Method for homogenizing high-aluminum ultra-thin glass

Abstract

A kind of high-aluminum ultra-thin glass homogenization method, stirring device for stirring glass liquid is used, the stirring paddle blade is arranged between the stirring paddle beam, the stirring paddle beam is connected with the stirring rod by the stirring paddle shaft, the stirring paddle fixing nut is connected with the lower end thread structure of the stirring paddle shaft and is used to fix the stirring paddle beam, and the fixed pin is fixed by passing through the stirring paddle fixing nut;High-aluminum ultra-thin glass homogenization method is as follows: assemble the accessories of stirring device under cold state;During the heating process of kiln, after the stirring device is installed, the glass depth of kiln reaches a certain depth H, H is the height from liquid level to pool bottom;Then the whole stirring device is installed on the kiln;When the stirring paddle of stirring device is immersed in glass liquid, the immersion depth of stirring paddle in glass is increased, and after the glass completely includes the stirring paddle, the height of stirring paddle is slowly lifted to the normal operating height.

Description

Technical Field

[0001] This invention belongs to the field of high-alumina ultrathin glass manufacturing technology, and specifically relates to a method for homogenizing high-alumina ultrathin glass. Background Technology

[0002] The degree of homogenization of molten glass during the production of high-alumina ultrathin glass not only significantly affects defects such as streaks, glass veins, and bubbles on the glass surface, but also greatly impacts glass forming, thinning, warping, and cutting. Homogenization of high-alumina glass has become a major problem in current production. Unlike traditional soda-lime and medium-alumina glass, homogenization of high-alumina and ultra-high-alumina glass is particularly difficult due to the increasing content of alkali metal oxides in the glass composition. Currently, existing methods for improving the homogenization of molten glass mainly fall into three categories: dry stirring with platinum or platinum alloy stirrers; water-cooled stirrers made of ordinary high-temperature alloys; and stirrers made of high-temperature materials such as molybdenum alloys and refractory materials (platinum-coated). All three types of stirrers have the following problems during use: 1. Platinum or platinum alloy (mainly platinum-rhodium alloy) dry agitators are not only expensive due to the high price of precious metals, but also have extremely high design, processing, operation and maintenance costs. For some glass production lines that use precious metal agitators, the investment in precious metals alone exceeds 40% to 60% of the total investment in the production line.

[0003] 2. In order to control the investment cost of precious metals, some manufacturers reduce the amount of precious metals used by modifying the shape and structure of the agitator during the design stage. This results in an imperfect agitator structure, poor agitator strength and mixing effect, thus affecting the performance.

[0004] 3. The water-cooled agitator uses ordinary heat-resistant alloy steel as its main structure and has internal coolant channels. The coolant mainly consists of circulating cooling water and cooling oil. The continuous circulation of the coolant lowers the agitator temperature, thereby reducing the corrosive effect of the high-temperature alkaline molten glass on the agitator. However, the presence of the cooling device causes a decrease in the temperature of the molten glass within the agitator's operating range. This not only reduces the local uniformity of the molten glass, causing defects in the glass fibers, but also creates non-flowing temperature differences in the forming flow of the molten glass, severely affecting the thinning, warping, and cutting of the glass sheet.

[0005] 4. The cooling medium has a certain probability of leakage, which constantly threatens the stability of the glass melt composition and the safety of the kiln.

[0006] 5. High-alumina glass melt has a high viscosity. Molybdenum alloy and refractory material-coated platinum agitators not only fail to solve the problem of high investment in platinum precious metals, but also have difficulty overcoming the problem of inconsistent expansion coefficients between platinum and agitators. When used in high-viscosity high-alumina glass melt, platinum coating may tear or even fall off. In addition, the potential difference between molybdenum and glass reinforcement coating materials at high temperatures may cause platinum material to melt and molybdenum agitators to break, which has a significant impact on production stability.

[0007] A search revealed a Chinese patent document (publication number CN106277717A) disclosing a glass melt stirring rod. The technology described in this patent document has the following drawbacks: while the glass fiber material is heat-resistant, its hardness is insufficient, making it unsuitable for a split structure. The main shaft is made of molybdenum, and since it is connected to the drive motor, it will inevitably protrude above the molten glass. Molybdenum begins to oxidize in air at 400°C, and the oxidation rate increases rapidly above 600°C. Under high temperatures, the main shaft will oxidize and evaporate completely within a short time, leading to breakage. The published patent technology contradicts common scientific sense, and the provided technology is impossible to implement.

