Metso has expanded its light-weight Poly-Met MegalinersTM, concept with the new MegalinerTM for mill heads. Like Metso‘s other MegalinersTM, this newest offering increases productivity in mills and makes maintenance and installation work safer than it is with traditional liners. Suitable for AG, SAG and ball mills, the easy-to-install MegalinerTM for mill heads is larger than conventional liners – and yet still light enough to be handled by the same 7- to 8-axis liner handlers (Fig.). Installation time is much faster as the liner has much fewer attachment points and the number of liner components is reduced by up to 80 %. The MegalinerTM is also less prone to cracking than other lining types commonly found in this kind of application. The MegalinerTM for mill heads minimizes the number of components to be installed by integrating multiple lifter and shell plate rows and providing the option to include filling segments. Fewer installation points speed up the installation and change-out process, as well. The reference installation of the MegalinerTM for mill heads on a 38‘ AG mill shows that installation time was reduced by 30 %, and there is potential for even further improvements.
Megaliner’sTM innovative attachment system improves worker safety during installation and change-outs; there is no need for workers to be in the danger-zone of the liners since the liner bolts are attached from the outside of the mill. The Metso Liner Positioning System allows the liner handler operator to act alone and position liners without the guidance of others inside the mill. Bright guiding markers make positioning and alignment even easier. Removal is also safer and quicker. The threaded portion of the standard hex-head liner bolt is protected 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 hammers are usually not needed for liner removal, as gravity helps to do the work.