Glass runner plate for manufacturing glass substrate by overflow method, and design method and system therefor

Abstract

Disclosed in the present invention are a glass runner plate for manufacturing a glass substrate manufacturing by an overflow method, and a design method and system therefor. The structural design of a novel overflow system runner plate is finished by selecting a mature overflow system runner plate as a design reference, respectively obtaining the parameters of a reference runner plate, such as geometric structure parameters, the width of an overflow surface, the upper and lower contraction widths of the runner plate, the height of an overflow brick inclined plane, the overflow coefficient of an overflow system, and the flow contraction ratio at a side plate without a runner plate, respectively establishing relationships such as a geometric structure similarity, a guide plate width similarity, a critical contraction width similarity, and a critical side plate flow similarity, then establishing similarity relationships of the thickness of a running guide side plate of the runner plate and the average width of the side plate, and calculating the structural dimensions of the designed runner plate on the basis of a correspondence. A lead-out amount is established to improve the structural design reference of the novel overflow system runner plate; moreover, the thickness of the running guide side plate of the runner plate and the average width of the side plate both are balanced, and the requirements for a higher generation and a higher lead-out amount can be satisfied.

Description

A glass drain plate manufactured by overflow method glass substrate and its design method and system Technical Field

[0001] The invention belongs to the field of glass substrate manufacturing, and in particular to a glass guide plate manufactured by an overflow method glass substrate and a design method and system thereof. Background Art

[0002] The glass substrates used in the manufacturing of general flat-panel displays such as TFT-LCDs (thin-film transistor displays) and PDPs (plasma display panels) are manufactured using an overflow and pull-down process. The overflow and pull-down of glass undergo complex structural changes (physical size and molecular level). By establishing relevant dynamic models, the thickness distribution and force patterns below the overflow surface and root can be revealed, the causes of overflow brick wetting and the size of the proximal baffle can be analyzed, and the design of wetting process technology can be supported to avoid blockages. These are all related to the drainage plates at the far and near ends of the overflow system and stable drainage. The design and optimization of the flow pattern of the forming side plate considers the overflow system design, the height adjustment of the side drawing machine, the optimization of the drainage plate structure, and the optimization of the process environment. Based on simulation or analysis, the influence of factors such as the drainage plate structure, viscosity and temperature on the glass flow pattern is studied to optimize the side plate thickness, improve the side plate flow pattern, enhance the drainage stability, and expand the process margin. Poor coordination of overflow brick tip viscosity, surface tension in the thickness formation zone, top and bottom position of the edge drawing machine, edge drawing wheel cooling, and traction force may cause local thinning (pitting) in the transition zone between the edge plate and the effective surface, affecting forming stability and causing the risk of plate breakage. The edge drawing machine generates an outward equivalent pulling force in the transition zone; surface tension generates an inward contraction force; the height of the edge drawing machine decreases, the width of the guide plate decreases, and at the same time, the viscosity and viscous resistance increase, the pulling force weakens, and the thickness of the transition zone tends to increase.

[0003] Regarding the issues of side plates and flow stability. From the perspective of the initial guide plates, there is still a considerable margin, but as mass production continues, the flow state of the side plates begins to deteriorate and the stability becomes worse, which is mainly manifested in process problems such as hollow core, misalignment, large and small materials, and thinning. The structural dimensions of the tip of the guide plate affect the guide plate width, side plate thickness and flow stability. The optimal structure of the guide plate meets the similarity principle. The glass just flows out from the tip of the guide plate and the flow state is the most stable. This is the standard design of the guide plate. Through analytical calculation, the influence of the changes in the guide plate structure on the guide plate width, side plate thickness and flow stability is studied, and the relevant numerical relationship and distribution law are established. It is hoped that technical support will be provided for the optimization of the guide plate structure design and the improvement of the side plate flow state.

[0004] In recent years, to improve production line efficiency, glass substrates have become larger and larger, and the output volume has also increased. The existing glass guide plates have poor stability and can no longer meet the needs of higher generations and higher output volumes.

[0005] Summary of the Invention

[0006] In order to solve the problems existing in the prior art, the present invention provides an overflow method for manufacturing a glass drain plate from a glass substrate and a design method and system thereof, which provides more scientific design standards and evaluation standards for the design of drain plates with large output, and can meet the technical requirements of high efficiency and targeted, digital, and parameterized technology, thereby meeting the needs of higher generations and higher output.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A method for designing a glass drain plate for manufacturing a glass substrate using an overflow method comprises the following steps:

[0009] A mature overflow system drain plate was selected as a design reference, and the geometric structure parameters of the reference drain plate, overflow surface width, drain plate upper and lower contraction width, overflow brick slope height, overflow system overflow coefficient, and flow contraction ratio of the side plate without drain plate were obtained.

