切片加工是三七产地加工过程中的重要环节，实现高效切片加工是确保三七加工质量的重要举措。文中设计了一种利用曲柄滑块机构驱动切片终端进行三七切片的专用设备，为实现高效稳定切片，对其中曲柄连杆结构进行优化设计是必要的。建立曲柄连杆结构优化设计数学模型，确定适合三七块料切片的边界条件，采用罚函数法获得曲柄和连杆长度的最优参数;基于有限元法对连杆结构进行静力模拟仿真分析，通过对模拟仿真数值进行分析，获得连杆最优参数值。分析结果显示:连杆的厚度对总变形最为敏感，当长度、宽度和厚度分别为400，21.325，14.707 mm时连杆变形量最小。研究结果可为三七及其他中药材切片加工设备的设计提供理论指导及参考。

Slicing is an important link in the processing of panax notoginseng, and a high standard of slicing is important to ensure the processing quality of panax notoginseng. In this article, a special device for panax-notoginseng slicing is designed by means of the crank slider mechanism, through which is the slicing terminal is driven. In order to realize the efficient and stable slicing, it is necessary to optimize the crank connecting-rod mechanism. The mathematical model of optimizing the crank connecting-rod mechanism is worked out, the boundary conditions suitable for panax-notoginseng slicing are identified, and the optimal length parameters suitable for both the crank and the connecting rod are obtained by means of the method of penalty function. Based on the finite-element method, the static simulation analysis is conducted on the connecting rod; with the aid of numerical simulation, the optimal parameters of the connecting rod are worked out. The results show that the thickness of the connecting rod is the most sensitive to the total deformation; the deformation of the connecting rod is the least when the length, width and height are 400, 21. 325 and 14. 707 mm, respectively. This study provides theoretical guidance and reference for the design of the slicing and processing equipment for panax notoginseng and other Chinese medicinal materials.