Big flake back bearing
The big flake back bearing is mounted on the rear wheel shaft and supports the turning section at the rear end of the flake chain. We supply this spare part, shipped as a set from the partner factory to the original machine’s dimensions and material requirements.
Installation position and loads
The grate surface of a flake-type chain grate consists of interlocking flake grate plates; chain links group the flakes together, pin shafts form the hinges, and the whole chain runs continuously around the big flake front wheel and rear wheel. The big flake back bearing sits at both ends of the rear wheel and carries the load as the chain turns. Once bearing clearance grows, the chain tends to run off-centre and abnormal noise appears.
Material selection
Bearing material is determined by the original drawings and furnace temperature. Ductile iron and alloy steel castings are available, and Cr25Ni20 cast alloy steel can be used at hotter locations. The heat resistance temperatures of common materials from the partner factory are as follows:
| Material | Heat resistance temperature |
|---|---|
| HT200 | 480℃ |
| HT250 | 520℃ |
| RTCr | 550℃ |
| RTCr2 | 600℃ |
| RTCr16 | 900℃ |
Matching parts and inspection
This spare part is usually checked in the same batch as the big flake rear wheel, big flake chain, big pin shaft and big flake splint pin shaft, so that fitting dimensions do not mismatch. All parts are precision cast and machined, and the product meets technical standard NB/T 47050-2016.
Selection and supply
We can supply the bearing together with the adjacent wheel set, chain and pin shafts as one complete set, with dimensions confirmed against drawings or physical samples provided by the customer. During project execution we provide technical drawings, installation guidance and commissioning support.