CN1928147A - Air knife for controlling zinc coat thickness - Google Patents
Air knife for controlling zinc coat thickness Download PDFInfo
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- CN1928147A CN1928147A CNA2006100218204A CN200610021820A CN1928147A CN 1928147 A CN1928147 A CN 1928147A CN A2006100218204 A CNA2006100218204 A CN A2006100218204A CN 200610021820 A CN200610021820 A CN 200610021820A CN 1928147 A CN1928147 A CN 1928147A
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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, carry 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, and galvanized layer thickness is controlled.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 thick than the middle part.The reason that causes is as follows: the cooling of strip edge portion is fast than the middle part, makes it be with zinc liquid line of solidification to 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 the two ends by air knife enter air chamber, and air-flow converges at the middle part of air knife and meets, and makes air knife middle part air pressure than the two ends height, and limit portion air pressure is low, scrapes the zinc amount and reduces; Air knife is jetted and is easily partly run off in limit portion to the air-flow 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 mainly contain following three kinds of modes at present: adopt many air cavity types air knife (stepping on air knife as 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 (as shown in Figure 3 and 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 super 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 the upper knife lip, the lower knife lip that install and fix thereon, 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 described air knife slit is parabola shaped.
After taking abovementioned technology, because the orthographicprojection in air knife slit is parabola shaped, air-flow through the ejection of air knife slit can act on belt steel surface equably on the whole length direction of zinc liquid line of solidification, therefore can suppress the thick generation of defects of pot galvanize edges of boards effectively.
As improvement of the technical scheme, for ease of make it suitable by the shape of adjusting the air knife slit with corresponding zinc liquid line of solidification, and the needs of adaptation different size heat zinc coating plate production, described 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; Described 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, last unit labial lamina are connected with air knife body by regulating bolt respectively on each.
As further improvement in the technical proposal, 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 described air knife is divided into 4 branch air cavitys by diaphragm structure, each minute, air cavity all disposed the pneumatic tube that is connected with compressed air source, and 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, air-flow through the ejection of air knife slit can act on belt steel surface equably on the whole length direction of zinc liquid line of solidification, 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 zinc pot rear 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, represents to be with the steel traffic direction with the arrow mark;
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. 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, toponym and corresponding mark among the figure: upper knife lip 11, go up unit labial lamina 11a, go up unit labial lamina 11b, lower unit labial lamina 11c, lower knife lip 12, lower unit labial lamina 12a, lower unit labial lamina 12b, lower unit labial lamina 12c, air knife slit 13, regulate bolt 14, air knife body 20, gas chamber 21, divide air cavity 21a, divide air cavity 21b, divide air cavity 21c, divide air cavity 21d, pneumatic tube 22, flow valve 23, filter screen 24.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
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 the upper knife lip 11, the lower knife lip 12 that install and fix thereon, 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 described 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.
For ease of make it suitable by the shape of adjusting the air knife slit with corresponding zinc liquid line of solidification, and the needs of adaptation different size heat zinc coating plate production, with reference to Fig. 5 and Fig. 6, described 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.Described 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 by regulating bolt 14 respectively on each.
In by the preferred embodiment shown in Fig. 5, the described quantity that goes up the unit labial lamina is three, promptly go up unit labial lamina 11a, 11b, 11c, last unit labial lamina 11b, 11c lay respectively at labial lamina 11a both sides, unit, and the upper surface of unit labial lamina 11a fits with the lower surface of last unit labial lamina 11b, 11c on lateral overlap section position.The quantity of described lower unit labial lamina is three, be lower unit labial lamina 12a, 12b, 12c, lower unit labial lamina 12b, 12c lay respectively at lower unit labial lamina 12a both sides, fit at the upper surface of lateral overlap section position lower unit labial lamina 12a and the lower surface of lower unit labial lamina 12b, 12c.
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 described air knife body 20 is divided into 4 branch air cavity 21a, 21b, 21c, 21d by diaphragm structure, divide air cavity 21a, 21b, 21c, 21d all to dispose the pneumatic tube 22 that is connected with compressed air source, each pneumatic tube 22 is provided with the flow valve 23 that is used for the adjustments of gas flow.In the described 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, adjust air knife slit 13 by regulating bolt 14, make air knife slit 13 shapes suitable with corresponding zinc liquid line of solidification, by flow valve 23 that the airshed size adjustment of 4 branch air cavity 21a, 21b, 21c, 21d is parabola shaped to what suit, can farthest suppress the thick generation of defects of pot galvanize edges of boards.
