The Finite Element Analysis And Lightweight Design Of Belt-type Sintering Machine Trolley Body

As the iron and steel industry's demand for iron ore continues to rise,existing bonanzas are no longer able to meet the usage requirements,so a large amount of lean ore must be exploited.However,the lean ore cannot be directly put into the furnace,thus it is necessary to form agglomeration by a sintering process before furnace smelting.In the modern steel production process,the sintering process has a wide range of applications.As one of the key equipments of the sintering process,the belt-type sintering machine is commonly used in sintering production at home an d abroad.It consists of many trolleys,which runs on the trolley guides on both sides to complete the process of loading,ignition,sintering and unloading of the sintered ore.During the sintering process,the trolley is subjected to a series of factors such as self-weight,the weight of the grate bars and the insulation pads,the pressure and heat transfer of the sintering ore,and the negative pressure of the bellows.The working conditions are very bad,which can easily cause fatigue damage and malfunction of the trolley.Failures in turn affect the production process and cause economic losses.Therefore,the traditional design of the trolley is somewhat cumbersome in ord er to ensure the reliability,safety and service life of the machine.The weight of the trolley has a great influence on the sintering efficiency,and t he heavy machinery also needs larger driving force during the working process to ensure its normal opera tion.Therefore,the temperature field distribution of the sintering layer and the stress distribution of the trolley is studied through thermal analysis and structural analysis,which is of great significance for the lightweight design of the trolley.Based on a large number of Chinese and foreign literatures,this paper takes180m~2 belt sintering machine trolley as a research object,uses the UDF function of FLUENT to solve the temperature field of the trolley during the sintering process,and calculates the trolley stress distribution and deformation by Workbench.A nd the corresponding lightweight schemes are proposed for the stress and deformation of different parts,and finally the weight reduction goal of the trolley is achiev ed.The main work of the thesis are as follows:(1)According to the structure and working principle of the belt sintering machine trolley,the mechanical stress and thermal stress of the trolley are analyzed by the traditional theoretical method.The differential equation of heat cond uction and the definite solution condition are given.Through the analysis of the sintering condition of the trolley,it is concluded that the heat transfer source mainly includes two aspects:the convective heat transfer of the flue gas and the heat condu ction of the heat insulation mats.(2)On the basis of the drawings provided by a company,the physical model of the trolley is established,and the non-main research objects such as grate bars and insulation pads are simplified.FLUENT is utilized to simulate the sintering temperature field of the trolley,and the temperature distribution of at different sintering moments is obtained.Firstly,the separate effects of mechanical stress and thermal stress are considered separately.Then the analyzed temperature field is added to the Workbench's thermal analysis module and the structural analysis module for coupling calculation,and the coupling temperature field,deformation and stress of the trolley are solved.Finally the rationality of the simulation results i s analyzed.(3)Aiming at different parts of the trolley and different load-bearing functions,the cross-section thickness of the side area of the trolley,the cross-section dimension of the transverse bar and the structure of the beam are optimized respective ly.And the comprehensive structural improvement of the trolley is carried out with the three schemes mentioned above.Then the analysis results of each lightweight scheme are compared with those of the original structure,the deformation and stress before and after the lightweight of the trolley as well as the safety and stability are analyzed at the same time,and finally,the feasibility of the lightweight is verified.