Kiln device for liquid crystal glass substrate

Abstract

The utility model provides a liquid crystal glass substrate kiln device which comprises a kiln assembly and a heating electrode assembly, the kiln assembly comprises a kiln tank wall and a glass melting tank defined by the kiln tank wall, the heating electrode assembly comprises a plurality of heating electrodes, and the heating electrodes are arranged on the kiln tank wall and located in the glass melting tank. At least two of the plurality of heating electrodes have a predetermined distance to form a power line. According to the technical scheme, the problem that in the prior art, it is difficult to produce more vertical convection for the molten glass so as to improve the molten glass homogenizing capacity of the kiln is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of glass manufacturing, in particular to a liquid crystal glass substrate kiln device. Background Art

[0002] In the manufacturing process of liquid crystal glass substrates, the batch materials are melted into glass liquid in the furnace process and then clarified and homogenized. As the resolution of liquid crystal glass becomes higher and higher, the requirements for the uniformity of glass composition are also increasing.

[0003] In some existing technologies, due to the limitations of electrode design, it is difficult for the kiln to produce more vertical convection for the molten glass, so that it is impossible to enhance the mixing of the molten glass, homogenize the molten glass and eliminate the surface defects of the glass; such as the patent application for a glass kiln with electrically assisted heating with application number CN202311233486.9. Utility Model Content

[0004] A technical problem to be solved by the utility model is that it is difficult to produce more vertical convection for molten glass to improve the kiln's ability to homogenize the molten glass.

[0005] To solve the above technical problems, an embodiment of the present application provides a liquid crystal glass substrate kiln device, comprising: a kiln assembly and a heating electrode assembly, the kiln assembly comprising a kiln pool wall and a glass melting pool surrounded by the kiln pool wall, the heating electrode assembly comprising a plurality of heating electrodes, each heating electrode being arranged on the kiln pool wall and located in the glass melting pool, and at least two of the plurality of heating electrodes having a predetermined distance for forming electric lines.

[0006] In some embodiments, along the flow direction of the molten glass in the furnace assembly, the plurality of heating electrodes have a plurality of columns, and the heating electrodes in the same column have a predetermined distance for forming electric lines.

[0007] In some embodiments, two adjacent heating electrodes in the same column of heating electrodes form a pair of electric grids, and the same column of heating electrodes has a pair of electric grids or multiple pairs of electric grids.

[0008] In some embodiments, the row spacing between adjacent rows of heating electrodes is JW+2R, where: J is a positive integer, W is the shortest distance between the outer edge of the heating electrode and the inner wall of the glass melting pool, and R is the radius of the heating electrode.

[0009] In some embodiments, W is greater than or equal to 450 mm.

[0010] In some embodiments, the row spacing of electrodes in adjacent rows is KW+2R, where K is a positive integer, W is the shortest distance between the outer edge of the heating electrode and the inner wall of the glass melting pool, and R is the radius of the heating electrode.

[0011] In some embodiments, the glass melting tank has n rows of heating electrodes, and a grounding electrode is provided between the nth row of heating electrodes and the throat.

[0012] In some embodiments, the height of the molten glass in the glass melting pool is H, and the distance between the top of the heating electrode and the bottom of the glass melting pool is h, where h=0.6H to 0.9H.

[0013] In some embodiments, the glass melting pool has an aspect ratio of ≤3.

[0014] In some embodiments, the heating electrode is a molybdenum electrode.

[0015] Through the above technical solution, the liquid crystal glass substrate kiln device provided by the present application contains glass liquid through a glass melting pool surrounded by the kiln pool wall, and multiple heating electrodes are arranged on the kiln pool wall. By setting a certain predetermined distance between the center lines of the heating electrodes, electric lines are formed between the two poles of the heating electrodes, so that the glass liquid produces a Joule effect to melt the glass liquid and convectively homogenize it. The technical solution of the present application effectively solves the problem in the prior art that it is difficult to produce more vertical convection for the glass liquid to improve the kiln's ability to homogenize the glass liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A front view of a liquid crystal glass substrate kiln device according to the first embodiment of the present application is shown;

[0018] Figure 2 A top view of a liquid crystal glass substrate kiln device according to the first embodiment of the present application is shown.