[0008] Chinese patent document (publication number CN204779297 U) discloses a longitudinal stirring device for high-temperature molten glass. However, the technology described in this patent document has a fatal flaw. While the cooling water pipes of the water-cooled stirrer are sealed and pressure-resistant pipes, the stirring rod and stirring blades in this patent are separate structures connected by flanges and bolts to transmit torque. Their internal pipes are interconnected, and this flange connection and internal pipe communication undoubtedly increases the number of cooling water pipe connections, reduces the sealing performance of the cooling water pipes, and increases the risk of leakage. Furthermore, this patent does not depart from the scope of traditional water-cooled stirrers, failing to address the problem of water-cooled stirrers reducing the local uniformity of the molten glass, causing glass fiber defects, and creating non-flowing temperature differences in the forming flow of the molten glass, which severely affects glass sheet thinning, warping, and cutting.

[0009] Chinese patent document (publication number CN102004493A) discloses a transmission control mechanism for a stirring system. It mainly reduces costs by replacing electrical components and realizes the functions of detecting and controlling the rotation speed and the phase of the stirring blades, but does not disclose the stirring effect.

[0010] In summary, the technical problem this invention aims to solve is how to improve the glass liquid homogenization effect during the production of ultra-thin square glass made from medium-aluminum and high-aluminum materials. Summary of the Invention

[0011] The technical problem to be solved by this invention is to provide a method for homogenizing high-alumina ultrathin glass, which solves the problem of heat loss caused by circulating coolant in water-cooled agitators, and avoids the safety hazards to the kiln caused by coolant leakage during the use of agitators; compared with platinum alloy agitators, it reduces fixed asset investment and avoids asset loss caused by fluctuations in precious metal prices.

[0012] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A method for homogenizing high-alumina ultrathin glass employs a stirrer for stirring molten glass. The stirrer includes stirring blades, stirring beams, stirring shaft, stirring blade fixing nuts, fixing pins, and stirring rods. The stirring blades are arranged between the stirring beams. The stirring beams are connected to the stirring rods via the stirring shaft. The stirring blade fixing nuts are connected to the lower end of the stirring shaft via a threaded structure and are used to fix the stirring beams. The fixing pins pass through the stirring blade fixing nuts for fixation. The method for homogenizing high-alumina ultrathin glass is as follows: Assemble the agitator components while they are cold; During the kiln heating process, the agitator is installed after the depth of the kiln glass reaches a certain depth H, where H is the height from the liquid surface to the bottom of the pool. Then install the entire agitator onto the kiln; When the agitator's impeller is immersed in the molten glass, increase the immersion depth of the impeller in the glass. After the glass completely covers the impeller, slowly raise the height of the impeller to the normal operating height.

[0013] Preferably, the range of values ​​for H is: H = (1.5-5)·H 搅拌桨高度 .

[0014] Preferably, the stirrer is preheated in the flame space for 1-20 minutes before installation. After the oxides in the stirring paddle evaporate, it is immersed in the molten glass. This is to prevent the sudden temperature change of the stirring paddle from causing changes in its material structure and resulting in cracks, and to prevent the molybdenum stirring paddle from oxidizing for too long, thus reducing its size and improving the service life of the molybdenum stirring paddle. Preferably, when the agitator is immersed in the molten glass, the immersion depth of the agitator in the glass is increased, and after the glass completely covers the agitator, the height of the agitator is slowly raised to the normal operating height. Preferably, the depth to which the stirrer is immersed in the molten glass is less than the depth to which the necked water bag is immersed, where H1 is the depth to which the necked water bag is immersed in the molten glass, H2 is the depth to which the stirrer is immersed in the molten glass, and ΔH = H1 - H2.

[0015] Preferably, △H is 5mm~250mm.

[0016] Preferably, when the glass reinforcement data is normal and the number of bubbles on the plate surface is higher than before startup, the height of the stirrer is increased and the depth of the stirrer immersed in the molten glass, H2, is reduced; when the glass reinforcement data is abnormal and the number of bubbles on the plate surface is normal, the height of the stirrer is decreased and the depth of the stirrer immersed in the molten glass, H2, is increased; the distance between the stirrer and the bottom brick of the necking pool is 50mm~150mm. Preferably, multiple stirrers are arranged perpendicular to the glass flow direction, with gaps between adjacent stirrers, and the gaps between each stirrer are the same.

