Automatic control system for plating thickness of hot galvanizing line

An automatic control system and coating thickness technology, applied in hot-dip plating process, coating, metal material coating process, etc., can solve the problems of long adjustment time, excessive deviation of coating thickness, poor control effect, etc., to eliminate Effects of model mismatch error, elimination of coating thickness deviation, and elimination of long-term cumulative error in the system

Active Publication Date: 2013-02-06
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The system can realize automatic control of coating thickness, but the predictive control loop and feedback control loop are based on the model, the control performance is too dependent on the model accuracy, and the control effect is not good when the model is mismatched
[0007] At present, the coating t

Method used

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  • Automatic control system for plating thickness of hot galvanizing line
  • Automatic control system for plating thickness of hot galvanizing line
  • Automatic control system for plating thickness of hot galvanizing line

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Embodiment Construction

[0025] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0026] For a hot-dip galvanizing line in China, the distance between the thickness gauge and the air knife is 150 meters, and the running speed is 50-150 meters per minute. 6 common plating thickness specifications 80, 100, 120, 180, 220, 275g / m 2 .

[0027] 1. System configuration.

[0028] The air knife from FOEN Company in Germany, the coating thickness gauge from THERMO Company in the United States are selected, the S7-300PLC controller from SIEMENS Company is selected as the air knife controller, and the IPC427C embedded industrial PC from SIEMENS Company is selected as the industrial PC. Such as figure 1As shown, the PROFIBUS DP protocol is used for data communication between the PC and the PLC controller, the PC is used as the slave station, and the PLC controller is used as the master station. The PC side is equipped with CP5611 networ...

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Abstract

The invention provides an automatic control system for plating thickness of cold rolling hot galvanizing line, which comprises an air knife, a thickness gauge, an industrial PC (Personal Computer), a PLC (Programmable logic Controller) and a plating thickness control program, wherein the control program is run in the industrial PC; the industrial PC and the PLC controller are connected by using a PROFIBUS (Process Field Bus) DP field bus; the PLC controller acquires the actual value of plating thickness and data in production process and sends into the industrial PC; the control program adopts cascade control method; a minor loop is designed into a servo system by utilizing the advantages of conventional PID (Proportion Integration Differentiation) dense sampling; the sampling period of a major loop is 50-100 times of that of the minor loop; the control program calculates the setting values of air knife pressure, distance and frame position in real time according to the actual value of plating thickness and the data in production process and sends into the PLC controller so as to realize the adjustments of the air knife pressure, distance and frame position; and simultaneously, the controls for undisturbed switching and plating variable specification switching in manual/automatic mode are further designed. According to the automatic control system, the deviation of plating thickness can be quickly eliminated, and the system has good control effect on variable specification in the processes of accelerating and decelerating.

Description

technical field [0001] The invention belongs to the technical field of iron and steel production equipment, and is suitable for coating thickness control of a hot-dip galvanizing production line. Background technique [0002] Hot-dip galvanized sheets are widely used in construction, home appliances, automobiles and other industries due to their good corrosion resistance. In recent years, with the increasingly fierce competition in the hot-dip galvanized sheet market, users have higher and higher requirements for the quality of hot-dip galvanized sheets. The thickness and uniformity of the coating are an important indicator for evaluating the quality of galvanized sheets. Too thin a coating affects the corrosion resistance of the product, and too thick a coating affects the spot weldability and adhesion of the product and causes waste of zinc raw materials. At present, most domestic hot-dip galvanizing production lines still adopt the traditional control method for the cont...

Claims

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Application Information

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IPC IPC(8): C23C2/14C23C2/20
Inventor 秦大伟王军生张岩费静侯永刚宋君刘宝权吴萌王奎越柴明亮
Owner ANGANG STEEL CO LTD
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