Horizontal secondary drawing apparatus and method for ultra-thin flexible glass

Abstract

The present invention discloses a horizontal secondary stretching device and method for ultra-thin flexible glass, which belongs to the technical field of flexible glass production. The horizontal secondary stretching device for ultra-thin flexible glass includes an air flotation device, a heating unit, a cooling mechanism, and a supply unit, a welding unit, a preheating unit, a transverse stretching unit, a longitudinal stretching unit, an annealing unit, and a winding and packaging unit, which are connected in sequence. The air flotation device can adjust the pressure difference between the top and bottom of the glass sheet, solve the problem of the glass sheet bending downward during the transverse conveying process, ensure the quality of heating and annealing, and the welding unit butt-welds the glass sheet during conveying to realize continuous supply. The device is designed to have a multi-layer structure, includes a heat equalizing plate and an externally installed heating and cooling unit, and provides a good temperature gradient field during the heating, cooling and annealing process of the glass sheet.

Description

[Technical Field]

[0001] The present invention relates to the technical field of flexible glass manufacturing, and more particularly to a horizontal secondary drawing apparatus and method for ultra-thin flexible glass. [Background technology]

[0002] Ultra-thin flexible glass refers to glass with a thickness of less than 0.1 mm and a certain degree of bending. It has the advantages of good flatness, flexibility, optical performance, heat resistance, smooth surface, stable chemical properties, etc., and is therefore widely used in the field of electronic products.

[0003] Currently, direct methods for producing ultra-thin flexible glass include the float process, the overflow process, and the slit downdraw process. While the production process principles for ultra-thin glass using the float process are essentially the same as those for conventional float processes, the ultra-thin float process places greater demands on process management and equipment, making production more difficult. The greatest advantage of the overflow downdraw process is that the glass has good surface quality. However, the process management for ultra-thin glass production is extremely difficult and the technical requirements are high, making it difficult to industrialize. When producing flexible glass using the slit downdraw process, the surface of the flexible glass comes into contact with the slit, which affects the surface quality of the glass, affecting the shape and material of the slit. The resulting flexible glass requires secondary polishing, resulting in complex processes, high costs, and low production capacity. Indirect methods for producing ultra-thin flexible glass include chemical thinning and secondary drawing. A common problem with these two methods is that they are limited to small batch production and cannot meet market demand. Furthermore, flexible glass substrates produced using the chemical thinning process have surface defects such as scratches and dents, requiring polishing. The surface of flexible glass is very difficult to polish, which makes the glass prone to breakage and reduces yield.The current secondary drawing method involves heating a glass preform in a heating furnace to a softening temperature, drawing the flexible glass, and then annealing it.However, this method has the disadvantages of not being able to produce continuously, requiring high factory equipment height, low production volume, and difficult control.In addition, the flexible glass produced in the heating furnace will bend downward due to gravity, making it difficult to ensure the quality of the produced flexible glass. Summary of the Invention [Problem to be solved by the invention]

[0004] In order to overcome the above-mentioned drawbacks of the prior art, an object of the present invention is to provide an apparatus and method for horizontal secondary drawing of ultra-thin flexible glass, which solves the problem that the conventional apparatus and method cannot realize continuous production and cannot guarantee product quality. [Means for solving the problem]

[0005] To achieve the above objectives, the present invention employs the following technical solutions:

[0006] The present disclosure discloses a horizontal secondary stretching apparatus for ultra-thin flexible glass, which includes a supply unit, a welding unit, a preheating unit, a transverse stretching unit, a longitudinal stretching unit, an annealing unit, and a roll-up packaging unit connected in sequence, wherein the supply unit, the welding unit, the preheating unit, the transverse stretching unit, the longitudinal stretching unit, the annealing unit, and the roll-up packaging unit are all provided with air flotation devices and rollers, the air flotation devices are installed on both the top and bottom of the original glass sheet and are used to maintain a pressure difference between the top and bottom of the original glass sheet, and the rollers are installed on both sides of the width of the original glass sheet and are used to clamp and transport the original glass sheet, the preheating unit, the transverse stretching unit, the longitudinal stretching unit, and the annealing unit are all provided with heating units, the heating unit is installed between the air flotation devices and the original glass sheet, and the longitudinal stretching unit and the annealing unit are provided with cooling mechanisms, the cooling mechanism is installed between the heating unit and the original glass sheet.

