A method for adjusting the production temperature of glass and its glass production line

Abstract

The present invention relates to a method for adjusting the temperature in glass production. A laminar flow is horizontally arranged above the glass ribbon, and the moving direction of the laminar flow is parallel to the moving direction of the glass ribbon; the flow velocity of the laminar flow gradually changes from the middle to both sides thereof. A glass production line includes a group of variable-diameter rollers that are horizontally arranged above the glass ribbon at equal intervals. Both ends of the variable-diameter rollers are rotatably connected to the side walls of the furnace body through bearings, and the rotation speed of the variable-diameter rollers can be linearly changed. The present invention conducts a lateral distribution of the air flow above the glass ribbon, enabling the edge part of the glass ribbon to receive more hot air flow or less cold air flow, thereby making the transverse temperature of the glass ribbon more uniform. At the same time, the temperature fluctuation at the edge part is also reduced, making the edge temperature more stable; in the present invention, the diameter of the variable-diameter roller linearly changes from the middle to both ends, resulting in a linear change in the lateral air flow distribution from the middle to the edge part.

Description

Technical Field

[0001] The present invention belongs to the technical field of float glass production, and particularly relates to a method for adjusting the temperature of glass production and a glass production line thereof. Background Art

[0002] At present, during the movement of the glass ribbon on the float glass production line, since the two side edges of the glass ribbon are close to the side walls of the furnace body, the side edges dissipate more heat than the middle part, resulting in the temperature of the side edges of the glass ribbon being lower than that of the middle part.

[0003] The prior art usually sets electric heating above the side edges of the glass ribbon, and improves the temperature of the side edges through the intermittent operation of the electric heating. Although the temperature difference between the side edges and the middle part is reduced, the temperature of the side edges will also be in a fluctuating state of rising and falling, which is not conducive to the stable control of production. Moreover, the electric heating cannot accurately adjust the temperature difference between the side edges and the middle part. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a method for adjusting the temperature of glass production and a glass production line thereof, which can solve the problem of uneven temperature between the side edges and the middle part of the glass ribbon. The specific technical solutions are as follows:

[0005] The present invention provides a method for adjusting the temperature of glass production, which is used to adjust the transverse temperature on the surface of the glass ribbon in the furnace body of the glass production line;

[0006] A laminar flow is horizontally arranged above the glass ribbon, and the moving direction of the laminar flow is parallel to the moving direction of the glass ribbon; the flow velocity of the laminar flow gradually changes from the middle to both sides thereof to horizontally distribute the air flow above the glass ribbon.

[0007] As a preferred technical solution of the present invention, the laminar flow is divided into a first laminar flow and a second laminar flow. The first laminar flow is arranged in the tin bath section and the annealing kiln heat preservation section of the furnace body, and the second laminar flow is arranged in the annealing kiln cooling section of the furnace body;

[0008] The flow velocity of the first laminar flow gradually increases from the middle to both sides thereof; the flow velocity of the second laminar flow gradually decreases from the middle to both sides thereof.

[0009] As a preferred technical solution of the present invention, the moving direction of the first laminar flow is the same as the moving direction of the glass ribbon; the moving direction of the second laminar flow is opposite to the moving direction of the glass ribbon.

[0010] As a preferred technical solution of the present invention, in this method, the gas forming the first laminar flow comes from inside the furnace body and is recycled inside the furnace body; the gas forming the second laminar flow comes from outside the furnace body, enters from one end of the furnace body, and flows out from the other end.

[0011] As a preferred technical solution of the present invention, the edge portion of the glass ribbon in the tin bath section and the annealing kiln heat preservation section of the furnace body obtains more hot air flow than the middle portion thereof; the edge portion of the glass ribbon in the annealing kiln cooling section of the furnace body obtains less cold air flow than the middle portion thereof.

[0012] The present invention also provides a glass production line, including the glass production temperature adjustment method as described above;

[0013] The glass production line includes a group of variable-diameter rollers that span across the glass ribbon at equal intervals. Both ends of the variable-diameter rollers are rotatably connected to the side wall of the furnace body through bearings, and the rotation speed of the variable-diameter rollers can be linearly changed.

