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Evaluations of noise controls for roof bolting machines used to drill 25-mm-diameter holes.

Authors
Yantek-DS; Alcorn-LA; Azman-AS
Source
NOISE-CON 2011. The 25th Conference of the Institute of Noise Control Engineering, July 25 - 27 2011, Portland, Oregon. Washington, DC: The Institute of Noise Control Engineering of the USA, 2011 Jul; :1-15
NIOSHTIC No.
20039493
Abstract
Roof bolting machine (RBM) noise is a significant health hazard in underground mining because the sound levels at the operator's station often exceed 100 dB(A). Drilling the hole prior to installing a roof bolt is the most significant source of RBM operator noise exposure. The dominant source of drilling noise is the drill steel. A drill bit isolator (BISO) for 25- mm-diameter drilling has been developed to reduce the noise radiated by the drill steel during the drilling process. In addition, a rubber-barrier cover for the chuck has been evaluated. This publication discusses in-laboratory sound level measurements with the 25- mm-diameter BISO and the rubber chuck cover, and in-mine evaluations of the BISO. In the laboratory, the BISO reduced the A-weighted sound level measured near the operator's station while drilling by 5.6 dB, while the rubber-barrier chuck cover reduced the A-weighted sound level at the same location by less than 1 dB. Severe, highly variable roof conditions in the mine made it impossible to determine the effect of the BISO on the RBM operators' noise exposures. However, the in-mine testing provided information that will be used to improve the durability of the BISO.
Keywords
Noise; Noise-levels; Noise-measurement; Sound; Hearing; Ears; Mining-equipment; Mining-industry; Noise-induced-hearing-loss; Machine-tools; Machine-operators; Underground-miners; Underground-mining; Coal-miners; Coal-mining; Permissible-limits; Exposure-assessment; Exposure-levels; Exposure-limits; Equipment-operators; Tools; Equipment-design; Measurement-equipment; Laboratory-testing; Sound-analyzers; Testing-equipment; Hearing-conservation
Contact
David S. Yantek, National Institute for Occupational Safety and Health, Office of Mine Safety and Health Research, 626 Cochrans Mill Road, Pittsburgh, PA 15236
Publication Date
20110725
Document Type
Conference/Symposia Proceedings
Fiscal Year
2011
NTIS Accession No.
NTIS Price
NIOSH Division
OMSHR
Priority Area
Mining
Source Name
NOISE-CON 2011. The 25th Conference of the Institute of Noise Control Engineering, July 25 - 27 2011, Portland, Oregon
State
PA
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