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Mast Chain
Forklift Mast Chains - Leaf Chains comprise several applications and are regulated by ANSI. They are used for lift truck masts, for low-speed pulling and tension linkage, and as balancers between counterweight and head in some machine devices. Leaf chains are at times even known as Balance Chains.
Features and Construction
Leaf chains are steel chains using a simple link plate and pin construction. The chain number refers to the pitch and the lacing of the links. The chains have certain features like for example high tensile strength per section area, that allows the design of smaller mechanisms. There are B- and A+ kind chains in this series and both the BL6 and AL6 Series have the same pitch as RS60. Lastly, these chains cannot be powered utilizing sprockets.
Handling and Selection
Comparably, in roller chains, all of the link plates have higher fatigue resistance due to the compressive stress of press fits, while in leaf chains, only two outer plates are press fit. The tensile strength of leaf chains is high and the maximum permissible tension is low. If handling leaf chains it is vital to check with the manufacturer's instruction manual so as to ensure the safety factor is outlined and utilize safety measures all the time. It is a better idea to exercise extreme care and utilize extra safety measures in applications wherein the consequences of chain failure are severe.
Using a lot more plates in the lacing causes the higher tensile strength. In view of the fact that this does not enhance the maximum acceptable tension directly, the number of plates utilized could be restricted. The chains need frequent lubrication for the reason that the pins link directly on the plates, producing a really high bearing pressure. Using a SAE 30 or 40 machine oil is frequently advised for most applications. If the chain is cycled more than 1000 times day after day or if the chain speed is over 30m for every minute, it will wear extremely rapidly, even with continuous lubrication. Hence, in either of these situations the use of RS Roller Chains would be more suitable.
The AL-type of chains should just be used under particular conditions like for instance if wear is really not a big problem, when there are no shock loads, the number of cycles does not go over a hundred each day. The BL-type will be better suited under other conditions.
The stress load in parts will become higher if a chain using a lower safety factor is chosen. If the chain is also used amongst corrosive conditions, it can easily fatigue and break extremely fast. Performing frequent maintenance is really important if operating under these types of situations.
The type of end link of the chain, whether it is an outer link or inner link, determines the shape of the clevis. Clevis connectors or likewise called Clevis pins are made by manufacturers but often, the user supplies the clevis. A wrongly constructed clevis can reduce the working life of the chain. The strands should be finished to length by the maker. Refer to the ANSI standard or call the manufacturer.
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