US2457632A - Belt driven roller mill with adjustably and yieldably mounted roller - Google Patents

Description

Dec. 23, 1948.

W. P. BLAKE BELT DRIVEN ROLLER MILL WITH ADJUSTABLY AND YIELDABLY MOUNTED ROLLER 3 Sheets-Sheet 1 Filed June 25, 1946 ATTORNEYS Dec. 28, 1948. w. P. BLAKE 2,457,632

BELT DRIVEN ROLLER MILL WITH ADJUSTABLY AND YIELDABLY MOUNTED ROLLER Filed June 25, 1946 3 Sheets-Sheet 2 I 87 I 1 N 87m! 67 1 5'7 -/I9 I Io INVENTOR W/LL/AM f? BAA/(5 ATTORNEYS W. P. BLAKE BELT DRIVEN ROLLER MILL WITH ADJUSTABLY Dec. 28, 1948.

AND YIELDABLY MOUNTED ROLLER Filed June 25, 1946 5 Sheets-Sheet 5 I I ATTORNEYS Patented Dec. 28, 1948 BELT DRIVEN ROLLER MILL WITH ADJUST- ABLY AND YIELDABLY MOUNTED ROLLER William P. Blake, Fairmont, 0kla., assignor to K & B Manufacturing 00., Fairmont, Okla.

Application June 25, 1946, Serial No. 679,202

2 Claims.

The present invention relates to improvements in grinding machinery and more particularly to a machine for grinding light materials such as grain, paint materials, etc.

One of the objects thereof is to provide a simple, efiicient and inexpensive grinding machine possessing the characteristics of sturdiness, dependability, ease of automatic operation, proper equilibrium of all movable parts and accuracy or" the timing of the various movable parts that accomplish not only grinding of the material but regulator feeding thereof for grinding purposes.

A still further object thereof is to provide, in a grinding machine, improved means for applying spring tension upon the grinding rollers when they have been brought together to coact for material grinding purposes, so they may yield retractingly as conditions in the accumulation of material upon the rollers or between them necessitates.

Another object thereof is to provide, in a device of the kind described, improved means for loosening the material which may have been lumped together at the point of discharge upon the grinding rollers just prior to a grinding operation performed thereupon, so that the material may not become clogged up or be supplied to the rollers in too dense a mass.

A further object thereof is to provide, in a device of the kind described, improved means for imparting rotation to the grinding rollers in a simplified yet effective manner as they are moved towards or from each other intermittently.

A further object thereof is to provide, in a device of the kind described, improved means tensioning or stretching the driving belt of the grinding machine which is responsible for imparting rotation to the grinding wheels in opposing directions so they may feed down into a discharge hopper the material being ground and having been ground.

A still further object of this invention is to provide driving mechanism for the grinding rollers so arranged and functioning therein, that they not only impart rotation to the rollers but also time and control the operation of the means for advancing and retracting the grinding rollers and operation of an agitator in the upper hopper for loosening the material in the latter that is to be fed upon the grinding rollers.

With the above and other objects in view, my invention consists in the arrangement, combination and details of construction disclosed in the drawings and specification, and. then more particularly pointed out in the appended claims.

In the drawings, wherein similar reference characters designate similar parts throughout the respective views,

Figure 1 is a front end elevation of my invention, Figure 2 is a side elevation of my invention,

Figure 3 is another and opposite side elevation thereof,

Figure 4 is a section taken on line 4-4 of Figure 1 looking in the direction of'the arrows,

Figure 5 is a cross section taken on line 515 of Figure 2, looking in the direction of the arrows,

Figure 6 is a plan view of the inner face of one of. the sides of the upper hopper showing manually controlled means for controlling feed of material through the chute of this hopper, 1 Figure 7 is a fragmentary section taken on line 'l! of Figure 6, looking in the direction of the arrows, and i Figure 8 is a section taken on line 88 of Figure 6 looking in the direction of the'arrows; Referring to the drawings, which are merely illustrative of my invention, the various parts ofmy invention are disclosed. The device or ma-; chine consists of vertically separated hoppers, a frame supporting the hoppers, means for drivingthe grinding rollers arranged in the lower hop-' per, means for intermittently bringing the rollers into and out of engagement for coactive grinding operation, and means for agitatingintermittently the material in the upper hopper that is to be supplied into the mouth of the lower hopper. l I

