CN200952032Y - Air knife for controlling the thickness of the galvanized layer - Google Patents
Air knife for controlling the thickness of the galvanized layer Download PDFInfo
- Publication number
- CN200952032Y CN200952032Y CN 200620035571 CN200620035571U CN200952032Y CN 200952032 Y CN200952032 Y CN 200952032Y CN 200620035571 CN200620035571 CN 200620035571 CN 200620035571 U CN200620035571 U CN 200620035571U CN 200952032 Y CN200952032 Y CN 200952032Y
- Authority
- CN
- China
- Prior art keywords
- air knife
- unit
- labial lamina
- air
- knife
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 241000761557 Lamina Species 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 208000002925 dental caries Diseases 0.000 claims description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 abstract description 27
- 239000011701 zinc Substances 0.000 abstract description 27
- 229910052725 zinc Inorganic materials 0.000 abstract description 27
- 239000007788 liquid Substances 0.000 abstract description 16
- 229910000831 Steel Inorganic materials 0.000 abstract description 11
- 239000010959 steel Substances 0.000 abstract description 11
- 230000007547 defect Effects 0.000 abstract description 10
- 239000011248 coating agent Substances 0.000 abstract description 9
- 238000000576 coating method Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000015572 biosynthetic process Effects 0.000 abstract 2
- 238000007711 solidification Methods 0.000 description 9
- 230000008023 solidification Effects 0.000 description 9
- 238000001816 cooling Methods 0.000 description 4
- 229910001335 Galvanized steel Inorganic materials 0.000 description 3
- 241001676635 Lepidorhombus whiffiagonis Species 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000008397 galvanized steel Substances 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
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- Coating With Molten Metal (AREA)
Abstract
The utility model discloses an air knife used for controlling the thickness of galvanized coating and adapted to efficiently prevent the formation of defect in thickness of hot-dip galvanized sheet. The air knife comprises an air knife body (20) provided thereon with an upper blade (11) and a lower blade (12), and air knife slits (13) formed lengthways in a certain distance at the front end of each of the upper blade (11) and lower blade (12). The orthogonal projection of the air knife slit (13) has a parabolic shape. The utility model has the advantages that the orthogonal projection of the air knife slit is parabolic, so that the air flow from the air knife slits can uniformly act on the surface of strip steel in the length direction of the line of solidified liquid zinc, thereby preventing the formation of defect in thickness of hot-dip galvanized sheet; and the orthogonal projection of the air knife slit is conveniently adjusted to match with the line of solidified liquid zinc, thereby meeting the requirement of production of hot-dip galvanized sheets with different specifications.
Description
Technical field
The utility model relates to a kind of air knife that is used to control galvanized layer thickness in the hot-dip galvanized steel strip production line.
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.
The utility model content
Technical problem to be solved in the utility model 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 scheme that its technical problem that solves the utility model adopts is: the air knife that is used to control galvanized layer thickness of the present utility model, 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 beneficial effects of the utility model are, 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 utility model 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 utility model 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
Below in conjunction with drawings and Examples the utility model is further specified.
With reference to Fig. 6, the utility model 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 utility model 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 utility model 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 all belongs to the claim that the utility model is 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 |
|---|---|---|---|
| CN 200620035571 CN200952032Y (en) | 2006-09-13 | 2006-09-13 | Air knife for controlling the thickness of the galvanized layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620035571 CN200952032Y (en) | 2006-09-13 | 2006-09-13 | Air knife for controlling the thickness of the galvanized layer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200952032Y true CN200952032Y (en) | 2007-09-26 |
Family
ID=38810330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620035571 Expired - Lifetime CN200952032Y (en) | 2006-09-13 | 2006-09-13 | Air knife for controlling the thickness of the galvanized layer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200952032Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1928147A (en) * | 2006-09-12 | 2007-03-14 | 攀钢集团攀枝花钢铁研究院 | Air knife for controlling zinc coat thickness |
| CN102506570A (en) * | 2011-11-03 | 2012-06-20 | 北京太阳能电力研究院有限公司 | Air knife |
-
2006
- 2006-09-13 CN CN 200620035571 patent/CN200952032Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1928147A (en) * | 2006-09-12 | 2007-03-14 | 攀钢集团攀枝花钢铁研究院 | Air knife for controlling zinc coat thickness |
| CN1928147B (en) * | 2006-09-12 | 2012-09-19 | 攀钢集团攀枝花钢铁研究院 | Air knife for controlling the thickness of the galvanized layer |
| CN102506570A (en) * | 2011-11-03 | 2012-06-20 | 北京太阳能电力研究院有限公司 | Air knife |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20070926 |
|
| EXPY | Termination of patent right or utility model |