Safe Zone “One Question per Day” 2010-11-24

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The rated lifting capacity of a crane refers to the maximum mass that can be safely lifted (　). 　　 A. The sum of the grab and the load being lifted 　　 B. The sum of the electromagnetic chuck and the load being lifted 　　 C. The net mass of the load being lifted when a hook is used 　　 D. The sum of the tank and the load being lifted 　　 E. The sum of the ladle and the molten steel Please hide your reply; any reply that remains visible will be deleted. Hiding method: http://bbs.hcbbs.com/thread-492556-1-1.html Do not edit your reply after posting it. The rated lifting capacity of ABCDE refers to the total weight of the material that can be lifted by the crane, including the weight of the lifting accessories (or attachments), while the effective lifting capacity refers to the net weight of the material that can be lifted by the crane. 　　 Devices such as grabs, electromagnetic cups, balance beams, and ladles all belong to detachable lifting attachments; they possess a large mass of their own, and the rated lifting capacity includes the sum of the load weight and the mass of these detachable lifting attachments. When using a hook, the rated lifting capacity refers to the net mass of the material being lifted. When two cranes have the same lifting capacity but different types of lifting attachments, the mass of material that can be safely lifted also varies. Especially when using detachable hooks or other lifting accessories, the mass of those accessories must be subtracted from the rated lifting capacity in order to determine the mass of material that can be safely lifted.