Energy loss in the ribbon-tympanic mechanisms of the noria-elevators

Abstract

The given is method of calculation of energy losses in the ribbon-tympanic mechanism of a
noria-elevator and calculation of its efficiency coefficient. The works were considered, in which the
power losses were studied at the slide of the tape on the drum, and also approximate methods of
calculating the efficiency coefficient were developed. It was noted that in these works the tension of
the tape branches was calculated using Euler's formula for an inelastic thread, which made the
inaccuracies in the results obtained. In the resulted method the energy losses from flexural
deformation, from the deformation of the shear in the tape and from the elastic slip of the tape on
the drum are calculated. Taken into account the elastic properties of the tape, the coefficient of
friction in the friction pairs of the tape-drum, as well as the indicators of the traction ability of the
drive drum, as the arc of rest and slip. The tensions of the ribbon branches were determined by the
pulling force on the drum and the tension factor. The obtained results can be used to design of the
noria-elevators of any productivity and height.