由南昌柴油机厂傅敏华等人发明的“预应力张拉器”修复桥式起重机主梁下挠的新技术,较好的解决了桥式起重机维修中的疑难问题,于1988年3月由中国专利局授于国家专利权。桥式起重机主梁下挠的现象,在一些使用单位普遍存在。其危害性表现在:大车啃轨、小车爬坡和溜车、起重吨位下降,甚至发生事故,直接影响生产、威胁安全。在桥吊主梁上安装“预应力张拉器”,可 By Nanchang Diesel Engine Factory Fu Minhua, who invented the “prestressed tensioner” to repair the overhead crane overhead girder deflection of the new technology, a better solution to the difficult problems in the maintenance of overhead cranes, in March 1988 by the Chinese patent Board granted in the national patent. Bridge girder under the main deflection of the phenomenon, in some units commonly used. Its harmfulness manifests itself in the following aspects: the cart gnawing on the rails, the car climbing and rolling the car, the drop of the crane tonnage, or even an accident directly affects the production and threatens the safety. Install the “prestressing tensioner” on the girder of the bridge crane