CN1928147B - Air knife for controlling zinc coat thickness - Google Patents
Air knife for controlling zinc coat thickness Download PDFInfo
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- CN1928147B CN1928147B CN200610021820A CN200610021820A CN1928147B CN 1928147 B CN1928147 B CN 1928147B CN 200610021820 A CN200610021820 A CN 200610021820A CN 200610021820 A CN200610021820 A CN 200610021820A CN 1928147 B CN1928147 B CN 1928147B
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- labial lamina
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Abstract
The present invention discloses one kind of air knife for controlling galvanized coating thickness, and the air knife can inhibit side thickness fault of hot galvanized plate effectively. The air knife includes one air knife body, one upper knife lip and one lower knife lip fixed onto the air knife body and forming in the front ends one longitudinal air knife gap in a parabolic orthographic projection. The present invention is superior in that the air knife gap can spray airflow acting homogeneously to the surface of the band steel in the whole length of the zinc solution solidifying line to inhibit side thickness fault of hot galvanized plate effectively, and that the air knife gap has conveniently adjustable parabolic profile for fitting different sizes of hot galvanized plate.
Description
Technical field
The present invention relates to a kind of air knife that in the hot-dip galvanized steel strip production line, is used to control galvanized layer thickness.
Background technology
On the hot-dip galvanized steel strip production line, all adopt the thickness of air knife control strip steel Zn-plating layer; Promptly outside the forward and backward surface of band steel, one group of corresponding air knife is set respectively, in air knife, carries pressurized air in the production process, pressurized air sprays through in the seam shape nozzle of air knife; Form the flat air-flow of successive; Before the zinc liquid that the band steel is taken out of from the zinc pot solidified, air-flow was scraped unnecessary zinc liquid as blade and is flowed back in the zinc pot, made galvanized layer thickness be able to control.Scrape square being directly proportional of zinc amount and airshed, air knife whiff pressure and air knife wavelength width of a slit.
On original hot-dip galvanized steel strip production line, the orthographicprojection in air knife slit is elongated rectangle (as shown in Figure 2), and its weak point is to be difficult to overcome the thick problem in coating limit, promptly is with steel widthwise edge end coating than thicker.The reason that causes is following: the cooling of strip edge portion is fast than the middle part, makes its zinc liquid line of solidification of being be parabola shaped, and limit portion solidifies soon, scrapes the zinc amount and reduces (as shown in Figure 1); The air feed of air knife is that air-flow converges at the middle part of air knife and meets by the two ends entering air chamber of air knife, makes that air knife middle part air pressure is high than two ends, and limit portion air pressure is low, scrapes the zinc amount and reduces; Air knife is jetted to air-flow easy part loss of portion on the limit of band steel, and limit portion airshed is reduced, and scrapes the zinc amount and reduces.
In order to suppress the thick generation of defects in limit; Improve the homogeneity of coating; The technical measures that adopt both at home and abroad at present mainly contain following three kinds of modes: adopt many air cavity types air knife (stepping on air knife like the side), each gas chamber's gaseous tension is independent adjustable, so that limit portion air pressure is greater than the middle part; Adopt arc slit air knife (like Fig. 3 and shown in Figure 4), with the reduction of compensation limit portion air pressure; If edge guard or limit closure assembly are to reduce the loss of limit portion airshed.Because blowing gas when scraping zinc, also has cooling effect to zinc liquid, along with the raising of airshed and whiff pressure; Blowing gas is accelerated the speed of cooling of zinc liquid; Surpass certain pressure, the cooling effect meeting accounts for the superiors, at this moment the coating phenomenon that can occur thickening on the contrary.Therefore; To improve limit portion's airshed and whiff pressure is that the thick restraining effect of the abovementioned technology opposite side of principal character is very limited; Especially unit is under the high-speed cruising processing condition of the low speed of ultra thick specification and ultra-thin specification, and the thick generation in limit is still inevitably.
Summary of the invention
Technical problem to be solved by this invention provides a kind of air knife that is used to control galvanized layer thickness, and it can suppress the thick generation of defects of pot galvanize edges of boards effectively.
The technical solution adopted for the present invention to solve the technical problems is: the air knife that is used to control galvanized layer thickness of the present invention; Comprise air knife body and install and fix upper knife lip, lower knife lip on it; Upper knife lip, lower knife lip front end edge longitudinal interval form the air knife slit, and it is characterized in that: the orthographicprojection in said air knife slit is parabola shaped.
