Overflow brick, device and method for stably producing substrate glass

Abstract

The invention discloses an overflow brick, device and method for stably producing substrate glass, and belongs to the technical field of liquid crystal substrate glass manufacturing. According to the overflow brick provided by the invention, a split type arched overflow brick structure is adopted, so that the influence of the gravity of the overflow brick on the production stability is weakened; meanwhile, a supporting and clamping device of an L-shaped structure is introduced, and negative effects caused by creep deformation are counteracted by applying horizontal clamping acting force. The fixed connecting surface of the first brick body and the second brick body is designed to be the arched curved surface, and the clamping acting force provided by the supporting and clamping device is combined, so that the overall structural stability of the overflow brick is enhanced, and the overflow brick can work stably in a high-temperature and long-time working environment; the creep phenomenon possibly occurring in the production process of advanced-generation substrate glass can be inhibited, and deformation is effectively resisted; and the molten glass is ensured to overflow and pull down in a stable and uniform state, so that the thickness uniformity of the overflow glass is improved, and the production quality of the substrate glass is improved.

Description

Technical Field

[0001] The invention relates to the technical field of liquid crystal substrate glass manufacturing, and in particular to an overflow brick, a device and a method for stably producing substrate glass. Background Art

[0002] In the field of liquid crystal substrate glass manufacturing technology such as thin film transistor display (TFT-LCD) and plasma display panel (PDP), the overflow down-draw process is widely used. The core of this process is to supply the molten glass liquid in the glass melting furnace to the molten overflow down-draw molding device to complete the molding process. As a key technology in substrate glass production, the basic principle of the overflow down-draw method is to allow the molten glass liquid to enter the overflow channel from the feeding part and then flow down along the overflow trough. The lower part of the overflow trough is usually designed as a wedge-shaped body, and the glass liquid flows down along the two wedge-shaped surfaces and finally merges at the bottom edge of the wedge to form a glass ribbon. This glass ribbon can be annealed and other subsequent treatments to produce high-quality substrate glass. Compared with the float and slit drawing processes, the overflow down-draw method can create glass plates with excellent surface flatness and smoothness, and eliminates the tedious steps of secondary forming.

[0003] As the core component of the overflow down-draw method, the overflow brick is used to carry and guide the molten glass. The glass liquid flows in the overflow brick and eventually overflows from both sides of the brick to form a continuous glass ribbon. The shape and dimensional accuracy of the overflow brick have an important influence on the thickness uniformity of the glass ribbon. If the overflow brick is deformed or worn, it will cause uneven flow of the glass liquid, thus affecting the thickness uniformity of the glass ribbon. However, in the high temperature environment of up to 1300°C in the muffle furnace, long-term high-temperature operation will cause the overflow brick to deform, and the shape and dimensional accuracy of the overflow brick will be destroyed. This is mainly because the overflow brick is traditionally supported and fixed at both ends. The middle part is easy to sink during the deformation process, resulting in a depression in the middle of the groove, which increases the overflow of the glass liquid in the middle part, increases the thickness of the glass substrate in the middle, and then causes defects such as warping and stress, and reduces the yield rate. At the same time, with the development of high-generation, the quality requirements for substrate glass are becoming increasingly stringent. Although the overflow method has become the mainstream process in the industry due to its excellent surface quality and convenience without secondary processing, the continuous expansion of glass size has caused the overflow bricks, which are the core components, to continue to expand, exacerbating the creep problem of overflow bricks in high temperature environments. High-temperature creep not only directly interferes with the flow distribution of glass liquid and affects the uniformity of glass thickness, but in severe cases may also significantly reduce the service life of the entire overflow equipment.

[0004] Therefore, how to effectively solve the creep problem of overflow bricks in high temperature environments has become a technical problem that technical personnel in this field need to solve urgently. Summary of the invention

[0005] The object of the present invention is to provide an overflow brick, device and method for stably producing substrate glass, so as to overcome the deformation problem of the overflow brick caused by long-term operation in a high temperature environment in the prior art.

[0006] The present invention solves the above technical problems through the following technical solutions: An overflow brick for stably producing substrate glass, comprising an overflow brick body and a supporting clamping device; The overflow brick body includes a first brick body and a second brick body from top to bottom, the first brick body is provided with a concave overflow groove with an inclined upper end surface for containing glass liquid; the first brick body is fixedly connected to the second brick body, the second brick body is a V-shaped structure for overflowing and pulling down the glass liquid, and the fixed connection surface between the first brick body and the second brick body is an arched curved surface; The supporting clamping device is an L-shaped structure. The horizontal section of the supporting clamping device is provided with a recessed groove adapted to the V-shaped structure and is symmetrically arranged at both ends of the second brick body. The vertical section of the supporting clamping device is clamped at both ends of the overflow brick body. The end face of the vertical section is higher than the highest horizontal cross-section of the arched surface and lower than the inner groove bottom surface of the concave overflow groove.

