Vol 76, No 12 (2009)

Технологическая потребность АПК Российской Федерации в с.-х. колесных тракторах кл. 0,6 составляет 44,9 тыс. эт. ед., однако существующий платежеспособный спрос на рынке не обеспечивает не только увеличения парка, но и обновления уже существующего.

The design and principle of work of two-phase feeder for the loader of continuous action for loading potatoes are brought. Optimum values regime and design data of working organs of a feeder and their influence on the twisting moment and drive capacity are installed. The analysis of two-phase feeder work is presented at a variation of levels of each pair of researched factors.

Is developed procedure and mathematical model of the estimation of interaction of wheel logging tractor with the bundle of wood by dragging taking into account nonholonomic constraints at the contact points of tires and crown of the skidding bundle of wood with the bearing surface, that make it possible to reveal the important special features of dynamic processes proceeding in this case and to reduce the degree of the divergence of the results of theoretical and experimental studies.

The modification of the stressedly-deformed state and the density of viscoelastic sandy-loam soil as a result of the sequential passages of the wheel tractor with the different speeds on the soil were investigated. Viscoelastic properties of the soil are described with the first order differential equation connecting the compressive stress, the speed of the change of the compressing stress and relative deformation of the compression in the vertical direction. A method of calculation of the deforming indices and the compacting of the soil because of the creep after tractor has stopped was offered. In the computing experiments, the calculated data which characterize the influence of the row of factors on the viscoelastic properties of the soil and the compressing action of the tractor on the soil was obtained.

The article considers one of the approaches to the automation of grain harvester adjustment system based on the digital method.

The paper presents a mathematical method for calculation of the optimal slope of the directing disk to the rotation axis of roller-and-disk sorting tool. Analysis of the obtained results shows that the choice of rational parameters and operation modes of the above tool improves the grading accuracy and lowers the tuber damage thus raising efficiency of potato grading machines.

In this article the substantiation of the indices allowing to evaluate the combiner's professional safety and results of combines «Yenissey-1200M» and «Don-1500» security level determination are presented.

Results of work on creation of the motorless thermal stand, which allows to determine experimentally the thermal stability of pistons at a cyclic transient thermal load, are stated. The way of installation of thermocouples and the results of temperature measurement of the piston at the created stand are described.

Due to absence of continuous action loaders on farms of МПК-Ф-1 type, widely used cycle action loaders are offered to apply defecation residues. To increase efficiency of these loaders the scheme of working process in the field is improved. A new method of technology elements rational parameters calculation is given.