Lenze DSD - Manual (Page 144)

7 Applications
7.12 Belt conveyors for unit loads
144
Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
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7.12 Belt conveyors for unit loads
A belt conveyor for unit loads transports the material to be conveyed (e. g. boxes, pallets) by means
of a transport belt. Because of the smooth surface it is suitable for different sizes of unit loads and
unstable packaged goods. Basic features are the smooth and noiseless running and the careful
transport of goods. Depending on the material to be conveyed, belt conveyors can usually be used
for slopes of up to 20°, in individual cases and with specific designs even for slopes up to 60° .
In the upper strand the conveying belt slides on a surface, in the lower strand it can be guided by
rolls. In the lower strand usually also the belt is tightened by means of a clamping device or clamp-
ing unit in the form of guide pulleys that can be shifted. The power transmission between the belt
and drive roll is effected by means of adhesion.
With regard to the mounting position of the drive, end drives (position at the end, below the belt,
or at the side next to the belt) and centre drives (position in the centre, below the belt) are differen-
tiated. In the case of the end drive that is located at the side usually a bevel gearbox or helical-bevel
gearbox is used. The output shaft of the gearbox directly actuates the drive roll. In the case of the
end drive that is located below the belt predominantly helical gearboxes are used and the drive roll
is actuated by means of belts.
7.12.1 Calculations
For a belt conveyor for unit loads according to the drawing the following applies:
Total moment of inertia
[7-130] Equation 1: Total moment of inertia
J
sum
m
L
m
Blt
+ ( )
d
2 1000 / mm m ⋅
------------------------------------
 
 
  2
J J
aux
+ + ⋅ =