A boom extension device for a dockside container crane. A boom comprises a rear boom section (11) and a front boom section (12). The extension device comprises: an extension trolley tool (2) which is disposed below the rear boom section (11) and the front boom section (12) during an extension operation, and which comprises a wheel set (21), a trolley frame (22), a construction platform (23), and a movement track (24) disposed on the construction platform; a fits support frame trolley (31) disposed on the movement track (24) and used to carry a boom extension section (41) and guide the boom extension section (41) to move in a first direction; and a second support frame trolley (32) disposed on the movement track (24) and used to carry the front boom section (12) and guide the front boom section (12) to move in a second direction perpendicular to the first direction in a first plane. Further included is an extension method for a boom of a dockside container crane. The invention reduces usage of heavy-duty equipment.

A method of positioning a movable structure of an overhead crane, the movable structure being either a trolley or a bridge of the overhead crane, the method comprising providing a position reference for the movable structure, controlling with a state-feedback controller the position of the movable structure, the position of the movable structure and a sway angle of the load being state variables of the system used in the state-feedback controller. Further the method comprises determining the position or speed of the movable structure and the sway angle of the load or angular velocity of the load, providing the determined position or speed of the movable structure, the determined sway angle of the load or angular velocity of the load and the output of the state-feedback controller to an observer, producing with the observer at least two estimated state variables, forming a feedback vector from the estimated state variables or from the estimated state variables together with determined state variables, using the formed feedback vector as a feedback for the state-feedback controller, and providing the output of the controller to a frequency converter.

A service vehicle moves on a rail system including a first set of parallel rails arranged in a horizontal plane and extending in a first direction and a second set of parallel rails arranged in the horizontal plane and extending in a second direction which is orthogonal to the first direction. The first and second sets of rails form a grid pattern in the horizontal plane including a plurality of adjacent grid cells. The service vehicle includes a container handling vehicle part for storing a container handling vehicle operating on the rail system, and wheels for allowing movement of the service vehicle along the rail system during operation. The service vehicle further includes a displacement mechanism, and a hoist arrangement connected to the displacement mechanism. The displacement mechanism and the hoist arrangement are configured for moving the container handling vehicle between an operational position on the rail system and a loaded position within the container handling vehicle part.

A method and system for conducting a non-contact survey of an overhead crane runway system using a survey apparatus that is alternately located in the crane bay or on a crane bridge girder. Disclosed more particularly are a method and system for testing an overhead crane runway beam 3D alignment or an overhead crane runway rail 3D alignment using a 3D laser scanner.

A cable winch arrangement (1) which includes at least one cable drum (2), which is mounted rotatably about a drum axis (3), for winding up and/or unwinding at least one cable (30-37), and a supporting structure (20), and a spindle drive (14) for displacing the cable drum (2) relative to the supporting structure (20), wherein the spindle drive (14) has a spindle (16) extending along a spindle axis (15), and a cable run-off point (6) of the at least one cable (30-37), at which the cable (30-37) runs tangentially onto and/or out from the cable drum (2), is at least substantially positionally fixed with respect to the supporting structure (20), and the spindle axis (15) is arranged coaxially with respect to the drum axis (3) of the cable drum (2).

A lifting apparatus for raising and lowering objects has two frame assemblies positioned one above the other, so as to be mutually parallel, with respect to a vertical direction, the lower frame assembly suspended on the upper frame assembly using lifting traction means, such that the lower frame assembly can be drawn up towards the upper frame assembly by winding the lifting traction means, and the lower frame assembly can be lowered relative to the upper frame assembly by unwinding the lifting traction means. The lifting apparatus has oblique traction means extending between the frame assemblies that can be wound and unwound using a tensioning device, two of which mutually intersect such that the lower frame assembly is stabilized, relative to the upper frame assembly, in at least one deflection direction transverse to the vertical direction.

The hoist track adapter is configured for use with a hoist. The hoist track adapter is configured for use with an I-beam. The hoist track adapter attaches the hoist to the I-beam. The hoist track adapter enables the hoist to move along the track formed by the I-beam while the hoist is under load. The hoist track adapter comprises a cross beam, a plurality of beam trolleys, a plurality of brackets, and a plurality of bolts and nuts. The plurality of bolts and nuts: 1) attach the plurality of beam trolleys to the cross beam; and, 2) attach the plurality of brackets to the cross beam. The plurality of beam trolleys attaches the cross beam to the I-beam. The plurality of brackets attaches the cross beam to the hoist.

A rope hoist which hoists and lowers a cargo via a wire rope includes: a frame structure which rotatably supports a wheel; a rope drum mechanism which is provided on one side of the frame structure in a width direction, and includes a drum motor which rotates the rope drum; a counterweight which is provided on another side of the frame structure in the width direction and is arranged in a state of having a space with respect to the frame structure; and a control unit which is attached to a side of the counterweight opposite to the rope drum mechanism in the width direction and inverter-controls the drum motor, to the rope drum mechanism side of the counterweight, a braking resistor part which processes regenerative electric power in the inverter control is attached in a state of being located in the space.

A method of positioning a movable structure of an overhead crane, the movable structure being either a trolley or a bridge of the overhead crane, the method comprising providing a position reference for the movable structure, controlling with a state-feedback controller the position of the movable structure, the position of the movable structure and a sway angle of the load being state variables of the system used in the state-feedback controller. Further the method comprises determining the position or speed of the movable structure and the sway angle of the load or angular velocity of the load, providing the determined position or speed of the movable structure, the determined sway angle of the load or angular velocity of the load and the output of the state-feedback controller to an observer, producing with the observer at least two estimated state variables, forming a feedback vector from the estimated state variables or from the estimated state variables together with determined state variables, using the formed feedback vector as a feedback for the state-feedback controller, and providing the output of the controller to a frequency converter.

A crane, such as a bridge crane or gantry crane, having at least one horizontally extending crane girder, which is designed as a lattice girder having a plurality of braces and on which a crane trolley having a lifting device can be moved. At least some of the braces are planiform, and each of the planiform braces has a flat main surface, which extends transversely to a longitudinal direction of the crane girder. On each longitudinal side of the braces, a first cut-out and a second cut-out are provided in the main surfaces. The longitudinal sides of at least some of the planiform braces are free of edge bends at least between the first and second cutouts.