Lip brick for increasing drawing amount in high-quality forming of rolled glass and rolling system

Abstract

The application provides a lip brick with improved drawing amount for high-quality forming of rolled glass and a rolling system, innovatively adopts a tilted lip brick structure design, matches the overall structure setting of lifting the working position height of a rolling machine, effectively shortens the hot arc length of an upper rolling roller, effectively reduces the surface temperature of the rolling roller, and the glass liquid above the tilted lip brick before the rolling machine roller flows and is fed in deep and shallow areas, thereby simultaneously considering the constant temperature and heat preservation needs of the glass liquid, the glass rolling drawing amount and the original sheet product yield are greatly improved, the application has the advantages of high drawing amount, high yield, high product yield, high quality, low cost and the like, and is especially suitable for the continuous rolling forming production field of ultrathin photovoltaic glass.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic glass rolling system technology, and more particularly to a lip brick and rolling system for improving the drawing amount in high-quality forming of rolled glass. Background Technology

[0002] With the continuous development of photovoltaic glass forming technology, the calendering system and process are the key to photovoltaic glass forming, which can directly affect the glass forming drawing amount, i.e. production output, as well as the yield and quality of finished glass.

[0003] Chinese patent CN202510015519.5 discloses a sealed, fully automated photovoltaic glass rolling forming method and equipment. The method involves using a rolling conveying system to transport molten glass into a sealed space after rolling. The molten glass passes through various insulation zones, and under the combined action of these zones and the cooling system, the temperature of the molten glass gradually decreases, forming a glass strip of a certain thickness. This method effectively reduces the ambient temperature around the rolling equipment, thereby significantly improving the lifespan of electronic components on the rolling equipment. The control console controls the movement of each drive system on the rolling equipment, and the detection components collect motion data and feed it back to the console. This allows for rapid optimization of initial glass parameters and the establishment of a process parameter database, facilitating rapid equipment debugging and calibration. This invention significantly reduces the difficulty and cost of initial glass debugging, effectively improves production efficiency and control precision, and ensures the production quality of photovoltaic glass.

[0004] Currently, large-diameter calendering rolls have emerged in the industry, increasing the surface area of ​​the rolls and thus increasing the drawing capacity, thereby improving the production efficiency of photovoltaic glass. However, simply increasing the diameter and drawing speed of the calendering rolls can easily lead to high surface temperatures on the upper roll of the calender. On the one hand, this results in quality defects such as hot roll marks and orange peel on the glass surface. On the other hand, the high-temperature upper roll surface is prone to sticking to the original glass sheet, causing a "roller roll" accident where the original glass sheet rotates with the upper roll and wraps around it, resulting in huge losses. This problem is particularly serious in the forming process of thin glass, where the calendering temperature requirements are even higher. To address this, in order to balance increasing the drawing capacity of glass calendering, improving production efficiency, and ensuring the forming quality of the glass, this invention proposes a new calendering system scheme, which has proven to be highly effective in practice. Summary of the Invention

[0005] To address the shortcomings of existing technologies, one of the objectives of this invention is to provide a lip brick for high-quality forming of rolled glass that increases the drawing amount. This lip brick innovatively adopts a tilted-head structure design, which reduces the depth of the molten glass immersed in and covering the rolling roll, i.e., reduces the thermal arc length, and effectively lowers the surface temperature of the rolling roll. This specifically solves the pain points of high rolling roll surface temperature, such as quality defects on the glass sheet and "roller roll" accidents. Furthermore, the molten glass above the tilted-head lip brick is fed in shallow and deep zones, thus simultaneously taking into account the constant temperature and heat preservation requirements of the molten glass, thereby greatly improving the rolling drawing amount and the yield of the finished sheet.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A lip brick for improving the drawing amount in high-quality forming of rolled glass includes a main brick body portion and a lip portion connected to each other, wherein the guide surface A of the lip portion is higher than the guide surface B of the main brick body portion to form a raised structure, thereby the depth H1 of the glass melt flowing above the guide surface A is less than the depth H2 of the glass melt flowing above the guide surface B.

