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

Abstract

To provide a glass drainage plate for manufacturing a glass substrate by an overflow method, and a design method and system therefor.SOLUTION: A design method comprises selecting a mature overflow system drainage plate 5 as a design reference, respectively obtaining parameters of the reference drainage plate, such as geometric structure parameters, the width of an overflow surface, upper and lower contraction widths of the drainage plate, the height of an inclined plane of an overflow brick 1, an overflow coefficient of the overflow system, and a flow contraction ratio of an edge plate in a case without the drainage plate. Relationships such as geometric structure similarity, guide plate width similarity, critical contraction width similarity, and critical edge plate flow similarity are respectively established, and a similarity relationship of a thickness of an edge plate of the drainage plate and an average edge plate width is established. Based on a corresponding relationship, structural dimensions of the designed drainage plate are calculated.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention belongs to the field of manufacturing glass substrates, and specifically relates to a glass drainage plate for manufacturing an overflow method glass substrate, and a design method and system thereof.

Background Art

[0002] Glass substrates used in the field of flat panel display manufacturing, such as general TFT-LCD (Thin Film Transistor Display) and PDP (Plasma Display Panel), are manufactured by the overflow drop-down method. The overflow and traction pull-down of glass undergo complex structural changes (physical dimensions and molecular level). By constructing relevant kinetic models, the overflow surface, root thickness distribution, and stress law are clarified, the causes of wetting of the overflow furnace and size materials of the proximal baffle are analyzed, the technical design of the wetting process is supported, and the occurrence of clogging can be prevented. All of these are related to the proximal and distal drainage plates of the overflow system and stable drainage. In the design and optimization of the flow pattern of the forming edge plate, considerations include the design of the overflow system, height adjustment of the edge platter, structural optimization of the drainage plate, and optimization of the process environment. Based on simulation or analysis, the influence law of elements such as the structure of the drainage plate, viscosity, and temperature on the flow state of glass is studied, the thickness of the edge plate is optimized, the flow state of the edge plate is improved, the stability of drainage is enhanced, and the process margin is expanded. Inappropriate adjustment of the tip viscosity of the overflow furnace, surface tension in the thickness formation region, vertical position of the edge platter, cooling of the edge pull wheel, and traction force can cause local thinning (dents) in the transition region between the edge plate and the effective surface, affecting the stability of forming and potentially leading to the risk of plate breakage. The edge platter forms an outward equivalent tensile force in the transition region, and the surface tension forms an inward contraction force. When the height of the edge platter decreases, the width of the guide plate decreases, while the viscosity and viscous resistance relatively increase, the traction force relatively weakens, and the thickness of the transition region tends to increase.

[0003] To address the problems of the edge plate and the stability of the flow state, although there is still a considerable margin in the initial guide plate, as mass production continues, the flow state of the edge plate begins to deteriorate, the stability decreases, and process problems such as mainly hollow cores, misalignment, material size, and thinning become apparent. The structural dimensions at the tip of the drainage plate affect the width of the guide plate, the thickness of the edge plate, and the stability of the flow state. The optimal structure of the drainage plate satisfies the principle of similarity, and the glass just flows out from the tip of the drainage plate, and the flow state is the most stable. This is the standard design of the drainage plate. Through analytical calculations, study the influence law of the structural changes of the drainage plate on the width of the guide plate, the thickness of the edge plate, and the stability of the flow state, establish the relevant numerical relationships and distribution laws, and provide technical support for the optimization of the structural design of the drainage plate and the improvement of the flow state of the edge plate.

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, in order to improve the efficiency of the production line, the size of the glass substrate has been increasing, and the drawing amount has also been increasing. The stability of the glass drainage plate in the prior art is low, and it can no longer meet the requirements of higher generations and larger drawing amounts.

Means for Solving the Problems

[0005] The object of the present invention is to disclose a glass drainage plate for manufacturing a glass substrate by the overflow method, its design method and system to solve the problems existing in the prior art, and to provide more scientific design criteria and evaluation criteria for the design of a drainage plate with a large drawing amount that can meet the technical requirements of high efficiency, targeting, digitization, and parameterization, so as to meet the demands of higher generations and larger drawing amounts.

