US1185433A - Shaker-screen apparatus. - Google Patents

Description

0. G. PETERSEN.

SHAKER SCREEN APPARATUS.

kAPPLICATION FILED 1:AN.6, 1913- 1,185,433. Patented May 30,1916.

4 SHEETS-SHEET l.

WI T NESSES .i

0. G. PETERSEN.

ASHAKER SCREEN APPARATUS. APPLICATION FILED IAN.6. 191s.

, Lw.' lPmemed May 30,1916.

4 SHEETS-SHEET z..

fm WITNESSES.- IN1/EN TOR.

0. G. PETERSEN.

SHAKER SCREEN APPARATUS.

APPLICATION FILED.JAN.'6,191'3.

Patented May 30,1916.

4 SHEETS-SHEET 3.

WITNESSES:

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0. G, PETERSEN. SHAKER SCREEN APPARATUS.

APPLICATION FILED JAN-6,1913.

Patented May 30,1916.

A gag/ff? 4 SHEETS-SHEET 4.

' ggf@ INVENTOR.

TINTTED STATES PATENT oFFrcE.

OLUF G. PETERSEN, 0F lI'JOIJ'ISVIILLE, KENTUCKY.

SHARE-SCREEN APPARATUS.

Specification of Letters Patent.

Patented May 30, 1916.

Application led January 6, 1913. Serial No. 740,493. y

T 0 all whom/lit may concern.'

Be it known that I, OLUF G. Pn'rERsnN,

a citizen of the United States, residing at constructions, arrangements, and combina.-

tions. within the spirit and scope of the in vention. l'

An object of the"invention,is tofprovide certain improvements in suspended vshaker screens with the ends in view of increasing the capacity thereof and decreasing the op erating power requiredv as well as the shock transmitted to the' screen supporting frame.

A further object' of the .invention is to provide certain improvements in-details of construction,and in combinations and arrangements of 'parts, whereby a highly eiiilcient and durable shaker screen will be produced. Y f

The invention consists in certain novel -features of construction and in combinations and arrangements as more fully and particularlv set forth and specified hereinafter.

Referring to the accompanying drawings :`-Figure 1, is a side elevation of apparatus involving my invention, dotted lines Vindicating certain hidden parts. Fig. 2, is

a sectionon the line A--B, Fig. 1. Fig. 3, is a section on the line C-D, Fig. 1.' Fig. 4, is a top plan, certain parts being broken away. Fig. 5, shows one of the screen hangers in edge and side elevations. Fig.

6, is a detail elevation showing a modied lsupport for screen hangers. Flg. 7, 1s a vertical section thereof on the line E-F, Fig. 6.A Fig. `8, isa detail elevation of one of the hanger supports `of Fig. 1. Fig. 9, is a vertical section on the line G-I-I, Fig.

' 8. Fi 10, is a top plan, and Fig. 11, an

edge e evation of one of the pitmen between an eccentric and a screen.

The invention particularly4 contemplates the provision of apparatus to rapidly handle said tracks or passageways.

the large output of coal from the mines and usually to receive the coal from a tipple, and screen and size such coal and deliver the same into railroad cars or other vehicles movable beneath the apparatus.

In the drawings, I show an apparatus in accordance with my invention arranged transversely of and above three sidin s, railway tracks, or vehicle passage ways B, C. ThisA apparatus comprises a permanent rigid supporting structure or framework composed of' a homogeneous mass or body of metal-reinforced concrete or equivalent material. This rigid frame work comprises a pair of spaced usually-parallel elongated longitudinal rigid' top side beams or walls 3, arranged in an elevated position above and transversely of the several tracks or vehicle passages A, B, and longitudinally inclined downwardly from their front ends toward their rear ends. These top side 4walls are designed to support the elevated longitudinally inclined shaker screens arranged in or above the open s ace'between sald top.

beamsv and longitudinally thereof. These top beams are supported by and connect the upper. ends of series of massive heavy vertical side columns l, l, 1*),gradually decreasing in height from the high front end column 1, to the low rear end column 1'. Col-l umns of the opposite series are correspondingly arranged to form pairs of columns between the various tracks or passageways A, B, C. The several columns, (six in theparticular example illustrated) rise from ythe ground and are mounted on suitable foundations designed to properly carry the great Weight of the structure. For instance, I show each column rising from a base 5, with said bases and the lower ends of the opposite side columns bound together and rigidly connected by horizontal cross webs 6, running parallel with and arranged between If so desired vertical upwardly extending corner `braces or enlargements 4", can be formed at the junctions between said webs and the side faces of the columns. vThe opposite columns 1a, also the opposite columns 1b, are tied` together at points intermediate their ends b v cross webs 7, arranged a distance above and parallel with the webs 6, and I preferably provide vertical'enlargements or braces 4", at the junctions between these webs and the Aside faces of the columns.

