Trommel screen with different sized apertures

A screening machine comprising:

• a rotary trommel screen having an overall length, the rotary trommel screen further having an inlet end and an outlet end, the rotary trommel screen defining at least a first screen section and a second screen section, the first screen section being configured to yield a first product, the second screen section being configured to yield a second product;
• a first collection area proximate to the inlet end and under the rotary trommel screen;
• and
• a second collection area proximate to the outlet end and under the rotary trommel screen, wherein the first and second collection areas are configured to collect a first and second product respectively, the first screen section and the second screen section corresponding to the first and second collection areas, the first screen section and the second screen section being configured such that a size of the first product is different than the size of the second product;
• and
• a first conveyor positioned longitudinally within the rotary trommel screen, wherein the first conveyor is selectively reversible and configured to move in a direction toward the inlet end of the rotary trommel screen or in a direction toward the outlet end of the rotary trommel screen, wherein the first conveyor includes a first end and a second end, wherein the first end and the second end are unobstructed to allow material to flow in a longitudinal direction along the first conveyor from either the first end or the second end,
• a second conveyor positioned to transport material collected by the second collection area, the second conveyer being configured to move material to a second discharge corresponding to the second collection area, wherein the first conveyor is positioned to transport material collected by the first collection area, the first conveyer being configured to move material to a first discharge corresponding to the first collection area;
• wherein the screening machine is configured so that the first product can be selectively collected at the first collection area or moved to the second collection area via the first conveyor, wherein, when moving in a direction toward the outlet end of the rotary trommel screen, the first conveyor moves material to the second conveyor.

A screening machine comprising:

• a rotary trommel screen having an overall length and an interior volume, the rotary trommel screen further having an inlet end, an outlet end, and a plurality of sections, the interior volume of the rotary trommel screen being substantially unobstructed between the inlet end and the outlet end;
• a trailer support frame supporting the rotary trommel screen, the trailer support frame including a plurality of wheels and axles and a hitching end, wherein the hitching end is configured to be attached to a towing vehicle for transport on public roadways;
• a power system mounted to the trailer support frame, the power system being connected to the rotary trommel screen for rotating the rotary trommel screen;
• a hopper mounted to the trailer support frame, the hopper being adjacent the inlet end of the rotary trommel screen so as to deliver material to the inlet end of the rotary trommel screen;
• a first collection area proximate to the inlet end and under the rotary trommel screen, wherein the first collection area corresponds to at least 65 percent of the overall length of the rotary trommel screen;
• a first conveyor positioned longitudinally within the rotary trommel screen and configured to transport material collected by the first collection area, the first conveyer being configured to move material to a first discharge corresponding to the first collection area;
• a second collection area proximate to the outlet end and under the rotary trommel screen, wherein the second collection area corresponds to the remainder of the overall length of the rotary trommel screen not corresponding to the first collection area;
• a second conveyor positioned to transport material collected by the second collection area, the second conveyer being configured to move material to a second discharge corresponding to the second collection area, and
• wherein the first and second collection areas are configured to collect a first and second product respectively, and wherein sections of the rotary trommel screen corresponding to the first and second collection areas are configured such that a size of the first product is different than the size of a second product.