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Understanding Augers: Types, Capacities, and Adjustments for Efficient Grain Conveying

This lecture focuses on augers used for grain conveying, covering both portable and permanent installations. Key topics include theoretical and actual capacities (CFTHR), horsepower calculations (CHP), and adjustment methods based on different capacity ranges. Various types of augers, such as U-trough and tube augers, are examined for their operational characteristics, efficiency, and cost-effectiveness. The presentation also includes formulas for determining the appropriate auger length based on installation angles and bin dimensions, ensuring optimized performance for handling agricultural materials.

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Understanding Augers: Types, Capacities, and Adjustments for Efficient Grain Conveying

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  1. Lecture 18 Augers, Hp & Adjustments

  2. Augers (screw augers) • portable •  grain or wagons •  permanent (under bins) •  conveying feed (flexible) •  sweep augers •  stirring devices

  3. Theoretical capacity CFTHR = (D2 - d2) * P * RPM 36.6 CFTHR = cubic feet / hour material moved D = diameter of screw, inches d = diameter of shaft, inches P = pitch of auger, inches (usually = to D) RPM = revolutions per minute of shaft. Note- actual capacity is usually 1/3 to ½ the theoretical capacity

  4. Horsepower CHP = C * L * W * F    33,000 CHP = computed horsepower C = conveyer capacity, (ft3 / min L = length of conveyer (ft) W = Bulk weight of material (lb/ft3) F = material factor (table 6.1)

  5. Adjustments to horsepower if CHP < 1, HP = 2.0 * CHP if 1<=CHP <2, HP = 1.5 * CHP if 2<=CHP <4, HP = 1.25 * CHP if 4<=CHP <5, HP = 1.1 * CHP if CHP >5, HP =1.0 * CHP

  6. Augers •  Tube & U trough augers •  Most common, U trough operates at slower speeds than tube augers. •  U-trough = less damage to your grain •  tube augers are less expensive •  Portable augers •  Diameters = 6" to 12" •  Length = 27' to 81' •  45 degree or less is practical

  7. Formulas to calculate auger length needed... if the auger angles greater than bin roof slope: L = BEHGT + (.05 * BND)   SIN (t) COS (t) If auger angles less than or equal to bin roof slope: L = BEHGT + .05 * BND * TAN (r)      SIN (t) L = length of auger BEHGT = eave height of bin (ft) BND = bin diameter (ft) t = angle of auger relative to ground (degrees) r = slope of bin roof (degrees)

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