US1421364A - Pulp-thickening machine - Google Patents

Description

C. H. ALLEN.

PULP THICKENING MACHINE.

APPLICATION FILED MAY 28, 1920.

13% 1 ,364. Patented July 4, 1922.

VENT 17E. mxz M,

i MAINE.

CARLTON H. ALLEN, OF MILLINOCKET,

NORTHERN PAPER COMPANY, OF

Application filed May 28,

To all whom it may concern:

Be it known that I, 'CARUroN H. ALLEN, a citizen of the United States, residingat Millinocket, in the county State of Maine, have invented certain Improvements in a-Pulp=Thickening Machine, of which the following description, in cona specification, like reference characters on the drawings indicating like parts in the several figures.

This invention relates to a thickener or washer for .pulp. According to the usual processes of making pulp an excessive quantity of water is used for the purpose of facilitating the screening operation and consequently it is necessary later to thicken the pulp before it goes to the paper machine. For instance, a normalconsistency for the pulp immediately after the screening operation is approximately three-tenths of one per cent, while it is desirable that this consistency be increased to from two to five per cent before the pulp is delivered to the paper machine. This may moving part of the water in which the solid material is suspended and pulp thickeners operating on this principle are known at the present time.

It is the chief object of the present invention to devise :an apparatus of this character which will I have a greater capacity for a given area of screening or filtering surface than similar apparatus heretofore used, which will produce more uniform results, which can be economically manufactured, in which repairs ,can readily be made, and which generally shall be an improvement on apparatus of this character heretofore proposed.

The nature of the invention will be readily understood from the following description whenread in connection with the accompanying drawings and the novel features will be particularly pointed out in the appended claims.

Referring now to the drawings,

Figure 1 is a front elevation of a pulp thickening machine embodying the-invention. in the form. at present preferred Fig. 2 is a transverse cross sectional View of the machine shown in Fig. 1 showing it in connection with certain apparatus for su plying pulp thereto; and

1g. 3 is a vertical cross sectional View at Specification of Letters Patent.

of Penobscot and sectional outline, the nection with the accompanying drawings, is

be done by re-- I they MAINE, ASSIG-NOR 0F ONE-HALF TO GREAT MILLINOCKET, IEAINE, A CORPORATION OF PULP-THICKENING- MACHINE.

Patented July 4%, 1922. 1920. Serial n. 384,942.

one end of the machine, the section being taken substantially on the line 3-3, Fig. 2. The apparatus shown comprises a rotary drum or filter designated in general at 2.

This drum is mounted to revolve about a horizontal axis and is polygonal in cross particular form shown having sixteenv faces. The drum may be built in any suitable manner but preferably it comprises a series of plates or ribs 3, approximately annular in shape, spaced apart by, and interlocked or cast with, a series of longitudinally extending bars 4. The plates 3 are grooved to support a series of small tubes or rods 5 which extend the entire length of the drum and support a screen or wire cloth 6 that forms the filtering surface. At each end the drum is provided with an annular member" 7, Fig. 3, secured rigidly thereto and forming a part thereof, and each of these members is bolted or riveted to the projecting flange of a spur gear 8.

The filtering drum is supported in a casing comprising a lower or base portion 10 and an upper portion 12 which is hinged to the lower portion at 14. Normally these two parts occupy the, positions in which are shown in F ig. 2, a tight joint be ing provided between them by a suitable gasket. This casing is provided with bearlng members 15 at its opposite ends which support sleeve-like extensions 16, Fig. 3, projecting from the hubs of the respective spur gears 8. The upper portion 12 of the casing is provided with bearings which support a shaft 17 having two pinions 18-18 thereon which mesh with the respective spur gears 8 at the opposite ends of the drum and drive the drum, the shaft itself being driven by a .belt connection to a pulley 19 fast thereon.

