| Panax notoginseng is a rare Chinese medicinal material in China.In recent years,the planting area of Panax notoginseng has been increasing year by year,but the harvest of Panax notoginseng is still in the artificial harvest stage,and the harvest efficiency is low.Mechanized harvesting of Panax notoginseng is in the research stage,but there are some problems such as lack of excavation depth and interference and the choking of soil.In view of the above problems,this paper improves the structure of the excavating device of Panax notoginseng harvest.Through the soil groove test,it analyzed the influence law of excavating shovel working parameters on excavating resistance,and optimized the optimal combination under the premise of satisfying the digging depth.This paper is based on the sub-project"Research and Development of Engineering Facilities and Mechanical Equipment to Overcome the Obstacle of Panax Notoginseng Continuing Cropping System Construction",a major science and technology plan of Yunnan Province.Specific research contents are as follows:（1）Field research is located in Kunming Shilin"Yunsanqi"bionic planting factory,understand the agronomic characteristics of greenhouse notoginseng planting,determine the design scheme of excavating shovel,excavating frame and lifting separation system,through the analysis and study of the suspension mechanism,determine the use of double-rod piston hydraulic cylinder as lifting actuator.（2）UG12.0 software was used to build the model of the whole machine,and static simulation analysis was carried out on the excavating frame and connecting frame.The results showed that the maximum deformation of the excavating frame was 0.10mm and the maximum stress was 73.73MPa,while the maximum deformation of the connecting frame was 0.39mm and the maximum stress was 32.54MPa.The deformation of excavating frame and connecting frame is small,and the stress value is less than the yield strength of the material 235MPa,which meets the design requirements.（3）Virtual assembly and kinematics simulation analysis were carried out using UG12.0.The results show that the excavating device runs normally and there is no interference problem;The lifting distance of excavating device is 450mm,which can meet the requirements of digging depth.When the excavating device is parallel to the soil groove platform,the relationship between the lifting distance and the movement stroke of the hydraulic cylinder of the single rod piston is fitted by the software Origin2018,which is y=0.5x+275,providing a theoretical basis for the adjustment of the working parameters of the excavator.（4）The soil tank test bed was built to carry out the single factor test,which provided data reference for quadratic rotation orthogonal combination test.Taking the excavation depth and penetration Angle as factors,and the excavation resistance as indexes,the orthogonal combination test of secondary rotation was carried out.Regression analysis using the Desk-Expert8.0.6 software shows that the excavation depth has a greater impact on excavation resistance than the entry Angle,it is concluded that the regression equation for Y=1056.09+307.83x1+65.14x2-47.05x1x2-39.15x12.The response surface analysis shows that the interaction has a significant effect on the excavation resistance.When the excavation depth is 270mm and the excavation Angle is 12°～20°,the excavation resistance range is 1295.46N～1331.65N,indicating that the influence of the excavation Angle on the excavation resistance is weakened when the excavation depth reaches a certain depth. |
