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 at least one 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 automatically opening and automatically closing the aspiration opening, and the closure element is either designed and arranged in such a manner or is controllable in such a manner, that:
• the closure element is automatically located in an open position or automatically moves into an open position in which the closure element opens the aspiration opening when the pressure difference exceeds a threshold value,
• the closure element is automatically located in a closed position or automatically moves into a closed position in which the closure element closes the aspiration opening when the pressure difference undershoots the threshold value, and
• wherein the roller mill comprises at least one inspection opening, through which the grinding space is accessible, and also at least one grinding space door, with which the inspection opening can be opened or closed, the inspection opening, the grinding space door and the closure element are arranged and designed and matched to one another in such a manner that the pressure difference lies above the threshold value, when the grinding space door is closed, and lies below the threshold value, when the grinding space door is open.