CN109020162B

CN109020162B - Production process of ultrathin photovoltaic glass

Info

Publication number: CN109020162B
Application number: CN201810951231.9A
Authority: CN
Inventors: 巫定健; 林加富; 林乾昌
Original assignee: Taiwan Glass Fujian Photovoltaic Glass Co ltd
Current assignee: Tg Fujian Photovoltaic Glass Co.,Ltd.
Priority date: 2018-08-21
Filing date: 2018-08-21
Publication date: 2021-04-06
Anticipated expiration: 2038-08-21
Also published as: CN109020162A

Abstract

The invention provides a production process of ultrathin photovoltaic glass, which utilizes a smelting furnace to smelt glass raw materials; putting the glass raw material into a smelting furnace and heating to form glass fluid; carrying out float forming on the glass fluid through a metal bath to form an initial glass plate, in particular to a method of immersing molten tin; annealing the initial glass plate by using an annealing chamber to form a finished glass plate; and laminating the finished product glass plate to form the finished product photovoltaic glass plate. Compared with the prior art, the production process of the ultrathin photovoltaic glass can efficiently produce the ultrathin photovoltaic glass, and the performances of the glass such as uniformity, smoothness, flatness, strength and the like are obviously improved.

Description

Production process of ultrathin photovoltaic glass

Technical Field

The invention relates to the field of glass processing technology, in particular to a production technology of ultrathin photovoltaic glass.

Background

The production process of float glass generally includes the steps of batching, melting, forming, annealing, etc. For example, chinese patent No. CN 201410690267.8 discloses a method for manufacturing ultra-thin float glass, comprising the steps of continuously supplying molten glass flowing out from a flow path to a horizontal bath surface of a molten metal bath containing molten metal to form a glass ribbon; in the process that the glass ribbon starts to contact with molten metal and flows towards the slow cooling furnace, the edge width of the glass ribbon is gradually expanded and gradually reduced until the edge width is stable, and a preformed glass ribbon is formed; the flow direction of the glass ribbon is in the transverse direction, edge rollers are arranged on two sides of the glass ribbon, the front end of the area of the placement position of the first pair of edge rollers is transversely partitioned, and the partition line is marked as D1; the rear ends of the areas of the placing positions of the last pair of edge rollers are transversely partitioned, and the partitioning line is marked as D2; the D1 wire is close to the runner, the D2 wire is close to the slow cooling furnace, the D1 wire and the D2 wire divide the molten metal bath area into three areas which are respectively a pre-thinning area, a thinning area and a glass ribbon forming cooling area, the pre-thinning area is close to the runner, and the glass ribbon forming cooling area is close to the slow cooling furnace; the three areas are divided into two side areas and a middle area in the longitudinal direction respectively; the two side parts are positioned at the two longitudinal sides of the middle part; the longitudinal width of the middle area is 70-90% of the longitudinal width of the corresponding part of the molten metal bath area; a heater is arranged in the molten metal bath groove area, and the distance d between the heater and the tin liquid level is as follows: 450mm > d >250 mm; the heating power W of the pre-stretching zone heater is not more than 40Kw/m 2; the heating power W of the thin zone heater is not more than 45Kw/m 2; the heating power W of the heater of the forming cooling area is not more than 20Kw/m 2; the average heating power W of the heater in the molten metal bath area is not more than 38Kw/m 2; the heating power of the two side areas of the pre-stretching area is more than 50% of that of the middle area; the edge roller acts directly on the edge area of the glass ribbon in the thinning zone; the heating power of the two areas at the edge part of the thinning area is consistent with that of the corresponding middle area; the heating power of the two areas at the edge of the thinning area accounts for 40-50% of the heating power of the middle area of the thinning area. The heating power of the two edge regions of the glass ribbon forming and cooling region is consistent with that of the middle region of the glass ribbon forming and cooling region. A heater is arranged in the molten metal bath groove area, and the distance d between the heater and the tin liquid level is as follows: 400mm > d >300 mm. The heating power of the two side areas of the pre-stretching area is more than 60 percent of the heating power of the middle area. The two areas at the edge part of the thinning area are respectively divided into two cells, and the heating power of the two cells is 50% of the middle area of the thinning area. The difference between the maximum value and the minimum value of the thickness of the float glass is 0mm to 0.04 mm. The thickness of the ultra-thin float glass is 0.7mm to 1 mm.

The invention can improve the thickness uniformity of the glass to a certain extent, but the production efficiency has great improvement space, and the properties of the glass, such as uniformity, smoothness, flatness, strength and the like, can be further improved and enhanced.

Accordingly, the present inventors have made extensive studies to solve the above problems and have made the present invention.

Disclosure of Invention

The invention aims to provide a production process of ultrathin photovoltaic glass, which can efficiently produce the ultrathin photovoltaic glass and remarkably improves the performances of glass such as uniformity, smoothness, flatness, strength and the like.

In order to achieve the purpose, the invention adopts the following technical scheme:

a production process of ultrathin photovoltaic glass comprises the following steps:

(1) smelting the glass raw materials by using a smelting furnace; putting the glass raw material into a smelting furnace and heating to form glass fluid;

(2) carrying out float forming on the glass fluid through a metal bath to form an initial glass plate;

the metal bath includes an upstream bath at an upstream and a downstream bath at a downstream; the upstream bath room comprises an upstream bath room which is arranged below and used for containing molten tin, an upstream top cover which is covered above the upstream bath room, an upstream tin supply groove which supplies the molten tin to the upstream bath room, and an upstream tin collecting groove which contains the molten tin flowing out from the upstream bath room; the downstream bath room comprises a downstream bath groove positioned below and used for containing molten tin, a downstream top cover covering the upstream bath groove, a downstream tin supply groove used for supplying the molten tin to the downstream bath groove, and a downstream tin collecting groove used for containing the molten tin flowing out from the downstream bath groove; the liquid level of the molten tin in the upstream supply tin bath is higher than the liquid level of the molten tin in the upstream bath, and the liquid level of the molten tin in the downstream supply tin bath is higher than the liquid level of the molten tin in the downstream bath;

the discharge port of the furnace is communicated with the upstream bath; the discharge port is provided with a flow passage control flashboard; a first inclined guide plate gradually lowered from upstream to downstream is arranged between the discharge port and the upstream bath, an initial leveling roller in a horizontal plane is arranged above the first inclined guide plate, the initial leveling roller is vertical to the flow direction of the glass fluid, two ends of the initial leveling roller are provided with initial lifting bearing rods which are vertically arranged, the initial lifting bearing rods penetrate through the upstream top cover, the lower ends of the initial lifting bearing rods are connected with the initial leveling roller through bearings, and the upper ends of the initial lifting bearing rods are provided with initial lifting driving devices; a second inclined guide plate which is gradually lowered from upstream to downstream is arranged between the upstream bath and the downstream bath; a heat insulation wall is arranged between the upstream bathroom and the downstream bathroom, the heat insulation wall comprises an upper wall part above the second inclined guide plate and a lower wall part below the second inclined guide plate, and a gap for glass fluid to pass through is formed between the upper wall part and the lower wall part;

