Roller table transfer device for electronic float glass

Abstract

1. A roller table transfer device for electronic float glass, comprising: a plurality of transfer rollers rotatably installed on an inner wall of an annealing furnace; a plurality of boron nitride rings fixedly fitted on an outer wall of each of the transfer rollers; a heat-resistant steel tube is installed on both sides of each transfer roller; a plurality of exhaust holes are installed on the outer wall of the heat-resistant steel tube, the heat-resistant steel tube communicates with an external hot air supply box; and a plurality of cleaning parts used together with the transfer rollers are installed on the inner bottom of the annealing furnace.

Description

[Technical Field]

[0001] This application claims priority from a Chinese patent application bearing application number 202211722710.6 and entitled "Roller table transfer device for high-end electronic float glass," filed with the State Intellectual Property Office of the People's Republic of China on December 30, 2022, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the field of glass production technology, and in particular to a roller table transfer device for electronic float glass. [Background technology]

[0003] The float glass forming process begins by introducing molten liquid glass at approximately 1100°C into a tin bath via a channel or flow tank. Due to the different densities of liquid glass and liquid tin, the liquid glass floats on the liquid tin. The liquid glass is spread by gravity and surface tension, polished, and cooled evenly. A top roll then stretches and laminates it to form a glass ribbon of a consistent thickness. The glass ribbon is then gradually cooled in the tin bath until it becomes a glass sheet. Once cooled to approximately 650°C at the exit of the tin bath, it is lifted by a transfer roller table and separated from the tin bath by the traction force of the annealing furnace's transport rollers. It then enters the annealing furnace and is annealed to relieve stress. The glass is then inspected, cut, boxed, and packaged for storage.

[0004] The traction force for producing float glass is primarily generated by the rollers in the annealing furnace. Generally, the rollers in the annealing furnace for float glass are steel or ceramic rollers, and even higher-quality steel rollers with a zirconia-plated surface are used. Immediately after the glass ribbon leaves the tin bath, friction occurs between the glass ribbon and the annealing furnace conveying rollers. In particular, the three transfer rollers on the transfer roller table are contaminated to varying degrees by impurities such as tin oxide from the tin bath during the long production process. This results in numerous sticky substances and irregular protrusions on the surface of the transfer rollers, which in turn results in scratches and fluff-like glass defects of varying degrees on the underside of the glass ribbon. Summary of the Invention

[0005] SUMMARY OF THE INVENTION The purpose of the present invention is to provide a roller table transfer device for electronic float glass to solve the problems of the prior art.

[0006] An embodiment of the present invention provides a roller table transfer device for electronic float glass, comprising: a plurality of transfer rollers rotatably installed on the inner wall of an annealing furnace; a plurality of boron nitride rings fixedly fitted on the outer wall of each of the transfer rollers; a heat-resistant steel pipe installed on both sides of each of the transfer rollers; a plurality of exhaust holes installed on the outer wall of the heat-resistant steel pipe, which communicates with an external hot air supply box; and a plurality of cleaning devices installed on the inner bottom of the annealing furnace, which are used in conjunction with the transfer rollers.

[0007] In some embodiments of the present invention, a plurality of pairs of first support frames are symmetrically fixed to the inner bottom of the annealing furnace, a lifting rod is installed on the upper end surface of each of the first support frames, two mounting rings are symmetrically fixedly fitted onto the outer wall of each of the heat-resistant steel pipes, and the upper ends of the lifting rods are fixedly connected to the outer walls of the mounting rings.

[0008] In some embodiments of the present invention, each of the cleaning components includes two second support frames symmetrically fixed to the inner bottom of the annealing furnace, and the upper surfaces of the two second support frames are An identical mounting seat is fixed to the end face, and a scraper is installed in the mounting seat.

[0009] In some embodiments of the present invention, a lower penetration groove is installed on the side wall of each mounting seat, a push-down plate is movably installed in the lower penetration groove, a scraper is fixed to the upper end surface of the corresponding push-down plate, and the scraper movably penetrates the mounting seat.

