A homogeneous and stable supply system and method of a glass melt of a substrate glass

Abstract

The application discloses a glass liquid homogenizing and stable feeding system and method for substrate glass, wherein an outlet pipe of a glass liquid feeding device sends the glass liquid into a second feeding pipe through a first feeding pipe to form a certain liquid level height; inner and outer heaters are divided into several groups of independent heaters to heat the glass liquid, so that the glass liquid extraction amount is conveniently controlled; a parameter acquisition unit acquires the liquid level height and temperature of the glass liquid in the second feeding pipe; a parameter processing unit calculates the difference between the theoretical and target extraction amounts of the glass liquid; and a feedback adjusting unit conveniently increases or decreases the current value of the inner and outer heating units in each group of heaters. The application guarantees the uniformity of the glass liquid temperature during the extraction amount adjustment process, solves the substrate glass defect problem caused by the non-uniformity of the formed glass liquid temperature, realizes the feeding adjustment of each group of heaters and the automatic control of the glass substrate extraction amount, and further realizes the rapid response and accurate control of the extraction amount adjustment.

Description

Technical Field

[0001] This invention belongs to the field of substrate glass manufacturing, specifically relating to a glass liquid homogenization and stabilization feeding system and method for substrate glass. Background Technology

[0002] In the production of substrate glass, the corresponding batch materials are first melted into molten glass at high temperature in a furnace. Then, in a platinum channel, a series of processes such as heating and clarifying and cooling and stirring are carried out to bring the temperature of the molten glass to meet the conditions for substrate glass forming. Finally, the production of substrate glass is completed by overflow pull-down method.

[0003] The feeding device is one of the key pieces of equipment in the production and manufacturing process of substrate glass. Its main function is to stably and uniformly supply the molten glass of the substrate glass to form the substrate glass, so as to achieve high-quality overflow pull-down of the formed glass.

[0004] High-quality overflow pull-down requires continuous and stable feeding measures, namely, homogenization of the molten glass, stability of the extraction rate, and uniformity of the molten glass temperature. However, current feeding devices often use a single-sided heater to continuously heat the molten glass, which easily leads to differences between the center and surface temperatures of the molten glass during feeding. This results in uneven temperature distribution of the molten glass and increases the reaction time of the molten glass to temperature changes, making it impossible to achieve rapid response and precise control of the extraction rate. This further affects the quality of the substrate glass formed by the overflow pull-down method, ultimately leading to uneven substrate glass thickness, stress, and warpage that do not meet requirements. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention proposes a glass melt homogenization and stabilization feeding system and method for substrate glass, which realizes automated control of the glass melt extraction amount of the substrate glass, solves the problems of errors and lags caused by manual experience in adjusting the extraction amount, and substrate glass defects caused by uneven temperature of the formed glass melt, and effectively improves production efficiency.

[0006] This invention is achieved through the following technical solution:

[0007] A glass liquid homogenization and stabilization feeding system for substrate glass includes a first feeding pipe, an L-shaped second feeding pipe, an external heater, an internal heater, a parameter acquisition unit, a parameter processing unit, and a feedback adjustment unit.

[0008] The upper and lower openings of the first feeding pipe are connected to the outside. The inlet on one side of the first feeding pipe is connected to the outlet pipe of the glass liquid feeding device for the substrate glass. The upper opening of the second feeding pipe is provided with a sealing cap. The lower opening of the first feeding pipe is vertically fixed and sealed through the sealing cap. The lower opening of the second feeding pipe is connected to the muffle furnace.

[0009] The inner heater is cylindrical and fixed axially in the first feed pipe. The outer wall of the inner heater is provided with a platinum sleeve, which is in contact with the molten glass. The outer heater covers the outer wall of the first feed pipe. The inner heater includes several inner heating units, and the outer heater includes several outer heating units that correspond one-to-one with the inner heating units. One inner heating unit and its corresponding outer heating unit form a group of heaters. The feedback adjustment unit is connected to the power control terminals of the inner heating unit and the outer heating unit in each group of heaters.

[0010] The parameter processing unit is connected to the feedback adjustment unit. The parameter acquisition unit is used to acquire the glass melt level in the second feed pipe and the glass melt temperature at the outlet of the second feed pipe. The parameter processing unit is used to calculate the difference between the theoretical draw-out amount and the target draw-out amount of the glass melt. The feedback adjustment unit is used to adjust the current value of the internal heating unit and the external heating unit in each group of heaters.

[0011] Preferably, an air inlet pipe and an air outlet pipe are installed on the sealing cover at positions on both sides of the first feeding pipe. The air inlet pipe is equipped with a first gas check valve, and the air outlet pipe is equipped with a second gas check valve. The first gas check valve and the second gas check valve are arranged in opposite directions. A first pressure change sensor and a first signal transmitting device are installed on the first gas check valve, and a second pressure change sensor and a second signal transmitting device are installed on the second gas check valve.

