US1936972A - Single-roll grinding mill - Google Patents

Description

SINGLE ROLL GRINDING MILL Filed Jan. 21, 1953 2 Sheets-Sheet l NOV. 28, 1933. Q SODER 1,936,972

SINGLE ROLL GRINDING MILL Filed Jan. 21, 1933 I 2 Sheets-Sheet 2 Patented Nov. 28,1933 V I 'U D S S i 'I V 1,936,9'12 I I I i Oscar Seder, Niederlen z; switierland 1 Application January 21, 1933, Seria1.-No. 652,884,

and in Germany February Z, .1932

- Claims. (01. 83514) r This invention relates to single-roll grinding leverarm, the grinding pressure can be very mills wherein aroll cooperates with a counter quicklyset to the required value in t everyseotion member secured on a swirigable carrier member of themill and controlled atza y m t and urged against the roll, through an interh mp nyin dr win s a c n r c- J8 vening lever system, by means of a weight distionail form of 'fi is illustrated; by 60 plaeeamy arranged on a lever am; i Ofexample y, i which I i Heretofore, in mills of this type, the lever arm 1 Shows all, elevatiolrof a g el milll, carrying the weight was inclined to'the horizon- 2 s a c o s sect o of the ill,- a tal which inclination varied with the wear on Fi 3 is a view or a detail of Fig. 1 one lar r the counter member increasing. Due to, this scale, and I i t 65" variation of the inclination of the lever arm the g 4 is a'section 0n 'fih I inFlggrinding pressure between the counter member Referring to t drawingsnl r p n 1113116 and the grindingroll is'also changeable, so that grind-mg 1? the counter i e I with such an arrangement it is necessary to grinding speoowhicli tapersiniho-direotion o r 715 readjust the weight along the lengthof the lerotation the roll- 'By'subdividing' n 710 ver arm for'obtaining the samegrinding presmember, Several sections of thomillare m d sure with iiiirereiit'ineiinations of this arm. Fura disposed i e by side. In Fig. 1' only-the thermore, with this construction it is impossible s and lastisections' are completelysh w nto read off the magnitude of the grinding presindicated by the do -s d r sure with the aid of a scale on the lever arm, as ing r011 1,.which' maybe common to allsec- 75 the divisions oi the scale could only be adapted time, isumounted on shaft'e which actuated "to a certain inclination. of the lever arm and byimeansof a'pulley 9 member with any other inclination the indications of is pivotallyarranged on a pin-7. fasten d to acerthe scale were erroneous. Therefore, as; with Tier 3 can be fixed thereon by tightening the known mills of this type the adjustment'of a theniitso of the pin i i r t i i s of i e so constant grinding pressure of an exact predeterjustment relatively to the gr nding ro1l.; For-as:- minedimagnitude is impossible the'lgnown mills s 'sting in adjustin t r d spa eBw y were incapable of yielding a product of a certain means i o lm 2, a Set --screw 9- fineness of grinding and conseguentlyjwere not d d'o the carnerarm. "T garner v pre'eisibn device-S; I arms 6 are linked with their lower-endstoa aeeording'to the invention these drawbacks shaft 11 mountedi bearings j d are eliminated in the mill by prj viding an exupper ends 6" of 'thecarrier arms are provided tensible intermediate memberjforengaging the with incisions rr s t l-b e -s i s outer end .of the carrier .arm in a disposition of a cvlossheadi T h e t d v '35 approximately perpendicular to said ar and on'an adjusting sleeve, 13 provided withfa con-" connected to thelever arm carrying the weight, F 0 disc 4 and'screwed-on a rod 1 'aS t0 the arrangement being such, th t th d lever be; adjustable on the'rod 15 by correspondingly arm isadapted to be set with'respectto a"contuifiifig the disc 1 f g d trol stop member in substantially horizontal y shciuldels 011 the fl J fl SleeVeTfor oup ing 40 position by adjusting the. intermediate 'memb'er these two parts for common movement, Therod V This arrangement permits that inanyjcon'dition 15 is pivotallyoonnected to'a crank arm '16 which of wear of the counter member the lever .arm is secured on apivot pin l'lwhich ismounted'in carrying the weight can be adjustedto occupy a abearingsuppOrt-IS andfixed with its other-end horizontal positionby adjustingthe intermediate to a lever arm 19"(Fig; 4) 'On the lever arm 45 member. In this manner, by displacing the 19 'a" weight 20 is displaceably arranged and weight along a scale on the lever arm, a certain adapted to cooperate, by meansof a handl'e pie'ce grindingpressure canbe invariably set and con 20,with notches 21 forfdefinite-adju'st'ment' into A trolled at any time. different positions on the lever arm19. iBy ac- This device is particularly advantageous for tion of'the weight 20' the counter member 2 is 50 :mills wherein, by subdividing the counter mempressed against the grindihgroll 1 throughfthe 10s Joer, severalsections' are formed,-as'in such mills intermediary of pivot 'pin 17, rod 15, arm- 16, each counter member of the various sections is and carrier arm' fi the magnitude of thispressure differently" loaded and' separately adjusted. being regulatable-by shiftin'gthe. Wei t 1 'Thuswith themill, according'to the invention, the lever arm 19. To a projection '18 on the 5 by shifting the weight along the scale on the bearing support 18 a carrier bar "22'is'se'cu'red' through the end of which a set screw 23 is screwed which serves for supporting the lever. arm 19, when the feed of stock material is discontinued. Ihe lever arm 19 is rearwardly prolonged beyond its fulcrum to project with an arm 19' into the interior of the casing 24 of the machine, Where it is provided with a bearing face which cooperates with a-cam. disc 25 on a shaft'25. By turning a hand crank 26 connected to the end of the shaft 25, cam disc 25, lever arm 19 andvthe weight together with it can be raised for retracting the counter member 2 from the grinding The lever arm '19 is thus held in the mill several different stock material each of which requires a special. grinding pressure, so that for example the first section is to be set toa pressure of 80 grams per square centimeter, the'second'secroll 1. raised position by the camwiththe grinding member relieved from the influence oi the counterweight. I 'Above the grinding space '3of eachsection of the mill, a pair of auxiliary rolls 27; 28 for coarse comminution of the goods that are admitted to 28 has; its bearings in a housing 32-which is linked'to-thecasing2e by means of a shaft 33. A screw spindle- 36 provided with a hand wheel and threadedly connectedto a stirrup 38 which isswingably arranged on a pin 37, isadapted to exert pressure on a'projection 34 on the housing 32. In' this manner the grinding pressure between the rolls 27, 28'can be adjusted by means of thehand wheel 35. The stationary rolls 2''! are carried by a common shaft 39 which is driven from'the main drive shaft by means of a belt drive including the pulleys 40 and 4:1. The adjustable rolls 28 partake of the rotational movement by action of the grinding pressure. As to each mill section a separate pair'of rolls 2'2, 28 is correlated and'oneroll of each. pair is accommodated in a separate housing, the grinding pressure between every pair can be set for each mill section separately and independently of the'other sections to any desired value. This is of particular' advantage, when through the same mill a larger number of portions of the same amount of stock material are fed in parallel; On the other hand it is obvious that the mill is also greater grinding pressure is effected along a line bearing between the pair of rolls'27, 28. ,.Whilst., between this pair the branny material is flattened out, in the grinding space only a sizing of the bran particles takes place without a simultaneous'grate ing effect. In this manner heat production in the grinding space is considerably diminished which also results ina saving of power consumption of 'themill. 1,

