CN106064878B - Float glass manufacturing device and float glass manufacturing method - Google Patents
Float glass manufacturing device and float glass manufacturing method Download PDFInfo
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- CN106064878B CN106064878B CN201610245204.0A CN201610245204A CN106064878B CN 106064878 B CN106064878 B CN 106064878B CN 201610245204 A CN201610245204 A CN 201610245204A CN 106064878 B CN106064878 B CN 106064878B
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- float glass
- glass
- molten metal
- iron plate
- plate portion
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B18/00—Shaping glass in contact with the surface of a liquid
- C03B18/02—Forming sheets
- C03B18/16—Construction of the float tank; Use of material for the float tank; Coating or protection of the tank wall
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B18/00—Shaping glass in contact with the surface of a liquid
- C03B18/02—Forming sheets
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B18/00—Shaping glass in contact with the surface of a liquid
- C03B18/02—Forming sheets
- C03B18/20—Composition of the atmosphere above the float bath; Treating or purifying the atmosphere above the float bath
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B25/00—Annealing glass products
- C03B25/04—Annealing glass products in a continuous way
- C03B25/06—Annealing glass products in a continuous way with horizontal displacement of the glass products
- C03B25/08—Annealing glass products in a continuous way with horizontal displacement of the glass products of glass sheets
Abstract
The invention provides a float glass manufacturing device and a float glass manufacturing method, which can inhibit pressure fluctuation in a molten metal tank and a scum box or invasion of external air and can contribute to manufacturing of high-quality thin glass. A float glass manufacturing device is provided with: a molten metal bath for containing molten metal; a slow cooling furnace into which a glass ribbon formed into a ribbon shape on a molten metal is conveyed; the scum box is arranged between the metal liquid tank and the slow cooling furnace; and a curtain provided in the dross box and disposed above a plurality of lift rollers for conveying the glass ribbon from the molten metal bath to the slow cooling furnace, wherein the curtain is provided with a reinforcing means on the downstream side in the conveying direction of the glass ribbon.
Description
Technical Field
The present invention relates to a float glass manufacturing apparatus and a float glass manufacturing method.
Background
As one of typical methods for producing sheet glass, a float process is known. In the float process, molten glass is continuously supplied to a bath surface of molten metal in a molten metal bath to form a glass ribbon in a ribbon shape. After being lifted from the bath surface, the glass ribbon is drawn out from an outlet of the molten metal bath and conveyed by lift rollers disposed in the dross box. Next, the glass ribbon is conveyed into a slow cooling furnace, and is slowly cooled while being conveyed by conveying rollers (slow cooling rollers). Next, the glass ribbon is carried out of the slow cooling furnace, cooled to a temperature near room temperature, and then cut into a predetermined size to obtain a glass plate as a product. Molten tin is generally used as the molten metal.
Tin is a monomer, and is oxidized to tin oxide (SnO) when the temperature is high in an atmosphere in which oxygen is present2). In a float glass manufacturing apparatus comprising a float bath, a dross box, a slow cooling furnace, etc., molten tin at a high temperature is oxidized by oxygen entering the inside of the float bath to generate tin oxide, which is problematic in that it adheres to the surface of the glass ribbon. In view of this, a reducing gas, for example, hydrogen, nitrogen, or a reducing mixed gas of hydrogen and nitrogen, is supplied into the metal bath, and the inside of the metal bath is made positive in pressure by the external gas, thereby excluding the intrusion of the external gas containing oxygen.
The reducing mixed gas from the liquid metal bath is required to be supplied to a dross box provided between the liquid metal bath and the slow cooling furnace, and the inside of the dross box is maintained at atmospheric pressure or higher, thereby maintaining an environment in which the formation and adhesion of tin oxide are prevented.
However, external air containing oxygen enters from a gap or the like on the slow cooling furnace side of the dross box, the pressure in the dross box fluctuates, and tin oxide is generated and adheres to the surface of the glass ribbon in the dross box. Thus, the produced plate glass is deteriorated in quality due to defects such as peeling and deformation.
