Pneumatic drilling machine hexagonal type power take off main shaft for coal mine

The utility model discloses a pneumatic drilling machine hexagonal type power take off main shaft for coal mine, including driving shaft and integral key shaft, the driving shaft passes through the tapering screw with the integral key shaft and pegs graft the butt joint and constitute integrative hollow output main shaft, the front end of driving shaft is provided with the sleeve, the outer cross -section of telescopic front end is circular, the size in the outer cross -section of telescopic front end keeps the axiality with the size of the drilling rod of pneumatic drilling machine, the cross -section is hexahedron structure in the telescopic front end, integral key shaft inside is provided with a plurality of effect teeth, is the thickness of effect tooth 2.9 3.1cm, is the minimum curvature radius of tooth root circular arc of effect tooth 0.39 0.41. The utility model discloses the type realizes that the long -term high load operation of colliery drilling operation improves the production efficiency in coll