Device for measuring width of closed T-shaped narrow ring groove of integral blade ring

A device for measuring the width of a closed T-shaped narrow ring groove of an integral blade ring comprises a shell, a spring, a movable measuring head and a dial indicator, a fixed measuring head is arranged at the lower end of the shell, a cylindrical hole is formed in the shell, and the movable measuring head and the spring are installed in the cylindrical hole formed in the shell together after the movable measuring head is sleeved with the spring; the movable measuring head can slide along a cylindrical hole formed in the shell, the lower end of the movable measuring head is fixedly connected with a measuring needle, and the measuring needle and the fixed measuring head are located on the same plane and protrude outwards respectively; and the mobile measuring end of the dial indicator is abutted against the mobile measuring head. According to the device, a comparison measurement method is used, the size can be directly measured, a standard block used for comparison is regularly sent to a measuring unit