[0012] Preferably, the main structure of the internal heater is a cylindrical refractory brick. A triangular platinum guide head is fixed on the lower end face of the refractory brick. A groove for winding heating wire is opened on the outer wall of the refractory brick. Several sections of heating wire are wound in the groove. The diameter of the heating wire is smaller than the depth of the groove. Both ends of each section of heating wire are led out from the inside of the refractory brick to the outside of the first feed pipe to form an internal heating unit. The outer wall of the refractory brick is wrapped with a first filler layer. A platinum sleeve is tightly fitted on the outer wall of the first filler layer. The platinum sleeve is flush with the upper end of the platinum guide head.

[0013] Preferably, the external heater includes a refractory brick layer, a second filler layer, and insulating bricks. The refractory brick layer is disposed on the outside of the first feed pipe. The inner wall of the refractory brick layer is provided with a groove for winding heating wires. Several segments of heating wires, the same number as the number of inner heating units, are wound in the grooves. The diameter of the heating wires is smaller than the depth of the grooves. Both ends of each segment of heating wire are led out from inside the refractory brick layer to outside the first feed pipe to form an external heating unit. The second filler layer is filled between the first feed pipe and the refractory brick layer. The insulating bricks are tightly wrapped around the outer wall of the refractory brick layer.

[0014] A method for homogenizing and stabilizing the glass melt supply of a substrate glass, based on the glass melt homogenizing and stabilizing supply system for the substrate glass described in any one of the above-mentioned methods, includes the following steps:

[0015] S1, the parameter acquisition unit acquires the liquid level height of the molten glass in the second feed pipe and the temperature of the molten glass at the outlet of the second feed pipe within a preset time period.

[0016] S2, the parameter processing unit first calculates the theoretical extraction amount based on the collected liquid level height and temperature, then determines the difference θ between the theoretical extraction amount and the target extraction amount, and obtains the extraction amount correction parameter based on the relationship between |θ| and the extraction amount threshold θ1;

[0017] S3, when |θ| is less than or equal to θ1, the feedback control unit does not control the internal heating unit and the external heating unit in each group of heaters;

[0018] When |θ| is greater than θ1 and the difference between |θ| and θ1 is positive, the adjustment feedback unit first converts the output correction parameter into an electrical signal, and then converts the electrical signal into the total feeding power correction parameter P. 修a Then P 修a Differential allocation of the internal heating unit and external heating unit in each group of heaters yields P. na1 P na2 Finally, according to P na1 P na2 Obtain the current I of the internal heating unit in each group of heaters that needs to be reduced. na1 and the current I of the external heating unit na2 ;

[0019] When |θ| is greater than θ1 and the difference between |θ| and θ1 is negative, the adjustment feedback unit first converts the output correction parameter into an electrical signal, and then converts the electrical signal into the total feeding power correction parameter P. 修b Then P 修b Differential allocation of the internal heating unit and external heating unit in each group of heaters yields P. nb1 P nb2 Finally, according to P nb1 P nb2 Obtain the current I of the internal heating unit in each group of heaters that needs to be adjusted upwards. nb1 and the current I of the external heating unit nb2 ;

[0020] After current correction in S3, in each group of heaters, the effective power of the inner heating unit for heating the platinum sleeve 8 is equal to the effective power of the outer heating unit for heating the first feed tube. The process of S1 to S3 is repeated until |θ| is less than or equal to θ1.

[0021] Furthermore, H and T in S1 are pre-collected, and then the least squares support vector machine algorithm is used to train the model f(T, H). S2 then substitutes the collected H and T into the model f(T, H) to obtain the theoretical extraction quantity.

[0022] Furthermore, the fluctuation value of the theoretical extraction quantity described in S2 is δ, where δ ranges from 0 to 30 kg / h.

[0023] Furthermore, in S3, the power change value ΔP of the internal heating unit of the nth group of heaters n1 and the power change value ΔP of the external heating unit n2 The power change ΔP of the internal heating unit of the (n-1)th group of heaters (n-1)1 and the power change value ΔP of the external heating unit (n-1)2 Satisfy the following equation: (ΔP) n1 +ΔP n2 )=(ΔP (n-1)1 +ΔP (n-1)2 )+K;

[0024] Where: ΔP n1 ΔP n2 ΔP (n-1)1 and ΔP (n-1)2 The units are all KW, where K is a positive number. The sum of the power change values ​​of the inner heating unit and the outer heating unit in the heater at the top of the first feed pipe is the largest, while the sum of the power change values ​​of the inner heating unit and the outer heating unit in the heater at the bottom of the first feed pipe is the smallest.

