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Mast Chains
Mast Chains - Leaf Chains have various applications and are regulated by ANSI. They are meant for tension linkage, forklift masts and for low-speed pulling, and as balancers between counterweight and head in several machine tools. Leaf chains are occasionally even known as Balance Chains.
Features and Construction
Constructed of a simple link plate and pin construction, steel leaf chains is identified by a number that refers to the pitch and the lacing of the links. The chains have specific features like high tensile strength for each section area, which allows the design of smaller devices. There are A- and B- type chains in this particular series and both the AL6 and BL6 Series include 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 maintain higher fatigue resistance because of the compressive stress of press fits, whereas in leaf chains, just two outer plates are press fit. The tensile strength of leaf chains is high and the most acceptable tension is low. When handling leaf chains it is vital to confer with the manufacturer's guidebook in order to ensure the safety factor is outlined and utilize safety measures at all times. It is a better idea to carry out utmost care and use extra safety measures in applications where the consequences of chain failure are serious.
Utilizing a lot more plates in the lacing results in the higher tensile strength. For the reason that this does not enhance the most permissible tension directly, the number of plates used could be limited. The chains require regular lubrication for the reason that the pins link directly on the plates, generating an extremely high bearing pressure. Using a SAE 30 or 40 machine oil is frequently suggested for most applications. If the chain is cycled over 1000 times daily or if the chain speed is more than 30m for every minute, it would wear really quick, even with continual lubrication. Therefore, in either of these conditions the use of RS Roller Chains would be a lot more suitable.
The AL-type of chains must just be utilized under certain conditions like if wear is not a huge concern, when there are no shock loads, the number of cycles does not go beyond one hundred every day. The BL-type would be better suited under different situations.
If a chain with a lower safety factor is selected then the stress load in parts would become higher. If chains are used with corrosive elements, then they can become fatigued and break quite easily. Doing frequent maintenance is really essential if operating under these types of conditions.
The kind of end link of the chain, whether it is an outer link or inner link, determines the shape of the clevis. Clevis connectors or Clevis pins are made by manufacturers but normally, the user supplies the clevis. An improperly constructed clevis can decrease the working life of the chain. The strands should be finished to length by the producer. Check the ANSI standard or call the maker.
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