Patent ID: 6662630
Filing Date: 2003-12-16
Classification: D21G,F16C

Abstract:
A method for measuring slide bearing pressure in a deflection-compensated roll with a fixed shell, the roll having a stationary support structure and a shell rotatably mounted to the stationary support structure on a hydraulic slide bearings including a first main bearing element operating in a first direction defined by a nip plane, and a second main bearing element operating in a direction opposite to the first direction, wherein a control valve communicates with the first main bearing element and the second main bearing element, and a first pressure space for hydraulic fluid is located between the first main bearing element and the control valve, and a second pressure space for hydraulic fluid is located between the second main bearing element and the control valve, and wherein the shell is additionally supported on the support structure with a plurality of hydraulic loading devices, by which the profile of the shell in an axial direction is controllable, the method comprising the steps of:conducting hydraulic fluid from the first pressure space through a first measurement duct to a position outside the roll; conducting hydraulic fluid from the second pressure space through a second measurement duct to a position outside the roll; measuring the pressure of the hydraulic fluid at the first pressure space by a pressure sensor positioned in communication with the first measurement duct outside the roll; and measuring the pressure of the hydraulic fluid at the second pressure space by a pressure sensor positioned in communication with the second measurement duct outside the roll, wherein the slide bearings include a first side bearing element operating in a first transverse direction in a plane transverse to the nip plane and a second side bearing element operating in a direction opposite to the first transverse direction, and a second control valve is in communication with each of the first side bearing element and the second side bearing element, and wherein a third pressure space for hydraulic fluid is defined between the second control valve and the first side bearing element, and a fourth pressure space for hydraulic fluid is defined between the second control valve and the second side bearing element and wherein a third measurement duct extends from the third pressure space to a position outside the roll, and a fourth measurement duct extends from the fourth pressure space to a position outside the roll; conducting hydraulic fluid through the third measurement duct from the third pressure space to a pressure sensor outside the roll; and conducting hydraulic fluid through the fourth measurement duct from the fourth pressure space to a pressure sensor outside the roll, to thereby measure the pressure of the hydraulic fluid applied to the first side bearing element and the second side bearing element.