The invention relates to a device for sorting particulate materials of different grain size that can be part of a construction machine or digger's scoop. The device for sorting has a plurality of helical rollers, each exhibiting at least one helix, wherein each helical roller rotates about a rotary axis of its own, at least two adjacent helical rollers exhibit the same direction of rotation, and the rotary axes of at least three helical rollers are not arranged in a common plane. At least some of the helical rollers are held and rotatably mounted exclusively at one end.

A disc assembly with a substantially rigid disc core includes a first section removably attached to a second section and mounted to a disc screen shaft. The disc core includes a transport surface extending between a left side of the disc core and a right side of the disc core, and a replaceable coating of textured wear material is deposited along the transport surface.

A disc assembly with a substantially rigid disc core includes a first section removably attached to a second section and mounted to a disc screen shaft. The disc core includes a transport surface extending between a left side of the disc core and a right side of the disc core, and a replaceable coating of textured wear material is deposited along the transport surface.

A separating screen conveyor for sorting a material into fractions having different distributions of a property of the particles or items. The conveyor screen has a row of shafts mutually spaced in a conveying direction, each shaft carrying a row of axially spaced discs for intermittently urging material on the sorting conveyor upward and in the conveying direction. The discs are releasably clamped to the shafts which have strips oriented in longitudinal direction of the shafts on circumferential surfaces of the shafts. The strips have toothed surfaces. Openings of the discs each have a recess closely fitting to the strips and teeth in engagement with the teeth of the toothed surfaces of the strips. The pitch of the teeth of the strips is smaller than the maximum widths of the discs in the longitudinal direction of the shaft.

A separating screen conveyor for sorting a material into fractions having different distributions of a property of the particles or items. The conveyor screen has a row of shafts mutually spaced in a conveying direction, each shaft carrying a row of axially spaced discs for intermittently urging material on the sorting conveyor upward and in the conveying direction. The discs are releasably clamped to the shafts which have strips oriented in longitudinal direction of the shafts on circumferential surfaces of the shafts. The strips have toothed surfaces. Openings of the discs each have a recess closely fitting to the strips and teeth in engagement with the teeth of the toothed surfaces of the strips. The pitch of the teeth of the strips is smaller than the maximum widths of the discs in the longitudinal direction of the shaft.

A self cleaning collecting apparatus and method are provided for the collection of seafloor material. The collecting apparatus, which operates on a seafloor, has a plurality of rotating discs in front of a slurry suction pipe with clearing members located between adjacent discs. Any oversize material lodged in the discs during collection is dislodged by the one or more clearing members and prevented from entering the slurry suction pipe, thus preventing blockages caused by oversize material congesting the slurry suction pipe.

A self cleaning collecting apparatus and method are provided for the collection of seafloor material. The collecting apparatus, which operates on a seafloor, has a plurality of rotating discs in front of a slurry suction pipe with clearing members located between adjacent discs. Any oversize material lodged in the discs during collection is dislodged by the one or more clearing members and prevented from entering the slurry suction pipe, thus preventing blockages caused by oversize material congesting the slurry suction pipe.

A screen device for sorting screening material into one or more fine grain fractions and one or more oversize grain fractions. The screen device includes a frame and a roller screen including screen rollers which are arranged, such that they can be rotary-driven about a roller axis each, next to each other and which are supported on the frame and which each comprise a roller body and one or more screen structures which protrude radially relative to the roller body. There is a fine grain screen gap between the roller bodies of respectively adjacent screen rollers, through which a fine grain fraction falls, while an oversize grain fraction is conveyed on the roller screen in the axial direction of the rollers when the screen rollers are rotary-driven. The roller body of at least one of the screen rollers widens radially in the axial direction of the rollers in an axial widening portion and the width of the fine grain screen gap which the widening roller body forms with the roller body of an adjacent screen roller decreases in the axial direction of the rollers along the widening portion.

A screen device for sorting screening material into one or more fine grain fractions and one or more oversize grain fractions. The screen device includes a frame and a roller screen including screen rollers which are arranged, such that they can be rotary-driven about a roller axis each, next to each other and which are supported on the frame and which each comprise a roller body and one or more screen structures which protrude radially relative to the roller body. There is a fine grain screen gap between the roller bodies of respectively adjacent screen rollers, through which a fine grain fraction falls, while an oversize grain fraction is conveyed on the roller screen in the axial direction of the rollers when the screen rollers are rotary-driven. The roller body of at least one of the screen rollers widens radially in the axial direction of the rollers in an axial widening portion and the width of the fine grain screen gap which the widening roller body forms with the roller body of an adjacent screen roller decreases in the axial direction of the rollers along the widening portion.

Screen for separating solid residues, and in particular for separating sheet or expanded material, such as bags or parts of bags made of plastic, polystyrene, spongy material or another light material, which comprises a separation station (10) interposed between the inlet port (P1) and the outlet port (P2) of the screen above its screening surface (P) and preferably after the powders and the lightest portions have already been separated. The station (10) comprises a hood (11) delimiting a suction chamber (13), and insufflation means (15) for orienting at least one lifting air flow (16) in the suction chamber (13) at the screening surface (P). The lifting air flow (16) is oriented for forming a vortex (17) confined in said suction chamber (13) and with rotation axis (Z) orthogonal to the screening surface (P) capable of lifting the sheet material and delivering it to suction means (18) associated with the hood (11).