Development of high accuracy torque standard machine in China

China's first torque standard device was established in 1977, developed by Shanghai Marine Equipment Research Institute, and its measuring range is 3000 N m. In 1987, Shanghai Marine Equipment Research Institute developed two torque standard devices, 30 kN m and 200 N m, and established China's first torque measurement and testing laboratory. Over the next 30 years, Shanghai Marine Equipment Research Institute and Chinese Academy of Metrology have developed 2000 N m automatic torque standard device, 20 kN m air bearing torque standard device, 50 kN·m lever torque standard device, 200 kN·m dead weight torque standard device, 200 kN m reference torque standard device, 100 N m negative step torque standard Device, 600 kN m reference dynamic torque standard device, standard torque wrench calibration device, 1 N·m torque standard device and so on. This paper introduces the principle, classification, structure, core components, range, accuracy and other indicators of China's current torque standard device, as well as the next step of China's torque standard to 5 MN m and 10 −8 N·m limit development needs, and finally will establish the full traceability chain of super torque and micro torque standards to meet the needs of China's ships, wind power and other super torque and micro machinery torque traceability.