WO2010057930A2

WO2010057930A2 - Device for removing fluid from the surface of a moving strip and strip processing system comprising such a device

Info

Publication number: WO2010057930A2
Application number: PCT/EP2009/065413
Authority: WO
Inventors: Bernd Berger
Original assignee: Bernd Berger
Priority date: 2008-11-21
Filing date: 2009-11-18
Publication date: 2010-05-27
Also published as: DE102008058513B4; WO2010057930A3; DE102008058513A1

Abstract

The invention relates to a device for removing fluid from the surface of a strip fed from a strip processing system in an operating direction by way of a gas stream directed at the moving strip, comprising at least one outlet nozzle with an outlet opening from which the gas stream exits. In order to improve the cleaning effect and to reduce the required amount of gas and the noise level, it is proposed that the longest extension of the outlet opening of each outlet nozzle is smaller than the width of the strip and that the device comprises means for moving each outlet nozzle at an angle relative to the operating direction of the strip, wherein the speed of each outlet nozzle is greater than the speed of the strip.

Description

Device for removing liquid from the surface of a moving belt and belt processing plant with such a device

The invention relates to a device for removing liquid from the surface of a belt conveyed in a running direction from a strip processing installation by means of a gas jet directed onto the moving belt, with at least one outlet nozzle with an outlet opening from which the gas jet emerges. Furthermore, the invention relates to a tape processing system with such a device.

Devices of the type mentioned are required to remove in particular from high-speed metallic rolling belts residues of the cooling lubricant, which is applied to the strip during rolling and adheres to the rolling process as a residue on the belt. If the removal of the liquid of the cooling lubricant is insufficient, the remainder of the cooling lubricant forms a lubricating film after the band has been coiled to form a band collar between its individual turns. This lubricating film can cause the individual coils of the covenant telescoping, so move during coiling in Haspelachsrichtung. In addition, only very low residue quantities of the cooling lubricant on the surface of the rolled strip are usually allowed for the further processing of the tapes.

It has long been attempted to remove the residue remaining on a belt after a treatment by blowing off, for example by means of air. So is out of the US Pat. No. 3,607,366 discloses a device in which slot jet nozzles are aligned with a certain inclination of their jet direction against the running direction of the belt to be cleaned and extend essentially over its width.

An improved apparatus for removing liquids from the surface of a belt is in German

Offenlegungsschrift DE 42 15 602 A1 describes. In this device, the jet of gas is blown over a also transverse to the tape running direction across the bandwidth extending slot jet nozzle with a certain angle of inclination against the conveying direction of the belt, wherein the ratio between the width of the slot jet and its distance from the belt is selected such that the gas jet hits the belt at a high speed. At the same time, a suction gap is arranged at a certain distance in the conveying direction of the belt in front of the slit jet nozzle, via which the gas stream and the liquid mixed with it is sucked off the belt.

In the practical use of the known from DE 42 15 602 Al device has been found that can achieve a sufficient cleaning effect with this in the middle of the band. At the same time, however, it was found that where many liquid residues accumulate, the cleaning effect is often insufficient. Practical application has furthermore shown that high flow velocities and large amounts of gas are required to achieve adequate cleaning action. This results in large blower and suction units, high drive power and a high noise level. From DE 694 15 771 T2 a device for the removal of liquid residues from the surface of a moving belt is known, the air nozzles are employed at an angle to the direction of movement of the belt.

Furthermore, WO 2007/085613 A1 discloses a non-generic belt cleaning device for removing contaminants from a moving belt, in which a rotating nozzle beam with a nozzle sprays a water / cleaning agent mixture onto the belt within a hood with a spray chamber. This device is not suitable for removing liquids from the belt surface.

From DE 198 81 989 Tl nozzles for coating thickness control are known in which the air nozzles used are adapted by a cross-sectional change to the desired operating condition.

From DE 22 07 760 B is a generic device for controlling the weight and distribution of a

Metal coating known in which at least two air knives of different width are arranged on a rotatably mounted collecting tube, which can be brought by turning the collecting tube about its axis of rotation optionally transverse to the strip running direction to the effect.

