Elevators Using Engineering Steel Chains

There are four basic types of bucket elevators centrifugal discharge, positive or perfect discharge, continuous bucket, and supercapacity. These are shown in Fignre 11-4 and are described in the following paragraphs. 

Style A cast elevator buckets are used when very small buckets are required for handling coal, cement, ash, sand, stone, gravel, and similar materials. They are furnished in either malleable or pearhtic malleable iron. 

Style AA cast elevator buckets, which have generally replaced style A in popularity, are designed similar to style A except that a heavy reinforcing band is cast along the front. Style AA buckets are furnished in either malleable or pearlitic malleable iron. 

Style AA-RB cast elevator buckets are used for handling heavy abrasive products under severe service and impact conditions. Buckets are designed similar to style AA with reinforcing ribs on the front and with backs twice the normal thickness. They may be furnished in either malleable or pearlitic malleable iron. 

Style AC cast elevator buckets are designed specifically to increase elevator capacity by closer bucket spacing. Style AC buckets are used for handling material snch as raw meal, crushed clinker, and finished cement. Air ports are provided in the bottom of the bucket to act as a relief valve for faster loading and unloading of light, fluffy materials. 

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There are many general types of engineering steel chains, and some of those covered in this book are shown in Figure 1-19 to Figure 1-22. Those with steel rollers are perhaps the most widely used on both drives and conveyors. The bushed, rollCTless style meets the needs of many conveyor and bucket elevator applications. Welded steel versions of the basic cast chains are now quite popular, and a simple bar-link type is used for slow-moving conveyors and tension hnkages. Each of these types is illustrated and described in detail in a subsequait chapter. 

Since engineering steel chains are used in such a wide variety of applications, many different attachments are available. Figure 2-30 illustrates some of the more common attachments available for engineering steel chains for use in conveying and elevating. These attachments are better suited... 

Many different types of engineering steel chains are used in a wide variety of apphcations. Most engineering steel chains are used in conveyors, bucket elevators, and tension linkages. Only a few are used in drives. Space does not permit a discussion of all the different types of engineCTing steel chains mentioned in chapter 2. Only straight sidebar chains, with and without rollers, for conveyors and bucket elevators, and offset sidebar chains for drives will be discussed. Welded steel chains and block and bar chains are beyond the scope of this chapt. ... 

Use engineering steel bushed straight sidebar rollerless chain for elevators in which the chain hangs free and in which the chain is exposed to the conveyed material as it is scooped up during loading. 

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