US1173625A - Feed mechanism for mixing-mills. - Google Patents

Description

P. E. WELTON.

FEED MECHANISM FOR MIXING MILLS.

APPLICATION FILED NOV. 4, 1914.

Patented Feb. 29, 1916.

3 SHEETS SHEET I.

P. E. WELTON.

FEED MECHANISM FOR MIXING MILLS.

APPLICATION FILED NOV. 4, i914- 3 SHEETS SHEET 2.

Patented Feb. 29, 1916.

2 NW 6 D P. E. WELTON.

FEED MECHANISM FOR MIXING MILIs.

APPLICATION FILED NOV. 4,1914.

1,173,625. Patented Feb. 29, 1916.

3 SHEETS*-SHEET 3.

'4 la d/1 111111 gw g 92M 5 my My WM Z 0 52% Z7 M fiATPIiZQ PATENT n TQHI, 1E" iSUYAfk-FGA FALL E UYAHOGA uxtim of Letter P imam 3 5nd thence i1 up over roll 16. The roll 16 is rotatively mounted in brackets 14 located adjacent to opposite sides of the pan 12 near the rear end thereof, which brackets are preferably secured to two movable rods 47 to be presently described. The roll 22 is rotatively mounted in brackets 21. These are located near opposite sides of the front end of the pan, and loosely embrace the two rods 47 so as to be capable of sliding thereon. Each bracket is, however, under the influence bf a spring which embraces the associated rod 47,said spring being compressed between said brackets and a collar on said rod. The ends of the roll 28 are rather loosely mounted in bearing brackets 27, each of which is rigid with a cylinder 26.

Each cylinder is slidably mounted on a rod 25, whose lower end is rigidly fixed to and is therefore, in effect, a part of a lever 23. The two levers 23 are independently pivoted on opposite sides of the pan,or rather to bearing brackets 13 rigidly secured to opposite sides of the pan. The two rods 25 extend upward from said levers, and at an angle toward the mixing roll 10, so that, when the device is in use, the upper ends of said rods will overhang the front part of the mixing roll 10.

A piston 29 is rigidly connected with each rod 25 within the associated cylinder. Each rod 25 has through it a duct 25, which, at its upper end, discharges into the cylinder 26 above the piston. At its lower end each duct is connected with a supply pipe 45, from which compressed air or steam may be discharged into duct 25, and thence into the cylinder. The result will be to yieldingly move said cylinder up on its supporting rod 25 as far as is necessary to keep the adjacent part of the feed apron 30 tigh The upward movement of each cylinder upon its supporting rod may be limited by its engagement with an adjustable nut 32 which may be screwed up and down upon the threaded end of the rod 25 by means of a hand wheel 32 The pull applied to the apron by the stated movements of the associated cylinders upward on the supporting rod will draw the feed apron tightly against the mixing roll 10, and will cause the supporting levers 25-23 to swing on their pivots toward the mixing roll 10. Now, when the apparatus is in use, and lumps of the mixture get between the'apron and the mixing roll tending to tighten the apron near one or the other edge thereof, the corresponding cylinder 26 will yield downward, the corresponding-lever 25-23 may swing slightly away from the mixing roll, and thereby this part of the belt will be so loosened to facilitate the passage of the lump without injury to. the apron. The opposite edges ofthe apron, adjacent to the mixing roll, will travel at different rates when lumps of material are unequally dis tributed thereon, and between the apron and feed roll, and therefore the apron will tend to move laterally, if this tendency is not overcome. The mechanism contains several 7 features, each of which alone does much to prevent this lateral movement, and all cooperate to practically prevent any lateral movement of said apron. Perhaps the most important expedient for producing this result is the clamping of the apron from side to side between a roll 37, and the roll 22, the latter being, as stated, under the influ ence of two springs 60 acting to yieldingly press it toward roll 37. When the moving apron is so clamped between the two revolv ing rolls 37 and 22, all parts of the apron. as it asses between these rolls, will be compelle to move at the same rate. There will be a slight puckering of one side or of the other side of the down running leg of the feed apron, between the rolls 28 and 37, but that is a matter of no importance. Said apron has preferablya rib 30 along its under side adjacent to each edge, as shown in Fig. 4. The parts of the apron rolls 1 22 and 28, neartheir ends, beneath this rib are of reduced diameter (as at 28) to at commodate this rib. A little roller 45 carried by each cylinder 26 engages each ribbe g5 edge of the apron and holds it down behind the shoulder 28 forn'ted by reducing the diameter of roll 28.

