直接提钻工况下双斜撑长螺旋钻机桅杆稳定性分析

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

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λ_1,λ_2,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λ_1和λ_2的逐渐增大,先增大后减小,且λ_1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。

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 estab‐lished.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 parametersλ1 andλ2,the mast sec‐tion inertia moment I and the main hoisting wire rope angleθ.Meanwhile,F cr first increased and then decreased with the increase ofλ1 andλ2,and the impact of theλ1 was much bigger than the im‐pact ofλ2.With the increase of I,F cr first increased rapidly,and then gradually eased.With the increase ofθ(0°≤θ≤20°),Fcr increased slowly.The conclusion can be expanded to analyzing the stability of the similar machinery structures in the context of engineering machinery.