The specific pressure arising between the counter member 2 and the grinding roll 1, which is characteristic for the fineness of grinding,-"can be read on a scale on the'guide track of the lever arm 19.: The divisions of'this scale may be; so chosen thatreading off the absolute value of the specific pressure is rendered possible. With this arrangementfor the counter weight the specific pressure remains. constant evenawith fluctuations in the feed of the material and expansions due to heat in-the grinding elements arising.

; thelever arm 19 bears against the-same-when the feed of stock is discontinued. .Thereupon, the

grinding space 3. an b opened the maximum amount or set for any desired sizing by means of the control disc 14, in such manner, that the grinding surfaces contact but slightly or not at,

all. A slight contactis most advantageous for a proper grinding operation andat the same time no detrimental effects are exercised on the grinding other. On the continuation of the feed the grinding pressure sets in automatically and immediately reassumes its predetermined value. 1

When itiisintended to pass through the same tion to 60 grams, the, third section to 40 grams, and the f0l1I"h-SLClJiO11 to '70 grams and so forth, the counter weights can be readily adjusted to the respective positions and? the pressure con-1 trolled any time. I V

By raising the rod 15, the bearing studs of'the cross head 12 can be removed from the incisions of the carrier arm 6 whereafter the carrier arm is adapted to be swung out of operativeposition together with the countermember 2 even during therun ofthemill. The position-of the counter member 2 relatively to the grindin'g roll 1 can be precisely adjusted by means of the set screw 9-. Aside from this, thecounter. member is readily exchangeable at any time by loosening the nuts 8 on the pin 7. Furthermore, the carrier arm is so mounted on the shaft ll that it may be readily taken on" the shaft without shifting thesame. 7

By means of the hand crank 26 all the counter members 20f the mill are adaptedto be simultaneously released. 0n the other handeach counter memberf2 is adaptedtobe separately rendered inoperative either by rotationally displacing the control disc 14 'or by raisingand temporarily lockirig the leverarrn 19 carrying the weight 20 in V the thus retractedposition.

