What is the difference between lifts and cranes, load-bearing form of fixed electric hoist ah

Load-bearing form of fixed electric hoist my understanding is that the electric hoist is fixed to rely on its own gravity or the gravity of the suspended object, can not only consider the electric hoist alone, to be matched with the electric hoist beams, bridges as a whole, this whole and other structures can be relatively active, such as monorail crane is strictly speaking also a kind of electric hoist, monorail crane bridge and hoist as a whole, the whole of the fixed Is to rely on its own gravity and the weight of the hoist. If it is the kind of electric hoist installed on the fixed I-beam, due to the I-beam is fixed on the steel structure, electric hoist hanging on the I-beam, electric hoist and I-beam can not be as a whole, the electric hoist itself by the I-beam support force fixed, so it does not belong to the load-bearing electric hoist. In general, as long as the electric hoist can be up and down, left and right, forward and backward movement, belongs to the load-bearing electric hoist, belongs to the scope of special equipment.