[0014] As a preferred technical solution of the present invention, the variable-diameter rollers are divided into first variable-diameter rollers and second variable-diameter rollers. The roller diameter of the first variable-diameter rollers gradually increases from the middle to both ends, and the first variable-diameter rollers are used to generate the first laminar flow; the roller diameter of the second variable-diameter rollers gradually decreases from the middle to both ends, and the second variable-diameter rollers are used to generate the second laminar flow.

[0015] As a preferred technical solution of the present invention, the distance between the lower end of the circumferential surface of the maximum roller diameter of the variable-diameter roller and the glass ribbon is 20-100 mm.

[0016] As a preferred technical solution of the present invention, among a group of the variable-diameter rollers, the distance between the circumferential surfaces of the maximum roller diameters of two adjacent variable-diameter rollers is 4-10 mm.

[0017] As a preferred technical solution of the present invention, the slope of the variable-diameter roller from the middle to one end is 1%-5%.

[0018] The beneficial effects of the present invention are:

[0019] The glass production temperature adjustment method of the present invention transversely distributes the air flow above the glass ribbon by arranging a laminar flow parallel to the moving direction of the glass ribbon above the glass ribbon and making the flow velocity of the laminar flow gradually change from the middle to both sides of the laminar flow, so that the edge portion of the glass ribbon obtains more hot air flow or less cold air flow, thereby making the transverse temperature of the glass ribbon more uniform, reducing the temperature fluctuation at the edge portion at the same time, and making the edge temperature more stable; in the glass production line of the present invention, the diameter of the variable-diameter roller linearly changes from the middle to both ends of the roller, so that the transverse air flow distribution also shows an effect of linearly changing from the middle to the edge, effectively solving the problems that the temperature of the glass ribbon in the prior art linearly decreases from the middle to the edge and the cooling rate of the glass ribbon linearly increases from the middle to the edge. Description of the Drawings

[0020] Figure 1It is the front view of the structure of the tin bath section of the furnace body in the glass production line of the present invention;

[0021] Figure 2 It is Figure 1 the side view of the structure in the X-X direction in

[0022] Figure 3 It is the front view of the structure of the heat preservation section of the annealing kiln of the furnace body in the glass production line of the present invention;

[0023] Figure 4 It is Figure 3 the side view of the structure in the Y-Y direction in

[0024] Figure 5 It is the front view of the structure of the cooling section of the annealing kiln of the furnace body in the glass production line of the present invention;

[0025] Figure 6 It is Figure 5 the side view of the structure in the Z-Z direction in

[0026] As shown in the figure: 1. Furnace body; 11. Rear retaining wall of the tin bath section; 12. Front retaining wall of the tin bath section; 13. Rear retaining wall of the heat preservation section of the annealing kiln; 14. Front retaining wall of the heat preservation section of the annealing kiln; 15. Air inlet channel; 16. Exhaust channel; 2. Electric heating; 3. First reducing roller; 4. Second reducing roller; 5. Glass ribbon; 51. First laminar flow; 52. Second laminar flow; 6. Side wall; 7. Bearing; 8. Tin bath; 9. Conveyor roller table. Detailed implementation manners

[0027] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] Embodiment 1

[0029] Combined with Figure 1 and Figure 2 shown, a glass production temperature adjustment method and its glass production line are applied to the tin bath section of the furnace body 1 in a float glass production line.

[0030] The glass ribbon 5 floats and moves on the tin bath 8. Since the two side edges of the glass ribbon 5 are close to the side wall 6 of the tin bath section of the furnace body 1, the heat dissipation of the side edges is more than that of the middle part, causing the temperature of the glass ribbon 5 to linearly decrease from the middle to the side edges. The temperature difference between the center and the edge of the glass ribbon 5 can reach 50 - 20 °C. In the prior art, electric heating 2 (shown by the dotted line in the figure) is arranged above the side edges, and the intermittent operation of the electric heating 2 is used to increase the side edge temperature. Although the temperature difference between the side edges and the middle part is reduced, the side edge temperature is in a fluctuating state of rising and falling (the temperature difference between the side edges and the middle part fluctuates within the range of 20 - 5 °C), which is not conducive to the stable control of production.

