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Galvanized steel strip surface passivation film weight control system and control method thereof

A technology of control system and galvanized steel strip, applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve problems such as poor adjustment accuracy, lagging adjustment process, poor film weight control effect, etc.

Pending Publication Date: 2021-07-06
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the passivation film weight is controlled by a film thickness meter or a fluorescence analyzer, and the film weight is manually adjusted. The adjustment process lags behind, and the adjustment accuracy is poor, resulting in poor film weight control effect.

Method used

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  • Galvanized steel strip surface passivation film weight control system and control method thereof
  • Galvanized steel strip surface passivation film weight control system and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Its control system includes two parts: roller coater system and online film thickness meter system, and its specific composition, structure and function are as mentioned above.

[0067] When the unit is producing the ordinary chromium-free passivation environmental protection product DX51D, the production line speed is 90m / min, and the passivation film weight is set at 1.0g / m 2 , the parameters given by the second level are used for the initial input, such as the second-level parameters, the pressure between the reclaiming roll and the coating roll is 2500N, the pressure between the coating roll and the strip is 2500N, and the speed difference between the reclaiming roll and the coating roll is -15% , The pressure range of coating roller and strip steel, reclaiming roller and coating roller in the control program is set to 300 ~ 8000N.

[0068] After the roller coating is input according to the second-level given parameters, the online film thickness meter will continuo...

Embodiment 2

[0072] The difference with Embodiment 1 is:

[0073] The roller coating controller has calculated and adjusted the pressure between the coating roller and the strip to the minimum of 300N, and the passivation film weight still does not meet the standard requirements. The controller then starts the pressure program of the reclaiming roller and coating roller, and the roller coating controller The pressure between the take-up roller, the coating roller and the steel strip is 2000N, and the average weight of the film within a continuous range of 100m after adjustment is 1.08g / m 2 , meeting the standard range, the roller coating parameters are maintained.

[0074] Others are the same as in Embodiment 1.

Embodiment 3

[0076] The difference with Embodiment 1 is:

[0077] The online film thickness meter detects that there is a deviation between the weight of the lower surface film and the weight of the upper surface film. The controller of the roller coater can independently adjust the pressure of the upper and lower gauges of the coating roller and the strip, and the reclaiming roller and the coating roller. For example, the pressure on the lower gauge of the coating roller and the strip is 2000N, and the upper gauge pressure of the coating roller and the strip is 1800N. After the adjustment is completed, the test result of the online film thickness meter is 1.12g / m 2 ,fulfill the standard.

[0078] Others are the same as in Embodiment 1.

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Abstract

The invention discloses a galvanized steel strip surface passivation film weight control system which comprises a roller coater and a film thickness gauge. The control system is provided with four strip steel turning rollers, strip steel running on the horizontal plane is turned into a frame protruding upwards, the roller coater is arranged on the front side face of the frame, and the film thickness gauge is arranged on the rear side face of the frame. The invention further discloses a control method of the control system. By adopting the technical scheme, the film weight adjustment is more stable and timely, the lag of manual detection and adjustment is avoided, the film weight control precision is higher, the accurate control of the passive film weight is realized, the inconsistent judgment change amount of the passive film weight is reduced, and the quality loss is reduced; then, waste of a passivation solution caused by too high film weight is avoided, and the purposes of reducing cost and improving efficiency are achieved; and the automation rate of the production process is further improved, and human resources are optimized.

Description

technical field [0001] The invention belongs to the technical field of hot-dip galvanizing passivation process equipment on the surface of steel strips. Specifically, the present invention relates to a control system for passive film weight on the surface of galvanized steel strip. The invention also relates to a control method of the control system. Background technique [0002] After hot-dip galvanizing, the surface quality and corrosion resistance of cold-rolled steel strips will be significantly improved. As customers have higher and higher requirements for corrosion resistance, some galvanized steel strips will be further passivated. The most commonly used passivation process at present is the roller coating process. The passivation solution is coated on the surface of the strip steel through the take-up roller and the coating roller, so as to obtain a uniform organic or inorganic passivation that can prevent the oxidation of the strip surface. layer, thereby improvin...

Claims

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Application Information

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IPC IPC(8): C23C22/77C23C2/26C23C2/40C23C2/06
CPCC23C22/77C23C2/26C23C2/40C23C2/06
Inventor 周红兵姚鑫刘茂林刘劼林海章一樊李贤强李德超
Owner MAANSHAN IRON & STEEL CO LTD
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