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KJ型提升机使用年限已较长,少数主轴出现了裂纹,大都在联轴器键槽根部,呈现网状和线状,如图1所示。
KJ-type lifter has a longer service life, a few spindles have cracks, mostly in the root of the coupling keyway, showing reticular and linear, as shown in Figure 1.