Substrate glass extraction amount control, glass liquid homogenization supply device and method

Abstract

The present invention discloses a substrate glass extraction amount control and glass liquid homogenization supply device and method. The device includes a supply device and an auxiliary heating device. The supply device is composed of a supply inner pipe and a supply outer pipe, and the supply inner pipe is arranged inside the supply outer pipe. The supply outer pipe is composed of a supply upper outer pipe, a supply middle outer pipe, a supply lower outer pipe, and a variable-diameter circular pipe. The supply upper outer pipe is attached to the upper end of the supply middle outer pipe, and the supply lower outer pipe is attached to the lower end. The supply upper outer pipe, the supply middle outer pipe, and the supply lower outer pipe are connected by the variable-diameter circular pipe. Further, the auxiliary heating device is composed of an inner heater and an outer heater. In the present invention, by differentially adjusting the currents of the inner heater and the outer heater, the inside and outside of the glass liquid are heated simultaneously, and by controlling the temperature of the glass liquid to rise or fall simultaneously inside and outside, the temperature uniformity of the glass liquid after heating or cooling is ensured, the adjustment reaction time of the extraction amount is shortened, and precise control of the extraction amount is realized.

Description

Technical Field

[0001] The present invention belongs to the field of manufacturing substrate glass, and specifically relates to a device and method for controlling the extraction amount of substrate glass and homogenously supplying glass liquid.

Background Art

[0002] Substrate glass is one of the important raw materials constituting a liquid crystal panel and has a very great influence on the performance of panel products. Indicators such as the resolution, transmittance, thickness, weight, and viewing angle of panel products are closely related to the quality of the substrate glass used.

[0003] In the manufacturing process of substrate glass, the prepared raw materials are melted at a high temperature in a melting furnace to form a glass liquid, and through processes such as heating and fining and cooling and stirring in a platinum passage, the temperature of the high-temperature glass liquid is made to conform to the conditions of forming supply. The supply device is one of the important facilities in the manufacturing process of substrate glass, and its main function is to stably and uniformly supply the glass liquid to the forming section to achieve high-quality overflow down-draw forming.

Summary of the Invention

Problems to be Solved by the Invention

[0004] Since fluctuations in the supply temperature of the glass liquid and stable control of the extraction amount (drawing amount) are required, the supply device needs to continuously heat the glass liquid to ensure the desired supply temperature and a stable extraction amount. However, in the current supply device, heating by a single-sided heater causes non-uniformity in the internal and external temperatures of the supplied glass liquid and extends the temperature response time of the glass liquid. As a result, rapid response and precise control for adjusting the extraction amount cannot be achieved, which affects the quality of the overflow down-draw forming, and defects such as non-uniformity in the thickness, stress, and warpage of the substrate glass occur, leading to a situation where the requirements are not met.

[0005] The object of the present invention is to solve the problems of defects in the substrate glass caused by the non-uniformity of the internal and external temperatures of the supplied glass liquid, and the difficulty in quickly responding to and precisely controlling the adjustment of the extraction amount.

Means for Solving the Problems

[0006] The present invention discloses an apparatus and a method for precisely controlling the extraction amount of substrate glass and homogenizing and supplying the glass liquid, eliminating the defects of the substrate glass caused by the non-uniformity of the internal and external temperatures of the supplied glass liquid, and enabling a quick response and precise control for the adjustment of the extraction amount.

[0007] In order to achieve the above object, the present invention adopts the following technical means. The present invention includes a supply device (1) and an auxiliary heating device (2). The supply device (1) includes a supply inner pipe (3) and a supply outer pipe (4). The supply inner pipe (3) is arranged inside the supply outer pipe (4). The supply outer pipe (4) includes a supply upper outer pipe (4-1), a supply middle outer pipe (4-2), a supply lower outer pipe (4-3), and a variable-diameter circular pipe. The supply upper outer pipe (4-1) is provided at the upper end of the supply middle outer pipe (4-2), and the supply lower outer pipe (4-3) is provided at the lower end of the supply middle outer pipe (4-2). The supply upper outer pipe (4-1), the supply middle outer pipe (4-2), and the supply lower outer pipe (4-3) are connected by the variable-diameter circular pipe. The auxiliary heating device (2) includes an inner heater (6) and an outer heater (8). The inner heater (6) is arranged inside the supply inner pipe (3) and installed in conjunction with the supply inner pipe (3). The outer heater (8) surrounds the supply outer pipe (4) and is installed in conjunction with the supply outer pipe (4). A substrate glass extraction amount control and glass liquid homogenizing supply device is disclosed, which is characterized in the above.

[0008] Furthermore, the supply upper outer pipe (4-1), the supply middle outer pipe (4-2), and the supply lower outer pipe are circular straight pipes, their shapes are hollow cylinders, and the shape of the variable-diameter circular pipe is a hollow frustum of a cone.

