潜孔冲击器结构性能参数优化研究

Optimization of Structural Parameters of DTH Hammer

为了研究潜孔冲击器的冲击运动规律,提高其冲击性能,采用有限差分法,通过对活塞运动进行数学建模及MATLAB仿真计算,模拟活塞动力学过程,并得出潜孔冲击器相应的冲击性能参数。同时研究后气室配气长度对潜孔冲击器冲击性能的影响,对后气室排气长度、后气室压缩长度和后气室进气长度建立关于冲击功率、冲击功和冲击频率的正交分析试验,并对数据结果进行优化,以更好地提高潜孔冲击器的冲击性能。研究结果表明:对冲击功率影响最大的是后气室进气长度,对冲击功影响最大的是后气室排气长度,而对冲击频率影响最大的则是后气室排气长度及后气室压缩长度;优化后冲击功率提高9.64%,冲击功基本保持不变,冲击频率提高10%。相关研究对潜孔冲击器设计及应用具有一定的指导意义。

To study the impact motion of the down-the-hole hammer and improve its impact performance,the finite difference method is used to simulate the piston dynamics through mathematical modeling and MATLAB simulation of the piston motion,and the corresponding impact performance parameters of the DTH hammer are attained.The influence of the gas distribution length of the rear chamber on the impact performance is also studied.The orthogonal experimental analysis of impact power,impact energy and impact frequency is established for the exhaust length,compression length and inlet length of the rear chamber.The results are optimized to improve the impact performance of the DTH hammer.The study results show that the inlet length of the rear chamber has the greatest influence on the impact power,the exhaust length of the rear chamber has the greatest influence on the impact energy,the exhaust length and compression length of the rear chamber has the greatest influence on the impact frequency.Optimization leads to an increased impact power by 9.64%,a basically unchanged impact energy,and an increased impact frequency by 10%.The study has certain guiding significance for the design and application of DTH hammer.