Li J, DuCarme J, Reyes M, Smith A
Senior mining engineer, lead mechanical engineer (retired), team leader and deputy division director, respectively, National Institute for Occupational Safety and Health (NIOSH), Pittsburgh, PA, USA.
Min Eng. 2018 Jun;70(6):51-56. doi: 10.19150/me.8299.
A magnetic proximity detection system is mounted on a mobile mining machine to prevent underground workers from being pinned or struck by machine motion. The system generates magnetic fields around the machine to determine safe working distances. The miner-worn component measures the magnetic field in order to approximate location. Large masses of steel, such as those from mining equipment, can alter the magnetic field distribution. This affects the locational accuracy of the system, thus adversely impacting worker safety. To examine this problem, U.S. National Institute for Occupational Safety and Health researchers developed a method and test system to study the influence of a steel mass on the magnetic field distribution. The results show that a steel plate can strengthen the magnetic field perpendicular to the generator by up to 40 percent. Furthermore, they show that the degree of the influence on the field distribution is a function of distance. The results from this study can be used to further develop and improve the performance and reliability of electromagnetic proximity detection systems used in underground mining applications.
一种磁性接近检测系统安装在移动采矿设备上，以防止地下工人被机器运动挤压或撞击。该系统在机器周围产生磁场，以确定安全工作距离。矿工佩戴的部件测量磁场以估算位置。大量的钢铁，如采矿设备中的钢铁，会改变磁场分布。这会影响系统的定位精度，从而对工人安全产生不利影响。为了研究这个问题，美国国家职业安全与健康研究所的研究人员开发了一种方法和测试系统，以研究钢铁块对磁场分布的影响。结果表明，一块钢板可使垂直于发生器的磁场增强多达40%。此外，结果表明，对场分布的影响程度是距离的函数。这项研究的结果可用于进一步开发和提高地下采矿应用中使用的电磁接近检测系统的性能和可靠性。