an upstream flattening roller set is arranged in the upstream bathroom; the upstream flattening roller group comprises an upstream base roller parallel to the initial flattening roller, a first upstream guide roller parallel to the upstream base roller and positioned at the upstream of the upstream base roller, a second upstream guide roller parallel to the upstream base roller and positioned at the downstream of the upstream base roller, an upstream sealing support roller parallel to and supported under the upstream base roller, and an upstream extrusion lifting roller parallel to and positioned above the upstream base roller; the upstream base roller, the first upstream guide roller, the second upstream guide roller and the upstream sealing support roller are all positioned below the liquid level of molten tin, the highest point of the upstream extrusion lifting roller is higher than the liquid level of the molten tin, and the highest point of the upstream base roller is lower than the highest points of the first upstream guide roller and the second upstream guide roller; the two ends of the upstream extrusion lifting roller are provided with vertically arranged upstream lifting bearing rods, the upstream lifting bearing rods penetrate through the upstream top cover, the lower ends of the upstream lifting bearing rods are connected with the upstream extrusion lifting roller through bearings, and the upper ends of the upstream lifting bearing rods are provided with upstream lifting driving devices; a first gap for glass fluid to pass through is formed between the upper end of the upstream base roller and the lower end of the upstream extrusion lifting roller, the lower end of the upstream base roller is in contact with the upper end of the upstream sealing support roller, and the lower end of the upstream sealing support roller is in contact with the bottom of the upstream bath; the upstream base roller, the first upstream guide roller, the second upstream guide roller and the upstream seal support roller are connected with the side wall of the upstream bath through bearings; the upstream squeezing lifting roller, the upstream base roller and the upstream sealing support roller divide the upstream bath into a first upstream half zone at the upstream and a second upstream half zone at the downstream; a first tin inlet communicated with the upstream tin supply groove and a first tin outlet communicated with the upstream tin collecting groove are formed in the side wall of the upstream bath groove; the first tin inlet is provided with a first valve, and the first tin outlet is provided with a second valve; the first tin inlet and the first tin outlet are both positioned in the first upstream half zone, and the first tin inlet and the first tin outlet are both positioned below the liquid level of molten tin; a first heating device is arranged in the second upstream half zone; the temperature of the molten tin in the first upstream half is lower than the temperature of the molten tin in the second upstream half, and the temperature of the molten tin in the upstream supply tin bath is lower than the temperature of the molten tin in the first upstream half; the level of molten tin in the first upstream half-zone is level with the level of molten tin in the second upstream half-zone;

a downstream flattening roller set is arranged in the downstream bathroom; the downstream flattening roller group comprises a downstream base roller parallel to the initial flattening roller, a first downstream guide roller parallel to the downstream base roller and positioned at the upstream of the downstream base roller, a second downstream guide roller parallel to the downstream base roller and positioned at the downstream of the downstream base roller, a downstream sealing support roller parallel to and supported under the downstream base roller, and a downstream extrusion lifting roller parallel to and positioned above the downstream base roller; the downstream base roller, the first downstream guide roller, the second downstream guide roller and the downstream sealing support roller are all positioned below the liquid level of molten tin, the highest point of the downstream extrusion lifting roller is higher than the liquid level of the molten tin, and the highest point of the downstream base roller is lower than the highest points of the first downstream guide roller and the second downstream guide roller; two ends of the downstream extrusion lifting roller are provided with a downstream lifting bearing rod which is vertically arranged, the downstream lifting bearing rod penetrates through the downstream top cover, the lower end of the downstream lifting bearing rod is connected with the downstream extrusion lifting roller through a bearing, and the upper end of the downstream lifting bearing rod is provided with a downstream lifting driving device; a second gap for glass fluid to pass through is formed between the upper end of the downstream base roller and the lower end of the downstream extrusion lifting roller, the lower end of the downstream base roller is in contact with the upper end of the downstream sealing support roller, and the lower end of the downstream sealing support roller is in contact with the bottom of the downstream bath; the downstream base roller, the first downstream guide roller, the second downstream guide roller and the downstream sealing support roller are connected with the side wall of the downstream bath through bearings; the downstream extrusion lifting roller, the downstream base roller and the downstream sealing support roller divide the downstream bath into a first downstream half zone at the upstream and a second downstream half zone at the downstream; a second tin inlet communicated with the downstream tin supply groove and a second tin outlet communicated with the downstream tin collecting groove are formed in the side wall of the downstream bath groove; the second tin inlet is provided with a third valve, and the second tin outlet is provided with a fourth valve; the second tin inlet and the second tin outlet are both positioned in the first downstream half zone and are both positioned below the liquid level of molten tin; a second heating device is arranged in the second downstream half area; the temperature of the molten tin in the first downstream half is lower than the temperature of the molten tin in the second downstream half, the temperature of the molten tin in the downstream supply tin bath is lower than the temperature of the molten tin in the second downstream half, and the temperature of the molten tin in the first downstream half is lower than the temperature of the molten tin in the second upstream half; the level of molten tin in the first downstream half-zone is level with the level of molten tin in the second downstream half-zone;

the liquid level of the molten tin in the upstream bath is higher than that in the downstream bath;

the upper end of the lower part of the wall is provided with a transition roller parallel to the initial paving roller; the transition roller is positioned at the upstream of the second inclined guide plate and is tangent to the upper surface of the second inclined guide plate, and the upper end of the transition roller is flush with the liquid level of the molten tin in the upstream bath; the transition roller is connected with the side wall of the upstream bath through a bearing;

in the process of forming an initial glass plate by a float method, a controller is used for controlling a flow channel of a smelting furnace to control a flashboard to open, glass fluid flows out of a discharge port and flows downwards along a first inclined flow guide plate, an initial lifting driving device drives an initial lifting bearing rod to drive an initial leveling roller to descend to press the glass fluid, so that the glass fluid is rolled and paved and flows onto the liquid surface of molten tin in a first upstream half area along the first inclined flow guide plate to form a floating glass belt, the glass fluid is continuously supplied along with the smelting furnace, the floating ribbon of glass continues to travel downstream along the molten tin bath, passes over the first and second upstream guide rolls, passes over the transition roll and flows along the second inclined baffle into the first downstream half-zone, passes over the first and second downstream guide rolls, and until the floating ribbon of glass flows out of the second downstream half-zone;

