An overflow method glass substrate manufacturing glass flow plate and design method and system thereof

Abstract

The application discloses a kind of overflow method glass substrate manufacturing glass guide plate and its design method and system, by selecting mature overflow system guide plate as design reference, respectively obtain the geometric structure parameter of reference guide plate, overflow face width, guide plate upper and lower shrinkage width, overflow brick slope height, overflow system overflow coefficient and the parameters such as no guide plate edge plate flow contraction ratio, respectively establish geometric structure similarity, guide plate width similarity, critical shrinkage width similarity and critical edge plate flow similarity relationship, then establish guide plate guide edge plate thickness and average edge plate width similarity relationship, according to corresponding relationship, the structure size of design guide plate is calculated, to complete new overflow system guide plate structure design.It establishes the guide-out quantity promotion new overflow system guide plate structure design benchmark, while considering guide plate guide edge plate thickness and average edge plate width, can meet the demand of higher generation and higher guide-out quantity.

Description

Technical Field

[0001] This invention belongs to the field of glass substrate manufacturing, specifically to a glass guide plate for overflow method glass substrate manufacturing and its design method and system. Background Technology

[0002] In the manufacturing of flat panel displays such as TFT-LCDs (Thin Film Transistor Displays) and PDPs (Plasma Display Panels), glass substrates are manufactured using an overflow pull-down process. The glass overflow and pull-down process involves complex structural changes (physical dimensions and molecular levels). By establishing relevant kinetic models, the thickness distribution and stress patterns below the overflow surface and root can be revealed, and the causes of overflow brick wetting and near-end baffle size can be analyzed, supporting wetting process design and preventing material blockage. These are all related to the guide plates at the near and far ends of the overflow system and stable flow guidance. The flow design and optimization of the forming edge plate considers overflow system design, edge-pulling machine height adjustment, guide plate structure optimization, and process environment optimization. Based on simulation or analysis, the influence of guide plate structure, viscosity-temperature, and other factors on the glass flow pattern is studied to optimize edge plate thickness, improve edge plate flow pattern, enhance flow guidance stability, and increase process margin. Poor coordination between the viscosity of the overflow brick tip, surface tension in the thickness formation zone, the vertical position of the edge-pulling machine, and the cooling and traction force of the edge-pulling wheel can cause localized thinning (pitting) in the transition zone between the edge plate and the effective surface, affecting molding stability and increasing the risk of plate breakage. The edge-pulling machine generates an outward equivalent tensile force in the transition zone; surface tension generates an inward contraction force; as the height of the edge-pulling machine decreases, the width of the guide plate decreases, while viscosity and viscous resistance relatively increase, the tensile force relatively weakens, and the thickness of the transition zone tends to increase.

[0003] This study addresses the issues of sideplate and flow stability. Initially, the guide plate had considerable margin, but as mass production progressed, the flow pattern of the sideplate deteriorated, and stability worsened, mainly manifested as hollow cores, misalignment, uneven material distribution, and thinning. The structural dimensions of the guide plate tip affect the guide plate width, sideplate thickness, and flow stability. The optimal guide plate structure satisfies the similarity principle, with the glass flowing precisely from the guide plate tip, resulting in the most stable flow pattern; this is the standard guide plate design. Through analytical calculations, the influence of guide plate structural variations on guide plate width, sideplate thickness, and flow stability was studied, establishing relevant numerical relationships and distribution patterns. This research aims to provide technical support for optimizing guide plate structural design and improving sideplate flow.

[0004] In recent years, to improve production line efficiency, glass substrates have become increasingly larger and the number of leads has increased. Existing glass lead plates suffer from poor stability and can no longer meet the demands of higher generations and higher lead volumes. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a glass guide plate for manufacturing glass substrates using the overflow method, as well as its design method and system. It provides more scientific design and evaluation standards for the design of guide plates with large lead-out volumes, and can meet the technical requirements of high efficiency, targeting, digitalization, and parameterization, thereby meeting the needs of higher generations and higher lead-out volumes.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A method for designing a glass guide plate in the manufacture of overflow-type glass substrates includes the following steps:

[0008] The overflow system diversion plate of a mature overflow system was selected as a design reference. The geometric structural parameters, overflow surface width, upper and lower contraction width of the diversion plate, overflow brick slope height, overflow system overflow coefficient, and flow contraction ratio of the side plate without diversion plate were obtained respectively.

[0009] Establish the geometric similarity relationship of the diversion plate based on the slope height of the overflow brick;

[0010] Based on the geometric parameters of the diversion plate, the overflow surface width, and the overflow coefficient, a similarity relationship for the width of the diversion plate is established.

[0011] Based on the geometric parameters of the drainage plate and the width of the overflow surface, a similarity relationship is established for the critical contraction width of the drainage plate;

[0012] Based on the geometric parameters of the diversion plate, the designed outflow rate and the flow contraction coefficient, a similarity relationship for the flow rate of the critical side plate of the diversion plate is established.

