Cover plate glass production line protective gas flow online control system

Abstract

The embodiment of the present disclosure provides a kind of cover glass production line protective gas flow online control system, comprising: gas supply pipe system, central control system and tin bath, gas supply pipe system is connected with central control system, gas supply pipe system is set on tin bath, the outer surface of main gas pipe first part is wrapped main gas pipe electric heating device and is located above tin bath, main gas pipe second part is inserted into tin bath and branch gas pipe is set on the outside of main gas pipe second part in tin bath, main gas pipe control regulating valve and main gas pipe gas flow and temperature monitor are set on the inner cavity of main gas pipe, tank top temperature monitor is set on tin bath adjacent to branch gas pipe, main gas pipe top welding seal structure is located in tin bath and closes the bottom end of main gas pipe second part;The main gas pipe electric heating control system of central control system is connected with main gas pipe electric heating device, and the gas supply flow control system is connected with the main gas pipe control regulating valve.The control system provided by the present disclosure realizes the online monitoring of the gas flow of protective gas, and reduces the temperature fluctuation in the tank of tin bath.

Description

Technical Field

[0001] This disclosure relates to the glass manufacturing industry, and more particularly to an online control system for the flow of protective gas in a cover glass production line. Background Technology

[0002] In the production of ultra-thin cover glass, the glass is formed in a high-temperature, sealed tin bath. In practical applications, nitrogen, hydrogen, sulfur dioxide, and other protective gases need to be continuously injected into the tin bath.

[0003] The annealing temperature in the tin bath is as high as 1000℃ or more. It is necessary to maintain the temperature stability in the tin bath by heating. Temperature instability will lead to poor quality such as uneven thickness, warping, and S-bending of the cover glass. The protective gas introduced is the main factor causing temperature instability. Therefore, online monitoring and control of the flow rate of protective gas introduced into the tin bath can significantly improve the quality of the cover glass.

[0004] In current production, a single main air pipe is used to supply air, which is then supplied to the tin bath through multiple branch air pipes. As the airflow weakens during the sequential supply process, the air supply is uneven at the supply points, making it difficult to control the stability within the tin bath.

[0005] Document CN 218879712 U discloses a device for controlling the flow rate of protective gas branch pipes in glass baths. The device includes a main protective gas pipeline and multiple gas branch pipes. A first port of each gas branch pipe is connected to the main protective gas pipeline, and a second port of each gas branch pipe is connected to a solder bath top cover. Each gas branch pipe is equipped with a first automatic regulating valve. Multiple temperature sensing components are installed on the solder bath top cover. The device also includes a central control system for receiving and processing real-time temperatures uploaded by the temperature sensing components and adjusting the first automatic regulating valves based on the real-time temperature. This discloses a method for efficiently controlling the heat distribution within the solder bath top cover based on the relationship between the central control system, temperature sensing components, and the first automatic regulating valves, thus solving the problem of heat imbalance within the solder bath top cover in existing technologies. However, controlling the heat uniformity within the solder bath top cover by adjusting the flow rate through temperature is limited by the installation position of the temperature sensing components and the position of the second port of each gas branch pipe.

[0006] Therefore, there is room for improvement in the temperature uniformity within the tin bath. Summary of the Invention

[0007] One of the technical problems that this disclosure aims to solve is the uneven supply of protective gas in the solder bath and the insufficient uniformity and stability of temperature in the solder bath.

[0008] To address the aforementioned technical problems, this disclosure provides an online control system for the protective gas flow rate in a cover glass production line, comprising:

[0009] Gas supply piping system;

[0010] The central control system is connected to the gas supply system.

[0011] The solder bath and the air supply system are installed on the solder bath.