[0009] Furthermore, the diameter of the circular cross-section of the middle supply outer tube (4-2) is larger than the diameter of the circular cross-section of the lower supply outer tube (4-3), the diameter of the circular cross-section of the lower supply outer tube (4-3) is larger than the diameter of the circular cross-section of the upper supply outer tube (4-1), and the length of the middle supply outer tube (4-2) is larger than the length of the lower supply outer tube (4-3), and the length of the lower supply outer tube (4-3) is larger than the length of the upper supply outer tube (4-1).

[0010] Furthermore, the supply inner tube (3) uses a circular straight tube and a conical tube, and the conical tube is attached to the end of the circular straight tube of the supply inner tube (3).

[0011] Furthermore, the supply inner tube (3) and the supply outer tube (4) are made of a platinum-rhodium alloy material, the outside of the outer heater (8) is wrapped with a heat-insulating material (10), and the heat-insulating material (10), the inner heater (6), and the outer heater (8) are made of an aluminum oxide material.

[0012] Furthermore, the inner heater (6) has a cylindrical shape, a pure platinum wire is embedded inside the inner heater (6) and the outer heater (8), and the diameter of the pure platinum wire is 2.5 mm to 3.0 mm.

[0013] Furthermore, an inner filling gap (7) is formed between the inner heater (6) and the supply inner tube (3), an outer filling gap (9) is formed between the outer heater (8) and the supply outer tube (4), a supply space (5) is formed between the supply inner tube (3) and the supply outer tube (4), and the widths of the inner filling gap (7) and the outer filling gap (9) are 10 to 20 mm.

[0014] Furthermore, aluminum oxide powder is used as the material to fill the inner filling gap (7) and the outer filling gap (9).

[0015] Furthermore, the length of the supply inner tube (3) is set to be shorter than the length of the supply outer tube (4) so that the glass liquid in the supply space (5) is surely integrated at the outlet of the supply device.

[0016] Furthermore, there is provided a method for controlling the extraction amount of substrate glass and homogenizing the supply of glass liquid. Based on the device, when a command for decreasing or increasing the extraction amount is given in the forming process, the currents of the inner heater (6) and the outer heater (8) are adjusted simultaneously, and the temperature is controlled by the current, so as to precisely control the extraction amount of the glass liquid and ensure the uniformity of the temperature of the glass liquid after the extraction amount adjustment. When the extraction amount of the glass liquid decreases in the forming process, the currents of the inner heater (6) and the outer heater (8) are decreased simultaneously, and the temperature of the glass liquid is controlled to decrease uniformly due to the reduction of the current. When the extraction amount of the glass liquid increases in the forming process, the currents of the inner heater (6) and the outer heater (8) are increased simultaneously, and the temperature of the glass liquid is controlled to increase uniformly due to the increase of the current. Disclosed is a method for controlling the extraction amount of substrate glass and homogenizing the supply of glass liquid.

Advantages of the Invention

[0017] The device for controlling the extraction amount of substrate glass and homogenizing the supply of glass liquid according to the present invention has the following beneficial effects. The present invention provides a device for controlling the extraction amount of substrate glass and homogenizing the supply of glass liquid. Specifically, a supply device and an auxiliary heating device are provided. The supply device is composed of a supply inner pipe and a supply outer pipe, and the supply inner pipe is arranged inside the supply outer pipe. The auxiliary heating device is composed of an inner heater and an outer heater. The inner heater is arranged inside the supply inner pipe, and the outer heater is arranged outside the supply outer pipe. With this structure, the temperature uniformity of the glass liquid for forming can be ensured, and defects of the substrate glass caused by non-uniform temperature can be avoided. In addition, due to the arrangement of the inner and outer heaters, rapid response and precise control for the adjustment of the extraction amount can be realized, and the production efficiency can be effectively improved.

[0018] The present invention provides a method for controlling the extraction amount of substrate glass and homogenizing and supplying the glass liquid. By differentially adjusting the currents of the inner heater and the outer heater to heat the glass liquid in the supply device, the defect problem of the substrate glass caused by the temperature non-uniformity of the glass liquid for forming is solved. Furthermore, by simultaneously raising and lowering the temperatures inside and outside the glass liquid, the adjustment reaction time of the extraction amount is shortened, and rapid response and precise control are realized. Thereby, the production efficiency can be effectively improved.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

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Figure 4

Embodiments for Carrying Out the Invention

[0020] For those skilled in the art to better understand the present invention, based on the accompanying drawings, the technical means and embodiments of the present invention will be described in more detail. The following content is an explanation of the present invention and does not limit the present invention.

