Reed W R, Zheng Y, Yekich M, Ross G, Salem A
Pittsburgh Mining Research Division, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, 626 Cochrans Mill Rd., Pittsburgh, PA 15236, USA.
J.H. Fletcher, Inc., Huntington, WV, USA.
Int J Coal Sci Technol. 2018 Sep;10(3):1007. doi: 10.1007/s40789-018-0225-2.
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.
美国国家职业安全与健康研究所（NIOSH）开发了风筒气幕（CAC）技术，用于地下煤矿的连续采煤机以及后续的锚杆支护机，以保护这些机器的操作人员避免过度暴露于可吸入的煤矿粉尘中。接下来合理的进展是为梭车开发一种风筒气幕，以保护操作人员免受同样的过度暴露。NIOSH授予马歇尔大学和J.H. 弗莱彻公司一份合同，开发梭车风筒气幕。NIOSH进行了实验室测试，以确定梭车风筒气幕的粉尘控制效率。测试针对两种不同的驾驶室配置进行：一种是类似于乔伊10SC32AA驾驶室型号的中央驱动，另一种是类似于乔伊10SC32AB驾驶室型号的端部驱动。测试了三种不同的通风速度——0.61、2.0、4.3米/秒（120、400和850英尺/分钟）。最低的0.61米/秒（120英尺/分钟）代表连续采煤机装载过程中遇到的通风速度，而4.3米/秒（850英尺/分钟）的速度代表梭车逆着通风气流行驶时通风气流在梭车上的流速。测试结果显示，对于0.61米/秒（120英尺/分钟），粉尘控制效率平均为74%至83%；对于2.0米/秒（4×00英尺/分钟），为39% - 43%；对于4.3米/秒（850英尺/分钟），为6% - 16%。在梭车风筒气幕设计中加入气流扰流器，并将风筒气幕放置在操作人员前方22.86厘米（9英寸）处，对于4.3米/秒（850英尺/分钟）的情况，粉尘控制效率提高到了51% - 55%，而对较低通风速度下的粉尘控制效率影响最小。这些实验室测试表明，新开发的梭车风筒气幕有潜力成功保护梭车操作人员免受煤矿可吸入粉尘的过度暴露。
