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Lecture 19

Lecture 19. Augers, Bucket Elevators & Componets. Receiving Pits and Hoppers. Key design considerations: 1) able to unload in specific period of time  2) width must accommodate unloading width  3) angle at least 45 degree angle, if powder like material, then at least 60 degrees.

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Lecture 19

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  1. Lecture 19 Augers, Bucket Elevators & Componets

  2. Receiving Pits and Hoppers • Key design considerations:1) able to unload in specific period of time  2) width must accommodate unloading width  3) angle at least 45 degree angle, if powder like material, then at least 60 degrees

  3. Pit capacity PITCAP = M * (VUR - GRRP) pitcap = capacity of pit M = max time to unload in minutes VUR = max delivery vehicle unloading rate-bu/min. GRRP = grain removal rate from pit - bu/min

  4. Pit Considerations • Top Surface Dimensions •  Rule of thumb - distance between wheels •  Design issues - p. 264 • ideally, top dimension = width of tires square with this being the outside dimensions of  the pit... • Unloaded by auger... p. 266 • Unloaded by gravity... p. 267 • Other pit considerations • conveyer belt should be locked in the event that the conveying mechanism ahead of it stops. • can you clean it? (Easily?) • type of grating • sump pump if needed • height to raise bed of truck

  5. Wet holding Bins • Ability to hold grain for one day •  depends on type of drying system • Filling the wetholding bin... •  filling rate a function of incoming conveyer •  if inflow less than drying rate, small bin needed •  lock electrically to prevent blockage •  gravity flow is great advantage •  forms a natural hopper •  needs to be cleaned daily •  needs another way to empty bin than through the dryer (bypass the dryer

  6. Continuous Flow WHCAP = (HR - DR) * HTIME - PCAP WHCAP = wet holding capacity HR = max bu/hr harvesting rate DR = potential drying rate in bu/hr HTIME = time that harvesting occurs (hr) PCAP = capacity of pit (bu) *Note: this assumes that it will be empty each day

  7. Advantages:  Reach out of the way locations  well suited for flat storage facilities  dust and shoveling are minimized  mechanical parts are at ground level  units are self cleaning & safer to operate Disadvantages:  energy requirements are higher  almost always tractor PTO driven  almost always more noise  damage occurs to grain above 4,000 ft./min Pneumatic conveyers

  8. Pneumatic conveyers • Types- •  positive • negative •  combination

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