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Full-Text Articles in Mining Engineering
Method And Apparatus For Water Jet Drilling Of Rock, David A. Summers, Marian Mazurkiewicz, Dwight J. Bushnell, James Blaine
Method And Apparatus For Water Jet Drilling Of Rock, David A. Summers, Marian Mazurkiewicz, Dwight J. Bushnell, James Blaine
Mining Engineering Faculty Research & Creative Works
Rock drilling method and apparatus utilizing high pressure water jets for drilling holes of relatively small diameter at speeds significantly greater than that attainable with existing drilling tools. Greatly increased drilling rates are attained due to jet nozzle geometry and speed of rotation. The jet nozzle design has two orifices, one pointing axially ahead in the direction of travel and the second inclined at an angle of approximately 30° from the axis. The two orifices have diameters in the ratio of approximately 1:2. Liquid jet velocities in excess of 1,000 ft/sec are used, and the nozzle is rotated at speeds …
Thrust-Impact Rock-Splitter, George Bromley Clark, T. F. Lehnhoff
Thrust-Impact Rock-Splitter, George Bromley Clark, T. F. Lehnhoff
Mining Engineering Faculty Research & Creative Works
A rock splitting tool having elongate laterally expanding metal pressure bars or feathers and an axial sliding wedge or spreader for radially separating the feathers, the wedge being driven by the combined and superimposed forces of a hydraulic thrust servomotor and an impact hammer. The driving paths for transmitting forces to the wedge are coaxial and partially in series and partially in parallel.