Method and device for coating a metal strip with a coating material which is at first still liquid

Abstract

The invention relates to a method and to a device for coating a metal strip with a coating material which is at first still liquid, for example zinc. Known devices of this type comprise a coating container (110) with the liquid coating material (300). The metal strip (200) is passed through the coating container in order to be coated. After the metal strip (200) exits the coating container, the still liquid coating material adheres to the metal strip (200); excess coating material (300) is then blown away from the surface of the metal strip (200) by a blowing device. After the blowing device, the metal strip runs through an electromagnetic stabilisation device which is conventionally supported on the blowing device (120). Owing to disturbing influences, it might be necessary for the metal strip to be guided within a slit (122) of the blowing device (120) no longer in a predetermined, set middle position; in these cases, a displacement or re-alignment of the blowing device (120) is then required to guide the metal strip back to the set middle position. In order to avoid in this case an undesirable displacement of the electromagnetic stabilisation device, the invention comprises a first displacing device for displacing the electromagnetic stabilisation device (140) relative to the blowing device (120) in the plane transverse to the direction of transport of the metal strip.

Description

technical field [0001] The invention relates to a method and a device for coating a metal strip with an initially liquid coating material, for example zinc. The method and device are used in particular for hot-dip galvanizing of metal strips. Background technique [0002] Such devices for coating metal strips are basically known in the prior art, for example from DE 10 2009 051 932 A1. This document discloses in particular a paint container which is filled with a liquid coating material. For coating, a metal strip is guided through a container with coating material. After leaving the paint container, the metal strip passes through a blowing device arranged above the paint container for blowing excess portions of the still liquid coating material off the surface of the metal strip. An electromagnetic stabilizing device supported by the purging device for stabilizing the metal strip after leaving the paint container and the purging device is arranged above the purging devic...

AI Technical Summary

Problems solved by technology

Transferring the purging device in this way has the disadvantage, however, that the electromagnetic stabilizing device is correspondingly transferred as a result, since the electromagnetic stabilizing device is generally as described, for example, in DE 10 2008 039 244 A1 (except in the vertical direction degrees of freedom above) are firmly connected to and supported on the purge device

However, the above-mentioned disturbances in the guidance of the metal strip through the slit of the purge device do not necessarily have to influence the guidance of the metal strip through the slit of the electromagnetic stabilization device

Therefore, the simultaneous transfer of the electromagnetic stabilizing device and the purging device described in DE 10 2008 039 244 A1 is in principle undesirable, since it leads to an asymmetrical and thus undesirable force action of the electromagnetic stabilizing device on the metal strip The change

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