Theoretical research into operation of rotary potato harvester
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Kuupäev
2021
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Kirjastaja
Abstrakt
The topic of the paper is the determination and justification of the rational design and
kinematic parameters of clod breaking tools in rotary potato harvesters with the aim of improving
their separating efficiency. A new mathematical model has been developed for the motion of a
soil particle on the working surfaces of the cone-shaped and cylindrical vanes in the rotary tool
of the new design developed by the authors. Differential equations have been generated for the
motion of a soil clod as a material particle from the moment of its arrival to the surface of the
vane until the moment of its departure from the said surface. As a result of the completed
investigations, relations have been established between the time of contact and absolute
displacement of the soil particle and the velocity of its departure from the rotor vane surface, on
the one hand, and the kinematic and design parameters of the rotor, on the other hand. For
example, when the machine translation velocity increases, the absolute displacement of the soil
particle within the interval from the time zero to the moment of its departure from the vane surface
increases from 0.59 m to 0.65 m, the velocity of soil particle departure from the vane surface -
from 1.61 m s–1 to 1.81 m s–1. The highest values of the absolute displacement of the soil particle
and the velocity of its departure from the vane surface are achieved at a machine translation
velocity of 2.0 m s–1. The time of the contact between the material particle and the vane surface
decreases with the rise of the translation velocity. When the rotor rotation frequency varies within
the range from 20 min–1 to 100 min–1, the absolute velocity, with which the soil particle leaves
the vane surface, rises to 4 m s–1. The duration of the contact between the material particle and
the vane reaches its maximum value of 0.33 s, when the rotor rotation frequency varies within
the range of 30–40 min–1.
Kirjeldus
Received: May 25th, 2021 ; Accepted: June 22nd, 2021 ; Published: June 28th, 2021 ; Correspondence: jyri.olt@emu.ee
Märksõnad
clod-crushing, harvesting machine, loamy soil, potato, soil separation, vertical rotor, articles