[0021] In this specification and the claims, the terms "comprising", "having" and their variants are intended to mean non-exclusive inclusion. For example, a process, method, system, product or apparatus including a series of steps or elements is not limited to these steps or elements explicitly listed, but may include other steps or elements, or other steps or elements inherent to these processes, methods, systems, products or apparatuses.

[0022] The device for precisely controlling the extraction amount of the substrate glass and homogenizing and supplying the glass liquid includes a platinum supply device 1 and an auxiliary heating device 2. The platinum supply device 1 includes a supply inner tube 3, a supply outer tube 4, and a supply space 5 formed between the supply inner tube 3 and the supply outer tube 4. The auxiliary heating device 2 includes an inner heater 6, an outer heater 8, an inner filling gap 7 formed between the inner heater 6 and the inner wall of the supply inner tube 3, and an outer filling gap 9 formed between the outer heater 8 and the outer wall of the supply outer tube 4. The outer periphery of the outer heater 8 is covered with a heat insulating material 10. The glass liquid in the supply space 5 is concentrated into one at the outlet of this supply device.

[0023] The supply inner tube 3 is a circular straight tube with a diameter of 130 - 150 mm. The supply outer tube 4 is a circular straight tube with unequal diameters. The diameter of the upper supply outer tube 4-1 is 150 - 170 mm and the height is 300 - 400 mm. The diameter of the middle supply outer tube 4-2 is 300 - 340 mm and the height is 300 - 350 mm. The diameter of the lower supply outer tube 4-3 is 190 - 230 mm and the height is 900 - 1000 mm. The upper supply outer tube 4-1, the middle supply outer tube 4-2, and the lower supply outer tube 4-3 are connected by a circular tube with a variable diameter (for example, a reduced-diameter circular tube). The wall thickness between the supply inner tube 3 and the supply outer tube 4 is 0.8 mm - 1.2 mm, and all the materials are platinum-rhodium alloys with a mass ratio of rhodium of 5% or more.

[0024] The auxiliary heating device 2 is divided into 5 - 10 groups from top to bottom, and each group includes an inner heater 6 and an outer heater 8. The outer heater 8 has the same shape as the supply outer tube 4 and is fittedly attached. The inner heater 6 is cylindrical.

[0025] The inner heater 6, the outer heater 8, and the heat insulating material 10 are made of aluminum oxide material, the thermal conductivity of which is 3 kcal / (m·h·°C) or less, and the thickness of the heat insulating material 10 is 50 - 150 mm.

[0026] Inside the inner heater 6 and the outer heater 8, a pure platinum wire is embedded, and heat is generated by the self-heating of platinum when energized. The diameter of this pure platinum wire is 2.5 - 3.0 mm. The widths of the inner filling gap 7 and the outer filling gap 9 are 10 - 20 mm. The filling materials for the inner filling gap 7 and the outer filling gap 9 are aluminum oxide powder, and they are filled by injecting a slurry prepared by mixing the aluminum oxide powder and pure water at 60 - 90°C in a ratio of 2 - 5:1.

[0027] Disclosed is a method for precisely controlling the extraction amount of substrate glass and homogenizing and supplying the glass liquid. The method introduces the glass liquid from the supply inlet into the supply device. When there is an instruction to decrease or increase the extraction amount during forming, the supply device controls the extraction amount by raising or lowering the temperature of the glass liquid. Specifically, by adjusting the currents of the inner heater 6 and the outer heater 8, the temperatures inside and outside the glass liquid can be simultaneously raised or lowered, shortening the adjustment reaction time of the extraction amount and enabling precise control of the extraction amount.

[0028] Also, when the glass liquid enters the supply device from the supply inlet and the temperature of the glass liquid is lower or higher than the supply temperature required for forming, it is necessary to raise or lower the temperature of the glass liquid. At this time, by differentially adjusting the currents of the inner heater 6 and the outer heater 8, the inside and outside of the glass liquid can be simultaneously heated to ensure the uniformity of the temperature of the glass liquid after heating or cooling.

[0029] It can be understood from common technical knowledge that the present invention can be implemented by other embodiments without departing from its gist or essential features. Therefore, the above-described embodiments according to the present invention are merely examples and do not limit the present invention, and the present invention can be variously modified and changed. All modifications, equivalent substitutions, improvements, etc. made within the scope of the gist and principle of the present invention are included in the protection scope of the present invention.