[0017] Preferably, the length of the stirring blade crossbeam is equal to the width W2 of the stirrer, and the gap between the stirrers is W1 = (0.5~3)W2; The stirring blades have an irregular structure. The cross-section of the stirring blade 1 is spindle-shaped (including but not limited to shapes with unequal axes of symmetry, such as ellipses and irregular polygons). The stirring blades are mostly arranged symmetrically to improve their shearing and homogenization effect on the molten glass.

[0018] The stirring paddle beam is provided with two beams, each beam having a groove; the two ends of the stirring blade are matched with the corresponding grooves of the two stirring paddle beams. The stirring paddle beam has a through hole in the middle, and the inner diameter φ of the through hole in the middle of the stirring paddle beam is the same as the diameter R of the stirring paddle shaft. The stirring paddle shaft passes through the through hole of the stirring paddle beam. The lower end of the stirring paddle shaft is provided with a threaded structure. The upper end is connected to the stirring rod (the connection method includes but is not limited to threaded connection, key, and pin connection), and the lower end is connected to the stirring paddle fixing nut.

[0019] The lower end of the stirring paddle shaft has a keyway in its threaded structure, and the stirring paddle fixing nut has a fixing hole. The stirring paddle shaft has two symmetrical planes in the middle direction; the fixing pin passes through the fixing hole of the stirring paddle fixing nut and is connected to the keyway at the lower end of the stirring paddle shaft.

[0020] The lower end of the stirring rod is provided with a threaded structure II, which is connected to the upper end of the stirring paddle shaft; The stirring rod has a hollow structure with an inlet water channel and a return water channel inside.

[0021] Preferably, the stirrer starts rotating 2-4 hours after being immersed in the molten glass; the initial stirring speed is 0.5-5 revolutions per minute. The stirrer speed and direction of rotation are adjusted based on the obtained glass plate reinforcement data, wherein: The direction of the stirrer is adjusted individually based on the glass plate reinforcement data and the position of the reinforcement. When the glass plate reinforcement data is abnormal for a short period of time and the abnormal range is less than or equal to the preset range, the stirrer speed is increased. When the glass plate reinforcement data is partially abnormal and the position does not change significantly, adjust the direction of rotation of the corresponding position according to the position of the reinforcement; when the glass plate reinforcement data is abnormal in the middle and normal on both sides, take the center line of the neck as the boundary, the left agitator rotates clockwise and the right agitator rotates counterclockwise in the direction of glass liquid flow; when the glass plate reinforcement data is normal in the middle and abnormal on both sides, take the center line of the neck as the boundary, the left agitator rotates counterclockwise and the right agitator rotates clockwise in the direction of glass liquid flow.

[0022] The present invention can achieve the following beneficial effects: 1. Chinese Patent CN106277717A discloses a glass liquid stirring rod, including a main shaft and a movable block. The main shaft forms a stepped shaft with a large-diameter shaft and a small-diameter shaft, with the small-diameter shaft located above the large-diameter shaft. The upper end of the small-diameter shaft is used to connect to a drive motor. The movable block is set on the steps of the main shaft and forms a hollow sleeve structure that is keyed to the small-diameter section. Stirring blades are respectively set on the outer periphery of the large-diameter section and the movable block. The condensate deposits on the stirring rod are controlled on the detachable movable block. Cleaning the deposits only requires removing the movable block, solving the problem of difficult cleaning of condensate deposits on the stirring rod without minimizing impact on the production process. The main shaft is made of molybdenum, and the movable block is made of platinum. Multiple movable blocks are each equipped with stirring blades of different sizes. Different combinations of stirring blades can achieve different stirring patterns and effects, improving the flexibility of the stirring rod. However, the technology described in this patent document has a fatal flaw: although the glass fiber reinforced material is heat-resistant, its hardness is insufficient, making it unsuitable for a split structure. The spindle is made of molybdenum and is connected to the drive motor, inevitably protruding above the molten glass. Molybdenum begins to oxidize in air at 400°C, and the oxidation rate increases rapidly above 600°C. Under high temperatures, the spindle will oxidize and evaporate completely in a short time, leading to breakage. Compared to the patent document, the advantage of this invention is that it effectively avoids the spindle breakage caused by high-temperature evaporation during use, as described in the patent document.

