Structural analysis of the transportation and the power transmission parts for design of a self-propelled and small-sized Chinese cabbage harvester

摘要

In Korea, the mechanization rate of the seeding and transplanting work is 5% and the harvesting work is 13.3%. When the Chinese cabbage is transported from the harvested location to the collection part, the cabbage may be damaged due to the transportation speed, mechanical vibration, and contact with the mechanical parts. Power transmission need to be designed considering transmission efficiency, failure stress, and fatigue stress. Objectives of this study were to conduct 1) kinematic analysis of thetransportation part to minimize the cabbage damage, and 2) stress and fatigue analysis of the power transmission part to optimize the component materials and dimensions. Transportation speed was from 0.2 to 1 mis at a 0.2 m/s interval, and the length ofthe transfer link was 19, 22, and 25 cm. For the power transmission part, stress and fatigue were calculated using commercial software (midas NFX) for different materials, numbers of teeth, and pressure angles of the main sprocket gears as a result of the kinematic analysis of the transportation part, the optimum transfer speed of the Chinese cabbage was 0.4 m/s, the length of the link was 19 cm, and the width of the transportation part was 66 cm. And result of stress analysis, the safety factor of SCR420H material was more than I and the safety factor ofSM45C was 0.48. The fatigue analysis results showed no significant difference according to the material and pressure angle. In order to improve the reliability of the simulation, field tests and validation would be necessary.