Selection, use and normal maintenance of mine drilling tools
Selection of Mine Drill Head
According to the nature of the rock, select the appropriate hard alloy mine drill bit. Generally speaking, the rock with high hardness selects the drill bit supplied by the alloy with relatively low hardness, and the alloy drill bit with relatively high hardness is selected. For extremely hard rocks, if the power of the rock drill is large, a three-blade or cross bit can be used. At this time, in order to facilitate the unloading of the drill, the taper hole of the drill bit can be used 11 ° or 12 °. For medium hardness rock with good integrity, in order to improve work efficiency and reduce costs, ball tooth bits can be selected.
