US2696767A - Beating engine for paper pulp - Google Patents

Description

Dec. 14, 1954 ELL 2,696,767

BEATING ENGINE FOR PAPER PULP Filed June 15 1951 4 Sheets-Sheet 1 Dec. 14, 1954 R. M NEILL BEATING ENGINE FOR PAPER PULP 4 Sheets-Sheet 2 Fileq June 15,1951

I: A N 79 I LI HH I HH Hlfl HI HHHHI l- IHHHHHH Hi l ll H l l Dec. 14, 1954 R. MONEILL 2,696,767

BEATING ENGINE FOR PAPER PULP Filed June 15, 1951 4 Sheets-Sheet 3 TI ME 5WITCH Dec. 14, 1954 R. M NEILL BEATING ENGINE FOR PAPER PULP 4 Sheetsdheet 4 Filed June 15 .1951

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United States Patent HEAT N NG N F R BERPULP RoberhMcNeill, Bury, England, assignor to'McNeill 'Wmterburn Inventions Limited, Bury, England pp ica Ju :5,. 1. rial No- 231,80

12 Claims. (Cl. 92-22) T is i ent n is enee a d with he t n eng n or "Hollanders for the treatment of paper pulp.

uch, machineseq pi se a la sesliam tet ot i 17011 mounted n bearlngs in a ,frame and having projecting b d s or homes in ts c rc m e ial. u a the, lowe P 8 e e l ee-qner in i h c e pond bl e o nive to on r m re b m ates fixe n s i f a d he upp r part of the r b ing; c e iiiby a d c easi g, betw en h c and. the t p pa t f a p r i of the frame known 3,8, the back-fall the bulk of the tre tedpuln is sho y c n r o e One object of the invention is to increase the prou ivity r e f a at g en in y e mi n h of the idle time, when the ,pulp is merely circulating in the trough An ther ebiee s. o r a e pr et y by introducin am llin e ie o ha n edd ti ie he ng ush ng a d u g perat ns ef' kh e there is also a pulv ri ing op ra io to a gr a ess ie ee- According to the invention, means is provided adjacent the top of the bachfall for periodically intercepting the usual flow of pulp. over the back-fall and retaining the pulp n the. roll chamber for a prolonged treatment. M ans may e pro id d r ma i lly nte cep n and resuming the flow of pulp at pro-determined intervals.

In th ormal b ating c n. e pu p travels o inuously around the Hollander, first under the roll, then over the back fall and thenround the trough back to the roll. In consequence, the pulp has to travel around the trough many times before it has been subjected to a sufiicient beating action. Ina Hollander according to this inven: tio as t e p p te s be ween h r ll and he ed- P ates, it is r a ned. in he o c amb r t r contin s be ti g action befor being r lea e fo sch r v the. back-falls The invention may be, characterised by the provision of, a wing valve between the top of the back-fall and the adjaeent part of the roll cover (or an extension thereof), this valve, in onetpflsition closing the outlet vover the a k ai nd i an the Pos tio ope ing h pa a eu h val may be p o ally o h ng d y m e on t e cover so s ohan pendmeusl rem i sp et ein ma ebl betweea a pos tion wher its o e ds e sa s lies elese toth a k-fall t ih ereep th nulp an a posi i n where sash l e e i in t ear f the t l t direc th pulp e er t e b ek llt vTh u al doctor o eth ro l my be retained i ch ease l be lifted well off the roll, and in one arrangement the wing a when op n may eQ-Qpe ete wit the d t r f r guiding the pulp a'waytrorn the roll, Alternatively, the doctor may be omitted,

The invention may include electric or electromagnetic means or hydraulic or pneumatic means or mechanical means for the periodic opening and'closing of the valve. When a hydraulic means is employed this may be under the control of a-pressure and exhaust valve, and in one arrangement, this last-namedvalve is operated by a clockeontrolled apparatus, whilst in another arrangement it is operated by a weight-controlled balance apparatus fed by running water., When a mechanical means is employed, h m y be p te y eans ve f m th el! tit e or from any part of the 'drive to the roll axle.