then the controller controls the upstream lifting driving device to drive the upstream lifting carrying rod to drive the upstream extrusion lifting roller to descend so as to press and immerse the floating glass belt between the first upstream guide roller and the second upstream guide roller into molten tin liquid and contact with the upstream base roller, so that the floating glass belt forms a V shape under the support of the first upstream guide roller and the second upstream guide roller, the controller controls the distance between the upstream extrusion lifting roller and the upstream base roller, and the upstream extrusion lifting roller and the upstream base roller are used for extruding, thinning and flattening the floating glass belt; the controller controls the downstream lifting driving device to drive the downstream lifting bearing rod to drive the downstream extrusion lifting roller to descend so as to press and immerse the floating glass belt between the first downstream guide roller and the second downstream guide roller into molten tin liquid and contact with the downstream base roller, so that the floating glass belt forms a V shape under the support of the first downstream guide roller and the second downstream guide roller, the controller controls the distance between the downstream extrusion lifting roller and the downstream base roller, and the downstream extrusion lifting roller and the downstream base roller are used for extruding and flattening the floating glass belt again;

then, the controller is used for controlling the flow of the first valve, the second valve, the third valve and the fourth valve, so that the upstream supply tin bath continuously supplies molten tin with lower temperature to the first upstream half area, the molten tin with higher temperature in the first upstream half area is discharged into the upstream collection tin bath, the downstream supply tin bath continuously supplies molten tin with lower temperature to the first downstream half area, the molten tin with higher temperature in the first downstream half area is discharged into the downstream collection tin bath, the temperature of the molten tin in the first upstream half area is always lower than that of the molten tin in the second upstream half area, and the temperature of the molten tin in the first downstream half area is always lower than that of the molten tin in the second downstream half area;

(3) annealing the initial glass plate by using an annealing chamber to form a finished glass plate;

(4) and laminating the finished product glass plate to form the finished product photovoltaic glass plate.

In the step (2), the height of the first tin inlet is lower than that of the first tin outlet, and the height of the second tin inlet is lower than that of the second tin outlet.

In the step (2), the temperatures of the molten tin in the second upstream half-zone, the second downstream half-zone, the first upstream half-zone and the first downstream half-zone are set from high to low.

In step (2), the temperature of the molten tin bath in the second upstream half-zone is 1047.5-1065 ℃, the temperature of the molten tin bath in the second downstream half-zone is 1030-1047.5 ℃, the temperature of the molten tin bath in the first upstream half-zone is 1012.5-1030 ℃, and the temperature of the molten tin bath in the first downstream half-zone is 996-1012.5 ℃; the molten tin bath in the upstream and downstream supply baths is at a temperature of less than 996 ℃.

In step (2), a first temperature detection device is arranged in the first upstream half zone, a second temperature detection device is arranged in the second upstream half zone, a third temperature detection device is arranged in the first downstream half zone, and a fourth temperature detection device is arranged in the second downstream half zone.

In the step (2), the upstream top cover is formed with an upstream sealing sliding hole in sealing contact with the initial elevating carrier bar and the upstream elevating carrier bar, and the downstream top cover is formed with a downstream sealing sliding hole in sealing contact with the downstream elevating carrier bar.

In the step (2), an initial connecting cross rod is connected between the upper ends of the two initial lifting bearing rods, an upstream connecting cross rod is connected between the upper ends of the two upstream lifting bearing rods, and a downstream connecting cross rod is connected between the upper ends of the two downstream lifting bearing rods.

In the step (2), the upstream sealing and supporting roller comprises a first roller main body and a first high-temperature-resistant sealing layer coated on the peripheral surface of the first roller main body; the downstream sealing support roller comprises a second roller main body and a second high-temperature-resistant sealing layer coated on the circumferential surface of the second roller main body.

After the technical scheme is adopted, the production process of the ultrathin photovoltaic glass breaks through the traditional glass production process form, a smelting furnace smelts glass raw materials to form glass fluid, a flow channel of the smelting furnace is controlled by a controller to control a flashboard to be opened, the glass fluid (higher than 1100 ℃) flows out from a discharge port and flows downwards along a first inclined flow guide plate, an initial lifting driving device drives an initial lifting bearing rod to drive an initial leveling roller to descend to press the glass fluid, the glass fluid is rolled, paved and thinned (similar to a rolling pin) and flows onto the liquid level of molten tin in a first upstream half area along the first inclined flow guide plate to form a floating glass ribbon, the temperature of the molten tin is lower, the fluidity of the glass fluid is reduced, the floating glass ribbon is cooled on the molten tin to form glass viscous flow which has higher viscosity and is difficult to tear, and the glass viscous flow is continuously supplied to the smelting furnace, the floating ribbon of glass continues to travel downstream along the molten tin bath, travels over the first and second upstream guide rolls, over the transition rolls and along the second inclined baffle into the first downstream half, and then travels over the first and second downstream guide rolls until it exits the second downstream half, and then may enter the annealing process, but this portion of glass is waste only, is produced for the purpose of forming a continuous ribbon of glass, and should not be the final product of the present invention. Then the controller controls the upstream lifting driving device to drive the upstream lifting bearing rod to drive the upstream extrusion lifting roller to descend so as to press and immerse the floating glass belt between the first upstream guide roller and the second upstream guide roller into molten tin liquid and contact with the upstream base roller, so that the floating glass belt forms a V shape under the support of the first upstream guide roller and the second upstream guide roller, the distance between the upstream extrusion lifting roller and the upstream base roller is controlled by the controller, the floating glass belt is subjected to thinning and flattening with corresponding thickness by using the upstream extrusion lifting roller and the upstream base roller, the molten tin liquid generates upward buoyancy to the floating glass belt to uniformly stretch and thin, the floating expansion time is reduced, the defect of slow expansion of full utilization of floating is avoided, the expansion speed is improved, and the floating glass belt cannot be broken due to the viscous flow state of the floating glass belt at the moment; the defects such as concave-convex and the like on the upper surface and the lower surface of the floating glass belt can be simultaneously flattened and uniformly melted, and the defects such as scratches, bubbles and the like can not occur; the stress difference caused by the temperature difference generated on the upper surface and the lower surface of the floating glass belt can be avoided, the internal stress is released at the two sides simultaneously, and the deformation and the like are avoided; the floating glass ribbon, after entering the molten tin bath in the second, higher temperature upstream half, releases internal stresses and increases flow, and after passing around the second, upstream guide roll, continues to float and gradually thins at the level of the molten tin bath in the second, upstream half. Meanwhile, the controller controls the downstream lifting driving device to drive the downstream lifting bearing rod to drive the downstream extrusion lifting roller to descend so as to enable the floating glass ribbon between the first downstream guide roller and the second downstream guide roller to be pressed and immersed into molten tin and to be in contact with the downstream base roller, the floating glass ribbon is enabled to form a V shape under the support of the first downstream guide roller and the second downstream guide roller, the distance between the downstream extrusion lifting roller and the downstream base roller is controlled by the controller, the floating glass ribbon is further thinned by utilizing the downstream extrusion lifting roller and the downstream base roller to perform thinning and flattening with corresponding thickness again, the thinning and flattening can further thin the floating glass ribbon, upward buoyancy generated by the molten tin to the floating glass ribbon is uniformly stretched and thinned, the floating and expanding time is reduced, the slow expanding defect of full utilization of floating is avoided, the expanding speed is improved, and the floating glass ribbon is in a viscous flow state at the moment, can not be broken by pulling; the defects such as concave-convex and the like on the upper surface and the lower surface of the floating glass belt can be simultaneously flattened and uniformly melted, and the defects such as scratches, bubbles and the like can not occur; the stress difference caused by the temperature difference generated on the upper surface and the lower surface of the floating glass belt can be avoided, the internal stress is released at the two sides simultaneously, and the deformation and the like are avoided; when the floating glass ribbon enters the molten tin liquid in the second downstream half zone with higher temperature, the internal stress can be released and the fluidity can be enhanced, and when the floating glass ribbon bypasses the second downstream guide roll, the floating glass ribbon can continuously float and gradually spread and thin on the liquid level of the molten tin liquid in the second downstream half zone to achieve the required ultrathin thickness. Then the controller is used for controlling the flow of the first valve, the second valve, the third valve and the fourth valve, so that the upstream supply tin bath continuously supplies molten tin liquid with lower temperature to the first upstream half area, the molten tin liquid with higher temperature in the first upstream half area is discharged into the upstream collection tin bath, the downstream supply tin bath continuously supplies molten tin liquid with lower temperature to the first downstream half area, the molten tin liquid with higher temperature in the first downstream half area is discharged into the downstream collection tin bath, the temperature of the molten tin liquid in the first upstream half area is always lower than that of the molten tin liquid in the second upstream half area, and the temperature of the molten tin liquid in the first downstream half area is always lower than that of the molten tin liquid in the second downstream half area. Simultaneously, heating the molten tin in the second upstream half area by using the first heating device, and keeping the molten tin in the second upstream half area within a higher temperature range; and heating the molten tin in the second downstream half zone by using the second heating device, and keeping the molten tin in the second downstream half zone in a higher temperature range. Then annealing the initial glass plate by using an annealing chamber to form a finished glass plate; and then, laminating the finished product glass plate to form the finished product photovoltaic glass plate. The ultrathin photovoltaic glass with the required thickness can be obtained after two times of staged extrusion, cold and hot alternate soaking and floating expansion, and the staged extrusion step by step and the cold and hot alternate soaking can generate a flexible effect on the floating glass ribbon, so that the floating glass ribbon is not easy to break, and the continuity is stronger. Compared with the prior art, the production process of the ultrathin photovoltaic glass can efficiently produce the ultrathin photovoltaic glass, and the performances of the glass such as uniformity, smoothness, flatness, strength and the like are obviously improved.