[0010] In some embodiments of the present invention, each of the heat-resistant steel pipes is installed on both the left and right sides of each of the transition rollers, there is a certain gap between the scraper and the outer wall of the boron nitride ring, and the scraper is installed on the left side of the boron nitride ring.

[0011] In some embodiments of the present invention, a plurality of telescopic rods are fixed between each of the lower penetration tanks and the pusher plate, and a plurality of springs are fixed between the lower penetration tanks and the pusher plate, and the springs are movably fitted on the outer walls of the telescopic rods.

[0012] In some embodiments of the present invention, an inclined scrap block is fixed to the upper end surface of each of the mounting seats.

[0013] In some embodiments of the present invention, the inclined scrap block is attached to the scraper by pasting, with the inclined surface of the inclined scrap block facing the transition roller.

[0014] In some embodiments of the present invention, both sides of each of the presser plates movably penetrate the annealing furnace, and both sides of the annealing furnace are provided with presser-through tanks that are used in conjunction with the presser plates.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. After the float glass ribbon leaves the tin bath outlet, both edges of the glass ribbon directly contact the outer walls of the boron nitride rings, and the transfer rollers rotate the corresponding boron nitride rings to convey the glass ribbon. During this process, hot air supply boxes deliver hot nitrogen gas into each heat-resistant steel pipe, which flows upward through the exhaust ports of the corresponding heat-resistant steel pipes, applying a biasing force to the underside of the effective width of the float glass ribbon and preventing dents from forming in the effective width of the glass ribbon. This method avoids friction between the transfer rollers and the underside of the effective width of the glass ribbon during conveyance, effectively solving the problem of scratches and burrs on the underside of the float glass ribbon sheet. Furthermore, the use of nitrogen gas air bearings allows the roller table transfer device to be filled with nitrogen gas, preventing air from entering the tin bath through the tin bath outlet and reducing the generation of impurities such as tin oxide in the tin bath.

[0017] 2. When in use, there is a certain gap between the scraper and the outer wall of the boron nitride ring, and the scraper is installed on the left side of the boron nitride ring. When the boron nitride ring rotates and impurities adhering to its outer wall come into contact with the scraper, a leftward biasing force is applied to the scraper, but the scraper remains stationary, scraping off the impurities adhering to the outer wall of the boron nitride ring, making it convenient to use. [Brief explanation of the drawings]

[0018] The drawings described herein are intended to provide a further understanding of the invention and are intended to constitute a part of the invention. The exemplary embodiments and descriptions thereof are intended to be illustrative of the invention and are not to be construed as limiting the invention.

[0019] [Figure 1] FIG. 1 is a schematic diagram of the overall configuration of a roller table shifting device according to an embodiment of the present invention. [Figure 2]FIG. 2 is a side view of the roller table transfer device according to the embodiment of the present invention. [Figure 3] FIG. 3 is a distribution diagram of the transfer rollers and heat-resistant steel pipes in the annealing furnace in the embodiment of the present invention. [Figure 4] FIG. 4 is a schematic diagram of the connection between the heat-resistant steel pipe and the mounting ring in an embodiment of the present invention. [Figure 5a] FIG. 5a is a schematic diagram of the connection between the second support frame and the mounting seat in the embodiment of the present invention. [Figure 5b] FIG. 5b is a side view of the connection between the second support frame and the mounting seat in the embodiment of the present invention. [Figure 6] FIG. 6 is a schematic diagram of the internal configuration of the lower through-vessel in the embodiment of the present invention. [Figure 7] FIG. 7 is a schematic diagram of the internal structure of the mounting seat in the embodiment of the present invention. [Figure 8] FIG. 8 is a schematic diagram of the internal configuration of the cleaning component in the embodiment of the present invention. [Explanation of symbols]

[0020] 1: annealing furnace, 2: transition roller, 3: boron nitride ring, 31: boron nitride rings on both sides, 4: heat-resistant steel pipe, 41: exhaust hole, 5: first support frame, 6: lifting rod, 7: mounting ring, 8: second support frame, 9: mounting seat, 91: connection part, 10: scraper, 11: lower penetration tank, 12: push-down plate, 121: horizontal part of push-down plate; 122: vertical part of push-down plate, 13a: telescopic rod, 13b: spring, 14: inclined scrap block, 15: push-down penetration tank, 16: guide rod. DETAILED DESCRIPTION OF THE INVENTION

[0021] In order to clarify the objectives, technical solutions and advantages of the present invention, the present invention will be described in more detail below with reference to the drawings and examples. It is clear that the described examples are only some of the examples of the present invention, and do not represent all of the examples. Based on the examples of the present invention, all other examples that can be obtained by those skilled in the art are included in the scope of protection of the present invention.

