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Leaf chains are steel chains utilizing a simple link plate and pin construction. The chain number refers to the lacing of the links and the pitch. The chains have particular features like for instance high tensile strength per section area, which enables the design of smaller machines. There are B- and A+ kind chains in this series and both the BL6 and AL6 Series contain the same pitch as RS60. Finally, these chains cannot be driven utilizing sprockets.
Comparably, in roller chains, all of the link plates have higher fatigue resistance because of the compressive stress of press fits, while in leaf chains, just two outer plates are press fit. The tensile strength of leaf chains is high and the utmost permissible tension is low. Whenever handling leaf chains it is vital to check with the manufacturer's catalogue in order to ensure the safety factor is outlined and use safety measures always. It is a good idea to apply utmost care and use extra safety guards in functions where the consequences of chain failure are serious.
Using more plates in the lacing leads to the higher tensile strength. As this does not improve the most allowable tension directly, the number of plates utilized may be limited. The chains need frequent lubrication as the pins link directly on the plates, producing a very high bearing pressure. Utilizing a SAE 30 or 40 machine oil is often advised for the majority of applications. If the chain is cycled more than one thousand times each day or if the chain speed is over 30m for every minute, it will wear very quick, even with constant lubrication. Hence, in either of these conditions the use of RS Roller Chains will be much more suitable.
The AL-type of chains must only be used under certain situations like when wear is really not a huge problem, if there are no shock loads, the number of cycles does not go beyond a hundred every day. The BL-type would be better suited under other conditions.
If a chain with a lower safety factor is chosen then the stress load in components will become higher. If chains are used with corrosive elements, then they could become fatigued and break somewhat easily. Performing regular maintenance is really important when operating under these types of situations.