[0023] 2. Chinese Patent CN204779297 U discloses a longitudinal stirring device for high-temperature molten glass. A motor and reducer are mounted on top of a cage-shaped support, driving the stirring rod to rotate via a claw clutch. The stirring rod is connected to the stirring blades via a flange and bolts at its end, causing the blades to rotate. The stirring rod uses a specific bearing assembly for engagement and positioning. The stirring blades are vertically inserted into the molten glass. Cooling water flows through a floating rotary joint, passes over the stirring blades, and then exits the floating rotary joint. Flow sensors and temperature sensors are installed on each inlet and outlet water pipe to monitor the inlet and outlet water temperatures and flow rates. The stirring rod and stirring blades are separate structures, connected by flanges and bolts to transmit torque. Their internal piping is interconnected, and cooling water flows through the internal piping to cool and protect the stirring blades. Maintenance only requires replacing the stirring blades.

[0024] However, the technology described in this patent document has a fatal flaw. While the cooling water pipes of the water-cooled agitator are sealed and pressure-resistant, the agitator rod and blades in this patent are separate structures connected by flanges and bolts to transmit torque. Their internal pipes are interconnected, and this flange connection and interconnected pipes undoubtedly increase the number of cooling water pipe connections, reducing the sealing performance of the cooling water pipes and increasing the risk of leakage. Furthermore, this patent does not depart from the scope of traditional water-cooled agitators, failing to address the problem of reduced local uniformity of the molten glass, leading to glass fiber defects and non-flowing temperature differences in the forming flow, which severely affects glass sheet thinning, warping, and cutting. This invention solves the heat loss problem caused by circulating coolant in water-cooled agitators, while also preventing coolant leakage during agitator use from posing a safety hazard to the kiln. Compared to platinum alloy agitators, it reduces fixed asset investment and avoids asset loss due to fluctuations in precious metal prices.

[0025] 3. This invention solves the problem of homogenization in float glass high-alumina production and provides a stirring device. The stirring paddle is made of molybdenum alloy, which not only solves the problem of high investment in precious metal stirrers but also solves the problem of secondary unevenness in the high-alumina glass melt caused by water-cooled stirrers, reducing local cooling and crystallization of the glass melt. The stirring rod is made of high-temperature resistant alloy steel water-cooled rod, which reduces the cooling effect on the glass melt while ensuring the strength and stability of the stirring rod. The stirring paddle shaft and stirring rod are connected by threads (but not limited to threaded connections; threaded connections, key connections, slot connections, and other mechanical connections are all within the scope of this patent protection), facilitating quick replacement of the stirring paddle during process adjustments. The stirring rod can still be used, which not only reduces the investment cost of the stirrer but also minimizes process fluctuations in the high-alumina glass melt to ensure the stability of high-alumina ultrathin glass production. Its design allows for quick disassembly, and different specifications of stirrers can be replaced according to different material volumes, drawing volumes, and bottleneck water jackets, making operation quick and simple. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of a high-alumina ultrathin glass homogenizing stirrer; Figure 2 This is a cross-sectional view of the stirring rod of a high-aluminum ultra-thin glass homogenizing stirrer. Figure 3 This is a top view of the crossbeam of the stirring paddle of a high-aluminum ultra-thin glass homogenizing stirrer. Figure 4 This is a schematic diagram of the impeller blade of a high-aluminum ultra-thin glass homogenizing stirrer. Figure 5 This is a top view of the impeller blade of a high-aluminum ultra-thin glass homogenizing stirrer. Figure 6This is a schematic diagram of the impeller shaft of a high-aluminum ultra-thin glass homogenizing stirrer. Figure 7 This is a schematic diagram of a high-aluminum ultra-thin glass homogenizing stirrer impeller fixing nut. Figure 8 This is a schematic diagram of a fixing pin for a high-alumina ultrathin glass homogenizing stirrer. Figure 9 This is a schematic diagram showing the stirrer rotating at a 90° phase angle from the start.

