Stick Slip
A
chain wheel works as a polygon. When entering and leaving the wheel, the
chain moves up and down in relation to the center of the wheel. This
motion causes acceleration and deceleration, which in turn cause forces on
structure. This is called polygon effect. The more teeth and
the lower the pitch of the drive wheel, the less polygon effect. A big
radius on the drive wheel reduces stick slip.
What
can be done to remove stick slip?
End
Drive: Check that the slide rail is properly mounted and that the chain
passes through without sticking along the conveyor. Remove or add on a few
links. This can also solve the problem. It may also help to
lubricate, but it is important to make sure that you use the correct type of
lubricant.
Catenary Drive: When this
occurs in a catenary drive, Flex-Line can offer a solution to remove stick slip,
especially when palletizing. The following parts can be ordered: XL
#5045678 XM #5048825 XK #5048826
Operating
Temperatures
A FlexLink conveyor can
operate in temperatures between -20 degrees C and + 60 degrees C.
Temperatures up to +100 degree C can be taken for short periods. This is
mainly for cleaning and rinsing.
What
happens if you exceed these limits? In cases where the recommended
specifications have not been ollowed, such as in very warm and cold conditions,
the properties of the materials used will change.
FlexLink
cannot guarantee components and their functionality in cases where the
temperature recommendations are exceeded.
Resistance
to Chemicals
The FlexLink conveyor can
withstand most chemicals used in a normal plant environment. It is
important to know which chemicals are being used before determining which
materials are best suited for the application. Depending on the chemicals
used, a more concentrated form of the chemicals may result in increased swelling
of the materials that are subjected to it.
If
you are in question, a chemical test should be performed. The following
procedure tests the absorption of the materials by measuring the swelling.
This should be done in two temperatures: 20 degrees C and 60 degrees C.
The test in 60 degrees C represents long term exposure at room temperature.
-
Put a sample of the material that you wish to
test into the chemical solution that is going to be used.
-
Measure the changes in weight and length
after 2, 4, and 7 days. If the geometry exceeds (1%), then the test
should be regarded as negative, meaning that the chemical is not compatible
with the material.
When chemicals are used, it is recommended to use
XLCR 25P slide rail because it has a good resistance to oils and chemicals.
Please refer to your
FlexLink catalog for more information on the proper application of FlexLink
components or call our engineering department at 800-916-0031.
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