A float liquid crystal display glass flow control method and flow channel structure thereof

Abstract

This invention discloses a flow control method and flow channel structure for float glass. Based on comprehensive data collection of molten glass weight within the flow channel, manual sampling and weighing data, and relevant process parameters of the platinum channel, flow channel, and tin bath, the method uses big data analysis of the control system to derive the relationship between glass flow rate and various process parameters. By precisely controlling these process parameters, accurate control of glass flow rate during forming is achieved, effectively reducing the difficulty of adjusting glass thickness and thickness variation. This avoids the direct correlation between the molten glass level in the platinum channel and the flow channel gate opening in the production of high-generation float glass, which is beneficial to the process stability of the platinum channel and even the furnace. It reduces reliance on operator experience and alleviates the workload of operators. In the early stages of abnormal situations, timely emergency handling can be carried out to reduce production losses. It achieves automatic control, improving the automation and intelligence level of the production line.

Description

Technical Field

[0001] The invention relates to the technical field of glass production, and in particular to a flow control method for float liquid crystal display glass and a flow channel structure thereof. Background Art

[0002] The thickness of common LCD glass on the market is generally around 0.5mm, which belongs to the category of ultra-thin glass. However, the quality requirements of LCD glass are not only strict control of thickness, but more importantly, factors such as thickness and thickness difference directly affect the optical properties of glass such as light transmittance and reflectivity. For glass used in LCD devices, the adverse effects from optical properties are very fatal. Therefore, glass thickness and thickness difference are the core control indicators in the production of LCD glass. Whether the glass flow rate (also known as the pulling amount) during the molding process is stable has the most direct impact on the glass thickness and thickness difference.

[0003] The method used in China to produce medium and small generation LCD glass is mainly the overflow down-draw method, which is characterized by a short length of the forming and annealing area (only about three meters). After cutting, it can be weighed online immediately and the data can be fed back to the platinum channel. The platinum channel can timely adjust the temperature of the cooling section and the feeding section according to the change of glass weight, and then accurately control the flow rate by changing the glass viscosity through temperature. At present, the glass flow control accuracy of some manufacturers has reached within ±0.5kg / h.

[0004] In the production process of float glass for high-generation LCD displays, which has just been broken through in my country in recent years, due to the large glass flow rate during production, if the mainstream tubular feeding method in the overflow down-draw method is adopted, the diameter of the feeding section needs to be increased. The disadvantage is that the temperature difference between the glass liquid in the center and the edge of the feeding section will be widened, making it difficult to heat the glass liquid evenly, and it is impossible to achieve the purpose of accurately controlling the flow rate by regulating the temperature. Therefore, in the production process of float glass for high-generation LCD displays, the feeding section of the platinum channel is removed, and the flow channel structure commonly used in the production of ordinary float glass is adopted. The glass liquid enters the tin bath from the cooling section of the platinum channel through the flow channel. The glass flow control means are: the regulating gate of the lifting flow channel is used for coarse adjustment, and the temperature control of the cooling section is used for fine adjustment.

[0005] However, due to the large difference between the float glass production process and the overflow down-draw method, it is impossible to achieve online weighing of glass plates, and glass plates can only be weighed by manual sampling; in addition, the total length of the tin bath and annealing furnace is more than 100 meters, and the data generated by manual sampling weighing will lag by one or two hours. Therefore, in the existing float glass production process, there is a situation where the amount of data feedback on the weight of the glass plate is small and the timeliness is poor, which leads to poor glass flow control accuracy in the production of float glass for high-generation LCD displays, and ultimately makes it more difficult to control the thickness and thickness difference of the glass. Summary of the invention

[0006] The technical problem solved by the present invention is that in the existing float glass production process, the amount of data feedback on the weight of the glass plate is small and the timeliness is poor, which leads to poor glass flow control accuracy in the production of float glass for high-generation liquid crystal display, and ultimately increases the difficulty of controlling the glass thickness and thickness difference.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A flow channel structure for producing float liquid crystal display glass, comprising:

[0009] A flow channel assembly, the flow channel assembly comprising a flow channel and a top cover, the flow channel is fixedly arranged on a support frame, the top cover is arranged outside the flow channel, one end of the top cover is provided with a feeding section for connecting to a platinum channel, and the other end is fitted with a tin bath, the top cover and the flow channel enclose a closed space as a glass liquid flow channel, the width of the glass liquid flow channel is larger than the width of the feeding section of the platinum channel for feeding, and smaller than the width of the tin bath, a gap is arranged between the top cover and the flow channel, and a mounting position of an adjusting gate is reserved at the top of the top cover;

[0010] A heating component, wherein the heating component is used to heat the glass liquid in the flow channel component;

[0011] A control component, the control component includes a plurality of information acquisition sensors, a weighing sensor and a control system, the information acquisition sensor is used to collect temperature and pressure information in the glass liquid flow channel and transmit it to the control system; the weighing sensor is arranged between the base and the support frame, the weighing sensor is used to collect weight information data of the glass liquid above the flow channel and upload it to the control system, the control system is used to analyze the data information collected by the information acquisition sensor and the weighing sensor, and control the operation of the flow channel structure according to the analysis results and the preset program.

