Big flake roller
The big flake roller is fitted at the supporting points of the flake chain and rolls along the track with the chain, carrying part of the weight of the grate surface and the fuel bed. We supply this spare part, and it can be matched with the big flake chain, front wheel and rear wheel as a set.
Role in the chain circuit
A flake-type chain grate consists of an endless chain made of interlocking flake grate plates, chain links and pin shafts, and it runs continuously along the tracks on both sides. The roller is a supporting and rolling element that transfers the weight of the chain to the track and reduces running resistance. Once the roller is worn undersize or seizes, the chain becomes hard to move and starts to skew.
Material and heat resistance
Roller material is determined by the original drawings and furnace temperature; Cr25Ni20 cast alloy steel can be used in high-temperature sections, while structural parts use standard carbon steel. Heat resistance temperatures of common castings from the partner factory are as follows:
| Material | Heat resistance temperature | Suitable fuel |
|---|---|---|
| RTCr5 | 700℃ | High-calorific coal, biomass |
| RTSi5 | 800℃ | High-calorific coal, biomass |
| RTCr16 | 900℃ | Various high-calorific coals, biomass |
| RTQSi2 | 1200℃ | Various coals, biomass |
Machining and inspection
The roller is precision cast and machined, with mating surface dimensions held by the machine tool. Material composition and overall dimensions are checked batch by batch before delivery, and technical standard NB/T 47050-2016 is applied.
Selection and matching parts
We can supply the roller together with the chain, chain links and pin shafts as a complete set. Material and dimensions can be customised to customer requirements, and we provide selection advice and installation technical support.