BELTSTAT
A design tool and a computational aid to competent and
experienced conveyor design engineers. Using good engineering
judgment and conveyor design experience, users can quickly
arrive at the following conveyor design results: belt
width and speed; belt tension rating; counterweight tension;
horsepower rating of drive motors; drive motor starting
characteristics; idler specifications and spacing; pulley
and shaft design; vertical curve radii and required special
idler spacing; brake size (if required); flywheel requirements
(if applicable). Code development was commercialized in
1968. For more information on BELTSTAT, click
here.
BELTFLEX
A computer program used to model the elasto-mechanical
time transient behavior of a belt conveyor during starting
and stopping. Its value is in predicting excessive transient
forces in the conveyor system (e.g., shock waves analogous
to hydraulic "water hammering"), which can:
overload mechanical and structural components; cause material
instability on inclines and declines; cause abnormal vertical
curve behavior, such as lifting of the belt off the idler
bed or festooning of the belt at regions remote to the
control locations; cause unwanted take-up excitation or
validate the take-up response capabilities to meet the
design requirements; cause excessive belt sag resulting
in spillage, mal-tracking and large take-up motion. It
is used primarily as a final step in refining or validating
the design of conveyors in which the effects of the chosen
starting or stopping methods are not certain. BELTFLEX
simulates the transient behavior of the conveyor as explicitly
set forth by the conveyor designer, and will not make any
design selection or decision. Code development was commercialized
in 1980. For more information on BELTFLEX, click
here.
BELTCURV
A program used in the design of horizontal and vertical
curves for conventional belt constructions and idler sets.
The program determines the longitudinal and transverse
forces acting on the belt as the horizontal and vertical
curves are negotiated. Methods of controlling the lateral
shifting of the belt are provided to assure acceptable
guidance for all possible operating states. Belt constructions
are analyzed for edge and center stresses, and for transverse
stability.
PSTRESS
The CDI program used to predict the triaxial stresses
in the pulley hub, end disk and shell. The surface stress
imposed on the shaft by the locking mechanism is also
considered. The radial, axial, tangential and shear stresses
are separately analyzed on the metal's inside and outside
surfaces. The end disk shape can be of straight plate,
tapered or contoured. The stress influences from the locking
mechanism pressure, the direct belt force, the shaft bending
moment flexing the end disk, and drive shear stresses
are all considered. The combined stresses are analyzed
according to maximum shear stress and maximum distortion
energy theory. A fatigue stress criterion can be derived
from the identification of the maximum stress range fluctuation
for each principle stress at any of the 1440 element points
evaluated in the end disk or the associated critical points
in the shell.
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