Optimization And Design Of The Whole Machine And Main Working Parts Of Air-pressure Subsoiler

According to the problems of high resistance and high energy consumption of airpressure subsoiler,the vibration characteristics and modal analysis of the whole airpressure subsoiler were carried out,and the optimization and improvement scheme of the whole machine was put forward.The air-pressure subsoiler was redesigned,and the optimal shovel shape was obtained by response surface method,which was verified by soil trough test,and the subsoiling effect of the new subsoiler was compared.Specific research is as follows.(1)From the point of view of mode and vibration of the whole machine,the external excitation sources of the air-blown subsoiler are optimized as ZS1115 single cylinder direct injection engine and air compressor engine in Chang Chai.In the field test,the excitation frequency of the diesel engine is1100r/min,and the excitation frequency is 37 Hz and 10.5Hz at the rated speed.In order to avoid the natural frequency of the air-blown subsoiler(24.13-37.36 Hz for the first to third order),Optimal design is carried out to avoid the first-order natural frequency.After optimization,the diesel engine is eliminated,and the steering gear is connected with the tractor power output shaft to provide the power of the air compressor.Remove diesel engine.(2)According to the force analysis of air-blown subsoiler,the main structural factors affecting the drag of subsoiler are air pressure,the shape of shovel surface and soil disturbance coefficient.According to the structural parameters affecting the drag of subsoiler,a new type of air-blown subsoiler is designed,and the modal simulation analysis of the new subsoiler is carried out.Compared with the original subsoiler,the modal of the new subsoiler is improved by 58.2%,and the structural reliability is greatly improved.(3)EDEM simulation analysis,the physical parameters of soil determine the accuracy of this discrete element simulation.In order to obtain the physical parameters of soil accurately,the soil retrieved from the field is virtually calibrated.Firstly,the physical parameters that have a significant impact on the stacking angle are screened,and finally,the optimal combination of soil parameters is obtained by using the optimization function.Input the final parameters into EDEM for simulation,and compare the simulation results with the actual stacking angle test,it is found that the stacking angle has high similarity with the stacking shape.(4)The modal simulation and EDEM-CFD coupling simulation analysis of the new subsoiler are carried out,and the movement process of soil particles is clearly understood.When the new air-blown subsoiler works under pressure,the disturbance of high-pressure gas on soil particles is greater than that of the original subsoiler.(5)The soil bulk density of the new air-pressure subsoiler decreased obviously before and after subsoiling,which was 11.1% lower than that after subsoiling.The drag resistance of the new subsoiler is 44.08% lower than that of the original subsoiler.After calculation and analysis,it can be found that the specific resistance SDF of subsoiling decreases by 12.7%.