Trunnion Pins

Trunnion pins are critical load-bearing components in refractory-lined ladle systems, designed as precisely machined cylindrical shafts that interface with ladle trunnion rings. They transfer the entire weight of the molten metal-filled ladle to the crane hook or turret mechanism while allowing controlled tilting for pouring operations. These pins must withstand extreme thermal cycling, mechanical shock loads up to several hundred tons, and corrosive environments from slag and metal splashes.

Trunnion pins function as rotational axles and primary load carriers. They are inserted through trunnion rings welded to the ladle shell, with their ends engaging bearing surfaces in the lifting mechanism. During operation, the pins bear compressive, shear, and bending stresses while enabling smooth rotation through integrated bearing surfaces or separate bearing assemblies. Their cylindrical geometry distributes stress evenly, while precise tolerances ensure minimal play and vibration during ladle movement.