Plate glass forming device and forming method

Abstract

The invention relates to a plate glass forming device and method, and the plate glass forming device comprises a material supply mechanism, a material distribution mechanism, a forming mechanism, a traction mechanism and a heat preservation and temperature regulation system, the material distributing mechanism comprises a feeding port formed below a discharging nozzle of the feeding mechanism, a guide plate arranged below the feeding port, an extending table top connected with the guide plate and a discharging port formed in the edge side of the extending table top, and the discharging port and the guide plate are arranged on the front side and the rear side of the extending table top correspondingly. Molten glass on the extension table board can flow and extend and flow towards the discharge port. The forming mechanism is arranged below the discharging port and comprises a plurality of forming roller sets and a cooling assembly, each forming roller set comprises two parallel pressing rollers, and the cooling assembly can cool the pressing rollers; the drawing mechanism can draw and convey the glass belt; the heat preservation and temperature adjustment system can conduct heat preservation on glass materials in the feeding mechanism, the material distribution mechanism and the forming mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of flat glass production, and particularly relates to a flat glass forming device and a forming method. Background Art

[0002] Flat glass is widely used in industries such as construction, photovoltaics, and displays. Currently, the main processes for large-scale production of flat glass are the float process, the horizontal rolling process, the slot-draw process, the overflow-draw process, and the horizontal draw process. With the wide application of large-screen display devices in the 5G era, the market has put forward more stringent requirements for the performance of cover glass, such as high strength and scratch resistance. At the same time, the trend of mobile phone lightness also requires the cover glass to have the required performance while being as thin as possible. In this context, low-liquid-phase-viscosity glass has become the core material for display glass manufacturing due to its advantages of low melting energy consumption and fast forming speed. However, the traditional flat glass production process cannot solve the problems of uneven thickness, surface defects, and crystallization and devitrification that occur during the production of flat glass in glass systems with high crystallization tendency and low high-temperature viscosity. Summary of the Invention

[0003] In view of the above-mentioned disadvantages of the prior art, the technical problem to be solved by the present invention is to provide a flat glass forming device and a forming method, which can solve the problems of uneven glass thickness, surface defects, crystallization and devitrification caused by high crystallization tendency and low high-temperature viscosity in the traditional process.

[0004] To achieve the above object, the present invention provides a flat glass forming device, including a feeding mechanism, a distributing mechanism, a forming mechanism, a traction mechanism, and a heat preservation and temperature adjustment system. The feeding mechanism can store molten glass liquid and is provided with a discharge nozzle for outputting the molten glass liquid. The distributing mechanism includes a feeding port arranged below the discharge nozzle, a guiding plate arranged below the feeding port, an extended table surface connected to the guiding plate, and a discharge port arranged on the edge side of the extended table surface. The discharge port and the guiding plate are respectively arranged on the front side and the rear side of the extended table surface, and the discharge port extends along the front side edge of the extended table surface. The guiding plate can guide the molten glass liquid falling thereon to the extended table surface, and the molten glass liquid on the extended table surface can flow and extend and flow towards the discharge port. The forming mechanism is arranged below the discharge port and includes a plurality of forming roll groups and a cooling component. Each forming roll group includes two parallel pressing rolls, and there is a forming gap between the two pressing rolls. The forming gap of the forming roll group is used for the molten glass liquid coming out of the discharge port to pass through, and the pressing rolls can extrude the molten glass liquid to form a glass ribbon. The cooling component can cool down the pressing rolls. The traction mechanism can traction and convey the glass ribbon coming out of the forming mechanism. The heat preservation and temperature adjustment system can heat-preserve the glass materials in the feeding mechanism, the distributing mechanism, and the forming mechanism.

[0005] Further, the feeding mechanism includes a barrel, a stirring rod disposed in the barrel, and a stirring driving assembly for driving the movement of the stirring rod.

[0006] Further, the discharge nozzle is disposed at the lower end of the barrel. The feeding mechanism further includes a throttle block disposed in the barrel and above the discharge nozzle, and a lifting driving assembly capable of driving the throttle block to move up and down.

[0007] Further, the cloth laying mechanism includes a lip brick laid, and the upper surface of the lip brick constitutes an extended tabletop.

