$46 Dual-Level Industrial Chain Conveyor System 3D model by machinexdesigns. Available on CGTrader. Check it out on CGHub.
SLDPRT (SolidWorks, filesize: 84.5 MB), STL (Stereolithography, filesize: 24.3 MB), X_T (Parasolid, filesize: 13.5 MB), OTHER (Other, filesize: 6.45 MB), STP (STEP, filesize: 9.71 MB), IGE (IGES, filesize: 12.6 MB)