In recent years, thin plate glass is used for televisions, smart phones, and the like, and if there is a slight defect on the surface of such thin plate glass, the strength is directly deteriorated.
In view of the above problems, there is a technique of disposing a metal curtain called a curtain at a position above the lift roller of the dross box in order to prevent pressure fluctuations in the molten metal bath and the dross box and intrusion of external air containing oxygen (see, for example, patent document 1).
[ Prior Art document ]
[ patent document ]
[ patent document 1 ] Japanese patent application laid-open No. 2001-146433
[ problem to be solved by the invention ]
However, the technique of patent document 1 has the following problems.
The upstream side surface of the curtain in the conveying direction of the glass ribbon is in a state of always receiving the pressure from the molten metal tank. Therefore, the curtain undergoes buckling deformation in which the surface on the downstream side in the conveying direction of the glass ribbon bulges with the passage of time.
Then, the pressure in the liquid metal tank and the dross box fluctuates, or the outside air is allowed to enter, and the produced sheet glass has defects and the quality is degraded.
Disclosure of Invention
The present invention has been made in view of the above problems, and provides a float glass manufacturing apparatus capable of suppressing pressure fluctuations in a float bath and a float bath tank and intrusion of outside air, and contributing to manufacturing of high-quality thin glass.
[ MEANS FOR solving PROBLEMS ] A method for solving the problems
In order to solve the above problem, according to an aspect of the present invention, there is provided a float glass manufacturing apparatus including: a molten metal bath for containing molten metal; a slow cooling furnace into which a glass ribbon formed into a ribbon shape on the molten metal is conveyed; the scum box is arranged between the metal liquid tank and the slow cooling furnace; and a curtain provided in the dross box and disposed above a plurality of lift rollers for conveying the glass ribbon from the molten metal bath to the slow cooling furnace,
the manufacturing device of the float glass is characterized in that,
the curtain is provided with a reinforcing unit on the downstream side in the conveying direction of the glass ribbon.
[ Effect of the invention ]
According to an aspect of the present invention, it is possible to provide a float glass manufacturing apparatus that suppresses pressure fluctuations in the float bath and the float bath tank and intrusion of outside air, and contributes to manufacturing of high-quality thin glass.
Drawings
Fig. 1 is a partial sectional view of a float glass manufacturing apparatus according to a first embodiment of the present invention.
Fig. 2 is a schematic configuration diagram of a screen constituting a float glass manufacturing apparatus according to a first embodiment of the present invention, where (a) is an I-I sectional view of (B), and (B) is a front view of the screen.
Fig. 3 is a schematic configuration diagram of a screen constituting a float glass manufacturing apparatus according to a second embodiment of the present invention, where (a) is a sectional view taken along line II-II of (B), and (B) is a front view of the screen.
Fig. 4 is a schematic configuration diagram of a modification of a screen constituting a float glass manufacturing apparatus according to a second embodiment of the present invention, where (a) is a sectional view taken along line III-III of (B), and (B) is a front view of the screen.
FIG. 5 is a graph showing the results of the experiments in comparative examples and examples.
[ Mark Specification ]
1 float glass manufacturing device
2 glass ribbon
10 molten metal bath
11 molten metal
12 bath noodles
13 outlet
18 heating device
20 slow cooling furnace
21 conveying roller
23 inlet
28 heater
30 scum box
31 outer wall
32 inner wall
33. 34 Heat insulation element
35 to 38 spaces
39 outlet port
4 lifting roller
5 contact member
6. 600 curtain
60 frame part
60A, 60B, 600A, 600B frame member
61. 610 corrugated iron plate part
601B opening part
602B extension
62 reinforcing unit (deformation prevention plate)
620 reinforcing unit
7 Heater
Detailed Description
Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the drawings, the same or corresponding components are denoted by the same or corresponding reference numerals, and description thereof is omitted. In the present specification, "to" indicating a numerical range means a range including the numerical values before and after it. In the following description, the "downstream side" refers to the downstream side in the conveyance direction of the glass ribbon, and the "upstream side" refers to the upstream side in the conveyance direction of the glass ribbon.
