Turn height calculation for spiral blade

Introduction. The problem of accelerating and reducing the cost of road construction without reducing their quality can be solved by creating a complex of continuous units. The units, following each other, carry out the whole range of works aimed at the construction of roads. One of the elements of the continuous unit that forms the cuvette is a direct-flow rotary ripper. It was revealed that for excavation near the axis of rotation of the rotor of a direct-flow rotary ripper, a small rotor with a higher angular velocity should be installed, coaxially with a large rotor. The small rotor contains: a small rotor tip with spiral blades, two teeth and two knives. One of the elements of the small rotor is a spiral blade. The interaction with the soil of spiral blades has not been sufficiently studied.
The method of research. The interaction with the ground of the tip of a small rotor with spiral blades is considered. The angles of inclination of the first and second turns of the spiral are determined by the construction of the scan. The following assumptions are made: the ratio of the forces acting on the part of the cone with the spiral to the part of the cone without the spiral is equal to the ratio of the lengths of the cones forming these parts; The spiral blade does not slow down the unit and does not accelerate it, that is, the sum of the forces that counteract the introduction of the cone into the ground balances the forces that introduce the cone into the ground. The sum of the conditional normal reactions of the cone to the impact of the soil is equal to the product of the resistivity of the soil and the surface area of the cone and the coefficient that takes into account the increase in the resistivity of the soil as it is compacted by the cone.
Results. On the basis of the methodology, calculations and constructions were made. The area of the front surface of the turn of the spiral blade is approximately equal to the product of the height of the turn and the length of its midline. By construction, the length of the midline of the turns was revealed. The dependences of the length of the spiral on the height of the turn of the spiral blade are shown in the figures. The limits of the angles of inclination of the base of the first and second turns of the spiral blade are established. The height of the turn blade is determined.
Conclusion. The angles of inclination of the first and second turns of the spiral are determined by constructing the scan. By constructing projections on the transverse-vertical plane, the lengths of the middle lines of the spiral blade spins are determined. Based on the calculations, taking into account wear during operation and distortion of the projection of the spiral on the transverse-vertical plane, the height of the spiral blade is 10 mm.

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