US2395915A - Press roll for papermaking - Google Patents

Description

H G. SEECHT PRE SS ROLL FOR PAPER MAKING "M a rch 5, 1 946.

2 Sheets-Sheet 1 Filed ,July 15, 1942 H. G. SPECHT PRESS ROLLQFQR PAPER MAK lNG March 5, 1946.

Filed July 15,1942 ZShets-Shef 2 in press rolls. While of thefp'aper bingmade; I c the present description) th fgenera1, term .bre -g roll is "to be understood as appl'ylingtoanvof' Patented Mar. 5, 194 6 V v T W y" 13, iaihsenal The present invention relates to improvements, 1

theprinciple"of thefinvenespecially advantageous in paper machinery; and particularly in the presspartof such machines,

where the precise functioning of the'pressrolis plays animportant part in the qualityand' form -Fo'r the" purpose or the various rolls in relation-to'whi'ch the paper sheet passes, included in' which are dandy rolls,

couchrolls, suction pressrolls, felt supporting press rolls, and felt guiding and'i tensioning' rolls.

Because "'ofthe special requirements 7 of "the ffelt supporting press rolls, the" present description and illustrations are, for thesake'; of l convenience, directed to these, but

closure. 7 The press part of 'the' paper rnachirie' consists of several sets of press rollsyusually three, each "consisting of a bottom and a toproll between which the felt carryingthe papersheet coming ofithe Fourdrinier part of-the paper machine is:

- and suriace coverings.

asefle xibilit yi weighhidiameter,"surfaceformation I serving the life ofthe felts, but such rubber cov-- eringi results *Iin an increasei in the 1 width of contact between v the vrolls and a-sacrifice of pres- "sure, so that the paper'sheet-:;goes tot'the'driers containing zadarger-portion of, watera-than-would I be the" case. with" afbottom; roll without a rubber the applicationof the 'invention in other useswill be apparent froi n this 11 fed; the bottom'roll supportingizhe felt and paper and the top roll exerting pressure thereon ,to squeeze water from the paper sheet." These rolls are supported" at their ends," the being usuallysupported in journal bearingsflxed to the frame of the machine, while the top roll is supportedat its ends in journal bearings car,-

bottomroll.

. crowning of the rolls causes the rollbody-to deilect during each revolution and if this defieotionis to takeplace-without "producing uneven; pressures upon the paper sheet, the roll must have ried upon movable arms which 'adjustably posi- 7 tion the roll in predetermined spaced relation to the bottom roll; and upon which arms-suitable weights or pressures are 'applied'fon the purpose 3 of obtaining the desired pressure on the" felt and sheet.- The rolls are therefore-vinthe' n'abeam will deflect-or 'ture of beams, and 'as any 7 its supports; because bend more or less between 1 the rolls tom-provided with any surfaceorstructural characteristics desired for the; purpose of obtaining efficient water, removah; perf, ect 1- paper 401 and long felt life and of its own'weight and because=oi"opposi te pres-- suresa'ppliedat its endsand atitscentral portion, it has been necessarylin order to establish a uniform spacing and "pressure at 'the nip 'betwe'e'nthe bottom'and top'rolls toprovide their i surfaces 'with a predetermined crownso'thatthe downward deflection of the bottom roll'and the upward defiection'of the top roll wiil'result in a parallel relation of the rollsurfaces at the amp, I As numerousvariables enter into 'theconstruc of the-proper crowning is an 'extremelydiillcult j procedure; and m order perfect results various compromises *andi'sacrisuchroll characteristics" to obtain approximately fices' are necessitated in It is obvious; from the foregoing; deflecting cylindrical press -roll without crown-'- without compromise oor I I I with the diameters weights lengths andapplied I pressuresof the rollstfa ltgisican object of tl 1eby the fact that, a crowned ,roll has a greater "surface speedat itskl'arger diametercenterporf tion than -it-does atjits smalleri diarneter'ends,; causingslippage betweenthe roll and the feltand resultingaimwear upon the felts and a; tendency to inon -uniformity in the paper: sheets IAlso- .-the

a pronounced degrecoi' flexibility,,5 .f

ing will obviate the numerous disadvantages ,of the previously known press rolls and will enable surface and formation,

inventi n-59 p1 ride anon-deflecting cylindrical pressrollwhich i is capable of .use in any fof the ,variousparts of the paper machine, either; alone,

as a top press roll; as ,a bottom roll; "or; asfboth' V toprovide .such roll tion and" operation of these rolls; the provision beam arid the cylinder, the

' top and bottoin'rolls. 'It is 'particularly proposed in the formofarotatable .tubularcylindeii, through whichvisjeng'aged a non-- rotatable supporting beam capablejoff deflection within the tubular cylinder, and

