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Title:
AUTOMATIC CONTROLLER FOR DRAG HEAD DEPTH
Document Type and Number:
Japanese Patent JPS58176326
Kind Code:
A
Abstract:

PURPOSE: To enhance the efficiency of dredging work by a method in which on the basis of a control signal generated according to the difference between detection signal from a depth meter provided to a drag head and a set depth signal, the drag head is driven to perform dredging work for a necessary part.

CONSTITUTION: When a drag head 1 moves in the direction of arrow (m) and enters a soil and sand part 3' below a set depth 4 beyond the lower limit value L, the deviation becomes minus(-). Accordingly, after the lapse of time 2, a winch is wound up at low speeds, and the drag head 1 is lifted up and stopped at the point C. When the draft of a dredger is incrreased and the drag head 1 reaches the point D, the deviation becomes minus(-) again, and thereby the winch is wound up until the depth 4 is reached. When the draft of the dredger is reduced and the drag head 1 reaches the point E, the deviation becomes plus(+) and the position of a swell compensator 2 comes to the lower limit alarm point, and thereby the winch is wound down.


Inventors:
FUJINO SHINGO
HOTSUTA TAKEO
TODA MASAYUKI
Application Number:
JP1982000056911
Publication Date:
October 15, 1983
Filing Date:
April 06, 1982
Export Citation:
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Assignee:
UNYUSHIYOU DAIGO KOUWAN KENSET
MITSUBISHI HEAVY IND LTD
International Classes:
E02F3/90; (IPC1-7): E02F3/90
Domestic Patent References:
JP44002139A
JPS5534261A1980-03-10
JPS5145169A1976-04-17



 
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