US1693560A - Paper-stock strainer - Google Patents

Description

Nov. 27, 1928. 1,693,560

J. D. HASKELL. ET AL PAPER STOCK STRAINER Filed Dec. 1924 2 Sheets-Sheet l Nov. 27, 1928. 1,693,560

J. D. HASKELL ET AL PAPER STOCK STRAINER Filed Dec. 1924 2 Sheets-Sheet 2 W WW Y 2 Patented Nov. 27, 1928;

ET I 3' JOHN D. HASKELL AND MORTIMER R. RUST, OF FULTON, NEW YORK, ASSIGNORS TO DILTS MACHINE WORKS INCORPORATED, OF FULTON, NEVT YORK, A CORPORA- PAPER-STOCK S'IRAI'NER.

Application filed December 8, 1924. Serial No. 754,626.

This invention relates to a paper stock strainer, technically known as a cylinder washer of the siphon-type for-beating engines involving the use of a vat or tub in 5 which'the mixture of stock and water is circulated by the rotation of the beater roll or any other suitable circulating means for agitating and reducing the stock to the required consistency for manufacturing into paper.

During this agitation and circulation a considerable quantity of dirt and other impurities are liberated from the stock'and held in more or less suspension in the water and one of the main objects of the present invention is to provide a more eficient and eXpedi-- tious means for removing these impurities while the fresh, pure water is being added to the mass in circulation and thereby to accelcrate the washing or cleansing of the stock from such dirt or other impurities.

In other words we have sought to carry out this object bymeans of a rotary screen drum supported in such manner that agreater or less area of its screened perimeter will project into the vat in the path of movement of the circulating stock to be automatically rotated thereby for successively presenting different portions of the screen in said path and at the same time to'cause the dirty or impure water passing through and to the interior of the screen to be automatically with drawn, preferably by siphon action, as it accumulates therein, while fresh water is being supplied to the vat to replace the impure water as the latter is withdrawn.

Another object is to utilize the flow of fresh water to the vat or tub for starting or assisting the siphoning action. f j

A further object is to provide 'means whereby the conduits through which the impure water is withdrawn may be easily and quickly cleansed when necessary or desirable.

Other objects and uses regulating to specific parts of the washing apparatus will be brought out in the followingjdescription.

In the drawings: V Figure 1 isa top plan of a portion of a tub or vat in which the stock is circulated together with the rotary screen and a movable support therefor in operative position.

Figure ,2 is a side elevation of the parts shown in Figure 1 except that a portion of the vat or tub is broken away to show the portion of the rotary screen projecting therein. a

Figure 3 is an enlarged, longitudinal, vertical, sectional VlGW, partly broken away, of portions of the vat and screen and the adjacent portions of the movable supporting frame for the screen together with the means for inducing the siphoning action of the impure water from within the screen.

Figure 4 is an enlarged detailed sectional view of a portion of one end of the rotary screen showing the manner of fastening the peripheral screen to the end heads and connecting bars. J

In order that the invention may be more clearly understood we have shown a portion of a vat or tub -'1 as provided with a lengthwise trough or channel -2 through which the mixture of water and stock is adapted to be circulated in the direction in dicated by arrow -a by any suitable circulating means as, for example, by the roll of a beater engine, not shown, whereby the stock is agitated and reduced more or less to the desired consistency for manufacture into paper.

A screen drum 3 which, for convenience of description may be termed a cylinder, is rotatably mounted upon a suitable support-- ing frame to revolve about a horizontal axis transversely of the channel 2'and extends axially a distance corresponding approximately to the width of said channel with which it is registered and into which the lower sideof the cylinder is adapted to project when adjusted for use.

The frame --4 upon which the screen cylinder 3' is mounted is adjustable ver tically for-moving the cylinder into and out of the vat and also for varying the depth of immersion of the lower side thereof into the circulating stock in the channel --2, said frame consisting in this instance of opposite end bars '5 extending diametrically across corresponding ends of the cylinder 3 and beyond diametrically opposite sides thereof and having one end thereof pivoted while the other ends of the bars 5 are connected to each other by cross bar to which is connected a hoisting cable 8- adapted to be connected to any suit-able hoisting mechanism, not shown, whereby the frame 4 with the screen cylinder 3 thereon may be rocked about the axis of the bearings 3- to vary the depth of immersion of the lower side of the screen in the liquid stock or by the same hoisting means the screen cylinder may be lifted entirely out of the vat if desired.

