The invention provides an early warning system for preventing falling into a lift shaft. The system comprises a landing door lock relay, a normally-closed contact switch corresponding to the landing door lock relay, a car door lock relay, a normally-opened contact switch corresponding to the car door lock relay, a delay relay, an early warning device and a preset power source, the normally-closedcontact switch, the normally-opened contact switch and the delay relay are connected in series, the delay relay, the early warning device and the preset power source are connected in series, under thecondition that an elevator normally runs, the normally-closed contact switch and the normally-opened contact switch are reciprocal signals, the delay relay is not attracted, when an elevator car is not in the door opening area, and a person forcefully opens or damages a landing door, due to the fact that a car door is in the closing state, the car door lock relay is closed, the normally-opened contact switch is turned off, when the landing door is opened, the landing door lock relay is released, the normally-closed contact switch is turned off, the delay relay is powered on and carries out attraction, the early warning device in the lift shaft is started, and the safety early warning effect is achieved.
本发明提供的预防坠入电梯井道的预警系统包括层门门锁继电器、层门门锁继电器对应的常闭触点开关、轿门门锁继电器、轿门门锁继电器对应的常开触点开关、延时继电器、预警装置和预设电源;常闭触点开关、常开触点开关和延时继电器串联;延时继电器、预警装置和预设电源串联。在电梯正常运行情况下,常闭触点开关和常开触点开关总是为互逆信号,延时继电器不会吸合;当电梯轿厢不在开门区域,而人员强制开启或者破坏层门时,因轿门为关闭状态,轿门门锁继电器闭合,则所述常开触点开关亦为闭合,而层门被开启时层门门锁继电器释放,则所述常闭触点开关闭合,因此延时继电器将得电而吸合,此时电梯井道内的预警装置被开启,从而启到安全预警作用。
Early warning system and method for preventing falling into lift shaft
一种预防坠入电梯井道的预警系统及方法
2020-07-28
Patent
Electronic Resource
Chinese
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