Noise Reduction of Conveyers Used in Underground Coal Mining Machinery.

摘要

Discussions are presented of the three phases of the noise reduction program on flight-type coal conveyors. The three phases are identification of noise sources,evaluation of potential noise reduction concepts,and implementation of noise reduction,which is intended to reduce conveyor noise to less than 90dB(A) in the underground mining environment. The major noise sources are impacts of the chain on the tail roller and on the top and bottom decks. A total noise reduction of 11dB(A) was achieved by using techniques which are applicable to retrofit. A theoretical model of isolation provided by the isolated tail roller is developed. Appendices are presented that contain information on other potential concepts and additional data generated.