Patent ID: 11938488
Assignee: METSO OUTOTEC USA INC.
Field: Chemical engineering (Chemistry)
Classification: CPC B | IPC B

Claim 15:
16. A roller crusher having two parallel rollers arranged to rotate in opposite directions, and separated by a gap, each roller having two ends, the roller crusher comprising:
a flange attached to one of the ends of one of the rollers,
the flange extending in a radial direction of the roller, and
the flange having an extension past an envelope surface of the roller, wherein the roller crusher further comprises a scraper device comprising:
a rotatable multi head scraper unit having at least two scrapers arranged tangentially about the rotatable multi head scraper unit at a respective radial distance from a rotational axis of the rotatable multi head scraper unit;
a rotation actuator arranged to selectively rotate the rotatable multi head scraper unit to allow operative use of one of the at least two scrapers at a time; and
at least one brake arrangement configured to prevent and/or restrict rotation of the rotatable multi head scraper unit during operation of the one of the at least two scrapers,

wherein the rotatable multi head scraper unit is arranged such that one of the at least two scrapers, by the rotation actuator, is selectively positionable at an end of a roller having a flange, and, by the at least one brake arrangement, is prevented and/or restricted to move relative to the roller to thereby at least partially allow removal of material accumulated on the flange and/or on the envelope surface at an end portion of the roller adjacent the flange.