Abstract
Existing technical means for loading silos with grain material do not fully meet the needs of production. The issue related to grain injury remains urgent, which predetermines the need to design a gravitational loader of another principle of operation with the appropriate theoretical justification for the movement of grain material in it. This paper has presented and substantiated the model of the gravitational movement of grain in the peripheral open screw channel with two variable angles of inclination. The model is based on the system of forces in the cylindrical coordinate system, acting on the volume of grain flow in the peripheral screw channel. The grain speed at the end of the braking section of the channel should be as low as possible but not less than the initial flow rate at the beginning of the acceleration section. The model takes into consideration this condition and ensures the optimal passage of grain along any part of the channel. The reported model makes it possible to obtain the speed of grain movement at any time, takes into consideration the height of the bunker hole and the dependence between the angles of inclination of the spirals of acceleration and brake sections. A mathematical dependence is given for these angles that ensures the passage of grain without its discharge and, at the same time, prevents injury to the grain mass due to a controlled decrease in the resulting speed. A separate dependence is provided to find the time at which the grain increases its speed on the acceleration section, reaching the maximum value. Based on the model, a peripheral open screw channel with two angles of inclination of spirals α and β has been proposed. For this channel, the relationships between its key parameters have been established, in particular, values have been substantiated for the recommended angles of 41°…45° for the acceleration section and 39°…35° for the brake section, respectively, as well as the hо/r ratio not less than 0.6...0.7.
Highlights
An important issue related to modern agriculture is the increase in the gross production of high-quality grain
The structures proposed in [21,22,23] reduce grain injury and dynamic bulk compaction but are cumbersome and do not solve the issue of controlled reduction of grain movement speed when loading it into silos
We studied the grain movement speed in an open screw channel with acceleration and braking sections with corresponding variable angles of inclination
Summary
An important issue related to modern agriculture is the increase in the gross production of high-quality grain. Modern elevators are equipped with metal silos on a concrete foundation. Their height is limi ted by the carrying capacity of cargoes and does not exceed 30–60 m. Grain silos are loaded with scraper conveyors, which are located in the upper transport galleries. Grain cargo, which is transported to the loading holes of silos, may contain a certain percentage of already injured grain. The above-specified issues related to the storage and transportation of grain mass render relevance to the task of careful loading of grains into silos and necessitate finding ways to control the speed of grain movement for its gravitational loading without injury. This, in turn, requires the construction of an appropriate physical and mathematical model of grain movement at the surface of a given screw channel
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Eastern-European Journal of Enterprise Technologies
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