[0010] Establish the geometric structure similarity relationship of the drainage plate according to the slope height of the overflow brick;

[0011] According to the geometric parameters of the guide plate, the width of the overflow surface and the overflow coefficient, the similarity relationship of the guide plate width is established;

[0012] According to the geometric parameters of the guide plate and the width of the overflow surface, a similarity relationship of the critical contraction width of the guide plate is established;

[0013] Based on the geometric parameters of the guide plate, the designed discharge volume and the flow contraction coefficient, a similarity relationship between the critical side plate flow of the guide plate is established.

[0014] Based on the similarity relationship among the drain plate of the reference overflow system, the specification width of the glass substrate, the specification thickness of the glass substrate, the geometric structure, the similarity relationship among the drain plate width, the similarity relationship among the critical shrinkage width and the similarity relationship among the critical side plate flow, a similarity relationship between the thickness of the drain plate and the average side plate width is established to complete the structural design of the drain plate of the overflow system.

[0015] Preferably, the specific formula for the geometric structure similarity relationship of the guide plate is:

[0016] Among them, H 10 、H 20 、V 10 、V 20 and Δ0 are the first height, second height, first width, second width and upper and lower contraction widths of the designed guide plate, respectively. At this time, the glass just flows out stably from the tip of the designed guide plate; H 10ref 、H 20ref、V 10ref 、V 20ref and Δ ref The first height, second height, first width, second width and upper and lower contraction widths of the reference guide plate are respectively. At this time, the glass just flows out stably from the tip of the reference guide plate; H V H is the designed overflow brick slope height; Vref It is the reference overflow brick slope height.

[0017] Preferably, the specific formula for the similarity relationship of the guide plate width is:

[0018] Wherein, H2 and V1 are the actual second height and first width of the designed guide plate, respectively, W is the overflow surface width of the designed overflow system, and γ = 0.97113 is the overflow coefficient.

[0019] Preferably, the specific formula for the similarity relationship of the critical shrinkage width of the guide plate is:

[0020] Wherein, V2 is the actual second width of the designed guide plate.

[0021] Preferably, the specific formula for the similarity relationship between the critical side plate flow of the guide plate is:

[0022] Among them, Q E0 is the average side plate flow without contraction, that is, the side plate flow before entering the overflow brick overflow slope; ε = 0.95650 is the side plate flow contraction ratio without drainage plate;

[0023] The specific formula for the non-contracted average side plate flow is:

[0024] Among them, Q is the design lead-out amount of glass substrate manufacturing, W G is the width of the glass substrate specification, and W is the overflow surface width of the designed overflow system.

[0025] Preferably, the specific formula for the similarity relationship of the thickness of the drainage side plates of the drainage plate is:

[0026] Where T is the thickness of the glass substrate, β is the edge plate pulling factor;

[0027] The specific formula of the edge plate pull factor is:

[0028] Preferably, the specific formula of the average side plate width similarity relationship is:

[0029]

[0030] Preferably, the actual structural dimensions of the designed guide plate satisfy the following similarity relationship:

[0031] Among them, H1, H2, V1, V2 and Δ are the actual first height, second height, first width, second width and upper and lower contraction width of the designed guide plate respectively. At this time, the glass will deviate from the tip of the guide plate and flow out. The greater the deviation, the worse the drainage stability. 10 、H 20 、V 10 、V 20 and Δ0 are the standard first height, second height, first width, second width and upper and lower contraction widths of the designed guide plate, respectively. At this time, the glass just flows out stably from the tip of the reference guide plate.

[0032] A glass guide plate manufactured by using an overflow method for a glass substrate is manufactured based on any one of the above-mentioned design methods for manufacturing a glass guide plate by using an overflow method for a glass substrate.

[0033] A glass drain plate design system for manufacturing a glass substrate using an overflow method, for implementing any of the steps of the above-described method for designing a glass drain plate for manufacturing a glass substrate using an overflow method, comprising an acquisition module, a geometric structure similarity module, a drain plate width similarity module, a critical shrinkage width similarity module, a critical side plate flow similarity module, and a design module;

[0034] The acquisition module is used to select a mature overflow system drain plate as a design reference, and respectively obtain the geometric structure parameters of the reference drain plate, the overflow surface width, the upper and lower contraction width of the drain plate, the overflow brick slope height, the overflow system overflow coefficient, and the flow contraction ratio of the side plate without the drain plate;

[0035] The geometric structure similarity module is used to establish a similarity relationship between the drainage plate structure according to the overflow brick slope height;

[0036] The guide plate width similarity module is used to establish a guide plate width similarity relationship based on the guide plate geometric structure parameters, overflow surface width and overflow coefficient;

[0037] The critical contraction width similarity module is used to establish a similarity relationship of the critical contraction width of the guide plate according to the geometric structure parameters of the guide plate and the overflow surface width;

[0038] The critical side plate flow similarity module is used to establish a similarity relationship between the critical side plate flow of the guide plate according to the geometric structure parameters of the guide plate, the designed lead-out volume and the flow contraction coefficient;

[0039] The design module is used to establish a similarity relationship between the drain plate side plate thickness and the average side plate width based on the reference overflow system drain plate, glass substrate specification width, glass substrate specification thickness, structural similarity relationship, drain plate width similarity relationship, critical shrinkage width similarity relationship and critical side plate flow similarity relationship, thereby completing the overflow system drain plate structural design.

