关键词: 丘陵山地；平台悬挂式农具；撒肥机；肥料分布, 变异系数

Abstract:  Aiming at the problem of low utilization rate of organic fertilizer caused by small plots, wide varities of crops, and narrow roads in hilly and mountainous areas, the platform suspension fertilizer spreading machine is successfully developed by using the mountain articulated wheel variable wheelbase tractor as the platform of the platform suspension machine. It realized the requirements of wide, efficient, uniform and stable fertilization in hilly and mountainous areas, reduced production costs and improved agricultural mechanization rate. The movement of organic fertilizer particles was analyzed by EDEM software to understand the law of fertilizer stress and speed change. The prototype test and test analysis are realized at last. Based on the DesignExpert orthogonal test design and the central composite surface response design, it is concluded that the significance of the influence of various factors on the coefficient of variation of the uniform distribution of fertilizer on the test index from large to small is the walking speed of the fertilizer distributor, the rotational speed of the fertilizer distributor disk, and the height of the handle at the discharge port. Based on the principle of the minimum distribution coefficient of variation, when the walking speed of the fertilizer distributor is 0.6 m/s, the rotating speed of the fertilizer distributor disc is 700 r/min, the height of the handle at the discharge port is 40 mm, and the minimum coefficient of variation is 8.24%. It realizes the requirements of wide and efficient, uniform, and stable fertilizer spreading in hilly and mountainous areas, reduces production costs and increases the comprehensive mechanization rate of crop cultivation, seeding, and harvesting to 60%.

Key words: hill and mountains, platform hanging farm implements, sprinkle fertilizer machine, fertilizer distribution, coefficient of variation