Method for tracking and controlling weld joints of band steel of continuous processing production line

Abstract

A method for tracking and controlling weld joints of band steel of a continuous processing production line is characterized in that the method is a control method combining dynamically compensating the length of band steel of a jumping roller in a furnace section with building a band steel expansion model in a zinc pot section to realize tracking and controlling welding joints in a process section. The length of the band steel of the jumping roller in the furnace section is dynamically compensated by means of adding the length, which is measured by a position sensor, of the band steel into the physical length of a preheating section (JPF) so that the weld joints are tracked and controlled; and an output factor is built according to the thickness of the band steel and a hot galvanizing process curve and is used as a variation value of the length of the band steel, and the variation value is added to the physical length of the zinc pot section so that the weld joints are tracked and controlled. Optimal tension switching moments of various sections of the furnace section are realized, proper tension is provided for the band steel, and accordingly a unit can produce qualified galvanized products. In addition, weld joint tracking control precision of the process section is greatly improved, the problem that the unit stops and is failed due to the fact that the band steel is collided with a baffle plate at the edge of an air knife when the weld joints pass through the air knife is completely avoided, and accordingly labor intensity of operators is greatly reduced.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular, the invention relates to a continuous processing production line strip welding seam tracking control technology and application, more specifically, a strip steel welding seam tracking control method for a process section of a hot-dip galvanizing unit in the cold rolling industry. Background technique [0002] In the field of metallurgy, the strip steel after cold rolling often has to be connected and welded in the length direction before entering the continuous treatment process section of the hot-dip galvanizing unit for continuous treatment. At this time, the tension control of each section of the strip in the length direction of the strip is very important. [0003] The process section equipment for continuous processing of the hot-dip galvanizing unit includes tensioning rolls, dancing rolls, preheating section, heating section, soaking section, slow cooling section, fast cooling sect...

AI Technical Summary

Problems solved by technology

[0005] 1. Due to the lack of consideration of the dynamic compensation amount of the strip length located on the movable jumping roller, the tension switching time of each section of the furnace cannot reach the best state, and the tension control of each section cannot meet the requirements of the existing process technology

[0006] 2. Since the strip weld tracking control technology in the furnace section does not take into account the thermal expansion and contraction of the strip steel in the furnace section, the weld tracking control accuracy of the strip steel in the furnace section is poor. In addition, the strip thickness variation range At 0.25-2.3MM, when the strip weld passes through the air knife, it is easy for the strip to collide with the edge baffle of the air knife, which will cause the unit to stop

[0007] 3. Due to the defects of the original strip weld seam tracking control technology, the non-contact control function of the air knife edge baffle cannot be put into use normally, and the operator can only use the contact air knife edge baffle function

In this way, when the edge baffle of the air knife is automatically opened, the operator needs to manually close the edge baffle according to the actual situation on site, thereby greatly enhancing the labor intensity of the operator, and it is also not conducive to the coating of the edge of the strip. layer quality control

Images