Small flake back wheel
The small-flake rear wheel is the support wheel at the rear of the chain circuit on a flake-type chain grate. The chain runs around the front and rear wheels to form a closed loop and drives the grate surface continuously.
Its place in the chain circuit
The small-flake rear wheel mounts on the shaft end at the tail of the grate and is used together with the small-flake front wheel and the small-flake chain. The rim engages the chain links and turns the rotary motion of the chain into straight-line travel of the grate surface. The mating dimensions between the wheel body, the shaft and the bearing follow the original machine, and the chain pitch has to be matched when replacing.
Material and temperature resistance
The rear wheel can be cast in grades from HT200 to RTCr16, with temperature resistance covering 480℃ to 900℃; the common HT250 suits the grates of various boiler types. The wheel body is a load-bearing part, so the material has to balance strength and wear resistance.
| Material | Temperature resistance | Characteristics |
|---|---|---|
| HT200 | 480℃ | Simple process, low cost |
| HT250 | 520℃ | High strength, wear- and heat-resistant |
| RTCr16 | 900℃ | Good oxidation and corrosion resistance |
Matching parts and supply
The partner factory handles dispatch, and we can supply the small-flake rear wheel together with front wheels, chains, pins, bearings and other parts from the same series. For selection, please provide the grate model, the chain pitch and the dimensions of the old part; we can help check the material and quantity, and can also make parts to order.