Cement plant
Housed bearing units on conveyors, fans and screens
What a housed unit is, how much misalignment it tolerates, and how to choose seals and locking.
What a housed unit is
A housed unit is a bearing, seals and housing delivered as one assembly. It is the usual choice on conveyors, fans and screens because it is quick to fit and handles dust.
Common types
| Type | Typical size | Notes |
|---|---|---|
| Tapered roller, solid block | 35 to 125 mm bore | Double-lip seals, corrosion-resistant coating |
| Spherical roller, solid block | 35 to 180 mm bore | Several seal and locking options, works on shaft misalignment up to about ±1.5° |
| Spherical roller, split block | 35 to 495 mm bore | Taper or straight bore, converts from fixed to floating by removing the stabilising ring |
| Ball, housed | 17 to 75 mm bore | Light loads, many locking collar options |
How to choose
- Use seals matched to the dust: several layers and steel covers for heavy dust.
- Choose the locking method for the load and speed: adapter sleeve for heavy duty, collar for light duty.
- A split housing helps when the shaft cannot be moved.
- Allow for axial float if the shaft grows with heat.
Care
- Keep the housing base flat and shimmed.
- Do not over-grease: a full housing runs hot.
- Check alignment of the shaft and the housing at every service.
Takeaway. Match the seals and locking to the dust and the load. The bearing inside is usually the easy part.
Put it to work in the tool