[0008] Further, the extended tabletop gradually and gently becomes lower from the back to the front, and also gradually and gently becomes lower from the middle to the left and right sides.

[0009] Further, the side surface of the discharge port connected to the front side of the extended tabletop is an arc surface and is smoothly connected to the extended tabletop.

[0010] Further, the height difference H2 between the lower end of the discharge port and the center of the pressing roller of the highest forming roller group in the forming mechanism is 30 - 100 mm.

[0011] Further, there are multiple forming roller groups in the forming mechanism, and they include a primary forming roller group and a shaping roller group. The forming gap width of the primary forming roller group is greater than that of the shaping roller group. The molten glass liquid discharged from the discharge port first passes through the primary forming roller group and then through the shaping roller group.

[0012] Further, a cooling channel is provided in the pressing roller of the forming mechanism, and the cooling assembly is connected to the cooling channel of the pressing roller and can supply a cooling medium to the cooling channel.

[0013] The present invention also provides a flat glass forming method, which is carried out by using the above - mentioned flat glass forming device, and includes the following steps:

[0014] S1. The feeding mechanism outputs the molten glass liquid to the cloth laying mechanism.

[0015] S2. The molten glass liquid enters the extended tabletop through the feed port and the guide plate of the cloth laying mechanism. The glass liquid flows and extends forward and in the left - right directions on the extended tabletop; the molten glass liquid forms a liquid waterfall at the front side of the extended tabletop and falls into the forming mechanism through the discharge port.

[0016] S3. The molten glass liquid enters the forming mechanism and sequentially passes through the forming gaps of each forming roller group. The cooling assembly cools the pressing roller, and the pressing roller rolls to extrude, traction and cool the glass liquid; the glass liquid is shaped into a fixed - shape glass ribbon after passing through all the forming roller groups.

[0017] S4. The shaped glass ribbon enters the traction mechanism and is transported by the traction mechanism.

[0018] As described above, the flat glass forming device and forming method of the present invention have the following beneficial effects:

[0019] 1. The glass liquid is initially flattened by the cloth feeding mechanism, the width and thickness are controlled, and further homogenized to form a glass liquid waterfall and fall into the forming roller set of the forming mechanism. While extruding the glass liquid, the pressing roller rapidly reduces the temperature of the glass liquid, enabling the glass liquid to rapidly spread and thin while quickly dropping below the crystallization temperature, thus achieving rapid spreading and forming while preventing crystallization problems. The temperature after forming is controlled within a specified temperature range by the heat preservation and temperature adjustment system to avoid hardening of the glass ribbon caused by excessive temperature drop. It can be applied to the production of low liquid-phase viscosity glass or similar glass, solving problems such as uneven glass thickness, surface defects, crystallization and devitrification in traditional processes due to high crystallization tendency and low high-temperature viscosity. In particular, it can achieve efficient anti-crystallization forming of low-viscosity glass with a thickness of 0.5 - 2.5 mm, meeting the industrial production requirements for optical glass, high-temperature resistant cover glass, etc.

[0020] 2. In the forming mechanism, by setting the initial forming roller set and the shaping roller set, gradient temperature reduction and hierarchical extrusion forming are achieved, which can better achieve the forming effect, reduce the internal stress of the glass, and improve the mechanical strength of the glass plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the flat glass forming device of the present invention.

[0022] Figure 2 It is a working schematic diagram of the forming mechanism and the traction mechanism in the present invention.

[0023] Figure 3 It is a schematic structural diagram of another embodiment of the forming mechanism in the present invention.

[0024] Explanation of the reference numerals in the drawings:

[0025] 1 - Feeding mechanism, 11 - Stirring rod, 12 - Lifting drive assembly, 13 - Stirring drive assembly, 14 - Barrel, 15 - Discharge nozzle, 16 - Throttle block.

[0026] 2 - Cloth feeding mechanism, 21 - Feed inlet, 22 - Guide plate, 23 - Extension table, 24 - Discharge outlet, 25 - Lip brick, 26 - Arc guide surface.

[0027] 3 - Forming mechanism, 31 - Forming roller set, 311 - Pressing roller, 312 - Forming gap, 32 - Steering roller.