The screen cylinder 3 comprises a pair of similar, coaxial end heads 9- arranged in axially spaced relation concentric with the axis of revolution and provided with central hubs 10- which are j ournalled by means of anti-friction roller bearings 1l upon relatively stationary journal bearings -12 on the central portions of the arms 5 of the frame k so that the screen cylinder +3,as a whole, may revolve freely upon said frame.

' These end heads 9- are provided with a plurality of similar openings 13 of relatively large area arranged in uniformly spaced relation, circumferentially about the axis of rotation and are covered by screened panels or discs 1l which are preferably secured to the inner faces of the heads by screws or equivalent fastenin means so as to form unitary parts of said heads.

The perimeters of the heads 9 are similarly serrated, the serrations being rela tively large or elongated circumferentially to form a series of teeth -1'" and depressions 16, the teeth -15- of each head being arranged in uniformly spaced relation circumferentially and in axial alignment with the teeth of the other head. The edges of the teeth, facing in a direction opposite the direction of rotation of the c linder -3, are abruptly inclined slight angle to the radial lines passing through the points of the teeth at the side of said radial lines opposite the direction of rotation and are tangential to circles of relatively small radlus while the other edges of the teeth are inclined.

at a much greater angle to said radial lines and are, therefore, tangential to circles of relatively large radius, the joining portions of the long edge of each tooth with the shorter edges of the next adjacent teeth being rounded at.-16-- to form the depressions previously mentioned and for a purpose hereinafter described in connection with the peripheral screen.

The points of corresponding teeth of the opposite heads -9- are connected by rigid bars 17 which are secured to the heads by screws 17 or equivalent fastening means so that the outer faces of the bars are substantially coincident with the corresponding points of the teeth.

A peripheral screen -18 1s wrapped tightly around and against the peripheral edges of the teeth 15- and are rigidly secured thereto by screws or otherwise to form a unitary part thereof, and to conform to the circumferential outlineof the periphcries of the heads 9-.

That is, the ends of the screen 18 follow the peripheral contours of the heads -9 and are supportedintermediate the heads by the lengthwise bars -17- to which they are secured by clamping bars 19- which, in turn, are secured to the bars 17 by screws -20 or equivalent fastening means. 1 7

It is now clear that when the peripheral I screen .18. is wrapped around the peripheral edges of the heads 9 and bars 17 so as to follow the contour of the teeth -l5- it will form a circumferentially corrugated perimeter, and the portions thereof which arefastened to the abrupt edges of the teeth will constitute impact faces 21-- which when projected into the path of movement of the circulating stock in the vat -1 receive the impact of the moving stoclr as the latter travels through the channel 2 thereby causing automatic rotation of the screen cylinder. 7

The corrugating of the screen perimetric of the drum in the manner described produces a series of parallel lengthwise ribs in uni.- formly spaced relation circumferentially, in which the opposite faces of each rib are dis posed at different angles r latively to a radial plane passing through the center of said rib and those having the lesser angle will face in the same direction circumferentially to form the impact faces previously,described.

The frame a is hung in such manner upon the tub or vat -1 as to swing to a substantial horizontal position close to the all of which greatly increases the washing efficiency of the apparatus and also greatly expedites the washing operationand enables the fresh water to take the place of the impure water practically as fast as it is removed by the siphon action and therefore the stock is practically clean after leaving the'washing cylinder. v

It will, of course, be understood that any number of these cylinders may be employed to ope "ate in succession along the line of tally through central openings inthe end v i flz'p'hon action. 7 A siphon pipe -22 is extended horizonheads 9 of the cylinder 3 and also through aligned openings in the bearings 12 co-axial with the axis of revolution of said cylinder, one end of the siphon pipe 22 being closed by a cap nut 23 while the otherendis connected by a T Coupling 24 to 'a radially extending branch pipe 25, the outer end of the T coupling '24- being normally closed bya plug 26 which maybe removed when necessary to allow a suitable cleaning tool to be passed entirely 7 connected toa T coupling -2 turn, 1s p1votally connected by a union vthrough the pipe 22 for cleaning purposes. I Q g V The rear end of the branch pipe 25 is which, in

-28- and a nipple 28 to a d-way coupling 29--, the axis of the coupling 28- and nipples 28 being co-axia-l with the axis of the pivots 6 of the screensupporting frame 4 so as to allow said frame with the screen cylinder thereon to rock vertically Without straining any of theconnecting joints of the siphon system.

