Roller Chain Conveyors

Roller chains are usually thought of as being mostly for drives, while rargmeoing steel chains are used for conveyors and bucket elevators, but there are many exceptions. In fact, thrae are aiough exceptions that a chapter in the drives section covers heavy-duty offset sidebar raigineering steel chain drives and another chapter in the conveyors section covers roller chain conveyors. Both are the subject of ASME standards. 

The conveyor length is 78 ft. That is quite long for a roller chain conveyor, so the chain will roll in guide tracks on both the conveying and return runs. 

The number of speed reduetions is another way to classify conveyor drives. Most common of the speed-reduction methods is the two-step system, in which the motor is coupled to a speed reducer and the slow-speed shaft of the reducer is connected to the conveyor-drive shaft by a V belt or a roller chain. The second reduction not only permits the use of a simpler speed reducer but also allows a more flexible layout of the motor and reducer mounting plate. On many installations this eliminates the need for a specially designed drive mount. 

Roller conveyors are quite frequently powered, the simplest method being use of a pressure belt in contact with the lower surface of the rolls. A special ripple belt with raised pads is capable of starting up the load but does not build up excessive blocked pressure if the line fills up. Other similar drives are available, with varying degrees of control over the applied power. Most expensive of the powered roller units are those in which each roll is equipped with V-belt or chain drives. Pusher bars suspended from overhead chain conveyors may also be used to move containers along a roller hne. 

Chain Conveyors These devices for handling containers are available in either roller-chain designs or less costly types. There is a variety of slat conveyors that use both single and double strands of roller chain, as well as a slider type using cheaper chain. In general, slat chain conveyors are used only on loads which are too heavy for economical handling by belt, roller, or wheel units or which have odd shapes not suitable for roller or wheel units. They are particularly adaptable to pallet handhng, as are simple open strands of chain with flat-surfaced attachments. 

Roller Chains. These chains are primarily selected for low and medium-speed service and for conveyor work, although roller chains are sometimes used for higher speeds because they operate more smoothly and quietly. 

Type 1 malleable-iron conveyor flights type 2 steel flights on roller chain type 3 steel flights with wear shoes or rollers type 4 steel flights on plain chain. 

Material handling, 1502-1525 automated systems for, 500, 1524-1525 in automated test and inspection, 1902 and containerization, 1503 conveyors for, 1513-1520 belt conveyors, 1513, 1514, 1516 cart-on-track conveyors, 1518 chain conveyor, 1516, 1517 chute conveyors, 1513 power-and-free conveyor, 1518, 1519 roller conveyor, 1514, 1516 skate wheel conveyor, 1515-1517 slat conveyor, 1515, 1517 sortation conveyor, 1518-1520 tow-line conveyor, 1517 trolley conveyor, 1517-1518 cost reduction in, 1355, 1356 definition of, 1502 equipment used for, 1504, 1505 industrial trucks for, 1505-1513... 

In continuous furnaces, cast or wrought heat-resisting alloys are used for skids, hearth plates, walking beam smictures, roller, and chain conveyors. In most furnaces, the loads to be heated rest on the hearth, on piers to space them above the hearth, or on skids or a conveyor to enable movement through the furnace. To protect the foundation and to prevent softening of the hearth, open spaces are frequently provided under the hearth for air circulation—a ventilated hearth. ... 

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