The framework of the machine will first be described. Thisconsists of the oppositely arranged base sills, the vertical sides l0, l I of which are secured to opposite pairs of upright sills, while their horizontal sides Illa, Ila rest upon the flooring. Four upright angle iron sills are provided at the four corners of the base sills, which are designated l2, l3 at one end of the machine,and l2a, [3a at the other end thereof. The upper ends of the upright sills are desige r nated l4. Resting upon these ends Id of the upf right sills are four more extension upright sills,"

also angle iron members, designated in accordance with their sides. The two rightangular sides of one extension upright sill are designated ll, Ma. The other extension upright sill, at the same side of the machine have their sides designated l8, l8a. Similarly designated angle iron extension sills are located at the other side of the machine. It will be seen that the two right 'jac'ent' .end'of the thrust bar 34.

angular sides of the extension upright sills rest upon the right angular sides of the main upright sills but with their webs at right angles to the webs of the main upright sills. These two pairs of upright sills of the frame may be secured to each other rigidly in any desirable manner. A rigid cross bar l9 spans the lower upright sills at each side of the machine being secured to such upright sills at its opposite ends. This effectively braces the lower framework.

The upper ends of the extension upright sills are designated 2!]. Attached: to these-ends .20 of the mentioned sills are angleirorr horizontal sills 2! arranged at opposite sides of the machine. The upper hopper is secured in depending relation to these sills 2 I. Cross bars are arranged at opposite ends of the machine, being secured end.

t opposite ends to the lower parts of the exten- I sion upright sills to brace the same. At right angles to the last named cross bars l5, and se- 1;;

cured thereupon so as to span the distance-between the extension uprightsills, at each side of the machine, are angle iron bracing bars I6 and If! respectively. The horizontal sills 2 4 are cross connected at their opposite ends and are located Y at opposite. ends of. the machine operatively-by the :sills; 2 3,24, two-in number.

The upper hopper of the frame has parallel side walls 2-! 28. and oppositely and downwardly inclining and. converging end walls 25, 26 which if produced to their lowermost ends would come to. a point. The upper ends of the four walls of this hopper are operatively secured to the sills 241, 21: and to the two cross sills 2:3, .24 in aimanner to: depend. therefrom so" the lower'chute part of. therupper hopper is directly over the mouth of the lower hopper about to be described.

The lower part of. theinclined wall 26. of the upper: hopper has an elongated marginal slot 36 formed therein, or is preferably spaced above the adjacent lowermost end. of the inclined wall 25 ofthesame hopper. This ,providesya discharge opening for the. material vto-comeout of the upper hopper when this. opening is uncovered by'av gate now to be described. Along a medial vertical line-of this side" 2.5- of the upper. hopper, asseen in Figure fi, aopair of oppositely arranged : keepers 35, 36 are secured thereupon in whichis-slidably guided a thrust bar 34 at its opposite'ends. The lower-end of; thethrust bar34., just after leaving keeper 35 is attached to' across bar forming the gate-between-the: ends of the latter. Keepers arealso. provided; at oppositeends along. the lower margin of this side wall 25 of the hopper, con

sisting-of inner base portions 33 secured to this 25. of. the happen. Between: its. ends this. operate ingjhandl'elever 3B his-pivoted 21.11.35v to thread- The. handle portion 'of'this. operating lever 36 is designated 38..

The lower end of theupper hopper, where its chute is located, may be rigid-1y or otherwise secured in position upon the frame in any desirabl'e' manner. I seat the lowermost end of wall 25 thereof upon an angle iron member lll'supported rigidlyuponpieces 47' secured upon the frame. The lowermost end ofw-all 26 is supported upon a 151;!(1117431 is also secured to theapieces fl- 4 The pieces 41 are arranged at the ends of the machine so that the bottom of the chute with its opening 30 extends transversely of the machine directly over the grinding rolls which will now be described.

The lower hopper is open at its top or mouth It is a box-shaped body having parallel sidewalls 44, .45; and end walls '42, 43. Inside of this hopper is a separate chute, which chute has a delivery end opening out of the side, not

end of the machine, as shown in Figure .1. This chuteconsistsof oppositely inclining walls 53, 54,

opposite the inner faces of the walls 42 of the lower hopper, a vertical front Wall 4819 at one "side of the machine and a downwardly and forwardly inclining bottom wall 48a which has an extension 49 projecting beyond the side of the machine and continuing the inclination of the bcttomwall 48a. Scoop-shaped side walls 50 delimit the extension bottom 59. this discharge scoop. is designated 51". Corner bracing angle bars. 46. are secured to. the lower hopper. Theinterior. of the. chute is designated 52.