[0012] The gas supply system includes a main gas pipe, a main gas pipe electric heating device, a main gas pipe control and regulating valve, a main gas pipe gas flow and temperature monitor, a main gas pipe top sealing structure, branch pipes, and a tank top temperature monitor. The main gas pipe comprises a first part and a second part, as well as an inner cavity at the intersection of the first and second parts. The outer surface of the first part is covered with the main gas pipe electric heating device, which is located above the solder bath. The second part extends into the solder bath, and the branch pipes are located within the second part of the main gas pipe. On the outer side, the main gas pipe control regulating valve and the main gas pipe gas flow and temperature monitor are installed on the inner cavity of the main gas pipe. The temperature monitor at the top of the tin bath is located near the branch pipe on the tin bath. The top sealing structure of the main gas pipe is located in the tin bath and seals the bottom of the second part of the main gas pipe. The central control system includes a main gas pipe electric heating control system and a gas supply flow control system. The main gas pipe electric heating control system is connected to the main gas pipe electric heating device to control the heating of the first part of the main gas pipe. The gas supply flow control system is connected to the main gas pipe control regulating valve to control the gas flow in the main gas pipe.

[0013] In some embodiments, the gas supply system further includes a bronchus vent, a bronchus control valve, and a bronchus gas flow monitor. The bronchus vent is located at the end of the bronchus facing the interior of the tin bath, the bronchus control valve is located at the end of the bronchus, and the bronchus gas flow monitor is located near the bronchus vent at the end of the bronchus.

[0014] In some embodiments, the central control system is provided with a signal analysis and processing system, which is connected to the main gas pipe electric heating control system and the gas supply flow control system respectively, and transmits processed signals to the main gas pipe electric heating control system and the gas supply flow control system.

[0015] In some embodiments, the gas supply system further includes a temperature display connected to a tank top temperature monitor.

[0016] In some embodiments, the central control system includes a signal receiving module configured to receive information transmitted by the main gas pipe gas flow and temperature monitor, the bronchial gas flow monitor, and the tank top temperature monitor, and transmit the information to the signal analysis and processing system.

[0017] In some embodiments, the main gas pipe gas flow and temperature monitor, the bronchial gas flow monitor, and the tank top temperature monitor are each equipped with a signal transmission module, and each signal transmission module transmits information to the signal receiving module of the central control system in real time.

[0018] In some embodiments, the main air pipe control valve and the bronchial air pipe control valve are each provided with a signal receiving device. The air supply flow control system is used to output processed signals to the signal receiving devices of the main air pipe control valve and the bronchial air pipe control valve to automatically adjust the valve opening of the main air pipe control valve and the bronchial air pipe control valve.

[0019] In some embodiments, multiple bronchial tubes are provided, and the multiple bronchial tubes are symmetrically arranged on the outside of the second part of the main air tube in the tin bath. Each bronchial tube is provided with a bronchial tube exhaust port, a bronchial tube control regulating valve and a bronchial tube gas flow monitor.

[0020] In some embodiments, multiple temperature monitors are provided at the top of the tin bath. The number of temperature monitors at the top of the tin bath is the same as the number of exhaust holes in the vent pipe. The front end of each temperature monitor at the top of the tin bath is located below the top of the tin bath adjacent to the exhaust hole of the corresponding vent pipe, and the distance between each temperature monitor at the top of the tin bath and the exhaust hole of the corresponding vent pipe is equal.

[0021] In some embodiments, a plurality of main air supply tubes are provided in the first part of the main air tube, and the plurality of main air supply tubes are wrapped in the main air tube electric heating device.

[0022] Through the above technical solution, the online control system for protective gas flow in the cover glass production line provided in this disclosure supplies gas through multiple main gas pipes to maintain a stable gas flow at each gas supply port; through monitoring the gas flow of each main gas pipe and branch gas pipe, and monitoring the temperature at each position on the top of the tin bath, the central control system automatically calculates and adjusts the gas flow rate, thereby realizing online monitoring of the protective gas flow rate; the protective gas is preheated by the electric heating device of the main gas pipe, and the temperature of the protective gas is monitored online to reduce the temperature fluctuation inside the tin bath. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a front view schematic diagram of the online control system for protective gas flow in a cover glass production line disclosed in this embodiment.