[0022] As shown in FIGS. 1 to 6 , an embodiment of the present invention provides a roller table transfer device for electronic float glass, which includes a plurality of transfer rollers 2 rotatably mounted on the inner wall of an annealing furnace 1, each of which has a plurality of boron nitride rings 3 fixedly fitted to its outer wall. Each of the transfer rollers 2 is fitted with a heat-resistant steel pipe 4 on both sides, each of which has a plurality of exhaust holes on its outer wall and communicates with an external hot air supply box. The inner bottom of the annealing furnace 1 is equipped with a plurality of cleaning devices for use with the transfer rollers 2. As shown in FIGS. 1 and 2 , the heat-resistant steel pipes 4 are mounted on both the left and right sides of each of the transfer rollers 2. In an actual device, the left side of FIG. 1 is generally the front side and the right side is the rear side, so it can be said that the heat-resistant steel pipes 4 are mounted on both the front and rear sides of each of the transfer rollers 2.

[0023] For example, there are six transfer rollers 2, each with a diameter of 150 mm. There are ten boron nitride rings 3 fitted around each transfer roller 2. Each boron nitride ring 3 has an inner diameter of 150 mm, an outer diameter of 170 mm, and a width of 40 mm. There are twelve heat-resistant steel tubes 4. Each heat-resistant steel tube 4 has a diameter of 40 mm and is made of 2520 stainless steel. The spacing between exhaust holes in the heat-resistant steel tubes 4 is 25 mm, and the diameter of each exhaust hole is 0.3 mm. The heat-resistant steel tubes 4 are 15 mm vertically away from the glass ribbon, i.e., the plane formed by the upper surfaces of the heat-resistant steel tubes 4 is 5 mm lower than the plane formed by the upper surfaces of the transfer rollers 2. The vertical adjustable distance of the heat-resistant steel tubes 4 is 20 mm, but the specific adjustable distance depends on the thickness and When producing ultra-thin float glass for electronics with a thickness of 1.1 mm or less, the distance between the heat-resistant steel tube 4 and the glass ribbon should be about 15 mm, and the pressure of the nitrogen gas inside the heat-resistant steel tube 4 should be about 0.05 Kpa.

[0024] During use, the float glass ribbon exits the tin bath and enters the electronic float glass roller table transfer device. Both edges of the glass ribbon (not shown) directly contact the outer walls of the boron nitride rings. As shown in Figure 2, both edges of the glass ribbon (not shown) directly contact the outer walls of the boron nitride rings 31 on both sides of the transfer roller 2. At the same time, the underside of the active portion of the glass ribbon also contacts the upper surface of each boron nitride ring 31 on the transfer roller 2. The transfer roller 2 rotates the corresponding boron nitride ring 3, conveying the glass ribbon. During this process, a hot air supply box delivers hot nitrogen gas to each heat-resistant steel pipe 4. The hot nitrogen gas flows upward through the exhaust holes of the corresponding heat-resistant steel pipes 4, exerting a biasing force on the underside of the active width of the float glass ribbon and preventing the active width of the glass ribbon from becoming dented. As shown in Figure 4, an exhaust hole 41 is located at the top of the heat-resistant steel pipe 4, and the hot nitrogen gas flows upward from the exhaust hole 41 onto the float glass ribbon. This method can avoid friction between the transfer roller and the underside of the effective width of the glass ribbon when transporting the float glass ribbon, effectively solving the problem of scratches and fluff-like defects on the underside of the float glass ribbon plate. Furthermore, when a nitrogen gas air bearing is used, the roller table transfer device can be filled with nitrogen gas, preventing air inside the roller table transfer device from entering the tin bath through the tin bath outlet, thereby reducing the generation of impurities such as tin oxide in the tin bath.

