Minor rotor tines and knives soil interaction. Total power calculation for minor rotor drive

Abstract

Introduction. The problem of fast and high-quality road construction, when economic facilities and settlements are spatially separated, located at a considerable distance from each other, cannot be solved without the use of a complex of continuous units. An important element of the continuous unit forming the ditch and the unit for tunneling is the direct-flow rotary ripper. Current theoretical studies are not sufficient to calculate the interaction with the soil of the elements of a direct-flow rotary ripper. The lack of theoretical justification for the parameters of direct-flow rotary rippers hinders their use. Therefore, there is a need for theoretical research to identify the geometric, kinematic, dynamic and energy parameters of structural elements.The method of research. Methods for calculating the required power to drive the teeth, to separate the seam from the soil mass with knives and divide it into fragments, to overcome the inertia force of the incoming soil on two small rotor knives, to accelerate the soil towards the large rotor, to move the soil towards the large rotor, to overcome the friction force of the soil on the front surface of the knives have been developed. The total power required to drive the small rotor corresponds to the sum of the powers: for the introduction of a cone with a spiral knife into the ground, for the drive of the teeth and for the drive of the knives.Results. On the basis of the developed methods, the parameters were calculated. From the flat and spatial model of the forces of interaction with the ground of the elements of the small rotor, their resultant, their components, and normal forces are revealed. The friction force of the soil on the front surface of the knife is calculated. The total power for the drive of the small rotor and the volumetric energy for the introduction of the small rotor into the ground are calculated.Conclusion. The energy costs for driving small rotor knives include: energy for separating the reservoir and dividing it into fragments, energy for overcoming the pressure of the soil on the front surface of the knife, energy for accelerating the soil, energy for moving the soil, energy for overcoming the friction force of the soil on the front surfaces of the knives. The total energy cost of the small rotor drive includes the energy required to introduce the spiral knife cone, teeth and knives of the small rotor into the ground. As a result of the calculations, the power to drive the teeth of the small rotor is 735 W, the total power required to drive the small rotor is 2.2 kW. The volumetric energy for the introduction of a small rotor into the ground is 33.1 kJ / cubic meter.