CN114791229A - System and method for detecting inflow airflow at fire hole of glass forming annealing furnace - Google Patents
System and method for detecting inflow airflow at fire hole of glass forming annealing furnace Download PDFInfo
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- 238000005259 measurement Methods 0.000 claims abstract description 6
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- 238000009529 body temperature measurement Methods 0.000 claims description 5
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Abstract
The invention provides a system and a method for detecting the air flow flowing into the mouth of a glass forming annealing furnace, which can feed back and monitor the change condition of the air flow inside and outside the annealing furnace in time, improve the judgment efficiency, have strong real-time performance, can carry out quantitative detection and ensure the quality of glass forming products. The device comprises a temperature detection device and a control device, wherein the temperature detection device comprises a temperature detection sensor arranged at a second-layer calibration position of the annealing furnace and a temperature detection sensor arranged at a first-layer calibration position of the annealing furnace, and the control device comprises a signal input module, an algorithm device and a control output device; the signal input module is used for converting a measurement result of the temperature detection device into a temperature detection signal and then inputting the temperature detection signal to the control output device, the algorithm device is used for inputting a control algorithm to the control output device, and the control output device is used for outputting an operation result as an external airflow inflow index of the annealing furnace after operation is carried out according to the temperature detection signal and the control algorithm.
Description
Technical Field
The invention relates to the technical field of TFT-LCD photoelectric glass production, in particular to a system and a method for detecting inflow airflow at a furnace mouth of a glass forming annealing furnace.
Background
An external inflow airflow exists at the mouth of the TFT-LCD photoelectric glass forming annealing furnace, and the external airflow flows into the annealing furnace through the mouth of the annealing furnace, so that the temperature field and the gas flow field in the furnace are influenced, and the forming quality of the substrate glass is further influenced. Therefore, the detection of the external air flow flowing into the mouth of the annealing furnace is the basic premise for effectively controlling the influence of the external flowing air flow on the quality of the annealing furnace and the formed product.
At present, no direct and effective detection technology exists for the flow rate of external air flow flowing in through an annealing furnace mouth, and the change condition of the external air flow flowing into the annealing furnace is generally judged according to experience through the quality change of a formed product. The detection method in the prior art has the problems of large judgment hysteresis, difficult quantization operation difficulty, large influence on production under abnormal conditions and the like.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a system and a method for detecting the air flow flowing into the mouth of a glass forming annealing furnace, which can timely feed back and monitor the change condition of the air flow inside and outside the annealing furnace, improve the judgment efficiency, have strong real-time performance, can carry out quantitative detection and ensure the quality of glass forming products.
In order to achieve the purpose, the invention provides the following technical scheme:
a glass forming annealing furnace mouth inflow air current detection system comprises a temperature detection device and a control device, wherein the annealing furnace is sequentially divided into a plurality of layers from bottom to top along the direction from an inlet to an outlet;
the temperature detection device comprises a temperature detection sensor arranged at the calibration position of the second layer of the annealing furnace and a temperature detection sensor arranged at the calibration position of the first layer of the annealing furnace, and the control device comprises a signal input module, an algorithm device and a control output device;
the signal input module is used for converting the measurement result of the temperature detection device into a temperature detection signal and inputting the temperature detection signal to the control output device, the algorithm device is used for inputting a control algorithm to the control output device, and the control output device is used for outputting an operation result as an external airflow inflow index of the annealing furnace after operation is performed according to the temperature detection signal and the control algorithm.
Preferably, the first layer of annealing furnace is positioned into three groups of first layer temperature measuring points arranged on any three sides of the first layer of annealing furnace.
Preferably, the calibration positions of the second layer of the annealing furnace are three groups of second layer temperature measuring points arranged on three sides of the second layer of the annealing furnace corresponding to the first layer of the annealing furnace.
Preferably, the first layer of temperature measuring points are respectively arranged at the central positions of any three sides of the first layer of the annealing furnace, and the second layer of temperature measuring points are respectively arranged at the central positions of the second layer of the annealing furnace and the three sides of the first layer of the annealing furnace corresponding to the second layer of the annealing furnace.
