Aiming at the problem of low screening rate (high soil content) of FUM， triaxial mean size and critical damage pressure of FUM and soil were measured, by means of FUM and soil aggregate Statistical analysis of triaxial dimensions and mechanical properties test. The results showed that the triaxial size of FUM and the soil aggregates on the screen was not significant, and the critical extrusion force value of FUM and the soil aggregates on the screen was significant. Based on this conclusion, the efficient separation scheme of FUM and soil aggregates by screening and kneading method was proposed. The efficient separation test device for FUM was constructed. The optimum range for calculating the kneading force of screening and kneading device was 20-40N, and the value range of the kneading monomer thickness was 0.2-0.4cm. The quadratic regression orthogonal rotation test scheme was designed, the results showed that the influence of the feeding amount, the square term of the feeding amount and the square term of the conveying screening speed on the screening rate was very significant, and the kneading force , the interaction between feeding amount and the speed of the conveyor screening had a significant impact on screening rate. Feeding amount and the square term of the speed of the conveyor screening had significant effects on damage. Kneading force, interaction between feeding amount and conveyor screen speed, interaction between feeding amount and kneading force, and the square term of feeding amount had significant effects on damage. By DesignExpert.V8.0.6 software, the optimal parameter combination was obtained: feeding amount of 0.68kg/s, conveyor screen speed of 0.38m/s, kneading force 36N, screening rate of 80.5%, damage rate of 12.6%, respectively. Field tests showed that the average screening rate of the separator was 79.18%, and the average damage rate was 13.34%, which could meet the agronomic requirements of mechanized harvesting of FUM.

In order to improve the problems of low flatness, low stubble removal rate, and high work intensity of farmers, the land leveler for mixing slurry and burying stubble in the paddy field is designed. The stubble pressing device of the paddy field stirring stubble grader is developed, and the key components are designed. The diameter of elastic teeth is 5 mm, and the number of elastic teeth is 33. The designed width of the flatland carriage is 290 mm, the length is 3 500 mm, the width of a single shovel is 100 mm, the length of a single shovel is 50 mm, and the number of flatland shovels is 19. Using the designed elastic tooth model, single factor and threefactor threelevel orthogonal tests are carried out in EDEM simulation software. The effects of elastic tooth shaft speed, elastic tooth pressing depth, and forward machine speed on flatness and stubble removal rate are studied. The single factor test results show that with the increase of the forward speed of the machine, the rotating speed of the spring teeth, and the pressing depth of the spring teeth, the stubble removal first increases and then decreases, and the flatness first decreases and then increases. The multifactor test results show that it is determined that the rotation speed of spring teeth is 320 r/min, the forward speed of machines and tools is 4 km/h, and the reduction depth of spring teeth is 12 cm as the optimal solution. By comparing field test and simulation test, the machine meets the requirements of slurry mixing and land preparation before rice transplanting. The research results can lay a foundation for the development of paddy field stirring stubble grader.

In order to clarify the effects of microwave drying parameters on moisture content and temperature of sorghum,the continuous drying test is carried out on the tunnel microwave dryer using the japonica sorghum “Longza 10” as raw material. The influence of magnetron tubes arrangement and microwave action distance on the sorghum drying uniformity of the experimental dryer is simulated and analyzed by HFSS software. The results show that with the increase of power per unit mass in the range of 2-6 W/g, the extent of moisture content is accelerated first and then gradually decelerates and the temperature of grain decreases. With the increase of drying time per cycle in the range of 1.02-5.0 min, the extent of moisture content is significantly increased and the grain temperature increased significantly. With the increase of air velocity in the range of 0.0-2.0 m/s, the extent of moisture content is decreased and the temperature of grain decreases slightly. The simulation analysis shows that the uniformity of electromagnetic field distribution is better when the magnetron tube of the dryer is arranged in “three two three arrangement way” and when the microwave action distance is 250 mm. It is shown theoretically that the tunnel microwave dryer used in this experiment is beneficial to the drying uniformity of sorghum. The research results will provide theoretical and data support for the industrial application of sorghum microwave drying.