CN-121974548-A - Float glass product quality optimization method, system, medium and product

CN121974548ACN 121974548 ACN121974548 ACN 121974548ACN-121974548-A

Abstract

The application provides a float glass product quality optimization method, a float glass product quality optimization system, a float glass product quality optimization medium and a float glass product, and relates to the technical field of automatic control. The method comprises the steps of comparing a real-time transverse thickness distribution curve with a standard datum line to screen an abnormal region, tracing and positioning a target thermal control partition and a component according to a drawing speed, generating a mechanical drawing and temperature adjusting instruction based on the thickness exceeding amount, executing mechanical drawing and synchronously heating when the temperature of molten tin does not reach the standard, and dynamically adjusting the difference between the drawing speed and the glass flow rate according to the temperature approaching degree in the process until the temperature reaches the standard and recovering synchronous operation of a edge drawing machine. The process eliminates the dead zone without response in the traditional single temperature control mode, avoids long-distance waste bands generated by waiting for temperature rise, and improves the extremely short-term response speed and long-term steady-state control precision of the float glass forming process.

Inventors

GUO ZONGHUA
DING RUI
HOU YINGNAN
XIE TIANTIAN
LIU YAN

Assignees

中建材佳星玻璃(黑龙江)有限公司

Dates

Publication Date: 20260505
Application Date: 20251230

Claims (10)

