Design And Test Of Helical Tooth Auger Strip Soil Preparation Device

With the progress of science and technology,agricultural farming machinery and tools are gradually updated.However,under the influence of thousands of years of traditional farming culture,China’s current farming method is still intensive farming.Although it has achieved the purpose of increasing grain yield in a short period of time,excessive ploughing for a l ong time leads to serious soil degradation.In order to alleviate the above problems,this paper,based on the common continuous spiral auger,combined with China’s agrarian requirements and related theories of strip cultivation,designed a spiral tooth aug er strip land preparation device,and tested its land preparation performance through tests.The main working part of the soil preparation device is the helical tooth auger.The outer diameter,pitch and Angle of the helical tooth auger were determined acco rding to the related requirements of belt cultivation and the theoretical analysis and test in the early stage.The monomer on the basis of ordinary stirring dragons,blade radius according to the scale of the log can be divided into continuous helix mixing vane and tooth helix mixing dragon blade two parts,at the same time,the tooth helix mixing dragon blade edge curve design for Archimedes spiral,increase the rate of the soil soil soil preparation device,both on the field of straw vines there was a broken effect,can prevent the straw winding.Based on the principle that the non-smooth surface of dung beetles does not adhere to soil in bionics,the helical auger blade is designed as a non-smooth surface to reduce soil adhesion during operation.Through the kinematics analysis of the helical tooth auger,the main factors affecting the soil preparation effect of the helical tooth auger are as follows: the rotating speed of the helical tooth auger,the forward speed of the machine and the entry Angle.Based o n the laboratory soil tank test bed of the College of Engineering,Northeast Agricultural University,the single factor test and the quadratic rotation orthogonal combination test were carried out with the broken soil rate of the helical tooth auger as the evaluation index,and the rotating speed of the helical tooth auger,the forward speed of the machine and the soil entry Angle as the test factors.Specific test contents and results are as follows:(1)By analyzing the results of the single factor test,i t is concluded that the rate of broken soil increases with the increase of the rotational speed,decreases with the increase of the forward speed of the machine and tools,and decreases with the increase of the penetration Angle.When the rotary speed of the helical tooth auger is 175r/min～325r/min,the forward speed of the machine and tool is 0.2m/s～0.3m/s,and the soil entry Angle is 20°～25°,the relationship with the soil crushing rate is roughly linear.(2)The quadratic rotation orthogonal combination method was used to carry out the three-factor and three-level test,and the variance analysis of the test results was carried out with Design Expert 10.The results showed that the significant effects of the test factors on the rate of soil crushing were the rotational speed of the spiral auger,the forward speed of the machine and the entry Angle.Through multi-objective optimization analysis and optimization model,the optimal parameter combination of the soil preparation device was obtained as follows: the forward speed of the machine and tool is 0.22m/s,the rotational speed of the screw auger is 325r/min,the soil entry Angle is 20°,and the optimal soil crushing rate is 98.45%.According to the optimal parameter combination after optimization,the validation test was carried out,and the results showed that: when the forward speed of the machine was 0.22m/s,the rotary speed of the screw auger was 325r/min,the soil entry Angle was 20°,and the optimal soil crushing rate was 97.02%.The optimized data had a good fit with the validation test,and met the requirements of cultivation.It provides reference for the design and evaluation of strip tillage soil preparation device.