Spraying system for interior of steel box girder

The utility model discloses a steel box girder interior spraying system which comprises a carrying mechanism used for carrying a sand blasting head and a paint spraying head into a steel box girder. And the sand supply assembly and the paint supply assembly are connected with the sand blasting head and the paint spraying head through pipelines correspondingly. According to the steel box girder interior spraying system, the carrying mechanism is adopted to enable the sand blasting head and the paint spraying head to enter the steel box girder, automatic sand blasting and paint spraying are achieved, and waste sand is automatically recycled. A closed space can be formed in the steel box girder in the spraying process, pollution to the surrounding environment is reduced, manual operation is avoided, the operation efficiency is improved, and the operation duration is prolonged. The industrial blank is filled, and the synchronous operation of automatic spraying and recycling of the steel grit can be realized. Orig