Strip deflector and roll assembly

Abstract

The invention relates to a strip deflector for deflecting a rolling medium from the surface of a metal strip. The invention further relates to a roll assembly, comprising a roll, adjacent to which the strip deflector is placed at a distance, and comprising the strip deflector according to the invention. The strip deflector consists substantially of a main body, in which a compressed-air chamber and a nozzle (116) connected to the compressed-air chamber in a flow-conducting manner are formed. The nozzle (116) comprises a first nozzle channel segment (116-I) connected to the compressed-air chamber (114) and a second nozzle channel segment (116-II) connected downstream. According to the invention, in order to improve the sealing action of the strip deflector with respect to the roll in a roll stand, the side wall (116-I-2) facing away from the tip (112) of the main body (110) is bent away from the tip (112) of the strip deflector, a second separation edge (119) thus being formed at the end of the second nozzle channel segment (116-II).

Description

technical field [0001] The invention relates to a strip guiding baffle. A strip guide fence is a shielding device in a rolling mill stand for typically rolling metal strip. During rolling, the rolls are usually loaded with a rolling medium, such as coolant and / or lubricant; the strip-guiding baffles are then additionally used to separate the surface of the metal strip from the coolant or lubricant without contact. The invention also relates to a rolling unit having at least one roller and at least one strip guide bar according to the invention. Background technique [0002] Regarding the earlier prior art, reference is made to European patent applications EP 0 765 696, EP 0 513 632 and EP 1474 253 and US documents US 5 490 300 and US 6 260 287 . [0003] The strip guide fence according to the invention is an improvement of the strip guide fence as disclosed in European patent document EP 0 662 359 . The strip guide apron known from European patent document EP 0 662 359 B1...

AI Technical Summary

Problems solved by technology

[0006] It has been shown in practice that the structural embodiment of the strip guide apron known from document EP 0 662 359 is not completely satisfactory in terms of various functions

In particular, the fact that the fluid (the air is compressed here) has to be accelerated to supersonic speeds in order to achieve the described very high suction effect by means of the Prandtl-Meyer angular flow

As disadvantages should be mentioned on the one hand the very high noise formation associated with the supersonic speed of the compressed air and on the other hand the extremely high and cost-intensive consumption of compressed air which is also associated with it

As a further disadvantage it should be mentioned that due to the pronouncedly rounded delivery area of ​​the known nozzles, the exiting air flow is largely diverted away from the roll surface due to the Coanda effect, so that the sealing effect is only poor

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