[ first embodiment ]
(float glass manufacturing apparatus)
Fig. 1 is a partial sectional view of a float glass manufacturing apparatus according to a first embodiment of the present invention. As shown in FIG. 1, an apparatus 1 for manufacturing float glass comprises a float bath 10, a slow cooling furnace 20, and a dross box 30 provided between the float bath 10 and the slow cooling furnace 20.
The glass ribbon 2 formed to a desired width or thickness on the bath surface 12 of the molten metal 11 in the molten metal bath 10 is lifted from the bath surface 12 by the traction force of the lift rollers 4 or the conveying rollers 21. Then, the glass ribbon 2 is carried into the dross box 30 from the outlet 13 of the molten metal bath 10 and carried by the lift roller 4. Next, the glass ribbon 2 is carried into the slow cooling furnace 20 and slowly cooled while being conveyed by the conveying rollers (slow cooling rollers) 21. Then, the glass ribbon 2 is carried out of the annealing furnace 20, cooled to a temperature near room temperature, and then cut into a predetermined size to obtain a glass sheet as a product.
The glass used for the glass plate is appropriately selected depending on the use of the glass plate and the like. For example, when the glass plate is used as a glass substrate for a plasma display, glass having a high strain point temperature and a high thermal expansion coefficient is used. In addition, when the glass plate is used as a glass substrate for a liquid crystal display, alkali metals adversely affect the quality of the liquid crystal display, and therefore, alkali-free glass containing substantially no alkali metals is used. Here, "alkali-free glass" means that Li is not intentionally contained2O、Na2O、K2And alkali metal oxide glasses such as O.
The molten metal bath 10 contains molten metal 11. The upper space in the molten metal bath 10 is filled with a reducing mixed gas containing nitrogen and hydrogen in order to prevent oxidation of the molten metal 11. The upper space in the float bath 10 is set to be higher than the atmospheric pressure in order to prevent the inflow of air from the outside. The reducing atmosphere flows out from an outlet 13 of the molten metal bath 10 from which the glass ribbon 2 is drawn toward the dross box 30. A heater 18 for adjusting the temperature of the glass ribbon 2 to be plastically deformable is provided in the vicinity of the outlet 13 in the molten metal bath 10.
The outlet of the slow cooling furnace 20 on the downstream side is open to the outside. Therefore, the interior of the slow cooling furnace 20 is substantially an atmosphere containing oxygen. The interior of the slow cooling furnace 20 communicates with the interior of the molten metal bath 10 via the interior of the dross box 30.
The annealing furnace 20 is provided with a heater 28 and the like in addition to the conveying roller 21. The conveyance rollers 21 are driven to rotate by a driving device such as a motor, and convey the glass ribbon 2 in the horizontal direction by the driving force.
The dross box 30 may have an insulating structure, for example, as shown in FIG. 1, at least a part of the outer wall 31 of the upper part is covered with an insulating material 33, and at least a part of the inner wall 32 of the lower part is covered with an insulating material 34. The heat insulators 33 and 34 are generally structured. By using the heat insulators 33 and 34, heat dissipation from the dross box 30 can be suppressed, the temperature distribution of the glass ribbon 2 can be stabilized, and warping of the product can be suppressed.
In addition to the above-described lift roller 4 (hereinafter, also simply referred to as "roller 4"), a contact member 5, a curtain 6, a heater 7, and the like are provided in the dross box 30. The rollers 4 are driven to rotate by a driving device such as a motor, and the glass ribbon 2 is conveyed obliquely upward by the driving force. The number of the rollers is not particularly limited as long as it is plural. A contact member 5 is provided at the lower portion of the roller 4.
The contact member 5 is formed of carbon or the like. The contact members 5 are in sliding contact with the outer peripheral surfaces of the corresponding rollers 4, and divide the space below the glass ribbon 2 into a plurality of spaces 35 to 38.
The curtain 6 is a shielding wall provided above the glass ribbon 2 and above the roller 4 to shield the space above the glass ribbon 2. In the space above the glass ribbon 2, the reducing mixed gas flowing out from the outlet 13 of the molten metal bath 10 flows toward the inlet 23 of the annealing furnace 20 (the outlet 39 of the dross box 30).
