The Design Of Small-sized Castor Harvester And Cutting Device

Castor is an oil crop with high economic value and high market demand,but in the actual production and processing,harvest has always been an urgent problem to be solved.With the development of the castor industry,the use of machinery instead of manual harvesting is of profound significance for improving the harvesting efficiency and yield of castor.Based on the harvesting principle of existing agricultural material harvesting machinery and the characteristics of castor plant growth,this paper designed a slanted double-elastic roller with disc cutter-type castor harvesting machine.The main research contents are as follows:(1)Field measurement of castor physical property parameters,including statistical analysis of castor fruit growth law,castor main stem diameter distribution law,measurement of castor plant maximum growth range,determination of castor planting mode;using computer electronic universal test The machine studied the mechanical properties of castor,including measuring the joint force of castor-fruit stem,fruit stem-branches,and studying the shearing properties of castor stem under static loading.The results provide a theoretical basis for the design of harvesting devices and cutting devices.(2)According to the physical and mechanical properties of castor,determine the harvesting principle of the comb brush type,and design the structure of the harvesting device and the cutting device;on this basis,determine the overall arrangement of the working parts according to the working characteristics of the harvesting machine,and The transmission system of the whole machine is designed;according to the actual working conditions,the basic parameters of the whole machine are determined;the power distribution of each working part is determined,and the transmission ratio of each stage transmission is determined.(3)Using the analytical method,the cutter structure is designed,including determining the effective working length of the cutter,the length of the minor cutting edge,the cutting edge angle and the number of cutter distributions,and the theoretical value range of the cutter speed and the machine forward speed.The kinematic model of the inclined elastic toothed roller is established.The optimal inclination of the elastic toothed roller is established by analyzing the movement loading of the stem in the working area of the drum.Depending on the geometric relationship between the castor plant and the roller,the length of the elastic toothed roller is determined.The drum spacing and the arrangement of the elastic teeth are designed,and the elastic tooth structure is developed.(4)Establishing the finite element model of castor stalk cutting,and analyzing the cutting process of trapezoidal knife,curved knife and rectangular knife;taking trapezoidal knife as the research object,thecutting knife stalk stage and tear stalk was studied.The stress distribution state of the stalk during the stage;in the process of cutting simulation,the stalk incision volume evaluation index was established,and the influence of different slip angle and blade angle on the stalk incision volume was studied.The virtual center combination test was intended to study the cutting.The influence of blade angle,slip angle and cutter angle on the cutting force and stem cutting volume,and determined a set of optimal cutter structural parameters;using Adams to photometrically model the cutting process of the cutting blade,and Establish a cutting efficiency evaluation index(one knife cuts the stem).The effect of cutter speed and forward speed on cutting efficiency was investigated.The mathematical model between cutter speed and cutting efficiency and forward speed and cutting efficiency was achieved.Finally,a set of optimal cutter operating parameters was determined.The research results of the project can provide theoretical basis for the development of other agricultural material harvesting machinery.