U.S. TSUBAKI TOP CHAIN
Step 4 Determine factors and coefficients (f 2 , f 3 , k 2 , k 3 ) Table IV: Coefficient of Friction (f 2 ) between Top Plate and Liner
2) Curved movement (TRU, TKU, TPU, TNU and TTU chains)
The chain tension for curved movement is calculated similarly to that for linear movement. The tension at corners, however, is com- pensated for by angle factor (K 2 ) and length factor (K 3 ). Calculations are shown below for the illustrated examples.
Stainless Steel Coefficient of Dynamic Friction of Liner Material Steel Ultra High Polymer Polyethylene
Top Plate Material
Lubrication
Dry
0.35
0.35 0.20 0.20 0.25
0.25 0.15 0.15 0.25 0.15
Lubrication by soapy water Oil lubrication Lubrication by soapy water Dry
0.20
Stainless Steel
0.20 0.25 0.15
Polyacetal
0.15
Table V: Coefficient of Friction (f 3 ) between Material Conveyed and Top Plate
Stainless Steel Coefficient of Dynamic Friction of Top Plate Material Polyacetal
Lubrication
Material Conveyed
Plastic and paper containers and film packages Cans (with metal tops and bottoms)
Dry
0.30
0.25
Lubrication by soapy water
0.20 0.35 0.20
0.25 0.10 0.15
Dry
Lubrication by soapy water
Dry
0.40
0.30
Bottles and ceramics
Lubrication by soapy water
0.20
0.20
Dry
0.35
0.25 0.15
Industrial parts (metal)
0.20
Oil lubrication
Table VI: Angle Factor (k 2 ) and Length Factor (k 3 )
Angle Factor (k 2 ) TPU and TNU Chains TRU and TKU Chains Dry Dry Lubricated Lubricated
Length Factor (k 3 )
The tension on the chain at each part ABC . . . F must be calculated. The tension at F is the greatest acting on the chain. T = T ....................Formula 2 Slack side: Chain tension at : T T = L 1 wf 2 k 2 , L 1 = l 1 + R 1 k 3 (k 2 and k 3 at 180°) Chain tension at : T T = {T + L 2 wf 2 } k 2 , L 2 = l 2 + R 2 k 3 (k 2 and k 3 at 90°) Chain tension at : T T = T + L 3 wf 2 , L 3 + l 3 Loaded side : Chain tension at : T T = { T + (M + w) L 4 f 2 + ML ’ 4 f 3 } k 2 , L 4 = l 3 + R 2 k 3 (k 2 and k 3 at 90°) Chain tension at : T T = {T + (M + w) L 5 f 2 + ML ’ 5 f 3 } k 2 , L 5 = l 2 + R 1 k 3 (k 2 and k 3 at 180°) Chain tension at : T T = T + (M + w) L 6 f 2 + ML ’ 6 f 3 3) TO and TU chains
Turning Angle
30° 60° 90°
0.5 1.0 1.6 2.1 2.6 3.1
1.15 1.30 1.50 1.70 1.90 2.20
1.10 1.15 1.25 1.35 1.50 1.60
1.20 1.45 1.75 2.10 2.50 3.00
1.10 1.25 1.35 1.50 1.70 1.85
120° 150° 180°
k 2 and k 3 factors are to be used for curved movement except for TO and TU type. k 3 = • Turning Angle/180° Step 5 Select top plate width Generally, the top plate must be wider than the material conveyed. When materials are very wide and none of the top plate widths are satisfactory, top plates of the same width may be used in multi-strand arrangement. Top plates of different widths can be used together, but this is not desirable since the tension on the chains will be uneven. Step 6 Calculate chain tension (T) 1) Linear movement (TS, TT, TP, TN, TTP and RS-P chains) T = (M + 2.1 w) Lf 2 + ML ’ f 3 . . . . . . . . . . . .Formula 1
Calculations for chain selection vary according to their usage and arrangement. A sample calculation is given below for the arrangement shown on the right.
T = (M + w) Lf 2 + w l f 2 + ML ’ f 3 ...........................Formula 3 4) Calculation of power required TS HP = –––––––––– ................ Formula 4 33,000 • η
B-77
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