Modelagem e construção de um dispositivo para auxiliar o sistema de corte de palhada de semeadora-adubadora

Abstract

The no-till system success involves the selection and efficiency of componentes from the seeder-fertilizer machine. In this case, an efficient straw cutting system is needed in no-till systems, helping the suction and placement of seeds in the soil. Thus, the goal of the work was to model a device that assists the straw cutting process in a seederfertilizer machine, as well as the construction of a prototype with faithful measurements and features to the model obtained in a drawing tool in a computer - CAD. The work was developed in the Machines Projects Lab in the College of Agricultural Science from the Federal University of Grande Dourados, the adjustments were performed in the Mechanical Constructions Lab at the Agricultural Science Experimental Farm (FAECAUFGD), located in Dourados-MS. With the construction of the prototype finished, it was put to be tested, on functioning tests, evaluating the device’s performance in the soil beans sowing under different compaction levels, germination of seeds in the prototype sowing line in comparison to sowing lines without the prototype. The computational modeling in CAD tool allowed a valid conception, because as all the seeder’s original system’s dimensions were the basis of the project , the dimensioned and built parts were able to adjust in the cutting disc having no interferences, which allow us to claim that a modeling using a 3-D software tool makes possible the visualization of a project and it’s features even before it’s built. The use of a tension analysis made possible to outline the clamp rupture projected after modeling and simulating the part that was used as a jamb, redistributing the suffered tension not concentrating it’s efforts in the part’s fragile point. The projected device complied with the goal to increase it’s cutting efficiency tested on the compacted soil and covered with corn straw, where the results of seedling emergence were higher in the sowing line where the device was installed, showing it’s validity in getting better the sowing quality.