The invention provides a spraying
robot mechanical arm with five freedom degrees. A base box is included, and an upper end port of the base box is closed for covering through a box cover bearing pedestal; a rotating disk is rotationally supported on the middle portion of the box cover bearing pedestal; the base box is provided with a driving motor and a speed
reducer; the output end of the drivingmotor is connected with the input end of the speed
reducer; the output end of the speed
reducer is connected with the rotating disk; a lower arm joint is vertically fixed to the upper end face of therotating disk; the upper end of the lower arm joint is hinged to the lower end of a middle arm joint; an upper arm joint used for installing a spraying device is hinged to the upper end of the middlearm joint; a first
hydraulic cylinder is hinged to one side of the lower portion of the lower arm joint; the top end of a
piston rod of the first
hydraulic cylinder is hinged to one side of the middle portion of the middle arm joint; a second
hydraulic cylinder is hinged to the other side of the middle portion of the middle arm joint; and the top end of a
piston rod of the second hydraulic cylinder is hinged to the upper arm joint. According to the spraying
robot mechanical arm with the five freedom degrees, the rotating disk is driven by a stepping motor, in combination with large-angle rotating formed by the structures of the upper, middle and lower three arm joints, the rotating freedom degree of the mechanical arm is improved, rotating of the spraying
robot mechanical arm in all directions is flexible, using is flexible and convenient, and the
automation degree is high.