Surface purging control method of hot-rolled low-temperature coiled strip based on water area

Abstract

The invention relates to the field of band steel surface purging, in particular to a hot rolling low-temperature reeling band steel surface purging control method. The hot rolling low-temperature reeling band steel surface purging control method based on a water area comprises the steps that nozzles of a surface purification device are divided into a plurality of groups, air supply lines of each group of the nozzles are controlled to be opened and closed by a purging controller, an image device is arranged between a laminar flow cooling device and the surface purification device, then a waterarea percentage and purging strength database is established, and the image device obtains a surface image of band steel; an image analysis device obtains the water area percentage through the surfaceimage; and a controller controls the nozzles according to the water area percentage. The purging strength is controlled through the residual water area, the current situation of invalid purging of alarge amount of compressed air in the purging process is avoided, while the purification effect on the upper surface of the laminar flow cooling band steel is ensured, huge waste of energy sources canbe greatly avoided, the energy source consumption in the production process is reduced, and the target of cost decreasing and benefit increasing on site is realized.

Description

technical field [0001] The invention relates to the field of strip surface purging, in particular to a method for controlling the surface purging of a hot-rolled low-temperature coiled strip. Background technique [0002] Such as figure 1 As shown, the coiling process of the existing hot-rolled low-temperature strip steel is that the strip steel 1 passes through the finishing stand 2, the laminar flow cooling device 3, the surface cleaning device 4, the temperature measuring device 5 and the coiling device 6 in sequence. After the steel 1 is washed by the surface purification device 4, there will be residual water. These residual water will affect the temperature measurement accuracy and temperature measurement success rate of the temperature measurement device 5, and the temperature is an important indicator affecting the final quality of the strip steel structure. Therefore A surface purification device 4 is provided to purge the strip 1, and the nozzle of the surface pur...

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Problems solved by technology

[0003] When the existing surface cleaning device is applied to the hot-rolled laminar flow area, considering the safety factor and avoiding the occurrence of scrap steel, there is usually a certain distance between the nozzle and the strip, and the hot-rolled low-temperature strip In the purge section, the temperature of the strip steel is usually below 500°C, and the purge air flow from the nozzle decays rapidly with the distance. In order to achieve a certain purge effect, a large air flow is required, which greatly increases the energy consumption of the purge. Therefore, it is necessary to A method that can precisely control the amount of purge to reduce energy consumption and meet the needs of energy saving

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