Rotary-disk large-surface measuring device

The utility model relates to a rotary-disk large-surface measuring device, which relates to a detecting device of the disk surface flatness of the rotary disk of a numerically-controlled turret punching machine. The rotary-disk large-surface measuring device is portable and concise, has simple operation and can precisely obtain data. The rotary disk is provided with a middle hole, a stepped hole is arranged at the opening of the middle hole facing towards the large surface of the rotary disk, the bottom surface of the stepped hole is vertical to the middle hole, and the measuring device comprises a mandrel, a rotary handle, a cantilever rod, a vertical rod, a balancing weight and a dial indicator; the mandrel is provided with an outer cylindrical surface in clearance fit with the stepped hole, and the lower end surface of the mandrel is contacted with the bottom surface of the stepped hole; the rotary handle and the cantilever rod are oppositely and fixedly connected onto the lateral surface of the mandrel and positioned on the same diameter line of the mandrel; the balancing weight is movably connected onto the rotary handle and can axially move along the rotary handle; and the vertical rod is adjustably connected at the far end of the cantilever rod, the dial indicator is adjustably connected at the lower end of the vertical rod, and the detection head of the dial indicator corresponds to the disk edge of the large surface of the rotary disk. A large disk does not need to be moved, and the detecting operation working is portable.