1.Brief introductions of KHYD140 electric rock drilling rig for coal mine KHYD140 electric rock drilling rig is a tool for rock blasting hole. ·electric rock drilling rig should be equipped with drilling stand, and can be horizontally forward or inclined upward to drill in any direction. ·In order to prolong the service life of drill bits and improve the working conditions of operators, water draining powder is called wet drilling. ·In the operation of drilling rig, we only need to operate the hand wheel, and the electric motor rock drilling rig can push itself forward and return quickly. 2.Specifications of KHYD140 electric rock drilling rig for coal mine Model KHYD140 Rated output power of electric motor kw 5.5 Rated voltage of electric motor v 380 Rated frequency of electric motor hz 50 Rated current of electric motor a 11.6 Motor rotating speed r/min 1440 Motor phase number three phase communication Rated working mode continuity Drilling speed mm/min 280 Maximum axial thrust n 12000 Borehole diameter mm 42-80ï¼?rockï¼? 80~100ï¼?coal seamï¼? Hardness range protodikonov`s scale of hardness f