US1121837A - Paper-pulp reducing and washing machine. - Google Patents

Description

G. 0. HOWARD.

PAPER PULP REDUCING AND WASHING MACHINE. APPLIOATION FILED BEPT.3, 1912-.

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GUY C. HOWARD, OF EVERETT, WASHINGTON.

PAl PER-PULP REDUCING.AND WASHING- MACHINE.

Specification of Letters Patent.

Application filed September a, 1912. Serial No. 718,306.

To all whom it may concern Be it known that I, GUY C. HOWARD, a citizen of the United States, residing at Everett, in the county of Snohomish and State of Washington, have invented certain new and useful Improvements in Paper- Pulp Reducing and Washing Machines, of which the following is a specification.

This invention relates to apparatus forv reducing and washing paper pulp material and, more especially, to improvements in apparatus described and illustrated in patent application Serial No. 660,423, filed November 15, 1911.

The object of my improvement is the perfecting of apparatus of this character to render the same more efiicient in operation.

The operation \performed by thedevices which constitute this invention may be in the nature of washing for the recovery of chemicals which are utilized in the art for cooking paper stock, as when making soda pulp; or it may combine washing and disintegrating operations, as in manufacture of kraft pulps, where both a mechanical comminution of the material and the cleaning of the same to recover the chemicals are required.

The invention consists in the provision of devices whereby water is both added to and\ discharged from a tube mill or washer intermediate the feed and delivery ends there- -of and-in such a manner that the general flow of the water through the mill is in a direction contrary to the travel of the material. Y r

In the accompanying drawings, Figure 1 is a view shown partly in side elevation and partly in longitudinal section of a tube mill with my invention applied thereto. Figs. 2 and 3 are transverse sections taken through 22 and 33, respectively, of

The reference numeral 5 designates a power driven rotary drum havmghollow trunnions 6 and 7 which are journaled in bearing boxes 8. The material to be treated is supplied from a hopper 6 through the trunnion 6 and is eventually delivered through a discharge opening provided in the trunnion When a mechanically efl'ected disintegrating action upon the ma- .terial treated is to be accomplished within the drum, the flatter would be supplied with balls or pebbles of suitable size.

Intermediate the length of the drum are devices wherewith liquid such as water or chemical solutions may be supplied and withdrawn therefrom. The means illustrated in Fi s. 1 and 2 for supplying water into ,the dr water elevators'comprising tubes 9', 9 and 9 which (like that described in the aforementioned patent application) are fixedly .connected to and. coiled about the drum.

An end of each of these tubes communicates by an opening 10 in the drum'shell with the interior of the same; while the other ends of the tubes are arranged to serve in their successive revolutions as scoops for dipping water from tanks 11', 11 and 11 provided below the drum. In alternate relation with the water supplyopenings 10, the drum is provided with water discharge openings 12, 12 and 12 For each of such openings is provided a" perforated plate or screen 13. Disposed preferably upon the Joutside .of

the drum and spanning said water discharge openings are belt plates 14 which are formed to provide annular chambers 15, 15 and 15 which communicate with the interior of the drum through the respective water discharge openings. In the peripheral wall of each of these chambers are provided drain holes 16 which may be regulated as totheir livered into the mill, excepting the small quantity which accompanies the material'as discharged, flows toward the head end of the mill and escapes principally through opening 12 and chamber 15"into the vessel 18'.

' From the latter, water is conducted by a pipe 20' into tank 11 from which it is returned by elevator 9 into the drumand advanced toward the head end of same. The water thus reintroduced escapes through the openings 12' and 12 into vessels 18' and 18 and that which is entrainedi'in the last named vessel is conductedby plpe 20 1nto Patented Dec. 22, 1914.

consists of a plurality ofinto the drum b ,water thus supplied to the, drum flows through openings 12 and 12 into vessels 18 and 18 The major portion of the water accordingly travels by a. succession of steps from .tank 11, near the discharge end of'the drum to the vessel 18 which is catedwithin a slrort distance of the .drum end through which material is fed to the mill.

By adjusting the sizes of, the drain holes- 16 by bushing the sameit is obvious that the flow of water-between any of the water inlets and the water-discharge may be regulated to vary the character of the work performed. The amount of water supplied the various elevators isbest controlled by individually regulating the heights of water within the respective tanks.

' 11, .11 and 11 to afford predetermined therefrom if sufliciently concentrated with a minimum amounts of water being transmitted through the respective elevators. An advantageous manner of regulating the height of water in the tanks is through the agency of a float 21. within each tank and which is operatively valveprovided in the associated pipe, A supplementary water supply pipe, as at 19, may be utilized at any point throughout the system as, for example, into the tank 11.

