Simulation Research On Vibration Law Of Friction Rod Of Rotary Drilling Rig

Drill rods are the key part of rotary drilling rigs,and the vibration of it is necessary to research.This article takes the 450 mm friction rod as the object and carries out the static and dynamics Simulation analysis on it.The statics simulation shows that the stress concentration area of the drill pipe is mainly located on the key bar at the joint of the drill pipe when the drill pipe is subjected to pressure and torque.Torque is the main factor affecting the deformation of the drill pipe,and as the length of the drill rod increases,the deformation also increases.When closing to the maximum drilling depth,the principle of small torque and small feed should be followed.The dynamic simulation analysis of the drill pipe includes natural vibration and forced vibration,and the natural vibration simulation of the drill pipe indicate that: as the overhang elongation of the drill pipe increases,the drill pipe’s The natural frequency decreases and the amplitude increases accordingly;when drilling,avoid using the rotational speed value that causes resonance.By simulating the forced vibration of the drill pipe,we obtain that when the rotation speed remains the same,the horizontal vibration amplitude of the drill pipe decreases with the increase of weight on bit,while the longitudinal vibration increases.When the weight on bit is constant,the drill pipe’s transverse vibration decreases with the increase of the speed,the longitudinal vibration of the drill pipe increases.Considering the transverse and longitudinal vibration of the drill pipe,it is concluded that the weight on bit is 100 ～150KN,when the rotation speed is 20～25r/min,the horizontal and longitudinal vibration of the drill pipe are both small,which is the optimal interval for drilling parameters under this working condition.This article provides guidance for construction drilling to reduce drill rod damage and borehole deflection caused by vibration,and provides references for drill rod failure problems and vibration control research.