Double Plus Chain & Sprockets

Selection Guidelines

IV. Confirm total chain tension (T T ). In general, a DOUBLE PLUS ® system uses two strands of chain. When calculating the total chain tension (T T ), be sure to include the weight of each strand. The chain tension (T T ) is calculated using the following formula:

III. Confirm the maximum allowable roller load. The roller load due to conveyed objects (see Fig. 1) should not exceed the values shown in Table 4a or 4b (Table depends on prod- uct used.) Figure 1–Conveyed object weight per roller

Figure 2–Distribution of product line

T T = (W 1 + M) L 1 x f 1 + W 2 x L 2 x f 2 + (W 2 + M) L 2 x f 3 + 1.1 M (L 1 +L 2 ) f 1 0.6 x T T x K ≤ Maximum allowable chain tension (Table 1a or 1b) T T : Total chain tension (lbs. or kgf) T s : Chain Tension/Strand (lbs. or kgf) W 1 : Weight of conveyed objects in conveying portion (lbs./ft. or kg/m) W 2 : Weight of conveyed objects in accumulating portion (lbs./ft. or kg/m) M: Weight of chain and slat, etc. (lbs./ft. or kg/m) L 1 : Length of conveying portion (ft. or m) L 2 : Length of accumulating portion (ft. or m) 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 HP: Required horsepower kW: Required kilowatts V: Chain speed (ft./min. or m/min.) : Transmission efficiency of drive unit Note: When there are two strands in parallel, the maximum chain tension should be T s = 0.6 x T T.

Table 4a. Maximum Allowable Roller Load*

Standard and DOUBLE PLUS ® Chain with Snap Covers

Units-lbs./ft. (kgf/m)

Plastic Roller

Steel Roller

Aluminum Guide Rail

Aluminum Frame with Steel Rail

Chain No.

C2030

27 (40)

54 (80)

108 (160)

C2040

40 (60)

81 (120)

161 (240)

C2050

54 (80)

108 (160)

215 (320)

C2060

67 (100)

134 (200)

269 (400)

C2080

— —

202 (300)

— —

Note: These factors are for your reference only.

*This is the load for two strands of DOUBLE PLUS ® Chain

Table 4b. Maximum Allowable Roller Load

Engineering Class DOUBLE PLUS ® Chain

Units-lbs./ft. (kgf/m)

Maximum Allowable

Chain No.

Roller Load

RF03075VR RF03100VR

290

(130)

RF05100VR RF05150VR

530

(240)

V. Calculate required power. HP = T T V x 1.1 or

RF10150VR

770 (350)

kW = T T V x 1.1

33,000

6,120

RF6025VR RF12200VR

1,100 (500)

RF17200VR

1,370 (620)

Note: These factors are for your reference only.