[0007] As an improvement, the glass liquid bearing area on the guide surface B of the lip brick is an upstream deep isothermal zone, and the cross-sectional area a1 of the glass liquid surface in the upstream deep isothermal zone along the width direction accounts for more than 60% of the total cross-sectional area A1 of the glass liquid surface along the width direction on the upper surface of the lip brick.

[0008] As an improvement, the flow guiding surface A and the flow guiding surface B are connected by a flow guiding slope.

[0009] As a supplementary explanation, the glass liquid carrying area on the guiding surface A is the downstream shallow uplift area, and the glass liquid carrying area on the guiding surface B is the upstream deep isothermal area. The upstream deep isothermal area and the downstream shallow uplift area are connected by an inclined and smooth transition.

[0010] As an improvement, the angle α between the guide slope and the horizontal plane is 30-60°.

[0011] As an improvement, the lip portion is connected to the upper corner of the main brick portion.

[0012] The second objective of this invention is to provide a calendering system for high-quality forming of calendered glass that increases the drawing amount. The system employs a raised lip brick structure that is matched with the working height of the calender to elevate the overall structure, effectively shortening the thermal arc length of the upper calendering roll. In addition, the molten glass in front of the calender roll is fed in shallow and deep zones, thus achieving good constant temperature and heat preservation functions, and greatly improving both the glass calendering drawing amount and the yield of finished sheets.

[0013] To achieve the above objectives, the present invention provides the following technical solution: A calendering system for improving drawing amount in high-quality forming of calendered glass includes: a calendering roll group, the calendering roll group including an upper calendering roll and a lower calendering roll arranged in a vertically cooperating manner; a tail brick; and a lip brick as described above, the lip brick being matched and disposed between the lower calendering roll and the tail brick, wherein the main body portion of the lip brick cooperates with the tail brick, and the lip portion cooperates with the lower calendering roll.

[0014] As an improvement, at least the guiding surface B of the lip brick and the tail brick is lower than the guiding surface C of the upstream passage.

[0015] As a supplementary explanation, the glass melt surface depth H2 in the upstream deep constant temperature zone is greater than the glass melt surface depth H3 at the furnace overflow port, so as to keep the glass melt in front of the rollers meeting the glass forming temperature requirements; especially to meet the higher temperature requirements for thin sheet glass forming.

[0016] As an improvement, the glass liquid bearing area on the guide surface B of the lip brick is an upstream deep isothermal zone, and the cross-sectional area a1 of the glass liquid surface in the upstream deep isothermal zone along the width direction accounts for more than 60% of the total cross-sectional area A1 of the glass liquid surface along the width direction on the upper surface of the lip brick.

[0017] As an improvement, it also includes a melting furnace and a passageway. The melting furnace, passageway, tail brick, lip brick, and rolling roller assembly are connected and arranged sequentially along the upstream and downstream direction of the molten glass. During production, the melting furnace melts the glass raw material into molten glass at high temperature. Then, the molten glass flows through the passageway to the overflow port, and then flows to the tail brick and lip brick. Finally, it is rolled into glass sheets by the rolling roller assembly of the rolling mill.

[0018] As an improvement, the upstream front side of the lip brick is the overflow port for molten glass.

[0019] As a supplementary explanation, the upper surface of the lip brick is stepped, the glass liquid carrying area on the guide surface A is the downstream shallow upturned area, the glass liquid carrying area on the guide surface B is the upstream deep constant temperature area, the glass liquid flows on the upper surface of the lip brick, and the glass liquid surface depth H1 of the downstream shallow upturned area is less than the glass liquid surface depth H2 of the upstream deep constant temperature area, so as to reduce the arc length of the hot arc segment a of the upper calender roll.

[0020] As a supplementary explanation, the hot arc segment refers to the arc segment on the circumference of the calender roll that is directly immersed in the molten glass. Correspondingly, the arc segments on the circumference of the calender roll other than the hot arc segment are called cold arc segments.

