Stud inspection system

• US 4,481,814 A
• Filed: 06/28/1982
• Issued: 11/13/1984
• Est. Priority Date: 06/28/1982
• Status: Expired due to Fees

• Current Assignee: Combustion Engineering Incorporated (ABB Limited)
• Original Assignee: Combustion Engineering Incorporated (ABB Limited)
• Inventors: Wentzell, Timothy H.
• Primary Examiner(s): Swisher, S. Clement
• Assistant Examiner(s): Noland, Tom
• Application Number:
  US06/392,844
• Time in Patent Office: 869 Days
• Field of Search: 73/432 B, 73/168, 73/432 R, 33/178 E, 33/178 F, 33/178 R, 33/302, 376/249, 376/258
• US Class Current: 73/866.5
• CPC Class Codes: F16H 37/16 with a driving or driven member which both rotates or oscillates on its axis and reciprocates
• CPC Class Codes: F16H 55/02 Toothed members; Worms
• CPC Class Codes: F16H 55/26 Racks
• CPC Class Codes: G21C 17/017 Inspection or maintenance of pipe-lines or tubes in nuclear installations
• CPC Class Codes: Y02E 30/30 Nuclear fission reactors

Abstract

An elongated stud has an axial bore down which an inspection probe is rotated and translated on the end of a shaft which is moved through gearing with a pair of motors. Encoders on the motors coordinate the signal from the probe at a single station which manifests the sensed conditions of the stud at positions within the bore.

Claims

1. In a system for positioning a sensing element within a bore and having a remote station at which the sensing element within the bore manifests the conditions sensed at specific locations within the bore, including,

a shaft mounted to extend its lower end vertically down the bore whose body is to be inspected,

a single set of gear teeth mounted on the external surface of the shaft through which both rotation and translation of the shaft is carried out,

said sensing element comprising a transducer used as a probe mounted on the lower end of the shaft to sense body conditions,

a first motor having a first gear mounted to horizontally engage the teeth on the external surface of the shaft for rotating the shaft,

a second motor having a second gear mounted to vertically engage the teeth on the external surface of the shaft to translate the shaft axially,

encoders connected to both motors to register the rotation of the motors as the position of the transducer within the bore,

and the station connected to the transducer and encoders to manifest the location of conditions sensed by the transducer within the bore.

2. A system for positioning a primary element within a vertically oriented bore, including,

an elongated shaft member arranged to extend its lower end into the bore,

a primary element mounted on the lower end of the shaft member,

teeth formed on the external cylindrical surface of the shaft member in the form of truncated pyramids with their bases mounted on the external surface and arranged in parallel vertical rows and parallel horizontal rows,

a first gear mounted on an axis parallel with the shaft axis and its teeth on its periphery engaged with the teeth on the shaft so as to bear upon the shaft teeth horizontally,

a first motor mounted to rotate the first gear for rotating the shaft to any predetermined position,

a second gear mounted with its axis at right angles to the vertical axis of the shaft member and with its peripheral teeth engaged with the teeth on the external surface of the shaft member to bear upon the teeth of the shaft in vertical directions to position the shaft vertically,

a second motor connected to the second gear to position the shaft vertically to predetermined positions,

and a control station connected to the primary element on the end of the shaft to manifest conditions surrounding the bore to which the primary element responds at the positions predetermined by operation of the two motors.

3. The system of claim 2, including,

a first encoder for the first motor,

a second encoder for the second motor,

and means connecting both encoders to the station in order to combine the output of the encoders with the primary element signal to manifest the bore location and conditions surrounding the bore sensed by the primary element.

4. The system of claim 3, in which, teeth on the external surface of the shaft are in the form of truncated four-sided pyramids based on the shaft surface and arranged to form parallel rows vertically and horizontally for engagement by the teeth of the two gears.

5. The system for reciprocating and rotating a primary sensing element, including,

having the primary element be of a kind which detects a condition in an elongated path as the element is reciprocated along the path and rotated at predetermined positions in the path,

a shaft attached to the primary element and extending axially along the path,

a first set of gear teeth formed to protrude from a cylindrical surface on the shaft and arranged in vertical rows and horizontal rings,

a first gear mounted such that its axis is parallel to the path,

a second set of teeth mounted on the periphery of the first gear engaging the first set of teeth horizontally as the gear rotates,

a second gear mounted with its axis spaced from the path and extending at right angles to the path,

a third set of teeth mounted on the periphery of the second gear engaging the first set of teeth vertically as the gear rotates,

and means rotating the gears separately and selectively to reciprocate the shaft along the path and rotate the shaft at any predetermined position in the path.

6. The system of claim 5, wherein,

the parallel vertically extended teeth of the second set and the first set of teeth are arranged in vertical rows between which the teeth of the second set travel as the shaft is reciprocated.

7. The system of claim 5, wherein,

the substantially horizontally extended teeth of the third set are arranged to travel between the horizontal rings of the first set when the shaft is rotated.

8. The system of claim 5, wherein,

the first set of teeth are in the form of truncated four-sided pyramids with the base of each tooth mounted on the cylindrical surface of the shaft.