QT40B塔机是一种用途广泛的高层建筑施工设备，主要用于26层以下住宅建筑和滑模施工的吊装，也可用于港口、货场的装卸。我单位自1994年在房屋建筑施工中使用QT40B塔机以来，发现变幅电机联轴器出现故障频繁，导致设备故障停机次数增多，影响施工进度，后经对其进行技术改造，? QT40B tower crane is a kind of high-rise building construction equipment with a wide range of uses. It is mainly used for hoisting of residential buildings and sliding mode construction under 26 stories and can also be used for loading and unloading at ports and freight yards. My unit since 1994, QT40B tower crane used in housing construction and found that variable frequency motor couplings have frequent failures, resulting in increased equipment downtime, affecting the construction progress, and after its technical transformation?