[0021] As an improvement, the height and position of the melting furnace, passageway, and tail brick remain unchanged, while the height of the working position of the calender is raised to match the lip brick of the upturned structure.

[0022] The beneficial effects of this invention are as follows: (1) The lip brick structure of the present invention innovatively adopts a raised structure design. The lip part that cooperates with the calender is raised relative to the main brick part, thereby reducing the depth of the glass liquid surface carried on the guide surface of the lip part. This reduces the depth of the glass liquid immersed in and covering the calender roll, i.e., the thermal arc length is reduced, thereby effectively reducing the surface temperature of the calender roll. In addition, the glass liquid surface depth on the guide surface of the lip part is increased to match the reduction of the glass liquid surface depth, so that the glass liquid above the raised lip brick flows and feeds in a deep and shallow zone, thereby taking into account the constant temperature and heat preservation requirements of the glass liquid, thereby greatly improving the calendering drawing amount and the yield of the original sheet.

[0023] (2) The lip brick structure of the present invention forms an upstream deep constant temperature zone and a downstream shallow upturned zone in the width direction. The upstream deep constant temperature zone has a good constant temperature function, which makes the glass liquid entering between the upper and lower rolling rolls of the calender meet the "high temperature and low viscosity" requirements of the thin plate forming process. The downstream shallow upturned zone can shorten the arc length of the hot arc segment of the upper rolling roll of the calender and correspondingly increase the arc length of the cold arc segment, so that the surface temperature of the upper rolling roll can be effectively reduced during the operation of the upper rolling roll. Under the effect of the zoned cooperation, the glass liquid is easier to be pressed into thin shape. The calender does not need higher pressure and the rolling roll does not need greater rigidity, which reduces the design difficulty of the calender and improves the performance of the calender.

[0024] (3) The calendering system of the present invention adopts an overall structure setting of lifting the lip brick with the working position height of the calendering machine, which effectively shortens the thermal arc length of the upper calendering roller. In addition, the glass liquid in front of the calendering roller is fed in different deep and shallow zones, thus taking into account the good constant temperature and heat preservation function, and greatly improving the glass calendering drawing amount and the yield of the original sheet.

[0025] (4) The calendering system of the present invention can effectively reduce the circulation backflow effect of the glass liquid in front of the calendering roll, thereby effectively reducing the probability of "bubble scars" and glass forming defects such as "hot lines" and "hot spots", thereby greatly improving the yield of the original sheet. Furthermore, by effectively reducing the surface temperature of the upper roller of the calender, the pulling amount of glass calendering can be effectively increased, that is, the capacity of the calender is greatly increased, with a capacity increase of 10-20%.

[0026] In summary, this invention has advantages such as high drawing capacity, high output, high yield, high quality, and low cost, and is especially suitable for the continuous rolling forming production of ultra-thin photovoltaic glass (such as 1.5mm). Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a calendering system in the prior art; Figure 2 This is a schematic diagram of the rolling system for increasing the drawing amount in the forming of rolled glass in this invention; Figure 3 This is a schematic diagram of the glass liquid distribution on the upper surface of the upturned lip brick in this invention; Figure 4 This is a front view of the upturned lip brick structure in this invention; Figure 5 for Figure 1 A magnified view of a portion of the image; Figure 6 for Figure 2 A magnified view of a portion of the image; Figure 7 This is a schematic diagram of another embodiment of the lip brick sinking structure. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] Example 1 like Figure 3-4 As shown, a lip brick for improving the drawing amount in high-quality forming of rolled glass includes a main brick body portion 11 and a lip portion 12 connected to each other, wherein the guiding surface A121 of the lip portion 12 is higher than the guiding surface B111 of the main brick body portion 11 to form a raised structure, thereby the liquid surface depth H1 of the molten glass 101 flowing above the guiding surface A121 is less than the liquid surface depth H2 of the molten glass 101 flowing above the guiding surface B111.

[0031] As an improvement, the lip portion 12 is connected to the upper corner of the main brick portion 11.