Based on this prior art, the present invention seeks to provide a device of the type mentioned above and a strip processing plant, which improves the cleaning effect and reduces the required gas volumes and the noise level. The solution to the problem is based on the idea that for removing the liquid at least one outlet nozzle extending over only part of the strip width is moved over the strip with a directed gas jet at high speed. The movement of the outlet nozzle (s) preferably takes place substantially transversely to the direction of strip travel. However, movements under other angles other than 0 ° to the strip running direction are also possible, as long as blowing over the entire width of the strip with the nozzle or the nozzles is ensured. Likewise, a movement is possible under continuously changing angles to the tape running direction.

In detail, the object is achieved in a device of the type mentioned above in that the longest extent (L) of the outlet opening of each outlet nozzle is smaller than the width (B) of the tape and that the device means for moving each outlet nozzle at an angle to the direction of the tape wherein the speed of each discharge nozzle is greater than the speed of the belt.

While in the stationary outlet nozzles of the prior art, the blow-off of the liquid is passively and only once at belt speed, in the invention with at least one movable outlet nozzle of the blow-off actively with a multiple of the belt speed. Thus, for example, the belt speed 20 m / s, the speed of the nozzle movement, in particular transversely to the direction of the tape, however, be 100 m / s. The speed of the outlet nozzle (s), which is higher in comparison with the strip speed, is used at least in part to reduce the longest extent (L), in particular the slot length of the slot-shaped outlet opening of the outlet nozzle and thus the amount of gas and noise. If, as in the example mentioned, the speed of the nozzle movement is 100 m / s and the belt speed is 20 m / s, it is possible to reduce the slot length (L) by 5 times to 20% of the bandwidth (B) during a transverse movement of the outlet nozzle. The ratio of the width (B) of the strip to the longest extent (L) of the outlet opening of the outlet nozzle (5) should in any case be greater than B / L = 1.5.

The ratio of nozzle speed to

Tape speed can also be used to a part to reduce the longest extent (L), in particular the slot length of the nozzle, and on the other part for Mehrfachabblasung the surface of the tape. The by the transverse movement of the outlet nozzle (s) to one of the

Band edges already already improved cleaning effect in the lateral areas of the band can be increased by such Mehrfachabblasung again.

As a control means for temporary supply of each outlet nozzle with gas is in particular at least one control slot into consideration. The control means release the gas jet only during a movement of the outlet nozzles running essentially transversely to the running direction of the belt. As a result, the required amount of gas is reduced. The further improves the gas jet impinging substantially transversely to the direction of tape travel the uniformity of the blow-off of the strip surface and thus the surface quality of the strip.

A reduction of the noise with low gas, in particular air consumption, can be achieved by the use of multi-channel flat jet nozzles, the outlet opening is formed by arranged in a row channels. The longest extent (L) of the outlet opening results from the distance between the outer edges of the two outer, the multi-channel flat jet nozzle limiting channels.

Furthermore, the object is achieved by a strip processing system according to the features of claim 20. Advantageous embodiments of the invention will become apparent from the dependent claims and the following description of the figures. Show it:

Figure Ia a first embodiment of a device according to the invention in a schematic

Sectional view with a circulating in a gas storage means of transport,

FIG. 1 b shows a plan view of the belt passing through the device according to FIG. 1 a with a schematic representation of blow-off surfaces;

FIG. 2 a shows a device according to FIG. 1, but with smaller outlet nozzles, Figure 2b is a plan view of that through the device according to

Figure 2a continuous belt with a schematic representation of blowing surfaces,

FIG. 3 shows a second exemplary embodiment of a device according to the invention in a schematic sectional representation with a means of transport circulating around a gas reservoir,

4a shows a third embodiment of a device according to the invention in a schematic sectional view with a nozzle tube having two helical, left-hand nozzle slots and

FIG. 4b shows a device corresponding to FIG. 4a in a schematic sectional representation with a nozzle tube which has a helical, left-handed and a helical, right-handed nozzle slot,

5 developments of the nozzle tube of the devices according to FIGS. 4a and 4b as well as further arrangements of the nozzle slots, FIG.

6 shows a fourth exemplary embodiment of a device according to the invention in a schematic sectional representation with a nozzle tube rotating about a gas storage, FIG.

