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NOISE ATTENUATION NOISE ATTENUATION DEVICES INDEVICES IN
PNEUMATIC ROCK DRILLING PNEUMATIC ROCK DRILLING MACHINESMACHINES
T . L SibindiSales Marketing & Strategy DirectorTranter HoldingsPhone + 27 11 761 2200Mobile + 27 72 624 0217e mail [email protected]
W.J.MurrayDesign EngineerTranter RockdrillsPhone 011 761 2234Mobile 083 792 7841e mail [email protected]
NOISE ATTENUATION DEVICES INNOISE ATTENUATION DEVICES INPNEUMATIC ROCK DRILLING MACHINESPNEUMATIC ROCK DRILLING MACHINES
LATEST DEVELOPMENTS
EXHAUST MUFFLING IN HAND HELD DRILLS
EXHAUST MUFFLING IN LONG HOLE DRILLING MACHINES
VARIOUS SOURCES OF NOISE WHEN DRILLINGVARIOUS SOURCES OF NOISE WHEN DRILLING
1. Exhaust noise2. Mechanical noise3. Drill steel ringing4. Steel on steel on rock5. Ambient noise6. Echo
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LIGHTWEIGHT PNEUMATIC JACKHAMMER DRILLING IN SOUTH AFRICAN PLATINUM MINE STOPE.
UN-MUFFLED TYPE.
THE ANSWER IS TO “DESTRUCT” THE PULSATING EFFECT OF COMPRESSED AIR ESCAPING FROM THE EXHAUST PORT
WHAT CAN BE DONE TO ENHANCE THE MUFFLING EFFECT
COMMERCIALLY AVAILABLE FOR THE LAST 35 YEARS
CONVENTIONAL MUFFLED JACKHAMMER
BUT HOW?”
BUT HOW?”
SECTION THROUGH ROCKDRILL CYLINDER
MUFFLE BOX
EXHAUST TUBE
CYLINDER BORE
TO IMPINGE ONE JET OF PULSATING AIR AGAINST ANOTHER TO BREAK UP THE PULSES
SECTION THROUGH ONE EXHAUST TUBE
BUT HOW?”
DESIGN REQUIREMENTS OF AN DESIGN REQUIREMENTS OF AN IMPROVED MUFFLE SYSTEM.IMPROVED MUFFLE SYSTEM.
LIGHT WEIGHTBUILT IN NOT BOLT ONEFFECTIVEDOESN’T AFFECT DRILLING PERFORMANCECHEAP
THE RESULT IS “SECOND GENERATION” EXHAUST MUFFLING
CLOSE UP OF 2nd GENERATION EXHAUST MUFFLE
RESULTS AT 5 BarUNMUFLED 111 dBA2nd GENERATION MUFFLING 103 dBA
SABS 1470 part IV-1990FREE FIELD TESTING
6 POINT NOISE LEVELMEASUREMENT FOR EACH DRILL TESTED AT C.S.I.R. MINING TECH JULY 2008.
AT 5 Bar UNMUFLED 111 dBA
1m
WHAT OF LONG HOLE DRIFTER DRILLING?
THE NOISE ISSUE LONG HOLE DRILLING
S36M MUFFLED DRIFTER
DESIGN REQUIREMENTSDESIGN REQUIREMENTS
WEIGHT IS NOT AN ISSUEBUILT IN NOT BOLT ONEFFECTIVEDOESN’T AFFECT DRILLING PERFORMANCEOTHER ENHANCEMENTS
THE RESULT IS THE S36M MUFFLED DRIFTERTHE RESULT IS THE S36M MUFFLED DRIFTER
EFFECTIVE BUILT IN MUFFLING SYSTEM OF MULTIPLE SWIRL CHAMBERS AND EXHAUST TUBES
REVISED PERCUSSIVE ELEMENT CHARACTERISTICS
EXTERNAL WATER FEED
NO WATER TUBE
NUMEROUS OTHER ENHANCEMENTS
1m1m1m1m
FROMFROMFROMFROM
117 dBA117 dBA117 dBA117 dBA
totototo
108 dBA108 dBA108 dBA108 dBA
TESTING THE S36M MUFFLED DRIFTERTESTING THE S36M MUFFLED DRIFTER
TESTING THE S36M MUFFLED DRIFTERTESTING THE S36M MUFFLED DRIFTER
THE NOISE ISSUE LONG HOLE DRILLING
FROM CONCEPT TO REALITY
S36M MUFFLED DRIFTER
COMMERCIALLY AVAILABLE FROM SEPTEMBER 2008
Tranter!!!!!! Guaranteed lowest cost per metre dril led solutions