CN104109829B - Continuous galvanizing line air knife working width control method - Google Patents
Continuous galvanizing line air knife working width control method Download PDFInfo
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- CN104109829B CN104109829B CN201310139126.2A CN201310139126A CN104109829B CN 104109829 B CN104109829 B CN 104109829B CN 201310139126 A CN201310139126 A CN 201310139126A CN 104109829 B CN104109829 B CN 104109829B
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Abstract
The invention discloses a kind of continuous galvanizing line air knife working width control method, it includes step: the air knife nozzle radical occlusion device controlling transmission side and fore side marches to given position from home position on strip width direction；When strip steel weld joint marches to away from air knife certain distance on strip length direction, the air knife nozzle radical occlusion device controlling transmission side and fore side returns to home position；When strip steel weld joint marches at air knife on strip length direction, the air knife nozzle radical occlusion device controlling transmission side and fore side marches to given position from home position.Continuous galvanizing line air knife working width control method of the present invention can regulate air knife working width according to the developed width of strip steel, thus improves control accuracy, has saved the energy.
Description
Technical field
The present invention relates to the control method in a kind of band production process, particularly relate to a kind of air knife working width control method that band is jetted.
Background technology
In continuous galvanizing line production technology, the control of zinc pot level accuracy and zinc slag content is to control automobile exterior panel surface zinc gray or the key of cadmia defect.The production technology controlling continuous galvanizing line needs air knife to jet plate surface.
Traditional air knife apparatus uses machine readable control model, and this control model is blow gas in the width gamut of air knife body, and this gas can be air or nitrogen.
In actual application, when using machine readable control model, frequent produced problem mainly has:
Zinc pot Liquid level precision technological requirement within ± 1mm when 1, can not meet normal production, can not effectively control the zinc slag content in zinc pot, thus occurs the mass defects such as the zinc gray or the cadmia that differ in size on the belt steel surface after zinc-plated；Too much cadmia had both added the unit zinc consumption of unit, and dragging for cadmia operation continually is also unfavorable for the control of zinc pot level accuracy simultaneously；
2, waste source of the gas, increases energy resource consumption, causes the rising of the unit cost of production；
3, when unit is in more than 100m/min speed high-speed production; zinc slag content in zinc pot can increase rapidly; production operation personnel would generally take to strengthen the frequency dragging for cadmia; owing to working environment temperature is high; liquid zinc of zinc pot temperature reaches about 460 DEG C; there is certain potential safety hazard during operation, hand labor intensity is bigger.
Summary of the invention
It is an object of the invention to provide a kind of continuous galvanizing line air knife working width control method, in the method, the width of air knife blowing gas changes with the change of strip width, thus improves control accuracy, also reduces energy resource consumption.
In order to reach foregoing invention purpose, the invention provides a kind of continuous galvanizing line air knife working width control method, it comprises the following steps:
(1) start；
(2) the air knife nozzle radical occlusion device controlling transmission side and fore side all marches to given position from home position on strip width direction；
(3) when strip steel weld joint marches to the distance away from air knife 10-20s on strip length direction, the air knife nozzle radical occlusion device controlling transmission side and fore side all returns to home position；
(4) marching at air knife when strip steel weld joint on strip length direction, the air knife nozzle radical occlusion device controlling transmission side and fore side all marches to given position from home position；
In above-mentioned steps (2) and (4), the set-point S from home position to given position is:
S={W-(W1+W2) }/2+A
Wherein, W is air knife body width value, and unit is mm；Strip width is made up of transmission side strip width and fore side strip width two parts, wherein transmission side strip width is that transmission side strip edge is along the distance to unit centre line, fore side strip width is that fore side strip edge is along the distance to unit centre line, W1 is the current measured value of transmission side strip width, and unit is mm；W2 is the current measured value of fore side strip width, and unit is mm；A is default safety clearance value, and it is the distance at air knife edge in the direction of the width and the strip width edge of its homonymy, and unit is mm；
(5) terminate.
