Automatic paint brushing device and method for inner wall of steel pipe

The invention provides an automatic paint brushing device for the inner wall of a steel pipe, which comprises a truss manipulator, two elevators, a first bracket, a drum-type conveyor and a paint can, a lifting beam is arranged above the truss manipulator, a supporting plate is arranged at the bottom end of the lifting beam, and a plurality of electromagnets are sequentially connected to the bottom of the supporting plate from left to right; a third support, a second support and two racks are arranged on the surfaces of the two lifters respectively, a roller is arranged between the two racks, the two ends of the roller are connected with gear motors, a paint pump is arranged in the paint can, the output end of the paint pump is connected with a hose, one end of the hose is connected with a paint inlet pipe, and one end of the paint inlet pipe is connected with a paint brushing barrel. According to the automatic paint brushing device for the inner walls of the steel pipes, feeding, paint brushing and dischargi