5. Free Flow Chains
There are two design types of DOUBLE PLUS ® Chain. These are shown in Figure 5.6. In Figure 5.6 (left), the large roller is positioned between two small rollers equipped with a step. The step portions of each small roller face each other and are inserted in the ID of the large rollers, thus holding them in posi- tion. In the right-hand illustration, the large roller is equipped with steps on both sides. The small roller is positioned over each step. Although the designs are different, the performances are practically the same. In Figure 5.6, the left-hand chain has a K speed ratio close to 3, which is slightly higher than the other type. In the design shown in Figure 5.6 (left) when the chain engages with the sprockets, the large rollers don’t lock; therefore, the pallets travel at the nor- mal conveying speed (three times the speed of chain) at the exit or entrance of the conveyor. In the right-hand illustration, the large rollers lock when the chain engages with the sprockets. Therefore, the pallet speed is reduced to the chain speed at the conveyor exit or entrance. This is convenient if you want to transfer a pallet to another conveyor moving at a slower speed. If sprockets are lowered slightly, constant conveying speed at the exit from the conveyor is maintained. The sizes of DOUBLE PLUS Chain are shown in Table 5.1.
Table 5.1 DOUBLE PLUS ® Chain Sizes
Chain
Chain
Large Roller
Small Roller
Allowable Load kN*
No.
Pitch Diameter
Width
Diameter
Width
RF2030VRP 19.05 RF2040VRP 25.40 RF2050RFP 31.75 RF2060VRP 38.10 RF2080RFP 50.80
18.3 24.6 30.6 36.0 48.0
8.0
11.91 15.88 19.05 22.23 28.58
4.0 5.7 7.1 8.5
0.55 0.88 1.37 2.06 5.29
10.3 13.0 15.5 20.0
15.0
* Regular Type (A)
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