摘要——我最近经历了一个提升的汽车电梯超速事故,造成严重伤害到四名乘客。虽然四名矿工躺在地板上的影响,矿工前袭击的天花板轿厢作为它的治理结构的上空相撞,估计速度的4倍的速度比正常。几个电气设计措施就可以用于
防止电梯控制系统故障。
本文检视安全的电气设计的电梯控制系统。辅助电路装置,提高了安全完整性和维护电梯控制系统进行了介绍。这些电路和设备提供保护,排除了潜在的危险,大大降低了可能发生的意外事故。
介绍
一个严重的提升电梯超速,事故发生在1994年3月28日俄亥俄州南部的一个煤矿井下矿工。[1]四进了电梯,汽车,300英尺,表面的额定转速600英尺/分钟。当电梯到达我的水平,反方向开始加速到表面而著称。实现电梯加速失去控制,这两名乘客多次推敲紧急停车按钮在徒劳的努力阻止电梯。
意识到电梯去撞在头顶上,一名乘客建议每个人躺在地板上的伤病的影响降到最低。当电梯门车相撞的治理结构到2400呎速度的估计每分钟打了四名乘客,汽车顶棚。其中一位乘客穿着非常脏兮兮的衣服,他留下一个可见的灰尘印上的电梯出他身体上的确切位置时,他勃然大怒。乘客遭受和肋骨骨折椎骨骨折除了头割伤和割伤。无花果。1和2显示正常位置的电梯,电梯的最终位置。
Abstract - A mine elevator recently experienced an ascending car overspeed accident resulting in serious injuries to four passengers. Although the four miners laid down on the floor prior to impact, the miners struck the ceiling of the elevator car as it collided into the overhead structure at an estimated speed four times faster than normal. Several electrical design precautions can be implemented to prevent elevator control system failures.
This paper examines safe electrical design of elevator control systems. Supplemental circuits and devices which improve the safety integrity and maintenance of the elevator control system are presented. These circuits and devices provide protection that eliminates the potential hazard and significantly reduces the possibility of a mine elevator accident.
INTRODUCTION
A serious ascending elevator overspeed accident occurred on March 28, 1994 at a southern Ohio underground coal mine.[1] Four miners entered the elevator car at the mine surface and descended 300 ft at the rated speed of 600 ft/min. When the elevator arrived at the mine level, it reversed direction and began to rapidly accelerate to the surface without stopping. Realizing the elevator was accelerating out of control, two of the passengers repeatedly struck the emergency stop button in a futile effort to stop the elevator.
Aware that the elevator was going to crash into the overhead, a passenger advised everyone to lay down on the floor to minimize their injuries upon impact. When the elevator car collided into the overhead structure at an estimated speed of 2,400 ft/min, the four passengers struck the car ceiling. One of the passengers was wearing very dusty clothing and he left a visible dust imprint on the ceiling of the elevator which showed the exact position of his body when he struck the ceiling. The passengers suffered fractured vertebrae and ribs in addition to head lacerations and contusions. Figs. 1 and 2 show the normal elevator position at the surface and the final position of the elevator after the accident.
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