Drawings

FIG. 1 is a first partial cross-sectional structural schematic view of the present invention;

FIG. 2 is a partial schematic view of the present invention;

fig. 3 is a second partial sectional structural view of the present invention.

In the figure:

1-furnace 11-flow path control gate 12-first inclined deflector 13-initial leveling roll 131-initial lifting support rod 132-initial lifting driving device 1321-first vertical screw 1322-first motor 133-initial connecting cross bar

211-the upstream bath 2111-the first upstream half 2112-the second upstream half 21121-the first heating device 2113-the first tin inlet 2114-the first tin outlet 212-the upstream roof 213-the upstream supply tin bath 214-the upstream collection tin bath 2151-the upstream base roller 2152-the first upstream guide roller 2153-the second upstream guide roller 2154-the upstream seal support roller 2155-the upstream squeeze lifter roller 21551-the upstream lift carrier bar 21552-the upstream lift drive 215521-the second vertical screw 215522-the second motor 21553-the upstream connecting cross bar 21553

221-downstream bath 2211-first downstream half 2212-second downstream half 22121-second heating device 2213-second tin inlet 2214-second tin outlet 222-downstream roof 223-downstream tin supply groove 224-downstream tin collection groove 23-second inclined flow guide plate 241-upper wall 242-lower wall 2421-transition roller 2251-downstream base roller 2252-first downstream guide roller 2253-second downstream guide roller 2254-downstream seal support roller 2255-downstream extrusion lift roller 22551-downstream lift carrier bar 22552-downstream lift driver 225521-third vertical screw 225522-third motor 22553-downstream connecting cross bar

3-annealing chamber

10-float glass ribbon.

Detailed Description

In order to further explain the technical solution of the present invention, the following detailed description is given by way of specific examples.

The production process of the ultrathin photovoltaic glass disclosed by the invention comprises the following steps as shown in figures 1-3:

(1) smelting a glass raw material by using a smelting furnace 1; putting glass raw materials into a smelting furnace 1 and heating to form glass fluid;

preferably, the metal bath comprises an upstream bath upstream and a downstream bath downstream; the upstream bath room includes an upstream bath 211 below which molten tin is contained, an upstream top cover 212 covering the upstream bath 211, an upstream supply tin bath 213 for supplying molten tin to the upstream bath 211, and an upstream collection tin bath 214 containing molten tin flowing out of the upstream bath 211; the downstream bath includes a downstream bath 221 containing molten tin below, a downstream roof 222 covering the downstream bath 221, a downstream supply tin bath 223 supplying molten tin to the downstream bath 221, and a downstream collection tin bath 224 containing molten tin flowing out of the downstream bath 221; the level of molten tin in the upstream supply tin bath 213 is higher than the level of molten tin in the upstream bath 211, and the level of molten tin in the downstream supply tin bath 223 is higher than the level of molten tin in the downstream bath 221;

preferably, the tapping of the furnace 1 communicates with an upstream bath 211; the discharge port is provided with a flow passage control flashboard 11; a first inclined guide plate 12 gradually lowered from upstream to downstream is arranged between the discharge port and the upstream bath 211, an initial leveling roller 13 in a horizontal plane is arranged above the first inclined guide plate 12, the initial leveling roller 13 is vertical to the flow direction of the glass fluid, two ends of the initial leveling roller 13 are provided with initial lifting bearing rods 131 which are vertically arranged, the initial lifting bearing rods 131 penetrate through an upstream top cover 212, the lower ends of the initial lifting bearing rods 131 are connected with the initial leveling roller 13 through bearings, and the upper ends of the initial lifting bearing rods 131 are provided with initial lifting driving devices 132; a second inclined guide plate 23 which is gradually lowered from upstream to downstream is arranged between the upstream bath 211 and the downstream bath 221; a thermal insulation wall is arranged between the upstream bathroom and the downstream bathroom, the thermal insulation wall comprises an upper wall part 241 above the second inclined guide plate 23 and a lower wall part 242 below the second inclined guide plate 23, and a gap for glass fluid to pass through is formed between the upper wall part 241 and the lower wall part 242;

