Design and experiment of noncircular gears transplanting mechanism based on pitch curve with nonfunction expression

Design documents about non-circular gears were firstly given with pitch curve functions of gears, and then tooth profiles of non-circular gears were designed according to the design principle of the gear. Aiming at the problem that it was difficult to determine the non-circular gear pitch curve when reversing, this paper studied non-circular gear pitch curve in the expression of numerical points form, and put forward a method of non-circular gear pitch curve in the expression of non-function. Therefore, this paper proposed a method that the corrected tooth top curve was expressed by the data of addendum circle's numerical point. According to the field planting experiment, manufactured transplanting mechanism has good seedling upright degree, high precision of fetching seedlings, less seedling injury and also satisfies the requirement of machine planting. The research results provided the reference for the research and development of core working parts of high speed transplanter.