关键词: 玉米脱粒, 立式, 脱粒装置, 弓齿, 破碎率

Abstract: In order to reduce the size of the threshing machine and improve its versatility, a vertical threshing device with a conical outer cylinder and an axial flow threshing drum was designed to ensure the quality of threshing while controlling the size of the threshing device. The structure and working principle of the vertical threshing device were expounded, and the stress on the threshing element during the threshing process was analyzed. An archtoothed threshing element was designed, and the force of the contact between the ear and the bow teeth was simulated and analyzed using EDEM software. The optimal diameter of the bow teeth was determined to be 10 mm. The roller speed, threshing gap, and bending radius of arch teeth were used as test factors, and the grain breakage rate was used as the test index. The results showed that the grain breakage rate increased with the increase of drum speed, decreased with the increase of threshing clearance, and decreased with the increase of the bending radius of arch teeth. The roller speed and threshing clearance had a significant effect on the grain breakage rate of the vertical threshing device. Finally, the optimal drum speed of the vertical threshing device was selected as 300 r/min, the threshing gap was 80 mm, the bending radius of bow teeth was 20 mm, and the grain breakage rate was 4.67%, which meets the requirements of national standards. This study provides a new idea for developing a new type of corn threshing device.

Key words: corn threshing, vertical, threshing device, bow teeth, crushing rate