US2540517A - Paper stock screening apparatus - Google Patents

Description

mEbLL1951 M. A. GLASCO 2,540,517

' PAPER s'rocx SCREENING APPAR'ATUS Filed May 11, 1948 3 Sheets-Sheet 2 Fig.2.

Inventor Mark A. Glasca I WWW M. A. GLASCQ PAPER STOCK SCREENING APPARATUS Feb. 6, 1951 S Sheets-Sheet 3 Filed May 11, 1948 w w 24w 6 72/ 6 m 3 2 .5 4 4 HHHHH H m m0 8 Q i .mfl I J W w ma m J m M. nHMHu m 4 fi m M w m Inventor Mark A Glasco Patented F ch. 6, 195! UNITED STATES. PIA-TENT oF-FicE 2,546,517 I p a Application May 11", 1948, Serial nazasci (cr'szi-cai -3Claims'.

- This invention relates to new and useful improvements and structural refinements -in machines for screening paper stock or pulp, and

the principal object of the invention is to effect the separation of particles of foreign matter from the paper stock in a highly eflicient and expeditious manner.

2 in the arrangementand construction of parts as illustrated in the accompanying drawings, in-

- Figure .1 is a verticalcross'sectional view of the invention;

Figure 2 is a cross sectional view, taken substantially in the plane of the, line. 2-2 in This object is achieved by the provision of an apparatus wherein the paper stock undergoes two separate stages of purification, the first stage taking place in what may be referred to as a primary chamber where relatively large particles of foreign matter are separated by gravity, and the second occurring on a foraminous top of a secondary chamber, where relatively small and light particles of foreign matter are separated by the effect of vibration and rocking to which the secondary chamber with its foraminous top or screen is subjected.

An important feature of the invention resides in the provision of means for simultaneously vibrating the secondary chamber and rocking the same from one side to another, whereby the second purifying or screening operation is not only effectively performed, but whereby the foraminous top of the secondary chamber is prevented from becoming obstructed-K An additional feature of the invention lies in the provision of a rotating agitator in the primary chamber and in the provision of a rotating, flexible brush member which is movable on the foraminous top of the secondary chamber, both the agitator and the brush member materially'assisting in the separation of foreign matter from the paper stock. r A still further feature of the invention resides in the provision of resilient or yieldable supporting means for the secondary chamber, whereby the latter is permitted to vibrate as well as to rock while the screening operation is in.

progress.

An important'advantage of the invention'lies in its simplicity of construction and in its comparatively small size, which enables the apparatus to be installed and efficiently operated even in relatively small plants.

Another advantage of the invention resides in its simplicity of operation, so that it may be efliciently supervised and serviced evenby persons of comparatively limitedskill. r

With the above more important objects and features in view and such other objects and features as may become apparent as this specification proceeds, the invention consists essentially Figure 1;

Figure 3 is a cross sectional view of the vibrating head and rocking mechanism used in the invention; 7 v Figure 4 is a cross sectional view taken substantially in the plane of the line 44 of Figure 3;

Figure 5 is a cross sectional view, taken substantially in the plane of the line 5 5 of Figure 3 Figure 6 is a cross sectional view, taken substantially in the plane of the line 6- 6 of Figure 1; and

Figure 7. is a perspective view of a brush member used in the invention.

Like characters of reference are employed to designate like parts in the specification and throughout the several views.

Referring now to the accompanying drawings in detail, the invention consists of a paper stock screening apparatus designated generally by the reference character I0, the same embodying in its construction a plurality (preferably six) upright frame members l2 which are equally spaced and which may be of I-shaped cross sectional configuration, having their lower end portions provided with suitable feet l4 so that they may be firmly secured to a floor, or some other supporting structure.

A substantially cylindrical body I61 is secured by welding, or the like, to intermediate portions of the frame members 12, thebody l6 providing what may be referred to as a primary chamber ll and having substantially frusto-conical portions '20, '22 equipped with an outlet neck 24 and a in one side thereof with a paper stock inlet duct 28.

The upper end portions of the frame members 7 l2 are 'outwardly ofiset, as is best shown in Figure 1, and are provided with suitable dish-shaped plates 30 constituting seats for compression springs 32, 'hereinafter again mentioned.

An annular vessel '3l, co'nfigurated substantially as shown, surrounds the neck and the frusto-conical portion 20 of the, body II, the

vessel 3 4 forming a secondary chamber 1' form ofa screen securedby suitable screws to an inwardly projecting annular flange 42 with which the vessel 34 is provided. The foraminous wall or screen i urrounded by an annular rim 44 formed by the circumferential wall of the vessel 34, and a set of outwardly projecting angle brackets 46 are secured to the rim Id and rest upon the aforementioned compression springs 32. Moreover, additional compression springs are positioned on the brackets 46 (see Fig. 1) and center bolts extend through the seats 36, compression springs 22, brackets 46 and springs 66, being equipped at their upper end portions with inverted spring seats 62 and pairs of lock nuts ll.

