Optimization Study Of Powder Ridge Tool Based On Soil Fragmentation Distribution

Tillage technology of smash-ridging is a new deep-plowing and deep-slitting technology in China.One-time tillage can directly crush and suspend the soil vertically and suspend into ridges.Compared with traditional tillage,powder ridge technology can increase crop yield,but the current powder ridge machine is in the actual cultivation process The middle and upper layers have poor soil fragmentation and large soil clumps,while the middle and lower layers of soil particles are finely fragmented.This soil fragmentation distribution is not conducive to crop planting and water storage and moisture retention.Therefore,it is of great significance to study the cutting process of the rotary cutter of the powder ridge machine,to explore the unreasonable mechanism of the distribution of soil crushing degree in the height direction,and to optimize the structure of the rotary cutter.In this thesis,the SPH-FEM coupling method is used to establish a soil-rotation tool dynamics simulation model,and the accuracy of the simulation model is verified by physical experiments.Then,the simulation model is used to analyze the cutting mechanism of the rotation tool and the soil crushing degree in the height direction The reason for the unreasonable distribution,and an innovative design of the upper tool structure.Finally,based on the upper tool structure,using a quadratic regression general rotation combination design method and simulation test,the mathematics of the middle and lower tool structure parameters and operation performance was established.The model optimizes the structural parameters of the middle and lower layers of cutters.The results show that the established soil-rotation tool dynamics simulation model has high accuracy.The reason for the unreasonable distribution of soil fragmentation in the height direction is that the upper soil is in a weakly constrained state during the cutting process of the rotary tool.Most of the soil is thrown out by the rotary tool after being cut once due to the centrifugal effect,and the number of auxiliary cutting between the tools is less The cutting tools are not enough to cut the soil,and the middle and lower layers of soil are repeatedly cut by the cutter due to the constraints of the upper soil,and the number of auxiliary cutting between the tools is more.The cutting tools are more sufficient to cut the soil,and the middle and lower layers of soil are small.Install a rotary cultivating knife at the positions of 300 mm and 340 mm,The cutter can adapt to different depths of cultivation environment,and the crushing degree of the upper layer of soil with the current rotary cutter is increased by52.6%,48.1%,and 43.12% at 30 cm,40cm,and 50 cm depths respectively.And then adjust the incremental angle of the adjacent blade clamps at the middle and lower positions.The incremental value is 10.5 ° and the blade insertion depth increase value is 3.5mm,the crushing ratio of the upper and middle layers of soil is 0.87,the crushing ratio of the middle and lower layers of soil is 0.92,the crushing degree is distributed in the height direction from upper to lower,and the size of the soil after cultivation Agronomic requirements,while the power consumption width ratio and the original turning tool are reduced by 13.87%.