Above the described 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 is not to be shown in the air knife that the present invention will be used to control galvanized layer thickness is confined to and in the described concrete structure and the scope of application, so every the corresponding modify and equivalent that might be utilized, the claim that all belongs to the present invention and applied for.
Claims (6)
1, is used to control the air knife of galvanized layer thickness, comprise air knife body (20) and install and fix thereon upper knife lip (11), lower knife lip (12), 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 described 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: described 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; Described 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) by regulating bolt (14) respectively on each.
3, as being used to control the air knife of galvanized layer thickness as described in the claim 2, it is characterized in that: the described quantity that goes up the unit labial lamina is three, promptly goes up unit labial lamina (11a, 11b, 11c); Last unit labial lamina (11b, 11c) lays respectively at unit labial lamina (11a) both sides, and the lower surface of the upper surface of unit labial lamina (11a) and last unit labial lamina (11b, 11c) fits on lateral overlap section position.
4, as being used to control the air knife of galvanized layer thickness as described in claim 2 or 3, it is characterized in that: the quantity of described lower unit labial lamina is three, i.e. lower unit labial lamina (12a, 12b, 12c); Lower unit labial lamina (12b, 12c) lays respectively at lower unit labial lamina (12a) both sides, fits at the upper surface of lateral overlap section position lower unit labial lamina (12a) and the lower surface of lower unit labial lamina (12b, 12c).
5, be used to control the air knife of galvanized layer thickness as claimed in claim 1 or 2, it is characterized in that: the gas chamber (21) in the described air knife body (20) is divided into 4 branch air cavitys (21a, 21b, 21c, 21d) by diaphragm structure, divide air cavity (21a, 21b, 21c, 21d) all to dispose the pneumatic tube (22) that is connected with compressed air source, each pneumatic tube (22) is provided with the flow valve (23) that is used for the adjustments of gas flow.
6, as being used to control the air knife of galvanized layer thickness as described in the claim 5, it is characterized in that: in the described 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 true CN1928147A (en) | 2007-03-14 |
| CN1928147B 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 |
Country Status (1)
| Country | Link |
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| CN (1) | CN1928147B (en) |
Cited By (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 |
| CN102886323A (en) * | 2011-07-18 | 2013-01-23 | 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 |
| CN106460139A (en) * | 2015-03-30 | 2017-02-22 | 株式会社三旴Eco | Air knife width changing device having excellent operation efficiency |
| CN106929790A (en) * | 2017-04-05 | 2017-07-07 | 华中科技大学 | It is a kind of to suppress excessively zinc-plated air knife method for designing of edge and products thereof |
| CN110088348A (en) * | 2016-12-22 | 2019-08-02 | 塔塔钢铁艾默伊登有限责任公司 | Air wipe device and nozzle for air wipe device |
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 (1)
| 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 * |
Cited By (10)
| 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 |
| CN102886323A (en) * | 2011-07-18 | 2013-01-23 | 宝山钢铁股份有限公司 | Narrow slit nozzle |
| 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 |
| CN106460139A (en) * | 2015-03-30 | 2017-02-22 | 株式会社三旴Eco | Air knife width changing device having excellent operation efficiency |
| CN106460139B (en) * | 2015-03-30 | 2018-08-24 | 株式会社三旴Eco | The variable-width device of the outstanding air knife of operational efficiency |
| CN110088348A (en) * | 2016-12-22 | 2019-08-02 | 塔塔钢铁艾默伊登有限责任公司 | Air wipe device and nozzle for air wipe device |
| CN110088348B (en) * | 2016-12-22 | 2021-12-10 | 塔塔钢铁艾默伊登有限责任公司 | Air wiping device and nozzle for an air wiping device |
| CN106929790A (en) * | 2017-04-05 | 2017-07-07 | 华中科技大学 | It is a kind of to suppress excessively zinc-plated air knife method for designing of edge and products thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1928147B (en) | 2012-09-19 |
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