noise attenuation devices in pneumatic rock drilling … · pneumatic rock drilling machines t . l...

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 thando.sibindi@tranterholdings.co.za

W.J.MurrayDesign EngineerTranter RockdrillsPhone 011 761 2234Mobile 083 792 7841e mail wmurray@tranterrockdrills.co.za

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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5

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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