[0028] 4 - Traction mechanism, 41 - Traction roller.

[0029] 5 - Glass ribbon. Detailed implementation manners

[0030] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0031] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have technical essential meanings. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of description and are not used to limit the scope for the implementation of the present invention. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope in which the present invention can be implemented.

[0032] See Figures 1 to 3 , the present invention provides a flat glass forming device, including a feeding mechanism 1, a distributing mechanism 2, a forming mechanism 3 and a traction mechanism 4. The feeding mechanism 1 can store molten glass liquid and is provided with a discharge nozzle 15 for outputting molten glass liquid. The distributing mechanism 2 includes a feeding port 21 arranged below the discharge nozzle 15, a guiding plate 22 arranged below the feeding port 21, an extended table top 23 connected to the guiding plate 22, and a discharge port 24 arranged on the edge side of the extended table top 23. The discharge port 24 and the guiding plate 22 are respectively arranged on the front side and the rear side of the extended table top 23, and the discharge port 24 extends along the front side edge of the extended table top 23. The guiding plate 22 can guide the molten glass liquid falling thereon to the extended table top 23. The molten glass liquid on the extended table top 23 can flow and extend and flow towards the discharge port 24. The forming mechanism 3 is arranged below the discharge port 24 and includes a plurality of forming roller groups 31 and a cooling component. The forming roller group 31 includes two parallel pressing rollers 311, and a forming gap 312 is arranged between the two pressing rollers 311. The forming gap 312 of the forming roller group 31 is used for the molten glass liquid coming out of the discharge port 24 to pass through, and the pressing rollers 311 can extrude the molten glass liquid to form a glass ribbon 5. The cooling component can cool down the pressing rollers 311. The traction mechanism 4 can traction and convey the glass ribbon 5 coming out of the forming mechanism 3. The heat preservation and temperature adjustment system can perform heat preservation on the glass materials in the feeding mechanism 1, the distributing mechanism 2 and the forming mechanism 3.

[0033] The main working principle of the flat glass forming device involved in the present invention is as follows: The molten glass liquid stored in the feeding mechanism 1 is output through the discharging nozzle 15 to the spreading mechanism 2; the molten glass liquid enters the spreading table 23 through the feeding port 21 and the guiding plate 22 of the spreading mechanism 2. The spreading table 23 has an appropriate spreading area, enabling the molten glass liquid to flow on the spreading table 23. During the flowing process, it will spread forward and in the left and right directions, that is, while flowing forward towards the discharging port 24, it will spread and become thinner in the left and right directions. During the flowing process, it will also be further homogenized and the temperature will be more uniform. When the molten glass liquid flows to the front edge, it will spread to a specified width and thickness in the left and right directions; then the molten glass liquid forms a liquid waterfall at the front side of the spreading table 23 and falls through the discharging port 24 into the forming mechanism 3. When the molten glass liquid forms a waterfall, it will be further homogenized; after the molten glass liquid enters the forming mechanism 3, it successively passes through the forming gaps 312 of each forming roll group 31, and the pressing roll 311 rolls, squeezing and pulling the glass liquid, thereby further spreading the glass liquid, controlling its width and thickness, and the cooling component can cool down the pressing roll 311 to control the temperature of the pressing roll 311 within a specified temperature, which can be specifically set according to the crystallization temperature of the glass liquid and actual needs. While squeezing the glass liquid, the pressing roll 311 quickly reduces the temperature of the glass liquid by means of contact conduction, so that the glass liquid is spread and quickly reduced to below the crystallization temperature at the same time. At the same time, the environmental temperature in the forming mechanism 3 is also controlled within the specified requirements by the heat preservation and temperature adjustment system and is lower than the surface temperature of the pressing roll 311 to ensure that the glass liquid / glass ribbon 5 in the forming mechanism 3 is within the specified temperature range (above the glass softening point temperature) while quickly cooling down, avoiding hardening of the glass ribbon 5 caused by excessive cooling; after passing through all the forming roll groups 31, a shaped glass ribbon 5 with a specified thickness and width will be obtained and maintained at a certain temperature. Then the shaped glass ribbon 5 enters the traction mechanism 4, and the traction mechanism 4 continuously performs the work of traction and transportation of the glass ribbon 5, thereby pulling the glass ribbon 5 for continuous production work. The flat glass forming device can be used for the production of flat glass with a low liquid-phase viscosity (liquid-phase viscosity ≤ 50 Pa·s, 1200 °C), especially suitable for glass systems with a narrow crystallization temperature range (ΔT < 90 °C) and a high crystallization tendency (such as lithium aluminosilicate, borosilicate glass, etc.).

