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Field Loading Configurations

Field Loading Configurations. ©Dr. B. C. Paul 2000. Field Loading Configurations. Depends on the type of equipment used On the space available Shovels and Hydraulic Excavators tend to load in one set of ways Backhoes have some variations FEL have some unique ones. Single Truck Loading.

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Field Loading Configurations

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  1. Field Loading Configurations ©Dr. B. C. Paul 2000

  2. Field Loading Configurations • Depends on the type of equipment used • On the space available • Shovels and Hydraulic Excavators tend to load in one set of ways • Backhoes have some variations • FEL have some unique ones

  3. Single Truck Loading Loader near the face Truck backs up next to the loader on the drivers side (Gives the loader operator a better view Loader working into cut in the face Loader swings about 120 degrees to dump

  4. Advantages of Single Truck Loading • Simple • Truck doesn’t have to back tires into the rockiest areas • The shovel faces armor of the tracks into the dig face • Shovel operator has optimized view of truck bed target

  5. Disadvantages of Single Truck Loading • Backing into place can take around 1 minute and may require a spotter • Loaders expensive and idle • Back time is an unproductive bottleneck • Can form large ques because trucks tend to bunch • 120 degree swing angle can be slow • Manufactures often rate on 90 degree

  6. More Disadvantages • Limited Space Available for Oversize Material • Can set to side • Do a bowling ball drop into truck • Hydraulic shovels can set - but cable shovels drop bucket bottom open • Extension cord problems with electric equipment • Cord has to cut across truck path • Putting on poles can cost time

  7. Double Truck Loading Same Arrangement as single truck loading only the trucks pull up on both side

  8. Advantages of Double Truck Loading • Second Loading Spot Allows a second truck to spot during loading operations • Avoids dead time on the loader • Doesn’t help the truck cycle time other than eliminating some queing

  9. Disadvantages of Double Truck Loading • Still have extension cord problems on electric units • Oversize boulder problem is now even more severe • Forces Loader operator to load on the blind side (most big loaders put the cab to one side of equipment)

  10. Drive By Truck Loading Shovel Lines up Along the face Trucks pull forward and stop beside the loader Shovel Swings 90 to 180 degrees to dump

  11. Advantages to Truck Drive-By • Greatly Reduced Spotting Time - no backing cycle • Cable doesn’t cross the Trucks Path • Can Set Oversize Beside and out of the way • Machine marches on a steady forward advance • Can do in a narrower space

  12. Disadvantages of Drive -By • Often have problems with dipper swinging over the top of the drivers cab • Loader gets revenge for the truck running over its extension cord • If the dipper comes open your truck driver can get dead • Trucks get to drive those expensive tires through spills

  13. More Disadvantages • Lack of spotting makes it a one shot that can lead to long swings • Tracks are broadside to long face area

  14. Modified Drive-By (Or Getting Fancy) • Shovel in Drive-By Position • Truck Drives up to Shovel as if it was a drive-by • Loading drops onto a moving target • While the Loading goes for the next bite the truck backs into a single load like position • Shortens swing distance

  15. Advantages • Get most of the positioning advantages of single truck load without the idle spot time

  16. Disadvantages • Dump onto a Moving Target • With swinging over cab can be a real adventurous feeling for driver • Gets the tires into some real rocky conditions

  17. Backhoe Loading Methods • Backhoe works below grade • Can allow work to be kept off wet pit floor • can also provide multi-level loading • Backhoes generally need good size machine relative to bucket. Doesn’t wear as well - generally used for special conditions

  18. Can Work Double and Single Truck Loads

  19. Can also Load on Multiple Levels

  20. Multilevel Loading • Double Loading configuration • has extra room for oversize and still two trucks • Because truck has to come in on right level does require some additional advance data to send truck to right spot • Can also get 3 position loading • often a bit of overkill

  21. Front End Loader Configurations • FELs are less expensive than the trucks and are mobile • Makes practical to consider more than one loader providing loading service • Limited lift heights make truck match more critical • Tires can tear up bad underfoot

  22. Single Truck Loading

  23. Common Loading Arrangements • Tandom Loading • This time there are two loaders and the truck backs between • Drive By Loading

  24. Chain Loading

  25. Staggered Tandom Loading

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