Abstract
The dynamics of interaction of the large lumps of the bulk cargo with a conveyor belt while passing through roller supports of the conveyor linear sections is often a cause of damage on the conveyor belt. In order to reduce the negative impact it is proposed to isolate the conveyor belt surface from the large lumps by filling small fractions of the bulk cargo by means of adding a shock device to the conveyor structure that causes increased segregation of the bulk cargo. A mathematical model of the segregation of the bulk cargo located on the conveyor belt and in zone of impact of the shock pulses has been developed. The model considers a change in the rotation direction of the large lump when applying shock pulses to the characteristic points of the lump lower face. Herewith it takes into consideration weakening of the shock pulse by a layer of the bulk cargo small fractions. The presented model has received experimental confirmation. Analytically and experimentally the height of filling of the bulk cargo small fractions under a large lump when passing the vibrating impact device located on the conveyor belt has been determined.
Highlights
The material segregation occurs when a cargo is moved by different models of transport [1 10]
In order to speed up filling formation from the small fractions of the bulk cargo, it is proposed to install a device under the conveyor belt that transmits vibration shock pulses to the bulk cargo after a certain period of time in the immediate vicinity of the loading site
As a result of the lump movement on the conveyor belt at the point of application of the shock pulse is continuously shifted along the lump length, so the moment from the impact force instantaneous value when the first half of the lump passes in the direction of the impact device will be determined as: MF у (D,t) Fу(t,l, hу )cos(D D f (S,lk )) (a ' (n 1)('I TV )), (13)
Summary
The material segregation occurs when a cargo is moved by different models of transport [1 10]. The segregation of the material by size can have a positive influence on the dynamics of interaction of the large lumps bulk cargo with the conveyor belt when passing roller supports of the linear sections.
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