|Storage Silo Components|
The Astec drag conveyor is tough. Formed from steel and lined with Ni-Hard, it is made to withstand the demands of asphalt production.
Tough Roller Chains Hold Thick Slats
The drag conveyor reaches from the mixer exit chute to the top of the silos. Strong, wear resistant, 6-inch roller chain runs from bottom to top, with 3/4-inch thick, 7-inch deep, steel, horizontal flights attached every 12 inches. This tough chain has an ultimate strength of 140,000 lbs and rollers hardened to Rockwell 57.
Astec Drag Chains Ride Smoothly
With wide idlers the flights don't skim or "hydroplane" over the mix. Mounted on floating hold-down bearings, these idlers also support the return portion of the chain and minimize vibration. As a result there is less wear to the sprockets, liners, and chain. Floating hold-down bearings have grease piping that lets you lube them from both sides of the conveyor stair.
We Give You Segmented Sprockets
The drag chain rides on segmented sprockets located at the head and tail shafts. Induction hardening to Rockwell C60 gives the sprockets a uniform, deeply hardened wear surface.
Each sprocket bolts to a split hub. You can replace the sprocket one piece at a time without removing the chain, which drastically reduces the time and effort required. The bottom sprocket is adjustable so the drag chain can be tightened.
Astec Drag Conveyors are Unmatched
The top sprocket is located a good distance above the conveyor discharge. This, plus the 9° backward slope of the flights, makes sure that flights are completely discharged by the time they reach the top sprocket. No mix residue is dropped on the sprocket, so the sprocket and chain last much longer.
Liner and Chain Warranty
Astec lines the bottom and sides of the conveyor with abrasion resistant liners. The liners are guaranteed to 2,000,000-tons of mix and a 750,000-ton prorated chain warranty.
Traverse Conveyors Load Batchers
The drag conveyor discharges into the traverse conveyor installed atop batchers. The operator selects the silo to be filled, and the traverse empties its contents into the designated silo's batcher.