本文分析了凿岩机轴推力传统的计算方法不够准确的原因,提出了对凿岩机所施轴推力不仅要保证钎头与孔底的接触,而且同时也要保证充分发挥凿岩机冲击功率的基本计算观点。结合液压凿岩机运动学特点,导出了计算液压凿岩机额定轴推力和系统最优轴推力的简单、实用公式。公式有较好的准确性,可供工程设计计算使用。 This paper analyzes the reason that the traditional calculation method of rocker shaft thrust is not accurate enough, and puts forward that the shaft thrust applied by rock driller should not only ensure the contact between drill bit and hole bottom, but also make sure that the impact power of rock drill is fully exerted. Combined with the kinematic characteristics of hydraulic rock drill, a simple and practical formula for calculating the thrust of hydraulic rock drill and the optimal axial thrust of the system is derived. The formula has better accuracy, which can be used for engineering design calculation.