Patent ID: 9550220
Date: 2017-01-24
CPC Classifications: B21B

Claim:
1. A rolling stand, defining a rolling axis, comprising a support structure, a roll holder cartridge configured to go from a working position inside the support structure, at said rolling axis, to an extracted position outside the support structure with a transverse movement with respect to the rolling axis, three rolling rolls, each of which having a respective yoke support, arranged in the roll holder cartridge with axes thereof arranged at 120° with respect to one another, a first rolling roll of said three rolling rolls having rotation axis thereof arranged vertically, at least one hydraulic capsule for each rolling roll fixed to the support structure, for adjusting a radial position of the respective rolling roll, the hydraulic capsule having a respective thrust cylinder and being configured to allow the respective thrust cylinder to cover a distancing stroke from the rolling axis sufficient to allow to clear the path of the roll holder cartridge between the working position and the extracted position, wherein the roll holder cartridge has a longitudinal open slot with a central axis that coincides with a longitudinal central axis of the yoke support of the first rolling roll, and a width in vertical direction greater than a diameter of a tube being rolled, said longitudinal open slot being closed at a first end near the rolling axis and open at a second end opposite to the first end and coinciding with a side of the roll holder cartridge, considering the position assumed by the roll holder cartridge when it is inserted in the rolling stand.