Rolling mill for rolling metal products

Abstract

A rolling mill for rolling metal products, comprising two roller stands with a stand cross-member. A roller is rotatably mounted in the roller stands. The roller is operatively connected to a balancing cross-member, and at least one hydraulic piston-cylinder system is arranged in the stand cross-member, with which a tensile force can be generated between the stand cross-member and the balancing cross-member by the hydraulic piston-cylinder system. In order to prevent leakages in particular in the event of tall mill ascending paths, the piston-cylinder system has a cylinder housing with an upper axial end and a lower axial end. A piston is movably arranged in the cylinder housing, and the piston protrudes beyond the cylinder housing both at the upper axial end as well as at the lower axial end in each operating state.

Claims

1. A rolling mill for rolling metal products, comprising: two roller stands with a stand cross-member, wherein a roller is rotatably mounted in the roller stands, wherein the roller is operatively connected to a balancing cross-member, and wherein at least one hydraulic piston-cylinder system is arranged in the stand cross-member, with which a tensile force can be generated between the stand cross-member and the balancing cross-member, wherein the piston-cylinder system has a cylinder housing with an upper axial end and a lower axial end, wherein a piston is movably arranged in the cylinder housing, and wherein the piston protrudes beyond the cylinder housing both at the upper axial end thereof and at the lower axial end thereof, during an operating state, wherein the connection between the stand cross-member and the balancing cross-member is established via a pull rod that is connected to the piston and the balancing cross-member, wherein the pull rod is releasably connected to the piston, wherein a locking mechanism is provided for the releasable connection.

2. The rolling mill according to claim 1, wherein two piston-cylinder systems are arranged symmetrically to a central plane of the roller stands.

3. The rolling mill according to claim 1, wherein the piston has a first external diameter in an upper section, wherein the piston has a second external diameter in a lower section which is smaller than the first external diameter.

4. The rolling mill according to claim 1, wherein the pull rod passes axially through the piston and is fastened to the piston in an upper region thereof.

5. The rolling mill according to claim 1, wherein the locking mechanism is arranged on the cylinder housing.

6. The rolling mill according to claim 1, wherein the locking mechanism comprises a pivot drive which causes locking or unlocking by a pivot movement.

7. The rolling mill according to claim 1, wherein the locking mechanism comprises a cover hood which covers the locking mechanism inaccessible from the outside.

8. The rolling mill according to claim 1, wherein it is a roughing mill stand or a heavy plate rolling mill in a hot rolling mill.

9. The rolling mill according to claim 2, wherein the piston has a first external diameter in an upper section, wherein the piston has a second external diameter in a lower section which is smaller than the first external diameter.

10. The rolling mill according to claim 2, wherein the connection between the stand cross-member and the balancing cross-member is established via a pull rod that is connected to the piston and the balancing cross-member.

11. The rolling mill according to claim 5, wherein the locking mechanism comprises a pivot drive which causes locking or unlocking by a pivot movement.

12. The rolling mill according to claim 5, wherein the locking mechanism comprises a cover hood which covers the locking mechanism inaccessible from the outside.

13. The rolling mill according to claim 6, wherein the locking mechanism comprises a cover hood which covers the locking mechanism inaccessible from the outside.

14. The rolling mill according to claim 2, wherein it is a roughing mill stand or a heavy plate rolling mill in a hot rolling mill.

15. The rolling mill according to claim 3, wherein it is a roughing mill stand or a heavy plate rolling mill in a hot rolling mill.

16. The rolling mill according to claim 4, wherein it is a roughing mill stand or a heavy plate rolling mill in a hot rolling mill.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) FIG. 1 a rolling mill and specifically the upper part of the same, wherein the rolling direction of the material to be rolled is perpendicular to the plane of the drawing and

(2) FIG. 2 the part of the rolling mill according to FIG. 1 seen from the direction “A” as marked in FIG. 1.

DETAILED DESCRIPTION

(3) In the figures, a rolling mill is 1 to see which comprises at least one, typically two roller stands 2. In the upper area of the rolling mill 1, a stand cross-member 3 is arranged. The roller 4 can be seen in the lower area of the figures (it should be noted here that the rolling mill 1 shown in the figures continues downward, although this is not shown).

