Structure Analysis And Optimization Design For The Chassis Frame Of Rotary Drilling Rig

Rotary drilling rig is currently main popular pile machinery, and has the advantages of speedily piling hole and high quality. Rotary drilling rig is rapidly developed, which researching on rotary drilling rig has become an important branch of mechanical engineering field. In paper, the chassis of the rotary drilling rig is studied, which help to accelerate the development of Rotary drilling rig.From the theory research starting, two typical operating conditions of rotary drilling rig, lifting operating condition and drilling operating condition, are considered and analyzed the load in detail. The load is transferred to the chassis by mast, three tripod, boom, luffing mechanism, rotating platform, which the chassis supports the full load of equipment. Therefore, according to the results of load analysis, under respective working conditions, stresses of the load transmission components are analyzed, and mathematical models of the above two typical operating conditions are established. Considering the parameters under different conditions, stress of the classic in different working conditions is obtained. 3D modeling of the chassis built by software Pro/E is imported into the finite element software ANSYS Workbench. Through meshing the finite element, the process of finite element modeling is finished. Using the Modal module, the modal analysis of the chassis is executed to get ahead 6 order modal frequencies and vibration modes. Based on the results, the dynamic performance of chassis is simply analyzed. The loads and constraints of different working conditions are applied to the 3D model. The static simulation is analyzed, and obtained stress, strain, chassis displacement, and safety factor cloud picture of chassis under different conditions. According to the results, the farthest lifting drilling condition is the most dangerous working condition of chassis. At the same time seen, under the chassis meeting all the working requirements, it exists optimization space. Then, using the Design Explorer module of ANSYS Workbench, the plate thickness of chassis as design variables, optimizes the structural design, aiming to reduce the weight of the chassis. Finally, the chassis’ weight is reduced by 6.75%.