[0006] In order to achieve the above object, the present invention adopts the following technical means. The present invention selects a drainage plate of a mature overflow system as a reference for design, and respectively obtains the geometric structure parameters of the reference drainage plate, the width of the overflow surface, the vertical contraction width of the drainage plate, the inclined surface height of the overflow flue, the overflow coefficient of the overflow system, and the edge plate flow rate contraction ratio in the case without a drainage plate; establishes a similarity relationship of the geometric structure of the drainage plate based on the inclined surface height of the overflow flue; establishes a similarity relationship of the guide plate width of the drainage plate based on the geometric structure parameters of the drainage plate, the width of the overflow surface, and the overflow coefficient; establishes a similarity relationship of the critical contraction width of the drainage plate based on the geometric structure parameters of the drainage plate and the width of the overflow surface; establishes a similarity relationship of the critical edge plate flow rate of the drainage plate based on the geometric structure parameters of the drainage plate, the designed draw amount, and the flow rate contraction coefficient; and based on the drainage plate of the reference overflow system, the standard width of the glass substrate, the standard thickness of the glass substrate, the similarity relationship of the geometric structure, the similarity relationship of the guide plate width, the similarity relationship of the critical contraction width, and the similarity relationship of the critical edge plate flow rate, establishes a similarity relationship of the drainage edge plate thickness and the average edge plate width of the drainage plate, thereby completing the design of the drainage plate structure of the overflow system, and discloses a design method of a glass drainage plate for manufacturing an overflow method glass substrate.

[0007] The specific formula of the similarity relationship of the geometric structure of the drainage plate is as follows:

Number

[0008] The specific formula for the similarity relationship of the guide plate width of the drainage plate is as follows,

Number

[0009] The specific formula for the similarity relationship of the critical contraction width of the drainage plate is as follows,

Number

[0010] The specific formula for the similarity relationship of the critical edge plate flow rate of the drainage plate is as follows,

Number

Number

[0011] The specific formula for the similar relationship of the drainage edge plate thickness of the drainage plate is as follows.

Number

Number

[0012] The specific formula for the similar relationship of the average edge plate width is as follows.

Number

[0013] The actual structural dimensions of the designed drainage plate satisfy the following similar relationship.

Number

[0014] In addition, the present invention discloses a glass drainage plate for manufacturing an overflow method glass substrate, which is manufactured based on the above design method.

[0015] In addition, the present invention is used to implement the steps of the above design method, and includes 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. The acquisition module selects the drainage plate of a mature overflow system as a reference for design, and respectively acquires the geometric structure parameters of the reference drainage plate, the width of the overflow surface, the upper and lower shrinkage widths of the drainage plate, the inclined surface height of the overflow flue, the overflow coefficient of the overflow system, and the edge plate flow rate shrinkage ratio in the case of no drainage plate. The geometric structure similarity module is used to establish the structural similarity relationship of the drainage plate based on the inclined surface height of the overflow flue. The guide plate width similarity module is used to establish the similarity relationship of the guide plate width of the drainage plate based on the geometric structure parameters of the drainage plate, the width of the overflow surface, and the overflow coefficient. The critical shrinkage width similarity module is used to establish the similarity relationship of the critical shrinkage width of the drainage plate based on the geometric structure parameters of the drainage plate and the width of the overflow surface. The critical edge plate flow rate similarity module is used to establish the similarity relationship of the critical edge plate flow rate of the drainage plate based on the geometric structure parameters of the drainage plate, the designed extraction amount, and the flow rate shrinkage coefficient. The design module establishes the similarity relationship between the edge plate thickness and the average edge plate width of the drainage plate based on the drainage plate of the reference overflow system, the standard width of the glass substrate, the standard thickness of the glass substrate, the structural similarity relationship, the guide plate width similarity relationship, the critical shrinkage width similarity relationship, and the critical edge plate flow rate similarity relationship, and completes the design of the drainage plate structure of the overflow system. A design system for a glass drainage plate for manufacturing a glass substrate by the overflow method is disclosed.

Advantages of the Invention

[0016] The present invention has the following beneficial effects. The design method of the glass drainage plate for manufacturing glass substrates by the overflow method according to the present invention is to select the drainage plate of a mature overflow system as a reference for design, and obtain the geometric structure parameters of the reference drainage plate, the width of the overflow surface, the vertical contraction width of the drainage plate (the width of contraction at the upper and lower parts), the height of the inclined surface of the overflow brick, the overflow coefficient of the overflow system, the edge plate flow rate contraction ratio in the case without a drainage plate, etc. respectively. Then, establish the relationships such as similarity of geometric structure, similarity of guide plate width, similarity of critical contraction width, similarity of critical edge plate flow rate, etc. respectively, and further construct the similarity relationship between the drainage edge plate thickness and the average edge plate width of the drainage plate. Based on these corresponding relationships, calculate the structural dimension parameters of the designed drainage plate, such as the first height, the second height, the first width, the second width of the drainage plate, the vertical contraction width of the drainage plate, etc., and complete the structural design of the drainage plate of the new overflow system. This method can establish the structural design criteria of the drainage plate of the new overflow system for improving the drawing amount based on the similarity of the drainage plate and geometric structure, guide plate width, critical contraction width, critical edge plate flow rate of the reference overflow system, and at the same time, by considering the thickness of the drainage edge plate and the width of the average edge plate of the drainage plate, it can meet the requirements of higher generations and larger drawing amounts.

