Double Girder Hoist

A double girder hoist is a lifting and travel unit fitted to double girder overhead and gantry cranes. Unlike a single girder hoist that hangs below the beam, it is built as a crab that sits on rails on top of the two girders and travels on steel wheels. The load is shared between the two girders, so it suits heavy loads and intensive multi-shift duty. Because the drum and motor sit above the girders, the hook rises up into the space between them, giving more lifting height than a single girder hoist in the same hall. Walkways and handrails can be fitted on the bridge beside the hoist, giving technicians direct access to the motor, drum, brakes and electrical systems without an external access platform. On hoists with a double-grooved drum, the hook rises and lowers in a vertical line, without drifting sideways as the rope winds on. Most models include inverter speed control and overload protection. The crab gauge, the distance between the centres of the rails it runs on, is set to suit the bridge, so a new hoist can also be fitted to an existing crane as part of an upgrade or replacement of an old hoist. The model table lists the lifting capacity, lifting height, speeds, duty classification and crab gauge for each model.

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Curved Track Monorail Hoist

A curved track monorail hoist is a wire rope hoist mounted on an articulated trolley, travelling along a monorail track that includes curves and bends. A standard rigid trolley jams in a curve under heavy load, so the articulated trolley is built from two or more travel units joined by pivots, letting each unit follow the line of the beam separately. It suits plants where the load needs to move between halls, around machines or along a production line that is not straight. Lateral guide rollers keep the trolley centred on the beam through the curve and stop the steel frame rubbing on the flange. The trolley spreads the load over a larger number of wheels to reduce pressure on the flange in the curved section. On rolled beams the flange width changes slightly in the curve, and the wheels are adjusted to compensate. The minimum curve radius increases with the hoist's lifting capacity, so the track and hoist should be designed together. The power supply also has to suit the track: flexible conductor lines that follow the curve, or a festoon cable system on a curved C-track running parallel to the beam. The model table lists the lifting capacity, minimum curve radius, lifting height, speeds and flange width range for each model.

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Single Girder Hoist

A single girder hoist hangs from the lower flange of a single steel beam and travels along it. It serves as the lifting unit in single girder overhead cranes, single girder gantry cranes and monorail systems. Unlike a double girder hoist, which runs on top of two girders, its whole structure hangs beneath one beam. The hoist is available in several configurations to suit the structure and track: Standard headroom: the hoist body, including drum and motor, hangs below the travel trolley. Simple construction and easy to maintain, but with a larger distance between beam and hook. Low headroom: the hoist body sits alongside the beam, balanced by a counterweight on the other side. The hook rises almost to the level of the beam, giving more lifting height in buildings with low ceilings. Curved track trolley: a travel trolley with swivelling joints that lets the hoist run on monorail tracks with curves. On hoists with a double-grooved drum, the hook rises and lowers in a vertical line, without drifting sideways as the rope winds onto the drum. This matters where the load must be placed at an exact point. The trolley width is set to the beam flange, and end stops on the beam limit its travel. The model table lists the lifting capacity, lifting height, headroom, speeds and flange width range for each model.

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