In order to further insure that when an extra large lump of material passes between we the apron and mixing roll nothing will be broken, the endwise movable rods 1? are provided on opposite sides of the pan. Each is slidably mounted in bearing brackets 48 fixed to the pan; and brackets ll. in 05 which the rolls 16, 17 and 18 are mounted, are secured to these rods. lVhen therefore :there is an extra large lump of material between the apron and mixing roll, and there by a severe strain on the apron. at one side ll; or the other this strain or pull will be trans mitted through the apron to the roll 16, and thence to one or the other of said rods 47, which will thereby be pulled fOl'Wlllll. in opposition to the spring 60 thereon. as beii fore explained. Not only will this syn-ing resist this movement. and will return the rod to its normal position when the strain on the apron is relieved: but as the spring .is additionally compressed it will push the no bearing brackets 21 forward and cause tlr roll to clamp the apron between it and the roll 37 with greater pressure and thereby to a greater degree oppose the tendency of the apron to move laterally. It is ale however, that when one of the rorh. moved as stated the other shall more in like manner. Therefore at th rear end of the machine a rock shaft 7*) is mounted in bearings fixed to the apron Two arms 71 are 130 fixed to it, and are respectively located near the rear ends of the rods l7. Pins 47* fixed to these rods go into slots 72 in the arms 71. This mechanism causes bot-h rods to move equally in the same "direction.

In addition to the feedapron 30 there is an auxiliary feed apron 10 which runs over and embraces the two r'oflls 17 and 3'7 before referred to, and athird roll'18 adjacent to roll 17 near the rear. ofthe pain-said rolls being placed so that the upper leg of the apron 4:0 will be held in contact-with the lower leg of the apron 30, and will extend slightly beyond both ends. As shown, the two rolls 1? and lB are mounted in the same brackets lei which support the roll 16; and roll 17 is located above roll 16 so that the apron 40 is held against that part of apron 30 whichis passing up around roll 16. A scraper maybe secured tothe brackets 14 in front of roll 1'7, and extended over apron 30 between-it and apron 40, so as to be able to scrape. from this latter any matcrial which might otherwise adhere thereto. Sometimes soine of the rubber inay be car' ried' up by the apron. Sometimes the powdered chemical which is being mixed with the rubber will be carried up by the apron over roll 28. In either event the tcrial so carried over will go with the apron, or willvfall by gravity into the projecting front end of the auxiliary apron This material will then go along ith apron 4lO,-and between itandthe apron 30- It will thereby 'be prevented from dropping off into-the pan. The scraper 80 will insure that this compound shall again be can ried around by apron 30 and op-in contact with roll 10.

Two levers '33, are pivoted to opposite sides of the pan, at points which are. approximately concentric with the roll 22,- they extend forward therefrom. The roll 37 extends between and is rotatably mounted at its ends in these two levers 33. The front ends of these levers are connected respectively with the two cylinders 26 b3 means'of the rods 34/ In the construction shown. a box 4-3 swi eled on a ho' izontal axis to the front end ol each lever 33. The lower end of each rod. pisses through a boxed and is held therein against 'endwise movement. l \";l'.\\{i nuts 34. The mi -per end of each rod Ii l passes tl rough a box which is swirelml on a horizontal axis to the associated orlim'ler and a nnt 36 on said rod li'miis tw downward moveme Q of These nuts in... 'I'lllXll thrush-1n agar e nnxin; ilrz'ral'trr. n all of the conditions or use. that is to 5. whe either i moving slightly u;

down. or

and

loosened, certain flexible flanges 77 will sag into vertical or nearly vertical positions, and any coniponnd'thereon will fall upon the apron. These flexible flanges 77 are, or may be secured to opposite sides ofthe pan, and extend inward over the sides of the apron, and normally rest attheir inner edges on said feed apron 30. They will catch any of the compound which falls from between the mixing rolls and wnich otherwise might not land on the apron.

Having described my invention, I claim:

1. In combination with the mixing ro'lls of-a mixing mill of an endless feed apron. three rolls over which said apron rnns,two of said rolls being located in planes below" the mixing rolls, two arms whiclrare pivoted at their lower ends and which, when in operative positions. extend therefrom upward adjacent to one of the mixing rolls, a member mounted on each' of said arms andslidable up and down thereon, there being an inclosed space between a part of each'arman'dsaid sl'idable member thereon, and means for de.

livering an elastic-pressure fiuid' into-said each of said arms being provided-with a piston, a cylinder shdably mounted upon each PlStOl'l and carrying bearings for the ends of the third apron roll, and means for delirering an elastic pressure fluid nnder press ire into each cylinder above the piston combination with the mixing rolls ng mill. an endless feet. apron there- H er which said apron runs being located in planes be mixing rolls. two arms piroterl oi: lower ends rand extending npw; alone f 0. mix

will. under all conditions of p third apron roll, each of said arms having a longitudinal duct which at its up er end communicates with the space wit in the cylinder and above the piston, and feed pipes in communication with the lower endsof said ducts.

l. In'combination with the mixing rolls of a mixing mill, an endless feed apron therefor, three rolls over which said apron'runs,- two of said rolls being located in planes below the mixin rolls,two arms pivoted at their. lower ends and extending upward adjacent to one of the mixing rolls, bearing brackets carried by said two arms',.the third apron roll being extended between and mounted in said bearing brackets, an auxiliary endless apron, and, rolls over which saidapron' runs, said rolls being so located that the up er leg of said supplemental apron is he d in contact with the lower face of the lower leg of the feed apron.

