A method for platinum channel oxide compensation of TFT-LCD

Abstract

This invention relates to the field of TFT-LCD glass manufacturing technology, specifically disclosing a method for oxidation compensation in TFT-LCD platinum channels, comprising the following steps: calculating the electrical power ΔP required to raise the temperature of n heating sections in the platinum channel by 1°C based on the flow rate Q of the molten glass in daily use. n n is the number of heating sections; once the flow rate of the molten glass in the platinum channel stabilizes at Q, the stable power of the n heating sections is calibrated as P. n Collect the power P of the n heating sections within the platinum channel on day N. nN ; Calculate the daily oxidation compensation ΔT for n-1 heating sections. n‑1 This invention determines whether oxidation compensation is needed for the platinum channel. It calibrates the oxidation compensation amount of the platinum channel thermocouples, ensuring that each heating section of the platinum channel always operates within a suitable temperature range, thus guaranteeing the quality of the TFT glass and ensuring the long-term stable operation of the platinum channel.

Description

Technical Field

[0001] This invention relates to the field of TFT-LCD glass manufacturing technology, and more specifically, to a method for oxidation compensation of platinum channels in TFT-LCDs. Background Technology

[0002] In TFT-LCD glass production, platinum channels are used to directly heat the molten glass for clarification, homogenization, and cooling. Platinum-rhodium alloy thermocouples are welded to the outer wall of the platinum channel to monitor the molten glass temperature and adjust the heating power accordingly to control the temperature and achieve high-quality glass production. Because the platinum channel thermocouples are directly welded to the outer wall of the platinum tube, and due to prolonged high-temperature operation in harsh environments, the thermoelectric potential of the measuring thermocouples slowly decreases over time. This leads to an increasingly large error between the measured temperature by the thermocouples and the actual temperature of the platinum channel. The platinum channel operates in a temperature-controlled mode, where the power regulator adjusts the power to ensure the measured temperature by the thermocouples meets the set temperature. Without oxidation compensation for the monitoring thermocouples, the actual temperature of the platinum channel will deviate further from the set temperature over time, not only increasing defects such as platinum inclusions and bubbles but also reducing the lifespan of the platinum channel. This severely restricts the economic efficiency of TFT-LCD glass production.

[0003] The current oxidation compensation method involves perforating the platinum channel in front of the stirring tank position and installing perforated thermocouples, then welding thermocouples to the stirring tank position. Oxidation compensation is then performed by comparing the relative trends of the two sets of thermocouples. However, in practical use, this method has the following drawbacks: ① The platinum channel has many heating circuits. This oxidation compensation method requires perforated thermocouples to be installed in each heating circuit to perform oxidation compensation for each heating circuit, which increases the number of thermocouples used and increases equipment investment costs. ② Setting up a perforated thermocouple requires drilling holes in the platinum channel, which can easily cause glass melt leakage in the platinum channel; ③ In the high-temperature section of the platinum channel (temperature greater than 1600℃), perforation will increase the heat dissipation of the platinum channel, making it difficult for the glass to heat up. In addition, the high temperature will cause the perforated thermocouple to deform and be damaged, rendering it ineffective. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide a method for oxidation compensation of platinum channels in TFT-LCDs, which can scientifically and uniformly compensate for oxidation in each heating section of the platinum channel, so that the entire platinum channel can operate within a suitable temperature range for a long time, avoiding the increase of defects such as platinum stones and bubbles caused by temperature measurement distortion due to thermocouple oxidation, and the reduction of the service life of the platinum channel; The solution adopted by this invention to solve the technical problem is: A method for oxidation compensation of platinum channels in TFT-LCDs specifically includes the following steps: Based on the flow rate Q of the molten glass in the platinum channel during normal use, calculate the electrical power ΔP required to raise the temperature of n heating sections in the platinum channel by 1°C. n， n is the number of heating sections; Once the flow rate of the molten glass in the platinum channel stabilizes at Q, the stable power of the n heating sections is calibrated as P. n Collect the power P of the n heating sections within the platinum channel on day N. nN ; Calculate the daily oxidation compensation ΔT for n-1 heating sections. n-1 ; Determine whether oxidation compensation should be applied to the platinum channel; In some possible implementations, the daily oxidation compensation ΔT for n-1 heating sections is calculated. n-1 The formula for calculation is: △T n-1 = .

