直接提钻工况下双斜撑长螺旋钻机桅杆稳定性分析

为准确分析直接提钻工况下双斜撑长螺旋钻机桅杆的稳定性，建立双斜撑作用下多段桅杆的挠曲微分方程，引入边界条件，获得双斜撑作用下桅杆失稳特征方程及其提钻临界值。对ZLH43ZL（TB）-D180长螺旋钻机进行稳定性分析，将推导结果与采用ANSYS有限元方法所得结果进行对比。结果表明：推导的失稳特征方程基本正确；直接提钻工况下双斜撑长螺旋钻机桅杆的失稳临界值F_cr与主、副斜撑点位置参数λ₁，λ₂，桅杆截面惯性矩I和主卷扬钢丝绳角度θ等因素有关。失稳临界值F_cr随λ₁和λ₂的逐渐增大，先增大后减小，且λ₁对F_cr的影响甚于λ₂；F_cr随I的增大，先迅速增大，后逐渐平缓；F_cr随θ（0°≤θ≤20°）不断增大而缓慢增大。研究结果对工程机械中类似结构的稳定性分析有一定参考价值。

Stability analysis of the mast of continuous flight auger driller with double braces under direct-drill-lifting condition

To analyze the stability of the mast of continuous flight auger driller with double braces under direct-drill-lifting condition, the deflection differential equations of the mast were established. With proper boundary conditions, the instability characteristic equations of the mast and the critical value of lifting drill were presented. The stability of ZLH43ZL(TB)-D180 continuous flight auger driller was analyzed, and the theoretical analysis results and the calculating results by ANSYS finite element method were compared. The results implied that the established instability characteristic equations were right and revealed that the instability critical value F_cr was related to the factors such as the main and auxiliary supporting position parameters λ₁ and λ₂, the mast section inertia moment I and the main hoisting wire rope angle θ. Meanwhile, F_cr first increased and then decreased with the increase of λ₁ and λ₂, and the impact of the λ₁ was much bigger than the impact of λ₂. With the increase of I, F_cr first increased rapidly, and then gradually eased. With the increase of θ (0° ≤ θ ≤ 20°), F_cr increased slowly. The conclusion can be expanded to analyzing the stability of the similar machinery structures in the context of engineering machinery.