Patent ID: 6843376

Claim:
A mobile screening unit for screening bulk material, said screening unit comprising: an elongated mobile support frame having a longitudinal axis; a first screener mounted to the support frame and extending longitudinally thereon, the first screener having: an inlet for receiving bulk material containing large-sized, medium-sized, and small-sized particles, a first outlet for releasing large-sized particles, and a second outlet for releasing medium-sized and small-sized particles, the first screener being used for screening the bulk material along a first direction substantially parallel to the longitudinal axis of the support frame; a second screener mounted to the support frame and extending longitudinally thereon, the second screener having: an inlet for receiving medium-sized and small-sized particles conveyed from the first screener, a first outlet for releasing medium-sized particles, and a second outlet for releasing small-sized particles, the second screener being used for screening the medium-sized particles from the small-sized particles along a second direction substantially parallel to the longitudinal axis of the support frame; a feeding hopper mounted to the support frame for accumulating bulk material, the feeding hopper having an inlet for receiving bulk material and an outlet for releasing bulk material; a feeding conveyor positioned to receive the bulk material released from the outlet of the feeding hopper and convey the same in the first direction to the inlet of the first screener; and a transition conveyor mounted to the support frame and extending longitudinally thereon, the transition conveyor being positioned to receive the medium-sized and small-sized particles released from the second outlet of the first screener and convey the same in the second direction to the inlet of the second screener.