Bearing Solutions for Underground Coal Mining Equipment

Coal mining shares challenges with general mining but adds gas (methane), fine coal dust, and corrosive water to the operating environment.

Key Applications:

- Shearers: Cutting unit planetary gears use tapered Roller Bearings and Cylindrical Roller Bearings; traction units use planetary gear bearings designed for shock and coal dust resistance.

- Roadheaders: Cutting head main shafts use heavy-duty Tapered Roller Bearings under large bending moments and impact.

- Armored face conveyors: Head and tail sprocket shafts use Spherical Roller Bearings; flight chains use maintenance-free bearings.

- Hydraulic roof supports: Rams and props use guide rings and plain bearings; some articulation points use spherical plain bearings.

- Belt conveyors: Idler rollers use Deep Groove Ball Bearings with long-life, maintenance-free designs and seals against coal slurry.

Selection Considerations: 

Underground equipment must meet explosion-proof standards, requiring controlled bearing temperature rise and friction. Coal slurry is both corrosive and abrasive, making sealing and material selection critical. Compact equipment spaces require bearings that maximize load capacity within limited dimensions.