CALCULATIONS SUMMARY SHEET Engineer's Stamp
Project: Item:
Project #: Calculations by: cdk Checked by:
Rev.#: Date: Date:
BELT CONVEYOR AND BELT FEEDER DRIVE SIZING CALCULATIONS CALCULATIONS The reference material for this spreadsheet consists of CEMA's 4th Edition of Belt Conveyors for Bulk Materials from which all of the lookup values are obtained.
BELT CAPACITY Required Conveying Rate: Material Conveyed: Material Density: Angle of Repose: Angle of Surcharge: Belt W idth: Trough Angle (0 for flat belt): Maximum Load Cross Sectional Area: Maximum Belt Capacity: Maximum Lump Size: Belt Speed: Design: Minimum to Handle Design Capacity: Maximum Capacity at Design Speed:
24.00 Sand 30.0 45.0 30.0 36.0 0.0 1.1420 6,857.00 0.2
tph lb/ft deg deg in deg ft2 3 ft /hr/100fpm in
25.0 fpm 23.3 fpm 25.714 TP T PH
IDLER DESIGN (Only Belt Weight W b req'd for Pan Belt Conveyors) Troughing Idler Info: Diameter 4.0 in Class (A-E) C Load Rating 837.0 lb er pac ng: 4.00 4.000 0 ft i, oa Return Idler Spacing: 10.0 ft , ump ustment actor: 1.00 1 ronmenta nta & a nte ntenan nance ce actor: actor: 1.15 2, nv ronme , erv ce actor: a ctor: 1.20 3 pee act actor: or: 0.85 4, e t pee , e t n t e g t : * * 9.0 lb/ft b ater a n t e g t: m, Max Material W eight 34.26 lb/ft Actual Material W eight 32.00 lb/ft Idler Load (Max material weight): 173.04 lb lb Adjusted Idler Load (Max material weight): 202.98 lb Suitability of Idler Selection: Selection is OK
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<< input << input << input << input << input << input << input << input << input << input
CEMA 4th Edition Table or Figure or Page
Table 3-3 Table 3-3 Table 3-3 Table 3-1 Figure 4-1 Tables 4-2 to 4-5 Tables 4-2 to 4-5
Table 4-1 << input Should be less than design
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Tables 5-8 to 5-12 Tables 5-8 to 5-12 Table 5-2 Table 5-2 Table 5-4 Table 5-5 Table 5-6 Table 5-7 Table 6-1
1
Te, EFFECTIVE TENSION Conveyor is Pan Type (Y or N): Coefficient of Dynamic Friction: # of Plows: # of Belt Cleaners (Scraper Type): L, Length of Conveyor (3000 ft maximum): H, Lift of Conveyor (Negative for Declining): # of Tight Side Non-Driving Pulleys: # of Slack Side Non-Driving Pulleys: Belt Material (Fabric or Steel): Approximate Tight Side Tension (Iterate): Approximate Slack Side Tension (Iterate): Number of drive pulleys: Lb, Length of Skirtboards (1 Side):
N 0.45 0.0 1.0 40.0 ft 15.0 ft 0.0 0.0 Fabric 29,040.0 lbs 15,840.0 lbs 1.0 8.0 ft
<< input << input Pan Conveyor Only << input << input << input << input << input << input << input << input from below << input from below << input << input
Kt, Temperature Factor:
1.0
<< input
Fig 6-1
Ai:
1.8
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Page 76
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Tables 6-2, 6-3
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Calculate Table 6-7
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Page 84
Kx:
0.48 0.48 lb/f lb/ftt
Ky: Material velocity component in direction of belt travel as it is fed onto conveyor: Cs, Skirtboard Friction Factor: Hopper used to regulate flow of material (Y or N)? w, W idth of Hopper Outlet: l, Length of Hopper Outlet: Tp, Tension From Non-Driving Pulleys:
0.028 300.0 0.0095 N 0.0 0.0 0.0
fp f pm
in in lb
Tam, Tension from Acceleration:
-1.9 1.9 lb
Tsb, Skirtboard Tension:
49. 49.0 lb
Ttr, Tripper Tension:
0.0 lb
Tpl, Plow Tension:
0.0 lb
Tbc, Belt Cleaner Tension: Tension required to extract material from hopper (normal operation): Tension from belt on slide (Pan Conveyor Only): Te, Effective Tension (Required for Operation):
BELT SELECTION Angle of W rap, Drive Pulley: Wrap Factor Cw: (Lagged) T2, Slack-Side Tension Required to Prevent Slip
180. 180.0 0 lb 0.0 lb 0.0 lb 777.2 lb
180.0 deg 1.20
with Dry Belt (higher for wet conditions): Allowable percent sag of belt: T0, Required Belt Tension to Reduce Sag:
932.6 lb 2.00 % 1,03 1,033. 3.2 2 lb
T1, Operating Maximum Belt Tension: Maximum Belt Tension per inch (operating): Maximum Allowable Starting Tension:
1,70 1,709. 9.8 8 lb 47.5 lb/in 330.0 lb l b/in
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Table 6-8
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Table 6-10
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Calc's p. 102-110
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Manufacturer
2
MOTOR SELECTION Operating Shaft Power Required from T e:
0.6 0.13 98.5 99.0 0.7
Drive pulley friction loss horsepower: Speed Reduction Efficiency: Motor and Power Supply Efficiency: Operating Motor Power Required:
hp hp hp % % hp hp
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Manufacturer
Effective Tension Required for Starts: Percentage Full Load Torque req'd for Starts: Breakaway Torque Required for Starting:
1,074.4 lbs 138.2 % 3.1 ft-lbs
Selected Motor Horsepower: Selected Motor RPM: Motor Locked Rotor Torque (percentage of rated full load torque. Use 140% max for VFD applications, check with manufacturer): Motor Pull Up Torque (percentage of rated full load torque, check with manufacturer): Motor Rated Full Load Torque: Breakaway Torque Available for Starting: Minimum Pull Up Torque Available:
10.0 hp 1,750.0 rpm
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250.0 %
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Table 13-1
175.0 30.0 75.0 52.5
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Table 13-5
Break reakaw awa ay Torq Torqu ue Suf Sufficien cientt for Start arting: ng: Pull Pull Up Torq Torque ue Suff Suffic icie ient nt for for Accel cceler erat atio ion: n: Selected Motor and Drive O.K.: Reduced Torque Starting Required:
% ft-lbs ft-lbs ft ft-lbs
YES YES YES YES YES YES
Notes and Comments: 1. This design method does not cover conveyors of over 3000 feet length, horizontally curved conveyors, conveyors, head and tail driven conveyors, high lift conveyors, large decline with braking requirements or conveyors with undulating geometrics.
