Basics
TR: Top roller chain SR: Outboard roller chain TP: Top chain NF: Block chain (bar and pin) NFX: Block chain—flow conveyor type
See Applications Section for details of these chains.
4.2.3 Selection of Chain Type and Specification A conveyor design can use a variety of chains, depending on the type of operation, conditions, and material conveyed. Here we present a few points of notice about selection. 1.Consider RF, RS, or TP chain first. Typical applications are outlined in Table 4.4. 2.If there are no special temperature or environment concerns, and if the chain is not subject to rough usage, you can use plastic roller or RF-B chain. This reduces the amount of friction. 3.When you require accurate stopping location or must avoid chain elongation, select RFN. 4. NF is suitable for rough use and for conveyance of high-temperature objects.
Table 4.4 Determination by Usage
Roller
Center
Conveyed Material
Type of Chain
Pitch Type Distance
Weight
Size
Rigidity
RS Attachment Chain Short
S
Short
Light Light
Small
Low
RF Double Pitch Chain Medium R • S Medium
Small ~ Medium Mid
RF Conveyor Chain
Long R• F • S Long Medium ~ Heavy Medium ~ Large High
Table Top Chain
Medium N/A Medium
Light
Small ~ Medium Low
4.2.4 Points of Notice About Roller Type Figure 4.17 shows the roller types and ways of guiding used in conveyor chains. 1.First of all, consider if an R-roller will meet the operating conditions. 2.An S-roller is designed to relieve shock caused by sprocket engagement, but when the conveyed objects are light and the conveyor length is short, an S-roller may be used. 3. An F-roller is used primarily to prevent snaking in large pitch conveyor chains. Because its flange operates and wears against the side rail, it is not the roller of choice to convey heavy objects or bulk material or to operate at high speeds.
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