[0012] In one embodiment of the present invention, the flow channel includes a bottom wall, a front wall and side walls, wherein the front wall and side walls are vertically fixed to the front end and both sides of the bottom wall, a lip brick is arranged at the other end of the bottom wall, and a heat insulation baffle is arranged below the lip brick.

[0013] In one embodiment of the present invention, the heating assembly includes a silicon carbon rod and an electrode, wherein the electrode is disposed on a side wall of the flow channel, and the silicon carbon rod is detachably mounted on the side wall of the top cover.

[0014] In one embodiment of the present invention, the information acquisition sensor includes a thermocouple, a pressure sensor, and a liquid level meter.

[0015] In one embodiment of the present invention: a plurality of the thermocouples are respectively arranged at the feeding section, the bottom of the flow channel, and the top of the top cover, and the pressure sensor is arranged on the top cover and below the flow channel.

[0016] In one solution of the present invention: a cold air outlet is provided below the flow channel.

[0017] In one solution of the present invention: a plurality of ventilation pipes are arranged on the top cover, the ventilation pipes are connected to a nitrogen source, and a return air port is opened at the bottom of the top cover.

[0018] In one embodiment of the present invention: the front end of the flow channel assembly is tightly connected to the platinum channel via a connecting groove; the platinum channel comprises a cooling section and a feeding section that are fixedly connected; the feeding section is a flat rectangular structure; the cross-sectional area of ​​the feeding section matches the longitudinal cross-sectional area of ​​the cooling section; the lower end of the feeding section is tightly connected to the connecting groove via a funnel structure; the connecting groove is a flat rectangular structure.

[0019] In one solution of the present invention: a heating cover plate is arranged on the top of the feeding section, and an observation hole is opened on the heating cover plate.

[0020] A method for controlling the flow rate of a float liquid crystal display glass comprises the following steps:

[0021] S1: Heating stage:

[0022] S11: Adjust the gate plate down until it touches the bottom of the flow channel. When the gate plate is adjusted down to touch the bottom of the flow channel, ensure that the flow channel is not stressed;

[0023] S12: introducing nitrogen gas at room temperature into the glass liquid flow channel from the vent pipe;

[0024] S13: The control system sends a command to the heating component to heat the glass liquid flow channel through the heating component;

[0025] S14: according to the change of the flow channel temperature, the temperature of the nitrogen gas introduced is increased simultaneously until the temperature in the glass liquid flow channel reaches the process requirement;

[0026] S15: heating the platinum channel for feeding materials until the temperature reaches the process requirements;

[0027] S2: Liquid level establishment stage:

[0028] S21: before the glass liquid in the platinum channel enters the feeding section, the data displayed by the weighing sensor is reset to zero;

[0029] S22: When the glass liquid enters the feeding section, the power of the feeding section is turned to the minimum, so that the glass liquid in the feeding section reaches the designated position as soon as possible. During this process, the control system calculates the glass liquid flow rate at the connecting tank under the current working condition based on the weight fed back by the weighing sensor using big data analysis technology;

[0030] S23: As the glass liquid in the feeding section is fully filled, the heating power of the cooling section and the feeding section is gradually increased. In this process, the control system preliminarily calculates the relationship between various process parameters and the glass liquid flow rate of the connecting tank based on the data fed back by the weighing sensor, the thermocouples of the cooling section and the feeding section, and the power regulator of the cooling section and the feeding section using the big data analysis technology;

[0031] S24: When the glass liquid covers the electrode, the electrode is started to heat the glass liquid;

[0032] S25: Use a liquid level meter to monitor the liquid glass level in the flow channel until the liquid level reaches a target value;

[0033] S3: Leading stage:

[0034] S31: When the flow tank liquid level reaches the target value, the control system issues a command to gradually raise the height of the regulating gate through the lifting mechanism;

[0035] S32: After the glass liquid enters the tin bath, the control system calculates the flow rate of the glass liquid entering the tin bath according to the weight change fed back by the weighing sensor and the glass liquid flow rate at the connecting tank preliminarily calculated in the liquid level establishment stage;

[0036] S33: gradually increase the opening of the regulating gate until the flow rate of the glass liquid entering the tin bath reaches the target value. In this process, the control system preliminarily calculates the relationship between each process parameter and the flow rate based on the flow rate of the glass liquid in the connecting tank, the temperature data fed back by the thermocouple in the flow channel, the electrode heating power, the silicon carbon rod heating power, the pressure fed back by the flow tank pressure sensor, the liquid level detected by the liquid level meter, and the opening of the regulating gate (4) using big data analysis technology;

[0037] S34: tinning bath edge drawing machine;

[0038] S4: Formal production stage: The database of the control system is continuously accumulated and improved with the collected data. Through big data analysis and correction of the relationship between various data and the flow rate and the glass liquid flow rate of the connecting tank, the flow rate and the glass liquid flow rate of the connecting tank are accurately calculated.

