Interpretation Of Results - TomTom Inductive Distance Measurement Tool Kit II User Manual

 Page 17
7.5

Interpretation of Results

To detect a crank on a 3 Pier Kiln, measuring the roller shaft bending on the middle pier is normally
sufficient. Both rollers of a pier deflect typically the same way.
In case of high values, it is recommended to measure both rollers on the middle pier, to double
check if really a strong crank is present or if some looseness in a bearing or foundation is causing
the high values.
Note:
TomTom-Tools GmbH does not provide guide lines about roller shaft limits.
It has to be according to the equipment manual or discussed with the suppliers, how much roller
shaft bending can be allowed.
Nevertheless based on the experience of different kiln supplier the following guide values were
established.
It has also been seen, that the values are valid for small and for big kilns, because the ratio
between the load on the rollers and the dimensions is for all kilns similar.
Roller Shaft Bending Value:
> ±0.2mm
> ±0.15mm...±0.2mm
0...±0.15mm
The position of the crank peak is indicated by the angle in ° (deg) relatively to the reference point
on the kiln shell (e.g. manhole).
For example, the value 167° means that the peak of the crank is located 167° after the manhole
(consider the sense of kiln rotation).
Note:
The angle value of the crank peak is not important to judge the severity of a crank, but it helps to
find out, if it is a permanent or a thermal crank.
Thermal cranks occur randomly; hence the peak angle will change.
Permanent / mechanical cranks stay on the same position, hence the peak
angle will stay more or less same (within ±30°), at least in the same quadrant of
the kiln. In case of indication for a permanent crank, it is recommended to perform
the roller shaft bending measurement also in cold kiln condition (~2 revolutions
with auxiliary drive) to be sure; no thermal effect is taking place.
Optional:
For narrow space,
flat sensor to measure
roller shaft bending
2
4
1
3
HH Alarm
H Warning
Normal
1 brown (+24VDC)
2 white (0-10V)
1
2
3 blue (-)
4 black (=2)
3
4
April 4, 2022