FIELD: hydraulic mechanization.
SUBSTANCE: invention can be used in mining placer deposits of high density in underwater faces. Proposed ripping-and-suction device or suction-tube dredger includes pipeline, suction head with screen containing rigid disk with radial slots and central impenetrable circle. Each radial slot is connected with suction head through sealed variable cross section channel. Total area of radial slots does not exceed area of cross section of suction head. Suction head is provided with rotation drive including intercoupled electric drive, safety clutch, reduction gear, propeller shaft and chain drive to rotate screen. Suction head is connected with pipeline of turnable insert with support adjustable in height to adjust tension of chain drive. Radial stiffening ribs are arranged get on rigid disk between radial slots, and ripping blades with cutting edge are located under stiffening ribs.
EFFECT: increased efficiency of mining placer sands, reduced losses of valuable high density components.
3 dwg
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