[0032] In this embodiment, the lip portion 12, which is configured to cooperate with the calender, is raised relative to the main brick portion 11, thereby reducing the depth of the glass liquid surface carried by the guide surface A121 on the lip portion 11. This reduces the thermal arc length of the calender roll, thereby effectively lowering the surface temperature of the calender roll.

[0033] As an improvement, the glass liquid bearing area on the guiding surface B111 of the lip brick 1 is the upstream deep constant temperature zone 110, and the cross-sectional area a1 of the glass liquid 101 surface of the upstream deep constant temperature zone 110 along the width direction accounts for more than 60% of the total cross-sectional area A1 of the glass liquid 101 surface along the width direction on the upper surface of the lip brick 1.

[0034] Based on the upturned structure, the molten glass above the lip brick flows and is fed in deep and shallow zones. In this embodiment, the proportion of a1 in the upstream deep constant temperature zone 110 is further increased, that is, the total volume of molten glass in this zone is increased, so as to simultaneously meet the constant temperature and heat preservation requirements of the molten glass, thereby improving the drawing amount and yield.

[0035] Example 2 like Figure 2 As shown, a calendering system for improving drawing amount in high-quality forming of calendered glass includes a calendering mill, which includes a calendering roll assembly, wherein the calendering roll assembly includes an upper calendering roll 2 and a lower calendering roll 3 arranged in a vertically cooperating manner; a tail brick 6; and a lip brick 1 as described above, wherein the lip brick 1 is matched and disposed between the lower calendering roll 3 and the tail brick 6, wherein the main brick body portion 11 cooperates with the tail brick 6 and the lip portion 12 cooperates with the lower calendering roll 3.

[0036] As a supplementary explanation, the upper surface of the lip brick 1 is stepped. The glass liquid carrying area on the guide surface A121 is the downstream shallow uplift zone 120, and the glass liquid carrying area on the guide surface B111 is the upstream deep constant temperature zone 110. The glass liquid 101 flows on the upper surface of the lip brick 1. The liquid surface depth H1 of the glass liquid 101 in the downstream shallow uplift zone 120 is less than the liquid surface depth H2 of the glass liquid 101 in the upstream deep constant temperature zone 110, so as to reduce the arc length of the hot arc segment a21 of the upper calender roll 2. Figures 5-6 As shown.

[0037] In this embodiment, the guide surface of the lip brick is designed with a stepped, upturned shape, which reduces the depth of the molten glass 101 immersed in and covering the upper calender roll 2. This effectively shortens the arc length of the hot arc segment a21 of the upper calender roll 2, while correspondingly increasing the arc length of the cold arc segment. This achieves effective control of the surface temperature of the calender roll, specifically addressing the pain points of high calender roll surface temperature leading to quality defects such as "hot lines" and "hot spots" in glass products, as well as the "roller roll" accident caused by the easy adhesion of the glass sheet to the surface of the high-temperature calender roll. This results in a significant increase in the yield of finished sheets and the amount of calendering and drawing.

[0038] As a supplementary explanation, the hot arc segment refers to the arc segment on the circumference of the calender roll that is directly immersed in the molten glass. Correspondingly, the arc segments on the circumference of the calender roll other than the hot arc segment are called cold arc segments.

[0039] As an improvement, such as Figure 2 As shown, it also includes a melting furnace 4 and a passage 5. The melting furnace 4, passage 5, tail brick 6, lip brick 1 and calendering roller group are connected in sequence along the upstream and downstream direction of the glass liquid 101. During production, the melting furnace 4 melts the glass raw material into glass liquid 101 at high temperature. Then the glass liquid 101 flows through the passage 5 to the overflow port, and then flows to the tail brick 6 and lip brick 1. It is then calendered into glass plate 102 by the calendering roller group of the calender.

[0040] As an improvement, the upstream front side of the lip brick 1 is the overflow port of the glass liquid 101.

[0041] As an improvement, compared Figures 1-2 As shown, the height and position of the melting furnace 4, passage 5 and tail brick 6 remain unchanged, while the lip brick 1 with the matching upturned structure raises the height of the working position of the calender.

