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钻架是潜孔钻机的关键结构件,用以支撑钻杆完成所有的钻进动作,受力情况复杂。分析潜孔钻机的实际工况,得到不同工况下的受力边界条件,建立钻架的有限元模型并进行受力分析和模态分析。分析结果表明:在垂直打钻卡钻和钻架起升工况下,钻架的最大应力均发生在滑架组件与钻架接触的上端部位。此外,由于钻架的整体刚度较大,因此其固有模态值较小,远低于冲击器20Hz的冲击频率,冲击器不会引发钻架共振。
Drilling rig is the key structure of DTH drilling rig, to support the drill pipe to complete all the drilling action, the force situation is complicated. The actual working conditions of DTH drilling rig were analyzed, the force boundary conditions under different working conditions were obtained, the finite element model of drilling rig was established, and the stress analysis and modal analysis were carried out. The analysis results show that the maximum stress of the drill holder occurs at the upper end of the contact between the carriage assembly and the drill holder in the vertical drilling operation and the lifting of the drill stand. In addition, due to the overall stiffness of the drill frame is larger, so its inherent mode value is smaller, far below the impact frequency of the impactor 20Hz, the impactor does not cause the drill frame resonance.