| 摘要 |
PURPOSE:To measure the curvature of a tube on on-line basis from the difference between the maximum and minimum value of the isolation distance between the outer peripheral surface of the tube and a reference position by detecting the isolation distance while rotating the tube in a circumferential direction. CONSTITUTION:The center of the pipe P between places where it is supported by supporting devices S is invariably on center lines of the devices, so when the pipe P which has curvature is rotated by rotating rolls R in a circumferential direction, the center of the pipe P runs on the axial line of a distance detector when the pipe P comes closest to and farthest from the distance detector D. Namely, the detector D is arranged right above the center point of the beam part of the pipe P or at >=2 optional positions in the lengthwise direction of the beam part to detect the distance to the upper end of the outer peripheral surface and obtain the maximum and minimum values, calculating the curvature of the pipe P. Thus, the curvature is measured on on-line basis in a manufacture line of a seam welded pipe, etc. |
