Study On Vibrating Subsoiling Technology And Its Key Parts

In China, the subsoilers used today are not satisfying with several obvious problems, such as insufficient subsoiling depth, huge tillage resistance, high energy cost, etc. Based on the analysis of the prevailing trend of agriculture development in China, and the local conditions in Shandong Province, this thesis discusses some theoretical analysis and experimental study of how to reduce resistance using two different vibration methods, namely, self-exciting vibration and forced vibration, in vibrating subsoiling technology. In another word, this thesis aims at meeting the requirement of agriculture development better, and increasing subsoiling depth under the condition of not increasing power supply. The content of this thesis is detailed as follows:(1) With the combination of quantitative and qualitative methods, system analysis is performed regarding the causes of vibration, the processes of reducing resistance, and the tillage principles of self-exciting vibration and forced vibration.(2) Theoretical analysis and structure design are conducted for the key part of forced vibrating unit and the one of self-exciting vibrating unit, that is, eccentric shaft and elastic component, respectively.(3) On the basis of designing test subsoiling tiller, two different indoor soil slot experiments are conducted, and a better design of vibrating subsoiling unit is achieved to reduce resistance with increasing energy cost at the same time.(4) An elastic component is added to the original subsoiling-rotary-seeder, and thus a self-exciting vibrating subsoiling unit is built up, and field experiments are conducted to test the new tiller's tillage performance.The study shows that both forced and self-exciting vibration can reduce traction resistance, however, the former increases the power cost because of the necessity of driving the vibrating part, and, contrarily, the latter does not have the corresponding cost since it does not contain a forced vibrating system. The self-exciting vibrating subsoiling-rotary-seeder with the elastic component has several advantages such as nice and sound structure, consistent performance, good adaptability in field, and high working quality. This thesis solves some common problems existent in conversation tillage in China, for instance, the tillage depth of common subsoiling-rotary-seeders is far from enough. In summary, this study gives us a new research avenue to reducing resistance and saving energy cost simultaneously in designing subsoiling combination tiller, and it is extremely valuable in both theoretical aspects and practice.