Abstract: A vibrating screen unit for dewatering dredged material. The vibrating screen unit includes a frame and a top screen deck, a middle screen deck and a bottom screen deck. The middle screen deck includes a splitter which extends across the width of the frame and comprises alternating closed channels and screen rows which alternate across the width of the frame.

Abstract: A vibrating screen apparatus capable of maintaining operation when in an out-of-level orientation is disclosed. The apparatus includes a generally rigid frame having first and second sidewalls and top and bottom screen decks extending therebetween. The frame is coupled to a stationary chassis or base by spring mount assemblies that each include an adjustable spring support system coupled to the frame and heavy coil springs which are positioned between the adjustable spring support system and the stationary base. Four rubber shear spring assemblies are also coupled between the stationary base and the sidewalls. The rubber shear spring assemblies help prevent shifting of the frame relative to the base if an out-of-level condition occurs and also help reduce lateral forces applied to the coil springs caused during out-of-level conditions. The apparatus further includes eccentric drive and driven shafts that are rotatably supported by spherical roller bearings.

Abstract: A vibrating screen apparatus includes a frame and a screen having a first end coupled to an anchor beam which is rigidly coupled to the frame. The apparatus also includes a tension control assembly coupled to a second end of the screen for tensioning the screen to substantially a predetermined tension. The tension control assembly is rotatably coupled to the frame spaced apart from the anchor beam. The tension control assembly changes the tension of the screen upon rotation of the tension control assembly relative to the frame about an axis of rotation. The apparatus further includes an adjusting mechanism for moving the tension plate in a direction normal to the axis of rotation of the tension plate to compensate for nonuniform tension of the screen.