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Lecture 20

Lecture 20. Conveyors. Grain Spreaders.  most common = spinner  most = electric motor driven  some use rotating auger  some natural drop of grain fines tend to fall in one place  restricts air flow through this area  no hand leveling needed . Chain Conveyers.

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Lecture 20

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  1. Lecture 20 Conveyors

  2. Grain Spreaders •  most common = spinner •  most = electric motor driven •  some use rotating auger •  some natural drop of grain • fines tend to fall in one place •  restricts air flow through this area •  no hand leveling needed

  3. Chain Conveyers • (Also called flight or drag) •  if at bottom of conveyer = drag •  if at top of conveyer = flight •  operate at less than 200 ft/min •  quieter than an auger

  4. Power requirements: Hp = 2 * V * LC * WC * FC + Q * (LL * FM + HTDC)       33,000 V = velocity of chain (ft/min) LC = horizontal projected length of conveyer (ft) WC = weight of flights and chain (lb/ft) FC = coefficient of friction for chains and flight Q = quantity of material to be handled (lb/min) LL = horizontal projected length that is "loaded" (ft) FM = coefficient of friction for material(table 6.10) HTDC = discharge height (ft)

  5. Power requirements • Projected conveyer length •   LC = COS (c) * TCL •   c = angle of elevation of conveyer •   TCL = total conveyer length •  Material to be handled •   BPH = Bu / hr capacity •   BD = Bulk density of material (table 6.1) •  Projected horizontal conveyer length •   LL = COS (c) * TLL •  Discharge height •   HTDC = SIN (c) * TLL •   TLL = total loaded length of conveyer

  6. Belt conveyers - elevators • very efficient •  relatively expensive •  low damage levels •  seed conditioning systems •  high carrying capacities •  greatest angle of elevation for grain = 15 = 17o

  7. Capacity BLTCAP = 48 * CSA * BLTS BLTCAP = belt conveyer capacity (bu/min) CSA = Cross sectional area (ft2) BLTS = belt speed (ft/min)  three rollers (determines belt capacity)  flat can be used (reduces capacity)

  8. Total belt width = THW = CW + COS (rola) * (TBW-CW- 2 * M) THW = Total horizontal width of belt TBW = Total Belt width CW = Center width rola = angle of rollers M = margin clearance on each side of the belt

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