Preferably, the control algorithm comprises an algorithm for arithmetically differencing the temperatures at the nominal positions of the second layer of the annealing furnace and the first layer of the annealing furnace and an algorithm for weighted averaging the arithmetically differenced values.
A method for detecting the inflow airflow at the fire hole of a glass forming annealing furnace comprises the following steps:
measuring a plurality of groups of furnace temperatures at a first layer calibration position of the annealing furnace;
measuring a plurality of groups of furnace temperatures at a calibration position of a second layer of the annealing furnace;
carrying out real-time arithmetic difference calculation on the multiple groups of furnace internal temperatures of the first layer of the annealing furnace and the multiple groups of furnace internal temperatures of the second layer of the annealing furnace correspondingly to obtain multiple groups of arithmetic difference values;
and carrying out real-time weighted average on the plurality of groups of arithmetic difference values to obtain the external airflow inflow index of the annealing furnace.
Preferably, after the external airflow inflow index of the annealing furnace is obtained, the external airflow inflow index of the annealing furnace is compared with the technological parameter index, and the external airflow inflow state is judged;
if the external airflow inflow index of the annealing furnace does not exceed the process parameter index range, the external airflow inflow is stable and normal;
if the external airflow inflow index of the annealing furnace exceeds the technological parameter index range, the external airflow inflow is too large or too small, and the external airflow is adjusted by adopting an external airflow control means until the external airflow of the annealing furnace flows into the index regression technological parameter index range.
Preferably, the process parameter index ranges from 100 ℃ ± 50 ℃.
Preferably, the measuring the plurality of sets of furnace temperatures at the first layer calibration position of the annealing furnace comprises:
the temperature of the center position of any three sides of the first layer of the annealing furnace is measured, and three groups of furnace temperatures t1A, t1B and t1C are obtained.
Preferably, the measuring the plurality of sets of furnace temperatures at the calibration position of the second layer of the annealing furnace comprises:
the temperature of the second layer of the annealing furnace and the temperature of the center position of three corresponding sides of the first layer of the annealing furnace are measured, and three groups of furnace temperatures t2A, t2B and t2C are obtained.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a glass forming annealing furnace fire hole inflow air flow detection system, which designs a plurality of groups of temperature measuring points on two layers (a second annealing furnace layer and a first annealing furnace layer) close to an inlet of an annealing furnace, namely an area into which external air flows, and installs temperature detection sensors at the corresponding temperature measuring points, thereby obtaining the furnace temperature at a calibration position of the second annealing furnace layer and a calibration position of the first annealing furnace layer, and transmitting the obtained furnace temperature measuring results to a set control device for corresponding signal conversion, and then calculating according to a control algorithm to obtain a real-time dynamic calculation value of the annealing furnace fire hole: the external airflow inflow index of the annealing furnace has real-time property and historical data reproducibility, can continuously quantify the external airflow inflow state flowing into the annealing furnace on line, has data support significance for analyzing and controlling external airflow inflow of the annealing furnace and quality fluctuation of formed products, and has data support significance for a temperature field and a flow field change relation in the annealing furnace, and simultaneously provides control conditions for external airflow inflow control of the annealing furnace.