[0005] In some possible implementations, determining whether to perform oxidation compensation for each heating channel specifically refers to: The oxidation compensation amount is analyzed from the nth heating section, which is the outlet section, to the first heating section, which is the inlet section; When |△T n-1 When |>0, oxidation compensation is performed on the corresponding heating section daily based on the calculation results; If △T n-1 When =0, no oxidation compensation is performed for the corresponding heating section; In some possible implementations, the platinum channel has six heating sections, including a first heating section, a second heating section, a third heating section, a fourth heating section, a fifth heating section, and a sixth heating section arranged sequentially; a temperature monitoring component is provided on each heating section; the first heating section is connected to the melting zone of the kiln.

[0006] In some possible implementations, the daily oxidation compensation amount for the first heating section, the second heating section, the third heating section, the fourth heating section, and the fifth heating section is calculated; The daily oxidation compensation for the fifth heating section is: △T5= ; The daily oxidation compensation for the fourth heating section is: △T4= ; The daily oxidation compensation for the third heating section is: △T3= ; The daily oxidation compensation for the second heating section is: ΔT2 = ; The daily oxidation compensation for the first heating section is: ΔT1= ; in, N is the number of days; P 6N The power of the sixth heating section on day N; P6 represents the stable power of the sixth heating section; △P6 is the electrical power required to raise the temperature of the sixth heating section by 1℃; P 5N The power of the fifth heating section on day N; P5 is the stable power of the fifth heating section; △P5 is the electrical power required to raise the temperature of the fifth heating section by 1℃; P 4N The power of the fourth heating section on day N; P4 is the stable power of the fourth heating section; △P4 is the electrical power required to raise the temperature of the fourth heating section by 1℃; P 3N The power of the third heating section on day N; P3 is the stable power of the third heating section; △P3 is the electrical power required to raise the temperature of the second heating section by 1℃; P 2N The power of the second heating section on day N; P2 is the stable power of the second heating section; △P2 is the electrical power required to raise the temperature of the second heating section by 1℃; In some possible implementations, when determining whether to perform oxidation compensation for the fifth heating section; When |△T5|>0, oxidation compensation is performed on the fifth heating section daily according to the calculation results; If ΔT5=0, no oxidation compensation is required for the fifth heating section; In some possible implementations, when determining whether to perform oxidation compensation for the fourth heating section; When |△T4|>0, oxidation compensation is performed on the fourth heating section every day according to the calculation results; If ΔT4=0, no oxidation compensation is required for the fourth heating section; In some possible implementations, when determining whether to perform oxidation compensation for the third heating section; When |△T3|>0, oxidation compensation is performed on the third heating section every day according to the calculation results; If ΔT3=0, no oxidation compensation is required for the third heating section; In some possible implementations, when determining whether to perform oxidation compensation for the second heating section; When |△T2|>0, oxidation compensation is performed on the second heating section daily according to the calculation results; If ΔT2=0, no oxidation compensation is required for the second heating section; When determining whether oxidation compensation should be performed in the first heating section; When |△T1|>0, oxidation compensation is performed on the first heating section every day according to the calculation results; If ΔT1=0, no oxidation compensation is performed on the first heating section.

[0007] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention can effectively calibrate the oxidation compensation of the platinum channel thermocouple, ensuring that each heating section of the platinum channel always operates within a suitable temperature range, thus guaranteeing the quality of the TFT glass and enabling the platinum channel to operate stably for a long time. Attached Figure Description

[0008] Figure 1 This is a schematic diagram showing the connection between the platinum channel and the furnace melting zone when the platinum channel has six heating sections in this invention; Among them: 10, furnace melting zone; 20, platinum channel; 1, first heating section; 2, second heating section; 3, third heating section; 4, fourth heating section; 5, fifth heating section; 6, sixth heating section. Detailed Implementation

[0009] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," etc., do not indicate a quantity limitation, but rather indicate the existence of at least one. In the implementation of this application, "and / or" describes the association relationship of related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more. For example, multiple positioning posts refer to two or more positioning posts. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0010] The present invention will now be described in detail.

