| 摘要 |
An insert type supersonic crack hunting apparatus for hunting cracks generated in a boiler steel tube from its inside, is improved. In this apparatus, a crack hunting section provided with a probe, a slip ring for transmitting a supersonic signal issued from the probe, a rotary use motor for the crack hunting section and an axial feed motor for the crack hunting section are connected in sequence. An axial feed nut for converting rotation of the axial feed motor into movement in the axial direction is disposed between the rotary use motor and the axial feed motor. In addition, there is provided a coupling section, in which a front end of a flexible shaft connected to the axial feed motor is coupled to a rear end of a shaft connected to the axial feed nut. An axial feed shaft thrust bearing for supporting the coupling section, is disposed between the axial feed nut and the axial feed motor. Preferably, a geared shaft at the front end of the shaft having its rear end coupled to the flexible shaft connected to the axial feed motor, is threadedly inserted into the axial feed nut. |
