STATIC INTERACTION BETWEEN THE TINES OF A FORK AND A GARLIC CLOVE
DOI:
https://doi.org/10.32718/agroengineering2025.29.22-26Keywords:
garlic clove, fork tines, interaction, pinching force, spring stiffnessAbstract
The proposed scientific study significantly contributes to the ongoing research aimed at developing mechanized techniques for the individual planting of garlic cloves. This work is built upon analytical research focused on determining the volume, mass, and coordinates of the center of gravity of garlic cloves, which are formed on the central core of the garlic head. This is considered within a Cartesian coordinate system as part of a sphere of the corresponding radius. The study examines the interactions within the "drum - garlic clove - fork" system and explores how the roller of the fork rod interacts with the various profile surfaces of the planting device guides in the proposed planter design.
The article presents findings on the interaction between the forks of the planting device, which is designed for forced, individually oriented planting of garlic cloves with the bottom facing down and the sprout facing up. These forks are lined on the inside with an elastic material that interacts with the garlic clove. An analytical method is employed to address the contact problem arising from the interaction of two anisotropic bodies of differing densities, each characterized by its respective Young's modulus and Poisson's ratio.
A calculation scheme is provided, illustrating the contact area between a garlic clove and the elastic material of the fork tines in the shape of an ellipse. The parameters of this ellipse's semi-axes depend on the size and shape of various garlic varieties. The study also accounts for the fact that the principal radii of curvature of the garlic clove's surface and the elastic element of the fork tines are known, and that the main contact planes of the surfaces involved coincide.
The conducted theoretical analyses have resulted in analytical relationships that enable the determination of the maximum pinching force exerted on a garlic clove between the tines of the fork. This is contingent on ensuring that the resulting stresses remain below permissible limits. Additionally, the research identifies the necessary stiffness of the spring required to securely hold the garlic clove between the fork tines during in-machine transportation and direct insertion into pre-formed grooves.
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