| 摘要 |
FIELD: hydraulic excavation. ^ SUBSTANCE: invention can be used at mining placer deposits of large density in underwater mines. Proposed dredger suction device consists of suction head with ring screen provided with rigid disk with radial slots of sector-ring shape formed by rigid nonpermeable sectors and central nonpermeable circle. Each radial slot of sector-ring shape is connected with suction head by variable cross-section hermetic channel, and total area of radial slots of sector-ring shape does not exceed area of cross-section of suction head. ^ EFFECT: increased efficiency at mining placer deposits, reduced losses of valuable components of high density. ^ 3 dwg
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