Support shaft bending gap and rigidity automatic measuring device and measuring method thereof

The invention discloses a support shaft bending gap and rigidity automatic measuring device and measuring method thereof. A tiny bending gap is magnified through a measuring rod, cylinders, matched with pneumatic sliding tables, serve as a power mechanism, the power mechanism is connected with and drives a pressure applying member to apply pressure to the measuring rod, displacement data and stress data of the measuring rod are collected in real time through displacement sensors and pressure sensors, and the bending gap angle and rigidity of a support shaft are further calculated. The support shaft bending gap and rigidity automatic measuring device and method realize accurate measurement of the bending gap through the two displacement sensors, and eliminate negative influence brought by radial play of a vertex of the bending gap relative to an axis when torque is input; the cylinders drive the pressure applying member to apply torque, thereby realizing continuous output of zero torque to specific torque; and measurement is highly automatic, personal error influence brought by different skill levels of operation personnel is avoided, the measurement accuracy is higher, a measuring process is high in degree of automation, requirements for skills of measurement personnel are low, repeatability and reliability are large, the operation is simple, and the efficiency is high.