US2212550A - Screening apparatus and the like - Google Patents

Description

Aug. 2 7, 1940.

SCREENING APPARATUS AND THE LIKE Filed July 22, 1956 s Sheets-Shed 1 .I z I g0 20a 5 .fnveni or' W. J. PARKS 2,212,550

A118. 1940- w J PARKS SCREENING APPARATUS AND THE LIKE 5-.Sheets-Sheet 2 File July 223936 Aug. 27, 1940. w J PARKS 2,212,550

SCREENING APPARATUS AND THE LIKE Filed July 22, 1936 5 Sheets-Sheet 3 J0 I 10 J4- Invenibr Aug. 27, 1940. w. PARKS 2,212,550

SCREENING APPARATUS AND THE LIKE Filed July 22, 1936 5 Sheets-Sheet 4 Aug. 27; .1940.

w., J. PARKS SCREENING APPARATUS AND THE LIKE 5 Sheets-Sheet 5 Filed July 22, 1936 fi v %2 Patented Aug. 21, 1940 UNITED STATES PATENT OFFICE This invention relates generally to certain new and useful improvements in screen machines or apparatus for use in connection with the screening of materials and like operations but more particularly to the gyratory type of screen machine wherein the gyrating screen body is mounted on or stabilized by resilient means.

One of the objects of the invention is to provide a resilient supporting means for the gyrating bodies of machines of thischaracter which is so designed and constructed as to be economical and eificient and structurally sound and durable.

Another object is the provision of a screening machine having a plurality of gyratory screen bodies operatively connected with a unitary actuating mechanism for positively gyrating such bodies and wherein resilient means are provided for supporting the screen bodies and actuating mechanism in such a manner as to provide proper constraint and stability for such parts.

Other features of the invention reside in the construction and arrangement of parts hereinafter described and particularly pointed out in the appended claims.

In the accompanying drawings:

,Fig. 1 is a side elevation of the screening apparatus embodying my invention. Fig. 2 is a top plan view of the same. .Fig. 3 is an enlarged fragmentary cross section taken in the plane of line 33, Fig. 2. Fig. 4 is an enlarged transverse section taken on line 4-4, Fig. 1, showing one of the, resilient supports or mountings of the screen body. Fig; 5 is an enlarged cross section taken on line 5-5, Fig. 3. Fig. 6 is a sectional elevation of a modified form of resilient mounting. Fig. V7 is a side elevation of a modified form of screening apparatus embodying a plurality of gyratory screen bodies. Fig. 8 is a top plan view thereof. Fig. 9 is an enlarged fragmentary cross 40 section taken on line 9-9, Fig. 8. Fig. .10 is an enlarged transverse section taken on line Ill- 40, Fig. 8. Fig. 11 is a cross .section taken on line ll-l I, Fig. 10. Fig. 12 is a detached diagrammatic side elevation of the drive or crank shaft 45 of the screen shown in Fig. 9. Fig. 13.is a diagrammatic perspective view thereof. Fig- 14 is a diagrammatic view showingthe disposition of the eccentric centers of such crank shaft. Fig. 15 is a transverse section of a modified form of the mounting shown in Fig. 10. Fig. 16 is a cross secshown in connection with an apparatus for screening materials, and in the embodiment thereof shown in Figures 1-5, inclusive, l5 indicates the stationary base or supporting frame which may consist of channel rails mounted on appropriate supports, and I6 the screen body or 6. live frame which is freely or resiliently suspended from the base and to which a gyratory motion is imparted for effectually screening the materials delivered thereto.

Adjacent its ends and at opposite sides thereof, 10

the screen body It is supported from the base tion of the screen body is also accompanied by a shear displacement in the rubber member. Each of these rubber members is provided on its oppo-. site faces with parallel attaching plates 68, the rubber member being cured thereto to form a substantially unitary structure. Each of these rubber units or assemblies is secured at one side to a bracket 19 attached'to the supporting frame. i5 and at its opposite side to a bracket 20 secured to the adjoining side wall of the gyratory screen frame It. In the preferred form of each rubber mounting, as clearly shown in Fig. 4 two rubber units are employed, these units being disposed laterally of the machine in alined or end to end relation and with their axes-inclined in opposite directions and. disposed obliquely to the horizontal. By. the inclined disposition of the rubber members ll, when a load is placed on the screen body it, the displacement results ina compression force acting on the rubber and squeezing it between the attaching plates IS. The greater the load, the more the displacement and the greater the compression force within the safe load of the mounting. This compression 'force acting 'between the rubber and its attached plates increases the allowable unit shear stress at this point and increases the safety c J the unit.

This angularmounting is particularly desirable from a safety standpoint inasmuch as the bond between the rubber and isteel is weakened in tension, strongest in compression and intermediate in shear strength. By the mounting shown and described, the compression force introduced prevents a tension stress in the bond within any deflections encountered in the use of the machine, 8

because any downward displacement of the outer housing results in a compression of the rubber between the steel platesfthereby increasing its load-carrying ability. In addition, this compression stress is small for the amplitude of gyration of the machine and so does not affect its smooth operation in machines where such smoothness depends on equal and opposite reactions being developed in these resilient units, such for example as the machine shown in Fig. 1. With the shear rubber mountings the least change of volumes in the rubbers will take placefor a given displacement of the load, and there is provided a flexible mounting which is efiicient and economical. Furthermore by the dual mounting shown, the compression component of the force exerted by the rubbers as they are deflected balance each other and thereby reduces the necessity of heavy bracing for the supporting frame.