[0007] Furthermore, the arch height H1 of the arched surface is specifically: Arch height H1 of arched surface> , in, , W is the fulcrum span of the overflow brick, and t is the time.

[0008] Furthermore, the creep rate of the overflow brick At 1300℃, less than 10×10 -5 mm / hr.

[0009] Furthermore, a distance H2 from the arched curved surface to the inner groove bottom surface (11) of the concave overflow groove is at least 30 mm.

[0010] Furthermore, the overflow brick body is made of refractory material.

[0011] Furthermore, a positioning pin is vertically arranged above the horizontal section of the supporting clamping device, and the positioning pin is used to fix the first brick body and the second brick body.

[0012] Furthermore, the positioning pin is made of the same refractory material as the overflow body.

[0013] Furthermore, a horizontal through hole is provided in the horizontal section of the supporting clamping device, and a displacement sensor is provided inside the horizontal through hole for monitoring the fulcrum span W of the overflow brick.

[0014] The present invention also provides an overflow device for stably producing substrate glass, comprising an overflow brick, and the overflow brick is the above-mentioned overflow brick for stably producing substrate glass.

[0015] The present invention also provides a method for stably producing substrate glass, using the above-mentioned overflow brick for stably producing substrate glass, applying a force F to the overflow brick body, and controlling the creep of the overflow brick by adjusting the force F applied to the overflow brick body.

[0016] Compared with the prior art, the positive and progressive effects of the present invention are: The overflow brick for stable production of substrate glass provided by the present invention adopts a split arch overflow brick structure, and the overflow brick body is designed to be connected with the first brick body and the second brick body, thereby reducing the influence of the overflow brick's own gravity on production stability; at the same time, an L-shaped support clamping device is introduced to offset the negative impact of creep by applying a horizontal clamping force. By designing the fixed connection surface of the first brick body and the second brick body as an arched curved surface, combined with the clamping force provided by the support clamping device, not only the overall structural stability of the overflow brick is enhanced, but also the overflow brick can suppress the creep phenomenon that may occur in the production process of high-generation substrate glass under high temperature and long-term working environment, and effectively resist deformation; ensure that the glass liquid overflows and pulls down in a stable and uniform state, thereby improving the uniformity of the overflow glass thickness and the production quality of the substrate glass.

[0017] Furthermore, the arch height H1 of the arched surface is accurately calculated based on the creep rate, support span and time of the overflow brick, ensuring that the influence of creep on the performance of the overflow brick is minimized during long-term use.

[0018] Furthermore, the overflow brick body is made of refractory material to ensure sufficient strength and stability in high temperature environments. In addition, the positioning pins are also made of the same refractory material as the overflow body, ensuring that the upper and lower connections of the overflow brick body are reliable, without dislocation, and the joint surface is smooth and without gaps, thereby enhancing the high temperature resistance of the overall structure.

[0019] Furthermore, the horizontal section of the supporting clamping device is provided with a displacement sensor, which can monitor the fulcrum span W of the overflow brick in real time, and provide data support for timely adjustment of the force F and creep control, making the monitoring and adjustment in the production process more convenient and accurate.

[0020] Furthermore, by adjusting the force F applied to the overflow brick body, the creep can be precisely controlled to improve production stability and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification are used to provide further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0022] Figure 1It is a structural schematic diagram of overflow bricks in the prior art; Figure 2 for Figure 1 sectional view of Figure 3 It is a simplified force analysis diagram of an overflow brick in the prior art without creep; Figure 4 It is a simplified schematic diagram of the force analysis of the creep of overflow bricks in the prior art; Figure 5 It is a schematic diagram of the structure of the overflow brick of the present invention; Figure 6 for Figure 5 sectional view of Figure 7 It is a simplified schematic diagram of the stress analysis of the overflow brick of the present invention.

[0023] Among them, 11 is the bottom surface of the inner groove; 12 is the overflow brick cofferdam; 13 is the original supporting clamping device; 111 is the bottom surface of the inner groove after creep; 121 is the overflow brick cofferdam after creep; G is gravity; g1 and g2 are the components of gravity G; F is the action force; f1 and f2 are the components of the action force F; 21 is the first brick body; 22 is the second brick body; 23 is the supporting clamping device; 24 is the positioning pin; 25 is the displacement sensor; 211 is the arched surface. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0028] In addition, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments, which are intended to explain the present invention rather than to limit it.

