Dynamic Research And Structure Optimization Of Crawler Base Oscillation Mechanism

Crawler base oscillation mechanism plays a vital role on the barrier-crossing reliability and stability of drill rig due to its connection use for crawler and drilling platform. However, expiration happens frequently, which leads to construction postponement even serious accidents. In order to improve its reliability, with Sunward SWDH89-1top-hammer drill as research platform, combined with theoretical analysis and experimental method, dynamic analysis and structural optimization on the oscillation mechanism were studied based on practical construction conditions. The specific works of this paper are as follows:(1) The actual construction conditions of top-hammer drill were elaborated. Through conducting stress analysis and expiration analysis in multiple conditions, it came to conclusion that the wrong operation and the bad structure constituted to the expiration. Finally, the optimization method which focused on improvements on the operation of the rig and optimization of the structure was formulated.(2) In order to analyze how working posture influences the impacts suffered by hinged support, drill luffing mechanism kinematic equations were established within D-H method. Next, the real-time centroid coordinates of each component of luffing mechanism and eventually real-time moment of inertia under different working attitude were obtained. The best drill actual barrier-crossing posture was proposed.(3) Based on ADAMS and AMESim, the co-simulation platform was set up to conduct multi-condition simulation for hinged support. The worst condition was identified and the method using best drill actual barrier-crossing posture to reduce the impact was verified. Through the establishment of finite element model of hinged support in ANSYS, the load of the worst attitude was used as boundary conditions when analyzing the influence of the support angle on the stress and its distribution. The optimal arrangement of the hinged support angle was discussed. (4) In order to verify the co-simulation model, the experimental platform was set up to conduct multi-condition experiments. The reasons for the existed error between experimental results and the simulation results were analyzed. The simulation model was proved to be accurate to some extent.Overall, the research on the oscillation mechanism was mainly conducted out of consideration of dynamic analysis and structure optimization, in which two methods for optimization were put forward with significant effects, provides the appropriate guidance for the practical operation and design studies for the drill rig.