Further, above-mentioned continuous galvanizing line air knife working width control method further comprises the steps of: when strip steel side-play amount (absolute value of the difference of W1 and W2) in the direction of the width is more than a first threshold, and the air knife nozzle radical occlusion device controlling transmission side and fore side returns to home position.
Further, in above-mentioned continuous galvanizing line air knife working width control method, the span of described first threshold is 10-20mm.
Further, above-mentioned continuous galvanizing line air knife working width control method further comprises the steps of: when the difference of the strip width value that strip width measured value and host computer issue is more than a Second Threshold, and the air knife nozzle radical occlusion device controlling transmission side and fore side returns to home position.
Further, in above-mentioned continuous galvanizing line air knife working width control method, the span of described Second Threshold is 15-25mm.
Further, in above-mentioned continuous galvanizing line air knife working width control method, the air knife nozzle radical occlusion device controlling described transmission side and fore side is synchronized with the movement.
Further, in above-mentioned continuous galvanizing line air knife working width control method, the span of described safety clearance value A is 50-150mm.
Further, in step (4) in above-mentioned continuous galvanizing line air knife working width control method, when strip steel weld joint marches at air knife on strip length direction, time delay one time delay, then the air knife nozzle radical occlusion device controlling transmission side and fore side marches to given position from home position.
Further, in above-mentioned continuous galvanizing line air knife working width control method, described time delay is 1-3s.
Further, in the step (4) of above-mentioned continuous galvanizing line air knife working width control method, when strip steel weld joint marches to the distance away from air knife 15s on strip length direction, the air knife nozzle radical occlusion device controlling transmission side and fore side all returns to home position.
Technical solutions according to the invention have employed strip width control model, and the most existing machine readable control model has the advantage that
1, zinc pot Liquid level precision in the normal production technological requirement within ± 1mm can not only be met, also the zinc slag content in zinc pot can effectively be controlled, thus effectively eliminate and the mass defects such as the zinc gray or the cadmia that differ in size occur on the belt steel surface after zinc-plated, improve the lumber recovery of unit, reduce the unit zinc consumption of unit simultaneously；
2, air knife apparatus only blow out air or nitrogen in the range of strip width, if according to W=2000mm, strip width scope 700～1630mm calculates, and can save the source of the gas of 58.2%, greatly reduce the unit cost of production；
3, it is substantially reduced production operation personnel and drags for the frequency of cadmia, reduce potential safety hazard, reduce hand labor intensity.
Accompanying drawing explanation
Fig. 1 is the structural representation of the air knife apparatus related in continuous galvanizing line air knife working width control method of the present invention.
Fig. 2 is the continuous galvanizing line air knife working width control method of the present invention flow chart under a kind of embodiment.
Detailed description of the invention
According to specific embodiment and Figure of description, continuous galvanizing line air knife working width control method of the present invention will be described further below, but specific embodiment and related description will be not intended that the improper restriction for technical scheme.
Fig. 1 shows the structure of the air knife apparatus related in continuous galvanizing line air knife working width control method of the present invention.As can be seen from Figure 1 the width of air knife body 1 is W, its width more than strip steel P.Centrage O in Fig. 1 is unit centre line, and the distance at two edges on strip steel P width to unit centre line is respectively transmission side strip width and fore side strip width.PLC not shown in figure sends control instruction, control step motor drive gear mechanism 3, and then drive the air knife nozzle radical occlusion device 2 of transmission side and fore side to move on the width of air knife body 1, block the nozzle of air knife body, thus realize the regulation of the working width to air knife body 1 blowing gas.Sensor not shown in figure is used for detecting transmission side strip width and fore side strip width.
In the present embodiment, air knife body width value W=2000mm；Strip steel in traveling be the width welded together be the leading strip steel of 1464mm and rear row strip steel that a width is 1574mm；The distance at the strip width edge of air knife edge in the direction of the width and its homonymy, i.e. safety clearance value A is set as 100mm.
