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Evaluations of a noise control for roof bolting machines.

Authors
Azman-AS; Yantek-DS; Alcorn-LA
Source
Min Eng 2012 Dec; 64(12):64-70
NIOSHTIC No.
20041865
Abstract
In collaboration with Kennametal Inc. and Corry Rubber Corporation, the U.S. National Institute for Occupational Safety and Health (NIOSH) developed a drill bit isolator to address noise overexposures associated with roof bolting machines in underground coal mines. NIOSH laboratory studies confirmed that the drill bit isolator reduces noise during drilling. Field studies were needed to confirm that a noise reduction could be obtained under working conditions and that the device was sufficiently durable. This paper reports results of field tests of the device conducted at five underground coal mines. Noise reduction was assessed by comparing the operator's noise exposure during drilling with and without the drill bit isolator. Durability was assessed by recording the number of holes and total feet drilled with each bit isolator until either the test period ended or the device failed. The results from these tests showed that the device is an effective noise control in a mine environment. The field-tested drill bit isolators provided a noise reduction of 3-5 dB(A). Of nine devices tested for durability, five exceeded 610 m (2,000 ft) drilled and two exceeded 762 m (2,500 ft) drilled before failure. Durability issues found in the field tests led to final production optimizations that have resulted in a commercially available product for drilling with 35-mm- (1.3-in.-) diameter roof bits and hexagonal drill steels.
Keywords
Mining-industry; Mining-equipment; Underground-mining; Noise; Noise-control; Control-technology; Engineering-controls; Coal-mining
CODEN
MIENAB
Publication Date
20121201
Document Type
Journal Article
Fiscal Year
2013
NTIS Accession No.
NTIS Price
Identifying No.
B20121218D
Issue of Publication
12
ISSN
0026-5187
NIOSH Division
OMSHR
Priority Area
Mining
Source Name
Mining Engineering
State
PA
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