The invention provides a method for detecting the inflow air flow of a mouth of a glass forming annealing furnace, which changes the current technical situation that no direct and effective detection is available for the flow rate of the external air flow flowing in through the mouth of the annealing furnace at present, obtains the furnace temperatures of a plurality of groups of temperature measuring points by measuring the temperatures of the area part in which the external air flow flows, namely the second layer of the annealing furnace and the first layer of the annealing furnace, performs real-time arithmetic difference dynamic comparison on the temperatures of the plurality of groups of furnaces at the positions corresponding to the temperature measuring points of the second layer of the annealing furnace and the first layer of the annealing furnace, performs real-time weighted average operation on the plurality of groups of real-time dynamic differences to obtain a real-time dynamic operation value for representing the inflow state of the external air flow flowing into the annealing furnace, and takes the real-time dynamic operation value as a judgment index of the inflow state of the external air flow of the annealing furnace, and compares the representation index obtained by the detection method with a standard process parameter index, the external airflow inflow condition of the current annealing furnace mouth can be reflected timely, the weighted average value of the external airflow inflow condition is obtained after the temperatures of multiple groups of positions on the same layer are measured, errors caused by uneven distribution of the external airflow inflow of single group data results can be reduced as far as possible, the precision of detection results is improved, the reliability of detection judgment is improved, meanwhile, temperature measurement data are acquired in real time through a temperature measurement device, the real-time data results are directly subjected to control algorithm operation to obtain operation results, the obtained annealing furnace external airflow inflow index has real-time performance, the current airflow inflow state of the annealing furnace mouth can be accurately judged, and corresponding adjustment can be made timely.
Furthermore, the method can store the external airflow inflow index of the annealing furnace obtained by each operation to generate historical data, so that the subsequent inspection, analysis and comparison are facilitated, and the result has guiding significance for the subsequent design of the annealing furnace and quality control of the formed product.
Drawings
FIG. 1 is a schematic view of a layout for detecting the inflow of gases into the mouth of a forming annealing furnace according to an embodiment of the present invention;
FIG. 2 is a flow chart of the method for detecting the inflow gas at the fire hole of the annealing furnace according to the present invention;
fig. 3 is a schematic diagram of the control device of the present invention.
In the figure, 1, an annealing furnace; 2. a second layer of an annealing furnace; 3. annealing the first layer of the furnace; 4. a furnace mouth of the annealing furnace; 5. an external air flow.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
as shown in figure 1, the glass forming annealing furnace mouth inflow air flow detection system comprises a temperature detection device and a control device, wherein the annealing furnace 1 is sequentially divided into a plurality of layers from bottom to top along the direction from an inlet to an outlet;
the temperature detection device comprises a temperature detection sensor arranged at the calibration position of the second layer 2 of the annealing furnace and a temperature detection sensor arranged at the calibration position of the first layer 3 of the annealing furnace, and the control device comprises a signal input module, an algorithm device and a control output device;
as shown in fig. 3, the signal input module is configured to convert a measurement result of the temperature detection device into a temperature detection signal and input the temperature detection signal to the control output device, the algorithm device is configured to input a control algorithm to the control output device, and the control output device is configured to output an operation result as an index of inflow of an external airflow of the annealing furnace after performing an operation according to the temperature detection signal and the control algorithm.
The invention provides a glass forming annealing furnace mouth inflow air flow detection system, which designs a plurality of groups of temperature measuring points on two layers (a second layer 2 of the annealing furnace and a first layer 3 of the annealing furnace) close to a furnace mouth 4 of the annealing furnace, namely an area into which external air flows, and installs temperature detection sensors at the corresponding temperature measuring points, thereby obtaining the furnace temperature at a calibration position of the second layer 2 of the annealing furnace and a calibration position of the first layer 3 of the annealing furnace, and transmitting the obtained furnace temperature measuring result to a set control device for corresponding signal conversion, and then calculating according to a set control algorithm to obtain a real-time dynamic calculation value of the furnace mouth of the annealing furnace: the external airflow inflow index of the annealing furnace has real-time performance and historical data reproducibility, can continuously quantify the inflow state of the external airflow flowing into the annealing furnace 1 on line, has data support significance for analyzing and controlling the external airflow inflow of the annealing furnace and the quality fluctuation of a formed product, and has data support significance for the relationship between a temperature field and a flow field in the annealing furnace, and simultaneously provides control conditions for controlling the external airflow inflow of the fire hole 4 of the annealing furnace.
Preferably, as shown in fig. 1, the calibration positions of the first layer 3 of the annealing furnace are three groups of first layer temperature measuring points arranged on any three sides of the first layer 3 of the annealing furnace.
In one embodiment, the center points of the left, middle and right sides of the first layer 3 of the annealing furnace can be selected as the calibration positions of the first layer 3 of the annealing furnace, a first layer temperature measuring point is arranged, and a temperature detecting sensor is arranged for detecting the temperature in the furnace.
