Drilling mining

1. Drilling in Mining Engineering

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. Range & Selection of Drill JumbosRange & Selection of Drill Jumbos
……………….for every Tunnel section.for every Tunnel section

4. Single Boom JumbosSingle Boom Jumbos

5. Two Boom Jumbos (8 - 45 sq.m.)Two Boom Jumbos (8 - 45 sq.m.)

6. Two Boom with basket (8 - 90 sq.m.)Two Boom with basket (8 - 90 sq.m.)

7. Three Boom/Three Boom with Basket BoomThree Boom/Three Boom with Basket Boom
(upto 168 sq.m.)(upto 168 sq.m.)

8. Probing aheadProbing ahead

9. Drill Jumbo - Long HolesDrill Jumbo - Long Holes

10. • Optional equipmentOptional equipment

11. BasicBasic
requirementrequirement
for rock drillingfor rock drilling

16. Rock Drilling -Rock Drilling - PrinciplePrinciple
Basic requirement :

18. 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.

19. Impact

20. 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

21. 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.

22. 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.

23. 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

24. Drifter - Heart of DrillingDrifter - Heart of Drilling
JumboJumbo

25. New Generation Rock Drill

26. 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

27. 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.

28. 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

29. 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.

30. 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)

31. 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.

32. 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.

33. 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

34. 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

35. 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.

36. Flushing HeadFlushing Head

37. 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

38. Drifter without ReflexDrifter without Reflex
DampenerDampener

39. Reflex kills the Drifter &Reflex kills the Drifter &
MountingMounting

40. Most effective ReflexMost effective Reflex
DampenerDampener

42. CARE & MAINTENANCECARE & MAINTENANCE
ofof
HYDRAULIC DRIFTERSHYDRAULIC DRIFTERS

43. 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

44. 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

45. 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.

46. 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.

47. 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.

48. 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

49. 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

50. AccumulatorsAccumulators
Intake :
30 bar below
collaring pressure
Max - 110 bar
Damping :
20-25 bar
Return :
Not to be
charged

51. MAIN COMPONENTS OF
DRILL JUMBOS
• CARRIER
• BOOM
• FEED
• ROCK DRILL
• POWER PACK

52. Carrier

53. Power train

54. Carrier
System
CARE & MAINTENANCE

55. Engine – Air Filter
1.Clean every week
2.Change interval
normally
depends on
environment

56. Engine – Oil & Filter
Change interval
depends on
different
factors:
a. Quality of oil
b. Working temp
c. Environment

57. Engine – Fuel Filter
Change interval
normally
depends on
quality of fuel

58. Carrier GreasingGrease every week.
Check once in every month whether
grease is passing through every point

59. 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

60. Coolant Level
Check
Coolant
level daily

61. Transmission Oil & Filter
Change interval
depends on
different
factors:
a. Quality of oil
b. Working temp
c. Environment

62. 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.

63. Differential
Check level
every week
Change
every 500
hours

64. Planetary hub
Check level
every week
Change
every 500
hours

65. 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.

66. 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”.

67. Hydraulic Booms

68. A
B
C

71. Cross cut drilling

73. Hydraulic
Booms

77. Rotati
on
unit

78. Boom
Hydrau

79. Cylinder movement - Vertical

80. Cylinder movement - Horizontal

81. Mainten
nce

83. Adjustment - Feed cradle

84. Cradle clearance adjustment

85. Replacement of guide rail

86. 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