Big flake chain

The big flake chain strings the interlocking flake grate plates into a loop and runs continuously along the tracks on both sides of the grate; it is the main body of the moving grate surface. We supply the complete chain, and also individual chain links, pin shafts and other fittings.

Composition and connections

The flake grate plates overlap one another to form a continuous grate surface, chain links group the flakes together, and pin shafts pass through the links to create the hinge points; the two ends of the chain run around the big flake front wheel and the big flake rear wheel respectively. Inside the furnace the chain carries the weight of the combustion layer and high temperature, and the hinge points are where wear appears first. When replacing a chain, the specifications of the chain links, pin shafts and grate plates need to be checked item by item.

Material and typical service life

Cr25Ni20 cast alloy steel is the common choice for the chain body and chain links, Inconel is available as an alternative for pin shafts, and the grate plates can be Cr25Ni20 / Cr26Ni12. The specifications and typical service lives quoted by the partner factory are as follows:

Dimensional tolerances and inspection

All parts are made to OEM dimensions and tolerances, with precision casting and machining so that the hinges move freely during assembly. The product meets technical standard NB/T 47050-2016, and the material can be customised to customer requirements.

Supply and selection

Both complete chains and loose parts ship from the partner factory. We provide selection advice and matching spare parts, confirming the number of links and dimensions against the customer’s drawings.