[0027] In the diagram: 1-Agitator blade, 2-Agitator beam, 3-Agitator shaft, 4-Agitator fixing nut, 5-Fixing pin, 6-Agitator rod, 7-Groove, 8-Through hole, 9-Threaded structure one, 10-Keyway, 11-Fixing hole, 12-Flat surface, 13-Agitator shaft mounting groove, 14-Water inlet channel, 15-Water return channel, 16-Flange structure. Detailed Implementation

[0028] Preferred solutions include Figures 1 to 9 As shown, a method for homogenizing high-alumina ultrathin glass employs a stirrer for stirring molten glass. The stirrer includes stirring blades, stirring beams, stirring shaft, stirring blade fixing nuts, fixing pins, and stirring rods. The stirring blades are arranged between the stirring beams, which are connected to the stirring rods via the stirring shaft. The stirring blade fixing nuts are connected to the lower end of the stirring shaft via a threaded structure and are used to fix the stirring beams. The fixing pins pass through the stirring blade fixing nuts for fixation. The method for homogenizing high-alumina ultrathin glass is as follows: 1. Assemble the agitator components while they are cold; 2. During the kiln heating process, the agitator is installed after the kiln glass reaches a certain depth H, where H is the height from the liquid surface to the bottom of the tank; the value range of H is: H = (1.5-5)·H 搅拌桨高度 .

[0029] Before installing the agitator, preheat it in the flame space for 1-20 minutes. After the oxides in the agitator have evaporated, immerse it in the molten glass. This is to prevent the agitator from cracking due to changes in its material structure caused by sudden temperature changes, and to prevent the molybdenum agitator from reducing in size due to excessive oxidation time, thus improving the service life of the molybdenum agitator.

[0030] 3. Then install the entire agitator onto the kiln; 4. When immersing the agitator paddle into the molten glass, increase the immersion depth of the paddle into the glass. After the glass completely covers the paddle, slowly raise the height of the paddle to the normal operating height.

[0031] When immersing the agitator into the molten glass, increase the immersion depth of the agitator into the glass. After the glass completely covers the agitator, slowly raise the height of the agitator to the normal operating height. The depth to which the stirrer is immersed in the molten glass is less than the depth to which the necked water tank is immersed, where H1 is the depth to which the necked water tank is immersed in the molten glass, H2 is the depth to which the stirrer is immersed in the molten glass, and ΔH = H1 - H2. Preferably, ΔH is 5 mm to 250 mm.

[0032] 5. When the glass reinforcement data is normal, but the number of bubbles on the plate surface is higher than before startup, increase the height of the stirrer and reduce the depth of the stirrer immersed in the molten glass, H2. When the glass reinforcement data is abnormal, but the number of bubbles on the plate surface is normal, decrease the height of the stirrer and increase the depth of the stirrer immersed in the molten glass, H2. The distance between the stirrer and the bottom brick of the bottleneck pool should be 50mm to 150mm.

[0033] Preferably, the stirrer starts rotating 2-4 hours after being immersed in the molten glass; the initial stirring speed is 0.5-5 rpm; the initial stirring speed should not be too fast, and the speed should be ≤3 rpm.

[0034] The stirrer speed and direction of rotation are adjusted based on the obtained glass plate reinforcement data, wherein: The direction of the stirrer is adjusted individually based on the glass plate reinforcement data and the position of the reinforcement. When the glass plate reinforcement data is abnormal for a short period of time and the abnormal range is less than or equal to the preset range, the stirrer speed is increased. When the glass plate reinforcement data is partially abnormal and the position does not change significantly, adjust the direction of rotation of the corresponding position according to the position of the reinforcement; when the glass plate reinforcement data is abnormal in the middle and normal on both sides, take the center line of the neck as the boundary, the left agitator rotates clockwise and the right agitator rotates counterclockwise in the direction of glass liquid flow; when the glass plate reinforcement data is normal in the middle and abnormal on both sides, take the center line of the neck as the boundary, the left agitator rotates counterclockwise and the right agitator rotates clockwise in the direction of glass liquid flow. The specific structure of the stirrer is as follows: Preferably, multiple stirrers are arranged perpendicular to the glass flow direction, with gaps between adjacent stirrers, and the gaps between each stirrer are the same.