[0042] It should be noted that, in comparison Figures 1-2 As shown, compared to a conventional rolling system, in this embodiment, the height of the furnace 4, passage 5, and tail brick 6 remains unchanged, while the height of the rolling mill's working position is raised to match the height of the lip brick 1 of the tilting structure. Therefore, under the premise that the glass melt 101 level remains constant in the system, compared to... Figures 5-6 As shown, the arc length of the hot arc segment a21 of the upper calendering roller 2 is reduced compared to the traditional lip brick, while the arc length of the hot arc segment b31 of the lower calendering roller 3 remains unchanged compared to the traditional lip brick.

[0043] In this embodiment, the photovoltaic glass forming process includes: the glass raw material is melted into glass liquid 101 at high temperature in the melting furnace 4, the high temperature glass liquid 101 flows to the overflow port through the passage 5, then flows to the tail brick 6 and the lip brick group, and is sent into the gap between the calendering roller group. Under the combined action of the upper calendering roller 2 and the lower calendering roller 3 rotating in opposite directions, the pressure action of the upper and lower calendering rollers and the cooling action, a solid glass plate 102 is formed and continuously output. The glass plate 102 is then sent to the annealing furnace for annealing treatment through the auxiliary roller and transition roller table of the calender.

[0044] It is worth noting that, since small bubbles inevitably exist in the high-temperature molten glass, these small bubbles in front of the roller mainly come from the following two sources. First, during the tens of meters of flow from the clarified high-temperature molten glass leaving the melting section through the neck, transverse passage, and branch passage to the forming overflow port, the refractory material at the bottom of the pool that flows through these sections releases gas when heated, which enters the molten glass and forms small bubbles. This is particularly serious in the early stages of kiln production. In addition, the refractory material at the forming overflow port, such as the lip brick and tail brick, also releases gas after contacting the molten glass, which enters the molten glass and forms small bubbles. This is particularly serious in the early stages of replacing the lip brick. Furthermore, because the molten glass 101 before the upper and lower rolling rolls is fed between the upper and lower rolling rolls by the driving force of the rotation of the upper and lower rolling rolls and is pressed into a glass sheet 102, the driving force of the upper and lower rolling rolls on the molten glass 101 is proportional to the arc length (i.e., the hot arc segment) of the roller surface immersed in it. Figure 6 As shown, since the arc length L21 of the hot arc segment a21 of the upper calendering roll 2 is greater than the arc length L31 of the hot arc segment 31 of the lower calendering roll, the driving force on the molten glass at the upper calendering roll is greater than that at the lower calendering roll. Correspondingly, the flow rate of molten glass driven by the hot arc segment of the upper calendering roll is greater than that driven by the lower calendering roll. However, the flow rate of molten glass carried away by the glass sheet formed between the upper and lower calendering rolls is limited. Therefore, the unbalanced molten glass flow between the upper and lower calendering rolls forms a circulating backflow in front of the rolls. The backflow velocity is proportional to the ratio of the arc length L21 of the hot arc segment of the upper calendering roll to the arc length L31 of the hot arc segment of the lower calendering roll. This L21 / L31 ratio is called the backflow ratio in front of the rolls. Figures 1-2 It is evident that the roller-front recirculation ratio L21 / L31 increases with the increase of the depth of the molten glass on the upper surface of the lip brick. However, since the molten glass surface depth H1 in the shallow upturned zone 120 downstream of the upturned lip brick assembly in this embodiment is less than the molten glass surface depth H2' on the upper surface of the traditional lip brick 1', the roller-front recirculation ratio of the upturned lip brick structure in this embodiment is smaller and the circulating flow is weaker. Figure 1 and Figure 2 The swirling arrow circle shown in the glass melt before the middle roller indicates the circulating reflux; The aforementioned issue of in-roller backflow directly affects the quality of glass forming. Specifically, when bubbles in the molten glass enter the in-roller backflow area, they collide with adjacent bubbles during multiple cycles, causing several small bubbles to merge into larger bubbles. When these large bubbles circulate to near the surface of the upper calendering roll, the isolation effect of the bubbles causes a localized thin patch to form between the bubbles and the roll surface. Because this thin patch has a small heat capacity, it forms a cooled glass mass when subjected to the strong cooling effect of the calendering roll surface, which then appears as small black spots on the glass substrate, known as "bubble scars." "Bubble scars" are a product defect in photovoltaic glass, appearing as black spots with a diameter of approximately 10-40 mm on the glass substrate. They periodically appear in bands or strings at fixed locations. Once a "bubble scar" band appears, dozens of products will be scrapped, seriously affecting normal production. As described above, in this embodiment, the arc length of the hot arc segment b31 of the lower calender roll 3 is equal to the arc length of the hot arc segment of the traditional lip brick lower calender roll, but the arc length of the hot arc segment a21 of the upper calender roll 2 is less than the arc length of the hot arc segment of the traditional lip brick lower calender roll. That is, in this embodiment, the roller front recirculation ratio is less than that of the prior art, the circulation flow is weaker, the probability of bubble collision is greatly reduced, it is difficult to form large bubbles that can produce "bubble scars", and small bubbles can be carried away with the glass melt. Moreover, bubbles are difficult to approach the calender roll, and it is difficult to form a cooled glass mass. Therefore, the calendering system of this embodiment can effectively reduce the probability of bubble scar formation, thereby greatly improving the yield of the original sheet.