The curtain 6 restricts the intrusion of oxygen from the annealing furnace 20, and suppresses the increase in the oxygen concentration in the dross box 30. This can suppress the combustion of hydrogen in the reducing mixed gas, and can suppress the temperature fluctuation or local heating caused by the hydrogen combustion flame. The curtain 6 is disposed slightly apart (for example, 1cm) from the upper surface of the glass ribbon 2 so as not to interfere with the conveyance of the glass ribbon 2. The plurality of curtains 6 are hung by the outer wall 31 and are provided along the conveying direction of the glass ribbon 2.
The float glass manufacturing apparatus 1 of the present embodiment is advantageous in the structure of the screen 6 described above, and particularly has a structure capable of preventing the screen 6 from bulging to the downstream side and buckling deformation. This point will be described later.
The heaters 7 are provided separately on both upper and lower sides of the glass ribbon 2, and are provided in a plurality of rows along the conveyance direction of the glass ribbon 2. As shown in fig. 1, for example, the heaters 7 of the respective rows are disposed between the curtains 6 or between the contact members 5. The heaters 7 of each column may be divided along the width direction of the glass ribbon 2.
(curtain)
Next, the screen 6 constituting the float glass manufacturing apparatus 1 according to the first embodiment will be described in detail with reference to the drawings. Fig. 2 shows a schematic structure of the curtain. Fig. 2A is a sectional view taken along line I-I of fig. 2B, and fig. 2B is a front view of the shade. In short, fig. 2B is a front view seen from the downstream side with respect to the conveyance direction of the glass ribbon 2.
The curtain 6 has a frame portion 60 and a corrugated iron plate portion 61. The frame portion 60 has 2 frame members 60A and 60B for sandwiching and supporting the top and back surfaces of the corrugated iron plate portion 61. The frame member 60A is disposed on the upstream side (front surface) of the corrugated iron plate portion 61, and the frame member 60B is disposed on the downstream side (rear surface) of the corrugated iron plate portion 61. The frame members 60A and 60B are angle steel members made of stainless steel, and are continuously arranged in the longitudinal direction at the upper position of the corrugated iron plate portion 61, and bolts 8 can be screwed into bolt holes provided at a predetermined interval to clamp the upper portion of the corrugated iron plate portion 61. The frame members 60A, 60B have a thickness of 2.5mm to 3.5mm, preferably about 3mm, and a height (length) of 80mm to 100mm, preferably about 93 mm.
The corrugated iron plate portion 61 is a corrugated iron plate made of stainless steel and having a corrugated shape, and is made of a thin material having a thickness of 0.1mm to 0.2mm, preferably about 0.15 mm. By forming the screen 6 of the present embodiment to have the corrugated iron plate portion 61, it is lightweight and can exhibit a certain degree of rigidity, and deformation can be tolerated against a large external pressure.
That is, the curtain 6 can exhibit a certain degree of rigidity to the reducing mixed gas supplied from the molten metal bath 10 due to the corrugated shape of the corrugated iron plate. The glass ribbon 2 is conveyed to a position just below the lower end of the curtain 6. There is only a slight (e.g., 1cm) gap between the curtain 6 and the glass ribbon 2, and therefore, when a crack is generated in the glass ribbon 2 and the cracked glass (cullet) travels on the upper surface of the glass ribbon 2, it comes into contact with the lower end portion of the curtain 6. At this time, if the rigidity of the screen 6 is high, the conveyance flow of the glass ribbon 2 is stopped, and the production of float glass by the production apparatus 1 must be stopped. However, by using the corrugated iron plate portion 61 that is thin and thick, even if cullet on the glass ribbon 2 comes into contact with the lower end portion of the corrugated iron plate portion 61, the cullet is positively deformed without preventing conveyance flow.
Even in this case, if the reducing mixed gas supplied from the molten metal bath 10 is endured only by the corrugated iron plate portion 61, the downstream side surface bulges and deforms immediately with the passage of time or the like.
