Dust falling structure with adjustable range for concrete processing

The utility model discloses a concrete processing range adjustable dust falling structure which comprises a dust falling pipe, a threaded rod is arranged on the outer wall of the dust falling pipe, a movably connected threaded sleeve is arranged on the outer wall of the threaded rod in a matched mode, a first gear is arranged on the outer wall of the threaded sleeve in a sleeved mode, and a movably connected supporting frame is arranged on the outer wall of the first gear. A transmission assembly meshed with the first gear is arranged at the top of the supporting frame, a second gear movably connected with the outer wall of the supporting frame is arranged on the outer wall of the supporting frame and movably connected with the transmission assembly, a driving assembly is arranged at the bottom of the supporting frame, four arc-shaped connecting plates are arranged at the top of the driving assembly, and racks meshed with the second gear are arranged on the outer walls of the arc-shaped connecting plates. And