self-propelled lift crane with a capacity increase comes lifting device

摘要

Mobile lift crane includes a central crane unit, and the boom unit and the counterweight unit. Central crane unit is perforated body, movable ground engaging member, and the turning member is attached to the moveable ground engaging members by a rotatable connection portion so as to be pivotable relative to the moveable ground engaging members, the doing. Boom unit, the support member has at least one moveable ground engaging members, and the boom, pivotally attached to the support member. Counterweight unit has a counterweight provided on the support member. Rigging is, as the equilibrium of lifting was suspended load by the boom can be held by the counterweight, and connects the boom and the counterweight unit. Boom unit and the counterweight unit is connected to the central crane unit by the structural member. The structural member, withstand compressive load, the boom unit, the swing body, and, although maintaining the counterweight unit in a state of being aligned laterally with one another, the boom unit, the swing body, and, relative between counterweight unit vertical movement is possible. A central crane unit, and the boom unit, and, on the coupled body of the structural member between the central crane unit and the boom unit, the main mast is pivotally mounted. In other embodiments, the counterweight unit having a pivot axis, and the boom unit is directly connected by a structural member. Moveable ground engaging members of the boom unit is rotatable relative to the boom unit support member, the boom unit, i) to move the swivel axis of the counterweight unit in a circular arc direction around, and, ii) a structural member It can move in the direction collinear.