Research On Cutting Performance Of Swing Weeding Implements

For swinging weeding implements when working with low weeding rate,high cutting resistance and low working efficiency,velocity mismatch,and the problem of poor energy utilization based on independent research and development of the project team of swinging weeding implements as object,through the screw theory and ADAMS simulation and LS-DYNA simulation methods,research on tools rotating speed of cutter,crank rotational speed,drawing speed with hasty,cutting resistance movement parameters,such as cutting performance indicator such as the relationship between the influence law according to its best motion parameters optimized combination.The thesis contents and conclusions are as follows:(1)The kinematic reference configuration was obtained according to the working principle and motion characteristics of the machine,the kinematic model of the swinging weeding implements was established based on the screw theory,and the path and velocity equations of the cutter were solved.Based on the kinematics model,the mathematical model of matching the transverse and longitudinal velocities of the machine and the tool was established,and the relationship between the transverse and longitudinal velocities and the structural parameters of the cutter was obtained.Based on this,suggestions for the selection of structural parameters were given.The research of transverse velocity matching shows that the transverse maximum velocity ratio changes with the increase of the radius of the tip respectively.It decreases with the increase of the radius of the blade;It decreases with the increase of blade Angle;With the increase of the number of evenly distributed blades.The maximum longitudinal velocity ratio increases nonlinearly with the increase of cutter tip circle radius and unavoidable leakage cutting area.The kinematic simulation shows that the error between the experimental and predictive value is less than 5%.According to the results of velocity matching,it is suggested to take the radius of blade tip circle 160mm,the radius of blade root circle 40mm,the blade inclination Angle 45°and the number of evenly distributed blades 3 to reduce the loss of velocity ratio.Combined with the actual structure of the machine,the transverse velocity ratio is 0.117 and the longitudinal velocity ratio is 11.2mm/rad.(2)Based on LS-DYNA simulation software,the visual dynamic cutting model of the machine was established and the cutting mechanism was analyzed.The relationship between motion parameters and cutting force was studied by single factor analysis method,and the quadratic regression orthogonal design method was used to carry out the simulation test to obtain the regression equation of cutting force.The research of cutting resistance shows that the cutting resistance increases first and then decreases.The results of single factor analysis show that the maximum cutting force decreases first and then increases with the increase of cutter speed.It increases with the increase of traction speed;The crank speed increases with the crank speed.The maximum cutting force after optimization was 8.93N,23.29%less than that before optimization,and the optimization effect was obvious.(3)Carry out field test,design scientific test method,calculate cutting force with weighing method,measure cutting force with dynamic and static analyzer,verify the consistency of test data and theoretical predicted value according to test results,so as to verify the correctness of the proposed theory and the effectiveness of optimization.The experimental results show that the error between the predicted value and the experimental value of velocity matching and cutting resistance does not exceed 10%,which verifies the correctness of the theoretical research and the effectiveness of the simulation.At the same time,compared with the pre-optimization period,the cutting resistance decreased by 18.42%,and the optimization effect was obvious.According to the test results,the motion parameters of the machine and tools should be the cutter speed 3640r/min,the crank speed 350r/min,and the traction speed 0.31m/s,which can not only ensure the operating efficiency and quality of the machine and tools,but also reduce the cutting resistance and power consumption.The research is expected to provide technical guidance for the improved design and field operation of swing and rotary weeding implements.