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MC 279 HANDOUT

Page 13

  • Shovel Production Estimation

    • Formula for estimating production rate of a shovel Q (m3/hr) provided.

    • Example calculation given for determining hourly production of a 4m3 power shovel.

      • Cycle time, swell factor, dipper fill factor, availability, and utilization considered in the calculation.

      • Hourly production of shovel calculated in bank m3 and loose m3.

Page 14

  • Hydraulic Excavators

    • Introduction of hydraulic excavators in the 1970s in the Surface Mining Industry.

    • Two basic machine configurations: hydraulic shovel and hydraulic backhoe.

    • General characteristics of hydraulic excavators listed.

      • Bucket capacities, machine weight, power ranges, mobility, gradeability, swing speeds, breakout force, and service life mentioned.

    • Comparison of characteristics between shovel and backhoe provided in a table.

Page 15

  • Basic Machine Operation

    • Description of the primary use of hydraulic excavators for excavating and loading.

    • Operation cycle outlined: cutting, swing loaded, dump, swing empty back to face.

    • Propelling, crowding, hoisting motion, and bucket rotation explained.

    • Bucket design differences between hydraulic shovel and backhoe discussed.

Page 16

  • Applications of Hydraulic Excavator

    • Main uses of shovel/backhoe: loading trucks and hoppers/crushers, overburden removal, coal/ore loading, cutting trenches.

    • Distinction in digging capabilities between shovel and backhoe highlighted.

    • Various applications of backhoe in different scenarios described.

Page 17

  • Comparison of Digging Motions

    • Comparison of digging motions of front-end loader, power shovel, and hydraulic shovel presented in a figure.

Page 18

  • Comparison of Digging Motions

    • Continued comparison of digging

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MC 279 HANDOUT

Page 13

  • Shovel Production Estimation

    • Formula for estimating production rate of a shovel Q (m3/hr) provided.

    • Example calculation given for determining hourly production of a 4m3 power shovel.

      • Cycle time, swell factor, dipper fill factor, availability, and utilization considered in the calculation.

      • Hourly production of shovel calculated in bank m3 and loose m3.

Page 14

  • Hydraulic Excavators

    • Introduction of hydraulic excavators in the 1970s in the Surface Mining Industry.

    • Two basic machine configurations: hydraulic shovel and hydraulic backhoe.

    • General characteristics of hydraulic excavators listed.

      • Bucket capacities, machine weight, power ranges, mobility, gradeability, swing speeds, breakout force, and service life mentioned.

    • Comparison of characteristics between shovel and backhoe provided in a table.

Page 15

  • Basic Machine Operation

    • Description of the primary use of hydraulic excavators for excavating and loading.

    • Operation cycle outlined: cutting, swing loaded, dump, swing empty back to face.

    • Propelling, crowding, hoisting motion, and bucket rotation explained.

    • Bucket design differences between hydraulic shovel and backhoe discussed.

Page 16

  • Applications of Hydraulic Excavator

    • Main uses of shovel/backhoe: loading trucks and hoppers/crushers, overburden removal, coal/ore loading, cutting trenches.

    • Distinction in digging capabilities between shovel and backhoe highlighted.

    • Various applications of backhoe in different scenarios described.

Page 17

  • Comparison of Digging Motions

    • Comparison of digging motions of front-end loader, power shovel, and hydraulic shovel presented in a figure.

Page 18

  • Comparison of Digging Motions

    • Continued comparison of digging

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