Diese Präsentation wurde erfolgreich gemeldet.
Wir verwenden Ihre LinkedIn Profilangaben und Informationen zu Ihren Aktivitäten, um Anzeigen zu personalisieren und Ihnen relevantere Inhalte anzuzeigen. Sie können Ihre Anzeigeneinstellungen jederzeit ändern.

Drilling mining

1.575 Aufrufe

Veröffentlicht am

Drilling mining

Veröffentlicht in: Ingenieurwesen
  • Loggen Sie sich ein, um Kommentare anzuzeigen.

Drilling mining

  1. 1. Drilling in Mining Engineering
  2. 2. • In order to create an opening in a rock massIn order to create an opening in a rock mass DRILLING is the basic requirement.DRILLING is the basic requirement.
  3. 3. Range & Selection of Drill JumbosRange & Selection of Drill Jumbos ……………….for every Tunnel section.for every Tunnel section
  4. 4. Single Boom JumbosSingle Boom Jumbos
  5. 5. Two Boom Jumbos (8 - 45 sq.m.)Two Boom Jumbos (8 - 45 sq.m.)
  6. 6. Two Boom with basket (8 - 90 sq.m.)Two Boom with basket (8 - 90 sq.m.)
  7. 7. Three Boom/Three Boom with Basket BoomThree Boom/Three Boom with Basket Boom (upto 168 sq.m.)(upto 168 sq.m.)
  8. 8. Probing aheadProbing ahead
  9. 9. Drill Jumbo - Long HolesDrill Jumbo - Long Holes
  10. 10. • Optional equipmentOptional equipment
  11. 11. BasicBasic requirementrequirement for rock drillingfor rock drilling
  12. 12. Rock Drilling -Rock Drilling - PrinciplePrinciple Basic requirement :
  13. 13. Rock drill mechanismRock drill mechanism ImpactImpact The piston transmits theThe piston transmits the impact energy through theimpact energy through the drill steel to the holedrill steel to the hole bottom. A valve directs thebottom. A valve directs the compressed air / hydrauliccompressed air / hydraulic oil from one side to theoil from one side to the other of the piston so thatother of the piston so that it moves up and down.it moves up and down.
  14. 14. Impact
  15. 15. RotationRotation The drill steel is turned lightly with eachThe drill steel is turned lightly with each blow.blow. IN PNUEMATIC ROCK DRILLS :IN PNUEMATIC ROCK DRILLS : The rotation is normally anti-clock wiseThe rotation is normally anti-clock wise and normally made on the returnand normally made on the return stroke of the piston.stroke of the piston. The theoretical angle of rotation perThe theoretical angle of rotation per stroke is 36 degree. In practice it is 30stroke is 36 degree. In practice it is 30 degree. The difference is due todegree. The difference is due to mating part.mating part. IN HYDRAULIC ROCK DRILLS :IN HYDRAULIC ROCK DRILLS : Hydraulic motor is normally used forHydraulic motor is normally used for rotation. The rpm of the drill bit isrotation. The rpm of the drill bit is adjusted as per drill bit diameter.adjusted as per drill bit diameter. Rock drill mechanismRock drill mechanism
  16. 16. Rock drill mechanismRock drill mechanism Feed forceFeed force The feed force is created by hand inThe feed force is created by hand in case of hand held drills , Pusher legcase of hand held drills , Pusher leg or hydraulic cylinder.or hydraulic cylinder. Proper feed force will give the bestProper feed force will give the best penetration rate.penetration rate. Improper feed force will cause:Improper feed force will cause:  Loosening / damaging of thread.Loosening / damaging of thread.  Overheating / low life of drill string.Overheating / low life of drill string.  Diverted hole / poor pull in blasting.Diverted hole / poor pull in blasting.
  17. 17. Rock drill mechanismRock drill mechanism FlushingFlushing Flushing is doneFlushing is done normally by air ornormally by air or water on all the rockwater on all the rock drills used indrills used in underground, waterunderground, water is used as flushingis used as flushing media. Optimummedia. Optimum flushing will provideflushing will provide better penetrationbetter penetration rate.rate.
  18. 18. Factors which influence drilling rateFactors which influence drilling rate • Type of rockType of rock • Air pressure/Hydraulic PressureAir pressure/Hydraulic Pressure • Bit sizeBit size • Bit conditionBit condition • FlushingFlushing • Feed forceFeed force • Wear of front of rotation chuckWear of front of rotation chuck bushingbushing
