| 摘要 |
PURPOSE:To perform measurement continuously at high resolution, by fixing a gap sensor, which detects a gap between the sensor and an elongation-difference detecting end surface, to the other end of a tightening bolt, and measuring the stress elongation of the tightening bolt based on the output of the sensor. CONSTITUTION:A through hole 2 is provided at the central part of a tightening bolt 1. An elongation-difference detecting rod 3, whose base part is fixed to one end of the tightening bolt 1, is inserted into the through hole 2. A gap sensor 4a, which detects a gap between the sensor and the end surface of the elongation- difference detecting rod 3, is fixed to the other end part of the tightening bolt 1. The stress elongation of the tightening bolt 1 is measured based on the output of the gap sensor 4a. |
