UDC 631.331
DOI 10.36461/NP.2025.75.3.025

THEORETICAL JUSTIFICATION OF SOME DESIGN PARAMETERS OF A COMBINED COULTER
A.N. Kalabushev, Candidate of Engineering Sciences,
V.V. Shumaev, Candidate of Engineering Sciences, Associate Professor
Penza State Agrarian University, Russia, tel. (8-8412) 62-85-79,
e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it., This email address is being protected from spambots. You need JavaScript enabled to view it.

The process of sowing seeds of grain crops, as well as small-seeded crops, is one of the most important technological processes. Carrying out sowing in compliance with agrotechnical requirements has a significant impact on crop yields. To obtain good germination and, as a result, a high yield, it is extremely important to ensure uniform distribution of seeds across the sowing area and depth with optimal soil compaction [1, 2].
The aim of the research was to theoretically substantiate some of the design parameters of the combined coulter, in particular the minimum radius of the rib of the combined coulter, the minimum radius of the disc of the combined coulter, the width of the seedbed compactor of the combined coulter, as well as parameters such as the depth and density of the furrow sole after the passage of the combined coulter with a seedbed compactor.
The theoretical research was based on the classical laws of engineering mechanics, simulation modeling, etc.
As a result of the conducted research, patterns have been obtained on the basis of which it is possible to obtain the main design parameters of the coulter and the technological process: the depth of the furrow h≤r_к∙(1-cos⁡〖δ)〗, the minimum radius of the coulter rib r_(к min) = r_п∙〖ctg〗^2 ((φ_1+φ_2)/2)+s , the minimum radius of the coulter disc r_(д min) = r_(к min)+s, the minimum seeding depth h_φ1min=2r_п∙〖ctg〗^2 ((φ_1+φ_2)/2)∙〖sin〗^2 φ, the width of the coulter disc rib b_0=Q_z/(µ^3 qD^2 ), the width of the seedbed compactor с>b>l_max, the density of the furrow sole p=1,34∙10^3,,кг/м^3.
Scientific novelty is confirmed by the patent for utility model of the Russian Federation No. 237416 dated September 23, 2025 “Combined coulter”.
Having conducted theoretical studies of some design parameters of the combined coulter, it can be concluded that one of the options for improving the quality of sowing is to use combined coulters equipped with ribs and seedbed compactors [3, 4].
Keywords: coulter, rib, soil, compactor, disc.

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