A protective device for preventing strip steel from scratching the bellows in a drying furnace

Abstract

A protective device for preventing a steel strip from scratching a bellows in a drying furnace belongs to the field of cold rolling heat treatment technology. Coating roller, steel strip, protector device 1, bellows bracket, upper bellows, protector device 2, gasket, protector device 1 hanger 1, steel pipe 1, protector device 1 hanger 2, steel pipe 2, protector device bracket, bolts, nuts, washers, protector device 2 base 1, protector device 2 base 2, protector device 2 hanger 1, protector device 2 hanger 2, steel pipe 3, No. 5 upper bellows, bottom plate 1, support plate 1, round steel 1, bottom plate 2, support plate 2 and round steel 2. The round steel is welded in the groove of the support plate for installing a protective tube 20. When the steel strip is about to scratch the bellows, the steel strip first scratches the protective tube of the protector device to avoid damage to the quality of the steel strip and the coating caused by the steel strip scratching the bellows. The advantages are simple and practical structure, convenient and reliable operation.

Description

Technical Field

[0001] The present invention belongs to the field of cold rolling heat treatment technology, and particularly relates to a protective device for preventing strip steel from scratching a bellows in a drying furnace. The main function is to prevent the strip steel from scratching a bellows in a coating drying furnace when the tension of the strip steel changes, thereby damaging the coating quality and the strip steel quality. Background Art

[0002] There are two main types of coating drying furnaces at present. One is the type that uses radiation tubes and open flames to radiate and heat the strip and coating, and the other is the type that uses circulating bellows to convectively heat the strip and coating. The former uses furnace rollers to transfer the strip, and the coating is easy to adhere to the surface of the furnace rollers to form nodules, and it is very easy to cause scratches on the coating, which seriously affects the coating quality. The latter uses floaters to convey the strip. There is no roller in the furnace. The strip is always in a suspended or floating state. The coating quality is high and its application is becoming more and more extensive. When the latter is used to heat the strip, a circulating bellows is used in the drying section to heat the strip. The strip is supported by the coating roller at the front end and the floater at the rear end. The strip is maintained in a suspended state in the middle. When the tension of the strip changes, the strip is easy to scratch the bellows, which damages the quality of the strip and the coating. Summary of the invention

[0003] The purpose of the present invention is to provide a protective device for preventing the strip steel from scratching the bellows in the drying furnace, solving the problem of the strip steel and the bellows scratching caused by the change of tension or other reasons in the coating drying furnace. The method is simple in structure, practical, easy to operate and reliable.

[0004] The present invention comprises: a coating roller 1, a strip steel 2, a protector device 1 3, a bellows bracket 4, an upper bellows 5, a protector device 2 6, a gasket 7, a protector device 1 hanger 1 8, a steel pipe 1 9, a protector device 1 hanger 2 10, a steel pipe 2 11, a protector device bracket 12, bolts 13, nuts 14, washers 15, a protector device 2 base 1 16, a protector device 2 base 2 17, a protector device 2 hanger 1 18, a protector device 2 hanger 2 19, a steel pipe 3 20, a No. 5 upper bellows 21, a bottom plate 1 22, a support plate 1 23, a round steel 1 24, a bottom plate 2 25, a support plate 2 26 and a round steel 2 27.

[0005] The upper bellows 5 is arranged in the drying furnace along the trajectory of the strip suspension curve and is roughly parallel to it. According to the running direction of the strip, the upper bellows 5 is composed of five bellows. A set of protector device 3 is arranged in front of each bellows of the upper bellows 5. The height of the protector device 3 is determined according to the lowest point of the corresponding bellows. A set of protector device 2 6 is arranged behind the No. 5 upper bellows 21 to prevent the strip from scratching the bellows.

[0006] The protector device first bracket 12 is welded to the bellows bracket 4 to form a hanger in the width direction of the drying furnace, which is used to support or install the protector device first hanger 8 and the protector device first hanger 2 10.

[0007] Protector device one hanger one 8 and protector device one hanger two 10 are installed on the protector device bracket 12 through bolts 13 and nuts 14, and are used for the installation of steel pipe one 9 and steel pipe two 11.

