MHS Boilers XenoROL XR40, Инструкция по установке, эксплуатации и обслуживанию, Страница: 62 / 84

XenoROL®
62
REPAIR PROCEDURES
COUPLER CHAINS
If the coupler failed from torque fatigue, analyze the
amount of conveyor driven from that coupler.
Perhaps the drive load can be shared better with
adjoining conveyors. If the coupler failed from line-
shaft misalignment, this condition must be corrected
before the new chain is installed. (Ref. installation
procedures for coupler chains on page 19 & 20). If
corrective steps are not taken to address the cause
of breakage, the replacement coupler chain will
probably also fail. The set screws in coupler
sprockets must be torqued to 13 ft-lb.
CHAIN & SPROCKETS
Lubrication of roller chains is essential to effectively
minimize metal-to-metal bearing contact of pin-
bushing joints in the chain. Oil should be applied to
outside and inside plate edges, since access to the
pin-bushing area is possible only through clearances
between the outside plates and the inside plates. Oil
applied on the center line of the rollers cannot reach
pin-bushing joints.
Chain drives should be protected against dirt and
moisture. Oil supply should be kept free of
contamination. A good grade of non-detergent
petroleum base oil is recommended. Heavy oils and
greases are generally too stiff to enter and fill the
chain joints. The following table indicates the proper
lubricant viscosity for various surrounding
temperatures.
Temperature
Degrees F
Recommended
Lubricant
20 TO 40 SAE 20
40 TO 100 SAE 30
100 TO 120 SAE 40
120 TO 140 SAE 50
Inspection includes:
1. Lubrication check for dirt, grit, or chips
and clean if necessary by soaking chain
in nonflammable cleaning solvent
2. 2. Sprocket alignment (see following
text)
3. Wear on the inner surfaces of the roller
chain link plates
4. Sprocket tooth wear
5. Chain tension (see following text)
6. Set screw tightness (5/16-18 at 13 ft.lbs.
and 1/4- 20 at 6 ft.lbs.)
SPROCKET ALIGNMENT
1. Loosen sprocket.
2. Align loose sprocket to the other by
laying a straight edge across their faces
or along the chain.
3. Retighten the loose sprocket.
CHAIN TENSION
Chain should be checked for excessive slack, if the
chain is running close to the tips of the sprocket
teeth.
This can be checked by lifting the chain away from
the large sprocket, making sure the chain is in mesh
with the sprocket teeth. Excess clearance is
conclusive evidence that the chain has elongated in
pitch and no amount of tension adjustment will keep
it properly meshed with the sprocket teeth.
Continued operation will quickly destroy the sprocket
teeth which otherwise may be good. If the sprocket
is still serviceable, replace the chain.
TENSION ADJUSTMENT
1. Loosen mounting bolts of tension.
2. Increase tension up to 1/2" of total slack
(1/4" each way of center).
3. Turn adjusting bolts on gearbox plate or
move gearbox in mounting slots until
there is 1/2" total chain slack.
4. Retighten all bolts after checking
alignment.
If chains have stretched so that above adjustments
cannot be made, remove a link and reconnect. (If
removal of one link makes the chain too short, add
offset link and reconnect.)
If a chain should break or fail due to overload,
neglect or accident, those portions of the chain
which appear to remain intact are, in all probability,
damaged and subject to early failure if continued in
service. Replace the entire chain and sprockets.
WARNING
Do not perform maintenance on the conveyor until the start-up controls are locked out and cannot
be turned on by any person other than the one performing the maintenance. If more than one
member of a crew is working on the conveyor, EACH CREW MEMBER MUST HAVE A LOCK ON THE
POWER LOCK OUT. The air pressure must be turned off to the work areas. Make sure personnel are
clear of all conveyor equipment before restarting the system.
Do not use gasoline or kerosene for cleaning. Use nonflammable solvent only.
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