For reasons of limited vertical installation space, the entire control system was not accommodated in an external switch room but in the gantry itself.
Furthermore, all components used must be designed for heavy duty operation. The crane is constantly exposed to large amounts of dust and high temperatures. The slabs and the hot holding furnace emit so much heat that temperatures up to 70°C are reached even just below the ceiling of the hall.
Accordingly, the movable cables for electrical energy and signals as well as the energy chains must be designed to cope with the adverse conditions in order to ensure trouble-free operation under the extreme conditions.
Based on the special requirements for energy chain and cables, the chains were designed and supplied as pre-assembled readychain basic systems.
The cables have been inserted but have not been completely pre-assembled or fitted with connectors. Plug-in connectors are unnecessary because the cables are connected to terminals. In addition, the cable lengths for such a special project cannot be determined down to the centimetre. Flexibility is more important in the assembly. Only the fibre optic cables (FOC) were harnessed with connectors in advance.
Given the requirements, the igus technicians recommended a roller energy chain.
Therefore a rol e-chain 5050RHD was used on the crane gantry. HD stands for heavy duty.
This type of chain differs from the 5050R due to its reinforced side sections, additional wear surfaces and an approximately 40 per cent stronger pin-and-bore system. As a result, cable weights – in this case 13 kg/m – can be guided and moved reliably. The energy and signal supply to the cabin is ensured by a rol e-chain of type 4040RHD.
In addition, all movable chainflex cables are equipped with a TPE jacket that can withstand higher temperatures.
The two filled energy chains were each delivered on a transport drum so that they could be mounted on the crane bridge within a short time. Altogether, only three days were estimated for mechanical and electrical installation of the 180-tonne slab transport crane: In a rolling mill, shutdowns can cost a great deal of money.