[0035] Preferably, the length of the stirring blade crossbeam is equal to the width W2 of the stirrer, and the gap between the stirrers is W1 = (0.5~3)W2; The stirring blades have an irregular structure. The cross-section of the stirring blade 1 is spindle-shaped (including but not limited to shapes with unequal axes of symmetry, such as ellipses and irregular polygons). The stirring blades are mostly arranged symmetrically to improve their shearing and homogenization effect on the molten glass.

[0036] The stirring paddle beam is provided with two beams, each beam having a groove; the two ends of the stirring blade are matched with the corresponding grooves of the two stirring paddle beams. The stirring paddle beam has a through hole in the middle, and the inner diameter φ of the through hole in the middle of the stirring paddle beam is the same as the diameter R of the stirring paddle shaft. The stirring paddle shaft passes through the through hole of the stirring paddle beam. The lower end of the stirring paddle shaft is provided with a threaded structure. The upper end is connected to the stirring rod (the connection method includes but is not limited to threaded connection, key, and pin connection), and the lower end is connected to the stirring paddle fixing nut.

[0037] The lower end of the stirring paddle shaft has a keyway in its threaded structure, and the stirring paddle fixing nut has a fixing hole. The agitator shaft has two symmetrical planes in the middle; the fixing pin passes through the fixing hole of the agitator fixing nut and connects to the keyway at the lower end of the agitator shaft. This not only facilitates disassembly but also improves the stability of the structure.

[0038] The lower end of the stirring rod is provided with a threaded structure II, which is connected to the upper end of the stirring paddle shaft; The stirring rod has a hollow structure with an inlet water channel and a return water channel inside.

[0039] The impeller blade 1, impeller crossbeam 2, impeller shaft 3, impeller fixing nut 4, and fixing pin 5 are made of high-temperature resistant materials such as molybdenum alloy (chromium-molybdenum, tungsten-molybdenum alloy).

[0040] The molybdenum alloy composition includes, but is not limited to, Mo, Ti, Zr, Hf, W, and rare earth elements.

[0041] Preferably, the stirring rod is made of high-temperature resistant alloy steel, including but not limited to boiler steel, 304H stainless steel, 310 stainless steel, 310S stainless steel, 321H stainless steel, GH2132 alloy steel, GH4169 alloy steel, GH4169 alloy steel, GH3030 alloy steel, 601 stainless steel, and nickel-based alloys.

[0042] Preferably, the speed and direction of a single agitator are independently controlled.

[0043] The agitator has two rows, preferably with the axis of the second row of agitators located at the center of the gap between the first row of agitators in the drawing direction. The number of agitators in the first row, N1, is different from the number of agitators in the second row, N2, where N1 = N2 + 1. The design of the two rows of agitators serves as a secondary agitation mechanism. The first row of agitators stirs the molten glass, and the second row of agitators performs secondary agitation. The two rows of agitators work together to thoroughly agitate the molten glass flowing through the bottleneck, thereby improving the uniformity of the molten glass. The direction of rotation of the agitators also affects the agitation effect. The direction of rotation of the first and second rows of agitators is detailed in the table below. Table 1 shows the relationship between the agitation effect and the rotation speed under different combinations of agitator rotation directions.

[0044] Table 1

[0045] Preferably, the first and second rows of agitators in the agitator combination scheme 1 rotate in the same direction for optimal effect. Here, the first row refers to the direction closer to the feed inlet, and the second row refers to the direction closer to the tin bath.

[0046] In this embodiment, the distance W1 between the stirrers (the distance between the edges of adjacent stirrers) affects the homogenization effect of the molten glass. As shown in Table 2: Table 2 Comparison of the effects of spacing W1 on the homogenization effect of molten glass

[0047] In this embodiment, the length of the stirring blade beam 2 is the same as the width of the stirrer W2, and the gap between the stirrers W1 = (0.5~3)W2.

[0048] Preferably, the depth to which the stirrer is immersed in the molten glass is less than the depth to which the necked water bag is immersed, where H1 is the depth to which the necked water bag is immersed in the molten glass, and H2 is the depth to which the stirrer is immersed in the molten glass. △H=H1-H2.

[0049] Table 3 Parameters of H1, H2, and ΔH

[0050] △H is between 60η and 80η, and △H ranges from 5mm to 250mm. In some embodiments, preferably, the stirrers have unequal speed combinations, and the speed of the stirrers is symmetrical about the center of the neck, with the speed represented by V. A single-row stirrer is taken as an example.

