6. Large Pitch Conveyor Chains
(3) The allowable load of the roller is increased. The allowable roller load for RF12000-R Bearing Roller Conveyor Chain is 8.35 kN, which is 1.6 to 3.3 times greater than the equivalent size of a basic type with lubrication (2.50 kN for nonheat-treated roller; 4.17 kN for heat-treated roller). Capacity of the roller for RF12000-R Bearing Roller Conveyor Chain is equivalent to RF26200-R Conveyor Chain with heat-treated rollers. This is two sizes larger. In horizontal and slightly inclined conveying, usually the chain size is determined by the allowable load of the roller. Because of the reasons we have discussed, you can select a chain two to three sizes smaller. Rollers are also exposed to high load when they engage with sprockets. Even though this load may be several times greater than the vertical load on rollers during conveying, it is within the capacity range of bearing rollers. (4) Lower maintenance. RF Bearing Roller Conveyor Chain has grease pockets on both its sides. Although we have received reports that these chains have been operated for five years without any maintenance, we suggest that you lubricate the bearing roller occasionally. (5) Longevity of the bearing roller. The bearing roller is large in diameter and short in length; therefore, failure due to foreign material getting inside it is rare. Some types of roller bearings are prone to failure due to foreign objects causing misalignment. (6) Accepting thrust load. A self-lubricating spacer is installed on both sides of the roller to accept thrust load. The spacer prevents a direct contact between the rotating roller and the side plate; therefore, wear particles getting inside the bearing is minimized. (7) Stick-slip resistance. Stick slip is virtually eliminated because of the low coefficient of friction in a wide range of speeds. Consult the manufactur- er when conveyor speed is less than 2 m/min. (8) Wide range of chain sizes is available. The ball bearings commonly avail- able on the market cannot be adapted for the needs of chains due to their limited load capacity. It is difficult to adapt ball bearings to rollers with diameters less than 45 mm, but roller bearings can be adapted for use by using the bushing and roller as bearing races.
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