[0011] like Figure 1 As shown: A method for oxidation compensation of a platinum channel 20 in a TFT-LCD includes a temperature monitoring component installed on each heating section; the first heating section 1 is connected to the melting zone 10 of a furnace; the method specifically includes the following steps: Based on the flow rate Q of the molten glass in the platinum channel 20 during normal use, calculate the electrical power ΔP required to raise the temperature of n heating sections in the platinum channel 20 by 1℃. n , where n is the number of heating sections; calculate the daily oxidation compensation ΔT for n-1 heating sections. n-1 The calculation formula is as follows; the n-1 heating sections described here refer to all heating sections except for the nth heating section that serves as the outlet section; △T n-1 = .

[0012] Once the flow rate of the molten glass in the platinum channel 20 stabilizes at Q, the stable power of the n heating sections is calibrated as P. n Collect the power P of n heating sections within the platinum channel on day N. nN ; Calculate the daily oxidation compensation ΔT for n-1 heating sections. n-1 ; Determine whether to perform oxidation compensation on platinum channel 20; specifically: The oxidation compensation amount is analyzed from the (n-1)th heating section near the exit section to the first heating section 1, which serves as the inlet section; When △T n-1 When >0, calculate the result △T daily. n-1 Oxidation compensation is performed on the corresponding heating section; If △T n-1 When =0, no oxidation compensation is performed for the corresponding heating section; In TFT glass production, the platinum channel 20 is placed in a constant temperature and humidity room, where the external environment remains stable over a long period of time.

[0013] like Figure 1 As shown, the platinum channel 20 has six heating sections, including a first heating section 1, a second heating section 2, a third heating section 3, a fourth heating section 4, a fifth heating section 5, and a sixth heating section 6 arranged sequentially. The glass liquid level is much higher than the outlet height of the sixth heating section 6 in the platinum channel 20. The flow of the platinum channel 20 is controlled by adjusting the viscosity of the glass in the sixth heating section 6, which serves as the outlet section, to ensure the glass outflow and maintain the glass liquid level. If the thermocouple in the sixth heating section 6, which serves as the outlet section, oxidizes and causes a deviation in the measured temperature, the glass flow rate will change significantly and directly. To ensure a constant glass flow rate, the actual temperature of the sixth heating section 6, which is the outlet section, needs to be maintained at a constant value. If the actual temperature deviates from this value, the target control temperature will be manually adjusted to ensure a constant glass flow rate. Therefore, the process of stabilizing the flow rate in the sixth section naturally corrects the thermocouple deviation. Due to the law of conservation of energy, the power of the sixth heating section 6, which is the outlet section, directly reflects the temperature of the incoming glass in the platinum channel 20. Thus, the power of the sixth heating section 6, which is the outlet section, can be used as a direct reference to calculate backwards one by one. By ensuring that the operating power of each heating section is equal to the rated power over a long period of time, the entire platinum channel 20 can operate within a suitable temperature range. This avoids the oxidation of the thermocouples in the platinum channel 20, the distortion of temperature measurement, the increase of defects such as platinum concretions and bubbles, and the reduction of the service life of the platinum channel 20.