[0008] When the protector device one hanger 8 and the protector device one hanger 2 10 are installed, the height of the hanger is adjusted by the gasket group 7 to ensure the horizontality requirement of the steel pipe 1 9 and the steel pipe 2 11.

[0009] Protector device one hanger one 8 and protector device one hanger two 10 are both composed of a bottom plate one 22, a support plate one 23 and a round steel one 24. The support plate one 23 is vertically welded on the bottom plate one 22, a semicircular groove is opened on the support plate one 23, the diameter of the round steel is φ25, and the round steel one 24 is welded in the groove of the support plate one 23, which is used to connect the steel pipe one 9 and the steel pipe two 11.

[0010] The steel pipe 1 9 and the steel pipe 2 11 are φ34×3.2, and the length can be adjusted according to the strip width and the hanger position.

[0011] The protector device second base 16 and the protector device second base 2 17 are welded on the outer wall of the No. 5 upper wind box 21, and the protector device second base 16 and the protector device second base 2 17 are symmetrically arranged along the center line of the unit.

[0012] The protector device 2 hanger 18 and the protector device 2 hanger 2 19 are respectively installed on the protector device 2 base 16 and the protector device 2 base 2 17 by bolts and nuts. The protector device 2 hanger 18 and the protector device 2 hanger 2 19 are composed of the bottom plate 25, the support plate 26 and the round steel 27. The support plate 26 is vertically welded to the bottom plate 25, and a semicircular groove is opened on the support plate 26. The round steel 27 is welded in the groove of the support plate 26. The diameter of the round steel is φ48, which is used to install the steel pipe 3 20.

[0013] The steel pipe three tubes 20 are φ60×3.9, and the length can be adjusted according to the strip width and the hanger position.

[0014] The protector device works in the high temperature environment of the furnace for a long time and is made of 06Cr25Ni20 heat-resistant steel or materials matching the furnace temperature.

[0015] The bottom elevations of the steel pipe 1 9 , the steel pipe 2 11 and the steel pipe 3 20 are 10-20 mm lower than the lowest point of the bellows closest thereto.

[0016] The round steel is welded in the groove of the support plate for installing the protection tube 20. When the strip steel is about to scrape the bellows, the strip steel first scrapes against the protection tube of the protector device to avoid damage to the strip steel and coating quality caused by the strip steel scraping the bellows.

[0017] The present invention provides a method for preventing a steel strip from scratching a bellows in a drying furnace, comprising the following steps:

[0018] 1) After the strip steel 2 has been coated with the insulating coating by the coating roller 1, it enters the drying furnace for heating. In the drying section, the strip steel is heated by a bellows, which is arranged parallel to the strip steel hanging curve;

[0019] 2) In the drying section, the strip steel is suspended and runs under a certain tension; when the strip steel tension increases, the strip steel tends to be tensioned in the furnace, and its suspension curve approaches the upper bellows;

[0020] 3) In order to prevent the strip from scratching the lower edge of the upper bellows, a protector device 1 3 and a protector device 2 36 are arranged between the bellows; when the strip is about to scratch the bellows, the strip first scratches the protection tube of the protector device to avoid damage to the strip and coating quality caused by the strip scratching the bellows.

[0021] The invention has the advantages of simple structure, practicality, convenient operation and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Layout diagram of the protector device to prevent the strip steel from scratching the bellows.

[0023] Figure 2 A cross-sectional view of a protector device for preventing the strip steel from scratching the bellows.

[0024] Figure 3 A cross-sectional view of the second protector device for preventing the strip steel from scratching the bellows.

[0025] In the figure: coating roller 1, strip steel 2, protector device 1, bellows bracket 4, upper bellows 5, protector device 2, gasket 7, protector device 1 hanger 1 8, steel pipe 1 9, protector device 1 hanger 2 10, steel pipe 2 11, protector device bracket 12, bolts 13, nuts 14, washers 15, protector device 2 base 1 16, protector device 2 base 2 17, protector device 2 hanger 1 18, protector device 2 hanger 2 19, steel pipe 3 20, No. 5 upper bellows 21, bottom plate 1 22, support plate 1 23, round steel 1 24, bottom plate 2 25, support plate 2 26 and round steel 2 27. DETAILED DESCRIPTION

[0026] Figure 1 — Figure 3 This is a specific implementation of the present invention.

