Rolling assembly

A method for monitoring functionality of a safety device of a rolling assembly, the rolling assembly comprising:

• at least one roll pair with two cooperating rolls;
• and
• the safety device,
• wherein the safety device includes a hydraulic accumulator and a measuring device,
• wherein the hydraulic accumulator includes an accumulator with a first accumulator chamber and a second accumulator chamber,
• wherein a hydraulic fluid is disposed within the first accumulator chamber,
• wherein a compressible gas is disposed within the second accumulator chamber,
• wherein the hydraulic accumulator includes a moveably arranged separating member, which separates the first accumulator chamber from the second accumulator chamber in a sealed manner,
• wherein the roll pair has a working position and a safety position, wherein a radial distance between the rolls is larger in the safety position than in the working position,
• wherein the hydraulic accumulator is configured to have an effect on the roll pair to move the roll pair from the working position to the safety position, and
• wherein the measuring device is configured to continuously detect a position of the separating member within the hydraulic accumulator,
• wherein the method comprises:
• moving the separating member by changing a relative pressure between the first and second accumulator chambers;
• measuring a position of the separating member within the hydraulic accumulator and comparing the measured position of the separating member to a predetermined reference position of the separating member;
• and
• determining the functionality of the safety device from a deviation of the measured position from the predetermined reference position.