CN114507004B - Float glass manufacturing device and float glass manufacturing method - Google Patents
Float glass manufacturing device and float glass manufacturing method Download PDFInfo
- Publication number
- CN114507004B CN114507004B CN202210333468.7A CN202210333468A CN114507004B CN 114507004 B CN114507004 B CN 114507004B CN 202210333468 A CN202210333468 A CN 202210333468A CN 114507004 B CN114507004 B CN 114507004B
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- Prior art keywords
- cooling
- outlet wall
- width direction
- refrigerant
- cooling plate
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- 239000005329 float glass Substances 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 35
- 238000001816 cooling Methods 0.000 claims abstract description 182
- 239000003507 refrigerant Substances 0.000 claims abstract description 82
- 229910052751 metal Inorganic materials 0.000 claims abstract description 34
- 239000002184 metal Substances 0.000 claims abstract description 34
- 239000006060 molten glass Substances 0.000 claims abstract description 20
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 6
- 238000006073 displacement reaction Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- 239000011521 glass Substances 0.000 description 41
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 8
- 239000007789 gas Substances 0.000 description 5
- 239000004973 liquid crystal related substance Substances 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000011449 brick Substances 0.000 description 3
- 238000003426 chemical strengthening reaction Methods 0.000 description 3
- 239000006059 cover glass Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 2
- 239000005347 annealed glass Substances 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 239000005345 chemically strengthened glass Substances 0.000 description 2
- 239000005357 flat glass Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000005361 soda-lime glass Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910018068 Li 2 O Inorganic materials 0.000 description 1
- 229910001128 Sn alloy Inorganic materials 0.000 description 1
- 229910006404 SnO 2 Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910001413 alkali metal ion Inorganic materials 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- C03B18/18—Controlling or regulating the temperature of the float bath; Composition or purification of the float bath
-
- 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
- C03B18/22—Controlling or regulating the temperature of the atmosphere above the float tank
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
Abstract
A float glass manufacturing apparatus comprising a bath for containing molten metal and a cooling plate for cooling an outlet wall as a downstream end portion of the bath from a downstream side, wherein the molten metal floats on molten glass formed in a plate shape while flowing from an upstream side to a downstream side, the cooling plate comprises a pair of outer cooling portions provided on the outermost side in a width direction of the outlet wall and a pair of inner cooling portions provided on the innermost side in the width direction of the outlet wall, the outer cooling portions and the inner cooling portions independently comprise a flow path for a refrigerant, the flow path is arranged in a line-symmetrical manner with respect to a center in the width direction of the outlet wall when viewed in the flow direction of the molten glass, and upper ends of the inner cooling portions are provided for the refrigerant to flow from the inner side in the width direction to the outer side in the width direction.
Description
The present application is a divisional application of chinese patent application titled "float glass manufacturing apparatus and float glass manufacturing method" with national application number 201810123544.5.
Technical Field
The present invention relates to a float glass manufacturing apparatus and a float glass manufacturing method.
Background
In the float glass manufacturing apparatus described in patent document 1, a frame deformation preventing jacket is provided on the outer surface of the frame in order to prevent deformation of the terminal frame of the float bath. The jacket has an inlet port and an outlet port, and a gas passage is provided between the inlet port and the outlet port. An inert gas such as nitrogen is supplied from a gas supply source to the inlet port, circulated through the gas passage, and then discharged from the outlet port. 2 gas passages are illustrated.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open publication No. 2011-251897
Disclosure of Invention
Technical problem to be solved by the invention
The bath is also called a float bath for containing molten metal that floats on molten glass formed into a plate shape while flowing from an upstream side to a downstream side. The bath has an outlet wall at the downstream end. The upper surface of the outlet wall is slightly above the level of the molten metal. The difference in height is set to a low value as much as possible so that the glass ribbon can be slowly pulled up from the molten metal.
The temperature of the outlet wall tends to be highest in the center portion in the width direction of the upper surface of the outlet wall. The larger the temperature difference of the outlet wall, the larger the deformation of the lower surface of the outlet wall, as a result of which the deformation of the upper surface of the outlet wall increases.
Thus, in order to reduce the temperature difference of the outlet wall, a cooling plate that cools the outlet wall from the downstream side is used. Thereby, deformation of the upper surface of the outlet wall can be suppressed, and leakage of the molten metal from the upper surface of the outlet wall can be suppressed.
