or spin-lifting substructure, mast and substructure are raised integrally. the rig is controlled concentrative in driller's control cabin and achieves automatic bit feeding function. the auxiliary brake of ac-vfd drilling rig is dynamic brake. . electric-drive drilling rig the drive mode of dc electric-drive...
load iso low headroom double girder overhead travelling crane for construction steel plant double beam overhead crane controled by crane cabin for steelworks workstation double girder overhead cranes / ton for hydropower industry electric traveling single girder overhead cranes capacity . m span m lifting...
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