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Design And Experimental Research On Seeder Of Rice Dry Field Direct Seeding Planter

Posted on:2022-03-08Degree:MasterType:Thesis
Country:ChinaCandidate:Y P YangFull Text:PDF
GTID:2493306566461444Subject:Mechanical engineering
Abstract/Summary:PDF Full Text Request
Rice is an important food crop in my country.The continuous development of new varieties to maintain the vitality of improved varieties and adapt to the ever-changing natural environment is of great significance for ensuring food production and consolidating national food security.Agronomists cultivate a large number of rice seeds every year.How to select the best among different varieties through fast and efficient plot breeding experiments,and accurately select the most suitable rice varieties for local planting is the core issue of breeding work.However,for a long time,the planting operations of breeding experiments in our country are mainly done manually.The low efficiency of manual operations,the consistency of planting,and the poor accuracy have seriously affected the accuracy of the test results.Compared with manual operations,mechanical direct broadcast has the advantages of high efficiency,low cost,good consistency,and high accuracy.It is an effective method to improve the efficiency of breeding experiments,reduce costs,and improve accuracy and credibility.Therefore,the development of a rice dryland direct seeding planter suitable for breeding experiments is of great significance to solving the problems existing in the current seeding operations of breeding experiments.Based on the in-depth investigation of domestic and foreign breeding planters,the thesis designed and developed a rice dryland direct seeding planter according to the requirements of field rice direct seeding agronomy and rice breeding experiments.The whole machine is driven by a hydraulic four-wheel drive self-propelled chassis and predistributed seeds.Box-type seed supply,air-suction precision seed metering device,its seeding operation speed is not less than 5km/h,and the transition speed is not less than10km/h.Use three-dimensional modeling software to complete the digital modeling of the whole machine,and conduct in-depth analysis and research on the main structure,functional modules and working principles of the planter,and component selection.At the same time,the line length control of the measuring wheel + encoder is carried out.The plan is designed.Use Ansys statics analysis module to carry out static simulation of the planter frame,and verify the rigidity and strength reliability of the whole machine frame by analyzing the deformation and stress changes of the frame when the planter is working;The stress situation of the connecting surface of the vehicle bridge to verify the driving reliability and stability of the planter chassis.On the basis of static analysis,the pre-stressed modal analysis and harmonious response analysis are carried out to obtain the 1-6 vibration frequencies of the planter frame during operation to determine the vibration of the frame during operation.At the same time,analyze the frame when the frame is forced Deformation and stress changes during vibration.In addition,establish a virtual test platform for the planter,and explore the impact of ground excitation on the accuracy,uniformity and consistency of the planter’s operation in the vehicle-ground interaction system through the virtual bench test during the operation of the rice planter;through calculations The deviation rate of the seed distance when stimulated,analyze the seeding operation status of the planter after being stimulated by the ground.Carry out the field performance test of the breeding planter,randomly select the seed spacing,row spacing and seeding depth within 3m of the breeding plot as the measurement objects,and determine and calculate the reseeding rate,missed seeding rate,average qualified seeding distance and the coefficient of variation of seeding distance.,As well as the average value,standard deviation and coefficient of variation of the seed spacing,row spacing and seeding depth to verify the reliability and effectiveness of the designed planter operating system.
Keywords/Search Tags:Breeding planter, breeding experiment, harmonic response analysis, virtual bench experiment, field experiment
PDF Full Text Request
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