... 2.Rotary drive multi-gear control includes four models: rock drilling, standard, e With anti-shock truss-structure mast and ... stroke and stronger feeding force, SR280RII rotary drilling rig can drill in the rock stratum with uniaxial compression strength not exceed ... -saving. Rotary drive multi-gear control includes four models: rock drilling, standard, energy-saving and soil-dumping, to adapt to ...