[0051] Combination 1: V1=V2=V3=V4=Vn=Vn=V4=V3=V2=V1; Combination 2: V1 > V2 > V3 > V4 > Vn = Vn < V4 < V3 < V2 < V1; Combination 3: V1 < V2 < V3 < V4 < Vn = Vn > V4 > V3 > V2 > V1.

[0052] Table 4

[0053] Preferably, the combination of two types of stirrers with a speed greater than that of the middle stirrer is used.

[0054] An agitator is disclosed, comprising an agitator blade 1, an agitator crossbeam 2, an agitator shaft 3, an agitator fixing nut 4, a fixing pin 5, and an agitator rod 6. The agitator blade 1, agitator crossbeam 2, agitator shaft 3, agitator fixing nut 4, and fixing pin 5 utilize molybdenum alloy instead of high-temperature alloy water-cooled agitators or platinum alloy agitators. This solves the heat loss problem caused by circulating coolant in water-cooled agitators and avoids safety hazards to the kiln caused by coolant leakage during agitator operation. Compared to platinum alloy agitators, this reduces fixed asset investment and avoids asset loss due to fluctuations in precious metal prices.

[0055] High-alumina ultrathin glass is difficult to produce due to its high viscosity, tendency to crystallize, and challenges in homogenizing the molten glass. Ordinary float glass production lines cannot handle it. Among the publicly available production methods, high-alumina ultrathin glass is primarily produced using the overflow process and by thinning high-alumina glass sheets using the float process, which drastically increases production costs.

[0056] This patent provides a method for homogenizing high-alumina ultrathin glass, which fundamentally solves the problem of homogenizing float high-alumina glass. It also provides a stirring device with a stirring paddle made of molybdenum alloy, which not only solves the problem of high investment in precious metal stirring devices, but also solves the problem of secondary unevenness of the glass liquid caused by water-cooled stirring devices, thus reducing local cooling and crystallization of the glass liquid.

[0057] The stirring rod is made of high-temperature resistant alloy steel water-cooled rod, which reduces the cooling effect on the molten glass while ensuring the strength and stability of the stirring rod. The stirring paddle and stirring rod are connected by threads, which facilitates quick replacement of the stirring paddle during process adjustments. The stirring rod can also be reused, which not only reduces the investment cost of the agitator, but also minimizes process fluctuations in high-alumina molten glass to ensure the stability of high-alumina ultrathin glass production. Its design allows for quick disassembly, and different specifications of agitators can be replaced according to different material volumes, drawing volumes, and bottleneck water tanks, making operation quick and simple.

[0058] The stirring paddle of this invention is made of molybdenum alloy. During use, the stirring paddle is immersed in the molten glass, which prevents the oxidizing atmosphere in the upper space of the molten glass from oxidizing and volatilizing it, thus ensuring safe and stable operation.

[0059] This invention provides a method for homogenizing high-alumina ultrathin glass, which improves the uniformity of molten glass and provides a stable production environment for glass forming, thinning, warping, glass reinforcement, and cutting of ultrathin glass.

[0060] The ultra-thin glass described in the patent has a thickness of ≤0.25mm compared to ordinary glass.

[0061] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A method for homogenizing high-alumina ultrathin glass, characterized in that: An agitator for stirring molten glass is adopted. The agitator includes a stirring blade, a stirring beam, a stirring shaft, a stirring blade fixing nut, a fixing pin, and a stirring rod. The stirring blade is arranged between the stirring beams. The stirring beams are connected to the stirring rod through the stirring shaft. The stirring blade fixing nut is connected to the lower end of the stirring shaft and is used to fix the stirring beam. The fixing pin passes through the stirring blade fixing nut for fixation. The method for homogenizing high-alumina ultrathin glass is as follows: Assemble the agitator components while they are cold; During the kiln heating process, the agitator is installed after the depth of the kiln glass reaches a certain depth H, where H is the height from the liquid surface to the bottom of the pool. Then install the entire agitator onto the kiln; When the agitator's impeller is immersed in the molten glass, increase the immersion depth of the impeller in the glass. After the glass completely covers the impeller, slowly raise the height of the impeller to the normal operating height. The stirring blades, stirring beam, stirring shaft, stirring nut, and fixing pin are made of molybdenum alloy; the stirring rod is made of high-temperature resistant alloy steel and has a hollow structure with an inlet and outlet water channel inside.

