In this paper,the mechanics analysis of the bolt of the rotary impact hydraulic bolt drill is carried out.Firstly,the 3D model of the bolt is constructed,and then the working mechanism,stress distribution and potential failure mode of the bolt are analyzed in detail by the finite element analysis method.The results show that there is stress concentration at the contact between bit rod and bit head,which may become a potential dangerous surface in later work.Finally,modal analysis is carried out to reveal the relationship between the natural frequency of bolt and the size of bolt,in order to provide scientific basis for the design and optimization of bolt,and then improve the performance and safety of rotary impact hydraulic bolt drill.
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