Mechanical arm for hexagon nut installation

The utility model relates to a mechanical arm for hexagon nut installation, which comprises a multi-degree-of-freedom mechanical arm installed on a steel structure walking robot, and the multi-degree-of-freedom mechanical arm comprises a horizontal rotating unit, an angle adjusting unit, a rotating installation unit and a nut clamping unit. The horizontal rotating unit comprises a rotating frame, a rotating motor and a rotating platform, and the angle adjusting unit is connected above the rotating platform; the angle adjusting unit comprises a rotating flat plate, a balancing weight, a front arm and a driving system used for driving the front arm to deflect, and the front arm is connected with a rotating mounting unit; the rotary mounting unit comprises a mounting frame, a mounting motor and a mounting cylinder rotationally arranged in the mounting frame, and the lower end of the mounting cylinder is connected with the nut clamping unit; the nut clamping unit comprises a clamping base, a bidirectional lead sc