Design And Research Of Deep Loosening And Vertical Rotary Tillage And Wheat Wide-Narrow-Row Sowing Compound Machine

In this paper,a deep loosening and vertical rotary tillage and wheat wide-narrow-row sowing compound machine was designed.Deep loosening can break through the hard bottom of the plough.Vertical rotary tillage can improve soil mass structure,moisture conservation and water storage.Wide-narrow-row sowing is beneficial to the ventilation and light transmission of wheat growth and increase wheat yield.The overall structure and working principle of the compound machine was described.The suspension frame was designed according to the size and position requirements of each component.The force calculation and parameter design of the deep relief shovel were carried out.The chisel-shape deep-shovel was selected as the subsoiling component.The structure,transmission system,vertical rotary tillage unit and vertical rotary blade of vertical rotary system were designed.According to the requirements of wide-narrow-row sowing,the parallel four-link copying mechanism,the double disks ditcher with limited depth wheel,the wide-narrow-row nest-hole wheel wheat seeder,the transmission system of seeding system were designed.ADAMS software was used to simulate the kinematics of vertical rotary blade.The trajectory,displacement,velocity and acceleration curves were generated and analyzed.The simulation results show that the operation quality of the vertical rotary blade can be improved by increasing the rotating speed of the vertical rotary tillage unit or decreasing the forward speed of the machine.It was calculated that the maximum tangential resistance of a single vertical rotary blade was 63 2N,and the maximum torque of a single vertical rotary tillage unit was 174N·m.ANASYS Workbench software was used to conduct modal analysis of vertical rotary blade.The minimum natural frequency of the vertical rotary blade is 1576.2Hz,and the bottom of the vertical rotary blade is most prone to deformation.Through static stress simulation analysis,the maximum shape variable of vertical rotary blade is 5.19×10-4mm,and the maximum stress is 57MPa,which is less than the allowable stress and can meet the strength requirement in operation.The infinitely variable transmission of the seeding transmission system was designed,which could meet the requirements of rotary speed of sowing operation.Combining single seed precision sowing technology,the shape,size and number of seed metering wheel holes were determined.The seeding simulation test was carried out with EDEM software.According to the simulation results,the designed seed metering wheel was proved to be suitable.A prototype of the wide-narrow row nest-hole wheel wheat seeder was produced.The seeding test was carried out on the seeding test bed,and the data of five seeding performance indexes were collected.According to the test results,the effects of rotation speed of the seed metering wheel,belt speed and seed layer height in the seed box on the seeding performance were analyzed.The combination of working conditions corresponding to the optimum seeding performance of the seeder was obtained by comprehensive weighted scoring of the test results.The test results showed that the wide-narrow-row nest-hole wheel wheat seeder developed in this project can basically achieve precision sowing and wide-narrow-row sowing.