[0027] A protection method for preventing a strip steel from scratching a bellows in a drying furnace, comprising: a coating roller 1, a strip steel 2, a protector device 1 3, a bellows bracket 4, an upper bellows 5, a protector device 2 6, a gasket 7, a protector device 1 hanger 1 8, a steel pipe 1 9, a protector device 1 hanger 2 10, a steel pipe 2 11, a protector device bracket 12, bolts 13, nuts 14, washers 15, a protector device 2 base 1 16, a protector device 2 base 2 17, a protector device 2 hanger 1 18, a protector device 2 hanger 2 19, a steel pipe 3 20, a No. 5 upper bellows 21, a bottom plate 1 22, a support plate 1 23, a round steel 1 24, a bottom plate 25, a support plate 2 26 and a round steel 2 27.

[0028] The upper bellows 5 is arranged in the drying furnace along the trajectory of the strip suspension curve and is roughly parallel to it. According to the running direction of the strip, the upper bellows 5 is composed of five bellows. A set of protector device 3 is arranged in front of each bellows of the upper bellows 5. The height of the protector device 3 is determined according to the lowest point of the corresponding bellows. A set of protector device 2 6 is arranged behind the No. 5 upper bellows 21 to prevent the strip from scratching the bellows.

[0029] A protector device bracket 12 is welded to the bellows bracket 4 to form a hanger in the width direction of the drying furnace for supporting or installing the protector device hangers 8 and 10.

[0030] Protector device one hanger one 8 and protector device one hanger two 10 are installed on the protector device bracket 12 through bolts 13 and nuts 14, and are used for the installation of steel pipe one 9 and steel pipe two 11.

[0031] When the protector device one hanger 8 and the protector device one hanger 2 10 are installed, the height of the hanger is adjusted by the gasket group 7 to ensure the horizontality requirement of the steel pipe 1 9 and the steel pipe 2 11.

[0032] Protector device one hanger one 8 and protector device one hanger two 10 are both composed of a bottom plate one 22, a support plate one 23 and a round steel one 24. The support plate one 23 is vertically welded on the bottom plate one 22, a semicircular groove is opened on the support plate one 23, the diameter of the round steel is φ25, and the round steel one 24 is welded in the groove of the support plate one 23, which is used to connect the steel pipe one 9 and the steel pipe two 11.

[0033] The steel pipe 1 9 and the steel pipe 2 11 are φ34×3.2, and the length can be adjusted according to the strip width and the hanger position.

[0034] The protector device second base 16 and the protector device second base 2 17 are welded on the outer wall of the No. 5 upper wind box 21, and the protector device second base 16 and the protector device second base 2 17 are symmetrically arranged along the center line of the unit.

[0035] The protector device 2 hanger 18 and the protector device 2 hanger 2 19 are respectively installed on the protector device 2 base 16 and the protector device 2 base 2 17 by bolts and nuts. The protector device 2 hanger 18 and the protector device 2 hanger 2 19 are composed of the bottom plate 25, the support plate 26 and the round steel 27. The support plate 26 is vertically welded to the bottom plate 25, and a semicircular groove is opened on the support plate 26. The round steel 27 is welded in the groove of the support plate 26. The diameter of the round steel is φ48, which is used to install the steel pipe 3 20.

[0036] The steel pipe three tubes 20 are φ60×3.9, and the length can be adjusted according to the strip width and the hanger position.

[0037] The protector device works in the high temperature environment of the furnace for a long time and is made of 06Cr25Ni20 heat-resistant steel or materials matching the furnace temperature.

[0038] The bottom elevations of the steel pipe 1 9 , the steel pipe 2 11 and the steel pipe 3 20 are 10-20 mm lower than the lowest point of the bellows closest thereto.

