Guiding unit for slabs in a continuous casting plant

A guiding unit for slabs comprising at least two rolls connected to each other along a common axis of rotation X,

• wherein each roll comprises a first tubular element and a second tubular element external and coaxial to the common axis X and to the first tubular element and removable from said first tubular element,
• wherein each roll comprises a respective hub at its two ends,
• wherein cooling channels are provided in each roll between said first tubular element and said second tubular element for a passage of a coolant liquid,
• wherein said cooling channels are defined by grooves made on an outer surface of the first tubular element and closed by an inner central surface of the second tubular element,
• wherein each hub is provided with cavities communicating with the cooling channels of the respective roll so as to define a path for the coolant liquid from a first end to a second end of the guiding unit, the path crossing said at least two rolls,
• wherein a first hub of each roll comprises a first inner chamber for letting coolant liquid into the respective roll, from which diverge first inner ducts communicating with a first outer annular channel coaxial to the common axis X and from which branch off second inner ducts communicating with first ends of the cooling channels of the respective roll, and
• wherein a second hub of each roll comprises a second inner chamber for letting coolant liquid out from the respective roll,
• wherein third inner ducts converge in said second inner chamber, said third inner ducts communicating with a second outer annular channel coaxial to the common axis X, and
• wherein fourth inner ducts arrive in said outer annular channel, said fourth inner ducts communicating with second ends of the cooling channels of said respective roll.