Device and method for cooling a cross-cutting shear in hot strip mills

A device (100) for cooling at least one knife-bearing element (102.1, 102.2) of a cross-cutting shear (103) installed in a rolling mill, in particular in a hot rolling mill, comprising:

• a guard device (105);
• and
• a guide device (106) on which the guard device (105) is movably guided and can thus be moved between a cooling position (K) and a cutting position (S),
• wherein the guard device (105) is positioned in the cooling position (K) between a knife-bearing element (102.1, 102.2) and a roll strip (101) which continuously runs through the rolling mill, such that a side of the knife-bearing element (102.1, 102.2) opposite the roll strip (101) is shielded by the guard device (105),
• wherein the guard device (105) in the cutting position (S) is spaced apart from a field of movement (MK) of the knife-bearing element (102.1, 102.2), such that the guard device (105) is not touched by such knife-bearing element (102.1, 102.2) during movement of the knife-bearing element (102.1, 102.2) or during cutting of the roll strip (101),
• wherein the guide device (106) is designed in form of sliding guides (108.1-108.4), which are arranged on both sides of the roll strip (101),
• wherein the guard device (105) is movably guided with its two end faces on the sliding guides (108.1-108.4),
• wherein the sliding guides (108.1-108.4) are attached to inner sides of lateral stand frames (104) of the cross-cutting shear (103),
• wherein a first arc-shaped guide track (109.1) and a second arc-shaped guide track (109.2) are respectively formed in each of the sliding guides (108.1-108.4),
• wherein a path curve, which is defined by the arc-shaped guide tracks (109.1, 109.2), points convexly outwards with respect to an adjacent knife drum (102.1, 102.2), and
• wherein the guide tracks (109.1, 109.2) are arranged in a sliding guide (108.1-108.4) in a partially overlapping manner.

A method for cooling a knife-bearing element (102.1, 102.2) of a cross-cutting shear (103) installed in a rolling mill, in particular in a hot rolling mill, comprising:

• arranging, when the cross-cutting shear (103) is at a standstill, at least one guard device (105) in a cooling position (K) between a knife-bearing element (102.1, 102.2) of the cross-cutting shear (103) and a roll strip (101) which continuously runs through the rolling mill, such that a side of the knife-bearing element (102.1, 102.2) opposite the roll strip (101) is shielded by the guard device (105),
• wherein the guard device (105) is formed in two parts and comprises two shielding elements (110) that are brought in mirror image from an inlet side of the roll strip (101) and from an outlet side of the roll strip (101) into the cooling position (K), in which the shielding elements (110) are positioned adjacent to each other and thereby shield a lower side of the knife-bearing element (102.1) from the roll strip (101),
• wherein the shielding elements (110) each have a trough area (111);
• continuously introducing cooling water into the trough areas (111) while the shielding elements (110) are in the cooling position (K);
• and
• allowing the cooling water to overflows side edges (115) of the trough areas (111) and flow laterally past the roll strip (101) in a downward direction when the trough areas (111) are fully flooded with cooling water.