[0007] Preferably, the air flotation device includes an intake pipe, an exhaust pipe, and an opening control valve, the intake pipes being evenly arranged at the bottom of the supply unit, welding unit, preheating unit, transverse stretching unit, longitudinal stretching unit, annealing unit, and winding and packaging unit, the exhaust pipes being evenly arranged at the top of the preheating unit, transverse stretching unit, longitudinal stretching unit, and annealing unit, and the opening control valve being installed outside the exhaust pipe to adjust the exhaust volume of the exhaust pipe.

[0008] Preferably, the gas temperature within the air flotation device is maintained to match the temperatures of the feeding unit, welding unit, preheating unit, transverse stretching unit, longitudinal stretching unit, annealing unit and winding and packaging unit.

[0009] Preferably, the heating unit includes a heat-insulating layer, a heating device and a heat-equalizing plate are installed inside the heat-insulating layer, the heat-equalizing plate is installed symmetrically on both sides of the glass original plate, the heat-equalizing plate has heat-equalizing plate holes, the heating device is installed outside the heat-equalizing plate, and the cooling mechanism is installed between the heat-equalizing plate and the heating device.

[0010] More preferably, a temperature sensor is embedded in the heat insulating layer, and the temperature sensor penetrates the heat insulating layer and the heat equalizing plate to approach the glass substrate.

[0011] Preferably, the heat spreader plate is made of silicon carbide material and the heating device is made of iron chromium aluminum or silicon molybdenum material.

[0012] Preferably, the supply unit, the welding unit and the preheating unit are all provided with clamping and conveying rollers, the transverse stretching and spreading unit is provided with transverse clamping and spreading rollers, the longitudinal stretching and stretching unit is provided with stretching and clamping rollers I, the annealing unit is provided with stretching and clamping rollers II, and the winding and packaging unit is provided with a rotatable winding mechanism.

[0013] More preferably, the peripheral speed ratio of the nip and conveyance roller, the stretch nip roller I, and the stretch nip roller II is 1:n:n JPEG0007734767000001.jpg1447.

[0014] Preferably, a laser welder is installed in the welding unit, which moves back and forth along the width direction of the glass original sheets, and the laser welder can track the positions of the two front and rear glass original sheets to complete the welding of the two glass original sheets.

[0015] The present invention further discloses a drawing method for a horizontal secondary drawing apparatus for ultra-thin flexible glass, including starting the horizontal secondary drawing apparatus for ultra-thin flexible glass, transporting a glass original sheet into a fusing unit via a supply unit, completing the welding of the front and rear glass original sheets in the fusing unit, then causing the glass original sheet to enter a preheating unit of a drawing furnace for preheating, then entering a transverse stretching unit for transverse stretching, then entering a longitudinal tensioning unit for cooling and longitudinal tensioning, then entering an annealing unit for reducing the temperature, and finally causing the glass original sheet to enter a winding and packaging unit for product packaging. [Effects of the Invention]

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] In the horizontal secondary stretching apparatus for ultra-thin flexible glass according to the present invention, the air floating device is installed to maintain the environmental pressure difference between the upper and lower sides of the glass sheet, and P 下 >P 上This reduces the tendency of the glass sheet to bend downward due to gravity during the transverse transport process, ensuring that the glass sheet always maintains a stable shape during the stretching transport process, and strengthening the control of thickness, warpage, and stress during the glass sheet stretching process. The transverse stretching unit and the longitudinal tension stretching unit are used to perform cross-stretching, preventing shrinkage of the glass sheet. The combination of a heating unit and a cooling mechanism allows for effective temperature control. The equipment is divided into seven functional zones: feeding, welding, preheating, pulling, stretching, annealing, and winding. Through transmission and secondary stretching, the glass substrate produced by the overflow method is passed through the feeding zone, preheated to near its softening point by a laser welder, effectively reduced in width by a horizontal clamping stretching mechanism, and simultaneously stretched lengthwise by a vertical stretching mechanism. Finally, through annealing and winding, continuous production of ultra-thin flexible glass is realized. The produced ultra-thin flexible glass has a relatively high surface quality and does not require secondary polishing. This solves the technical difficulties of continuous production and small size that exist in traditional secondary stretching, while maintaining the surface quality of products produced by the overflow method.

