Found arm over -and -under type arm

The utility model discloses a found arm over -and -under type arm, including unable adjustment base, upright arm, cantilever and (holding) chuck, the last roating seat that is provided with of unable adjustment base founds the arm and is connected with the roating seat through elevating gear, still is provided with the rotating electrical machines on the roating seat, be provided with the connecting axle on the cantilever, the connecting axle bottom is provided with the fixed plate, and the fixed plate bottom is provided with the rotation axis, is provided with the hydraulic pressure cylinder on the rotation axis, and the rotation axis bottom is connected with the (holding) chuck, it is provided with the stiffening beam to stand between arm and the cantilever. The utility model discloses a characteristics lie in: stack efficiently, the suitability is strong, and degree of automation is high, has practiced thrift a large amount of human costs, has guaranteed production efficiency and production safety.