[0025] Figure 2 This is a top view schematic diagram of the online control system for protective gas flow in the cover glass production line disclosed in this embodiment;

[0026] Figure 3This is a partial front view of the central control system of the online control system for protective gas flow in the cover glass production line disclosed in this embodiment;

[0027] Figure 4 This is a cross-sectional schematic diagram of the main air supply tube and the main air tube electric heating device disclosed in the embodiments of this disclosure.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Gas supply pipe system; 1-1. Main gas pipe electric heating device; 1-2. Main gas pipe control regulating valve; 1-3. Main gas pipe gas flow and temperature monitor; 1-4. Main gas pipe top sealing structure; 1-5. Branch pipe; 1-6. Branch pipe exhaust port; 1-7. Branch pipe control regulating valve; 1-8. Branch pipe gas flow monitor; 1-9. Main gas pipe sealing ring; 1-10. Tank top temperature monitor; 1-11. Temperature display; 1-12. Main gas pipe; 1-13. Main gas pipe inner cavity gas supply tube; 2. Central control system; 2-1. Main gas pipe electric heating control system; 2-2. Gas supply flow control system. Detailed Implementation

[0030] The embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of this disclosure by way of example, but should not be used to limit the scope of this disclosure. This disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0031] Furthermore, the terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible margin of error. "Parallel" is not strictly parallel, but within the permissible margin of error. Terms such as "including" or "contains" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.

[0032] This disclosure provides an online control system for the flow of protective gas in a cover glass production line, such as... Figures 1 to 3As shown, it includes: a gas supply system 1, a central control system 2, and a solder bath 3. The gas supply system 1 is connected to the central control system 2 and is installed on the solder bath 3. The gas supply system 1 includes a main gas pipe 1-12, a main gas pipe electric heating device 1-1, a main gas pipe control regulating valve 1-2, a main gas pipe gas flow and temperature monitor 1-3, a main gas pipe top sealing structure 1-4, branch pipes 1-5, and a bath top temperature monitor 1-10. The main gas pipe 1-12 includes a first part and a second part of the main gas pipe, as well as the inner cavity of the main gas pipe at the intersection of the first part and the second part. The outer surface of the first part of the main gas pipe is covered with the main gas pipe electric heating device 1-1 and is located above the solder bath 3. The second part of the main gas pipe extends into the solder bath 3, and the branch pipes 1-5 are installed inside the solder bath 3. On the outer side of the second part of the main air pipe, the main air pipe control regulating valve 1-2 and the main air pipe gas flow and temperature monitor 1-3 are installed on the inner cavity of the main air pipe. The top temperature monitor 1-10 is installed on the tin bath 3 adjacent to the branch pipe 1-5. The top sealing structure 1-4 of the main air pipe is located in the tin bath 3 and seals the bottom end of the second part of the main air pipe. The central control system 2 includes the main air pipe electric heating control system 2-1 and the gas supply flow control system 2-2. The main air pipe electric heating control system 2-1 is connected to the main air pipe electric heating device 1-1 to control the heating of the first part of the main air pipe. The gas supply flow control system 2-2 is connected to the main air pipe control regulating valve 1-2 to control the gas flow in the main air pipe 1-12. The valve opening of the main air pipe control regulating valve 1-2 is adjusted by the gas supply flow control system 2-2.

[0033] Compared with the existing structure of supplying gas through a main gas pipe and multiple branch gas pipes to the tin bath, the protective gas flow online control system of the cover glass production line disclosed herein supplies gas through multiple main gas pipes 1-12 to maintain a stable gas flow at each gas supply port; by monitoring the gas flow of each main gas pipe 1-12 and branch gas pipe 1-5, and monitoring the temperature at each position on the top of the tin bath 3, the central control system 2 automatically calculates and adjusts the gas flow rate, thereby realizing online monitoring of the protective gas flow rate; the protective gas is preheated by the main gas pipe electric heating device 1-1, and the temperature of the protective gas is monitored online to reduce temperature fluctuations inside the tin bath 3.