[0039] A float liquid crystal display glass flow control method and flow channel structure according to the present invention have at least one of the following technical effects:

[0040] This application fully collects the weight of the glass liquid in the flow channel, the manual sampling weighing data, and the platinum channel, flow channel, and tin bath related process parameters (temperature, glass liquid level, gate opening, etc.). The relationship between the glass flow rate and each process parameter is analyzed through the control system big data, and then the glass flow rate is accurately controlled during molding by accurately controlling the relevant process parameters, effectively reducing the difficulty of regulating the glass thickness and thickness difference. Structurally, the direct correlation between the liquid level of the platinum channel glass liquid and the flow channel gate opening in the production of high-generation float glass for liquid crystal displays is avoided, which is beneficial to the process stability of the platinum channel and even the kiln. It reduces the dependence on the experience of the operator and reduces the work intensity of the operator. In the early stage of abnormal situations, emergency treatment can be carried out in time to reduce production losses. Automatic control is achieved to improve the automation and intelligence level of the production line.

[0041] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0043] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0044] Figure 2 is a schematic structural diagram of a flow channel assembly of the present invention;

[0045] Figure 3 It is a schematic diagram of the connection structure of the heating component of the present invention;

[0046] Figure 4 It is a schematic structural diagram of the vent pipe located at the end of the flow channel of the present invention;

[0047] Figure 5 It is a schematic diagram of the structure of the platinum channel of the present invention.

[0048] In the figure: 1. flow channel; 2. top cover; 3. tin bath; 4. adjusting gate; 5. controller; 6. weighing sensor; 7. heat insulation baffle; 8. silicon carbon rod; 9. electrode; 10. thermocouple; 11. pressure sensor; 12. liquid level meter; 13. cold air outlet; 14. ventilation pipe; 15. cooling section; 16. feeding section; 17. connecting groove; 18. heating cover; 19. return air outlet. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0051] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0052] See also Figure 1-4The present invention is a flow channel structure for the production of float liquid crystal display glass, including a flow channel component, a heating component and a control component. The flow channel component includes a flow channel 1 and a top cover 2. The flow channel 1 may include a bottom wall, a front wall and a side wall. The front wall is vertically fixed at the front end of the bottom wall (i.e., the feeding end), and the side walls are vertically fixed at both sides of the bottom wall. A lip brick is provided at the other end of the bottom wall for transition, so that the glass liquid flows out smoothly. The flow channel 1 is arranged on a support frame, and the support frame may be a steel structure for supporting and fixing. A heat insulation baffle 7 may be provided at the bottom position, and the heat insulation baffle 7 is provided to prevent the high temperature in the tin bath 3 from burning the steel structure. The top cover 2 is arranged outside the flow channel 1. One end of the top cover 2 is provided with a feeding section 16 for connecting the platinum channel, and the other end is fitted with the tin bath 3, that is, the top cover 2 and the flow channel 1 enclose a relatively closed space as a glass liquid flow channel for the glass liquid to circulate, while reducing the influence of external environmental changes on the flow channel working conditions. The width dimension of the glass liquid flow channel is larger than the width dimension inside the feeding section 16, and smaller than the width dimension of the tin bath 3, to ensure that the glass liquid is in a state suitable for flattening, unfolding and subsequent molding after flowing into the tin bath 3. There is a gap setting between the top cover 2 and the flow channel 1, that is, the two are relatively independent, and a gap is formed between the two to ensure that there will be no interference when relative displacement occurs. The top of the top cover 2 is reserved with installation positions for the regulating gate 4 and the safety gate. The regulating gate 4 is used to adjust the flow rate of the glass liquid, and the safety gate is located behind the regulating gate 4 (in the flow direction of the glass liquid), and is used to control the flow rate of the glass liquid when the regulating gate 4 is replaced.

[0053] See also Figure 1-4 In one embodiment of the present invention, the heating component is used to heat the glass liquid in the flow channel component. The heating component includes a silicon carbon rod 8 and an electrode 9. The electrode 9 is arranged on the side of the flow channel 1. The electrode 9 is mainly responsible for heating the glass liquid in the flow channel. The advantage of heating by electrode 9 is that the glass liquid can be heated evenly. The silicon carbon rod 8 can be detachably mounted on the side wall of the top cover 2. The silicon carbon rod 8 is arranged along the width direction of the top cover 2. A plurality of silicon carbon rods 8 are evenly arranged along the flow direction of the glass liquid. During production, there is a certain distance between the silicon carbon rod 8 and the glass liquid surface in the flow channel; when the silicon carbon rod 8 is damaged, it can be pulled out and replaced. The silicon carbon rod 8 mainly heats the spatial temperature in the flow channel, maintains the temperature of the surface glass liquid, and avoids the formation of a temperature difference between the upper and lower layers of glass liquid, thereby affecting the calculation and control of the glass liquid flow rate due to inconsistent viscosity.

