DID 60 standard roller chain - Big Bike Webshop

Technical Data Installation, Adjustment and Maintenance
Technical Data
Tension Adjustment of Conveyor Chain
Overly tight or sagged conveyor chain cannot be smoothly
operated. Especially, an overly sagged chain rides over
sprockets and interferes with the rail, etc. So, check chain
condition at appropriate timing and adjust the chain for
proper operation.
Timing of Adjustment
At the beginning of operation, a chain causes initial
elongation, and subsequently is elongated due to steady
wear. Usually the components of a chain are hardened
on the surface, and if the hardened layer is exhausted,
elongation progresses rapidly. So, periodical checks are
necessary.
¡Check frequency for 8-hour per day operation
Within one week after start up of operation
Within one month after start up of operation
One month after start up of operation Twice monthly
This table shows a general case. In the case of continuous
operation, operation in abrasive or corrosive environments,
increase the check frequency.
(Cautions)
¡Also for a chain with tension automatically adjusted by
counter weight take-up or spring take-up, confirm
whether the tension device functions properly.
¡When high-temperature articles are conveyed, be sure to
adjust the take-up since the chain expands or contracts
remarkably when the conveyor is started or stopped.
Adjust Take-up by Two People
The take-up adjustment must be performed equally on
both sides. So, one person is required to check the
tension of chain, while the other carries out adjustment.
For adjustment, alternate tension on both sides little by
little. When chain is tensioned too tightly on one side only,
accidents are caused. Be sure to position the chain at the
centers of the teeth of the sprockets. When the chain is
not positioned at the centers of teeth, adjust by tightening
the side with a clearance between the sprocket and the
chain, or loosen the side where the sprocket is in contact
with the chain.
Tughten the take-up.
Loosen the take-up.
Once daily
Once weekly
Clearance
Tooth of sprocket
¡With a horizontal conveyor, irrespective of top or bottom
conveyance, the sagging is usually eliminated on the
chain return side at a portion immediately after or
downstream of the driving sprocket.
¡With a straight gradient conveyor, the point where the
sagging is eliminated depends on the gradient angle
and the kind of conveyor, so refer to the instruction
manual, etc.
¡With an L-type or S-type conveyor, sagging is eliminated
at the bend case.
Tension Adjusting Degree
The degree of tension adjustment is determined with
reference to the following conditions.
¡The chain smoothly departs from the sprockets.
¡Spaces are secured to keep the chain, attachments,
pans, etc. from interfering with the rail and frames.
¡Appropriate tension is given to prevent surging.
For example, for a horizontal continuous flow conveyor,
adjust the sag depth to about = L /10 ~ L /20.
No chain stripper
With chain stripper
However, in the following cases, increase the adjusting
frequency and set to = L /15 ~ L /25.
¡Intermittent operation of conveyors
¡High-temperature loads
¡High chain speed (25m/min or more)
¡Heavy and/or large chains
With L-type continuous flow conveyor, adjust the tension
to keep the chain directly visible from the inspection hole.
The dimension is RL/2.
Overly tight or sagged chains may cause accidents.
Inspection window
Maintenance
Shorten the Chain Before Elongation Limit
The chain tension is adjusted by take-up. However, cut
short the chain before the elongation comes close to the
limit. An overly sagged chain causes troubles due to
interference and contact.
Check Point
Chains sag generally at one place. Therefore, confirm at
first what point of the conveyor should be checked.
Furthermore, ensure the safety of the area to be checked.
Deposition of conveyed object
On the bottom of case, the conveyed articles are often
deposited. So, periodically clean the inside, to secure
space for slackening of chain.
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