[0025] As shown in Figures 1 to 4, multiple pairs of first support frames are symmetrically fixed to the inner bottom of the annealing furnace 1. As shown in Figures 2 and 4, a lifting rod 6 is installed on the upper end surface of each first support frame 5, and two mounting rings 7 are fixedly fitted symmetrically to the outer wall of each heat-resistant stainless steel pipe 4, with the upper ends of the lifting rods 6 fixedly connected to the outer walls of the mounting rings 7. As shown in Figure 4, the pair of symmetrically installed first support frames 5 supports the heat-resistant steel pipe 4 inside the annealing furnace 1 by the mounting rings 7 of the lifting rods 6 installed at their upper ends.

[0026] The height of the lifting rod 6 in Fig. 4 is adjustable, and because this type of lifting configuration is conventional, a description thereof will be omitted here. By installing the lifting rod 6 that can be raised and lowered, the height position of the heat-resistant steel pipe 4 can be adjusted to accommodate glass ribbons of different thicknesses.

[0027] In an embodiment of the present invention, as shown in Figures 1, 2, 5a and 5b, each cleaning part includes two second support frames 8 symmetrically fixed to the inner bottom of the annealing furnace 1, with identical mounting seats 9 fixed to the upper end surfaces of the two second support frames 8, and scrapers 10 installed in the mounting seats 9.

[0028] As shown in FIG. 1 , during the use of the boron nitride ring 3, the glass ribbon moves from left to right, or in actual production, from front to back. Some impurities inevitably adhere to the outer wall of the ring. To prevent the impurities from accumulating and becoming too large, it is necessary to limit the thickness of the impurities on the outer wall of the boron nitride ring 3 so as to avoid affecting the conveyance of the glass ribbon. In use, there is a certain gap between the scraper 10 and the outer wall of the boron nitride ring 3, and the scraper 10 is located on the left side of the boron nitride ring 3. In actual equipment, the scraper 10 is located on the front side of the boron nitride ring 3. When the boron nitride ring 3 rotates, impurities adhering to its outer wall come into contact with the scraper 10, exerting a leftward biasing force on the scraper 10. However, the scraper 10 remains stationary, allowing the impurities adhering to the outer wall of the boron nitride ring 3 to be scraped off, which is convenient.

[0029] As shown in Fig. 5a, each mounting seat 9 is suspended above two second support frames 8, and the mounting seat 9 has a hollow structure, with the scraper 10 movably passing through the mounting seat 9. The scraper 10 has a plate-like structure and is attached vertically to the mounting seat 9 in the width direction so that the scraper 10 movably passes through the mounting seat 9, with part of the lower end located within the mounting seat 9 and the upper end protruding from the upper plate of the mounting seat 9.

[0030] As shown in FIG. 5b, a lower penetration groove 11 is installed on the side wall of each mounting seat 9, and a pusher plate 12 is movably installed within the lower penetration groove 11. A scraper 10 is fixed to the upper end surface of the corresponding pusher plate 12, and the scraper 10 movably penetrates the mounting seat 9. As shown in FIG. 6, the scraper 10 is fixed vertically to the upper end surface of the corresponding pusher plate 12. A plurality of telescopic rods 13a are fixed between each lower penetration groove 11 and the pusher plate 12, and a plurality of springs 13b are fixed between the lower penetration groove 11 and the pusher plate 12, and the springs 13b are movably fitted on the outer walls of the telescopic rods. An inclined scrap block 14 is fixed to the upper end surface of each mounting seat 9. In this embodiment, the scraper 10 and the pusher plate 12 may be fixed by welding, and the lower penetration groove 11 may be a rectangular tube, and the scraper 10 is telescopically movable within the lower penetration groove 11. The inclined scrap block 14 is attached to the scraper 10, and the inclined surface of the inclined scrap block 14 may be installed on the side facing the transfer roller 2. In this embodiment, the number of telescopic rods 13a and springs 13b is not limited, and for example, there may be one on each side and one in the center, or the same number as the boron nitride rings 3 on the transfer roller 2, and the positions also correspond. As a result, the presser plate 12 is connected to the mounting seat 9 so as to be movable in the vertical direction by the multiple telescopic rods 13a and multiple springs 13b.

