Download
trucks n.
Skip this Video
Loading SlideShow in 5 Seconds..
TRUCKS PowerPoint Presentation

TRUCKS

405 Vues Download Presentation
Télécharger la présentation

TRUCKS

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. TRUCKS

  2. TRUCKS Distance is the principal factor in selecting haul units. Feet

  3. Highway rear-dump

  4. Tractor with bottom dump trailer

  5. Bottom dump trailer deposits a wind row of material.

  6. Articulated Trucks

  7. Articulated Trucks Can operate over bad ground.

  8. Articulated Trucks Retainer plate to increase load capacity.

  9. Trucks to move the fleet

  10. Special trailers for heavy loads

  11. Service truck

  12. TIRES Tires are designed for a wide range of applications. Section 21 CAT Handbook

  13. They are BIG

  14. Safety

  15. TRUCK PRODUCTION LOAD HAUL RETURN A DUMP

  16. STEP 1 BUCKET LOADS Number of bucket loads required to fill the truck. Bucket loads must be aninteger number.

  17. MATCH THE LOADER TO THE TRUCK

  18. MATCH THE LOADER TO THE TRUCK

  19. TRUCK CAPACITY

  20. TRUCK CAPACITY Manufacturer's specification sheets will list both struck and heaped capacities. STRUCK - material measured straight across the top of the body.

  21. TRUCK CAPACITY 2 1 HEAPED - based on a 2:1 slope above hauler bodies.

  22. BUCKET CAPACITY

  23. WEIGHT LIMIT Check load weight against gravimetric capacity of the haul unit. Max. gross weight 150,000 lb Operating weight (empty) 68,900 lb Therefore the max load is 81,100 lb

  24. WEIGHT LIMIT Tires are about 35% of a truck’s operating cost. Overload a truck and you abuse the tires.

  25. The Terex Titan, the world’s largest truck at 350-ton was designed around the tires. CAT is working on a 340-ton truck.

  26. WEIGHT LIMIT Check load weight against gravimetric capacity Note the difference. Sideboards

  27. WEIGHT LIMIT Check load weight against gravimetric capacity of the haul unit.

  28. STEP 2 LOAD TIME LOAD TIME = Excavator cycle time X No. of bucket loads

  29. STEP 2 LOAD TIME

  30. STEP 3 HAUL TIME

  31. STEP 4 RETURN TIME

  32. STEP 5 DUMP TIME This will depend on the type of hauling unit. • Rear dumps must be spotted before dumping. Total dump time can exceed • 2 minutes.

  33. STEP 5 DUMP TIME • Bottom dump units dump while moving.

  34. STEP 5 DUMP TIME • PROJECT SPECIFIC FACTORS • Is the dump area smooth permitting safe maneuvering to dump.

  35. STEP 5 DUMP TIME • PROJECT SPECIFIC FACTORS • Is the dump area crowded with support equipment.

  36. STEP 5 DUMP TIME • PROJECT SPECIFIC FACTORS • Do loaded haul units have the right-of-away. Grader Roller Water truck

  37. STEP 5 DUMP TIME Turn and Dump times (min.) See p. 295

  38. STEP 6 TRUCK CYCLE TIME CYCLE TIME = Load Time + Haul Time + Dump Time + Return Time

  39. STEP 7 NUMBER OF TRUCKS REQUIRED TRUCKS REQUIRED =

  40. STEP 7 NUMBER OF TRUCKS REQUIRED Production Trucks

  41. STEP 7 NUMBER OF TRUCKS REQUIRED Truck potential Loader potential Production Match point Trucks

  42. STEP 7 NUMBER OF TRUCKS REQUIRED The match point typically does not coincide with an even number of trucks.

  43. STEP 8 EFFICIENCY • Three critical factors to consider: • Bunching • Operator • Equipment availability

  44. STEP 8 EFFICIENCY Bunching: With a perfect loader - hauler match the effect of bunching is a 10 to 20% loss. If there are extra haulers the effect is reduced as there is always a line of trucks waiting to be loaded.

  45. STEP 8 MISMATCH & BUNCHING EFFICIENCY Production Trucks

  46. STEP 8 EFFICIENCY Operator: Longer hauling distances usually results in better operator efficiency. Operator efficiency increases as haul distance increases to about 8,000 ft. after which it remains constant.

  47. STEP 8 OPERATOR EFFICIENCY Production Trucks

  48. STEP 8 EFFICIENCY Equipment availability: When the loading tool breaks down, the production drops to zero.

  49. STEP 9 PRODUCTION The Loader will control production if at least one extra truck is used. PRODUCTION (LOADER) =