[0045] Example 3 The components in this embodiment that are the same as or corresponding to those in the above embodiments are referred to by the same reference numerals as those in the above embodiments. For the sake of simplicity, only the differences between this embodiment and the above embodiments are described below. The difference between this embodiment and the above embodiments is that: As an improvement, such as Figure 2 As shown, at least the guiding surface B111 of the lip brick 1 and the tail brick 6 is lower than the guiding surface C51 of the upstream passage 5.

[0046] As one implementation method, such as Figure 6 As shown, the guiding surface B111 of the lip brick assembly is lower than the guiding surface C51 of the upstream passage 5, and the guiding surface of the tail brick 6 is set at the same height as the guiding surface C51; or as another embodiment, such as Figure 7 As shown, the guiding surface B111 of the lip brick group is set at the same height as the guiding surface of the tail brick 6 and is lower than the guiding surface C51 of the upstream passage 5.

[0047] As a supplementary explanation, the liquid level depth H2 of the molten glass 101 in the upstream deep constant temperature zone 110 is greater than the liquid level depth H3 of the molten glass 101 at the overflow port of the melting furnace 4, so as to keep the molten glass in front of the rollers from meeting the glass forming temperature requirements; especially to meet the higher temperature requirements for thin sheet glass forming.

[0048] It is worth noting that this embodiment employs a stepped, upturned design on the guide surface of the lip brick assembly, which divides the molten glass flowing over the upper surface of the lip brick assembly into upstream and downstream regions along the width of the lip brick assembly. The region near the upper and lower calendering rolls is the downstream shallow upturned region 120. (Comparison and...) Figures 5-6 As shown, since the depth H1 of the molten glass flowing through this area in this embodiment is less than the depth H2' of the molten glass flowing through this location in the prior art, the reduction amount Δh=H2'-H1, thereby reducing the arc length of the hot arc segment a21 of the upper calender roll 2 immersed in the high-temperature molten glass and correspondingly increasing the cold arc segment of the upper roll, thus effectively reducing the surface temperature of the upper calender roll 2.

