Roller assembly, casting apparatus, and roller separating method for same

A casting apparatus for casting a slab using a mold, the casting apparatus comprising:

• a plurality of segments consecutively arranged under a mold so as to guide a movement of a slab drawn from the mold,
• wherein the segments each comprises:
• a plurality of rollers consecutively arranged along a movement path of the slab and spaced apart from each other so as to face each other with the movement path therebetween;
• and
• a roller assembly attached to each of the rollers, and
• wherein the roller assembly comprises:
• a body;
• a first shaft movably installed inside the body;
• a supporter fixed to one end portion of the first shaft and configured to rotatably support the each of the rollers;
• a plunger coupled to the other end portion of the first shaft and configured to be hydraulically operated to retreat the first shaft from the movement path of the slab and advance the first shaft towards the movement path of the slab;
• a second shaft movably inserted into an insertion hole formed at the other end portion of the first shaft, one end portion of the second shaft being fixed to the body;
• and
• an elastic member installed inside the insertion hole, wherein the elastic member elastically couples the first shaft and the second shaft to each other and guides retreating and advancing movement of the first shaft.