[0030] See also Figure 1 and Figure 2 The overflow brick body is placed vertically on the original support clamping device 13 at both ends, see Figure 3 , a force F is applied in the horizontal direction to clamp the overflow brick body, and a force G is applied in the vertical direction to the overflow brick body's own gravity and the glass liquid's gravity.

[0031] Creep ,in, , W is the span of the overflow brick support, and t is the time. Figure 4 As time goes by, the creep amount will become larger and larger, and the overflow brick cofferdam 12 and the bottom surface of the inner groove 11 will gradually bend and deform to Figure 1 The overflow brick cofferdam 121 after creep and the inner tank bottom surface 111 after creep are located in the middle; at this time, the glass liquid along the cofferdam will no longer overflow evenly, and the trend of the glass plate being thick in the middle and thin on both sides is becoming more and more obvious. Under the action of gravity G, Figure 4As shown in the figure, the downward bending deformation, as the deformation m continues to increase, the traditional technology will increase the clamping force F to print the increase of creep, but once creep occurs, increasing the force F at this time will further aggravate the creep. Generally, for overflow bricks with a length of 2 m to 2.5 m (corresponding to G6-G7.5 products), the creep amount will exceed 15 mm after 2 to 3 years of production, and the thickness uniformity will not meet the requirements, resulting in the replacement of the entire overflow device, which will have a serious impact on production or the benefits of the enterprise. The high-generation (G8.5 and above) overflow bricks are longer in length and have a larger span W of 3 m to 3.5 m. According to the creep rate of the same material, the creep amount of the overflow device of this structure will exceed 20 mm after 2 years, which will have a serious impact on production.

[0032] See also Figure 5 and Figure 6 In the present invention, the first brick body 21 and the second brick body 22 of the overflow brick are processed separately to ensure the same matching arched surface 211, wherein the arched height H1 of the arched surface is greater than the creep amount ∆ (in mm), and the distance H2 from the arched surface to the bottom surface of the inner groove of the concave overflow groove is greater than 30 mm (minimum strength thickness). Pin holes are provided at the same position at the junction of the upper and lower parts of the overflow brick, which are connected by positioning pins 24. After further combined processing, all the butt joint surfaces 211 are ensured to be smooth and flat.

[0033] See also Figure 7 According to the characteristics of the overflow brick arch structure, the span of the arch surface is W. The gravity G at the two end supports generates components g1 and g2 along the arch direction. At the same time, it is also affected by the clamping force F. The force F is analyzed to generate components f1 and f2. Among them, the component f1 along the tangent direction of the arch is opposite to the direction of the gravity components g1 and g2, which can suppress the increase of the curvature H1 of the arch.

[0034] Therefore, the present invention provides an overflow brick for stably producing substrate glass, comprising an overflow brick body and a supporting clamping device 23; The overflow brick body includes a first brick body 21 and a second brick body 22 from top to bottom. The first brick body 21 is provided with a concave overflow groove with an inclined upper end surface for containing glass liquid. The first brick body 21 is fixedly connected to the second brick body 22. The second brick body 22 is a V-shaped structure for overflowing and pulling down the glass liquid. The fixed connection surface of the first brick body 21 and the second brick body 22 is an arched curved surface 211. The supporting clamping device 23 is an L-shaped structure. The horizontal section of the supporting clamping device 23 is provided with a recessed groove adapted to the V-shaped structure, which is symmetrically arranged at both ends of the second brick body 22. The vertical section of the supporting clamping device 23 is clamped at both ends of the overflow brick body. The end face of the vertical section is higher than the highest horizontal cross-section of the arched surface 211 and lower than the inner groove bottom surface of the concave overflow groove, which is used to apply a force F to the overflow brick body.

[0035] The overflow brick for stable production of substrate glass provided by the present invention adopts a split arch overflow brick structure, and the overflow brick body is designed to be connected with the first brick body and the second brick body, thereby reducing the influence of the overflow brick's own gravity on production stability; at the same time, an L-shaped support clamping device is introduced to offset the negative impact of creep by applying a horizontal clamping force. By designing the fixed connection surface of the first brick body and the second brick body as an arched curved surface, combined with the clamping force provided by the support clamping device, not only the overall structural stability of the overflow brick is enhanced, but also the overflow brick can suppress the creep phenomenon that may occur in the production process of high-generation substrate glass under high temperature and long-term working environment, and effectively resist deformation; ensure that the glass liquid overflows and pulls down in a stable and uniform state, thereby improving the uniformity of the overflow glass thickness and the production quality of the substrate glass.