[0034] In some embodiments, the air supply system 1 further includes a main air pipe sealing ring 1-9, through which the second part of the main air pipe is sealed to the solder bath 3. This design ensures the sealing between the solder bath 3 and the main air pipe 1-12.

[0035] In some embodiments, the main air pipe control regulating valve 1-2 includes a PLC device, which is controlled by the air supply flow control system 2-2 to adjust the valve opening of the main air pipe control regulating valve 1-2. This design enables automatic adjustment of the main air pipe control regulating valve 1-2.

[0036] In some embodiments, the gas supply system 1 further includes a bronchus vent 1-6, a bronchus control valve 1-7, and a bronchus gas flow monitor 1-8. The bronchus vent 1-6 is located at the end of the bronchus 1-5 facing the interior of the tin bath 3. The bronchus control valve 1-7 is located at the end of the bronchus 1-5. The opening degree of the bronchus valve is adjusted by adjusting the bronchus control valve 1-7, thereby regulating the gas flow rate of the bronchus 1-5. The bronchus gas flow monitor 1-8 is located near the bronchus vent 1-6 at the end of the bronchus 1-5 and monitors the gas flow rate of the bronchus 1-5. The bronchus control valve 1-7 includes a PLC device and is connected to the gas supply flow control system 2-2. The gas supply flow control system 2-2 controls the PLC device of the bronchus control valve 1-7 to adjust the valve opening degree of the bronchus control valve 1-7. This design enables the monitoring and control of the airflow of protective gas within bronchi 1-5.

[0037] In some embodiments, the gas supply system 1 further includes a temperature display 1-11, which is connected to the tank top temperature monitor 1-10 for displaying the real-time temperature. This design enables the real-time display of the temperature monitored by the tank top temperature monitor 1-10.

[0038] In some embodiments, the main gas pipe electric heating device 1-1 is a resistance heating device, and the electric heating temperature of the main gas pipe electric heating device 1-1 is adjusted and controlled by the main gas pipe electric heating control system 2-1. This design ensures that the gas temperature passing through the main gas pipe 1-12 remains stable.

[0039] In some embodiments, the central control system 2 is equipped with a signal analysis and processing system. This system is connected to the main gas pipe electric heating control system 2-1 and the gas supply flow control system 2-2, respectively, and transmits processed signals to both systems. The signal analysis and processing system is configured to analyze the gas flow and temperature information of the main gas pipe 1-12 transmitted by the main gas pipe gas flow and temperature monitor (1-3), the gas flow information of the branch pipe 1-5 transmitted by the branch pipe gas flow monitor (1-8), and the temperature information of the top of the tin bath 3 transmitted by the top temperature monitor 1-10. The system analyzes and compares the results with a preset temperature, converting the analysis into a processed signal. This processed signal is then transmitted to the main air pipe electric heating control system 2-1 and the air supply flow control system 2-2, and further transmitted to the main air pipe control regulating valve 1-2, the branch air pipe control regulating valve 1-7, and the main air pipe electric heating device 1-1. The PLC devices of the main air pipe control regulating valve 1-2 and / or the branch air pipe control regulating valve 1-7 convert the processed signal into a mechanical signal to control the valve opening of the main air pipe control regulating valve 1-2 and / or the branch air pipe control regulating valve 1-7, and to control the electric heating temperature of the main air pipe electric heating device 1-1. This design achieves automatic adjustment of the main air pipe control regulating valve 1-2, the branch air pipe control regulating valve 1-7, and the main air pipe electric heating device 1-1.

