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Tube mills are heavy machines that grind the material by the rotation of the grinding drum and of the grinding bodies (balls or rods). Essentially, they consist of a horizontal, slightly inclined grinding tube and covers with hollow trunnions at both ends through which the grinding stock is fed in and discharged.
The biggest tube mills have trunnion diameters of up to 1800 mm.
These trunnions are supported in self-aligning spherical roller bearings of dimensional series 238, 239, 248 and 249 and special housings.