[0019] Description of reference numerals:

[0020] 10. Kiln assembly; 11. Kiln pool wall; 12. Glass melting pool; 20. Heating electrode assembly; 21. Heating electrode. DETAILED DESCRIPTION

[0021] The following is a further detailed description of the implementation methods of the present application in conjunction with the accompanying drawings and examples. The detailed descriptions of the following examples and the accompanying drawings are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application. The present application can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0022] The present application provides these embodiments to make the present application thorough and complete, and to fully express the scope of the present application to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0023] It should be noted that, in the description of this application, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing this application and simplifying the description, and do 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 this application. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0024] In addition, the words "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0025] It should also be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0026] All terms used in this application have the same meaning as those understood by those of ordinary skill in the art to which this application belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0027] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0028] like Figure 1 and Figure 2 As shown, embodiment 1 shows a liquid crystal glass substrate kiln device, including: a kiln assembly 10 and a heating electrode assembly 20, the kiln assembly 10 includes a kiln pool wall 11 and a glass melting pool 12 surrounded by the kiln pool wall 11, the heating electrode assembly 20 includes a plurality of heating electrodes 21, each heating electrode 21 is arranged on the kiln pool wall 11 and is located in the glass melting pool 12, and at least two of the plurality of heating electrodes 21 have a predetermined distance for forming electric lines.

[0029] By applying the technical solution of this embodiment, the liquid crystal glass substrate kiln device provided by this application contains glass liquid through the glass melting pool 12 surrounded by the kiln pool wall 11, and multiple heating electrodes 21 are arranged on the kiln pool wall 11. By setting a certain predetermined distance between the center lines of the heating electrodes 21, electric lines are formed between the two poles of the heating electrodes 21, so that the glass liquid produces a Joule effect to melt the glass liquid and convectively homogenize it. The technical solution of this application effectively solves the problem in the prior art that it is difficult to create more vertical convection for the glass liquid to improve the kiln's ability to homogenize the glass liquid.

[0030] like Figure 1 and Figure 2 As shown, in the technical solution of the first embodiment, along the flow direction of the molten glass in the furnace assembly 10, the plurality of heating electrodes 21 have a plurality of rows, and the heating electrodes 21 in the same row have a predetermined distance to form electric lines. The heating electrodes 21 are arranged in a plurality of rows, and the heating method of electric melting is used to heat the glass. Compared with the traditional flame heating melting furnace, the thermal efficiency of glass electric melting is much higher than that of the flame melting furnace because the glass liquid is directly used as the conductor of the Joule heat effect, which saves energy and has no pollution. In addition to the heating effect, the convection of the glass liquid caused by the electrode has a faster flow rate than the convection caused by flame heating, thereby increasing the vertical convection to improve the homogenization capacity of the furnace. The heating electrodes 21 are arranged at a predetermined distance, and the distance between the heating electrodes 21 will affect the distribution of the electric lines between the two electrodes. If they are too far away, the greater the solution resistance, the charge is easily dispersed in the solution phase, and the convection effect is not good. If they are too close, the distribution area of ​​the electric lines will be affected, and the convection effect may also be poor. When the distance is too close, the density of the electric lines is too high, resulting in an increase in the temperature of the glass liquid near the heating electrode 21, which is easy to cause bubbles and other defects, affecting the flatness.

[0031] like Figure 1 and Figure 2As shown, in the technical solution of the first embodiment, two adjacent heating electrodes 21 in the same column of heating electrodes 21 form a pair of electric grids, and the same column of heating electrodes 21 has a pair of electric grids or multiple pairs of electric grids. The electric fluxing device uses single-phase alternating current, and the electric grid is two adjacent heating electrodes 21 in pairs in the same column, wherein one heating electrode 21 of the electric grid is a positive electrode, and the other heating electrode 21 is a negative electrode. In order to prevent mutual influence, the positive and negative electrodes of the two heating electrodes 21 of the two adjacent pairs of electric grids are arranged oppositely. There is glass liquid between the two heating electrodes 21, and the glass liquid itself is an electrolyte solution. Therefore, the glass liquid will form a charge transfer path along the electric line, so that the current flows between the two heating electrodes 21. According to the thermal effect of the current, when the current passes through the conductor, the electrons inside the conductor collide when passing through the resistor, thereby releasing heat energy. As an electrolyte solution, the glass liquid has a certain resistance, so the electric energy is converted into heat energy, thereby realizing the heating of the glass liquid, the temperature of the glass liquid is increased, and the viscosity is reduced, and convection is formed along the direction of the electric flow formed by the two adjacent heating electrodes 21 in the same column. To prevent current disorder, the same column is in the width direction of the glass melting pool 12, that is, a direction perpendicular to the flow direction of the glass liquid, and the extension direction of multiple columns is in the length direction of the glass melting pool 12, that is, the flow direction of the glass liquid.

