The utility model discloses a soil discharging variable-screw-pitch type spiral conveyor behind a tunneling machine. The conveyor comprises a hollow tube body, a rotating shaft, a plurality of spiral sheets, a soil discharging hopper, a pinion, a hydraulic motor and a hydraulic oil cylinder, ...
Variable pitch harvester combine auger United States Patent 3060665 Application Number: US1633560A Publication Date: 10/30/1962 Filing Date: 03/21/1960 Export Citation: Click for automatic bibliography generation Assignee: SCREW CONVEYOR CORP Primary Class:...