After taking abovementioned technology; Because the orthographicprojection in air knife slit is parabola shaped; The air-flow of ejection can act on belt steel surface equably on the whole length direction of zinc liquid line of solidification through the air knife slit, therefore can suppress the thick generation of defects of pot galvanize edges of boards effectively.
Improvement as technique scheme; Make it suitable for ease of shape with corresponding zinc liquid line of solidification through adjustment air knife slit; And the needs of adaptation different size heat zinc coating plate production; Said upper knife lip is combined into by at least three curved last unit labial laminas of its lower surface, has the lateral overlap section on each between the unit labial lamina; Said lower knife lip is combined into by at least three curved lower unit labial laminas of its upper surface, has the lateral overlap section between each lower unit labial lamina; Unit labial lamina, lower unit labial lamina are connected with air knife body through regulating bolt respectively on each.
Further improvement as technique scheme; For making stream pressure adjustable on parabola shaped whole length direction along the air knife slit; To suppress the thick generation of defects of pot galvanize edges of boards better; The intravital gas chamber of said air knife is divided into 4 branch air cavitys by diaphragm structure, each minute air cavity all dispose the pneumatic tube that is connected with compressed air source, each pneumatic tube is provided with the flow valve that is used for the adjustments of gas flow.
The invention has the beneficial effects as follows; Because the orthographicprojection in air knife slit is parabola shaped; The air-flow of ejection can act on belt steel surface equably on the whole length direction of zinc liquid line of solidification through the air knife slit, therefore can suppress the thick generation of defects of pot galvanize edges of boards effectively; The parabola shaped of air knife slit can be adjusted easily, makes it suitable with corresponding zinc liquid line of solidification, and can adapt to the needs that the different size heat zinc coating plate is produced well.
Description of drawings
This specification sheets comprises following seven width of cloth accompanying drawings:
Fig. 1 is that the band steel goes out behind the zinc pot surface and takes zinc liquid out of and solidify synoptic diagram, is represented by dotted lines the zinc liquid line of solidification that is parabola shaped among the figure, representes to be with the steel traffic direction with arrow labeled;
Fig. 2 is the air knife slit orthograph of existing air knife, and the air knife slit is elongated rectangle;
Fig. 3 is the air knife slit orthograph of existing air knife, and the air knife slit is arc;
Fig. 5 is the air knife slit orthograph that the present invention is used to control the air knife of galvanized layer thickness, and the air knife slit is parabola shaped;
Fig. 4 is the air knife slit orthograph of existing air knife, and the air knife slit is arc;
Fig. 5 is the air knife slit orthograph that the present invention is used to control the air knife of galvanized layer thickness, and the air knife slit is parabola shaped;
Fig. 6 is the longitudinal diagram that the present invention is used to control the air knife of galvanized layer thickness;
Fig. 7 is the sectional view along A-A line among Fig. 6.
Component among the figure; Toponym and corresponding mark: upper knife lip 11; Labial lamina 11a in unit on first; Labial lamina 11b in unit on second; The 3rd lower unit labial lamina 11c; Lower knife lip 12; The first lower unit labial lamina 12a; The second lower unit labial lamina 12b; The 3rd lower unit labial lamina 12c; Air knife slit 13; Regulate bolt 14; Air knife body 20; Gas chamber 21; First fen air cavity 21a; Second fen air cavity 21b; The 3rd fen air cavity 21c; The 4th fen air cavity 21d; Pneumatic tube 22; Flow valve 23; Filter screen 24.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
With reference to Fig. 6, the present invention is used to control the air knife of galvanized layer thickness, comprises air knife body 20 and installs and fixes upper knife lip 11, lower knife lip 12 on it, and upper knife lip 11, lower knife lip 12 front end edge longitudinal intervals form air knife slit 13.With reference to Fig. 5, the orthographicprojection in said air knife slit 13 is parabola shaped.Because the orthographicprojection in air knife slit 13 is parabola shaped, the air-flow of 13 ejections can act on belt steel surface equably on the whole length direction of zinc liquid line of solidification through the air knife slit, therefore can suppress the thick generation of defects of pot galvanize edges of boards effectively.