[0040] Compared with the prior art, the present invention has the following beneficial technical effects:

[0041] The present invention provides a method for designing a glass drain plate for manufacturing a glass substrate using an overflow method. The method selects a drain plate of a mature overflow system as a design reference, obtains parameters such as geometric structure parameters, overflow surface width, drain plate upper and lower contraction width, overflow brick slope height, overflow system overflow coefficient, and flow contraction ratio of a side plate without a drain plate of the reference drain plate, establishes relationships such as geometric structure similarity, drain plate width similarity, critical contraction width similarity, and critical side plate flow similarity, then establishes a similarity relationship between the drain plate side plate thickness and the average side plate width. Based on the corresponding relationships, the structural dimensions of the designed drain plate are calculated, such as parameters such as a first drain plate height, a second drain plate height, a first drain plate width, a second drain plate width, and a upper and lower contraction width of the drain plate, thereby completing the structural design of a new overflow system drain plate. This method is based on the similarity of the drain plate and geometric structure, drain plate width, critical contraction width and critical side plate flow of the reference overflow system. It establishes a design benchmark for the drain plate structure of a new overflow system with increased outflow, while taking into account the drain plate thickness and average side plate width, which can meet the needs of higher generations and higher outflow.

[0042] The present invention also provides an overflow system for manufacturing a glass substrate. This system can implement the steps of the above-mentioned design method, thereby meeting the requirements of higher generations and higher lead-out amounts. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] FIG1 is a front view schematic diagram of a kiln structure and electrode configuration according to an embodiment of the present invention;

[0044] FIG2 is a schematic diagram of a partial structure of an overflow pull-down device provided by an embodiment of the present invention;

[0045] FIG3 is a schematic diagram of the structure of a guide plate provided in an embodiment of the present invention;

[0046] FIG4 is a schematic diagram showing the relationship between the guide plate width V2 and the flow pattern change of the side plate according to an embodiment of the present invention;

[0047] FIG5 is a schematic diagram showing the variation trend of the guide plate width V2, the average side plate thickness, and the guide plate width according to an embodiment of the present invention;

[0048] FIG6 is a schematic diagram showing the relationship between the guide plate height H2 and the guide plate width V1 and the flow pattern change of the side plate according to an embodiment of the present invention;

[0049] FIG7 is a schematic diagram showing the changing trends of the guide plate height H2 and guide plate width V1, and the average side plate thickness and guide plate width according to an embodiment of the present invention;

[0050] FIG8 is a schematic diagram illustrating changes in glass drainage flow patterns due to comprehensive optimization of the drainage plate structure provided by an embodiment of the present invention;

[0051] FIG9 is a flow chart of a method for designing a glass guide plate for manufacturing a glass substrate using an overflow method according to the present invention.

[0052] In the accompanying drawings: 1 is the overflow brick; 2 is the overflow trough; 3 is the glass liquid feeding device; 4 is the root of the overflow brick; 5 is the guide plate; 6 is the formed glass substrate; 7 is the downward pulling direction of the glass substrate. DETAILED DESCRIPTION

[0053] The present invention will be further described in detail below with reference to specific embodiments, which are intended to explain the present invention rather than to limit it.

[0054] The present invention provides a method for designing a glass drain plate for manufacturing a glass substrate using an overflow method, as shown in FIG3 , comprising the following steps:

[0055] A mature overflow system drain plate was selected as a design reference. The geometric structure parameters, overflow surface width, critical shrinkage width without drain plate, overflow brick slope height, overflow system overflow coefficient, and flow contraction ratio of the side plate without drain plate of the reference drain plate were obtained.

[0056] According to the height of the overflow brick slope, the geometric structure similarity relationship of the drain plate is established, including the first height of the drain plate, the second height of the drain plate, the first width of the drain plate, the second width of the drain plate, and the upper and lower contraction width of the drain plate;

[0057] A similarity relationship between the guide plate width and the guide plate width is established based on the guide plate geometric parameters (including the first guide plate height, the second guide plate height, the first guide plate width, and the second guide plate width), the overflow surface width, and the overflow coefficient.

[0058] Based on the geometric structural parameters of the guide plate (including the first height of the guide plate, the second height of the guide plate, the first width of the guide plate, and the second width of the guide plate) and the overflow surface width, a similarity relationship of the critical contraction width of the guide plate is established;

[0059] Based on the geometric parameters of the guide plate (including the first height of the guide plate, the second height of the guide plate, the first width of the guide plate, the second width of the guide plate), the designed drainage volume and the flow contraction coefficient, a similarity relationship between the critical side plate flow of the guide plate is established;

[0060] Based on the reference overflow system drain plate, glass substrate specification width, glass substrate specification thickness, structural similarity relationship, drain plate width similarity relationship, critical shrinkage width similarity relationship and critical side plate flow similarity relationship, the similarity relationship between the drain plate drain side plate thickness and the average side plate width is established to complete the structural design of the new overflow system drain plate.