However, a large-area glass plate is demanded due to a large screen of a display device or the like. To produce large-area glass sheets, the width of the glass ribbon needs to be enlarged, and thus the width of the outlet wall needs to be enlarged.
In order to cope with the expansion of the width of the outlet wall, improvement in the structure of the cooling plate is demanded.
The purpose of the present invention is to provide a float glass manufacturing apparatus capable of suppressing leakage of molten metal from a bath.
Technical proposal adopted for solving the technical problems
The present invention provides a float glass manufacturing apparatus, comprising: a bath containing molten metal for floating molten glass formed into a plate shape while flowing from an upstream side to a downstream side, and a cooling plate for cooling an outlet wall as a downstream end portion of the bath from the downstream side;
the cooling plate has a pair of outer cooling portions provided on the outermost side in the width direction of the outlet wall and a pair of inner cooling portions provided on the innermost side in the width direction of the outlet wall;
the pair of outer cooling portions and the pair of inner cooling portions independently have flow passages for a refrigerant, and the flow passages are arranged in a line-symmetrical manner about a widthwise center of the outlet wall when viewed from a flow direction of the molten glass.
Effects of the invention
With the float glass manufacturing apparatus of the present invention, leakage of molten metal from the bath can be suppressed.
Drawings
Fig. 1 is a sectional view of a float glass manufacturing apparatus according to an embodiment.
Fig. 2 is a view of the internal structure of the cooling plate of the first embodiment when viewed from the downstream side.
Fig. 3 is a view of the internal structure of the cooling plate of the second embodiment as seen from the downstream side.
Fig. 4 is a view of the internal structure of the cooling plate of the third embodiment as seen from the downstream side.
Fig. 5 is a view of the internal structure of the cooling plate of the fourth embodiment as seen from the downstream side.
Fig. 6 is a view of the internal structure of the cooling plate according to the modification of the first embodiment when viewed from the downstream side.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding structures are denoted by the same or corresponding symbols, and description thereof is omitted.
(outline of float glass manufacturing apparatus)
Fig. 1 is a sectional view of a float glass manufacturing apparatus according to an embodiment. The float glass manufacturing apparatus 10 has a bath 11 containing molten metal 2 from which molten glass 4 floats. The molten glass 4 is continuously supplied to the molten metal 2 accommodated in the bath 11, and the molten metal 2 flows from the upstream side to the downstream side and is formed into a plate-shaped glass ribbon 6. The glass ribbon 6 is slowly cooled and solidified while flowing in the direction of arrow a over the liquid surface of the molten metal 2. The glass ribbon 6 is pulled from the molten metal 2 in a downstream region of the bath 11 and fed into an annealing furnace. The annealed glass ribbon 6 is cut to a prescribed size, thereby manufacturing a glass sheet (float glass).
As shown in fig. 1, a bath 11 contains molten metal 2. The molten metal 2 may be, for example, molten tin or a molten tin alloy. The bath 11 has a metal shell 12 and a plurality of bricks 13 covering the inside of the metal shell 12. The bricks 13 are assembled into a box shape and contain the molten metal 2 therein.
The bath 11 has an outlet wall 15 at the downstream end. The upper surface 15a of the outlet wall 15 is slightly above the level of the molten metal 2. The difference in height is set to a low value as much as possible so that the glass ribbon 6 can be slowly pulled up from the molten metal 2.
The temperature of the outlet wall 15 tends to be highest in the center portion in the width direction of the upper surface 15a of the outlet wall 15. The larger the temperature difference of the outlet wall 15, the larger the deformation of the lower surface 15b of the outlet wall 15, with the result that the deformation of the upper surface 15a of the outlet wall 15 increases.
Thus, in order to reduce the temperature difference of the outlet wall 15, a cooling plate 20 that cools the outlet wall 15 from the downstream side is used. This suppresses deformation of the upper surface 15a of the outlet wall 15, and thus can suppress leakage of the molten metal 2 from the upper surface 15a of the outlet wall 15.
However, a large-area glass plate is demanded due to a large screen of a display device or the like. To produce a large area glass sheet, the width of the glass ribbon 6 needs to be enlarged, and thus the width of the outlet wall 15 needs to be enlarged.
