2. Small Pitch Conveyor Chains
2.3 Standard Attachments Most applications use small pitch conveyor chains with attachments in one of these ways: • Convey materials directly on chain attachments. • Convey materials on jigs installed on the attachments. The characteristics of the conveyed materials and the working environment are different for each application. Many types of attachments with and without jigs are available. There are many different types of attachments; it would be difficult for chain manufacturers to satisfy all customer requirements for quality, price, and deliv- ery if every type of special attachment chain were made. There are too many variations. Chain manufacturers need mass production to maintain high quali- ty, reasonable prices, and quick delivery, not small production lots of many different items. Current standard attachments are established and selected based upon the long history of attachment chain use and demand, and they provide high qual- ity, economy, and quick delivery to meet the majority of customers’ require- ments. For small pitch conveyor chains, standard attachments include: A, K, SA, SK, D-1, and D-3 types. Standard attachments are available for a wide variety of chains: • With special surface treatments (nickel-plated or WP ® ). • Made of 304 stainless steel or other metals. • For lube-free operations (LAMBDA ® series, etc.). In the following sections, we will explain each standard attachment. 2.3.1 A Attachment An A attachment is most commonly used. It has a bent link plate that extends out on one side of the chain, forming an L-shape. It comes with one or two bolt holes, which are referenced A-1 or A-2, respectively (Figure 2.16). The attachment interval can vary (for example, on each chain link, every five links, or two attachments in a series with intervals every four links, etc.). Generally two strands of chains with slats are used (Figure 2.17).
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