Method and machine for metal strip heating

FIELD: process engineering.

SUBSTANCE: invention relates to device metal strip heating in direct-fired furnace. Device for induction preheating of metal strip is arranged ahead of direct-fired furnace in direction of metal strip feed. Air feed means are located ahead of aforesaid device for airing said strip.

EFFECT: higher quality and yield of finished products.

19 cl, 1 dwg

 

The invention relates to a device for heating a metal strip in a convection oven, in particular, with the purpose of drying applied before the metal strip coating. In addition, the invention relates to a method for heating a metal strip.

For various industrial applications, in particular, aluminum and ferrous metallurgy, there is a need for coating on metal strip material protective or decorative coating and drying in a high throughput installation and efficient use of energy while performing the relevant regulations for the protection of the environment. For drying are used in accordance with the standards of the various alternative technologies, for example, drying in convection ovens, drying in a stream of air or drying by using electromagnetic induction. Description drying using electromagnetic induction is shown, for example, in EP 0744222 B1 or FR 2832940.

Complete installations for coating and drying a metal strip material are performed separately for a given party applying the maximum throughput cannot be arbitrarily increased without compromising the quality of treatment. If, however, it is desirable to improve throughput, substantial further the investment, in particular, in the area of drying ovens (lengthening ways in a convection oven), with a corresponding increase in the speed of the strip to provide the remaining constant quality material.

On this basis, the basis of the invention is a device for heating a metal strip in a convection oven, in particular, with the purpose of drying applied before the metal strip coating that provides reliable heating material and a flexible agreement with the specified capacity.

The problem is solved, according to the invention, with the device in accordance with the generic concept of paragraph 1 of the claims that in the conveying direction of the metal strip before the convection oven is a device for inductive heating of the metal strip.

Through the use of additional devices for inductive preheating the metal strips at a given furnace to further increase the bandwidth, for which the convection oven ("booster" principle), without large additional investments. Inductive heating device has a relatively compact design and thus can be easily integrated into the installation when there is existing spatial conditions. For example, a device for inductive preheating when using a convection oven for drying printed on the metal strip coating can be integrated without the high cost of land deals between the coating device and the casing of the furnace.

Orientation to be heated, respectively, drying the metal strip inside the convection oven or a device for the inductive preheating in principle not limited. Expediently, the metal strip is passed through the device for the inductive preheating, and through the adjacent convection oven horizontally. However, it is also possible deviation of the strip between the device for inductive preheating and convection oven.

Device for the inductive pre-heating a metal strip preferably contains at least one induction coil, while the induction coil surrounds a segment of the tunnel, through which is passed a metal band. This ensures a spatial separation between the subject of heat, respectively, drying the metal strip and the induction coil so that, on the one hand, eliminates the danger of mutual mechanical damage and, on the other hand, in case the evaporation from the surface of the strip solvent means applied before coating preventing contamination of the induction coil. It is clear that the tunneling segment that surrounds the strip in the zone of at least induction coil shall be magnetically permeable. For this purpose it is preferably made of plastic. Induction coil, in turn, preferably is water-cooled.

In another preferred embodiment, the invention provides that in the conveying direction of the metal strip before a device for inductive preheating are means for air intake. By using allow air tools strip is blown by the air stream, which, after contact with the surface of the strip preferably runs parallel to the strip through the device for the inductive pre-heating a metal strip. This has the advantage that due to the air flow allows for more cooling unit components for the preferred heat. At the same time, oriented parallel to the direction of passage of the strip air flow has a protective function, so that the air cannot leave a convection oven is opposite to the direction of passage of the strip and thereby to heat the device for the inductive preheating, respectively, to enter in front of his unit for applying ocrite. As the air flow is preferably selected flow of outdoor air to room temperature 20 to 40°C.

It is clear that instead of air can also be used with other suitable gases, such as nitrogen.

Filled with air tools can be made different. Preferably, these are located on both sides of the surface metal strips of nozzle boxes and made, for example, stainless steel. In accordance with another idea of the invention, nozzle boxes include a wedge-shaped tapering in the direction of transporting the metal strip coolant space, which goes into a tunnel segment of the device for the inductive pre-heating a metal strip. Due to this wedge-shaped coolant space, cooling air flow is introduced with a relative high speed tunnel segment.