[0034] See Figures 1 to 3 , the following further illustrates the present invention with several specific embodiments:

[0035] See Figure 1 and Figure 2, in this embodiment, as a preferred design, the feeding mechanism 1 includes a barrel 14, a stirring rod 11 disposed in the barrel 14, and a stirring drive assembly 13 for driving the movement of the stirring rod 11. The stirring rod 11 is provided with a plurality of blades and realizes stirring by means of rotational movement. The stirring drive assembly 13 can drive the stirring rod 11 to rotate forward and backward, so as to further homogenize the molten glass liquid in the barrel 14. The stirring drive assembly 13 preferably can achieve stepless speed regulation, so that the rotation speed of the stirring rod 11 can be flexibly adjusted as needed. In other embodiments, the stirring rod 11 can also be stirred by other movement methods.

[0036] See Figure 1 and Figure 2 , in this embodiment, as a preferred design, the discharge nozzle 15 is disposed at the lower end of the barrel 14. The feeding mechanism 1 further includes a throttle block 16 disposed in the barrel 14 and above the discharge nozzle 15, and a lifting drive assembly 12 capable of driving the throttle block 16 to move up and down. The throttle block 16 is preferably fixedly connected to the bottom of the stirring rod 11. The lifting drive assembly 12 is connected to the stirring rod 11 and indirectly drives the throttle block 16 to move up and down by driving the stirring rod 11 to move up and down, thereby simplifying the mechanism. The throttle block 16 is preferably spherical crown-shaped, and its bottom is a spherical crown surface. By adopting the above method, by controlling the distance between the throttle block 16 and the discharge nozzle 15, the flow rate of the glass liquid output through the discharge nozzle 15 can be adjusted, which is flexible and convenient to use. In this embodiment, the stirring rod 11 is simultaneously driven by the stirring drive assembly 13 and the lifting drive assembly 12. Both the stirring drive assembly 13 and the lifting drive assembly 12 can adopt existing conventional structures, and the connection methods can also adopt a variety of existing methods. For example, when the lifting drive assembly 12 drives the stirring rod 11 to move up and down, the stirring drive assembly 13 can move up and down synchronously with the stirring rod 11, or the stirring drive assembly 13 can be freely movably connected to the stirring rod 11 in the up and down direction and fixedly connected in the circumferential direction, so as not to affect the up and down movement of the stirring rod 11 while being able to drive the stirring rod 11 to rotate. In addition, the stirring drive assembly 13 and the lifting drive assembly 12 can be an integral body, and a driving device with both lifting and rotating functions is used to achieve this.

[0037] In this embodiment, the barrel 14 is filled with glass liquid. Therefore, the heat preservation and temperature regulation system at the feeding mechanism 1 can adopt the method of electric heating to heat the barrel 14 and the stirring rod 11 to keep them within the set temperature range, and heat and keep warm the glass liquid by directly contacting the barrel 14 and the stirring rod 11 with the glass liquid, so that the glass liquid is within the specified temperature range.