Explanation of Reference Numerals

[0030] 1 Supply device 2 Auxiliary heating device 3 Supply inner pipe 4 Supply Outer Tube 4-1 Supply Upper Outer Tube 4-2 Supply Middle Outer Tube 4-3 Supply Lower Outer Tube 5 Supply Space 6 Inner Heater 7 Inner Filling Gap 8 Outer Heater 9 Outer Filling Gap 10 Heat Insulating Material

Claims

1. comprising a supply device (1) and an auxiliary heating device (2), wherein the supply device (1) includes a supply inner pipe (3) and a supply outer pipe (4), the supply inner pipe (3) is disposed inside the supply outer pipe (4), the supply outer pipe (4) includes a supply upper outer pipe (4-1), a supply middle outer pipe (4-2), a supply lower outer pipe (4-3) and a reduced-diameter circular pipe, the supply upper outer pipe (4-1) is provided at the upper end of the supply middle outer pipe (4-2), and the supply lower outer pipe (4-3) is provided at the lower end of the supply middle outer pipe (4-2), the supply upper outer pipe (4-1), the supply middle outer pipe (4-2) and the supply lower outer pipe (4-3) are connected by the reduced-diameter circular pipe, the auxiliary heating device (2) includes an inner heater (6) and an outer heater (8), the inner heater (6) is disposed inside the supply inner pipe (3) and installed in conjunction with the supply inner pipe (3), and the outer heater (8) surrounds the supply outer pipe (4) and is installed in conjunction with the supply outer pipe (4), a substrate glass extraction amount control and glass liquid homogenization supply device.

2. The supply upper outer pipe (4-1), the supply middle outer pipe (4-2), and the supply lower outer pipe are circular straight pipes, their shapes are hollow cylinders, and the shape of the reduced-diameter circular pipe is a hollow frustum, the substrate glass extraction amount control and glass liquid homogenization supply device according to Claim 1.

3. The diameter of the circular cross-section of the supply middle outer pipe (4-2) is larger than the diameter of the circular cross-section of the supply lower outer pipe (4-3), the diameter of the circular cross-section of the supply lower outer pipe (4-3) is larger than the diameter of the circular cross-section of the supply upper outer pipe (4-1), and the length of the supply middle outer pipe (4-2) is larger than the length of the supply lower outer pipe (4-3), the length of the supply lower outer pipe (4-3) is larger than the length of the supply upper outer pipe (4-1), the substrate glass extraction amount control and glass liquid homogenization supply device according to Claim 2.

4. The supply inner pipe (3) uses a circular straight pipe and a conical pipe, and the conical pipe is attached to the end of the circular straight pipe of the supply inner pipe (3), the substrate glass extraction amount control and glass liquid homogenization supply device according to Claim 1.

5. The supply inner pipe (3) and the supply outer pipe (4) are made of a platinum-rhodium alloy material, and the outside of the outer heater (8) is wrapped with a heat-insulating material (10). The substrate glass extraction amount control and glass liquid homogenization supply device according to claim 1, wherein the heat insulating material (10), the inner heater (6), and the outer heater (8) are made of aluminum oxide material.

6. The inner heater (6) has a cylindrical shape, and a pure platinum wire is embedded inside the inner heater (6) and the outer heater (8), and the diameter of the pure platinum wire is 2.5 mm to 3.0 mm. The substrate glass extraction amount control and glass liquid homogenization supply device according to claim 1.

7. An inner filling gap (7) is formed between the inner heater (6) and the supply inner pipe (3), an outer filling gap (9) is formed between the outer heater (8) and the supply outer pipe (4), and a supply space (5) is formed between the supply inner pipe (3) and the supply outer pipe (4). The substrate glass extraction amount control and glass liquid homogenization supply device according to claim 1, wherein the widths of the inner filling gap (7) and the outer filling gap (9) are 10 to 20 mm.

8. The substrate glass extraction amount control and glass liquid homogenization supply device according to claim 7, wherein aluminum oxide powder is used as the material filled in the inner filling gap (7) and the outer filling gap (9).

9. The substrate glass extraction amount control and glass liquid homogenization supply device according to claim 7, wherein the length of the supply inner pipe (3) is set shorter than the length of the supply outer pipe (4) so that the glass liquid in the supply space (5) is surely integrated at the outlet of the supply device.

10. A method for controlling the substrate glass extraction amount and homogenizing the glass liquid supply. Based on the device according to any one of claims 1 to 9, when there is an instruction to decrease or increase the extraction amount in the forming process, the currents of the inner heater (6) and the outer heater (8) are adjusted simultaneously, and the temperature is controlled by the current to ensure precise control of the extraction amount of the glass liquid and the uniformity of the temperature of the glass liquid after the extraction amount adjustment. When the extraction amount of the glass liquid decreases in the forming process, the currents of the inner heater (6) and the outer heater (8) are simultaneously decreased, and the temperature of the glass liquid is controlled to decrease uniformly by the reduction of the current. A method for controlling the substrate glass extraction amount and homogenizing the glass liquid supply, characterized in that when the extraction amount of the glass liquid increases in the forming process, the currents of the inner heater (6) and the outer heater (8) are simultaneously increased, and the temperature of the glass liquid is controlled to increase uniformly by the increase of the current.

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