[0013] Based on the similarity relationships of the overflow system's guide plate, glass substrate width, glass substrate thickness, geometric structure, guide plate width, critical contraction width, and critical side plate flow rate, the similarity relationships of the guide plate's side plate thickness and average side plate width are established, thus completing the overflow system's guide plate structural design.

[0014] Preferably, the specific formula for the geometric similarity relationship of the drainage plate is as follows:

[0015]

[0016]

[0017]

[0018]

[0019]

[0020] Among them, H 10 H 20 V10 V 20 Δ0 and Δ0 represent the standard first height, second height, first width, second width, and vertical contraction width of the designed flow guide plate, respectively, at which point the glass flows out stably from the tip of the designed flow guide plate; H 10ref H 20ref V 10ref V 20ref and Δ ref These represent the standard first height, second height, first width, second width, and upper and lower contraction widths of the reference drainage plate, at which point the glass flows out stably from the tip of the reference drainage plate; H V To design the overflow brick slope height; H Vref The reference overflow brick slope height.

[0021] Preferably, the specific formula for the similarity relationship of the widths of the drainage plates is as follows:

[0022]

[0023] Where H2 and V1 are the actual second height and first width of the designed diversion plate, respectively, W is the overflow surface width of the designed overflow system, and γ = 0.97113 is the overflow coefficient.

[0024] Preferably, the specific formula for the similarity relationship of the critical contraction width of the drainage plate is as follows:

[0025]

[0026] Where V2 is the actual second width of the designed diversion plate.

[0027] Preferably, the specific formula for the similarity relationship of the critical side plate flow rate of the diversion plate is as follows:

[0028]

[0029] Among them, Q E0 The average flow rate of the side plate without shrinkage is the flow rate of the side plate before entering the overflow brick and overflow ramp; ε = 0.95650 is the shrinkage ratio of the side plate flow rate without the guide plate.

[0030] The specific formula for the non-shrinkage average side plate flow rate is as follows:

[0031]

[0032] Where Q represents the glass substrate manufacturing design lead-out quantity, and W... G W represents the width of the glass substrate and the width of the overflow surface of the designed overflow system.

[0033] Preferably, the specific formula for the similarity relationship of the thickness of the diversion plate and the diversion side plate is as follows:

[0034]

[0035] Where T is the thickness of the glass substrate and β is the edge pulling factor;

[0036] The specific formula for the edge plate tension factor is as follows:

[0037]

[0038] Preferably, the specific formula for the similarity relationship of the average edge plate width is as follows:

[0039]

[0040] Preferably, the actual structural dimensions of the designed drainage plate satisfy the following similarity relationship:

[0041]

[0042] Where H1, H2, V1, V2, and Δ represent the actual first height, second height, first width, second width, and vertical contraction width of the designed drainage plate, respectively. At this point, the glass will deviate from the tip of the drainage plate and flow out. The greater the deviation, the worse the drainage stability. 10 H 20 V 10 V 20 Δ0 and Δ0 represent the first height, second height, first width, second width, and upper and lower contraction width of the design diversion plate, respectively, at which point the glass flows out stably from the tip of the reference diversion plate.

[0043] An overflow-method glass substrate manufacturing glass guide plate is manufactured based on the overflow-method glass substrate manufacturing glass guide plate design method described above.

[0044] An overflow method glass substrate manufacturing glass guide plate design system is used to implement the steps of the overflow method glass substrate manufacturing glass guide plate design method described above, including an acquisition module, a geometric structure similarity module, a guide plate width similarity module, a critical shrinkage width similarity module, a critical edge plate flow rate similarity module, and a design module.

[0045] The acquisition module is used to select a mature overflow system diversion plate as a design reference, and to acquire the geometric structural parameters, overflow surface width, upper and lower contraction width of the diversion plate, overflow brick slope height, overflow system overflow coefficient, and flow contraction ratio of the side plate without diversion plate of the reference diversion plate.

[0046] The geometric similarity module is used to establish a structural similarity relationship of the diversion plate based on the height of the overflow brick's inclined surface.

[0047] The guide plate width similarity module is used to establish the guide plate width similarity relationship based on the guide plate geometric parameters, overflow surface width and overflow coefficient;

[0048] The critical contraction width similarity module is used to establish a similarity relationship of the critical contraction width of the drainage plate based on the geometric parameters of the drainage plate and the width of the overflow surface.

[0049] The critical side plate flow similarity module is used to establish the flow similarity relationship of the critical side plate of the diversion plate based on the geometric parameters of the diversion plate, the design output and the flow contraction coefficient.

[0050] The design module is used to establish similarity relationships between the diversion plate thickness and average side plate width of the diversion plate based on the reference overflow system diversion plate, glass substrate specification width, glass substrate specification thickness, structural similarity relationship, diversion plate width similarity relationship, critical shrinkage width similarity relationship, and critical side plate flow rate similarity relationship, thereby completing the overflow system diversion plate structural design.