A Forinstance; therbottom roll j isi'usu'ally covered withrubber for the -pur-' pose "o compensating; for'wfaulty crowning; or variations in'defiection resulting from the applig cation of difierent pressures; and als'o forxprethat afz'idn- Y between-which i re ars'amn aa-senes V orsressure =e1emems ;suitablyspaced alongfthc I lerigthoftheiheiini an'd'cylinder 'whereby cornir Fig. 12 is v shown'inlis- 11 in pensating variable pressure may be applied between the variable points of deflection of the beam and the constant straight cylindrical surface of the tubular cylinder. Such pressure elements may be of any desired form, but preferably. consist of inter-connected hydraulic units wherein there is obtainable an infinite degree of compensation and variation between the several units, resulting in a uniform application of pres-- sure acrossthe lengthot theroll irrespective, of

, variationsin the degree of deflection of the beam.

As-this uniform pressure across the-roll; is 'directly proportional to the applied pressure upon the roll, it is obvious that any desired pressure may be applied at the nip between the-'rolls.upon the paper sheet and felt and that the pres-- sure per square inch will be uniform across the" paper 'sheet,,thus resulting in a uniform :removal 3- v of water and a uniform surface formation and.

paper thickness. 7 V

= with the above and other objects inaview, em-

' v bodiments oftheinventionareshown in the accompanying drawings, and thesevembodiments willibe hereinafter more fully described withreference thereto, and the inven "pointed out inthe claims.

Fig. 1 is a side-elevation of a pair of press V incorporating the invention, the right hand end beinsbrokenaway. p Fig.4 isian; end elevation showingthel sup pom blfly'lng lever of the top :s isaview, partially inside elevation and partiallyin vertical-section oi the-lefthand end 7 of the top press roll; incorporatingthe: invention.

and'on a so'mewhat larger scale than the'scaleoi 7 Fig.1. f-- s: 4 is a'transverse .verticalsectionalview,

taken along the line Hof- Flgg'3. a

Fig. Bis a perspective view or one of the pressure appbingunits.

Fig. 6 is l s spectiveview of a section-or the deflecting beam, partially broken away, and show ingfone ofthelbeam supported hydraulic pressure applying mm for cooperation with the cylinder engaging pressure applying unit :iilustrated'in Fig.5; 1

Fig. I is a transverse sectionalview.

' a modification of the invention: in which the hy- 'draulic pressure lows member. a i 7 Iiig. 8 is a-transverse sectional view' of another modified tempt the inventionin whichthehyapplying unit consists of a beldraulicjpressure applying unit consistsof a.hy-

draulic cylindermember. 1 a r Fig. 9'is a view, partially in side 'elevationand the tworollsin spaced static relation.

a crowned bottom and showing the two rolls in spaced static relation.

Fig. '14 is 'a similar view of the press rolls as shown in Fig.13 in operative. relation with the top roll beam andthe bottom roll deflected.

Fig. 15 is a diagrammatic side elevation of a pair oi press rolls, in which the top roll is crowned and cooperates 1 with a bottom roll according to of the bottomroll deflected.

Fig. 17 is a diagrammatic side elevation of a pair .ofpress rolls, in which both the top and bottom rolls incorporate the invention, and showing Fig. l8,,,is a similar view of the press rolls as shown in Fig. 17 in operative relation, and showing the beams of the top .and bottomrolis denested esists... "ahtmaers indicate, corre spending throughout the several figures .oi

Referring. to the] drawings, more particularlytoFigs. l-to dgthereoi. the bottom press roll ,10 as shown in Figs. 1, and .3 isn't heretofore ;known;type, and, is supported at its shait ends ii in Journal bearingsupports i2 mounted upon the frame. i! or the machine.

, place, and which are the pressure applying the beam and the roll ,as will presently more fully appear. 7

' from ,dicated generally as J1, upon each end of which there is secured, preferably by welding, an angu- This bottom-troll form in installamay be of'strai'ght cylindrical I suchroll may-.be oi sumciently tions where large {diameter and relatively short length that :there is no appreciable deflection and crowning isnot necessary, or it may beslightly crowned to compensate for any calculated deflection between :the bearing sflPDOrts l2.

The. upper roll, whichincorporates the invention, comprisesa cylindrical tubular roll member N adapted to be driven by any suitable means, as for instance drive gearing engaged with the ring seari [shown secured in one end oi' the roll ll- At suitable lntervalswithin the roll ll, there are provided track rings 16, preferably welded into adapted to be engaged by units cooperating between and projectins each endisa deflection beam member, in-

Extending through the roll lar, bracket ll secured by bolts I to the supportingand pressure applying lever arm :20, pivotally mounted at 2! at each end of the frame member I 3, this leverbeing adapted to be raised partially 'inverticalisection, of a further modinedform of the invention in which the hydraulic pressureapplying means consists ot a continu- ,ous hydraulic hose member.