Th n n n may e se b he eet i e b the ee that the "valve isheldxin one extreme positionhy a spring r ht r t e a l: is mov d a the ther ex reme Pesitioh (against i ts at he spr ngor Wei ht) e example b arot'atms cam or by electro-magnetic means. In this last connection there may be an external arm on the pivot of the valve, to engage and be displaced by the operating means.

In its preferred forms therefore, the present invention provides apendulously-supported pivoted valve, above the back-fall of a beating engine, held in one position by a spring, and moved to the other position by a solenoid acting on a member outside the cover and fixed to the pivot of the valve, the valve in one of said positions closing the outlet over the back-fall and compelling the pulp to remain in the beating chamber, and in the other of said positions opening that outlet and closing the space between the beater roll and the cover, to, deflect the pulp over the back-fall.

Since in some circumstances it may not be desired to close the outlet over the back-fall, the invention may include means for holding the valve in the openpo'sition'. This means, when the operation of the valve is by a solenoid, may be such as to hold the valve open without interfering in any way with thesolenoid. For example, there may be a pivoted latching member movable into and out of the path or the lever arm orthe like on which the solenoid acts, and adapted when in'that path to hold the lever arm against any return movement, with the valve then in the open position.

According to this invention also, a beating engine is characterised by a hood or cover over the roll having on its inner face a series of deflectors, in'the form of ridges, vanes, plates, corrugations or like obstacles, such that any pulp whieh has not been thrown over the back-fall and is therefore carried around by the roll, When thrown against the cover by the roll is arrested by .said deflectors or obstacles and falls back on to the knives, only to be again thrown off against the deflectors or obstacles further around the, roll, the repeated impact with the obstructions on the cover on the one hand and the rotating blades of knives on the other hand having a milling or reducing or pulverising' efiect on the pulp, which assists materially in bringing the stuff down to the required particle slze and condition.

A representative example of an arrangement according to the invention is illustrated in the accompanying drawing, wherein:

' Fig. 1 is a diagrammatic vertical cross-sect1on through a beaterroll and its associated parts, the valve being shown in the closed position in full lines and in the open pos tion in broken lines;

Fig. 2 is an exterior elevation of the valve-operating means;

Fig. 3 is a sectional view (longitudinally of the roll) of the valve-operating means, and

Fig.4 is a side view showing the means for holding the valve open continuously when that is desired.

As shown, more particularly in .Fig. 1, there is a trough comprising the roll 1, the bedplate 2, the back-fall 3, and cover 4 over the roll, with an extension 5 over the back;- fall. Theseupartsm'ay be of any normal construction, the back-fall being shown as built on a concrete tonndation 6of the trough. Pivotally siispended-in the cover,,-v vhere the parts 4 and 5 adjoimi's a pulp interceptor or valve 7 in the form ot a board of wedge'shape in cross section, and this is mounted on trunuions 8 carried by .an'tifriction'bearings 9 in brackets 10 bolted to the side wall 11 of the cover. Thebraclgets 10 include the spacing members 10a which hold the bearings 9 away from the cover sides ll so that any water leak n out of h cover m d a n aw ou h v n access to the bearings,

On one of the trunnions 8 is fixed a lever arm 12, movable in a slottedguide 12a, the ends of which constitute limit stops to determine the extreme open and closed poi s o th valve! i 'e' ll ennee e to e a m 12 ea the n e f it enst s e ke 1 s s en e from the 12 1 r d 'eh' is e h ete to the h tser'lfi O a solen d de i e a mp n spring .6 ein P vided, ac n betwe e fixe r he 1 and n adjustable abut hee fi thered f The Spring ends o l v r 1e a ia .19 he os t ea hewain f s- Zrhi whieh p st: tion-the'valve'is closed.