[0054] See also Figure 1-4In one embodiment of the present invention, the control component includes a plurality of information acquisition sensors, a weighing sensor 6 and a control system 5. The information acquisition sensor is used to collect the temperature and pressure information in the glass liquid flow channel and transmit it to the control system 5; the weighing sensor 6 is arranged between the base and the support frame, and the weighing sensor 6 is connected to the controller 5. The weighing sensor 6 is used to collect the weight information data of the glass liquid above the flow channel 1 and upload it to the controller 5. The base can be a supporting structure directly built on the ground. The information acquisition sensor can be a thermocouple 10, a pressure sensor 11, a liquid level meter 12, etc., wherein the thermocouple 10 can be arranged at the feeding section 16, the bottom of the flow channel 1, and the top of the top cover 2, respectively, for collecting temperature information at different positions, wherein the thermocouple 10 of the top cover 2 is mainly used to monitor the spatial temperature of the flow channel 1. At the same time, a temperature sensor can be arranged on the base to monitor the ambient temperature where the weighing sensor 6 is located to ensure that the ambient temperature is stable and controllable. Furthermore, a cold air port 13 may be provided below the flow channel 1 for introducing cooling air, so as to ensure the operating temperature of the weighing sensor 6 and prevent the weighing sensor 6 from being damaged due to long-term operation in a high-temperature environment. The pressure sensor 11 may be provided on the top cover 2 and below the flow channel 1. When the pressure sensor 11 is provided on the top cover 2, a pressure-taking pipe may be provided on the top cover 2, and the pressure-taking pipe is connected to the pressure sensor 11, and is mainly used to detect the pressure of the flow channel 1. The pressure sensor 11 below the flow channel 1 mainly monitors the environmental pressure of the space below the flow channel 1. A liquid level gauge is installed on the side wall of the top cover 2, which can be used to obtain the liquid level information of the glass liquid in the flow channel.

[0055] See also Figure 1-4In one embodiment of the present invention, the controller 5 is used to analyze the data information collected by the information acquisition sensor and the weighing sensor 6, and control the operation of the flow channel structure according to the analysis results and the preset program. The control system 5 may include an industrial computer, a power regulator, a PLC, etc. The industrial computer can receive data fed back by the thermocouple 10, the liquid level meter, the weighing sensor 6, the pressure sensor 11, the power regulator, the PLC, etc., and manual weighing data, etc. can also be entered. After these data are analyzed and processed by the industrial computer, instructions can be sent to the corresponding controller 5 such as the power regulator and the PLC. The equipment connected to the power regulator is the cooling section 15, the feeding section 16, the electrode 9 and the silicon carbon rod 8, which mainly controls its heating power to ensure the stability of the glass liquid temperature. The role of the PLC: ① accurately control the lifting and lowering of the regulating gate 4 and the safety gate; ② accurately control the inflow of high-temperature nitrogen and cooling air and the discharge of gas in the return air port 19 to ensure that the pressure in the flow channel is controlled. The process of big data analysis by the industrial computer may include: retrieving online weighing data and manual sampling weighing data obtained by the weighing sensor 6 under the same working conditions (i.e., the same or similar parameters such as temperature and pressure) from the database, and the data should also include the time information of obtaining the data (i.e., the weighing time), respectively generating weighing data curves for the above two groups of data, and then fitting the curves of the group data, and deducing the delay time coefficient t between the weighing sensor 6 obtaining the glass ribbon information and the manual weighing corresponding point information according to the change law of the curve (such as inflection point, peak, trough, etc.); then retrieving and analyzing the influence of parameters such as temperature, pressure, glass liquid level, gate opening on the glass liquid based on the delay time coefficient t (such as the influence of the parameter change obtained at the manual weighing point after at least time t after a certain parameter changes), and finally generating a glass liquid flow control model through a large amount of data analysis, and associating the weighing sensor 6, temperature, glass liquid flow, etc. through the glass liquid flow control model. Then, precise control of the flow of glass liquid is achieved based on the model. In the subsequent production, data is continuously collected and used to input the model for parameter adjustment. At the same time, the subsequent collected data is analyzed to verify the effectiveness of the control model and continuously improve the correlation between the parameters in the control model to ensure the accuracy and effectiveness of the model.