[0038] See Figure 1 and Figure 2, in this embodiment, as a preferred design, the cloth mechanism 2 includes the laid lip bricks 25. The lip bricks 25 can be laid in a single layer or multiple layers and have an appropriate thickness. The upper surface of the lip bricks 25 constitutes the extended tabletop 23, and the front side wall surface of the lip bricks 25 constitutes the rear side wall surface of the discharge port 24. Preferably, the front side wall surface of the lip bricks 25 is an arc surface, that is, the side where the rear side of the discharge port 24 is connected to the extended tabletop 23 is an arc surface, forming the arc guide surface 26. The arc guide surface 26 is smoothly connected to the extended tabletop 23, preferably tangent to each other, which can guide the molten glass on the extended tabletop 23 to better form a waterfall and fall through the discharge port 24. Further, the extended tabletop 23 gradually and gently becomes lower from back to front, and the extended tabletop 23 also gradually and gently becomes lower from the middle to the left and right sides, which is conducive to the flow and extension of the molten glass towards the front side and the left and right sides. In order to better make the molten glass waterfall play an extension effect, as a preferred design, see Figure 1 , the height difference H2 between the lower end of the discharge port 24 and the center of the pressing roller 311 of the highest forming roller set 31 in the forming roller set 31 is 30 - 100 mm, and the height difference H1 between the front side edge of the extended tabletop 23 and the center of the pressing roller 311 of the highest forming roller set 31 in the forming roller set 31 is as small as possible under the condition of ensuring the thickness requirement of the lip bricks 25, so as to effectively control the height of the molten glass waterfall and avoid it being too high or too low.

[0039] See Figure 1 and Figure 2 , in this embodiment, as a preferred design, the front side of the lip bricks 25 extends linearly in the left - right direction, and the obtained discharge port 24 is strip - shaped and also extends linearly. The axis of the pressing roller 311 of the forming roller set 31 below the discharge port 24 is parallel to the linear extension direction of the discharge port 24, so as to ensure that the molten glass falling from the discharge port 24 can better enter the forming gap 312 of the forming roller set 31.

[0040] See Figure 1 and Figure 2 , in this embodiment, the cloth mechanism 2 is provided with a protective cover housing. The guide plate 22 and the lip bricks 25 are arranged inside the protective cover housing. There is a large space inside the cloth mechanism 2. The ambient air of the lip bricks 25 can be heated by combustion or electric heating, so as to heat and keep warm the molten glass extended on the extended tabletop 23. In addition, a platinum layer can also be wrapped on the lip bricks 25. By heating the platinum layer, the molten glass can be directly heated and kept warm by the contact of the platinum layer. During operation, the temperature near the lip bricks 25 is controlled at 1150 - 1350 °C.

[0041] In this embodiment, see Figure 1 , Figure 2 and Figure 3, As a preferred design, there are multiple forming roller groups 31 in the forming mechanism 3, including a rough forming roller group 31 and a shaping forming roller group 31. One or more of the rough forming roller group 31 and the shaping forming roller group 31 can be provided, which can be specifically set according to actual needs. The width of the forming gap 312 of the rough forming roller group 31 is greater than the width of the forming gap 312 of the shaping forming roller group 31. The molten glass liquid coming out of the discharge port 24 first passes through each rough forming roller group 31, is preliminarily pressed thin and widened, and cooled to obtain a rough glass ribbon 5, the thickness of which is close to the target thickness and can be specifically set according to actual needs; then the rough glass ribbon 5 passes through each shaping forming roller group 31, is further pressed thin and shaped, and cooled to obtain a shaped glass ribbon 5. Further, along the glass transmission direction, the rotational speed of the pressing rollers 311 of the forming roller group 31 in the forming mechanism 3 gradually increases, forming a pulling and stretching effect on the glass ribbon 5. By adopting the above-mentioned hierarchical pressing and forming method, the forming mechanism 3 can better obtain the glass ribbon 5 with specified dimensional specifications.

[0042] In this embodiment, referring to Figure 1 , Figure 2 and Figure 3 , further, the cooling assembly controls the pressing rollers 311 in the rough forming roller group 31 and the shaping forming roller group 31 to be at different temperatures. The surface temperature of the pressing rollers 311 of the rough forming roller group 31 is controlled at 400 - 600 °C, and the surface temperature of the pressing rollers 311 of the shaping forming roller group 31 is lower than that of the rough forming roller group 31 and is controlled at 300 - 500 °C, so as to realize gradient cooling during the process of the glass ribbon 5 becoming thinner and better control the temperature change of the glass ribbon 5.

[0043] In this embodiment, cooling channels are provided in the pressing rollers 311 of the forming mechanism 3, and the cooling assembly is connected to the cooling channels of the pressing rollers 311, capable of providing a cooling medium to the cooling channels, facilitating the rapid removal of heat and ensuring the cooling effect.

