Design and Analysis of Iron Roughneck Non-Clamp-Tooth Clamping Mechanism

Abstract

During the makeup and breakout operation of iron roughneck, the performance of the clamp tooth holding the pipe string directly affects the drilling efficiency and the service life of the pipe string. In this paper, a cylindrical non-clamp-tooth Clamping body with 20CrMnTi material is designed to replace the upper shackle clamp tooth. In the up-shackle operation of the torque wrench, the clamping body contacts the outer wall of the string in the form of two parallel axis cylinders, the relationship between each influencing factor and contact stress is established, and the contact stress and deformation of the string are simulated by finite element method. This non-clamp-tooth clamping body can reduce the damage degree of the string, make its elastic deformation not exceed 1mm, and improve the service life of the clamping body.