Design On Straw Cleaning And Soil Breaking Device For Maize No - Tillage Sowing Machine

Wheat-maize planting patterns are widely used in bi-cropping areas such as Hebei province,namely,no-tillage sowing corn is implemented in the fields where wheat has just been harvested.Corn sowing after wheat harvest has a large number of stubble covering of wheat straw and the existence of uneven ground stubble,which will lead to the blocking of operating parts of no-tillage planter and cause pests and diseases such as Spodoptera exigua.However,the traditional corn no-tillage sowing opportunity produces large clods during the operation,which will affect the sowing quality.Therefore,aiming at the adverse consequences caused by wheat straw stubble,root stubble and large clods,this paper made the following research on the research goal of straw cleaning and soil crushing device of corn no-tillage sowing machine:(1)The straw cleaning and soil breaking device of no-tillage maize sowing machine was designed,and the structure and motion parameters of the cutter were determined.The turret radius of the cutter is determined through the force analysis of cutting the wheat stalks of the cutting cutter;the number of cutting cutters is determined by the analysis of the cutter cutting root enthalpy;in order to have a good sliding performance of the cutting cutter,an eccentric circular cutter side cutting edge is designed.Mouth curve;based on the cutting edge curve of the cutter and the spiral angle of the helix designed three kinds of integrated cutter,one-way separation and two-way separation;Through the analysis of the cutter path trajectory,to determine the knife shaft rotation,the knife shaft speed and cut the soil Pitch;theoretical analysis of the cutter cutting resistance and power consumption;according to the force and movement analysis of straw throwing,determine the straw throwing conditions and throwing displacement.(2)The drive system for the side boards and implements of corn straw-free cleaning and soil-scraping devices was designed.The finite element modal analysis is performed on the side plates to analyze the possibility of resonance.According to the requirements of the working speed,the parameters of the transmission system such as the gear box,chain transmission and transmission shaft are determined to ensure the normal operation of the equipment.(3)The straw-soil-cutter model was used to simulate the operation process using discrete element simulation software.The model parameters are set according to the interaction between the particles and a simulation test is performed.The lateral displacement of straw throwing was analyzed based on the three cutters at different cuttershaft speeds,and the working performance was shown based on the simulated operation results.(4)Based on the theoretical design of the implement,the implements are processed,fabricated and assembled,and field tests are conducted.The soil disturbance,straw clearance and straw lateral displacement were determined based on the three cutters at different spindle speeds.The field experiment results were compared with the simulation test results and the designed corn no-tillage planter was selected.Straw cleaning and soil devices meet relevant technical requirements.