Development of complex indicators and evaluation of efficiency for dump-type earthmoving and transport machines

Introduction. In modern market conditions, dump-type earth-moving transport machines especially need to analyse the marketing of these machines. Therefore, some acquired earth-moving machines during the development of soils with stony inclusions (typical for the RK) quickly wear out their cutting edges of the knife, then gradually fail the machines themselves, thereby not justifying their cost, i.e. are not operated effectively in practice. The goal is to choose from a variety of types of machines the most effective models of earth-moving and transport machines of the dump type, adapted to the conditions of the ground background of the Republic of Kazakhstan with the help of developed complex evaluative indicators.

Methods and materials. As materials, the well-known 6 specific, generalized parameters and additionally developed by the authors of 20 assessment indicators (specific, generalized, differential and integral) were used to evaluate the competitiveness of the projected new design of the working body of the earth-moving transport machine of the dump type, as well as the operated these machines.

Outcomes. As a result of the analysis of the interaction of the working body of the bulldozer with the developed soil and the study of their parameters, the estimates were developed and formed to assess the effectiveness of the bulldozer. The field tests of the proposed six promising design solutions for a bulldozer with different blades were carried out to compare the structures with each other and evaluated them in quantitative form. According to the calculated estimates, the efficiency of the bulldozer blade was evaluated for six variants of structural executions and graphs of changes in the estimated indicators from experimental data were built on their numerical values, allowing to evaluate the technical and economic efficiency for various designs of bulldozer blades.

Discussion and conclusion. The analysis of the estimated indicators: material consumption G/G_пр and G/P show, that with the improvement of the blade design (cutting off the two lateral upper parts of the blade and adding the two lower side – extension knives), the metal intensity decreases, and the volume of the maximum set of drawing prisms increases, respectively, the productivity of the bulldozer increases; energy intensities, N/П, N/G_пр and G∙N/P² show, that with the improvement of the design of the bulldozer blade, energy performance improves, i.e. the energy consumption spent on the development of a single volume of soil decreases; the specific force per unit width of the R/B knife and the specific power per unit width of the N/B knife are reduced. Generalized power savings and power loads R · N/B² shows that, with the improvement of the blade design, their values almost do not change (the blade of the type design and the blades with equipment - a protruding middle knife and side scarves sharply (jumpingly) increase the volume of the prism drawing.

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