[0051] Compared with the prior art, the present invention has the following beneficial technical effects:

[0052] This invention provides a design method for a glass guide plate in the manufacture of overflow-type glass substrates. This method selects a guide plate from a mature overflow system as a design reference, and obtains parameters such as the geometric structure parameters, overflow surface width, upper and lower contraction width of the guide plate, overflow brick slope height, overflow system overflow coefficient, and flow contraction ratio of the side plate without a guide plate. Relationships such as geometric similarity, guide plate width similarity, critical contraction width similarity, and critical side plate flow similarity are established. Then, similarity relationships are established between the guide plate thickness and average side plate width. Based on these relationships, the structural dimensions of the designed guide plate are calculated, such as the first height, second height, first width, second width, and upper and lower contraction width of the guide plate, thereby completing the structural design of the new overflow system guide plate. Based on the similarity of the reference overflow system's drainage plate and geometry, drainage plate width, critical contraction width, and critical side plate flow rate, this method establishes a design benchmark for the drainage plate structure of a novel overflow system with improved outflow. It also takes into account the thickness of the drainage side plate and the average side plate width, which can meet the needs of higher generations and higher outflow.

[0053] The present invention also provides a glass substrate manufacturing overflow system, which enables the implementation of the steps of the above design method and meets the requirements of higher generation and higher extraction volume. Attached Figure Description

[0054] Figure 1 This is a front view schematic diagram of the kiln structure and electrode configuration provided in an embodiment of the present invention;

[0055] Figure 2This is a partial structural diagram of the overflow pull-down provided in an embodiment of the present invention;

[0056] Figure 3 This is a schematic diagram of the drainage plate structure provided in an embodiment of the present invention;

[0057] Figure 4 This is a schematic diagram illustrating the relationship between the width V2 of the diversion plate and the flow state of the side plate, provided in an embodiment of the present invention.

[0058] Figure 5 A schematic diagram showing the variation trend of the drainage plate width V2 with the average side plate thickness and the drainage plate width in an embodiment of the present invention;

[0059] Figure 6 A schematic diagram showing the relationship between the height H2 and width V1 of the diversion plate and the flow state of the side plate, provided for an embodiment of the present invention;

[0060] Figure 7 A schematic diagram illustrating the variation trends of the height H2 and width V1 of the diversion plate with the average side plate thickness and the width of the diversion plate, provided in an embodiment of the present invention;

[0061] Figure 8 This is a schematic diagram illustrating the changes in the glass flow pattern caused by the comprehensive optimization of the flow guide plate structure provided in this embodiment of the invention.

[0062] Figure 9 This is a flowchart illustrating a glass guide plate design method for manufacturing glass substrates using the overflow method according to the present invention.

[0063] In the attached diagram: 1 is the overflow brick; 2 is the overflow trough; 3 is the glass liquid supply device; 4 is the root of the overflow brick; 5 is the guide plate; 6 is the formed glass substrate; 7 is the downward pull direction of the glass substrate. Detailed Implementation

[0064] The present invention will be further described in detail below with reference to specific embodiments. These descriptions are for explanation purposes only and are not intended to limit the scope of the invention.

[0065] This invention provides a method for designing a glass guide plate in the manufacture of overflow-type glass substrates, such as... Figure 3 As shown, the steps are as follows:

[0066] The overflow system diversion plate of the mature overflow system was selected as the design reference. The geometric structural parameters, overflow surface width, critical contraction width without diversion plate, overflow brick slope height, overflow system overflow coefficient and flow contraction ratio of the side plate without diversion plate were obtained respectively.

[0067] The geometric similarity relationship of the diversion plate is established based on the height of the overflow brick slope, including the first height of the diversion plate, the second height of the diversion plate, the first width of the diversion plate, the second width of the diversion plate, and the upper and lower contraction width of the diversion plate, etc.

[0068] Based on the geometric parameters of the diversion plate (including the first height, second height, first width, and second width of the diversion plate), the overflow surface width, and the overflow coefficient, a similarity relationship between the widths of the diversion plates is established.

[0069] Based on the geometric parameters of the drainage plate (including the first height, second height, first width, and second width of the drainage plate) and the overflow surface width, a similarity relationship is established for the critical contraction width of the drainage plate.

[0070] Based on the geometric parameters of the diversion plate (including the first height, second height, first width, and second width of the diversion plate), the designed outflow and flow contraction coefficient, a similarity relationship of the flow rate of the critical side plate of the diversion plate is established.

[0071] Based on the similarity relationships of the overflow system's guide plate, glass substrate width, glass substrate thickness, structure, guide plate width, critical shrinkage width, and critical side plate flow rate, a similarity relationship between the guide plate's side plate thickness and average side plate width is established, thus completing the structural design of the new overflow system's guide plate.

[0072] Specifically, the formula for the similarity relationship of the drainage plate structure is as follows:

[0073]

[0074]

[0075]

[0076]

[0077]

[0078] Among them, H 10 H 20 V 10 V 20 Δ0 and Δ0 represent the standard first height, second height, first width, second width, and vertical contraction width of the designed flow guide plate, respectively, at which point the glass flows out stably from the tip of the designed flow guide plate; H 10ref H 20ref V 10ref V 20ref and Δ ref These represent the standard first height, second height, first width, second width, and upper and lower contraction widths of the reference drainage plate, at which point the glass flows out stably from the tip of the reference drainage plate; H V To design the overflow brick slope height; H Vref The reference overflow brick slope height.

