Overflow method glass substrate forming edge clamping device and its working method

Abstract

The present disclosure discloses an edge clamping device for glass substrate forming by an overflow method and a working method thereof. The device includes a primary clamping unit and a secondary tensioning unit. Both the primary clamping unit and the secondary tensioning unit clamp both side edge portions of the glass plate. The primary clamping unit is disposed above the secondary tensioning unit and closer to the flow guide plate than the secondary tensioning unit. The present invention forms a better state of the glass edge plate through the combined action of clamping and tensioning, promotes the adhesion of the glass edge portion in a high-temperature state, improves the problem that the clamping position of the clamp edge plate is too low, and solves the quality defects of the edge plate such as poor adhesion caused by temperature drop of the glass plate in the clamping area, a deviated edge with a cavity, and a sudden change in thickness between the edge plate and the effective transition area, and improves the clamping and production stability of the formed edge portion.

Description

Technical Field

[0001] The present invention belongs to the field of manufacturing glass substrates by the overflow method, and particularly relates to an overflow method glass substrate forming edge clamping device and its working method.

Background Art

[0002] In the manufacture of glass substrates by the overflow method, glass in a high-temperature molten state flows out from both sides of the overflow device, converges at the tip of the brick, and joins sufficiently to form a glass plate with smooth both sides. However, generally due to the action of the surface tension of the glass, the glass plate contracts inward after flowing down from the overflow device. Therefore, an edge plier device is used to clamp both sides of the glass plate, and it is rapidly cooled to form a thick edge portion, suppressing the inward contraction of the glass plate and ensuring the effective plate width of the glass substrate. At the same time, the glass is prevented from contacting other objects within the effective region to ensure the smoothness of the glass surface.

Summary of the Invention

Problems to be Solved by the Invention

[0003] However, as liquid crystal displays evolve to higher generations, in the manufacture of glass substrates, the expansion of the plate width and the increase in the take-up speed increase the difficulty of controlling the forming quality. Due to the rapid cooling of the edge plier, first, cavitation occurs in the edge portion, that is, poor joining or edge displacement is likely to occur, and at the same time, the clamping of the edge plier and the inward contraction of the glass plate act together, causing a sudden change in thickness and making it easy to form thin or weak regions. Second, the cooling air of the edge plier easily affects the temperature distribution in the drainage region, leading to the occurrence of crystallization.

Means for Solving the Problems

[0004] The present invention aims to solve the problems in the prior art and disclose an edge clamping device for glass substrate forming by the overflow method and its working method, which can promote the bonding of the glass edge part in a high-temperature state, improve the quality of the clamped edge plate, and improve the clamping and production stability of the formed edge part.

[0005] In order to achieve the above object, the present invention adopts the following technical means. Disclosed is an edge clamping device for glass substrate forming by the overflow method, which includes a primary clamping unit and a secondary tensioning unit. Both the primary clamping unit and the secondary tensioning unit clamp the edge parts on both sides of the glass plate (3). The primary clamping unit is arranged above the secondary tensioning unit, and the primary clamping unit is arranged closer to the flow guide plate (11) than the secondary tensioning unit.

[0006] The clamping roller (4) of the primary clamping unit is a solid roller, and the material of the clamping roller (4) is a high-temperature resistant metal or a ceramic material.

[0007] The clamping roller (4) is attached below the flow guide plate (11).

[0008] The cooling tensioning roller (2) of the secondary tensioning unit is a hollow roller, and the inside of the cooling tensioning roller (2) is a cavity with a uniform wall thickness.

[0009] A cooling air duct (21) is inserted into the cavity of the cooling tensioning roller (2).

[0010] Cooling air is supplied to the cooling air duct (21).

[0011] The positions of the glass plate (3) are divided in order according to the temperature interval downward from the flow guide plate (11), and the primary clamping unit clamps the edge part of the glass plate (3) at a position where the temperature is 1000 - 1050 °C.

[0012] The glass plate (3) is divided into sections in order according to the temperature interval downward from the flow guide plate (11), and the secondary tension unit clamps the edge portion of the glass plate (3) at a position where the temperature is 900 to 1000 °C.

[0013] A working method of an edge clamping device for forming a glass substrate by the overflow method, in the forming process of the glass plate (3), the clamping roller (4) and the cooling and tensioning roller (2) are clamped on both edge portions of the glass plate (3), the glass at the edge portions is quickly merged and joined, and at the same time, cooling air is supplied to the cooling air duct (21) to quickly cool the edge portions of the joined glass plate (3).

Advantages of the Invention

[0014] The edge clamping device for forming a glass substrate by the overflow method according to the present invention has the following beneficial effects. The present invention discloses an edge clamping device for forming a glass substrate by the overflow method, and adopts a primary clamping and a secondary tension cooling method. That is, the primary clamping promotes the adhesion of the glass edge portion in a high-temperature state, and the secondary tension and cooling quickly cool the edge portion to form a certain clamping thickness, suppressing the shrinkage of the plate width. Thereby, the adhesion quality of the edge plate is improved, the clamping effect is improved, and the stability of the production quality is achieved.

