II Design guidelines for Double Plus ® Chain
7 - Selection Procedure Example for Double Plus ® Chain
iv - Finishing the ends of the conveying side. Put a chamfer on the ends of the upper rail that the chain’s small rollers travel on Fig. 4.
Table 9b - Screws, Bolts, Height of Conveyor Rail Number 1 2 3 4
5
H L
I – Confirm operating conditions for conveyor Conveyor Length 30 Feet
I – Dimensions for both ends of the conveyor A typical arrangement of Double Plus ® components is illustrated in Figure 1. The bracket is used to mount the plastic return guide to the aluminum guide rail, allowing the chain to flow smoothly between the sprocket and guide rail. See Table 9a for dimensions.
C2030CRP-R3L & R3LS
M6 X 10 M6
M5
M6
M5 2.42 0.57
C2040VRP-R4L & R4LS
M6 X 12 M6
M6
M8
M6 2.68 1.12
Dimensions of conveyed object: 53lbs/piece 53lbs/piece ÷ 1.5 ft. = 35.3 lbs./ft. Conveyed product speed 30ft/min Chain speed: 12 ft./min
Figure 4 – Location of Chamfer
C2050VRP-R4L & R4LS
M8 X 20 M8
M8 M10 M8 3.25 1.42
C2050VRP-R3H & R3HS
M8 X 20 M8
M8 M10 M8 5.61 1.46
Travel portion of the rail for the smaller roller.
C2060VRP-R4K & R4LS
M8 X 20 M8
M8 M10 M8 3.74 1.75
Full conveyor accumulating Quantity of conveyed object: 20 pieces Dry, in-plant use, normal operating temperatures (up to 77°F)
Figure 1 – Typical arrangement of Double Plus ® components
C2080VRP-R3LS
M8 X 25 M8
M8 M10 M8 5.12 1.85
iii – Nominal Spacing of Conveyor Supports Proper operation of Double Plus ® chain is maintained by controlling the amount of deflection of the aluminum guide rail. This deflection is deter- mined from the weight of the conveyed goods and the second moment of area, shown in Table 9c. To control deflection, supports should be spaced as shown in Figure 3, in accordance with the following equation:
II – Select initial chain size Use the calculation method in Step 2 on page 263.
T t = W t x (f 2 + f 3 ) x K T t = (35.3 (lbs.ft.) x 30 ft. ) x (0.1 + 0.2) x 1.0 = 318 lbs T s = 318 x 0.6 = 190.8 lbs
= (in) [384 x E x L x d x 12 ÷ 5 x 0.6 x W] ¼
= Spacing support (inches) E = Young’s Modulus = 9.956 x 106 lbs./in L = Second movement area = in 4 (See table 9c) d = Deflection = 0.079 in. W = Total conveyed weight = lbs./ft.
Note – Presume two strands of chain, each loaded by 0.6 of the total.
Table 9a - Conveyor End Dimensions
L 2
L 2
H
Z
L 1
Based on these calculations, C2040VRP-A chain is the preliminary choice but this selection must be confirmed.
Chain Number
Driver Side Driven Side
C2030CRP-R3L & R3LS
0.839
1.57
8.27
3.15
0.98
It is possible to prevent the chain’s large roller form dipping at the chamfered portion by installing a support for the large roller on the ends of the rail on the driven side.
Note: C2040VRP-A weight/ft. = .67 lbs./ft. per strand (1.34 lbs./ft. for two strands)
C2040VRP-R4L & R4LS
0.579
1.97
11.81
3.94
0.98
Figure 3 – Nominal spacing of conveyor supports (l)
C2050VRP-R4L & R4LS
0.634
2.36
13.39
4.72
1.18
C2050VRP-R3H & R3HS
3.000
2.36
13.39
4.72
1.18
III – Confirm the maximum allowable roller load By consulting Table 1 on page 263, you find that for C2040VRP-A, the maximum allowable load is 40 lbs./ft. for the aluminum rail. In this example, the weight of the conveyed object is 35.3 lbs./ft. Therefore, C2040VRP-A can cover the load.
C2060VRP-R4K & R4LS
0.587
2.76
16.93
5.12
1.57
v – Aluminum frame with steel rail. Two basic constructions are used when building guide rail with aluminum frame and steel rail. For C2030VRP-R3LS, a steel rail (No. 3) is arranged in the vertical position and lock screws (No. 4) are secured into the frame (no. 1) from both sides (See Fig 5a). See Table 9d for dimensions and hardware.
C2080VRP-R3LS
0.945
3.94
21.65
7.87
2.36
ii – Screws, bolts, height of conveyor The values for L shown in 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.
IV – Confirm total chain tension Using the calculation method of total chain tension (T t ):
T t = (0 x 1.34) x 0 x .08 + 35.3 x 30 x .10 + (35.5 + 1.34)x 30 x .20 + 1.1 x 1.34 x (0+30)x .08
Table 9c - Second Moment of Area
Second moment of area (L) in 4
Rail No.
T t = 329 lbs. T s = Tt x .6 = 1967 pounds per strand. Now determine chain size: Multiply the chain tension (T s ) by the chain speed coefficient (K) in Table 6 on page 264, confirm with the following formula: T s x K ≤ Maximum allowable chain tension (Table 7). 197 x 1.0 ≤ 200 (C2040VRP regular plastic)
Figure 2 – Location of screws and bolts
C2030VRP-R3L
0.411
C2040VRP-R4L
0.965
C2050VRP-R4L
2.019
Aluminum Guide Rail
C2050VRP-R3H
9.809
C2060VRP-R4L
3.247
C2060VRP-R4K
2.607
C2030VRP-R3LS
0.428
C2040VRP-R4LS
1.065
For C2040 – C2080 Double Plus ® Guide Rails with steel inserts – Lock screws (no. 4) are secured through the inner rail (no. 2), which anchors the steel rail (no. 3) to the frame (no. 1) (see Fig 5b). See table 9d for dimensions and hardware.
C2050VRP-R4LS
2.297
V – Calculate required power *Presume gear motor efficiency (ᵑ) = 0.8
Aluminum Frame with Steel Rail
C2050VRP-R3HS
10.621
C2060VRP-R4LS
4.127
HP = 329 lbs. x 12 ft./min x 1.1 ÷ 33,000 x 0.8 = .17 or ¼ HP
C2080VRP-R3LS
8.666
265
266
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