[0056] See also Figure 1-4In one embodiment of the present invention, a plurality of vent pipes 14 are provided on the top cover 2, and the vent pipes 14 are connected to a nitrogen source. The vent pipes 14 are provided around the top cover 2, on the top, and at the tail of the flow channel 1. When the vent pipe 14 is provided on the top cover 2, it is a protective air hole, and when the vent pipe 14 is provided at the tail of the flow channel 1, it is a 0-Bay. A return air port 19 is provided at the bottom of the top cover, and a solenoid valve can be provided at the return air port 19 to control the opening and closing. The return air port 19 mainly removes the high-temperature nitrogen entering the flow channel and the cooling air below the flow channel 1 to maintain the pressure balance of the flow channel. High-temperature nitrogen is introduced into the protective air hole and the 0-Bay to ensure that the flow channel 1 is at a slightly positive pressure. The purpose of passing high-temperature nitrogen is: to prevent hydrogen in the tin bath 3 from entering the flow channel before the lead plate is introduced, and to prevent the platinum or platinum-rhodium alloy in the feeding section 16 from being damaged by reducing gas; because the use conditions of electrodes of different materials are different (such as: molybdenum electrode 9 will be damaged by oxidizing atmosphere, tin oxide electrode 9 will be damaged by reducing atmosphere), passing nitrogen can ensure the atmosphere in the flow channel, which is suitable for the use of different types of electrodes 9; stabilize the internal pressure of the flow channel and reduce the influence of the external environment. The protective pores, thermocouples 10, liquid level gauges, silicon carbon rods 8, electrodes 9, 0-Bay and other parts leading out of the top cover 2 all have a certain gap with the top cover 2 to ensure that there will be no interference when relative displacement occurs; to ensure that the flow channel environment is not affected by the outside world, the outside of the gap will be sealed with flexible insulation materials such as insulation cotton.

[0057] See also Figure 1-5In one embodiment of the present invention, the front end of the flow channel assembly is sealed and connected to the platinum channel through a connecting groove 17, and the function of the connecting groove 17 is to guide the glass liquid into the flow channel 1. The platinum channel includes a fixedly connected cooling section 15 and a feeding section 16, and the two ends of the cooling section 15 are respectively provided with power-on flanges. The power-on flanges can form a heating circuit after connecting to the power supply for heating the glass liquid. The feeding section 16 is a flat rectangular parallelepiped structure, and the cross-sectional area of ​​the feeding section 16 matches the longitudinal cross-sectional area of ​​the cooling section 15, that is, the width dimension of the feeding section 16 (the width direction is perpendicular to the paper surface) is greater than the diameter dimension of the cooling section 15, ensuring that the glass liquid flow rate of the feeding section 16 meets the design flow rate of the production line. The lower end of the feeding section 16 is closed and connected to the connecting groove 17 through a funnel structure. The connecting groove 17 is a flat rectangular parallelepiped structure, and its size is smaller than that of the feeding section 16. The material of the feeding section 16 and the connecting groove 17 can be the same as the cooling section 15 of the platinum channel, which is platinum or platinum-rhodium alloy. The purpose of designing the feeding section 16 to be flat is to allow the glass liquid to be heated evenly, to make the viscosity of the glass liquid tend to be consistent, so that the flow rate of the glass liquid has good uniformity, and to facilitate stable flow; the funnel-shaped design of the lower part is to better form a flow difference between the inflow and outflow of the glass liquid in the feeding section 16 when the platinum channel establishes the liquid level at the initial stage of production, so that the glass liquid has enough amount to fill the feeding section 16. Further, the top of the feeding section 16 and the connection position of the feeding section 16 and the connecting groove 17 are each provided with an electric flange to form a complete heating circuit for heating the glass liquid. Further, a heating cover plate 18 can be provided on the top of the feeding section 16. The heating cover plate 18 is provided to reduce heat loss, so that the temperature of the feeding section 16 is kept stable. The heating cover plate 18 can be made of a refractory material with high strength and high temperature resistance, and its outer surface is covered with platinum or platinum-rhodium alloy skin, and then it can be heated by powering on. An observation hole is provided on the heating cover plate 18 for observing or measuring the glass liquid level in the feeding section 16; the observation hole is filled and sealed with a heat-insulating material when not in use.

[0058] See also Figure 1 The present invention also provides a float liquid crystal display glass flow control method, comprising the following steps:

[0059] Debugging phase before formal production

[0060] S1: Heating stage

[0061] S11: The regulating gate 4 is lowered until it touches the bottom of the flow channel 1, and the safety gate is lowered to an appropriate position, and the safety gate does not touch the glass liquid, that is, the height of the safety gate is higher than the height of the regulating gate 4, so that the safety gate does not affect the regulating control of the glass liquid by the regulating gate 4, and can be lowered to play a regulating role when necessary. When the regulating gate 4 is lowered to touch the bottom of the flow channel 1, it is necessary to ensure that the flow channel 1 is not subjected to force (which can be judged by the change of the weighing sensor 6 and the mechanical position of the regulating gate 4).