[0018] Furthermore, the laser welding machine follows the horizontal conveyor and realizes reciprocating motion, realizing continuous welding and production.

[0019] Furthermore, the rollers use a turbine worm mechanism to laterally hold and tensilely stretch the glass sheet in the width direction, thereby suppressing shrinkage of the glass sheet.

[0020] Furthermore, flexible glass of different thicknesses can be achieved by stretching at different speed ratios in the longitudinal direction. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is an overall schematic diagram of an air levitation device of the present invention. [Figure 2] 1 is a plan view of a horizontal secondary drawing apparatus for ultra-thin flexible glass of the present invention. FIG. [Figure 3] FIG. 1 is a front view of a horizontal secondary drawing apparatus for ultra-thin flexible glass of the present invention. [Figure 4] FIG. 4 is a cross-sectional view of a portion DD in FIG. [Figure 5] FIG. 4 is a cross-sectional view of the EE portion in FIG. [Figure 6] 1 is a schematic diagram of the spreading and stretching principle and method of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] In order to help those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention, obviously, the described embodiments are only some embodiments of the present invention, not all embodiments, and all other embodiments that those skilled in the art can obtain without creative efforts based on the embodiments of the present invention shall fall within the protection scope of the present invention.

[0023] It should be noted that the terms "first," "second," etc. in the present specification and claims and the drawings are used to distinguish between similar objects and are not necessarily used to describe a particular order or chronology. It should be understood that such terms may be interchanged where appropriate, such that the embodiments of the present invention described herein may be practiced in orders other than those illustrated or described herein. Furthermore, the terms "comprises" and "having" and any variations thereof are intended to cover non-exclusively; for example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the explicitly recited steps or units, but may include other steps or units that are not explicitly recited or inherent in the process, method, product, or apparatus.

[0024] The present invention will now be described in more detail with reference to the drawings.

[0025] In the present invention, the glass substrate A2 is a substrate glass produced by the overflow method, and its dimensions include, but are not limited to, 1800 × 1500 × (0.4-0.5) mm. When using this apparatus, the glass substrate A2 passes horizontally through the center of the entire apparatus, and the secondary elongation of the glass substrate A2 is completed.

[0026] As shown in Figures 1 to 3, the horizontal secondary stretching apparatus for ultra-thin flexible glass provided by the present invention includes an air flotation device, a heating unit, a cooling mechanism, and a supply unit A, a welding unit B, a preheating unit C, a transverse stretching / spreading unit D, a longitudinal tensile / stretching unit E, an annealing unit F, and a winding / packaging unit G connected in sequence.

[0027] The air flotation device is used to maintain a pressure difference between the top and bottom of the glass substrate. As shown in Figure 1, the air flotation device includes a plurality of intake pipes L4, aperture control valves L51, and exhaust pipes L5. The intake pipes L4 are evenly arranged at the bottom of each zone (i.e., supply unit A, welding unit B, preheating unit C, transverse stretching / spreading unit D, longitudinal stretching / spreading unit E, annealing unit F, and winding / packaging unit G). The exhaust pipes L5 are evenly arranged at the top of preheating unit C, transverse stretching / spreading unit D, longitudinal stretching / spreading unit E, and annealing unit F. The aperture control valve L51 is installed outside the exhaust pipe L5, which is connected to a blower to exhaust air. The amount of exhaust air can be controlled by the aperture control valve L51. The air entering the air flotation device is purified air. After the temperature of each zone is preheated, the gas introduced through the intake pipe L4 in the supply unit A, welding unit B, and winding and packaging unit G reduces the tendency of the glass sheet A2 to sag in an arc shape. In the preheating unit C, transverse stretching unit D, longitudinal stretching unit E, and annealing unit F, the gas flow rate of the intake pipe L4 and the flow rate opening of the exhaust pipe L5 are coordinated to adjust the exhaust opening control valve L51, so that the pressure difference between the upper and lower parts of the glass sheet A2 is maintained, i.e., P-bottom > P-top, thereby reducing the tendency of the glass sheet A2 to sag in an arc shape (see the dashed lines in Figures 4 and 5).

