Applications
Due to the difference in diameter between large and small rollers, the pallets move faster than the chains. The speed ratio (K) is calculated by the following formula: K = 1 + (large roller diameter/small roller diameter). The value of K is usually between 2.5 and 3.0. During the accumulating mode, the large rollers that support the pallet rotate in the opposite direction from the small rollers. Due to this relative motion, friction results between the two rollers, and chain tension increases. After the accumulator stop is released, the friction between large and small rollers will gradually increase the pallet speed, and eventually the pallet will resume full conveying speed (Figure 5.5).
Large Roller
Small Roller
Why is Free Flow possible in this structure?
Large Roller
Pallet
Small Roller
Small Roller
• When Conveying -Friction between the large center roller and the small roller allows them to rotate in unison. • When Accumulating -The larger roller rotates freely in the opposite direction of the small roller allowing conveyed objects to accumulate. We call this free flow conveying.
Safety Cover
Steel Base Chain
Small rollers are installed in both sides of large rollers
Guide Rail
Figure 5.5 Basic Operation of DOUBLE PLUS ® Chain
Features of DOUBLE PLUS ® Chain include the following: (1) Safe design, due to only large rollers being exposed when the chain cover is installed. (2) Low operational noise, due to low chain speed. (3) High wear resistance, because the large and small rollers are made of engineered plastic.
Large Roller
Large Roller
Small Roller
Small Roller
Pallet
Pallet
Safety Cover
Safety Cover
Steel Base Chain
Steel Base Chain
Guide Rail
Guide Rail
Figure 5.6 Two Types of DOUBLE PLUS ® Chain
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