Shaker screen

Abstract

A screening basket has one or more screen decks and has upright side walls integrated with cross beams. A side beam, at approximately the center of gravity of the basket, is integrated with each of the side walls as well as with the cross beams to provide a unitary, rugged basket capable of vibratory movement on a support frame. A pair of cross shafts extend transversely of the screening basket and project beyond the side walls. These shafts are journaled in the side beams and have one projecting end geared together for opposite rotation. These projecting ends carry eccentric weights of different mass to provide an oval vibratory stroke of the screening basket upon rotation of the shafts. Adjusting mechanism is provided to adjust the relative position of the weights on the shafts to vary the angle of stroke. These weights are arranged to receive auxiliary weights to vary the amplitude of vibratory stroke as well as the shape of the stroke. The screen decks include tensioning clamp mechanism on at least one end which also is adjustable for lateral alignment with the screening. The screen decks preferably comprise at least two sections with end and intermediate tensioning clamp mechanism. These screen sections are supported on cross beams in turn supported on end bars pivotally mounted centrally thereof to the side walls of the basket to conform precisely to the contour of the underside of the screen.