The invention relates to a roller mill having at least one mill roller and a rotatable mill platen, which are arranged in a mill inner space, and a moment arm which is retained so as to be pivotably movable and rotationally secure in a bearing, with the mill roller being supported in a rotatable manner at one end of the moment arm and there further being provided means for applying a force to the moment arm comprising a pressure cylinder which is in operative contact with the moment arm in order to adjust the mill pressure which is applied by the mill roller. The contact location, at which the force of the pressure cylinder is transmitted to the moment arm, is located outside the mill inner space.
1. Roller mill having at least one mill roller ( 1 ) and a rotatable mill platen ( 2 ), which are arranged in a mill inner space ( 4 ), and a moment arm ( 5 ) which is retained so as to be pivotably movable and rotationally secure in a bearing ( 6 ), with the mill roller ( 1 ) being supported in a rotatable manner at one end of the moment arm and there further being provided means for applying a force to the moment arm which are in operative contact with the moment arm in order to adjust the pressure which is applied by the mill roller, the contact location ( 8 ), at which the force is transmitted to the moment arm ( 5 ) being located outside the mill inner space ( 4 ), wherein the means for applying the force to the moment arm comprise a pressure cylinder ( 7 ) which is in operative contact with the moment arm in order to adjust the pressure applied by the mill roller,
and in that there is provided between the pressure cylinder and the moment arm ( 5 ) at least one pressure bearing ( 10 ) which allows relative movement between the pressure cylinder ( 7 ) and the moment arm ( 5 ).
2. Roller mill according to claim 1 , characterised in that the pressure cylinder ( 7 ) acts on the moment arm ( 5 ) in a central region between the mill roller ( 1 ) and the bearing ( 6 ).
3. Roller mill according to claim 1 , characterised in that the pressure bearing ( 10 ) has a first and a second pressure face ( 10 a , 10 b ) in order to apply a sliding movement and a third and a fourth pressure face ( 10 c , 10 d ) in order to apply a pivoting movement.
4. Roller mill according to claim 1 , characterised in that the pressure bearing ( 10 ) has a first and a second pressure face ( 10 a , 10 b ) in order to which allows a sliding movement with a friction coefficient which is less than 0.2.
5. Roller mill according to claim 1 , characterised in that the pressure cylinder ( 7 ) is arranged so as to be fixed in position.
6. Roller mill according to claim 1 , characterised in that the pressure cylinder ( 7 ) is orientated perpendicularly relative to the connection between the bearing ( 6 ) and the mill roller ( 1 ).
7. Roller mill according to claim 1 , characterised in that the bearing ( 6 ) of the moment arm ( 5 ) is formed by an axial spherical plain bearing.
8. Roller mill according to claim 1 , characterised in that the moment arm ( 5 ) is constructed so as to be rectilinear.
9. Roller mill according to claim 1 , characterised in that the pressure cylinder ( 7 ) is formed by a plunger cylinder.
10. Roller mill according to claim 1 , characterised in that the relationship of the distance (a) between the pressure cylinder ( 7 ) and the milling roller ( 1 ) to the distance (b) between the pressure cylinder ( 7 ) and the bearing ( 6 ) of the moment arm ( 5 ) is in the order of 1:0.9 and 1:1.2, preferably in the order of 1:1.0 and 1:1.1.