<abstract> <p>This article presents the results of a study of the sieve mill of a grain cleaning machine with a drive based on a linear asynchronous motor instead of a classic mechanical drive. The purpose of this work is to describe the structural and technological parameters of a sieve mill with a linear asynchronous drive to implement a mathematical model of the technological process of a grain cleaning machine work. A kinematic study of the flat hinged mechanism of the sieve mill of a grain cleaning machine was carried out, for which all geometric dimensions are known and the laws of motion of the leading link - the electric drive of the sieve mill based on a linear asynchronous motor are determined. As a result, the following were determined: kinematic modes <italic>k</italic><sub><italic>P</italic></sub> > <italic>k</italic><sub><italic>B</italic></sub> > <italic>k</italic><sub><italic>H</italic></sub> of sieve mill vibrations under various technological conditions; laws of motion of all parts of the mechanism of the sieve mill, movement, speed (0.34... 0.36 m/s) and acceleration (5.8... 6.9 m/s<sup>2</sup>) of the driven links; a mathematical model of the kinematic scheme of a sieve mill of a grain cleaning machine with a drive from a linear induction motor has been developed. The use of a linear induction motor compared to existing (classical) drive designs as a drive of a sieve mill in a grain-cleaning machine significantly reduces the metal consumption of the structure (drive shafts, transmission mechanisms, connecting rods, bearings are excluded from the structure), and energy consumption is also reduced due to pulse drive operation; makes it possible in a wide range of technological parameters regulation for various crops, including various physical and mechanical parameters of the crop being cleaned.</p> </abstract>
Abstract-The authors of the paper present the results of theoretical research of the pulsed operating mode of linear electric sieve mill of grain cleaning machine MVR-2 (SU -0.1). It is shown that when using a linear electric drive in the grain cleaning machine in a pulsed mode, the productivity is increased by 20%.
Grain production economic efficiency mostly depends on the use of energy-efficient, resource-saving technological equipment that can ensure a high-quality technological process. In this regard, this paper considers ways to improve the vibrating drives of vibration-centrifugal grain separators which have a complex design and involve high operating expenses (the life of vibrator bushing does not exceed 180±20 hours). A linear induction motor was used in this study as a vibrating drive, which directly forwarded working body movement without using any movement converters. This type of motor together with elastic elements helps to implement energy-efficient electric vibrating motion with adjustable vibration parameters. The mathematical model of the vibro-centrifugal grain separator with a linear motor was developed. The model was implemented in the environment of MatLab (Simulink) object-visual modelling, which showed the correlations of the working body vibration parameters with the drive kinematic parameters. The suitability of the model was proved experimentally. The difference between the experimental data and the data obtained by mathematical modelling does not exceed 6%. The comparative assessment results showed that the maintenance intervals increased by 37.8% in the project version compared to the basic version. The proposed technical solution made it possible to obtain the vibrational motion of the centrifuge working body using the linear induction electric motor without the need for a control unit to connect and disconnect it periodically from the mains. This can reduce the starting currents in the inductor windings and increase the reliability of the installation. Thanks to the use of the linear induction electric motor in the vibrating drive of the vibro-centrifugal separators vibrating drive, it is also possible to save metal.
One of the options for improving the efficiency of the machine and tractor unit in the field is the use of course indicators, thrusters, hydraulic autopilots and other equipment. However, these devices do not exclude environmental pollution by exhaust gases and the presence of significant operating costs for fuel and lubricants. In this regard, the paper proposes an electric-powered unmanned device (EPUD), which can perform the tasks with high accuracy (deviations from the set course average 16 cm) due to autonomous movement on GPS/GLONASS satellite radio navigation signals on agricultural lands. For the effective application of liquid agents to agricultural crops, a device is proposed that provides an electric charge of the introduced fine aerosol, which is installed on the EPUD and reduces the electrical energy consumed by 23.5% compared to existing analogues. All this, combined, will reduce operating costs up to 10%, as well as improve the environmental performance of crop spraying. Based on the conducted studies of the EPUD, its design was developed and a prototype with a software and hardware part was created. A device for the electric charge of the introduced aerosol, which makes it possible to increase the uniformity of the aerosol application on the plant, has been developed and investigated. The effectiveness of the developed technical solution had been proved by laboratory and field tests.
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