[0031] Both sides of each presser plate 12 movably pass through the annealing furnace 1, and presser through-holes 15 used in conjunction with the presser plates 12 are installed on both sides of the annealing furnace 1. Specifically, the positions of the presser through-holes 15 in the annealing furnace 1 may correspond to the positions of the lower through-holes 11 on the two side walls of each mounting seat 9. In this way, both sides of the presser plate 12 pass through the lower through-holes 11 and movably pass through the annealing furnace 1.

[0032] After using the scraper 10 for a certain period of time, when a certain amount of scraped impurities has adhered to its side wall, the operator can press both ends of the pusher plate 12. As the pusher plate 12 moves downward, it moves the scraper 10 downward together, and as the scraper 10 moves downward, it cooperates with the inclined scrap block 14 to scrape off the impurities adhering to the side wall of the scraper 10, which is convenient to use. As the pusher plate 12 is pressed down, the spring is pressed, and the spring contracts, accumulating elastic potential energy. After the impurities adhering to the side wall of the scraper 10 have been scraped off, the pusher plate 12 is released, and the pusher plate 12 uses the spring's elastic potential energy to press the scraper 10 back to its initial position.

[0033] In another embodiment of the present invention, as shown in FIGS. 7 and 8, the mounting seat 9 employs a guide rod 16 instead of a telescopic rod. As shown in FIG. 7, the spring 13b and guide rod 16 are mounted inside the mounting seat 9, and the scraper 10 is fixedly connected to the presser plate 12, with a portion of the scraper protruding from the upper surface of the mounting seat 9. The spring 13b is fitted onto the outside of the guide rod 16, and the presser plate 12 has a horizontal portion 121 and a vertical portion 122, with the vertical portion 122 compressing the spring 13b. In other words, the presser plate 12 in this embodiment is connected to the mounting seat 9 so as to be movable in the vertical direction by multiple guide rods 16 and multiple springs 13b. In this embodiment, the scraper 10 and the horizontal portion 121 of the presser plate 12 may be fixed by welding, the mounting seat 9 may be a rectangular tube, and the scraper 10 can be telescopically moved within the mounting seat 9 by the spring 13b.

[0034] The guide rod 16 is fixedly connected to the bottom of the mounting seat 9 by a connecting member 91. As shown in Fig. 7, the connecting member 91 may be a bolt, and the guide rod 16 may be fixedly connected to the bottom of the mounting seat 9 by two bolts.

[0035] In use, after the float glass ribbon emerges from the tin bath outlet, both edges of the glass ribbon directly contact the outer walls of the boron nitride rings 3, and the transfer rollers 2 rotate the corresponding boron nitride rings 3 to convey the glass ribbon. During this process, the hot air supply boxes deliver hot nitrogen gas to each heat-resistant steel pipe 4, which flows upward through the exhaust ports of the corresponding heat-resistant steel pipes 4, applying a biasing force to the underside of the effective width of the float glass ribbon and preventing dents from forming in the effective width of the glass ribbon. This method avoids friction between the transfer rollers 2 and the underside of the effective width of the glass ribbon during conveyance, effectively solving the problem of scratches and burrs on the underside of the float glass ribbon sheet. Furthermore, when a nitrogen gas air bearing is used, the roller table transfer device can be filled with nitrogen gas, preventing air from entering the tin bath through the tin bath outlet and reducing the generation of impurities such as tin oxide in the tin bath.

[0036] In use, there is a certain gap between the scraper 10 and the outer wall of the boron nitride ring 3, and the scraper 10 is installed on the left side of the boron nitride ring 3. As the boron nitride ring 3 rotates, impurities adhering to its outer wall come into contact with the scraper 10, exerting a leftward biasing force on the scraper 10. However, by keeping the scraper 10 stationary, the impurities adhering to the outer wall of the boron nitride ring 3 are scraped off, making it convenient to use.

