Calibration system for torsion angle based on photoelectric shaft encoder

WANG Gui-yong1,2, ZHU Lin-mao1,2, ZHU Tie-zhu1,2, YANG Dong2, WANG Zeng-guang2, WANG Peng1,2, WANG Hai-zhou1
(1.Central Iron & Steel Research Institute, Beijing 100081,China;
2.NCS Testing Technology Co., LTD., Beijing 100081, China)

Abstract: Aiming at lacking of effective, reliable and full-scale torsion angle calibration device for calibration of torsion angle of the active rotating clamp of torsion testing machine which was needed to be calibrated regularly, the structure and working principle of the torsion testing machine were researched, and a calibration system for torsion angle based on photoelectric shaft encoder was proposed. The structure of the calibration system was designed, and its workflow was established, and the calibration system for torsion angle based on photoelectric shaft encoder was built. The torsion angle of torsion testing machine was calibrated by using the calibration system. The calibration result was evaluated for its uncertainty. And the relative error calculation and the repeatability calculation were also carried out for the calibration result. The results indicate that the calibration system for torsion angle has the characteristics of simple structure, convenient operation and stable performance, which can not only meet the measurement requirement of torsion angle in JJG269-2006 Torsion Testing Machine Verification Regulations, but also provide a reference for the development and construction of calibration device for the torsion angle of torsion testing machine with higher accuracy and higher efficiency.
Key words: photoelectric shaft encoder; torsion testing machine; torsion angle; calibration system