[0044] In this embodiment, since there are multiple forming roller groups 31 in the forming mechanism 3, along the transmission direction of the glass ribbon 5, the forming roller group 31 in the downstream can be arranged directly below the forming roller group 31 in the upstream, that is, at this time, multiple forming roller groups 31 are arranged in the up - down direction, and the channel for the glass ribbon 5 to pass through is in the up - down direction. Refer to Figure 1 and Figure 2 shown. The forming roller group 31 in the downstream can be arranged obliquely below the forming roller group 31 in the upstream, that is, at this time, the channel for the glass ribbon 5 to pass through formed by multiple forming roller groups 31 is inclined. Refer to Figure 3 shown. As a preferred design, a turning roller 32 is further provided below the last forming roller group 31, which is used to change the direction of the glass ribbon 5 so that it can better enter the traction mechanism 4. Refer toFigure 2 As shown, the glass ribbon 5 coming out of the final forming roller set 31 goes downward and bypasses the lower end of the turning roller 32, and then enters the traction mechanism 4. Preferably, the surfaces of the pressing roller 311 and the turning roller 32 are provided with a reinforced heat-resistant coating. The cooling assembly is also connected to the cooling channels in the turning roller 32 to cool the turning roller 32, and further perform gradient cooling on the glass ribbon 5 through the turning roller 32.

[0045] In this embodiment, the forming roller set 31 and the turning roller 32 are arranged in a protective housing for isolating from the external environment. There is a relatively large space in the forming mechanism 3. The heat preservation and temperature control system at the forming mechanism 3 can heat and keep warm the ambient air around the forming mechanism 3 in the space by means of combustion or electric heating, so as to keep warm the glass ribbon 5 in the forming mechanism 3 and control the temperature range of the glass ribbon 5 after rapid cooling.

[0046] See Figure 1 、 Figure 2 and Figure 3 As a preferred design, the traction mechanism 4 includes a plurality of traction rollers 41 arranged in parallel with each other. The traction rollers 41 are spaced in the horizontal direction to form a conveying roller path. The glass ribbon 5 coming out of the forming mechanism 3 enters onto the traction rollers 41, and the traction rollers 41 rotate to traction the glass ribbon 5 forward. The height of the traction rollers 41 can be slightly higher than that of the turning roller 32. The shaped glass ribbon 5 winds upward from the lower end of the turning roller 32 and enters onto the upper surface of the traction rollers 41. At the beginning of the production work, when the forefront of the shaped glass ribbon 5 reaches the turning roller 32, the shaped glass ribbon 5 is tractioned to the lower end of the turning roller 32 and winds upward by means of manual traction and pushing, and then enters onto the upper surface of the traction rollers 41. Subsequently, the glass ribbon 5 is continuously and automatically tractioned and conveyed forward. Operation windows can be provided on the left and right side walls at the position of the traction rollers 41 in the protective housing of the forming mechanism 3 for the operator to traction and push the glass ribbon 5. Further, a cooling assembly is also provided in the traction mechanism 4 to cool the traction rollers 41, and the temperature of the traction rollers 41 decreases along the conveying direction, so as to further perform gradient cooling when tractioning and conveying the glass ribbon 5.

[0047] The present invention also provides a flat glass forming method, which is carried out by using the above flat glass forming device, and includes the following steps:

[0048] S1. The feeding mechanism 1 outputs the molten glass liquid to the distributing mechanism 2; specifically, in this embodiment, the glass liquid is first stirred and further homogenized in the feeding mechanism 1, and the flow rate of the glass liquid output from the discharge nozzle 15 is controlled by controlling the lifting of the throttle block 16.

[0049] S2. The molten glass liquid enters the extension table 23 through the feed inlet 21 and the guide plate 22 of the cloth feeding mechanism 2. The glass liquid flows and extends forward and in the left and right directions on the extension table 23; the molten glass liquid forms a liquid material waterfall at the front side of the extension table 23 and falls through the discharge outlet 24 and enters the forming mechanism 3. Specifically, in this embodiment, the temperature of the glass liquid on the extension table 23 is also controlled by the heat preservation and temperature regulation system at the cloth feeding mechanism 2, so that the temperature near the lip brick 25 is 1150 - 1350 °C, thereby controlling the temperature of the glass liquid thereon to be 1150 - 1350 °C.