[0032] like Figure 1 and Figure 2 As shown, in the technical solution of the first embodiment, the row spacing of the heating electrodes 21 in adjacent rows is JW+2R, where: J is a positive integer, W is the shortest distance between the outer edge of the heating electrode 21 and the inner wall of the glass melting pool 12, and R is the radius of the heating electrode 21. The constant j=1-2, which is set in this way to prevent the influence of the electric lines formed between the heating electrodes 21 in two adjacent columns. The heating electrodes 21 in adjacent columns are staggered. When the heights of the heating electrodes 21 are different, since the resistance of the heating electrodes 21 is less than the resistance of the glass liquid, the maximum current passes through the point with the minimum resistance, the temperature of the glass liquid near the heating electrodes 21 is higher than the height of the glass liquid at other positions, and the temperature of the glass liquid at the bottom of the pool is lower than the temperature of the glass liquid at other positions. Therefore, during the heating process, the glass liquid near the heating electrode 21 flows from bottom to top along the electrode surface, and the temperature gradually increases. After leaving the electrode surface, it flows to the bottom of the heating electrode 21, thereby forming a glass liquid flow cycle. As needed, the horizontal heights of the rows of heating electrodes 21 in adjacent columns can also be the same.

[0033] like Figure 1 and Figure 2As shown, in the technical solution of the first embodiment, W is greater than or equal to 450 mm. W is the shortest distance between the outer edge of the heating electrode 21 and the inner wall of the glass melting pool 12. If the distance between the heating electrode 21 and the inner wall of the glass melting pool 12 is too close, when the heating electrode 21 is powered on, the glass liquid near the electrode heats up, and the inner wall of the glass melting pool 12 also heats up accordingly. At the same time, the convection near the inner wall of the glass melting pool 12 is rapidly accelerated, and the erosion of the inner wall of the glass melting pool 12 is aggravated, which shortens the service life of the equipment.

[0034] like Figure 1 and Figure 2 As shown, in the technical solution of the first embodiment, the column spacing of the heating electrodes 21 in adjacent columns is KW+2R, where: K is a positive integer, W is the shortest distance between the outer edge of the heating electrode 21 and the inner wall of the glass melting pool 12, and R is the radius of the heating electrode 21. The constant k=1-4, which is set in this way to ensure that the distance between the heating electrodes 21 in two adjacent columns can form appropriate electric lines, thereby forming convection with the flow direction of the glass liquid. The distance between the heating electrodes 21 will affect the distribution of the electric lines between the two electrodes. If they are too far away, the greater the solution resistance, the easier it is for the charge to be dispersed in the solution phase, resulting in poor convection effect. If they are too close, the distribution area of ​​the electric lines will be affected, and the convection effect may also be poor. When the distance is too close, the density of the electric lines is too high, resulting in an increase in the temperature of the glass liquid near the heating electrode 21, which is easy to cause bubbles and other defects, affecting the flatness.

[0035] like Figure 1 and Figure 2 As shown, in the technical solution of the first embodiment, the glass melting pool 12 has n rows of heating electrodes 21, and a grounding electrode is further provided between the nth row of heating electrodes 21 and the throat. According to the length and width of the glass melting pool 12, the number of rows n=7 to 12, and a grounding electrode is provided between the nth row of heating electrodes 21 and the throat, so as to reduce the voltage when the glass liquid flows out of the throat, thereby preventing electric shock injuries to personnel in the subsequent process.

