高能射流式液动锤低阻高效冲锤结构研究

Study on Low-Resistance and High-Efficiency Impact Hammer Structure of High Blow Energy Liquid-jet Hydraulic Hammer

摘要:

为了对SC-86H型高能射流式液动锤冲锤结构进行优化，应用CFD动态分析，对2种不同冲锤结构的射流式液动锤模型进行了研究。计算表明：在相同输入流量下，新型冲锤结构的射流式液动锤与原冲锤结构相比性能具有优势，冲击末速度得到了提高，冲击功与能量利用率平均增长7.9%与12.7%，新型冲锤结构减小了流体阻力消耗的能量，更有利于高能输出。另外，通过Ls-dyna非线性动力学分析，对2种冲锤结构的碎岩效果进行了研究，并对新型冲锤应力强度进行了分析。结果表明：新型冲锤结构的能量传递效率更高，且满足疲劳强度校核，相同冲击末速度下，岩层吸能值高于原冲锤结构；新型冲锤结构的吸能率较高，2种冲锤模型的吸能率随入射能量成非线性增长。

关键词:射流式液动锤;冲锤;冲击功;能量利用率;能量传递

Abstract:

In order to optimize the impact hammer structure of high blow energy SC-86H liquid-jet hydraulic hammer, 2 liquid-jet hydraulic hammer with different structures of impact hammer were studied by means of CFD dynamic simulation. The calculation demonstrates that the performance of the newly designed impact hammer has advantages compared with the traditional one under the condition of the same input flow rate; the last impacting velocity is improved, the impact energy and energy utilization increase by 7.9% and 12% in average respectively. The energy consumed by the fluid resistance was reduced by new impact hammer structure to increase the high energy output. In addition, rock breaking efficiency of the hammers was studied based on Ls-dyna nonlinear kinetic analysis and the analysis was carried out on the stress intensity of the newly designed impact hammer. The results show the higher efficiency of energy transfer of impact hammer with new structure, which meets the requirement of fatigue strength checking. At the same last impacting velocity, energy absorption value of rock strata is higher than the traditional impact hammer, while the newly designed impact hammer has high energy absorption ratio. The energy absorption ratios of these two impact hammer models increase nonlinearly as the incident energy increases.

Key words:liquid-jet hydraulic hammer; impact hammer; impact energy; energy utilization; energy transfer