Authors

Abstract

Aiming at the low comprehensive utilization rate of corn straw resources, a straw kneading and cutting conveyor suitable for corn harvester was designed to improve the utilization rate of corn straw resources. The workbench module of ANSYS is used to carry out modal analysis of the two blades, and it is determined that the vibration frequency will not cause damage to the blade sweeping bore. By changing the structure of the movable blade shaft, the speed of the blade shaft can be reduced while ensuring the effect of straw crushing and collecting. In order to determine the best working parameters, three-factor and three-level orthogonal test was carried out with blade arrangement, blade shaft speed and length of feed straw as test factors, and the crushing rate of straw as evaluation index. The results show that the main factors influencing the crushing rate of straw are blade shaft speed, blade arrangement and the minor factor is the length of feed straw. Finally, the optimum combination parameters, blade arrangement, blade shaft speed 400 r/min and whole plant feed with straw, were determined. The corresponding straw crushing rate was 96.39%. The research meets the requirements of straw crushing and can provide technical scheme for comprehensive utilization of corn straw.

Abstract in Chinese

针对玉米秸秆资源的综合利用率低的问题，设计了一种适用玉米收获机的秸秆揉切输送装置以提高玉米秸秆资源的利用率。利用ANSYS的workbench模块对两种刀片进行模态分析，确定振动频率不会导致刀片扫膛受损；通过改变动刀轴的结构在保证秸秆粉碎及收集效果的同时降低刀轴转速以减少能耗。为确定最佳工作参数，以刀片排列方式、刀轴转速及喂入秸秆长度为试验因素，以秸秆粉碎率为评价性指标，进行三因素三水平正交试验，结果表明影响秸秆粉碎率的主要因素为：刀轴转速、刀片排列方式，次要因素为喂入秸秆长度。最终确定最优组合参数刀片为混合排列、刀轴转速400r/min、喂入秸秆为整株，对应试验的秸秆粉碎率为96.39%。该研究满足秸秆粉碎要求可为玉米秸秆综合利用提供技术方案。