5. In combination with the mixing rolls of a mixing mill, an endless feed apron therefor, three rolls over which said apron runs, two of said rolls being located in planes below the mixing rolls, two arms pivoted at their lower ends and extending upward alongside of one of the mixing rolls, bearing brackets carried by said,- two arms,-the third apron roll being extended between and mounted in said bearing brackets, an auxiliary endless-feed apron located below the feed apron first'mentioned with its up e'r leg in contact with the lower leg of the rst mentioned apron, and extended at both ends beyond the lower leg of said first mentioned feed apron, and rolls over which said auxiliary apron runs.

6. In combination with the mixing rolls of a-mixing mill, an endless feed apron therefor, three rolls over which said apron runs. two of said rolls being located in planes be low the mixing rolls, two arms pivoted at their lower ends and extending upward alongside of one of the mixing rolls, hearing brackets carried by said two arms, the third apron roll being extended between and mounted in said bearing brackets, an auxiliary endless feed apron located below the feed apron first mentioned with its upper leg in contact with the lower leg of the first mentioned apron and extended at both ends beyond the lower leg of said first mentioned' feed apron, rolls over which said auxiliary apron runs, and a scraper which extends over the upper leg of the auxiliary feed apron.

7. In combination with the mixing rolls of a mixing mill, an endless feed apron therefor, three rolls over which said apron runs, one of said rolls when in working position being in a position which slightly overhangs one of the mixing rolls and the other two rollsbeing located in planes below the mixing rolls, a pressure roll'palallel with ward at an angle toward one of the mixing rolls, the third apron roll being mounted in the upper ends of said rods, and a roll mounted on an axis which is adjacent and parallel to one of the first two mentioned apron rolls, and means for relatively mov ing one of said two adjacent rolls toward the other to clamp said aprons from side Y toside between said ;rolls.

9. In combination with the mixing rolls of amixing mill, an endless feed apron therefor, three rolls overfivvhich said apron runs, two of said rolls being located in planes below themixing' roll, two arms piv' oted at their lower ends and extending upward alongside of one of the mixing rolls, bearing brackets carried by said two arms, the third apron. roll being extended be tween and mounted in said bearing brackets, two movable bearing br ickets in which that one of the-lower apron rolls is mounted which is nearest to the upper apron roll,

a pressure roll' parallel with and adjacent to,the last mentioned lower apron roll, and springs acting on the-bearing brackets of said apron roll'to yieldingly move them toward said pressure roll to causethe apron to be clamped between the said two rolls.

10. In combination with the mixing rolls of a mixing mill, an .endless feed apron therefor, three rolls over which said apron runs, two of said rolls being located in, planes below said mixing lrolls, two arms pivoted at their lower ends and extending therefrom upward alongside of one of the mixing rolls, members slidably mounted upon said pivoted arms and carrying bearing brackets'in which the third apron roll is mounted, means yieldingly impelling said slidable members to move up on said-rods,

an auxiliary apron, rolls over which said auxiliary apron, runs, which rolls are so located that the upper leg of'the auxiliary apron is held in contact with the lower face of the lower leg of the feed apron, two pivoted levers between which one of the rollers for the auxiliary apron extends, and in which it is mounted, and connections be tween said levers and the slidable members on the pivoted rods.

11. In combination with the mixing rolls of a mixing mill, an endless feed apron, three rolls over .avhich said-apron runs, two of said rolls being located in planes below the mixing roll, bearing brackets in which said lower rolls are mounted, endo movahle horizontal bars to which the warms? brackets of one roll are fixed,

li'gfh acting on said bars to yieldingly retheir movement in the apron loosening iiertion, two pivoted arms whichexteud iron; their pivotal support upward alonguitlt of one of the mixing rolls, a member Jidai tv mounted on each of said arms and rarrving hrackets in which the third roll is mounted, and means for vieltlingly pressing said members upward on their supporting arr 1 and means compelling both bars to more s il'nultaneously and equally in the HBITIC direction.