[0025] Furthermore, the ΔP n1 ΔP n2 ΔP (n-1)1 and ΔP (n-1)2 The value range is 0.01~0.2KW.

[0026] Furthermore, in S3, P na1 with I na1 Satisfy the following formula:

[0027]

[0028] P na2 with I na2 Satisfy the following formula:

[0029]

[0030] Where: P na1 P na2 These represent the effective power of the internal heating unit for heating the platinum sleeve and the effective power of the external heating unit for heating the first feed tube, respectively, both in KW; na1 I na2 The units for all values ​​are A; ρ na1 , ρ na2 These are the resistivity of the heating wires in the internal and external heating units, respectively, both in μΩ·cm; na1 , lna2 These represent the lengths of the heating wires in the internal heating unit and the external heating unit, respectively, both in cm; d na1 d na2 These are the diameters of the heating wires in the internal and external heating units, respectively, both in cm; β na1 ,β na2 These are the conversion coefficients for heating the platinum sleeve by the internal heating unit and the conversion coefficients for heating the first feed tube by the external heating unit, respectively.

[0031] P nb1 with I nb1 Satisfy the following formula:

[0032]

[0033] P nb2 with I nb2 Satisfy the following formula:

[0034]

[0035] Where: P nb1 P nb2 These represent the effective power of the internal heating unit for heating the platinum sleeve and the effective power of the external heating unit for heating the first feed tube, respectively, both in KW; nb1 I nb2 The units for all values ​​are A; ρ nb1 , ρ nb2 These are the resistivity of the heating wires in the internal and external heating units, respectively, both in μΩ·cm; nb1 , l nb2 These represent the lengths of the heating wires in the internal heating unit and the external heating unit, respectively, both in cm; d nb1 d nb2 These are the diameters of the heating wires in the internal and external heating units, respectively, both in cm; β nb1 ,β nb2 These are the conversion coefficients for heating the platinum sleeve by the internal heating unit and the conversion coefficients for heating the first feed tube by the external heating unit, respectively.

[0036] Compared with the prior art, the present invention has the following beneficial technical effects:

[0037] This invention discloses a glass melt homogenization and stabilization feeding system for substrate glass. The glass melt feeding device can deliver glass melt through a first feeding pipe into a second feeding pipe via its outlet pipe, creating a specific liquid level in the second feeding pipe. Internal and external heaters, through contact with the glass melt, can be divided into several independent groups to heat the glass melt, facilitating control of the glass melt extraction rate. A parameter acquisition unit can acquire the glass melt level in the second feeding pipe and the glass melt temperature at the outlet of the second feeding pipe. Then, a parameter processing unit can calculate the difference between the theoretical extraction rate and the target extraction rate of the glass melt, facilitating the feedback adjustment unit to adjust the current values ​​of the internal and external heating units in each group of heaters. This invention, through the setting of internal and external heaters and the differentiated adjustment of the current of the internal and external heaters, achieves simultaneous rise and fall of the internal and external temperatures of the glass melt, ensuring the uniformity of glass melt temperature during extraction rate adjustment. This solves the problem of substrate glass defects caused by uneven temperature of the formed glass melt, and realizes automated control of the feeding adjustment of each group of heaters and the extraction rate of the glass substrate, further achieving rapid response and precise control of the extraction rate adjustment.

[0038] This invention discloses a method for homogenizing and stabilizing the supply of molten glass to a substrate. Within a specified time period, a parameter acquisition unit collects the molten glass level in the second supply pipe and the molten glass temperature at the outlet of the second supply pipe. Then, a parameter processing unit calculates the difference between the real-time theoretical extraction amount and the target extraction amount using these supply extraction amount parameter data, determines the extraction amount correction parameter, and converts the extraction amount correction parameter into an electrical signal. This electrical signal can be further converted into a total supply power parameter. The total power of the supply tank is then distributed to each group of heaters according to a certain allocation coefficient. Finally, the current of the internal and external heaters is differentially adjusted to heat the molten glass in the supply device. When the absolute value of the difference is greater than the extraction amount... When the threshold difference is positive, it indicates that the real-time theoretical extraction amount is greater than the extraction amount required by the process. Therefore, the current of the inner heating unit and the current of the outer heating unit in each heater group need to be adjusted downwards. Conversely, when the difference is negative, it indicates that the real-time theoretical extraction amount is less than the extraction amount required by the process. Therefore, the current of the inner heating unit and the current of the outer heating unit in each heater group need to be adjusted upwards. This enables automated control of the material supply adjustment of each heater group and the extraction amount of the glass substrate, improves the temperature uniformity of the formed glass melt, and further realizes rapid response and precise control of the extraction amount adjustment. It solves the error and lag caused by manual experience-based adjustment of the extraction amount, and improves the production quality of the substrate glass. This invention shortens the heating time of the glass melt by setting inner and outer heaters, thereby shortening the reaction time of extraction amount adjustment, enabling rapid response and precise control of the extraction amount adjustment, and effectively improving production efficiency. Attached Figure Description

[0039] Figure 1 This is a flowchart of the glass liquid homogenization and stabilization feeding method for the substrate glass described in this invention.

