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NONDESTRUCTIVE TESTING APPARATUS FOR BLADE ROOT OF STEAM TURBINE OF POWER PLANT

  • US 20090151458A1
  • Filed: 12/13/2007
  • Published: 06/18/2009
  • Est. Priority Date: 12/13/2007
  • Status: Active Grant
First Claim
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1. A nondestructive testing apparatus for testing a blade root of a steam turbine installed in at least one of (a) a nuclear plant and (b) a thermal plant by using an ultrasonic probe, comprising:

  • an ultrasonic probe fixing unit configured to test the blade of the steam turbine; and

    an encoder fixing unit configured to record a rotation distance of a rotatable turbine rotor;

    wherein the ultrasonic fixing unit includes a first magnetic body switchably fixed to a fixture supporter, a first steel shaft fixed vertically to the first magnetic body, a second steel shaft connected to the first steel shaft through a first joint and having a three-dimensional degree of freedom to be rotatable and vertically movable, a contacting pressure controller mounted to the second steel shaft configured to maintain a predetermined pressure between the ultrasonic probe and the blade, the ultrasonic probe mounted to a leading end of the second steel shaft by the contacting pressure controller and a second joint to directly contact the turbine rotor; and

    wherein the encoder fixing unit includes a second magnetic body switchably fixed to the fixture supporter, a third steel shaft fixed vertically to the second magnetic body, a fourth steel shaft connected to the third steel shaft by a third joint and having a three-dimensional degree of freedom to be rotatable and vertically movable, and an encoder mounted to the fourth steel shaft rotatably to measure a rotation distance of the turbine rotor.

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