Variable-center-distance chain wheel transmission module

The utility model discloses a center-distance-variable chain wheel transmission module, and relates to the technical field of chain wheel transmission. The tensioning device comprises a middle supporting frame, a tensioning wheel installation assembly is fixedly installed on the rear side wall of the middle supporting frame through a fixing bolt, and a tensioning chain wheel is rotationally installed on the surface of the tensioning wheel installation assembly. Fixing between the middle supporting frame and the chain wheel support assemblies can be relieved through the adjusting bolts, so that the middle supporting frame and the chain wheel support assemblies can slide relatively, and the center distance between the driving chain wheel and the driven chain wheel can be adjusted by adjusting the distance between the two chain wheel support assemblies. After the center distance is adjusted to be proper, the chain wheel support assembly and the middle supporting frame are fixed through the adjusting bolt, the ch