Chains

Installation &
Maintenance
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Chain jumps on the sprocket or does not release well
Possible causes
Chain is elongated or sprocket is worn-out. Elongation of the
chain can be caused by wear or due to severe overloading,
caused by e.g. jams.
Improper catenary sag.
Sprocket is worn (teeth show a hooked profile).
Wrong sprocket type is installed
Improper sprocket position
Remedy
Replace chain and sprocket and chek also other conveyor
components for severe wear to find exact cause.
Make sure catenary sag is in right position and has the correct
dimension
Replace sprockets.
Install right sprockets.
Position sprockets at the right height and distance from the
wearstrips.
Jerky chain operation
Possible causes
This problem can occur with relatively long conveyors,
operating at relatively low speeds. This is usually caused by
so called "slip stick" effects, which are caused by the
differences between the dynamic and static coefficient of
friction.
Return roller diameter is too small.
Chain catches the conveyor.
Remedy
Use lubrication if possible.
Reduce chain tension by shortening the conveyor.
Install larger diameter roller.
Remove obstructions in the conveyor and make sure the
chain moves smoothly in the returnpart.
Chain hinges are damaged
Possible causes
Severe rapid elongation of the chain is usually caused by
overloading, due to jams.
Blocking and obstruction in conveyor.
Exceeding the minimum backflex radius of the chain in the
return section.
Remedy
Replace chain and check other conveyor components like
sprockets, alsofor severe wear.
Check the conveyor for possible obstructions, by pulling a
small piece of chain through the conveyor manually.
Install larger rollers in positions where chains are bent
excessively in backflex radius.
Chain is elongated
Possible causes
Dirty hinges
Remedy
Clean chain thoroughly and improve cleaning procedure.
Rapid curve wear
Possible causes
In dry running lines with plastic chains, the PV limit can be
exceeded.
In lubricated lines with abrasive particles (stainless steel
chains). These particles can be the cause.
Remedy
Check application with calculation programme and replace
curve upperpart by NYLATRON upperpart if programme
dictates so.
Replace upperpart by NYLATRON upperpart.
www.bergab.ru Берг АБ bergab@ya.ru Тел. 118 (495)-228-06-21, факс (495) 223-3071