当起重机正常工作时，允许的起升时间称为额定起重量。吊钩起重机的额定起重量不包括吊钩和动滑轮的自重。抓斗、电磁吸盘和其他取物装置应包含在额定起重量中。常用系列有5t、10t、16t、20t、32t和50t。

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