US1225086A - Automatic means for regulating pulp-stock. - Google Patents

Description

T. WARNER.

AUTOMATIC MEANS FOR REGULATING PULP STOCK.

APPLICATION FILED MAY 16. ms.

L fifigfie g Patented May 8,1917.

2 SHEETS-SHEET 1.

WFZSZWZ BY j04 ATTORNEY T. WARNER. AUTOMATIC MEANS FOR REGULATING PULP STOCK. APPLICATION HLED MAY 1a. 1916.

1 2%5 Q786r, Patent-ed vMay 8, 191.7.

2 SHEETS-SHEET 2.

INVENTOR \fl/fl/ fiwwwv A TTUR/VEY WITNESS w Q Parana caries.

THOMAS WARNER, OF OREGON CITY, OREGON.

AUTOMATIC MEANS FOR REGULATING PULP-STOCK.

Specification of Letters Patent.

Patented May 8, 121%.

Application filed May 16, 1916. Serial No. 97,795.

To alt/( 71.0111 it may concern Be it known that l. THOMAS WARNER, a citizen of the United States, residing at Oregon City. in the county of Clackamas and State of Oregon, have invented certain new and useful Improvements in Automatic ,Means for Regulating Pulp-Stock, of which the following is a specification.

This invention relates to improvements in pulp stock or stuff regulators whereby the consistency or density of the stock is keptuniform, and while 1 have described an apparatus which is adapted to insure an even flow of uniform stock to a paper machine so that a paper varying but slightly in weight and texture may be produced, the utility of the device has a much wider scope and can be used to equalize or control the density of the pulp as it comes from the pulp mill or the sulfitc mill,,or from the mixing tanks where the tank system is in use. In the application of the various types of stuff regulators to a paper machine, the efforts of inventors have been mainly directed toward an automatic stuff gate control in the machine stufi box, regulatingby means of an adjustable gate or slide the amount of stock that issues from the box. My device, however, relates more particularly to obtaining a uniform stock before it reaches the machine stuff box. rather than an apparatus tocontrol the flow of the stuff from the box to the machine-it does not attempt to regulate the fiow so much as the consistency of the stock itself.

Referring to the drawings:

F igure 1 is a side elevation of my equalizer showing the agitator tank 1 in section;

Fig. 2 is also a side elevation at right angles to Fig 1, and showing details of the driving mechanism; v

Fig. 2-1 is plan viewand Fig. 1 shows in detail the inechanislii operating the slide 30 in water control box 20:

Fig. is top view of sliding spool 12, showing split collar 13.

In describing the operation of my apparatus 1 have assumed that it is to be used in controlling the consistency of the pulp stock delivered to a paper machine. 1 place the tank 1, Figs. 1 and 2, between the stuff chest and the machine stuff box. Preferably it is situated in the machine room with its overflow at an elevation higher than the machine slut? box. so that the stock will flow by gravity from the equalizer tank to the stud box.

The stock is pumped from the stuff chest to the bottom of the equalizer tank through pipe 26 and water is admitted at the same time through pipe 24, the mingled mass of pulp and water striking a baffle plate 29 that prevents the stock from spurting up into the middle of thetank and tends tospread the flow of stock evenly on the bottom of the tank. As the pulp rises in the tank it engages the agitator arms 4 and the paddle 2. This paddle is hinged at 25 on the arm 34, which is attached to shaft 5. Its upper end is attached by cable 6 to bell crank 7 mounted on arm 35, which, like arm M, is firmly affixed to shaft 5. A spring 19 tends to push the upper end of paddle 2 away from arm 34. The cable passes around a sheave 33 at outer end of arm Rods and angle crank could of course be substituted for cable (3, but best results have been obtained with a cable as described. Attached to bell crank 7, Figs. 4 and 5, are jointed rods, 8

and 9, extending upward vertically and parallel with shaft 55, passing through guides 10 and 11. On the top of rod 9 is a socket and ball 16, which latter engages the underside of spool 12. A split collar 13 fits a groove in spool 12 and is attached to a lever 1 1, supported by fulcrum block 31 and arm 15. At its outerend is attached an arm 21, to which is affixed a vertical slide 30, dividing water box 20 into two sections. This water box.2() has its intake 22 and an outlet 23 on one side of the slide 30 and a bottom outlet 24 on the other side. Outlet 24, Fig. 2, connects with the bottom of tank 1 as shown, just at the stock inlet. Outlet 23 runs to the 'pit under the wire of the paper machine.

