摘要：为了研究供料口处物料呈现的不均匀现象, 分别建立了重力型和水平型2种供料方式下的垂直螺旋输送机计算模型, 采用离散元法, 借助EDEM软件, 通过试验和标定的方式对模拟参数, 如进口速度、时间步长和颗粒属性参数进行确定, 进而确保模型和参数选取的可行性;分别对2种供料方式进行模拟, 以颗粒数标准偏差为评价指标。结果表明:与重力型供料相比, 在相同的操作条件下, 水平型供料方式在供料口取样区域的物料不均匀度更高, 物料输送的均匀性更低, 螺旋转速的改变对2种供料方式下取样区域颗粒质量分布的均匀性影响较大, 针对重力型和水平型供料方式给出了结构改进建议。

关键词：垂直螺旋输送机；供料方式；离散元法；力链网络；颗粒不均匀度

Abstract：In order to research the phenomeno of uneven conveying, two calculation models with different feeding mode of vertical screw conveyor were built, those were gravity type and horizontal type. The discrete element method and the software of EDEM were used. The simulation parameters, such as inlet velocity, time step and granule attribute parameters, were identified, thus the feasibility of model and parameters were ensured. The two models were simulated respectively. Standard deviation of number of granules was selected as the evaluation index. The results show that compared with the gravity type, granules of sampling region in the feeding rim of the horizontal feeding mode have higher evenness and lower transporting uniformity. This two feeding modes are significantly affected by screw rotation. Some advice is given for the improvement of the two feeding types. The study results have a certain preference for the structure design of feeding rim in the screw conveyor.

Keywords: vertical screw conveyor；feeding mode；discrete element method；force chain；granules unevenness