[0017] In addition, the glass substrate manufacturing overflow system according to the present invention can realize the steps of the above design method by the system, and can meet the requirements of higher generations and larger drawing amounts.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

[0019] Hereinafter, the present invention will be described in more detail based on specific embodiments, but the present invention is not limited thereto.

[0020] As shown in FIG. 3, the design method of the glass drainage plate for manufacturing a glass substrate by the overflow method according to the present invention includes the following steps:

[0021] Select the drainage plate of the mature overflow system as the reference for design (reference drainage plate), and obtain the geometric structure parameters of the reference drainage plate, the width of the overflow surface, the critical contraction width without the drainage plate, the inclined surface height of the overflow lenga, the overflow coefficient of the overflow system, and the edge plate flow contraction ratio without the drainage plate, etc. respectively.

[0022] Based on the inclined surface height of the overflow lenga, establish the similarity relationship of the geometric structure of the drainage plate. The similarity relationship includes the first height of the drainage plate, the second height of the drainage plate, the first width of the drainage plate, the second width of the drainage plate, and the up and down contraction width of the drainage plate, etc.

[0023] Based on the geometric structure parameters of the drainage plate (including the first height of the drainage plate, the second height of the drainage plate, the first width of the drainage plate, and the second width of the drainage plate), the width of the overflow surface, and the overflow coefficient, establish the similarity relationship of the guide plate width of the drainage plate.

[0024] Based on the geometric structure parameters of the drainage plate (including the first height of the drainage plate, the second height of the drainage plate, the first width of the drainage plate, and the second width of the drainage plate) and the width of the overflow surface, establish the similarity relationship of the critical contraction width of the drainage plate.

[0025] Based on the geometric structure parameters of the drainage plate (including the first height of the drainage plate, the second height of the drainage plate, the first width of the drainage plate, and the second width of the drainage plate), the designed discharge and the flow contraction coefficient (or design the discharge and the flow contraction coefficient), establish the similarity relationship of the critical edge plate flow of the drainage plate.

[0026] Based on the drainage plate of the reference overflow system, the standard width (specification width) of the glass substrate, the standard thickness (specification thickness) of the glass substrate, the structural similarity relationship, the similarity relationship of the guide plate width, the similarity relationship of the critical shrinkage width, and the similarity relationship of the critical edge plate flow rate, establish the similarity relationship between the drainage edge plate thickness and the average edge plate width of the drainage plate, and complete the drainage plate structure design of the new overflow system.

[0027] Specifically, the specific formula for the structural similarity relationship of the drainage plate is as follows:

Number

[0028] Specifically, the specific formula for the similarity relationship of the guide plate width of the drainage plate is:

Number

[0029] Specifically, the specific formula for the similarity relationship of the critical shrinkage width of the drainage plate is as follows:

Number

[0030] Specifically, the specific formula for the similarity relationship of the critical edge plate flow rate of the drainage plate is:

Number

[0031] In particular, the specific formula for the average edge plate flow rate without shrinkage is:

Number

[0032] In particular, the actual structural dimensions of the designed drainage plate satisfy the following similarity relationship:

Number

[0033] Specifically, the specific formula for the similar relationship of the drainage edge plate thickness of the drainage plate is:

Number

[0034] In particular, the specific formula for the stretching coefficient of the edge plate is:

Number

[0035] Specifically, the specific formula for the similar relationship of the average edge plate width is:

Number

[0036] Specifically, the dimensions (sizes) of the designed first height, second height, first width, second width, and vertical contraction width of the drainage plate are any dimensions H1, H2, V1, V2, and Δ. At this time, the drainage stability of the glass deteriorates compared with the standard, but it has no impact on actual engineering applications.

[0037] Specifically, the dimensions of the designed first height, second height, first width, second width, and vertical contraction width of the drainage plate are H1, H2, V1, V2, and Δ. Here, at least one of the dimensions deviates within ±20% of the standard dimensions H 10 , H 20 , V 10 , V 20 , Δ0, but at the same time, the ratio of the deviation (deviation) is not necessarily equal. At this time, the drainage stability of the glass deteriorates compared with the standard, but it has no impact on actual engineering applications.