[0028] The supply unit A, welding unit B, and preheating unit C each have multiple sets of clamping and conveying rollers A1. The clamping and conveying rollers A1 are symmetrically arranged across the width of the elongating machine to clamp and convey the glass substrate A2 at a speed V1. The supply unit A conveys and supplies the glass substrate A2 held by the conveying clamping rollers IA1 along its length. The welding unit B welds the glass substrate A2. The welding unit B further includes a laser welder B2 that moves back and forth across the width of the elongating machine. The laser welder B2 is fixed above the glass substrate A2 by a bracket attached to the outside of the furnace entrance, allowing it to move back and forth across the width of the glass substrate A2. The laser welder B2 tracks the positions of the two glass substrates A2 and completes the welding of the two glass substrates A2 (see Figure 2 for the welding line B1 between the two glass substrates A2 after welding). The preheating unit C is used to preheat the glass substrate A2.

[0029] The heating units are used to heat the glass blank A2. The heating units are installed in the preheating unit C, the transverse stretching unit D, the longitudinal stretching unit E, and the annealing unit F. As shown in Figures 4 and 5, the heating units use a top and bottom heating method and include a heat insulation layer L1, which can ensure the temperature of the top and bottom of the glass blank A2. Heating device T2 and heat equalizing plates are installed inside the heat insulation layer L1. The heat equalizing plates are made of silicon carbide and installed horizontally symmetrically on both sides of the glass substrate A2. The heat equalizing plates consist of upper and lower heat equalizing plates L3 and L2, which together form a relatively sealed heat equalizing space. The upper heat equalizing plate L3 has evenly spaced upper heat equalizing plate vents L31, and the lower heat equalizing plate L2 has evenly spaced lower heat equalizing plate vents L21. Heating device T2 is installed horizontally on the outside of the heat equalizing plate and is made of iron chromium aluminum or silicon molybdenum. Temperature sensor T1 is embedded in the heat insulation layer L1. It penetrates the heat insulation layer L1 and the heat equalizing plate and is spaced a certain distance from the glass substrate A2. The temperature sensor T1 is symmetrically installed at the top and bottom of the heat insulation layer L1. Furnace door mechanisms L6 are installed on both sides of the heat-retaining layer L1, and zone-dividing partition plates L7 are installed vertically at intervals within the heat-retaining layer L1. The furnace door mechanisms L6 and the zone-dividing partition plates L7 make the spaces of each zone relatively independent. The furnace door mechanisms L6 and the zone-dividing partition plates L7 inside the furnace work in conjunction with the intake section installed below the glass sheet A2 and the exhaust section installed at the top, so that during the conveying process, the pressure difference below the glass sheet in the furnace is greater than that above, maintaining the glass sheet in a horizontal position and further suppressing downward bending of the glass sheet A2 during horizontal conveying and stretching. At the same time, the upper and lower surfaces of the glass sheet A2 do not come into contact with other parts of the device during the conveying process, ensuring the surface quality of the glass sheet A2. The intake pipe L4 of the air flotation device penetrates the bottom of the heat-retaining layer L1, and the clean air introduced by the intake pipe L4 passes through the lower heat-retaining plate holes L21 into the space below the glass original plate A2. The exhaust pipe L5 penetrates the top of the heat-retaining layer L1, and the gas in the space above the glass original plate A2 is exhausted through the upper heat-retaining plate holes L31 and the exhaust pipe L5.When using this apparatus, the heating device T2 is controlled in combination with the temperature detector T1 to control the temperature in the preheating unit C to be above the softening point, preferably 1000°C to 950°C, the temperature in the transverse stretching unit D to be above the annealing point, preferably 950°C to 900°C, the temperature in the longitudinal tensile stretching unit E to be 900°C to 750°C, the temperature in the annealing unit F to be 750°C to 600°C, and the temperature at the annealing outlet to be 300°C to 250°C.

