Authors

Abstract

Aiming at the problems of low threshing efficiency and high damage rate of current threshing devices. In this study, the operational form of the threshing drum and the structure of the threshing element were innovated, and a new threshing drum with low damage and high efficiency was designed. Using EDEM software, flexible body modeling of corn kernels, cobs and whole ears was carried out. The dynamic analysis of the corn threshing process was completed and the simulation parameters were further optimized. The optimum operating parameters were analyzed by orthogonal rotational tests and response surface method with a speed of 800 r/min for the threshing drum, a clearance of 10 mm for the concave plate and 30 mm for the threshing drum. The radius of the round head of the threshing element was 5 mm. The height of the threshing element was 60 mm. The final threshing efficiency was 98.78% and the damage rate of threshing was 0.62%. The results show that the new threshing device can meet the requirements of low-loss threshing devices for corn combine harvesters and can provide a theoretical basis for the development of the theory and technical system of corn plot combine harvesters in the future.

Abstract in Chinese

针对现有脱粒装置脱粒效率低、损伤率高的问题。本研究对脱粒滚筒的工作形式和脱粒元件的结构进行了创新，设计出了一种低损伤、高效率的新型脱粒滚筒。利用 EDEM 软件对玉米籽粒粒、玉米芯和玉米果穗进行了柔性体建模。完成了玉米脱粒过程的动态分析，并进一步优化了模拟参数。通过正交旋转试验和响应面法分析了最佳运行参数，脱粒滚筒转速为 800 r/min，凹板间隙为 10 mm，脱粒滚筒间隙为 30 mm，脱粒元件圆头半径为 5 mm。脱粒元件的高度为 60mm。最终脱粒效率为 98.78%，脱粒损伤率为 0.62%。结果表明，新型脱粒装置能满足玉米联合收获机低损脱粒装置的要求，可为今后玉米小区联合收获机理论和技术体系的发展提供理论依据。