基于离散单元法的氢氧化锂粉末螺旋输送机优化设计  

Optimization design of the lithium hydroxide powder screw conveyor based on the discrete element method

作　　者：郭华 周健[1] 张金建 沈芳明 李红军[1] GUO Hua;ZHOU Jian;ZHANG Jinjian;SHEN Fangming;LI Hongjun(School of Mechanical Engineering,Zhejiang Sci-Tech University,Hangzhou 310018,China;Zhejiang Quzhou Yongzheng Lithium Technology Co.,Ltd.,Quzhou 324000,China)

机构地区：[1]浙江理工大学机械工程学院,杭州310018 [2]浙江衢州永正锂电科技有限公司,浙江衢州324000

出　　处：《浙江理工大学学报（自然科学版）》2023年第2期237-245,共9页Journal of Zhejiang Sci-Tech University(Natural Sciences)

摘　　要：针对氢氧化锂粉末在螺旋输送机上出现的输送不稳定、不均匀等问题,采用离散单元法对氢氧化锂粉末螺旋输送机进行了优化设计。首先,通过离散单元法建立氢氧化锂粉末螺旋输送机的仿真模型;其次,以螺旋轴径、螺距和转速为试验因素,以平均质量流量和输送稳定性变异系数为评价指标,设计了三因素三水平Box-Behnken正交试验;最后,分析各试验因素对输送稳定性的影响,并进行参数优化和出料口螺杆的优化设计。试验结果表明:各因素对氢氧化锂粉末螺旋输送机输送稳定性的影响大小依次为:转速、螺距、螺旋轴径。以平均质量流量333 g/s为设计目标,当参数组合为螺旋轴径26 mm、螺距75 mm、转速108 r/min时,得到最小输送稳定性变异系数为20.65%,但未满足输送稳定性要求。为进一步提高输送稳定性,基于以上参数组合,将出料口位置处的螺杆设计成无螺旋叶片,仿真试验表明:输送稳定性变异系数为8.96%,满足输送稳定性变异系数小于10%的要求。该研究可为氢氧化锂粉末螺旋输送机的优化设计提供一定的参考。For the problems of unstable and uneven conveying of lithium hydroxide powder on the screw conveyor, we optimized the design of lithium hydroxide powder screw conveyors using the discrete element method(DEM). Firstly, the simulation model of lithium hydroxide powder screw conveyors was built based on the discrete element method(DEM). Secondly, a three-factor, three-level Box-Behnken orthogonal test was designed with the spiral shaft diameter, pitch and rotational speed as the test factors, and the mean mass flow rate and coefficient of variation of transport stability as the evaluation indexes. Finally, the influence of each test factor on the conveying stability was analyzed, and the parameter optimization and optimal design of the discharge screw were carried out. The test results show that the three most influential factors for the conveying stability of lithium hydroxide powder screw conveyors are rotational speed, pitch, and screw shaft diameter in turn. With the average mass flow rate of 333 g/s as the design goal, when the spiral shaft diameter is 26 mm, the pitch is 75 mm and the speed is 108 r/min for the parameter combination, the minimum conveying stability coefficient of variation of 20.65% is obtained. However, the transport stability requirements are not met. To further improve the conveying stability, based on the combination of the above parameters, the screw at the discharge position is designed without spiral blades. Simulation tests show that the coefficient of variation of transport stability is 8.96%, which meets the requirement that the coefficient of variation of transport stability is less than 10%. This study can provide some reference for the optimized design of lithium hydroxide powder screw conveyors.

关 键 词：氢氧化锂粉末 螺旋输送机 离散单元法 Box-Behnken正交试验 输送稳定性 

分 类 号：TH224[机械工程—机械制造及自动化]