Patent ID: 9010404
Filing Date: 2015-04-21
Classification: F22B,G01N,Y10T

Abstract:
1. A heat transfer tube inspection apparatus provided in a fixed unit to be fixed to a tube plate surface of a tube plate at which a heat transfer tube is opened, for inspecting a seal-welded portion at which the heat transfer tube is welded to the tube plate, the inspection apparatus comprising: an inserting unit to be inserted into and withdrawn from the heat transfer tube; a detecting unit for detecting a presence or absence of a defect at the seal-welded portion; a rotating mechanism for rotating the detecting unit around a central axis of the inserting unit; and a moving mechanism for moving, with respect to the fixed unit, the inserting unit, the detecting unit, and the rotating mechanism along the central axis for the rotation of the detecting unit; wherein the inserting unit includes a fixing mechanism that fixes the inserting unit inside the heat transfer tube and a contact member that is pressed against an inner surface of the transfer tube, the fixing mechanism includes an actuator and a movable member that is disposed inside the contact member and is moved in a direction perpendicular to the central axis by the actuator, the inserting unit further includes a bearing between the contact member and the movable member to allow the contact member and the movable member to mutually rotate about the central axis.