The present inventors studied the structure of the cooling plate 20 capable of suppressing the temperature difference of the outlet wall 15 of a large width. The structure of the cooling plate 20 of the present invention will be described below. The cooling plate 20 of the present invention is particularly effective when the width of the glass ribbon 6 is 5000mm or more, and can be used when the width of the glass ribbon 6 is less than 5000 mm.
(Cooling plate)
Fig. 2 is a view of the internal structure of the cooling plate according to one embodiment as viewed from the downstream side. Fig. 3 to 5 are views of the internal structure of the cooling plates according to the second to fourth embodiments when viewed from the downstream side. Fig. 6 is a view of the internal structure of the cooling plate according to the modification of the first embodiment when viewed from the downstream side.
The cooling plate 20 cools the outlet wall 15 of the bath 11 from the downstream side. The cooling plate 20 is fixed to the outlet wall 15 by welding or the like.
As shown in fig. 2, the cooling plate 20 is divided into 4 areas 21 to 24 in the width direction of the outlet wall 15, and each of the areas 21 to 24 has a refrigerant flow passage 31 to 34. The cooling plate 20 may be divided into regions 21 to 24 as shown in fig. 2, or may be integrally formed. In the present specification, the width direction means a horizontal direction orthogonal to the flow direction of the molten glass 4.
Hereinafter, the pair of regions 21, 22 provided on the outermost side in the width direction of the outlet wall 15 will be referred to as a pair of external cooling portions 21, 22. The pair of regions 23 and 24 provided at the innermost side in the width direction of the outlet wall 15 is referred to as a pair of inner cooling portions 23 and 24.
The pair of outer cooling portions 21, 22 and the pair of inner cooling portions 23, 24 independently have refrigerant flow passages 31 to 34. Specifically, one outer cooling portion 21 has a flow passage 31, the other outer cooling portion 22 has a flow passage 32, one inner cooling portion 23 has a flow passage 33, and the other inner cooling portion 24 has a flow passage 34.
The cooling plate 20 has 4 flow passages 31 to 34 arranged in the width direction of the outlet wall 15. The number of flow channels arranged in the width direction of the outlet wall 15 is increased from 2 to 4, which can improve the cooling capacity of the cooling plate 20 and reduce the temperature difference of the outlet wall 15. Further, by increasing the number of flow channels arranged in the width direction of the outlet wall 15 from 2 to 4, the temperature distribution in the width direction of the outlet wall 15 can be finely adjusted.
The flow channels 31, 32 of the pair of outer cooling portions 21, 22 are formed to be line-symmetrical with respect to the widthwise center as viewed from the flow direction of the molten glass 4. The flow passages 33, 34 of the pair of inner cooling portions 23, 24 are formed in line symmetry with respect to the widthwise center of the outlet wall 15 when viewed from the flow direction of the molten glass 4.
That is, the 4 flow channels 31 to 34 are line-symmetrical with respect to the widthwise center of the outlet wall 15 when viewed from the flow direction of the molten glass 4. Thereby, the outlet wall 15 can be cooled in a line symmetrical manner centering on the widthwise center. Therefore, deformation of the lower surface 15b of the outlet wall 15 can be suppressed, and as a result, deformation of the upper surface 15a of the outlet wall 15 can be suppressed. So that leakage of the molten metal 2 from the upper surface 15a of the outlet wall 15 can be suppressed.
The cooling plate 20 of the present embodiment is divided into 4 regions 21 to 24 in the width direction of the outlet wall 15, and each of the regions 21 to 24 has a refrigerant flow passage, but may be divided into an even number of 6 or more regions in the width direction of the outlet wall 15, each region having a refrigerant flow passage. At this time, the even-numbered 6 or more flow channels are line-symmetrical with respect to the widthwise center of the outlet wall 15 when viewed from the flow direction of the molten glass 4.
However, the temperature of the outlet wall 15 tends to be highest in the widthwise center portion of the upper surface 15a of the outlet wall 15. The refrigerant flowing through the cooling plate 20 absorbs heat from the cooling plate 20 as it flows from the inlet to the outlet. Therefore, the higher the temperature of the refrigerant, the lower the cooling capacity of the refrigerant, as going from the inlet toward the outlet.