[0030] The transverse stretching unit D is used to stretch the glass substrate A2 in the transverse direction. It includes transverse clamping and spreading rollers D1, which are made of high-temperature resistant metal and have a surface pattern to increase friction. When the transverse clamping and spreading rollers D1 clamp the glass substrate A2, the surface pattern is interlocked with the softened glass substrate A2. The transverse clamping and spreading rollers D1 are attached to both sides of the worm of the turbine worm mechanism. The turbine rotation shaft D2 protrudes from the furnace body. The external turbine drive shaft rotates the transverse clamping and spreading rollers D1 attached to both sides of the worm of the turbine worm mechanism, i.e., perpendicular to the conveying direction. The transverse clamping and spreading rollers D1 prevent the glass substrate A2 from shrinking in the width direction and achieve transverse spreading of the glass. The longitudinal stretching unit E is used to cool the glass substrate A2 and longitudinally stretch it. The longitudinal stretching unit E includes stretching and pinching rollers IE1. When the thickness of the glass sheet A2 is 0.5 mm, the stretching and pinching rollers IE1 can stretch the glass sheet A2 to a thickness of less than 0.1 mm, resulting in the production of flexible glass. The annealing unit F is used to reduce the temperature of the glass sheet A2. The annealing unit F includes stretching and pinching rollers IIF1. The winding and packaging unit G is used to package the product. The winding and packaging unit G includes a rotatable winding mechanism G1, which is installed outside the annealing unit F and controlled by an independent rotation mechanism. When the glass sheet enters the winding and packaging unit G, the winding mechanism G1 can wind up the glass sheet A2, ensuring continuous production. The transverse clamping and spreading rollers D1, stretching clamping rollers IE1 and stretching clamping rollers IIF1 are all installed symmetrically in multiple sets along the width direction of the stretching device and are used to clamp the glass substrate A2 and transport it at a speed V2, with a peripheral speed ratio of V2 to V1:1, where h1 is the thickness of the glass substrate A2 and h2 is the thickness of the flexible glass after stretching, and the preferred peripheral speed ratio is 5:1. The stretching clamping rollers IE1 and IIF1 are both made of asbestos material and generate very high friction with the glass substrate A2.The clamping and conveying roller A1 is fixed to the outer periphery of the supply unit A and the welding unit B by an independent support mechanism and directly clamps the glass. The transverse clamping and spreading roller D1, stretching clamping roller IE1 and stretching clamping roller IIF1 are all respectively fixed to the interiors of the preheating unit C, transverse stretching and spreading unit D, longitudinal stretching and stretching unit E and annealing unit F by independent support mechanisms and extend into the furnace through corresponding mounting holes opened in the sides of the preheating unit C, transverse stretching and spreading unit D, longitudinal stretching and stretching unit E and annealing unit F to clamp the glass.

[0031] The cooling mechanism is used to reduce the temperature of the glass substrate A2. The cooling mechanism is installed inside the longitudinal stretching unit E and the annealing unit F. The cooling medium of the cooling mechanism is cooling water or cooling air. The cooling mechanism is an upper cooling mechanism L. 上 and lower cooling mechanism L 下 Including upper cooling mechanism L 上 is installed between the upper heat equalizer L3 and the heating device T2, and the lower cooling mechanism L 下 is installed between the lower heat equalizer plate L2 and the heating device T2.

[0032] The principle of horizontal secondary stretching for ultra-thin flexible glass provided by the present invention is as shown in FIG. 6, where the width of the glass substrate A2 is W1, the clamping and conveying speed is V1, the glass substrate A2 is preheated by the preheating unit C and then enters the transverse stretching unit D, where it is clamped by the transverse clamping and spreading rollers D1, and an outward force N is applied in the width direction, and the inward contraction force of the glass substrate A2 is f1, where N>f1, and the longitudinal stretching speed is V2, From the transverse stretching unit D, the glass substrate A2 enters the longitudinal stretching unit E. Through the clamping of the stretching clamping rollers IE1, the longitudinal stretching force F becomes greater than the longitudinal viscous resistance f2 of the glass. Here, the stretching coefficient V2 / V1 is 4.0-5.0. After stretching, the width of the glass substrate A2 becomes W2. Finally, the glass substrate A2 enters the winding and packaging unit G, where the packaging speed is W=V / R (R is the radius of the packaging roller + the thickness t of the glass substrate × the cycle).

