Excavating – Peat excavators
Patent
1979-08-16
1981-12-29
Burr, Edgar S.
Excavating
Peat excavators
37 59, 417125, 417138, E02F 388
Patent
active
043075258
ABSTRACT:
An efficient dredging device is disclosed, which includes a submersible pump having one or more chambers. Each chamber defines an air port through which air can be delivered to and exhausted from the chamber, and a material discharge port for discharging liquid and solid material from the chamber. A check valve is associated with the discharge port to prohibit the return of discharged material to the chamber. A chamber suction port admits liquid and solid material to the chamber, and a check valve prohibits the escape of material from the chamber through the suction port. Air control means are provided for cyclicly exhausting air from the chamber to admit material to the chamber through the suction port, and for delivering air to the chamber so as to discharge material from the chamber through the discharge port. A rotatable cutter member cuts material to be dredged, and pipes connect the cutter to the chamber discharge port. A vacuum system is provided to reduce air pressure inside the chamber to less than one atmosphere so as to permit the dredge pump to work in very shallow water. This vacuum system can include a jet pump connected to a compressed air source. The pump vessel is suspended from a kelly bar, and the kelly bar is engaged by a torque fork to inhibit bar and pump chamber rotation and other movement during pump operation.
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Nishi, K.; "Dredging of High-Density Sludge Using Oozer Pump;" Dredging: Environmental Effects & Technology, Proceedings of WODCON VII, 7/1976.
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Amtec Development Company
Burr Edgar S.
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