PRODUCTION AND EQUIPMENT
PREREQUISITES FOR THE CREATION
OF ENERGY-CONSERVING CONSTRUCTIONS
OF TUBULAR BELT CONVEYORS
S. Ya. Davydov,
N. P. Kosarev,
N. G. Valiev,
G. A. Boyarskikh,
and M. S. Filatov
Translated from Novye Ogneupory, No. 10, pp. 22 – 26, October, 2016.
Original article submitted June 7, 2016.
A description of different constructions of tubular belt conveyors with spherically shaped rollers is given.
Through use of the functional relationships between the tribotechnical assemblies of the conveyors, the energy
losses caused by friction and wear of the service elements are determined, their contribution to rolling and
sliding friction established, and the significance of each technical and economic criterion of the relative com-
petitive advantage of alternative variants of tubular belt conveyors determined.
Keywords: tubular belt conveyors, spherical rollers, cylindrical form, tribotechnical elements, energy costs
Tubular belt conveyors, which serve to protect the envi-
ronment by enabling transportation in closed spaces, have
been widely employed in different branches of industry.
Special features of foreign tubular belt conveyors is that
the conveyor belt is rolled inside a tube and that its edges
form an overlapping zone (the edges of the tube overlap each
other) in the upper part of the tubular surface where the ma
terial being transported is found. The size of the overlapping
zone depends on the type of belt, the bulk density and size of
the blocks of material being transported, and the setting step
of the idlers [1 – 7].
The closed system assures ecological adaptability to the
environment and makes it possible to establish a route with
bends in three-dimensional space as well as guaranteeing re
liable transportation of loads of different densities, moisture
content, and particle size.
The conveyor belt created in the tube may bend in
three-dimensional space, which makes it possible to design a
conveyor system on the basis of a continuous belt without
additional transfer stations. The speed of a tubular conveyor
belt may significantly exceed the speed of an ordinary belt.
The tubular shape assures lesser sagging between the idlers
and hermetic sealing of the load, thus eliminating spillage.
Industrial use of tubular conveyors has shown that it is
difficult to incorporate roughing rollers in the cross-section
of these conveyors. Significant forces of resistance to the ro-
tation of the rollers arise even with insignificant warping of
the installed roughing rollers relative to the moving belt. This
occurs due to the creation of friction between the surfaces of
the rollers of the tribotechnical system, which affects the
friction coefficient, and this, in turn, is reflected in the energy
costs, service life, and degree of failure-free performance of
the structural elements of the conveyor.
There have been numerous investigations that have stud
ied the contact interaction of the belt with rollers. To arrive at
a comparative assessment we will use research studies that
focused on the stresses and strains along a segment of the
belt situated in the plane .
The stresses and strains that arise in the zone of contact
of the belt with a roller were considered, assuming that the
load is not distributed uniformly relative to the roller genera
tor . The following assumption was adopted: the resulting
lateral force F
of certain forces supports uniform forward
movement of a belt traveling at a speed v
directed at an angle
a to a line perpendicular to the axis of the roller (Fig. 1). The
angle a is composed of the angle of azimuth W relative to the
X-axis of the conveyor and the angle b between the direction
Refractories and Industrial Ceramics Vol. 57, No. 5, January, 2017
1083-4877/17/05705-0462 © 2017 Springer Science+Business Media New York
FGBOU VO Ural State Mining University, Yekaterinburg,