[0079] Specifically, the formula for the similarity relationship of the width of the drainage plate is as follows:

[0080]

[0081] Where H2 and V1 are the actual second height and first width of the designed diversion plate, respectively, W is the overflow surface width of the designed overflow system, and γ = 0.97113 is the overflow coefficient.

[0082] Specifically, the formula for the similarity relationship of the critical contraction width of the drainage plate is as follows:

[0083]

[0084] Where V2 is the actual second width of the designed diversion plate.

[0085] Specifically, the formula for the similarity relationship of the critical side plate flow rate of the diversion plate is as follows:

[0086]

[0087] Among them, Q E0 The average side plate flow rate without shrinkage is the side plate flow rate before entering the overflow brick and overflow ramp; ε = 0.95650 is the side plate flow rate shrinkage ratio without a diversion plate.

[0088] Specifically, the formula for the average sideplate flow rate without shrinkage is:

[0089]

[0090] Where Q represents the glass substrate manufacturing design lead-out quantity, and W... G W represents the width of the glass substrate and the width of the overflow surface of the designed overflow system.

[0091] Specifically, the actual structural dimensions of the designed drainage plate satisfy the following similarity relationship:

[0092]

[0093] Where H1, H2, V1, V2, and Δ represent the actual first height, second height, first width, second width, and vertical contraction width of the designed drainage plate, respectively. At this point, the glass will deviate from the tip of the drainage plate and flow out. The greater the deviation, the worse the drainage stability. 10 H 20 V 10 V 20 Δ0 and Δ0 represent the first height, second height, first width, second width, and upper and lower contraction width of the design diversion plate, respectively, at which point the glass flows out stably from the tip of the reference diversion plate.

[0094] Specifically, the formula for the similarity relationship of the thickness of the drainage plate and the drainage side plate is as follows:

[0095]

[0096] Where T is the thickness of the glass substrate and β is the edge pulling factor.

[0097] Specifically, the formula for the edge plate tension factor is as follows:

[0098]

[0099] Specifically, the formula for the similarity relationship of average edge plate width is as follows:

[0100]

[0101] Specifically, the dimensions of the first height, second height, first width, second width, and upper and lower contraction width of the drainage plate are arbitrary dimensions H1, H2, V1, V2, and Δ. In this case, the stability of the glass drainage is worse than the standard, but it does not affect the actual engineering application.

[0102] Specifically, the dimensions of the drainage plate design, including the first height, second height, first width, second width, and upper and lower contraction widths, are H1, H2, V1, V2, and Δ, where at least one dimension deviates from the standard dimension H. 10 H 20 V 10 V 20 Within Δ0±20%, but the offset ratio is not necessarily equal. At this time, the stability of glass drainage is worse than the standard, but it does not affect the actual engineering application.

[0103] Specifically, the dimensions of the drainage plate design, including the first height, second height, first width, second width, and upper and lower contraction widths, deviate from the standard dimension H. 10 H 20 V 10 V 20 and Δ0±20% or less, and satisfy If the glass deviates from the tip of the guide plate and flows out, the glass flow stability will be worse than the standard, but it will not affect the actual engineering application.

[0104] Specifically, the dimensions of the drainage plate, including the first height, second height, first width, second width, and upper and lower contraction widths, meet the requirements of H. 10 H 20 V 10 V 20 If Δ0 is reached, the glass will just flow out from the tip of the designed flow guide plate (standard requirement), and the glass flow stability will meet the standard requirements.

[0105] Specifically, for a flow guide plate of any structural size, there exists a critical second width dimension, at which the glass just flows out from the edge of the second width. The specific formula for designing the critical second width dimension of the flow guide plate is as follows:

[0106]

[0107] Specifically, for a flow guide plate of any structural size, the specific formula for the width of the flow guide plate is:

[0108] When V2≤V 2J :W Y =γ×W J

[0109] When V2>V 2J :

[0110] This invention also provides a design method for a glass guide plate in overflow-type glass substrate manufacturing, comprising: an acquisition module, a geometric similarity module, a guide plate width similarity module, a critical shrinkage width similarity module, a critical side plate flow rate similarity module, and a design module. The acquisition module is used to select a guide plate from a mature overflow system as a design reference, and acquire parameters such as the geometric structure parameters, overflow surface width, upper and lower shrinkage widths of the guide plate, overflow brick slope height, overflow system overflow coefficient, and flow rate shrinkage ratio of the side plate without a guide plate. The geometric similarity module is used to establish a structural similarity relationship for the guide plate based on the overflow brick slope height, including the first height, second height, first width, second width, and upper and lower shrinkage widths of the guide plate. The guide plate width similarity module is used to establish a guide plate width similarity relationship based on the guide plate geometric structure parameters (including the first height, second height, first width, and second width), overflow surface width, and overflow coefficient. The critical shrinkage width similarity module is used to establish a design module based on the flow rate... The system employs several modules: a similarity module for the critical contraction width of the diversion plate (including the first height, second height, first width, and second width of the diversion plate) and the overflow surface width; a similarity module for the critical side plate flow rate (based on the geometric parameters of the diversion plate, including the first height, second height, first width, and second width of the diversion plate), the designed outflow rate, and the flow contraction coefficient); and a design module (based on the diversion plate of a reference overflow system, the specified width and thickness of the glass substrate, structural similarity relationships, diversion plate width similarity relationships, critical contraction width similarity relationships, and critical side plate flow rate similarity relationships) to establish similarity relationships for the thickness of the diversion side plate and the average side plate width, thus completing the structural design of the diversion plate for the new overflow system.

