A method and system for monitoring the liquid level of molten glass in a furnace during substrate glass preparation.

Abstract

This invention discloses a method and system for monitoring the liquid glass level in a furnace during substrate glass preparation, belonging to the field of substrate glass manufacturing technology. It solves the technical problem that existing technologies cannot achieve real-time monitoring and adjustment of the liquid glass level in a substrate glass furnace to ensure its stability. The method involves collecting weighing data of glass powder and substrate glass, and calculating the theoretical height of the liquid glass level in the furnace. Subsequently, a glass volume conversion coefficient is set, and the actual liquid glass level is manually measured. The theoretical and actual liquid glass levels are compared to correct the volume conversion coefficients for melting glass powder and substrate glass. By comparing the difference between the theoretical and target liquid glass levels, the feeding frequency of the feeding system is adjusted, thereby achieving adjustment and stability of the liquid glass level in the substrate glass furnace.

Description

Technical Field

[0001] This invention belongs to the field of substrate glass manufacturing technology, specifically relating to a method and system for monitoring the liquid level of molten glass in a furnace during substrate glass preparation. Background Technology

[0002] Substrate glass is one of the important raw materials for LCD panels, and it has a huge impact on the performance of panel products. The resolution, light transmittance, thickness, weight, and viewing angle of the finished panel are all closely related to the quality of the substrate glass used.

[0003] In the production of substrate glass, a crucial factor affecting its quality is the stable control of the molten glass level in the furnace. Fluctuations in the molten glass level can lead to defects such as bubbles, streaks, bright lines, and particles in the substrate glass, reducing the production line's yield. Currently, most furnace liquid level measurements are performed using contact-type measuring tools and periodic manual measurements. This method suffers from measurement lag and cannot monitor changes in the furnace liquid level in real time. It also fails to allow for timely adjustments to the feeding frequency of the feeding machine to achieve stable control of the molten glass level, severely hindering production line operations and the rapid improvement of yield. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention aims to provide a method and system for monitoring the liquid level of molten glass in a furnace in a substrate glass preparation channel, which solves the technical problem that the prior art cannot achieve real-time monitoring and adjustment of the liquid level height of molten glass in a substrate glass furnace to ensure the stability of the liquid level of molten glass in the furnace.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] This invention discloses a method for monitoring the liquid level of molten glass in a furnace during substrate glass preparation. The substrate glass preparation line includes a feeding system connected to a furnace, a channel connected to the furnace, and a forming module connected to the channel. The feeding system is equipped with an online weighing system for furnace glass powder, and the forming module is connected to the online weighing system for substrate glass.

[0007] Includes the following steps:

[0008] S1: Within the same time frame, acquire the glass powder weighing data and substrate glass weighing data of the online weighing system for furnace glass powder and the online weighing system for substrate glass;

[0009] S2: Calculate the input weight of glass powder and the output amount of substrate glass channel based on the obtained glass powder weighing data and substrate glass weighing data, and set the volume conversion coefficient of glass powder melting into liquid glass and the volume conversion coefficient of substrate glass melting into liquid glass. Then calculate the liquid glass level height in the furnace to obtain the theoretical liquid glass level height.

[0010] S3: Then, the glass liquid level height in the furnace is measured to obtain the actual glass liquid level. The volume conversion coefficient of glass powder melting into glass liquid and the volume conversion coefficient of substrate glass melting into glass liquid are corrected by comparing the theoretical glass liquid level height and the actual glass liquid level height until the actual glass liquid level height and the theoretical glass liquid level height are consistent.

[0011] S4: By comparing the difference between the theoretical height of the molten glass level and the target height of the substrate glass during operation, the feeding frequency of the feeding system is adjusted to achieve monitoring and control of the molten glass level in the furnace.

[0012] Furthermore, assuming the same time period is T1 to T2, the glass powder weighing data includes the weight M2 of the hopper in the feeding system at time T1, the weight M3 of the hopper in the feeding system at time T2, the weight M1 of the glass powder added to the bag in the feeding system, and the weight M0 of the hopper itself in the feeding system.

[0013] Furthermore, the weight of the glass powder input is set as M. 投料 M 投料 =M2-M3+M1-M0.

[0014] Furthermore, assuming the same time period is T1 to T2, the substrate glass weighing data includes the weight M4 of each substrate glass and the number N of substrate glass pieces during the time period T1 to T2.

[0015] Furthermore, the amount of glass channel lead-out on the substrate is set to M. 引 M 引 =M4N.

