Design And Research On Bionic Double Disc Opener With Drag Reducing

In order to realize the sustained and stable development of agricultural resources,protecting the land resources avoid soil erosion in the black soil area of Northeast China.From the end of the 20 th century,we have been improving the no-tillage system.The furrow opener is the key working part on the no-till seeder.The traditional opener often sticks soil during the ditching operation,which changing its working trajectory and causing the traction resistance to increase,and the seeding furrow is difficult to reach the requirements,which in turn affect crop emergence rates.Through the analysis of the ditching process of the double disc opener,the tillage resistance is mainly generated by the interaction between the disc opener and the soil,and the model of the interaction between the disc opener and the soil was established.The ditching process is equivalent to three processes,disk cutting soil,soil movement and slipping between soil and disk.The classical mechanical formula is used to calculate the tillage resistance of the disc opener in each process.In this paper,the no-tillage sowing device was used as the experimental object,and the disc opener was used as the specific design optimization component.Based on the convex in the head of beetle and the ridge in the back of pangolin,the non-smooth surface was studied.Then combined bionic structure units were designed to apply on the surface of disc opener,reducing the resistance during its working process and improving energy efficiency.The ANSYS / LS-DYNA software was used to simulation the interaction between the bionic disc opener and the soil,and the resistance and energy consumption were obtained during its process.By using the experimental optimization design technique,the influence of the bionic structure on the tillage resistance was explored.The results were as follows: the angle between bionic element ?(°),the spacing between the convex(mm),spherical cap height(mm)and a ball cap diameter/ length of the wedge(mm).And the best solution was achieved.Three kinds of bionic coupling disc openers and common disc opener were selected for soil test.The soil moisture content is 18% and 22% respectively,and three tillage speed are 0.6 m/s,1 m/s,1.4 m/s under the conditions of a comprehensive test,each test is repeated 3 times.Through the soil tank test vehicle built-in data acquisition,processing system to obtain the tillage resistance in the ditching process.The results showed that under the same test conditions,the tillage resistance of the bionic coupling disc openers are significantly smaller than that of the ordinary disc opener.When the tillage speed is 0.6 m/s and the soil water content is 22%,the maximum drag reduction rate of the disc opener DISC3 is 13.21%.The maximum average drag reduction rate of the bionic coupling disc is 8.76% under various water content and tillage rate,which proves that the bionic coupling disc openers have better reduction of the resistance.