[0015] The present invention forms a better state of the glass edge plate through the combined action of the clamping roller and the tensioning roller, improving the stability of production. Compared with the prior art, it promotes the adhesion of the glass edge portion in a high-temperature state and improves the problem that the clamping position of the clamped edge plate is too low. It eliminates the quality defects of the edge plate such as poor adhesion caused by the temperature drop of the glass plate in the clamping area, a displaced edge with cavities, and a sudden change in thickness between the edge plate and the effective transition area. Thereby, the clamping of the formed edge portion and the stability of production are improved, and the adverse effects such as plate cracking and cracking occurring during cross-cutting in the subsequent process are eliminated.

[0016] Furthermore, the clamp roller is arranged above the cooling tension roller, which can block the influence of the cooling tension roller on the temperature of the flow guide plate and avoid the deterioration phenomenon of crystallization in the flow guide plate area. In addition, the cooling tension roller has a higher glass temperature compared to the clamp height of the prior art, which can well promote the adhesion of the glass and reduce the influence of the shrinkage of the glass plate width on the quality of the thickness clamp.

[0017] To more clearly explain the technical solutions of the embodiments of the present invention, the drawings necessary for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention. Those skilled in the art can obtain other related drawings based on these drawings without creative efforts.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Modes for Carrying Out the Invention

[0019] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, hereinafter, with reference to the drawings of the embodiments of the present invention, the technical solutions will be clearly and completely described. It is obvious that the embodiments described here are part of the present invention and do not cover all embodiments. Usually, the components of the embodiments of the present invention described and illustrated here can be arranged and designed in various different configurations.

[0020] Accordingly, the detailed description of the embodiments of the present invention shown in the following drawings does not limit the scope of the present invention protected by the claims, but merely shows selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments that can be obtained by those of ordinary skill in the art without creative efforts are included in the protection scope of the present invention.

[0021] In the following drawings, for the sake of indicating similar items with similar reference numerals and characters, once an item is defined in one drawing, there is no need to further define or explain that item in subsequent drawings.

[0022] In the description of the embodiments of the present invention, when indicating the orientation or positional relationship such as "upper", "lower", "horizontal", "inner", etc., they are based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually arranged when in use, and are only for the purpose of explaining and simplifying the present invention, and do not imply or suggest that the indicated device or element has a specific orientation, specific structure and operation. Therefore, it should not be construed as a limitation of the present invention. Also, terms such as "first", "second", etc. are only used for the purpose of distinguishing descriptions and do not imply or suggest relative importance.

[0023] Furthermore, when the term "horizontal" is used, it does not require that the part is absolutely horizontal, but means that it may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and it means that its structure does not need to be completely horizontal and may be slightly inclined.

[0024] In the description of the embodiments of the present invention, unless otherwise specifically defined or limited, terms such as "installation", "attachment", "connection", "connection", etc. should be interpreted in a broad sense. For example, it may be a fixed connection, a removable connection or an integral connection. It may be a mechanical connection or an electrical connection. It may be directly connected or indirectly connected through an intermediate medium, and the two elements may communicate with each other internally. A person skilled in the art can understand what these terms specifically mean in the present invention according to the specific situation.

[0025] Hereinafter, the embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

[0026] As shown in FIGS. 1 and 2, the present invention discloses an edge clamping device for glass substrate forming by the overflow method, which adopts a two-stage clamping and tensioning method below the flow guide plate 11, that is, a primary clamping unit and a secondary tensioning unit are adopted, and includes a cooling tension roller 2, a cooling air duct 21, and a clamping roller 4. Both the primary clamping unit and the secondary tensioning unit clamp the both-side edge portions of the glass plate 3. The primary clamping unit is disposed above the secondary tensioning unit, and the primary clamping unit is closer to the flow guide plate 11 than the secondary tensioning unit.

[0027] The clamping roller 4 of the primary clamping unit is a solid roller, and the material of the clamping roller 4 can be selected from high-temperature resistant metals or ceramic materials. The clamping roller 4 is mounted below the flow guide plate 11, and the height from the tip of the brick is H1. The secondary tension unit is below the primary clamping unit, and the height from the tip of the brick is H2. In the secondary tension unit, a pair of cooling and tension rollers 2 are symmetrically arranged to clamp both side edges of the glass plate 3. The cooling and tension roller 2 is a hollow roller, and the inside thereof is a cavity with a uniform wall thickness. The cooling air duct 21 is inserted into the cavity of the cooling and tension roller 2 to rapidly cool the edge portion of the glass plate 3. The height H1 of the primary clamp is a position corresponding to a glass temperature of 1000 - 1050 °C below the tip of the brick, without cooling the edge plate area, and the glass on both sides is joined by clamping with two rollers to ensure the joining quality. The glass temperature corresponding to the height H2 of the secondary clamp is 900 - 1000 °C, and the shrinkage in the width direction of the glass plate is suppressed by rapid cooling to ensure the thickness of the edge plate and the width of the glass plate. The combined action of the secondary clamp and tension forms a better state of the glass edge plate and improves the production stability.