[0031] In this embodiment, the method of the present invention is applied to the narrow section of the tin bath where the heat dissipation at the edges of the glass ribbon 5 is relatively serious. A first laminar flow 51 is arranged across the upper part of the glass ribbon 5 in the narrow section, and the moving direction of the first laminar flow 51 is parallel to and the same as the moving direction of the glass ribbon 5. The flow velocity of the first laminar flow 51 gradually increases from the middle of the laminar flow (above the middle D point of the glass ribbon) to both ends (above the edge B point of the glass ribbon). The gas forming the first laminar flow 51 comes from the inside of the tin bath section of the furnace body 1 and is recycled inside the furnace body.

[0032] In this embodiment, the method for realizing the first laminar flow 51 is as follows:

[0033] A set of first variable-diameter rollers 3 is arranged across the upper part of the glass ribbon 5 at equal intervals in the tin bath section of the furnace body 1. The diameter of the first variable-diameter rollers 3 gradually increases from the middle of the rollers to both ends. Both ends of the first variable-diameter rollers 3 are rotationally connected to the side wall through bearings 7 provided on the side wall 6 of the tin bath section. One end of the first variable-diameter roller 3 is provided with a sprocket connected to a synchronous belt, and the synchronous belt is connected to a servo motor (prior art, not shown in the figure), so that the tangential velocity direction at the lower end of the first variable-diameter roller 3 is the same as the moving direction of the glass ribbon 5, and the rotational speed of the first variable-diameter roller 3 can be linearly changed;

[0034] The rotating first variable-diameter roller 3 will drive the surrounding gas to move in a circular motion, and the speed of the gas will also decrease as the distance from the roller surface increases. In this embodiment, the first variable-diameter roller 3 is 4000 mm long, the slope of the first variable-diameter roller 3 from the middle of the roller to one end of the roller is 2%, the distance H1 between the lower end (point A) of the circumferential surface of the maximum roller diameter of the first variable-diameter roller 3 and the edge (point B) of the glass ribbon 5 is 30 mm, and the distance H2 between the lower end (point C) of the circumferential surface of the minimum roller diameter of the first variable-diameter roller 3 and the middle (point D) of the glass ribbon 5 is 70 mm. Since the diameter of the first variable-diameter roller 3 gradually increases from the middle of the roller to both ends, the rotational speed VA at point A on the edge roller surface of the first variable-diameter roller 3 is greater than the rotational speed VC at point C on the middle roller surface, that is, VA > VC. The gas driven by point A around is faster than the gas driven by point C around;

[0035] At the same time, since H1 < H2, it results in that: the speed of the gas decreases more from point C to point D than from point A to point B, that is, the air flow speed VB above the edge B point of the glass ribbon 5 is greater than the air flow speed VD above the middle D point of the glass ribbon 5, that is, VB > VD, and (VB - VD) > (VA - VC). Therefore, in the same time, more hot air flows above the edge B point of the glass ribbon 5 than above the middle D point. The edge of the glass ribbon 5 can obtain more heat, which can offset the edge heat dissipation, reduce the temperature difference between the edge and the middle, make the transverse temperature of the glass ribbon 5 more uniform, and at the same time reduce the edge temperature fluctuation and make the edge temperature more stable;

[0036] Moreover, in this embodiment, the diameter of the first variable-diameter roller 3 linearly increases from the middle to both ends of the roller, so that the heat supply of the hot air flow to the glass belt 5 also shows an effect of linearly increasing from the middle to the edges, which can perfectly solve the problem that the temperature of the glass belt 5 in the prior art linearly decreases from the middle to the edges;

[0037] During production, according to the heat dissipation speed of the edges of the glass belt 5, by adjusting the rotation speed of the first variable-diameter roller 3 (a larger heat dissipation speed at the edges corresponds to a larger rotation speed of the first variable-diameter roller 3), the effect of regulating the transverse temperature of the first laminar flow 51 can be adjusted. In this embodiment, when the initial temperature difference between the middle D point and the edge B point of the glass belt is 20 °C (such as in summer), the rotation speed of the first variable-diameter roller 3 is 30 r / min. When the initial temperature difference between the middle D point and the edge B point of the glass belt 5 is 40 °C (such as in winter), the rotation speed of the first variable-diameter roller 3 is increased to 65 r / min, and the temperature difference between the edges and the middle can be stabilized within a range of 2 °C;

