The article presents a development of new machine safety devices, which provide protection of operating elements from overload. Theoretical calculations have been made in order to determine the optimum design, kinematic and dynamic parameters of safety devices. A test bench has been developed and experimental investigations have been conducted in order to determine basic parameters of overload clutches.Keywords: safety devices; overload clutch; design and kinematic parameters; dynamic load; test bench; operating elements of machines. J -equivalent drive moment of inertia; 21 J -equivalent drive half coupling moment rtia; 22 J -equivalent driven half coupling moment of inertia; 3with a screw operating element drive has been developed ( Figure 3). This model is described by the following set of equations:
The article presents the results of theoretical and experimental studies of the process of moving bulk material in the inactive zone between hinged screw sections of a flexible screw conveyor. The influence of the gap between the edges of adjacent screw sections and the magnitude of their circular displacement on the process of continuous transportation of bulk material is presented. The results of theoretical and experimental studies are compared. This will allow choosing the optimal design, kinematic and technological parameters of the developed sectional screw working body when transporting bulk agricultural materials along curved paths, both in horizontal and inclined directions, as well as along curved paths.
The paper covers the results of the theoretical and experimental investigation of the developed sectional operating element of a flexible screw conveyer designed for transporting bulk agricultural materials. In order to determine the correlation between the design parameters of the hinged screw sections and the minimum permissible radius of curvature of a processing line, the analytical dependences have been deduced. The results of the experimental studies aimed at determining the efficiency of a screw conveyer and the level of the grain material damage depending on the change in design, kinematic and technological parameters of an operating element are presented.
A mathematical model of root crops after-cleaning and their movement pattern in a technological run for loading into means of transportation has been presented. The impact of both controlled and uncontrolled factors on the efficient continuous transportation of root crops has been determined on the basis of the above-mentioned model. The use of the suggested mathematical model will enable to narrow the search of the most efficient design, kinematic and dynamic parameters in conducting some experimental research on efficient operation of after-cleaning systems of harvesters with their possible adjustment according to the natural and climatic conditions of harvesting. Keywords: mathematical model of root crops after-cleaning, root crops movement pattern, transportingseparating system, design, kinematic and dynamic parameters of tools.Серия Математика . № 4(96)/2019
The article presents the developed design of the pneumatic-screw conveyor, as well as its experimental installation. The method of conducting experimental researches to determine force indicators at movement of different types of loose materials under the influence of air pressure and their volume of various types of bulk materials. Based on the conducted experimental studies, the response surfaces and two-dimensional cross-sections of the pneumatic-screw conveyor productivity when the material passes from the whole area in the hopper transition zone to the screw feeder, its rotation frequency and the working air pressure in the process line have been constructed.
The results of an elastic sectional screw operating tool development and its production technique are presented in the article under consideration. The operating tool has been made to fix the elastic sections, providing the transportation of bulk materials of agricultural production, in order to ensure their minimal damage and the process minimal power capacity. The article presents constructed regression dependencies and response surfaces for the effects of the design, kinematic and technological parameters of a sectional screw operating tool on power consumption and the damage rate of grain material in the process of its transportation. As the result of the conducted experimental research, authors came to a conclusion that the arrangement of an elastic auger without a gap between its peripheral part and the inner surface of the guiding tube significantly reduces vibrations in the process of conveying bulk material.
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