ZDY-220, ZDY-660 and ZDY-2000S,Drilling hole for water exploring and injection,gas exploring,geological exploring, ... position (±90°) for in underground coal mine. Adopting entire hydraulic system, consists of main frame, pump station and operational panel. With ... is easy to disassemble and transportation. It suits for different drilling requirements with using high-grade alloy, PDC drill bits , large ...