Preferably, as shown in fig. 1, the calibration positions of the second annealing furnace layer 2 are three groups of second layer temperature measuring points which are arranged on three sides of the second annealing furnace layer 2 corresponding to the first annealing furnace layer 3.
In one embodiment, the center points of the left, middle and right sides of the second layer 2 of the annealing furnace can be selected as the calibration positions of the second layer 2 of the annealing furnace, the second layer temperature measuring points are arranged, and the temperature detecting sensors are installed to detect the temperature in the annealing furnace.
Wherein t1A is the temperature in the left side of the first layer 3 area of the annealing furnace; t1B is the furnace temperature at the middle side of the first layer 3 area of the annealing furnace; t1C is the temperature in the furnace at the right side of the first layer 3 area of the annealing furnace; t2A is the temperature in the left side of the second layer 2 area of the annealing furnace; t2B is the furnace temperature at the middle side of the second layer 2 area of the annealing furnace; t2C is the furnace temperature in the right side of the second layer 2 zone of the annealing furnace.
Preferably, the control algorithm comprises an algorithm for arithmetically differencing the temperatures at nominal positions of the second layer 2 and the first layer 3 of the annealing furnace and an algorithm for weighted averaging the arithmetically differenced values.
In this embodiment, the real-time comparison operation in the control device includes: performing real-time arithmetic differencing on t2A and t1A, performing real-time arithmetic differencing on t2B and t1B, and performing real-time arithmetic differencing on t2C and t 1C; and carrying out real-time averaging on the real-time arithmetic difference between t2A and t1A, the real-time arithmetic difference between t2B and t1B and the real-time arithmetic difference between t2C and t1C to obtain three groups of comparison operation results of the external airflow inflow index of the annealing furnace, and carrying out real-time weighted averaging operation to obtain a dynamic operation value to represent the external airflow inflow state flowing into the annealing furnace, wherein the dynamic operation value is called the external airflow inflow index of the annealing furnace.
The invention also provides a method for detecting the inflow airflow at the fire hole of the glass forming annealing furnace, which comprises the following steps as shown in figure 2:
measuring a plurality of groups of furnace temperatures at the calibration position of the first layer 3 of the annealing furnace;
measuring a plurality of groups of furnace temperatures at the calibration position of the second layer 2 of the annealing furnace;
carrying out real-time arithmetic difference solving on the multiple groups of furnace internal temperatures of the first layer 3 of the annealing furnace and the multiple groups of furnace internal temperatures of the second layer 2 of the annealing furnace correspondingly to obtain multiple groups of arithmetic difference values;
and carrying out real-time weighted average on the plurality of groups of arithmetic difference values to obtain the external airflow inflow index of the annealing furnace.
The invention provides a method for detecting the inflow air current of a furnace mouth of a glass forming annealing furnace, which changes the current technical situation that the flow rate of the external air current flowing in through the furnace mouth 4 of the annealing furnace has no direct and effective detection, obtains the furnace temperatures of a plurality of groups of temperature measuring points by measuring the temperature of the area part in which the external air current flows, namely the second layer 2 of the annealing furnace and the first layer 3 of the annealing furnace which are close to the furnace mouth 4 of the annealing furnace, carries out real-time arithmetic difference dynamic comparison on the plurality of groups of furnace temperatures at the positions of the corresponding temperature measuring points of the second layer 2 of the annealing furnace and the first layer 3 of the annealing furnace, carries out real-time weighted average calculation on a plurality of groups of real-time dynamic difference values to obtain a real-time dynamic calculation value for representing the inflow state of the external air current flowing into the annealing furnace 1 as a judgment index of the inflow state of the external air current of the annealing furnace, and compares the representation index obtained by the detection method with a standard process parameter index, the external airflow inflow condition of the current annealing furnace mouth can be reflected timely, the weighted average value of the external airflow inflow condition is obtained after the temperatures of multiple groups of positions on the same layer are measured, errors caused by uneven distribution of the external airflow inflow of single group data results can be reduced as far as possible, the precision of detection results is improved, the reliability of detection judgment is improved, meanwhile, temperature measurement data are acquired in real time through a temperature measurement device, the real-time data results are directly subjected to control algorithm operation to obtain operation results, the obtained annealing furnace external airflow inflow index has real-time performance, the current airflow inflow state of the annealing furnace mouth can be accurately judged, and corresponding adjustment can be made timely.
