Concrete spray mechanical arm

The invention discloses a concrete spray mechanical arm, which mainly comprises a pivoting support, a large arm, a middle arm, a small arm, a small arm oscillating mechanism, a small arm parallel mechanism and a sprayer wrist gyrator. The pivoting support is arranged on a cement spraying machine frame; the large arm and the small arm are telescopic arms; an outer arm of the small arm is hinged with the middle arm; the sprayer wrist gyrator is arranged at the tail end of an inner arm of the small arm; the small arm parallel mechanism consists of two oil cylinders with the same cylinder diameter and rod diameter; the two oil cylinders are hinged with the pivoting support, an outer arm of the large arm, an inner arm of the large arm and the middle arm respectively; rod cavities are connected and rodless cavities are connected in the two oil cylinders; and the small arm oscillating mechanism consists of an oscillating oil cylinder, a tripod and a pull rod and is hinged with the middle arm and the small arm. The mechanical arm has the advantages of high working efficiency, high working quality and high adaptive capacity.