A kind of automatic control method of continuous hot-dip galvanizing air knife distance
A hot-dip galvanizing and air-knife technology, applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problem of automatic control of knife distance without introduction, and achieve the effect of improved precision and accurate positioning
Active Publication Date: 2019-01-08
ANGANG STEEL CO LTD
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[0004] In the 24th issue of "China Metallurgy" in 2014, Liu Xiangguo published an article "The Composition and Function Analysis of the Air Knife Control System of Angang Steel Hot-dip Galvanizing Line". It is stated that the execution method of air knife distance control adopts the stepping control method, and it does not introduce the relevant content of automatic control of knife distance
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[0028] The present invention will be described in detail below in conjunction with the accompanying drawings, but it should be pointed out that the implementation of the present invention is not limited to the following embodiments.
[0029] This example is carried out in a continuous hot-dip galvanizing line production plant. The products of this production line are positioned as building home appliance panels and automotive panels. The production process adopts the improved Sendzimir method, and the annual output is about 800,000 tons. The air knife adopts German FOEN company, and the production line equipment, electrical and automatic control system adopts German SIEMENS company. The thickness range of galvanized layer is 80-276g / m 2 , the plate width is 1004 ~ 1256mm, and the strip speed range is 40 ~ 150m / min.
[0030] The specific implementation steps are as figure 2 :
[0031] Step 1, collect the coating target thickness 80-276g / m 2 The sample data within the range...
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Abstract
The invention relates to an automatic control method for the knife clearance of continuous hot dip galvanizing air knives. The automatic control of the knife clearance of the air knives is finally realized by adopting a comprehensive control method of the knife clearance presetting control of the air knives, the feed-forward control of the knife clearance of the air knives and the feedback control of the knife clearance of the air knives. The automatic control method has the advantages that after the method is applied to actual galvanizing production, the locating of the knife clearance of the air knives is accurate, the thickness precision of a plating is obviously improved by combining the pressure control of the air knives, and at the same time, the on-site manual operation of the knife clearance is replaced; and the risk that the air knives are close to a band steel when the band steel is in an arched state is reduced.
Description
technical field [0001] The invention relates to an automatic control method for continuous hot-dip galvanizing air knife distance. Background technique [0002] With the rapid development of the national economy, my country is vigorously developing automobiles, home appliances, energy and urban infrastructure, and the demand for hot-dip galvanized strip steel is also increasing, which puts forward higher requirements for the quality of hot-dip galvanized strip steel products. The air knife is one of the important process equipment of the hot-dip galvanizing unit, which is used to control the uniformity and stability of the thickness of the zinc layer. The quality of its control system directly affects the quality of the galvanized finished product. See figure 1 , after the strip steel substrate passes through the zinc pot through the oxidation-reduction action of the continuous annealing furnace, liquid zinc will be attached to its surface, and then the air knife on both si...
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IPC IPC(8): C23C2/20C23C2/06
CPCC23C2/06C23C2/20
Inventor 费静王军生张岩秦大伟曹忠华宋宝宇高冰侯永刚李志锋许寒冰
Owner ANGANG STEEL CO LTD