Energy required to cut the soil with No.4 circumferential knives of the large rotor of the straight-through rotary ripper

Introduction. To solve the problem of the fast and high-quality road construction, when economic facilities and settlements are located at a considerable distance from each other, cannot be solved without the use of a complex of continuous units. The continuous ditch forming unit and the tunneling unit contain straight-through rotary rippers. Insufficient theoretical studies in this area do not enable to calculate the interaction of the elements of a direct-flow rotary ripper with the soil. Therefore, there is a need for theoretical studies to determine the energy parameters of the large rotor, in particular, that which is necessary for cutting the soil with the No.4 circumferential knives of the large rotor.
The research method. The methods for calculating the required energy inputs: to separate the reservoir from the soil mass; separation of the reservoir into fragments; creating a gap in the soil mass; deformation of a part of the soil mass; overcoming the friction of the ground on the edge of the blade; overcoming the soil pressure on the front surface; movement of the soil by the front surface; overcoming the friction of the ground on the front surface have been developed.
Results. On the basis of the developed methods, the parameter calculations were made. From the plane models and the spatial model of the forces of interaction with the soil of the circumferential knives No.4 of the large rotor, resultant forces, their components, normal forces were revealed. The force of friction of the soil on the edge of the blade and the front surface of No4 circumferential knives was calculated. The volumetric energy required for cutting with No.4 circumferential knives when mining one cubic meter of soil with a straight-through rotary ripper is calculated.
Conclusion. The energy required to drive the circumferential knife includes separating the seam from the soil mass; separation of the reservoir into fragments; creating a gap in the soil mass; deformation of a part of the soil mass; overcoming the friction of the ground on the edge of the blade; overcoming the soil pressure on the front surface; movement of the soil by the front surface; overcoming the friction of the ground on the front surface. As a result of the calculations, the total energy required for cutting with No.4 circumferential knives, when mining one cubic meter of soil with a straight-through rotary ripper, was 9110 joules.

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