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Lecture 22

Lecture 22. Harvest Efficiency . Cycle-Time Equipment Selection.

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Lecture 22

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  1. Lecture 22 Harvest Efficiency

  2. Cycle-Time Equipment Selection 1.   Determine design capacity 2.   Isolate each step in the process 3.   Identify the equipment needed for each activity and labor, then compute ownership and purchase costs 4.   Determine number of pieces required using the equation:  # items = design capacity per unit of time          Capacity /unit of time / item 5. Compute total purchase & ownership costs 6. Select equipment based on ownership & /or purchase cost.  Formula for design efficiency(%)  DE (%) =   design capacity * 100       actual capacity Table 7.2

  3. Techniques to Minimize Harvesting Bottlenecks • Combine selection • Determine desired harvest rate • Daily rate = total acres * yield in bu/acre      Actual days to harvest • ie - 300 acres @ 100 bu/acre & 20 days = 1,500 bu

  4. How to determine efficiency of a combine... • unloading time • turning time •  rest breaks •  fill time •  other (ie.  Down time - not in book) • All must be subtracted to determine % efficiency

  5. Delivery Vehicle Selection • Single stage - truck dumps • Two stage - dumped in grain wagon      dumped in truck (rice) • Multi-wagon transport • Issues that impact delivery vehicles • position time under combine • time to unload combine • time to relocate vehicle • travel time to grain facility • time to sample and weigh grain • time waiting to unload • travel time back to combine • Misc... breaks, downtime...

  6. Keep in Mind • In general •   combine most costly, it should not wait •   better to have smaller truck.... •   able to receive an EVEN number of dumps •   min size = largest hopper size •   most expensive wet holding facility • • Pit or Hopper & bucket elevator or port. auger

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