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历来分级机主轴结构一体化，是通过焊接方法将上轴头与主轴体联接在一起的（如图1）。焊接前必须将主轴体端部镗出内孔，以保证焊接时轴头与主轴体的同心度，但由于主轴体较长（为6200mm）所以加工较困难。这种结构开始使用时还可以，但大约运行一年以后轴颈就磨损，必须修复或
Historically, the integration of the spindle structure of the classifier is achieved by welding the upper shaft and the spindle body together (Figure 1). Before welding, the end of the spindle body must be bored out of the inner hole to ensure the concentricity between the shaft head and the spindle body when welding, but the machining is difficult because the spindle body is longer (6200 mm). This structure can be used when it starts to use, but the journal wear after about one year of operation and must be repaired or