High-pressure grinding rollers
The movement of the floating roller is based on the principle of high-pressure comminution with a roller press. In HPGRs, the roller gap adjusts itself automatically when subjected to a given pressure between the rollers. The extent of the roller movement at the gap is a function of the stiffness of the hydraulic system in relation to the reaction forces exerted by the processed material, and therefore varies accordingly. This design feature guarantees that during the comminution process, all the feed material passes through the roller gap under the same process conditions, thus ensuring that the HPGR output quality remains constant.