Mechanical clamping arm

The utility model discloses a mechanical clamping arm which comprises a first shell, gears are rotatably connected to the two ends in the first shell, clamping jaws are connected to the shaft portions of the gears, and the clamping jaws extend out of the first shell; the first shell is communicated with one end of the second shell, limiting grooves are formed in the two side walls in the second shell, limiting blocks are connected to the two sides of one end of the driving shaft, the limiting blocks are slidably connected with the limiting grooves, the other end of the driving shaft extends into the first shell, racks are arranged on the two side walls of the driving shaft, and the gear is meshed with the racks; the first motor is arranged in the second shell and connected with a first rotating shaft, threads are arranged on the outer surface of the first rotating shaft, a screw hole is formed in the middle of the driving shaft, and the first rotating shaft is in threaded connection with the driving shaft. Th