A hydromechanical cutter for soft solids such as coal has most of the cutting done by central fluid cutters, but includes a peripheral mechanical cutter to keep the bore hole of uniform diameter. Straighter holes can be formed. The cutter can be deviated by having an angled fluid cutter which cuts into the bore wall to form a wash out when the fluid cutting pressure is increased.
申请公布号
WO9746786(A1)
申请公布日期
1997.12.11
申请号
WO1997AU00341
申请日期
1997.05.30
申请人
THE UNIVERSITY OF QUEENSLAND;COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH OR;DUNN, PAUL, GREGORY;STOCKWELL, MATTHEW;LIU, YUZHOU