[0040] In some embodiments, the central control system 2 includes a signal receiving module (not shown), configured to receive information transmitted from the main gas pipe gas flow and temperature monitors 1-3, the branch gas pipe gas flow monitors 1-8, and the tin bath top temperature monitor 1-10, and transmit the information to a signal analysis and processing system. The information includes the gas flow and temperature information of the main gas pipes 1-12, the gas flow information of the branch gas pipes 1-5, and the tin bath top temperature information. This design enables real-time monitoring of the gas flow and temperature of the main gas pipes 1-12, the gas flow of the branch gas pipes 1-5, and the tin bath top temperature.

[0041] In some embodiments, the main gas pipe gas flow and temperature monitor 1-3, the branch gas flow monitor 1-8, and the tin bath top temperature monitor 1-10 are each equipped with a signal transmission module (not shown). Each of these signal transmission modules transmits information in real time to the signal receiving module of the central control system 2. The information includes the gas flow and temperature information of the main gas pipe 1-12, the gas flow information of the branch gas pipe 1-5, and the tin bath top temperature information. This design enables the real-time transmission of the gas flow and temperature information of the main gas pipe 1-12, the gas flow information of the branch gas pipe 1-5, and the tin bath top temperature information to the central control system 2.

[0042] In some embodiments, the main airway control valve 1-2 and the bronchial control valve 1-7 are each equipped with a signal receiving device (not shown). The valve openings of the main airway control valve 1-2 and the bronchial control valve 1-7 can be automatically adjusted by the air supply flow control system 2-2 outputting processed signals to these signal receiving devices. This design achieves automatic adjustment and control of the airflow in the main airway 1-12 and / or the bronchial control valve 1-5.

[0043] In some embodiments, multiple bronchus tubes 1-5 are provided, symmetrically arranged outside the second part of the main air tube within the tin bath 3. The number of bronchus tube exhaust holes 1-6 is the same as the number of bronchus tubes 1-5. Each bronchus tube 1-5 is provided with one bronchus tube exhaust hole 1-6, one bronchus tube control regulating valve 1-7, and one bronchus tube gas flow monitor 1-8. This design allows the protective gas to be evenly introduced into the tin bath 3 through the bronchus tubes 1-5.

[0044] In some embodiments, multiple temperature monitors 1-10 are provided, the number of which is the same as the number of vent holes 1-6. Each temperature monitor 1-10 is positioned below the top of the solder bath 3, adjacent to the front end of its corresponding vent hole 1-6, and the distance between each temperature monitor 1-10 and its corresponding vent hole 1-6 is equal. The temperature monitors 1-10 are used to monitor the temperature of different areas at the top of the solder bath 3. This design makes the detection results more accurate.

[0045] In some embodiments, each tank top temperature monitor 1-10 is equipped with a signal transmitting module (not shown), which transmits the corresponding temperature information in real time to the signal receiving module of the central control system 2. This design can monitor the temperature of each area at the top of the tin bath 3 in real time and feed it back to the central control system 2.

[0046] In some embodiments, the central control system 2 is configured to preset the gas supply flow rate and allowable deviation, the electric heating temperature and allowable deviation, and the standard temperature at the top of the tank and allowable temperature difference. The typical temperature deviation is ±3℃. After all standard values ​​are set, the online control system for the protective gas flow rate of the cover glass production line disclosed herein is put into operation. This design allows the control parameters of the online control system for the protective gas flow rate of the cover glass production line disclosed herein to be adjusted via the central control system 2.

[0047] In some embodiments, such as Figure 4As shown, the first part of the main air pipe is provided with multiple main air pipe lumen supply tubes 1-13, and the end of the first part of the main air pipe reverts to a single main air pipe structure. That is, the first part of the main air pipe is a single main air pipe structure with multiple adjacent main air pipe lumen supply tubes 1-13 within it. These multiple main air pipe lumen supply tubes 1-13 are enclosed within the main air pipe electric heating device 1-1. In some embodiments, the first part of the main air pipe has seven identical main air pipe lumen supply tubes 1-13, and these seven main air pipe lumen supply tubes 1-13 are enclosed within the main air pipe electric heating device 1-1. This design allows the protective gas within the main air pipe 1-12 to be redistributed and polymerized.

