模辊式生物质压块成型模孔受力分析及参数影响研究

Force analysis and prameters impact study on die hole of the biofuel briquette machine

针对模辊式生物质压块成型机的成型模孔,通过理论分析和ANSYS仿真,研究了秸秆物料在模孔中的受力变化规律以及模孔参数对压强的影响,并建立了正交异性物料挤压成型的压强数学模型。通过正交试验,验证了模孔参数对压块成型的影响,并确定了玉米秸秆成型的最优参数组合。结果表明:秸秆物料在模孔内所受最大压强随锥角、长径比的增大而增大;物料在模孔中的成型过程可分为压缩、成型、保型3个阶段;在试验范围内,模孔的长径比、锥角、物料含水率及粒度均对秸秆压块的松弛密度影响显著,且影响顺序为长径比>含水率>粒度>锥角;以松弛密度为评价指标时,最优参数组合为长径比6∶1、含水率15%、粒度5 mm、锥角10°。

The following article targeted on the molding die hole of biomass briquette machine and established a pressure math model of extrusion of the orthotropic material by researching the influence of stress with force variation and parameters of die hole in theoretical analysis and ANSYS simulation research. Through orthotropic experiment, the effect of die hole parameters in briquette molding and the best combination of the parameters were verified. As results, the maximum pressure received by straw material in die hole was increasing as taper angle and draw ratio increased. The process of molding could be divided into three sections as contraction, molding and shape maintenance. In the experiment, the die hole draw ratio, taper angle, material moisture content and particle size had a remarkable influence on relaxation density of straw briquette in the order of draw ratio〉 moisture〉 size taper angle. Using relaxation density as the index, optimal combination is draw ratio 6∶1, moisture of 15%, size of 5 mm and taper angle of 10 °