P1253297833hPWrM

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NOISE SOURCE IDENTIFICATION PROJECT CONTINUOUS
MINER TEAM
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Fairchild Mining Machine

• Fairchild Model 410
• Auger Type
• Operators Compartment
• 1 Operator and no helper
• Fairchild Haulmark Continuous Haulage
• 4 Operators
• No operator compartment

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Miner Operators
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Bridge Operator Summary
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Significant Changes

• Miner operator changes positions with bridge
  operator at midshift
• Switch with 2 instead of 4
• Plexiglas Barrier
• Between operator and conveyor chain

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Dosimeter ResultsAfter Modifications
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Joy Mining Machines

• Joy 14AA CM
• Remote Control
• Scrubber Capacity 3997
• 13 Horsepower motor
• Silencer package installed in August
• 1 bridge operator

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Miner Bridge OperatorMarch 2000
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Miner Bridge OperatorJanuary 2001
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Tivar Conveyor Deck

• Joy 14 CM
• Full face miner with Integral Bolters
• Auxiliary Fans

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Noise Level Readings

• 87 dbA with fan only
• 93 dbA motors only
• 102 dbA with chain only
• Chain is dominant noise source
• 101 dbA left ear - 474 Dose
• 97 dbA right ear - 272 Dose

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Eimco Mining Machines

• 2810-2 Continuous Mining Machine
• Remote Control
• Silenced Fan Housing
• 30 HP motor
• 6000 CFM capacity

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Miner Operators
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Bridge Operators Summary
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Significant Findings

• Mining 96 - 99 dBA with scrubber
• Scrubber exhaust 102 dBA

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Scrubbers

• Sleeve style attenuator
• 30 or 40 HP only
• Bolt on attenuator
• Foam wrap on deflector
• Foam wrap around housing
• 30 or 40 HP only
• Silenced fan housing
• Proper fan blade clearance

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Auxiliary Fans

• Silencers
• Enclose fans as much as possible
• Tubing maintenance
• Holes
• Loose connections

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Continuous Mining MachineConclusions

• Chain conveyor is primary source of noise
• Scrubber is secondary source of noise
• Insulation of motors and pumps show limited
  results
• Replace bent conveyor flights or sides
• Proper operator positioning
• Barriers where possible

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Future Work

• Coated conveyor flights
• with Consol, Joy, NIOSH
• Scrubbers with crossover ductwork
• Initial survey conducted 2/14/01