中文摘要：

钻架是水平定向钻的主要承硪部件，其强度和刚度对钻机能否正常工作影响很大。针对钻架传统设计方法存在的问题，提出利用有限元方法对设计进行校核。对水平定向钻钻进工况进行了分析，确定了有限元分析方案，并利用ANSYS软件建立了钻架有限元模型，在此基础上进行了应力应变分析。分析结果表明，钻架的强度能够满足要求，但部分结构需要改进，例如将单排链传动改为双排链传动。结构改进后重新进行分析，发现钻架强度和应力分布有了明显改善。该方法为钻架设计和优化提供了理论依据，有助于提高设计效率。

英文摘要：

The drilling frame is the main load - carrying part in horizontal directional drill, its strength and stiffness have great effect on the performance of the drill. Aimed at the problems exist in the traditional design of drilling frame, FEM is adopted to check the structure. The drilling condition is analyzed, and the analytical scheme is proposed. Then the finite element model for the drilling frame is established, and the stress - strain analysis is proceeded. The result shows that the strength meets the requirement, but some parts need to be improved, such as changing from one strand chain to double strand chain. The structure is analyzed again after improvement, and the result shows that the strength and stress distribution are improved obviously. The FEM provides theoretical basis for design and optimization of drilling frame, and increases design efficiency.