[0038] The hot air flow comes from the high-temperature gas inherently present in the tin bath. A set of first variable-diameter rollers 3 drives the high-temperature gas to form a first laminar flow 51 above the glass belt 5. An air flow distribution area is formed between a set of first variable-diameter rollers 3 and the glass belt 5. Through the transverse redistribution of the hot air flow by a set of first variable-diameter rollers 3, more hot air flow reaches the edges of the glass belt 5. At the same time, by controlling the distance between the rollers of a set of first variable-diameter rollers 3, in this embodiment, the distance between the circumferences of the maximum roller diameters of two adjacent first variable-diameter rollers 3 is 10 mm, so that most of the surrounding gas driven by the first variable-diameter rollers 3 moves between the first variable-diameter rollers 3 and the glass belt 5 to form a first laminar flow for heating the glass belt, while a small part of the gas makes a circular motion through the above-mentioned roller spacing. A rear retaining wall 11 of the tin bath section is arranged on one side of the last first variable-diameter roller 3, and a front retaining wall 12 of the tin bath section is arranged on one side of the first first variable-diameter roller 3. After the first laminar flow 51 reaches the last first variable-diameter roller 3, it is blocked by the rear retaining wall 11 of the tin bath section and returns above the first first variable-diameter roller 3 from above a set of first variable-diameter rollers 3. After being blocked by the front retaining wall 12 of the tin bath section, it enters between a set of first variable-diameter rollers 3 and the glass belt 5 again to form a circulating first laminar flow 51.

[0039] Embodiment Two

[0040] Combined with Figure 3 and Figure 4 As shown, a glass production temperature adjustment method and its glass production line are applied to the annealing kiln insulation section of the furnace body 1 in the float glass production line.

[0041] The glass ribbon 5 moves on the conveying roller path 9 in the heat preservation section of the annealing furnace. Since the two side edges of the glass ribbon 5 are close to the side walls 6 of the heat preservation section of the annealing furnace, more heat is dissipated from the side edges than from the middle part, causing the temperature of the glass ribbon 5 to linearly decrease from the middle to the side edges. The extreme temperature difference between the center and the edges of the glass ribbon 5 may reach 50 - 20 °C. In the prior art, intermittent electric heating 2 (shown by the dashed line in the figure) is arranged above the side edges to increase the side edge temperature. Although the temperature difference between the side edges and the middle part is reduced, the side edge temperature is in a fluctuating state of rising and falling (the temperature difference between the edge and the center fluctuates between 20 - 10 °C), which is not conducive to the stable control of production.

[0042] In this embodiment, the method of the present invention is applied to the heat preservation section of the annealing furnace of the furnace body 1 in the float glass production line. A first laminar flow 51 whose moving direction is parallel and the same as that of the glass ribbon 5 is arranged across the upper part of the glass ribbon 5 in the heat preservation section of the furnace body 1. The flow velocity of the first laminar flow 51 gradually increases from the middle to both ends of the laminar flow. The gas forming the first laminar flow 51 comes from the inside of the heat preservation section of the annealing furnace of the furnace body 1 and is recycled inside the furnace body 1.

[0043] In this embodiment, the method to realize the first laminar flow 51 is as follows:

[0044] A group of first variable - diameter rollers 3 are arranged at equal intervals across the upper part of the glass ribbon 5 in the heat preservation section of the furnace body 1. The diameter of the first variable - diameter roller 3 gradually increases from the middle to both ends of the roller. Both ends of the first variable - diameter roller 3 are rotationally connected to the side wall through bearings 7 arranged on the side walls 6 of the heat preservation section of the annealing furnace. One end of the first variable - diameter roller 3 is provided with a sprocket connected to a synchronous belt, and the synchronous belt is connected to a servo motor (prior art, not shown in the figure), so that the tangential velocity direction at the lower end of the first variable - diameter roller 3 is consistent with the moving direction of the glass ribbon 5, and the rotational speed of the first variable - diameter roller 3 can be linearly changed;

