The most powerful unit of the single boom drill jumbos. Segment for small dimension tunnels. Adopting modular design, it can be convenienty disassembled and assembled, and wth the maximum width of only 0.98m, t can meet the requirements ofdown-hole operation in a smal cage shaft. Driven by a dese engine and provided with a hydraulc whel four-wheel drive ariculated chasis and a large arm theposture of which can be adiusted during walking, t has the advantages of smal turtino radius. strond passina canabilily. and good maneuverability and can walk freely in a small-section tunnel.Wireless remote control enabies more inteligent and comfortable operation, safer and more eficient construction, and easier and more convenientmaintenance: hydraulic system has automatic dil arm levelng, ant-amming, ant-iding , and tapping functions, and is appicable to boring of tunnel with asecion of 3.9mx3.6m W xH), and when provided with an inteligent control system of drl rig, t enables one-touch automatic ful-section drling according to thetesioned hol patern and is a brelerred borind apuromenl lor sma and meduim ized mines in realze mechanizalon and inteedlualizaton