[0111] Example

[0112] like Figure 1 As shown, the overflow system is composed of an overflow brick 1 and a glass melt supply device 3 connected together; an overflow groove 2 is opened in the overflow brick 1, and the bottom of the overflow brick 1 is the root of the overflow brick 1; when the glass substrate is manufactured by molten overflow, in the forming process, the glass melt melted by the glass melting furnace is supplied to the glass melt supply device 3 in the molten overflow forming device, and overflows along the overflow groove 2 through both sides of the overflow brick 1, forming the glass substrate from below the root 4 of the overflow brick 1.

[0113] As molten glass propels from the near end to the far end of the overflow channel, it is propelled by mass force and pressure in the direction of travel, overcoming laminar viscous resistance and flowing downwards from the overflow weir. The fluid dynamics equations based on this principle integrate the effects of these forces and form the foundation of the overflow channel design. On the vertical overflow plane, the mass force and pressure are sufficiently large, and the viscosity is relatively low, resulting in minimal influence from lateral surface tension and almost no lateral contraction. On the inclined plane, the components of the mass force and pressure along the inclined plane decrease significantly, and the viscosity gradually increases, highlighting the effect of lateral surface tension and causing noticeable lateral contraction. Therefore, a platinum guide plate 5 is installed at both the near and far ends of the overflow brick's inclined plane to partially resist the lateral contraction of the glass.

[0114] The molten glass is almost completely wetted by platinum (in air). The horizontal wetting length provided by the wetting surface of the platinum guide plate is greater than the cut-off length of the overflow surface, spreading or thinning the glass flowing over it, effectively reducing the thickness at the longitudinal edges. The guide plate can counteract the effects of surface tension and volume forces on the width of the glass ribbon, thus widening it. Optimizing the shape of the guide plate can improve plate shrinkage and dispensing stability, but will not significantly affect the dispensing (flow rate) at the near and far ends of the glass ribbon.

[0115] Side plate distribution and equalization: The molten glass starts to be distributed from the overflow weir. No glass shrinkage occurs on the vertical surface of the overflow surface. The equalization of distribution depends on: (1) the bottom curve of the tank; (2) the coordination of flow rate, viscosity and muffle furnace inclination angle; (3) the stability of flow rate, viscosity and temperature; (4) the creep of the overflow brick over time; Glass shrinkage and accumulation: The molten glass starts to shrink from the slope. Due to the wetting and widening effect of the guide plate, it recovers to 0 shrinkage when the width reaches a certain range. The glass material on the guide plate accumulates to a certain extent. At this time, the side plate distribution is equivalent to the overflow weir. If the edge width is virtual at this time, the plate speed is the minimum; Distribution evolution and plate speed: The edge pulling machine moves down, the plate width decreases, the glass material on the side plate is diverted to the center, the flow rate of the side plate decreases, and the side plate distribution is less than the initial distribution of the overflow weir.

[0116] The temperatures of the platinum baffle and guide plate are crucial for crystallization of the lead plate, guide plate stability, and the condition of the side plates. The platinum baffle and guide plate possess extremely strong heat dissipation capabilities, with temperatures at the near and far ends significantly lower than in the middle. Because the near-end baffle is much larger than the far-end baffle, and the near-end glass travels a longer downward distance than the far-end, its temperature is considerably lower. Theoretically, a flat baffle minimizes its heat dissipation area; while complex flanges can increase strength, they also increase the heat dissipation area.

[0117] This study addresses the issues of sideplate and flow stability. Initially, the guide plate had considerable margin, but as mass production progressed, the flow pattern of the sideplate deteriorated, and stability worsened, mainly manifested as hollow cores, misalignment, uneven material distribution, and thinning. The structural dimensions of the guide plate tip affect the guide plate width, sideplate thickness, and flow stability. The optimal guide plate structure satisfies the similarity principle, with the glass flowing precisely from the guide plate tip, resulting in the most stable flow pattern; this is the standard guide plate design. Through analytical calculations, the influence of guide plate structural variations on guide plate width, sideplate thickness, and flow stability was studied, establishing relevant numerical relationships and distribution patterns. This research aims to provide technical support for optimizing guide plate structural design and improving sideplate flow.