[0045] Since the diameter of the first variable - diameter roller 3 gradually increases from the middle to both ends of the roller, based on the same mechanism as in Embodiment 1, a group of first variable - diameter rollers 3 enables the side edges of the glass ribbon 5 to obtain more heat, offsetting the heat dissipation at the side edges, thereby reducing the temperature difference between the side edges and the middle part and making the transverse temperature of the glass ribbon 5 more uniform; at the same time, the temperature fluctuation at the side edges is also reduced, making the side edge temperature more stable;

[0046] Moreover, in this embodiment, the diameter of the first variable - diameter roller 3 linearly increases from the middle to both ends of the roller, so that the heat supply of the hot air flow to the glass ribbon 5 also shows an effect of linearly increasing from the middle to the side edges, which can perfectly solve the problem that the temperature of the glass ribbon 5 in the prior art linearly decreases from the middle to the side edges;

[0047] During production, according to the heat dissipation speed of the side edges of the glass ribbon 5, by adjusting the rotational speed of the first variable - diameter roller 3 (a larger rotational speed of the first variable - diameter roller corresponds to a larger heat dissipation speed at the side edges), the effect of the first laminar flow 51 in regulating the transverse temperature can be adjusted.

[0048] The hot air flow comes from the heating of the air in this section by the high-temperature glass ribbon 5 in the heat preservation section of the annealing kiln of the furnace body 1. A set of first stepped rollers 3 drives the high-temperature gas to form a first laminar flow 51 above the glass ribbon 5. An air flow distribution area is formed between the set of first stepped rollers 3 and the glass ribbon 5. The hot air flow is laterally redistributed by the set of first stepped rollers 3, so that the edge part of the glass ribbon 5 receives more hot air flow. At the same time, by controlling the distance between the first stepped rollers 3, in this embodiment, the distance between the circumferences of the maximum roller diameters of two adjacent first stepped rollers 3 is 6 mm, so that most of the gas driven by the first stepped rollers 3 moves between the first stepped rollers 3 and the glass ribbon 5 to form a first laminar flow 51 to heat the glass ribbon 5, while a small part of the gas makes a circular motion through the above-mentioned roller spacing; an after retaining wall 13 of the heat preservation section of the annealing kiln is arranged on one side of the last first stepped roller 3, and a front retaining wall 14 of the heat preservation section of the annealing kiln is arranged on one side of the first first stepped roller. After the first laminar flow 51 reaches the last first stepped roller 3, it is blocked by the after retaining wall 13 of the heat preservation section of the annealing kiln and returns above the first first stepped roller 3 from above the set of first stepped rollers 3. After being blocked by the front retaining wall 14 of the heat preservation section of the annealing kiln, it enters between the set of first stepped rollers 3 and the glass ribbon 5 again to form a circulating first laminar flow 51.

[0049] Embodiment III

[0050] Combined with Figure 5 and Figure 6 as shown, a glass production temperature adjustment method and its glass production line are applied to the cooling section of the annealing kiln of the furnace body 1 in a float glass production line.

[0051] The glass ribbon 5 moves on the conveying roller path 9 in the cooling section of the annealing kiln of the furnace body 1. The process requires the glass ribbon 5 to cool down synchronously in the transverse direction. However, under the existing technical conditions, the two side edges of the glass ribbon 5 are close to the side wall 6 of the cooling section of the annealing kiln, so that the edges dissipate more heat than the middle part, resulting in the edge part of the glass ribbon 5 cooling faster than the middle part. The cooling rate of the glass ribbon 5 linearly decreases from the edge to the middle in the transverse direction. In the prior art, intermittent electric heating 2 (shown by the dotted line in the figure) is arranged above the edge part to reduce the cooling rate of the edge part. Although the difference in the cooling rates between the edge part and the middle part is reduced, the macroscopic transverse temperature difference is still 20 - 5 °C, and the temperature of the edge part of the glass ribbon 5 is in a fluctuating state of rising and falling, which is not conducive to the stable control of production.