[0028] As shown in FIG. 3, the glass liquid 32 flows uniformly from both sides of the overflow brick 1 and converges at the tip of the brick. In the central region, it joins well to form the glass plate 3, but in the glass plate clamp edge portion region 33, due to the cooling and inward shrinkage of the glass plate 3, the glass edge portion is not sufficiently joined, and the B - B cross-sectional shape shown in FIG. 2 appears. Therefore, at the position of the height H1 from the tip of the brick, that is, when the glass plate temperature is 1000 - 1050 °C, a pair of solid clamping rollers 4 are used to clamp both sides of the glass respectively, so that the glass at the edge portion can be rapidly fused and adhered, and no infiltration phenomenon occurs between the clamping roller 4 and the glass plate 3.

[0029] At the position of height H2 from the tip of the brick, that is, when the glass temperature is 950 - 1000°C, both sides of the glass plate 3 are clamped respectively using a pair of cooling and tension rollers 2, and at the same time, cooling air is supplied to the cooling air duct 21 to rapidly cool the clamped area of the glass plate 3, forming a cross-section A - A of the glass edge plate as shown in Fig. 2, that is, a state without ideal cavities, edge displacement, or sudden thickness changes. Further, since the clamping roller 4 is above the cooling and tension roller 2, the influence of the cooling and tension roller 2 on the temperature of the flow guide plate 11 can be blocked, and the deterioration phenomenon of deposited crystals in the flow guide plate 11 area can be avoided. Also, the cooling and tension roller 2 has a higher glass temperature compared to the clamping height of the prior art, can well promote the bonding of the glass, and can reduce the influence of the shrinkage of the glass plate 3 on the plate width.

[0030] Moreover, the present invention discloses a working method of an edge clamping device for glass substrate forming by the overflow method.

[0031] The glass solution 32 is uniformly flowed down from both sides of the overflow brick 1, merged at the tip of the brick, and well joined in the central region to form the glass plate 3.

[0032] The clamping roller 4 and the cooling and tension roller 2 are clamped to both edge portions of the glass plate 3, and the glass at the edge portions can be quickly fused and adhered to each other (quickly merged and joined). At the same time, cooling air is supplied to the cooling air duct 21, and the edge portion of the joined glass plate 3 can be quickly cooled.

[0033] The above is only a preferred embodiment of the present invention, and it does not limit the present invention for those skilled in the art. The present invention can be variously deformed and changed. All modifications, equivalent substitutions, improvements, etc. made within the scope of the gist and principle of the present invention shall be included in the protection scope of the present invention.

Explanation of Reference Numerals

[0034] 1 Overflow brick 11 Flow guide plate 2 Cooling tension roller 21 Cooling air duct 3 Glass plate 31 Glass edge plate area 32 Glass liquid 33 Glass plate clamp edge part area 4 Clamp roller

Claims

1. comprising a primary clamping unit and a secondary tensioning unit, both the primary clamping unit and the secondary tensioning unit clamp both side edges of the glass plate (3), the primary clamping unit is disposed above the secondary tensioning unit, the primary clamping unit is disposed closer to the flow guide plate (11) than the secondary tensioning unit, an edge clamping device for glass substrate forming by the overflow method.

2. The clamping roller (4) of the primary clamping unit is a solid roller, and the material of the clamping roller (4) is a high-temperature resistant metal or a ceramic material. The edge clamping device for glass substrate forming by the overflow method according to Claim 1.

3. The clamping roller (4) is attached below the flow guide plate (11). The edge clamping device for glass substrate forming by the overflow method according to Claim 2.

4. The cooling and tensioning roller (2) of the secondary tensioning unit is a hollow roller, and the inside of the cooling and tensioning roller (2) is a cavity with a uniform wall thickness. The edge clamping device for glass substrate forming by the overflow method according to Claim 1.

5. A cooling air duct (21) is inserted into the cavity of the cooling and tensioning roller (2). The edge clamping device for glass substrate forming by the overflow method according to Claim 4.

6. Cooling air is supplied to the cooling air duct (21). The edge clamping device for glass substrate forming by the overflow method according to Claim 5.

7. The positions of the glass plate (3) are sequentially divided according to the temperature interval downward from the flow guide plate (11), and the primary clamping unit clamps the edge portion of the glass plate (3) at a position where the temperature is 1000 - 1050 °C. The edge clamping device for glass substrate forming by the overflow method according to Claim 1.

8. The positions of the glass plate (3) are sequentially divided according to the temperature interval downward from the flow guide plate (11), and the secondary tensioning unit clamps the edge portion of the glass plate (3) at a position where the temperature is 900 - 1000 °C. The edge clamping device for glass substrate forming by the overflow method according to Claim 1.

9. A working method of the edge clamping device for glass substrate forming by the overflow method according to any one of Claims 1 to 8, In the forming process of the glass plate (3), the clamp roller (4) and the cooling and tension roller (2) are clamped to both side edge portions of the glass plate (3) to quickly merge and join the glass at the edge portions. At the same time, cooling air is supplied to the cooling air duct (21) to quickly cool the edge portions of the joined glass plate (3).

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