Therefore, the curtain 6 of the present embodiment has a feature that the reinforcing means 62 is provided on the downstream side in the conveying direction of the glass ribbon 2.
The reinforcing means 62 (corresponding to the deformation preventing plates) is provided in plurality at intervals along the width direction (longitudinal direction) of the shade 6. The deformation preventing plate 62 is a long and thin stainless steel plate having a width of 30mm to 50mm, preferably about 40mm, and has a thickness of 2mm to 4mm, preferably about 3 mm. That is, the deformation preventing plate 62 is formed thicker than the corrugated iron plate portion 61 to ensure rigidity and support force. The height (length) is appropriately changed depending on the relationship of the length of the corrugated iron plate portion 61, but the lower end of the deformation preventing plate 62 preferably has a height higher than the lower end of the corrugated iron plate portion 61 by 80mm to 120mm, preferably by about 100 mm.
The deformation preventing plate 62 having the above-described structure is provided with a through hole at an upper position thereof, which is aligned with the bolt hole provided in the frame members 60A and 60B in common, and is attached to the frame member 60B by screwing the bolt 8 into the through hole and the bolt holes. The lower end portion of the deformation preventing plate 62 is not particularly connected to the corrugated iron plate portion 61 by welding or the like. Of course, the connection may be made by welding or the like as appropriate. The deformation preventing plates 62 are provided at intervals L of about 250mm to 350mm in the longitudinal direction of the continuous frame member 60B. The spacing L is more preferably 300 mm.
In the curtain 6 having the above-described configuration, the plurality of deformation preventing plates 62 prevent bulging deformation of the downstream side (back) even if the reducing mixed gas is continuously received on the upstream side (front) of the corrugated iron plate portion 61.
Therefore, according to the method for producing float glass using the apparatus 1 for producing float glass having the screen 6 of the above-described configuration, it is possible to suppress pressure fluctuations in the float bath and intrusion of outside air, to keep the pressure in the float bath 30 within a target value, and to contribute to production of high-quality sheet glass. Further, since the deformation of the curtain 6 can be suppressed, adjustment work, replacement, and the like associated with the deformation of the curtain are not necessary, and production loss during this time can be prevented, and the work efficiency and the economical efficiency are excellent.
The deformation preventing plate 62 (reinforcing means) has a thickness of 2mm to 4mm, preferably about 3mm, which is tolerable for the conveying force of the glass ribbon 2. The relationship between the lower end of the deformation preventing plate 62 and the lower end of the corrugated iron plate portion 61 is such that the lower end of the deformation preventing plate 62 is disposed above the lower end of the corrugated iron plate portion 61. Therefore, even if the cullet on the glass ribbon 2 comes into contact with the lower end portion of the corrugated iron plate portion 61, the cullet can be positively deformed to prevent the conveyance flow from being blocked.
[ second embodiment ]
Next, an apparatus for manufacturing float glass according to a second embodiment of the present invention will be described. The present embodiment has substantially the same technical idea as the first embodiment, and the following description focuses on differences thereof. In a straightforward manner, the reinforcing elements of the shade are structurally different. The thickness of each member is the same, and the like.
Fig. 3 shows a schematic structure of a screen constituting a float glass manufacturing apparatus according to a second embodiment. Fig. 3A is a sectional view taken along line II-II of fig. 3B, and fig. 3B is a front view of the shade. In short, fig. 3B is a front view seen from the downstream side with respect to the conveyance direction of the glass ribbon 2.
The shade 600 of the second embodiment has a reinforcing unit 620. The reinforcing unit 620 is configured such that the frame member 600B disposed on the downstream side in the conveyance direction of the glass ribbon 2 is formed longer than the frame member 600A disposed on the upstream side in the conveyance direction of the glass ribbon.