[0033] In the horizontal secondary stretching method for ultra-thin flexible glass provided by the present invention, the above-mentioned horizontal secondary stretching apparatus for ultra-thin flexible glass is started, the heating unit is started to preheat the temperature of each zone to a predetermined temperature, and at the same time, the air flotation device, the cooling mechanism and the roller unit (i.e., the clamping and conveying roller A1, the lateral clamping and spreading roller D1, the stretching clamping roller IE1, the stretching clamping roller IIF1 and the winding mechanism G1) are started. In use, glass substrate A2 produced by the overflow method is fed into welding unit B via supply unit A, brought into contact with the previous glass substrate A2, and laser welding machine B2 is started, moving it along both the horizontal and vertical directions at a conveying speed V to complete the welding. After welding is complete, glass substrate A2 is conveyed by welding unit B to preheating unit C of the drawing furnace, where the temperature of heating element T2 is controlled between 1000°C and 950°C by temperature detector T1. The conveying speed of glass substrate A2 is controlled at V1 by conveying clamping roller I, and glass substrate A2 is preheated in preheating unit C for 20 to 30 seconds. When the temperature of the preheated glass sheet A2 reaches near its softening point, shrinkage occurs due to the movement of internal mass points. The shrunken glass sheet A2 passes from the preheating unit C to the transverse stretching unit D, where the external turbine worm mechanism D2 changes the rotation direction of the transverse clamping and stretching rollers D1 to achieve rotation, preventing the glass sheet A2 from shrinking inward in the width direction due to preheating. Next, the glass sheet A2 passes from the transverse stretching unit D to the longitudinal stretching unit E, where it is cooled and stretched in the longitudinal direction by the stretching clamping rollers IE1, and the conveying speed of the glass sheet A2 is controlled to V2. Next, the glass substrate A2 passes from the longitudinal stretching unit E into the annealing unit F, where the temperature and speed are adjusted to maintain the temperature field in this zone at 600°C to 800°C. From the annealing unit F, the glass substrate A2 passes into the winding and packaging unit G. After natural cooling, the annealed glass substrate A2 is wound and packaged by the winding mechanism G1, realizing continuous production.

[0034] The above content is only intended to explain the technical idea of ​​the present invention, and is not intended to limit the scope of protection of the present invention. Any modifications made based on the technical solutions in accordance with the technical idea of ​​the present invention are included within the scope of protection of the claims of the present invention. [Explanation of symbols]

[0035] A-Supply Unit A1-Transport clamping roller I A2-Glass plate B-welding unit B1-welding wire B2-Laser Welder C-Preheating unit C1-Transport clamping roller II D-Transverse stretching unit D1 - Lateral clamping and spreading roller D2 - Turbine rotating shaft E-longitudinal tension stretching unit E1-Stretching clamping roller I F-Annealing Unit F1-Stretching clamping roller II T1-Temperature detector T2-Heating Device G-winding packaging unit G1-winding mechanism L 上 -Top cooling mechanism L 下 -Bottom cooling mechanism L1-Thermal layer L2-lower soaking plate L3-Upper heating plate L21-Lower Heat Dissipation Plate Hole L31-Upper Heat Equalizer Hole L4 - Intake pipe L5 - Exhaust pipe L51-Opening control valve L6-Furnace door mechanism L7-Zone Divider

Claims

1. A horizontal secondary stretching apparatus for ultra-thin flexible glass, comprising a supply unit (A), a welding unit (B), a preheating unit (C), a transverse stretching / spreading unit (D), a longitudinal stretching / spreading unit (E), an annealing unit (F) and a roll-up packaging unit (G) connected in sequence, wherein the supply unit (A), the welding unit (B), the preheating unit (C), the transverse stretching / spreading unit (D), the longitudinal stretching / spreading unit (E), the annealing unit (F) and the roll-up packaging unit (G) are all provided with air flotation devices and rollers, and the air flotation devices are installed on both the upper and lower sides of the glass blank (A2), and the upper and lower sides of the glass blank (A2) are a preheating unit (C), a transverse stretching unit (D), a longitudinal stretching unit (E) and an annealing unit (F) each have a heating unit installed between the air flotation device and the glass substrate (A2); a cooling mechanism is installed in the longitudinal stretching unit (E) and the annealing unit (F), and the cooling mechanism is installed between the heating unit and the glass substrate (A2).