:At the top. :of; the lower hopper the oppositely and horizontally extendingshelves 45a mounted thereupon, as shown in Figure l, provide. the mouth orpassagewayfifi of' the lower hopper at its upper end for material to enter which is dischargedfromthe upper hopper. A pair of oppositelyarranged' shafts 55'and 57 have their ends jcurnaled in opposite side walls of the lower hopper. The shaft. 55 is pulley driven, and fixedly mounted. The other shaft 57 is movably mounted and shiftable laterally of shaft 56 but in horizontal elongated slots 61,5111 formed upon walls 44., 45 of the. lower hopper propenand also project endwiseinto slide blocks '85, 85a hereinafter more fully described. Two preferably hollow grinding rollers 58, 59 are made fast upon the shafts 56., 5.1 respectively. Theend wallsof these rollers are closed as at 58a. The slit between their working surfaces, which :are fluted as at "50, is designated 3:8, when the rollers. are separated for this purpose.

.A pair of frames are arranged at :the opposite of the framebeing attached operatively to the sides 44, 45 thereof. As seen from Figure *1, endwise, these "frames have channeled portions 86 :in which the'slide blocks 85, 85a 'anereceived and :slida'bly heldand guided-in movement. Made fast upon the projecting end of shaft "517' which extends outfifrom slide block 85a, is a disc 980'. Made fast upon the projecting end of shaft 56, inline with discfltlc isadisc 9811. 1

.A large driving pulley 'fia'made fast upon the outer end of the shaft 56 and spaced awaya'from the side of the machine. An: endless belt is made use of dor'rotating'aipair of pulleys mounted on shafts "56', 53i, and another pulley is located on a rocker arm soon to be described. "The pulleys 5'4 and are held by collars 51' secured around shafts 5 6, 51', respectively. These collars are-secured fast thereupon by means of set screws or the like 58.. The collar "which confines the; third pulley 66 is held around a pin/69 secured at the upper end of a rocker arm or lever H, the collar being held against displacement from this pin B9 by cotter pin 58 which :removably engages this pin. The roeker arm =14 is. mounted-.oscillatingly. 'just below its'upperm-ost'end, eccentrically, upon a pin lz'ssecured to brace 'ba r Ill-,and is confined on the pin by :means 10f .a collar I13"w=hich embraces this 'pin Aicotter pinl lnremovably engages the The channel of pin I2 and holds the hub 13 on the pin nondisplacedly.

The lower end of the rocker arm H has attached thereto the hook end I5 of a contractile spring I6, the opposite end 11 of which ish'ooked onto the eye I8 of a bolt I9 which has its threaded the lower dead centers of the pulleys 65-and 66 respectively. It is proposed to so tension the contractile spring I6 by adjusting the screw bolt 19 in bracket 82 properly for this purpose; that the lower rocker arm end will be held at a bias shown in Figure 2. In this position of the rocker arm II, its upper end is shifted to the left of the frame, which moves the belt along withit, and causes pulley 65, made fast on the movableshaft 51, to move to the inner ends of the registering slots GI, 62, and Ma, 63 at the opposite sides of the frame. This positions the grinding rollers 58, 59 (Fig. 4) in touching or nearly touching relation, according as to how the machine is set.

Means is provided for advancing and retracting the roller 59 with relation to the roller 58. This is illustrated in Figure 3. Here it is seen that the disc 98a on shaft 56 carries a wrist pin I66. A crank has one end pivoted upon wrist pin I66, this crank being denoted at 99. The other end of this crank 99 is pivoted at 98 to the lower end of a link arm I6I, which is vertically disposed. The upper end of this link arm ml is made fast upon a pintle I62 that extends into the chute of the upper hopper and has its ends mounted in the walls 21, 28 of this hopper. Inside of the chute extending transversely thereof, is a blade carried by the pintle I62.

