Cleaning and liquid contact with solids – Apparatus – For sheet – web – strand or bar form work – longitudinally...
Patent
1988-07-22
1991-01-22
Stinson, Frankie L.
Cleaning and liquid contact with solids
Apparatus
For sheet, web, strand or bar form work, longitudinally...
134200, B08B 304
Patent
active
049862910
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for the surface treatment of strips with liquids, in particular for pickling rolled metal strip.
In a large number of strip rolling mills production requirements arise for which the pickling problem, due to the nature and size of the hot strip to be pickled cannot be solved readily. However, frequently the conditions are such that these productions, having regard to their tonnages and the demands made on the surfaces to be pickled on the one hand require the continuous passage of the strip through the pickling plant providing the treatment, what is known as continuous pickling, but as such cannot be applied because of widely varying strip dimensions or poor welding properties.
For such conditions a modern pickling plant known as push-through pickling is now available.
In principle such plant is characterised in that the hot strip, optionally with the simultaneous passage of several strips, is pushed through the plant, whereby the qualitative advantages of a continuous pickle are attained in a simple manner.
The known push-through pickling plants comprise a longitudinal pickling vessel of trough-shaped cross section which is optionally provided with partitions for the simultaneous treatment of several strips, dividing the trough into a plurality of parallel channels and which can be inserted into or lifted from the vessel depending on the desired channel width. The strip is for example pushed through the vessel, flooded with pickling acid, by means of a straightening machine provided at the entry into the pickling vessel. In this context it is known for example to inject the pickling acid from the bottom, whereby the strip is also supplied on its underside with fresh pickling acid and is guided through the pickling vessel. The pickling vessel is conventionally closed by a cover which according to DE-OS No. 30 00 40 can be provided on the bath side with box-shaped inserts dipping into the pickling bath in order to reduce the surface area of the bath, thereby reducing energy consumption, which is caused to a major extent by the evaporation of the pickling acid. In order to protect the immersed cover against damage due to the strip, abrasion protection ribs are provided which on the surface of the inserts facing the bath extend transversely to the direction of movement of the strip.
In operation of the push-through pickling plants it was observed that particularly during the entry of the beginning of the strip, at relatively high travelling rates of the strip, damage may be caused to the cover due to whiplash-like rising upwards. If anti-abrasion strips are fitted extending transversely to the direction of travel of the strip, the front end of the strip may hit these, rip them off and/or itself suffer damage.
It is an object of the invention to provide an expedient to mitigate the last mentioned risk. This object is attained in an apparatus of the type described in the introduction, in which the strip being treated is guided through a trough-shaped vessel, in that according to the invention above the strip a guide means is provided which guides the strip into the desired direction of movement if it rises upwards.
This allows throughput velocities exceeding 200 m/min to be attained.
Such a means may for example be a cover provided with sawtooth-like profiles facing the direction of movement of strip with a chamfer. According to one embodiment such profiles may be formed by a succession of rails, guide beams, plates or the like of wear-resistant material inserted into the pickling vessel and which are chamfered on the side from which the strip enters. These rails, guide beams, plates or the like may, except for the chamfering, have a rectangular cross section and extend transversely to the strip movement, being subdivided or in one piece.
It stands to reason that other constructional solutions, such as, for example, in the form of deflecting devices, may be employed. Thus it is possible to employ instead of the guide beams or the like, successions of rollers which may be fre
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Deyer Johann
Hula Emil
Maschinenfabrik Andritz Actiengesellschaft
Stinson Frankie L.
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