... operate, 2)strong torque,high drilling efficency 3)trailer type CJW130 hydraulic water well drilling rig Application scope 1,Used for ... , geophysical exploration, high-way and building construction, and blast-hole drilling etc. 2,With hydro-automatic feeding device, and high ... ,Designed with hydro-chucking unit instead of slips to ensure drilling from stop when changing pipes. 4,Close levers, convenient ...