14 RF Conveyor Chain Installation and Layout
Adjustment of Chain Tension The correct amount of chain slack is essential for proper chain operation. When the chain is too tight, working parts such as sprocket wheels, shafts, bearings, etc., carry a much heavier load. However, too much chain slack is also harmful and causes the chain to climb the sprocket teeth. Frequency of Adjustment Chain has a tendency to stretch a certain amount at the beginning of operation due to slight distortion of its component parts. After such initial elongation, the chain stretches slightly, but constantly, through normal wear. To maintain proper chain tension, necessary adjustments should be made at regular intervals. Frequency of adjustment: First week of operation: Once per day Second to fourth week: Twice per week Thereafter: Twice per month
Note: This frequency schedule is based on daily eight-hour operation. If working hours are increased, the frequency of adjustment should be increased accordingly.
Even Adjustment of Take-up on Both Sides This can be easily obtained with cooperating screw type or counterweight type take-ups. When two parallel chains are adjusted by two independently operated take-ups, care must be taken to ensure an even stroke on both the left and right sides. Uneven adjustment will cause the link plate and the side of the sprocket teeth to interfere with each other and result in an overload position.
Figure 14-1: Take-up Units
Insufficient Take-up Adjustment If the chain is still too long after complete take-up adjustment, shorten it by removing two links.
24 I NSTALLATION & M AINTENANCE
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