A high-efficiency crawler rig featuring advancedRC drilling technology and double-wall drillpipes. Cuttings are discharged through the innertube and collected by a cyclone separator forreliable geological sampling.Suitable for various formations and com-pressed-air reverse circulation DTH drilling. Fullyhydraulic control of drilling, rod handling, mast,winch, stabilizers and crawler travel reduceslabor and improves drilling efficiency.