[0040] Figure 2 This is a schematic diagram showing the arrangement of the first feed pipe, the second feed pipe, and the outlet pipe of the present invention.

[0041] Figure 3 This is a schematic diagram of the arrangement structure of the first feed pipe, the outer heater, and the inner heater described in this invention.

[0042] Figure 4 for Figure 3 Sectional view at point AA.

[0043] Wherein: 1-First feed pipe, 2-Second feed pipe, 3-Sealing cap, 4-Inlet pipe, 5-Outlet pipe, 6-Outlet pipe, 7-Insulating brick, 8-Platinum sleeve, 9-Refractory brick, 10-First filler layer, 11-Platinum drain head, 12-Second filler layer, 13-Refractory brick layer. Detailed Implementation

[0044] The principles and specific content of the present invention will be further described below with reference to the embodiments and accompanying drawings. The embodiments are only used to explain the present invention and are not intended to limit the present invention.

[0045] The present invention provides a glass liquid homogenization and stabilization feeding system for substrate glass, comprising a glass liquid feeding device for substrate glass, a first feeding pipe 1 and a second feeding pipe 2, as well as an external heater disposed outside the first feeding pipe 1 and an internal heater disposed inside the first feeding pipe 1.

[0046] like Figure 2 As shown, the outlet pipe 6 of the glass melt supply device for the substrate glass is connected to the first supply pipe 1. The upper and lower openings of the first supply pipe 1 are connected to the outside. The outlet pipe 6 is horizontally positioned and perpendicular to the first supply pipe 1. The main structure of the first supply pipe 1 is cylindrical. The portion of the first supply pipe 1 connected to the outlet pipe 6 extends outward to form a protruding section. The longitudinal section of the protruding section is a symmetrically distributed trapezoid. The second supply pipe 2 is L-shaped. A sealing cap 3 is provided at the upper opening of the second supply pipe 2. The lower opening of the first supply pipe 1 is fixed and sealed through the sealing cap 3. The first supply pipe 1 is perpendicular to the sealing cap 3. The lower opening of the second supply pipe 2, i.e., the outlet, is connected to the muffle furnace. Therefore, the glass melt flows into the muffle furnace sequentially through the outlet pipe 6, the first supply pipe 1, and the second supply pipe 2.

[0047] Two through holes are pre-drilled on both sides of the sealing cap 3, at the positions of the first feed pipe 1, to seal and install the air inlet pipe 4 and the air outlet pipe 5 respectively. The air inlet pipe 4 and the air outlet pipe 5 are respectively equipped with a first gas check valve and a second gas check valve, which are arranged in opposite directions to ensure that the air inlet pipe 4 only allows air to enter and the air outlet pipe 5 only allows air to exit. A first pressure change sensor and a first signal transmitting device are installed on the first gas check valve, and a second pressure change sensor and a second signal transmitting device are installed on the second gas check valve. The height of the molten glass in the second feed pipe 2 is measured by the change in spatial pressure. When the spatial pressure above the liquid surface in the second feed pipe 2 changes, the first and second pressure change sensors convert the pressure change values ​​before and after the change in the liquid level height into electrical signals, which are transmitted to the computer through the first and second signal transmitting devices respectively. The computer can indirectly calculate the liquid level height of the molten glass using a trained least squares support vector machine algorithm.

[0048] like Figure 3 As shown, the internal heater includes a cylindrical refractory brick 9, which is fixedly positioned at the center of the first feed pipe 1 along its height. A triangular platinum guide head 11 is fixedly positioned at the lower end of the refractory brick 9. The internal heater is placed in the first feed pipe 1, and the platinum guide head 11 is the first to contact the molten glass. The refractory brick 9 has a groove for winding heating wires, the depth of which is greater than the diameter of the heating wires. Several sections of heating wires are wound in the grooves, and both ends of each section of heating wires are led out from the inside of the refractory brick 9 to the outside of the first feed pipe 1 for independent power supply. The outer wall of the refractory brick 9 is covered with a first filler layer 10, so the heating wires are all inside the first filler layer 10. A platinum sleeve 8 is fitted onto the outer wall of the first filler layer 10, and the platinum sleeve 8 is in close contact with the first filler layer 10 and is in contact with the molten glass. The upper edge of the platinum guide head 11 is flush with the platinum sleeve 8. Therefore, the internal heater consists of several internal heating units corresponding to the number of heating wire segments.

