目的 为青饲机青贮块成型后的套袋装置中的撑袋结构设计一款基于连杆开槽的偏置曲柄滑块与双滑块组合的间歇型机构，以实现可停歇的撑袋功能，并具有急回特性，提高工作效率。方法 分析人工撑袋过程，进行撑袋机构的设计，推导该机构的停歇时间与连杆滑槽长度的数学关系式，通过Matlab优化偏置曲柄滑块的杆长参数，并利用Solidworks进行建模仿真，模拟撑袋机构的运行，对比分析3种不同行程速比系数下撑袋机构杆长参数与各自运动特点。结果 从3组数据中选取1组相对合适的参数进行公式验证，得出撑袋机构具有停歇功能和急回特性，仿真结果与解析公式计算结果一致。结论 撑袋机构设计合理，满足工艺要求，为青贮块的自动化装袋提供了可行方案。

The work aims to design an intermittent mechanism based on the combination of the connecting rod slotted offset crank-slider and the double-slider for the bag-supporting structure in the bagging device used after the formation of silage block in fodder machine, so as to realize the bag-supporting function of stopping and emergency returning, thus improving work efficiency. The artificial bag-supporting process was analyzed to design the bag-supporting mechanism and deduce the mathematical relationship between the stop time of the mechanism and the length of the connecting rod slot. Then, the rod length parameters of the offset crank-slider were optimized by Matlab, and Solidworks was used to establish model to simulate the operation of the bag-supporting mechanism. Finally, the rod length parameters and movement characteristics of the bag-supporting mechanism under three different stroke speed ratio coefficients were compared and analyzed. A set of relatively suitable parameters was selected from three sets of data to verify the formula, indicating that the bag-supporting mechanism had the function of stopping and emergency returning, and the simulation results were consistent with the calculation results of the analytical formula. The bag-supporting mechanism is reasonably designed, which meets the technological requirements, and provides a feasible solution for the automatic bagging of silage blocks.