[0061] Specifically, the specific formula for the similarity relationship of the drainage plate structure is:

[0062] Among them, H 10 、H 20 、V 10 、V 20 and Δ0 are the first height, second height, first width, second width and upper and lower contraction widths of the designed guide plate, respectively. At this time, the glass just flows out stably from the tip of the designed guide plate; H 10ref 、H 20ref 、V 10ref 、V 20ref and Δ ref The first height, second height, first width, second width and upper and lower contraction widths of the reference guide plate are respectively. At this time, the glass just flows out stably from the tip of the reference guide plate; H V H is the designed overflow brick slope height; Vref It is the reference overflow brick slope height.

[0063] Specifically, the specific formula for the similarity relationship between the width of the guide plate is:

[0064] Wherein, H2 and V1 are the actual second height and first width of the designed guide plate, respectively, W is the overflow surface width of the designed overflow system, and γ = 0.97113 is the overflow coefficient.

[0065] Specifically, the specific formula for the similarity relationship of the critical shrinkage width of the guide plate is:

[0066] Wherein, V2 is the actual second width of the designed guide plate.

[0067] Specifically, the specific formula for the similarity relationship between the critical side plate flow of the guide plate is:

[0068] Among them, Q E0 is the average side plate flow without shrinkage, that is, the side plate flow before entering the overflow brick overflow slope; ε = 0.95650 is the side plate flow shrinkage ratio without drainage plate.

[0069] In particular, the specific formula for the average side plate flow without contraction is:

[0070] Among them, Q is the design lead-out amount of glass substrate manufacturing, W G is the width of the glass substrate specification, and W is the overflow surface width of the designed overflow system.

[0071] In particular, the actual structural dimensions of the designed guide plate satisfy the following similarity relationship:

[0072] Among them, H1, H2, V1, V2 and Δ are the actual first height, second height, first width, second width and upper and lower contraction width of the designed guide plate respectively. At this time, the glass will deviate from the tip of the guide plate and flow out. The greater the deviation, the worse the drainage stability. 10 、H 20 、V 10 、V 20 and Δ0 are the standard first height, second height, first width, second width and upper and lower contraction widths of the designed guide plate, respectively. At this time, the glass just flows out stably from the tip of the reference guide plate.

[0073] Specifically, the specific formula for the similarity relationship between the thickness of the drainage side plate of the drainage plate is:

[0074] Where T is the thickness of the glass substrate and β is the edge plate pulling factor.

[0075] In particular, the specific formula of the edge plate tension factor is:

[0076] Specifically, the specific formula for the similarity relationship of the average side panel width is:

[0077] Specifically, the first height, second height, first width, second width and upper and lower contraction widths of the guide plate are designed to be any dimensions H1, H2, V1, V2 and Δ. At this time, the glass drainage stability is worse than the standard, but it does not affect the actual engineering application.

[0078] Specifically, the dimensions of the first height, second height, first width, second width and upper and lower contraction width of the guide plate are H1, H2, V1, V2 and Δ, wherein at least any one of the dimensions deviates from the standard dimension H 10 、H 20 、V 10 、V 20 and Δ0±20% or less, but the offset ratio is not necessarily equal. At this time, the glass drainage stability is worse than the standard, but it does not affect the actual engineering application.

[0079] Specifically, the first height, second height, first width, second width and upper and lower contraction width of the guide plate are designed to deviate from the standard size H 10 、H 20 、V 10 、V 20 and within Δ0±20%, and meet If the proportional relationship is not achieved, the glass will deviate from the tip of the guide plate and flow out. At this time, the glass drainage stability is worse than the standard, but it does not affect the actual engineering application.

[0080] Specifically, the first height, second height, first width, second width and upper and lower contraction width of the guide plate are designed to meet H 10 、H 20 、V 10 、V 20 and Δ0, the glass just flows out from the tip of the designed drainage plate (standard requirement), and the glass drainage stability meets the standard requirements.

[0081] Specifically, for a guide plate of any structural size, there is 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 guide plate is:

[0082] In particular, for any structure size of the guide plate, the specific formula for the guide plate width is:

[0083] When V2≤V 2J :W Y =γ×W J

[0084] When V2>V 2J :