Claims

1. A protective device for preventing a steel strip from scratching a bellows in a drying furnace, characterized in that: include: Coating roller (1), protector device 1 (3), bellows bracket (4), upper bellows (5), protector device 2 (6), gasket (7), protector device 1 hanger 1 (8), steel pipe 1 (9), protector device 1 hanger 2 (10), steel pipe 2 (11), protector device 1 bracket (12), bolts (13), nuts (14), washers (15), protector device 2 base 1 (16), protector device 2 base 2 (17), protector device 2 hanger 1 (18), protector device 2 hanger 2 (19), steel pipe 3 (20), No. 5 upper bellows (21), bottom plate 1 (22), support plate 1 (23), round steel 1 (24), bottom plate 2 (25), support plate 2 (26), round steel 2 (27); The upper bellows (5) are arranged in parallel with the track of the strip steel hanging curve in the drying furnace. The upper bellows (5) are composed of five bellows. A set of protector device 1 (3) is arranged in front of each bellows of the upper bellows (5). The height of the protector device 1 (3) is determined according to the lowest point of the corresponding bellows. A set of protector device 2 (6) is arranged behind the fifth upper bellows (21) to prevent the strip steel from scratching against the bellows. The protector device first bracket (12) is welded to the bellows bracket (4) to form a hanger in the width direction of the drying furnace, which is used to support or install the protector device first hanger first (8) and the protector device first hanger second (10); A protector device first hanger 1 (8) and a protector device first hanger 2 (10) are mounted on a protector device first bracket (12) by means of bolts (13) and nuts (14) and are used for mounting steel pipe 1 (9) and steel pipe 2 (11); When installing the protector device first hanger bracket 1 (8) and the protector device first hanger bracket 2 (10), the height of the hanger bracket is adjusted by the gasket (7) to ensure the horizontality requirement of the steel pipe 1 (9) and the steel pipe 2 (11); The protector device second base 1 (16) and the protector device second base 2 (17) are welded to the outer wall of the No. 5 upper wind box (21), and the protector device second base 1 (16) and the protector device second base 2 (17) are symmetrically arranged along the center line of the unit; The protector device second hanger one (18) and the protector device second hanger two (19) are respectively installed on the protector device second base one (16) and the protector device second base two (17) by bolts and nuts; the protector device first hanger one (8) and the protector device first hanger two (10) are both composed of a bottom plate one (22), a support plate one (23) and a round steel one (24); the support plate one (23) is vertically welded to the bottom plate one (22), a semicircular groove is opened on the support plate one (23), the diameter of the round steel is φ25, and the round steel one (24) is welded in the groove of the support plate one (23) for connecting the steel pipe one (9) and the steel pipe two (11); The protector device second hanger one (18) and the protector device second hanger two (19) are composed of a bottom plate two (25), a support plate two (26) and a round steel two (27); the support plate two (26) is vertically welded to the bottom plate two (25), a semicircular groove is opened on the support plate two (26), and the round steel two (27) is welded in the groove of the support plate two (26), the diameter of the round steel is φ48, and is used to install the steel pipe three (20).

2. A protective device for preventing a steel strip from scratching a bellows in a drying furnace according to claim 1, characterized in that: The steel pipe 1 (9) and the steel pipe 2 (11) are φ34×3.

2.

3. The protective device for preventing the steel strip from scratching the bellows in the drying furnace according to claim 1, characterized in that: Steel pipe three (20) is φ60×3.

9.

4. The protective device for preventing the steel strip from scratching the bellows in the drying furnace according to claim 1, characterized in that: The protector device is made of 06Cr25Ni20 heat-resistant steel or a material matching the furnace temperature.

5. The protective device for preventing the steel strip from scratching the bellows in the drying furnace according to claim 1, characterized in that: The bottom elevations of the steel pipe 1 (9), the steel pipe 2 (11) and the steel pipe 3 (20) are 10-20 mm lower than the lowest point of the bellows closest thereto.

6. The method for preventing a steel strip from scratching a bellows in a drying furnace according to claim 1, characterized in that: The steps include: 1) After the strip steel (2) has been coated with an insulating coating by a coating roller (1), it enters a drying furnace for heating. In the drying section, a wind box is used to heat the strip steel. The wind box is arranged parallel to the strip steel hanging curve. 2) In the drying section, the strip steel is suspended and runs under a certain tension; when the strip steel tension increases, the strip steel tends to be tensioned in the furnace, and its suspension curve approaches the upper bellows; 3) In order to prevent the steel strip from scraping against the lower edge of the upper bellows, a protector device 1 (3) and a protector device 2 (6) are arranged between the bellows; when the steel strip is about to scrape against the bellows, the steel strip first scrapes against the protective tube of the protector device, thereby avoiding damage to the steel strip and coating quality caused by the steel strip scraping against the bellows.

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