| As one of China’s important food crops,corn is also an import ant raw material for feed and economic products,which has a significant impact on China’s economic development.As a new corn planting method,the large-row double-row seeding technology of corn has little research results on the supporting agricultural machinery.Most of the large-row double-row seeding methods in China are multiple-entry land for machinery,which completes land preparation and seeding operations.The increased energy consumption of implements wastes manpower and material resources.The combined tillage machine designed in this paper can complete all the land preparation and seeding operations in one go,and it provides important theoretical value and practical significance for the stable,reliable,efficient and energy-saving combined tillage machine for large ridge double-row planting technology.On the basis of summarizing the development status of no-till and rotary tiller seeders at home and abroad,this paper uses a combination of theory and practice to take the agronomic requirements of double-row sowing of corn as the starting point.The theoretical analysis,finite element simulation analysis,Field experiments and other methods were combined to study and discuss the structure,parameters and performance of key components of the lar ge ridge double-row rotary fertilization planter,which provided theoretical support for the design and production of the whole machine and its key components.The technical references and specific research contents are as follows.(1)Through a large number of readings,analyze the working characteristics of the existing combined no-tillage and rotary tillage equipment,sort out the existing problems of the existing large ridge and double-row land preparation and seeding machinery,and use the CATIA three-dimensional software based on the soil characteristics of the Northeast region.Completed the design of the 2BFG-4220 corn large ridge double-row rotary tiller fertilizing planter.In addition,the article detailed the mechanism parameters,working paramet ers,supporting power and technical route of the implement.(2)Based on the design of the whole machine,the key components of the machine are designed and analyzed,mainly including the structure and size design of the frame,the design calculation of the rotary ridge device,the design calculation of the four-bar profiling mechanism,The selection of the seed metering device,the design calculation of the transmission system,etc.,complete the processing and manufacturing and assembly of the whole machi ne.(3)This paper uses ANSYS finite element analysis software to perform static analysis on the frame and the profiling mechanism,and obtain the displacement,stress,and elastic strain analysis cloud diagrams.The analysis shows that the design of the f rame and the profiling mechanism is reasonable and meets the actual operation Stiffness and strength requirements.And optimize the processing of the parts that may fail,reduce the occurrence of fracture or failure,and improve the stability of the machine.(4)A single-factor field test was performed on the whole machine,and the forward speed of the unit,the transmission ratio of the ground wheel and the seeding disc were selected as test factors,and the variation coefficient of seeding uniformity,the variation coefficient of seed depth and the replay missed index were used as evaluation indicators.The Design-Expert 8.0.6 software was used to explore the influence of test factors on the evaluation index,and the optimal operating parameters were found,that is,the forward speed of the unit was 3 km / h,and the transmission effect of the ground wheel and seeding disc transmission ratio was 1.1.The test data was integrated and compared with the existing equipment to prove that it meets the agronomic requirements of double-row sowing in large ridges. |
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