That is, the frame member 600B disposed on the downstream side (back side) of the corrugated iron plate portion 610 has the same height (length) as the deformation preventing plate 62. The height is 240mm to 300mm, preferably about 270 mm. The lower end of the frame member 600B and the lower end of the corrugated iron plate portion 610 may be arranged such that the lower end of the frame member 600B is 80mm to 120mm, preferably about 100mm, from the lower end of the corrugated iron plate portion 610. Therefore, even if the cullet of the glass ribbon 2 comes into contact with the lower end portion of the corrugated iron plate portion 610, the cullet can be positively deformed to prevent the conveyance flow from being stopped.
The frame member 600B constituting the reinforcing unit 620 has a plurality of openings 601B formed at substantially the center height position at regular intervals in the longitudinal direction (width direction). The opening 601B can reduce the weight of the curtain 600.
The number of the screens 600 constituting the apparatus for manufacturing float glass according to the second embodiment is smaller than that of the first embodiment, and the assembling work is simple. Further, since the area of the reinforcing element 620 in contact with the downstream side surface of the corrugated iron plate portion 610 is larger than the reinforcing element 62 according to the first embodiment, the downstream side surface of the corrugated iron plate portion 610 can be prevented from bulging deformation or the like for a long period of time. It goes without saying that the effects described in the first embodiment can be similarly achieved.
(modification example)
The second embodiment is not limited to this, and may have a modification example shown in fig. 4. Fig. 4 shows a modification of the screen constituting the float glass manufacturing apparatus according to the second embodiment. Fig. 4A is a sectional view in the direction III-III of fig. 4B, and fig. 4B is a front view of the shade. In short, fig. 4B is a front view seen from the downstream side with respect to the conveyance direction of the glass ribbon 2.
That is, the shade 600 has extensions 602B at one side end portion or both side end portions so that the lower end of the frame member 600B is at the same height as the lower end of the corrugated iron plate portion 610.
As a general example, the glass ribbon 2 directly below the curtain 600 is narrower than the width of the curtain 600, and the glass ribbon 2 is not present at positions directly below both side end portions of the curtain 600. That is, the conveyance stop of the glass ribbon 2 may not be considered much at both side end portions. Therefore, the extension 602B is formed at the frame member 600B at both side end portions to have the same height as the lower end of the corrugated iron plate portion 610, whereby the shielding rate in the dross box 30 can be further improved.
(method for producing float glass)
The method for manufacturing float glass according to the present embodiment may be the same as the conventional method for manufacturing float glass, except that the above-described curtain 6 or 600 is provided in the float bath 30. Referring again to fig. 1, a method of manufacturing float glass using the screen 6 or 600 having the above-described structure will be described.
For example, a glass raw material is supplied to a melting furnace set at about 1600 ℃ to obtain molten glass, and then the molten glass is poured into a molten metal bath 10 filled with molten tin to form a glass ribbon 2. The glass ribbon 2 carried out from the molten metal bath 10 is carried by the lift roller 4 in the dross box 30 provided with the above-described curtain 6, 600 and supplied to the annealing furnace 20.
The curtain 6, 600 disposed in the dross box 30 effectively suppresses deformation on the downstream side by the reinforcing means 62, 620, and therefore, it is possible to prevent fluctuations in the pressure in the molten metal bath 10 and the dross box 30 and maintain a target value. Further, the intrusion of the outside air from the inlet 23 of the buffer furnace 20 is suppressed, and the formation and adhesion of tin oxide to the glass ribbon 2 can be prevented, and a high-quality thin glass sheet with few defects can be provided.
The float glass produced is used as, for example, a glass substrate for a display, a cover glass for a display, or a window glass.
When the float glass to be produced is used as a glass substrate for a display, it may be alkali-free glass. The alkali-free glass contains substantially no Na2O、K2O、Li2And alkali metal oxide glasses such as O. The alkali-free glass may contain alkali metal oxides in an amount of 0.1% by mass or less in total.
[ examples ] A method for producing a compound
The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.
The present inventors prepared a curtain without a deformation preventing plate (comparative example) and a curtain with a deformation preventing plate attached thereto (curtain of the first embodiment) (example), and disposed them in a dross box in the same environment for 4 months, and confirmed the deformation of the curtain, the pressure in the dross box, and the quality of the produced sheet glass. The thickness of the produced thin glass sheet is 0.7mm or less.
