Open pit drilling rig: According to the different working mechanisms of crushing ore and rock, it is divided into steel rope impact drilling rig, down the hole drilling rig, rotary drilling rig, and rotary drilling rig. The steel rope impact drilling rig has gradually been replaced by other drilling rigs due to its low efficiency. The down the hole drilling rig uses a drill rod to drive the pneumatic impactor and drill bit to rotate together, and uses the piston of the pneumatic impactor to impact the drill bit to break the ore rock. It is usually used in small and medium-sized mines to drill blast holes with a diameter of 80-250 millimeters.