The Finite Element Analysis And Optimization Of The Key Components Of FP2500A Type Stack-Turning Machine For Organic Fertilizer

One important expression of innocent treatment and efficient utilization of agricultural wastes is using waste of livestock and poultry’s feces, crop straw waste, sludge waste to produce organic fertilizer. Ground heap fermentation is the most commonly used way to produce organic fertilizer. Regular stack-turning operation during composting is needed.Compared with advanced equipments in abroad, the level of mechanization and intelligentize of stack-turning machine for organic fertilizer developed and manufactured in China is lower. The price of imported equipment is very expensive, so it’s difficult to extension large-scale interiorly. Generalizing and realizing mechanized stack-turning large-scale at home, promoting the level of design and manufacturing quality of domestic stack-turning equipments for organic fertilizer quickly, are important and urgent problems faced by China’s organic fertilizer industries. So, researching stack-turning machines has important macroscopic significance.This paper took the conveying and crushing system of FP2500A type stack-turning machine for organic fertilizer researched and manufactured by Nanjing research Institute for agricultural mechanization as a study subject, and used Pro/E and ANSYS as mainly application softwares. The mainly research contents include:According to soil mechanics experiment, the important physical characteristics parameter values of organic fertilizer-water ratio, solidity, wet density, shear strength, cohesion, internal friction angle tangent could be obtained first. Then the change regulation of each parameter was analyzed and researched.The models of key components of conveying and crushing system were established in Pro/E. Then the assembling of conveying and crushing system of stack-turning machine was finished.The modal analysis for the models of key components of FP2500A type stack-turning machine-scrape,drive sprocket, drive shaft,body frame, stack-turning transmission system assembly in ANSYS was finished first. Then the top10natural frequencies and vibration modes of each were analyzed. From the analysis, the conclusion that resonance of each component and stack-turning transmission system would not occur could be come to. The weak link of each structure could be discovered.The design numerical value of average conveying capacity of scrape was tested. Then the finite element static analysis for scrape in ANSYS was finished. This paper used the maximum equivalent stress, the total mass, the maximum total deformation of scrape as target variables in optimization. By optimization analysis in ANSYS Workbench and comparing the effect before with the effect after optimization, the best optimization scheme could be determined.The force analysis and calculation for drive shaft of the stack-turning transmission system was finished.Then the finite element static analysis for drive shaft in ANSYS was accomplished. By finite element fatigue life analysis for drive shaft in ANSYS Workbench Fatigue, the fatigue life, the numerical value of damage, the safety factor of all parts could be got. From the analysis, the conclusion that the coefficients of fatigue’s aspects of drive shaft meet the safety requirements could be come to. So the drive shaft would not fatigue failure.