preferably, an upstream flattening roller set is arranged in the upstream bathroom; the upstream flattening roller group includes an upstream base roller 2151 in parallel with the initial flattening roller 13, a first upstream guide roller 2152 in parallel with the upstream base roller 2151 and upstream of the upstream base roller 2151, a second upstream guide roller 2153 in parallel with the upstream base roller 2151 and downstream of the upstream base roller 2151, an upstream seal support roller 2154 supported in parallel just below the upstream base roller 2151, and an upstream press lifter roller 2155 in parallel just above the upstream base roller 2151; the upstream base roller 2151, the first upstream guide roller 2152, the second upstream guide roller 2153, and the upstream seal support roller 2154 are all below the level of molten tin, and the highest point of the upstream squeeze lifter roller 2155 is higher than the level of molten tin, and the highest point of the upstream base roller 2151 is lower than the highest points of the first upstream guide roller 2152 and the second upstream guide roller 2153; the two ends of the upstream extrusion lifting roller 2155 are provided with an upstream lifting bearing rod 21551 which is vertically arranged, the upstream lifting bearing rod 21551 penetrates through the upstream top cover 212, the lower end of the upstream lifting bearing rod 21551 is connected with the upstream extrusion lifting roller 2155 through a bearing, and the upper end of the upstream lifting bearing rod 21551 is provided with an upstream lifting driving device 21552; a first gap for glass fluid to pass through is formed between the upper end of the upstream base roller 2151 and the lower end of the upstream pressing and lifting roller 2155, the lower end of the upstream base roller 2151 is in contact with the upper end of the upstream sealing support roller 2154, and the lower end of the upstream sealing support roller 2154 is in contact with the bottom of the upstream bath 211; the upstream base roller 2151, the first upstream guide roller 2152, the second upstream guide roller 2153, and the upstream seal support roller 2154 are all connected to the side wall of the upstream bath 211 by bearings; the upstream pinch lift roller 2155, the upstream base roller 2151, and the upstream seal support roller 2154 divide the upstream bath 211 into a first upstream half 2111 upstream and a second upstream half 2112 downstream, and prevent the first upstream half 2111 and the second upstream half 2112 from performing too fast heat exchange; the side wall of the upstream bath 211 is formed with a first inlet 2113 communicating with the upstream supply tin bath 213, and a first outlet 2114 communicating with the upstream collection tin bath 214; the first tin inlet 2113 is provided with a first valve, and the first tin outlet 2114 is provided with a second valve; the first tin inlet 2113 and the first tin outlet 2114 are positioned in the first upstream half zone, and the first tin inlet 2113 and the first tin outlet 2114 are positioned below the liquid level of molten tin; a first heating device 21121 is arranged in the second upstream half; the temperature of the molten tin in the first upstream half 2111 is lower than the temperature of the molten tin in the second upstream half 2112, and the temperature of the molten tin in the upstream supply tin bath 213 is lower than the temperature of the molten tin in the first upstream half 2111; the level of molten tin in the first upstream half 2111 is level with the level of molten tin in the second upstream half 2112;

preferably, a downstream flattening roller group is arranged in the downstream bathroom; the downstream flattening roller group includes a downstream base roller 2251 parallel to the initial flattening roller 13, a first downstream guide roller 2252 parallel to the downstream base roller 2251 and upstream of the downstream base roller 2251, a second downstream guide roller 2253 parallel to the downstream base roller 2251 and downstream of the downstream base roller 2251, a downstream seal support roller 2254 supported in parallel just below the downstream base roller 2251, and a downstream squeeze lifter roller 2255 parallel just above the downstream base roller 2251; the downstream base roller 2251, the first downstream guide roller 2252, the second downstream guide roller 2253 and the downstream seal support roller 2254 are all below the level of the molten tin, and the highest point of the downstream extrusion lift roller 2255 is higher than the level of the molten tin, and the highest point of the downstream base roller 2251 is lower than the highest points of the first downstream guide roller 2252 and the second downstream guide roller 2253; the downstream extrusion lift roller 2255 is provided with a vertically arranged downstream lift support rod 22551 at both ends, the downstream lift support rod 22551 passes through the downstream top cover 222, the lower end of the downstream lift support rod 22551 is connected to the downstream extrusion lift roller 2255 through a bearing, and the upper end of the downstream lift support rod 22551 is provided with a downstream lift driving device 22552; a second gap through which the glass fluid passes is formed between the upper end of the downstream base roller 2251 and the lower end of the downstream pressing and lifting roller 2255, the lower end of the downstream base roller 2251 contacts the upper end of the downstream seal support roller 2254, and the lower end of the downstream seal support roller 2254 contacts the bottom of the downstream bath 221; the downstream base roller 2251, the first downstream guide roller 2252, the second downstream guide roller 2253 and the downstream seal support roller 2254 are all connected together with the side wall of the downstream bath 221 through bearings; the downstream squeeze lift roller 2255, downstream base roller 2251, and downstream seal support roller 2254 divide the downstream bath 221 into a first downstream half 2211 upstream and a second downstream half 2212 downstream, and may avoid excessive heat exchange between the first downstream half 2211 and the second downstream half 2212; the side wall of the downstream bath 221 is formed with a second tin inlet 2213 communicating with the downstream supply tin bath 223, and a second tin outlet 2214 communicating with the downstream collection tin bath 224; the second tin inlet 2213 is provided with a third valve, and the second tin outlet 2214 is provided with a fourth valve; the second tin inlet 2213 and the second tin outlet 2214 are both positioned in the first downstream half 2211, and the second tin inlet 2213 and the second tin outlet 2214 are both positioned below the liquid level of the molten tin; a second heating means 22121 is provided in the second downstream half 2212; the temperature of the molten tin in the first downstream half 2211 is lower than the temperature of the molten tin in the second downstream half 2212, the temperature of the molten tin in the downstream supply tin bath 223 is lower than the temperature of the molten tin in the second downstream half 2212, and the temperature of the molten tin in the first downstream half 2211 is lower than the temperature of the molten tin in the second upstream half 2112; the level of molten tin in the first downstream half 2211 is level with the level of molten tin in the second downstream half 2212;

preferably, the level of molten tin in the upstream bath 211 is higher than the level of molten tin in the downstream bath 221;

preferably, the upper end of the lower wall part 242 is provided with transition rollers 2421 parallel to the initial paving rollers 13; the transition roll 2421 is positioned at the upstream of the second inclined guide plate 23 and is tangent to the upper surface of the second inclined guide plate 23, and the upper end of the transition roll 2421 is flush with the liquid level of the molten tin in the upstream bath 211; the transition roller 2421 is connected with the side wall of the upstream bath 211 through a bearing;

