Method and device for screening materials, such as aggregates and/or soils

A method for screening materials, comprising:

• driving a meshed screening deck upon horizontal eccentric shafts, where the meshed screening deck is driven by machine power eccentrically with respect to rotation axes bearing-mounted on a body, thereby forcing each point of the screening deck to revolve in continuous motion in the same rotational direction along a circular path, wherein all mass forces of structural components in revolving motion are balanced with respect to the rotation axes.

The method of claim 1, wherein driving the meshed screening deck includes maintaining the direction of the screening deck by having each point of the screening deck revolve along a circular path of the same size.

The method of claim 1, wherein the revolving motion speed of the screening deck is selected so that the material to be screened is thrown by the screening deck in the same advancing direction over each cycle as regarded in the direction of the screening deck's plane.

The method of claim 1, wherein driving the screening deck includes driving the screening deck in a revolving motion with the rotatable eccentric shafts, wherein the eccentric forces of the eccentric shafts are balanced with one or more counterweights, some of which are rotated along with the eccentric shafts and some of which are driven in the same revolving motion as the screening deck.

The method of claim 1, further comprising bringing the materials to be screened into a screening space defined by the body, wherein the screening space is restricted by flexible sealing boards that move along with the screening deck and whose top edges drag against immobile end panels.