Make it suitable for ease of shape with corresponding zinc liquid line of solidification through adjustment air knife slit; And the needs of adaptation different size heat zinc coating plate production; With reference to Fig. 5 and Fig. 6; Said upper knife lip 11 is combined into by at least three curved last unit labial laminas of its lower surface, has the lateral overlap section on each between the unit labial lamina.Said lower knife lip 12 is combined into by at least three curved lower unit labial laminas of its upper surface, has the lateral overlap section between each lower unit labial lamina; Unit labial lamina, last unit labial lamina are connected with air knife body 20 through regulating bolt 14 respectively on each.
In by the preferred embodiment shown in Fig. 5; The said quantity that goes up the unit labial lamina is three; I.e. unit labial lamina 11c on the unit labial lamina 11b, the 3rd on the unit labial lamina 11a, second on first; On second on the unit labial lamina 11b and the 3rd unit labial lamina 11c lay respectively at labial lamina 11a both sides, unit on first, the lower surface of unit labial lamina 11c fits on unit labial lamina 11b and the 3rd on the upper surface and second of unit labial lamina 11a on the lateral overlap section position first.The quantity of said lower unit labial lamina is three; The i.e. first lower unit labial lamina 12a, the second lower unit labial lamina 12b, the 3rd lower unit labial lamina 12c; The second lower unit labial lamina 12b and the 3rd lower unit labial lamina 12c lay respectively at the first lower unit labial lamina 12a both sides, and the lower surface of the upper surface of the first lower unit labial lamina 12a and the second lower unit labial lamina 12b and the 3rd lower unit labial lamina 12c fits at lateral overlap section position.
For making stream pressure adjustable on parabola shaped whole length direction along the air knife slit; To suppress the thick generation of defects of pot galvanize edges of boards better; With reference to Fig. 7; Gas chamber 21 in the said air knife body 20 is divided into first fen air cavity 21a, second fen air cavity 21b, the 3rd fen air cavity 21c, the 4th fen air cavity 21d by diaphragm structure, and these 4 branch air cavitys all dispose the pneumatic tube 22 that is connected with compressed air source, and each pneumatic tube 22 is provided with the flow valve 23 that is used for the adjustments of gas flow.In the said air knife body 20, gas chamber 21 outlet positions are provided with filter screen 24, with elimination impurity.
In the production; According to unit speed and target thickness of coating; Through regulating bolt 14 adjustment air knife slits 13; Make air knife slit 13 shapes suitable with corresponding zinc liquid line of solidification, through flow valve 23 that the airshed size adjustment of 4 branch air cavitys is parabola shaped to what suit, can farthest suppress the thick generation of defects of pot galvanize edges of boards.
Above the said the present invention that just explains through diagrams be used to control some principles of the air knife of galvanized layer thickness; Because the those of ordinary skill to constructed field is easy to carry out on this basis some modifications and change; Therefore this specification sheets be not be to the air knife that the present invention is used to control galvanized layer thickness be confined to shown in the described concrete structure and the scope of application in; So every the modify and equivalent that might be utilized, the claim that all belongs to the present invention and applied for.
Claims (6)
1. be used to control the air knife of galvanized layer thickness; Comprise air knife body (20) and install and fix upper knife lip (11), lower knife lip (12) on it; Upper knife lip (11), lower knife lip (12) front end edge longitudinal interval form air knife slit (13), and it is characterized in that: the orthographicprojection in said air knife slit (13) is parabola shaped.
2. be used to control the air knife of galvanized layer thickness according to claim 1, it is characterized in that: said upper knife lip (11) is combined into by at least three curved last unit labial laminas of its lower surface, has the lateral overlap section on each between the unit labial lamina; Said lower knife lip (12) is combined into by at least three curved lower unit labial laminas of its upper surface, has the lateral overlap section between each lower unit labial lamina; Unit labial lamina, lower unit labial lamina are connected with air knife body (20) through regulating bolt (14) respectively on each.
3. like the said air knife that is used to control galvanized layer thickness of claim 2, it is characterized in that: the said quantity that goes up the unit labial lamina is three, i.e. unit labial lamina (11c) on the unit labial lamina (11b) and the 3rd on the unit labial lamina (11a), second on first; On second on the unit labial lamina (11b) and the 3rd unit labial lamina (11c) lay respectively at unit labial lamina (11a) both sides on first, the lower surface of unit labial lamina (11c) fits on unit labial lamina (11b) and the 3rd on the upper surface and second of unit labial lamina (11a) on the lateral overlap section position first.