2. 2. The horizontal secondary drawing apparatus for ultra-thin flexible glass according to claim 1, wherein the air flotation device comprises an intake pipe (L4), an exhaust pipe (L5) and an opening control valve (L51), wherein the intake pipes (L4) are evenly arranged at the bottoms of the supply unit (A), the welding unit (B), the preheating unit (C), the transverse stretching / spreading unit (D), the longitudinal tension / stretching unit (E), the annealing unit (F) and the winding / packaging unit (G), and the exhaust pipes (L5) are evenly arranged at the tops of the preheating unit (C), the transverse stretching / spreading unit (D), the longitudinal tension / stretching unit (E) and the annealing unit (F), and the opening control valve (L51) is installed outside the exhaust pipe (L5) to adjust the exhaust volume of the exhaust pipe (L5).

3. 2. The horizontal secondary drawing apparatus for ultra-thin flexible glass according to claim 1, wherein the gas temperature in the air flotation device is maintained to match the temperatures of the supply unit (A), the welding unit (B), the preheating unit (C), the transverse stretching unit (D), the longitudinal tensioning unit (E), the annealing unit (F) and the winding and packaging unit (G).

4. 4. The horizontal secondary drawing apparatus for ultra-thin flexible glass according to claim 1, wherein the heating unit comprises a heat-insulating layer (L1), a heating device (T2) and a heat-equalizing plate are installed inside the heat-insulating layer (L1), the heat-equalizing plate is installed symmetrically on both sides of the glass original plate (A2), the heat-equalizing plate has heat-equalizing plate holes, the heating device (T2) is installed outside the heat-equalizing plate, and the cooling mechanism is installed between the heat-equalizing plate and the heating device (T2).

5. 5. The horizontal secondary drawing apparatus for ultra-thin flexible glass according to claim 4, wherein a temperature sensor (T1) is embedded in the heat-insulating layer (L1), and the temperature sensor (T1) penetrates the heat-insulating layer (L1) and the heat-equalizing plate to approach the glass substrate (A2).

6. The horizontal secondary drawing apparatus for ultra-thin flexible glass according to any one of claims 1 to 3, characterized in that the heat equalizing plate is made of silicon carbide material, and the heating device (T2) is made of iron chromium aluminum or silicon molybdenum material.

7. 4. The horizontal secondary drawing apparatus for ultra-thin flexible glass according to claim 1, wherein the supply unit (A), the welding unit (B) and the preheating unit (C) are all provided with clamping and conveying rollers (A1); the transverse stretching and spreading unit (D) is provided with a transverse clamping and spreading roller (D1); the longitudinal pulling and stretching unit (E) is provided with a stretching and clamping roller I (E1); the annealing unit (F) is provided with a stretching and clamping roller II (F1); and the winding and packaging unit (G) is provided with a rotatable winding mechanism (G1).

8. 8. The horizontal secondary drawing apparatus for ultra-thin flexible glass according to claim 7, wherein the peripheral speed ratio of the nip and conveyance roller (A1), the stretching nip roller I (E1), and the stretching nip roller II (F1) is 1:n:n ( ).

9. 4. The horizontal secondary drawing apparatus for ultra-thin flexible glass according to claim 1, wherein a laser welder (B2) that moves back and forth along the width direction of the glass original sheets (A2) is installed within the welding unit (B), and the laser welder (B2) can track the positions of the two front and rear glass original sheets (A2) and complete the welding of the two glass original sheets (A2).

10. 4. A drawing method for the horizontal secondary drawing apparatus for ultra-thin flexible glass according to claim 1, comprising the steps of: starting the horizontal secondary drawing apparatus for ultra-thin flexible glass; transporting a glass raw sheet (A2) into a fusing unit (B) via a supply unit (A); completing welding of the two front and rear glass raw sheets (A2) in the fusing unit (B); then, causing the glass raw sheet (A2) to enter a preheating unit (C) of a drawing furnace for preheating; then, causing the glass raw sheet (A2) to enter a transverse direction stretching unit (D) for stretching in the transverse direction; then, causing the glass raw sheet (A2) to enter a longitudinal direction tension stretching unit (E) for cooling and performing longitudinal tension stretching; then, causing the glass raw sheet (A2) to enter an annealing unit (F) for reducing the temperature; and finally, causing the glass raw sheet (A2) to enter a winding packaging unit (G) for product packaging.

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