[0052] The present invention provides a second laminar flow 52 above the glass ribbon 5, whose moving direction is parallel to and opposite to the moving direction of the glass ribbon 5. The flow velocity of the second laminar flow 52 gradually decreases from the middle of the laminar flow (above the middle point K of the glass ribbon 5) to both ends (above the edge point F of the glass ribbon 5). The gas forming the second laminar flow 52 comes from the outside of the cooling section of the annealing kiln of the furnace body 1, enters from one end of the furnace body 1 and flows out from the other end.

[0053] In this embodiment, the method for implementing the second layer of flow 52 is as follows:

[0054] A set of second variable-diameter rollers 4 are arranged at equal intervals across the upper part of the glass belt 5 in the cooling section of the annealing kiln of the furnace body 1. The diameter of the second variable-diameter rollers 4 gradually decreases from the middle of the rollers to both ends. Both ends of the second variable-diameter rollers 4 are rotationally connected to the side wall through bearings 7 provided on the side wall 6 of the cooling section of the annealing kiln (prior art, not shown in the figure), so that the tangential velocity direction at the lower end of the second variable-diameter rollers 4 is opposite to the moving direction of the glass belt 5, and the rotational speed of the second variable-diameter rollers 4 can be linearly changed;

[0055] The rotating second variable-diameter rollers 4 will drive the surrounding gas to make a circular motion, and the speed of the gas will also decrease as the distance from the roller surface increases. In this embodiment, the length of the second variable-diameter rollers 4 is 4000 mm, the slope of the second variable-diameter rollers 4 from the middle of the rollers to one end of the rollers is 3%, the distance H3 between the lower end (point E) of the circumferential surface of the smallest roller diameter of the second variable-diameter rollers 4 and the edge (point F) of the glass belt 5 is 100 mm, and the distance H4 between the lower end (point G) of the circumferential surface of the largest roller diameter of the second variable-diameter rollers 4 and the middle (point K) of the glass belt 5 is 40 mm. Since the diameter of the second variable-diameter rollers 4 gradually decreases from the middle of the rollers to both ends, the rotational speed VE at point E on the edge roller surface of the second variable-diameter rollers 4 is smaller than the rotational speed VG at point G on the middle roller surface, that is, VG > VE. The gas driven by point G around is faster in flow rate than the gas driven by point E;

[0056] At the same time, since H3 > H4, it results in: the speed of the gas decreases more from point E to point F than from point G to point K, that is, the air flow speed VF above the edge F point of the glass belt 5 is less than the air flow speed VK above the middle K point of the glass belt 5, that is, VK > VF, and (VK - VF) > (VG - VE). Therefore, in the same time, more cold air flows above the middle K point than above the edge F point of the glass belt 5. More heat can be dissipated from the middle of the glass belt 5, thereby reducing the cooling speed at the edge, reducing the difference in the cooling speed between the edge and the middle, enabling the middle and the edge of the glass belt 5 to be cooled synchronously in a controlled manner, making the transverse temperature of the glass belt 5 more uniform, and at the same time reducing the temperature fluctuation at the edge, making the edge temperature more stable;

[0057] Moreover, in this embodiment, the diameter of the second variable-diameter rollers 4 linearly decreases from the middle of the rollers to both ends, so that the cooling speed of the cold air flow on the glass belt 5 also shows a linear decrease effect from the middle to the edge, which can perfectly solve the problem that the cooling speed of the glass belt 5 in the prior art linearly increases from the middle to the edge;

[0058] During production, according to the heat dissipation speed of the edge of the glass ribbon 5, the effect of regulating the transverse temperature by the second layer of laminar flow 52 can be adjusted by adjusting the rotation speed of the second variable-diameter roller 4 (a larger heat dissipation speed at the edge corresponds to a larger rotation speed of the second variable-diameter roller 4). In this embodiment, when the initial temperature difference between the central point K and the edge point F of the glass ribbon 5 is 30 °C (such as in summer), the rotation speed of the second variable-diameter roller 4 is 40 r / min. When the initial temperature difference between the central point K and the edge point F of the glass ribbon is 50 °C (such as in winter), the rotation speed of the second variable-diameter roller 4 is increased to 75 r / min, and the temperature difference between the edge and the center can be stabilized within the range of 3 °C.

