DE1796296B2 - DEVICE FOR CONTROLLING THE THICKNESS OF A METAL COVER WHEN COVERING A METAL STRIP - Google Patents

Description

This cover has openings for on and off. 60 According to a further embodiment of the invention run the tape into the tub. The disadvantage is one or both nozzles with respect to the entdieser The device consists in the fact that with changing speaking tape surface, namely in a to the parameters, such as the bath temperature, the strip-beam direction parallel plane, adjustable. Other prepared, the belt thickness and the belt speed on the side or in addition can also be the distance between or the like, not simple means a corresponding 65 the nozzles are maintained and the distance Regulation or no simple control at all between the nozzle and the strip by an element, the layer thickness of the metal coating made z. B. a leadership role attacking the tape, can be. Although it is possible to change the pressure.

3 4

The above-mentioned movement of the nozzles is re-introduced by flowing soles without vortex formation

Slideways facilitated the back parallel to the band melt pool 16. Another advantage of the im

normal course. As a drive element to the essentials at right angles to the belt surface

set and fix the nozzles are used in particular directed jet impact is that the

Spindle drives. ₅ Distance from the nozzles 24, 26 to the belt 18

On the basis of the drawing, the following examples are small, for example 1.25 cm, can be selected,

explained in more detail for the invention. This is where the angle of incidence differs by, for example, 10 °

Fig. 1. A schematic representation of a front of the tape normal, so that a considerable correction according to the invention in cross section, path component of the superheated steam

F i g. 2 a section through the control zone xmd which is directed xo opposite to the direction of belt movement,

in this and in the vicinity there is a higher gas pressure compared to the essentially

Components, Ii ₀ I _16n hit the strip surface at right angles.

F i g. 3 a section through a gas jet required in the invention. In addition, after

used nozzle on an enlarged scale and below directed gas jet and the mentioned

F i g. 4 shows a view of a nozzle with a part 15 of a small distance between the nozzles 24, 26 from the surface

of the belt passing behind it. of the molten bath 16 a turbulence on the surface

According to FIG. 1, the continuous belt 18, of the same to a depth of about 30 cm, for example a steel belt, is achieved by a cleaning which can be practically avoided if the and / or heating device 12 and a duct 14 follow the gas jet the invention is chosen,
With a regulated atmosphere and a deflection roller in ao In practice, however, because of the slight incidence of the molten bath 16, which is not possible due to the molten fluctuations in the band outline, a zenen metal with which the band 18 is covered with a really right-angled angle of incidence of the beam target. The temperature of the belt 18 is higher at all points over the entire bandwidth aufRegel, in particular, some 100 ⁰ C higher than rechtzuerhalten, so that deviations in the Größendie ambient temperature and when the molten bath 16, as the order of some degrees downwards, or so that this heat can be accepted continuously upwards by the band 18. Thereby are being fed. The temperature of the molten bath 16, the angular deviations when the beam is inclined upwards and whose surface is not as critical to the surrounding gas atmosphere as when it is inclined downwards, tends, for example, at different angles Belt 18, at 30 belt 18 when moving through the control zone ge-temperature changes of the same, with differentiation is forced to move exclusively in the longitudinal direction borrowed belt speeds and similar para- without vibrating to the side. To meter changes also to changes, so that for this purpose it is advisable that the belt 18 is sufficient to itself depending on the change in the melt spans and possibly further guide rollers, bath temperature and thus the consistency of the same 35 for example the guide roller 28, in the vicinity of the also different coatings on the belt 18 control zone, but still in the weld pool 16 to be specified. Such changes can be easily compensated for by the invention, provided that there are no other guide roles. For example, the guide roller 30, in the area of the

In the molten bath 16 there is an outlet which has already solidified metal to attack the strip 18. the

area 20 with a temperature control unit 21, 40 guide roller 28 is in particular freely rotatable and

a deflection roller 22 and a guide roller 28 are not driven themselves. Your distance from the

Nozzles 24, 26 located above the surface of the melt pool 16 are, for example, 17.5 or 20 cm,

in the vicinity of the belt 18, the control zone in which so that the uppermost part of the guide roller 28 is still about

the nozzles 24 and 26 with the gas control devices are located 5 to 7.5 cm below the surface of the molten bath 16

services V are located. The belt 18 is located through this 45.

