| 摘要 |
A screening apparatus for grading particulate material comprising a grading screen (4) having apertures formed therein for water and/or undersize particles to pass through, the grading screen (4) being supported on a frame mounted on a chassis (2) via resilient linkages (18), the frame, and thus the grading screen (4) being vibrated by vibrating means, such as a pair of counter rotating rotors defining eccentric masses driven by one or more drive motors, to impart circular or reciprocating vibratory motion to the grading screen (4), the grading screen (4) being arranged at a predetermined slope whereby material to be graded can be delivered onto an upper end of the grading screen, typically entrained in a flow of water, while the grading screen (4) is vibrated by the vibrating means to convey the material over the grading screen and to cause undersize material and water to pass through the apertures of the grading screen, oversize material being discharged from a lower end of the grading screen (4) onto a conveyor or into a collection bay or hopper, a sump (26) being provided beneath the grading screen (4) for receiving under-sized material passing through the openings of the grading screen, a jet pump (32) being provided for conveying material from said sump (26) to a dewatering screen (8). |
