| The crushing of sweet potato vines stem is a key link in the process of sweet potato harvest,and it is also a relatively time-consuming and labor-consuming link.The existing sweet potato vine-laying machines in China have problems such as low vine-laying efficiency,poor effect,high energy consumption,and easy winding machines of vines during operation,which seriously affect the development of full mechanization of sweet potato.In view of the current situation of sweet potato vines machinery in China,combined with the analysis and research on the existing sweet potato vines machinery and related vines machinery at home and abroad,based on theoretical analysis and verification test.A biaxial sweet potato vines returning machine was designed.The main research contents and conclusions are as follows :(1)Study on physical and mechanical properties of sweet potato vine.Introduced domestic sweet potato planting agronomy : growth shape,planting mode.The elastic modulus analysis,moisture content,breaking force and shear force of sweet potato vine stem were measured.The results showed that the farther away from the root of the vine,the higher the moisture content,the maximum breaking force and shear force were 81.73 N and 92.47 N,respectively.(2)Structure design and analysis of biaxial sweet potato vines returning machine.The three-dimensional model was built by UG software,and the overall structure,working principle and structural parameters of the biaxial sweet potato vines returning machine were designed.Including picking device design and vines device design,picking device design includes rod design,seedling device design includes blade design.The vines picking device and vines beating device were designed,and the key components were designed.The mechanical properties of the vines in the process of vine throwing were also designed.Through the design and research on the transmission system of the biaxial sweet potato vine returning machine,the minimum rotation speed of the blade was obtained.ANSYS software was used to carry out the static simulation analysis of the lever and the knife to verify the rationality of the design research.(3)Experimental study on biaxial sweet potato vine returning machine.The effects of different factors on the test indexes were obtained by single factor experiments.On this basis,the orthogonal design combination experiment of three factors and three levels was carried out.The regression es Tab.lishment,aboriginality test analysis and response surface analysis of the experimental results were carried out by Design-Expert software.The optimal operating parameters were obtained by optimizing the model : the rotation speed of the rod roller was 1943.87 r / min,the gap between the rod and the ground was 20.24 mm,and the spacing between the rod was 131.85 mm.The test indexes were as follows : the qualified rate of the broken length of the stem and leaf was 94.45 %,the stubble height was 32.44 mm,and the potato injury rate was 0.28 %.The field comparative test results under the same operating parameters showed that the breaking length of stem and leaf was 94.32 %,the stubble height was 33.61 mm,and the potato injury rate was 0.26 %,which met the design requirements.In this paper,a two-axis sweet potato seedling returning machine is designed.By adding a vine picker,the vines creeping on the surface of the ridge are picked up and thrown back up,and the high-speed rotating seedling picker over the back is crushed.It solved the problems of low efficiency,poor effect and vine winding machine of traditional single-axis vine machine in seedling operation. |
PDF Full Text Request