To solve problems of existing devices for sorting foreign materials from laver (Porphyra tenera), such as the low working efficiency and clogging proneness, a non-clogging equipment for sorting foreign materials was designed. In the equipment, the filter suction device was composed of several parts including a combined filtering cartridge, anti-clogging foreign-material removal device, and so on. Based on the Lagrange’s equation, dynamic modeling and simulation of suction device were carried out to analyze the effects of slit width and cylinder rotation speed on suction efficiency under multiple working conditions. Results show that the device exhibits the highest efficiency of suction filtration when the width of filtering slots and rotational speed of the filtering cartridge are 0.6 mm and 200°/s(33 r/min). Based on the simulation results, the range of the three experimental factors was determined, and the removal rates and filtration time were used as the response indexes. The three-factor and three-level experiments were designed by Minitab software, and the three-dimensional model of the response surface was established. The optimization results show that when the width of filtering slots is 0.6 mm, rotational speed of the filtering cartridge is 33 r/min, and flow rate at the discharge is 16 m³/h, the removal rate is 98.44%, and the filtration time is 2.72 min. The results provide reference for the design and optimization of equipment for sorting foreign materials from laver.

针对现有紫菜滤杂装备存在工作效率低、易堵塞等缺点，设计一种无堵塞滤杂装备，其中吸滤装置由组合式滤筒、防异物堵塞的剔除装置等部分组成。基于拉格朗日方程，对吸滤装置进行动力学建模和仿真，分析多工况下滤缝宽度和滤筒转速两个参数对吸滤效率的影响。结果表明，滤缝宽度为0.6 mm、滤筒转速为200°/s(33 r/min)时，设备吸滤效率最高。基于仿真结果，确定三个试验因子的取值范围，以滤杂率和吸滤时间作为响应指标，利用Minitab软件设计三因素三水平试验，建立响应面回归模型。优化结果表明，当滤缝宽度为0.6 mm、滤筒转速为33 r/min、出料口流量为16 m3/h时，滤杂率为98.44%，吸滤时间为2.72 min。