4. like claim 2 or the 3 said air knives that are used to control galvanized layer thickness, it is characterized in that: the quantity of said lower unit labial lamina is three, i.e. the first lower unit labial lamina (12a), the second lower unit labial lamina (12b) and the 3rd lower unit labial lamina (12c); The second lower unit labial lamina (12b) and the 3rd lower unit labial lamina (12c) lay respectively at first lower unit labial lamina (12a) both sides, and the lower surface of the upper surface of the first lower unit labial lamina (12a) and the second lower unit labial lamina (12b) and the 3rd lower unit labial lamina (12c) fits at lateral overlap section position.
5. be used to control the air knife of galvanized layer thickness according to claim 1 or claim 2; It is characterized in that: the gas chamber (21) in the said air knife body (20) is divided into 4 branch air cavitys by diaphragm structure; Each divides air cavity all to dispose the pneumatic tube (22) that is connected with compressed air source, and each pneumatic tube (22) is provided with the flow valve (23) that is used for the adjustments of gas flow.
6. like the said air knife that is used to control galvanized layer thickness of claim 5, it is characterized in that: in the said air knife body (20), gas chamber (21) outlet position is provided with filter screen (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610021820A CN1928147B (en) | 2006-09-12 | 2006-09-12 | Air knife for controlling zinc coat thickness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610021820A CN1928147B (en) | 2006-09-12 | 2006-09-12 | Air knife for controlling zinc coat thickness |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1928147A CN1928147A (en) | 2007-03-14 |
| CN1928147B true CN1928147B (en) | 2012-09-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200610021820A Expired - Fee Related CN1928147B (en) | 2006-09-12 | 2006-09-12 | Air knife for controlling zinc coat thickness |
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| Country | Link |
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| CN (1) | CN1928147B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101445900B (en) * | 2008-12-25 | 2010-06-09 | 杭州创宇金属制品科技有限公司 | Device and method for controlling thickness of hot-dipped galvanized layer or zinc alloy layer of steel wire |
| CN101768711B (en) * | 2008-12-29 | 2011-09-28 | 襄樊博亚精工机器有限公司 | Automatic cleaning device for lip of air knife |
| CN102886323B (en) * | 2011-07-18 | 2014-12-24 | 宝山钢铁股份有限公司 | Narrow slit nozzle |
| CN104213063A (en) * | 2014-10-11 | 2014-12-17 | 攀钢集团攀枝花钢钒有限公司 | Plating thickness control method |
| KR101566216B1 (en) * | 2015-03-30 | 2015-11-09 | 주식회사 삼우에코 | Device adjusting width of airknife improving operating efficiency |
| EP3559300B1 (en) * | 2016-12-22 | 2022-06-01 | Tata Steel IJmuiden B.V. | Gas wiping device |
| CN106929790B (en) * | 2017-04-05 | 2019-08-09 | 华中科技大学 | A kind of air knife design method and products thereof for inhibiting edge excessively zinc-plated |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4719129A (en) * | 1987-02-09 | 1988-01-12 | Armco Inc. | Multiple nozzle jet finishing |
| US6199301B1 (en) * | 1997-01-22 | 2001-03-13 | Industrial Automation Services Pty. Ltd. | Coating thickness control |
| CN200952032Y (en) * | 2006-09-13 | 2007-09-26 | 攀钢集团攀枝花钢铁研究院 | Airblade for controlling Zinc coat thickness |
-
2006
- 2006-09-12 CN CN200610021820A patent/CN1928147B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4719129A (en) * | 1987-02-09 | 1988-01-12 | Armco Inc. | Multiple nozzle jet finishing |
| US6199301B1 (en) * | 1997-01-22 | 2001-03-13 | Industrial Automation Services Pty. Ltd. | Coating thickness control |
| CN200952032Y (en) * | 2006-09-13 | 2007-09-26 | 攀钢集团攀枝花钢铁研究院 | Airblade for controlling Zinc coat thickness |
Non-Patent Citations (2)
| Title |
|---|
| 朱立.热镀锌钢板生产概述 第七讲 镀锌设备及相关技术.鞍钢技术 10.1999,(10),58-62. |
| 热镀锌钢板生产概述 第七讲 镀锌设备及相关技术;朱立;鞍钢技术 10;19991231(10);58-62 * |
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| CN1928147A (en) | 2007-03-14 |
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Granted publication date: 20120919 Termination date: 20160912 |