Based On Fluid-structure-heat Interaction Method To Analysis The Creep Of Trolley

Sintering machine is an important component equipment in the process of steelproduction. The trolley as a pivotal component of sintering machine, the strength andservice life is virtual. but after a certain number of years the trolley in the factory willgooseneck. This phenomenon is caused by material creep, since the trolley is made ofductile iron which has a creep characteristic.During the agglomeration the trolley carry onthe iron ore, which is ignited and agglomerated in the track.So the bad environmentmakes the trolley not only under mechanical load, such as itself dead weight，the windpress and agglomeration weight, but also the variety temperature load, which meet thecreep condition. Therefore, it is very significant to analyse creep deformation and improvedesignation of sintering trolley.Based on the analysis of the sintering pallet body structure and working principle, thearticle use3D software CATIA and preprocessing software to complete the threedimensional modeling of sintering machine body and hexahedral mesh, then establish thefinite element model according to the actual working conditions, during the intensityanalysis not only gravity load but also wind load which is calculated by FLUENT is takenin to consideration. Consider the cross bars and air thermal heat transfer coefficient, airtemperature changes over time, such as unsteady factors to calculate the temperature fieldof trolley in the sintering process by using FLUENT, then compared the inflowtemperature of bellows with exhaust temperature to verify the flow model is correct.couple the structural with flow and thermal field (heat transfer coefficient, air temperature,wall pressure, wall temperature and node position) via the interface software, byconsulting the relevant literature on the creep，depend on work condition and the propertyof ductile iron,choose the creep model and solve the creep parameters of ductile iron.Applying mechanical load and add coupled solution of temperature field as creepboundary conditions, use structural analysis software to simulate creep deformation of thebeam and compared the result with the trolley body actual deformation in factory. During the analysis of the structural strength of the trolley, this paper introduce amore accurate negative pressure caused by ventilation, making the simulation morerealistic. Due to the completion of the temperature field which is not easy to be measuredby experiment, which can provide a reliable temperature field for persons who studyingthermal fatigue and crack, By analyzing creep of the trolley in changing temperatureenviroment，this article explores the real factors of the trolley body’s main beam’scollapse，according to the fitting creep model, derive the main factors that cause the creep,and at the same time it provide certain guiding significance for the material selection oftrolley body and structural optimization.