[0016] Furthermore, the theoretical height of the molten glass level is set as H;

[0017]

[0018] Where H0 is the initial height of the molten glass level in the furnace, in mm; ρ1 is the density of the glass powder, in g / mm³. 3 ρ2 is the density of the substrate glass, in g / mm². 3γ1 is the volume conversion coefficient of glass powder melting into molten glass; γ2 is the volume conversion coefficient of substrate glass melting into molten glass; L is the length inside the furnace, in mm; W is the width inside the furnace, in mm.

[0019] Furthermore, γ1 and γ2 are adjusted according to the actual height of the molten glass level obtained by manual measurement, thereby correcting the height of the molten glass level in the furnace.

[0020] Furthermore, the substrate glass preparation process also includes a target liquid level height, the difference between the theoretical liquid level and the target liquid level height is denoted as δ, and a threshold value is set as δ. 阈值 If |δ| is less than or equal to δ 阈值 If the liquid glass level in the furnace meets the requirements, then |δ| is greater than δ. 阈值 If the glass melt level in the furnace does not meet the requirements, it is necessary to adjust the glass melt level in the furnace.

[0021] If |δ| is greater than δ 阈值 When δ is positive, it indicates that the liquid glass level in the furnace is higher than the target level. Therefore, the liquid glass level in the furnace can be made to meet the requirement by reducing the feeding frequency of the feeding system. If |δ| is greater than δ... 阈值 When δ is negative, it indicates that the liquid level of the molten glass in the furnace is lower than the target liquid level. Therefore, the liquid level of the molten glass in the furnace can be made to meet the requirements by increasing the feeding frequency of the feeding system.

[0022] Furthermore, in order to ensure that the glass melt level in the furnace meets the requirements, the feeding frequency of the feeding system is set to P;

[0023]

[0024] Where P0 is the operating frequency of the feeder in the feeding system before adjustment, in units of n / min; P e The rated frequency of the feeder in the feeding system, expressed in n / min; m e δ represents the weight of glass powder that the feeder in the feeding system can feed at the rated frequency, in grams; δ is the difference between the theoretical height and the target height of the molten glass, in millimeters; and T is the time it takes for the molten glass in the furnace to reach the target height.

[0025] This invention also discloses a method for monitoring the liquid level of molten glass in a furnace using the above-mentioned substrate glass preparation channel, comprising:

[0026] The data acquisition unit is configured to acquire glass powder weighing data and substrate glass weighing data from the online weighing system for furnace glass powder and the online weighing system for substrate glass.

[0027] The data processing unit is configured to calculate the input weight of glass powder and the output amount of the substrate glass channel based on the acquired glass powder weighing data and substrate glass weighing data, and to set the volume conversion coefficient of glass powder melting into liquid glass and the volume conversion coefficient of substrate glass melting into liquid glass. Then, the liquid glass level height in the furnace is calculated to obtain the theoretical height of the liquid glass level.

[0028] The parameter calibration unit is configured to compare the actual height of the molten glass level obtained by manually measuring the molten glass level in the furnace with the theoretical height of the molten glass level, and to correct the volume conversion coefficient of glass powder melting into molten glass and the volume conversion coefficient of substrate glass melting into molten glass until the actual height of the molten glass level and the theoretical height of the molten glass level are consistent.

[0029] The liquid level control unit adjusts the feeding frequency of the feeding system by comparing the difference between the theoretical height of the molten glass and the target liquid level height set during the substrate glass preparation process, thereby achieving monitoring and control of the molten glass level height in the furnace.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] This invention discloses a method for monitoring the liquid glass level in a furnace of a substrate glass preparation channel. By collecting weighing data of glass powder and substrate glass, the method obtains the input weight of glass powder and the amount of substrate glass exiting the channel, and calculates the theoretical height of the liquid glass level in the furnace. Subsequently, it sets the volume conversion coefficients for glass powder melting into liquid glass and for substrate glass melting into liquid glass. By manually measuring the actual liquid glass level, it compares the theoretical and actual levels to correct these conversion coefficients. Finally, by comparing the difference between the theoretical liquid glass level and the target level set during substrate glass preparation, it adjusts the feeding frequency of the feeding system to achieve adjustment and stability of the liquid glass level in the substrate glass furnace. It enables real-time monitoring and adjustment of the molten glass level in the substrate glass furnace, ensuring the stability of the molten glass level and overcoming the shortcomings of existing monitoring methods that cannot perform real-time monitoring. It can effectively control the fluctuation of the molten glass draw-out volume and solve the defects such as bubbles, streaks, bright lines and particles caused by the fluctuation of the molten glass level in the furnace.

