| Animal husbandry develops continuously in our country. In order to save feed, muchmore silage should be used to raise livestock. The technology of ensiling corn stalk has beentaken into account. The demand for corn stalk silage machines is increasing. As the corecomponents, shredding equipment’s research is important and urgently needed.The design of the shredding unit has a full impact on properties of corn straw silagemachine. Reasonable parameters determine on the quality of chopping and the powerconsumption. This thesis contain theory study、finite element analysis and optimization designon corn straw shredding device. The purpose is to improve its work performance and protractits service life.(1)I compare several kinds of blades on shredding cylinder and have a study on screwblade. Parameters, including equation of blade curve、sliding-cutting angle、blade angle、theswing angle and otherwise, are defined. Three-dimensional solid model of the blade is createdby Pro/E software with its parametric equation. The structural stress on the blade is analyzed.(2)The interface technology of ANSYS software and Pro/E software is used insynergetic analysis. Finite element analysis of blade contains several parts: propertydefinition、meshing、imposing loads、solving and post processing. The contour graph of theblade’s Stress and deformation distribution is obtained. The strength and stiffness of the bladeis checked and the failure-prone position of blade is founded. Several measures ofimprovement are proposed to improve its performance and extend the service life of the blade.(3)Processes of Pro/MECHANICA module’s analysis are studied. With its help,Sensitivity analysis of spiral blade’s parameters is done. Design parameters, independentvariables and optimization tasks are defined. Its structure has been optimized under thecondition of meeting the strength, rigidity and other performances. Optimized blade’s stress ismore uniform. Its abrasion and deterioration failure are reduced.(4)The axis of the shredding device is designed and its force is analyzed. I establishedthe finite element model and analyzed its stress and deformation distribution. (5)The axis’ equations of modal analysis are established and its modal analysis is donewith the help of ANSYS software. Its natural mode frequency, shape of vibration and stressdistribution are obtained. The axis’ speed avoids the resonance region. Fatigue analysis of theaxis is done and cumulate fatigue coefficient is determined. Optimization design of the axis’structure parameters is done.(6)Parts of the shredding deice are designed and their models are created. The parts areassembled and the model of the shredding drum is created. A servo motor is added to de drummodel and the parameters are defined. The model’s motion simulation is completed and theresults analysis has been done. The shredding drum runs smoothly and it meets the designrequirements. |
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