MATERIALS HANDLING
calculating the theoretical power requirements of proposed changes in belt-support systems. Added kilowatts (hp) consumption
A well-designed chute structure provides a sealed environment to control spillage and offer enough space for dust to settle
can be calculated by determining the added belt tension, using the standard methods recommended by CEMA. The coefficient of friction of the new (or proposed) support systems, multiplied by the load placed on the belt support from belt weight, material load, and sealing system, equals the tension. There is no need to allow for the removal of idlers, the incline of the conveyor, or other possible factors, as estimates provided by this method will, in most cases, produce results higher than the power consumption experienced in actual use. In applications where there is a lubricant, such as water, consistently present, the actual power requirements may be one-half, or even less, of the amount estimated through these calculations. [Fig. 2, 3, 4]
FIGURE 3: Tension added to the belt due to an impact cradle
CONCLUSION Additional power requirements and costs will seem minor when compared to the power consumed by operating with one ‘frozen’ idler or several idlers operating with a material accumulation. By implementing the proper belt-support systems, a plant can prevent the more costly problems that arise from the escape of fugitive material. Cleanup of spillage not only increases labour costs but, in lieu of unscheduled downtime, exposes workers to activities around and under a running conveyor, a major cause of injuries and death in the bulk handling industries. Testing has found that a well-
design system incorporates slightly elevated power consumption required to prevent spillage, rather than suffer the much higher power consumption and greater consequences that arise from fugitive material. The costs for installation and operation of proper belt-support systems represent an investment and commitment to ongoing efficiency and workplace safety. ●
Andrew Timmerman is Global Engineering Manager at Martin Engineering.
www.martin-eng.com
Power consumption added to drive due to impact cradles and belt support 42
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