| 摘要 |
A dredge head (1) comprising two horizontally-mounted interlacing and counter-rotating archimedean-type screw (6) is moved into silt forming a sea bed (10). The screw (6) are driven so as to deliver a mixture of silt and water at a first pressure to the inlet of a piston pump (2) driven by a hydraulic piston-cylinder assembly (14) to discharge the mixture at a second pressure higher than the first pressure. The mixture is thus caused to flow through a discharge pipe (14) to a remote discharge point (15). The dump valve (5) is operable in response to a density sensor (3) to divert mixture from the discharge line (4) through a dump line (16) when the density of the mixture falls below a predetermined value. |
