抱闸是当电梯轿厢处于静止且马达处于失电状态下防止电梯再移动的机电装置。在某些控制形式中，它会在马达断电时刹住电梯。
在使用抱闸扳手时，必须有一人控制抱闸扳手，而另一人转动盘车手轮。
To operate the equipment, it is essential for one person to control the releasing of the brake, whilst another operates the winding crank.
分析大倾角电牵引采煤机液压制动器频繁抱闸的原因，提出的解决方案实用效果良好。
This paper analyses the reasons of frequent abnormal braking on shearer and gives ideas for solving problem which has well effect in practice.
利用电磁电路设计的抱闸装置，解决了回转臂系统刹车后，滑动小于某一小角度这一技术难题。
The technical problem-that the gliding rotary arm after braking is smaller than a small angle-is solved through internal contracting brake device designed by using electromagnetic circuit.
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