[0036] like Figure 1 and Figure 2As shown, in the technical scheme of the first embodiment, it is characterized in that the height of the glass liquid in the glass melting pool 12 is H, and the distance between the top of the heating electrode 21 and the bottom of the glass melting pool is h, h=0.6H to 0.9H. The molybdenum electrode is arranged in a bottom insertion manner, which has the advantages of high melting efficiency and continuous advancement, and has a positive effect on increasing the temperature of the glass liquid at the bottom of the melting pool, and is more convenient for the melting production of refractory glass and color glass. At the same time, the bottom insertion method is adopted to install the heating electrode perpendicular to the bottom of the glass melting pool 12. The current flows from one heating electrode 21 to another heating electrode 21, and the amount of current flowing from the top to the bottom of the electrode is always equal. Therefore, a uniform current density distribution is generated in the glass liquid, which not only has little and uniform erosion on the electrode, but also generates a relatively uniform convection of the glass liquid. The depth of the heating electrode 21 inserted into the furnace is different, and the temperature near the electrode and the temperature of the furnace pool wall 11 near the electrode are also different, and the liquid flow caused by this is also different. If the insertion depth is too shallow, it is easy to cause scouring and erosion of the bottom surface of the glass melting pool 12, while if the insertion depth is too high, it is easy to cause poor heating effect of the middle and lower glass liquid, which is not conducive to the melting of the glass liquid and the increase of production. At the same time, because the electric energy introduced by the heating electrode 21 is mainly concentrated on the glass liquid around the heating electrode 21, if the electrode is directly applied to the surface of the glass liquid, in terms of the surface temperature distribution of the glass liquid, it may cause the glass liquid temperature of the corresponding surface of the two electrodes to be higher, and the temperature of the middle glass liquid to be relatively low, which is not conducive to the melting of the glass. According to needs, the bottom insertion depth of each heating electrode 21 can be different, and the electric power applied to each heating electrode 21 is also different.

[0037] like Figure 1 and Figure 2 As shown, in the technical solution of the first embodiment, the aspect ratio of the glass melting pool 12 is ≤3. The length of the glass melting pool 12 is L, and the width is B. In order to ensure a good melting and homogenizing effect, the first embodiment adopts a smaller aspect ratio considering the arrangement of the heating electrodes 21, and the row and column spacing of adjacent heating electrodes 21. And the aspect ratio meets the design specifications of the glass melting furnace.

[0038] like Figure 1 and Figure 2 As shown, in the technical solution of the first embodiment, the heating electrode 21 is a molybdenum electrode. Compared with the traditional platinum electrode and tin oxide electrode, the molybdenum electrode has the characteristics of high melting point, high melting temperature and good oxidation resistance, long service life of the equipment, no continuous precipitation during use, relatively corrosion-resistant, can be infiltrated by glass liquid, so the contact resistance is small, the electrode surface can withstand a higher current density, and the heat loss is small.

[0039] Multiple pairs of burners are arranged along the length of the furnace, which are located above the molten glass melting pool 12 and whose flame direction is orthogonal to the flow direction of the glass liquid. The burner heats the glass liquid by the radiant heat of the flame. There are a number of heating electrodes 21, which are vertically inserted into the glass liquid from the bottom of the melting pool at a fixed distance from each other. Since the molten glass liquid is a conductor, the alternating current forms an electric line between the two electrodes through the electrodes, so that the glass liquid produces a Joule effect to melt and convectively homogenize the glass liquid. The melted and homogenized glass liquid flows out of the glass melting pool 12 from the throat. The grounding electrode is set near the throat to reduce the voltage of the glass liquid out of the throat and avoid electric shock injuries to the personnel in the subsequent process. The length and width ratio of the glass melting pool 12 is ≤3. The electric melting device uses single-phase alternating current. The heating electrode 21 is a forged molybdenum rod with a diameter of 75 to 100 mm, and the weight percentage of molybdenum is ≥99.5%. The grounding electrode is a molybdenum rod with a diameter of ≤40 mm, and the weight percentage of molybdenum is ≥99.5%. The height of the glass liquid level of the glass melting pool 12 is H, and the depth of the heating electrode 21 vertically inserted into the glass liquid from the bottom of the melting pool is h, where h=0.6~0.9H. The heating electrodes 21 are arranged in pairs of independent electric grids in the width direction of the glass melting pool 12. After power is turned on, electric lines are formed in the glass melting pool 12 to heat the glass liquid; 4 rows of heating electrodes 21 are arranged along the width direction of the glass melting pool 12, and the row spacing of the heating electrodes 21 is jW+2R, where the constant j=1~2, W: the shortest distance between the outer edge of the heating electrode 21 and the melting pool wall (kiln pool wall 11), R: the radius of the heating electrode 21, and n rows of heating electrodes 21 are arranged along the length direction of the glass melting pool 12, and the row spacing is kW+2R, where the number of rows n=7~12, and the constant k=1~4. The distance between the heating electrodes 21 around the melting pool wall (kiln pool wall 11) and the melting pool wall (kiln pool wall 11) is R+W. n-1 rows of heating electrodes 21 are arranged along the length direction of the melting pool wall (furnace pool wall 11), and the nth row is equipped with a grounding electrode.