[0050] S3. The molten glass liquid enters the forming mechanism 3 and successively passes through the forming gaps 312 of each forming roll group 31. The cooling assembly cools the pressing roll 311, and at the same time, the pressing roll 311 rolls to extrude, traction and cool the glass liquid; the glass liquid is shaped into a shaped glass ribbon 5 after passing through all the forming roll groups 31. Specifically, in this embodiment, when the glass liquid falls through the discharge outlet 24, its temperature will drop by a certain amount, and then it enters the forming mechanism 3, where the appropriate temperature is controlled by the heat preservation and temperature regulation system. The glass liquid first passes through the initial forming roll group 31, is extruded and widened while rapidly cooling down to form an initial shaped glass ribbon 5, and then passes through the final forming roll group 31, is further extruded and widened while rapidly cooling down, and then exits after passing through the turning roll 32. Along the conveying direction of the glass ribbon 5, the temperature of the pressing roll 311 is decreasing. The surface temperature of the pressing roll 311 of the initial forming roll group 31 is 400 - 600 °C, and the surface temperature of the pressing roll 311 of the final forming roll group 31 is lower, controlled at 300 - 500 °C. Along the conveying direction of the glass ribbon 5, the rotational speeds of the pressing roll 311 and the turning roll 32 are increasing. The initial shaped glass ribbon 5 finally becomes a shaped glass ribbon 5 after passing through the final forming roll group 31.

[0051] S3. The shaped glass ribbon 5 enters the traction mechanism 4 and is traction-conveyed by the traction mechanism 4, and then enters the next process to obtain a shaped glass ribbon 5 with the set specification dimensions. Specifically, in this embodiment, referring to Figure 2 , the shaped glass ribbon 5 winds upward from the lower end of the turning roll 32 and enters above the traction roll 41. The traction roll 41 rolls to drive the glass ribbon 5 to move forward.

[0052] As can be seen from the above, the flat glass forming device and forming method involved in the present invention have the following beneficial effects:

[0053] 1. The glass liquid is initially flattened by the cloth mechanism 2, the width and thickness are controlled, and further homogenized to form a glass liquid waterfall and fall into the forming roller set 31 of the forming mechanism 3. While extruding the glass liquid, the pressure roller 311 rapidly reduces the temperature of the glass liquid, causing the glass liquid to rapidly widen and thin while quickly dropping below the crystallization temperature, thus achieving rapid spreading and forming while preventing crystallization problems. The temperature of the formed glass is controlled within a specified temperature range by the heat preservation and temperature adjustment system to avoid hardening of the glass ribbon 5 caused by excessive cooling. It can be applied to the production of low liquid-phase viscosity glass or similar glass, solving problems such as uneven glass thickness, surface defects, crystallization and devitrification in traditional processes due to high crystallization tendency and low high-temperature viscosity. In particular, it can achieve efficient anti-crystallization forming of low-viscosity glass with a thickness of 0.5 - 2.5 mm, meeting the industrial production requirements of optical glass, high-temperature resistant cover glass, etc.

[0054] 2. In the forming mechanism 3, by setting the initial forming roller set 31 and the shaping roller set 31, gradient cooling and hierarchical extrusion forming are realized, which can better achieve the forming effect, reduce the internal stress of the glass, and improve the mechanical strength of the glass plate.

