Design And Experimental Study On Intra-row Weeding Equipment For Soybean

The weed grown on the field has a great influence on the yield and the quality of crop for it compete with the crop for sunlight, moisture, the nutrition from soil, a nd so on. So weeding is an indispensable and key part in the field management. Weeding must to be do ne on accurate time and it requires a lot of manpower and material resource. Nowadays, it is widely adopted chemical, manpower and machine to eliminate weed. However, the mechanical weed control technology has a great advantage to the chemical weed control and the manual weed control technology when taking into account the environment, the quality of agricultural products, the intensity of lab or and the weed control efficiency. According to the position of the weed grown on the field, the weeds could be divided into two types, on the one hand the weeds that are grown between the crop rows are called inter-row weeds, on the other hand, the weeds that are grown within the line of crop rows are called intra-row weeds. Today, famers can could be succeed to eliminate the inter-row weed with machine but there is still no solution to decrease the rate of seeding damaged and increase the rate of weed eliminated when eliminate the intra-row weed. So it is significant to design and study the intra-row weed control equipment.(1) Based on the difference of root between weed and crop, and accorded to the research status of mechanical weed control technology. Analysis the principle of weeding by quadrilateral mesh, make sure the main parameters and the structure of the weeding equipment.(2) Apply the technology of virtual assembly and simulation with NX8.0, modeling the parts, assembling them into a whole and checking the assembly clearance, simulating the model. The result is consistent with the theoretical analysis, indicates the structure is designed rational and could be assembled smoothly.(3) Finite element analysis of the intra-row weeding equipment suspension bracket with the software of ANSYS Workbench. Analysis the total displacement and equivalent stress of the suspension bracket after defining material properties, meshing, adding the actual constraints and loads. The simulation results indicate that the suspension bracket meet the design requirements.(4) Based on the intra-row weeding equipment,central composite design is applied to study the effect of the number of tine on each output shaft, the distance between tines that on the one output shaft, the rotating speed of the drive plate and the forward speed of weeding. With Design-Expert8.0.5b to analysis the impact of each factor on the rate of seeding damaged and the rate of weeding, optimize parameter for each factor. This lay the foundation of the design and experiment of the intra-row weeding equipment.(5) The field trials were done on the soybean field in Sunwu County Heihe City, and tested the optimization results. It indicated that the intra-row weeding equipment designed reasonable and worked smoothly. When the number of tines 6, the distance between tines 40 mm, the rotation speed of the device 190 r/min, the forward speed 2.3 m/s, the rate of seeding damaged is 3.1% and the rate of weeding is 84%. This result of intra-row weeding equipment make a contribution to the research of intra-row weeding up machine in future for it provides technical application reference.