Further, the annealing furnace external airflow inflow index obtained by each operation can be stored to generate historical data, so that the subsequent examination, analysis and comparison are facilitated, and the result has guiding significance for the subsequent design of the annealing furnace 1 and quality control of the formed product.
Further, after the external airflow inflow index of the annealing furnace is obtained, the external airflow inflow index of the annealing furnace is compared with the technological parameter index, and the external airflow inflow state is judged;
if the external airflow inflow index of the annealing furnace does not exceed the process parameter index range, the external airflow inflow is stable and normal, the glass forming process is not influenced, and adjustment is not needed;
if the external airflow inflow index of the annealing furnace exceeds the process parameter index range, the external airflow inflow is too large or too small, and the external airflow control means is required to adjust the external airflow until the external airflow of the annealing furnace flows into the index regression process parameter index range.
Preferably, the process parameter index ranges from 100 ℃ ± 50 ℃.
Preferably, the external airflow control means includes a flow meter for monitoring the inflow rate of the external airflow, and adjusting the inflow rate of the external airflow through a flow valve, if the calculated external airflow inflow index of the annealing furnace is lower than the range of the process parameter index by 100 ℃ ± 50 ℃, increasing the opening degree of the flow valve, and increasing the inflow rate of the external airflow until the external airflow inflow index of the annealing furnace returns to the range of the process parameter index, and if the calculated external airflow inflow index of the annealing furnace is higher than the range of the process parameter index by 100 ℃ ± 50 ℃, correspondingly decreasing the opening degree of the flow valve.
Wherein, the measurement of the plurality of groups of furnace temperatures at the calibration position of the first layer 3 of the annealing furnace comprises the following steps:
the temperature at the center position of any three sides of the first layer 3 of the annealing furnace is measured, and three groups of furnace temperatures t1A, t1B, t1C are obtained.
Wherein, the measurement of the plurality of groups of furnace internal temperatures at the calibration position of the second layer 2 of the annealing furnace comprises the following steps:
the temperature of the annealing furnace second layer 2 and the temperature of the annealing furnace first layer 3 at the center of three corresponding sides are measured, and three groups of furnace temperatures t2A, t2B and t2C are obtained.
The annealing furnace external airflow inflow index provided by the invention quantifies the airflow flowing into the annealing furnace mouth, and solves the problems of large judgment hysteresis, difficult quantification operation difficulty, large influence on production under abnormal conditions and the like in the method for judging the change condition of the airflow flowing into the annealing furnace inside and outside according to the quality change of a formed product and experience.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. The system for detecting the inflow airflow at the fire hole of the glass forming annealing furnace is characterized by comprising a temperature detection device and a control device, wherein the annealing furnace (1) is sequentially divided into a plurality of layers from bottom to top along the direction from an inlet to an outlet;
the temperature detection device comprises a temperature detection sensor arranged at the calibration position of the second layer (2) of the annealing furnace and a temperature detection sensor arranged at the calibration position of the first layer (3) of the annealing furnace, and the control device comprises a signal input module, an algorithm device and a control output device;
the signal input module is used for converting a measurement result of the temperature detection device into a temperature detection signal and then inputting the temperature detection signal to the control output device, the algorithm device is used for inputting a control algorithm to the control output device, and the control output device is used for outputting an operation result as an external airflow inflow index of the annealing furnace after operation is carried out according to the temperature detection signal and the control algorithm.
2. The system for detecting the mouth inflow gas flow of a glass forming lehr as claimed in claim 1, wherein the nominal positions of the first lehr layer (3) are three sets of first layer temperature measurement points disposed on any three sides of the first lehr layer (3).