preferably, in the process of forming the initial glass sheet by the float process, the flow path control damper 11 of the melting furnace 1 is controlled by the controller to open, the glass fluid flows out from the discharge port and flows down along the first inclined deflector 12, the initial lift driving device 132 drives the initial lift carrying rod 131 to lower the initial leveling roller 13 to press the glass fluid, so that the glass fluid is rolled out and spread out and flows along the first inclined deflector 12 to the surface of the molten tin in the first upstream half 2111 to form the floating glass ribbon 10, and as the melting furnace 1 continues to supply the glass fluid, the floating glass ribbon 10 continuously moves downstream along the molten tin, floats over the first upstream guide roller 2152 and the second upstream guide roller 2153, passes over the transition roller 2421 and flows along the second inclined deflector 23 into the first downstream half 2211, floats over the first downstream guide roller 2252 and the second downstream guide roller 2253, Until the floating glass ribbon 10 exits the second downstream half 2212;

then the controller controls the upstream lifting driving device 21552 to drive the upstream lifting bearing rod 21551 to drive the upstream extrusion lifting roller 2155 to descend, so that the floating glass ribbon 10 between the first upstream guide roller 2152 and the second upstream guide roller 2153 is pressed down and immersed into molten tin and is in contact with the upstream base roller 2151, the floating glass ribbon 10 forms a V shape under the support of the first upstream guide roller 2152 and the second upstream guide roller 2153, the controller controls the distance between the upstream extrusion lifting roller 2155 and the upstream base roller 2151, and the upstream extrusion lifting roller 2155 and the upstream base roller 2151 are used for extruding and flattening the floating glass ribbon 10; the controller controls the downstream lift drive 22552 to drive the downstream lift carrier 22551 to lower the downstream press lift roller 2255 to lower the floating glass ribbon 10 between the first downstream guide roller 2252 and the second downstream guide roller 2253 down into the molten tin and into contact with the downstream base roller 2251, so that the floating glass ribbon 10 is formed into a V-shape under the support of the first downstream guide roller 2252 and the second downstream guide roller 2253, the controller controls the distance between the downstream press lift roller 2255 and the downstream base roller 2251, and the downstream press lift roller 2255 and the downstream base roller 2251 are used to squeeze and flatten the floating glass ribbon 10 again;

then, the controller is used to control the flow of the first valve, the second valve, the third valve and the fourth valve, so that the upstream supply tin bath 213 continuously supplies molten tin with lower temperature to the first upstream half area, the molten tin with higher temperature in the first upstream half area is discharged to the upstream collection tin bath 214, the downstream supply tin bath 223 continuously supplies molten tin with lower temperature to the first downstream half area, the molten tin with higher temperature in the first downstream half area is discharged to the downstream collection tin bath 224, the temperature of the molten tin in the first upstream half area 2111 is always lower than that of the molten tin in the second upstream half area 2112, and the temperature of the molten tin in the first downstream half area 2211 is always lower than that of the molten tin in the second downstream half area 2212;

(3) annealing the initial glass plate by using an annealing chamber 3 to form a finished glass plate;

In the practical working process of the invention, a smelting furnace 1 smelts glass raw materials to form glass fluid, a flow channel control gate plate 11 of the smelting furnace 1 is controlled to be opened by a controller, the glass fluid (higher than 1100 ℃) flows out of a discharge port and flows downwards along a first inclined guide plate 12, an initial lifting driving device 132 drives an initial lifting bearing rod 131 to drive an initial leveling roller 13 to descend to press the glass fluid, so that the glass fluid is rolled and paved to be thin (similar to a rolling pin) and flows to the liquid level of molten tin in a first upstream half area 2111 along the first inclined guide plate 12 to form a floating glass ribbon 10, the floating glass ribbon 10 is cooled on the molten tin to form glass viscous flow which is high in viscosity and difficult to tear due to the lower temperature of the molten tin and the reduction of the fluidity of the glass fluid, and the floating glass ribbon 10 continuously moves downwards along the molten tin as the smelting furnace 1 continues to supply the glass fluid, The glass flows over the first upstream guide roll 2152 and the second upstream guide roll 2153, over the transition roll 2421, along the second angled deflector 23, into the second downstream half 2212, over the first downstream guide roll 2252 and the second downstream guide roll 2253 until the floating ribbon 10 exits the second downstream half 2212, and may then proceed to the annealing process, but this portion of glass is waste only, is produced for the purpose of forming a continuous ribbon of glass, and should not be the final product of the invention. Then the controller controls the upstream lifting driving device 21552 to drive the upstream lifting carrying rod 21551 to drive the upstream pressing lifting roller 2155 to descend, so that the floating glass ribbon 10 between the first upstream guide roller 2152 and the second upstream guide roller 2153 is pressed down and immersed into the molten tin and contacts with the upstream base roller 2151, so that the floating glass ribbon 10 forms a V shape under the support of the first upstream guide roller 2152 and the second upstream guide roller 2153, the controller controls the distance between the upstream pressing lifting roller 2155 and the upstream base roller 2151, the floating glass ribbon 10 is flattened by the corresponding thickness by the upstream pressing lifting roller 2155 and the upstream base roller 2151, the molten tin generates upward buoyancy to the floating glass ribbon 10 to be uniformly stretched and thinned, the floating expansion time is reduced, the slow expansion defect of complete utilization of floating is avoided, the unfolding speed is improved, and the floating glass ribbon 10 is in viscous flow state, can not be broken by pulling; the defects such as concave-convex on the upper surface and the lower surface of the floating glass ribbon 10 can be simultaneously flattened and uniformly melted, and the defects such as scratches, bubbles and the like can not occur; the stress difference caused by the temperature difference generated on the upper surface and the lower surface of the floating glass ribbon 10 can be avoided, the internal stress is released on the two sides at the same time, and the deformation and the like are avoided; the internal stresses are relieved and flow enhanced as the floating ribbon 10 enters the molten tin bath in the second, higher temperature upstream half 2112, and the floating ribbon 10 continues to float and progressively thins out at the level of the molten tin bath in the second, upstream half 2112 as it passes around the second, upstream guide roll 2153. Meanwhile, the controller controls the downstream lifting and lowering driving device 22552 to drive the downstream lifting and lowering roller 22551 to lower the floating glass ribbon 10 between the first downstream guide roller 2252 and the second downstream guide roller 2253, to press down the floating glass ribbon 10 into the molten tin and contact the downstream base roller 2251, so that the floating glass ribbon 10 is formed into a V-shape under the support of the first downstream guide roller 2252 and the second downstream guide roller 2253, the controller controls the distance between the downstream lifting and lowering roller 2255 and the downstream base roller 2251, and the floating glass ribbon 10 is again subjected to the corresponding thickness flattening by the downstream lifting and lowering roller 2255 and the downstream base roller 2251, which further thins the floating glass ribbon 10, so that the molten tin generates an upward buoyancy to the floating glass ribbon 10 for uniform drawing, thereby reducing the floating and expanding time and avoiding the slow expanding defect of complete utilization of floating, the unfolding speed is increased, and the floating glass ribbon 10 is in a viscous flow state and cannot be broken by pulling; the defects such as concave-convex on the upper surface and the lower surface of the floating glass ribbon 10 can be simultaneously flattened and uniformly melted, and the defects such as scratches, bubbles and the like can not occur; the stress difference caused by the temperature difference generated on the upper surface and the lower surface of the floating glass ribbon 10 can be avoided, the internal stress is released on the two sides at the same time, and the deformation and the like are avoided; the floating ribbon 10, after entering the higher temperature molten tin in the second downstream half 2212, releases internal stresses and increases flow, and after the floating ribbon 10 passes around the second downstream guide roll 2253, it continues to float and gradually thins at the level of the molten tin in the second downstream half 2212 to the desired ultra-thin thickness. The controller then controls the flow rates of the first, second, third and fourth valves such that the upstream supply tin bath 213 continuously supplies molten tin of a lower temperature to the first upstream half 2111, the molten tin of a higher temperature in the first upstream half 2111 is discharged into the upstream collection tin bath 214, the downstream supply tin bath 223 continuously supplies molten tin of a lower temperature to the first downstream half 2211, and the molten tin of a higher temperature in the first downstream half 2211 is discharged into the downstream collection tin bath 224, keeping the temperature of the molten tin in the first upstream half 2111 always lower than the temperature of the molten tin in the second upstream half 2112 and the temperature of the molten tin in the first downstream half 2211 always lower than the temperature of the molten tin in the second downstream half 2212. Simultaneously, the molten tin in the second upstream half 2112 is heated by the first heating device 21121, and the molten tin in the second upstream half 2112 is kept in a higher temperature range; the molten tin in the second downstream half 2212 is heated by the second heating device 22121 to maintain the molten tin in the second downstream half 2212 within a higher temperature range. Then annealing the initial glass plate by using an annealing chamber 3 to form a finished glass plate; and then, laminating the finished product glass plate to form the finished product photovoltaic glass plate. The ultrathin photovoltaic glass with the required thickness can be obtained after two times of staged extrusion, cold and hot alternate soaking and floating expansion, and the staged progressive extrusion and the cold and hot alternate soaking can generate a flexible effect on the floating glass ribbon 10, so that the floating glass ribbon 10 is not easy to break, and the continuity is stronger.