[0049] like Figure 4As shown, the structure of the external heater is similar to that of the internal heater. The external heater includes a refractory brick layer 13 wrapped around the first feed pipe 1. The inner wall of the refractory brick layer 13 has grooves for winding heating wires. The depth of these grooves is greater than the diameter of the heating wires. Several segments of heating wire, the same number as the number of internal heating units, are wound in the grooves. Each segment of heating wire extends from the inside of the refractory brick layer 13 to the outside of the first feed pipe 1 for independent power supply. A second filler layer 12 fills the space between the first feed pipe 1 and the refractory brick layer 13, so all the heating wires face outwards from the second filler layer 12. The outer wall of the refractory brick layer 13 is tightly wrapped with insulating bricks 7. Therefore, the external heater consists of several external heating units, the same number as the number of internal heating units. It should be noted that the second filler layer 12, the refractory brick layer 13, and the insulating bricks 7 are not arranged at the position corresponding to the outlet pipe 6 in the protruding section of the first feed pipe 1.

[0050] The first feed pipe 1, the second feed pipe 2, the outlet pipe 6, and the heating wire are all made of platinum, while the insulating brick 7, the first refractory brick 9, and the second refractory brick 13 are all made of alumina. It should be noted that there are 5 to 10 inner and outer heating units from top to bottom. The height of the inner and outer heating units is adjustable, and one inner heating unit and one outer heating unit constitute one heater group.

[0051] Furthermore, the glass liquid homogenization and stabilization feeding system for substrate glass of the present invention also includes a parameter acquisition unit, a parameter processing unit, and a feedback adjustment unit. The parameter processing unit is connected to the feedback adjustment unit, and the feedback adjustment unit is connected to the power control terminals of the inner heating unit and the outer heating unit in each group of heaters.

[0052] The parameter acquisition unit is used to acquire the parameters of each heating group (current, heating wire length and diameter) and the output parameters (glass liquid level height H and glass liquid temperature T at the outlet of the second feed pipe 2) online.

[0053] The parameter processing unit is used to calculate the theoretical extraction amount based on the model f(T, H), compare the theoretical extraction amount with the target extraction amount, determine whether the extraction amount needs to be adjusted, and if adjustment is required, obtain the extraction amount correction parameter.

[0054] First, the model f(T, H) is established by training the model f(T, H) using the pre-collected liquid level height H and temperature T on a least squares support vector machine algorithm. The least squares support vector machine algorithm is capable of computing small batches of samples and has strong generalization ability.

[0055] Secondly, the real-time liquid level height H and temperature T collected by the parameter acquisition unit are substituted into the model f(T, H) to calculate the theoretical output quantity Q:

[0056] Q = f(T, H)

[0057] Where: Q is the theoretical output, in kg / h; T is the real-time glass melt temperature at the outlet of the second feed pipe 2, in °C; H is the real-time liquid level height, in mm.

[0058] Next, set the target extraction amount Q1 and calculate the extraction amount correction parameter θ:

[0059] θ = Q - Q1

[0060] Set a threshold θ1 for the output. When the output fluctuates, if |θ| is less than or equal to θ1, the output is not adjusted; if |θ| is greater than θ1, the output needs to be adjusted. That is, when the difference between |θ| and θ1 is positive, it indicates that the output is greater than the target value, and the current of each heater group is reduced by adjusting the feedback unit; that is, when the difference between |θ| and θ1 is negative, it indicates that the output is less than the target value, and the current of each heating group is increased by adjusting the feedback unit.

[0061] The feedback control unit converts the output correction parameter into an electrical signal, and then converts the electrical signal into the total feeding power correction parameter P. 修 The total power correction parameter for the feed is transmitted to each group of heaters according to a certain allocation coefficient, thus obtaining the power correction parameter corresponding to each group of heaters, namely: (P 内1 +ΔP 外1 )+(ΔP 内2 +ΔP 外2 )+…+(ΔP 内n +ΔP 外n ) = P 修 ;wherein: P 修 This is a correction parameter for total power supply, in kW, ΔP. 内n ΔP 外n The corrected power for the nth group of internal and external heaters is given in KW. Finally, the current correction parameters for each group of heaters are calculated. By adjusting the current of the internal and external correction parameters in a differentiated manner, the feed of each group of heaters is adjusted, thereby achieving the adjustment and precise control of the output.

[0062] Among them, the effective power P of the inner heating unit of the nth group of heaters for heating the platinum sleeve 8 n1 Current I of the internal heating unit n1 Satisfy the following formula:

[0063]

[0064] The effective power P of the external heating unit of the nth group of heaters for heating the first feed pipe 1 is... n2 Current I of the external heating unit n2 Satisfy the following formula:

[0065]

[0066] Where: P n1 P n2 These are the effective power (in KW) of the internal and external heating units for heating the platinum sleeve 8 and the first feed tube 1. n1 I n2 ρ represents the current of the internal and external heating units, in amperes (A). n1 , ρ n2 The resistivity of the heating wire is expressed in μΩ·cm; n1 , l n2 d represents the length of the heating wire in the internal and external heating units, in cm. n1 d n2 β is the diameter of the heating wire in the internal and external heating units, in cm. n1 ,β n2 The conversion coefficient for heating the platinum sleeve 8 and the first feed tube 1 by the internal and external heating units.

