US817333A

US817333A - Centrifugal sieving apparatus.

Info

Publication number: US817333A
Application number: US27311605A
Authority: US
Inventors: Hjalmar L Orrman
Original assignee: Individual
Current assignee: Individual
Priority date: 1905-08-07
Filing date: 1905-08-07
Publication date: 1906-04-10
Anticipated expiration: 1923-04-10

Description

PATENTED APR. l0, 1906.

H. L. GERMAN.

GENTMFUGAL SIEVING APPARATUS.

APILIUATION FILED AUG. 7, 1905.

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INVENTOR WITNESSES No. 817,333. PATENTED APR. 10, 1906.

f H. L. GERMAN.

CENTRIPUGAL SIEVING APPARATUS.

APELIOATION FILED AUG. 7, 1905.-

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HJALMAR L.' osRMAN-,or .DAYTomomo l cENTnlFuG'ALfsIEvINQ A'PPAnAjrus.

i Specification of Letters Patent. 1

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To all whom itmay concern:

Beit known that I HJALMAR L. QRRMAN, a citizen of the United States of America, and a resident of Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements. 1n Centrifugal Sieving Apparatus, of which the following is a specicatlon.

My invention relates to that class of machines in which centrifugal force is employedV 4to throw the material to be sleved upon a screen. l v t The invention is an improvement upon the Ruth machine as set forth 1n hls Patent No.

781,097, of January 31, 1905., and assigned to One of the objects of the invention is to provide a com act compound screening` machine that Wil not only eflicientl serve for screening ground wood, sulfite, so a iiber, andcellulose, but will serve also for screen* ing paper-stock justbefore it enters the paper-making machine. As usual, the material contains water during the operation of converting it into a liquid pulp.

Another object is to provide against lossof useful fiber that might be thrown away with the tailings. V By my invention also-I am able to save space, piping, power, and attendance, and as a consequence of the objects gained there is reduced cost of manufacture and operation.'

Without regard to the various scopes of novelty which are attended to in the clalms the general nature of the invention comprises i an `arrangement by which the. whole screening process is performed and repeated in one piece of apparatus, whichconsists, essentially, of a vertical shaft, rota 4beaters, in sets which are at dierent leve s and `attached to said shaft, troughs at each set of beaters for catching the screened material, a pipe co`n` necting the said troughs to a. common delivery-pipe, troughs for the talhngs at the respective sets of beaters, a pipe connecting the `upper one of the last-named troughs to the next lower beaters, and an outlet-pipe for the lowest tailings-trough.

The machine will now be described by reference to the accompanying. drawings. j

Figure 1 represents a general vertical central section. at about the line'l 1 of Fig. 1. Fig.3 is a vertical section on the line 2 2 of 2, but with the beaters 3a in a different. position.

Fig. 4 is a general outline of the machine and ave a projecting rim 26, wit

Fig. 2 is ahorizontal section the locking'device for thesieverum. Fig.A

6 is an enlarged viewwfromv adifferent direction, of the lcking device for the sieve-drum, being avertical section about on the line 5.5 of Fig. 6.

.As noticed, many elements in the upper part of the machine are like those in the lowerfrom the exterior 4in elevation, with portions 'l FI 11s an enlar ed viewof part and are therefore. numberedv somewhatI similarl by adding a ""after the referencenumeras applied to the lower part ofi the figures. will describe ,the upper portion y 7o y,

the beater with about the same inclination i lrelatively to the shaft as that of the surface v of the conical runner l5. The channel 6 grad? lward and outward a ong the whole length of ually lessens in depth from a maximum at the top tonothingat the bottom, owing to the slight inclination ofthe beaters 3 to the vertical bottom of th'esaid channel, as most clearly seen in Fi .'3. At thetop there is an inlet-pipe 7, whic extends throu h the cover B of the sieve-drum and throu the cover C of the casing 1. The lower en of the inletwhich is a. deflector 9,`by which the inlet from the pipe4 7 becomes annular and terminatesV just above the beaters 3 and-directly op osite the `upper ends of the channels 6. he radial dimension of this annular passage-way between theelements 8 and 9 is only a little pipe 7'is spread out into a hood 8, central with less than the widthof the channels 6, so that the pulp is delivered in la circular stream directly into the.l channels 6. p,

-At the foot of the drum-2 are two troughs concentric to each other around the shaft'4..