It will also be seen from the various figures that set screws 96 are employed which haveinner screw threaded portions or shanks 93 abutting the discs 980 on shaft 51. These set screws 96 are screwed into lugs 92 formed upon the frames 86. Lock nuts 94 are threaded upon the screw bolts 96 so as to abut opposite sides of each lug 92. Oil cups I63 are operatively carried by the discs 980. The discs do not rotate, but receive rotatingly, the ends of shaft 51. In Figure 5 it is seen that tubes 95, 95a are respectively secured at one end to discs 98d disposed upon the opposite ends of shaft 56 and attached to frames 81, 86b respectively. Located confinedly in these tubes at their inner ends are contractable springs 96, 91 respectively. The other ends of these springs project'beyond the tubes and bear against the discs 980 at the opposite ends of the shaft 51.

The use and application of the present invention is as follows: The parts are normally set so as to place the two grinding rollers 58, 59 either in contacting relation or in such a nearly engaging disposition as to leave only the narrow. slit 48 between them seen in Figure 5. This depends how the screwbolt i9 is adjusted in bracket 82, which determines how far the rocker arm II will be tilted o make its upper pulley carryingend tension the belt as well as make pulle 66 carried by this rocker arm move to the left to cause pulley 65 to move also to the left and carry shaft and roller 59 along with it. Of course in thus presetting the rollers regard is paid to permitting material from the upper hopper to be positioned between the grinding surfaces 66 of these two grinding rollers.-

This having been done, the pulley 63 is set in rotation. Material to be ground, such as paint or coarser material such as paint materials, is introduced into the upper hopper. The operator stands by to operate the hand lever 36 controlling the gate 3| which covers and uncovers the discharge port 36 in the bottom chute end of this upper hopper. It is seen that when the operator raises up on handle 38 of lever 36 the effect is to raise also the thrust bar 34 to which the gate 3| is attached, so this bar moves upwardly into its keepers 32 and uncovers the port 36. The material in this chute is now free to drop into the mouth 55 of the lower hopper upon the peripheries of the grinding rollers 58, 59 upon both at the same time.

As the pulley 63 is being rotated operatively, it sets the belt in motion. As the belt moves around the three pulleys 66, 64 and 65, it sets the same also in rotation. This is done as follows:

The lower stretch 84 of this belt travels in the direction of the indicated arrows or to the right. In doing so it rotates the pulley 65 on shaft 5! counterclockwise, while the bowed portion 860 of the belt by means of portion B'In which engages the under side of pulley 64 on shaft 56 causes pulley 64 to rotate since this pulley is directly made fast on the shaft which carries the driving pulley 63. As the belt thus travels it also rotates the pulley 66 counterclockwise. Pulley 64, in rotating, turns clockwise in order to make the lower stretch 84 of the belt travel to the right. In this way all three pulleys rotate constantly.

During each rotation of the shaft 56, the wrist pin I66 is carried around with it in a cycle, which carries crank 99 around in a cycle also. As this crank thus moves around with shaft 56, it oscillates back and forth the link arm IN. This causes the blade I64 in the chute of the upper hopper to oscillate in unison with the link arm I6I. As this blade is thus oscillated the material lying in the bottom of the upper hopper in its chute is agitated forcibly and put in a sufficiently loose condition to drop down by gravity freely out of discharge port 36 into the mouth 55 of the lower hopper, where the material falls upon and between the crushing sides of the rollers 58, 59.

As this roller 59 moves away from fixed rotating roller 58, the contractile springs 96 and 96a which are secured to. the collars 98d expand automatically and thus tension with spring pressure the rollers. When the roller 66 approaches the roller 69, on the other hand, these springs are compressed and again the rollers are tensioned. It will also be noted that when the roller 59 moves away from roller 58, so that its shaft 51 moves towards the outer ends of the slots GI, 62 and Ma, 63 at opposite sides of the machine, the belt is carried along with it on pulley 65 made fast on this shaft 51. In doing so, the belt tilts the rocker arm II forwardly, and this moves the lower end of the rocker arm rearwardly against the tension of the contractile spring 16. Contrariwise, when the roller 59 is advancing towards the roller 58, rocker arm II recedes back to normal position under influence of the spring I6 which now may relax and cause this motion. It is thus seen that when the roller 59 advances towards roller 58 pressure springs 96, 96a are compressed, while spring I6 contracts, and when this roller 59 is retracted or moves away from roller 58 springs 96, 96a expand, while spring I6 expands. Equilibrium is thus maintained at all times necessary l f r-.-=l- 1c:1 ns1 t e rollers-in. ,7 ru tindinsrpqsitionmc 1 yieldably.