[0067] After current correction, for the inner heating unit and the outer heating unit in each heater group, the effective power P of the inner heating unit for heating the platinum sleeve 8 is... i1 The effective power P of the external heating unit for heating the first feed pipe 1 i2 Equal, i.e., P i1 =P i2 This ensures that the molten glass in the corresponding area is heated evenly.

[0068] In order to orderly process P n1 P n2 After adjustment, the total power changes of the internal and external heating units of the n-group heaters and the n-1-group heaters follow an arithmetic progression, i.e.:

[0069] (ΔP n1 +ΔP n2 )=(ΔP (n-1)1 +ΔP (n-1)2 )+K; where: ΔP n1 ΔP n2 ΔP (n-1)1 ΔP (n-1)2 These represent the power variation values ​​of the internal and external heating units of the n groups of heaters and the (n-1) groups of heaters, respectively, in kW. The total power variation value of the internal and external heating units of the heater at the top of the first feed pipe 1 is the largest, while the total power variation value of the internal and external heating units of the heater at the bottom of the first feed pipe 1 is the smallest. That is, the sequence number of n starts from the bottom of the first feed pipe 1 and proceeds upwards. Specifically, the single adjustment range of the total power variation value of the internal and external heating units of each group of heaters is between 0.01kW and 0.2kW. Under this allocation approach, the best scenario is that the total power variation value of the heating units at the bottom of the first feed pipe 1 is zero, meaning that the bottom of the first feed pipe 1 does not need to be heated.

[0070] The functions of the data acquisition unit, data processing unit, and feedback adjustment unit are all implemented using a PLC controller.

[0071] This system is applicable when the theoretical output fluctuates. The theoretical output fluctuation is δ, in kg / h, and the value of δ ranges from 0 to 30 kg / h. If the output fluctuation exceeds this range, manual intervention is required for the feeding system.

[0072] This invention provides a method for homogenizing and stabilizing the supply of molten glass to a substrate, such as... Figure 1 As shown, it includes the following steps:

[0073] S1, the parameter acquisition unit collects the current, heating wire length and diameter of the inner heating unit and the outer heating unit in each heating group, as well as the liquid level H of the molten glass and the liquid temperature T of the outlet of the second feed pipe 2 within a preset time period.

[0074] S2, the parameter processing unit first calculates the theoretical extraction amount Q based on the collected liquid level height H and temperature T, and then calculates the difference θ between the theoretical extraction amount Q and the target extraction amount Q1.

[0075] S3, when |θ| is less than or equal to the extraction threshold θ1, the extraction amount is not adjusted, and the feedback adjustment unit does not control the internal heating unit and external heating unit in each group of heaters;

[0076] When |θ| is greater than θ1 and the difference between |θ| and θ1 is positive, the adjustment feedback unit first converts the output correction parameter into an electrical signal, and then converts the electrical signal into the total feeding power correction parameter P. 修a Then P 修a Differential allocation of the internal heating unit and external heating unit in each group of heaters yields P. na1 P na2 Finally, according to P na1 P na2 Obtain the current I of the internal heating unit in each group of heaters that needs to be reduced. na1 and the current I of the external heating unit na2 ;

[0077] When |θ| is greater than θ1 and the difference between |θ| and θ1 is negative, the adjustment feedback unit first converts the output correction parameter into an electrical signal, and then converts the electrical signal into the total feeding power correction parameter P. 修b Then P 修b Differential allocation of the internal heating unit and external heating unit in each group of heaters yields P. nb1 P nb2 Finally, according to P nb1 P nb2 The internal heating unit I in each group of heaters that needs to be adjusted upwards is obtained. nb1and the current I of the external heating unit nb2 ;

[0078] The total power change of the internal and external heating units of the n-group heaters and the n-1-group heaters follows an arithmetic progression, i.e., (ΔP) n1 +ΔP n2 )=(ΔP (n-1)1 +ΔP (n-1)2 )+K, the single adjustment range of the total power change value of the internal and external heating units of each heater group is between 0.01KW and 0.2KW;

[0079] P na1 with I na1 Satisfy the following formula:

[0080]

[0081] P na2 with I na2 Satisfy the following formula:

[0082]

[0083] Where: P na1 P na2 These represent the effective power of the internal heating unit for heating the platinum sleeve 8 and the effective power of the external heating unit for heating the first feed tube 1, both in KW; na1 I na2 The units for all values ​​are A; ρ na1 , ρ na2 These are the resistivity of the heating wires in the internal and external heating units, respectively, both in μΩ·cm; na1 , l na2 These represent the lengths of the heating wires in the internal heating unit and the external heating unit, respectively, both in cm; d na1 d na2 These are the diameters of the heating wires in the internal and external heating units, respectively, both in cm; β na1 ,β na2 These are the conversion coefficients for heating the platinum sleeve 8 by the internal heating unit and the conversion coefficients for heating the first feed tube 1 by the external heating unit, respectively.