[0049] In addition, since the molten glass inevitably experiences a temperature drop during its flow, the temperature of the molten glass downstream of the lip brick is lower than that upstream. The temperature of the molten glass at the very upstream of the lip brick is 1030℃, and it drops to 1000℃ at its very downstream end (i.e., the temperature of the molten glass before the rollers). For the lip brick assembly in this embodiment, corresponding to the downstream shallow upturned area 120, the area far from the upper and lower calendering rollers is the upstream deep constant temperature area 110. Because the molten glass in the downstream shallow upturned area 120 is shallow, the temperature drop is rapid. Since the temperature requirement for the molten glass to remain constant when entering the calendering roller assembly for calendering remains unchanged, a sinking design is adopted to ensure that the temperature of the molten glass flowing through the lip brick assembly and into the calendering roller assembly meets the requirements in this embodiment. Specifically, combined with... Figure 3 , Figure 6 As shown, the depth difference H2-H1 between the guide surface B111 and the guide surface A121 of the lip brick assembly above the liquid glass 101 is defined as the sinking depth H4 of the raised lip brick 1. Figure 6 As shown, in this embodiment, by setting the liquid surface depth H2 of the glass melt 101 in the upstream deep constant temperature zone 110 to be greater than the liquid surface depth H3 of the glass melt 101 at the overflow port of the melting furnace 4, that is, by designing the guide surface B111 to be relatively sunken, the upstream deep constant temperature zone 110 can carry a larger capacity of glass melt 101, thereby maintaining a relatively high temperature to meet the process requirements of high temperature and low viscosity required for thin plate forming glass melt.

[0050] It is worth noting that by adopting the above-mentioned sinking design, the upstream deep constant temperature zone 110 has a good constant temperature and heat preservation function. Therefore, it can meet the temperature requirements for glass forming without changing the temperature of the glass melt output. That is, in this embodiment, the temperature of the glass melt at the uppermost part of the lip brick group is still maintained at 1030℃ in the traditional rolling system, and the temperature of the glass melt in front of the roll can still be maintained at 1000℃. Furthermore, since the width of the downstream shallow rising zone 120 is short, the downstream shallow rising zone 120 can be quickly carried away by the rolling roll group, thereby shortening the temperature drop time, meeting the forming temperature process requirements, simplifying the process, eliminating the need for additional adjustment of supporting equipment, simplifying process control, and saving costs.

[0051] As an improvement, such as Figure 3 As shown, the glass liquid bearing area on the guide surface B111 of the lip brick 1 is the upstream deep constant temperature zone 110. The cross-sectional area a1 of the glass liquid 101 surface in the upstream deep constant temperature zone 110 along the width direction accounts for more than 60% of the total cross-sectional area A1 of the glass liquid 101 surface along the width direction on the upper surface of the lip brick 1.

[0052] In a preferred embodiment, the sinking depth H4 is set to be greater than Δh, more preferably H4 > 2Δh, and the cross-sectional area a1 of the glass melt 101 surface in the upstream deep constant temperature zone 110 along the width direction is larger than a1 / A1 (relative to the downstream shallow upturned zone 120), more preferably a1 / A1 > 60%, thereby ensuring that the glass melt cross-sectional area A1 on the upper surface of the upturned lip brick group in this embodiment is greater than the glass melt cross-sectional area A2 on the upper surface of the traditional lip brick 1' (relative to the downstream shallow upturned zone 120). Figures 5-6 As shown in the figure, the heat capacity of the molten glass on the upper surface of the raised lip brick group in this embodiment is greater than that of the molten glass on the upper surface of the traditional lip brick. A larger molten glass heat capacity indicates that the temperature of the molten glass can be maintained better (less cooling). That is, the heat preservation performance of the raised lip brick group in this embodiment is better and it has the function of maintaining a relatively high temperature. Since the forming of thin glass requires higher temperatures, the rolling system of this embodiment can fully meet the process requirements of high temperature and low viscosity of molten glass for thin glass forming. It is especially suitable for continuous rolling forming production of ultra-thin photovoltaic glass with high output, high yield and high quality.

[0053] In one specific implementation, the total width of the lip brick assembly in this embodiment is 250mm, of which the width of the upturned lip portion 12 is 100mm, H2=120mm (H2'=100mm), H1=80mm. The working height of the calender needs to be raised by 8mm, and the height of the hot arc section a21 of the ground calender roll 2 immersed in the molten glass is reduced by 8mm. In actual production, it has been found that the temperature of the calender roll can be effectively reduced by >130℃, and the cooling effect is very significant. This effectively solves the problem of roll overheating mentioned in the background art. Using the calendering system of this embodiment, the applicant has been able to produce 1.5mm ultrathin glass.