[0062] S12: nitrogen gas at room temperature is introduced into the glass liquid flow channel from the vent pipe 14 (i.e., the protective air hole, 0-Bay).

[0063] S13: The temperature rise rate of the glass liquid flow channel is set on the control system 5 (industrial computer), and after receiving the instruction from the industrial computer, the power regulator of the silicon carbon rod 8 gradually increases the heating power of the silicon carbon rod 8. During this period, the industrial computer can issue instructions to the power regulator of the silicon carbon rod 8 according to the temperature data fed back by the thermocouple 10, and timely correct the power of the silicon carbon rod 8 to ensure that the flow channel is heated as planned.

[0064] S14: According to the change of flow channel temperature, the temperature of the nitrogen gas introduced must be increased in time until it reaches the normal operating temperature. The amount of nitrogen used is adjusted according to the cooling air volume to ensure that the flow channel 1 is in a positive pressure environment; the cooling air volume is regulated according to the temperature of the weighing sensor 6 detected by the temperature sensor. The industrial computer issues instructions to the relevant actuators to regulate the cooling air volume, the amount of nitrogen used, and the exhaust volume of the return air port 19 based on the temperature of the weighing sensor 6, the pressure sensor 11 detecting the pressure of the flow channel 1, and the pressure sensor 11 below the flow channel 1.

[0065] S15: The feeding section 16 is heated according to a conventional platinum channel heating program.

[0066] S2: Liquid level establishment stage: In this process, the pressure in the flow channel 1 should be controlled to be slightly positive, and the temperature at the weighing sensor 6 should also be controlled within an appropriate range. The control method is the same as step S14. Due to the influence of factors such as furnace pressure and liquid level, glass liquid temperature and flow channel 1 pressure, as well as the limitations of short production time and small amount of accumulated data, the accuracy of the calculated glass liquid flow rate of the connecting groove 17 is relatively poor at this time. As the data increases, the calculation of the glass liquid flow rate of the connecting groove 17 will become more and more accurate, and the control of the glass liquid flow rate of the connecting groove 17 will become more and more precise.

[0067] S21: Before the glass liquid in the platinum channel enters the feeding section 16, the display data of the weighing sensor 6 is reset to zero.

[0068] S22: When the glass liquid enters the feeding section 16, the power of the feeding section 16 is turned to the minimum, so that the glass liquid in the feeding section 16 reaches the designated position as soon as possible. During this period, according to the feedback data of the weighing sensor 6, the industrial computer can calculate the glass liquid flow rate (unit: kg / h) of the connecting tank 17 under the current working condition.

[0069] S23: As the glass liquid in the feeding section 16 is filled in place, the heating power of the cooling section 15 and the feeding section 16 is gradually increased. At this time, the industrial computer can calculate the relationship between each process parameter and the flow rate of the glass liquid in the connecting tank 17 according to the data fed back by the weighing sensor 6, the thermocouple 10 of the cooling section 15 and the feeding section 16, and the power regulator of the cooling section 15 and the feeding section 16, so as to provide data support for accurately controlling the flow rate of the connecting tank 17 and adjust the power of the cooling section 15 and the feeding section 16 in a more targeted manner.

[0070] S24: When the glass liquid covers the electrode 9, the electrode 9 is started to heat the glass liquid.

[0071] S25: Use a liquid level meter to monitor the liquid glass level in the flow channel 1 until the liquid level reaches a target value.

[0072] S3: Leading stage

[0073] S31: When the liquid level of the flow channel 1 reaches the target value, the industrial computer sends a command to the PLC of the regulating gate 4, and the PLC controls the corresponding lifting mechanism to gradually lift the regulating gate 4.

[0074] S32: After the glass liquid enters the tin bath 3, according to the weight change fed back by the weighing sensor 6 and the glass liquid flow rate at the connecting tank 17 preliminarily calculated in the liquid level establishment stage, the industrial computer can calculate the glass liquid flow rate entering the tin bath 3, that is, the glass liquid flow rate (unit: kg / h, hereinafter referred to as flow rate) we need in production.

[0075] S33: gradually increase the opening of the gate 4 until the flow reaches the target value. During this period, the industrial computer can preliminarily calculate the relationship between each process parameter and flow under specific working conditions based on the glass liquid flow of the connecting tank 17, the temperature data fed back by the thermocouple 10 in the flow channel, the heating power of the electrode 9, the heating power of the silicon carbon rod 8, the pressure data fed back by the pressure sensor 11 of the flow tank 1, the liquid level data detected by the liquid level meter, and the gate opening data, so as to provide data support for the precise control of the flow, and more targetedly adjust the power of the electrode 9 or the silicon carbon rod 8 and the gate opening.

[0076] S34: tinning bath 3 edge drawing machine.

