Design criteria of ladle crane

By admin August 11, 2014 12:01 pm IST

 Ladle cranes have utmost importance with respect to production efficiency of steel melting shop.  Hence, the selection of ladle cranes is vital.  However, enough wisdom is not meted out in its selection with respect to its specification, choosing of materials and components.
Any steel plant will be requiring ladle cranes whether it is of 3MT or 5MT.  Capacity of the ladle crane may also vary depending on the ultimate size of the SMS (steel melting shop).
When the procurement of these cranes is initiated by smaller size steel plant, the price becomes the essence which to my mind is not correct.  The price hurdles are to be ignored to a lesser extent if not to a greater extent not to sacrifice the operational efficiency of the steel plant i.e. SMS as well longevity of the crane.  By saving money during the time of initial procurement stage will not be a wise decision because it’ll pilferage more and more money in the long run because of troublesome operation of the crane.
Design standard to be followedThere are various concepts of selection of this crane are prevailing. In Indian market, IS-4137 is employed and in international market, people recommend FEM and CMAA standard.  There are distinct advantages with respect to FEM standard because; it reduces the size of wheel, optimising the size of hook.  But, the  feels that from all the standards available for this particular crane, FEM is the best one for some of the following reasons:
• Wheel load calculation is not based on mean load and ultimately the manufacturer is able to derive the optimisation of wheel. • This design standard provides accurate compatibility of wheel and rail size.• Classification of mechanism is distinctly spelt out and so the design has a wide choice to select.• Provides very detailed guidelines to check fatigue.• Rope and rope drum selection is very accurate.
Following are the parts which are very critical while selecting a ladle crane for 3 MT to 5 MT SMS.

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