SCREENING APPARATUS
First Claim
1. A screening apparatus for releasably engaging a prime mover for movement along one side of an excavation, picking up excavated material from the one side of the excavation and processing the excavated material into padding material for placement into the excavation, the screening apparatus comprising:
- (a) a main frame having a pivotally mounted separator sub-frame, the separator sub-frame movable between a first angle of inclination and a different second angle of inclination;
(b) a lift conveyor connected to the main frame and including an endless conveyor belt for rotation about a lower roller and a spaced upper roller, the conveyor belt being substantially impervious to the passage of excavated material, the lift conveyor being inclined from a lower intake end to an upper discharge end;
(c) a shaker frame connected to the separator sub-frame by a plurality of coil springs or rubber bushings;
(d) a screen retained by the shaker frame, the screen having a convex configuration;
(e) a vibrator mounted to the shaker frame above the screen; and
(f) a transfer conveyor below the screen for receiving fines, passing through the screen, the transfer conveyor defining an arcuate belt path transverse to the lift conveyor.
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Accused Products
Abstract
A screening apparatus for processing excavated material from a ditch into fines and roughs is disclosed. The screening apparatus includes an inclined lift conveyor for moving the excavated material upward and depositing the excavated material onto a convex vibrating screen surface. A transfer conveyor having an arcuate belt path as disposed below the separator for introducing the fines to the excavation. The separator includes a reversible motor for providing a first vibration and a second vibration to the separator.
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Citations
14 Claims
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1. A screening apparatus for releasably engaging a prime mover for movement along one side of an excavation, picking up excavated material from the one side of the excavation and processing the excavated material into padding material for placement into the excavation, the screening apparatus comprising:
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(a) a main frame having a pivotally mounted separator sub-frame, the separator sub-frame movable between a first angle of inclination and a different second angle of inclination; (b) a lift conveyor connected to the main frame and including an endless conveyor belt for rotation about a lower roller and a spaced upper roller, the conveyor belt being substantially impervious to the passage of excavated material, the lift conveyor being inclined from a lower intake end to an upper discharge end; (c) a shaker frame connected to the separator sub-frame by a plurality of coil springs or rubber bushings; (d) a screen retained by the shaker frame, the screen having a convex configuration; (e) a vibrator mounted to the shaker frame above the screen; and (f) a transfer conveyor below the screen for receiving fines, passing through the screen, the transfer conveyor defining an arcuate belt path transverse to the lift conveyor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A screening apparatus for releasably engaging a prime mover for movement along one side of an excavation, picking up excavated material from the one side of the excavation and processing the excavated material into padding material for placement into the excavation, the screening apparatus comprising:
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(a) a main frame having an adjustable separator sub-frame; (b) a lift conveyor connected to the main frame and including an endless lift belt for rotation about a lower roller and a spaced upper roller, the lift belt being substantially impervious to the passage of excavated material, the lift conveyor inclined from a lower intake end to an upper discharge end; (c) a shaker frame connected to the separator sub-frame by a plurality of coil springs or rubber bushings; (d) a screen retained by the shaker frame and disposed in a convex shape; (e) a vibrator mounted to the shaker frame above the screen, the vibrator being reversible between a forward rotation and a reverse rotation, the forward rotation imparting a first vibratory motion to the screen and the reverse rotation imparting a second vibratory motion to the screen; and (f) a transfer conveyor below the screen for receiving fines passing through the screen, the transfer conveyor movable in a first transverse direction and an opposite second transverse direction. - View Dependent Claims (10, 11, 12)
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13. A method of screening excavated material into fines and roughs, the method comprising:
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(a) elevating excavated material along a lift conveyor; (b) passing the elevated excavated material from an upper end of the lift conveyor onto a screen having a convex surface; (c) vibrating the screen with a vibrator mounted above the screen to pass fines through the screen, the vibrator operable in one of a forward direction of rotation and a reverse direction of rotation, the forward direction of rotation imparting a first vibratory motion to the screen and the reverse direction of rotation imparting a different second vibratory motion to the screen; and (d) transferring the fines passing through the screen along an arcuate path on a transfer conveyor to discharge the fines at a position transverse to the lift conveyor. - View Dependent Claims (14)
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Specification