6. Large Pitch Conveyor Chains
(4) F-rollers are exposed to extremely high load from the rakes attached to the chain. To extend the working life, bushings usually have a larger bearing area, which reduces bearing pressure. (5) Common chain sizes have tensile strength within the range of 68 to 490 kN. Sprockets Although these chains are based on RF conveyor chain, they require special sprockets because of the pitch (152.4mm = 6 inches). For S-roller type, insert- tooth sprockets are available. Selection and Handling (1) To select this chain, verify the chain tension required, and make sure to confirm the roller load and attachment strength (twisting moment and bending moment). (2) Allow for a safety factor to withstand peak loads during jam-ups. (3) Chain rollers might be exposed to high loads when following the curves of the guide rail. Make sure you take this load into consideration when selecting the chain. Minimize tension from the take-up (Figure 6.38). (4) Of course, you should avoid contaminating the water with oil, but when the test run of the equipment is performed without water, the chain’s moving parts should be lubricated.
Figure 6.38 High Roller Load Due to Curved Rail Corner Rail
Technical Trends Bar Screen Chain is required to perform with low noise levels, because it is now commonly used near populated areas.
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