老式桥式双梁起重机的小车供电方式一般采用滑触线,滑触线用角钢作固定导电件、铸铁滑块为滑行接触导电件随小车运动,存在如下缺点: 1.运行不可靠,角钢外露,易积灰氧化,接触不良时造成断相事故。 Old bridge double girder crane trolley power supply generally use the trolley line, trolley line with angle for fixed conductive parts, cast iron slider for sliding contact with the conductive parts with the car movement, there are the following disadvantages: 1. Unreliable operation, the angle exposed , Easy to accumulate ash oxidation, poor contact caused when the phase failure.