2. The method for homogenizing high-alumina ultrathin glass according to claim 1, characterized in that: The range of values ​​for H is: H = (1.5 - 5)·H 搅拌桨高度 .

3. The method for homogenizing high-alumina ultrathin glass according to claim 1, characterized in that: Preheat the agitator in the flame space for 1-20 minutes before installation. After the oxides in the agitator paddle have evaporated, immerse it in the molten glass.

4. The method for homogenizing high-alumina ultrathin glass according to claim 1, characterized in that: The depth to which the stirrer is immersed in the molten glass is less than the depth to which the necked water bag is immersed, where H1 is the depth to which the necked water bag is immersed in the molten glass, H2 is the depth to which the stirrer is immersed in the molten glass, and ΔH = H1 - H2.

5. The method for homogenizing high-alumina ultrathin glass according to claim 4, characterized in that: △H is 5mm~250mm.

6. The method for homogenizing high-alumina ultrathin glass according to claim 5, characterized in that: When the glass reinforcement data is normal and the number of bubbles on the plate surface is higher than before startup, increase the height of the agitator and reduce the agitator immersion depth H2 in the molten glass. When the glass reinforcement data is abnormal and the number of bubbles on the plate surface is normal, decrease the height of the agitator and increase the agitator immersion depth H2 in the molten glass. The distance between the agitator and the bottom brick of the necking pool should be 50mm to 150mm.

7. The method for homogenizing high-alumina ultrathin glass according to claim 1, characterized in that: Multiple stirrers are arranged perpendicular to the glass flow direction, with gaps between adjacent stirrers, and the gaps between each stirrer are the same.

8. The method for homogenizing high-alumina ultrathin glass according to claim 1, characterized in that: The length of the mixing blade beam is equal to the width of the mixer W2, and the gap between the mixers is W1 = (1~2)W2; The stirring blades have an irregular structure; the cross-section of the stirring blades is spindle-shaped, and the stirring blades are mostly symmetrically distributed to improve their shearing and homogenization effect on the molten glass. The stirring paddle beam is provided with two beams, each beam having a groove; the two ends of the stirring blade are matched with the corresponding grooves of the two stirring paddle beams. The stirring paddle beam has a through hole in the middle, and the inner diameter φ of the through hole in the middle of the stirring paddle beam is the same as the diameter R of the stirring paddle shaft. The stirring paddle shaft passes through the through hole of the stirring paddle beam. The lower end of the stirring paddle shaft is provided with a threaded structure, the upper end is connected to the stirring rod, and the lower end is connected to the stirring paddle fixing nut. The lower end of the stirring paddle shaft has a keyway in its threaded structure, and the stirring paddle fixing nut has a fixing hole. The stirring paddle shaft has two symmetrical planes in the middle direction; the fixing pin passes through the fixing hole of the stirring paddle fixing nut and is connected to the keyway at the lower end of the stirring paddle shaft. The lower end of the stirring rod is provided with a threaded structure II, which is connected to the upper end of the stirring paddle shaft.

9. The method for homogenizing high-alumina ultrathin glass according to claim 1, characterized in that: The stirrer starts rotating 2-4 hours after being immersed in the molten glass; the initial stirring speed is 0.5-5 revolutions per minute. The stirrer speed and direction of rotation are adjusted based on the obtained glass plate reinforcement data, wherein: The direction of the stirrer is adjusted individually based on the glass plate reinforcement data and the position of the reinforcement. When the glass plate reinforcement data is abnormal for a short period of time and the abnormal range is less than or equal to the preset range, the stirrer speed is increased. When the glass plate reinforcement data is partially abnormal and the position does not change significantly, adjust the direction of rotation of the corresponding position according to the position of the reinforcement; when the glass plate reinforcement data is abnormal in the middle and normal on both sides, take the center line of the neck as the boundary, the left agitator rotates clockwise and the right agitator rotates counterclockwise in the direction of glass liquid flow; when the glass plate reinforcement data is normal in the middle and abnormal on both sides, take the center line of the neck as the boundary, the left agitator rotates counterclockwise and the right agitator rotates clockwise in the direction of glass liquid flow.

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