Automatic operation in all weathers |
Bulk handling crane in continuous operation
Bulk material handling around the clock – outdoors and in all weathers. These are the operating requirements that have to be met by a Demag overhead travelling crane at a Swedish paper factory. The crane operates in automatic mode to blend the incoming materials and to serve the furnaces according to schedule. In the Swedish town of Sundsvall, SCA Paper operates a plant with four machines to produce paper for printing newspapers and magazines. To generate the steam needed in production, two furnaces are fi lled with fuels that are conveyed to the chute by a newly installed automatic crane.
The double-girder overhead travelling crane has a load capacity of 12 tonnes and travels on a runway at a height of approximately 30 metres. It clears shredded wood chips from two tipping positions and fi rst heaps them in the storage area. Using a motor-powered multi-jaw grab, which has a capacity of up to eight cubic metres thanks to its enclosed design, the crane also picks up deliveries of slurry and distributes it extensively over the storage area. The heating value is homogenised by blending these two materials. The crane works around the clock, also operating smoothly down to temperatures of 30 degrees below zero. For this reason, the entire crab is provided with a heated, insulated and sound-proofed enclosure, which protects all components from the weather. The electrical components of the crane installation are installed in an insulated and heated container on the crane bridge. Eight motors for the longtravel motions and four for cross-travel ensure that the crane positions exactly, even in strong wind conditions. Only at wind force 10 is the crane switched off and then mechanically locked.
Noise reduction measures also had to be taken because of a residential area on the opposite shore. A complete package of measures enabled the noise level to be reduced signifi cantly below the specifi ed level of 80 decibels. Besides the sound-proofed enclosure of the crab, this also included speed reduction on the open winch unit and the low-noise grab.
About the company
Demag Cranes & Components GmbH based in Wetter/ Ruhr is a subsidiary of Demag Cranes AG and a supplier of industrial cranes and crane components for material flow, logistics and industrial drive applications. Services, such as spare parts, maintenance and refurbishment services, are another key element of the Company’s business activities. Demag Cranes & Components is represented all over the world by approximately 5,000 employees in 22 foreign subsidiaries and agencies in 46 countries,. With more than 650,000 Demag brand cranes and hoists for industrial applications in operation, the company has the largest installed base worldwide.
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Contact:
Corporate Communications
Demag Cranes & Components
Mr Christoph Kreutzenbeck
Tel. +49 (0) 211 / 7102-3907
