Roller groups for grinding devices, grinding devices, and methods

A milling apparatus (70), comprising a machine stand (71) and at least one roll assembly (10) with a first roll (11) and a second roll (12) that is or can be inserted in the machine stand (71),

• wherein the roll assembly has an integrated rolling device (30) having at least one roller (31) which is or can be arranged on the roll assembly (10) in such a way that the roll assembly can be placed onto a horizontal base and moved thereon by means of the at least one roller (31),
• wherein
• the machine stand (71) has at least one rail (72) on which the at least one roller (31) of the roll assembly (10) is movable during mounting and/or demounting of the roll assembly (10), the roll assembly (10) has at least one contact surface (42, 76) and the machine stand (71) has at least one counter-contact surface (73),
• wherein the contact surface (42, 76) and the counter-contact surface (73) are tailored to one another and to the at least one rail (72) in such a way that, in a mounted position of the roll assembly (10), by virtue of at least one form-fitting engagement between the at least one contact surface (42, 76) and the at least one counter-contact surface (73), the at least one roller (31) of the roll assembly (10) does not lie on the rail (72)), and wherein the roll assembly (10) has a force-measuring device that comprises:
• a first sensor (24) for directly or indirectly determining a first force with which the first bearing body (13) and the second bearing body (14) are pretensioned with respect to one another;
• and
• a second sensor (25) for directly or indirectly determining a second force with acts between the first abutment body (17) and the second abutment body (19).