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改进了文献〔１〕中的理论模型并利用一种修正的弹簧模型，通过对石油钻柱接头螺纹的受力分析，分别建立了上扣扭矩、轴向外载作用下螺纹载荷分布的计算模型，详细分析了螺纹载荷分布规律，指出了螺纹锥度、不同润滑脂的润滑所产生的摩擦系数、螺纹牙的弹性系数对螺纹联接的载荷分布规律的影响关系，给出了改善接头受力状态、减小应力集中的主要措施。还通过一种简单的力学模型得到了螺纹联接的极限轴向外载。
The theoretical model in literature [1] is improved and a modified spring model is used to establish the calculation model of the screw load distribution under the action of overtightening torque and axial load by analyzing the force of screw connection of oil drill string. , The distribution rules of thread load are analyzed in detail, and the relationship between the thread taper, the friction coefficient caused by different grease lubrication and the elastic coefficient of thread teeth on the load distribution of the screw thread coupling are given. Reduce the stress concentration of the main measures. A simple mechanical model is also used to determine the ultimate axial load on the threaded connection.