Figure 7 shows a fifth embodiment of a device according to the invention in one schematic plan view with circular arc movement of the outlet nozzles,

8 shows a rotor of a device according to FIG. 7, but with different control of the air supply, FIG.

FIG. 9a,

FIG. 9b shows schematic sectional views of FIG

An illustration of different inclinations of the outlet nozzle designed as a flat-jet or slit-jet nozzle,

Figure 10 is a schematic sectional view of a

Suction device at the strip edges of a device according to the invention and

Figure 11 shows an alternative embodiment of the nozzle tube of a device according to the embodiments of Figures 4-6.

FIG. 1a shows a first exemplary embodiment of a device (1) for removing liquid from the surface of a belt (3) conveyed in a running direction (2) on a belt processing system (not shown in the figure). Preferably, there are one each

Device (1) on the upper side and a device (1) on the underside of the belt (3), so that the liquid can be removed from both surfaces of the belt simultaneously by blowing off.

The outlet nozzles (5) arranged on a transporting means (4) move along a guideway (6) within one Gas storage (7) transversely to the direction (2) of the band (3). The running as a belt transport (4) runs continuously counterclockwise in the direction of arrow (8). Connected to a gas supply, not shown, container-like gas storage has along a portion of the guide track (6) to the band (3) aligned, over the entire width (B) of the belt (3) extending control slot (9), which the outlet openings (10) of the outlet nozzle (5) and thus the gas from the gas reservoir (7) releases.

The outlet nozzles (5) are in the illustrated embodiment as a slot-shaped passage openings in the band-shaped transport (4), wherein the transport means sealingly covers the control slot (9) and each passage opening along the guide track (6) with the control slot (9) can be brought into overlap is.

The outlet openings (10) of the outlet nozzles (5) are located at such a small distance from the surface of the strip (3) that the impact velocity of the gas jet inflated with each outlet nozzle (5) on the strip (3) is greater than or equal to 100 m / s is. These jet speeds are required to remove rolling oil from a metal strip with air. The gas jet impinging on the belt (3) practically corresponds to the slot shape of the outlet opening (10) with a slot width (S) and a slot length (L).

At the left in the running direction (2) of the band (3) band edge is a symbolized by the arrow (11)

Suction device that the blown from the three outlet nozzles (5) to the band edge rolling oil on both the upper and also sucks under. In the exemplary embodiment, the distance between the three outlet nozzles (5) corresponds to the width of the strip (B), so that the gas jet of one of the three outlet nozzles (5) is always directed onto the surface of the strip (3).

As a means of transport (4) for the outlet nozzles come in addition to the band shown here, for example, flat belt, timing belt, chains or the like into consideration. The deflections, such as pulleys, the

Transport means (4) and its drive are not shown in detail in Figure 1 for clarity.

In the illustrated embodiment, the speed of the means of transport (4) and thus the

Outlet nozzles (5) transversely to the direction (2) of the belt (3) five times the speed of the belt (3) in the direction (2). As a result, when an improved cleaning effect by a multiple blow-off is omitted, the slot length (L) of the outlet nozzles on a

Fifth of the width (B) of the band (3) can be reduced. As a formula, this relationship can be expressed as follows:

L = B x V _B / V _D , where

L = slot length B = width of the belt (3)

V _B = speed of the belt (3)

V _D = velocity of the outlet nozzle (5)

FIG. 1 b shows the blow-off surfaces resulting on the moving surface of the belt (3) in the running direction (2)

Use of the device (1) shown in Figure Ia. As a result of the fivefold speed of the nozzles (5) compared to the speed of the belt (3), despite the considerably smaller than the prior art outlet openings (10) of the outlet nozzles (5), the band (3) over the entire surface with the directed gas jet applied simultaneously lower gas consumption and associated lower noise pollution. The exclusive movement of all outlet nozzles (5) to the left band edge also improves the hitherto problematic cleaning effect in the lateral region of the band (3).

The embodiment of the device (1) according to Figure 2 a corresponds in construction and the operation largely that of Figure 1 a, so that on the local

References. Differences arise insofar as six outlet nozzles (5) are arranged at a distance of half the width (B) of the strip (3) in the band-shaped transport means (4), so that the slot length (L) of the outlet nozzles (5) with respect to FIG Half length can be performed, if no Mehrfachabblasung it is asked for. The blow-off surfaces (12) resulting on the continuous belt (3) can be seen from FIG. 2b.