' 9 91 of he .e ra m-lai tme "w t a save 9. la ch n "le e i p vetejll mounted at 21, on a fixed part of the apparatus and is loaded by a spring plunger 22 so as to tend to move in a clock-wise direction (when seen as in Fig. 2). A rotary cam or eccentric 23 is mounted in bearing brackets 24 and is provided with a handle 25. The latch member bears on the eccentric 23 and, in the position shown in Fig. 2, is held out of the path of the lever arm 12. The handle 25 rests on a stop member 26 extending from the bracket 17. However, when the handle 25 is rotated (clock-wise in Fig. 2) it allows the latch 20 to move in the same direction, bringing the lower end 20a into the path of the arm 12, whereupon, on the next upward movement of arm 12, the part 20a snaps into the notch 19 and holds the arm in the raised position.

The solenoid B may be energised intermittently by any suitable means, such as a time switch A, and this switch will, by preference, be adjustable. Clock mechanism may be employed to actuate a switch in the solenoid circuit, or there may be a rotary switch driven synchronously with the beater roll, or other control means may be employed.

Secured at intervals around the cover 4, on its outer face, are brackets 30 having upstanding portions 31 to the outer end of which is secured a boss 32. Passing through slots in the brackets 30 and through the cover 4 are deflector plates 33, the lower part of which projects through the cover into the space between the cover and the roll. As will be seen in the drawing, these plates 33, from the back-fall side of the roll onwards, are at progressively increasing angles to the vertical. The arrangement is such that, as pulp is thrown from the roll (more or less tangentially) at successive points around the roll, it meets the adjacent plate 33 at substantially the same angle.

To the top of each plate is secured a nut 34, in engagement with a screw 35 mounted in the boss 32, the screw being held against axial movement and being fitted with a handwheel 36. There will, of course be two or more brackets 30 for each plate, spaced along the cover in the direction of the roll axis.

In use, with the wing valve closed the pulp picked up by the roll is retained in the roll chamber and becomes subject to continuous action by the roll. However, when the solenoid is energised, the arm 12 is pulled up, which rotates the trunnions of the valve 7 and brings that valve to the open position where it also acts as a doctor or do flector to direct the pulp over the back-fall. When the solenoid is again de-energised, the spring 16 asserts itself to return the arm 12 and the valve 7 to the original positions. Any pulp not shot over the back-fall 3 becomes thrown off the roll and hits one of the plates 33, by which it is arrested and from which it falls back on to the roll 1. I

If thrown off the roll again, it hits another of the plates 33 and again falls on to the roll, eventually finding its way back to the trough ready to be taken up over the bedplates again by the roll.

Beating engines have been made in all sizes to suit the various paper mills, according to the requirements of their particular papers, and in many cases to suit the available fioor space. Possibly, also, changes need to be made to suit the mills power factor. This invention can be fitted to any size of beater and, under automatic timing control, raises the productive capacity of the beater by anything up to four times the normal.

Various classes of paper and various fibres, or mixtures of fibres, call for varying treatment in the beating process. This is easily met by roll adjustment in the usual way, and by setting of the timing of the valve so that the charge receives the required wetting or cutting, suitable for the particular papers being made.

When the beater is being filled with the raw fibre, the wing valve 7 is set at the open position, where it acts as a doctor, and the circulation of the beater charge is normal and the beating process can be carried out in the normal way. This also applies to colour mixing and the like.

I claim:

1. The method of treating pulp in a beating engine in which the pulp flows between a roll and a bedplate and finally over a backfall, said method comprising the steps of periodically intercepting the flow of pulp completely at the top of the backfall so as to cause all the pulp issuing from between the roll and the bedplate to pass over the roll repeatedly for prolonging treatment; and shooting the thus treated pulp over the backfall between the intervals of interception.