The pulp to be thickened is conducted to a head-box 2 which is connected by a pipe 21 to the lower part 10 of the casing, the flow of pulp to the casing being controlled by a valve 22. The head-box is higher than the casing and the valve 22 is so ad'usted that the casing is substantially fille with pulp at all times during the normal operation of the apparatus, so that the drum 2is completely submerged. As shown in Fig. 2. the casing is provided with a delivery or discharge oening 24 at one side of thedrum, and t e portion of the casing immediately below this opening consists of a;

plate 25fleiitendingthe e ilengt of, he

cylinder and having an iniifi Surface curyed concentrically: with the @This? plate is adj ust'ably secured. at its ends thes'tationary parts ofthe casinglby bolts 26-26 Pa i g h e h k s t na d Po i n v of {the plate, y 1 The clearance between the roairing en s ems r a s-lit e, p t i adjusted thattheflow of the l htkened p pgt fough l i eherg e n:

ing s prevented A similar. construction is 1 provided, aboye the discharge; "opening and comprises a plate secured b" b useass in the construction just descrih ed. i {It should be noted thatltheinne! Surfaces 0 e c ed Pla es a t dr2 J QfQ uch dimensions v ci'rcgulinfe'rentially .of"th e drum that they cover, {at all times, at least two, of the projecting edges 29 that separate the adjacent fiat faces of the drum. In other words, they each lcoyer more than one flat falcejofthe drum;

: When he apparatusj isfin casing is filled with pulpor fstuifhjtheen ir dr m ngfwbm e ii nd he m is driven very slowly in .the direction indicated by the arrow, Fig. 2. A large proportion of .thewaterdrains' through the screen and runs out the opposite ends of'the drum, which are open, into the discharge 30 30. This leaves aflaye-r ofthickslushypulp on thesurface ofthe dr l ing-which seals. the

space between? the plate ilfifand the ect; ing edges29 ofthedrum. 7 As the drum ro.- tat'es slowly past ,the discharge opening; 24 the; thickened pulp. held} in the sector-like space ,lformed between one of the fiat .faces of the d r im vand the inner-face oftheplate 25 is discharged through the ope-nin 2,4,but an rush of the thin stock or unt iokened. pu p throughwthis'opening is prevented by the presence of the layer pulp in the thin clearance pace betweennthe edges 29 ofthe drumv and the inner curved surface oflthe drum than is the lower plate 25 h In this connectionit may ,be pointed out that the machine can be operatedto thicken pulp when the drum is rotated ineither direc-j tion and that it is not necessary to have the drum entirely submerged, although the apparatus operates more rapidly, or has a greater capacity, other things being equal, when it is submerged,

the opening .24 1 substantially; continuously 1 and is of :a compara iv ly lun f mic s str ency; L; Furthermore,=.-this consistency can he ar edl y -Yeryi atm h e -s Pulp i lt box; QO onhy changingthespeed of rotation.

Us rially -the speed of rotation: is very slow ay:'fo l exampleggttbm e 7 e i ns. Per mini be i i tli eaxlugii hei are ru l ta ion liygp pe 22% led threng lt eih l ew sh u tionedl; 'withi'n the drum. opposite the I disharge pen ngfi -g i t er e ldf ma oles are;drumiatheliorwe d side of this pipe so that} theyld ,2 eet. a spray of clean -:water against. theinl et r f. ln zorden. to p 'event; the unthickened. pulp from imagin at the ends; of the drums a novel packlng preferably is; used; ,As shown Fig- 3; t e nd o thel a' q i 'i Pr ed witha circular lip #33 surroundinglthedrum to: i receive packing 34,1 and a plate :35. is .secured touthe outer edge of; the lip 33: by screws ,or halts to hold the packing in place. Th s? Pa ng -p f i' ysts f end:

leglrubber ,tube'finflated s uat i exerts a yielding pressure against the outer surface of-the drummember'Z and: maintains atight jointhetyveenlthe endsof the drum and the casing."v Y 1 .lflwl apparatus; substantially. the entire screening or filt ering 7 surface of the drum ,is utilized at an; times during. {the normal" operation of "that, shite;

