| 摘要 |
PURPOSE:To embody a control system in which operation can be easily done and the measuring accuracy is high by leaving measuring probes to be fitted during bolt axial force measurement by realizing multi-channel. CONSTITUTION:The title is provided with measuring probes 20 fitted on a plurality of bolts 14 and a bolt axial force measuring instrument 40 that sends an input electric signal to the probe 20 and measures the length of the bolt 14 based on the transmitted signal and its corresponded output electric signal of the probe 20 thereafter. Further, it is also provided with a channel selector 30 prepared between the instrument 40 and respective probes 20, by which the instrument 40 can be optionally connected with one of a plurality of measuring probes 20 and the connecting one probe can be changed successively, and a computer 50 that is connected with the instrument 40 and calculates the elongation of the bolt 14 based on the difference of bolt axial force measured values before and after tightening the bolt 14. |
