摘要
通过收获期平贝母的田间和实验室测定,探寻其几何参数、摩擦力等物理力学特性。采用数理统计方法对收获期平贝母的几何特性进行分析,得出了两种平贝母的主要几何特性指标值的变化区间;通过摩擦试验,对收获期平贝母筛分物透筛过程中力学特性进行测试,采用数理统计方法,得出了两种平贝母的摩擦系数和休止角。基于以上物理机械特性分析,设计平贝母等级筛分机主要参数:筛孔形状为长圆形孔,上层筛孔尺寸为13×20mm2,中层筛孔尺寸为9×18mm2,下层筛孔尺寸为7×10mm2;通过其摩擦系数和休止角的测定和分级筛的运动和动力学分析,确定筛分物在筛分时的速度取值范围7<v BD<9rad/s和加速度取值范围4<a<13m/s2。
Based on the field and lab measuerement in harvest time, Physical and mechanical properties of fritillaria ussuriensis maxim （FUM） are researched. Geometrical properties of FUM are analyzed using mathematical statistics method, and the variation sections of main index values of two kinds of FUM are obtained. Mechanical properties of FUM outsifting in screen penetrating process are tested by means of friction experiment, the friction coefficient and angle of repose of two kinds of FUM are obtained using mathematical statistics method. Grade sieve machine is designed based on the analysis of mechanophysical properties of FUM. The main parameters are： shape of sieve pore is rectangle, screen diameter is 20mm, sieve pore dimension of upper layer is 13×20mm^2, middle layer is 9×18mm^2, and under layer is 7×10mm^2. By testing of friction coefficient and angle of repose and movement and dynamics analysis of grade sieve, outsifting velocity is 7〈 vRD 〈9 rad/s and acceleration is 4〈a〈13m/s^2 in screening process.
出处
《中国农机化学报》
北大核心
2013年第5期141-145,共5页
Journal of Chinese Agricultural Mechanization
基金
黑龙江省教育厅面上资助项目(11551320)
关键词
平贝母
物理机械特性
等级筛分机
关键部件
设计
fritillaria ussuriensis maxim
mechanophysical properties
grade sieve machine
key component
design