[0032] The present invention also discloses a furnace glass melt level monitoring system for a substrate glass preparation channel using the above-mentioned furnace glass melt level monitoring method. The system can realize real-time monitoring and adjustment of the furnace glass melt level height through the cooperation of a data acquisition unit, a data processing unit, a parameter calibration unit, and a level control unit. At the same time, it solves the problems of defects such as bubbles, streaks, bright lines, and particles caused by furnace glass melt level fluctuations in the substrate glass. Attached Figure Description

[0033] Figure 1 This is a flowchart of the method for monitoring the liquid level of molten glass in the furnace in the substrate glass preparation channel of the present invention.

[0034] Figure 2 This is a schematic diagram of the production line for preparing the substrate glass of the present invention;

[0035] Among them: 1-feeding system; 2-kiln; 3-channel; 4-forming module; 5-online weighing system for substrate glass. Detailed Implementation

[0036] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0037] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0038] The present invention will now be described in further detail with reference to the accompanying drawings:

[0039] like Figure 1 and Figure 2As shown, the substrate glass preparation channel includes a feeding system 1, which is equipped with an online weighing system for furnace glass powder. The feeding system 1 also has a hopper, into which glass powder is added via a material bag. The feeding system is connected to a furnace 2, which is connected to a forming module 4 via a channel 3. The forming module 4 processes the molten glass to obtain the substrate glass. An online weighing system 5 for substrate glass is connected to the rear end of the glass cross-cutting device of the forming module 4.

[0040] This invention discloses a method for monitoring the liquid level of molten glass in a furnace during substrate glass preparation, comprising the following steps:

[0041] Step 1: Using a data acquisition unit, acquire the glass powder weighing data and substrate glass weighing data of the furnace glass powder online weighing system and the substrate glass online weighing system 5 within the time interval T1 to T2. The glass powder weighing data includes the weight M2 of the hopper in the feeding system 1 at time T1, the weight M3 of the hopper in the feeding system 1 at time T2, the weight M1 of the glass powder added to the bag in the feeding system 1, and the weight M0 of the hopper itself in the feeding system 1. The substrate glass weighing data includes the weight M4 of each substrate glass and the number N of substrate glass sheets within the time interval T1 to T2.

[0042] Step 2: Using a data processing unit, calculate the glass powder weighing data and substrate glass weighing data obtained in Step 1 to obtain the input weight M of glass powder during the time period T1 to T2. 投料 M 投料 =M2-M3-M1-M0 and substrate glass channel lead-out amount M 引 M 引 =M4N, and set the volume conversion coefficient γ1 for melting glass powder into liquid glass and the volume conversion coefficient γ2 for melting substrate glass into liquid glass. Then calculate the liquid glass level height in furnace 2 to obtain the theoretical liquid glass level height H.

[0043] The

[0044] Where H0 is the initial height of the molten glass level in furnace 2, in mm; ρ1 is the density of the glass powder, in g / mm³. 3 ρ2 is the density of the substrate glass, in g / mm². 3 L is the length of the substrate glass, in mm; W is the width of the substrate glass, in mm.

[0045] Step 3: Then, manually measure the glass melt level in furnace 2 to obtain the actual glass melt level. Compare the theoretical glass melt level H with the actual glass melt level to correct the volume conversion coefficient γ1 of glass powder melting into glass melt and the volume conversion coefficient γ2 of substrate glass melting into glass melt until the actual glass melt level and the theoretical glass melt level H are consistent.

[0046] Step 4: By comparing the difference δ between the theoretical height of the molten glass level and the target height of the substrate glass during the manufacturing process, a threshold value is set as δ. 阈值 If |δ| is less than or equal to δ 阈值 If the liquid glass level in furnace 2 meets the requirements, then |δ| is greater than δ 阈值 If the glass melt level in furnace 2 does not meet the requirements, the glass melt level in furnace 2 needs to be adjusted.

[0047] If |δ| is greater than δ 阈值 When δ is positive, it indicates that the liquid glass level in furnace 2 is higher than the target level. Therefore, the liquid glass level in furnace 2 can be made to meet the requirement by reducing the feeding frequency of the feeding system. If |δ| is greater than δ... 阈值 When δ is negative, it indicates that the liquid level of the molten glass in furnace 2 is lower than the target liquid level. Therefore, the liquid level of the molten glass in furnace 2 can be made to meet the requirements by increasing the feeding frequency of the feeding system.

[0048] The feeding frequency P of the feeding system was then calculated.