[0014] In some possible implementations, the daily oxidation compensation amount for the first heating section 1, the second heating section 2, the third heating section 3, the fourth heating section 4, and the fifth heating section 5 is calculated; The daily oxidation compensation for the fifth heating section 5 is: △T5= ; The daily oxidation compensation for the fourth heating section 4 is: △T4= ; The daily oxidation compensation for the third heating section 3 is: △T3= ; The daily oxidation compensation for the second heating section 2 is: ΔT2 = ; The daily oxidation compensation for the first heating section 1 is: ΔT1= ; in, N is the number of days; P 6N The power of the sixth heating section 6 on day N; P6 is the stable power of the sixth heating section 6; △P6 is the electrical power required to raise the temperature of the sixth heating section 6 by 1℃; P 5N The power of the fifth heating section 5 on day N; P5 is the stable power of the fifth heating section 5; △P5 is the electrical power required to raise the temperature of the fifth heating section 5 by 1℃; P 4N The power of the fourth heating section 4 on day N; P4 is the stable power of the fourth heating section 4; △P4 is the electrical power required to raise the temperature of the fourth heating section 4 by 1℃; P 3NThe power of the third heating section 3 on day N; P3 is the stable power of the third heating section 3; △P3 is the electrical power required to raise the temperature of the second heating section 2 by 1℃; P 2N The power of the second heating section 2 on day N; P2 is the stable power of the second heating section 2; △P2 is the electrical power required to raise the temperature of the second heating section 2 by 1℃; In some possible implementations, when determining whether to perform oxidation compensation for the fifth heating section 5; When |△T5|>0, the fifth heating section 5 is oxidized and compensated daily according to the calculated result △T5. Specifically, if the calculated value of ΔT5 is 0.1, then the oxidation compensation result of the fifth heating section 5 is 0.1; if the calculated value of ΔT5 is -0.1, then the oxidation compensation result of the fifth heating section 5 is -0.1. If ΔT5=0, no oxidation compensation is required for the fifth heating section 5; In some possible implementations, when determining whether to perform oxidation compensation for the fourth heating section 4; When |△T4|>0, oxidation compensation is performed on the fourth heating section 4 daily according to the calculation results; If ΔT4=0, no oxidation compensation is required for the fourth heating section 4; In some possible implementations, when determining whether to perform oxidation compensation for the third heating section 3; When |△T3|>0, oxidation compensation is performed on the third heating section 3 daily according to the calculation results; If ΔT3=0, no oxidation compensation is required for the third heating section 3; In some possible implementations, when determining whether to perform oxidation compensation for the second heating section 2; When |△T2|>0, oxidation compensation is performed on the second heating section 2 daily according to the calculation results; If ΔT2=0, no oxidation compensation is required for the second heating section 2; When determining whether oxidation compensation should be performed in the first heating section 1; When |△T1|>0, oxidation compensation is performed on the first heating section 1 daily according to the calculation results; If ΔT1=0, no oxidation compensation is required for the first heating section 1.

[0015] This invention enables the actual operating power of each heating section to be maintained within the rated power range. One or more thermocouples are welded to each heating section of the platinum channel 20, and the temperature of the molten glass is controlled by passing a low-pressure, high-current through the platinum channel 20. The temperature measured by the thermocouple is fed back to the control system, which adjusts the current flowing into the platinum channel 20 to keep the molten glass at the target temperature. The target temperature is manually corrected daily through the above calculations to avoid the oxidation of the thermocouple causing temperature distortion in the platinum channel 20, which leads to an increase in defects such as platinum stones and bubbles, and a reduction in the service life of the platinum channel 20. After using this invention, the oxidation compensation of thermocouples in each heating section of the platinum channel 20 is carried out scientifically and uniformly, so that the entire platinum channel 20 can operate in a suitable temperature range for a long time. This avoids the increase of defects such as platinum stones and bubbles caused by temperature measurement distortion due to thermocouple oxidation, and the reduction of the service life of the platinum channel 20.

[0016] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A method for oxidation compensation of platinum channels in TFT-LCDs, characterized in that, Specifically, the following steps are included: Based on the flow rate Q of the molten glass in the platinum channel during normal use, calculate the electrical power ΔP required to raise the temperature of n heating sections in the platinum channel by 1°C. n n is the number of heating sections; Once the flow rate of the molten glass in the platinum channel stabilizes at Q, the stable power of the n heating sections is calibrated as P. n Collect the power P of the n heating sections within the platinum channel on day N. nN ; Calculate the daily oxidation compensation ΔT for n-1 heating sections. n-1 ; Determine whether oxidation compensation should be applied to the platinum channel.

