Automatic coating method for oil tanks

The invention provides an automatic coating method for an oil tank. The method comprises following steps: position calibrating; fuel tank placing and moving, paint filling, paint receiving, blocking,transferring to roll painting position, clamp tool decreasing, clamping oil tank side walls, clamping oil tank flanges, a roll painting robot clamping returning; in the step of paint filling, after the paint filling nozzle is positioned over an oil tank paint filling port, a solenoid valve obtains signals to control a ball valve to open for paint filling; after a time preset by a time relay for paint filling, the ball valve is closed; in the step of paint rolling, the oil tank is held up in the air by the robot arm and swings in multiple directions and angles under the control of a preset program, wherein the time for swinging is 7 to 10 seconds. Its advantage is to realize the automatic production of paint coating on the inner wall of the fuel tank and greatly increase the production efficiency; the amount of ant