[0085] The present invention also provides a method for designing a glass drain plate for manufacturing a glass substrate using an overflow method, including: an acquisition module, a geometric structure similarity module, a drain plate width similarity module, a critical shrinkage width similarity module, a critical side plate flow similarity module and a design module. Acquisition module: used to select a mature overflow system drain plate as a design reference, and respectively obtain the geometric structure parameters, overflow surface width, drain plate upper and lower shrinkage width, overflow brick slope height, overflow system overflow coefficient and drain plate flow shrinkage ratio of the reference drain plate; Geometric structure similarity module: used to establish a drain plate structural similarity relationship based on the overflow brick slope height, including the first height of the drain plate, the second height of the drain plate, the first width of the drain plate, the second width of the drain plate and the upper and lower shrinkage width of the drain plate; Draw plate width similarity module: used to establish a drain plate width similarity relationship based on the geometric structure parameters of the drain plate (including the first height of the drain plate, the second height of the drain plate, the first width of the drain plate, the second width of the drain plate), the overflow surface width and the overflow coefficient; Critical shrinkage width similarity module: used to establish a drain plate width similarity relationship based on the drain plate geometric structure parameters (including the first height of the drain plate, the second height of the drain plate, the first width of the drain plate, the second width of the drain plate), the overflow surface width and the overflow coefficient; Critical shrinkage width similarity module: used to establish a drain plate width similarity relationship based on the drain plate geometric structure parameters (including the first height of the drain plate, the second height of the drain plate, the first width of the drain plate, the second width of the drain plate), the overflow surface width and the overflow coefficient; The critical contraction width similarity relationship of the guide plate is established based on the plate geometric structure parameters (including the first height of the guide plate, the second height of the guide plate, the first width of the guide plate, and the second width of the guide plate) and the overflow surface width; the critical side plate flow similarity module is used to establish the critical side plate flow similarity relationship of the guide plate according to the guide plate geometric structure parameters (including the first height of the guide plate, the second height of the guide plate, the first width of the guide plate, and the second width of the guide plate), the designed drainage volume and the flow contraction coefficient; the design module is used to establish the similarity relationship between the guide plate thickness and the average side plate width according to the reference overflow system guide plate, glass substrate specification width, glass substrate specification thickness, structural similarity relationship, guide plate width similarity relationship, critical contraction width similarity relationship and critical side plate flow similarity relationship, so as to complete the structural design of the guide plate of the new overflow system.

[0086] Example

[0087] As shown in Figure 1, the overflow system is composed of an overflow brick 1 and a glass liquid feeding device 3 connected together; an overflow trough 2 is provided 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 a molten overflow method, the molten glass melted by the glass melting furnace is supplied to the glass liquid feeding device 3 in the molten overflow molding device during the molding process, and overflows along the overflow trough 2 through both sides of the overflow brick 1, forming a glass substrate below the root 4 of the overflow brick 1.

[0088] As the glass melt is pushed from the proximal end to the distal end of the overflow trough, it is driven by the mass force and pressure in the running direction, overcomes the laminar viscous resistance and flows downward from the overflow weir. The fluid dynamics equation based on this principle integrates the effects of the above forces and is the basis for the design of the overflow trough. On the vertical surface of the overflow, the mass force and pressure are large enough, and the viscosity is relatively low, the effect of the lateral surface tension is very small, and there is almost no lateral shrinkage; on the inclined surface, the mass force and pressure components along the inclined surface become significantly smaller, and the viscosity gradually increases, the effect of the lateral surface tension becomes prominent, and a significant lateral shrinkage occurs. Therefore, a platinum material drain plate 5 is provided at the distal and proximal ends of the inclined surface of the overflow brick to partially resist the lateral shrinkage of the glass.

[0089] The molten glass almost completely wets the platinum (under air). The platinum-based guide plate's wetted surface provides a horizontal wetted length greater than the overflow surface's cutoff length, spreading or thinning the glass flowing over it, effectively reducing the thickness of the longitudinal edge. The guide plate offsets the effects of surface tension and volume forces on the width of the glass ribbon, widening it. Optimizing the guide plate's shape can improve sheet shrinkage and distribution stability, but will not significantly affect distribution (flow rate) at the far and near ends of the glass ribbon.

[0090] Side plate distribution and balance: The glass melt starts to be distributed from the overflow weir. No glass shrinkage occurs on the vertical surface of the overflow surface. The distribution balance depends on: (1) the bottom curve of the trough; (2) the coordination of flow rate, viscosity and the inclination angle of the muffle furnace; (3) the stability of flow rate, viscosity and temperature; (4) the gradual creep of the overflow brick over time; Glass shrinkage and aggregation: The glass melt starts to shrink from the inclined surface. Due to the wetting and widening effect of the guide plate, it returns to zero shrinkage when the width reaches a certain range. The glass material on the guide plate has a certain aggregation. At this time, the side plate distribution is equivalent to the overflow weir. If the virtual edge drawing width is used at this time, the plate speed is the minimum; Distribution evolution and plate speed: When the edge drawing machine moves downward, the plate width decreases, the side plate glass material is diverted to the center, and the side plate flow decreases. At this time, the side plate distribution is less than the initial distribution of the overflow weir.

[0091] The temperature of the platinum baffles and guide plates is related to guide plate crystallization, guide plate stability, and the condition of the side plates. Platinum baffles and guide plates have extremely strong heat dissipation capabilities, with temperatures at the near and far ends being much lower than those at the center. Because the near baffle is much larger than the far baffle, and the glass at the near end travels a greater distance downward than the far end, the near baffle temperature is much lower than the far baffle temperature. In theory, a flat baffle has the smallest heat dissipation area. While complex flanges can increase strength, they also increase heat dissipation area.