2. The method for oxidation compensation of platinum channels in TFT-LCD according to claim 1, characterized in that, Calculate the daily oxidation compensation ΔT for n-1 heating sections. n-1 The formula for calculation is: △T n-1 = 。 3. The method for oxidation compensation of platinum channels in TFT-LCD according to claim 2, characterized in that, Determining whether to perform oxidation compensation for each heating channel specifically refers to: The oxidation compensation amount is analyzed from the nth heating section, which is the outlet section, to the first heating section, which is the inlet section; When |△T n-1 When |>0, oxidation compensation is performed on heating section n-1 daily based on the calculation results; If △T n-1 When =0, no oxidation compensation is performed for the corresponding heating section.

4. The method for oxidation compensation of platinum channels in TFT-LCD according to claim 3, characterized in that, The platinum channel has six heating sections, including a first heating section, a second heating section, a third heating section, a fourth heating section, a fifth heating section, and a sixth heating section arranged sequentially; a temperature monitoring component is provided on each heating section; the first heating section is connected to the melting zone of the kiln.

5. A method for oxidation compensation of platinum channels in TFT-LCDs according to claim 4, characterized in that, Calculate the daily oxidation compensation for the first, second, third, fourth, and fifth heating sections; The daily oxidation compensation for the fifth heating section is: △T5= ; The daily oxidation compensation for the fourth heating section is: △T4= ; The daily oxidation compensation for the third heating section is: △T3= ; The daily oxidation compensation for the second heating section is: ΔT2 = ; The daily oxidation compensation for the first heating section is: ΔT1= ; in, N is the number of days; P 6N The power of the sixth heating section 6 on day N; P6 is the stable power of the sixth heating section 6; △P6 is the electrical power required to raise the temperature of the sixth heating section 6 by 1℃; P 5N The power of the fifth heating section on day N; P5 is the stable power of the fifth heating section; △P5 is the electrical power required to raise the temperature of the fifth heating section by 1℃; P 4N The power of the fourth heating section on day N; P4 is the stable power of the fourth heating section; △P4 is the electrical power required to raise the temperature of the fourth heating section by 1℃; P 3N The power of the third heating section on day N; P3 is the stable power of the third heating section; △P3 is the electrical power required to raise the temperature of the second heating section by 1℃; P 2N The power of the second heating section on day N; P2 is the stable power of the second heating section; △P2 is the electrical power required to raise the temperature of the second heating section by 1℃.

6. The method for oxidation compensation of platinum channels in TFT-LCD according to claim 5, characterized in that, When determining whether oxidation compensation should be performed in the fifth heating section; When |△T5|>0, oxidation compensation is performed on the fifth heating section daily according to the calculation results; If ΔT5=0, no oxidation compensation is required for the fifth heating section.

7. A method for oxidation compensation of platinum channels in TFT-LCDs according to claim 6, characterized in that, When determining whether oxidation compensation should be performed in the fourth heating section; When |△T4|>0, oxidation compensation is performed on the fourth heating section every day according to the calculation results; If ΔT4=0, no oxidation compensation is required for the fourth heating section.

8. A method for oxidation compensation of platinum channels in TFT-LCDs according to claim 7, characterized in that, When determining whether oxidation compensation should be performed in the third heating section; When |△T3|>0, oxidation compensation is performed on the third heating section every day according to the calculation results; If ΔT3=0, no oxidation compensation is required for the third heating section.

9. A method for oxidation compensation of platinum channels in TFT-LCDs according to claim 8, characterized in that, When determining whether oxidation compensation should be performed in the second heating section; When |△T2|>0, oxidation compensation is performed on the second heating section daily according to the calculation results; If ΔT2=0, no oxidation compensation is required for the second heating section; When determining whether oxidation compensation should be performed in the first heating section; When |△T1|>0, oxidation compensation is performed on the first heating section every day according to the calculation results; If ΔT1=0, no oxidation compensation is performed on the first heating section.

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