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 an apparatus and method for horizontal secondary drawing for ultra-thin flexible glass. [Background technology]

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

[0003] At present, the direct production methods of ultra-thin flexible glass include the float method, the overflow method and the slit downdraw method. The production process principle of ultra-thin glass by the float method is basically the same as that by the ordinary float method, but the ultra-thin float method has high requirements for process management and equipment, and is difficult to produce. The biggest advantage of the overflow downdraw method is that the glass has good surface quality, but the process management of ultra-thin glass production is very difficult and the technical requirements are high, so the degree of industrialization is not high. When flexible glass is produced by the slit downdraw method, the surface of the flexible glass contacts the slit, so the surface quality of the glass is affected by the shape and material of the slit, and the produced flexible glass product needs to be polished, which is complicated, costly and has a low production capacity. The indirect production methods of ultra-thin flexible glass include the chemical thinning method and the secondary drawing method. The common problem of these two methods is that they can only produce small batches and cannot meet market demand. In addition, the flexible glass substrate produced by the chemical thinning method has defects such as scratches and dents on its surface, and needs to be polished. The surface of flexible glass is very difficult to polish, and the glass is easily broken, resulting in a low yield. The current secondary drawing method involves heating the glass preform in a heating furnace to a softening temperature, and then performing an annealing process after the flexible glass is drawn, which has the disadvantages of being unable to produce continuously, requiring high factory equipment height, low production volume, and difficult control. In addition, the flexible glass produced in the heating furnace is bent downward due to gravity, and the quality of the produced flexible glass cannot be ensured. Summary of the Invention [Problem to be solved by the invention]

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

[0005] In order to achieve the above objectives, the present invention is realized by adopting 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 tensile 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 tensile stretching unit, the annealing unit and the roll-up packaging unit are all provided with air floating devices and rollers, the air floating devices are installed on both the upper and lower sides of the original glass sheet and are used to maintain a pressure difference between the upper and lower sides of the original glass sheet, the rollers are installed on both sides in the width direction of the original glass sheet and are used to clamp and transport the original glass sheet, and a heating unit is each installed in the preheating unit, the transverse stretching unit, the longitudinal tensile stretching unit and the annealing unit, the heating unit is installed between the air floating device and the original glass sheet, and a cooling mechanism is installed in the longitudinal tensile stretching unit and the annealing unit, and 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 aperture control valve, the intake pipes are evenly arranged at the bottoms of the supply unit, the welding unit, the preheating unit, the transverse stretching unit, the longitudinal tensile stretching unit, the annealing unit and the roll-up packaging unit, the exhaust pipes are evenly arranged at the tops of the preheating unit, the transverse stretching unit, the longitudinal tensile stretching unit and the annealing unit, and the aperture control valve is installed outside the exhaust pipe to realize the adjustment of 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, the welding unit, the preheating unit, the transverse stretching unit, the longitudinal stretching unit, the annealing unit and the wrap and wrap unit.

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

[0011] Preferably, the heat spreader plate is made of a silicon carbide material and the heating device is made of an 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 tensile 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 conveyor roller, the stretch nip roller I, and the stretch nip roller II is 1:n:n The image is JPEG2024547228000002.jpg1447.