The portionof the horizontal siphon pipe 22 within the screen cylinder 3 is provided with one or more T couplings 30 having a radial branch siphon pipe 31 extending downwardly to a level near the lower side of the screen cylinder 3 but in spaced relation thereto and therefore some distance below the level of the liquid stock in the vat --1 when the frame 4 with the screen thereon is adjusted for use so that any suitable degree of suction temporarily created within the coupling 29 and siphon pipes -25 22 and 31 will induce an up-fiow of the dirty water within the screen cylinder 8 through the pipes 31, 22- and 25- respectively and thence into the coupling 29 where it may be discharged to a waste pipe or other place of deposit outside of the vat -l. q

A' delivery pipe 32 is connected to the lower side of the coupling 29 to extend downwardly therefrom at the exterior of the vat and adapted to be connectedto any suitable waste pipe, not shown;

In the use of this siphon principle of eduction of the dirty water from the interior of the screen, it is, of course, necessary, particularly in starting the siphoning action, to withdraw air from the siphon pipes and in- I asmuch as it is also necessary to supply fresh water to the vat to replace the dirty water I as it is withdrawn the flow of the fresh water to the vat through suitable pipes is utilized for that purpose.

1 That is, the water i from any available source of supply is conducted througha pipe 1 33 to one end of any suitable air eductor or exhauster 34- having its other end provided with a discharge pipe 35- discharging into the vat, the intermediate portion of said eductor being connected by an air pipe 36 to the upper side of the coupling 29 so that the fresh water under pressure delivered through the eductor will withdraw the air from the siphon pipes 25-, 22' and 3land thereby induce the flow of water into said siphon pipes and thence out through the discharge pipe 32- whereupon the flow of the dirty water from the interior of the screen will continue under the well-known siphonic action. 7 r

The pipe r36'is provided with a valve 37- for controlling the suction in the siphon system without in any way affecting the free flow of the fresh waterthrough the pipes 33 and 35 to the vat -1. s

The water supplyipipe 33 is also pro by the upward, rocking movement of its supporting frame 4:-.

I Operation.

During the circulation of the liquid stock in the vat 1 along the channel -2 the frame 4 with the screen cylinder thereon 'is lowered so that the major portion of the lower half of the screen will be immersed in said stock with its impact faces 21 opposed to the direction of flow of said stock which, in turn, causes a rotary motion of the screen cylinder 3-- in the direction indicated by'arrow g Figure 2- thereby successively presenting the impact faces to the flowing stock and causing a self-cleansing of the peripheral screen 18 against clogging. I

This rotation of the screen cylinder in the liquidstock also causes the stock to be dis tributed more or less evenly over the screens 18 and 14 and thereby causes a thorough washing of the same from dirt and other impurities and enables the dirty water to pass through the screens into the interior of the cylinder where it is removed by suction through the pipes 31-, -22, and -25- and discharged to the exterior of the tank through the pipe 32.

justed to allow the air to be withdrawn -from the suction pipes of the siphon system until the outflow of the dirty water through said pipes begins, whereupon the valve 37- is adjusted to prevent further suction of the air in the siphon system.

After these adjustments have been made the siphoning of the dirty water from the interior of the screen and the supply of fresh Water to the vat 1 to replace the dirty Water which is removed continues automatically for an indefinite period of time without any further attention on the part of the operator.

What we claim is i In a paper stoc; strainer, a vat having a channel through which the stock is caused to move in one direction, a frame hingedly mounted on the vat to swing vertically about a horizontal axis, a screen drum journaied on the frame to rotate about an axis parallel with and some distance from the axis of movement of said frame, said drum having its lower side immersed in and actuated by the flowing stock, a siphon pipe extending frame, an air exhauster connected to one of the siphon pipes, and means for passing water through the exhauster and into the Vattor exhausting an from the siphon pipes suthcient to start the siphoning of dirty water fromthe interior of the drum and for supplying fresh water to the interior of the vat. e

In witness whereof we have hereunto set our hands this first day of December, 192 i,

JOHN 1). HA 'KELL. Monininn a. Rust.

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