  19. 19. Drifter - Heart of DrillingDrifter - Heart of Drilling JumboJumbo
  20. 20. New Generation Rock Drill
  21. 21. Components of HydraulicComponents of Hydraulic DrifterDrifter  Shank AdapterShank Adapter  Flushing HeadFlushing Head  Damping PistonDamping Piston  Stroke SelectorStroke Selector  PistonPiston  Rotation GearsRotation Gears  CylinderCylinder  AccumulatorsAccumulators  Hyd. Rotation MotorHyd. Rotation Motor
  22. 22. DriverDriver  Transmit rotation from Hyd.Transmit rotation from Hyd. Motor to Shank AdapterMotor to Shank Adapter  Triangular in shapedTriangular in shaped  Housed in rotation chuckHoused in rotation chuck  Has internal splinesHas internal splines  Made of bronze/SteelMade of bronze/Steel  Splines wear limit is half itSplines wear limit is half it original width.original width.
  23. 23. Stop RingStop Ring  Serves as retainer for ShankServes as retainer for Shank AdapterAdapter  Stop Ring is extremely hardStop Ring is extremely hard and wear resistantand wear resistant  It is subject to impactIt is subject to impact energyenergy  Wear limit is 1 mm to theWear limit is 1 mm to the front end of the splinesfront end of the splines
  24. 24. Damping PistonDamping Piston  Damping Piston protects theDamping Piston protects the Rock Drill from shockRock Drill from shock waves (thru hydraulicwaves (thru hydraulic pressure)pressure)  Subject to powerful axialSubject to powerful axial shock waves.shock waves.  It helps in absorbing reflexIt helps in absorbing reflex shocks upto 20 tonnes.shocks upto 20 tonnes.  Since it is pressed againstSince it is pressed against rot.chuck/shank adapter, itrot.chuck/shank adapter, it tends to partially rotate.tends to partially rotate.
  25. 25. Side BoltsSide Bolts  Two long side bolts holdTwo long side bolts hold together the external parts oftogether the external parts of the Rock Drill (front head,the Rock Drill (front head, cover, gear housing, interm.cover, gear housing, interm. part and cylinderpart and cylinder  Third long side boltsThird long side bolts connect all above partsconnect all above parts except front head.except front head.  Two long side bolts haveTwo long side bolts have have integral eccentrichave integral eccentric lugs(for tightening)lugs(for tightening)
  26. 26. Side BoltsSide Bolts  Tension of the side boltsTension of the side bolts must be checkedmust be checked regularly.regularly.  Rear dome nuts areRear dome nuts are tightened as per thetightened as per the recommended torquerecommended torque  Recommended toRecommended to change both the boltschange both the bolts together.together.
  27. 27. Piston GuidesPiston Guides  Front and Rear pistonFront and Rear piston guides located on either endguides located on either end of the cylinder guides theof the cylinder guides the lateral movement of thelateral movement of the piston.piston.  It prevents the piston landsIt prevents the piston lands from touching the cylinderfrom touching the cylinder  Its has wear resistant qualityIts has wear resistant quality and also gives lowestand also gives lowest possible friction.possible friction.
  28. 28. Impact PistonImpact Piston  The piston strikes the shankThe piston strikes the shank adapter between 3000 –adapter between 3000 – 3600 stokes per minute3600 stokes per minute  Piston is supported byPiston is supported by piston guides.piston guides.  Slim piston design transferSlim piston design transfer optimum energy to the drilloptimum energy to the drill stringstring  Slim piston design also hasSlim piston design also has low stress on Rock Toolslow stress on Rock Tools
  29. 29. Rotation Chuck SleeveRotation Chuck Sleeve  Rotation Chuck sleeveRotation Chuck sleeve is a press fitted into theis a press fitted into the rear of the Rotationrear of the Rotation ChuckChuck  It is made of highIt is made of high quality bronze with highquality bronze with high resistance to wear andresistance to wear and frictionfriction
