| Sample Chainless Line Pull Calculations | |
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Monoplane system |
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1. Total weight of the live loads moving on the system all at the same time (Max) (Wt. per load X total loads) |
LBS. |
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2. Total weight of trolley attachments on the system all at the same time (Wt. per trolley attachment X total number) |
LBS. |
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3. Multiply total length of system X wt./ft (See rod per trolley wt.table here) |
LBS. |
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4. Accumulated total gross load being moved. (sum of 1+2+3 above) |
LBS. |
| 5. Total line pull for system | X |
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6. For line pulls up to 1500# use LGA-601 trolley use drive #LGC-1302 Use LGC-1301 drive unit with LGA-601 trolleys if line pull is 750# or less. If calculated line pull exceeds the drive unit capacity, additional drives is required. Additional Drives Per System Divide selected drive unit capacity into line pull total for total number of drives for system. Use the next whole number if a fraction of a drive is required. |
LBS. |
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7. Horsepower Calculations Total Line Pull X Max. Conv. Speed (FPM) ÷ 16,000 = Total H.P (Total H.P. Formula considers drive efficiency) Total H.P. ÷ Number of Drives Required = Average
H.P. Per Drive |
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| Multiplane System | |
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1. Total weight of live load moving on system at same time (Max) (Wt. per unit X total units) |
LBS. |
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2. Total weight of trolley attachments on the system all at the same time. (Weight per trolley attachment X total Number) |
LBS. |
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3. Multiply total length of system X weight per feet (See rod/trolley weight table here) |
LBS. |
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4. Accumulated total gross load being moved (Sum of items 1+2+3 above) |
X |
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Multiply total gross load by the coefficient of friction for trolley wheels. (See Page 19) |
LBS. |
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5. Total line pull for system Up to this point calculating line pull for a multiplane System is the identical to the method used for Monoplane systems. |
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Multiplane systems take into consideration the total line pull resulting from rises and dips in the system, as well as the total monoplane line pull. The total weight of the load being raised is equal to the force necessary to raise the load. Trolley friction loss on the rail is considered in the calculations for the dips and rises. |
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| Added Line Pull for Rises | |
| 6. Total all elevation increases by adding together the increases for each vertical curve. | |
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7. Multiply Item # 6 above by the maximum per ft. loading on the decline, including trolley and spacer rod weight. (See wt. chart -- here) |
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| Deduct for Declines | |
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8. Total force required to raise loads up inclines (Total wt. of load to be raised) |
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| 9. Add total for item #8 to item #5 for total pull with rises | |
| 10. List total elevation change (Item #6 above) | |
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11. Multiply Item #10 above by the maximum per ft. loading on the conveyor, Including trolley and spacer rod wt. (See weight. chart -- here) |
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| 12. Total force pulling down on incline | |
| 13. Divide Item #12 above by 1.3 to arrive at total deduct allowed for loads on declines. | |
| 14. Subtract Item #13 from Item number #9 to get total line pull required to drive the conveyor system. | |
| 15. For calculation instructions to determine correct number of drives see page 17, Monoplane System, Item #6 Using the above method of calculating line pull, the degree of accuracy is sufficient for most systems. The progressive step method may be more accurate, but when deviations occur in the specified operating conditions, accurate line pull totals are difficult to obtain. | |
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Deviations from Specified Operating Conditions Overloading -- Adding loads to inclines calculated empty Unloaded Declines -- Removing loads from declines calculated with loads. No Lubrication -- Increases line pull. For simplicity the general line pull formula takes into consideration all the pull required to negotiate vertical and horizontal curves and the load factors on declines. When analyzing your Chainless Conveyor applications, carefully review all the facts, then look beyond the stated facts for possible overlooked future requirements. To illustrate this point, many conveyors purchased originally for normal production with partial loading are also used (after instillation) for storage with fully loaded lines. When making your Chainless conveyor applications and recommendations, use your own judgment and experience, in addition to the Catalog instructions. |
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Chainless Conveyor Menu Anatomy |
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