Use of theoretical mathematical relations for calculating the application and mass flow rate of a rear delivery vertical-axis manure spreader

Abstract

Abstract. In the context of protecting and maintaining the health of the population, development and implementation of technically innovative, high performance solutions for manure spreading machinery, is an important research direction worldwide and in Romania as well. Pursuing concerns of the manufacturers and researchers in the field, there is an enhanced interest in the production of equipment for fertilization, starting with classic trailers with rear delivery horizontal-axis beaters, followed by the rear delivery vertical-axis beaters, side delivery flails, and finally reaching the advanced equipment comprising a rear delivery centrifugal table with automatic flow control. Based on the theoretical relations of mass flow rate, and considering a coefficient of correction due to material compression in the hopper, one can determine the application and discharge rates that can be achieved with a manure spreader equipped with vertical rotors in different working conditions. The difference between the conveyor speed and the speed of conveyed material as well as the friction between material and the hopper walls is also considered.