Khankelov T.K., Politaeva N.A., Atabaev G‘.G‘., Choriev A.Sh.
Tashkent State Transport University, Uzbekistan Peter the Great St. Petersburg Polytechnic University, Russia

Abstract: The article is devoted to finding the optimal combination of parameters of spherical and “landfill” dumps intended for the SHANTUI SD 32 bulldozer. Mathematical modeling of the bulldozer’s working process when moving low-density materials was adopted as a research method; the technical performance of the bulldozer was selected, providing a reliable assessment of the results of the parametric synthesis of dumps.To develop analytical relationships for the technical productivity of a bulldozer, the process of prism formation is divided into three discrete phases and the dependence of the technical productivity of a bulldozer for each phase is determined, taking into account losses from the drawing prism. The optimal dimensions of a box blade for equipping the SHANTUI SD32 bulldozer are: working width up to 3730 mm, radius of curvature up to 1700 mm, cutting edge width up to 460 mm, canopy width up to 140 mm, opening length up to 860 mm. The optimal dimensions of the “landfill” blade for equipping the SHANTUI SD32 bulldozer are: working width up to 3900 mm, radius of curvature up to 460 mm, cutting edge width up to 124 mm, canopy width up to 610 mm.

Key words: drawing prism, phase, loss, technical performance, box dump, “landfill” dump.

Introduction: Bulldozers are widely used in construction. Currently, their numbers are nearly equal to those of excavators. Bulldozers account for approximately 35-40% of all earthmoving work in construction. They are used in road construction, land reclamation, irrigation projects, and mining quarries. Bulldozers perform grading work, construct highway and railway embankments using side borrow pits, transport soil over distances up to 100 meters, dig canals and foundation pits, backfill trenches and holes, clear roads and construction sites of snow, fell trees and uproot stumps. They are also used as pusher vehicles when working with scrapers [1].
    It is known that certain materials (snow, wood chips, coal, etc.) are in some cases most efficiently moved by bulldozers. However, the capacity of standard blades designed for soil handling does not allow full utilization of the machine's traction and power in such cases. For these situations, high-capacity bulldozer blades, referred to here as specialized blades, have been developed. Within the scope of this study, the term "specialized blades" refers to high-capacity bulldozer blades for which large-scale earthmoving is not the sole, primary, or preferred application.
    These include [2]: - **Spherical blades** – for moving lightweight materials, - **Box blades** – for handling lightweight, loose, liquefied, and coarse-fragment materials, - **Landfill blades** – for moving municipal waste. This study focuses on determining the optimal combination of parameters for such blades on the **SHANTUI SD32 bulldozer**. The research method employed is **mathematical modeling of the bulldozer's working process**, with **technical productivity** serving as the criterion for evaluating blade parameters, ensuring a reliable assessment of parametric blade synthesis results [3].