[0049]

[0050] Where P0 is the operating frequency of the feeder in feeding system 1 before adjustment, in units of n / min; P e The rated frequency of the feeder in feeding system 1 is expressed in n / min; m e δ represents the weight of glass powder that the feeder in feeding system 1 can feed at the rated frequency, in grams; δ represents the difference between the theoretical height of the molten glass and the target height, in millimeters; and T represents the time it takes for the furnace liquid level to reach the target level.

[0051] Adjust the feeding frequency of the feeding system to achieve monitoring and control of the glass melt level in furnace 2.

[0052] Example 1

[0053] Assuming that between T1 and T2, at T1, 12:00, the weight M2 of the hopper in feeding system 1 is 615 kg, and at T2, 13:00, the weight M3 of the hopper in feeding system 1 is 1205 kg. The weight M1 of the glass powder added to the bag in feeding system 1 is 1600 kg, and the weight M0 of the hopper itself in feeding system 1 is 200 kg. Then, the input weight M of the glass powder is... 投料 for:

[0054] M 投料 =M2-M3+M1-M0=615-1205+1600-200=810kg;

[0055] Between T1 at 12:00 and T2 at 13:00, there were 115 substrate glass pieces. Weighing system 5 measured each substrate glass piece to be 6350g. Therefore, the amount of substrate glass channel outlet M... 引 for:

[0056] M 引 =M4N=(6350×115) / 1000=730kg;

[0057] The internal length L of furnace 2 is 5860 mm, the internal width of furnace 2 is 2340 mm, the initial height H0 of the molten glass level in furnace 2 is 960 mm, the target height is also 960 mm, and the density ρ1 of the glass powder is 1.2 g / mm³. 3 The density ρ2 of the substrate glass is 2.5 g / mm². 3 The volume conversion coefficient γ1 for melting glass powder into molten glass is 0.66; the volume conversion coefficient γ2 for melting substrate glass into molten glass is 1.53. Therefore, the theoretical height of the molten glass level is set as H.

[0058]

[0059] At this time, H = H0, indicating that the liquid level of the glass melt in furnace 2 is in a state of dynamic equilibrium.

[0060] When the glass melt level H0 in furnace 2 reaches 954 mm due to the increased extraction rate, and the target level is 960 mm, the difference δ between the theoretical glass melt level and the target level is calculated as follows:

[0061] δ = 954 - 960 = -6 mm;

[0062] Set δ 阈值 =2mm, |δ|=6mm, which is greater than δ 阈值If δ = 2mm and δ = -6mm is a negative value, it indicates that the liquid glass level in furnace 2 is lower than the target liquid level. Therefore, by increasing the feeding frequency of feeding system 1, the liquid glass level in furnace 2 can meet the requirements.

[0063] Assume the current feeding frequency P0 of feeding system 1 is 3n / min, and the rated frequency P e At a speed of 20 n / min, the weight of glass powder that can be dispensed at the rated frequency is m. e The glass melt volume is 90,000g. To ensure the required glass melt level in furnace 2 within 48 hours, the feeding frequency of feeding system 1 is set to P:

[0064]

[0065] That is, within a time period T of 48 hours, if the feeding frequency P of the material system 1 is set to 13.69 n / min, the liquid glass level in the furnace 2 will meet the requirements.

[0066] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A method for monitoring the liquid level of molten glass in a furnace during substrate glass preparation, characterized in that, The substrate glass preparation line includes a feeding system (1), which is connected to a furnace (2), which is connected to a channel (3), and the channel (3) is connected to a forming module (4); the feeding system (1) is equipped with an online weighing system for furnace glass powder, and the forming module (4) is connected to an online weighing system for substrate glass (5). Includes the following steps: S1: Within the same time frame, acquire the glass powder weighing data of the online weighing system for furnace glass powder and the substrate glass weighing data of the online weighing system for substrate glass (5); S2: Calculate the input weight of glass powder and the output of the substrate glass channel based on the obtained glass powder weighing data and substrate glass weighing data, and set the glass powder melting into liquid glass volume conversion coefficient and the substrate glass melting into liquid glass volume conversion coefficient. Then calculate the liquid glass level height in the furnace (2) to obtain the theoretical liquid glass level height. S3: Then measure the glass liquid level height in the kiln (2) to obtain the actual glass liquid level height. Compare the theoretical glass liquid level height and the actual glass liquid level height to correct the volume conversion coefficient of glass powder melting into glass liquid and the volume conversion coefficient of substrate glass melting into glass liquid until the actual glass liquid level height and the theoretical glass liquid level height are consistent. S4: By comparing the difference between the theoretical height of the molten glass level and the target height of the substrate glass preparation during operation, the feeding frequency of the feeding system is adjusted to achieve monitoring and control of the molten glass level in the furnace (2). Assuming the same time is T1 to T2, the glass powder weighing data includes the weight M2 of the hopper in the feeding system (1) at time T1, the weight M3 of the hopper in the feeding system (1) at time T2, the weight M1 of the glass powder added by the feeding system (1), and the weight M0 of the hopper itself in the feeding system (1). Assuming the same time period is T1 to T2, the substrate glass weighing data includes the weight M4 of each substrate glass and the number N of substrate glass sheets during the time period T1 to T2; the substrate glass channel lead-out amount is set to M. 引 M 引 =M4N; The theoretical height of the molten glass level is set as H; ； Where H0 is the initial height of the molten glass level in the furnace (2), in mm; This refers to the density of the glass powder; the unit is g / mm². 3 ; This refers to the density of the substrate glass, expressed in g / mm². 3 ; The volume conversion coefficient for glass powder melting into molten glass; is the volume conversion coefficient of the substrate glass melting into molten glass; L is the length inside the furnace, in mm; W is the width inside the furnace, in mm.