'If desired, and as shown in Figs. 4 and 5, the

brackets may be shaped to form housings or casings for the rubber mountings l1, l8.

In the screening apparatus to which I have. applied my improved shear mountings, the screen body I5 is supported for gyratory movement on a transverse driving shaft 2| which passes through the side walls of said body and which is supported at its ends in free-floating fashion in companion, resilient gyratory supporting bodies 22. This drive shaft is provided adjacent its opposite'ends with offset crank portions or eccentrics 23, 24 which are preferably of equal magnitude and 180 degrees apart. As shown in Fig.. 3, the inner crank portion 23 engages a corresponding roller I or like bearing 25 fitted in the adjoining side wall of the screen body while the outer crank portion 24 engages a like bearing 26 fitted in the companion supporting body 22. At one end the shaft 2| is provided with a pulley 21 for drivin connection to a source of power. Also mounted on this shaft arecounterweighted fly wheels 28.

The gyratory supporting bodies 22 for the drive shaft 2l are resiliently supported on the stationmy base in the same manner as the screen body l5, that is, by rubber mountings I'I' disposed in shear and attached to brackets I9 secured to the base l5 and to brackets 20 secured to or constituting'a Partof the ends of the gyratory bodies 22. V In the modified form shown in Fig. 6, the shear rubbers consistof annular members or rings 23 cured to like-shaped fittings or attaching rings 30, 3|, the fitting 30 being secured to a bracket 32 attached to the supporting base l5 of themachine and the fltting 3| being applied to the ends of a spacing bar or rod 33 extending transversely thru=the screen-body l5. It will be noted that the annular rubber rings 29 are disposed in pairs with one at each side of the bracket 32 and that the screen body is carried by these rubbers in shear.

In Figs. 7-14 inclusive, 1 have shown a screening machine embodying a plurality of gyratory screen bodies; 34, 35 actuated by a common drive, shaft 35 extending transversely through such bodies and supported atits opposite ends in free- .floating fashion in companion, resilient supporting bodies 31, similar to those indicated at 22 in the first-described machine. In this case, however, the drive shaft is provided adjacent its'ends with'threeofl'set crank portions or eccentrics 38,

' 33 and 40 which are of equal magnitude and 120 degrees apart, with the masses of the gyratory bodies and 'counterweighted balance wheels,as and when necessary,

of resilient mounting gyratory housing 51 with so proportioned that the self-determined axis of revolution is equidistant fromthe center of each crank or eccentric. As shown in Fig. 9, the crank portion 38 engages a corresponding roller orlike bearing 4i fitted in a bearing housing 42 applied to the adjoining side 5 wall of the lower'screen body 35 which is disposed below the drive shaft 36; the crank portion 39 engages a similar bearing 43 fitted in a bearing housing 44 applied to the adjoining side wall of the upper screen body 34 which is disposed over 10 the drive shaft; and the crank portion 40 en-' gages a like bearing 45 fitted in the companion supporting body 31. At one end the shaft is provided with a drive pulley 46 and adjacent each end with counterweighted fly wheels 41. It will 15 be further noted from Fig. 9 that the side walls of the respective screen bodies are in vertical alinement or in acommon plane and suificient space is provided between the opposing edges of these side walls, as seen in Fig. 7, to allow for 20 the gyrating movements of these screen bodies.

The screen bodies 34, 35 and the gyratory supporting bodies 31 are resiliently supported by rub ber in shear in the same manner as described in the previous construction, suffice'it to say that, 25 as shown in Fig. 11, the rubber mountings have their rubber members 48 disposed horizontally and attached to brackets 49 and 50 secured to the supporting frame 5| and screen bodies, respectively. Likewise, the supporting bodies 31 80 are carried by rubbers in shear and are indicated generally by the numerals 52, being identical in construction to those of the supporting bodies 22. This arrangement of parts reduces the loads on the screen bearings over those the eccentric bearings would have to hear .if both screen bodies were a unit and carried by one pair of bearings. From the foregoing screen arrangement, it is to be understood that any other combinationof eccentrics could be used at other regular angular do so that the attaching plates 54 and 55 are'dia- 50 metrically displaced rather than in alinement. When this mounting is placed in the machine, the attaching plates are vertical and the rubber member extends obliquely from one plate to the other. In other words, assume plate 54 being at- 55 tached to the fixed bracket 56 with its face vertical and the companion plate 55 attached to the its face vertical and parallel to that of 54. Then the oblique molding or disposition of the rubbenwith its central axis at an oblique angle to the faces of the plates, will elevate plate 55 above-plate 54, as shown.