[0038] Specifically, for the dimensions of the first height, second height, first width, second width, and vertical contraction width of the drainage plate, when they deviate within ±20% of the standard dimensions H 10 , H 20 , V 10 , V 20 , Δ0, and satisfy the proportional relationship of H1 / H 10 = H2 / H 20 = V1 / V 10 = V2 / V 20 = Δ / Δ0, at this time the glass flows out deviating from the tip of the drainage plate, and the drainage stability of the glass deteriorates compared to the standard, but it has no impact on actual engineering applications.

[0039] Specifically, for the dimensions of the first height, second height, first width, second width, and vertical contraction width of the drainage plate, when they are H 10 , H 20 , V 10 , V 20 , Δ0, the glass just flows out from the tip of the designed drainage plate (standard requirement). At this time, the drainage stability of the glass meets the standard requirements.

[0040] Specifically, for a drainage plate with any structural dimensions, there exists a critical second width dimension, and at this time the glass just flows out from the edge of the second width. The specific formula for the critical second width dimension of the designed drainage plate is as follows:

Number

[0041] In particular, for a drainage plate with any structural dimensions, the specific formula for the guide plate width of the drainage plate is as follows:

Number

[0042] In addition, the design method of the glass drainage plate for manufacturing a glass substrate by the overflow method according to the present invention includes 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. The acquisition module is used to select the drainage plate of a mature overflow system as a reference for design, and respectively acquire parameters such as the geometric structure parameters of the reference drainage plate, the width of the overflow surface, the vertical shrinkage width of the drainage plate, the height of the inclined surface of the overflow bricks, the overflow coefficient of the overflow system, and the edge plate flow rate shrinkage ratio when there is no drainage plate. The geometric structure similarity module is used to establish the structural similarity relationship of the drainage plate based on the height of the inclined surface of the overflow bricks, and includes the first height of the drainage plate, the second height of the drainage plate, the first width of the drainage plate, the second width of the drainage plate, and the vertical shrinkage width of the drainage plate. The guide plate width similarity module is used to establish the similarity relationship of the guide plate width of the drainage plate based on the geometric structure parameters of the drainage plate (including the first height of the drainage plate, the second height of the drainage plate, the first width of the drainage plate, and the second width of the drainage plate), the width of the overflow surface, and the overflow coefficient. The critical shrinkage width similarity module is used to establish the similarity relationship of the critical shrinkage width of the drainage plate based on the geometric structure parameters of the drainage plate (including the first height, second height, first width, and second width of the drainage plate) and the width of the overflow surface. The critical edge plate flow rate similarity module is used to establish the similarity relationship of the critical edge plate flow rate of the drainage plate based on the geometric structure parameters of the drainage plate (including the first height, second height, first width, and second width of the drainage plate), the designed draw amount, and the flow rate shrinkage coefficient.The design module is used to complete the design of the drainage plate structure of the new overflow system by establishing the similarity relationship between the drainage edge plate thickness and the average edge plate width of the drainage plate based on the drainage plate of the reference overflow system, the standard width of the glass substrate, the standard thickness of the glass substrate, the similarity relationship of the structure, the similarity relationship of the guide plate width, the similarity relationship of the critical shrinkage width, and the similarity relationship of the critical edge plate flow rate of the glass substrate.

[0043] (Example) As shown in FIG. 1, the overflow system is configured by connecting an overflow brick 1 and a glass liquid supply device 3. An overflow tank 2 is provided in the overflow brick 1, and the bottom of the overflow brick 1 is its root. When manufacturing a glass substrate by the melting overflow method, the glass liquid melted in a glass melting furnace in the forming process is supplied to the glass liquid supply device 3 in the glass melting overflow forming device, overflows from both sides of the overflow brick 1 along the overflow tank 2, and a glass substrate is formed below the root 4 of the overflow brick 1.

[0044] In the process of the glass melt advancing from the proximal end to the distal end of the overflow tank, it is propelled by the mass force and pressure in the advancing direction, overcomes the viscous resistance of the laminar flow and advances, and flows out downward from the overflow weir. The hydrodynamic equation based on this principle combines the effects of the above acting forces and forms the basis for the design of the overflow tank. On the vertical plane of the overflow, the mass force and pressure are large enough and the viscosity is relatively low, so the influence of the lateral surface tension is small and there is almost no lateral shrinkage. On the inclined plane, the mass force and the component force of the pressure in the inclined plane direction are significantly reduced, the viscosity gradually increases, the action of the lateral surface tension becomes prominent, and obvious lateral shrinkage occurs. Therefore, platinum drainage plates 5 are respectively provided at the near and far ends of the inclined plane of the overflow brick and are used to partially resist the lateral shrinkage of the glass.

