4000 m岩心钻机桅杆结构设计与有限元分析

Structural design and finite element analysis of the 4000m core drill mast

摘要:

桅杆是钻机的重要组成部分，本文对勘探技术所自主研制的4000 m地质岩心钻机桅杆进行了结构设计分析，为确保桅杆满足强度、风载等使用工况要求，在SolidWorks中完成桅杆的建模，运用ANSYS Workbench对桅杆装配体进行有限元分析，完成对桅杆结构强度和刚度的校核，并对其进行模态分析，得到前10阶固有频率和振型。与激振源进行对比，分析发现第1阶、第2阶固有频率与钻机转盘和起升系统频率有重叠，可能会发生共振。通过调节钻机转盘和起升系统转速避免发生共振，振动时最大变形处变形量较小，说明桅杆结构设计合理，能够满足实际应用要求，具有一定的工程应用价值。

关键词:岩心钻机;桅杆;结构设计;静力学分析;模态分析;有限元分析

Abstract:

The mast is an important part of the drill. This paper describes the structural design of the mast of the 4000m core drill independently developed by Institute of Exploration Technology. In order to ensure that the mast meets the requirements of working conditions such as strength， wind load， the mast model is created with SolidWorks， and ANSYS Workbench is used to carry out the finite element analysis for the mast assembly to verify the strength and rigidity of the mast structure， and perform the modal analysis to obtain the first 10 intrinsic vibration frequencies and modes. They are compared with the excitation sources， and the results show the first and second intrinsic frequencies overlap with the frequencies of the drilling turntable and hoisting system， which may cause resonance； thus， the rotating speed of the drilling rig turntable and hoisting system is adjusted to avoid resonance. As a result， the deformation amount is small at the maximum deformation position during vibration， indicating that the mast structural design is reasonable， and can meet the actual application requirements； therefor it has some value in engineering application.

Key words:core drill;mast;structural design;static analysis;modal analysis;finite element analysis