[0014] Preferably, a laser welder that moves back and forth along the width direction of the glass original sheets is installed in the welding unit, 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 the horizontal secondary drawing apparatus for ultra-thin flexible glass, which includes starting up the horizontal secondary drawing apparatus for ultra-thin flexible glass, transporting a glass original sheet into a fusing unit via a supply unit, completing welding of the front and rear two 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 causing it to enter a transverse stretching unit for transverse stretching, then causing it to enter a longitudinal tensile drawing unit for cooling and performing longitudinal tensile stretching, then causing it to enter an annealing unit for reducing the temperature, and finally causing the glass original sheet to enter a roll-up packaging unit for product packaging. Effect 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 can reduce the tendency of the glass sheet to bend downward due to gravity during the transverse transport process, ensure that the glass sheet always maintains a stable shape during the stretching transport process, and enhance the control of thickness, warping, and stress during the stretching process of the glass sheet. A transverse stretching unit and a longitudinal tensile stretching unit are used to perform cross stretching, preventing the shrinkage of the original glass sheet. A heating unit and a cooling mechanism are installed together to achieve effective control of temperature. The equipment is divided into seven functional zones, including feeding, welding, preheating, pulling, stretching, annealing and winding. Through transmission and secondary stretching, the glass substrate original plate produced by the overflow method is sequentially fed through the feeding zone, preheated to near the softening point by the laser welding machine, effectively reducing the width shrinkage of the glass plate by the horizontal clamping spreading mechanism, and simultaneously stretching in the longitudinal direction by the vertical stretching mechanism, and finally annealing and winding to realize the continuous production of ultra-thin flexible glass, which has a relatively high surface quality and does not require secondary polishing, solving the technical difficulties of continuous production and small size that exist in traditional secondary stretching, and retaining the surface quality of the 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 realize lateral clamping and tensile stretching in the width direction of the glass sheet by means of a turbine worm mechanism, thereby suppressing shrinkage of the original glass sheet.

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

[0021] [Figure 1] 1 is an overall schematic diagram of an air levitation device of the present invention; [Diagram 2] FIG. 2 is a plan view of the horizontal secondary drawing apparatus for ultra-thin flexible glass of the present invention. [Diagram 3] FIG. 2 is a front view of the 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. [Diagram 5] FIG. 4 is a cross-sectional view of a portion EE 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 PREFERRED EMBODIMENTS

[0022] In order to make those skilled in the art better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely below 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, based on the embodiments of the present invention, all other embodiments that those skilled in the art can obtain without creative labor shall fall within the protection scope of the present invention.

[0023] In addition, 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 sequence. It is to be understood that the data used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein may be performed in an order other than that shown or described herein. In addition, the terms "comprises" and "has" 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 steps or units expressly recited, but may include other steps or units that are not expressly recited or inherent to these processes, methods, products, 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 original plate 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 original plate A2 passes horizontally through the center of the entire apparatus, and the secondary elongation of the glass original plate 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 unit D, a longitudinal tensile stretching unit E, an annealing unit F, and a winding and packaging unit G connected in sequence.

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

[0028] The supply unit A, the welding unit B and the preheating unit C are each provided with a plurality of sets of clamping and conveying rollers A1, which are symmetrically installed along the width direction of the elongating machine to clamp the glass original sheet A2 and convey the glass original sheet A2 at a speed V1. The supply unit A is used to convey and supply the glass original sheet A2 clamped by the conveying clamping rollers IA1 along the length direction. The welding unit B is used to weld the glass original sheet A2. The welding unit B further includes a laser welder B2 that reciprocates along the width direction of the elongating machine, and the laser welder B2 is fixed above the glass original sheet A2 by a bracket attached to the outside of the furnace entrance, so that it reciprocates along the width direction of the glass original sheet A2. The laser welder B2 can track the positions of the two glass original sheets A2 in front and behind, and complete the welding of the two glass original sheets A2 (see FIG. 2 for the welding line B1 of the two glass original sheets A2 after welding). The preheating unit C is used to preheat the glass substrate A2.