[0084] P nb1 with I nb1 Satisfy the following formula:

[0085]

[0086] P nb2 with I nb2 Satisfy the following formula:

[0087]

[0088] Where: P nb1 P nb2 These represent the effective power of the internal heating unit for heating the platinum sleeve 8 and the effective power of the external heating unit for heating the first feed tube 1, both in KW; nb1 I nb2 The units for all values ​​are A; ρ nb1 , ρ nb2 These are the resistivity of the heating wires in the internal and external heating units, respectively, both in μΩ·cm; nb1 , l nb2 These represent the lengths of the heating wires in the internal heating unit and the external heating unit, respectively, both in cm; d nb1 d nb2 These are the diameters of the heating wires in the internal and external heating units, respectively, both in cm; β nb1 ,β nb2 These are the conversion coefficients for heating the platinum sleeve 8 by the internal heating unit and the conversion coefficients for heating the first feed tube 1 by the external heating unit, respectively.

[0089] S4, repeat the process from S1 to S3 until |θ| is less than or equal to the threshold θ1 of the extracted quantity.

Claims

1. A method of homogenizing and stably supplying a glass melt of a substrate glass, characterized by, The application relates to a substrate glass liquid homogenization stable supply system, which comprises a first supply pipe (1), a L-shaped second supply pipe (2), an external heater, an internal heater, and a parameter acquisition unit, a parameter processing unit and a feedback adjusting unit. The upper and lower pipe openings of the first supply pipe (1) are in communication with the outside, the inlet on one side of the first supply pipe (1) is in communication with an outlet pipe (6) of a substrate glass liquid supply device, the upper pipe opening of the second supply pipe (2) is provided with a sealing cover (3), the lower pipe opening of the first supply pipe (1) is vertically fixed and sealed in the sealing cover (3), and the lower pipe opening of the second supply pipe (2) is in communication with a muffle furnace. The internal heater is cylindrical and is fixed in the first supply pipe (1) in the axial direction, the outer wall of the internal heater is provided with a platinum sleeve (8), the platinum sleeve (8) is in contact with the glass liquid, the external heater is wrapped on the outer wall of the first supply pipe (1), the internal heater comprises a plurality of internal heating units, the external heater comprises a plurality of external heating units corresponding to the internal heating units, one internal heating unit and the corresponding external heating unit form a group of heaters, and the feedback adjusting unit is connected with the power supply control ends of the internal heating units and the external heating units in each group of heaters. The parameter processing unit is connected with the feedback adjusting unit, the parameter acquisition unit is used for acquiring the liquid level height of the glass liquid in the second supply pipe (2) and the glass liquid temperature at the outlet of the second supply pipe (2), the parameter processing unit is used for calculating the difference between the theoretical output and the target output of the glass liquid, and the feedback adjusting unit is used for adjusting the current values of the internal heating units and the external heating units in each group of heaters. The main body structure of the internal heater is a cylindrical refractory brick (9), the lower end surface of the refractory brick (9) is fixedly provided with a triangular platinum flow head (11), the outer wall of the refractory brick (9) is provided with a groove for winding heating wires, a plurality of heating wires are wound in the groove, the wire diameter of the heating wires is smaller than the groove depth, the two ends of each heating wire are led out from the inside of the refractory brick (9) to the outside of the first supply pipe (1) to form an internal heating unit, the outer wall of the refractory brick (9) is wrapped with a first filler layer (10), the first filler layer (10) is tightly sleeved with the platinum sleeve (8), and the upper end of the platinum sleeve (8) is flush with the upper end of the platinum flow head (11). Specifically, the following steps are included: S1, the parameter acquisition unit acquires the liquid level height H of the glass liquid in the second supply pipe (2) and the glass liquid temperature T at the outlet of the second supply pipe (2) in a preset time period; S2, the parameter processing unit determines the theoretical extraction quantity according to the collected liquid level and temperature calculating the theoretical extraction quantity, and then determining the difference between the theoretical extraction quantity and the target extraction quantity , according to the relationship between the extraction quantity threshold , the extraction quantity correction parameter is obtained; S3, when less than or equal to the feedback adjustment unit does not control the inner heating unit and the outer heating unit in each group of heaters. When greater than and the difference is positive, the feedback adjustment unit first converts the extraction amount correction parameter into an electrical signal, then converts the electrical signal into a total power supply correction parameter , and then differentially allocates the difference to the inner heating unit and the outer heating unit in each group of heaters, obtaining Finally, according to obtain the current of the inner heating unit in each group of heaters that needs to be adjusted downward and the current of the outer heating unit ; When greater than and the difference is negative, the feedback adjustment unit first converts the extraction amount correction parameter into an electrical signal, then converts the electrical signal into a total power supply correction parameter , and then differentially allocates the difference to the inner heating unit and the outer heating unit in each group of heaters, to obtain Finally, according to obtain the current of the inner heating unit in each group of heaters that needs to be increased and the current of the outer heating unit ; The inner heating unit power change value of the nth group of heaters and the outer heating unit power change value The inner heating unit power change value of the nth group of heaters and the outer heating unit power change value satisfies the following equation: ; Wherein: The unit is KW, The sum of the power variation value of the inner heating unit and the power variation value of the outer heating unit in the heater at the top of the first feeding pipe (1) is maximum, the power variation value of the inner heating unit and the power variation value of the outer heating unit in the heater at the bottom of the first feeding pipe (1) are zero, and the The value range of the power variation value of the inner heating unit and the power variation value of the outer heating unit in the heater at the top of the first feeding pipe (1) is 0.01-0.2 KW. S4, after the current correction of S3, in each group of heaters, the effective power of the inner heating unit to heat the platinum sleeve (8) is equal to the effective power of the outer heating unit to heat the first feed pipe (1), and the process of S1-S3 is repeated until less than or equal to .

