Device for gripping a hollow body having an enhanced capacity for evacuating heat

Device (12) for gripping a hollow body (2), which comprises:

• A freely-rotating shaft (13);
• A mandrel (30) that is integral with the shaft (13), with this mandrel (30) comprising:
• An end fitting (31),
• A radiator (51),
• A crosspiece (57) inserted between the end fitting (31) and the radiator (51),
• An expandable ring (62) mounted between the end fitting (31) and the crosspiece (57),
• An elastic element (66) mounted between the end fitting (31) and the expandable ring (62),
• wherein:
• The radiator (51) is mounted directly on the end fitting (31),
• The mandrel (30) comprises an insert (67) made of a material with high thermal conductivity, set in a housing (50) made in the end fitting (31) and emptying onto a free end face (32) of the former, with the insert (67) extending up to the point facing the radiator (51).