ENGINEERING INFORMATION I. Selection Procedure for DOUBLE PLUS ® , Outboard Roller and Top Roller Chain
4) Calculation of maximum chain tension (T)
1) Confirmation of operating conditions for free flow conveyor The following information is needed in order to select an appropriate chain for free flow conveyor: Material weight, dimension and quantity of the conveyed object (including pallet) Conveyor speed Conveyor length (the length for accumulating and transferring portion respectively) Lubrication requirements and environment W T : Total weight of conveyed object except chain (lbs.) f: Coefficient of friction f = f 2 +f 3 (See page B-57, Tables 4 and 5 or Table 8) K: Chain speed coefficient (See page B-57, Table 6) Note: In the case where two matched strands are to be operated, the chain’s maximum allowable tension (shown in Table 7, page B-57) should be compared with T • 0.6 to decide the chain type and size. 2) Tentative selection of chain size T = W T • f • K 3) Confirmation of the maximum allowable roller load The maximum allowable roller load for conveyed objects should not exceed the figures shown in Table 1. However, maximum allowable roller load for the base chain should be checked using Table 2. Table 1 Maximum Allowable Roller Load for Conveyed Objects This is the load at 2 strands for DOUBLE PLUS chain (lbs/.ft.) Chain Type of Type Guide rail C2030VRP C2040VRP C2050VRP C2060VRP C2080VRP Aluminum 26 40 53 67 – DOUBLE
T = (W 1 + M) L 1 f 1 + W 2 L 2 f 2 + (W 2 + M) L 2 f 3 + 1.1 M (L 1 + L 2 ) f 1
5) Calculation of required power (HP) TV • 1.1 Hp = ––––––– 33,000 η P: Maximum number of pallets on conveyor T: Maximum chain tension (lbs.) L 2 : Length of accumulating portion (ft.) W 2 : Weight of conveyed objects in accumulating portion (lbs./ft.) L 1 : Length of conveying portion (ft.) W 1 : Weight of conveyed objects in conveying portion (lbs./ft.) f 1 : Coefficient of friction between chain and rail when conveying f 2 : Coefficient of friction between chain and conveyed object when accumulating f 3 : Coefficient of friction between chain and rail when accumulating M: Weight of chain and slat, etc. (lbs./ft.)
Hp: Required power (Hp) V: Chain speed (ft./min.) η : Transmission efficiency of drive unit l : Length of pallet
Calculate the maximum chain tension (T) with the following formula referring to Table 3 and Tables 4 and 5 (or Table 8) on page B-57. T = (W 1 + M) L 1 f 1 + W 2 L 2 f 2 + (W 2 + M) L 2 f 3 + 1.1 M (L 1 + L 2 ) f 1 In general, free flow conveyor should have two matched strands of chain and in this case, the chain weight should be for two strands of chain. T, calculated with the above formula, is the maximum chain tension for two strands of chain.
PLUS Aluminum Chain with steel rail
53
80
107
134
201
Note: When using aluminum frame with steel rail, the maximum allowable load for VR series is twice that of VRP series.
(lbs./roller)
Type of Roller RS40
RS50
RS60
RS80
RS100
Chain for transfer
C2040 C2050 C2060 C2080 C2100
Plastic out- board roller Steel out- board roller Plastic top roller Steel top roller
Top Roller Chain Outboard Roller Chain
11
15
30
55
66
Table 3 f 1 : Coefficient of Friction between Chain and Rail when Conveying
33
44
66
121
176
11
15
30
55
66
Type of Roller on
(Single Strand)
Chain Type
Base Chain
Dry Lubricated
33
44
66
121
176
Regular and high
DOUBLE PLUS Chain friction type
0.08
–
Table 2 Maximum Allowable Roller Load of Base Chain
“S” roller
0.21 0.14
Steel roller
(lbs./roller)
“R” roller “S” roller
0.12 0.08
Type of Roller on Base Chain
RS40
RS50
RS60
RS80
RS100
Outboard Roller Chain
C2040 C2050 C2060 C2080 C2100
0.12
–
Plastic roller
Steel Roller Plastic Roller
“S” roller “R” roller “S” roller “R” roller
33
44
66
121 594
176 880
“R” roller
0.08 0.25
– –
143
220
352
Poly -Steel
4
7
11
–
–
“S” roller
0.21 0.14
Steel roller
44
66
110
198
286
Top Roller Chain
“R” roller
0.12 0.08
Poly-Steel
4
9
13
–
–
Note: The above figures for Poly-Steel show the maximum allowable load per plastic inner link.
Note: These factors are for your reference only.
B-56
Made with FlippingBook Digital Proposal Creator