[0118] like Figure 2 As shown, the lead plate serves as the forming base for the glass substrate. During the glass substrate pulling and forming process, the formed glass substrate 6 moves downward along the glass substrate pulling direction 7. (W in the figure) G W represents the width of the glass substrate. Y W is the width of the diversion plate, and W is the width of the overflow surface of the overflow brick. J Q is the critical contraction width of the drainage plate. E0 For the average sideplate flow rate without shrinkage, Q E0J W is the critical side plate flow rate of the diversion plate. E W represents the average edge width. During the downward forming process, molten glass gradually forms the glass substrate along the glass guide plate; in the width direction, from the center to both ends of the glass substrate, the thickness of the glass substrate in the middle is thin and uniform, and the thickness of the glass substrate gradually increases from the center to the two sides. G The target glass substrate width (i.e., the effective surface width of the glass substrate) is generally taken from the middle section with uniform thickness; the guide plate width W is... Y Remove glass substrate width W G This refers to the thickness of the side plate that needs to be removed. In this embodiment, the stability of the side plate drainage and the side plate thickness is controlled through the design of the drainage plate structure.

[0119] In recent years, to improve production line efficiency, glass substrate sizes have become increasingly larger, and lead-out rates have also increased. To meet the demands of higher generations and higher lead-out rates, and especially to ensure the stability of the glass lead plate, the optimization of the overflow system and lead plate structure is one of the core aspects of the design.

[0120] The specific formula for the similarity relationship of the drainage plate structure is as follows:

[0121]

[0122]

[0123]

[0124]

[0125]

[0126] Among them, H 10 H 20 V 10 V 20 Δ0 and Δ0 represent the standard first height, second height, first width, second width, and vertical contraction width of the designed flow guide plate, respectively, at which point the glass flows out stably from the tip of the designed flow guide plate; H 10ref H 20ref V 10ref V 20ref and Δ ref These represent the standard first height, second height, first width, second width, and upper and lower contraction widths of the reference drainage plate, at which point the glass flows out stably from the tip of the reference drainage plate; H V To design the overflow brick slope height; H Vref The reference overflow brick slope height.

[0127] The specific formula for the similarity relationship of the width of the drainage plate is as follows:

[0128]

[0129] Where H2 and V1 are the actual second height and first width of the designed diversion plate, respectively, W is the overflow surface width of the designed overflow system, and γ = 0.97113 is the overflow coefficient.

[0130] The specific formula for the similarity relationship of the critical contraction width of the drainage plate is as follows:

[0131]

[0132] Where V2 is the actual second width of the designed diversion plate.

[0133] The specific formula for the similarity relationship of the critical side plate flow rate of the diversion plate is as follows:

[0134]

[0135] Among them, Q E0The average side plate flow rate without shrinkage is the side plate flow rate before entering the overflow brick and overflow ramp; ε = 0.95650 is the side plate flow rate shrinkage ratio without a diversion plate.

[0136] The specific formula for the average flow rate of the non-shrinkage sideplate is:

[0137]

[0138] Where Q represents the glass substrate manufacturing design lead-out quantity, and W... G W represents the width of the glass substrate and the width of the overflow surface of the designed overflow system.

[0139] The actual structural dimensions of the designed drainage plate satisfy the following similarity relationship:

[0140]

[0141] Where H1, H2, V1, V2, and Δ represent the actual first height, second height, first width, second width, and vertical contraction width of the designed drainage plate, respectively. At this point, the glass may deviate from the tip of the drainage plate and flow out; the greater the deviation, the worse the drainage stability. 10 H 20 V 10 V 20 Δ0 and Δ0 represent the first height, second height, first width, second width, and upper and lower contraction width of the design diversion plate, respectively, at which point the glass flows out stably from the tip of the reference diversion plate.

[0142] The specific formula for the similarity relationship of the thickness of the diversion plate and the diversion side plate is as follows:

[0143]

[0144] Where T is the thickness of the glass substrate and β is the edge pulling factor.

[0145] The specific formula for the edge plate pull factor is:

[0146]

[0147] The specific formula for the similarity relationship of average edge plate width is as follows:

[0148]

[0149] For a flow guide plate of any structural size, there exists a critical second width dimension, at which the glass just flows out from the edge of the second width. The specific formula for designing the critical second width dimension of the flow guide plate is as follows:

[0150]

[0151] For a flow guide plate of any structural size, the specific formula for the width of the flow guide plate is:

[0152] When V2≤V 2J :W Y =γ×W J

[0153] When V2>V 2J :

[0154] according to Figure 4 As shown, when the width of the drainage plate V2 = V 20 At this point, the glass just flows out from the tip of the guide plate, and the glass trajectory is constrained by two boundaries, resulting in the most stable flow pattern and side plate thickness. When the width of the guide plate V... 2J <V2<V 20 At this time, the glass flows out from the right boundary of the guide plate tip, and the thickness of the side plate tends to be relatively thicker (by a small amount); when V2 = V 2J At the critical point, the glass flows out just from the widest part of the critical drain plate; when V2 = 0, it is equivalent to having no drain plate, and the width of the drain plate is severely reduced; when the width of the drain plate V2 > V 20 At this time, the glass flows out from the left edge of the tip of the drainage plate, and the thickness of the side plate tends to be relatively thin (trace amount). Figure 5 The diagram shows the variation trend of the guide plate width V2 with the average side plate thickness and guide plate width.

