... Machinery Co.,Ltd. have produced DTH drilling rig and air compressors for mining project over 20years.Product range:1,All ... DTH drilling rig6,Diesel movable screw air compressor for DTH drilling rig7,Electric movable screw air compressor for DTH drilling rig1, ... drilling rigLow gravity, great ground clearance, make cars easily make drill through rugged road. High-power motor drive and strong climbing ...