[0045] The glass melt almost completely wets platinum (in an air environment). The horizontal wetting length brought about by the wetting surface (wetted surface) of the platinum drainage plate is longer than the cutoff length of the overflow surface, spreading or thinning the glass flowing thereon and actually reducing the thickness of the longitudinal edge. The drainage plate can cancel out the influence of surface tension and body force on the width of the glass ribbon and widen the width of the glass ribbon. By optimizing the shape of the drainage plate, the shrinkage and distribution stability of the plate width can be improved to a certain extent, but it does not have a great influence on the distribution (flow rate) of the far ends of the glass ribbon.

[0046] The distribution and balance of the edge plate are as follows: The glass melt starts to distribute from the overflow weir, and no shrinkage of the glass occurs on the vertical surface of the overflow surface. The balance of distribution depends on the following: (1) the curve of the tank bottom; (2) the harmony of the flow rate, viscosity, and inclination angle of the muffle furnace; (3) the stability of the flow rate, viscosity, and temperature; (4) the gradual creep of the overflow bricks over time, etc. The shrinkage of the glass and the accumulation of materials are as follows: The glass melt starts to shrink from the inclined surface. Due to the spreading effect caused by the wetting of the drainage plate, when the width reaches a certain level, the shrinkage returns to zero, and a certain accumulation of the glass material on the drainage plate occurs. At this time, the distribution of the edge plate is almost the same as that of the overflow weir. At this time, if it is the virtual edge pull width, the plate speed is minimized. The change in distribution and the plate speed are as follows: When the edge plier descends, the plate width decreases, the glass material on the edge plate drains to the center, and the flow rate of the edge plate decreases. At this time, the distribution of the edge plate becomes smaller than the initial distribution of the overflow weir.

[0047] The temperatures of the platinum baffle and the drainage plate are related to the crystal precipitation of the guide plate, the stability of drainage, and the state of the edge plate. The platinum baffle and the drainage plate have very high heat dissipation capabilities, and the temperatures at the far and near ends are much lower than those at the central part. The size of the near-end baffle is much larger than that of the far-end baffle. Since the glass at the near end moves downward for a longer distance than that at the far end, the temperature of the near-end baffle is much lower than that of the far-end baffle. Theoretically, when the baffle is flat, its heat dissipation area is the smallest. While increasing the strength through complex flange processing, the heat dissipation area also increases.

[0048] To address the problems of the edge plate and the stability of the flow state, although there is still a considerable margin in the initial guide plate, as mass production continues, the flow state of the edge plate begins to deteriorate and the stability decreases. This mainly appears as process problems such as hollow cores, misalignment, different materials in terms of size, and thin walls. The structural dimensions at the tip of the drainage plate affect the width of the guide plate, the thickness of the edge plate, and the stability of the flow state. The optimal structure of the drainage plate satisfies the principle of similarity, with the glass just flowing out from the tip of the drainage plate and the flow state being the most stable. This is the standard design of the drainage plate. Through analytical calculations, study the law of the influence of the structural changes of the drainage plate on the width of the guide plate, the thickness of the edge plate, and the stability of the flow state, establish the relevant numerical relationships and distribution laws, and hope to provide technical support for the optimization of the structural design of the drainage plate and the improvement of the flow state of the edge plate.

[0049] As shown in Figure 2, as the basis for the forming of the glass substrate, during the down-drawing forming process of the glass substrate, the formed glass substrate 6 moves downward along the down-drawing direction 7 of the glass substrate. In the figure, W G is the standard width of the glass substrate, W Y is the guide plate width of the drainage plate, W is the width of the overflow surface of the overflow glass, W J is the critical shrinkage width of the drainage plate, Q E0 is the average edge plate flow rate without shrinkage, QE0J is the critical edge plate flow rate of the drainage plate, and W E is the average edge plate width. In the down-drawing forming of a glass substrate, the molten glass liquid gradually forms the glass substrate along the glass guide plate. In the width direction, starting from the center of the glass substrate to both ends, the thickness of the middle part of the glass substrate is thin and uniform, and the thickness of the glass substrate gradually increases from the center to both sides. W G is the standard width of the target glass substrate (i.e., the effective surface width of the glass substrate), and generally takes the part with a uniform middle thickness. The guide plate width W of the drainage plate Y minus the standard width W of the glass substrate G is the thickness of the edge plate to be removed. This embodiment precisely controls the drainage of the edge plate and the stability of the edge plate thickness through the structural design of the drainage plate.

[0050] In recent years, in order to improve the efficiency of the production line, the size of the glass substrate has been increasing, and the drawing amount has also been increasing. In order to meet the requirements of higher generations and larger drawing amounts, especially to meet the requirement of ensuring the stability of the glass guide plate, the optimization of the overflow system and the structure of the drainage plate is one of the cores of the design.

