A double girder process crane from Demag Cranes & Components has been commissioned at Swedish iron foundry Arvika Gjuteri AB for the fast and reliable collection of scrap material and its transfer to the induction smelting furnace.
Featuring an integrated weighing and position measuring system, the Demag process crane was installed as part of the foundry’s strategy to considerably increase handling rates for scrap in line with its increased production capacities.
Anders Nilsson, Project Manager at Arvika explains that speed and precision are decisive factors during material collection in order to meet the growing requirements of customers. The new Demag crane takes only 12 minutes for a single operating cycle as against the 60 minutes required by the old crane.
The Demag ZKKW double girder process crane is responsible for much faster and more reliable collection of scrap material, also known as charge make-up, and moving it to the smelting furnace. Where Arvika employees had to work 24 hours a day in the scrap yard and melting shop earlier, the new crane can handle the same weight of scrap in less than two shifts.
A key advantage of the charging crane is that its capacity can be increased in future to meet growing needs.
Lutz Dowy, Senior Vice President Process Cranes at Demag Cranes comments that their in-depth know-how of the foundry industry and the related development of customer-specific charging cranes was a great advantage for Arvika.
Charging crane: integrated weighing and evaluation system saves time and costs
At Arvika Gjuteri AB, the scrap is prepared and correctly sorted in nine boxes. Orders for material pick-up are transmitted to the crane staff in the control station including information about the quantities to be removed from each box.
Working five days a week in two-shift operations, the crane first takes the material with the largest quantity from a box and, at the same time, determines the weight via calibrated crane scales integrated in the open winch crab. On the basis of this data, the quantities for further material are determined, transmitted to the cab by radio and displayed there.
As soon as the desired final formulation is complete, the mixture is then tipped onto a heap of scrap from where it is conveyed to the smelting furnace. The more precisely the respective mixture is produced by the crane, the fewer high-cost alloys are required.
Key features of Demag ZKKW double girder cranes:
- Span dimension of 22.65 metres, travelling on a 40m long crane runway
- Equipped with a multi-purpose MPW open winch, characterised by compact and maintenance-friendly design
- Round magnet connected to the hoist by a 4/2 reeving arrangement picks up the load
- Up to 80 m/min in long travel, cross travel up to 60 m/min and load-dependent hoist speeds up to 66 m/min
- Infinitely variable motions in three axes are regulated via frequency inverters to enhance safety
- Crab and crane are equipped with cameras for detailed monitoring from the control station
- Control station designed as a cab with a control panel and ergonomically arranged operating elements