Control zone in a practically vertical plane upwards According to FIG. 2, the belt 18 through the guided up to a deflection roller 23. Below the guide roller 28 parallel to the surface of the melt same engages an upper guide roller 30 on the belt 18 bath 16 is moved so that the belt 18 at a point where the molten metal has more or less solidified from its between the deflectors is. In order to roll this faster to solidify to 50 22, 23 predetermined position is deflected, bring a cool gas jet over the nozzle 32. This also changes the distance of the directed at the belt 18. Band 18 from the nozzles 24, 26 possible, d. i.e. that

Through the outlet openings of the nozzles 24, 26 while maintaining the distance between the nozzles 24,

If a jet is in particular superheated 26, the distance between the strip 18 and a nozzle 24 occurs

Steam to the appropriate side of the belt 18 55 cost of the distance from the belt 18 to the other

directed. It is ensured that the nozzle 26 is enlarged when the guide roller 28

Gas jet is shifted evenly over the full width of the to the right. The nozzles 24, 26 are

Belt 18 extends and extends in the direction of movement in also parallel to the surface of the melt pool

of the belt 18 is only supported over a short distance, for example 18 arranged sliding guides 34,36,38,40,

limited to 125 to 325 μΐη. It is useful 60 so that the nozzles 24, 26 with respect to the belt 18

moderately, the nozzles 24, 26 can be moved near and away from the weld pool. With

16, for example 10 to 12.5 cm above the same, each nozzle 24, 26 is for adjusting the distance

to arrange. It is also useful down between the belt 18 and the corresponding

Directional nozzles should be avoided, since otherwise no quiet nozzles 24, 26 and a spindle drive 42, 44 are provided. the

Bath surface can be achieved. Are the nozzles 24, 65 adjusting means are at both ends of the longitudinal

26 arranged in the manner according to the invention, so the extension of the nozzles 24, 26 is mounted and with scales

that is retained by the gaseous barrier and can be used by the same device.

Molten coating metal in the form of a smooth side can be served. Both the nozzles 24,

26 and their holders or sliding guides 34, 36, A (total length of the nozzles) 1.467 m

38, 40 are mounted in frame members 46 48, the _C (distance between the feed openings) 45.7 cm
are separable in order to remodel the device without

Cut off the continuous strip 18 to provide ^D (total length of the outlet opening possible. The frame member 46 is with an arm 49 5 opening) 1.371 m

for mounting the guide roller 28 on the underside £ (depth of the outlet opening) .... 1.27 cm '

Mistake. The lateral deflection of the band 18 _iV .

from the vertical plane is shown in FIG. 2 exaggerated ^F ( ^Tlef ^ ^d f transition area

shown. ^{In practice, a v0} "of the outlet opening to the tape 18 is

Force from a lateral movement of about 7.5 cm ^{(the height of the} gas distributor) 1.27 cm

between the position on the pulley 22 and the G (depth of the gas distributor) 3.81 cm

Leadership role 28 exercised. The belt 18 moves _{R (Brdte of the exit opening)} ... _{0 38 mm}
nevertheless still essentially vertical, since the lateral deviation compared to the total length. the gas pressure or by means of the distance between the nozzle 70

The temperature of the weld pool 16 at the point regulated by the belt IG or by means of both measures

at which the beam impinges on the belt 18 is. As already described above, the

expediently about 427 ^° C. if zinc is essentially at the same temperature as the coating material

Steel tape is applied. As a galvanizing material 20 kept constant. Higher belt speeds,

Lines are used that also contain aluminum - lower gas pressure and greater distances between

Additions and contamination of lead, antimony, nozzle 70 and strip 18 result in greater layer thicknesses.

Include cadmium and the like. The melting temperatures Lower belt speeds, higher gas pressures

Such galvanizing materials are located in the and smaller distances between nozzle 70 and belt 18

Against 421 ^° C. The temperature in the outlet 25 results in lower layer thicknesses. Generally will

region 20 is, for example 427 to 46o ⁰ C and the belt speed based on other

is expediently chosen within the limits of 4 to limiting factors, namely for example

H ⁰ C kept constant between 440 and 449 ^{0 C.} wise due to the glow or tempering power of the

In Fig. 3 and 4 are details of the nozzle system, and the system usually comes with the shown. The nozzle 70 has two jaws 72, 74 30 largest, taking into account such limited, the rate available to a gas manifold 76 is the expansion of large factors complement in one direction. The cheeks drifted. It is desirable to be as small as possible 72, 74 are maintained by a series of screws 78 gas pressure regardless of connected with each other. The distance between other related factors of the over-same determines the opening width of the nozzle 70; 35 draft control, however, either the gas pressure it is set by spacer plates 80. That and / or the nozzle spacing to compensate for Gas is fed through a plurality of feed openings 82 in changes with respect to the desired layer thickness Gas distributor 76 initiated, so that a substantial coating can be changed. According to the invention lent uniform gas pressure over the full length, therefore, the change in the nozzle spacing is predicted Gas distributor 76 adjusts. The gas is drawn through the 40 elongated to the lowest possible gas pressure Slit-shaped outlet opening 84 from right and an over- or under-correcting the nozzle 70 off, so as to prevent the angle between when using manual adjustment. Gas inlet and outlet from the nozzle 70 essentially. With automatic control, the distance and is a right one that easily changes the gas pressures for good and even pressure if necessary division of the gas mass and the gas pressure over the 45 are to be within a selected low entire length of the outlet opening 84 ensures. Typical print area is the For dimensions placed on the cover are about the following: requirements to be met.

