目前,我国林区贮木场已使用龙门起重机六十余台,装卸桥一百多台。实践证明,已投入生产的大多数门式起重机的设计、制造、安装质量方面都存在一些问题。使用中普遍存在着一个问题是:起重机大车运行时啃遭(即车轮轮缘与轨道侧面接触,产生严重的挤压磨损),使用条件较好的部门(铁路、码头)啃道现象较少。轻微啃道不影响使用,常被忽视;严重时,使车轮与轨道剧烈磨损,起重机的附加载荷增大,甚至使起重机不能行走,出现脱 At present, China’s forestry storage yard has used more than 60 gantry cranes, loading and unloading more than 100 Taiwan. Practice has proved that most of the gantry cranes that have been put into production have some problems in the design, manufacture and installation quality. One of the common problems in use is that when the crane runs on the bus (that is, the wheel flange touches the side of the rail, resulting in severe crushing and wear), the use of good conditions (railways and docks) . Slightly chewed the road does not affect the use, often overlooked; serious, severe wear and tear on the wheels and rails, crane additional load increases, and even make the crane can not walk, appear off