Discrete Element Analysis Of Tamping Coking Coal And Structural Study Of Tamping Machine

The importance of coking production as one of the vital links in the steel industry is self-evident,and the development of tamping coking is in line with national distribution of coal resources.However,the design and production of large stamping coal-charging vehicles mainly rely on the imitation of foreign models,lacking the ability to independently develop and design core components.The topic of the paper comes from the coal-based key scientific and technological projects of Shanxi.The main tasks are as follows:(1)Based on the shape and granularity of the pulverized coal in the field,the discrete element model was creacted by EDEM.The parameters of pulverized coal particles were set up and verified by the experiment of virtual simulation and the proportional experiment of tamping equipment.After the tamping experimental device had been designed and producted,the simulation results and experiment data were compared based on orthogonal experiment method.The side wall pressure of discrete element simulation was basically consistent with the pressure during experiment,which indicated the created pulverized coal particles can well simulate the mechanical properties of the actual pulverized coal.(2)The dynamic model of tamping machine was created in ADAMS according to the analysis of working devices of stamping coal-charging vehicle.The height curves of the tamping hammers and the force-time curves at the bearing seats of the tamping machine were obtained by dynamic simulation.The lifting heights of the dynamic model were basically the equivalent to the actual lifting heights and the force-time curves of the bearing seats provided the foundation for the further size optimization of tamper frame.(3)The influence factors of briquette density were analyzed and summarized.Based on the discrete element model of pulverized coal and the multi-body dynamics model of tamping machine,the ADAMS and EDEM coupling interface EA-LINK was used to study the size of pulverized coal particle,pulverized water content,and tamping hammer lifting height to pulverized coal tamping density characteristics.Based on the simulation results,the optimal pulverized coal tamping parameters were concluded.(4)The maximum load of the tamping machine in the working process was obtained based on the dynamic mechanical analysis.The frame and bearing seats of the tamping machine were meshed by HyperMesh.Taking the reduction of the tamping machine frame quality as the optimization objective,taking the thicknesses of frame plates as design variables,taking the stress and displacement as constraints,the size optimization of tamping machine frame was carried out.Based on the results of size optimization,the thickness of the frame plates were reselected,and fatigue durability was verified through fatigue analysis.It was judged whether the frame would resonate in the working process after optimization.In this paper,combined with multi-body dynamics and discrete element method,the influence of related factors on the tamping density characteristics of pulverized coal were analyzed,which provided a basis for selecting appropriate tamping parameters.Based on the multi-body dynamics simulation results,the size optimization was performed.The fatigue and modal analysis of the optimized frame were crrried out,which provided a valuable reference for the new structure design of the working equipment.