4. surface III of the unit 14, the depressions I being diametrically opposed' and being disposed exteriorly with respect to a retainer ring I" provided in the unit I4 for the purpose of re- 1 taining the roller bearing assembly 66 in position. The unit 16 is, of course, axially aligned with respect to the unit It, and the under surface II. of the unit I6 is formed with an annular groove 2 constituting what may be referred to as a track for the balls I02. In effect. the groove or track II2 assumes the form of an annular row of concave depressions which over- A three-legged spider 6! includes a central the compression springs 32 I6, and the bolts -62,

passing through the brackets 46 as well as through the end portions 66, are somewhat longer with respect to the bolts 60 for obvious reasons.

However, the bolts 62 as well as the bolts 56 are.

provided with the inverted spring seats 52 and lap or intersect one another as shown in F18- ure 5, so that-portions of the grooved track are alternately deep and shallow. That is to say, the relatively deep portions of the tracks are the depressions themselves, while the relatively shallow portions are the points of intersection or overlapping of the depressions. as indicated at III. (See Figure 5.)

The balls I02 are intended to engage and travel in the track II2 when the unit I6 rotates while the unit I4 remains stationary, and each time pairs of lock nuts 56. It is to be noted at this point that the brackets 66 as well as the end the balls move from one set of depressions of the track to another set, they surmount the relatively shallow points or portions Ill, thus urging the unit ll together with the shaft 82 down- Y wardly from the unit 16. On the other hand.

are free to rock (in unison) from one side to -an'- other, as exemplified by the arrows 6.6.

An outturned lip '60. conflgurated as shown in Figure 1, is provided on the outlet neck 2|, the

lip 68 overhanging or extending above the screen 10, whereby material discharged upwardly.

through the neck 24 will be deposited on the] screen.

As is facilitated by the resilient mountings .32, 46. the vessel 04 as well as the spider 66 are subjected to simultaneous vibration and rocking from one side to another, the vibration being effected by means of a vibrating head, designated generally by the reference character ll, while the rocking is eflected by means of a rocking mechanism designated generally by the reference through the neck 26 into the primary chamber I8 and carrying a propeller-shaped'agitator 04.

A brushing member 66 is carried by the shaft 82 and comprises a boss 68 formed integrally with a radially extending arm 66, the boss 06 being keyed to the shaft 02, as at 62, and a spacer 6| being interposed between the boss and the under surface of the boss 68 of the spider 66, substantially as shown in Figure 1. The outer end por I. This tion of the arm 90 is provided with a slot 96 in which is secured a flexible brushing blade 96 by fastening elements such as the rivets I66. It is to be noted that the blade 66 of the'brush member 06 is movable over the screen 06 whilethe" shaft 62 rotates. I

The aforementioned vibrating head 'Il-alsoincludes a pair of-balls I02 whichare'seated in concave depressions I04- provided inthe after the balls have surmounted the shallow points, they are received in the next set of depressions, permitting the unit I4 and the shaft 02 to rise upwardly toward the unit 10. It will be apparent that as the unit I6 is rotated, a reciprocating, vibratory motion will be imparted to the unit I4, and hence to the spider 06, the vessel 24 and the brush member 66. The shaft 62 is non-rotatably but slidably connected at its upper end to the unit I6 by means of a key III.

The aforementioned rocking mechanism 12 includes in its construction a drive spindle III which is normally in axial alignment with the shaft 02, the spindle II8 carrying a face plate I20 which is secured thereto as at I22. A pair of diametrically opposed studs I24 are provided in the face plate I20 and project downwardly therefrom, being equipped with antifriction roller sleeves I26.

These sleeves slidably and rotatably engage a pair of diametrically opposed slot I20 formed in a flange I30 of the aforementioned unit I. and a spherical fulcrum element I32, seated in a concave depression I24 formed in the center portion of the flange I30, shiftably engages a dish-shaped depression or recess I36 formed in the under surface of the face plate I20.

Itshould be explained at this point that matters are so arranged that the compression springs 32, 4,6, acting in mutually opposite directions, retain the spider 56 in such position that the unit 14 is disposed as close as possible to the unit I6 so as to urge the balls I02 in engagement with the track H2, and also, that the 'entire vibrating head 10 is disposed as close as possible to the face plate I20, thus retaining the element I32 in the recess I36.

When the spindle H0 rotates, the head 16 will, of course, impart vibratory movement to the spider 56 and to the vessel 34, as already described, and at the same time the element I 32 will be permitted to shift from one side of the recess I36 to another, so that the entire head II.

the shaft 62, the spider 56 and the vessel 24 nevertheless they are present and simultaneous. If desired, a suitable Weight 9| may be secured to the arm 90 to accentuate the rockin motion by virtue of its eccentric disposition with respect to the shaft 82.

