Coating apparatus – With heat exchange – drying – or non-coating gas or vapor... – With housing surrounding or engaging coating means
Patent
1988-03-14
1989-12-05
Beck, Shrive
Coating apparatus
With heat exchange, drying, or non-coating gas or vapor...
With housing surrounding or engaging coating means
118 63, 118419, 118429, 427433, 4274343, B05C 1100
Patent
active
048845256
DESCRIPTION:
BRIEF SUMMARY
DISCLOSURE
The invention relates to an installation for zinc coating or galvanizing one or both sides of a continuous flow of steel strip which, through a duct in which a protective gas atmosphere prevails and which is connected to the furnace, is directed to a vessel filled with liquid zinc and where, for the purpose of bilateral zinc coating, it is guided around a deflector or guide roll disposed within the zinc bath and, optionally, stabilising rolls or, for the purpose of unilateral zinc coating, it is directed around at least one deflector or guide roll, which is disposed above the surface of the zinc bath inside a housing flange-mounted in gas-tight manner on the duct, in the same direction as with bilateral zinc coating, the guide roll being associated with a coating roll immersed in the zinc bath.
BACKGROUND
The constantly increasing demand in the last few years for steel strip which has been zinc-coated on one side, in particular for processing as car body sheet, has resulted in a greater need for installations which can produce strip of this type. However, since there is still a considerable demand for bilaterally galvanized steel strip, modern coating installations should be able to produce both types of coated strip, wherein the conversion from one-sided to two-sided coating should take place as rapidly as possible and at low cost.
An installation for one-sided and two-sided coating has been proposed (DE-A 33 13 218), of the type described above. This installation enables both one-sided and two-sided coating to be carried out satisfactorily but the change-over from one process to the other means that the installation has to undergo a series of conversion measures which are very costly in respect of labour and time. Moreover, a substantial break in production has to be taken into account since no treatment of the strip can carried out at that time.
It has also been already proposed (EP-A 0 064 922) to develop an installation for one and two-sided zinc coating in such a way that by conveying and pivoting a wide variety of installation components it is possible to carry out both process stages with the same installation. However, this installation has the disadvantage of very complex mechanical and kinematic mechanisms which, in the event of breakdowns, result in even longer installation down-times and production stoppages. This also applies when parts of the installation have to be maintained, replaced or cleaned.
SUMMARY OF THE INVENTION
Starting from the known state of the art, it is the object of the invention to devise an installation for zinc coating one or both sides of a continuous flow of steel strip, which is of simple construction but allows a rapid change-over of the installation from one process to the other, even with the strip material in place.
To achieve this object it is proposed, according to the invention, that the flanged connection between the duct and the housing can be readily released and in the course of two-sided zinc coating the housing can be replaced by a support for the guide roll, the mounting of which corresponds to that of the housing.
Therefore, the basis of the invention is the interchange of complete "kits" for one-side and two-sided zinc coating, each "kit" including in fully prepared form the components required for the respective process stages.
According to another advantageous feature of the invention, it is proposed to effect the mounting via a housing part which is arranged on the support and which encloses the strip on three sides and is open both towards the duct and the zinc bath, in which the lower zone of the housing part is immersed. In this way, firstly the required gas-tight connection is assured between the duct leading out of the furnace and the zinc bath and, secondly, it is ensured that the part of the installation intended for two-sided zinc coating can be withdrawn without cutting the strip. According to a further feature of the invention, another solution has the same aim and provides for the housing to be in two parts and for the p
REFERENCES:
patent: 3643627 (1972-02-01), Killin et al.
patent: 4374873 (1983-02-01), Piedboeuf et al.
patent: 4408561 (1983-10-01), Yokoyama et al.
patent: 4446812 (1984-05-01), Wang
Patent Abstracts of Japan, vol. 7, No. 175, (c179) (1320), 8/3/83, Abstract-8 JP, A, 588/960, 5/17/83.
Fontaine Paul
Frommann Klaus
Michel Rolf
Bashore Alain
Beck Shrive
Fontaine Paul
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