H4-DH18A n be obtained from the respective manufacturer Te Helical gear Reduction Box H4

Flender/Flender Gear Units/Helical gear Reduction Box H4

ilter or is sent back for further grinding, via the grid cone onto the grinding table. Lumps, which escape the rollers and are too heavy to rise with the gas flow drop through the louvre ring to reject system and are then fed back via the reject system. Raw mills or coal mills operate using the same size of rollers. What is particular for Loesche cement mills is the 2+2 or 3+3 system, which features combination of different sizes of rollers. In cement Water and energy are precious resources and without them life would not be as we know it today. Both commodities will become more expensive and scarcer in the future. Consequently, saving energy and water is essential for ecologically- and economically-viable production, particularly in the cement industry.by Dr Daniel Strohmeyer, Loesche GmbH, Germany IStandalone VRMs without HGG Figure 1: Loesche vertical roller mill for cement grinding material flow, feed materials and products Figure 2: grinding plant flowsheetmills, Loesche has support roller and master roller. The roller is solely to prepare and stabilise the grinding bed. The most difficult thing to achieve when producing cement is to keep the grinding bed stable. In comparison to raw material grinding, with cement milling there are more fines and some parts of the grinding bed tend to become partly fluidised, caused by entrapped air. This reduces the internal friction within the material layer making it difficult to efficiently apply the grinding forces. So the roller removes the air from the grinding bed and prepares the material for the master roller to carry out the grinding. The flowsheet for grinding system with VRM (see Figure shows that, after the classifier, product is precipitated and then recovered from the bag filter. system fan provides the draft through the machine and different sources of hot gases can be utilized if required. Furthermore wide range of feed materials are tolerated and conveyed to the mill via the feeding syste