Numerous users of indoor cranes are occasionally faced with the complex task of not only lifting and moving heavy components such as press tools, machine beds or special containers horizontally, but also turning them. This function has been possible with Demag cranes for decades, but the engineering effort involved was not to be underestimated. As part of the expansion of the universal crane range, Demag has standardized the "load turning" option to such an extent that it requires considerably less individual engineering work for universal cranes with two hoist units, without compromising the acknowledged high level of safety. The customer should therefore benefit from a high level of safety and functionality at an economically attractive price.

Reinforced steel structure, more sensors
The package of measures that enables the "load turning" function includes a higher dimensioning of the steel structure and equipping it with additional sensors. In addition, the Demag SafeControl control system, which controls and monitors all crane movements and functions in a safety-oriented manner, is modified for the load turning process. Depending on the requirements for the size of the rope hoists, a skew angle of up to 20 degrees can be achieved. Loads weighing up to 50 tons can be turned with universal cranes modified in this way.
Users can choose between two safe versions. Precise measurement of the rope angle is achieved by combining the Demag SafeControl control system with a two-channel, non-contact sensor system. In the basic version, an acoustic and visual warning is given as soon as the maximum deflection angle is reached.

In the safest configuration level, the Demag SafeControl system monitors all movement sequences in a safety-oriented manner and automatically stops lifting and travel movements if the maximum permissible rope angle is exceeded. A high safety category is achieved: performance level d (lifting) or c (travel) in accordance with EN 13849-1, category 3. In both versions, the load turning function is operated wirelessly as standard via joystick transmitters, which enable intuitive control with a view of the load to be turned. Alternatively, it can also be controlled via push-button hand-held transmitters or hand-held transmitters with a mini-joystick operating concept.

The article appeared in materialfluss 11-12/20.