FIG. 3 shows a second exemplary embodiment of a device (1) according to the invention, which differs from the

Embodiments according to Figures 1 and 2 insofar differs that the transport means (4) not within, but outside of the gas reservoir (7) along its outer guide track (6) is guided. In accordance with the embodiment of Figures 1 and 2, the device (1) along a portion of the guideway (6) to the tape (3) facing control slot (9), the gas from the gas storage (7) to the in the circulating band-shaped transport means (4) arranged outlet nozzles (5) releases. Laterally next to the gas storage

(7) and the left and right belt edge of the belt (3) is in each case arranged a deflection roller (13a, 13b) for the transport means (4), wherein at least one of the deflection rollers (13a, 13b) connected to a rotary drive, not shown in Figure 3 is to move the band-shaped transport (4) continuously in the direction of arrow (8).

The band-shaped transport means (4) sealingly covers the control slot (9), as can be seen in particular from the detailed illustration in FIG. The control slot (9) is bounded laterally by the guide track (6) forming webs (14a, 14 b) on which slide off the lateral edges of the band-shaped transport means (4). Laterally, the guide track (6) formed in this way is bounded by vertical webs (15a, 15b) which at the same time form a lateral guide for the circulating transport means (4). An advantage of the device of Figure 3 is that the Outlet openings (10) of the outlet nozzles (5) can be brought closer to the band (3), so that at the same exit velocity of the gas jet, a higher cleaning performance can be achieved.

FIGS. 4a, 4b, 5 and 6 show exemplary embodiments of the device (1) according to the invention, in which the translatory movement of the nozzles transversely to the running direction of the strip is produced by a screw movement:

The apparatus (1) according to FIGS. 4a, 4b comprises a nozzle tube (18) which can be rotated about its longitudinal axis (17) by means of a drive (16), into which two helical nozzle slots (19a, 19b) are introduced. The closed at the front ends executed nozzle tube is supplied via the there fitting, a passage having pins (20a, 20b) with gas, in particular air, and also serves as a gas storage. The nozzle tube (18) is to form a narrow annular gap (21) in a hollow cylinder of a housing (22) facing one to the band (3)

Control slot (9) rotatably mounted, which releases the helical nozzle slots (19a, 19b) of the nozzle tube (18) only in the region of the control slot (9) towards the band. As a result of the rotation of the nozzle tube (18) move the released portions of the nozzle slots (19a, 19b) along the control slot (9) transversely to the direction (2) of the belt. The outlet nozzles (5) are formed by the cooperation of the helical nozzle slots (19a, 19b) with the control slot (9), wherein the longitudinal edges of the control slot (9) and the longitudinal edges of the nozzle slots (19a, 19b), the two slit-shaped outlet nozzles (5). limit. The slit length (L) of the thus formed Outlet nozzles (5) is determined by the distance of the longitudinal edges of the control slot (9) and the slot width (S) by the distance of the longitudinal edges of the nozzle slots (19a, 19b).

The two nozzle slots (19a, 19b) in the nozzle tube (18) of Figure 4a have a distance corresponding to half the width (B) of the band (3) and have a matching pitch angle. Upon rotation of the nozzle tube (18), both outlet nozzles (5) move in the same direction transversely to the running direction (2) of the strip (3).

The two nozzle slots (19a, 19b) in the nozzle tube (18) of Figure 4b have opposite pitch angle with right-handed or left-handed helix. The

Outlet nozzles (5) move from the center of the belt (3) in opposite directions to the belt edges, which gives an improved cleaning effect, especially in the area of both belt edges.

Figure 5 illustrates the development of the nozzle tube (18) for various arrangements of nozzle slots (19a, 19b). The unwinds A1 and A2 show the nozzle tubes (18) in FIGS. 4a and 4b with rectified or opposite movement of the outlet nozzles (5). The development A3 shows a nozzle tube according to Figure 4b, in which the nozzle slots (19a, 19b) but in the circumferential direction U of the nozzle tube (18) are arranged offset to one another. The staggered arrangement allows an overlap of the two nozzle slots (19a, 19b) and a more stable design of the nozzle tube (18). The pitch of the nozzle slots (19a, 19b) of the nozzle tubes (18) corresponding to the unwinds A1 to A3 is set equal to the bandwidth, so that each outlet nozzle during a revolution of the nozzle tube (18) once over the entire width (B) of the band (18) 3) moves.

