RATIONALE FOR THE CHOOSING OF DISC COULTER DIFFUSER MATERIAL

Abstract

One of the most significant problems that arise during the process of sowing grain crops, along with the depth of their incorporation, is the uniform placement of grains in the sown field. A double-disk coulter was developed that allows strip sowing, which consists of a main body, a pair of discs, with a seed scatterer installed between them. The paper describes a technique that allows you to choose the material for manufacturing the diffuser of the disc coulter of a grain seeder and determine the main coefficients using high-speed shooting. The course of a number of theoretical studies and a one-factor experiment is presented, which determined the dependence of the flight speed of the grain after impact on the diffuser on the value of the elastic modulus of the selected material. The results of theoretical and practical studies have been obtained to confirm the previously put forward hypothesis that the post-shock seed flight speed affects their uniform distribution over the sown strip of the interdisk space. For the experiments, two materials most common in industry were determined: aluminum-manganese alloy 3004 (GOST 4784-97) and polyethylene terephthalate (GOST 32686-2014). As a result, it was found that it is more expedient to make a key diffuser from an aluminum-manganese alloy, with an elastic modulus E = 0.7? 10⁵ MPa, which reduces the post-impact seed flight speed from 3.7 m/s to 0, 65 m/s. Conducted and processed high-speed shooting revealed that the movement of the seed flow does not differ significantly from the movement of one grain, its movement is subject to a similar law.