Justification and determination the main parameters of spiral plate-type of work part
Justification and analytical derivation of the equations to determine the basic parameters (including forms) of rotary (circular, screw, a helical-type and etc.) working parts of tillers were the subject of investigations by several authors. Also from literature sources, we can say that the working parts of passive rotary actuator (jet - the drive from the soil) for the crumbling of the soil and associated operations will require further theoretical and experimental studies. Therefore, we investigated spiral plate-type working part with corrugated (wavy) work surface and a cutting edge with teeth, accomplished at the site of the logarithmic spiral. Thus, the wavy form of the working surface has an influence on the cutting edge. In consequence of that, the teeth of the cutting edge radially disposed on a path, extending along a helical line and rejected in two directions (right and left turn). Based on the foregoing, we justified and prepared relations to define the basic parameters of the working surface of the teeth and the cutting edge of the working part spiral plate-type elements: the diameter (D), the number of teeth (Z3), the depth of cut (C'), the distance between adjacent teeth - tooth pitch (S3 ), length of the front cutting edge of the tooth (ℓ 3), the length of back edge of the tooth (ℓ t), lead of a screw (tmax), the width of the operating element (H), width of a tooth at its apex (B3) and the distance from the apex of the tooth to its leading edge (L3 ). The analytical dependence can justify the choice of the main design parameters of the operating element and design the toothed spiral plate-type working part, which is reduced to the calculation of the basic dimensions and meaningful implementation.