In the arrangement of the nozzle slots corresponding to the unwinds Bl to B3 of Figure 5, the pitch of each nozzle slot is only equal to half the width (B) of the tape (3). This has lower speeds of

Outlet nozzles (5) result. In order to move the outlet nozzles (5) over the entire width (B) of the band (3), two turns of the nozzle tube (18) are required in the arrangements after the unwinds Bl to B3.

The slope of the nozzle slots (19a, 19b) of the nozzle tubes (18) corresponding to the unwinds Cl to C3 is equal to twice the bandwidth selected, so that each outlet nozzle already during half a revolution of the nozzle tube (18) once across the entire width (B) of the band (3) moves. If the pitch of the nozzle slots (19a, 19b), as shown in the windings Cl to C3, selected as an integer multiple of the width (B) of the band (3), therefore, lower speeds result for the nozzle tube

If the pitch of the nozzle slots (19a, 19b), as shown in all developments of Figure 5, as an integer fraction or as integral multiple of the width (B) of the band (3), so is always the same number of outlet nozzles (5) effective and as a result, the outflowing gas, in particular air, always constant. FIG. 6 shows a preferred exemplary embodiment of a device (1) according to the invention with a rotating nozzle tube (18), which, however, unlike the embodiment according to FIG. 4, does not simultaneously serve as a gas reservoir (7). Around

To achieve separation of functions and at the same time to reduce the distance between the nozzle tube (18) and the band (3), surrounding the nozzle tube (18) forming an annular gap (21) a hollow cylindrical gas reservoir (23) with a control slot facing the band (3) (9), which extends over the entire width (B) of the band (3). According to FIG. 5, the nozzle slots (19a, 19b) are introduced into the jacket (24) of the nozzle tube (18) with an inclination in the direction of movement. The hollow cylindrical gas reservoir (23) is held on the front side, at the same time serving as a gas passage pins (25a, 25b) arranged laterally next to the belt supports (26a, 26b). The pins (25a, 25b) also serve as a receptacle for the pivot bearing (27) of the stationary gas reservoir (23) rotating nozzle tube (18). At least one of the

End faces, the nozzle tube (18) is connected to a drive (28), for example, a pulley of a belt drive.

Furthermore, it can be seen from FIG. 6 that a collar (29) of the nozzle tube (18) projects beyond the band edges laterally in order to maintain the necessary stability of the nozzle tube despite the nozzle slots (19a, 19a) extending over the entire width of the band (3) , 19b). In addition, to stabilize the nozzle tube (18), the nozzle slots (19a, 19b) bridging, only over short Sections extending webs may be provided which do not significantly affect the gas outlet.

Due to the opposite movement of the outlet nozzles (5), the liquid to be removed is blown off to both band edges and sucked there by the exhaust devices (11) shown only schematically by arrows. Of course, it is within the scope of the invention to provide the device (1) according to Figure 6 with differently arranged nozzle slots (19a, 19b). In that regard, reference is made to the comments and explanations to Figure 5.

FIG. 11 shows a deviating embodiment of a nozzle tube (18) for a device according to FIGS. 4 to 6. The nozzle tube (18) has a plurality of nozzle openings (5) arranged on at least one helical line, the line (s) following the course of the nozzle slots (19 a, 19 b). The control slot (9) extends at an angle to each helical line on which the nozzle openings (5) are arranged, and releases the gas. The nozzle openings

(5) are preferably inclined towards the strip edges and opposite to the strip running direction (2). Due to the inclination to the strip edges required for the removal of the liquid crossflow is supported. The inclination opposite to the tape running direction (2) provides for the counterpulse for

Slowing down the liquid moving at belt speed.

