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我厂411-72号桥式吊车,原是50年代产品,桥架上有火线14条(其中二条是安装电磁铁用的),火线滚轮14个,其轮、轴材质均为铸青铜。(滚轮结构如图1所示)。过去,导电时,轮有轴向窜量和径向跳动,不易密封,轮轴之间未采用过润滑剂润滑,只是在装配时加大配合公差(一般间隙都在0.30～0.50毫米。滚轮在运行约1000小时后,内孔就被磨成椭圆形,间隙甚至达到10毫米以上,容易造成断续供电现象,即产生电火花击伤滚轮孔表面,既影响天吊正常运行,还须频频换滚轮,浪费材料。现在,我们在轮轴之间采用石墨粉末作润滑剂,其方法是;将滚轮加工成图2所示,轮轴结构不变,配合公差选择D_3/dc_3
My factory No. 411-72 bridge crane, was originally a 50’s product, the bridge has 14 FireWire (of which two are used to install the electromagnet), FireWire wheel 14, the wheel and shaft material are cast bronze. (Wheel structure shown in Figure 1). In the past, when conducting, the wheel had axial run-up and radial runout, which was not easy to seal. Lubricant was not used between the axles, but the fitting tolerance was increased at assembly (generally, the clearance was between 0.30 and 0.50 mm. About 1000 hours later, the hole was ground into an oval, the gap even more than 10 mm, likely to cause intermittent power supply phenomenon, that is, electric spark injury wheel hole surface, both affect the normal operation of the crane, but also frequently change the wheel , Waste materials.Now, we use graphite powder as a lubricant between the axle, the method is; the wheel into the process shown in Figure 2, the same axle structure, with the choice of tolerance D_3 / dc_3