1. The float glass product quality optimization method is applied to a glass quality optimization system, the system at least comprises a plurality of thermal control subareas which are distributed in sequence according to the glass flow direction, a heating assembly and an edge drawing machine assembly are arranged in each thermal control subarea, and an outlet end of the system is provided with an online thickness measuring device, and the method is characterized by comprising the following steps: acquiring a transverse thickness distribution curve output by the online thickness measuring device in real time; Comparing the transverse thickness distribution curve with a preset standard thickness datum line, and screening out an abnormal thickness region with a thickness value exceeding an allowable deviation range; According to the drawing speed of the glass ribbon, tracing and positioning to a target thermal control zone generating the abnormal thickness zone, and determining a target heating component and a target edge drawing machine component in the target thermal control zone; for the target thermal control partition, generating a mechanical stretching instruction containing stretching operation parameters and a temperature regulation instruction containing target temperature respectively based on the thickness deviation of the abnormal thickness region; acquiring the actual temperature of the molten tin in the target thermal control zone; when the actual temperature is not matched with the target temperature, executing the mechanical stretching instruction, and adjusting the stretching operation parameters of the target edge roller assembly; synchronously executing the temperature regulation instruction, and regulating the target heating component to approach the target temperature according to a preset rate; And in the process of executing the temperature regulation instruction, regulating a speed difference value between the stretching speed and the glass flow rate in the stretching operation parameter according to the approaching degree of the actual temperature and the target temperature, and recovering the target edge drawing machine assembly to a synchronous operation state with the glass ribbon until the actual temperature reaches the standard.
2. The method of claim 1, wherein the step of retrospectively locating the target thermal zone that created the abnormal thickness zone based on the draw speed of the glass ribbon and determining the target heating assembly and the target edge puller assembly in the target thermal zone comprises: Acquiring physical distances between an on-line thickness measuring device and each thermal control partition on a glass transmission path; Calculating the process transfer lag time required by the glass ribbon flowing from each thermal control subarea to the online thickness measuring device according to the current drawing speed of the glass ribbon and the physical distance data; taking the detection time of the online thickness measuring device as a reference, and retrospectively deducting the process transfer lag time to calculate the historical forming time of each thermal control partition; analyzing the longitudinal extension characteristic and the transverse offset position of the abnormal thickness region based on the transverse thickness distribution curve; Judging a forming process stage to which the abnormal thickness region belongs according to the longitudinal extension characteristics, and taking a corresponding historical forming time as a time sequence reference standard, and screening a thermal control partition matched with the forming process stage from all thermal control partitions to serve as a target thermal control partition; and in the target thermal control subarea, selecting one heating component and one edge roller assembly corresponding to the same side position according to the transverse offset position, and respectively determining the heating component and the edge roller assembly as the target heating component and the target edge roller assembly.
3. The method according to claim 1, wherein the step of generating a mechanical stretching instruction including a stretching operation parameter and a temperature adjustment instruction including a target temperature, respectively, based on the thickness variation amount of the abnormal thickness region, for the target thermal control zone, specifically comprises: a preset thickness correction-temperature change compensation mapping relation is called, and a corresponding temperature adjustment compensation value is calculated according to the thickness deviation amount; The temperature adjustment compensation value is added to the actual temperature to obtain the target temperature, and the temperature adjustment instruction is generated; Obtaining the main transmission speed of the production line as a reference value, determining and obtaining a linear speed adjustment amount according to the thickness deviation amount and the thickness correction-speed compensation mapping relation, and generating the mechanical stretching instruction by combining the reference value: when the thickness exceeding amount indicates that the thickness of the glass ribbon exceeds the upper limit, setting the linear speed of the target edge drawing machine to be higher than the reference value, and applying a stretching force along the flow direction to the glass liquid by utilizing the speed difference to thin; and when the thickness exceeding amount indicates that the thickness of the glass ribbon exceeds the lower limit, setting the linear speed of the target edge roller to be lower than the reference value so as to thicken the extrusion accumulation formed by physical blocking of the glass liquid.
4. A method according to claim 3, wherein the step of generating the mechanical stretching instructions in combination with the reference value further comprises: Based on the thickness exceeding amount, estimating transverse shrinkage stress of the glass ribbon caused by executing the linear speed adjusting amount; calculating a deflection angle compensation value for generating a counteracting component force according to the transverse shrinkage stress; And adding the deflection angle compensation value to the mechanical stretching instruction to instruct the target edge roller assembly to synchronously adjust the swinging angle of the machine head when the linear speed adjustment is performed.
5. The method according to claim 1, wherein the step of adjusting the speed difference between the drawing speed and the glass flow rate in the drawing operation parameter according to the approaching degree of the actual temperature and the target temperature in the process of executing the temperature adjustment command comprises the steps of calling a preset temperature-speed sensitivity correlation model, wherein the model records the linear speed adjustment quantity of the edge roller equivalently replaced by the unit temperature change quantity in different temperature intervals; Calculating the temperature completion degree of the actual temperature relative to the target temperature in real time; Matching a corresponding current sensitivity coefficient from the temperature-speed sensitivity correlation model based on a current actual temperature; and calculating a speed compensation value to be cancelled according to the temperature completion degree and the current sensitivity coefficient, and subtracting the speed compensation value to be cancelled from the current stretching operation parameter.
6. A method according to claim 3, characterized in that after the step of generating the mechanical stretching instructions in combination with the reference value, it further comprises: judging whether the linear speed adjustment quantity exceeds a preset single machine safety adjustment threshold value or not; if so, determining that performance by the single target edge puller assembly will result in glass ribbon edge stress concentration; defining the part exceeding the single machine safety adjustment threshold as overflow adjustment quantity; And when the target edge pulling machine assembly executes the action corresponding to the single machine safety adjustment threshold, the overflow adjustment quantity is distributed to adjacent auxiliary edge pulling machine assemblies at the upstream and downstream of the target edge pulling machine assembly according to a decreasing proportion, and an auxiliary cooperative instruction is generated.
7. The method of claim 3, wherein during execution of the temperature adjustment command, adjusting a speed difference between the drawing speed and the glass flow rate in the drawing operation parameter according to a degree of proximity between an actual temperature and a target temperature until the actual temperature reaches a standard, and after the step of returning the target edge drawing machine assembly to a state of synchronous operation with the glass ribbon, further comprising: Determining a final residual thickness deviation of the new glass ribbon after the new glass ribbon flows through the online thickness measuring device; judging whether the final residual thickness deviation still exceeds an allowable deviation range; If the thickness of the object is larger than the preset thickness correction value, indicating that model mismatch exists in the preset thickness correction-temperature change compensation mapping relation; calculating a model correction coefficient according to the proportional relation between the final residual thickness deviation and the initial thickness deviation; and updating the preset thickness correction-temperature change compensation mapping relation by using the model correction coefficient.
8. A glass quality optimization system comprising one or more processors and memory coupled to the one or more processors, the memory to store computer program code comprising computer instructions that the one or more processors invoke to cause the glass quality optimization system to perform the method of any of claims 1-7.
9. A computer readable storage medium comprising instructions that, when run on a glass quality optimization system, cause the glass quality optimization system to perform the method of any of claims 1-7.
10. A computer program product comprising a computer program which, when run on a glass quality optimization system, causes the glass quality optimization system to perform the method of any of claims 1-7.