-If a load be imposed. on the mounting through the housing-bracket 51, then the unit will deflect. This deflectionwill shorten the length of the rubber member on a line parallel to its central axis, and thus introduce a compression force similar to that of the angular mountings of Fig. 4. This tween the rubber and the steel. This mounting has the advantage that during gyration of the parts, the attaching plates 54, 55 move parallel to each other with all points of their faces in a vertical plane parallel to the movement of the machine, and thus no unbalanced compression forces exist when used on a. machine of the type shown in Fig. 1, where the smoothness of operation is,. to a considerable extent, determined by the equal and oppositely directed reactions in the resilient units.

I claim as my invention:

1. In a machine of the character described, a vibratory body, a supporting frame, a drive shaft for said body extending transversely there-, of between the ends thereof, connections between said shaft and said body for vibrating the latter in planes perpendicular to the shaft-axis, and

- rubber members disposed at opposite sides of the shaft-axis, and mounted in shear laterally between said frame and said body for normally sustaining said body in load-carrying position,

said rubber members having their periphery surfaces exposed and unrestrained and being displaceable in shearin planes at-right angles to atsubstantially right angles to said shaft to support the body in load-carrying position and adapted to be displaceable in shear in planes at right angles to the shaft-axis during vibratory movements of said body.

3. In amachine of the character described, a vibratory body, a supporting frame, a drive shaft extending transversely of said body, connections between said shaft and said body for' gyrating .the latter in planes perpendicular to the shaft-axis, and resilient means for supporting and stabilizing said body at opposite sides of said shaft consisting of rubbers mounted for displacement'in shear in planes at right angles to the shaft-axis and interposed between said supporting frame and said body with their axes extending generally transversely of such parts, and attaching plates to which-the opposite ends of said rubbers are cured to form substantially unitary structures, the peripheral surfaces of said rubbers being exposed and unrestrained and said plates being arranged at substantially right angles to the shaft-axis and secured to the supporting frame and the vibratory body, respectively;

4. In a machine of the character described, a

vibratory body, a supporting framg for said body, connections betw a drive shaft perpendicular .to the shaft-axis, and resilient means for supporting and stabilizing said body at opposite sides of said shaft consisting of rub- 11 \said shaft and said body for gyrating the latter, in planes ber units of substantially circularcross section mounted in shearand interposed laterally between said supporting frame and said body with their peripheral, surfaces free and unrestricted and with the axes thereof disposed in planes substantially parallel to the shaft and obliquely to a. stationary base, a pair of superposed vibratory the horizontal, said rubbers being displaceable' in shear at rightangles to the shaft-axis.

5. In a macmne of the character described, a vibratory body, a supporting frame, a drive shaft for said body, connections between said shaft and said body for gyrating the latter in planes at ing displaceable'in shear in planes at right angles to the shaft-axis.

6. In a screening machine, a vibratory screen body, a supporting frame, a drive shaft for said body, connections between said shaft and said body forgyrating the latter in planes perpendiculair to the shaft-axis, and resilient means for supporting and stabilizing said body at o'pposite sides. of said shaft consisting of brackets applied to said supporting frame and to said body,

respectively, in laterally spaced relation, and rubber members extending from opposite sides of said frame-brackets and disposed between and secured at their opposite ends to the companion brackets of the screen body, said rubber members being so constructed and arranged as to be displaceable in shear in planes at right angles to the shaft-axis.

7. In a machine of the character described, a

supporting frame, a plurality of resiliently-supported bodies, a drive shaft solely supported by said bodies, means for resiliently supporting said bodies and including rubber members mounted in shear and interposed laterally between said frame and said bodies and sustaining said bodies in load-carrying position while permitting gyration of the bodies in vertical planes, and connections between said shaft and said bodies for posi-;

tively gyrating them in paths lying in planes at right angles to said shaft.

, 8. In a machine of the character described, a

stationary base, a resiliently-supported gyratory body for treating materials, a drive shaft extending through said body, resiliently-supported gyratory bodies at opposite sides of the materials treating body and through which the drive shaft extends, said bodies constituting floating supports for said shaft, eccentric means on said shaft and engaging said bodies, respectively, for

gyrating them, and means for resiliently supporting said bodies in load-carrying position and permitting their gyration in vertical planes, each of said resilient supporting means consisting of rubber members mounted in shear and interposed between said base, and said companion body.

9. In a machine of the character described, a stationary base, gyratory bearing-bodies resiliently supported on said base,'a pair of superposed screen bodies independently resiliently mounted on said base 'between said bearing-' bodies, and adrive shaft journaled in said bearing-bodies and said screen bodies and extending between the latter, said shaft having eccentrics thereon angularly displaced at 120 degrees apart for gyrating said bearing-bodies and sa-id scr'een bodies about a self-determined axis lying-between the axes of said eccentrics.

l0. Ina machine of the character described,

bodies for treating materials having 'alining bearings, a drive shaft eng'aglng said bearings, connections between said shaft and said bodybearings for gyrating the bodies,-at 'planes at right angles to the shaft-'axis, and resilient means for supporting and stabilizing said bodies at opposite sides of said shaft and consisting of rub-

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