[0040] The difference between the technical solution of the second embodiment and the technical solution of the first embodiment is that: multiple pairs of burners are arranged along the length direction of the furnace pool wall 11, and the burners can be air-assisted combustion or full oxygen combustion as needed. The burner is located above the glass melting pool 12, and the flame direction of the burner is orthogonal to the flow direction of the glass liquid, and the overall temperature of the glass liquid in the glass melting pool 12 is increased by radiation heating. The setting of the burner arranged horizontally in this way is easy to control the temperature, pressure, etc. in the length direction of the kiln, and the flame coverage area is large. Multiple burners can be designed and arranged according to the amount of glass melting to meet the melting amount requirements. In this way, the glass liquid can be radiated and heated by the flame of the burner first, and when the heat of the flame reaches the limit, it is heated from the inside through the heating electrode 21. This method is flexible to use. At the same time, multiple heating electrodes 21 can also be combined with the burner arranged on the furnace pool wall 11 to form electrical joint heating, thereby solving the problem of uneven temperature in the glass liquid of the liquid crystal glass substrate kiln device.

[0041] So far, various embodiments of the present application have been described in detail. In order to avoid obscuring the concept of the present application, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed herein.

[0042] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A liquid crystal glass substrate kiln device, characterized in that: include: A kiln assembly (10), the kiln assembly (10) comprising a kiln pool wall (11) and a glass melting pool (12) surrounded by the kiln pool wall (11); A heating electrode assembly (20), the heating electrode assembly (20) comprising a plurality of heating electrodes (21), each of the heating electrodes (21) being arranged on the furnace pool wall (11) and located in the glass melting pool (12), and at least two of the plurality of heating electrodes (21) having a predetermined distance for forming electric lines.

2. The liquid crystal glass substrate kiln device according to claim 1, characterized in that: The plurality of heating electrodes (21) are arranged in a plurality of rows along the flow direction of the molten glass in the furnace assembly (10), and the heating electrodes (21) in the same row have a predetermined distance for forming the electric force lines.

3. The liquid crystal glass substrate kiln device according to claim 2, characterized in that: Two adjacent heating electrodes (21) in the same column of the heating electrodes (21) form a pair of electric grids. The heating electrodes (21) in the same column have a pair of electric grids or a plurality of pairs of electric grids.

4. The liquid crystal glass substrate kiln device according to claim 3, characterized in that: The row spacing of the heating electrodes (21) in adjacent rows is JW+2R, wherein: J is a positive integer; W is the shortest distance between the outer edge of the heating electrode (21) and the inner wall of the glass melting pool (12); R is the radius of the heating electrode (21).

5. The liquid crystal glass substrate kiln device according to claim 4, characterized in that: The W is greater than or equal to 450 mm.

6. The liquid crystal glass substrate kiln device according to claim 4, characterized in that: The column spacing between adjacent columns of heating electrodes (21) is KW+2R, where: K is a positive integer; W is the shortest distance between the outer edge of the heating electrode (21) and the inner wall of the glass melting pool (12); R is the radius of the heating electrode (21).

7. The liquid crystal glass substrate kiln device according to claim 6, characterized in that: The glass melting pool (12) has n rows of heating electrodes (21), and a grounding electrode is provided between the nth row of heating electrodes (21) and the throat.

8. The liquid crystal glass substrate furnace device according to any one of claims 1 to 7, characterized in that: The height of the glass liquid in the glass melting pool (12) is H, and the distance between the top of the heating electrode (21) and the bottom of the glass melting pool (12) is h, where h=0.6H to 0.9H.

9. The liquid crystal glass substrate furnace device according to any one of claims 1 to 7, characterized in that: The length-to-width ratio of the glass melting pool (12) is ≤3.

10. The liquid crystal glass substrate furnace device according to any one of claims 1 to 7, characterized in that: The heating electrode (21) is a molybdenum electrode.

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