METHOD FOR RECONDITIONING A USED GRINDING ROLL
The invention relates to a method for reconditioning a used grinding roll of a high-pressure bed grinding mill. In said method, the surface of the rolling body is turned by a certain degree after removing the worn profiled members, whereupon the existing bores can be deepened to a depth that is sufficient for receiving new profiled members or new bores can be created according to a new bore pattern. New profiled members are then inserted into the bores. The inventive method allows a used grinding roll to be reconditioned in a particularly time-saving manner while economizing material.
1 . Method for reconditioning a used grinding roller of a high-pressure material bed roller mill, containing a plurality of profile-members which are embedded in holes of the roller body with a portion of the length thereof and, with the remainder of the length thereof, project above the surface of the roller body, the profile-members having greater hardness than the surface of the roller body and the projecting portion of the profile-members and the surface of the roller body being at least partially worn,
characterized in that, after the worn profile-members have been removed, the worn surface of the roller body is turned at least in a part-region of the width of the roller body as far as a diameter which is greater than the diameter of the base of the holes provided, after which
a) the holes provided are extended as far as a depth which is sufficient to receive new profile-members,
b) and/or new holes are produced in accordance with a new hole configuration,
c) and/or shorter profile-members are introduced into the holes which are now shorter.
2 . Method according to claim 1 , characterized in that, after the worn surface has been turned, shorter profile-members and a spacer mass which is supported on the hole base and which acts as a longitudinal compensation means are introduced into the holes which are now shorter.
3 . Method according to claim 1 , characterized in that, before the holes are extended, counter-sinking of the holes is carried out.
4 . Grinding roller of a high-pressure material bed roller mill, containing a plurality of profile-members which are embedded in holes of the roller body with a portion of the length thereof and, with the remainder of the length thereof, project above the surface of the roller body,
characterized in that
a) the holes have, in the new state of the grinding roller, a depth which is substantially greater than the minimum depth necessary for securely retaining profile-members, with the space between the profile-members and the base of the holes being filled by a spacer or pressure mass until the first reconditioning of the grinding roller,
b) and in that, in the reconditioned state of the worn roller body, the spacer or pressure mass is removed and new profile-members are introduced into the holes.