潜孔锤破岩系统动力学特性研究

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (1) : 62-69.

论文

潜孔锤破岩系统动力学特性研究

蔡芝源1，江红祥1,2

作者信息 +

Dynamic characteristics of rock crushing system with DTH hammer

CAI Zhiyuan1， JIANG Hongxiang1,2

Author information +

文章历史 +

摘要

为深入研究潜孔锤破岩过程中推进力、激振频率等对潜孔锤破岩系统特性的影响，基于弹簧、阻尼、滑动器等元件建立了考虑潜孔锤与岩石局部接触、完全接触状态的动力学模型。分别建立不同状态下系统的动力学方程，并基于阶跃函数建立破岩系统的连续无量纲微分方程组，采用龙格-库塔法求解获得不同状态下的潜孔锤钻头位移图、速度图、相空间图以及庞加莱截面图。结果表明：破岩系统的运动状态随推进力改变而改变，当系统处于周期-1状态时，系统相对较稳定且破岩效率最佳；随着激振力频率增大，系统稳定的区间范围随之增加，但破岩效率反而降低。破岩系统动力学特性研究结果为潜孔锤在实际工作中的参数确定提供理论依据。

Abstract

In order to deeply study effects of propulsion force and exciting frequency on characteristics of a rock crushing system with down-the-hole (DTH) hammer in rock fragmentation process, a dynamic model considering local contact and complete contact states between DTH hammer and rock was established based on spring, damper, slider and other components. Dynamic equations of the system under different states were established, respectively. The continuous dimensionless dynamic differential equations of the rock crushing system were established based on the step function. Runge-Kutta method was used to solve the equations, and obtain displacement diagram, velocity one, phase plane one and Poincaré sectional view of the DTH drill bit under different conditions. The results showed that the motion state of the rock crushing system changes with variation of propulsion, when the system is in the period-1 state, it is relatively stable and its rock crushing efficiency is best; with increase in exciting force frequency, the stable range of the system expands, but the rock crushing efficiency drops; the study results of dynamic characteristics of the rock crushing system provide a theoretical basis for determining parameters of DTH hammer under actual working conditions.

导出引用

蔡芝源1，江红祥1,2. 潜孔锤破岩系统动力学特性研究[J]. 振动与冲击, 2020, 39(1): 62-69

CAI Zhiyuan1， JIANG Hongxiang1,2. Dynamic characteristics of rock crushing system with DTH hammer[J]. Journal of Vibration and Shock, 2020, 39(1): 62-69

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