Theoretical study of uniform motion of the harrowing section for steam treatment

Abstract

Annotation Purpose. It ensures a stable position of the trailed harrowing section for fallow treatment in the longitudinal-vertical plane by choosing its rational design parameters. Methods. Analytical using the fundamental provisions of theoretical mechanics and theory of agricultural machinery. Results. One of the tasks of fallow treatment in the arid conditions of the south of Ukraine is preserving soil moisture. The only significant problem is to ensure the stability of the position of the tillage implement in the longitudinal-vertical plane. To solve this problem, the agro-technical background of the fallow field should be processed to a sufficiently small depth, not exceeding 5–6 cm. Theoretical research has shown that there is no need to equip the harrowing section with shortened teeth of the second, third and fourth rows, as the impact of this design solution on the equilibrium position of the tool in the longitudinal-vertical plane is insignificant, and the complexity of its design is significant. When we increase the angle of installation to the horizon of plane-cutting elements φ, the angle of friction of the soil φт and the height of the tooth h, the angle of inclination of the leashes of the harrowing link to the horizon α should also be greater. Conclusions. The most significant influence on the harrowing link’s angle installation of the leashes α has the value of the distance between the rows of its teeth b. The rational values of this parameter are in the range of 0.27–0.29 m, which corresponds to the change of the angle α within 6–11°. In the absence of flat-cutting elements in the working bodies of the first row of the harrowing section, all values of the design parameters h, d, and b correspond to smaller values of the angle α. From the standpoint of reducing the size of this tillage tool, the second option is more acceptable. Moreover, it allows considering the influence of the installation angle of the segments φ on other parameters of the harrow. Keywords: fallow field, harrow, harrow tooth, stability.