[0092] Regarding the issues of side plates and flow stability. From the perspective of the initial guide plates, there is still a considerable margin, but as mass production continues, the flow state of the side plates begins to deteriorate and the stability becomes worse, which is mainly manifested in process problems such as hollow core, misalignment, large and small materials, and thinning. The structural dimensions of the tip of the guide plate affect the guide plate width, side plate thickness and flow stability. The optimal structure of the guide plate meets the similarity principle. The glass just flows out from the tip of the guide plate and the flow state is the most stable. This is the standard design of the guide plate. Through analytical calculation, the influence of the changes in the guide plate structure on the guide plate width, side plate thickness and flow stability is studied, and the relevant numerical relationship and distribution law are established. It is hoped that technical support will be provided for the optimization of the guide plate structure design and the improvement of the side plate flow state.

[0093] As shown in FIG2 , the guide plate serves as the molding base of the glass substrate. During the process of pulling the glass substrate downward, the molded glass substrate 6 moves downward along the glass substrate pulling direction 7. G is the width of the glass substrate, W Y is the width of the drainage plate, W is the width of the overflow surface of the overflow brick, W J is the critical contraction width of the guide plate, Q E0 is the average side plate flow without contraction, Q E0J is the critical side plate flow of the guide plate, W E Is the average side plate width. During the down-drawing process, the molten glass flows along the glass guide plate to form a glass substrate. In the width direction, from the center to the two 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 formed from the middle to the two sides becomes thicker and thicker. G The target glass substrate specification width (i.e. the effective surface width of the glass substrate) is generally the middle part with uniform thickness; the guide plate width W Y Remove glass substrate specification width W G That is, the thickness of the side plate that needs to be removed. In this embodiment, the drainage of the side plate and the stability of the side plate thickness are controlled by the structural design of the drainage plate.

[0094] In recent years, to improve production line efficiency, glass substrates have become larger and larger, and the output volume has also increased. To meet the demands of higher generations and higher output volumes, especially to ensure the stability of the glass guide plate, the optimization of the overflow system and guide plate structure is one of the core designs.

[0095] The specific formula for the similarity relationship of the drainage plate structure is:

[0096] Among them, H 10 、H 20 、V 10 、V20 and Δ0 are the first height, second height, first width, second width and upper and lower contraction widths of the designed guide plate, respectively. At this time, the glass just flows out stably from the tip of the designed guide plate; H 10ref 、H 20ref 、H 10ref 、V 20ref and Δ ref The first height, second height, first width, second width and upper and lower contraction widths of the reference guide plate are respectively. At this time, the glass just flows out stably from the tip of the reference guide plate; H V H is the designed overflow brick slope height; Vref It is the reference overflow brick slope height.

[0097] The specific formula for the similarity relationship of the guide plate width is:

[0098] Wherein, H2 and V1 are the actual second height and first width of the designed guide plate, respectively, W is the overflow surface width of the designed overflow system, and γ = 0.97113 is the overflow coefficient.

[0099] The specific formula for the similarity relationship of the critical shrinkage width of the drainage plate is:

[0100] Wherein, V2 is the actual second width of the designed guide plate.

[0101] The specific formula for the similarity relationship of the critical side plate flow of the guide plate is:

[0102] Among them, Q E0 is the average side plate flow without contraction, that is, the side plate flow before entering the overflow brick overflow slope; ε = 0.95650 is the contraction ratio of the side plate flow without drainage plate.

[0103] The specific formula for the average side plate flow without contraction is:

[0104] Among them, Q is the design lead-out amount of glass substrate manufacturing, W G is the width of the glass substrate specification, and W is the overflow surface width of the designed overflow system.

[0105] The actual structural dimensions of the designed guide plate meet the following similarity relationship:

[0106] Among them, H1, H2, V1, V2 and Δ are the actual first height, second height, first width, second width and upper and lower contraction width of the designed guide plate respectively. At this time, the glass may deviate from the tip of the guide plate and flow out. The greater the deviation, the worse the drainage stability. 10 、H 20 、V 10、V 20 and Δ0 are the standard first height, second height, first width, second width and upper and lower contraction widths of the designed guide plate, respectively. At this time, the glass just flows out stably from the tip of the reference guide plate.

[0107] The specific formula for the similarity relationship of the drainage plate drainage side plate thickness is:

[0108] Where T is the thickness of the glass substrate and β is the edge plate pulling factor.

[0109] The specific formula of the edge plate pull factor is:

[0110] The specific formula for the similarity relationship of the average side panel width is:

[0111] For any structure size of the guide plate, there is 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 guide plate is:

[0112] For guide plates of any structural size, the specific formula for the width of the guide plate is:

[0113] When V2≤V 2J :W Y =γ×W J

[0114] When V2>V 2J :

[0115] As shown in FIG4, when the width of the guide plate V2 = V 20 When the glass just flows out from the tip of the guide plate, the glass trajectory is constrained by two boundaries, and the guide flow state and the side plate thickness are the most stable. 2J <V2<V 20 When V2=V 2J When V2=0, the glass just flows out from the widest part of the critical guide plate; when V2=0, it is equivalent to no guide plate, and the guide plate width is severely contracted; when the guide plate width V2>V 20 When , the glass flows out from the left edge of the guide plate tip, and the thickness of the side plate becomes relatively thin (a small amount). Figure 5 shows the trend of the change of the guide plate width V2 and the average side plate thickness and guide plate width.