[0036] Specifically, the arch height H1 of the arch surface 211 is: The arch height H1 of the arch surface 211> , in, , W is the fulcrum span of the overflow brick, and t is the time.

[0037] Specifically, the creep rate of overflow bricks At 1300℃, less than 10×10 -5 mm / hr.

[0038] The arch height H1 of the arched surface is accurately calculated according to the creep rate, support span and time of the overflow brick, ensuring that the influence of creep on the performance of the overflow brick is minimized during long-term use.

[0039] Specifically, the distance H2 from the arched surface 211 to the inner groove bottom surface 11 of the concave overflow groove is at least 30 mm.

[0040] Specifically, the overflow brick body is made of refractory material.

[0041] Specifically, a positioning pin 24 is vertically arranged above the horizontal section of the supporting clamping device 23 , and the positioning pin 24 is used to fix the first brick body 21 and the second brick body 22 .

[0042] Specifically, the positioning pin 24 is made of the same refractory material as the overflow body.

[0043] The overflow brick body is made of refractory material to ensure sufficient strength and stability in high temperature environments. In addition, the positioning pins are also made of the same refractory material as the overflow body, ensuring that the upper and lower connections of the overflow brick body are reliable, without dislocation, and the joint surface is smooth and without gaps, thereby enhancing the high temperature resistance of the overall structure.

[0044] Specifically, a horizontal through hole is provided in the horizontal section of the supporting clamping device 23, and a displacement sensor 25 is provided inside the horizontal through hole for monitoring the fulcrum span W of the overflow brick.

[0045] The horizontal section of the supporting clamping device is provided with a displacement sensor, which can monitor the fulcrum span W of the overflow brick in real time, and provide data support for timely adjustment of the force F and creep control, making the monitoring and adjustment in the production process more convenient and accurate.

[0046] Based on the same inventive concept, the present invention provides an overflow device for stably producing substrate glass, comprising an overflow brick, wherein the overflow brick is the above-mentioned overflow brick for stably producing substrate glass.

[0047] Based on the same inventive concept, the present invention provides a method for stably producing substrate glass, using the above-mentioned overflow brick for stably producing substrate glass, applying a force F to the overflow brick body, and controlling the creep of the overflow brick by adjusting the force F applied to the overflow brick body.

[0048] As a specific embodiment of the present invention, see Figure 5 The overflow brick body is divided into two parts: the first brick body 21 at the upper part and the second brick body 22 at the lower part. The first brick body 21 is provided with a concave overflow groove with an inclined upper end surface for accommodating glass liquid. The second brick body 22 is a V-shaped structure for overflowing and pulling down glass liquid. The fixed connection surface of the first brick body 21 and the second brick body 22 is an arched curved surface 211. The upper and lower parts are connected as a whole through a positioning pin 24. A supporting clamping device 23 is provided at both ends, and a horizontal clamping force F is applied to the overflow brick body to ensure that the clamping mechanism and the overflow brick are in close contact without gaps.

[0049] The supporting clamping device 23 is an L-shaped structure. The second brick body 22 is placed as a whole on the horizontal section of the supporting clamping device 23, and the vertical section covers the joint surface between the second brick body 22 and the supporting clamping device 23, that is, the end face of the vertical section is higher than the highest horizontal cross-section of the arched surface 211. At the same time, the end face of the vertical section is lower than the bottom surface of the inner groove of the concave overflow groove, and the clamping force F is horizontally applied to the outer side of the L-shaped supporting structure.

[0050] At the same time, the horizontal section of the support clamping device 23 is provided with a horizontal through hole, and a displacement sensor 25 is provided inside the horizontal through hole to monitor the fulcrum span W of the overflow brick and immediately reflect the change of the creep amount of the overflow brick. By adjusting the size of F, the occurrence of overflow brick creep is controlled. During the high-temperature production process, the displacement sensor 25 is monitored in real time. When creep occurs, the span W changes and is dynamically reflected to the displacement sensor. At this time, by increasing the clamping force F, it is ensured that W is maintained in a very small fluctuation range (generally ±0.5mm). In this state, it is ensured that the creep of the overflow brick will not fluctuate greatly, so that the overflow brick can suppress the creep phenomenon that may occur in the production process of high-generation substrate glass under high temperature and long-term working environment, and effectively resist deformation; ensure that the glass liquid overflows and pulls down in a stable and uniform state, thereby improving the uniformity of the overflow glass thickness and the production quality of the substrate glass.

