In the pulp and paper industry machinery breakdowns cost an enourmous amount of money.
Therefore the preventive and predictive maintenance is very important.
Parallel rolls
The rolls of the papermaking machine has to be parallel to each other, otherwise
the final product (the paper) can be of bad quality. It can also make the paper break,
with costable downtime as result.For alignment of rolls the Parallelism equipment
is used. The most common method is as follows:
The D22 laser transmitter is mounted on a tripod, with the laser beam pointing
parallel to the machine. The Angular prism D46 (on a tripod too) then deflects the
beam 90° to be parallel to the rolls.
A D5 detector is placed horizontally at the
(radial) end of the roll, and the measurement value is recorded. Then the detector
is moved to the other end of the roll, and a new value is recorded.
This procedure
follows for each of the rolls to be measured. The Display unit shows both graphically
and digitally the parallelity between the rolls, with the base line or any of the rolls
as reference.
Flatness measurement of wire section
For flatness measurement of wire section the D22 laser and D5 detector
is used. The detector is placed at marked points at the section, the laser beam is
aimed to the detector, and values are recorded for each position. The result
shows the flatness compared to three zero (reference) points that can be altered.
The level of the rolls
To measure the level of the rolls, the D22 laser is levelled according to the built-in
vials. Then the detector D5 is placed vertically at both ends, and values are recorded.
Because the laser beam is levelled this will give the "horizontal" position of the roll.
Other examples of alignment needs
Other examples of alignment needs are alignment between gearboxes and cardan coupled shafts,
shaft alignment between pumps and motors, sheave/pulley alignment for fans, straightness
measurement of rolls, parallelism and flatness of foundations etc.
A. Level measurement of roll. Detector placed "vertically".
B. Parallelism measurement of roll. Detector placed "horizontally", angular prism deflecting beam.