[0116] As shown in Figure 6, when the guide plate size H2 = H 20 、V2=V 20 、V1=V 10When the glass just flows out from the tip of the guide plate, the glass trajectory is constrained by two boundaries, and the guide flow pattern and the side plate thickness are the most stable. 20 When 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; when the guide plate height H2<H 20 When the critical contraction width and the thickness of the side plate remain unchanged, the glass boundary deviates from the guide plate tip, and the flow state tends to be unstable; similarly, when the guide plate width V1>V 10 Or V1<V 10 When the critical contraction width and side plate thickness remain unchanged, the glass boundary deviates from the guide plate tip, and the flow state tends to be unstable. Figure 7 shows the trend of the guide plate height H2 and guide plate width V1 in relation to the average side plate thickness and guide plate width.

[0117] As shown in Figures 4 to 7, the structural dimensions of the guide plate satisfy the following similarity relationship:

[0118] The specific implementation process is as follows:

[0119] Table 1 shows the structures and related parameters of the reference overflow system drain plate and the designed overflow system drain plate of this embodiment.

[0120] Table 1: Reference overflow system drain plate and designed overflow system drain plate structure and related parameters of this embodiment

[0121] Reference overflow system drainage plate structure size: H 10ref =371.11mm, H 20ref =81.78mm, V 10ref =49.90mm, V 20ref =129.10mm and Δ ref =13.0mm is the standard first height, second height, first width, second width and upper and lower contraction width, refer to the overflow brick slope height H Vref = 269.81mm, at this time the glass just flows out stably from the tip of the reference guide plate. Guide plate width W Y =2274mm, critical shrinkage width W J =2406mm, critical side plate flow Q E0J =73.98Kg / hr, average side plate width thickness W E =175mm, average side plate thickness T E =1.81632mm.

[0122] Design overflow system drainage plate structure size: H 10 =400.53mm, H 20 =88.28mm, V 10 =53.87mm, V20 =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 this time the glass just 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 Q E0J =105.69Kg / hr, average side plate width thickness W E =175mm, average side 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).

[0123] According to empirical calculation, the relationship between the structural dimensions of the drainage plate satisfies the following formula:

[0124] As shown in Figure 8, (1) the left side of the guide plate has no wetting and widening effect on the inner glass, and the left side of the guide plate has almost no effect on the glass flow state. Any adjustment of the shape and size of the left side of the guide plate has almost no effect on the side plate thickness and the guide plate width; (2) the right side of the guide plate has a wetting and widening effect on the inner glass (overcoming the surface tension of the glass). Any adjustment of the shape and size of the right side of the guide plate has a greater impact on the side plate thickness and the guide plate width. However, due to the stability requirements of the glass flow state at the tip of the guide plate, the structural adjustment is very limited. (3) The upper part of the guide 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 part of the guide plate has a great influence on the thickness of the side plate and the width of the guide plate. However, due to the stability requirements of the glass flow at the tip of the guide plate, the structural adjustment is very limited; (4) The lower part of the guide plate plays an important role in the stability of the flow state of the side plate (boundary constraint). The lower part of the guide plate has almost no effect on the thickness of the side plate. Any adjustment of the shape and size H2 and V1 of the lower part of the guide plate has a certain influence on the width of the guide plate.

[0125] Through the method of this embodiment, more scientific design standards and evaluation standards are provided for the design of large-output drainage plates, which can meet the technical requirements of high efficiency and targeted, digital, and parameterized technology, thereby meeting the needs of higher generations and higher outputs.

[0126] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention.

Claims

1. A method for designing a glass drain plate for manufacturing a glass substrate using an overflow method, characterized in that: The following steps are included: The drain plate of a mature overflow system was selected as a design reference, and the geometric structure parameters, overflow surface width, upper and lower contraction width of the drain plate, overflow brick slope height, overflow system overflow coefficient and flow contraction ratio of the side plate without drain plate were obtained respectively. The geometric structure similarity relationship of the drainage plate is established according to the slope height of the overflow brick; According to the geometric structure parameters of the guide plate, the width of the overflow surface and the overflow coefficient, the similarity relationship of the guide plate width is established; According to the geometric structure parameters of the guide plate and the width of the overflow surface, the similarity relationship of the critical contraction width of the guide plate is established; According to the geometric structure parameters of the guide plate, the designed drainage volume and the flow contraction coefficient, the similarity relationship of the critical side plate flow of the guide plate is established. According to the similarity relationship among the drain plate of the reference overflow system, the specification width of the glass substrate, the specification thickness of the glass substrate, the geometric structure, the similarity relationship among the drain plate width, the similarity relationship among the critical shrinkage width and the similarity relationship among the critical side plate flow, the similarity relationship among the drain plate side plate thickness and the average side plate width is established to complete the structural design of the drain plate of the overflow system.

