| Panax notoginseng,as a unique rhizome of Chinese medicinal materials in Yunnan,is a key industry of modern agriculture in the hills and mountains of Yunnan,and high medicinal value is an important economic source for farmers to increase their income and get rich.Because panax Notoginseng is planted under shady shed in hilly and mountainous areas with sticky soil,there is no combined harvester applicable to panax notoginseng harvest in the market due to complex terrain.Inorganic easy to use,inorganic available,artificial harvest intensity,low efficiency,seriously restrict the economic development of Panax notoginseng industry.In view of the above problems,this paper relies on the national key research and development program "Panax Notoginseng combined harvest technology Research and intelligent equipment creation and application(2022YFD2002004),put forward the whole machine design scheme,for improving the key working parts of the research and test.Specific research contents and conclusions are as follows:(1)Field investigation of Panax notoginseng planting base,investigation of Panax notoginseng planting agronomy and measurement of parameters.The physical parameters of soil and the triaxial dimensions of panax notoginseng stem during harvest were determined to provide data support for the design of key components.In-depth understanding of the needs of users for harvesters,combined with the standards of root harvesters,to determine the combined harvester dig out rate ≥95%,loss rate,damage rate ≤5% operating standards.(2)According to the combined harvest index,put forward the design scheme of the whole machine,through the comparison of schemes,choose the design model more suitable for hills and mountains,and elaborate the working principle of the combined harvester.According to the planting and agronomy of panax notoginseng,the harvest width of the whole machine is determined to be 1500 mm,and the power consumption of each key working component of the self-propelled Panax Notoginseng combine is determined.(3)Complete the design of primary conveying device,secondary conveying device,lifting device and hydraulic turnover unloading device.Through the transport device screen surface movement characteristics analysis,analysis of the impact characteristics of panax notoginseng stem and transport screen surface,the establishment of panax notoginseng stem-soil complex movement model and dynamics model,analysis of the impact characteristics of panax notoginseng stem and transport screen surface,determine a conveyor lifting Angle of 22°,screen surface length of 1.5m,lifting screen rod diameter of 12 mm,The spacing between adjacent bars is 30 mm.Through the kinematic analysis of the junction of Panax notoginseng stem in the primary and secondary conveying device,the installation Angle of the secondary conveying device is determined to be 24°,the length of the screen surface is 500 mm,and the structure of the lifting device is described in detail,and the working principle is elaborated.(4)DEM-MBD coupling simulation is carried out on the conveying and lifting device.The coupling simulation of the conveying and lifting device model and the rhizome model of Panax notoginseng established by EDEM was established by Recur Dyn,and the speed change and stress in the conveying process of Panax notoginseng were analyzed.(5)Design the platform of the conveying and lifting device for processing and testing.The factor range of orthogonal combination test is determined by single factor test of secondary conveying device and lifting device.Box-Behnken test was designed for secondary conveying device with conveying Angle,conveying speed and conveying device bar spacing as test factors and turnover rate and conveying rate as test indexes.Through the analysis of the test data,the mutual influence and regression equation between the relevant factors are obtained.Orthogonal tests were designed with the Angle of the secondary conveying device,the speed of the secondary conveying device,the Angle of the lifting device and the speed of the lifting device as the test factors and the conveying rate as the test index.Through the analysis of the test data,the best working parameters of the conveying and lifting device are obtained: when the speed of the secondary conveying device is 1.0m/s,the Angle of the secondary conveying device is 24°,the Angle of the lifting device is 15° and the speed of the lifting device is 0.5m/s,the conveying rate reaches the maximum 96.2%.(6)The high-speed photography technology was used to photograph the working parameters of the secondary conveying device,and through the analysis of the movement trajectory of the stem of panax notoginseng,the turnover phenomenon in the conveying process was explained. |
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