Automatic paint spraying and coating device for variable-diameter pipe joints

The utility model relates to an automatic paint spraying and coating device for a variable-diameter pipe joint. The paint spraying device is characterized in that the paint spraying device is composed of a front-end spraying unit (11), a paint storage stirring unit, a power unit and a rear-end walking unit which are sequentially connected, the paint storage stirring unit comprises a paint storage tank (10) with a built-in stirring blade (7), the power unit comprises a motor (8), and a first output shaft of the motor (8) is in transmission connection with a rotating shaft of the stirring blade (7); wherein the rear end walking unit comprises a rear cross-shaped support, walking wheels are installed at the four corners of the rear cross-shaped support, a transmission mechanism is installed on the rear cross-shaped support, and the transmission mechanism is in transmission connection with all the walking wheels and a second output shaft of the motor (8). The device solves the problems of more paint waste, poor s