projecting throat for each of the feed chutes 12 as indicated at 105. oil cups are covered over by means of the cover 106 to prevent thepulp from being discharged thereinto and to prevent the pulp from filling up the chamber in which said oil cups are placed.

The shaft 8 is provided with a large bevel gear 107 having its teeth facing downwardly and in mesh with the bevel pinion 108 on the shaft 1. In order to lubricate the bearing 7 a pipe 109 is provided, said pipehaving the oil cup 110 connected therewith.

The grinding pan is suitably bolted or otherwise secured to the base upon which it rests.

In the form of the invention shown in.

Fig. 7 only aportion of the mill is illustrated, the base and driving parts being substantially the same as that shown in thefirst form of the invention. In this modified form the grinding pan is shown at 120, the track die at 121 and the main drive shaft at 122. This drive shaft carries slidable thereon the driving head 123, said head being suitably keyed to the shaft by means of two keys 121 and 125. The driving head is substantially the same as the driving head shown in the first form of the invention, except that it projects radially slightly more as indicated at 126 and has a cross bar 127 connecting the cheek pieces 12S and 129, said cheek pieces being faced with hardened shims 130 and 131.

Movable in the drive head are the two half boxes 132 and 133, said boxes forming the bearing for the shaft 134: to rotate in. This shaft has flanges 135 and 136 to take up the outward thrust caused by the movement of the wheel around its vertical axis. The two half boxes are suitably connected together by means of bolts 137 and each box at its side has two rollers as indicated at 139 and 140. Each half box has an upwardly projecting arm 11-2 and a downwardly projecting arm 143 for the purpose of carrying the rollers 14A and 115, of which there is one of each for each of said arms. Each of the rollers has integral therewith a trunnion 117 and 14:8 which extends through the arms integral with the half journal boxes and said trunnions are bored The.

to receivea pin shown in dotted linesat 1 19, Fig.9, each rolleri trunnion thereby re- :ceiving some support from ,the adjacent .rollertrunnion. V I a j Theguide way in each cheek piece is provided withresilientjbearing strips 150 and 151, said bearing strips having shims 152 and 153 placedthereoverto receive-the-wear due to the movement of the; rollers. Each roller isprovided with a plurality of balls let into the same asindicatedat 153, which balls ,bearnpon a shim 15 1, each guide way being provided with precisely similar shims and bearing strips.

Supported from the half journal boxes 132 and 133 by means of straps156 and 157 is an inclinel trough 15$,said troughbeing for the purpose of depositing any-oil which may run out of the bearing boxes within'the ring 159 on the pan 120, thereby enabling said oil to reach the discharge pipe 160 without getting into the ore to lee-crushed,

The roller 161 is held in place on the shaft 1.34 by means of the. nut 162, saidnut having a' bolt 163 to lock it ina given-ad=.

roller, which isordinarily made ofcast iron,

is a hard iron or steel tire 166.

Thedrive head is supported by means of a pair of springs 167 over each of the roller axles. These springs bear upon the underside of the transverse bar 127 and at their lower ends they rest upon a transverse bar 168, two bolts 169 preventing said springs from being dislodged and holding the bar 168 in place.

Connected with the half box 132 is an oil pipe 170 which pipe is in turn connected by means of a flexible pipe 171 with the bottom of the feed pan 172 above which the oil cups are installed, precisely the same as in the previous form of the invention. Extending through the bottom of the feed pan is an oil pipe 173 to feed oil to the central opening 174 in the shaft 122 and thereby lead the oil back of the key 125 to the bearing 174:.

It will be noted in this form of the invention that the entire weight of the drive head is carried by the driving axles, thereby affording that much additional weight to effect the crushing of the ore, while at the same time should any one of the rollers wear faster than the other it can move downwardly with respect to the driving head as much as may be necessary, while at the same time if it strikes an unbreakable obstruction such as a hammer it will be free to ride up over the same without unduly disturbing the other parts of the mill. It is also to be noted that if desired the split boxes might be used with the fixed drive head, or that the form of journal boxes'for the rollers shown in Fig. 1 might be used with the form of the invention disclosed in Fig. 7, the precise ournaling of the crushing roller being but a minor part of the invention.

Having thus described my invention what I claim as new and desire to secure by Letters Patent of the United States, is as follows, modifications Within the scope of the claims being expressly reserved 1. In a grinding mill, a pan, a track die therein, a shaft extending through the pan substantially at right angles thereto, a spider having a plurality of guideways on said shaft, a roll shaft for each guideway, a roll on said shaft and in contact with the track die, a head connected with the shaft, anti-friction rollers at the side of said head above and below the shaft, shims in the guide Ways and in contact with the antifriction rollers to regulate the position of the rollers with respect to the track die, and friction rollers on axes parallel to the roll shaft against which the guides bear to drive the rollers.

2. In a grinding mill, a pan, a track die therein, a shaft extending therethrough, a spider having a plurality of cheek pieces forming guideways supported by the shaft, a roll shaft for each guideway, a roll on each shaft, and in contact with the track die, a guide head connected with the shaft, said head having pairs of rollers at the top and bottom for directing its vertical movement, and other rollers movable on axes parallel to the shaft and bearing upon the cheek pieces of the spider guideways for driving the rolls.

3. In a grinding mill, a pan, a track die therein, a shaft extending through the pan, a spider having vertical cheek pieces forming guidways slidable on the shaft, heads slidable vertically in the guideways, a pair of rollers at the top and bottom of said heads and bearing on said guideways, roll shafts extending radially from the heads, rolls on said shafts bearing upon the track die, rollers on axes parallel to the roll shaft axis, and in contact with the cheek pieces of the spider for driving the rolls, and o springs for supporting the driving spider from the roll shafts.

In testimony whereof I have hereunto set my hand this 17th day of March, A. D. 1914, in the presence of the two subscribed Witnesses.

JAMES B. SHACKEY. WVitnesses:

CARLOS P. GRIFFIN, L. H. ANDERSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.

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