23 represents a discharge {30111166131011 for theterminal tank 18 although valved outlets, as 23', may be employed for withdrawing the water from the system intermediate its length for the recovery of chemicals Among the advantages of the present 'invention, is the provision of apparatus whereby a tube mill, or washer, may be operated of water and with a corresponding economy in the recovery of chemicals'em loyed in the operation of the same and wh ch is principally due to the, provision of means wherebylthe. water is intermittently used in a .progressive='travel between the discharge and feed ends of the mill. Furthermore, by the peculiar arrangement and disposition of the elements of the invention, a mill is in effect divided'into a series of zones in which ensue'cii'culatory water courses and milL liquors of various densities being extracted or a single strong liquidniay be withdrawn from near the feed end of the mill and resulting in the.mate-- rial being at its, discharge from the remote end in a practically clean state. The oper- I ation is continuous and is performed while the pulp is adjusted and mind through the rotationof the mill. 4

WhileI have described a paper pulp mill or washer, it is to be understood that the invention is not confined tosuch' applications as it may be efl'ectively used in analogous operations as for example-imthe extractionof soluble saccharine matter from 1. In a mill of the character described, a

rotatable drum having an interior chamber provided with means for feeding material thereinto atone end, and a discharge therefor at the opposite end, a device for supplying liquid to said chamber in proximity to said discharge end of the drum, means for withdrawing said liquid from the chamber intermediate said supply device and the feed end ofthe drum, means wherein said withdrawn liquid is caused to flow exteriorly of the drum towardsaidjed end of the drum, and -a second supply device adapted to re-in'troduce said liquid intermediate said withdrawing means and the feed end of the mill.

2. In a mill of the character described, a rotatable drum having an interior chamber provided with feed and discharge openings for material at opposite ends, a plurality of devices for supplying liquid to said chamber lntermediate said ends, .means interposed between said supply devices for discharging said llqu d, and means exterior of said drumv secured to said drum afiprding an annular chamber about the drum, a screen rigidly connected to said drum having perforations communicatively connecting the interior of the drum with said chamber, and an outlet for said chamber.

4. The combination ofa rotatable drum provided with an opening for the feeding of material into one end a'ndan opening for the delivery of the same from the opposite end, said drum being provided with openings for the discharge of liquid intermediate the aforesaid. openings, means .for receiving the liquid thus discharged, and means for returning such liquid into the drum. 7 i

5. A rotatable drum provided with openings at its opposite ends through which material to be treated is res ectively fed into and discharged from the rum, in combination with means whereby a liquid may ,be

introducedinto the drum in proximity to the discharge opening thereofand then be caused to travel in a direction opposite to liquid discharge openings provided intermediate the aforesaid openings, of means whereby the liquid escaping from the various liquid discharge openings, is returned progressively into the drum and delivered in proximity to the respective liquid discharge openlngs.

7. The combination with a rotatable drum provided with openings at its opposite ends for the supply and withdrawal of material to and from the drum, and having a plurality of openings for the discharge of liquid intermediate the ends of the drum, of vessels for receiving the liquid discharged from the respective water-discharge openings, and a tank connected with one of the aforesaid tanks, and means whereby the liquid is conveyed from such supplementary tank into the interior of the drum and thence be returned through the liquid discharge openings to said vessels. I

8. In a mill of the class described, a rotatable drum having an interior chamber, a plate secured to and revoluble with the drum a ifording a chamber exteriorly of the drum, a screen interposed between said chambers, an outlet for-said exterior chamber, a receptacle for receiving the matter discharged from said outlet; and means whereby said' discharged matter may be reintroduced within the mill.

9. In a mill of the class described, a rotatable drum having an interior chamber provided with a feed opening at one end and a discharge opening at the other, a plate secured to and revoluble with the drum for affording a chamber exteriorly of the drum, a screen interposed between said chamber to permit the passage of fluids, an outlet for said exterior chamber, a receptacle for receiving said fluids from said outlet wherein said fluids are conveyed longitudinally of chamber therein wherein the material under treatment is introduced at one end of the mill and discharged at the opposite end, of'

means for introducing an auxiliary supply of water within said chamber and causing said water to flow axially of the mill in a direction opposite to the course of said material,

i 11. In a mill of the class described Wherein the material to be treated is caused to progress continuously through the mill from one end to the other, a plurality of devices for supplying Water to the mill, a plurality of means whereby said water is discharged from the mill, said supply devices and discharge means being alternately positioned longitudinally of the mill, and a receptacle exterior of the mill for receiving the water from said discharge means and delivering same to the respective supply device. v

12. In a mill of the class described, Wherein the material to be treated is caused to progress continuously through the mill from end to end, of means whereby water is alternately introduced and Withdrawn from said chamber aplural number of times, the general course of said water being contrary to the direction of travel of said material.

Signed at Everett, Washington, this 26 day of August, 1912.

GUY O. HOWVARD. Witnesses:

PIERRE BARNES, J. V. WOODWARD.

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