Description

Float glass product quality optimization method, system, medium and product Technical Field The application relates to the technical field of automatic control, in particular to a float glass product quality optimization method, a float glass product quality optimization system, a float glass product quality optimization medium and a float glass product. Background The float glass forming process is a process of floating molten glass on the surface of molten tin and flattening and stretching the molten glass into a glass ribbon with a specific thickness by utilizing the gravity, the surface tension and the mechanical tension of a selvedge-drawing machine. The tin bath is a core area for determining the final flatness and thickness uniformity of glass, and the complex temperature field and flow field in the tin bath directly determine the forming quality. The traditional method is to compare the actual thickness of the glass ribbon detected on line with the target thickness by a system to obtain a thickness deviation value. When the local thickness of the glass ribbon is detected to exceed the standard (become thicker), the controller calculates the required temperature compensation amount according to the deviation value, and outputs an instruction to increase the heating power of the corresponding temperature zone. However, due to the large heat capacity of the tin bath, temperature regulation has a very large thermal inertia hysteresis. When the thickness gauge finds thickness deviation and instructs the heater to heat, the tin liquid and the shielding gas take several minutes to reach the set temperature, and further, the glass viscosity is changed and time is needed. In this lengthy response period, a ribbon of glass tens of meters long has already flowed through the forming zone. The control action is always slow and half-beat, the current thickness defect cannot be repaired, the delayed temperature rise can cause the follow-up original normal glass segment to be too thin, so that the oscillation of thickness parameters is caused, and the high-precision quality steady-state control cannot be realized. Disclosure of Invention The application provides a float glass product quality optimization method, a system, a medium and a product, which are used for solving the problem of thickness adjustment response lag caused by large thermal inertia of a tin bath in the float glass forming process and realizing rapid real-time compensation and high-precision steady-state repair of a glass belt thickness abnormal region. According to the drawing speed of a glass ribbon, the target heating component and the target edge drawing component in the target thermal control partition are located in a tracing mode, a mechanical drawing instruction containing a drawing operation parameter and a temperature regulation instruction containing a target temperature are respectively generated according to the thickness exceeding amount of the target thermal control partition, the actual temperature of tin liquid in the target thermal control partition is acquired, the mechanical drawing instruction is executed when the actual temperature does not match with the target temperature, the target edge drawing component is adjusted, the drawing speed of the target edge drawing component is adjusted to be close to the target temperature regulation instruction in a synchronous mode with the actual temperature regulation speed of the target temperature regulation component, and the drawing speed is adjusted to be in a synchronous mode with the target temperature regulation speed of the target temperature regulation component according to the synchronous operation speed of the target temperature regulation component when the actual temperature does not match with the target temperature, and the drawing speed of the target temperature regulation component is adjusted to be synchronous with the target temperature regulation instruction. By adopting the technical scheme, the control hysteresis problem caused by the huge thermal inertia of the tin bath is solved by utilizing the complementary characteristics of high response speed of mechanical action and strong fundamental thermal regulation. Specifically, at the moment of detecting thickness abnormality, the system preferably moves the edge roller assembly to perform mechanical stretching or blocking action, and immediately corrects the rheological state of the molten glass by using the physical stress generated by changing the pulling speed, and compensates the thickness deviation in advance in the thermal inertia hysteresis period. Along with the power increase of the heating component, the temperature of molten tin gradually approaches to the target value, the viscosity of glass is changed substantially, and at the moment, the system dynamically withdraws the mechanical intervention quantity, thereby realizing the seamless connection of two control means. The process not only eliminates th