[0055] The above embodiments are only illustrative of the principles and effects of the present invention, and are not used to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A flat glass forming device, characterized in that: It includes a feeding mechanism (1), a cloth-feeding mechanism (2), a forming mechanism (3), a traction mechanism (4) and a heat preservation and temperature regulation system. The feeding mechanism (1) can store molten glass liquid and is provided with a discharge nozzle (15) for outputting the molten glass liquid. The cloth-feeding mechanism (2) includes a feeding port (21) arranged below the discharge nozzle (15), a guide plate (22) arranged below the feeding port (21), an extended tabletop (23) connected to the guide plate (22), and a discharge port (24) arranged on the edge side of the extended tabletop (23). The discharge port (24) and the guide plate (22) are respectively arranged on the front side and the rear side of the extended tabletop (23), and the discharge port (24) extends along the front edge of the extended tabletop (23). The guide plate (22) can guide the molten glass liquid falling thereon to the extended tabletop (23). The molten glass liquid on the extended tabletop (23) can flow and extend and flow towards the discharge port (24). The forming mechanism (3) is arranged below the discharge port (24) and includes a plurality of forming roll groups (31) and a cooling assembly. The forming roll group (31) includes two parallel pressure rollers (311), and a forming gap (312) is arranged between the two pressure rollers (311). The forming gap (312) of the forming roll group (31) is used for the molten glass liquid coming out of the discharge port (24) to pass through, and the pressure rollers (311) can extrude the molten glass liquid to form a glass ribbon (5). The cooling assembly can cool down the pressure rollers (311). The traction mechanism (4) can tractionally convey the glass ribbon (5) coming out of the forming mechanism (3). The heat preservation and temperature regulation system can heat-preserve the glass materials in the feeding mechanism (1), the cloth-feeding mechanism (2) and the forming mechanism (3).

2. The flat glass forming device according to claim 1, characterized in that: The feeding mechanism (1) includes a material barrel (14), a stirring rod (11) arranged in the material barrel (14), and a stirring drive assembly (13) for driving the stirring rod (11) to move.

3. The flat glass forming device according to claim 1 or 2, characterized in that: The discharge nozzle (15) is arranged at the lower end of the material barrel (14). The feeding mechanism (1) further includes a throttle block (16) arranged in the material barrel (14) and above the discharge nozzle (15), and a lifting drive assembly (12) capable of driving the throttle block (16) to move up and down.

4. The flat glass forming device according to claim 1, characterized in that: The cloth-feeding mechanism (2) includes a laid lip brick (25), and the upper surface of the lip brick (25) constitutes the extended tabletop (23).

5. The flat glass forming device according to claim 1 or 4, characterized in that: The extended tabletop (23) gradually and gently becomes lower from back to front, and also gradually and gently becomes lower from the middle to both left and right sides.

6. The flat glass forming device according to claim 1 or 4, characterized in that: The side surface of the discharge port (24) connected to the front side of the extended tabletop (23) is an arc surface and is smoothly connected to the extended tabletop (23).

7. The flat glass forming device according to claim 1 or 4, characterized in that: The height difference H2 between the lower end of the discharge port (24) and the center of the pressure roller (311) of the highest forming roll group (31) in the forming mechanism (3) is 30 - 100 mm.

8. The flat glass forming device according to claim 1, characterized in that: The forming roller sets (31) of the forming mechanism (3) are multiple, and include a primary forming roller set (31) and a shaping roller set (31). The width of the forming gap (312) of the primary forming roller set (31) is greater than the width of the forming gap (312) of the shaping roller set (31). The molten glass liquid coming out of the discharge port (24) first passes through the primary forming roller set (31) and then through the shaping roller set (31).

9. The flat glass forming device according to claim 1, characterized in that: A cooling channel is provided in the pressing roller (311) of the forming mechanism (3). The cooling assembly is connected to the cooling channel of the pressing roller (311) and can supply a cooling medium to the cooling channel.

10. A flat glass forming method, characterized in that: The method is carried out by using the flat glass forming device according to any one of claims 1 to 9, and includes the following steps: S1. The feeding mechanism (1) outputs molten glass liquid to the distributing mechanism (2). S2. The molten glass liquid enters the extension table (23) through the feeding port (21) and the guiding plate (22) of the distributing mechanism (2). The glass liquid flows and extends forward and in the left and right directions on the extension table (23). A liquid material waterfall is formed at the front side of the extension table (23), and the glass liquid falls through the discharge port (24) and enters the forming mechanism (3). S3. The molten glass liquid enters the forming mechanism (3) and sequentially passes through the forming gaps (312) of each forming roller set (31). The cooling assembly cools the pressing roller (311). The pressing roller (311) rolls to extrude, traction and cool the glass liquid. After passing through all the forming roller sets (31), the glass liquid forms a shaped glass ribbon (5). S4. The shaped glass ribbon (5) enters the traction mechanism (4) and is traction-transported by the traction mechanism (4).

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