[0054] Example 4 The components in this embodiment that are the same as or corresponding to those in the above embodiments are referred to by the same reference numerals as those in the above embodiments. For the sake of simplicity, only the differences between this embodiment and the above embodiments are described below. The difference between this embodiment and the above embodiments is that: As an improvement, such as Figure 4 As shown, the flow guiding surface A121 and the flow guiding surface B111 are connected by the flow guiding inclined surface 131.

[0055] As a supplementary explanation, such as Figure 3 As shown, the upstream deep constant temperature zone 110 and the downstream shallow raised zone 120 are connected by an inclined smooth transition.

[0056] In this embodiment, by connecting the flow guiding surface A121 and the flow guiding surface B111 through the flow guiding slope 131, on the one hand, it can help reduce the backflow effect before the roller, making it difficult for the bubbles carried by the glass liquid to approach the upper rolling roller, thereby effectively reducing the probability of bubble scars and greatly improving the yield of the original sheet; on the other hand, it can facilitate the smooth flow of the glass liquid and effectively avoid the deposition of impurities.

[0057] In a preferred embodiment, the angle α between the guide slope 131 and the horizontal plane is 30-60°.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lip brick for improving drawing amount in high-quality forming of rolled glass, characterized in that, It includes an interconnected main brick body portion (11) and a lip portion (12), wherein the guide surface A (121) of the lip portion (12) is higher than the guide surface B (111) of the main brick body portion (11) to form a raised structure, thereby the liquid surface depth H1 of the glass liquid (101) flowing above the guide surface A (121) is less than the liquid surface depth H2 of the glass liquid (101) flowing above the guide surface B (111); The glass melt carrying area on the guiding surface A (121) of the lip brick (1) is the downstream shallow uplift zone (120), and the glass melt carrying area on the guiding surface B (111) is the upstream deep constant temperature zone (110). The cross-sectional area a1 of the glass melt (101) surface of the upstream deep constant temperature zone (110) along the width direction accounts for more than 60% of the total cross-sectional area A1 of the glass melt (101) surface of the upper surface of the lip brick (1) along the width direction. The guiding surface B (111) of the lip brick (1) is lower than the guiding surface C (51) of the upstream passage (5).

2. The lip brick for improving drawing amount in high-quality forming of rolled glass according to claim 1, characterized in that, The flow guiding surface A (121) and the flow guiding surface B (111) are connected by the flow guiding slope (131).

3. The lip brick for improving drawing amount in high-quality forming of rolled glass according to claim 2, characterized in that, The angle α between the guide slope (131) and the horizontal plane is 30°-60°.

4. The lip brick for improving drawing amount in high-quality forming of rolled glass according to claim 1, characterized in that, The lip portion (12) is connected to the upper corner of the main brick portion (11).

5. A rolling system for improving drawing amount in high-quality forming of rolled glass, characterized in that, include: The calendering roll assembly includes an upper calendering roll (2) and a lower calendering roll (3) arranged in an upper and lower configuration; and a tail brick (6). as well as As described in any one of claims 1-4, the lip brick (1) is matched and disposed between the lower calendering roller (3) and the tail brick (6), wherein the main brick body part (11) cooperates with the tail brick (6) and the lip part (12) cooperates with the lower calendering roller (3).

6. A rolling system for improving drawing amount in high-quality forming of rolled glass according to claim 5, characterized in that, The guiding surface of the tail brick (6) is lower than the guiding surface C (51) of the upstream passage (5).

7. A rolling system for improving drawing amount in high-quality forming of rolled glass according to any one of claims 5-6, characterized in that, It also includes a melting furnace (4) and a passage (5), wherein the melting furnace (4), the passage (5), the tail brick (6), the lip brick (1) and the rolling roller group are sequentially connected in the upstream and downstream direction of the glass melt (101).

8. A rolling system for improving drawing amount in high-quality forming of rolled glass according to claim 7, characterized in that, The height and position of the furnace (4), passage (5) and tail brick (6) remain unchanged, and the lip brick (1) matching the upturned structure raises the height of the working position of the calender.

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