Method and apparatus for determining cracks in a shaft by means of an
ultrasound pulse echo
    1.
    发明授权
    Method and apparatus for determining cracks in a shaft by means of an ultrasound pulse echo 失效
    用于通过超声波脉冲回波来确定轴中的裂纹的方法和装置

    公开(公告)号:US4893511A

    公开(公告)日:1990-01-16

    申请号:US233137

    申请日:1988-08-17

    IPC分类号: G01N29/04 G01N29/265

    CPC分类号: G01N29/265

    摘要: Method and apparatus for detecting cracks in a shaft by means of an ultrasound pulse echo method. A test hand having an ancillary wedge is coupled to the end face of the shaft for conducting nondestructive testing of the shaft. The test head emits ultrasound pulses of a determined frequency and is moved by means of a mechanical device in front of the end face. The method makes possible reliable and reproducible detection of cracks present at the circumference of long shafts. The test head delivers sound pulses in the range of 4 to 8 MHz and is placed by means of the device at a radial distance from the shaft end face's central axis. The test head is moved in the course of the measurements in three degrees of freedom; along a radius of the shaft, along a circle of the shaft and about the axis of the test head holder. The method and apparatus are employed for testing long turbine shafts in the assembled condition from the end face on the generator side of the shaft.

    摘要翻译: 通过超声脉冲回波法检测轴中的裂纹的方法和装置。 具有辅助楔的测试手连接到轴的端面,用于对轴进行非破坏性测试。 测试头发射确定频率的超声脉冲,并通过机械装置在端面前移动。 该方法可以可靠且可重复地检测长轴周围存在的裂缝。 测试头提供4至8 MHz范围内的声音脉冲,并通过设备与轴端面中心轴线径向距离放置。 测试头在三个自由度的测量过程中移动; 沿着轴的半径,沿着轴的圆周并且围绕测试头保持器的轴线。 该方法和装置用于在组装状态下从轴的发电机侧的端面测试长涡轮轴。