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地下开采由于可能发生冒顶、瓦斯爆炸、火灾和其他事故,所以必须考虑紧急情况下人员能安全、迅速撤离的措施。为此,雷克斯诺尔德机械制造分公司生产了诺德贝丽800型安全提升机。提升机用独立能源,供井深800呎(243.8米)的竖井作紧急提升之用,美国约有85%的竖井普遍装备了这种提升机。提升机一次可提升5人,最大提升速度为每分钟230呎(70.1米),一个循环的时间(从井口到井底而后再返回井口)为5分钟。这种紧急提升装置可以安装成永久性的或半永久性的,布置在风井中。提升机
Underground mining As roofing, gas explosions, fires and other accidents may occur, it is important to consider measures that a person can safely and quickly evacuate in an emergency. To this end, Rex Nord Machinery Manufacturing branch produced Noble Belle 800 safety hoist. Elevators are powered by independent energy sources for emergency hoisting of a shaft of 800 feet (243.8 meters) in depth. Approximately 85% of the shafts in the United States are commonly equipped with such hoists. The lift will lift five people at a time. The maximum lift speed will be 230 feet per minute (70.1 meters) and five minutes for one cycle, from the wellhead to the bottom of the well and back to the wellhead. This emergency lift can be installed permanently or semi-permanently in the well. Hoist