Then, the upper end portions of the pair of inner cooling portions 23, 24 may be supplied with the refrigerant from the inner side in the width direction to the outer side in the width direction, respectively. This allows the refrigerant having a relatively low temperature and a relatively high cooling capacity to absorb heat at the widthwise central portion of the upper surface 15a of the outlet wall 15, thereby further reducing the temperature difference of the outlet wall 15.
On the other hand, the upper end portions of the pair of outer cooling portions 21, 22 may be configured to allow the refrigerant to flow from the outer side in the width direction to the inner side in the width direction. By making the flow direction of the refrigerant at the upper end portions of the pair of outer cooling portions 21, 22 opposite to the flow direction of the refrigerant at the upper end portions of the pair of inner cooling portions 23, 24, the temperature difference at the upper end portions of the outlet wall 15 can be reduced.
The flow channels 31 and 33 of the outer cooling portions 21 and the inner cooling portions 23 adjacent to each other may be formed in line symmetry about the boundary line between the outer cooling portions 21 and the inner cooling portions 23 when viewed in the flow direction of the molten glass 4. Similarly, when viewed from the flow direction of the molten glass 4, the flow channels 32 of the adjacent outer cooling portions 22 and the flow channels 34 of the inner cooling portions 24 may be formed to be symmetrical about the boundary line between the outer cooling portions 22 and the inner cooling portions 24. The respective inlet ports 41 can be pooled and the respective outlet ports 42 can be pooled.
The width direction length of the outlet wall 15 is preferably 5500mm or more, more preferably 6000mm or more. The reason is that the efficiency of manufacturing a glass substrate for a large-sized liquid crystal display such as 2500mm×2200mm (G8), 3130mm×2880mm (G10), 3370mm×2940mm (G10.5) is good. Therefore, the width direction length of the cooling plate 20 of the cooling outlet wall 15 is also preferably 5500mm or more, more preferably 6000mm or more.
The cooling plate 20A of fig. 3 is the same as the cooling plate 20 of fig. 2 in that the refrigerant flows from the outer side in the width direction to the inner side in the width direction in the upper end portions of the pair of outer cooling portions 21, 22, respectively. On the other hand, the cooling plate 20A is different from the cooling plate 20 in that the refrigerant flows from the outer side in the width direction to the inner side in the width direction in the upper end portions of the pair of inner cooling portions 23, 24, respectively.
The cooling plate 20B of fig. 4 is different from the cooling plate 20 of fig. 2 in that the refrigerant flows from the inner side in the width direction to the outer side in the width direction in the upper end portions of the pair of outer cooling portions 21, 22. The cooling plate 20B is different from the cooling plate 20 in that the refrigerant flows from the outer side in the width direction to the inner side in the width direction in the upper end portions of the pair of inner cooling portions 23, 24.
The cooling plate 20C in fig. 5 is different from the cooling plate 20 in fig. 2 in that the refrigerant flows from the inner side in the width direction to the outer side in the width direction in the upper end portions of the pair of outer cooling portions 21, 22. On the other hand, the cooling plate 20C is the same as the cooling plate 20 in that the refrigerant flows from the inner side in the width direction to the outer side in the width direction in the upper end portions of the pair of inner cooling portions 23, 24.
The cooling plate 20D of fig. 6 has the same structure as the flow passages 31, 32 of the pair of outer cooling portions 21, 22 and the flow passages 33, 34 of the pair of inner cooling portions 23, 24 of the cooling plate 20 of fig. 2. However, the positions of the cooling plate 20D and the refrigerant inlet port 41 and the outlet port 42 of the cooling plate 20 are opposite. Therefore, the refrigerant flows from the inner side in the width direction to the outer side in the width direction in the upper end portions of the pair of outer cooling portions 21 and 22 of the cooling plate 20D, and the refrigerant flows from the outer side in the width direction to the inner side in the width direction in the upper end portions of the pair of inner cooling portions 23 and 24.
(Structure of flow passage of inner Cooling portion)
The structure of the flow passages 33, 33A of one inner cooling portion 23 will be described. The flow passages 34 and 34A of the other inner cooling portion 24 have the same structure, and therefore, the description thereof is omitted.
One end of the flow path 33 is connected to the refrigerant inlet port 41, and the other end is connected to the refrigerant outlet port 42. The refrigerant flowing through the flow passage 33 may be any of air, a gas such as nitrogen, and a liquid such as water.