If desired, the mechanism 12 may be surrounded by a protecting enclosure I38 provided on the under side of a stationary plate I40, the latter also being used to support an electric motor I42 which rotates the spindle II8 through the medium of a suitable reduction drive I44. It will be noted that the enclosure I38 will effectively restrict the extent of the rocking movement of the mechanism '12, as exemplified in Figure 3 wherein an edge portion of the flange I30 contacts an annular groove I45 provided in the closure I38.

Finally, it should be added that the chamber 36 is provided with a screened pulp outlet duct I46, while a'refuse discharge opening or recess I48 is formed in the aforementioned flange 44.

Having'thus described the construction of the invention, its method of operation will now. be explained.

The paper stock which is to be screened is admitted through the duct 28 into the primary chamber I8, where the rotating agitator 84 will cause relatively large, heavy particles of foreign matter to become separated from the paper stock and gravitate downwardly through the sediment outlet neck 28, while the paper stock itself will be discharged upwardly through the outlet neck 24 onto the screen 38. It is to be noted in this connection that the agitator 84 not only rotates, but oscillates in all different vertical planes within the chamber l8, the oscillating of the agitator being effected by the rocking mechanism 12.

In any event, the paper stock discharged onto the screen 38- will be distributed over the screen by the rotating brush member 88 and pulp fibres will be caused to pass through the screen into the secondary chamber 36, from which the screened pulp may be evacuated through the duct I46 by suction or gravity. Simultaneously, light rejects, etc. will be forced to the outer edges of the screen, and ultimately discharged through the opening by the brush member 86 or by gravity.

The screening operation is materially facilitated by the simultaneous vibration and rocking of the vessel 34 together with the associated screen 38, which vibrating and rocking motion is, of course, effected by means of the aforementioned vibrating head I and by the action of the off-balanced member 86 on the rocking mechanism I2, respectively. The screened paper stock is discharged from the apparatus through the recess or opening I46, and attention is particularly directed to one important feature of the invention, namely, the rocking action of the vessel 34 in various different vertical planes. While the paper stock is being screened, the pulp fibers may become caught in the openings of the screen 38, with the result that the screen would normally become clog ed or otherwise obstructed. However, in the instant invention, the vessel 34 is rocked from one side to another, causing the pulp fibers to change their positions and vibration causes them to travel over the screen until they ultimately pass therethrough. As the screen is tilted in various directions, any fibers which may become lodged in the screen while passing therethrough will be "washed," so to speak, by the circular or partially circular flow of the stock in the chamber 38, thus freeing the caught fibers and preventing the screen from becoming ob- 6 structed. The flow of stock in the chamber 38 is produced by the rocking of the chamber in various directions, causing the stock in the chamber to gravitate from one side to another.

The accompanying Figure 3 illustrates the rocking mechanism 12 in action, the amplitude of the rocking motion being somewhat exaggerated for illustrative purposes.

If desired, a normally closed retaining valve, or the like, as indicated at I50, may be provided in the neck 26 to retain heavy rejects in the chamber I8, until it is necessary to discharge such rejects through the neck 26.

Having described the invention, what is claimed as new is:

1. In a paper 'stock screening appartus, the combination of a substantially tubular primary chamber provided in one side thereof with a material inlet port and having an outlet port at its upper end, an annular secondary chamber surrounding the upper end portion of said primary chamber and having a foraminous top adapted to receive material discharged from said outlet port, said secondary chamber being provided with an outlet opening disposed below the foraminous top thereof, an upstanding marginal rim provided at the outer edge of said foraminous top and formed with an outlet recess, a rotatable agitator shaft extending into said primary chamber through the outlet port of the latter, an agitating member secured to said shaft in said primary chamber, and a brush member secured to said shaft and engageable with said foraminous top.

2. The device as defined in claim 1 together with stationary supports for said primary chamber, means for movably mounting said secondary element being rotatable in one of said seats and engageable with the alternate depressions and crests of said track.

' MARK A. GLASCO.

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

UNITED STATES PATENTS Number Name Date Re. 18,530 Munro July 19, 1932 34,945 Crocker Apr. 15, 1862 310,469 Schlatter Jan. 6, 1885 607,312 Westwood July 12, 1898 690,781 Jamieson et al Jan. '7, 1902 1,138,741 Fowler May 11, 1915 2,029,848 Wettlaufer Feb. 4, 1938 2,033,123 Cowles Mar. 10, 1936 2,406,618 Lindgren Aug. 27, 1946 2,416,499 Saxe Feb. 25, 1947 FOREIGN PATENTS Number Country Date 4,560 Great Britain of 1896 129,943 Germany Apr. 18, 1902 617.487 Germany Aug. 19. 1935

Images