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我厂是铁道部直属大型企业 ,担负着铁路客车制造的繁重任务。生产中我厂有各种规格、吨位的起重机近 10 0台 ,其中铸钢分厂的一台 10ｔ× 2 2 5ｍ双梁抓斗桥式起重机与一台 2 0 / 5ｔ× 2 2 5ｍ双梁桥式起重机均已使用 2 0多年。修复前这两台起重机存在大车运行不稳 ,大车
Our factory is directly under the Ministry of Railways large enterprises, responsible for the heavy task of making railway passenger cars. There are nearly 100 cranes of various specifications and tonnage in production. Among them, a 10t × 225m double girder grab crane at a steel plant and a 20 / 5t × 225m double girder Overhead cranes have been used for more than 20 years. Before the repair of these two cranes there is a cart run unstable, cart