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Development of a Prototype Retrofit Noise Control Treatment for Jumbo Drills.
NTIS: PB/83-218800 :106 pages
The noise and vibration levels of four jumbo drills were characterized and a survey of percussive rock drill usage is reported. A Gardner-Denver DH 123 drill was chosen as a demonstration drill, and extensive noise diagnostic studies were performed. Noise control treatments were designed, developed, and evaluated in a reverberant drill test facility. The treatments consisted of an integral enclosure-muffler for the drifter, vibration isolation of the drifter from the enclosure and feed, and a drill steel sheath. A 19-dba reduction in overall sound power level was achieved with no loss in drilling rate. The prototype retrofit treatments were field tested in an aboveground mine and in a production section of an underground zinc mine. Long-term durability and operator acceptance of the enclosure-muffler treatment were excellent. Preliminary evaluation of the drill steel sheath was encouraging, although additional testing is required.
CP; Final Contract Report;
NTIS Accession No.
Bolt Beranek and Newman Inc.
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division