US2424726A - Pulp beater and selector - Google Patents

Description

uly 29, 3947. H. D. WELLS PULP HEATER AND SELECTOR Filed Dec. 28, 1944 2 Sheets-Sheet 1 Jinn ens.

July 29, 1947. H. D. WELLS 6 PUL? Baum ANDYSELECTOR Filed Dec. 28, 1944 2 Sheets-Sheet 2 I Patented July 2, wil

PULP BEATER E SELEQ'EQR Harold Donald Wells, Glens Falls, N. Y. Application December 28, rats, Serial No. 5%,151

Fig. 2 is an enlarged sectional view through the coacting screen and impeller and associated parts. I

Fig. 3 is a fragmentary bottom plan view of the impeller shown in Figs. 1 and 2.

Fig. 4 is an enlarged detail section on line ii of Fig. 3.

Fig. 5 is a fragmentary-top plan view of the screen shown in Fig. 2.

Fig. 6 is an enlarged detail vertical section on line 6-5 of Fig. 5.

Fig. 7 is a view similar to Fig. 2 but showing a difierent form of construction.

Fig. 8 is a horizontal sectional view on line 88 of Fig. 7.

Preferred features of construction have been illustrated and will be rather specifically described, with the understanding, however, that within the scope Of the invention as claimed, variations may be made.

A suitably supported tank i is shown, in which the paper-making material is immersed in liquid. The bottom H of this tank is curved upwardly at I2 to the side wall Hi to facilitate vertical circulation of the pulp, as indicated by the arrows in Fig. 1.

A central opening It is formed in the tank bottom II, and a, shallow selected-pulp-receivingand-discharge-casing I is secured in said opening. This casing 95 comprises a continuous side wall l6 fitting within the opening Idand having a lateral flange l1 secured by screws or the like l8 upon the tank bottom I I, a bottom l9 integral with said side wall l6 and having selected pulp.

outlets I9 connected with suitable pipes 2n, a

- central hub 2i integral with the central portion of said bottom l9, and a screen extending from the upper end of said hub 2| to the upper end of said side wall Hi. In the form of construction 2 form of construction shown in'Figs. 7 and 8, however, the screen is in the form of a suitably per forated plate 25 which may be secured in place by any suitable means, the screws 26 being shown in Fig. 3 for this purpose.

The boss 22 and the bottom is are jointly formed with a downwardly opening recess 2? and the upper end of said boss has a central opening shown in Figs.-1 to 6, the screen is in the form of the outer end portions of said grooves. In the i 28 communicating with said recess-2i. This recess receives the upper end of a bearing assembly '29, the housing 30 of which is secured at it to the lower end of the hub 25, the securing being preferably done with the aid of shims 32 which permit vertical adjustment of the entire assembly 29. This assembly rotatably mounts a vertical shaft 33 and holds it against end play. The upper portion of this shaft passes through the open ing 28 with which a suitable packing box 3 1 is associated. A belt drive 35 is shown for the shaft 33 in Fig. l, operatively connecting said shaft with an electric motor '36, and below said belt drive,

there is preferably another bearing 3? for said shaft.

An impeller is secured upon the upper end of the shaft '33 for imparting. a vertical circulation to the pulp and for performing various other operations hereinafter described. In Figs. 1 to 4, the impeller is denoted at 38 and in Figs. 7 and 8, at 38'.

The impeller 38 comprises a central hub 39 and circumferentially spaced arms ib integral arm 40 is preferably longitudinally concave as shown, and this sidepreferably curves transversely from the lower side 43 of the arm to the upper edge of the front side 4|, as seen best in p 4. Each arm is formed with a plurality of longitudinal grooves 44 which open through its lower side 43 and extend from the hub 39 to the outer end of the arm. This impeller construction is such that the pulp will be effectively rubbed and brushed against the screen plate 22 and such that it will impart a vertical motion to the pulp, as well as vertically pulsating the pulp to keep the screen clean. The rubbing and brushing of the pulp between the impeller 38 and the screen,

effectively defibers' and. hydrates'said pulp and moreover the individual fibers will be fibrillated and their ends will be effectively broomed. bviously, any relatively large masses of the pulp and large fiakes will be forcibly struck by the arms 40 andwill thusbe broken up to aid in rapid reduction to pulp of the required fineness.

As this fineness is reached, the selected pulp discharges through the slots 2| into the casing I8 and may discharge through the pipes 2|, and ob-. viously the apparatus'may either operate continuously or upon batches.

