... on different stratum, we can adjust torque and rotary speed of drilling rig to increase drilling rigs adaptability. At the same time, we can ... : Hole Diameter (mm):Φ150-Φ250Hole Depth (m):120-80Rod Diameter (mm):Φ89,Φ102,Φ114Rod Angle (°):900Output Rotary Speed of Power Head (r/min ... Frame (mm):900Lifting force of Power Head (kN):65Lifting speed of Power Head (m/min):1,5.9,15Feeding Force of Power ...