[0155] according to Figure 6 As shown, when the drainage plate size H2 = H 20 V2 = V 20 V1 = V 10 At this point, the glass just flows out from the tip of the guide plate, and the glass trajectory is constrained by two boundaries, resulting in the most stable flow pattern and side plate thickness. When the guide plate height H2 > H... 20 At this point, the critical contraction width and side plate thickness remain unchanged, the glass boundary deviates from the tip of the guide plate, and the flow regime tends to be unstable; when the guide plate height H2 <H 20 When the critical contraction width and side plate thickness remain unchanged, the glass boundary deviates from the tip of the guide plate, and the flow regime tends to be unstable; similarly, when the guide plate width V1 > V 10 Or V1 <V 10 At this time, the critical contraction width and the thickness of the side plate remain unchanged, the glass boundary deviates from the tip of the guide plate, and the flow state tends to be unstable. Figure 7 The diagram shows the variation trends of the diversion plate height H2 and diversion plate width V1 with the average side plate thickness and diversion plate width.

[0156] Figures 4-7 As shown, the dimensions of the drainage plate structure satisfy the following similarity relationship:

[0157]

[0158] The specific implementation process is as follows:

[0159] Table 1 shows the reference overflow system drain plate and the design overflow system drain plate structure and related parameters in this embodiment.

[0160] Table 1: Reference overflow system drain plate and design overflow system drain plate structure and related parameters in this embodiment

[0161]

[0162] Reference overflow system drain plate structural dimensions: H 10ref =371.11mm, H 20ref =81.78mm, V 10ref =49.90mm, V 20ref =129.10mm and Δ ref =13.0mm represents the standard first height, second height, first width, second width, and top and bottom contraction widths, referencing the overflow brick slope height H. Vref = 269.81 mm, at which point the glass flows steadily from the tip of the reference guide plate. Guide plate width W Y =2274mm, critical shrinkage width W J =2406mm, critical side plate flow rate Q E0J =73.98Kg / hr, average edge plate width and thickness W E =175mm, average edge plate thickness T E =1.81632mm.

[0163] Design the structural dimensions of the overflow system's drain plate: H 10 =400.53mm, H 20 =88.28mm, V 10 =53.87mm, V 20 =139.38mm and Δ0=14.0mm are the standard first height, second height, first width, second width, and upper and lower contraction widths, with reference to the overflow brick slope height H. V = 399.23mm, at which point the glass flows out stably from the tip of the reference guide plate. Guide plate width W Y =3054mm, critical shrinkage width W J =3214mm, critical side plate flow rate Q E0J =105.69Kg / hr, average edge plate width and thickness W E =175mm, average edge plate thickness T E = 1.78044mm (plate thickness specification is 0.5mm), average edge plate thickness T E = 2.02145mm (plate thickness specification is 0.7mm).

[0164] Calculations show that the dimensional relationships of the drainage plate structure satisfy the following formula:

[0165]

[0166]

[0167]

[0168]

[0169]

[0170] according to Figure 8 As shown, (1) the left side of the diversion plate does not have a wetting and widening effect on the inner glass, and the left side of the diversion plate has almost no effect on the glass flow state. Any adjustment to the shape and size of the left side of the diversion plate has almost no effect on the thickness of the side plate and the width of the diversion plate; (2) the right side of the diversion plate has a wetting and widening effect on the inner glass (overcoming the surface tension of the glass). Any adjustment to the shape and size of the right side of the diversion plate has a greater effect on the thickness of the side plate and the width of the diversion plate, but the structural adjustment is very limited due to the stability requirements of the glass flow state at the tip of the diversion plate; (3) the upper side of the diversion plate has a wetting and widening effect on the inclined glass of the overflow brick (overcoming the surface tension of the glass). The adjustment of the width V2 of the upper side of the diversion plate has a greater effect on the thickness of the side plate and the width of the diversion plate, but the structural adjustment is very limited due to the stability requirements of the glass flow state at the tip of the diversion plate; (4) the lower side of the diversion plate plays an important role in the stability of the side plate flow state (boundary constraint). The lower side of the diversion plate has almost no effect on the thickness of the side plate. Any adjustment to the shape and size H2 and V1 of the lower side of the diversion plate has a certain effect on the width of the diversion plate.

[0171] The method in this embodiment provides more scientific design and evaluation standards for the design of large-output drainage plates, which can meet the technical requirements of high efficiency, targeting, digitalization, and parameterization, thereby meeting the needs of higher generations and higher output.