2. A beating engine for paper pulp comprising, in

combination, a trough; a bedplate arranged in said trough; a roll arranged in said trough above said bedplate; a backfall arranged in said trough adjacent to said roll; a continuous cover arranged above said roll and forming a continuous beating chamber extending from one end of said cover to the other and communieating at said other end directly with said trough, said one end of said cover and the top of said backfall being spaced from each other to define a passage for the pulp therebetween; a pulp intercepter arranged at the top of said backfall, said pulp intercepter having a length substantially equal to the width of said passage and being movable between an open position where it allows the pulp to be shot over said backfall, and a closed position where said intercepter completely stops the flow of pulp over said backfall; and means for periodically moving said intercepter between the open position and the closed position thereof so as to cause the pulp in said beating chamber to pass over said roll for continuous treatment between said roll and said bedplate.

3. A beating engine for paper pulp comprising, in combination, a trough; a bedplate arranged in said trough; a roll arranged in said trough above said bedplate; a backfall arranged in said trough adjacent to said roll; a continuous cover arranged above said roll and forming a continuous beating chamber extending from one end of said cover to the other and communicating at said other end directly with said trough, said one end of said cover and the top of said backfall being spaced from each other to define a passage for the pulp therebetween; a wing valve arranged at the top of said backfall, said wing valve having a length substantially equal to the width of said passage and being pivotable between an open position where it allows the pulp to be shot over said backfall, and a closed position where said wing valve completely stops the flow of pulp over said backfall; and means for periodical ly moving said wing valve between the open position and the closed position thereof so as to cause the pulp in said beating chamber to pass over said roll for continuous treatment between said roll and said bedplate.

4. A beating engine for paper pulp comprising, in combination, a trough; a bedplate arranged in said trough, a roll arranged in said trough above said bedplate; a backfall arranged in said trough adjacent to said roll; a continuous cover arranged above said roll and forming a continuous beating chamber extending from one end of said cover to the other and communicating at said other end directly with said trough, said one end of said cover and the top of said backfall being spaced from each other to define a passage for the pulp therebetween; a pivotally mounted wing valve arranged at the top of said backfall so as to hang pendulously from the pivot thereof, said wing valve having a length substantially equal to the width of said passage and being pivotable between an open position where the lower edge of said wing valve is just clear of said roll so as to allow the pulp to be shot over said backfall, and a closed position where said lower edge of said wing valve is close to said backfall so as to intercept the flow of pulp over said backfall; and means for automatically periodically moving said wing valve between the open position and the closed position thereof so as to cause the pulp in said heating chamber to pass over said roll for continuous treatment between said roll and said bedplate.

5. beating engine for paper pulp comprising, in combination, a trough; a bedplate arranged in said trough; a roll arranged in said trough above said bedplate; a backfall arranged in said trough adjacent to said roll; a continuous cover arranged above said roll and forming a continuous beating chamber extending from one end of said cover to the other and communieating at said other end directly with said trough, said one end of said cover and the top of said backfall being spaced from each other to define a passage for the pulp therebetween; a wing valve arranged at the top of said backfall, said wing valve having a length substantially equal to the width of said passage and being pivotable between an open position where it allows the pulp to be shot over said backfall, and a closed position where said wing valve completely stops the flow of pulp over said backfall; means for holding said Wing valve in one of said positions; and means for automatlcally periodically moving said wing valve between the openypositionaud theclo'sed position thereof so as'to eause' the' ul 'in said beating chamber to pass oversa id roll for continuous treatment between said roli'andsaid bedplate. l

6. A'beatiiig en ine for paper pulp comprising, in combination, an endless trou h; a bedplate arranged in saidtro'ugh; aroll arranged "in said trough above said bed late; a I tiaekfall arranged in said trough adjacent to Said'rdll; a continuous cover arranged above said roll andforniing' aooritinuous beating chamber extend ing-from one end of said cover to the other andcommunicating at said Oth'e'f'hd'dit'eotly' With said trough, said one end of said cover and the top of said backfall being spaced fromueaeh other to define apassage for the pulp therebetween; a wing valve arran ed at the top of said backfall, said wing valve having a length substantially equal to the width of said passage andbeirig pivotable between anop'enpositionwhere it allows the pulpto be shot over said backfall "topass around sa'idtrough,and" acl'osed position where said wing valve completely stops the fl w of pulp over said backfall; a spring forholding said wing valveiu one of "said positions; "and "means for automatically periodically 'rno'ving said 'wingvalve between the open position and the closed position thereof so as to cause the pulp in said beating chamber to pass over said roll for continuous treatment between said roll and said bed late, said nieans'for automatically periodical- 1y "moving said intercepter including a soleiioidarranged outside said cover and a movable member controlled by said solenoid and rigidly secured to the pivot of said wing valve.