1 sheet of drawings

Claims (5)

t 2 of the gas flowing through the outlet openings Patent claims: to be controlled independently of the respective other outlet opening, so that with different jets 1. Device for controlling the coating dioke is worked, the tape is through the over one Metal coating when coating a metal 5 weight of the stronger beam shifted so that it is in tape, in which the mechanical contact from the molten metal bath with the wall of the perpendicular outgoing band passes through the nozzle block immediately in the upper right-hand channel, the half of the weld pool before solidification of the not yet solidified metal coating is therefore there Metal coating to partially remove the excess from one wall of the nozzle block Metal passed a nozzle device, stripped off. It has also been shown that with others the gas or steam as narrow, straight, previously known devices of a similar type unequal-jet blows onto the flat surface of the strip, causing metal coatings to appear as the metal penetrates characterized in that the nozzles melt is distributed in a cascade manner. (24, 26) are arranged such that the beam in the The invention is based on the object that essential at right angles to the strip surface 15 to control the layer thickness with simple means and occurs and that the distance between the nozzles, if necessary, to changing parameters such (24,26) and the belt surface while maintaining the immersion process, without a practical the beam direction is adjustable. significant scrap of unvented 2. Apparatus according to claim 1, thereby yielding coated strip material,
indicates that the nozzles (24, 26) parallel to the zo The invention consists in that the nozzles are adjustable in such a bath surface. are arranged so that the beam is substantially 3. Apparatus according to claim 2, characterized in that it strikes the strip surface at right angles and that indicates that the nozzles (24, 26) are in sliding distance between the nozzles and the upper belt guides (34, 36, 38, 40) are adjustable. adjust the area while maintaining the beam direction. 4. Apparatus according to claim 2 or 3, there being 25 bar. characterized in that the nozzles (24, 25) Although the invention is also not at right angles are adjustable by spindle drives (42, 44). Impact of the gas jet on the strip surface 5. Device according to one of the preceding reproducible solutions to the stated problem Claims, characterized in that the leads, the problem solving succeeds with joint Distance between the band (18) and the nozzles (24, 26) 30, the two partial features are particularly effective. can be changed by a guide roller (28). In the above, under "essentially right-angled" Understood meaning that the jet with no essentials when the nozzles are arranged close to the molten bath Component towards the enamel surface 35 flows, as this would otherwise be disturbed. Rather, the beam hits practically at a right angle or The invention relates to a device slightly upwards, i. H. with a component in to control the coating thickness of a metal strip movement direction, on the strip surface. Coating when coating a metal strip, with small angles of incidence in the opposite direction, d. H. The fact that it is stretched out of the molten metal bath and directed downwards by about 5 ° disturb those who step into the bath Band directly above the weld pool surface is practically not yet either. if the Before the metal coating solidifies, nozzles are relatively far from the weld pool to remove them excess metal are arranged on a nozzle device, this angle is not so critical either, has passed, the gas or steam as a narrow one but the gas jet blows straight onto the flat belt surface. 45 surface in the control zone considerably downwards Such a device is already known to be inclined; H. the gas jet hits under one of (French patent 873 608). There is the 90 ° significantly different angle of incidence on the Nozzle device from a nozzle block, in which the band on, then also leads to a change in the He-Gas- or introduce steam lines in and not yet to a satisfactory one due to the distance mentioned reach nozzle-like gaps in a central channel, 50 solution of the problem mentioned, since the point of impact by which the stretched tape is displaced in the vertical direction of the beam. Then there is the is pulled up. The nozzles are at a risk of plating metal along the belt angles directed downwards from about 45 ° and have edges accumulating. The mentioned angle of incidence causes a component directed towards the bath surface In addition, avoids turbulence in the melt run, which is about the same size as that parallel to the bath in the strip exit area, which is too unclean Bath surface, d. H. would lead to the tape coatings at right angles. The beam is supposed to impinging. Cover the entire bandwidth, but very sharply The nozzle block is attached to a cover, be pronounced and z. B. only a thickness of 0.38 mm which covers a trough having the molten bath. exhibit.