Structure design and pulverizing performance numerical simulation of straw micro-pulverizing cutter
To improve the fragmentation rate,particle size uniformity,and stability of straw micro-pulverization,a composite pulverizing method of moving and fixed cutter impact shear was proposed for the physical properties of straw,and a curved serrated blade pulverizing cutter was designed.The main factors affecting the pulverizing performance of straw and the way of fragmentation were clarified through the analysis of the shear mechanics of straw,the analysis of impact dynamics,and the mechanical analysis of pulverizing moving cutter.Based on EDEM numerical simulation,the effects of the serrated blade and smooth blade cutters on the pulverizing performance of straw were compared and analyzed.The simulation results show that when pulverizing corn straw with a moisture content of 20%,the number of connective keys of the serrated blade is 16.76%less than that of the smooth blade,the particle motion speed is increased by 15.9%,the total energy of particles is increased by 25.05%,and the impact force on the pulverizing chamber wall is reduced by 33.69%,and has a smoother working condition and lower energy consumption.
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