Vertical ball mill, stator segment for a vertical ball mill and method for maintaining a vertical ball mill

A self-supporting standing stator segment for a vertical ball mill, comprising:

• a wall that is approximately in a shape of a cylinder segment, within a shape tolerance;
• at least one sealing surface that is arranged on a side edge of the wall extending from a top edge of the wall to a bottom edge of the wall and is intended for sealing to another stator segment;
• and
• a standing surface that is arranged on the bottom edge and is dimensioned appropriately for a load, and by means of which the stator segment is erectable on a load-bearing surface of a base plate of the ball mill, so as to be orthogonal within an angular tolerance,
• wherein a stator is composed from a plurality of stator segments such that the stator stands in a self-supporting manner and comprises a lateral surface that is formed by the wall and is approximately cylindrical, within a shape tolerance, and wherein the stator, in an assembled state, stands in a loading manner on the base plate for supporting a weight of the stator.

A method for maintaining a vertical ball mill,

• wherein the vertical ball mill comprises a rotor that is axially and radially mounted at an upper end and hangs downwards, a stator which radially surrounds the rotor, is not loaded by a weight of the rotor, stands in a self-supporting manner, and has a lateral surface that is oriented tangentially to the rotor and is approximately cylindrical, within a shape tolerance, and a base plate that supports a weight of the stator,
• wherein the stator is composed of at least two stator segments which are separable from one another, stand unsupported in the separated state, and are movable relative to one another,
• wherein each of the stator segments comprises, on at least one side edge of a wall, extending from a top edge of the wall forming the lateral surface to a bottom edge of the wall, a sealing surface for sealing to the other stator segment in each case, and, on the bottom edge, a standing surface which is dimensioned appropriately for a load and is intended for sealing to the base plate,
• wherein the stator segment weighs, in a standing manner, on the base plate with the standing surface, in a manner orthogonal within an angular tolerance on a load-bearing surface of the base plate,
• wherein the method comprises:
• separating the stator into the stator segments, wherein a stator is separated at the sealing surfaces,
• arranging auxiliary devices under at least one of the stator segments, and
• lateral shifting of the stator segment and of the auxiliary devices using a shifting device.