'themachine. Due tojthisr-i'fact and to the a further fact that {the apparatus is operated undena certain hydraulic headyfitperforms thepulp thickeninguoperation much more rapidly than dotheprior machines designed for this Work. a Furthermore, the machine produces more uniform results; Q That :is,

thetthickened pulp'fdischar qg'etil from fthe inachine is of a' moremniform consistency than isthat produced by the prior. machines with whichmI am familiar. ,u Theifp-articular machine shown is designednafor. washing or thickening sulphite stock butpa machinepf thelsame character is adapted :for use with ground wood pulp; although l, prefer to use a drum hav-inga greaterj.11umber-of,flat faces foroperating on ground wood ulp. It will be understood thatwhile I have herein referred toz the drum as of polygonal shape cross section, since this construction is convenient to] manufactureland operates satisfactorilyythat a true polygonal shape not absolutely essential to producing the resultsabove described, butthat the faces, of theidrum. may be somewhat convex or concave if desired. y Y 1 v It will also be understood that while I have herein shown and describedv the best er'n bodimentof the invention oi h ch 1 am at which said drum may be ill present aware, this embodiment may be modified in many particulars without departing from the spirit or scope of this invention.

What is claimed as new is 1. A pul thickening apparatus compris ing, in com ination, a lterlng drum, means for driving said drum, andya reservoir 1-n submerged in pulp, opening at one side discharge of thickened said reservoir having an of said drum for the pulp.

2; A pulpthickening apparatus vcomprls ing, in combination, a filtering drum, means for driving said drum, a reservoir in which said drum-may submerged in pulp, said reservoir having an opening at one side of said drum through which the thickened pulp is discharged, and means for preventing the flow of unthic'ke'ned plup from'said reservoir-throu h said opening.

3. A pu p) thickening apparatus, comprising, in com ination, a filtering drum, means for driving said drum, 'a'casi'ng in which said dru'mis mounted, said casing torming a reservoir for unthickened pulp and having an opening therein at one side of said drum for the discharge of thickened pulp, said openingbeing below the normal level of the pulp in said casing, and means for prevent mg the flow of unthickened pulp'through said discharge opening.

4. A pulp thickening apparatus comprising, in combination, for-driving said drum, a casing in which saididrum is mounted, said casing having a at one side of said drum,

discharge opening and stationary parts at opposite sides of said opening fitting close to the peripheral surface of the drum, said casing forming a reservoir in which the drum may comsubmerged in pulp.

ing, in combination, a rotary filtering drum of polygonal cross section, a casingtherefor forming a reservoir for' unthickened pulp and having an opening at one 'sideof the drum for the discharge of thickened pulp,

said openingbeing below the normallevel of the pulp in said casing, said drum being separated from the parts of said casing at opposite sides of-sald opening by a small 0 earance space normally sealed by a layer of stock on the surface of the drum, and

means for drivin said drum,

6. A pulp thic ening apparatus corn" rising; in combination, a filtering rum mounted to rotate about a. substantially horizontal axis, means for drivingsaid drum, a casing in which said drum is mounted,isaid casin forming a reservoir for pulp to be thickened and having a horizontal opening therem at one side of and drum for the discharge of the thickened pulp, said P ing eing below the normal level of the said opening.

