Structural Analysis And Optimization Design Of Drill Pipe System For Rotary Drilling Rig

Drill pipe of rotary drilling rig is an important component for the rotary drilling rig to complete pore forming operation.It is connected between the fuselage and the drill,and is of telescopic sleeve construction.Its function is to transfer the torque and axial pressure provided by the power head to the lower end of the bit to complete the drilling of soil hole.It has many types,the research object of this paper is mechanical locking rotary drilling pipe.It often transmits great torque and large axial pressure.As a result,various kinds of failures often occur in the drill pipe joint or the sudden shape change position.Meanwhile,due to its slender rod structure,the compression instability will occur when the axial load is too large.It is difficult to accurately calculate the stress concentration at the vulnerable position and critical buckling load by using the traditional methods.In order to realize the rational design of the structure and lightweight of the mechanical locking rotary drilling pipe,it is of great practical significance to establish a more accurate finite element analysis model of the drill pipe system.In this paper,the TGJ508 mechanical locking rotary drilling pipe is used as the research object,and the finite element analysis software ANSYS as a tool.Using the parametric design language of ANSYS established the three-dimensional finite element model of drill pipe.According to the actual working condition of drill pipe,limited the constraint and loads on the finite element model,completed the drill pipe of static analysis,buckling analysis and modal analysis.obtained the stress distribution,the buckling limit load and natural frequency data information of drill pipe.At the same time,the correctness of the drill pipe model is verified by the traditional theoretical calculation and stress test.Finally,according to the results of stress analysis and parametric platform,on the basis of satisfying the stiffness and strength,the drill pipe structure is improved and redesigned to achieve the goal of more reasonable and lightweight structure.