[0048] In some embodiments, a main gas pipe control regulating valve 1-2 and a main gas pipe gas flow and temperature monitor 1-3 are installed at the end of the first section of the main gas pipe to monitor the flow and temperature of the protective gas passing through the end of the first section of the main gas pipe. That is, the main gas pipe control regulating valve 1-2 and the main gas pipe gas flow and temperature monitor 1-3 are located at the end of the gas supply tube 1-13 within the main gas pipe cavity of the first section of the main gas pipe. The signal transmitting module of the main gas pipe gas flow and temperature monitor 1-3 transmits the protective gas temperature and flow information of the main gas pipe 1-12 to the signal receiving module of the central control system 2. This design can monitor the temperature and flow of the protective gas in the main gas pipe 1-12 in real time and feed it back to the central control system 2.

[0049] In some embodiments, a heating resistance wire (not shown) is provided inside the wall of each main gas supply tube 1-13, and the heating resistance wire can be connected to the main gas tube electric heating device 1-1. This design ensures the uniformity of the temperature of the protective gas in the main gas tube 1-12 and improves the preheating effect of the protective gas.

[0050] In some embodiments, the online control system for protective gas flow in the cover glass production line disclosed herein may include multiple sets of gas supply pipe systems 1. Depending on the width and length of the tin bath 3 and the requirements for temperature control accuracy, multiple sets of gas supply pipe systems 1 can be installed on the top of the tin bath 3. Each set of gas supply pipe systems 1 supplies gas through its own main gas pipe 1-12. All gas supply pipe systems 1 are jointly controlled by the central control system 2, and the electric heating length of each set of gas supply pipe systems 1 is consistent, facilitating temperature control of different areas on the top of the bath.

[0051] The automatic operation modes of the online control system for protective gas flow in the cover glass production line disclosed herein include:

[0052] The protective gas enters the gas supply system 1 through the main gas pipe 1-12 via the gas supply device (not shown). The protective gas in the first part of the main gas pipe is preheated by the main gas pipe electric heating device 1-1. After entering the main gas pipe cavity through the gas supply tube 1-13, the protective gas enters the end of the first part of the main gas pipe. The end of the first part of the main gas pipe is equipped with a main gas pipe control regulating valve 1-2 and a main gas pipe gas flow and temperature monitor 1-3 to monitor the flow and temperature of the protective gas passing through the end of the first part of the main gas pipe. The signal transmitting module of the main gas pipe gas flow and temperature monitor 1-3 transmits the temperature and flow information of the protective gas to the signal receiving module of the central control system 2.

[0053] After passing through the first part of the main air pipe, the protective gas is transferred to the second part of the main air pipe within the main air pipe cavity. In the second part of the main air pipe, the protective gas is evenly distributed through the branch pipes 1-5 and discharged into the tin bath 3 through the branch pipe exhaust holes 1-6. The branch pipe control regulating valve 1-7 at the end of the branch pipe 1-5 controls the opening of the branch pipe valve to regulate the air flow of the branch pipe 1-5. The branch pipe gas flow monitor 1-8 monitors the air flow of the branch pipe 1-5 and transmits the air flow information of the branch pipe 1-5 to the signal receiving module of the central control system 2 through the signal transmitting module of the branch pipe gas flow monitor 1-8. The tank top temperature monitor 1-10 monitors the temperature of the area in front of the branch pipe exhaust hole 1-6 and transmits the temperature information to the signal receiving module of the central control system 2. Moreover, the temperature display 1-11 can display the real-time temperature.