' the lower.

a filtering drum, ineans pulp thickening apparatus compr sunthickened pulp in the casing, and means cooperating with said drum to prevent the direct flow of unthickened pulp through Z. A pulp thickening apparatus comprising, in combination, a filtering drum vnicninted to rotate about a substantially horizontally axis, means for driving said drum, a casing in which said drum is mounted, said casing forming a reservoir for pulp to he thickened and having a horizontal opening thereinLat one side of said drum for the discharge of the thickened pulp,said opening being below the normal level of the Ila-- thickened pulp in the casing, and a part at side of said opening having an inner curved surface extend'in for a substantial distance circurn'ferentially of said drum and separated from said drum by a narrow clearance space, whereby-said part cooperates with the drum to prevent the direct flow of unthickened pulp through said discharge opening. 8. A pulp thickening apparatus comprising, in combination, aifilteringf drum mountv ed to rotate about-a substantially horizontal axis, means for dri ing said drum, a casing in which said drum is mounted, said casing forming a reservoir for pulp to be thickened and having a horizontal opening therein at one side of said drum for the discharge of the thickened pulp, the normal level of said opening being below thev nnthickened :pulp' in the casing, a part at the lower side of said opening having an inner curved surface extending for a substantial distance oil-1minferentially of said drum and separatedfi om said drum .fby anarrow clearance space,-

whereby said part cooperates withithe to prevent the" direct how of unthickened pulp through said discharge opening, and means whereby saidpart may he'adju'sted-to vary the width of said clearance space. 9 A-pul thickening apparatus compris ing, in com ination, a filtering: drum mount-v ed to rotate about a substantially horizontal axis, me'ansfor' driving said drum, a casing in which said drum is mounted, said casing forming a reservoir forpulpto be thickened and having a horizontal opening therein at one sideof said drum for the discharge of the thickened pulp, the normal level of the unthickenedpulp in the-casing, and parts at the upper and lower sides of said opening having innervcurved surfaces extending for a substantial distance along the circumference of said drum and separated from the peripheral surface of said drum' 'by a. narrow clearance space, whereby said parts cooperatewiththe rumed to rotate about a substantially horizontal said opening being below axis, said drum being of polygonal cross section, a casing in which said drum is mounted, said casing being rovided with a discharge opening at one si e of the drum and having surfaces at the upper and lower sides of said opening lying closely adjacent to the peripheral surface of the drum, the space between said drum and said surfaces being normally sealed by a layer of stock on the surface of the drum, and means for driving said drum.

11. A pulp thickening apparatus compris ing, in combination, a rotary filtering drum of polygonal cross section, a casing in which said drum is mounted, said casing being pro vided with a dischar e opening at one side of the drum, and a p ate at one side of said discharge opening having a surface substantially concentric with the axis of the drum and positioned close to the edges separating adjacent faces of the drum and of sufiicient dimension circumferentially of the drum to overlie at least two of said edges simultaneously.

12. A pulp thickening apparatus comprising, in combination, a rotary filtering drum, a casing in which said drum is mounted, said casing comprising upper and lower portions hinged together, a shaft mounted on said upper portion, and driving connections between said shaft and said drum.

13. A pulp thickening apparatus comprising, in combination, a filtering drum mounted to rotate about a substantially horizontal axis, a casing in which said drum is mounted, said casing forming a reservoir in which said drum may be submerged in unthickened pulp, means for rotating said drum,

vent the direct flow of unthickened pulp through said opening.

14:. A pulp thickenlng apparatus comprising, in combination, a filtering drum of polygonal cross section, means supporting said drum for rotation about a horizontal axis, a casing in which said drum is mounted, said casing forming a reservoir in which said drum may be submerged in unthickened pulp, means for rotating said drum, said casing having a horizontal opening therein at one side of said drum for the discharge of the thickened pulp, and parts at the upper and lower edges of said opening cooperating with said drum to prevent the direct flow of unthickened pulp through said opening.

15. A pulp thickening apparatus compris-.

ing, in combination, an open ended filtering drum, a gear at each end of said drum and secured thereto substantially at the periphcry of the drum, a shaft for each of said gears, bearings supporting said shafts at opposite ends of the drum for rotation about a substantially horizontal axis, a driving shaft, and inions carried by said driving shaft for driving said gears.

In testimony whereof I name to this specification.

' CARLTON H. ALLEN.

have signed my

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