The trough 11 is on the inside of .this-drum 2, and thetrough 10 is on the outside. v'These trou hs 104 and 11 are'all in a singllJ casting 'n which ts the sieve-drum 2, and a ring 27, so that' the sieveis between the lattertwo arts. The ring 27 carries a screw-pin 28, w 'ch is held 4down by the lookin -piece 29, .which projects4 over the pin 28. lhe rim 26 is notched, so

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that the ring 27 by being turned Vmay cause the pin 28 to escape from said notch, and thus release the drum 2. Screws 3() hold the lockingpiece 29 permanently across a part of said notch. Caution should be taken to have the notch in such a direction under the lock-A ing-piece 29 that any clogging of the pulp between the `beaters -3 and the screen 2 lwill twist the screen in a direction opposite to that required for wholly removin the sieve-drum. Before I provided this loc in device the sieve-drum 2 was occasionally hfted and displacedfrom its proper position by the action of 'the pulp. There are several such locking devices.

From the bottom of the'trough 1l leads an outlet-pipe 19 horizontally and radially inward to such a distance that when it is bent down again vertically its vertical axis about coincides with the axis of the shaft 4. Accordingly there is a stuffing-box 21 on the upper "de of the pipe 19 for the' shaft 4. The lower end lof the pipe 19 terminates in a hood 8a, which surrounds a conical deflector 9a, just above a conical runner 5 for supporting radial beaters 3a, having channels 6a.

All the other parts having a reference-numeral followed by a are similar to those already described having the same referencenumerals without the letter a.

The trough 10 is provided with an outletpipe 12, connecting with a pipe 14, which passes down to communicate with the pipe 24, which also joins the outlet-pipe 12a o t e trough 10u. The trough 11a has a final outlet-pipe 13.

The gear-wheels 15 drive the shaft 4 and are driven bythe pulleys 32.

Pillars 23 have brackets 22 supporting the upper screening-machine by being locatedv under the trough 10, while the brackets 22a on said pillars are under the trough 10a. The pillars 23 are on a base-plate 33.

If desired, a pipe 18 may be led into the trough 11 and 11L for introducing water for washing out the tailings.

A valve 3 5 is provided in an extension of the pipe 7 forr regulating the entrance of the pulp.

A pipe 20, opening into the pipe 19, is provided for adding more water to the tailings passing through the pipe 19, as otherwise they are liable to be too dry to properly rescreen.

Having described the construction, I will now set forth the operation and utility of the different parts. In the first place the paperstock or any kind of pulp iows past the valve 35 into the pipe 7, then passes by an annular path between the deflector 9 and the hood 8, whereby the vpulp is directed from an axial travel and is ldistributed in a circular stream to the various channels 6, which are rotating with the beaters through the action of the shaftv4, the pulp being thrown out against the screen 2 and spread thereon uniformly,

whence the pulp flows down both' sides of the before, to the

troughs

10a and 11a. The taili ings fallin to the trough 11a are now exhausted of goo fiber andhave their. exitv throu h the pipe 13, While the rescued us'ful pu p finds its way through the pipe 12a, where it joins the material going out of the pipe 24.

In the sin 1e type of screening-machine there is the isadvantage existing that the tailings separated b the screening process carry with theml a large amount vof useful pulp or paper-stock, which must be lost or recovered by an entirely separate machine. By my invention the rotation of one shaft causes complete separation, thereby saving gearin connections, space, securing convenience, an producin a compound apparatus which may be manu actured and shipped as one article.

It is apparent that my invention may be modified in certain details without departing from the scope thereof as attended to in the claims.

I will now explain more particularly an advantage of the invention, especially with reference to the offset 20. In .the first place all the pulp and paper-stock and the water connected with it go through the screens and should not be admitted to. the paper-making machine except through the screens. On the paper-machine most of the water separates from the pulp, and this water is usually saved and called the backwaten It usually contains some fiber, china-clay, size, &c.,' and as heretofore practiced is pumped up into a vessel placed on a higher level than the screens. From this vessel the backwater is run back to the screens in the proportion reuired to make thepaper in question, and if ffhere is more of this backwater than required it is run away or saved and used in some manner not connected with the screening process. Such is the usual method of operating independent of what kind of screens are employed.

