Design And Test Of Hanging Yam Harvester

At present,there are two main ways to harvest yam in China.One is to harvest yam by mechanical trenching and manual excavation,and the other is to harvest yam by manual trenching and excavation.These two kinds of harvesting have high labor intensity,high harvesting cost and low efficiency.By referring to the research status of yam harvesting machinery at home and abroad and combined with the planting mode of Baiyu yam in Shandong Province,a yam harvester integrating the functions of ditching,loosening soil,breaking soil,partial separation of stem soil and backfill is designed.The whole machine scheme design of suspended yam harvester.Consult the relevant literature of the existing yam harvester at home and abroad and conduct field research on the growth and agronomic characteristics of Baiyu yam,study the functional requirements of yam harvester,and clarify the working principle of yam harvester.According to the modular design concept of the whole machine,the main structures of the yam harvester are suspension mechanism,trenching mechanism,vibrating soil crushing mechanism and backfill mechanism,and the main technical parameters of the yam harvester are determined.Design and analysis of key components of suspended yam harvester.Aiming at the key links of trenching,loosening,crushing,partial separation of stem soil and backfilling in the process of yam mechanical harvesting,the suspension mechanism with adjustable trenching depth and angle,the trenching mechanism with high stability,the vibrating soil crushing mechanism of broken soil and the backfilling mechanism controlled by hydraulic system are designed and studied.The working process of each component is analyzed and the key technical parameters are defined.Using the finite element analysis software ANSYS Workbench 2021,the mechanical analysis of the support frame and chain knife of the ditching device,the main stress parts of the yam harvester,is carried out.Through the static analysis,the maximum stress value and occurrence area of the support frame and chain cutter,the maximum deformation value and occurrence area can be obtained.Through the first six modes,the change of the natural frequency of the support frame is analyzed.The natural frequency is less than the impact frequency,and the feasibility of the mechanism is determined.Field experiment of suspended yam harvester.Taking the relevant parameters of the vibrating soil crushing mechanism of the yam harvester and the forward speed of the whole machine as the test factors,the response surface regression model with the intact rate and exposure rate of yam as the evaluation index is established by using the box Behnken test design scheme.Through the analysis of variance and response surface,the influence and variation laws of the eccentric wheel speed,the whole machine speed and the eccentric distance of the vibrating soil crushing mechanism on the evaluation index are obtained,It is optimized with the help of design expert 8.0.6 software.When the eccentric speed of the vibrating soil crushing device is 550 r/min,the forward speed of the whole machine is 150 m/h and the eccentricity is48 mm,the intact rate of harvested yam is 90.67% and the exposure rate is 92.96%,which can basically meet the needs of farmers to harvest yam.