... It uses the moving sub-head,and hydraulic power is provided by the two-pump. The hydraulic system keep stability and reduce the use ... to keep pushing,increasing the lifting force and lower the trouble. 3.Increasing Strength of Bent Beams and Both steel guideways, wear ... operations arbors.can be horizontal,vertical,tile,and other parties blast hole bits,pre-hole ,bole hole. Down the hole drill series