Abstract
In this paper, it is proposed to use a self-propelled pneumatic mini-seeder with replaceable mechanical sowing devices designed and manufactured using computer technologies, advanced software and threedimensional printing for seeds selection. As a result of the research, hightech operating devices for a grain-drill feed with screw and disk-pin continuous seed metering are designed and manufactured. Grain-drill feeds allow sowing of free-flowing and non-free-flowing seeds, when used as seed meters on self-propelled pneumatic mini-seeders for selection sowing of grass seeds. Analysis of laboratory results of and field studies of the proposed grain-drill feeds allowed to determine the qualitative indicators of their performance: at a disk rotation speed of up to 15 rpm a linear dependence of the seed supply on the rotation frequency is provided; in the field studies, the instability of bluegrass seeding did not exceed 8%. The highest performance of the screw is obtained at the angle of choke inclination of 30...35 degrees with the seeding instability indicator of 2.5...3.5%. The developed grain-drill feed will significantly reduce the range of seeders and expand the set of sown seeds of various agricultural plants with one brand of a grain-drill feed.
Highlights
The basis of food security of the state and provision of the population with quality food is development of the agricultural sector of the economy
During the analytical study of seed material movement by the pin disc, it was found that the average speed of seeds in the layer transported to the sub-shield space in the discharge window of the hopper is below rotation speed of the sowing disc by the value specified in the square brackets, which in turn depends on design parameters of the grain-drill feed, physical and mechanical properties of seeds
By increasing in the angle of flap inclination to over 33...35 degrees, there is a decrease in screw productivity, which is explained by a decrease in filling of a screw with seeds, due to formation at the bottom of the casing of a the seeds volume with an angle of natural slope corresponding to the seeds of mogar
Summary
The basis of food security of the state and provision of the population with quality food is development of the agricultural sector of the economy. Significant reduction of the seeders range and expansion of the set of seeds which can be sown with one seeder can be obtained by using a universal self-propelled small-sized base consisting of a pneumatic sowing system with replaceable mechanical sowing devices adapted to conditions of selection [1,2,3] In this regard, and taking into account small size of seeders for small land plots, the use of computer technology, advanced software and three-dimensional printing will allow to produce high-tech products of any geometric shape, which can be used both for prototypes manufacturing and as finished products [4,5,6]
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