College of Mechanical and Electrical Engineering, Northeast Forestry University

为提高秸秆微粉碎的碎裂率以及粒度均匀性和稳定性,文章针对秸秆物性提出了动、定刀冲击和剪切的复合粉碎方式,设计了一种弧形锯齿刃粉碎刀具。通过对秸秆粉碎过程中受到的剪切、冲击作用进行力学和动力学分析,明确了影响秸秆粉碎性能的主要因素及碎裂方式。基于EDEM数值模拟,对比分析了锯齿刃型和光刃型刀具对秸秆粉碎性能的影响,模拟结果表明：在粉碎含水率为20%的玉米秸秆时,相较于光刃型刀具,锯齿刃型刀具的颗粒粘结键数量减少了16.76%、颗粒运动速度提高了15.9%、颗粒总能量增大了25.05%、对粉碎室壁的冲击力减小了33.69%,工作状态更加平稳,能耗更低。

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 proposedfor the physical properties of straw, and a curved serrated blade pulverizing cutter was designed. Themain factors affecting the pulverizing performance of straw and the way of fragmentation were clarifiedthrough the analysis of the shear mechanics of straw, the analysis of impact dynamics, and themechanical analysis of pulverizing moving cutter. Based on EDEM numerical simulation, the effects ofthe serrated blade and smooth blade cutters on the pulverizing performance of straw were comparedand analyzed. The simulation results show that when pulverizing corn straw with a moisture content of%, the number of connective keys of the serrated blade is% less than that of the smooth blade,the particle motion speed is increased by%, the total energy of particles is increased by%,and the impact force on the pulverizing chamber wall is reduced by% , and has a smootherworking condition and lower energy consumption.

国家自然科学基金项目(51975114)