The frame member and the corrugated iron plate portion used in the comparative examples and examples were made of stainless steel. The frame member had a thickness of 3mm, and the corrugated iron plate portion was a corrugated iron plate having a corrugated shape and a thickness of 0.15 mm. The deformation preventing plate of the example was made of stainless steel having a plate thickness of 3mm, a width of 40mm and a height (length) of 270 mm.
The results after 4 months are shown in figure 5.
When thermal deformation was noted, the example did not observe deformation in the corrugated iron plate portion. In the comparative example without the deformation preventing plate, the deformation in which the central portion of the corrugated iron plate portion largely bulges toward the downstream side was confirmed.
In the example, the horizontal jack adjustment for adjusting the gap between the lower end of the corrugated iron plate portion and the glass ribbon in accordance with the deformation of the corrugated iron plate portion was only 1 time of insertion, and was not performed thereafter. In the comparative example, 16 times were conducted in 4 months.
Replacement of the shade is not required at one time in embodiments. In the comparative example, the deformation was such that the replacement of the screen had to be performed after 2 months from the beginning.
In the examples, the pressure in the molten metal bath and the dross box hardly fluctuates, and the target pressure can be maintained. In the comparative example, the pressure varied significantly.
In the quality of the produced sheet glass, defects such as scum (adhesion of tin oxide), peeling, sheet breakage, and sheet warping were not observed in the examples. In the comparative example, the above-mentioned disadvantages were confirmed.
In addition, in the curtain 600 according to the second embodiment, no large deformation was observed, and the curtain was not replaced for a long period of time, and was confirmed to be good in terms of maintaining the pressure in the scum box and quality.
As described above, the float glass manufacturing apparatus according to the present invention has the following structure of the screen disposed in the float bath: the reinforcing unit having the above-described structure is provided on the downstream side in the glass ribbon conveyance direction. Therefore, pressure fluctuations in the molten metal bath and the dross box and intrusion of outside air can be suppressed, and the pressure in the dross box 30 can be kept within a target value, which contributes to the production of high-quality sheet glass. Further, since the deformation of the curtain is suppressed, adjustment work, replacement, and the like associated with the deformation of the curtain are not necessary, and production loss during this time can be prevented, and the work efficiency and the economical efficiency are excellent.
Although the embodiments of the float glass manufacturing apparatus and the float glass manufacturing method have been described above, the present invention is not limited to the above embodiments, and various modifications and improvements can be made within the scope of the present invention described in the claims.
In particular, the shape and structure of the reinforcing unit are not limited to this, and may be any shape and structure that can suppress deformation of the curtain. For example, a reinforcing member having a shape and a structure extending in the width direction may be applied to the lower side of the corrugated iron plate portion constituting the curtain.
Claims (10)
1. A float glass manufacturing device is provided with: a molten metal bath for containing molten metal; a slow cooling furnace into which a glass ribbon formed into a ribbon shape on the molten metal is conveyed; the scum box is arranged between the metal liquid tank and the slow cooling furnace; and a curtain provided in the dross box and disposed above a plurality of lift rollers for conveying the glass ribbon from the molten metal bath to the slow cooling furnace,
the manufacturing device of the float glass is characterized in that,
the curtain is provided with a reinforcing unit on the downstream side in the conveying direction of the glass ribbon.
2. The manufacturing apparatus of float glass according to claim 1,
the shade has a frame portion and a corrugated iron plate portion,
the frame portions are disposed on the corrugated iron plate portion at the upper portion thereof, respectively, on the downstream side and the upstream side of the corrugated iron plate portion in the glass ribbon conveying direction, and sandwich the corrugated iron plate portion.
3. The manufacturing apparatus of float glass according to claim 1 or 2, wherein,
the reinforcing means is a plurality of deformation preventing plates provided at intervals in the longitudinal direction of the curtain.
4. The manufacturing apparatus of float glass according to claim 2,
the frame portion of the reinforcement unit disposed on the downstream side in the glass ribbon conveying direction is formed longer than the frame portion disposed on the upstream side in the glass ribbon conveying direction.
