Roller mill, aspirating assembly, and method for retrofitting a roller mill

A roller mill for grinding grinding material, said roller mill comprising:

• at least one grinding space in which the grinding material can be ground,
• at least one partition wall which separates the grinding space from an aspiration space,
• at least one aspiration opening which is formed in the partition wall and through which aspiration air can be drawn from the aspiration space into the grinding space on account of a pressure difference prevailing between the aspiration space and the grinding space,
• wherein the roller mill has at least one closure element for opening and closing the aspiration opening, and the closure element is designed and arranged and/or controllable in such a manner that:
• the closure element is located in an open position or moves into an open position in which the closure element opens the aspiration opening when the pressure difference exceeds a threshold value, and
• the closure element is located in a closed position or moves into a closed position in which the closure element closes the aspiration opening when the pressure difference undershoots the threshold value.

An aspirating assembly to be detachably connected to a frame of a roller mill, said roller mill comprising at least one grinding space, in which grinding material can be ground,

• wherein the aspirating assembly contains:
• at least one partition wall which separates the grinding space from an aspiration space,
• at least one aspiration opening which is formed in the partition wall and through which aspiration air can be drawn from the aspiration space into the grinding space on account of a pressure difference prevailing between the aspiration space and the grinding space,
• at least one closure element for opening and closing the aspiration opening, and the closure element is designed and arranged and/or controllable in such a manner that:
• the at least one closure element is located in an open position or moves into an open position in which the at least one closure element opens the aspiration opening when the pressure difference exceeds a threshold value, and
• the at least one closure element is located in a closed position or moves into a closed position in which the at least one closure element closes the aspiration opening when the pressure difference undershoots the threshold value.

A method for retrofitting an existing roller mill for grinding grinding material, wherein the existing roller mill contains at least one grinding space, in which the grinding material can be ground,

• wherein the method contains a step in which the following components are retrofitted such that a roller mill is obtained:
• at least one partition wall, which separates the grinding space from an aspiration space,
• at least one aspiration opening, which is formed in the partition wall and through which aspiration air can be drawn from the aspiration space into the grinding space on account of a pressure difference prevailing between the aspiration space and the grinding space,
• at least one closure element for opening and closing the aspiration opening, wherein the closure element is designed and arranged and/or controllable in such a manner that
• the at least one closure element is located in an open position or moves into an open position in which the at least one closure element opens the aspiration opening when the pressure difference undershoots a threshold value, and
• the at least one closure element is located in a closed position or moves into a closed position in which the at least one closure element closes the aspiration opening when the pressure difference exceeds the threshold value.