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Mining Publication: A Dual Sprocket Chain as a Noise Control for a Continuous Mining Machine

NOTE: This page is archived for historical purposes and is no longer being maintained or updated.

Original creation date: September 2009

Image of publication A Dual Sprocket Chain as a Noise Control for a Continuous Mining Machine

Over-exposure to noise remains a widespread, serious health hazard in the U.S. mining industry despite 25 years of regulation. Most other categories of illnesses and injuries associated with mining have improved, with the exception of hearing loss. In order to reduce cases of Noise Induced Hearing Loss (NIHL) in the mining industry, retrofit acoustic treatments and controls are being developed to subdue noise at the source. The Mine Safety and Health Administration (MSHA) coal noise sample data collected from 2000 to 2005 has determined that continuous mining machines rank first among all mining equipment whose operators exceed 100% noise dosage. The continuous mining machine conveyor, used to move coal from the cutting face to the rear of the machine, has been identified as a dominant noise source. A dual sprocket conveyor chain was tested as a potential solution. Sound power level measurements conducted at the Pittsburgh Research Laboratory (PRL) accredited reverberation chamber showed a 3 dB reduction in the A-weighted sound power level when the dual sprocket chain was implemented. Underground results show an 8-hour TimeWeightedAverage (TWA8 hrs) reduction a 3 dB for continuous mining machine operators. Utilizing this newly developed noise control, along with previously proven controls, provides continuous mining machine operators an opportunity to be within the MSHA-Permissible Exposure Limit (MSHA-PEL).

Authors: AK Smith, PG Kovalchik, LA Alcorn, RJ Matetic

Peer Reviewed Journal Article - September 2009

NIOSHTIC2 Number: 20036103

Noise Control Eng J 2009 Sep; 57(5):413-419

Conference Paper - October 2007

NIOSHTIC2 Number: 20032794

NOISE-CON 2007, Reno, Nevada, October 22-24, 2007. Burroughs C; Hambric S; Conlon S; Maling G, eds., Ames, IA: Institute of Noise Control Engineering of the USA, 2007; :1-9