DESIGN AND EXPERIMENT OF STUBBLE CHOPPING AND SCATTERING DEVICE BASED ON 2BMFJ-12 NO-TILLAGE PRECISION PLANTER

Aiming at the problems of poor stubble chopping quality of 2BMFJ-12 no-tillage precision planter, leading to slow stubble degradation rate, inconsistent seedlings emergence, and partial surface exposure, affecting tillage and crop yield at seedling stage, the stubble chopping and dispersal device was designed. The theoretical analysis of the corn stubble picking and chopping processes was carried out. The flow field characteristics in the volute were simulated by SolidWorks Flow Simulation. The main parameters and value range affecting the working performance of the device were determined. The orthogonal experiment method of three factors and three levels was used to carry out the field experiment with the angle of broken cutter, the rotation speed of cutter shaft and the inclination angle of negative pressure blade as the experiment factors, and the qualified broken rate, the uneven coverage, the scattering distance and the power consumption as the evaluation indexes. The variance analysis and optimization of the experiment results were carried out by Design-Expert 6.0.10. The optimized combination of parameters is that when the inclination angle of the chopping knife is -10.5 degrees, the rotational speed of the knife shaft is 1120 r.min(-1), and the inclination angle of the negative pressure blade is -15 degrees, the qualified rate of chopping is greater than 93.01%, the coverage unevenness is less than 17.11%, the scattering distance is greater than 6.80 m, and the power consumption is less than 6.79 kW. The research results provide technical support for 2BMFJ no-tillage precision planter to improve stubble chopping and covering quality.