7. A beating engine for paper pulp comprising, in combination, an endless trough; a bedplate arranged in said trough; a roll arranged in said trough above said bedplate; a backfall arranged in said trough adjacent to said roll; a continuous cover arranged above said roll and forming a continuous beating chamber extending from one end of said cover to the other and communicating at said other end directly with said trough, said one end of said cover and the top of said backfall being spaced from each other to define a passage for the pulp therebetween; a wing valve arranged at the top of said backfall, said wing valve having a length substantially equal to the width of said passage and being pivotable between an open position where it allows the pulp to be shot over said backfall to pass around said trough, and a closed position where said wing valve completely stops the flow of pulp over said backfall; a spring for holding said wing valve in one of said positions; and means for automatically periodically moving said wing valve between the open position and the closed position thereof so as to cause the pulp in said beating chamber to pass over said roll for continuous treatment between said roll and said bedplate, said means for automatically periodically moving said intercepter including a solenoid arranged outside said cover, a movable member controlled by said solenoid and rigidly secured to the pivot of said wing valve, and time switch means for automatically periodically actuating said solenoid.

8. A beating engine for paper pulp comprising, in combination, an endless trough; a bedplate arranged in said trough; a roll arranged in said trough above said bedplate; a backfall arranged in said trough adjacent to said roll; a continuous cover arranged above said roll and forming a continuous beating chamber extending from one end of said cover to the other and communicating at said other end directly with said trough, said one end of said cover and the top of said backfall being spaced from each other to define a passage for the pulp therebetween; a wing valve arranged at the top of said backfall, said wing valve having a length substantially equal to the width of said passage and being pivotable between an open position where it allows the pulp to be shot over said backfall to pass around said trough, and a closed position where said wing valve completely stops the flow of pulp over said baclifall; a spring for holding said wing valve in one of said positions; means for automatically periodically moving said wing valve between the open position and the closed position thereof so as to cause the pulp in said heating chamberto pass over said roll for continuous treatment between said roll and said bedplate, said means for automatically periodically moving said a intercepter including a solenoid arranged outside said cover -and a'f rnovable' member controlled by said solen'oid and r'igijdlysefc'ured to the pivot of said wing valve; andrneans for holding said wing valve continuously in the openpositi'on thereof when so desired.

9. A heating engine for paper pulp comprising, in combination, an'endless' trough; a bedplate arranged in s'aid'trou'gh; a rollgarranged i'n' said trough above said bedplate; abackfall arranged in said trough adjacent tosaidrol-l; a continuous c'ov'e'r arranged above said roll and forming a continuous beating chamber extending from one of said cover to the other and communieating at said'otherend directlywith said trough, said one en'dof said cover and the top of said backfall being spaced from each othertodefine a passage forthe 'p'ul' therebetwee a Wing valv'e' arranged at the top of sai bacl fall, said wingvalve having a length substandairy equal to the 'Width' of said passage and being ivotable between an openposition whcreit allows the pulp to tie-shot over said backfall to pass around said trough, and a clo ed position where said wing valve completely stops the flow of pulp over said backtall; a spring for holding said wingvalve in one of said positions; means for automaticallyperiodically moving said wing'valve' between the open position and the closed position thereof so as to cause the'pulp in said beating chamber to pass over said roll for continuous treatment between said roll and said bedplate, said means for automatic-ally periodically moving said intercepter ineluding a solenoid arranged outside said cover, time switch means for automatically periodically actuating said solenoid, and a movable member controlled by said solenoid and rigidly secured to the pivot of said wing valve; and a pivoted latching lever movable into and out of the path of said member controlled by said solenoid so as to hold said member against any return movement when said wing valve is in the open position thereof.