According to another preferred variant implementation of the invention, the tunneling segment passes into the connecting tunnel segment with convection oven tunnel area. This tunnel section preferably is provided an exhaust unit.

It is used to suction passing through the tunnel segment parallel to the direction of passage of the strip gas flow, so that it cannot enter convection the Yu oven and lower her temperature level.

In addition, the basis of the invention is to provide a method of heating a metal strip, in particular, with the purpose of drying applied before the metal strip coating, which has a high degree of flexibility and efficiency of energy use.

The problem is solved, according to the invention, by using a method in accordance with the restrictive part of paragraph 13 of the claims that the metal strip is first pre-heated in the device for the inductive pre-heating a metal strip, and then heated further in a convection oven.

The method according to the invention has, accordingly, the above advantages. In particular, the method is used for drying applied to the block for coating metal strip protective or decorative coating. Due to the fact that the metal strip preferably before entry into the device for the inductive pre-heating blown air, in particular, outside air, which then runs parallel to the metal strip through the device for the inductive preheating is used, on the one hand, the cooling effect of the air flow device for the inductive pre-heating a metal strip, frequent in the spine, for under it inductor coil, on the other hand, prevents the hot gases from the convection oven is opposite to the direction of passage of the strip.

In the case of drying printed on the metal strip coating, it is preferably transported from the device for applying the coating to a convection oven in a closed tunnel system. This ensures the prevention of free exit is contained in the covering fraction of solvent in the environment and feed them to resolve without damage to the environment, respectively, for subsequent burning.

Below is a more detailed explanation of the invention on the basis of the exemplary embodiment with reference to the accompanying drawing. The sole figure shows a device according to the invention, for drying coating on steel strip cover.

The device comprises, when viewed in the conveying direction of the steel strip 1 unit 2 for applying a band of coating roller causing mechanism 2 for coating steel strip 1 solvent coating. In addition, the device contains a convection oven 3 for drying printed in dealing coating the coating unit. According to the invention, in the conveying direction of the steel strip 1 before convection oven 3 is the device 4 deinduction pre-heating of the steel strip 1. It is performed in this case in the form of an induction coil 4, which surrounds the tunnel segment 8, through which is directed the steel strip 1. Tunnel segment is made in this case of plastic material, due to which there are no obstacles to the penetration of the magnetic field in the tunnel segment 8.

As shown in the figure, the steel strip 1 is routed between unit 2 for applying a band of coating oven and a convection oven 3 in a closed tunnel system 5. It contains, when viewed in the conveying direction of the steel strip 1 adjacent to the output unit 2 for applying a band of coating tunnel section 6, which in turn enters the wedge-shaped tapering coolant space 7. Coolant space 7 is limited on both sides located on either side of the surfaces of the steel strip 1 deployme boxes 7a, through which the flow of external air can enter the tunnel system 5, as will be explained in more detail below. To the blasting space 7 surrounded by adjacent induction coil 4 tunnel segment 8, which, in turn, becomes located immediately before convection oven 3 tunnel section 9. In the tunnel section 9 provides an exhaust unit 10, which sucks again blown through the nozzle boxes 7a tunnel system 5 with what omashu fan 7b of the flow of external air.

The principle of operation of the above device is as follows:

Subject to coating steel strip is introduced not specified in detail, with the strip speed is typically 60-200 m/min unit 2 for applying a band of coating and coated there with roller causing mechanism 2A solvent coating. After the rejection on guide roller 2b, the steel strip 1 is directed in the horizontal plane and enters after leaving the unit 2 for applying a band of coating in a closed tunnel system 5. After passing the tunnel section 6, the steel strip 1 is transported through a wedge-shaped tapering coolant space 7. There she blows coming out of nozzle boxes 7a flow of outdoor air to a room temperature of about 20-40°C.