[0029] The heating unit is used to heat the glass blank A2. The heating unit is installed in the preheating unit C, the transverse stretching unit D, the longitudinal tensile stretching unit E and the annealing unit F. As shown in Figures 4 and 5, the heating unit uses a top and bottom heating mode, and includes a heat-insulating layer L1, which can ensure the temperature of the top and bottom of the glass blank A2. A heating device T2 and a heat-equipping plate are installed inside the heat-insulating layer L1. The heat-equipping plates are installed horizontally and symmetrically on both sides of the glass original plate A2 and made of silicon carbide material. The heat-equipping plate consists of an upper heat-equipping plate L3 and a lower heat-equipping plate L2. The upper heat-equipping plate L3 and the lower heat-equipping plate L2 jointly form a relatively sealed heat-equipping space. The upper heat-equipping plate L3 has evenly arranged upper heat-equipping plate air holes L31, and the lower heat-equipping plate L2 has evenly arranged lower heat-equipping plate air holes L21. The heating device T2 is installed horizontally on the outside of the heat-equipping plate and made of iron chromium aluminum or silicon molybdenum material. A temperature sensor T1 is embedded in the heat-insulating layer L1. The temperature sensor T1 penetrates the heat-insulating layer L1 and the heat-equipping plate and is spaced a certain distance from the glass original plate A2. The temperature sensor T1 is symmetrically installed on the top and bottom of the heat-insulating 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 inside the heat-retaining layer L1. The furnace door mechanism L6 and the zone-dividing partition plates L7 make the spaces of each zone relatively independent. The furnace door mechanism L6 and the zone-dividing partition plates L7 in the furnace cooperate with the intake section installed below the glass original sheet A2 and the exhaust section installed at the top, so that during the transport process, the pressure difference below the glass original sheet A2 in the furnace is greater than that above, thereby maintaining the glass original sheet A2 in a horizontal state and further suppressing the downward bending of the glass original sheet A2 during the horizontal transport and stretching process. At the same time, during the transport process, the upper and lower surfaces of the glass original sheet A2 do not come into contact with other parts of the device, ensuring the surface quality of the glass original sheet A2. The intake pipe L4 of the air flotation device penetrates the bottom of the heat retention layer L1, and the clean air introduced by the intake pipe L4 passes through the lower heat equalizer plate air hole L21 into the space below the glass original plate A2. The exhaust pipe L5 penetrates the top of the heat retention layer L1, and the gas in the space above the glass original plate A2 is exhausted through the upper heat equalizer plate air hole 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-950°C, the temperature in the transverse stretching unit D to be above the annealing point, preferably 950°C-900°C, the temperature in the longitudinal tensile stretching unit E to be 900°C-750°C, the temperature in the annealing unit F to be 750°C-600°C, and the temperature at the annealing outlet to be 300°C-250°C.

[0030] The transverse stretching unit D is used to stretch the glass raw sheet A2 in the transverse direction. The transverse stretching unit D includes a transverse clamping and spreading roller D1, which is made of high-temperature resistant metal material and has a pattern on its surface to increase friction force. When the transverse clamping and spreading roller D1 clamps the glass raw sheet A2, the surface pattern is interlocked with the softened glass raw sheet A2. The transverse clamping and spreading roller D1 is mounted on both sides of the worm of the turbine worm mechanism, and the turbine rotating shaft D2 protrudes from the furnace body, and the external turbine driving shaft rotates the transverse clamping and spreading roller D1 mounted on both sides of the worm of the turbine worm mechanism, that is, rotates perpendicular to the conveying direction, and the transverse clamping and spreading roller D1 can suppress the widthwise shrinkage of the glass raw sheet A2 and realize the transverse spreading of the glass. The longitudinal stretching unit E is used to cool the glass raw sheet A2 and longitudinally stretch it. The longitudinal stretching unit E includes a stretching clamp roller IE1. When the thickness of the glass sheet A2 is 0.5 mm, the stretching of the stretching clamp roller IE1 can produce flexible glass with a thickness of less than 0.1 mm. The annealing unit F is used to reduce the temperature of the glass sheet A2. The annealing unit F includes a stretching clamp roller IIF1. The winding packaging unit G is used to package the product. The winding packaging unit G includes a rotatable winding mechanism G1. The winding mechanism G1 is installed outside the annealing unit F and controlled by an independent rotating mechanism. When the glass sheet enters the winding packaging unit G, the winding mechanism G1 can wind the glass sheet A2, thereby realizing continuous production. The transverse clamping and spreading roller D1, the stretching clamping roller IE1 and the stretching clamping roller IIF1 are all symmetrically installed in a plurality of sets along the width direction of the stretching device, used to clamp the glass original sheet A2 and transport the glass original sheet A2 at a speed V2, the peripheral speed ratio of the speed V2 to the speed V1 is 1, h1 is the thickness of the glass original sheet A2, h2 is the thickness of the flexible glass after stretching, and the preferred peripheral speed ratio is 5: 1. The stretching clamping roller IE1 and the stretching clamping roller IIF1 are both made of asbestos material, which generates a very large friction force with the glass original sheet A2.The clamping and conveying roller A1 is fixed to the outer periphery of the supply unit A and the fusing unit B by an independent support mechanism and directly clamps the glass. The transverse clamping and spreading roller D1, the stretching clamping roller IE1 and the stretching clamping roller IIF1 are all fixed correspondingly to the inside of the preheating unit C, the transverse stretching and spreading unit D, the longitudinal tensile stretching unit E and the annealing unit F by independent support mechanisms and extend into the furnace through corresponding mounting holes opened on the sides of the preheating unit C, the transverse stretching and spreading unit D, the longitudinal tensile stretching unit E and the annealing unit F to clamp the glass.