2. The glass-liquid homogenizing stable supply method of a substrate glass according to claim 1, characterized by, The sealing cover (3) is provided with an air inlet pipe (4) and an air outlet pipe (5) at positions on both sides of the first supply pipe (1), the air inlet pipe (4) is provided with a first gas check valve, the air outlet pipe (5) is provided with a second gas check valve, the first gas check valve and the second gas check valve are oppositely arranged, the first gas check valve is provided with a first pressure change sensor and a first signal emitting device, and the second gas check valve is provided with a second pressure change sensor and a second signal emitting device.

3. The glass-liquid homogenizing stable supply method of a substrate glass according to claim 1, characterized by, The outer heater comprises a refractory brick layer (13), a second filler layer (12) and a heat preservation brick (7), the refractory brick layer (13) is arranged outside the first feeding pipe (1), the inner wall of the refractory brick layer (13) is provided with a groove for winding a heating wire, a plurality of heating wires with the same number as the inner heating units are wound in the groove, the wire diameter of the heating wire is smaller than the groove depth, and the two ends of each heating wire are led out from the inside of the refractory brick layer (13) to the outside of the first feeding pipe (1) to form an outer heating unit, the second filler layer (12) is filled between the first feeding pipe (1) and the refractory brick layer (13), and the heat preservation brick (7) is tightly wrapped on the outer wall of the refractory brick layer (13).

4. The method of claim 1, wherein the glass liquid homogenizing and stabilizing of the glass substrate is performed by a method comprising: Pre-acquisition in S1 , then through the training of least squares support vector machine algorithm, the model , S2 will be collected and T into the model , get the theoretical lead quantity.

5. The method of claim 1, wherein the glass liquid homogenizing and stabilizing of the glass substrate is performed by a method comprising: The fluctuation value of the theoretical lead-out amount in S2 is is 0 30 kg / h.

6. The method of claim 1, wherein the glass liquid homogenizing and stabilizing of the glass supply is characterized by, In S3, : : Wherein: Effective power of inner heating unit to platinum sleeve (8), effective power of outer heating unit to first feed pipe (1) heated, unit: KW; Unit: m ; Effective power of inner heating unit to platinum sleeve (8), effective power of outer heating unit to first feed pipe (1) heated, unit: KW; , unit: m ; Length of inner heating unit heating wire and outer heating unit heating wire, unit: m ; Diameter of inner heating unit heating wire and outer heating unit heating wire, unit: mm ; Conversion coefficient of inner heating unit to platinum sleeve (8) heated, conversion coefficient of outer heating unit to first feed pipe (1) heated; : : Wherein: are the effective power of the inner heating unit to the platinum sleeve (8) and the effective power of the outer heating unit to the first feed pipe (1) respectively, both units are KW; ; are the resistivity of the heating wire of the inner heating unit and the outer heating unit respectively, both units are ; are the length of the heating wire of the inner heating unit and the outer heating unit respectively, both units are ; are the diameter of the heating wire of the inner heating unit and the outer heating unit respectively, both units are ; are the conversion coefficient of the inner heating unit to the platinum sleeve (8) and the conversion coefficient of the outer heating unit to the first feed pipe (1) respectively.​

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