Сельскохозяйственные машины и технологии (Apr 2016)
ANALYSIS OF TRACTIVE RESISTANCE OF GENERAL PLOW BODY ELEMENTS
Abstract
One of the directions of decrease in power consumption of soil cultivation is change of a form and parameters of elements of a plow body like a plough share and a moldboard. Known mathematical expressions for determination of traction resistance of plows do not allow to consider various degree of loading of different parts of moldboard. The offered technique of definition of a horizontal component of traction resistance of a moldboard considers this difference in loading of a plow body surface. The component of surface resistance was determined due to summation of resistances of elementary horizontal components of a moldboard, with use of crumbling curves of a longitudinally vertical projection of the plow body. These curves are formed owing to horizontal transfer of points of intersection of secants of tcutting planes parallel to a furrow wall. If the deformator is completely digged in the soil, but there is no its turn and movement, then an expression for determination of work intensity of the active working element at penetration to the soil allows to calculate traction effort of an elementary horizontal component of moldboard resistance. The received expression can be used at approximation of curves of a longitudinally vertical projection of the plow body where the breast and median part of a moldboard are most loaded. Degree of loading of an elementary horizontal component of a moldboard is formed by the normal tension value which is comparable to deformation coefficient. The resistance component for soil layer ejecting considers the plowing depth, furrow width, speed of the plowing unit, density of the deformable soil, average value of a tilt angle of generators of a moldboard surface to a furrow wall. If moisture content in loamy soil is about 21 percent, plowing depth equals 0.20 m then the traction resistance of a 0.35 m wide moldboard will amount 1035 N.
