【作者】 林兆花；

【导师】 杨坚；

【作者基本信息】 广西大学 ， 农业机械化工程， 2004， 硕士

【摘要】 水稻机械行栽技术具有浅栽、秧苗无返青期等诸多使水稻增产的优点，而且克服了水稻抛秧所产生的秧苗杂乱无序、疏密不均、后续工作困难以及不适合较小田块作业等弊端。因此，该技术的推广应用有着广阔的前景。2ZB-8小型水稻移栽机是适用于丘陵地区的小型水稻行栽机械，在实际应用中，该机存在各行摆秧量不一致，摆秧不够均匀等问题，因此，有必要对其核心工作部件—有序行抛机构进行虚拟研究，以提高整机的工作性能。 本文测定了三种土壤钵苗的主要特征参数，并根据这些参数建立了水稻钵苗的虚拟模型；分析了影响有序行抛机构工作性能的主要参数，构建了有序行抛机构的参数化虚拟模型，并通过物理试验和仿真试验结果的对比，对虚拟模型进行了精度验证；通过正交仿真试验研究，对有序行抛机构进行了优化。优化结果表明：(1)当分行板水平倾角为45°，夹角为90°时，分行板的工作性能较好。(2)喂秧斗斗口宽度为80mm，倾斜板的水平夹角为45°时，可以较好地满足喂秧要求，并克服钵苗堵塞的问题。(3)将现有水稻移栽机振动排秧盘前端弹簧在振动排秧盘底板上的安装位置由现在的35mm调整为85mm，V型槽的厚度由0.5mm加厚到0.65mm，可以使振动排秧盘的横向和纵向振动一致性变异系数分别降低61.04％和39.85％，从而提高了水稻移栽机的摆秧一致性和均匀性。更多还原

【Abstract】 The row orderly transplanting technology can plant rice seedlings lowly without re-green period, which can increase the output of rice greatly. This technology can avoid many disadvantages brought by rice seedling cast technology. Rice seedling cast technology transplants rice seedlings disorderly and unevenly which makes the later work difficult to do, and is unfit for working in small fields. So, it has a bright future for the row orderly transplanting technology to spread and apply 2ZB-8 mini-type rice seedling transplanter is a mini-type seedling row -transplanted machine fitting for the hill area. But in practical application, the quantities of transplanted seedlings of each row are different and the seedlings are uneven in the same row, also there are some other problems with this machine. So, it is necessary to make a virtual study on it’s core component-ordinal casting mechanism, to improve the working performance of the whole machine.In this dissertation, rice seedlings of three different kinds of soils were measured for their main characteristic parameters. Main parameters that affect the working performance of the ordinal casting mechanism were analyzed. A parameterized virtual prototype model of the ordinal casting mechanism was built and validated by comparing physical experiments results and virtual experiments ones. Through interacted virtual experiments, the structure ofordinal casting mechanism was optimized. Optimizing results indicate that:1) When the row separating board’s horizontal inclination is 45 degree and the contained angle is 90 degree, the working performance of the row separating board is much better.2) The rice seedling feeding bim can meet the feeding need of the rice seedling better, when the entrance width of the rice seedling feeding bim is 80mm and the horizontal inclination of the inclined board is 45 degree.3) Adjusting the installation site of the front springs on the vibratory seedling feeding plate of the existing machine from 35mm to 85mm, and the thickness of the V form slots from 0.5mm to 0.65mm, can make the horizontal and vertical variation coefficient of the vibration consistency of the vibratory seedling feeding plate reduced by 61.04% and 39.85% respectively, thus can improve the seedlings consistency and homogeneity of the rice seedling transplanter.更多还原