Metso Introduces a New Concept in Mill Liners
Mill availability is improved through faster liner replacement. Megaliner, said Metso, uses larger than average liners yet these can still be placed with the same 6- to 8-axis liner handlers commonly used with large AG mills. Using larger liners means mills require fewer of them and Megaliner also has fewer attachment points compared with conventional liners, speeding up instal-lation even further. Liners are easily and accurately positioned before bolt-ing with the aid of highly visible, col-ored guiding markers.
Metso said it designed the system to make removal and replacement of liners as quick, safe and easy as installation. Bolting and unbolting is straightfor-ward, as the threaded portion of the standard hex-head liner bolts is pro-tected from dust, corrosion and general mechanical damage. Once loosened, it is often possible to remove the liner bolts simply by hand-turning them. Pneumatic or recoilless hydraulic ham-mers are not needed to dislodge worn Megaliners, as gravity alone is general-ly sufficient.
The Megaliner is suitable for large AG mills with large trunnions and where modern liner handlers are available. Each Megaliner element integrates multiple lifter and shell plate rows, and covers an area up to 4 m 2 (43 ft 2 ). The rubber-and-metal composite liner weighs 30% to 60% less than metallic liners of a similar size.
Overall, said Metso, installing and replacing mill liners with the Megaliner system creates a much safer and less stressful environment for the liner han-dler operator and the installation team.