As in figure 2 it is shown, continuous galvanizing line air knife working width control method comprises the following steps:
(1) start；
(2) control the air knife nozzle radical occlusion device of transmission side and fore side on strip width direction synchronously from home position traveling set-point S to given position；
S={W-(W1+W2) }/2+A={2000-(730+734) }/2+100=368(mm)
Wherein, W1 is the current measured value of transmission side strip width, and W2 is the current measured value of fore side strip width；
(3) when strip steel weld joint marches to away from air knife 15s distance on strip length direction, the air knife nozzle radical occlusion device synchronizing moving of transmission side and fore side is controlled to return to home position；
(4) march at air knife when strip steel weld joint on strip length direction, postpone to control after 2s the air knife nozzle radical occlusion device of transmission side and fore side synchronously from home position traveling set-point S ' to given position；
S '=W-(W1 '+W2 ')/2+A={2000-(785+789)/2+100=313(mm)
(5) terminate.
In the present embodiment, control PLC monitors strip steel side-play amount (absolute value of the difference of W1 and W2) in the direction of the width the most in real time, and when this side-play amount is more than first threshold 15mm, the air knife nozzle radical occlusion device controlling transmission side and fore side returns to home position.This step can find sideslip or the skew of strip steel in time, thus in the case of strip running deviation or skew, shutdown is adjusted.
In addition, in the present embodiment, the difference of the strip width value that strip width measured value and host computer issue also can be detected by control PLC, if this difference exceedes Second Threshold 20mm, control PLC can control the air knife nozzle radical occlusion device of transmission side and fore side and return to home position.This is in order to the width value alternative one preventing width measured value and host computer from issuing is wrong data, thus finds mistake in time, carries out verification and checks.
Those of ordinary skill in the art will be appreciated that, above embodiment is intended merely to the present invention is described, and it is not used as limitation of the invention, as long as in the essential scope of the present invention, change or modification to embodiment described above all will fall in the range of claims of the present invention.
Claims (10)
1. a continuous galvanizing line air knife working width control method, it is characterised in that comprise the following steps:
(1) start；
(2) the air knife nozzle radical occlusion device controlling transmission side and fore side all marches to given position from home position on strip width direction；
(3) when strip steel weld joint marches to the distance away from air knife 10-20s on strip length direction, the air knife nozzle radical occlusion device controlling transmission side and fore side all returns to home position；
(4) marching at air knife when strip steel weld joint on strip length direction, the air knife nozzle radical occlusion device controlling transmission side and fore side all marches to given position from home position；
In above-mentioned steps (2) and (4), the set-point S from home position to given position is:
S={W-(W1+W2) }/2+A
Wherein, W is air knife body width value, and unit is mm；W1 is the current measured value of transmission side strip width, and unit is mm；W2 is the current measured value of fore side strip width, and unit is mm；A is default safety clearance value, and it is the distance at air knife edge in the direction of the width and the strip width edge of its homonymy, and unit is mm；
(5) terminate.
2. continuous galvanizing line air knife working width control method as claimed in claim 1, it is characterized in that, further comprising the steps of: when strip steel side-play amount in the direction of the width is more than a first threshold, the air knife nozzle radical occlusion device controlling transmission side and fore side returns to home position.
3. continuous galvanizing line air knife working width control method as claimed in claim 1, it is characterized in that, further comprising the steps of: when the difference of the strip width value that strip width measured value and host computer issue is more than a Second Threshold, the air knife nozzle radical occlusion device controlling transmission side and fore side returns to home position.
4. continuous galvanizing line air knife working width control method as claimed in claim 1, it is characterised in that the air knife nozzle radical occlusion device controlling described transmission side and fore side is synchronized with the movement.
5. continuous galvanizing line air knife working width control method as claimed in claim 1, it is characterised in that the span of described safety clearance value A is 50-150mm.
