The material as excavated by the buckets is dumped into a hopper, and from this hopper is fed to revolving or shaking screens. The power to drive the bucket line is applied at the upper tumbler through gears. The buckets pass over tumblers at the upper and lower ends of the ladder. The lower end of the ladder is suspended by cables, which pass over sheaves to a drum on a winch, so that the ladder may be raised or lowered to feed the buckets. The upper end of this ladder is hinged on a gantry frame about 20 ft. The favourite type of bucket dredge is that known as the endless chain centre bucket dredge.Īn endless chain of buckets is carried on rollers resting on a steel ladder. The principle and system of raising material in these machines are almost identical with those of harbour dredges.
The bucket dredge may be described as a continuous dipper dredge, the material being raised by a revolving chain of dippers or buckets, which scoop or dig into the deposit.
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