[0037] After using the scraper 10 for a certain period of time, when a certain amount of scraped impurities has adhered to its side wall, the operator can press both ends of the pusher plate 12. As the pusher plate 12 moves downward, it moves the scraper 10 downward together, and as the scraper 10 moves downward, it cooperates with the inclined scrap block 14 to scrape off the impurities adhering to the side wall of the scraper 10, which is convenient to use. When the pusher plate 12 is pressed down, the spring is pressed, and the spring contracts, storing elastic potential energy. After the impurities adhering to the side wall of the scraper 10 have been scraped off, the pusher plate 12 is released, and the pusher plate 12 uses the spring's elastic potential energy to press the scraper 10 back to its initial position.

[0038] The above description is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. The annealing furnace (1) includes a plurality of transfer rollers (2) rotatably mounted on the inner wall thereof, A plurality of boron nitride rings (3) are fixedly fitted on the outer wall of each of the transfer rollers (2), and heat-resistant steel pipes (4) are installed on both sides of each transfer roller (2) in the glass ribbon conveying direction. A plurality of exhaust holes are installed on the outer wall of the heat-resistant steel pipes (4), which communicate with an external hot air supply box that supplies hot nitrogen gas. The hot nitrogen gas flows upward from the exhaust holes, applying a biasing force to the underside of the glass ribbon. The heat-resistant steel pipes (4) are used together with the transfer rollers (2) at the inner bottom of the annealing furnace (1). A plurality of cleaning components are provided, each of which includes a mounting seat (9) suspended above the second support frame (8), a scraper (10) is provided within the mounting seat (9), and an inclined scrap block (14) is fixed to the mounting seat (9) so as to be attached to the scraper (10), the inclined surface of the inclined scrap block (14) is provided on the side facing the transfer roller (2), and the scraper (10) is movable up and down relative to the inclined scrap block (14). Roller table transfer device for electronic float glass.

2. A plurality of pairs of first support frames (5) are symmetrically fixed to the inner bottom of the annealing furnace (1), and a lifting rod (6) is installed on the upper end surface of each first support frame (5). Two mounting rings (7) are symmetrically fixedly fitted on the outer wall of each heat-resistant steel pipe (4), and the upper ends of the lifting rods (6) are fixedly connected to the outer wall of the mounting rings (7). The roller table transfer device for electronic float glass according to claim 1.

3. Each of the cleaning parts includes two second support frames (8) symmetrically fixed to the inner bottom of the annealing furnace (1), and the upper end surfaces of the two second support frames (8) are provided with identical mounting seats (9). ) is fixed, The roller table transfer device for electronic float glass according to claim 1.

4. A lower penetration groove (11) is installed on the side wall of each mounting seat (9), a push-down plate (12) is movably installed in the lower penetration groove (11), and a scraper (10) is fixed to the upper end surface of the corresponding push-down plate (12), and the scraper (10) movably penetrates the mounting seat.

4. The roller table transfer device for electronic float glass according to claim 3.

5. The heat-resistant steel pipes (4) are installed on both sides of the transfer rollers (2) in the glass ribbon conveying direction, there is a certain gap between the scraper (10) and the outer wall of the boron nitride ring (3), and the scraper (10) is installed on the left side of the boron nitride ring (3).

5. The roller table transfer device for electronic float glass according to claim 4.

6. A plurality of telescopic rods (13) are fixed between each of the lower through-holes (11) and the push-down plate (12), and a plurality of springs are fixed between the lower through-holes (11) and the push-down plate (12), and the springs are movably fitted on the outer walls of the telescopic rods (13).

5. The roller table transfer device for electronic float glass according to claim 4.

7. Both sides of each of the presser plates (12) movably penetrate the annealing furnace (1), and presser-through tanks (15) used in conjunction with the presser plates (12) are installed on both sides of the annealing furnace (1).

5. The roller table transfer device for electronic float glass according to claim 4.

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