Then, the steel strip 1 is surrounded by the induction coil 4 tunnel segment 8, where it is preheated from ambient temperature to a temperature of about 80-110°C. Flow L outside air runs parallel to the steel strip 1 through the tunnel segment 8 and takes with preferably heated strip having a low boiling fraction of the solvent, such as, for example, ketones or alcohols, which during the pre-heat is transferred into the vapor phase. Then, the steel strip 1 and the L flow of outdoor air is and come out of the tunnel segment 8 in the connecting tunnel segment 8 with convection oven 3 tunnel section 9, where L flow of external air is again sucked by means of the exhaust unit 10 and served for not harmful to the environment processing, respectively, subsequent burning.

Then, the steel strip 1 is included in a convection oven 3, where she with the help supplied by a blower 3A hot air with a temperature of 400-750°C is heated to a temperature 120-240°C, while also having a high boiling temperature (approximately 150°C) the proportion of the solvent is transferred into the vapor phase and deposited on the steel strip 1 floor completely dry. In a convection oven 3 is supported by a lower relative to the tunnel system 5 pressure (pressure difference of about 20 PA), which further prevents the release of air from the convection oven.

1. Device for heating a metal strip (1) in a convection oven (3), in particular for drying applied before the metal strip (1) covering, in the conveying direction of the metal strip (1) before convection oven (3) has a device for inductive pre-heating a metal strip (1), characterized in that in the conveying direction of the metal strip (1) before the device (4) for the inductive preheating are means (7a) air intake for cooling a metal strip outer is m the air.

2. The device according to claim 1, characterized in that the device for the inductive heating contains at least one induction coil (4), while induction coil surrounds the segment (8) of the tunnel through which is passed a metal strip (1).

3. The device according to claim 2, characterized in that tunnel segment (8) is made of plastic.

4. The device according to claim 1, characterized in that the means of the air intake is made in the form located on both sides of the surface metal strips of nozzle boxes (7a).

5. The device according to claim 2, characterized in that the means of the air intake is made in the form located on both sides of the surface metal strips of nozzle boxes (7a).

6. The device according to claim 2, characterized in that the nozzle boxes (7a) include wedge-shaped tapering in the direction of transporting the metal strip (1) coolant space (7), which becomes surrounded by at least one induction coil (4) tunnel segment (8).

7. The device according to claim 4, characterized in that the nozzle boxes (7a) include wedge-shaped tapering in the direction of transporting the metal strip (1) coolant space (7), which becomes surrounded by at least one induction coil (4) tunnel segment (8).

8. The device according to claim 5, characterized in that the nozzle boxes (7a) in luchot wedge tapering in the direction of transporting the metal strip (1) coolant space (7), which becomes surrounded by at least one induction coil (4) tunnel segment (8).

9. The device according to claim 2, characterized in that tunnel segment (8) passes into the connecting tunnel segment (8) with convection oven (3) tunnel section (9).

10. The device according to claim 6, characterized in that tunnel segment (8) passes into the connecting tunnel segment (8) with convection oven (3) tunnel section (9).

11. The device according to claim 6, characterized in that tunnel section (9) provides an exhaust unit (10).

12. Device according to any one of claims 1 to 11, characterized in that the device comprises situated in the conveying direction of the metal strip (1) in front of the unit (2) for applying a band of coating.

13. The device according to claim 8, characterized in that the metal strip (1) is communicated between the block (2) for applying a band of coating oven and a convection oven (3) in a closed tunnel system (5).

14. The method of heating a metal strip (1), in particular for drying applied before the metal strip (1) coating, while the metal strip (1) is first pre-heated in the device (4) for the inductive pre-heating a metal strip (1), and then heated further in a convection oven (3), characterized in that the metal strip (1) before the input is ω device (4) for the inductive preheating fanned by the external air.

15. The method according to 14, characterized in that the metal strip (1) prior to heating supply coverage in the block (2) for coating.

16. The method according to 14, characterized in that the metal strip (1) is transported from the unit (2) for applying the coating to a convection oven (3) in a closed tunnel system (5).

17. The method according to item 15, wherein the metal strip (1) is transported from the unit (2) for applying the coating to a convection oven (3) in a closed tunnel system (5).

18. The method according to any of PP-17, characterized in that the airflow is parallel to the metal strip (1) through the device (4) for the inductive preheating.

19. The method according to p, characterized in that the air is sucked off before convection oven (3).



 

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