3. The system for detecting the furnace mouth inflow gas flow of the glass forming annealing furnace according to claim 2, characterized in that the calibration positions of the second layer (2) of the annealing furnace are three groups of second layer temperature measuring points which are arranged on three sides of the second layer (2) of the annealing furnace corresponding to the first layer (3) of the annealing furnace.
4. The system for detecting the mouth inflow gas of a glass forming annealing furnace according to claim 3, wherein the first layer temperature measuring points are respectively arranged at the central positions of any three sides of the first layer (3) of the annealing furnace, and the second layer temperature measuring points are respectively arranged at the central positions of the second layer (2) of the annealing furnace corresponding to the three sides of the first layer (3) of the annealing furnace.
5. The system of claim 1, wherein the control algorithm comprises an algorithm for arithmetically differencing the temperatures at nominal positions of the second layer (2) and the first layer (3) of the lehr and an algorithm for weighted averaging the arithmetically differenced values.
6. A method for detecting the inflow airflow at the fire hole of a glass forming annealing furnace is characterized by comprising the following steps:
measuring a plurality of groups of furnace temperatures at the calibration position of the first layer (3) of the annealing furnace;
measuring a plurality of groups of furnace temperatures at the calibration position of the second layer (2) of the annealing furnace;
carrying out real-time arithmetic difference calculation on the multiple groups of furnace internal temperatures of the first layer (3) of the annealing furnace and the multiple groups of furnace internal temperatures of the second layer (2) of the annealing furnace correspondingly to obtain multiple groups of arithmetic difference values;
and carrying out real-time weighted average on the multiple groups of arithmetic difference values to obtain the inflow index of the air flow outside the annealing furnace.
7. The method for detecting the furnace mouth inflow air of the glass forming annealing furnace according to claim 6, wherein after the external air inflow index of the annealing furnace is obtained, the method further comprises the steps of comparing the external air inflow index of the annealing furnace with a process parameter index, and judging the external air inflow state;
if the external airflow inflow index of the annealing furnace does not exceed the process parameter index range, the external airflow inflow is stable and normal;
if the external airflow inflow index of the annealing furnace exceeds the technological parameter index range, the external airflow inflow is too large or too small, and the external airflow is adjusted by an external airflow control means until the external airflow inflow index of the annealing furnace is within the regression technological parameter index range.
8. The method for detecting the furnace mouth inflow gas flow of the glass forming annealing furnace according to claim 7, wherein the process parameter index is in the range of 100 ℃ ± 50 ℃.
9. The method of claim 6, wherein the measuring the plurality of sets of furnace temperatures at the nominal position of the first layer (3) of the lehr comprises:
the temperature of the center position of any three sides of the first layer (3) of the annealing furnace is measured, and three groups of furnace temperatures t1A, t1B and t1C are obtained.
10. The method for detecting the mouth inflow gas flow of a glass forming annealing lehr as claimed in claim 6, wherein the measuring the plurality of sets of the furnace internal temperatures at the nominal position of the second layer (2) of the lehr comprises:
and measuring the temperature of the second layer (2) of the annealing furnace and the temperature of the central position of three sides of the first layer (3) of the annealing furnace, and obtaining three groups of furnace temperatures t2A, t2B and t 2C.
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| WO2020129529A1 (en) * | 2018-12-21 | 2020-06-25 | 日本電気硝子株式会社 | Method for measuring temperature of glass article, and method for manufacturing glass article |
| CN212051120U (en) * | 2020-01-06 | 2020-12-01 | 广东华兴玻璃股份有限公司 | Automatic temperature regulating system of glass annealing furnace |
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| WO2020129529A1 (en) * | 2018-12-21 | 2020-06-25 | 日本電気硝子株式会社 | Method for measuring temperature of glass article, and method for manufacturing glass article |
| CN110746095A (en) * | 2019-09-29 | 2020-02-04 | 彩虹显示器件股份有限公司 | Substrate glass production forming equipment with refined temperature adjustment function |
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