2. Small Pitch Conveyor Chains
The top of the attachment is higher than the R-rollers, so slats or jigs can be installed over the chains (Figure 2.19). Objects can also be conveyed directly on the K attachments. NOTE: When the bushings and rollers wear extensively, the upper side of the rollers may touch the slats or jigs. Larger than standard over- sized rollers or flanged F-rollers may cause interference with the slat or jigs. Please check with the chain manufacturer. When a wide slat is installed on two A attachment chains, the slats may not be able to support the weight. A chain with K attachments is installed between the A attachment chains to help support the load (Figure 2.20). When the slats are rigid enough and are fastened well to the attachments, there is almost no effect from bending force to the strength of the attachment. But if the slat is not fastened well, make sure to consider the bending force in your calculation. If long jigs are installed, or the attachment receives side loads, it is exposed to twisting forces. The return side of the K attachment chain cannot be supported with guide rails on the rollers. The return may be slack or supported in some other way (Figure 2.21).
Installation of Bucket
Installation of L-angle
Figure 2.19 KAttachment with Jigs
Take-up
Drive
Figure 2.20 Using A and K Attachments
Figure 2.21 KAttachment Configuration (Note return side.)
2.3.3 SA Attachment For the SA attachment, the link plate is extended on one side of the chain, and one or two bolt holes are installed. These are called SA-1 or SA-2 depend- ing on the number of the bolt holes (Figure 2.22). The attachment interval can vary the same as the A attachment. These attachments may be adapted for use with hooks or slats (Figure 2.23). The SA attachment is simpler and stronger than the A attachment, and may receive bending and twisting force depending on the direction of the loads. The return side of the chains can be supported by guide rails on the rollers unless bolts extend into the attachment.
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