(4) Above the roller 4, but below the stand cross-member 3, a balancing cross-member 5 is arranged. This acts indirectly on the roller 4 and exerts balancing forces on it. This technology, which is well known per se, is described in detail in the above-mentioned documents, so that reference is expressly made to it.

(5) The balancing forces are generated by two piston-cylinder systems 6 which—as FIG. 1 shows—are arranged symmetrically to a central plane M of the roller stand 2, but spaced apart from this central plane.

(6) The structure of the piston-cylinder systems 6 and of a locking mechanism 12, 13, 14, 15, with which locking can take place, as described in EP 1 907 143 B1 already mentioned above, can be seen from the figures.

(7) According to this, each piston-cylinder system 6 has a cylinder housing 7 which has an upper axial end 8 and a lower axial end 9. At the upper axial end 8, the cylinder housing 7 is closed by a cylinder cover 16. The cylinder housing 7 is penetrated by a piston 10 in such a way that the piston 10 is displaceably arranged in the cylinder housing 7, wherein this protrudes, i.e. completely penetrates beyond the cylinder housing 7 both at its upper axial end 8 and at its lower axial end 9 in each operating state. In this way, a high degree of stability is produced, which is given when the piston 10 moves relative to the cylinder housing 7.

(8) It can best be seen from FIG. 2 that the piston 10 has an outer diameter D in its upper region which is greater than the outer diameter d of the piston 10 in its lower region. As a result, a hydraulic chamber is formed in the interior of the piston-cylinder system 6, to which hydraulic fluid can be applied.

(9) The piston 10 is hollow and is penetrated by a pull rod 11. The pull rod 11 is connected above the piston 10 at its upper axial end to the piston 10 in a lockable manner. At its lower axial end, the pull rod 11 is connected to the balancing cross-member 5.

(10) In the exemplary embodiment, the locking mechanism comprises a locking sleeve 12, a locking piece 13, a cover hood 14 and a pivot drive 15. The pull rod 11 can be locked or unlocked with the upper end of the piston 10 by a pivot movement of the pivot drive 15.

(11) A pivot bearing 17 is placed between the locking piece 13 and the piston 10. The cover hood 14 ensures that the moving parts are not accessible from the outside; accordingly there is no risk of accident.

(12) The pull rod 11 is connected to the balancing cross-member 5 by means of a pivot bearing 18, an end piece 20, an anti-rotation device 19 and a cover 21.

(13) An essential element of the proposed construction is therefore the completely penetrating (in particular hollow) piston 10 which penetrates the cylinder housing and which is safely guided even with large openings, i.e. with a large cylinder stroke. The pull rod 11 is guided through the piston 10 and fastened with its lower end to the balancing cross-member 5. The connections between the pull rod and the adjacent components are articulated (by means of axial pivot bearings 17 and 18). This reduces the stress on the cylinder from the rolling process; the cylinder can be exchanged with little effort. The balancing cross-member and the pull rods can remain in the scaffolding for this purpose.

(14) Due to the compact design, a closed stage construction can be achieved, which is necessary for scaffolding types with extraction (for non-ferrous metals and stainless steel). The effort for this is significantly reduced. Due to the integrated design, no moving parts are accessible, which means that measures to shut off the balancing (e.g. using fences) can be omitted. Additional devices for locking the balancing can also be omitted.

(15) The cylinders can be serviced and exchanged with little effort, without having to dismantle the balancing cross-member and the pull rods. The compact design also enables the flexible arrangement of components on the scaffolding platform (e.g. drive components for mechanical adjustment and valve stands).

LIST OF REFERENCE SIGNS

(16) 1 rolling mill

(17) 2 roller stands

(18) 3 stand cross-member

(19) 4 roller

(20) 5 balancing cross-member

(21) 6 piston-cylinder system

(22) 7 cylinder housing

(23) 8 upper axial end of the cylinder housing

(24) 9 lower axial end of the cylinder housing

(25) 10 pistons

(26) 11 pull rod

(27) 12, 13,

(28) 14, 15 locking mechanism

(29) 12 locking sleeve

(30) 13 locking piece

(31) 14 cover hood

(32) 15 pivot drive

(33) 16 cylinder cover

(34) 17 pivot bearing

(35) 18 pivot bearing

(36) 19 anti-rotation device

(37) 20 end piece

(38) 21 cover

(39) M central plane of the roller stand

(40) D first external diameter of the piston

(41) d second external diameter of the piston