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 and spaced below the discharge end;
(d) a screen fixed to the shaker frame, the screen having a convex configuration and disposed below the discharge end and receiving the excavated material passing from the discharge end;
(e) a vibrator operably coupled to the shaker frame; and
(f) a transfer conveyor below the screen for receiving fines, passing through the screen, the transfer conveyor passing about a first end roller and a spaced apart second end roller, wherein a length of a conveyor path intermediate the first end roller and the second end roller is lower than the first end roller and the second end roller thereby defining an arcuate belt path transverse to the lift conveyor.
0 Assignments
0 Petitions
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.
23 Citations
16 Claims
-
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 and spaced below the discharge end; (d) a screen fixed to the shaker frame, the screen having a convex configuration and disposed below the discharge end and receiving the excavated material passing from the discharge end; (e) a vibrator operably coupled to the shaker frame; and (f) a transfer conveyor below the screen for receiving fines, passing through the screen, the transfer conveyor passing about a first end roller and a spaced apart second end roller, wherein a length of a conveyor path intermediate the first end roller and the second end roller is lower than the first end roller and the second end roller thereby defining an arcuate belt path transverse to the lift conveyor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 15)
-
-
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:
-
(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 coupled to the separator sub-frame; (d) a screen retained by the shaker frame to be disposed below the discharge end to receive the excavated material passing from the lift conveyor 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, 16)
-
-
13. A method of screening excavated material into fines and roughs, the method comprising:
-
(a) elevating excavated material along a lift conveyor having a conveyor belt substantially impervious to the excavated material, the conveyor belt having a path length with a cross section defined by a pair of opposing edges being higher than a central portion of the conveyor belt; (b) passing the elevated excavated material from an upper end of the lift conveyor onto a screen having a convex surface, the screen fixed relative to a shaker frame; (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)
-
Specification