' Fig. lois' a' transverse sectional-view, talren f along the line 101-" of Fig.9.

r I cperativerelation and showingthe twor'ollsdeiiected i ii .5 p i r Fig.1: is-a diagrammatic side elevation of a 7 i atom s. w ch we r011- in accordance withtbe invention, with inch along the length .23 engagedinthe nip applying-means for the andiowered to-adiust the spacing between the top and bottom rolls and to have pressure applied to itsouter end for the purpose of pressingthe top rolltoward the bottom roll. the amount of pressure applied to the leversv beingdistributed as substantially uniform unit pressures per square of-the roll to impart unifeit -22 and the paper sheet of the rolls. The pressure v lever may be of any suitable type, as'for instance, the hydraulic cylinder 24, as shown in Fig. 2, or the usual mechanical typein which power multiplying levers and weights areconnected to the lever.

The beam "is conveniently and economically form pressure to theconstructed from structural steel beam members of standard form, the preferred construction as illustrated consisting oi" an I-beammember ,2!

constituting a corefor the beam, a pairrot side .ing. atjeacli side thereof, a pairofcha i q of t at t m m 1 246 ia lli ed at their lower inwardly extending flange portions to positioned at the upper ends, the three rollers I w it 3,

plate strip members a e-it secured at each side n being provided with holes sc -4s n alignment ofth; I-be'am member to the edgesfof' its (upper dnlower ii'angesnajtob' late strip, member If! 'secured tothe upper side oi the 'I-beajmand the 1115 r edges Q! the Strlpmen ibers '28 and project side members 28 -28 of relatively g; A than the I-beam member secured to a pair of angle-beam'bottom members {acag, a

having their vertical" flangesfdisposed inwardly in spacedrelation to monomer andbroiecting downwardly to provide at; the Ibase "or the beam which the' pressure-applying cylinder engaging' 2P2! are braced at suitable "intervals by pairs a 1 structure a longitudinally extending guide slot in of block, members 30 "secured petweeni hm T and, which with the vertical flans'eslof the anglebeani' members constitute vertical rectangular guide passages, for the pressure anpli lln g'f nlts- In vertical alignment with the; 7 vertical central "8 l-W-3 I, toiengagement withthe'vertical' side arm;

portions flof the cylinder-engaging,pressure ap- .25 H ipl ne n the e an r u eh s ts s im 191 11 in e o e 9 1 wes th dns beam. and the cylinder. engaging pressure-apply- 1 in'g' j units. a In or er-"to accommodate this hydraulicnpressjure-hose the deflection beami's somewhat .jmodifled in "structures from that employed other embodiments'ot. the invention"; theI-beam 1, member Hbeing relatively 'narroweirinl widthi upon' the outer sides o1 tit e, channel beam 'membas n- +28 vertical guide and positioningblocks plying members, as willpresently more li'ully appeaig. The 'several'parts oi. the beam member are" will be understood that they may be riveted or; otherwise suitably securedtogethenjQ andthe side arm parts of whichare yrtical "and parallel to the sides of theibea'm. Between the yoke portions32 32, there are rotatably -sup: ported' upon shafts '33 three rollers 34 onej of eserollers being positioned centrallyjiof-the lower end of the unit" and the othectwojbeing tom roller 34, this pillar member being suitably shaped and dimenslonedtofliave vertical sl iding' movement in the guide passage of the beain'mema conveniently secured together by, weldin lbut it J T e. c l n ne s s p essu e-a ly ng u its; which are provided at suitably spacedjpointsalong the length of the beam and cylinderflea'oh con- 1 sistS ofapair of substantially U-shaped yoke per-1 tionsi32-.-'3 2, the lower parts of which are-prererably arcuateand concentric to the cylinder [4.

with thebolts i'laccess thereto by'suitable cwrenchxneanai Each ot the hydraulicl'presure-applying diaphrcgm'units 36 is connected by a'jcoupllng connection 1i! to a pipe member "I10; hich is comm t e eve lhydtaifli fpressure units; and'extends through the longitudinal "space of the beam between one ls'idejof thecJI-beam member at andoneiot theside platenienibersfl outwardly; at -*one {end through the angular fend a 1. B1 wh r We w t asi i a s m 10f hydraulicfluid pressuresupplv'.