Preferably, the invention is more suitable for producing glass with the thickness of 0.5-1mm, and can better embody the effect of the invention.

Preferably, protective gas is introduced into the upstream bathroom and the downstream bathroom, the protective gas is a mixed gas of nitrogen and hydrogen, wherein the volume ratio of the nitrogen is 90-95%, and the volume ratio of the hydrogen is 5-10%.

Preferably, in order to avoid the glass fluid from adhering to the first inclined baffle 12 under the pressure of the initial flattening roller 13 and affecting the flow, and to enhance the flow performance of the glass fluid, a plurality of heating parts are arranged below the first inclined baffle 12 to heat the first inclined baffle 12, so as to increase the temperature of the glass fluid on the first inclined baffle 12.

Preferably, a through hole for the glass ribbon to flow out is formed between the downstream bathroom and the annealing chamber 3, and a transition roller 2421 for performing transition guiding on the glass ribbon is arranged at the through hole; a plurality of annealing guide rolls for receiving the glass ribbon are provided in the annealing chamber 3.

Preferably, in step (2), the height of the first tin inlet 2113 is lower than that of the first tin outlet 2114, and the height of the second tin inlet 2213 is lower than that of the second tin outlet 2214. In the actual working process, because the molten tin liquid at higher temperature is easier to move upwards, the arrangement of the step is more beneficial to discharging the molten tin liquid at higher temperature from the first tin outlet 2114 and the second tin outlet 2214, and the molten tin liquid at lower temperature is uniformly and continuously supplemented, so that the temperature of the molten tin liquid in the first upstream half 2111 and the first downstream half 2211 is always maintained in a stable lower temperature range.

Preferably, in step (2), the temperature of the molten tin bath in the second upstream half 2112, the second downstream half 2212, the first upstream half 2111 and the first downstream half 2211 is set from high to low. This step also becomes wavy and gradually cools and hardens as the float glass ribbon 10 becomes gradually thinner, and finally forms a glass sheet.

Preferably, in step (2), the molten tin bath in the second upstream half 2112 has a temperature of 1047.5-1065 ℃, which is more favorable for raising the temperature of the thicker floating glass ribbon 10 to improve the fluidity, and thus for flattening; the molten tin bath in the second downstream half 2212 is at a temperature of 1030-1047.5 deg.C, which is more conducive to raising the temperature of the thinner floating glass ribbon 10 to improve the fluidity and thus to flattening; the molten tin in the first upstream half 2111 is at a temperature of 1012.5 to 1030 ℃, and the molten tin in the first upstream half 2111 at this temperature is more favorable for reducing the temperature and the fluidity of the thicker floating glass ribbon 10, so that the viscosity is enhanced and the thinning and flattening are favorable; the molten tin in the first downstream half 2211 is at a temperature of 996-1012.5 ℃, and the molten tin in the first downstream half 2211 at the temperature is more beneficial to cooling and reducing the fluidity of the thinner floating glass ribbon 10, so that the viscosity is enhanced and the thinning and flattening are facilitated; the molten tin in the upstream supply tin bath 213 and the downstream supply tin bath 223 has a temperature of less than 996 ℃, and the molten tin at this temperature can effectively dilute and cool the molten tin in the first upstream half 2111 and the first downstream half 2211 on the basis of ensuring higher fluidity.

Preferably, in step (2), a first temperature detection device is disposed in the first upstream half 2111, a second temperature detection device is disposed in the second upstream half 2112, a third temperature detection device is disposed in the first downstream half 2211, and a fourth temperature detection device is disposed in the second downstream half 2212. Each temperature detection device detects the temperature of the corresponding half area in real time, transmits the temperature signal of the molten tin liquid of the corresponding half area to the controller, and the controller controls the corresponding heating device or the valve to be opened or closed.

Preferably, in step (2), the upstream top cover 212 is formed with an upstream sealing slide hole in sealing contact with the initial elevating carrier bar 131 and the upstream elevating carrier bar 21551, and the downstream top cover 222 is formed with a downstream sealing slide hole in sealing contact with the downstream elevating carrier bar 22551. The upstream sealing sliding hole seals the upstream elevating and lowering

rod

131 and 21551 in the initial stage while ensuring smooth up and down movement, and the downstream sealing sliding hole seals the downstream elevating and lowering rod 22551 in the initial stage while ensuring smooth up and down movement, thereby preventing loss of the internal protective gas and temperature. Specifically, sealing gaskets made of high-temperature-resistant flexible materials such as silicon carbide fibers, silicon nitride fibers or ceramic fiber cotton are sleeved on the corresponding lifting bearing rods for sealing.

Preferably, in step (2), an initial connecting cross bar 133 is connected between the upper ends of the two initial lifting/lowering support bars 131, an upstream connecting cross bar 21553 is connected between the upper ends of the two upstream lifting/lowering support bars 21551, and a downstream connecting cross bar 22553 is connected between the upper ends of the two downstream lifting/lowering support bars 22551.