By employing the connecting-pipe 19 and the offset 20 in the combination set forth it allows me to admit the backwater through the odset 20, so that I can regulate the flowage on the paper-machine. I am aware that it is old to use the backwater and the fiber it contains over again; but in my invention I admit the backwater exactly in the proper place. Without the pipe 19 the compound IOC IIO

\ hold that the backwatermust be used.

screen could not be worked raeticall and without the offset 2() it woulil not fu fil the proper requirements. The tailings from the upper screen need water to be first thinned out and then rescreened. Common fresh water would serve as well. for that pur ose; but paper-makers wouldnot consent. lfhiey much as is required to secure the proper flow age in the paper-machine is admitted through the ol'l'set 20, and this amount of backwater is far in excess of what the tailings would refrom the beaters; troughs at the foot of said drum and located respectively insidel and outside of the same for receiving res ectively the tailings and screened portion o the material, a second set of beaters, a drum, and two troughs like the first named, a common delivery-pipe for the troughs that are for the screened material from the two drums, a pipe connecting-the firstnamed trough for the tailings with the second-named set of beaters for feeding the tailings to these lastmentioned beaters, a discharge-pipe for the second-named trough for the tailings, a shaft for driving both sets of beaters which are rigidly connected to said shaft, and a driver for said shaft. p

2. The combination of a vertical shaft, a driver therefor, an upper and lower set of beaters connected to and driven by said shaft, screens op osite the beaters for receiving any materia thrown off by centrifu al action by said beaters, a pipe connection or conveying the tailings from the upper machine to the beaters of the lower machine, and a pipe for conveying the screened material from the u per machine to join the screened materia from the lower machine.

3. The combination of a vertical shaft, a driver therefor, an upper and lower set of beaters connected to and driven by said shaft, screens opposite the beaters for receiving any material thrown off by centrifugal action by said beaters, la pipe connection for conveying the tailings from the upper machine to the beaters of the lower machine, a

ipe for 'conveying the screened material fiom the upper machine to join the screened material from the lower machine, casinvs surround ing both machines, posts, and bracliets on the posts supporting the respective machines.

4. The combination of a vertical shaft, a driver therefor, an upper and lower set of beaters connected to and drivenby said shaft, screens opposite the beaters for receiving any material thrown off by centrifugal action by said beaters, a pipe connection for conveyingr the tailings from the upper machine to the beaters of the lower machine, a pipe for conveying the screened material from the upper machine to join the screened material from the lower machine, sieve-drums for said machine, rngssupporting said drums, castings .having rims for holding one of said rings in each machine, and locking devices connecting said drums to said rims.

5. In a centrifugal sieving apparatus the combination of a casing having-a bearing, a sieve-drum in 4said bearing, a pin fastened to the drum, said casting having a notch, a projection over a ortion of the notch, and said pin extending into said notch.

6. In a centrifugal sieving apparatus, the combination fof two' castings, one directly abovethe other, a sieve-drum within eac casing, a set of rotating beaters within each sieve-drum, for receiving the material to be .acted upon and delivering the same by centrifugal action to the said sieve-drums respec tively, a vertical shaft common to both sets of beaters, the said beaters being fixed upon and driven by said shaft, a frame common to and supporting both of said casings and having bearings for said shaft, an inlet in the top of the upper casing, for delivering the material to within the sieve-drum andv to the u per set of beaters, a pipe for delivering t e tailings from the u per sieve-drum to the beaters within the ower casing land sievedrum, another (pipe joining the first named, for supplying a ditional water to the tailings therein, a final outlet in the lower easing for the tailings from the lower sieve-drum, an outlet in the lower casing for the screened material, and a pipe for conveying the screened material from the upper casing and adding it to the screened material issuing from the outlet of the lower casing.

7. In a centrifugal sieving apparatus, the combination of a casing, a sieve-drum within the casing, a set of rotating beaters Within the sieve-drum, a second group of elements like the above named, the two groups being located one above the other, a common shaft upon which said two sets of beaters are fixed and by which they are driven, a frame common to and vsupporting both said easings and having bearings for the said shaft, an initial inlet for supplying material to the upper set of beaters, a passage for conveying the tailingsfrom the upper sieve-drum to the lower set of beaters, a final outlet for the tailings from the lower sieve-drum, means for conveying the screened material from the upper sieve-drum to join that from the lower sievedrum,'and a common delivery for the admixture of screened material from the two sieve-drums.

8. The combination of a shaft, a driver therefor, an upper and'lower set of beaters IOO IIO

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connected to and `driven by said shaft, screens opposite the beaters for receiving any materia thrown .off by centrifugal action from said beaters a pipe for conveying the tailings from the u er machine to the beaters of the lower mac lne, an offset pipefrom the :firstnamed pipe for receiving'water to thin the tailings, from the upper machine, and outletpipes for the lower machine.

9.- The combination of two screening-machines, rotating'beaters for both machines,`- a pipe for conveying` the tailings from one machine to the beaters of the second machine, and an offset from said pipe for receiving water. i A

In testimony whereof I have hereunto signed my naine,- in the presence of two subscribing witnesses, this 2d day of August,

RoBT. C.- PATTERSON, EDITH BANKER.