ANALYSIS AND EXPERIMENT ON THE WORKING PROCESS OF SOIL-CULTIVATING DISC OF POTATO CULTIVATOR

Aiming at the problems of the existing potato cultivator in cultivation, such as poor effect and easy damage to seedlings, the composition structure and tillage principle of the cultivator is analyzed. Furthermore, in order to determine the volume of soil thrown by the soil-cultivating disc, that is, the main tilling indexes of JB/T7864-1999"Test methods of cultivator-fertilizer", this study makes a theoretical analysis on the dynamics of tilling device and the kinematics of tilling operation, to obtain the structural and motion parameters affecting soil cultivation. The discrete element simulation software is used for single-factor simulation analysis, to obtain the linear relationship between each factor and soil cultivation. Taking the tillage depth, cultivator forward speed and disc diameter as the factors, and the soil cultivating height as the test index, a field three-factor and three -level orthogonal test was carried out, and the optimal parameter combination was selected. The results showed that with the increase of the disc diameter and tillage depth, the cultivating height increased, and with the increase of the cultivator forward speed, the cultivating height increased first and then decreased. Through the orthogonal test of factors and the analysis of range and variance, it is determined that when the tillage depth is 105 mm, the operating speed is 5.5 km/h and the disc diameter is 475 mm, the effect of soil-cultivating disc is optimal. The results are also verified by the field test, and it can lay a foundation for the optimal design of potato cultivator.