FIELD: mining.
SUBSTANCE: invention refers to hydraulic mechanisation and can be implemented at development of placers of minerals of high density in underwater working faces. The scraper-suction screen of the dredger consists of a pipeline and of a suction head with the screen. The screen contains a rigid disk with radial slits and a central impermeable circle. Each radial slit is connected to the suction head with a leak proof channel of alternate shape in cross section, also total area of radial slits does not exceed area of cross section of the suction head. The suction head is equipped with a rotation drive. Scraper blades with cutting edge and stiffening ribs set off relative to axes of radial slits at angle of 20-25° are assembled on the rigid disk below between radial slits.
EFFECT: increased efficiency of development of placer sands and reduced losses of valuable components of high density.
3 dwg
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