Roller device to separate particles of different grain sizes and forming machine to form gratings particles different layers.

摘要

Roller device to separate particles of different gradings from a free field (16) in form of chips, shavings, granules or fibers particularly but not exclusively wood-based, may be used the device in machines for separating and screening machines or for form layers and comprising a plurality of rotating rollers (11) disposed with the axes (11a) parallel therebetween to define a selection platform and can move the free material (16) in a direction substantially at right angles to the axes ( 11a) of the rollers (11), each roller (11) a cylindrical surface having a form that defines a plurality of circumferential points (12) arranged next to each other to define a plurality of circumferential grooves in a V (13), being arranged said tips (12) and grooves (13) substantially parallel to the axis of the screening platform, characterized in that the rollers (11) have at least a working position in which the ends (12) of a roller (11) are oriented slots V-shaped (13) of the adjacent roller (11) and penetrate thereof to define a discharge gap (18) for selecting particles between two adjacent rollers (11) with a development substantially zigzag, wherein each segment of said discharge gap (18) is inclined with respect to the axes (11a) of said rollers (11) which in at least some of the rollers (11) the lateral connecting surfaces (26) between the prongs (12) and grooves (13) are provided with vibrator means for applying a vibration to said free material (16), said vibrating means at least protuberances, protrusions, hollows or facets (23, 24, 25) so that said discharge gap zigzag (18) is at least partially irregular, even if its width is substantially constant.