Abstract:Because of the advantages of large diameter and high efficiency of drilling hole, the drilling machine is widely used in mining and construction. The essence of downhole drilling is that under the action of axial pressure, rock is broken by using two kinds of forces, impact and rotation. Finally, a large amount of rock powder is discharged out of the hole through compressed air along the hole wall and the drill pipe. Two sets of dry dust removal and wet dust removal systems are designed for the downhole drilling rig. According to the production usage situation, the dry dust removal system is not suitable for the field operation, and the wet dust removal system is unstable due to the unreasonable structure design. Through the analysis and summary of the structure of the wet dust removal system, the modification scheme is made and the implementation is organized, and the better dust removal effect is achieved.