Preferably, in step (2), a fixed substrate is further included, which is disposed above the upstream cap 212 and the downstream cap 222; the initial lifting driving device 132 includes a first vertical screw 1321 connected to the initial connecting cross bar 133, and a first motor 1322 disposed on the fixed substrate and driving the first vertical screw 1321 to rotate; the initial connecting rail 133 is formed with a first screw hole engaged with the first vertical screw 1321; the upstream lifting driving device 21552 comprises a second vertical screw 215521 connected with the upstream connecting cross bar 21553, and a second motor 215522 arranged on the fixed base plate and driving the second vertical screw 215521 to rotate; the upstream connecting cross bar 21553 is formed with a second screw hole that mates with the second vertical screw 215521; the downstream lifting and lowering driving device 22552 includes a third vertical screw 225521 connected to the downstream connecting cross bar 22553, and a third motor 225522 provided on the fixed base plate and driving the third vertical screw 225521 to rotate; downstream connecting cross bar 22553 is formed with a third threaded bore that mates with third vertical screw 225521. In the actual working process, the controller controls the first motor 1322 to drive the first vertical screw 1321 to rotate, and the first vertical screw 1321 drives the initial connecting cross rod 133 to drive the two initial lifting bearing rods 131 to lift through the first screw; the controller controls the second motor 215522 to drive the second vertical screw 215521 to rotate, and the second vertical screw 215521 drives the upstream connecting cross bar 21553 through the second screw hole to drive the two upstream lifting bearing rods 21551 to lift; the controller controls the third motor 225522 to drive the third vertical screw 225521 to rotate, and the third vertical screw 225521 drives the downstream connecting rod 22553 through the third screw hole to drive the two downstream lifting/lowering support rods 22551 to lift or lower.

Preferably, in the step (2), the upstream seal supporting roller 2154 includes a first roller main body and a first high-temperature-resistant seal layer wrapped around a circumferential surface of the first roller main body; the downstream seal support roller 2254 includes a second roller main body and a second high-temperature-resistant seal layer covering the circumferential surface of the second roller main body. The specific structure may be that the first high temperature-resistant sealing layer and the second high temperature-resistant sealing layer are flexible layer structures made of silicon carbide fibers, silicon nitride fibers or ceramic fiber cotton, and can be sealed in a flexible contact manner with the contact position, so that excessively fast circulation and heat exchange between the first upstream half-area 2111 and the second upstream half-area 2112 are avoided, and excessively fast circulation and heat exchange between the first downstream half-area 2211 and the second downstream half-area 2212 are avoided.

Since the floating glass ribbon 10 has a large thickness in the upstream bath 211 and can withstand a large pulling force due to the buoyancy of the molten tin, it is preferable that the upstream squeeze lifter 2155 is protruded 0 to 0.4m below the surface of the molten tin (i.e., the depth of the floating glass ribbon 10 immersed in the molten tin is 0 to 0.4m, and if the depth is increased, the floating glass ribbon 10 is torn apart unless the viscosity of the glass ribbon is increased, which is not favorable for the stretching and leveling of the glass ribbon and affects the uniformity of the glass thickness) on the basis of ensuring the effect of the molten tin on the immersed floating glass ribbon 10, and the floating glass ribbon 10 can be strongly affected by the molten tin, and the glass can be rapidly stretched and uniformly formed in a thickness and a flat surface. However, since the floating glass ribbon 10 has a small thickness in the downstream bath 221 and can withstand a small pulling force due to the buoyancy of the molten tin, it is preferable that the downstream squeeze rolls 2255 can be extended to 0 to 0.15m below the surface of the molten tin (i.e., the floating glass ribbon 10 is immersed to a depth of 0 to 0.15m in the molten tin, and if the depth is increased, the floating glass ribbon 10 will be torn apart unless the viscosity of the glass ribbon is increased, which is not favorable for the stretching and leveling of the glass ribbon and affects the uniformity of the glass thickness) on the basis of ensuring the effect of the molten tin on the immersed floating glass ribbon 10, and the floating glass ribbon 10 can be strongly affected by the molten tin, and the glass can be rapidly stretched and has a uniform thickness and a smooth surface.

The product form of the present invention is not limited to the embodiments and examples shown in the present application, and any suitable changes or modifications of the similar ideas should be made without departing from the patent scope of the present invention.

Claims

1. The production process of the ultrathin photovoltaic glass is characterized by comprising the following steps of:

2. The process for producing an ultra-thin photovoltaic glass according to claim 1, wherein: in the step (2), the height of the first tin inlet is lower than that of the first tin outlet, and the height of the second tin inlet is lower than that of the second tin outlet.

3. The process for producing an ultra-thin photovoltaic glass according to claim 2, wherein: in the step (2), the temperatures of the molten tin in the second upstream half-zone, the second downstream half-zone, the first upstream half-zone and the first downstream half-zone are set from high to low.

4. The process for producing an ultra-thin photovoltaic glass according to claim 3, wherein: in step (2), the temperature of the molten tin bath in the second upstream half-zone is 1047.5-1065 ℃, the temperature of the molten tin bath in the second downstream half-zone is 1030-1047.5 ℃, the temperature of the molten tin bath in the first upstream half-zone is 1012.5-1030 ℃, and the temperature of the molten tin bath in the first downstream half-zone is 996-1012.5 ℃; the molten tin bath in the upstream and downstream supply baths is at a temperature of less than 996 ℃.

5. The process for producing an ultra-thin photovoltaic glass according to claim 4, wherein: in step (2), a first temperature detection device is arranged in the first upstream half zone, a second temperature detection device is arranged in the second upstream half zone, a third temperature detection device is arranged in the first downstream half zone, and a fourth temperature detection device is arranged in the second downstream half zone.

6. The process for producing an ultra-thin photovoltaic glass according to claim 5, wherein: in the step (2), the upstream top cover is formed with an upstream sealing sliding hole in sealing contact with the initial elevating carrier bar and the upstream elevating carrier bar, and the downstream top cover is formed with a downstream sealing sliding hole in sealing contact with the downstream elevating carrier bar.

7. The process for producing an ultra-thin photovoltaic glass according to claim 6, wherein: in the step (2), an initial connecting cross rod is connected between the upper ends of the two initial lifting bearing rods, an upstream connecting cross rod is connected between the upper ends of the two upstream lifting bearing rods, and a downstream connecting cross rod is connected between the upper ends of the two downstream lifting bearing rods.

8. The process for producing an ultra-thin photovoltaic glass according to claim 7, wherein: in the step (2), the upstream sealing and supporting roller comprises a first roller main body and a first high-temperature-resistant sealing layer coated on the peripheral surface of the first roller main body; the downstream sealing support roller comprises a second roller main body and a second high-temperature-resistant sealing layer coated on the circumferential surface of the second roller main body.