Mast Chains - Leaf Chains comprise several applications and are regulated by ANSI. They are meant for lift truck masts, for low-speed pulling and tension linkage, and as balancers between counterweight and head in several machine devices. Leaf chains are sometimes likewise referred to as Balance Chains.
Construction and Features
Leaf chains are steel chains with a simple link plate and pin construction. The chain number refers to the lacing of the links and the pitch. The chains have specific features like for instance high tensile strength for each section area, which enables the design of smaller mechanisms. There are B- and A+ type chains in this particular series and both the BL6 and AL6 Series comprise the same pitch as RS60. Lastly, these chains cannot be driven with sprockets.
Handling and Selection
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, only two outer plates are press fit. The tensile strength of leaf chains is high and the most permissible tension is low. While handling leaf chains it is essential to consult the manufacturer's manual to be able to guarantee the safety factor is outlined and use safety guards always. It is a great idea to carry out utmost care and use extra safety guards in applications wherein the consequences of chain failure are severe.
Utilizing a lot more plates in the lacing results in the higher tensile strength. For the reason that this does not improve the most allowable tension directly, the number of plates utilized can be limited. The chains require regular lubrication as the pins link directly on the plates, producing a really high bearing pressure. Making use of a SAE 30 or 40 machine oil is frequently advised for most applications. If the chain is cycled over 1000 times on a daily basis or if the chain speed is over 30m for each minute, it would wear extremely fast, even with constant lubrication. Therefore, in either of these conditions the use of RS Roller Chains will be more suitable.
AL type chains are only to be used under certain conditions like where there are no shock loads or when wear is not really a big problem. Make positive that the number of cycles does not go over 100 every day. The BL-type would be better suited under different conditions.
The stress load in parts will become higher if a chain using a lower safety factor is chosen. If the chain is likewise used among corrosive conditions, it could easily fatigue and break really fast. Doing frequent maintenance is important when operating under these types of situations.
The kind of end link of the chain, whether it is an inner link or outer link, determines the shape of the clevis. Clevis connectors or also called Clevis pins are made by manufacturers but usually, the user provides the clevis. An improperly made clevis could reduce the working life of the chain. The strands should be finished to length by the maker. Refer to the ANSI standard or contact the maker.
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