Research On Key Parts Of High-speed Vacuum Precision Planter Matched With Soybean Narrow-row-flat-dense Seeding Technique

The research is based on the project of"Research and Development of High-speed Vacuum Precision Planter Matched with the Soybean Narrow-row-flat-dense Seeding Technique"supported by the National key technology R&D program"Research and Development of Combined Equipment Matched With Large Horse-Power Tractor"(NO.2006BAD11A05).The objective of the research is to offer equipment support for the development of soybean narrow-row-flat-dense seeding technique.According to the rule of combining the theory analysis with practice, this paper has a systemic research on the cultivation model of soybean narrow-row- flat - dense seeding and matched planter as follow:With comprehensive reference to correlative information, the paper details the present situation of soybean narrow-row-flat-dense planting technique and matched planter in and aboard; discusses the agriculture characteristic and theory of yield increasement of that cultivation model.The cultivation comparison experiment on soybean narrow-row- flat - dense seeding under the condition of different between-row spacing has been carried out to study the effect of yield increasement, the results shows that between the cultivation model of soybean narrow-row- flat - dense seeding whose between-row spacing are respectively 35cm and 45cm, and the 70cm ridge cultivation, the yield increasement of 35cm narrow-row- flat - dense seeding is the most. Compared with 30cm single row, 45cm single row, 45cm double rows and 70cm ridge cultivation, the yield exceeds approximately 23.3%,8.4%,24.3% and 44.3% respectively. The experiment results would provide the basic agricultural parameter for the design of matched planter.Based on the dynamics analysis of the whole planter when be transported or works, this thesis also determines the design principle of matched high-speed vacuum precision planter as follows: balance of forces on the whole planter and forward movement of the barycenter.With the technique of CAD and CAE, the Virtual Prototyping (VP) technology is adopt to create the model of the matched 2BZJ-18 high–speed vacuum precision planter, simulate the real situation of seeding unit when works; the finite element analysis (FEA) software ANSYS 10.0 is also used to analysis the stress and strain of the frame.All the methods above make sure that the matched planter can meet the design purpose.The results of the field experiment show that, the matched planter can work and be transported normally, and the work quality can meet the requirement on one class product according to the standard《Quality Classification of Precision Seeder for Intercultivation Crop》; With well contour following, reliable transmission, normal working of every part, the planter units meet the requirement on the uniformity of seeding depth and inter-plant spacing.According to the field experiment, the seeding unit can be further optimized. The improved structure has been designed in the last chaptor. Through the theory analysis, the new scheme can solve the key technology problem of the matched planter better in some degree. However, the performance of the seeding unit should still be measured through the field experiment.