DE2415841A1 - METHOD AND DEVICE FOR STRIPPING A TAPE PRODUCT - Google Patents

Description

ESCHER VJYSS G.M.B.H., Ravensburg (Württbg.)

Method and device for stripping a strip-like product

The present invention relates to a method and an apparatus for stripping a strip-like product, for example of wires, metal strips, metal pipes and metal profiles, in an acidic or basic treatment bath.

The currently known pickling plants work with different pickling processes, i.e. pickling in bundles or rings, or Pickling in a continuous process.

The manual or mechanized systems of the former type are suitable for pickling wire wreaths with a unit weight of no more than 500 - 600 kg. At higher weights However, great difficulties are encountered, in particular with regard to the handling of the wire rings to be pickled and the pickling of their inner wire turns. Certain novel processes nevertheless make it possible to overcome the latter disadvantage to avoid, but also with these methods the problem of the heavy handling of the wire rings remains higher weight unresolved.

Of course, these difficulties do not arise with the continuous pickling process. But these plants have other disadvantages

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parts, especially with regard to the duration and speed of operation of the product to be pickled. In order to solve these problems, one would have to use extremely long bath tanks provide for what is not possible in practice.

The object of the present invention is therefore to shorten the pickling time significantly, so that high drainage speeds can be achieved. can achieve properties in connection with bath tanks of relatively limited length.

The subject of the invention is therefore a continuous pickling process, that is characterized by the fact that during the run? of the product to be stripped through the treatment bath in the same an electromagnetic field through a or several coils arranged in the vicinity of the bath or immersed in it, through which a high-frequency current flows is produced. Practical tests have shown that under these circumstances one can significantly shorten the pickling time achieved.

The invention also relates to a device for carrying out the method according to the invention. Two exemplary embodiments of such a device are described below with reference to the accompanying drawing. In the drawing show:
1 shows a schematic vertical section through a first embodiment of a pickling plant according to the invention; and

2 shows a corresponding representation of another exemplary embodiment.

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In the execution form according to Pig. 1, the pickling plant ■ consists of a container 1 which contains the treatment bath 2. The bath container 1 is an overflow container which is surrounded by a channel j5 which serves to catch the part of the bath which overflows from the bath container. A circulation system K with a pump 5 enables the liquid collected in this way to be returned to the bath container 1.

The product to be stripped runs through the total length of the Bath container, such as the wire 5a, which is unwound from a supply reel 6 and then on a take-up reel 7 is wound up.

The bath tank 1 contains an induction coil 8 which is immersed in the bath and powered by a high frequency current is run through. The electrical conductor of which this coil is made, however, is enclosed in a tube 9; this consists of a material that withstands the attack of the treatment bath, so that the coil before the Aggressiveness of the bath is protected. A cooling water circuit can of course be provided within this pipe 9 will.

The shape of the induction coil 8 can be selected as desired. However, it can vary depending on the type and shape of the material to be stripped off Product. For example, in the embodiment according to FIG. 1, the windings of the coil surround the path that the wire 5a to be stripped is to traverse. The ends of the induction coil are connected to a high frequency power generator 10 of any kind connected.

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'6 mm 8th mm 12th mm

The frequency of the current passing through the induction coil can be between 50,000 and 800,000 Hz. The carried out Tests have shown that the pickling time in Compared to the values that are observed in the classic pickling systems, it is significantly shortened.

For example, when using a * 12 kW generator that produced a current with a frequency of 70,000 Hz, the Pickling of hot-rolled carbon steel wires in one Hydrochloric acid bath achieves the following results:

Wire diameter pickling time

2 seconds k seconds 8 seconds

For a wire with a diameter of 18 mm from another Steel grade, the pickling time was 8 seconds.

For the same wires, the pickling time is in a classic system without a high-frequency induction coil, depending on the type of wire rolling, to a multiple of this Values.

Of course, the temperature and / or the concentration of the treatment bath must take into account the supply of heat can be adjusted by the induction coil.

The frequency and power of the generator can be taken into account of the following factors can be selected:

- Type of products to be stripped

- Original surface condition of the same and surface condition to be achieved

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- running speed

- shape of the product

Incidentally, the device for performing the erfindungsgeraässen Procedure, as already said, can be carried out in other forms.

In the embodiment according to FIG. 2, the wire to be treated 5a runs in a closed sheath la, which has the corresponding Contains pickling bath 2a.

A circuit is provided for the bathroom. The circulation has a drainage line 11 which is connected to one end of the shell la and leads into the recovery tub Ί2. A return line is attached to the tub 12 13 connected to a pump 14 to the Liquid returned to the other end of the envelope la.

In this embodiment, an induction coil 8a is arranged outside the treatment bath, its windings surround the shell la. As in the first exemplary embodiment, the ends of this coil are attached to a high frequency current generator 10 connected.

Although in this embodiment the induction coil 8a is not immersed in the pickling bath, it has an effect on the bath by inducing an electromagnetic field in it. As in the above case, there is a substantial shortening the pickling time. As already said, this is the main advantage of the inventive method and the Device for its implementation. This makes it possible to produce products in the form of wires, tubes in a continuous process

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or profiles with the help of systems of short length and pickling with small space requirements.

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Claims (4)

~ ⁷ ~ Patent to s ρ r ü c h e \ Ihirchlaufbeizverfahreh for stripping a tape-like \ J product, for example from wires, metal strips, metal pipes and metal profiles, in an acidic or basic treatment bath, characterized in that while the product to be pickled runs through the treatment bath in the same an electromagnetic field by one or more arranged in the vicinity of the bath or immersed in this, through which a high-frequency current passes coils is generated. 2. Device for performing the method according to claim 1, characterized in that that one or more induction coils (8, 8a) are provided in the vicinity of the treatment bath (2, 2a) arranged or immersed in this, the Induction coils are connected to one or more high-frequency current generators (10). 3. The method according to claim 1, characterized in that that the frequency of the current passing through the induction coil is between 50 * 000 and 800,000 Hz. 4. Apparatus according to claim 2, characterized e i without t that the windings of the induction coils (8, 8a) surround the path that is to be stripped Product (5a) passes through. Blank page