| 摘要 |
PURPOSE:To perform the rotation of a ring around a bolt making a distance constant after once positioning a probe by inserting the head of the bolt in the ring connected to one end of the extensible variable shaft having the probe provided to the other end thereof. CONSTITUTION:The ring 5a in which the head of a bolt 3 is inserted is connected to one end of an extensible variable shaft 5 and a probe 1 detecting the crack around the bolt 3 is provided to the other end of the shaft 5 and the oscilloscope 9 connected to the probe 1 displays the crack. At first, the length of the shaft 5 is controlled so as to set the interval between the probe 1 and the bolt 3 to predetermined length. After this setting, the head of the bolt 3 is inserted in the ring 5a and the shaft 5 is rotated so as to go round the head of the bolt 3. The output signal of the probe 1 is inputted to the oscilloscope 9 with the detection of a flow to be displayed thereon. |