[0077] During the plate introduction stage, the pressure in the flow channel 1 must be controlled to be slightly positive, and the temperature at the weighing sensor 6 must also be controlled within an appropriate range. The control method is the same as step S14. Due to the influence of factors such as the pressure, temperature and liquid level of the flow channel 1, the tank pressure of the tin tank 3 and the pulling speed of some edge drawing machines, as well as the limitations of short production time and small amount of accumulated data, the accuracy of the calculated flow rate at this time is poor. As the data increases, the calculation of the glass liquid flow rate of the connecting tank 17 will become more and more accurate, and the control of the glass liquid flow rate of the connecting tank 17 will become more and more precise. The safety gate is a gate for temporary flow control when the regulating gate 4 needs to be replaced after being damaged. Its control method is the same as that of the regulating gate 4. Because the two gates are close in position, the data of the control regulating gate 4 can be referred to during control.

[0078] Formal production stage

[0079] On the basis of the above data, as the feedback data of various flow channel systems, manual weighing data, platinum channel cooling section 15 and feeding section 16 data, tin tank 3 tank pressure and temperature and other related data continue to accumulate, the industrial computer can continuously correct the relationship between various data and the flow rate and the glass liquid flow rate of the connecting tank 17 through big data calculation, and calculate the flow rate and the glass liquid flow rate of the connecting tank 17 more accurately, thereby improving the control accuracy of the flow rate.

[0080] When necessary, it can be switched to fully automatic mode. The industrial computer can automatically issue instructions to the power regulator or PLC of each device based on the large amount of analysis results in the database, realize automatic control under the premise of precise control of flow, and improve the automation and intelligence level of the production line.

[0081] When encountering abnormal situations, before manual intervention, the industrial computer can analyze the database as a basis and carry out corresponding emergency treatment in advance to reduce production losses. At the same time, the data generated by manual operation can also be analyzed for big data after screening, providing technical support for later emergency treatment.

[0082] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should still fall within the scope of the claims of the present invention.

Claims

1. A flow channel structure for float liquid crystal display glass, characterized in that: include: A flow channel assembly, the flow channel assembly comprising a flow channel (1) and a top cover (2), the flow channel (1) being fixedly arranged on a support frame, the top cover (2) being arranged outside the flow channel (1), one end of the top cover (2) being connected to a feeding section (16) of a platinum channel, and the other end being in contact with a tin bath (3), the top cover (2) and the flow channel (1) enclosing a closed space as a glass liquid flow channel, the width of the glass liquid flow channel being larger than the width of the feeding section (16) of the platinum channel for feeding, and smaller than the width of the tin bath (3), a gap being arranged between the top cover (2) and the flow channel (1), and a mounting position for an adjusting gate (4) being reserved at the top of the top cover (2); A heating component, wherein the heating component is used to heat the glass liquid in the flow channel component; A control component, the control component comprising a plurality of information acquisition sensors, a weighing sensor (6) and a control system (5), the information acquisition sensor being used to acquire temperature and pressure information in a glass liquid flow channel and transmitting the information to the control system (5); the weighing sensor (6) being arranged between a base and a support frame, the weighing sensor (6) being used to acquire weight information data of the glass liquid above the flow channel (1) and uploading the information to the control system (5), the control system (5) being used to analyze the data information acquired by the information acquisition sensor and the weighing sensor (6), and controlling the operation of the flow channel structure according to the analysis result and a preset program; The analysis process of the control system (5) includes: retrieving online weighing data, manual sampling weighing data and corresponding time information obtained by the weighing sensor (6) under the same working conditions from a database, generating weighing data curves for the two sets of data respectively, then fitting the curves of the two sets of data, and deducing the delay time coefficient t between the glass strip information obtained by the weighing sensor (6) and the manual weighing corresponding point information according to the variation law of the curve; then retrieving and analyzing the influence of temperature, pressure, glass liquid level and gate opening on the glass liquid based on the delay time coefficient t, and finally generating a glass liquid flow control model, and associating the weighing sensor (6), temperature and glass liquid flow through the glass liquid flow control model, and then realizing accurate control of the glass liquid flow based on the model.

2. A flow channel structure for float liquid crystal display glass according to claim 1, characterized in that: The flow channel (1) comprises a bottom wall, a front wall and side walls, wherein the front wall and side walls are vertically fixed to the front end and both sides of the bottom wall, a lip brick is arranged at the other end of the bottom wall, and a heat insulation baffle (7) is arranged below the lip brick.

3. The flow channel structure for producing float liquid crystal display glass according to claim 1, characterized in that: The heating assembly comprises a silicon carbon rod (8) and an electrode (9), wherein the electrode (9) is arranged on a side wall of the flow channel (1), and the silicon carbon rod (8) is detachably mounted on the side wall of the top cover (2).

4. The flow channel structure for float liquid crystal display glass according to claim 1, characterized in that: The information acquisition sensor comprises a thermocouple (10), a pressure sensor (11), and a liquid level meter (12).

