Simulation Analysis And Optimization Research Of Crawler Travelling Device Of Rotary Drill Rig

In the components of the crawler travelling device of the rotary drill rig,the crawler frame and the balance beam were components which mainly subjected to loads and are easily damaged.In this paper,the rigid-flexible coupling simulation analysis of the crawler travelling device was carried out,and the bearing capacity of the track frame and the variation of the deformation and stress distribution under different working conditions were obtained.The finite element method was used to analyze the deformation and stress distribution of the balanced beam under different working conditions.On this basis,the structure and size of the balanced beam were optimized.After reviewing the relevant literatures at home and abroad,the paper summarized the domestic and foreign research status of rotary drill rig crawler travelling device and topology optimization method.In order to study the deformation and stress changes of the crawler frame during the walking process of the rotary drill machine,the dynamic simulation analysis of the crawler travelling device was carried out by the rigid-flexible coupling method.Based on the force analysis of the balanced beam and the finite element analysis results,the optimized design of the structure of the balanced beam was proposed.The structural characteristics of the track tensioner of the rotary drill rig were introduced,and the tension required for the tensioning on both sides of the track was calculated.According to the relevant parameters of the rotary drilling machine,the driving force and the driving power required for the travelling device in the straight road,climbing and unilateral brake steering conditions were calculated.The rigid-flexible coupling model of crawler travelling device of rotary drill rig was established and simulated.The straight road,the climbing and the unilateral brake steering of the drill rig were selected as the research road conditions,and the rigid-flexible coupling simulation analysis of the track frame under the tower stand up and down was carried out.And the strain-stress status of the crawler frame under various working conditions were obtained.The results show that the load distribution of the load roller under the condition of the straight road and tower down,andcalculate the average force of the roller.And then the result was compared with the theoretical calculation.The force values at the connecting nodes in the rigid-flexible coupling simulation results of the crawler frame were extracted,and the restraints were applied at the connection points between the crawler frame and the balanced beam and the front axle.The static finite element analysis of the track frame was carried out,and the analysis result was similar to the rigid-flexible coupling results.According to the results of the force analysis under different working conditions,the static finite element analysis of the balanced beam was carried out,and the deformation and stress distribution of the balanced beam are obtained.Based on Optistruct software,the optimal beam structure optimization scheme was designed,the size optimization design and the free shape optimization design of the balanced beam were carried out.Under the premise of setting the constraint response and the objective function,the thickness of the balanced beam was optimized,and the dimensional optimization results of the balanced beam thickness was 182 mm,and the maximum deformation of the equalized beam was less than 3mm.On the basis of the size optimization results,the upper limit of the displacement constraint was 3mm,the upper limit of the stress constraint was 140 MPa,the free beam shape was optimized for the balanced beam and the balanced beam structure with optimal performance was obtained.After optimization,the maximum stress value of the balanced beam was 133 MPa,and the volume decreases from 0.559m~3 to 0.527m~3.