Adjustable eddy current probe fixing mechanism used for detecting central hole of turbine rotor

Abstract

The invention relates to an adjustable eddy current probe fixing mechanism used for detecting a central hole of a turbine rotor. The mechanism comprises a probe sleeve with a closed axial end, and a guide rod sleeve with a closed axial end, wherein a scale plate extending outwards is arranged at the closed end of the probe sleeve in a radial direction, a guide groove is arranged in the middle of the scale plate, and a probe bolt hole is respectively arranged at each of the two sides of the probe sleeve in the radial direction; a screwed connecting piece is arranged at the central position of the closed end of the guide rod sleeve, and a guide rod bolt hole is respectively arranged at each of the two sides of the guide rod sleeve in the radial direction; and the guide rod sleeve is arranged by the screwed connecting piece on the scale plate through the matching between the screwed connecting piece and the guide groove and positioned outside the closed end of the probe sleeve. According to the adjustable eddy current probe fixing mechanism, the design is reasonable, the size of the original probe does not need to be changed, the inspection cost is saved; an eddy current probe is fixed at the probe sleeve end, and a telescopic guide rod is installed at the guide rod sleeve end; and when the adjustable eddy current probe fixing mechanism is used for detecting, the turning radius of the detecting surface of the probe can be adjusted flexibly according to the size of the inner diameter of the central hole of a detected rotor, and the defecting efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of detecting the center hole of a steam turbine rotor in a power plant, and in particular relates to a mechanism for fixing a probe when detecting the center hole of a steam turbine rotor. Background technique [0002] At present, custom-made probes are used for eddy current detection probes for the center hole detection of steam turbine rotors in power plants. During the inspection, the outer diameter of the probe is customized according to the inner diameter of the center hole of the rotor to be inspected. According to the depth of the center hole to be inspected, the probe needs to be fixed on a telescopic guide rod with adjustable length. In practice, the inner diameter of the center hole of different types of steam turbine rotors is different, and each unit needs to customize the probe separately for inspection, which increases the inspection cost; and the inner diameter of the center hole of many steam...

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Problems solved by technology

[0003] In order to solve the problem that a variety of probes of different specifications need to be equipped for the inspection of the steam turbine unit in a power plant and the inspection cost is high, the invention reforms the probe fixing mechanism to provide an adjustable eddy current probe fixing mechanism for the detection of the center hole of the steam turbine rotor with high detection efficiency

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