"In Fig. 7, 111 v' 41111 trated"a. modiiic china which we hydr ul c ressure j bplvini mti onsists'ot e ny munc;;pe iows w: seam-mg; s 1' we l r tedjen th rmqdi t h imwm h ,thefhydraullcpressili'e ebblylngiunit onsistsotl a hy raulic c linderi ax'n i .th se" ii1i ts eing:

=n -b mea s, Q1 e bolti"flitQlfihTbaS I a flangeofthefI-beam in similar, manner to the "connection of the dlaphrflgmlllmtiil bodinientillustratedinFigs. H061 k Flgs.'9 and IOQ'Ifha Ve illustrated afurther with timescaleeam bottom" ni beistzayzsn provides] a relatively dcepnarrovv channel in which the hose may be eil'ectually chanced;

T'At'ithe underside otthe l beajm member there is engaged a contact strip 42, extendin the j'length'oi the beam and groov'cedat its underside,

fas at,l 3',' to "en'gag'e,\,the upperfsidefot thetp ressure hose. The underside of the hose is engaged adapted tojengage'the trachmember lt of theli rotatable cylinder it, so as to provide substan-' tially equal spaced anti-"friction rollersucporttior by'aseriesjorpressurje shoe members lfleach provided with a,: groovedupper surface 145 for engagement f with c the hose, br ef of these block mbers being; provided in reiatidnrmeaen ot- 7 the "cylinder-engaging,pressure-applying? units; v and their upper portions slidablvcontactingwith veach"other at'theire ztrex'nities sons to. provide a continuous grooved, su rtacel ion engaging the 1 hose. Centrallyin the underside of each .block berlprovlded between the block members"3'0','the-" {upper siilrifakxe of the pillar portion projecting upjwardly into'thebearn member in opposed s'pafc'ed relation'tothe bottom flange'of'the II-beam member 25; which constitutes a longitudinal filati'orm su port for the series. oi hydraulic pressure-applying units arranged to exert pressure between the t ler portions and the beamfi' The hydraulic pressure-applying units ma'y be of any suitable type, and are shown in the eim bodiment illustrated in Figsyl to 6 as consisting -ot'a series of hydraulic diaphragm units 36' se-' member,' there isprovlded avg-rectangular recess 45:corresponding in shapeto and adapted to interlockingly gengage over the pillar j portion 35 otfthe cylinder-engaging pressure applying unit. j The side surfacesot thepressure shoe members are parallel and their thickness" is such thatthey .have sliding engagement for-vertical movement between the-angle-beam members1'-2I --28' and the side plate membersIB -N' oi the deflection beam. i

i "I 'he operation is substantially similar tof-the other embodiments of I the invention; the fhy-j 'd'raulic pressure hose ll exerting pressure be tween the pressure beam and the individual cylinder 'eng'agin'g pressuieapplying" units f so that 74mg d 9 d fl wtt fi w nd um ew 2 w s iraan r fthecnijdraulicpressurehose.lliis extended throughgth r. A

in'ithe n van heu p e arm-members 20fi-+ 1b. s

1 extended below the I-beammeniberintof ontact 4 7 35c jwhe'zei is s c 'd toi'th em mh rs dtc he inneredgesoif the lowerflanges.oiftlieyeli m m b W-"- -."CT1% t n'bla e trip rme nber .11! and the; verticalg'uide and position in; blocks 3 I! are substantially inflame las inJtheQpther embodiments. This ommen e assure 5 meat therein. and whereby a deflection cap is produced between said roll member and the de-, flection span of said beammember. a series oi longitudinally spaced roll support means arranged internally of said roll member uponwbich said roll member is rotatabiy supported; a series of hydraulic pressure-applying means interposed interposedin the deflection gap between beam member and said roll member.

8. In a press vroll structure for use in paper I makingfa rotatable roll member-open at each in the deflection gap between said beam member and said respective rollsupport means, and hydra'ulic pressure means common to and connected. to said series of hydraulic pressure-applying means. Y 7. In a press roll structure. a rotatable roll member having a lonzitudinal space extending therethrouzh, a longitudinal deflection beammember non-rotatably supportable contiguous to its ends and having its deflection span ensued within said space for relative deflection movement therein,land whereby a deflection cap is produced between said roll member and the de T tiection span of said beam;member.-and' a by draulic pressuroapplyins hose-member extendend and having a, longitudinal space extending entirely therethrough, .a' longitudinal, deflection beam memberv disposed in said spaceentirely out of contact with said roll member and projecting at its ends beyond the open ends of said roll member, supports at each end of said beam member fixing it against rotatio'mthe span of said beam member between said supports adapted to have means interposed in said deflection gap, mounted for yielding and pressure applying movenient upon said beam member 'substantially'paralleland coincident toits-vertical direction ot deflec- HARRY G.

. tion,and'rota tably'supportins'said roll member, inzlonsitudinallythroushlaldroilmember'and Y v

Images