. The described device for settingthe grinding pressure including the adjustable and retractible' counter weight is applicable to any grindingmill comprisin grating working faces, irrespective'of thepresence .of means for coarse comminution. j 1. I donot limit myself to the particular size,

shape, number or arrangement of parts as shown described, all of which may be' varied without going beyond the scope of my invention as shown,

described and claimed.

WhatIclairn'is: V q 1. In a grinding'mill of the type described, in combination, a, grinding roll, a counter grinding member for said grinding roll, a leversystem conj and extending substantially perpendicularlyto said carrier arm, and: means for adjusting the length of said extensiblemember for setting said lever arm with theaid of said control stop into that predetermined substantially horizontal posie I tion which corresponds. to

the desired grinding P e sure.

2'. In a grinding mill of the type described; combination, a grinding roll, a counter ing member for said grindingroll, a lever syn tern connected with said counter grinding mermber, a 1ever arm of said system linked to the; casing of the millat the end of said system op-- posite to said grinding member, a pivot secured. to said lever arm, a crank arm secured to said; pivot of said lever arm, a. control stop for saidi 1ever arm for supporting the same in a substantially horizontal disposition, a counterweight; displaceably arranged on said 1ever arm for regulating the grinding pressure between said. grinding roll and said counter grinding mem-- her, a pivotal carrier arm of said system for said. counter grinding member, an extensible member linked with one end to said crank arm and with.

the other end to the outer end of said pivotal. carrier arm and extending substantially perpendicularlyto said carrier arm, and means for ad.-

'usting the length of said extensible member for setting said lever arm with the aid of'said. control stop into that predetermined substan-- tially horizontal position which corresponds to) the desired grinding pressure. 7

3. In a grinding mill, of the type described, in;

combination, a grinding roll, a counter grinding member for said grinding roll, a lever system connected with said counter grinding member, a le-- ver arm of said system linked to the casing off the mill at the end of said system opposite to saidi grinding member, a pivot secured to said leverarm, a crank arm secured to said pivot; of! said lever arm, a control stop for said lever arm: for supporting the same in a substantially horizon.- tal disposition, a counter weight displaeeahl y arranged on said lever arm for regulating: the grinding pressurebetween said grinding roll and said counter grinding member, a pivotal carmer arm of said system for said counter grinding? member, a slotted outer end of said carrier am, an extensible member linked with one end to said! crank arm, a rotatable part of said extensible member threadedly connected to the other end of its body, a orosshead mounted for rotation said rotatable member, lateral bearing studs provided on said crosshead for engagement in said Slotted outer end of said carrier arm in a sub. stantially perpendicular disposition to said carrier arm, and coupling means arranged between said crosshead and said rotatable'inember for common shifting movement of these parts on the bodyv of said extensible member on rotational displacement'of said rotatable member for ad justing the length of said extensible member for' setting said lever arm with the aid of said control stop into that predetermined Substantially :mined substantially horizontal position which horizontal position which corresponds tothe: 'desired' grinding pressure. e

I 4. In a grinding mill of the type described, in combination, a grinding roll, a counter grinding :member for said grinding roll, a lever system connected with said counter grinding member, a. 1ever arm of said system linked to the casing of? the 'millat the end of said system'opposite to said grinding member, a control stop for said Ilever arm for supporting the same in a substan-- tially horizontal disposition, a counterweight displaceably arranged on said lever armi'orregulating the grinding pressure between said grind-- -;ing roll and said'counter grinding member, a :rearward arm of said lever arm projectingbeiyond the fulcrum of the latter, a cam disc 00-' operating with said. rearward arm of said lever :arm for raising the latter and holding the same with the counter grinding member relieved from carrier arm of said system for said counter -grinding member, an extensible member inter- -calated between the outer end of said pivotal carrier arm and said lever arm and extending substantially perpendicularly to said carrier arm, :and means for adjusting the lengthof said ex- 'tensible member for setting said lever arm with the aid-of said control stop into that predetercorresponds to the desired grinding pressure.

5. In a grinding mill of the type described, in combination, a grinding roll, a counter grinding member for said grinding roll, a lever system con-.-

nected with said counter grinding member, a lever arm of said system linked to the casing of the mill at the end of. said system opposite to .said grinding member, a control stop for said 1ever arm for supporting the same in a substantially horizontal disposition, a counterweight displaceably arranged on said lever armfor reg- 'ulating the grinding pressure between said grinding roll and said counter grinding member, a pivotal carrier arm of said system for said counter grinding member, a detachableconnection arranged between said carrier arm and said grinding member, adapting relative adjustment .of the latter to said grinding roll, an extensible member intercalatedbetween the outer end of said pivotal carrier arm and said lever arm and extending substantially perpendicularly to said carrier arm, and means for adjusting the length of said extensible member for setting said 1ever arm with the aid of said control stop into that predetermined substantially horizontal po-', sition which corresponds to the desired grinding pre'mure' I OSCAR S ODER.

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