Authors

Abstract

Aiming at the potato cropping pattern in the hilly area of southwest China, a small digging device for potato harvester was designed. First, the overall structure of the harvester was determined according to the soil physical characteristic and cropping pattern of the test site. Then, the digging shovel, the key components of harvester were designed and was analyzed the relationship between the inclination of the digging shovel and the power loss under the conditions of different digging speed, digging depth and soil bulk density by MATLAB software, and the mathematical models were established. Finally, the three-dimensional model of the whole machine was established by SolidWorks, and the simulation experiment was carried out with the model of soil particles, potato particles and potato ridges created by the discrete element (DEM) software. The simulation results show that when the working speed of the harvester is 1 m/s, the digging depth is 170 mm, and the potato expose rate is 87.3%. Under normal working conditions of the digging device, appropriately reducing the digging depth can reduce the resistance and wear of the digging shovels.

Abstract in Chinese

针对西南丘陵地区马铃薯种植模式，设计了一款小型马铃薯收获机挖掘装置。首先根据试验场地的土壤物理特性和种植模式，确定了收割机的整体结构；然后设计了关键部件挖掘铲，并利用MATLAB软件分析了在不同挖掘速度、挖掘深度和土壤容重条件下挖掘铲的倾角与消耗功率之间的关系，建立了数学模型；最后使用SolidWorks建立整机三维模型，结合DEM软件建立的土壤颗粒、马铃薯颗粒和马铃薯种植垄的模型，进行了仿真试验。仿真结果表明：当收割机的工作速度为1m/s时，开挖深度为170mm，马铃薯的明薯率为87.3%，在挖掘装置正常工作条件下，适当减小其挖掘深度，可以减小挖掘铲的阻力和磨损情况。