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2. This design method uses actual expected expected belt loading. It is worthwhile checking the horsepower horsepower requirements for a fully loaded belt in case of future higher capacity requirements. 3. Motor starting torque characteristics and conveyor conveyor acceleration should be checked in depth to ensure compatibility compatibility between motor and conveyor.
PULLEY SELECTION (Based on Dodge PT-Components Engineering Catalog:) Selected Motor Horsepower: 10.0 hp Pulley Face W idth: 38 Inches Design Bearing Center to Center: 51.00 In Inches BCMF: 13.00 Te (Effective Tension): 13,200.0 lbs Drive Factor: (1.2 for bare manual, 0.8 for lagged) 1.2 T2 (Slack Side Tension): 15,840.0 lbs T1 (Tight Side Tension): 29,040.0 lbs Design PIW (Drive Side): 806.7 lbs per inch Design PIW (Slack Side): 440.0 lbs per inch Arc of Contact: 180.0 degrees Tail Pulley Diameter: (Ext'g., Bare) 20.0 In Inches Drive Pulley Diameter: (Lagged, 1/4") 24.5 In I nches Check on Tail Pulley to Belt Tension 275 lb l bs per inch Check on Drive Pulley to Belt Tension 345 lb l bs per inch Selected Tail Pulley Size O.K.: NO Selected Drive Pulley Size O.K.: NO SHAFT SELECTION (Based on Dodge PT-Components Engineering Catalog:) Resultant Pulley Load (Tail): 28,321.8 lb lbs COOK ENGINEERING Resultant Pulley Load (Drive): 40,122.6 lb lbs Design Drive Pulley Shaft Size: 2.9375 In Inches
Page 119
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Table 2 pg.13-52
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Table 1 pg.13-12 Table 1 pg.13-12 Manufacturer Manufacturer
3 << input
Manufacturer
Design Tail Pulley Shaft Size: Check on Drive Shaft Load Rating: Check on Tail Shaft Load Rating: Design Steel Shafting Grade: (1045) Valve N Adrive (use Table 4 to choose correct A calc.) calc .)
2.1875 In Inches 3200 lb lbs 1100 lb lbs 8,000 ps psi 6.5 Inches 8.25 8.25 Inch Inches es
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KB-drive (KB = 1.5 or K B = 2.5 for Overhung load) Check on Drive Pulley Shaft from Torque: Atail (use Table 4 to choose correct A calc.)
2.50 6.5640 Inches 8.13
<< input
KB-tail (KB = 1.5 or KB = 2.5 for f or Overhung load) Check on Tail Pulley Shaft from Torque: Selec electted Dri Drive Pull Pulley ey Shaf haft O.K. .K. for Load Load:: Sele Select cted ed Driv Drive e Pul Pulle ley y Shaf Shaftt O.K. O.K. for for Tor Torqu que: e: Selected Tail Pulley Shaft O.K. for Lo Load: Selec electted Tail Tail Pul Pulley ley Shaf Shaftt O. O.K. for Tor Torqu que: e:
1.50 4.7896 Inches
<< input
Manufacturer Table 3 PT13-13 Table 3 PT13-13 Manufacturer
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<< input
NO NO YES NO
BELT SELECTION Select a belt with a MOR 1/4" X 1/8", Grooved Pattern SELECTION: SCANDURA ROLYALON 3-330 BELT SPEED REDUCER SELECTION (Based on Dodge Gearing Catalogue:) Dodge TDT Series Convert FPM to RPM: 3.9 RPM Determine Service Factor: 1 Calculate Equivalent HP 10 HP Application Class II Select Unit Size & Ratio TDT425 Unit ratio 24.38 Ratio Therefore reuse existing 10 hp motor, new TDT425 reducer required
< Note: Manual add in lagging thickness << input Table 2 pg.2-7
BELT DRIVE SELECTION (Based on Dodge PT-Components Engineering Catalog:) Determine Service Factor: 1.5 Design HP: 15.0 Determine Overall Ratio Required: 448.99 Determine Belt Drive Ratio: 18.42 Selected nearest ratio 1.31 Driver Sheave OD 5.70 Inches Driven Sheave OD 7.50 Inches HP Per Belt 3VX series 15.64 Minimum Number of belts required: 1.0 Belt Selection 5VX-500 Belt Center to Center Distance 16.4 Note: Designer can also use Dodge PT-Components Engineering Catalog pg. PT7-1
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pg G1-21
table 2 pg PT7-43
Motor rpm/belt rpm Overall Ratio/reducer ratio << input Page B-168 << input Page B-168 << input Page B-168 << input Page B-168 << input << input
Page B-168
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