Implementations of mechanical screening systems may include a first trommel screen rotatably coupled within a second trommel screen, the second trommel screen including a first plurality of openings and a second plurality of openings, each opening of the first plurality of openings smaller than each opening of the second plurality of openings. The mechanical screening systems may also include an outer barrel coupled to the second trommel screen. The outer barrel may include a first slot opening and a second slot opening therein. The second trommel screen may be rotatable.

Implementations of mechanical screening systems may include a first trommel screen rotatably coupled within a second trommel screen, the second trommel screen including a first plurality of openings and a second plurality of openings, each opening of the first plurality of openings smaller than each opening of the second plurality of openings. The mechanical screening systems may also include an outer barrel coupled to the second trommel screen. The outer barrel may include a first slot opening and a second slot opening therein. The second trommel screen may be rotatable.

Separation and classification equipment for separating a mixed waste stream into first, second and third fractions. The equipment comprises a feeding member for feeding the waste stream toward a gap and a blower for discharging a stream of air for mixing with the waste stream, as the waste stream falls through the gap. The first fraction falls through the stream of air and collects in a first collection area while the stream of air carries away the second and the third fractions. A rotatable permeable member is arranged to permit the stream of air to pass therethrough and thereby force and retain the third fraction against a surface of the rotatable permeable member and be conveyed, by the rotatable permeable member, toward a third collection area while the second fraction tends to separate, from the rotatable permeable member and the third fraction, and collect in a separate second collection area.

A feed diffuser for use in a rotating screen having drain holes is provided, comprising a flow chamber having an upstream end and a downstream end and defining a flow path for a slurry having solid material larger than the drain holes flowing between the upstream end and the downstream end; the flow chamber having an intermediate portion disposed between the upstream end and the downstream end; the intermediate portion having a first opening; the flow chamber having an inclined floor, the lowest point of the inclined floor being adjacent to the first opening; whereby the inclined floor is sufficiently inclined such that when the slurry flows down the flow path, the larger solid material is directed towards the first opening.

A feed diffuser for use in a rotating screen having drain holes is provided, comprising a flow chamber having an upstream end and a downstream end and defining a flow path for a slurry having solid material larger than the drain holes flowing between the upstream end and the downstream end; the flow chamber having an intermediate portion disposed between the upstream end and the downstream end; the intermediate portion having a first opening; the flow chamber having an inclined floor, the lowest point of the inclined floor being adjacent to the first opening; whereby the inclined floor is sufficiently inclined such that when the slurry flows down the flow path, the larger solid material is directed towards the first opening.

The invention relates to an intelligent and adjustable boring and separating apparatus with a cage structure for sandy soil which includes a position-adjusting mechanism, a control and power mechanism, and a boring and separating mechanism. The control and power mechanism includes a sleeve, a spacer, a steering control mechanism, a rotating mechanism, and an annular baffle. The steering control mechanism includes a first motor, a connecting rod, and a steering wheel. The rotating mechanism includes a sliding plate, a second motor, a gear and an inner ring. The boring and separating mechanism includes a shaft, a baffle plate, a reinforcement ring, and a fixing ring. The intelligent and adjustable boring and separating apparatus with a cage structure for sandy soil has advantages of having reasonable and simple structure, easy to operate, high intelligence, able to remove all kinds of sandy soil, time and labor saving, and high practicality, which effectively solves the problem of poor practicality of existing sieving machines.

A rotating drum of a rotating drum-type workpiece cleaning device is provided with feed fins that extend helically along the inner circumferential surface of the drum body. The feed fins are, for example, fins in which metal sheets have been folded. On both sides of the feed fins, the angle of the internal corner between the feed fin and the inner circumferential surface of the drum body is an obtuse angle, for example, about 120 degrees. It is possible to prevent or limit the trapping of conveyed workpiece in the internal corner and trapping between adjacent fin sections.

A rotating drum of a rotating drum-type workpiece cleaning device is provided with feed fins that extend helically along the inner circumferential surface of the drum body. The feed fins are, for example, fins in which metal sheets have been folded. On both sides of the feed fins, the angle of the internal corner between the feed fin and the inner circumferential surface of the drum body is an obtuse angle, for example, about 120 degrees. It is possible to prevent or limit the trapping of conveyed workpiece in the internal corner and trapping between adjacent fin sections.

An air-inlet duct includes an outer wall, an inner wall, and a splitter. The splitter cooperates with the outer wall and the inner wall to establish a particle separator which separates particles entrained in an inlet flow moving through the air-inlet duct to provide a clean flow of air to a compressor section of a gas turbine engine.

An air-inlet duct includes an outer wall, an inner wall, and a splitter. The splitter cooperates with the outer wall and the inner wall to establish a particle separator which separates particles entrained in an inlet flow moving through the air-inlet duct to provide a clean flow of air to a compressor section of a gas turbine engine.