[0051] The specific formula for the structural similarity relationship of the drainage plate is as follows:

Equation

[0052] The specific formula for the similar relationship of the guide plate width of the drainage plate is as follows:

Number

[0053] The specific formula for the similar relationship of the critical contraction width of the drainage plate is as follows:

Number

[0054] The specific formula for the similar relationship of the critical edge plate flow rate of the drainage plate is as follows:

Number

[0055] In particular, the specific formula for the average edge plate flow rate without contraction is as follows:

Number

[0056] The actual structural dimensions of the designed drainage plate satisfy the following similar relationships:

Number

[0057] The specific formula for the similar relationship of the drainage edge plate thickness of the drainage plate is as follows:

Number

[0058] The specific formula for the stretching factor of the edge plate is as follows:

Number

[0059] The specific formula for the similar relationship of the average edge plate width is:

Number

[0060] For a drainage plate with any structural dimensions, 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 the critical second width dimension of the designed drainage plate is as follows:

Number

[0061] For a drainage plate with any structural dimensions, the specific formula for the guide plate width of the drainage plate is as follows:

Number

[0062] According to Figure 4, when the width V2 of the drainage plate = V 20 the glass just flows out from the tip of the drainage plate, and the trajectory of the glass is restricted by two boundaries, and the drainage flow state and the thickness of the edge plate are the most stable. When the width of the drainage plate is V 2J <V2<V 20 the glass flows out from the boundary on the right side of the tip of the drainage plate, and the thickness of the edge plate tends to be relatively thick (slightly). When V2 = V 2J the glass just flows out from the widest part of the critical drainage plate. When V2 = 0, it is equivalent to having no drainage plate, and the guide plate width is significantly reduced. When the width V2 of the drainage plate > V 20 the glass flows out from the boundary on the left side of the tip of the drainage plate, and the thickness of the edge plate tends to be relatively thin (slightly). Figure 5 is a schematic diagram showing the change trends of the width V2 of the drainage plate, the average edge plate thickness, and the guide plate width.

[0063] According to Figure 6, the dimensions of the drainage plate are H2 = H 20 , V2 = V 20 , V1 = V 10When this occurs, the glass just flows out from the tip of the drainage plate, and the trajectory of the glass is restricted by two boundaries, and the flow state of the drainage and the thickness of the edge plate are the most stable. The height H2 of the drainage plate > H 20 When H2 < H, the critical shrinkage width and the thickness of the edge plate remain unchanged, but the boundary of the glass deviates from the tip of the drainage plate, and the flow state tends to become unstable. The height H2 of the drainage plate < H 20 Similarly, when H2 < H, the critical shrinkage width and the thickness of the edge plate remain unchanged, but the boundary of the glass deviates from the tip of the drainage plate, and the flow state tends to become unstable. Similarly, when the width V1 of the drainage plate > V 10 or V1 < V 10 When this occurs, the critical shrinkage width and the thickness of the edge plate remain unchanged, but the boundary of the glass deviates from the tip of the drainage plate, and the flow state tends to become unstable. Figure 7 is a schematic diagram showing the change trends of the height H2 of the drainage plate, the width V1 of the drainage plate, the average edge plate thickness, and the guide plate width.

[0064] As shown in Figures 4 to 7, the structural dimensions of the drainage plate satisfy the following similar relationships:

Number

[0065] The specific implementation process is as follows.

[0066] Table 1 shows the structures and related parameters of the drainage plate of the reference overflow system and the drainage plate of the designed overflow system in this embodiment.

Table 1

[0067] The structural dimensions of the drainage plate of the reference overflow system are: H 10ref = 371.11 mm, H 20ref = 81.78 mm, V 10ref = 49.90 mm, V 20ref=129.10mm, and Δ ref =13.0mm are the standard first height, second height, first width, second width, and vertical contraction width. The inclined surface height of the reference overflow lintel is H Vref =269.81mm. At this time, the glass just stably flows out from the plate tip of the reference drainage plate. The width W of the guide plate Y =2274mm, the critical contraction width W J =mm, the critical edge plate flow rate Q E0J =73.98k G / Hr, the average edge plate width W E =175mm, the average edge plate thickness T E =1.81632mm.

[0068] The drainage plate structure dimensions of the designed overflow system are: H 10 =400.53mm, H 20 =88.28mm, V 10 =53.87mm, V 20 =139.38mm, Δ0 = 14.0mm are the standard first height, second height, first width, second width, and vertical contraction width. The inclined surface height of the designed overflow lintel is H V =399.23mm. At this time, the glass has been designed to stably flow out from the plate tip of the drainage plate. The width W of the guide plate Y =3054mm, the critical contraction width W J =3214mm, the critical edge plate flow rate Q E0J =105.69k G / Hr, the average edge plate width W E =175mm, the average edge plate thickness T E =1.78044mm (when the plate thickness standard is 0.5mm), the average edge plate thickness T E =2.02145mm (when the plate thickness standard is 0.7mm).