The upper portions of the two front end columns 1, are tied together by a horizontal cross web 9, extending between the inner faces of said columns and extended forwardly to constitute a forwardly and laterally projected floor or platform provided with supports or pillars 10, carrying the journal boxes for the shaker screen actuating shaft hereinafter more fully described. Vertical corner or angle braces 4c, can be arranged at and between the inner faces of the columns l, and the inner face of the floor 9. The upper parts of the columns of each side series ,are also rigidly tied and connected together` by horizontal longitudinal side webs, walls or connections 2, joining the side faces of said columns, and preferably located a distance below the longitudinal top side walls or screen supporting beams 3.

Vertically disposed corner or angle braces or enlargements 4, are preferably arranged above and below the webs 2 at the junctions between the same and'said columns, and also below the top side walls 3, at the junctions between the same and the columns. l prefer to provide the top elevated longitudinal screen-supporting portion the frame work with an approximately horizontal cantaliver extension or overhang projecting rearwardly from the rear columns 1b, over thetrack or passageway C, and virtually forming a longitudinal rearward continuation of the top side walls 3. This cantal-iver extension consists oflongitudinal side walls or beams 8,`

at their' outer ends rigidly tied and connected together by cross piece 14', so that the open space between the sides 8, forms a rearward longitudinal continuation of the space between the sides 3. The sides 8, are rigid with the rear end columns and join to the rear sides thereof and are braced and strengthened by the vertical ycorner braces 4, at the junctions between said sides` and columns and forming downward enlargements of said sides.

Foot ways, platforms, or running boards 13, are arranged throughout the lengths of the opposite side wallsor beams 3, and 8, projecting outwardly from the top longitudinal edges thereof and extending across the upper ends of the columns 1, 1h.. The cross portion 14, is preferably arranged horizontal and of sufficient width to form a transverse platform or running board connecting the rear ends of the opposite longitudinal platforms 13. These platforms are also formed of concrete in one piece or homogeneous with the sides and columns and having metal reinforcements joining and rigid with the metal reinforcements of connected or adjoining parts of the framework.

The framework described is composed of a homogeneous or singlek mass of concrete bound together throughout by metal reinforcements with massive columns as indicated for the purpose of providing a shaker mamas screen support of the necessary rigidity, mass and weight to absorb orovercome the vibrational effect or action of the shakerl screen or screens particularly when such screens are carried at the top of such an elevated structure as required forhandling a coal mine output andvdelivering the same to cars on railway tracks. By providing a concrete structure of approximately the arrangement disclosed, permanence, great rigidity and the necessary weight or mass are attained at minimum first cost and vat a minimum upkeep expense.

Shaker screen supporting pedestals, pillars or uprights 12, are arranged at intervals along the top sides 3, 8, and rise from the top edges thereof. These pillars 12, can be formed of concrete molded on and with the top walls 3, as shown in Figs. 1, 8 and 9. If so desired, metal brackets 12a, can be provided for this purpose as shown by Figs. 6 and 7. These brackets have flat basesitting on the top edges of the walls 3, and vertical flanges 39 fitting the vertical inner faces of said walls and the bracketsI are secured by vertical and Vtransverse bolts 38, extending through said walls and if so desired, embedded or molded therein.

The upwardly projecting bodies of the brackets carry the horizontal upwardly pro 9 jecting studs, spindles or journals 36, to receive the swingable links or hangers 27, that carry the shaker screens. Where the pillars 12, formed of concrete withthe walls 3, are employed, I usually provide xed transverse bushings or tubes 37, embedded in the concrete and receiving the studs, journals or spindles 36, for the screen links orl hangers 27. l

In -the particular example illustrated, l provide several superim osed screens arranged over and longitudinally of the space between the top walls of the frame work and carried by the hangers or depending links mounted on the vspindles 36, or 36a. The coal is delivered onto the front end of the top screen by a chute 21, usually depending from the coal tipple (not shown). This chute is adapted to receive the coal dumped from the mine cars, or .other conveyers, and discharge the same to thejshaker screens.

and carried by and moving with the intermediate screen 16. The screen 16, is arranged over and ldelivers onto a shaker or sizing pan 17, mounted independently of the screen 16, and reciprocating oppositely with respect thereto. This shaker 17 preferably carries the several chutes 17, 17", 17 c, arranged between the sides 2 and 3, and the columns 1, lb, and above the cross webs 7, and designed to deliver coal into vehicles arranged in the passage Ways A, B.

Material too large to pass through the perforations of screen 15, is discharged I show an upper screen 15, arranged above n from the. lower end of said screen onto a bar screen. 19, forming the extended lower end of the shaker or pan 17, and located between the cantaliver extension sides 8. Material too large to pass through bar screen 19, carried byV shaker 17, is Vdischarged from the rear end thereof and drops through opening 19, at the outer end of th'e canta-liver extension, and into the car or vehicle located in the trackway C or on a siding arranged in said space C. The material that passes through the bar 4screen 19, drops onto the chute 17 c, for delivery to the vehicle or railway car on siding` in .track way B.

