Research On Resistance Reduction And Machine Performance Of Steel Belt Drive Micro Tiller

The micro tiller that currently available on the market are suitable for narrow space about 300 mm.They are driven by the reaction force when the cutter cutting the soil.There tillage speed changes with the soil firmness,which makes it difficult to control the machine,increase the labor intensity.The structure of the micro tiller is redesigned and the reduce resistance of knife roll is studied.That has a great significance for reduces the labor intensity,improves the working adaptability,the efficiency of land cultivation and the quality of soil tillage of the micro tillers.This paper propose a steel belt drive micro tiller,analyzes the movement and force of the knife,and redesign the cutter heads of the tiller in combination with the design requirements.The strength of the tool was preliminary analyzed.ANSYS/LS-DYNA was used to simulate the soil cutting process of the original knife roll and the redesigned knife roll,research the resistance and soil cutting process of the knife roll.The performance of the steel belt drive tiller and the working effect of the knife roller were tested.The main conclusions of this paper are as follows:(1)Solve the problem of poor uniform speed and difficult operation of the micro tiller.It is proposed a new structure of micro tiller.The power of the drive wheel is directly transmitted from the cutter shaft to the ground wheel through the steel belt drive system,and the ground wheel drives the machine to achieve uniform speed.At last,complete the design of the main parts and structure of the steel belt drive micro tiller.(2)The motion and force of the knife roll is analysed and the static analysis of tool's strength is completed.The analysis results showed that the maximum combined force of the 300 mm tiller knife roller and the 200 mm tiller cutter roller was respectively lower than that of the original machine tool by approximately 14.6% and 6.6%.The strength of the redesigned tool can theoretically meet the requirements of use.(3)The process of soil cutting is analyzed based on ANSYS/LS-DYNA.The numerical simulation results show that the average shearing resistance of the 300 mm and 200 mm knife roller is reduced by 21.09% and 4.70%,respectively,compared with the original machine tool,which indicates that the maximum force in the knife roller cutting process is reduced.The average cutting resistance in cutting process of cutting blade with 300 mm tillage width is 153.92 N,and the average resistance of blade cutting process with 200 mm tillage width is 119.85 N,which shows that the blade cutting process of 300 mm tillage blade is smoother in cutting process.The power analysis results shows that sheared earth power at 300 mm tillage is greater than the shear earth power at 200 mm tillage width,which is basically consistent with the results obtained from experience of rotary tiller power calculation.(4)The performance experiment of the micro tiller.The test results show that the scheme for adding driving wheels to the machine is feasible.The handling of the machine is improved,the operation intensity and the uniform cultivation speed is better.The main technical parameters of the redesigned machine can meet the requirements of the standard,and the tillage quality of the micro tiller which equipped with a ground wheel drive system is better than that the original one.The tillage depth of the 300 mm knife roll is deeper than that of the 200 mm knife roll,the depth of the original one's knife roll is the smallest,which means that the maximum cutter resistance of the 300 mm knife roll is less than 200 mm.