Method for identifying surface damage to a stone roll in the press part of a paper machine or the like

摘要

The invention relates to a method for identifying surface damage to a stone roll in the pressing part of a paper machine or the like. The stone roll is provided with a doctor (scraper) blade (8) which is arranged on a rotatable holder (7), extends over the length of the roll (3), and rubs on the surface of the roll (3). Blows on the scraper part (8) which are caused by surface damage to the roll (3) are recorded by means of acceleration pickups (9) arranged on the holder (7) in order to identify the surface damage to the stone roll during operation. A signal received by each transmitter (9) is summed in a fashion synchronised with the rotation of the roll (3). <IMAGE>