[0031] The cooling mechanism is used to reduce the temperature of the glass sheet A2. The cooling mechanism is installed inside the longitudinal tensile stretching unit E and the annealing unit F, and the cooling medium of the cooling mechanism is cooling water or cooling air. The cooling mechanism is the upper cooling mechanism L 上 and lower cooling mechanism L 下 Including the 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, the width of the glass original sheet A2 is W1, the clamping and conveying speed is V1, the glass original sheet 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 a force N is applied outward in the width direction, and the inward shrinkage force of the glass original sheet A2 is f1, N>f1, and the longitudinal tensile stretching speed is V2; The glass raw sheet A2 passes through the transverse stretching unit D and enters the longitudinal tensile stretching unit E. The longitudinal stretching force F is greater than the longitudinal viscous resistance f2 of the glass due to the clamping of the stretching clamping rollers IE1. Here, the stretching coefficient is V2 / V1=4.0-5.0. After stretching, the width of the glass raw sheet A2 becomes W2. Finally, the glass raw sheet A2 enters the winding and packaging unit G, and the packaging speed is W=V / R (R is the radius of the packaging roller+the thickness t of the glass sheet×the period).

[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 floating 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. During use, the glass original sheet A2 produced by the overflow method is fed into the welding unit B through the supply unit A, the glass original sheet A2 is brought into contact with the previous glass original sheet A2, the laser welding machine B2 is started, and the glass original sheet A2 is moved along the horizontal and longitudinal directions at the same time according to the conveying speed V to complete the welding, and the glass original sheet A2 after the welding is completed is conveyed to the preheating unit C of the drawing furnace by the welding unit B, and the temperature of the heating element T2 is controlled to 1000℃-950℃ in combination with the temperature detector T1, and the conveying speed of the glass original sheet A2 is controlled to V1 by the conveying clamping roller I, and the glass original sheet A2 is preheated in the preheating unit C for 20-30s. When the temperature of the preheated glass sheet A2 reaches near its softening point, the movement of the internal mass points causes a shrinkage phenomenon, and the shrunken glass sheet A2 enters the transverse stretching unit D from the preheating unit C, and the transverse clamping and stretching roller D1 is rotated by the external turbine worm mechanism D2 to change the rotation direction of the transverse clamping and stretching roller D1 to achieve rotation, thereby suppressing the inward shrinkage of the glass sheet A2 in the width direction caused by preheating. Next, the glass sheet A2 enters the longitudinal stretching unit E from the transverse stretching unit D, and is cooled in the longitudinal stretching unit E, and is stretched in the longitudinal direction by the stretching clamping roller IE1, and the conveying speed of the glass sheet A2 is controlled to V2. Next, the glass original sheet A2 passes through the longitudinal tensile stretching unit E and enters the annealing unit F. The temperature and speed of the annealing unit F are matched and adjusted to maintain the temperature field in this zone at 600°C to 800°C. The glass original sheet A2 passes through the annealing unit F and enters the winding packaging unit G. After natural cooling, the annealed glass original sheet A2 is wound and packaged as a product by the winding mechanism G1, thereby 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 Welding Machine C-Preheating unit C1-Transport clamp roller II D-Transverse stretching unit D1-Transverse clamping and spreading roller D2-Turbine shaft E-longitudinal tensile stretching unit E1-Stretching clamp roller I F-Annealing Unit F1-Stretching clamp roller II T1-Temperature detector T2-Heating Device G-Roller 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 equalizer plate hole L31-Upper heat equalizer plate hole L4 - Intake pipe L5 - Exhaust pipe L51-Opening control valve L6-Furnace door mechanism L7-Zone division plate

