| 摘要 |
An inner diameter measuring device, comprising a measurement carriage (2) traveled in straight direction, pipe holding frames (3, 4) disposed at front and rear positions with respect to advancing direction of the measurement carriage and for mounting a pipe to be measured (7), a measuring head (11) supported at a forward end of a supporting member (9) extended in a direction parallel to advancing direction of the measurement carriage, a first laser distance measuring unit (12) and a second laser distance measuring unit (13) disposed in traveling distance of the measurement carriage and for performing distance measurement in two directions perpendicularly crossing to each other, wherein the pipe holding frames can adjust a supporting position of the pipe to be measured as mounted in horizontal direction and in vertical direction, the measuring head measures an inner diameter of the pipe to be measured on condition that the measuring head is inserted in the pipe to be measured, reference outer peripheral surfaces being formed at least at two parts at front and rear positions on the pipe to be measured, the first laser distance measuring unit and the second laser distance measuring unit measure distance with respect to each of the reference outer peripheral surfaces at the two parts, and the supporting position of the pipe to be measured is adjusted by the pipe holding frames so that results of measurement by the first laser distance measuring unit and the second laser distance measuring unit at the two parts become minimum values. |
