School of Mechanical Engineering, Yangtze University, Hubei, China.
Hubei Engineering Research Center for Oil & Gas Drilling and Completion Tools, Hubei, China.
PLoS One. 2023 Aug 31;18(8):e0290427. doi: 10.1371/journal.pone.0290427. eCollection 2023.
During the operation of drilling rigs, bolts are subjected to significant loads, rendering bolt groups vulnerable to failure due to uneven load distribution. This study investigates the multi-bolt load distribution characteristics of eight-gear and four-gear symmetric transmission mechanisms in drilling rigs. The spring stiffness method is utilized to analyze multi-bolt load distribution. A finite element model of the bolted connection is developed by integrating the structural shape and transmission mechanism. The model's accuracy is validated through a rack strain test under various loads. Based on the finite element analysis results, this study proposes an evaluation method for bolted connections using relative deformation difference. The impacts of bolt pitch, end distance, preload, and thickness of the derrick connection plate under different load positions on the connection are examined. This paper presents a methodology and conclusions that can inform the design of bolted connections for heavy-duty drive systems.
在钻机的运行过程中，螺栓承受着巨大的载荷，由于载荷分布不均匀，螺栓组容易失效。本研究调查了钻机中八齿轮和四齿轮对称传动机构的多螺栓载荷分布特性。采用弹簧刚度法分析多螺栓载荷分布。通过整合结构形状和传动机构，建立了螺栓连接的有限元模型。通过在不同载荷下的齿条应变测试验证了模型的准确性。基于有限元分析结果，本文提出了一种使用相对变形差评估螺栓连接的方法。研究了在不同载荷位置下，螺栓节距、端距、预紧力和井架连接板厚度对连接的影响。本文提出了一种方法和结论，可以为重型驱动系统的螺栓连接设计提供信息。
