4 Operating Principle
A belt weigher is designed to continuously weigh the
material amount transported on a conveyor belt.
Belt Load:
The material is guided to a weighing platform
arranged under the belt and limited by 2 carrying
idlers. Via one or multiple weighed idlers, the platform
load excerts a force on load cell (L/C).
The deflection for measurement is 0.2 mm. The
weighed idlers are connected with the frame structure,
e.g. with the use of a leaf spring parallel system.
Proportional to platform load, the load cell output
voltage is amplified and transferred to the INTECONT
microprocessor with the use of an analog-to-digital
converter.
The white triangle indicates the load distribution on a
single-idler platform scale. Only half of the material’s
weight force is applied to the weighed idler.
The translation of load ratio into platform length has
become accepted usage in weighing technology.
Leff = effective platform
length
Lg = total platform length
For weighing platforms equipped with multiple
weighed idlers, factor 1/2 is different.
Belt load in kg/m is thus:
QB = total load on
weighing platform.
Belt Speed:
A further measure for feed rate is belt speed v,
acquired with the use of speed transducer D and
translated into a corresponding pulse frequency.
If belt load is constant and more approximate
accuracy will suffice, speed measurement can be
omitted.
Feed Rate:
INTECONT normalizes physical units kg/m and m/s.
Multiplication of the two values results in feed rate I.
I in kg/s
v in m/s
Q in kg/m
QB in kg
Leff in m
I in kg/h:
I in kg/h
As to the rest,
see above.
0837
INTECONT PLUS VBW
Operating Principle
BV-H2214 GB 21
Transmission to third parties and reproduction of
this documentation are not permitted.
SchenckProcess GmbH reserves all rights of
ownership and copyrights.
Technische
Redaktion PDE-RD
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