  30. 30. Rotation Chuck BushingRotation Chuck Bushing  The smaller front face of theThe smaller front face of the Rotation Chuck bushingRotation Chuck bushing acts on the shank adapter.acts on the shank adapter.  Larger rear face is subject toLarger rear face is subject to the thrust from the dampingthe thrust from the damping piston.piston.  Front face of the rotationFront face of the rotation chuck bushing is subject tochuck bushing is subject to steady wear.steady wear.  Max. permissible wear onMax. permissible wear on the front face of the rotationthe front face of the rotation chuck bushing is 1 mm.chuck bushing is 1 mm.
  31. 31. Flushing HeadFlushing Head
  32. 32. Rock Drill - ReflexRock Drill - Reflex Hydraulic Rock Drills normally work at 200 BarHydraulic Rock Drills normally work at 200 Bar Impact PressureImpact Pressure Every Impact of the Rock DrillEvery Impact of the Rock Drill – Generates 20 Ton Reaction / Reflex from RockGenerates 20 Ton Reaction / Reflex from Rock Reflex 20 Ton Drifter Impact
  33. 33. Drifter without ReflexDrifter without Reflex DampenerDampener
  34. 34. Reflex kills the Drifter &Reflex kills the Drifter & MountingMounting
  35. 35. Most effective ReflexMost effective Reflex DampenerDampener
  36. 36. CARE & MAINTENANCECARE & MAINTENANCE ofof HYDRAULIC DRIFTERSHYDRAULIC DRIFTERS
  37. 37. SAFETY REGULATIONSSAFETY REGULATIONS  Special attention must be paid to safety informationSpecial attention must be paid to safety information and especially to the warning symbol (triangle).and especially to the warning symbol (triangle).  Never attempt maintenance of Rock Drill when theNever attempt maintenance of Rock Drill when the hydraulic system is pressurisedhydraulic system is pressurised  Always use correct specification hoses, specially theAlways use correct specification hoses, specially the impact hose of rating SAE 100 R9R/4SH/4SP (4 layers,impact hose of rating SAE 100 R9R/4SH/4SP (4 layers, spirally wound steel wire braided).spirally wound steel wire braided).  Use protective plugs when dismantling the Rock DrillUse protective plugs when dismantling the Rock Drill  Always overhaul a Rock Drill in a Container or a cleanAlways overhaul a Rock Drill in a Container or a clean workshopworkshop
  38. 38. Start UpStart Up  Before starting up a new or a newly overhauled RockBefore starting up a new or a newly overhauled Rock Drill:Drill:  Connect up all hydraulic hosesConnect up all hydraulic hoses  Charge the Accumulators with Nitrogen gas to theCharge the Accumulators with Nitrogen gas to the correct pressurecorrect pressure  Fill correct hydraulic and lubricating oilFill correct hydraulic and lubricating oil  Adjust correct lubricating systemAdjust correct lubricating system  Tighten all threaded joints after first shift of operationTighten all threaded joints after first shift of operation
  39. 39. Every ShiftEvery Shift  CheckCheck that Air & Lubricating oil come outthat Air & Lubricating oil come out between the shank adapter and front guidebetween the shank adapter and front guide  Check S/Adapter threads are not damagedCheck S/Adapter threads are not damaged  Keep an eye on the hydraulic hose vibration.Keep an eye on the hydraulic hose vibration. If they vibrate too much check theIf they vibrate too much check the Accumulators.Accumulators.  Check there is no leakage from the RockCheck there is no leakage from the Rock Drill. If flushing water leaks from the holeDrill. If flushing water leaks from the hole in the front head, change the seals.in the front head, change the seals.
  40. 40. Every 40 Percussion HourEvery 40 Percussion Hour Grease the Gear HousingGrease the Gear Housing Tighten all threaded joints as perTighten all threaded joints as per specified torque.specified torque. Check for external leakage on the RockCheck for external leakage on the Rock Drill. Replace the seals if leakingDrill. Replace the seals if leaking Check condition of hydraulic hoses,Check condition of hydraulic hoses, replace damaged/defective hoses.replace damaged/defective hoses.