2. The method for monitoring the liquid level of molten glass in a furnace in a substrate glass preparation channel according to claim 1, characterized in that, The weight of the glass powder added is set as M. 投料 M 投料 =M2-M3+M1-M0.

3. The method for monitoring the liquid level of molten glass in a furnace in a substrate glass preparation channel according to claim 1, characterized in that, The and Adjustments are made based on the actual height of the molten glass level obtained by manual measurement to correct the molten glass level height in the kiln (2).

4. The method for monitoring the liquid level of molten glass in a furnace in a substrate glass preparation channel according to claim 1, characterized in that, The substrate glass preparation process also includes setting a target liquid level height. The difference between the theoretical liquid level and the target liquid level height is denoted as δ, and a threshold value is set as δ. 阈值 If |δ| is less than or equal to δ 阈值 If the liquid glass level in the furnace (2) meets the requirements, then |δ| is greater than δ 阈值 If the glass melt level in the furnace (2) does not meet the requirements, the glass melt level in the furnace (2) needs to be adjusted. If |δ| is greater than δ 阈值 When δ is positive, it indicates that the liquid level of the molten glass in the furnace (2) is higher than the target liquid level. Therefore, the liquid level of the molten glass in the furnace (2) can be made to meet the requirements by reducing the feeding frequency of the feeding system. If |δ| is greater than δ 阈值 When δ is negative, it indicates that the liquid level of the glass melt in the furnace (2) is lower than the target liquid level. Then, by increasing the feeding frequency of the feeding system, the liquid level of the glass melt in the furnace (2) can meet the requirements.

5. The method for monitoring the liquid level of molten glass in a furnace in a substrate glass preparation channel according to claim 1, characterized in that, The feeding frequency of the feeding system is set to P; Wherein, P0 is the operating frequency of the feeder in the feeding system (1) before adjustment, in units of n / min; P e The rated frequency of the feeder in the feeding system (1) is expressed in n / min; δ is the weight of glass powder that the feeder in the feeding system (1) can feed at the rated frequency, in g; δ is the difference between the theoretical height of the glass melt and the target height, in mm; T is the time it takes for the glass melt in the furnace to reach the target height.

6. A furnace glass melt level monitoring system for a substrate glass preparation channel, characterized in that, The method for monitoring the liquid level of molten glass in a furnace using any one of claims 1 to 5 includes: The data acquisition unit is configured to acquire the glass powder weighing data and substrate glass weighing data of the online weighing system for furnace glass powder and the online weighing system for substrate glass (5); The data processing unit is configured to calculate the input weight of glass powder and the output amount of the substrate glass channel based on the acquired glass powder weighing data and substrate glass weighing data, and to set the glass powder melting into liquid glass volume conversion coefficient and the substrate glass melting into liquid glass volume conversion coefficient, and then calculate the liquid glass level height in the furnace (2) to obtain the theoretical liquid glass level height. The parameter calibration unit is configured to compare the actual height of the molten glass obtained by manually measuring the height of the molten glass in the furnace (2) with the theoretical height of the molten glass, and to correct the volume conversion coefficient of the glass powder melting into molten glass and the volume conversion coefficient of the substrate glass melting into molten glass until the actual height of the molten glass and the theoretical height of the molten glass are consistent. The liquid level control unit adjusts the feeding frequency of the feeding system by comparing the difference between the theoretical height of the molten glass and the target liquid level height set during the preparation of the substrate glass, thereby realizing the monitoring and control of the molten glass level height in the kiln (2).

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