INVESTIGATION OF THE INFLUENCE OF AUGER DRUM PARAMETERS OF FOREST FIRE SOIL-THROWING MACHINE WITH THE FUNCTION OF FIRE-BREAK MAKER ON THE QUALITY OF SOIL FLOW CLEANING FROM THE GROUND COVER

Abstract

Currently, the most common way to prevent and extinguish forest ground fires is laying of mineralized strips and ditches using forest plows, milling strip-laying machines and soil throwers. However, fire-break making soil throwers are not equipped with devices for removing the ground cover with combustible plant residues from the soil flow supplied to the fire zone when extinguishing forest ground fires, which significantly reduces the efficiency of the machine. Augers with a hydraulic drive are promising, which allow removing the ground cover, however, additional studies of kinematic and dynamic parameters are needed. The purpose of this work is to improve the quality of cleaning the flow of soil from the ground cover supplied to the edge of the fire by a forest fire stripper by substantiating the parameters of the auger working bodies. The analysis of literary sources showed that it is advisable to use modern mathematical models of the interaction between an object and the environment, based on the particle dynamics method, in the development of a forest fire soil-throwing machine. A new design of a forest fire soil thrower with auger working bodies, which are designed to remove the ground cover, is presented. A simulation model of the working process of auger working bodies using the particle dynamics method was compiled. A basic computer experiment was carried out to clean the soil flow from the forest litter. It has been established that pressure in the hydraulic motor decreases approximately exponentially, and the rotational speed of the working body also increases approximately exponentially up to 4 rpm during the acceleration of the working body. The interaction of the working body with the stump led to the appearance of a negative braking torque of up to 4.5 kNm. As a result, the rotational speed of the drum decreased from 4 rpm to almost zero. With a decrease in the rotational speed, the pressure in the hydraulic motor of the drive of the working body increased to 12.5 MPa. The auger working body provides approximately the same cleaning efficiency of the soil flow with a ground cover thickness of up to 20 cm, while the cleaning completeness is at least 0.86, and the power consumption is not more than 8 kW