Roller press with annular disc
A roller press ( 1 ) is described for grinding particulate material such as cement raw materials, cement clinker and similar materials, the roller press having two oppositely rotating rollers ( 2, 3 ) with one roller being movably supported relative to the other roller and with the rollers ( 2, 3 ) forming between them a roller gap ( 4 ). A co-rotating annular disc is attached to one of the rollers ( 2 ), which subject to actuation by a number of springs ( 7 ), is movable in the direction of the roller axis and which, in the area around the roller gap ( 4 ,) extends over the end surface ( 3 a ) of the other roller. The annular disc is divided into a number of ring sectors ( 5 ) over its circumference, each individually biased by springs towards the end surface ( 3 a ) of the other roller ( 3 ). Hence, it is possible to maintain the grinding bed thickness at the ends of the rollers, thereby attaining a uniform pressure distribution across the rollers, as well as uniform grinding efficiency and uniform wear on the rollers.
1. A roller press for grinding of particulate material such as cement raw materials, cement clinker and similar materials, said roller press comprising:
first and second oppositely rotating rollers, one of said first and second rollers mounted so as to be movable relative to the other of the first and second rollers, said rollers forming a roller gap therebetween;
a plurality of springs; and
a co-rotating annular disc, attached to one of said first and second rollers, said annular disc subject to actuation by said springs and mounted so as to be movable in the direction of a roller axis, said annular disc extending over an end surface the other of said first and second said rollers proximate the roller gap, wherein said annular disc comprises a number of ring sectors around its circumference, said ring sectors individually biased by one or more of said springs towards the end surface.
2. A roller press according to claim 1 wherein each said ring sector comprises an end stop to limit the axial movement of said ring sector in the direction towards the end surface.
3. A roller press according to claim 2 wherein said end stop comprises a number of studs attached to said ring sector.
4. A roller press according to claim 2 wherein said end stop is adjustable.
5. A roller press according to claim 2 wherein said end stop comprises a number of adjustable screws fitted within through-going threaded holes formed in said ring sector.
6. A roller press according to claim 1 wherein said ring sectors are fitted on the second of said rollers.
7. A roller press according to claim 6 wherein the second of said rollers is unmovable.