- he material that passes through the perforations of screen 15, drops onto the screen 16, usually having smaller perforations than those of screen 15. Thematerial that passes through the `perforations of screen 16, drops onto the pan or shaker 17, for delivery, usually to chute 17, and consequently to a vehicle or car yon the siding in trackway A, although the shaker 17 nis usually provided with doors controlling the delivery of the material toeither chutes 17a or 17", and 17b discharges into chute 17C. The material that does not pass through the perforations of screen 16, dro-ps from the end of said screen onto the shaker or pan 17, for delivery to the chute 17 b.

The longitudinally-arranged reciprocatd'rymembers 15, 16, virtually constitute a single or unitary longitudinally inclined shaker member or element, and this element is carried by and arranged on fixed bottom ,cross bars 29, having projecting' opposite end journals extending transversely through the lower ends (if swingable hangers or suspension links 27, located beyond the opposite sides of said shaker element and between the same and the hanger supporting pillars rising from frame sides 3l and 8.

The part 17, constitutes the lower shaker v element, and this element is likewise supported by and provided with bottom cross bars 29a, having projecting opposite end journals extending transversely through of hangrrs arranged at different elevations to maintain said element longitudinally Tin .clined downwardly and rearwardly at they required angle. The lower'shaker element is shown supported by four pairs of similar suspension links arranged at the ends of the element and .uniformly spaced intermediate points, and the axes or points of suspension of the pairs of links are also arranged at different elevations to maintain said lower `element inclined at the required angle.

The hangers supporting the I several Shaker elements are preferably all of the same length between their bearings receiving the suspension journals and their bearings receiving the journals ofthe shaker elements, and a pair of hangers for the lower shaker element is located immediately below each pair of lhangers for the upper shaker element, so that each pillar rising from the frame sides 3, is provided with a pair of hanger suspension journals 36, (or 36a) arranged in the same vertical plane and spaced a ldistance apart vgreater than the length of a hanger. Each hanger is formed with a transverse bearing at its upper end to receive and turn on a fixed suspension journal 36 (or 36a) and with av transverse bearing at its lower end to receive and turn on the shaker-element-supporting journal of a cross bar 29 (or 29a). If so desired, the hangers can be provided with roller bearings to receive said journals. l

I prefer to make all of the hangers alike and interchangeable, and if so desired, each vhanger c an be composed of a pairy of similar longitudinal sections 34, :1s-shown by Fig. 5,v longitudinally abut-ting at their intermediate portions and rigidly yet removably clamped together by transverse bolts 34. Each sect-ion is formed at its opposite 'ends with half journalY boxes or bearings, and with an exterior intermediate longitudinal stifl'ening rib. However, I do not wish to limit all features of my invention to any particular suspension link or hanger construction. l

vSuitable lmeans are provided for simul-v l taneously, uniformly and oppositely reciprocating or oscillating the upper and lower shaker screen elements. .For this purpose, I show a horizontal rotary shaft 26, arranged transversely of theframe work, and in the present instance, loca-ted in'front :of columns 1, and carried by boxes on the sup- .ports10, rising from t-he platform 9. This shaft is provided with driving pulley 23, and at its intermediate portion opposite-.the open space between the columns 1, is provided with one or more pairs of-oppositely arranged eccentrics 24, 24a. Each eccentric y24..is operatively connected by a pitman 22,v

to the front end of the upper shaker screen element` while each oppositelyarranged eccent1-isis operatively connectedby'a pitman 22a, with the front end of the lower shaker element.- "3 Y The .arrangement of the eccentrics and pitmen is such that the opposite pitmen and consequently their respective shaker elements are always moving in opposite directions with a consequent tendency to equalize the thrust on the eccentric shaft. Each pitman preferably consists of a connecting rod or bar 22", at the front end rigidly bolted to thestrap of its operating eccentric, and at its rear end directly and rigidly bolted 'to the front end of the shaker screen element vibrated thereby, vapproximately as shown by Figs. 10 and 11. This connecting bar'22", is preferably composed of a 'comparatively wide length kof tough strong wood reduced in vertical thickness at 22e, usually near its rear end portion to provideqthedesired verof vibration required to propel the lading v along the screen.' The hangers or suspension links of the screen are the pendulum rods and the screen and its vlading' constitute the weight of the pendulum, and hence I provide suspension links of such length as to produce a pendulum that when swinging freely .will have a rate of swing approximately the same as the rate of vibrationrequired to move the lading along -the screen.

