Apparatus for automated positioning of eddy current test probe
View Patent ↗An apparatus for automated inspection and repair of a tube sheet. The apparatus has a rotating gripper pod, comprising at least one tube gripper, a sliding body portion containing the gripper pod; a housing portion comprising at least one tube gripper and a tool head coupling. The tool head coupling swapably attaches to a eddy current test probe and at least one kind of tube repair tool. Novel, auto-locking tube grippers are also disclosed. A serial bus connects electronic modules within the apparatus and also connects the apparatus to an external controller.
1. An apparatus for automated inspection and testing of a tube sheet wherein the tube sheet has a plurality of tube openings arranged on a tube sheet plane, the apparatus comprising:
a sliding body portion comprising:
a rotating gripper pod with three tube grippers; and
a tool head coupling hingedly mounted to said sliding body portion;
left and right outer housings;
each outer housing comprising one or more tube grippers;
wherein said sliding body portion is arranged between said left and right outer housings, and wherein said sliding body portion, including said rotating gripper pod, and said left and right outer housings have top surfaces aligned on a common plane which, when the apparatus is in use, is parallel to said tube sheet plane, and wherein said tube grippers emerge from said rotating gripper pod and left and right outer housings, respectively, perpendicular to said common plane, and
wherein said left and right outer housings move with respect to said sliding body portion such that said top surfaces remain in said common plane.
2. The apparatus of claim 1 , wherein each of said tube grippers comprises
gripper shoes;
wherein said gripper shoes have a shoe face and an inner surface and said tube gripper further comprises an inclined surface, and a friction reduction element, wherein said friction reduction element reduces the friction between said gripper shoe inner surface and said inclined surface such that less force is required to slide said gripper shoe along said inclined surface than is required to slide said shoe face against said tube wall.
3. The apparatus of claim 1 , wherein when at least two of said rotating gripper pod tube grippers are locked into tubes and none of said outer housing tube grippers are inserted into tubes, the rotating gripper pod can be actuated to rotate the apparatus about an axis that is perpendicular to said tube sheet plane.
4. The apparatus of claim 1 , wherein when at least two of said rotating gripper pod tube grippers are locked into tubes and none of said outer housing tube grippers are inserted into tubes, said outer housing tube grippers can be actuated to move said outer housings across the tube sheet parallel to said tube sheet plane.
5. The apparatus of claim 1 , wherein when at least two of said outer housing tube grippers are locked into tubes and none of said rotating gripper pod tube grippers are inserted into tubes, said outer housing tube grippers can be actuated to move said sliding body portion across said tube sheet parallel to said tube sheet plane.