ТЕОРЕТИЧЕСКОЕ ИССЛЕДОВАНИЕ КИНЕМАТИЧЕСКИХ И ДИНАМИЧЕСКИХ ХАРАКТЕРИСТИК ШНЕКОВОГО РАБОЧЕГО ОРГАНА ЛЕСОПОЖАРНОЙ ГРУНТОМЕТАТЕЛЬНОЙ МАШИНЫ

Abstract

The paper presents the results of studies of the working processes of screw working bodies in various industries. Studies of the technological parameters of screw working bodies during the removal of the ground cover with combustible plant residues have been insufficiently carried out. A new design of a forest fire machine is proposed, including screw working bodies for removing the ground cover with combustible plant residues, cut-out discs, for the formation of a soil shaft in front of the rotor-thrower, with an adjustable guide casing with the ability to change the directional flow of soil. Working bodies of the forest fire soil-throwing machine are described by a system of differential equations of the translational, rotational movements of the auger working body and the equation of the flow rates of the working fluid. The Cauchy problem is considered on the interval t∈ (t_0; t_end). Original system is reduced to a system of recurrence relations due to its nonlinearity, replacing the derivatives of the desired functions with their finite analogs. This system is unresolved with respect to the senior member. One can apply the method of splitting the system into systems in subspaces of decreasing dimensions and solve the system in these subspaces due to the Fredholm property of the operator coefficient in front of the leading term. The analytical solution of the mathematical model for removing the ground cover by auger working bodies of a forest fire soil-throwing machine when laying fire strips and extinguishing grassland forest fires makes it possible to determine the kinematic and dynamic parameters of the auger working bodies using the final formulas. Simulation modeling of the screw working process was carried out on a virtual laboratory bench. The dependences of the dynamic characteristics of the auger working bodies when overcoming obstacles have been obtained. It was found that the maximum average value of the torque is observed when overcoming an obstacle with a height of 100 mm and the rotation speed of the working body of 400 rpm is 1468.49 N ∙ m, at which its performance is not impaired.