Mathematical modeling of a self-propelled scraper at the beginning of soil set

The process of filling of scoop of dragshovel consists of a few operations which periodically repeat oneself in the working loop. Each of these stages is accompanied the different moving of dragshovel and his separate knots, conditioned actions of external forces, at cutting and load of soil in a scoop, that needs separate consideration of the tense state of dragshovel equipment in a few calculation positions. The analysis of the modes of ladening of metallokonstrukcii of dragshovel during implementation of basic operations of digging allows to define the rational modes of operations of machine. For the decision of the put tasks the calculation chart of self-propelled dragshovel was developed in the process of zaglubleniya of knife in soil, on the basis of which taking into account the grounded limitations and scope terms, a twomass mathematical model, having degrees of freedom in horizontal and vertical directions, is created. With the purpose of simplification of mathematical model the angular vibrations of tractor and dragshovel were not taken into account, in connection with their small influence on the operating loadings at zaglublenii of scoop. Realization of mathematical model allowed to get the charts of dynamic change of horizontal and vertical force, operating in the hinges of hauling frame. Swaying character of loadings rotined that maximal values were arrived at almost for the identical interval of time in the first semiperiod, and horizontal and vertical efforts increase with the increase of intensity of resistance digging. The results of researches rotined that forces operating in the front hinge of hauling frame grow with the increase of intensity of resistance digging, arriving at the maximal values of 195 and 78 kN. Horizontal efforts to a great extent exceed vertical and increased with growth of intensity of resistance digging. The rate of increase of maximums of horizontal force can be considered even, because at megascopic intensities from 150 to 250 kN/m, most values grow approximately on 32 %, that enables to draw conclusion about expedience of work with the less rates of movement of dragshovel, taking into account loading of metallokonstrukcii. The rate of growth of maximums of vertical force can be considered even, approximately on 7 %, with the increase of rate of climb of knife of dragshovel, that far fewer as compared to growth of efforts, operating in horizontal direction. Therefore diminishing of speed of zaglubleniya will not result in the substantial diminishing of loading on the hauling frame of dragshovel.