Both pipes 22 and 23 are provided with valves so that the flow through each may be regulated. Power is applied by means of the bevel gears 17 and 18, rotating the shaft 5 about seven revolutions per minute. Agitator arms 4, paddle 2, arms 34 and 35, spring 19, rods 8 and 9, all swing around with the shaft 5. Spool 12 does not rotate, but is free to move vertically up and down on the central shaft 5. The apparatus is so adjusted that when there is but slight pressure against the bottom end of paddle 2, the

spring 19 will hold it out to its further extension; bell crank 7 and arms 8 and 9 will be held firmly in place so that the spool 12 is up as high asit will go and the slide 30 will be at its lowest position, closing up entirely the opening 32 between the two see- 20 stock isheavier thandesired, of

" to bring the stock to 35 tendto overcome the v 45 ency and needs tions of water box 20,-and thus preventing:

any. Water from flowing through pipe 24. Water, is then flowing into water box 20 and out through pipe 23, the

- flow being'regulated to keep the boxnearly full.

Stock that comes from the machine stuff chest varies greatly in consistency and as it gradually fills up the tank 1 and the paddle 2 swings through it, a pressure will, be

brought to bear on the face of the paddle that is proportional 'to the density of the stock. If it is thin, the pressure will be lightyif thick, the pressure will be heavier,

varying directly with the specific gravity of the stock. The operation of the apparatus is based upon this phenomena. As the stock flows through pipe 26 and, into the tank, pressureis exerted on paddle 2 and if the too great a density, depending on the adjustment of the apparatus, the spring 19 will be compressed, the tension will therebybe lessened on cable 6' and the bell crank 7 Willbe freeto respond 25, to any weighton the rods 8 and 9, gravity W111 cause spool 12 to slide downward on shaft 5, lever lel will raise the sliding gate 30 in the water box and fwater will flow throughfopening 32, Fig.4, and thence down pipe 24, andthin the too heavy stock in tank .1. When enough water has been admitted the right degree of consistency, less pressure will bea exertedon paddle 2, the compression in spring 19 will I pressure against the paddle, cable 6 will be pulled taut, bringing rods 8 and 9 into elevated position, rz'lisin-g the spool l2fand thus sliding gate 30 will be lowered cutting off somewhat the flow of 40 waterflthrough pipe 24. In practice it is Well, to have some water "flo\ving through pipe-24 and into the-stock in the equalizer tank, for almost always the stock comes from the stuff chest of too heavy a consist- I thinning. It will take some experimenting to get just th'e right adjustment for the spring, area of paddle, etc., for the weight ofpaper desired, but with all the adjustments made, this equalizer will hold the pulp to the correct consistency and a steady flow of uniform stock will pass through p1pe27 to the machine stufl' box. It is an easy matter then to set the stuff box gate to regulate the flow of stock to the ma- 5$fchine to get the desired weight of sheet re quired. Thus it will beseen that the stock fed to the machine stufl box of uniform consistencyand thatthe object ofthe inven- J tionislrather to equalize the stock than'to 60. regulate its 7 1 .Qsideration suggests other 7 valuable uses.

flow to the machine. This conthe intake side of Having thusdescribed myinvention, what I claim. is,

i 1. In a' pulp stock regulator, in'combinaQ tion' with a tank having a stock inlet and outlet and a water inlet contiguousto the stock inlet, of a central vertical shafttherein carryingthree horizontal arms, the lower arm being located at bottom of tank and acting as an agitator, themiddle horizontal arm having hinged thereon near its outer extremity an upright "arm or paddle, the lower'part of which reaches nearly" to the bottom of the ftank, means" for"r0tz 1ting a central shaft, a coil spring attached to'the top part ofthe paddle a'ndthe outer end of the top horizontal arm, a cable attached to the topofthe paddle'arin and to. one arm of a bell crank on the top side of the top horizontal armftwo jointed .veaicai rqas parallel with the central shaft, the bottom rod being attached toarm of bellcranlgthe top 'ar'm supporting a sliding spool jonft'he shaft, a lever at end and carrying a "vertical plate at outer end and a box in which said plate slidesfup and down anddividesintotwo sections,'one

2. In a stock r gulaitoifln 'ctnnbination with a tank w hichhas a stock inlet and outlet and a valter; inlet, of a hingedpaddle tached said wore/ate of the sections being connected to the'water inletinta'n'k. i

therein Whosedeflection is proportional to the density of the stock through which'it revolves and means for controllingkthe water supply] to I the tank dependent upon this defiection of the paddle. I

3.]In: a pulp sto ck regulator of the char acter describedmea'ns for revolyingahinged paddle, therein so that its deflection will be proportional to thegdensity of the :stock through which it revolves, I p

4. The method of regulating the consistency of pulp stockwhich consists of automatically adding ater to thestock inproportion to its 'density as indicated by the defiectionf of a hinged paddle thati revoli es through it. i THOMASW'ARNER.

'Witnesses C-v A E "I RQI-I. HAaarsoNJf A 5

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