CN-122007183-A - Hot continuous rolling layer cold spray water flow online detection and automatic correction control method

CN122007183ACN 122007183 ACN122007183 ACN 122007183ACN-122007183-A

Abstract

The invention belongs to the technical field of ferrous metallurgy, and provides a hot continuous rolling layer cold spray water flow online detection and automatic correction control method, wherein an execution state closed loop is additionally arranged on the basis of a traditional temperature feedback closed loop, the actual spray state of a layer cold region is compared with a cooling model point by point, the set water flow state and the actual measured water flow state are utilized to calculate difference and form a normalization index, and when the index exceeds a threshold value, a control action is automatically triggered; the method forms a double-closed-loop control system of a temperature result closed loop and an execution state closed loop, obviously improves the layer cooling control precision, the response speed and the robustness, reduces the energy consumption and the manual intervention, ensures the consistency of the strip steel coiling temperature and the product quality, and has wide industrial popularization value.

Inventors

BAI WENYAN
WU TIANYU
WANG YING
LI CAIYU

Assignees

山西太钢不锈钢股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260119

Claims (6)

1. The hot continuous rolling layer cold spray water flow on-line detection and automatic correction control method is characterized by comprising the following steps: S1, arranging a temperature acquisition device at multiple points in a layer cooling area from an outlet of a finishing mill frame to the front of a coiling machine, and arranging a laser diffuse reflection light curtain sensor on the side surface of a water outlet chamber of each layer cooling pipe; S2, collecting the surface temperature of the strip steel, the diffuse reflection light curtain signals of the laser and the technological parameters to form a complete real-time data set; S3, calculating and comparing the surface temperature deviation delta T (x, T) of the strip steel with the empty setting index AI (T) of spraying through a layer cooling model built based on heat transfer science and cooling characteristics and arranged in the control system, and monitoring the setting state and actual execution of spraying; the empty setting index AI (t) of the spray is normalized by the difference of all sprays: wherein, N is the number of nozzles, di (t) is the spray state difference: Sset, i (t) are preset spray water flow states, smeas, i (t) are detected nozzle water flow states, and Sset, i (t) and Smeas, i (t) can take 0/1 to represent a switch state; s4, triggering a fault valve to perform secondary setting when the detected temperature deviation exceeds a threshold value or the idle setting index exceeds the threshold value; s5, carrying out regression analysis on the historical data regularly, wherein a calculation formula for automatically correcting the model parameter theta is as follows:
2. Where L is the loss function between the predicted temperature Tred and the measured temperature Tmeas, and η is the learning rate.
3. The method for on-line detection and automatic correction control of hot continuous rolling layer cold spray water flow according to claim 1, wherein the temperature acquisition device adopts three groups of infrared scanning thermometers which are respectively arranged at an inlet, a middle and an outlet of a layer cold area, and the range covers the full width of strip steel and acquires the surface temperature at a frequency of more than 10 Hz.
4. The online detection and automatic correction control method for hot continuous rolling layer cold spray water flow according to claim 1, wherein the logic of the secondary setting of the fault valve in S4 is as follows: s41, calculating a correction control amount, wherein the calculation formula is as follows: Wherein u i (t) is the control quantity after the i-th partition correction, and k T ,k S is the adjustment coefficient; s42, rapidly increasing water flow according to the corrected control quantity to carry out supplementary spraying.
5. The method for online detection and automatic correction control of hot continuous rolling layer cold spray water flow according to claim 3, wherein the method for rapidly increasing water flow comprises adjusting the opening of a valve or increasing spray.
6. The method for online detection and automatic correction control of hot continuous rolling layer cold spray water flow according to claim 1, wherein the control system displays a fault header or spray state on a visual interface and gives an alarm prompt.

Description

Hot continuous rolling layer cold spray water flow online detection and automatic correction control method Technical Field The invention belongs to the technical field of ferrous metallurgy, relates to intelligent management of a temperature control and spray system of a finish rolling rack outlet layer cold area of a hot continuous rolling coil production line, and particularly relates to an online detection and automatic correction control method of hot continuous rolling layer cold spray water flow. Background Hot continuous rolling is a core process link for producing high-quality plate and strip materials in the current steel enterprises, wherein the layering cooling process from the outlet of a finish rolling frame to the coiling process plays a vital role in strip steel organization, mechanical property and flatness. The traditional laminar cooling control mainly adjusts the water quantity, the nozzle opening and the strip steel speed of each partition through a preset cooling model and temperature feedback, and can realize coiling temperature control to a certain extent, but under complex working conditions such as high speed, multi-variety switching, ultra-wide specification, high-strength steel production and the like, the phenomenon that the set spraying is inconsistent with the actual spraying (namely 'blank setting') often occurs, so that the deviation of a cooling curve, the fluctuation of product performance and the energy waste are caused. In actual operation of the conventional layer cooling control system, various potential fault sources exist in the layer cooling spray system, such as damage to the layer cooling water valve body, burning of a coil or an electromagnetic wire, aging or breaking of a control circuit, insufficient air source pressure, blockage or uneven distribution of nozzles and the like. When such a fault occurs, the automation system still outputs a spraying instruction according to the cooling model, but cannot acquire the actual water spraying state of the nozzle or the water outlet chamber in real time. In other words, existing automation controls only "command" and cannot "see execution", resulting in the ubiquitous phenomenon of "empty settings" where settings do not coincide with actual ones. The cooling curve and the coiling temperature are thus shifted, the strip structure and performance fluctuation are increased, and the energy and water resources are also consumed inefficiently. The existing system indirectly deduces abnormal spraying by depending on temperature deviation, and has obvious hysteresis. Once a local valve or nozzle fails, a certain time and distance are needed for a temperature sensor to reflect the deviation, and the deviation is often found after the strip steel passes through a key cooling area, so that the water quantity cannot be adjusted in time in the process or the standby spray is switched. This not only reduces the control accuracy, but also increases the frequency of manual intervention and maintenance costs. Meanwhile, the existing alarm modes are mostly centralized or total alarm, so that the fault valves or the collecting pipes are difficult to accurately position in time, operation and maintenance personnel need to check one by one on site, and the production beat is delayed. In addition, the existing temperature measuring device is arranged at the inlet or the outlet of the layer cooling area, the spraying state cannot be directly observed, and the actual working conditions of the spraying valve and the spraying nozzle lack visualization and real-time feedback. Even if some flow meters or pressure meters are introduced, they are often in zones or gross levels and there is no direct evidence at the nozzles. Disclosure of Invention The invention aims to provide an online detection and automatic correction control method for hot continuous rolling layer cold spray water flow, which can judge whether spraying is executed according to a setting, compare an execution result with a cooling model setting, automatically supplement spraying or switch standby spraying, and fundamentally solve the problems that an automatic instruction is inconsistent with actual execution and a process cannot be automatically adjusted. The technical scheme adopted by the invention for achieving the purpose is as follows: A hot continuous rolling layer cold spray water flow on-line detection and automatic correction control method comprises the following steps: s1, arranging temperature acquisition devices at multiple points in a layer cooling area, and arranging laser diffuse reflection light curtain sensors on the side surface of a water outlet chamber of each layer cooling pipe; S2, collecting the surface temperature of the strip steel, the diffuse reflection light curtain signals of the laser and the technological parameters to form a complete real-time data set; S3, calculating and comparing the surface temperature deviation delta T (x, T) of the strip s