Conveyor belt system components and accessories specially adapted for use with conveyor belt systems, namely, conveyor belt cleaner assemblies and components thereof, comprised of replaceable blades and supports for affixing blades to a conveyor belt system frame for supporting blades relative to the belt, and holding fixtures and tensioning mechanisms for supporting the blades and supports relative to the conveyor belt, idlers, impact systems comprising idlers and impact saddles, conveyor belt bulk material containment assemblies comprising impact beds, roller beds, conveyor belt support cradles, idlers as part of conveyor belt assemblies, loading station tailpieces, and air stop box check systems comprising support housing and rubber baffle curtains for enclosing conveyor belts, skirt boards, rubber skirt board wear liners, skirt clamping assemblies to removably affix the wear liners to the skirt boards, conveyor belt tracking systems that maintain the belt in its correct position, comprised of guide rollers, supports for rotatably and removably affixing the guide rollers to the system frame, and supporting rollers relative to the belt, rubber, ceramic, and rubber-ceramic wear liners for chutes and loading areas of a conveyor belt system, chute access doors, chute heaters, and pulley coverings and laggings, namely, drum pulleys and strips of ceramic or rubber or ceramic with rubber