ENGINEERING INFORMATION
II. DESIGN GUIDELINES FOR DOUBLE PLUS ® CHAIN i) Dimensions for both ends of the conveyor.
7) Selection Procedure Example for DOUBLE PLUS ® Chain i) Confirm operating conditions for conveyor. Conveyor length: 30 ft. Dimensions of conveyed object: 1.5 ft. square Weight of conveyed object: 53 lbs./piece 53 lbs./piece ÷ 1.5 ft. = 35.3 lbs./ft. Conveyed product speed: 30 ft./min. Chain speed: 12 ft./min. Full conveyor accumulating Quantity of conveyed object: 20 pieces Dry, in-plant use, normal operating temperatures (up to 77°F) ii)Select initial chain size. Using the calculation method in Step 2 on page B-56: T T = W T • (f 2 + f 3 ) • K T T = (35.3 lbs./ft. • 30 ft.) • (0.1 + 0.2) • 1.0 = 318 lbs. T s = 318 lbs. • 0.6 = 190.8 lbs. Note: Presume two strands of chain, each loaded by 0.6 of the total. Based on these calculations, C2040VRP-A chain is the pre- liminary choice, but this selection must be confirmed. Note: C2040VRP-A weight/ft. = 0.67 lbs./ft. per strand (1.34 lbs./ft. for two strands). iii) Confirm the maximum allowable roller load. By consulting Table 1 on page B-56, you find that for C2040VRP-A, the maximum allowable roller load is 40 lbs./ft. for aluminum rail. In this example, the weight of the conveyed object is 35.3 lbs./ft. Therefore, C2040VRP-A can cover roller load. iv) Confirm total chain tension. Using the calculation method of total chain tension (T T ): T T = (0 + 1.34) • 0 • 0.08 + 35.3 • 30 • 0.10 + (35.3 + 1.34) • 30 • 0.20 + 1.1 • 1.34 • (0 + 30) • 0.08 T T = 329 lbs. T S = T T • 0.6 = 197 lbs. per strand Now determine chain size. Multiply the chain tension (T S ) by the chain speed coefficient (K) listed in Table 6 on page B-57, confirm with the following formula: T S • K ≤ Maximum allowable chain tension (Table 7). 197 • 1.0 ≤ 200 (C2040VRP regular plastic)
A typical arrangement of DOUBLE PLUS ® components is illustrated in Fig. 1. The bracket is used to mount the plas- tic return guide to the aluminum guide rail, allowing the chain to flow smoothly between the sprocket and guide rail. See Table 9a for dimensions.
Figure 1–Typical arrangement of DOUBLE PLUS ® components
Table 9a. Conveyor End Dimensions
Z
L 1
L 2
L 2
H
Chain No.
(Driver side) (Driven side)
C2030VRP-R3L & R3LS C2040VRP-R4L & R4LS C2050VRP-R4L & R4LS C2050VRP-R3H & R3HS C2060VRP-R4K & R4LS
0.839 1.57 8.27 3.15 0.98 0.579 1.97 11.81 3.94 0.98 0.634 2.36 13.39 4.72 1.18 3.000 2.36 13.39 4.72 1.18 0.587 2.76 16.93 5.12 1.57 0.945 3.94 21.65 7.87 2.36
C2080VRP-R3LS
ii) Screws, bolts, height of conveyor. The values for L shown in Table 9b and Fig. 2 vary because of the plastic bumper wall thickness tolerance. Connecting the aluminum guide rail Connect the aluminum guide rails by aligning the V groove shown by arrow A in Fig. 2. Installing the pallet guide rail Drill holes using the V groove as a guide, shown by arrow B in Fig. 2, and install the pallet guide rail using socket head cap screws from Table 9b. Figure 2–Location of screws, bolts
In this example, we would choose C2040VRP-A Chain.
v)Calculate required power. *Presume gearmotor efficiency ( η ) = 0.8 HP = 329 lbs. • 12 ft./min. • 1.1 33,000 • 0.8 • This calculation sample is for your reference only.
Table 9b. Screws, Bolts, Height of Conveyor
= 0.17 = 1/4 HP motor
Rail No.
1
2 3 4 5 H L M6 M5 M6 M5 2.42 0.57 M6 M6 M8 M6 2.68 1.12 M8 M8 M10 M8 3.25 1.42 M8 M8 M10 M8 5.61 1.46 M8 M8 M10 M8 3.74 1.75 M8 M8 M10 M8 5.12 1.85
C2030VRP-R3L &R3LS C2040VRP-R4L & R4LS C2050VRP-R4L & R4LS C2050VRP-R3H & R3HS
M6 x 10 l M6 x 12 l M8 x 20 l M8 x 20 l
C2060VRP-R4K & R4L & R4LS M8 x 20 l
C2080VRP-R3LS
M8 x 25 l
B-58
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