153, The combination with the mixing rolls of a mixing mill, an endless feed apron tl'ieret'or, three rolls over which said apron runs. two of said rolls heing located in planes below said mixing rolls, two arms pivoted at their lower ends and extending th retroni upward adjacent. to one ofthe mixing rolls. members slidahly mounted upon mild pivoted arms and carrying hearii'iejs in which the third apron roll is mounti means jvieldingly impelling said slidahle nwmhers to move upward on said rods, an inxiliaiw apron, rolls over whirh said a uxil iar apron runs. which rolls are so located that the upper leg ot the auxiliary apron is i 2: in 'eoiuact with the lower leg of the feed apron, two pivoted le ers hetween whi h one of the rollstor the auxiliary apron rxttnds and in which it is rotatul lfl mounted. and connections: hetween said vers and. the slidahle :nenihers on the pix oted rods.

1 In combination with the mixing rolls of a mixing mill, an endless feed apron therefor. three rolls over which said apron runs, two of said rolls being located in planes below the mixing roll, two arms piv oted at their lower ends and extending thereivom upward adjacent to one of the mixing rolls. memhers slidahly mounted upon said pivoted arms carrying hearings in which the third apron roll is mountethnieans yieldingl impelling said slidahlo memhers to moviupward on said rods, slidaiile hearing Markets tor that one of the two lower apron roll which is nearest the upper apron roll. prings acting on said hearing brackets to iazove them in the hell: tightening direction, an auxiliary apron. rolls: over which said uxiliary apron runs, which rolls are so lorated tll;.., the upper leg of the auxiliary apron is held in contact with the lower leg of the feed apron, two pivoted levers in which ono ol' the auxiliary apron rolls is roialahlv mounted in such relation substantially as shown to the adjacent movable roll of the main feed apron that said apron may he clamped hetween said rolls. and connection hetweeu said le 'ers and the slidahle TEHFUlIPlS on the pivoted rods.

it. In combination with the mixing rolls of a mixing mill, an endles teed agnoiz, three roll. over whita i pivoted arms which three rolls over whieh two pivoted arms Wllhil i-xn m n nevotal SIIIPPOI't upward at mixing rolls. a member i each of said arms and can which one of said three few. ed, two horizontal Clint itae ino ziiiie cated below the mixing rolls. two healing brackets respectively secured to said bars in which hearing brackets one of said three api on ro is mounted, two brackets slidahle in paths paral el w l aid liars. n brat lode the third an on Fall is a; prings ting to mm a the last Evfi: tinned l: ring hracltrts in UNP tliht 5 tn harr in the reverse direction and nirane i'oinpeliing both lane to more hunt tancousrv and equally in the same direction. it in combination ith the mixing rolls of a mixing mill. of an endless feed apron, tin:- e rolls over which said apron runs.--two of said rolls oi ing located. in planes la'low the mixing rolls. two arms hich are pis oted at their tower ends and which, when in operative positions. extend therefrom upward l ide of one of the mixing rolls.-each aid arms having a piston lixed to it near upper eirl. an extension member in the form of a i-vhader which embraces Faiil piston and i. i lahly mounted thereon, means for deliiering' an. elastic pressure fluid into the spam in mid cylinder ahove said iston. the third apron roll he ng extended lwtam-n and mounted in hearings rairied l 'v said two extension meinimrs, and means to! limit ing the upward moveu'ient or said extension members.

17. In comh iation with the mixing r lls of a mixing miil. an endless feed apron therefor, three rolls over which the. feed apron runs, two of said rolls being located in'planes below the mixing roll, two arms pivoted at their lower ends and extending therefrom upward alongside one of th o l;- ing rolls, bearings carried by said two piv- Med arms,--the third apron roll being extended b ween and. mounted in said bearand flexible flanges which extend over i of: the upper horizontal leg of the "iiili'flillltllll for mixing mills em- ,ipport adapted to be secured to E undwnmlli the milling rolls thereof,

' W said support, shelves over the side edges of Ming means for the or mixing mills emdapted to be secured milling rolls there- 5 by said frame. shelves m5; over the side edges of the apron. and. controlling means for the apron,

20. The combinalimi with the milling rolls at a mixing mill, of spaced rollers below a roller above said spaced rollie 1' u Hid rol mounted to slide toward and away from fjopies of said spaced rollers, an endless apron trained over said rollers, shelves above said spaced rollers extending over the side edges of said apron, and means for yieldably holding the slidably mounted roller at its upper limit of movement.

21. An attachment for mixing mills embodying a support adapted to be secured to a mill underneath the milling rolls thereof, spaced rollers carried by the support, a roller carried above and mounted to slide toward and away from the support, an apron trained over said rollers, shelves above and extending over the side edges of the apron, and means for yieldably holding the slidably mounted roller at its upper limit of movement.

In testimony whereof, I hereunto affix my signature in the presence of two witnesses.

PARK E. WELTON. Witnesses THEo. V. BUsK, CHAS. H. WELLS.

this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C.

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