Segregation of dockage and foreign materials (DFM) is an unavoidable phenomenon in bulk grain and causes many problems. In this study, distributions of DFM, and shrunken and broken kernels (SBK) were determined during loading of wheat in a 10-m diameter flat-bottom cylindrical bin. Wheat was loaded through a vertical funnel (spout) into the bin from five drop heights (1.6, 2.5, 3.4, 4.3 and 5.2 m). Samples were collected using a sampling tube (29 cm diameter and 50 cm deep) inserted vertically at five locations (0.00, 1.25, 2.50, 3.75 and 5.00 m of horizontal distances from the center) along three radii of the bin for each drop height. The impurities from each collected sample were divided into five categories with different sizes (other grains, other particles, SBK, fine particles, and dust and fragments) by sieving analyses. Impurities larger and smaller than wheat kernels were categorized as large and small impurities, respectively. Drop height significantly influenced the radial distribution of fine particles, dust and fragments, but not the distribution of other grains and other particles. Fine particles and dust and fragments mainly accumulated in the center, while SBK accumulated mostly near the wall of the bin. Both true density and apparent test weight (bulk density) of unclean wheat and test weight of clean wheat significantly changed along the radius of bin. Apparent test weight of unclean wheat was minimum in the center and close to the wall of bin. Drop height did not influence true density and apparent test weight of clean and unclean wheat. Thousand kernel weight, dimensions, and sphericity of wheat kernels were similar at different radial locations of bin for all drop heights. This study can be used as a reference for further studies on grain handling and associated effects on grain grading system and design of aeration, drying, and insect control. .

堆料和异物分离 (DFM) 是散装谷物中不可避免的现象，会导致许多问题。在这项研究中，在将小麦装入直径为 10 米的平底圆柱形垃圾箱期间，测定了 DFM 和皱缩和破碎谷粒 (SBK) 的分布。小麦通过垂直漏斗（喷口）从五个跌落高度（1.6、2.5、3.4、4.3 和 5.2 m）装入垃圾箱。使用采样管（直径 29 厘米，深 50 厘米）收集样品，采样管垂直插入五个位置（距中心水平距离为 0.00、1.25、2.50、3.75 和 5.00 米），对于每个跌落高度，沿着箱的三个半径。通过筛分分析将每个采集的样品中的杂质分为不同大小的五类（其他颗粒、其他颗粒、SBK、细颗粒和灰尘和碎片）。大于和小于小麦籽粒的杂质分别归类为大杂质和小杂质。下落高度显着影响细颗粒、灰尘和碎片的径向分布，但不影响其他颗粒和其他颗粒的分布。细小颗粒、灰尘和碎片主要聚集在中心，而 SBK 主要聚集在垃圾箱壁附近。不洁净小麦的真密度和表观容重（堆积密度）和洁净小麦的容重均沿仓半径发生显着变化。不洁小麦的表观测试重量在中心和靠近仓壁的位置最小。落差不影响洁净小麦和不洁净小麦的真密度和表观测试重量。千粒重、尺寸、对于所有跌落高度，在仓的不同径向位置，小麦籽粒的球形度和球形度相似。本研究可作为进一步研究谷物处理及其对谷物分级系统和通风、干燥和昆虫控制设计的相关影响的参考。.