[0172] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A method for designing a glass guide plate in the manufacture of overflow glass substrates, characterized in that, Includes the following steps, The overflow system diversion plate of a mature overflow system was selected as a design reference. The geometric structural parameters, overflow surface width, upper and lower contraction width of the diversion plate, overflow brick slope height, overflow system overflow coefficient, and flow contraction ratio of the side plate without diversion plate were obtained respectively. Establish the geometric similarity relationship of the diversion plate based on the slope height of the overflow brick; Based on the geometric parameters of the diversion plate, the overflow surface width, and the overflow coefficient, a similarity relationship for the width of the diversion plate is established. Based on the geometric parameters of the drainage plate and the width of the overflow surface, a similarity relationship is established for the critical contraction width of the drainage plate; Based on the geometric parameters of the diversion plate, the designed outflow rate and the flow contraction coefficient, a similarity relationship for the flow rate of the critical side plate of the diversion plate is established. Based on the similarity of the overflow system's drainage plate, glass substrate specifications, glass substrate specifications, geometric structure, drainage plate width, critical contraction width, and critical side plate flow rate, the similarity of the drainage plate's drainage side plate thickness and average side plate width is established, thus completing the overflow system's drainage plate structural design. The specific formula for the geometric similarity relationship of the drainage plate is as follows: in, , , , and These are the standard first height, second height, first width, second width, and upper and lower contraction widths of the design diversion plate, at which point the glass flows out stably from the tip of the design diversion plate; , , , and These are the reference drainage plate's standard first height, second height, first width, second width, and upper and lower contraction widths, at which point the glass flows out stably from the tip of the reference drainage plate; To design the slope height of the overflow brick; For reference, the slope height of the overflow brick; The specific formula for the similarity relationship of the critical side plate flow rate of the diversion plate is as follows: in, The average side plate flow rate without shrinkage is the side plate flow rate before entering the overflow brick overflow ramp. The flow rate reduction ratio is for the side plate without a drainage plate; The specific formula for the non-shrinkage average side plate flow rate is as follows: in, Design lead-out parameters for glass substrate manufacturing. The width of the glass substrate is specified. To design the overflow surface width of the overflow system; The specific formula for the similarity relationship of the width of the drainage plate is as follows: in, and These represent the actual second height and first width of the designed diversion plate, respectively. To design the overflow surface width of the overflow system, This is the overflow coefficient; The specific formula for the similarity relationship of the critical contraction width of the drainage plate is as follows: in, To design the actual second width of the diversion plate; The specific formula for the similarity relationship of the thickness of the diversion plate and the diversion side plate is as follows: in, For the thickness of the glass substrate, This refers to the edge tension factor of the edge plate. The specific formula for the similarity relationship of the average edge plate width is as follows: ； The actual structural dimensions of the designed drainage plate satisfy the following similarity relationship: in, , , , and The actual first height, second height, first width, second width, and upper and lower contraction width of the design diversion plate are respectively. At this time, the glass will deviate from the tip of the diversion plate and flow out. The greater the deviation, the worse the diversion stability. , , , and These are the design parameters for the standard first height, second height, first width, second width, and upper and lower contraction width of the diversion plate, at which point the glass flows out stably from the tip of the reference diversion plate.

2. The method for designing a glass guide plate for overflow glass substrate manufacturing according to claim 1, characterized in that, The specific formula for the edge plate pull factor is as follows: 。 3. A glass guide plate manufactured using an overflow method for glass substrates, characterized in that, This is a glass guide plate design method for manufacturing overflow glass substrates according to any one of claims 1 to 2.

4. A glass guide plate design system for overflow method glass substrate manufacturing, characterized in that, The steps for implementing the overflow method glass substrate manufacturing glass guide plate design method according to any one of claims 1-2 include an acquisition module, a geometric similarity module, a guide plate width similarity module, a critical shrinkage width similarity module, a critical side plate flow rate similarity module, and a design module. The acquisition module is used to select a mature overflow system diversion plate as a design reference, and to acquire the geometric structural parameters, overflow surface width, upper and lower contraction width of the diversion plate, overflow brick slope height, overflow system overflow coefficient, and flow contraction ratio of the side plate without diversion plate of the reference diversion plate. The geometric similarity module is used to establish a structural similarity relationship of the diversion plate based on the height of the overflow brick's inclined surface. The guide plate width similarity module is used to establish the guide plate width similarity relationship based on the guide plate geometric parameters, overflow surface width and overflow coefficient; The critical contraction width similarity module is used to establish a similarity relationship of the critical contraction width of the drainage plate based on the geometric parameters of the drainage plate and the width of the overflow surface. The critical side plate flow similarity module is used to establish the flow similarity relationship of the critical side plate of the diversion plate based on the geometric parameters of the diversion plate, the design output and the flow contraction coefficient. The design module is used to establish similarity relationships between the diversion plate thickness and average side plate width of the diversion plate based on the reference overflow system diversion plate, glass substrate specification width, glass substrate specification thickness, structural similarity relationship, diversion plate width similarity relationship, critical shrinkage width similarity relationship, and critical side plate flow rate similarity relationship, thereby completing the overflow system diversion plate structural design.

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