A shaker coal screen must vibrate at the rate of approximately one hundredand ten to one hundred and twenty swings per minute, more or less, to keep the screen \clear and insure a maximum delivery of wet run of the miner coal. I provide suspension hangers 4 or links approximately six inches in length so that in thc particular example referred' to the screen and links constitute a pendulum that will swing naturally or freely at approximately the rate of ninety, swings or vibrations per minute with gravity acting to stop and start the screen at the ending and beginning of each stroke. Now in order to increase this natural pendulum rate of swing to a rate of approximately one hundred and ten to make the screen clear itself of lumps or pieces of lading tending to catch in the screen open- .,ings and to overcome friction, I provide the rotary drive shaftwith eccentric connection to the screen and rotate this shaft just enough faster than said natural pendulum rate of swing, to slightly increase the rate of movement of the screen as required. For instance, in the example illustrated, I employ a shaker screen seventy two inches' wide, suspended. by pendulum rods (hangers or links) six inches long, forming a Apendulum having a natural or free rate of vibration or swing of approximately ninety per minute, and I couple this-screen to eccentrics having approximately` a four inch stroke, and I drive the eccentrics at a rate slightly! in excess of ninety* strokes per minute so as to bring the rate-of vibration of theJ screen up to approximately one hundred and ten per minute. A With such a shaker screen arrangemen T am able to separate wet run of minecoal into several grades or sizes at the rate of approximately two hundred to two hundred and fifty tons per hour with a power consumption of only approximately six horse power. This result is attained because of the true pendulum suspension of the screens whereby the action of gravity is mainly relied on to stop and start the screen at the ending and beginning of each stroke, and shock and jar is eliminated to such an extent as to enable me to employ-the direct pitman connection from eccentric toscreen embodying the bar having a thin or reduced flexible portion to allow the extensive up and down or vertical movement of the screen due to the short radius on which it swings. Also by employing this short true pendulum suspension and the consequent extensive vertical movement of the screen, the transmissionof shock and vibration toy the supporting frame work is reduced to the minimum, as well as shock and wear on the actuating mechanism.

By 'employing' the framework substantially as disclosed, supporting the shaking screen elements in the elevated exposed positions, all parts of the screening surfaces are readily accessible. The walk ways or runping boards 13, are arranged at the top portions of the side walls and the operators f'attendants can stand on and move along these boards so as to easily reach any part of the screens and screen surfaces to manipulate the lading and to observe the operation thereof. This feature of easy access to all .parts of the screening surfaces is of great importance in the operation of shaker screens of large capacity.

My peculiar suspension system might be employed in connection with a single screen and in connection with screens supported by frameworks of any other construction and material than herein described.

It is also evident that various modifications and departures might be resorted to without departing from the spirit and scope of my invention and hence I do not wish to limit myself to the exact disclosure hereof.

What I rclaim` isz- 1. In combination, alongitudinally inclined shaker screen having pairs of opposite laterally projecting journals, a supporting frame having pairs of oppositescreen supporting fixed journals parallel with said first mentioned journals, said pairs of fixed journals being progressively arranged in 'different horizontal planes, shortv suspension links yall of the same length 'and having bearings mounted on said fixed journals and bearings receiving said screen journals, said links supporting said screen and in connecfion therewith forming a pendulum having a natural rate of vibration slightly less than the. rate of vibration necessary to feed the lading over the screen, an operating shaft havlng an eccentrlc operatlng connecticn to said screen.

Znln combinatiom' oppositely-arrangedv side supports provided with laterally projecting studs, a lshaker screen, short suspension links all of .the same length and depending from androtatable on Isaid studs and depending at the sides ofthe lscreen and pivotally joined theretof on transverse axes to support the screen and its lading5 certain-of said studs arrangedatdierent elevations to maintain said screen longitudinally inclined, said screen and links constituting a pendulum having a natural rate of swing" slightly less lthan the rate of screen vibration necessary to .feed` the lading thereover, and means vfor swinging said screen to slightly increase said'najtural rate of vibration of such pendulum lto the rate necessary to feed the 'lading thereover,

substantially as described.

3. An elongated longitudinally inclined. shaker screen, short swinging suspension llinks carrying said.`sc}'een and in connecral rate of vibration approximately suiiicient to feed the lading downl the screen,- and operating means applied to vsaid screen for increasing theV rate of vertical throw 'thereof to clear the screen openings of lading tending. to catch therein, substantially as described.

5. The method of feeding material along a shaker screen having a natural rate of `vibration approximately suicient to feed the 'material down the screen and describing a path of movement the same las that described by a short pendulum, which consists in increasing said natural rate of vi- Bration of the screen to increase the rate of vertical .throw thereof, substantially as described.

ln testimony whereof I affix my signature in presence of two witnesses.

' OLUF Gr. PETERSEN.- Witnesses:

N. L. BiRNEm-'f A. H. DAVIS. l

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