Canopy air curtain (CAC) technology has been developed by the National Institute for Occupational Safety and Health (NIOSH) for use on continuous miners and subsequently roof bolting machines in underground coal mines to protect operators of these machines from overexposure to respirable coal mine dust. The next logical progression is to develop a CAC for shuttle cars to protect operators from the same overexposures. NIOSH awarded a contract to Marshall University and J.H. Fletcher to develop the shuttle car CAC. NIOSH conducted laboratory testing to determine the dust control efficiency of the shuttle car CAC. Testing was conducted on two different cab configurations: a center drive similar to that on a Joy 10SC32AA cab model and an end drive similar to that on a Joy 10SC32AB cab model. Three different ventilation velocities were tested-0.61, 2.0, 4.3 m/s (120, 400, and 850 fpm). The lowest, 0.61 m/s (120 fpm), represented the ventilation velocity encountered during loading by the continuous miner, while the 4.3 m/s (850 fpm) velocity represented ventilation velocity airflow over the shuttle car while tramming against ventilation airflow. Test results showed an average of the dust control efficiencies ranging from 74 to 83% for 0.61 m/s (120 fpm), 39%-43% for 2.0 m/s (400 fpm), and 6%-16% for 4.3 m/s (850 fpm). Incorporating an airflow spoiler to the shuttle car CAC design and placing the CAC so that it is located 22.86 cm (9 in.) forward of the operator improved the dust control efficiency to 51%-55% for 4.3 m/s (850 fpm) with minimal impact on dust control efficiencies for lower ventilation velocities. These laboratory tests demonstrate that the newly developed shuttle car CAC has the potential to successfully protect shuttle car operators from coal mine respirable dust overexposures.

中文翻译：

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用于控制可吸入煤矿粉尘的穿梭车顶篷气幕的实验室测试。

顶篷气幕 (CAC) 技术由美国国家职业安全与健康研究所 (NIOSH) 开发，用于连续采煤机以及随后的地下煤矿顶板锚杆机，以保护这些机器的操作员免于过度暴露于可吸入煤矿粉尘。下一个合乎逻辑的进展是为穿梭车开发 CAC，以保护操作员免受同样的过度暴露。NIOSH 向马歇尔大学和 JH Fletcher 授予了开发穿梭车 CAC 的合同。NIOSH 进行了实验室测试，以确定穿梭车 CAC 的粉尘控制效率。测试在两种不同的驾驶室配置上进行：与 Joy 10SC32AA 驾驶室型号类似的中心驱动器和与 Joy 10SC32AB 驾驶室型号类似的端部驱动器。测试了三种不同的通风速度：0.61、2.0、4.3 m/s（120、400 和 850 fpm）。最低的 0.61 m/s (120 fpm) 代表连续采矿机装载过程中遇到的通风速度，而 4.3 m/s (850 fpm) 的速度代表穿梭车上的通风速度，同时逆着通风气流行驶。测试结果显示，0.61 m/s (120 fpm) 的平均防尘效率为 74 至 83%，2.0 m/s (400 fpm) 的平均防尘效率为 39%-43%，4.3 m 的平均防尘效率为 6%-16% /秒（850 英尺/分钟）。在穿梭车 CAC 设计中加入气流扰流板，并将 CAC 放置在操作员前方 22.86 厘米（9 英寸）处，将灰尘控制效率提高到 51%-55%，速度为 4.3 m/s (850 fpm)较低的通风速度对粉尘控制效率的影响最小。这些实验室测试表明，新开发的穿梭车 CAC 有潜力成功保护穿梭车操作员免受煤矿呼吸性粉尘过度暴露的影响。