FIG. 7 shows a further embodiment of the device (1) according to the invention, which has at least one holders (30), rotatable in the exemplary embodiment, by means of a drive (not shown) about a rotation axis (31) perpendicular to the surface of the belt (3) Distance from the respective axis of rotation (31) slit-shaped outlet nozzles (5) are arranged. In the illustrated Embodiment consists of each holder (30) of four simultaneously serving as a gas supply holding arms (32), which are each arranged at a distance of 90 ° about the axis of rotation (31) around. The gas flow from the outlet nozzles (5) is released in each case only on a circular arc of the circular path (34) of each outlet nozzle (5) by means of a control slot (33). The four slots (30) associated control slots (33) are arranged in matching sectors of the circular paths (34) and each extend to the intersections of adjacent circular paths (34) on which the outlet nozzles (5) rotate. An admission of the band (3) with gas is therefore ensured over its entire width (B). Extend the control slots (33) over a circular sector of more than 120 °, the desired uniform application of gas to the surface of the belt (3) is no longer guaranteed. In addition, gas consumption increases disproportionately with larger sector angles. As far as the maximum circular sector of 120 ° is not exceeded, the effective, that is released from the control slot (33) outlet nozzles move substantially transversely to the direction of tape travel.

The drives of all brackets (30) are synchronized with each other to ensure proper engagement of the support arms (32) of adjacent brackets (30).

In the embodiment of Figure 7, the control slots (33) downstream of the outlet nozzles (5). The control slots (33) can be constructively introduced, for example, in a plate between the rotating outlet nozzles (5) and the band (3), which at the same time the gas flow on the rest Part of the circular path (34) prevented by building up a dynamic pressure. In another embodiment of the device according to the invention according to FIG. 7, the control slots (33) can be displaced in the region of the supply of the gas to the retaining arms (32), as illustrated in FIG. This makes it possible to supply the gas to save space in the center of the rotating holder (30).

If the outlet nozzle (5) is arranged perpendicular to the surface of the strip (3), a collision jet of the gas is formed, which generates a tangential flow on the surface of the strip (3). The tangential flow is divided at high flow velocities into a partial flow in the direction of movement (8) and a partial flow counter to the direction of movement (8) of the outlet nozzle (5).

If the nozzle gap of the outlet nozzle is not arranged perpendicularly to the surface of the strip (3) but inclined in the direction of movement according to FIG. 9a or inclined perpendicular to the direction of movement according to FIG. 9b, then, with sufficient inclination, a flow occurs exclusively either in or against the direction of movement Outlet nozzle (5). The inclination of the nozzle gap in the direction of movement (8) according to FIG. 9a causes the blow-off of the liquid to be divided into damming and subsequent removal. If, however, a damming of the liquid can be avoided, the inclination of the nozzle gap against the direction of movement (8) is recommended, as shown in FIG. 9b. The angle of inclination to

Surface of the tape in or against the direction of movement is 30 ° - 90 °, in particular 45 ° - 80 °. By the inventive movement of the outlet nozzles in particular transversely or at an angle to the direction

(2) of the belt (3), which compared to the speed of the belt higher speed of the outlet nozzles and the

Provide several at the same time on the surface of the tape

(3) effective outlet nozzles (5), the inventive device (1) can be carried out with standard flat jet nozzles.

A reduction of the noise with low gas, in particular air consumption, can be achieved by the use of multi-channel flat jet nozzles, the outlet opening is formed by arranged in a row channels.

The multi-channel flat jet nozzles can in particular also be fastened to the transporting means (4), which have a low air consumption and a significantly reduced sound level with high blowing power. This further reduces the noise level already reduced by the reduced gas volumes.

Finally, FIG. 10 shows a suction device (11) with which the gas blown onto the strip (3) and mixed with the liquid is sucked off at the strip edges of the strip (3) at the level of the outlet nozzles (5). LIST OF REFERENCE NUMBERS

Claims

claims

Anspruch [en] A device for removing liquid from the surface of a belt conveyed in a running direction from a belt processing installation by means of a gas jet directed onto the moving belt, with at least one outlet nozzle having a

Outlet opening from which the gas jet emerges, characterized in that the longest extent (L) of the outlet opening (10) of each outlet nozzle (5) is smaller than the width (B) of the band (3) and that the device (1) comprises means for Moving each discharge nozzle (5) at an angle to the running direction (2) of the strip (3), wherein the speed of each discharge nozzle (5) is greater than the speed of the strip (3).