5. The flow channel structure for float liquid crystal display glass according to claim 4, characterized in that: The plurality of thermocouples (10) are respectively arranged at the feed section (16), the bottom of the flow channel (1), and the top of the top cover (2); and the pressure sensor (11) is arranged on the top cover (2) and below the flow channel (1).

6. The flow channel structure for float liquid crystal display glass according to claim 5, characterized in that: A cold air outlet (13) is provided below the flow channel (1).

7. The flow channel structure for producing float liquid crystal display glass according to claim 1, characterized in that: A plurality of ventilation pipes (14) are provided on the top cover (2), the ventilation pipes (14) are connected to a nitrogen source, and a return air port (19) is provided at the bottom of the top cover.

8. The flow channel structure for float liquid crystal display glass according to claim 1, characterized in that: The front end of the flow channel component is hermetically connected to the platinum channel via a connecting groove (17); the platinum channel comprises a cooling section (15) and a feeding section (16) which are fixedly connected; the feeding section (16) is a flat rectangular parallelepiped structure; the cross-sectional area of ​​the feeding section (16) matches the longitudinal cross-sectional area of ​​the cooling section (15); the lower end of the feeding section (16) is hermetically connected to the connecting groove (17) via a funnel structure; the connecting groove (17) is a flat rectangular parallelepiped structure.

9. The flow channel structure for producing float liquid crystal display glass according to claim 8, characterized in that: A heating cover plate (18) is provided on the top of the feeding section (16), and an observation hole is provided on the heating cover plate (18).

10. A float liquid crystal display glass flow control method, characterized in that: The steps include: S1: Heating stage: S11: adjusting the gate plate (4) to descend until it touches the bottom of the flow channel (1); when the gate plate (4) is adjusted to descend to touch the bottom of the flow channel (1), it is ensured that the flow channel (1) is not subjected to force; S12: introducing nitrogen gas at room temperature into the glass liquid flow channel from the vent pipe (14); S13: the control system (5) sends a command to the heating component to heat the glass liquid flow channel through the heating component; S14: according to the change of the flow channel temperature, the temperature of the nitrogen gas introduced is increased simultaneously until the temperature in the glass liquid flow channel reaches the process requirement; S15: heating the platinum channel for feeding materials until the temperature reaches the process requirements; S2: Liquid level establishment stage: S21: before the glass liquid in the platinum channel enters the feeding section (16), the display data of the weighing sensor (6) is reset to zero; S22: When the glass liquid enters the feeding section (16), the power of the feeding section (16) is turned on to the minimum, so that the glass liquid in the feeding section (16) reaches the designated position as quickly as possible. During this process, the control system (5) calculates the flow rate of the glass liquid at the connecting groove (17) under the current working condition according to the weight fed back by the weighing sensor (6) using big data analysis technology; S23: As the glass liquid in the feeding section (16) is filled to the desired position, the heating power of the cooling section (15) and the feeding section (16) is gradually increased. During this process, the control system (5) uses the big data analysis technology to preliminarily calculate the relationship between various process parameters and the glass liquid flow rate of the connecting tank based on the data fed back by the weighing sensor (6), the thermocouples (10) of the cooling section and the feeding section, and the power regulators of the cooling section and the feeding section; S24: when the glass liquid is submerged in the electrode (9), starting the electrode (9) to heat the glass liquid; S25: Using a liquid level meter to monitor the liquid level of the glass liquid in the flow channel (1) until the liquid level reaches a target value; S3: Leading stage: S31: When the liquid level of the flow channel (1) reaches the target value, the control system (5) issues a command to gradually raise the height of the regulating gate (4) through the lifting mechanism; S32: After the glass liquid enters the tin bath (3), the control system (5) calculates the flow rate of the glass liquid entering the tin bath (3) based on the weight change fed back by the weighing sensor (6) and the glass liquid flow rate at the connecting groove (17) preliminarily calculated during the liquid level establishment stage; S33: gradually increasing the opening of the regulating gate (4) until the flow rate of the glass liquid entering the tin bath (3) reaches the target value. During this process, the control system (5) preliminarily calculates the relationship between each process parameter and the flow rate based on the glass liquid flow rate of the connecting tank (17), the temperature data fed back by the thermocouple (10) in the flow channel, the electrode heating power, the silicon carbon rod heating power, the pressure fed back by the flow tank pressure sensor (11), the liquid level detected by the liquid level meter (12), and the opening of the regulating gate (4) using big data analysis technology; S34: tinning bath (3) edge drawing machine; S4: Formal production stage: The database of the control system (5) is continuously accumulated and improved with the collected data. Through big data analysis and correction of the relationship between various data and the flow rate and the glass liquid flow rate of the connecting tank, the flow rate and the glass liquid flow rate of the connecting tank are accurately calculated.

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