Research On The Design And Simulation Of The Yam Harvester With Deep Roots And Crops

The cultivation of Chinese yam has a long history in China.In 2015,the cultivation area of Chinese yam in the whole country has reached more than 100,000 hectares,among which the cultivation area of Chinese yam in shandong province has reached 11,847 hectares.The yam mainly adopts mechanical furrowing,artificial auxiliary way,parts is given priority to with artificial operation,low efficiency and high cost,harvest in the process of skin damage and fracture phenomenon,at present only part of the collection of furrowing,to earth,take the function such as yam yam harvester,due to the excavation depth,Lou Shou,high damage rate,outstanding problems.Technology is still immature.How to develop a new all-in-one yam harvester under the condition of low yam breakage rate has become the key research content.Therefore,based on the research and analysis of Chinese yam harvester at home and abroad,this paper designs and develops a Chinese yam harvester integrating ditching,soil breaking,soil loosening and soil separation.The structure of yam harvester designed and developed will mainly include ditching mechanism,suspension mechanism,transmission mechanism and vibration separation mechanism.Among them,the main function of the earthbreaking and trenching mechanism is to break and trench the soil,and to open deep ditches on both sides of the yams to provide storage space for the harvest of yams.The suspension mechanism is fixed on the traction support of the rear suspension of the tractor to fix the lifting mechanism for controlling the lifting of the ditching mechanism and the vibration mechanism;The transmission mechanism provides power for the whole yam harvester;The vibration separation mechanism is followed up to realize the separation of vibration soil and vegetable soil.Aiming at the problems such as the high breakage rate in the harvest process of Chinese yam,this paper will make an in-depth analysis of the various forces that Chinese yam is subjected to in the mining and harvesting process and their internal relations to the deformation of Chinese yam,focusing on the analysis of the stress and strain relations and the anti-fracture ability of Chinese yam.Single factor experimental study was carried out to obtain the mean value of related physical parameters of Chinese yam.Orthogonal experimental study was carried out with three factors,diameter,moisture content and loadingspeed,to determine the influence of different diameter,moisture content and loading speed applied to yams on their tensile,compressive and breaking forces.By comparing the physical characteristics of yam,it is determined that the root of yam should be less affected by the force in the direction of easy breakage when designing and operating the yam harvester,so as to reduce the probability of the occurrence of yam fracture,and provide mechanical basis for the spatial layout and movement of the yam harvester.Through modular design and development,the whole machine of yam harvester determines the important structure composition of suspension mechanism,transmission mechanism,earth-breaking and ditching mechanism and vibration separation mechanism.According to the main working parameters of yam harvester,determine the cutting efficiency of ditching mechanism,the movement speed of ditching chain knife,the cutting thickness of ditching mechanism and the external resistance in the work,and calculate the power consumption of each part of yam harvester,and then determine the total power consumption of yam harvester and other characteristic parameters.At the same time,the key mechanism of the whole machine is studied and analyzed,including the selection of suspension mode in the suspension mechanism,the design of the suspension frame,the design of the rotating device of the groove opening mechanism,the design of the transmission mechanism and the spatial layout.The design of support frame,screw soil discharging mechanism and tensioning mechanism in ditching mechanism;The vibration mechanism is designed and developed to separate yam from soil.The above mechanism is analyzed and studied in detail,and its working principle is clarified,so as to provide reference for the design and structural selection of the following complete machine.Static and dynamic analysis was carried out on the support frame of the yams harvester by using finite element software.The maximum stress area and its value,the maximum deformation area and its value in the static state and working motion of the support frame are explored,and the variation of its vibration frequency is analyzed from the modal analysis.Through the simulation,the stress,deformation and vibration of the support frame were observed,and the stress and motion of the support frame during the working process were understood more clearly.Paper for growing depth differences,yams of different varieties of the whole machinepart trenching mechanism analysis of flexible structure,design of yam harvester trenching mechanism can realize trenching mechanism and the adjustment of the Angle between the ground,can adapt to different working depth and multi-angle location,and the main shaft rotate and brace non-interference in each other.The working efficiency of the trench-opening mechanism can be greatly improved by adjusting the tensioning force of the trench-opening chain through the tensioning mechanism.The significance of this paper is to solve the problem of efficient harvest of Chinese yam,which is of great significance to promote and promote the strategy of "poverty alleviation" and "rural revitalization" vigorously implemented in China,and to provide technical guarantee for people's income.