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首页> 美国政府科技报告 >Develop and Test Canopy Air Curtain Devices.
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Develop and Test Canopy Air Curtain Devices.

机译：开发和测试冠层空气幕装置。

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The research concerns the design,fabrication,and testing of canopy air curtain devices. The canopy air curtain device is designed to reduce the level of respirable dust exposure to a continuous mining machine operator in an underground coal mine,while having a minimum effect on operator safety,mobility,and comfort and being compatible with mining equipment. This research was devoted to the development of a device that uses an invisible curtain of air to envelope a mining machine operator's breathing zone with filtered air to provide respiratory protection. Various concepts were evaluated by means of laboratory tests. One 200 cfm device was selected and tested on various mining machines at underground sites. The canopy air curtain was found to be reasonably effective. The percent reductions over the ambient dust concentrations were about 30to 70percent and largely depending on the amount of time the operator spent under the air curtain.

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