[0051] Finally, it should be noted that the above-listed embodiments exist only as one or more specific forms of expression of the technical solution of the present invention. Their purpose is to clearly explain the concept, principle and application of the present invention through specific examples, and it is by no means intended to limit the protection scope of the present invention to these specific embodiments. In fact, the real value of the present invention lies in the technical ideas and innovations it proposes, rather than its form of expression or means of implementation.

[0052] For ordinary technicians in the relevant technical field, after in-depth reading and understanding of the technical solution of the present invention, they are fully capable of making various forms of changes, modifications or equivalent substitutions to the specific implementation methods of the invention based on their own professional knowledge and skills. These changes may include but are not limited to: adjusting the value range of technical parameters, optimizing algorithm processes to improve efficiency, replacing some technical components to achieve better compatibility or reduce costs, etc. As long as these changed technical solutions still substantially maintain the technical features claimed for protection by the original invention, that is, they can still achieve the core functions and effects of the present invention, then these changes should be deemed to fall within the scope of protection of the pending claims of the present invention.

[0053] In addition, with the continuous progress and development of technology, new technical means and methods continue to emerge, which also provides broad space for further improvement and perfection of the present invention. Therefore, the protection scope of the present invention should also include those reasonably foreseeable improvements and extensions based on the existing technology. As long as these improvements and extensions do not deviate from the basic principles and core concepts of the present invention, they should be regarded as equivalents of the present invention and are also protected by patent rights.

Claims

1. An overflow brick for stable production of substrate glass, characterized in that: It includes an overflow brick body and a supporting clamping device (23); The overflow brick body comprises, from top to bottom, a first brick body (21) and a second brick body (22), the first brick body (21) being provided with a concave overflow groove having an inclined upper end surface for containing glass liquid; the first brick body (21) being fixedly connected to the second brick body (22), the second brick body (22) being a V-shaped structure for overflowing and pulling down glass liquid, and the fixed connection surface between the first brick body (21) and the second brick body (22) being an arched curved surface (211); The support clamping device (23) is an L-shaped structure. The horizontal section of the support clamping device (23) is provided with a concave groove adapted to the V-shaped structure and is symmetrically arranged at both ends of the second brick body (22). The vertical section of the support clamping device (23) is clamped and arranged at both ends of the overflow brick body. The end surface of the vertical section is higher than the highest horizontal cross section of the arched curved surface (211) and lower than the inner groove bottom surface of the concave overflow groove.

2. The overflow brick for stable production of substrate glass according to claim 1, characterized in that: The arch height H1 of the arched surface (211) is specifically: The arch height H1 of the arched surface (211)> , in, , W is the fulcrum span of the overflow brick, and t is the time.

3. The overflow brick for stable production of substrate glass according to claim 2, characterized in that: Creep rate of overflow brick At 1300℃, less than 10×10 -5 mm / hr.

4. The overflow brick for stable production of substrate glass according to claim 2, characterized in that: The distance H2 from the arched curved surface (211) to the inner groove bottom surface (11) of the concave overflow groove is at least 30 mm.

5. The overflow brick for stable production of substrate glass according to claim 1, characterized in that: The overflow brick body is made of refractory material.

6. The overflow brick for stable production of substrate glass according to claim 1, characterized in that: A positioning pin (24) is vertically arranged above the horizontal section of the supporting clamping device (23), and the positioning pin (24) is used to fix the first brick body (21) and the second brick body (22).

7. The overflow brick for stable production of substrate glass according to claim 6, characterized in that: The positioning pin (24) is made of the same refractory material as the overflow body.

8. The overflow brick for stable production of substrate glass according to claim 1, characterized in that: The horizontal section of the supporting clamping device (23) is provided with a horizontal through hole, and a displacement sensor (25) is provided inside the horizontal through hole for monitoring the fulcrum span W of the overflow brick.

9. An overflow device for stably producing substrate glass, characterized in that: It comprises an overflow brick, and the overflow brick is the overflow brick for stably producing substrate glass as described in any one of claims 1 to 8.

10. A method for stably producing substrate glass, characterized in that: By using the overflow brick for stable production of substrate glass as described in any one of claims 1 to 8, a force F is applied to the overflow brick body, and the creep of the overflow brick is controlled by adjusting the force F applied to the overflow brick body.

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