2. Apparatus according to claim 1, characterized in that the outlet opening (10) has the shape of a slot having a slot width (S) and a slot length (L).

3. Apparatus according to claim 1 or 2, characterized in that the ratio of width (B) of the tape to the longest extent (L) of the outlet opening of the outlet nozzle (5) is greater than B / L = 1.5.

4. Device according to one or more of claims 1 to 3, characterized in that the speed of the outlet nozzle (5) is greater by a multiple than the speed of the belt (3).

5. Device according to one or more of claims 1 to 4, characterized in that each outlet nozzle (5) is arranged on a transport means (4) along a guide track (6) of a gas reservoir (7) for supplying the outlet nozzles (5) Gas is circulating.

6. The device according to claim 5, characterized in that the gas reservoir (7) along a portion of the guide track (6) has a band (3) facing control slot (9) which releases the gas from the gas reservoir (7).

7. Apparatus according to claim 5 or 6, characterized in that the transport means (4) as a band and each outlet nozzle (5) is designed as a passage opening in the band (4), the band (4) sealingly covers the control slot (9) and Each passage opening along the guide track (6) with the control slot (9) can be brought into overlap.

8. Device according to one of claims 5 to 7, characterized in that the guide track (6) within the gas reservoir (7) is arranged.

9. Device according to one of claims 5 to 7, characterized in that the guide track (6) outside of the gas reservoir (7) is arranged.

10. Device according to one of claims 1 to 4, characterized in that the means for moving each outlet nozzle (5) by means of a drive (28) about its longitudinal axis (17) rotatable nozzle tube (18) comprising at least one helical nozzle slot ( 19a, 19b) or more arranged on at least one helical line nozzle openings.

11. The device according to claim 10, characterized in that the nozzle tube (18) to form an annular gap

(21) is arranged in a hollow cylindrical housing (22) with a control slot (9) pointing to the belt (3), which angle at each nozzle slot (19a, 19b) of the

Nozzle tube (18) or each helical line on which the nozzle openings are arranged, extends and releases the gas from the same time serving as a gas storage nozzle tube (18).

12. The apparatus according to claim 10, characterized in that the nozzle tube (18) to form an annular gap (21) a hollow cylindrical gas reservoir (23) with a band (3) facing control slot (9) surrounds the angle to each nozzle slot (19 a , 19b) of the nozzle tube (18) or each helical line, on which the nozzle openings are arranged, extends and releases the gas from the gas reservoir (18).

13. Device according to one of claims 10 to 12, characterized in that the nozzle tube (18) at least one helical left-hand and at least one helical right-hand nozzle slot (19a, 19b) or more on at least one helical left-hand and several arranged on at least one helical right-hand line nozzle openings.

14. Device according to one of claims 1 to 4, characterized in that the means for moving each outlet nozzle (5) comprises at least one by means of a drive about a surface of the belt (3) vertical axis (31) rotatable support (30), at the distance from the axis of rotation (31) at least one outlet nozzle (5) is arranged.

15. The apparatus according to claim 14, characterized in that each nozzle (5) control means (33) are associated with the release of the gas.

16. The apparatus according to claim 15, characterized in that the control means is a control slot (33) which temporarily with the outlet opening (10) of each outlet nozzle (5) can be brought into overlap.

17. The apparatus according to claim 15, characterized in that the control means in the region of the axis of rotation (31) of the holder (30) arranged control slot (33) which temporarily produces a gas-conducting connection (32) to each outlet nozzle (5).

18. Device according to one of claims 1 to 17, characterized in that the gas jet of single or multiple outlet nozzles (5) with an inclination of 30 ° to 90 ° in or against the direction of movement (8) on the surface of the belt (3) is directed.

19. Device according to one of claims 4 - 6, 8, 9 and 14 - 18, characterized in that each outlet nozzle is a multi-channel flat jet nozzle.

20. strip processing plant with a device according to one or more of claims 1 to 19.

21. strip processing system according to claim 20, characterized in that in each case a device (1) is arranged both on the lower and upper side of the strip (3).