[0069] Through empirical calculations, the relationship between the structural dimensions of the drainage plate satisfies the following formula.

Number

[0070] As shown in Fig. 8, (1) the left part of the drainage plate does not exert a wetting expansion effect on the inner glass, and the left part of the drainage plate hardly affects the flow state of the glass. Any adjustment of the shape and dimension of the left part of the drainage plate hardly affects the thickness of the edge plate and the width of the guide plate. (2) The right part of the drainage plate exerts a wetting expansion effect on the inner glass (overcoming the surface tension), and any adjustment of the shape and dimension of the right part of the drainage plate greatly affects the thickness of the edge plate and the width of the guide plate. However, it is restricted by the stability requirement of the glass flow state at the tip of the drainage plate, and the structural adjustment is very limited. (3) The upper part of the drainage plate exerts a wetting expansion effect on the glass on the inclined surface of the overflow glass (overcoming the surface tension), and the adjustment of the width V2 of the upper part of the drainage plate greatly affects the thickness of the edge plate and the width of the guide plate. However, it is restricted by the stability requirement of the glass flow state at the tip of the drainage plate, and the structural adjustment is very limited. (4) The lower part of the drainage plate plays an important role in the stability of the flow state of the edge plate (constraint of the boundary). The lower part of the drainage plate hardly affects the thickness of the edge plate, and any adjustment of the shape and dimensions H2, V1 of the lower part of the drainage plate has a certain influence on the width of the guide plate.

[0071] Through the method of this embodiment, more scientific design criteria and evaluation criteria are provided for the design of the drainage plate with a large drawing amount, meeting the technical requirements of high efficiency, targeting, digitization, and parameterization, and being able to meet the demands of higher generations and larger drawing amounts.

[0072] The above embodiments are for explaining the technical problems of the present invention and do not limit the present invention. Although the present invention has been described in detail based on the above embodiments, those of ordinary skill in the art can change or equivalently replace the specific embodiments of the present invention. As long as these changes or equivalent replacements do not depart from the spirit and scope of the present invention, they are included within the protection scope of the claims of the present invention under application.

Explanation of Signs

[0073] 1 Overflow kiln 2 Overflow tank 3 Glass liquid supply device 4 Root of the overflow kiln 5 Drainage plate 6 Formed glass substrate 7 Downward pulling direction of the glass substrate

Claims

1. Selecting a drainage plate of a mature overflow system as a reference for design, and respectively obtaining the geometric structure parameters of the reference drainage plate, the width of the overflow surface, the vertical contraction width of the drainage plate, the inclined surface height of the overflow brick, the overflow coefficient of the overflow system, and the edge plate flow contraction ratio without the drainage plate; Establishing a similarity relationship of the geometric structure of the drainage plate based on the inclined surface height of the overflow brick; Establishing a similarity relationship of the guide plate width of the drainage plate according to the geometric structure parameters of the drainage plate, the width of the overflow surface and the overflow coefficient; Establishing a similarity relationship of the critical shrinkage width of the drainage plate according to the geometric structure parameters of the drainage plate and the width of the overflow surface; Establishing a similarity relationship of the critical edge plate flow rate of the drainage plate according to the geometric structure parameters of the drainage plate, the designed withdrawal amount and the flow rate contraction coefficient; A design method for a glass drainage plate for manufacturing glass substrates using an overflow method, which establishes a similarity relationship between the drainage edge plate thickness and the average edge plate width of the drainage plate based on the drainage plate, the standard width of the glass substrate, the standard thickness of the glass substrate, the similarity relationship between the geometric structure, the similarity relationship between the guide plate width, the similarity relationship between the critical shrinkage width, and the similarity relationship between the critical edge plate flow rate of the reference overflow system, and completes the drainage plate structure design of the overflow system.