The impeller 38' shown in Figs. '7 and 8, comprises a hub 39' and outwardly projecting arms 0' integral therewith and operable over the screen plate 25. Insofar as their longitudinal shape is concerned, the armslfl are very similar to the arms 40. They are preferably, however, of rectangular form in transverse section as will be clear from Fig. 7 and their lower sides are devoid of grooves. This construction is more simple than that disclosed in Figs. 1 to 4 and is less rapid in operation, yet nevertheless constitutes quite an improvement over conventional apparatus for performing the functions above explained. It will be obvious that the impeller 38' could be used with any appropriate kind of screen and is not restricted to use with the specific screen plate 25. It will also be understood that the impeller 38 could be used in connection withvany suitable screen and is not, therefore, restricted to use with the screen plate 22'. The impeller 38 could well be used with the screen '25 and the impeller 38' with the screen 22, if desired. The impeller 38 or 38' may be adjusted further toward the screen by adding one or more of the shims 32, to increase the brushing and scrubbing defibering actions, for better defibering hard sized fibers (stuck together with glue or the like). paper and dry baled pulp, and frozen-pulp. Also it gives the pulp fibers a brushing, fibrillating and booming action insuring better and stronger paper. The apparatus does work similar to that performed in the conventional paper mill beater, in'which the blades of the beater roll coact with the blades of the bed plate to brush, fibrillate and hydrate the pulp fibers for making into well formed and strong paper. It improves the usual beating method by fast circulation, thorough mixing, short cycles of pulp travel for an increased number of beatings, etc., thereby saving time, increasing capacity and effecting greater efficiency. For effective beating, the pulp canbe worked in batches and when satisfactorily beaten, it canthen be drawn off through. the screen, thereby preventing chunks from passing along with beaten pulp, or the machine can be operated continuously for improved and quicker pulping, resulting from the additional brushing, scrubbing and defibering. 4 While preferences have been disclosed, attention is again invited to the possibility of making variations within the scope of the invention as claimed.

I claim: 1. In a pulp beater and selector, a pulp discharge screen forming part of a tank wall, a rotary shaft perpendicular to said. screen and disposed centrally thereof, and an impeller secured to-said shaft in spaced opposed relation with the inner side of said screen, said impeller having circumferentially spaced arms projecting away from said shaft and spaced from said inner side of said screen in the direction of the shaft axis, said inner side of said screen being exposed to thetank interio'r between said arms, said arms each having a front side of a width to beat the pulp and vortically circulate the same,'said arms being sufllciently close to said screen to cause said arms and screen to coact in giving the pulp fibers a thorough rubbing and brushing, thereby simultaneously defibering and hydrating the pulp, and fibrillating the individual fibers and brooming their ends.

2. In a pulp beater and selector, a pulp discharge screen forming part of a tank wall, a rotary shaft perpendicular to said screen and disposed centrally thereof, and an impeller secured to said shaft in spaced opposed relation with the inner side of said screen, said impeller having circumferentially spaced arms projecting away from said shaft and spaced from said inner side of said screen in the direction of the shaft axis, said inner side of said screen being exposed to the tank interior between said arms, said arms each having a front side of a width to beat the pulp and vortically circulate the same, at least the inner end portions of said front sides being tangential to a circle concentric with said shaft to vortically circulate the pulp, said arms being sufllciently close to said screen to cause said arms and screen to coact in giving the pulp fibers a thorough rubbing and brushing, thereby simultaneously defibering and hydrating the pulp, and fibrillating the individual fibers and brooming their ends. j

3. In a pulp heater and selector, a pulp discharge screen forming part of a tank wall, a rotary shaft perpendicular to said screen and disposed centrally thereof, and an impeller secured to said shaft in spaced opposed relation with the inner side of said screen, said impeller having circumferentially spaced arms projecting away from said shaft and spaced from said inner side of said screen in the direction of the shaft axis, said inner side of said screen being exposed tothe tank interior between said arms, said arms each having a longitudinally convex front side of a width to beat the pulp and vortically circulate the same, the inner end portions of said longitudinally convex front sides being tangential to a circle concentric with said shaft, said arms being sufficiently close to said screen to cause said arms and screen to coact in giving the pulp fibers a thorough rubbing and brushing, thereby simultaneously defibering and hydrating the pulp, and fibrillating the individual fibers and brooming their ends.

4. A structure as specified in claim 1; said screen consisting of a plate having substantially radial grooves in the side thereof. toward said arms, and pulp discharge slots through said plate between said grooves.

5. A structure as specified in claim 1; the sides of said arms toward said screen having longitudinal grooves.

6.- A structure as specified in claim 2; the sides of said arms toward said screen having longitudinal grooves.

7. A structure as specified in claim 3; the sides of said arms toward said screen having longitudinal grooves.

8. In a pulp heater and selector, a screen for coaction with a rotor, said screen comprising a plate having substantially radial grooves in its rotor-facing side, and pulp discharge slots extending through said plate between said grooves.

9. Apparatus of the character described comprising a tank containing stock to be treated,

-apump-like impeller mounted for rotation in ing a vortical circulation, said impeller having fiber beating, fibrillating and hydrating grooves in the underside of said arms, and a grooved base coactlng with said grooved impellerarms, said base having screen openings between'its grooves.

HAROLD DONALD WELLS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date Coleman Aug. 18, 1863 Number Number 2,033,123 2,289,612 2,351,728 2,371,837 2,156,321 Re. 4,976 2,265,936 1,760,446 10 1,790,830

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