Exploitation And Dynamic Simulation On Special Drilling Of Rotary Drilling Rig

In the field of current piling machinery, rotary drilling rig occupies a long-termimportant position under the city, railway and highway construction, due to its efficient,environmentally friendly, adaptable and other advantages. The present rotary drilling rig hasvariety of drilling tools. Considering the construction program, twist drilling tool is mainlyadopted, mounting hole Hammer and other rock-breaking instruments. However, there existseveral defects such as low efficiency and high cost. Therefore, this paper aims to propose adrilling tool solution with high drilling efficiency and low cost. For soft rock layer representedstrata, a new-type torsional vibration drilling bucket is developed. Ultimately driven by ahydraulic shaker, drilling bucket has a dual function with vibration and torsion, with anefficient tunneling and holing ability for soft rock.Firstly, based on the analysis of vibration mechanism, the excavation and rock breakingeffect of different drilling were compared. And for torsional vibration drilling bucket, theefficiency and feasibility of "Impact-Rotary" method was summarized, laying a theoreticalfoundation for special drilling applications.Secondly, combined with three-dimensional solid model, the overall hydraulic torsionalvibration drilling bucket structure and core components were further elaborated. Usinghydraulic linkage control and hydraulic volume velocity modulation way, modified controlscheme for matching hydraulic reel and up-down movement was proposed. It was conduciveto improve the working efficiency, and avoiding the damage caused by misuse.Then, construction procedures and working principle of rotary drilling rig with thetorsional vibration drilling bucket were analyzed, in order to simulate what problems may beencountered in practical applications. Meanwhile drilling rig and internal hydraulic systemwere partial improved, establishing the corresponding improved modules based on modularconcept. After being improved, drilling rig can hang with torsional vibration bucket-type, andfully play its construction characteristics.Finally, for stress situation for drilling bucket cutting rock and soil, a mathematicalmodel was established. ABAQUS software was applied to dynamic simulate and analyze theeffect of vibration assisted cutting rock by the drilling gear. And several core componentssuch as the exciter eccentric of torsional vibration drilling bucket, damping spring of shockabsorber and bevel gears were finite element analyzed. Combined with cloud images and thegraphs, the rationality and feasibility of the design were demonstrated.