Design And Experimental Study Of Clamp-type Red Bean Harvesting Devic

The planting area,total production output and total export volume of red adzuki bean in China rank first in the world,but its mechanized harvest mostly depends on the modified combine harvester,which has a large mechanical harvest loss and reduces the economic benefits of red adzuki bean planting.Therefore,according to the agronomic requirements of red bean harvest,using the methods of theoretical analysis,modeling and simulation and experimental research,a more in-depth research has been done from the aspects of the analysis of the physical and mechanical properties of Red Bean Stalk in the harvest stage,the design of the overall structure and key components of the harvest operation device,simulation analysis and harvest performance test.The main research contents and research process are as follows:(1)The requirements of agronomic characteristics of Adzuki Bean in harvest period were investigated,and the physical parameters of Adzuki Bean stem were calibrated by physical measurement method;The mechanical properties of Red Bean Stalk were studied by electronic universal testing machine.The variation laws of critical tensile force and maximum shear force of Red Bean Stalk were obtained by using Origin software through linear regression analysis.It provides basic data support for the establishment of Red Bean Stalk simulation model,the design of key components of harvesting device and the establishment of test parameters.(2)The EDEM discrete element simulation software was used to establish the particle model of the flexible stem of adzuki bean.The simulation effect of the motion state of the cutter directly cutting the adzuki bean stalk and the claw cutting adzuki bean stalk was compared.This provides a theoretical basis for reducing the mechanical harvesting vibration of adzuki bean by clamping and cutting harvesting method and reducing mechanical damage.(3)Use Solidworks three-dimensional drawing software to establish threedimensional models of each part of the harvesting device.Theoretical analysis of the structure size and kinematic force of the clamping conveying mechanism and the double disc cutting mechanism is carried out.Motion simulation is used to simulate the assembly and interference detection of the whole machine,and the movement trajectory of key components is theoretically analyzed.Obtain the main factors that affect the performance of the harvesting device to ensure the stability,continuity and reliability of the harvesting device.(4)According to the experimental design principle of response surface characteristics,the response surface analysis was carried out with the rotating speed of the cutter,the cutting angle and the forward speed of the whole machine as the experimental factors,and the cutting efficiency of the adzuki bean stalk,the harvest damage rate and the cutting quality of the stalk as the evaluation indicators.To optimize the test,use Design-Expert software to conduct regression model establishment,variance analysis,significance test and interaction factor analysis on the test results.Finally,through comprehensive analysis of parameter optimization and test verification,the optimal parameter combination is obtained: the cutter speed is 520r/min,when the cutting angle is 20°,and the forward speed of the whole machine is0.3m/s,the cutting efficiency of the harvester is 3 plants/s,the damage rate is 1.31%,and the cutting quality is 97.95%,which proves that its operating performance is good and meets the needs of the work.