2. The specific formula of the similarity relationship of the geometric structure of the drainage plate is as follows: [0010] Here, H １０ , H ２０ , V １０ , V ２０ and Δ ０ are the standard first height, second height, first width, second width, and vertical contraction width of the drainage plate to be designed, respectively. At this time, the glass flows out from the plate tip of the designed drainage plate in a stable manner, and H １０ｒｅｆ , H ２０ｒｅｆ , V １０ｒｅｆ , V ２０ｒｅｆ and Δ ｒｅｆ are the standard first height, second height, first width, second width, and vertical contraction width of the reference drainage plate, respectively. At this time, the glass flows out from the plate tip of the reference drainage plate in a stable manner, and H Ｖ is the height of the inclined surface of the overflow brick to be designed, and H Ｖｒｅｆ The method for designing a glass drainage plate for manufacturing a glass substrate by the overflow method according to claim 1 , wherein:

3. The specific formula of the similarity relationship of the guide plate width of the drainage plate is as follows: [0025] Here, H ２ and V １ 2. The method for designing a glass drainage plate for manufacturing an overflow method glass substrate according to claim 1, wherein: γ is the actual second height and first width of the drainage plate to be designed, W is the width of the overflow surface of the overflow system to be designed, and γ=0.97113 is the overflow coefficient.

4. The specific formula of the similarity relationship of the critical contraction width of the drainage plate is as follows: [0030] Here, V ２ The method for designing a glass drainage plate for manufacturing an overflow method glass substrate according to claim 1, wherein x is an actual second width of the drainage plate to be designed.

5. The specific formula of the similarity relationship of the critical edge plate flow rate of the drainage plate is as follows: [0045] Here, Q Ｅ０ is the average edge plate flow rate without contraction, i.e., the edge plate flow rate before entering the overflow slope of the overflow brick, and ε=0.95650 is the edge plate flow rate contraction ratio without the drainage plate; The specific formula for the average edge plate flow rate without shrinkage is: [0050] Here, Q is the designed withdrawal amount in the glass substrate manufacturing, W Ｇ 2. The method for designing a glass drainage plate for manufacturing an overflow method glass substrate according to claim 1, wherein W is the standard width of the glass substrate, and W is the width of the overflow surface of the overflow system to be designed.

6. The specific formula of the similarity relationship of the drainage edge plate thickness of the drainage plate is as follows: [006] where T is the nominal thickness of the glass substrate, β is the stretch factor of the edge plate, The specific formula of the stretch coefficient of the edge plate is as follows: [0070] A method for designing a glass drainage plate for manufacturing an overflow glass substrate according to claim 1.

7. The specific formula of the similarity relationship of the average edge plate width is as follows: [0080] A method for designing a glass drainage plate for manufacturing an overflow glass substrate according to claim 1.

8. The actual structural dimensions of the designed drainage plate satisfy the following similarity relationships: [0090] Here, H １ , H ２ , V １ , V ２ and Δ are the actual first height, second height, first width, second width, and vertical contraction width of the drainage plate to be designed, respectively. At this time, the glass may be shifted from the tip of the drainage plate and flow out. The greater the shift, the lower the stability of the drainage. １０ , H ２０ , V １０ , V ２０ and Δ ０ are the standard first height, second height, first width, second width and vertical contraction width of the drainage plate to be designed, respectively, and at this time, the glass just stably flows out from the tip of the reference drainage plate.

9. A glass drainage plate for manufacturing an overflow method glass substrate, manufactured based on the design method according to any one of claims 1 to 8.

10. A method for implementing the steps of the design method according to any one of claims 1 to 8, The method includes: 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 similarity module, and a design module; The acquisition module selects a drainage plate of a mature overflow system as a design reference, and respectively obtains the geometric structure parameters of the reference drainage plate, the width of the overflow surface, the upper and lower contraction width of the drainage plate, the inclined surface height of the overflow brick, the overflow coefficient of the overflow system, and the edge plate flow contraction ratio when there is no drainage plate; The geometric structure similarity module is used to establish a structural similarity relationship of the drainage plate based on the inclined surface height of the overflow brick; The similarity module of the guide plate width is used to establish a similarity relationship of the guide plate width of the drainage plate according to the geometric structure parameters of the drainage plate, the width of the overflow surface and the overflow coefficient; The similarity module of the critical shrinkage width is used to establish a similarity relationship of the critical shrinkage width of the drainage plate according to the geometric structure parameters of the drainage plate and the width of the overflow surface; The similarity module of the critical edge plate flow rate is used to establish a similarity relationship of the critical edge plate flow rate of the drainage plate based on the geometric structure parameters of the drainage plate, the designed withdrawal amount, and the flow contraction coefficient; The design module establishes a similarity relationship between the edge plate thickness and the average edge plate width of the drainage plate based on the drainage plate, the standard width of the glass substrate, the standard thickness of the glass substrate, the similarity relationship of structure, the similarity relationship of the guide plate width, the similarity relationship of the critical shrinkage width, and the similarity relationship of the critical edge plate flow rate of the reference overflow system, thereby completing the drainage plate structure design of the overflow system, a design system for a glass drainage plate for manufacturing glass substrates using an overflow method.

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