[0054] The signal receiving module of the central control system 2 simultaneously analyzes and processes the temperature, airflow information of each bronchus, and main bronchus gas temperature information at the same time through the signal analysis module, comparing them with the set temperature standard. It analyzes the temperature difference in the area in front of the bronchus exhaust ports 1-6. If all data analysis is within the preset control range, no processing is performed, and the next time period information is analyzed synchronously. If the temperature difference in the area in front of the bronchus exhaust ports 1-6 is greater than the preset value, a processing signal is generated and transmitted to the corresponding bronchus control regulating valves 1-7 to increase or decrease the valve opening and adjust the airflow. After adjustment, the data from the next time period is compared to determine if there is an improving trend, until the temperature stabilizes.

[0055] In the case of multiple gas supply pipe systems 1, the spacing between each gas supply pipe system 1 is equal. If the temperature difference in the top area of ​​the tin bath 3 monitored by the corresponding top temperature monitors 1-10 of different gas supply pipe systems 1 with the same spacing is too large, the central control system 2 generates a processing signal and sends the processing signal to the corresponding main gas pipe control regulating valve 1-2 to adjust the valve opening and regulate the gas flow of the main gas pipe 1-12, thereby stabilizing the temperature.

[0056] In the preset mode of the central control system 2, if the temperature difference value of the top area of ​​a certain gas supply pipe system 1 is too large, the central control system 2 will send a processing signal to the corresponding main gas pipe electric heating device 1-1 to adjust the preheating temperature of the protective gas, thereby quickly adjusting the temperature difference.

[0057] The online control system for protective gas flow in the cover glass production line disclosed herein can be switched to manual mode under special circumstances. The electric heating temperature of each main gas pipe 1-12 can be manually adjusted through the main gas pipe electric heating control system 2-1, and the valve opening of each main gas pipe 1-12 and branch gas pipe 1-5 can also be adjusted through the gas supply flow control system 2-2. This allows for comparison of reasonable temperature and gas flow management standards during production line changeovers and process adjustments, thereby improving product quality.

[0058] The protective gas flow online control system disclosed herein supplies gas through multiple main gas pipes 1-12 to maintain a stable gas flow at each gas supply port; by monitoring the gas flow of each main gas pipe 1-12 and branch gas pipe 1-5, and monitoring the temperature at each position on the top of the tin bath 3, the central control system 2 automatically calculates and adjusts the gas flow rate, thereby achieving online monitoring of the protective gas flow rate; the protective gas is preheated by the main gas pipe electric heating device 1-1, and the temperature of the protective gas is monitored online to reduce temperature fluctuations within the bath.

[0059] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0060] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner.

Claims

1. A cover glass production line protective gas flow on-line control system, characterized by, The utility model relates to a kind of gas supply pipe systems, including: Gas supply pipe system (1); Central control system (2), which is connected with the gas supply pipe system (1); Tin tank (3), and the gas supply pipe system (1) is arranged on the tin tank (3); The gas supply pipe system (1) includes main gas pipe (1-12), main gas pipe electric heating device (1-1), main gas pipe control regulating valve (1-2), main gas pipe gas flow and temperature monitor (1-3), main gas pipe top welding structure (1-4), branch gas pipe (1-5), tank top temperature monitor (1-10), wherein the main gas pipe (1-12) includes main gas pipe first part and main gas pipe second part and the main gas pipe first part and the main gas pipe second part intersection main gas pipe inner cavity, the outer surface of the main gas pipe first part is wrapped with the main gas pipe electric heating device (1-1) and is located above the tin tank (3), the main gas pipe second part is inserted into the tin tank (3) and the branch gas pipe (1-5) is arranged on the outside of the main gas pipe second part in the tin tank (3), the main gas pipe control regulating valve (1-2) and the main gas pipe gas flow and temperature monitor (1-3) are arranged on the main gas pipe inner cavity, the tank top temperature monitor (1-10) is arranged on the tin tank (3) adjacent to the branch gas pipe (1-5), and the main gas pipe top welding structure (1-4) is located in the tin tank (3) and seals the bottom end of the main gas pipe second part;The central control system (2) includes main gas pipe electric heating control system (2-1) and gas supply flow control system (2-2), the main gas pipe electric heating control system (2-1) is connected with the main gas pipe electric heating device (1-1) to control the heating of the main gas pipe first part, and the gas supply flow control system (2-2) is connected with the main gas pipe control regulating valve (1-2) to control the gas flow in the main gas pipe (1-12); The gas supply pipe system (1) further includes branch gas pipe exhaust hole (1-6), which is arranged on the end of the branch gas pipe (1-5) facing the inside of the tin tank (3); The branch gas pipe (1-5) is provided with a plurality of branch gas pipes (1-5), and the plurality of branch gas pipes (1-5) are symmetrically arranged outside the main gas pipe second part in the tin tank (3); A plurality of main gas pipe cavity internal gas supply small pipes (1-13) are arranged in the main gas pipe first part, the end of the main gas pipe first part returns to a main gas pipe structure, and the plurality of main gas pipe cavity internal gas supply small pipes (1-13) are wrapped in the main gas pipe electric heating device (1-1);A heating resistance wire is arranged in the pipe wall of each main gas pipe cavity internal gas supply small pipe (1-13), and the heating resistance wire is connected with the main gas pipe electric heating device (1-1).

