峨眉冶金机械厂铸造车间有两台90m~3铸型烘干炉,台车轨道结构原为传统的铁球自滚运行式,使用时存在许多问题:①铁球与轨道为点接触,受力面积小,轨道磨损大,平均两年半换一次轨道。②铁球自由放置在轨道上,不但易丢失,而且常拥塞于一处,运行中台车受力不均,振动大,车架很易损坏,一副车架仅使用3年左右。车上工件放不平稳,容易出事故。③炉内砂尘一般较多,有的铁球遇轨内 There are two 90m ~ 3 mold drying furnaces in the foundry workshop of Emei Metallurgical Machinery Factory. The trolley track structure was originally the traditional iron ball self-rolling running type. There are many problems when it is used: ① The iron ball is in point contact with the track, Small area, track wear and tear, an average of two and a half orbit. ② iron ball placed on the track free, not only easy to lose, and often congested in one, the operation trolley uneven force, vibration, frame is very easy to damage, a frame only use about 3 years. Workpieces put on the car is not stable, easy to accident. ③ furnace sand and dust are generally more, some iron ball meets the rail