6. continuous galvanizing line air knife working width control method as claimed in claim 2, it is characterised in that the span of described first threshold is 10-20mm.
7. continuous galvanizing line air knife working width control method as claimed in claim 3, it is characterised in that the span of described Second Threshold is 15-25mm.
8. continuous galvanizing line air knife working width control method as claimed in claim 1, it is characterized in that, in step (4), when strip steel weld joint marches at air knife on strip length direction, time delay one time delay, then the air knife nozzle radical occlusion device controlling transmission side and fore side marches to given position from home position.
9. continuous galvanizing line air knife working width control method as claimed in claim 8, it is characterised in that described time delay is 1-3s.
10. continuous galvanizing line air knife working width control method as claimed in claim 1, it is characterized in that, in step (3), when strip steel weld joint marches to the distance away from air knife 15s on strip length direction, the air knife nozzle radical occlusion device controlling transmission side and fore side all returns to home position.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310139126.2A CN104109829B (en) | 2013-04-19 | 2013-04-19 | Continuous galvanizing line air knife working width control method |
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| CN201310139126.2A CN104109829B (en) | 2013-04-19 | 2013-04-19 | Continuous galvanizing line air knife working width control method |
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| CN104109829B true CN104109829B (en) | 2016-08-03 |
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| CN107794481A (en) * | 2017-10-20 | 2018-03-13 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of stair like control strategy method of galvanized wire air knife position |
| CN114480995B (en) * | 2020-11-13 | 2023-12-05 | 上海梅山钢铁股份有限公司 | Air current nozzle shelters from device |
| CN113481454B (en) * | 2021-07-08 | 2023-06-27 | 攀钢集团攀枝花钢钒有限公司 | Control method for automatic opening of air knife after strip steel deviates in furnace |
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|---|---|---|---|---|
| JPH01290755A (en) * | 1988-05-19 | 1989-11-22 | Sumitomo Metal Ind Ltd | Method for preventing edge overcoating of hot-dipped steel sheet |
| FR2690170A1 (en) * | 1992-04-17 | 1993-10-22 | Clecim Sa | Device with an air knife regulating a metal deposit. |
| CN1610763A (en) * | 2001-08-24 | 2005-04-27 | Posco公司 | Apparatus for controlling coating weight on strip in continuous galvanizing process |
| CN101208449A (en) * | 2005-06-30 | 2008-06-25 | Abb公司 | A device and a method for controlling thickness |
| CN101967617A (en) * | 2010-10-15 | 2011-02-09 | 宝钢股份黄石涂镀板有限公司 | Automatic air knife tracking and adjusting device |
| CN102212768A (en) * | 2011-05-31 | 2011-10-12 | 攀钢集团有限公司 | Method for accurately adjusting air knife for controlling galvanized layer thickness |
-
2013
- 2013-04-19 CN CN201310139126.2A patent/CN104109829B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01290755A (en) * | 1988-05-19 | 1989-11-22 | Sumitomo Metal Ind Ltd | Method for preventing edge overcoating of hot-dipped steel sheet |
| FR2690170A1 (en) * | 1992-04-17 | 1993-10-22 | Clecim Sa | Device with an air knife regulating a metal deposit. |
| CN1610763A (en) * | 2001-08-24 | 2005-04-27 | Posco公司 | Apparatus for controlling coating weight on strip in continuous galvanizing process |
| CN101208449A (en) * | 2005-06-30 | 2008-06-25 | Abb公司 | A device and a method for controlling thickness |
| CN101967617A (en) * | 2010-10-15 | 2011-02-09 | 宝钢股份黄石涂镀板有限公司 | Automatic air knife tracking and adjusting device |
| CN102212768A (en) * | 2011-05-31 | 2011-10-12 | 攀钢集团有限公司 | Method for accurately adjusting air knife for controlling galvanized layer thickness |
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