... line core drilling and reverse circulation drilling, we have designed XY-4-3 spindle type core drilling rig. It is developed ... on XY-4 drill. The central opening dia of drill head is ... line, lower speed, kN)29Hoist lifting speed (3rd layer, m/s)0.82, 1.53, 2.16, 3.13Wire rope dia ... data do not consider power losses. Water Well Drilling Rig XY-4-3A(HOT)