5. The manufacturing apparatus of float glass according to claim 2,
the lower end of the reinforcing unit is disposed above the lower end of the corrugated iron plate portion.
6. The manufacturing apparatus of float glass according to claim 3, wherein,
the plurality of deformation preventing plates are arranged at intervals of 250mm to 350 mm.
7. The manufacturing apparatus of float glass according to claim 2,
the reinforcing unit has a thickness thicker than the corrugated iron plate portion.
8. The manufacturing apparatus of float glass according to claim 1 or 2, wherein,
the reinforcing unit has a thickness of 2.5mm to 3.5 mm.
9. The manufacturing apparatus of float glass according to claim 2,
the corrugated iron plate portion has a thickness of 0.1mm to 0.2 mm.
10. A method for manufacturing a float glass, using the float glass manufacturing apparatus according to any one of claims 1 to 9.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015087019 | 2015-04-21 | ||
| JP2015-087019 | 2015-04-21 |
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| Publication Number | Publication Date |
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| CN106064878A CN106064878A (en) | 2016-11-02 |
| CN106064878B true CN106064878B (en) | 2020-06-05 |
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| CN201610245204.0A Active CN106064878B (en) | 2015-04-21 | 2016-04-19 | Float glass manufacturing device and float glass manufacturing method |
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| JP (1) | JP6536427B2 (en) |
| KR (1) | KR20160125288A (en) |
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| EP3795544A4 (en) * | 2018-05-17 | 2022-03-02 | Agc Inc. | Float glass production device and float glass production method |
| CN110862219A (en) * | 2019-12-28 | 2020-03-06 | 蚌埠中光电科技有限公司 | Float glass tin bath broken plate lifting device |
| JP7251487B2 (en) * | 2020-01-15 | 2023-04-04 | Ａｇｃ株式会社 | Float glass manufacturing apparatus and float glass manufacturing method |
| JP7404881B2 (en) | 2020-01-15 | 2023-12-26 | Ａｇｃ株式会社 | Float glass manufacturing equipment and float glass manufacturing method |
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| CN1942410A (en) * | 2004-04-07 | 2007-04-04 | 旭硝子株式会社 | Apparatus and method for manufacturing plate glass |
| CN201321431Y (en) * | 2008-12-25 | 2009-10-07 | 杭州蓝星新材料技术有限公司 | On-line coated environment adjusting device of lehr AO area of float glass production line |
| CN102046542A (en) * | 2008-06-06 | 2011-05-04 | 旭硝子株式会社 | Apparatus and method for producing plate glass |
| TW201425240A (en) * | 2012-10-31 | 2014-07-01 | Asahi Glass Co Ltd | Float glass production method and production device |
| WO2015025569A1 (en) * | 2013-08-22 | 2015-02-26 | 旭硝子株式会社 | Float glass production device and float glass production method using the same |
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| JPS4612693Y1 (en) * | 1968-11-26 | 1971-05-06 |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1942410A (en) * | 2004-04-07 | 2007-04-04 | 旭硝子株式会社 | Apparatus and method for manufacturing plate glass |
| CN102046542A (en) * | 2008-06-06 | 2011-05-04 | 旭硝子株式会社 | Apparatus and method for producing plate glass |
| CN201321431Y (en) * | 2008-12-25 | 2009-10-07 | 杭州蓝星新材料技术有限公司 | On-line coated environment adjusting device of lehr AO area of float glass production line |
| TW201425240A (en) * | 2012-10-31 | 2014-07-01 | Asahi Glass Co Ltd | Float glass production method and production device |
| WO2015025569A1 (en) * | 2013-08-22 | 2015-02-26 | 旭硝子株式会社 | Float glass production device and float glass production method using the same |
Also Published As
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| JP6536427B2 (en) | 2019-07-03 |
| KR20160125288A (en) | 2016-10-31 |
| JP2016204248A (en) | 2016-12-08 |
| CN106064878A (en) | 2016-11-02 |
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