[0059] The cold air flow comes from the normal-temperature air outside the annealing kiln cooling section of the furnace body 1. The normal-temperature air enters the furnace body through the air intake channel 15 with a top opening on one side of the last second variable-diameter roller 4, and then is driven by a group of second variable-diameter rollers 4 to form a second layer of laminar flow 52 above the glass ribbon 5. An air flow distribution area is formed between a group of second variable-diameter rollers 4 and the glass ribbon 5. Through the lateral redistribution of the normal-temperature air by a group of second variable-diameter rollers 4, the edge of the glass ribbon 5 receives less cold air flow. At the same time, by controlling the spacing between each second variable-diameter roller 4, in this embodiment, the distance between the circumferences of the maximum roller diameters of two adjacent second variable-diameter rollers 4 is 4 mm, so that most of the gas driven by the second variable-diameter roller 4 moves between the second variable-diameter roller 4 and the glass ribbon 5 to form a second layer of laminar flow 52 to implement the cooling heat of the glass ribbon 5, while a small part of the cold air flow makes a circular motion through the above-mentioned roller spacing. After the second layer of laminar flow 52 passes over the last first second variable-diameter roller 4, it flows out of the furnace body 1 through the exhaust channel 16 with a top opening on one side of the first second variable-diameter roller 4.

[0060] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for adjusting the temperature of glass production, characterized in that, this method is used to adjust the lateral temperature on the surface of the glass ribbon in the furnace body of the glass production line; this method includes setting electric heating above the edges of the glass ribbon in the tin bath section and the annealing kiln heat preservation section of the furnace body, and horizontally arranging a first laminar flow above the glass ribbon in the tin bath section and the annealing kiln heat preservation section of the furnace body. The gas forming the first laminar flow comes from inside the furnace body and is recycled inside the furnace body; the moving direction of the first laminar flow is the same as the moving direction of the glass ribbon; the flow velocity of the first laminar flow gradually increases from its middle to its two edges; the first laminar flow enables the edges of the glass ribbon in the tin bath section and the annealing kiln heat preservation section of the furnace body to obtain more hot air flow than its middle part.

2. A method for adjusting the temperature of glass production according to claim 1, characterized in that: this method further includes horizontally arranging a second laminar flow above the glass ribbon in the annealing kiln cooling section of the furnace body. The gas forming the second laminar flow comes from outside the furnace body, enters from one end of the furnace body, and flows out from the other end; the moving direction of the second laminar flow is opposite to the moving direction of the glass ribbon; the flow velocity of the second laminar flow gradually decreases from its middle to its two edges; the second laminar flow enables the edges of the glass ribbon in the annealing kiln cooling section of the furnace body to obtain less cold air flow than its middle part.

3. A glass production line, characterized in that: including the method for adjusting the temperature of glass production according to claim 2; this glass production line includes a group of variable-diameter rollers horizontally arranged at equal intervals above the glass ribbon in the tin bath section and the annealing kiln heat preservation section of the furnace body and above the glass ribbon in the annealing kiln cooling section of the furnace body. Both ends of the variable-diameter rollers are rotatably connected to the side wall of the furnace body through bearings, and the rotation speed of the variable-diameter rollers can be linearly changed; the variable-diameter rollers are divided into first variable-diameter rollers and second variable-diameter rollers; the first variable-diameter rollers are located in the tin bath section and the annealing kiln heat preservation section of the furnace body, the roller diameter of the first variable-diameter rollers gradually increases from its middle to both ends, and the first variable-diameter rollers are used to generate the first laminar flow; the second variable-diameter rollers are located in the annealing kiln cooling section of the furnace body, the roller diameter of the second variable-diameter rollers gradually decreases from its middle to both ends, and the second variable-diameter rollers are used to generate the second laminar flow.

4. A glass production line according to claim 3, characterized in that: the distance between the lower end of the circumferential surface of the maximum roller diameter of the variable-diameter roller and the glass ribbon is 20 - 100 mm.

5. A glass production line according to claim 3, characterized in that: among a group of the variable-diameter rollers, the distance between the circumferential surfaces of the maximum roller diameter of two adjacent variable-diameter rollers is 4 - 10 mm.

6. A glass production line according to claim 3, characterized in that: the slope of the variable-diameter roller from its middle to one end is 1% - 5%.

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