2. The method for designing a glass guide plate for manufacturing a glass substrate by an overflow method according to claim 1, characterized in that: The specific formula for the similarity relationship of the guide plate geometric structure is: Among them, H 10 , H 20 、V 10 、V 20 and Δ0 are the standard first height, second height, first width, second width and upper and lower contraction widths of the designed guide plate, respectively. At this time, the glass just flows out stably from the tip of the designed guide plate; H 10ref , H 20ref 、V 10ref 、V 20ref and Δ ref are the first height, second height, first width, second width and upper and lower contraction widths of the reference guide plate. At this time, the glass just flows out stably from the tip of the reference guide plate; H V H is the designed overflow brick slope height; Vref It is the reference overflow brick slope height.

3. The method for designing a glass guide plate for manufacturing a glass substrate by an overflow method according to claim 1, characterized in that: The specific formula for the similarity relationship of the guide plate width is: Among them, H2 and V1 are the actual second height and first width of the designed guide plate, respectively, W is the overflow surface width of the designed overflow system, and γ=0.97113 is the overflow coefficient.

4. The method for designing a glass guide plate for manufacturing a glass substrate by an overflow method according to claim 1, characterized in that: The specific formula for the similarity relationship of the critical shrinkage width of the guide plate is: Wherein, V2 is the actual second width of the designed guide plate.

5. The method for designing a glass guide plate for manufacturing a glass substrate by an overflow method according to claim 1, characterized in that: The specific formula for the similarity relationship between the critical side plate flow of the guide plate is: Among them, Q E0 is the average side plate flow without shrinkage, that is, the side plate flow before entering the overflow brick overflow slope; ε = 0.95650 is the shrinkage ratio of the side plate flow without drainage plate; The specific formula of the non-contracted average side plate flow is: Where Q is the design lead-out amount of glass substrate manufacturing, W G is the specification width of the glass substrate, and W is the overflow surface width of the designed overflow system.

6. The method for designing a glass guide plate for manufacturing a glass substrate by an overflow method according to claim 1, characterized in that: The specific formula for the similarity relationship of the thickness of the drainage side plate of the drainage plate is: Among them, T is the thickness of the glass substrate, and β is the edge plate pulling factor; The specific formula of the edge plate pull factor is:

7. The method for designing a glass guide plate for manufacturing a glass substrate by an overflow method according to claim 1, characterized in that: The specific formula for the similarity relationship of the average side plate width is:

8. The method for designing a glass guide plate for manufacturing a glass substrate by an overflow method according to claim 1, characterized in that: The actual structural dimensions of the designed guide plate satisfy the following similarity relationship: Among them, H1, H2, V1, V2 and Δ are the actual first height, second height, first width, second width and upper and lower contraction width of the designed guide plate, respectively. At this time, the glass will deviate from the tip of the guide plate and flow out. The greater the deviation, the worse the guide stability. 10 , H 20 、V 10 、V 20 and Δ0 are the standard first height, second height, first width, second width and upper and lower contraction widths of the designed guide plate respectively. At this time, the glass just flows out stably from the tip of the reference guide plate.

9. A glass drain plate manufactured by overflow method glass substrate, characterized in that: The invention is made based on the design method of manufacturing a glass guide plate by an overflow method glass substrate as described in any one of claims 1 to 8.

10. A system for designing a glass drain plate for manufacturing a glass substrate by an overflow method, characterized in that: The steps for implementing the method for designing a glass guide plate for manufacturing a glass substrate by an overflow method as described in any one of claims 1 to 8 include an acquisition module, a geometric structure similarity module, a guide plate width similarity module, a critical shrinkage width similarity module, a critical side plate flow similarity module, and a design module; The acquisition module is used to select a mature overflow system drain plate as a design reference, and respectively obtain the geometric structure parameters of the reference drain plate, the overflow surface width, the upper and lower contraction width of the drain plate, the overflow brick slope height, the overflow system overflow coefficient, and the flow contraction ratio of the side plate without the drain plate; The geometric structure similarity module is used to establish a similarity relationship between the drainage plate structure according to the overflow brick slope height; The guide plate width similarity module is used to establish a guide plate width similarity relationship according to the guide plate geometric structure 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 guide plate according to the geometric structure parameters of the guide plate and the overflow surface width; The critical side plate flow similarity module is used to establish a similarity relationship between the critical side plate flow of the guide plate according to the geometric structure parameters of the guide plate, the designed lead-out volume and the flow contraction coefficient; The design module is used to establish a similarity relationship between the thickness of the drainage side plate and the average side plate width of the drainage plate based on the reference overflow system drainage plate, glass substrate specification width, glass substrate specification thickness, structural similarity relationship, drainage plate width similarity relationship, critical shrinkage width similarity relationship and critical side plate flow similarity relationship, so as to complete the overflow system drainage plate structure design.

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