基于逆向工程的搅浆刀作业性能界定与关键设计参数研究

水田搅浆是基于稻作制度的独立机械化作业环节,搅浆刀是进行搅浆农艺处理的专用刀具,但目前缺乏针对搅浆的农艺界定及搅浆刀专用设计参数研究.本文利用逆向工程技术获取搅浆刀的关键几何参数,并对搅浆作业和搅浆刀的设计方法进行定义.通过与常规旋耕刀(R245)进行分析对比提出搅浆刀的专用设计参数,进而通过田间试验进一步探讨搅浆刀的...

Performance and Design Parameter Definition on Puddling Knife Using Reverse Engineering

Evolution of agronomic practices has led to the classification of paddy production machines. Specialized machineries also imply differences of functional performance among different types of soil engaging tools. Each class of rotatory tiller knives thus needs to be developed with its specific optimized designs. Puddling is an independent mechanized field operation. Puddling knife has been well evolved from long history of paddy production and industry development. However, proper definition on mechanized puddling and the design theory for puddling knife is lacking. An inverse engineering approach was adopted to quantify the geometric parameters of a market available puddling knife. Puddling operation and the design principle for puddling knife was defined. A rotary tiller knife (modeled R245) was used for comparison purpose and a field experiment was conducted to illustrate functional performances of the puddling knife. Results showed that rank intrusion effect was a key factor guaranteeing the functionality of puddling. Therefore, the key parameter of puddling knife design was defined as side blade rank angle. It was the integrated effect of the side blade rank angle and the side blade width that determined the puddling performance of the knife. Compared with R245, the puddling knife was featured with its side blade rank angle, which static value was higher than the dynamic value. While the R245 had a flattened side blade (i.e. 0° of rank angle). In the front blade section, both the puddling knife and the rotary tiller knife had a similar geometry. Field experiment further proved an improved performance of the puddling knife as compared with R245, either in puddling quality and straw burial. The result also implied the need to apply inverse engineering tools for the design of all other types of soil engaging tools.