  41. 41. Every 400 Percussion HourEvery 400 Percussion Hour Recommended for completeRecommended for complete overhaul.overhaul. Overhauling to be done in a cleanOverhauling to be done in a clean and suitable workshop. Always useand suitable workshop. Always use Hydraulic Drifter Repair Tools.Hydraulic Drifter Repair Tools.
  42. 42. AccumulatorsAccumulators Accumulators are fitted withAccumulators are fitted with safety labelssafety labels They should be charged withThey should be charged with Nitrogen gas only (other gas canNitrogen gas only (other gas can cause explosion)cause explosion) All new accumulators are notAll new accumulators are not chargedcharged
  43. 43. Charging the AccumulatorsCharging the Accumulators  Remove the protective plugsRemove the protective plugs  Open the valve nut and connect the charging hoseOpen the valve nut and connect the charging hose  Open the gas valve on the cylinderOpen the gas valve on the cylinder  Charge the Accumulator to the collaring pressureCharge the Accumulator to the collaring pressure minus 30 bar. However the maximum pressureminus 30 bar. However the maximum pressure should not exceed 110 barshould not exceed 110 bar  Tighten the valve nut and also close the cylinderTighten the valve nut and also close the cylinder valve.valve.  Remove the charging hose and fit back theRemove the charging hose and fit back the protective cap on the accumulator valveprotective cap on the accumulator valve
  44. 44. AccumulatorsAccumulators Intake : 30 bar below collaring pressure Max - 110 bar Damping : 20-25 bar Return : Not to be charged
  45. 45. MAIN COMPONENTS OF DRILL JUMBOS • CARRIER • BOOM • FEED • ROCK DRILL • POWER PACK
  46. 46. Carrier
  47. 47. Power train
  48. 48. Carrier System CARE & MAINTENANCE
  49. 49. Engine – Air Filter 1.Clean every week 2.Change interval normally depends on environment
  50. 50. Engine – Oil & Filter Change interval depends on different factors: a. Quality of oil b. Working temp c. Environment
  51. 51. Engine – Fuel Filter Change interval normally depends on quality of fuel
  52. 52. Carrier GreasingGrease every week. Check once in every month whether grease is passing through every point
  53. 53. Drive line : greasing Grease every point once in a week. Only two stroke of grease is sufficient. Use good quality grease. Check bolt torque weekly
  54. 54. Coolant Level Check Coolant level daily
  55. 55. Transmission Oil & Filter Change interval depends on different factors: a. Quality of oil b. Working temp c. Environment
  56. 56. Transmission oil change A - Filling B - Drain C - Filter the oil when it is hot through drain plug “B”. e oil through port “A” up to “LOW” mark on dipstick. e the filter. he engine at low idle to fill up the converter and fill oil up to low mark. he engine to heat up the oil at 80 deg. C fill up to high level.
  57. 57. Differential Check level every week Change every 500 hours
  58. 58. Planetary hub Check level every week Change every 500 hours
  59. 59. Release Park brake Loosen lock nut “A” Screw in stud “B” to the bottom. To reset the park brake screw out the stud “B” to 47 mm. Tighten the lock nut.
  60. 60. Service brake adjustment Place the rig on jacks. Open the lock nut “A” & lock plate “B”. Unscrew the adjusting screw “C” anticlockwise to take up any play. Continue to turn until a torque of 40 Nm is attained. Now screw the adjusting screw “C” clockwise 3 turns. Refit lock plate “B” & lock nut “A”.
  61. 61. Hydraulic Booms
  62. 62. A B C
  63. 63. Cross cut drilling
  64. 64. Hydraulic Booms
  65. 65. Rotati on unit
  66. 66. Boom Hydrau
  67. 67. Cylinder movement - Vertical
  68. 68. Cylinder movement - Horizontal
  69. 69. Mainten nce
  70. 70. Adjustment - Feed cradle
  71. 71. Cradle clearance adjustment
  72. 72. Replacement of guide rail
  73. 73. In Conclusion…. Drilling is the backbone of all mining & tunneling applications & thus the role of Electro Hydraulic Drill Jumbos assumes critical proportions. While these equipment are quite simple to operate with built in ling term reliability, optimization of

×