10. A beating engine for paper pulp comprising, in combination, an endless trough; a bedplate arranged in said trough; a roll arranged in said trough above said bedplate; a backfall arranged in said trough adjacent to said roll; a continuous cover arranged above said roll and forming a continuous beating chamber extending from one end of said cover to the other and communicating at said other end directly with said trough, said one end of said cover and the top of said backfall being spaced from each other to define a passage for the pulp therebetween; a pulp intercepter arranged at the top of said backfall, said pulp intercepter having a length substantially equal to the width of said passage and being pivotable between an open position where it allows the pulp to be shot over said backfall to pass around said trough, and a closed position where said intercepter completely stops the flow of pulp over said backfall; means for automatically periodically moving said intercepter between the open position and the closed position thereof so as to cause the pulp in said beating chamber to pass over said roll for continuous treatment between said roll and said bedplate; and a plurality of deflectors arranged on the inner face of said cover, said deflectors arresting any pulp bypassing said backfall and carried around by said roll so as to fall back on said roll and to be carried along by the same into the space between said bedplate and said roll.

11. A beating engine for paper pulp comprising, in combination, an endless trough; a bedplate arranged in said trough; a roll arranged in said trough above said bedplate; a backfall arranged in said trough adjacent to said roll; a continuous cover arranged above said roll and forming a continuous beating chamber extending from one end of said cover to the other and communicating at said other end directly with said trough, said one end of said cover and the top of said backfall being spaced from each other to define a passage for the pulp therebetween; a pulp intercepter arranged at the top of said backfall, said pulp intercepter having a length substantially equal to the width of said passage and being pivotable between an open position where it allows the pulp to be shot over said backfall to pass around said trough, and a closed position where said intercepter completely stops the flow of pulp over said backfall; means for automatically periodically moving said intercepter between the open position and the closed position thereof so as to cause the pulp in said beating chamber to pass over said roll for continuous treatment between said roll and said bedplate; and a plurality of plates arranged at progressively increasing angles to the vertical arranged on the inner face of said cover, said plates arresting any pulp bypassing said backfall and carried around by said roll so that the same meets said plates at substantially the same angle so as to fall back on said roll and to be carried along by the same into the space between said bedplate and said roll.

12. A beating engine for paper pulp comprising, in combination, an endless trough; a bedplate arranged in said trough; a roll arranged in said trough above said bedplate; a backfall arranged in said trough adjacent to said roll; a continuous cover arranged above said roll and forming a continuous beating chamber extending from one end of said cover to the other and communicating at said other end directly with said trough, said one end of said cover and the top of said backfall being spaced from each other to define a passage for the pulp therebetween; a pulp intercepter arranged at the top of said backfall, said pulp intercepter having a length substantially equal to the width of said passage and being pivotable between an open position where it allows the pulp to be shot over said backfall to pass around said trough, and a closed position where said intercepter completely stops the flow of pulp over said backfall; means for automatically periodically moving said intercepter between the open position and the closed position thereof so as to cause the pulp in said beating chamber to pass over said roll for continuous treatment between said roll and said bedplate; a plurality of plates arranged at progressively increasing angles to the vertical arranged on the inner face of said cover, said plates arresting any pulp bypassing said backfall and carried around by said roll so that the same meets said plates at substantially the same angle so as to fall back on said roll and to be carried along by the same into the space between said bedplate and said roll, said plates being movable edgewise toward and away from said roll; and screw and nut means mounted on the outside of said cover for moving said plates.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,639,917 Witham, Jr. Aug. 23, 1927 1,671,557 Tyler May 29, 1928 1,679,058 Shlick July 31, 1928 1,754,519 Kircoaf Apr. 15, 1930 1,817,749 Knoll Aug. 4, 1931 1,824,080 Haskell Sept. 22, 1931 FOREIGN PATENTS Number Country Date 144,477 Germany Sept. 25, 1903 148,027 Germany Feb. 8, 1904

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