Claims

1. The horizontal secondary stretching apparatus for ultra-thin flexible glass includes a supply unit (A), a welding unit (B), a preheating unit (C), a transverse stretching unit (D), a longitudinal tensile stretching unit (E), an annealing unit (F) and a roll-up packaging unit (G), which are connected in sequence. The supply unit (A), the welding unit (B), the preheating unit (C), the transverse stretching unit (D), the longitudinal tensile stretching unit (E), the annealing unit (F) and the roll-up packaging unit (G) are all provided with air flotation devices and rollers. 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 provided with air flotation devices and rollers. a pressure difference between the glass sheet and the glass substrate; rollers are installed on both sides of the glass sheet in the width direction to clamp and transport the glass sheet; heating units are installed in the preheating unit (C), the transverse stretching unit (D), the longitudinal tensile stretching unit (E) and the annealing unit (F), and the heating units are installed between the air flotation device and the glass sheet; cooling mechanisms are installed in the longitudinal tensile stretching unit (E) and the annealing unit (F), and the cooling mechanisms are installed between the heating units and the glass sheet.

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 aperture control valve (L51), the intake pipe (L4) is evenly arranged at the bottom of the supply unit (A), the welding unit (B), the preheating unit (C), the transverse stretching unit (D), the longitudinal tensile stretching unit (E), the annealing unit (F) and the roll-packaging unit (G), the exhaust pipe (L5) is evenly arranged at the top of the preheating unit (C), the transverse stretching unit (D), the longitudinal tensile stretching unit (E) and the annealing unit (F), and the aperture 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 as claimed in claim 1, characterized in that 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 tensile stretching 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 detector (T1) is embedded in the heat-insulating layer (L1), and the temperature detector (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 stretching 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 transverse clamping and spreading rollers (D1), the longitudinal tensile stretching unit (E) is provided with stretching and clamping rollers I (E1), the annealing unit (F) is provided with stretching and clamping rollers II (F1), and the winding and packaging unit (G) is provided with a rotatable winding mechanism (G1).

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

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 sheet (A2) is installed in 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. A method for stretching the glass substrate in the horizontal secondary stretching apparatus for extremely thin flexible glass according to any one of claims 1 to 9, comprising the steps of starting the horizontal secondary stretching apparatus for extremely thin flexible glass, transporting the glass substrate (A2) into the fusing unit (B) via the supply unit (A), completing welding of the two glass substrates (A2) in the fusing unit (B), then entering the glass substrate (A2) into the preheating unit (C) of the stretching furnace for preheating, then entering the transverse stretching unit (D) for stretching in the transverse direction, then entering the longitudinal tensile stretching unit (E) for cooling and performing longitudinal tensile stretching, then entering the annealing unit (F) for reducing the temperature, and finally entering the glass substrate (A2) into the winding packaging unit (G) for product packaging.

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