夹带损失传感器不同安装位置对籽粒检测精度的影响

为正确选取有效识别脱出混合物中籽粒和杂余的阵列式PVDF夹带损失传感器的最佳安装位置,该文通过分析6、7和8kg/s喂入量时纵轴流滚筒下脱出混合物沿纵向与横向的籽粒和杂余分布规律,选取不同喂入量时纵向与横向分布的籽粒和杂余质量比例最稳定且变化最小的位置,通过比较籽粒和杂余在下落过程中不同位置的下落速度对阵列式PVDF夹带损失传感器冲击产生电压信号相差较大且谐振影响较小的点作为传感器的安装位置;结果表明,阵列式PVDF夹带损失传感器在纵轴流滚筒下的最佳安装位置为横向X轴上i为6、纵向Y轴上j为12、法向Z轴上k为14的点,在该点安装的阵列式PVDF夹带损失传感器可以有效检测脱出混合物中的籽粒数量,检测误差在4.5%～5.26%之间。该文为切纵流联合收获机纵轴流滚筒下夹带损失传感器的安装定位提供有效依据。

Effect of different installed location of entrainment loss sensor on grain testing accuracy

In order to accurately obtain the optimal installed position of the PVDF(polyvinylidene fluoride)entrainment loss sensor,the vertical and horizontal distribution of mixed material under the longitudinal-axial drum were studied with the feed rate of 6,7 and 8 kg/s.The location installed was selected under the condition that the mass percentage of grain was most stably and the changed mass percentage of other materials was minimum with different feed rate.When the mixed materials were falling under the longitudinal-axial drum,the falling speed changed at the different location.The voltage was studied,which was produced by impact strength of the grain and other materials with different speed.It was turned out that the optimal installed position of the PVDF entrainment loss sensor was the point where i was 6 on the X axial,j was 12 on the Y axial and k was 14 on the Z axial.The differences was 4.50%～5.26% between the record number of values by PVDF entrainment loss sensor and high-speed camera.The studies provide a basis for the installed location of entrainment loss sensor under the longitudinal-axial drum of tangential-longitudinal-axial combine harvester.