US1798978A - Separator - Google Patents

Description

March 31, 1931. c;. D. FRANCISCO 1,798,978

SEPARATOR Filed Aug. 26, 19 26 Patented Mar. 31, 1931 UNITED STATES PATENT OFFICE GEORGE DLFIRANOISCO, OF COLUMBUS, OHIO, ASSIGNOR TO THE JEFFREY MANUFAC- TURING COMPANY, OF COLUMBUS, OHIO, A CORPORATION OF OHIO SEPARATOR Application filed Aug ust 26, 1926. Serial No. 131,755.

This invention relates to certain new and useful improvements in separators, and particularly to separators of the class wherein the materials to beseparated are placed upon a screen having apertures through which the fragments of relatively small dimensions may pass while the larger fragments move along the surface of the screen to be discharged over its end.

The especial object of this invention is to provide, in a separator of the class described, screens having both longitudinal oscillation and superimposed transverse vibration whereby the materials being separatedmay be propelled across and through the screen.

The means whereby I attain this object are fully set forth in the following specification and illustrated in the accompanying drawin of which Fig. l is a side elevation of one embodiment of my invention.

Fig. 2 is a plan view of the device illustrated in Fig.1 certain parts being broken away to reveal parts below.

Like numerals refer to similar parts in the several figures.

In the drawing the numeral 1 refers to a' supporting frame having the cap beams '2 from which depend the pendulum rods 3. Upon the pendulum rods 3 is supported the screen frame 4 composed of side members 5 and the bottom plate 6 which are so joined together that they ferm atrough along which the separated material may flow. A screen 7, formed of any preferred material, such as bolting cloth, wire mesh, perforated metal, or the like, is attached to the side members 5, in any preferred manner, and extends above the bottom plate 6 substantially parallel thereto. A spout 8 is so disposed that it may conduct the materials to be separated onto the surface of the screen 7, and spouts 9 and 10 are disposed in suitable relation to the screen 7 and bottom plate 6 respectively, to receive the materials discharged therefrom and conduct them away. The parts above described are preferably so arranged that the screen 7 and bottom plate 6 will have a relatively small downward inclination from the receiving to the discharge end.

Journaled in suitable bearings 11 which are attached to the supporting frame 1 below the upper end of the plate 6, is a transversely extending shaft 12 upon which are mounted a pair of similar eccentrics 13, each of which is connected by a suitable connecting rod 14 with the screen frame 4. J ournaled in suitable bearings 15 which are attached to the screen frame 4 intermediate its ends, is a transversely extending shaft 16 upon which is mounted a pair of similar unbalanced weights 17 positioned one adjacent each side of the screen frame. To the shaft 12 is fixed a relatively large pulley 18 connected by a suitable belt 19 with a relatively small pulley attached to the prime mover 20. In the pres ent illustration the prime mover 20 is represented as an electric motor, but any other source of rotative power suitable to the operation of the machine may be employed if desired. Fixed to the shaft 16 is a relatively small pulley 21 connectedby a suitable belt 22 with a relatively .large pulley 23 attached to the prime mover 20.

lVhen the fmotor 20 is-actuated, the shaft 12 .is driven at relativelylow speed, causing the eccentrics 13 'to i1npart to the screen frame 4 relatively slow. oscillations of relatively long amplitude in theWge'neral direction of the length of tlie'screen. i At the same time the shaft 16 is driven'at relatively high speed, and the rapid rotation of the unbalanced weights 17 tendsto move the screen frame in a circular path about the axis of the shaft .16. Unrestrainedlongitudinal movement in response to this tendency is prevented by the eccentric rods 14, but I have provided the springs 24 in the suspension rods 3, the resilience of which permits movement of the screen frame in directions perpendicular to its length. In consequence of this restricted mobility there is set up in the screen frame rapid vibrations superimposed upon said oscillations, in a direction perpendicular thereto.

The relatively small inclination of the screening surface prevents the tendency of unscreened material to avalanche across its surface. The longitudinal oscillation of the screen causes a large volume of material to ments would be strictly translational.

freely flow across its surface, while the'superimposed vibrations assist the finer particles to find and pass through the screen apertures.

It will be seen that broadly speaking I have provided a longitudinally extending material-receiving element with agitating means for imparting a complex movement thereto. The unbalanced weights have a tendency to impart an orbital movement to the materialreceiving element as a whole in vertical planes, that is to say, while said element tends to move always in planes parallel to its original plane any point on it tends to describe a circle. The eccentric and link tend in the first place to confine this orbital tendency to a substantially vertical movement, and in the second place to impart a substantially horizontal movement to the material-receiving element. If the screen frame or material-receiving element 4 were freely suspended and confined to verticalmovements, these move- It is obvious, however, that links'14 connected to the receiving end of the frame will prevent purely vertical movements in that this end of the frame will be constrained to move in an arc having the center of the eccentrics as its center. The resultant of forces is such that vertical movements of the receiving end of the frame are limited and are more or less In the nature of upward and rearward vibratory movements in an arc with the straps 13 as centers, due to the movements of the weights combined with the restraining action of the links 14 oscillating with the eccentric straps 13 as centers and a greater relative vertical throw is given to the discharge end which is substantially free. Consequently, the vertical movements of the frame progressively increase in amplitude from the receiv ing end of the frame to the discharge end.

This isof importance since the material when first delivered to the screen has a relatively large percentage of the fine ingredients which quickly pass through the frame under the primary influence of the vertical vibrations. As the material passes down the frame, however, the relative percentage of the fine ingredient diminishes, but the increasing amplitude of the vibrations serves to impart greater agitation to the material so that the fine ingredients may, be quickly worked down to and through the screen.-

a By the construction above described I have produced an improved separator of great capacity, high efliciency and extreme simplicity of design. It is to ,be understood, however, that I do not limit'myselfto the precise construction here shown, as the parts i may be subject .to wide modifications without de arture from the spirit of my invention.

at I claim is: '1. In a separator of the class described, the combination with a main frame,'of a plurality of longitudinally resilient pendula epending from said main frame, a screen supporting frame supported upon said pendula, a screen carried by said screen supportingframe in position to support a mass of materialsto be separated, a shaft rotatably mounted upon said main frame, an eccentric fixed to said shaft, means to connect said eccentric with said screen supporting frame adapted to swing said screen supporting frame upon said pendula when said shaft revolves, a shaft rotatably mounted upon said screen supporting frame intermediate its ends and transversely thereof, a pair of unbalanced weights attached to said shaft and adapted .to impart relatively fast vibration to said screen supporting frame when said shaft revolves and means to simultaneously revolve said shafts as and for the purpose set connection with the receiving end of said element, said link means confining said orbital tendency to substantially vertical movements of progressively increasing amplitude from- -the receiving end of said element to the .dis-

charge end, and means to reciprocate said link means to impart horizontal movements to said element.

In testimony whereof I have hereunto set m hand.

y GEORGE D. FRANCISCO.

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