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Leaf chains are steel chains using a simple link plate and pin construction. The chain number refers to the lacing of the links and the pitch. The chains have certain features such as high tensile strength per section area, which enables the design of smaller mechanisms. There are A- and B- type chains in this series and both the AL6 and BL6 Series contain the same pitch as RS60. Finally, these chains cannot be driven with sprockets.
Comparably, in roller chains, all of the link plates maintain higher fatigue resistance due to the compressive stress of press fits, whereas in leaf chains, only two outer plates are press fit. The tensile strength of leaf chains is high and the most allowable tension is low. If handling leaf chains it is vital to confer with the manufacturer's instruction booklet to be able to guarantee the safety factor is outlined and utilize safety guards all the time. It is a good idea to apply extreme caution and utilize extra safety measures in applications where the consequences of chain failure are serious.
Using much more plates in the lacing causes the higher tensile strength. Since this does not enhance the most permissible tension directly, the number of plates utilized could be limited. The chains require frequent lubrication for the reason that the pins link directly on the plates, generating a very high bearing pressure. Using a SAE 30 or 40 machine oil is often suggested for the majority of applications. If the chain is cycled more than 1000 times each day or if the chain speed is over 30m per minute, it will wear extremely rapidly, even with constant lubrication. Hence, in either of these conditions the use of RS Roller Chains would be more suitable.
AL type chains are only to be utilized under particular conditions such as where there are no shock loads or if wear is not really a huge problem. Be positive that the number of cycles does not go beyond 100 each day. The BL-type will be better suited under different conditions.
If a chain with a lower safety factor is chosen then the stress load in components would become higher. If chains are utilized with corrosive elements, then they could become fatigued and break rather easily. Performing frequent maintenance is really essential if operating under these kinds of conditions.
