Special-shaped nut marking and positioning device

The special-shaped nut marking and positioning device comprises a conveying belt device, a machine frame, an annular rotating base, a fixing base, a limiting module and a marking device, limiting blocking frames are symmetrically arranged on the two sides of the conveying belt device, a first pushing air cylinder is installed on the limiting blocking frame on one side, a plurality of positioning grooves are evenly formed in the annular rotating base, and a second pushing air cylinder is installed on the fixing base. Under the driving of a first pushing air cylinder, a special-shaped nut semi-finished product on the conveying belt device is pushed into a positioning groove in the annular rotating base through a first discharging through groove, a limiting module is installed on the side wall of the positioning groove, a lifting frame is arranged on the marking device, and a plurality of marking assemblies are installed below the lifting frame. And a second pushing air cylinder is mounted in the fixed seat. And