Accurate alignment tank car truss type crane tube loading and unloading closed cover plate device

The invention relates to an accurate alignment tank car truss type crane tube loading and unloading closed cover plate device. The truss type crane tube loading and unloading device can move a crane tube to achieve accurate alignment in a three-dimensional manner, the oil gas recovery amount is further improved, two sets of air bags in different sizes can be arranged on the closed cover plate device, and parts capable of forming sealing with a tank opening are also different in size; and the structure is suitable for tank openings with different diameters, limitation of the specification of the tank car is avoided, and the adaptability is better. Fixed structures of the air bags are improved, so that the air bags are disassembled and replaced more conveniently and rapidly, the structure is simpler, the device cost is reduced, the accurate alignment tank car truss type crane tube loading and unloading closed cover plate device can be used under various working conditions, the air recovery rate is effectively i