DEVICE MEASURING BOLT FORCE OF PLASTIC REGION TIGHTENING BOLT

摘要

The present invention relates to a plastic zone bolt plastic deformation region of the measured axial force in the bolt during tightening and small plastic zone to determine whether the ministry fastening plastic deformation occurs in the characteristics required bolt axial force that is self-volt system. The present invention relates to a axial force system for measuring the plastic deformation of the bolt occurs is fastened to the blood entered into the water, first the rosette-type strain gauge is formed by placing at 90 ° to the large diameter section outer surface adjacent to the head portion of the bolt 2 the consists of a circuit with four strain gages arranged in a 180 ° phase difference which the threaded portion of the first sensing unit and the bolt is formed to output a plastic deformation signal to determine whether the plastic deformation occurs in the bolts themselves small claim that comprises a circuit for the second rosette-type strain gauge is formed by a diameter section outer surface disposed 90 ° 2 dog with four strain gages arranged in a 180 ° phase difference between the output of the elastic deformation signal having the elastic characteristic of the bolt second detection unit, wherein the first, is connected to the second sensor line and the shield the shield through the through hole formed in the inner side of the bolt head of the bolt portion is discharged, It is connected to line and comprises a signal conditioning amplifier for amplifying a signal supplied from the first and second sensing units.