Ther pri e-vtensi ned roller e'iena leithe;material.:; ing:. ushedwbytthei. rind ,gza ie. e r,

r ll rs; 5 8; 5:5 1;; :t move the roller apartacoord ne: 5

to the: density of their;-movin sqmass When I thesewrollersop p; heqmate ia -s fr sh yaqi pq -r massllas, been1:crushedarth rrr e .wwleenwthey:

separate; widen-the.- pass ge between thems lves :10 to. -;fre,ely; permit: the gro.und materialzs sdrop;

down; into-the nclining bottom of the; chute 1 in; thEy'lOWBI hopper indicatedat wan- Byegrav theground mass 'is Cal'rid "dOWn-1 17118111 101 intoathers oopsfi i r n discha ged into a a suita le receptacle; 1

I dQinot meanto onfine myselfi o the exams-1,

details of construction herein disclosed- -saqevascoyerediby thez ppended cl ims. I

What: I desire tQClELim; is 1 1. In a device as, described,,. a vifrall le, a paillio fi. oppositely arranged slidevblpeksguided therei a (shaft having its endsjournalled inssaidoslideij o a second shaft; h ving i s d fixedly;

rocker, ;ar.m.,: pulleys made fast on the shafts and il'lggllllfi Wit-hf therockerarm.Pu11ey,;a belt trained 30,

aronndethewsecond; pulley, around the pulley on 4 the shafton the slidable;:b10cks and boWed-intoengagement with ,-the; under side of the-remain-- me -pulley} a spring having one" end wfixedly-y mountedomsaid frame, andthe other connected 35 to thee-lower end of said rocker arm for tilting said rocker arm to slide -the-s1ide-.,lo1ooks. to, positions in:

arm spring 2; In a device-as described, a frame,--a pairof,-;

oppositely arranged slide lolocks guidedtherein-,; a .45;

20 c u terdire tio rrand":for tilting said-rocker ar 8 a s aft hayingits: sandssj urn lledin rsai s ers blocks, a second shaft having its ends fixedly journ lleid in s diram tza iv nel-lpu leyr ade f astmn the latter, shaft at -one; +end, rollers: on, 1. said, shafts, a rocker; arm pivoted adj acent-, ts--,.,- upper end; to: said frame; a second pulleyjour nallecl atthe upper end of the-rocker arm, pulleys r. made, fast pnqthe shafts iand in line: with thev rock er arm wpulley,;-a qbel-t retrained- 1 around the second;rm lley, around thepnlley of the shaft: on; p the; slidable blocks: and bowed. into engagement- With,-;=the under; side :of gthe remaining pulley, :a sprin having,oneeend fi e wm u ecl n said-r; frame, and thefother; connectedto wthe 1ower,;.;- endof saidtrooker -arm;f;or -ti1ting;said rocker ar to slideythaslideablocks; to positions-1 in which th twmshafts;approach each other, and 1 expansibl means between the en ds of theshafts for eng ing;;said,.- slide b1ocks-aancl-v movingthem 'in ea ;c .unterd recti neto tensionesai ek rr an, h ine; 1

- W LIAM 2P-.-,-B A. E,-1;

. are]?harem;Es.v CITED; Thej llowin r fe enc s re fr rdinrt et filewof mthis paten 1 UNITED STATES PATENTS i Nwnber, Name Date v 253,113; Seek Jan, 1 822; 259,479 I June;,l3, ,18821'3 642,017 Sturtevent; Jan.- 23;190$l;- 879,423 Sturtevant 1 Feb5163 1908 1 935,630.. Abernathy Oot. 5,-1'909-1 1' 1,027,206. 'Ingraham'; May 21:; 1912"" 2,086,659 *2 Armstrong July 13, :193 2,144,841 Glaser Jan.,24, 193 2,174,116; Bil'ocq Sept. 26, 1939:;

FOREIGN PA'I'ENTS Number; Country 7 Date TaIYnce: V Apn, 30,1828; 178,550 Great Britain Apr}; 18,; 1922 541,583. GreateBritain V Dec.72,,,19511; 1

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