2. The cover glass production line protective gas flow on-line control system according to claim 1, characterized by, The gas supply pipe system (1) further comprises a bronchus control regulating valve (1-7) arranged at the end of the bronchus (1-5) and a bronchus gas flow monitor (1-8) arranged at the end of the bronchus (1-5) adjacent to the bronchus exhaust hole (1-6).

3. The cover glass production line protective gas flow on-line control system according to claim 1, characterized by, The central control system (2) is provided with a signal analysis processing system, which is connected with and transmits processing signals to the main gas pipe electric heating control system (2-1) and the gas flow control system (2-2).

4. The cover glass production line protective gas flow on-line control system according to claim 1, characterized by, The gas supply pipe system (1) further comprises a temperature indicator (1-11) connected with the tank top temperature monitor (1-10).

5. The cover glass production line protective gas flow on-line control system according to claim 2, characterized by, The central control system (2) comprises a signal receiving module configured to receive information transmitted by the main gas pipe gas flow and temperature monitor (1-3), the bronchus gas flow monitor (1-8) and the tank top temperature monitor (1-10) and transmit the information to the signal analysis processing system.

6. The cover glass production line shielding gas flow on-line control system according to claim 5, characterized by, The main gas pipe gas flow and temperature monitor (1-3), the bronchus gas flow monitor (1-8) and the tank top temperature monitor (1-10) are each provided with a signal transmitting module, each signal transmitting module transmitting information to the signal receiving module of the central control system (2) in real time.

7. The cover glass production line shield gas flow on-line control system according to claim 2, characterized by, The main gas pipe control regulating valve (1-2) and the bronchus control regulating valve (1-7) are each provided with a signal receiving device, and the gas flow control system (2-2) is used to output processing signals to the signal receiving devices of the main gas pipe control regulating valve (1-2) and the bronchus control regulating valve (1-7) to automatically adjust the valve opening degree of the main gas pipe control regulating valve (1-2) and the bronchus control regulating valve (1-7).

8. The cover glass production line shield gas flow on-line control system according to claim 2, characterized by, Each of the bronchus (1-5) is provided with one bronchus exhaust hole (1-6), one bronchus control regulating valve (1-7) and one bronchus gas flow monitor (1-8).

9. The cover glass production line shielding gas flow on-line control system according to claim 8, characterized by, The tank top temperature monitor (1-10) is provided in multiple, the number of the tank top temperature monitor (1-10) is the same as the number of the bronchus exhaust hole (1-6), each of the tank top temperature monitor (1-10) is arranged below the tank top of the tin tank (3) adjacent to the front end of the corresponding bronchus exhaust hole (1-6), and the spacing between each of the tank top temperature monitor (1-10) and the corresponding bronchus exhaust hole (1-6) is equal.

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