Simulation Study On Operation Performance Of Powder Ridge Device Of Land Preparation Powder Ridge Machine

Powder ridge technology is a new type of farming method that uses powder ridge machines to deeply plough,loosen,break and ridge the soil without disturbing the soil layer.The cultivated land after powder ridge operation generally increases production and income by 10%-30%,improves crop quality and improves agricultural ecology.At present,the research of powder ridge machines and tools is still in the primary stage,lack of theoretical basis,and the R&D and optimization process of machines and tools is slow.This paper takes the powder ridge device of a new land preparation powder ridge machine as the research object,uses the discrete element method to calibrate the contact parameters of the soil model,constructs the soil powder ridge device simulation model,simulates and analyzes the operation performance of the powder ridge device under different working conditions,constructs three kinds of powder ridge drum structures according to the different distribution of pick,and compares the three structures,It provides research ideas and methods for the R&D and optimization of powder ridge machines and tools.The main research work and conclusions are as follows:(1)The virtual test calibrates the soil contact parameters.The calibration results are as follows:the soil-soil recovery coefficient is 0.345,the soil-65mn steel static friction coefficient is 0.6,and the JKR surface energy is 1.29J/m~2.The relative error between the soil simulated accumulation angle and the real accumulation angle after calibrating the parameters is 0.8%.(2)The rotating speed,operating speed and depth of the powder ridge drum are selected as the working condition parameters to simulate and analyze the soil crushing performance,soil throwing performance and power consumption of the powder ridge device.The results show that within the range of working condition parameters selected in the study,the significant degree of the three parameters on the performance of crushed soil is depth,rotating speed and operating speed from large to small;The significant degree of influence on soil throwing performance is depth,operation speed and rotation speed from large to small;The significant degree of influence on the power consumption of powder ridge drum is depth,rotating speed and operating speed from large to small;The polynomial regression model of three performance indexes and working condition parameters is obtained.(3)According to the different distribution modes of the pick on the surface of the powder ridge drum,13-11°(the number of axial single row pick is 13,and the included angle between the straight line where the pick is installed and the axial direction of the powder ridge drum is11°),11-11°and 13-22°,three kinds of powder ridge drum structures are constructed,and simulated and compared.The results show that the 13-11°distribution of silt ridge drum has better soil crushing and throwing performance;Compared with 13-11°distribution,the average power consumption of powder ridge drum is reduced by 7.5%,and the operation stability is better.