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1·The overhead travelling crane is a hoisting equipment most widely used in industrial enterprises.

桥式起重机是工矿企业使用最为广泛的超重设备。

2·In recent years some new profile steels are used for main girder of domestic made electric single girder overhead travelling crane.

近年来国内电动单梁起重机主梁采用一些新截面型式。

3·Aiming at the shortage of conventional overhead travelling crane control system, the application of a novel control and protective switch in innovation for overhead travelling crane was introduced.

针对传统天车控制系统的不足，介绍了一种新型控制与保护开关在天车改造中的应用。

4·It is proved by practice that the new process is a effective heat treatment method for producing the travelling wheel of heavy overhead crane.

实践证明新工艺是一种生产重载天车走轮行之有效的热处理方法。