The inlet port 41 is connected to a supply source 45 of refrigerant through a supply pipe 43. A flow rate adjustment valve 46 for adjusting the flow rate of the refrigerant supplied to the flow passage 33 is provided midway in the supply pipe 43. The inlet port 41 is provided, for example, on the lower surface of the inner cooling portion 23.
The flow passage 33 has a vertical portion 33a extending upward from the inlet port 41. The upper end of the vertical portion 33a is connected to the horizontal portion 33b. The refrigerant flows from the lower side to the upper side in the vertical portion 33a, and flows into the horizontal portion 33b.
The flow path 33 includes a plurality of horizontal portions 33b arranged in the vertical direction, and a folded portion 33c connecting end portions of the horizontal portions 33b adjacent in the vertical direction to each other. The refrigerant repeatedly flows from the upper horizontal portion 33b to the lower horizontal portion 33b via the folded portion 33c. One end of the lowermost horizontal portion 33b in the width direction is connected to the outlet port 42.
The outlet port 42 is provided, for example, on a lower surface of the inner cooling portion 23, for example, at one end in a width direction of the lower surface. The other end portion of the lower surface in the width direction is provided with an inlet port 41. The outlet port 42 is provided with a refrigerant temperature detector 47 for detecting the temperature of the refrigerant discharged from the flow path 33.
The flow path 33A of fig. 3 and 4 is different from the flow path 33 of fig. 2 in that the positions of the inlet port 41 and the outlet port 42 of the refrigerant are opposite. On the other hand, the flow path 33A is the same as the flow path 33 in that it has a vertical portion 33A, a horizontal portion 33b, and a folded portion 33c.
In the flow path 33 of fig. 6, the refrigerant repeatedly flows into the horizontal portion 33b, flows from the lower horizontal portion 33b to the upper horizontal portion 33b via the folded portion 33c, and flows from the upper side to the lower side in the vertical portion 33a.
Further, a flow straightening plate may be provided in the middle of the flow passages 33, 33A. In addition, a part of the wall surface of the horizontal portion 33b may be curved, not straight, in a cross-sectional view.
(Structure of flow passage of outer Cooling portion)
The structure of the flow passages 31, 31B of one outside cooling portion 21 will be described. The flow passages 32 and 32B of the other outside cooling portion 22 have the same structure, and therefore, the description thereof is omitted.
One end of the flow path 31 is connected to the refrigerant inlet port 41, and the other end is connected to the refrigerant outlet port 42. The refrigerant flowing in the flow passage 31 may be different from the refrigerant flowing in the flow passage 33, or may be the same as the refrigerant flowing in the flow passage 33.
The inlet port 41 is connected to a supply source 45 of refrigerant through a supply pipe 43. A flow rate adjustment valve 46 for adjusting the flow rate of the refrigerant supplied to the flow path 31 is provided midway in the supply pipe 43. The inlet port 41 is provided, for example, on the lower surface of the outer cooling portion 21.
The flow passage 31 has a vertical portion 31a extending upward from the inlet port 41. The upper end of the vertical portion 31a is connected to the horizontal portion 31b. The refrigerant flows from the lower side to the upper side in the vertical portion 31a, and flows into the horizontal portion 31b.
The flow path 31 includes a plurality of horizontal portions 31b arranged in the vertical direction, and a folded portion 31c connecting end portions of the horizontal portions 31b adjacent in the vertical direction to each other. The refrigerant repeatedly flows from the upper horizontal portion 31b to the lower horizontal portion 31b via the folded portion 31c. One end portion of the lowermost horizontal portion 31b in the width direction is connected to the outlet port 42.
The outlet port 42 is provided, for example, on a lower surface of the outer cooling portion 21, for example, at one end in a width direction of the lower surface. The other end portion of the lower surface in the width direction is provided with an inlet port 41. The outlet port 42 is provided with a refrigerant temperature detector 47 for detecting the temperature of the refrigerant discharged from the flow path 31.
The flow path 31B of fig. 4 and 5 is different from the flow path 31 of fig. 2 in that the positions of the inlet port 41 and the outlet port 42 of the refrigerant are opposite. On the other hand, the flow path 31B is the same as the flow path 31 in that it has a vertical portion 31a, a horizontal portion 31B, and a folded portion 31c.
In the flow path 31 in fig. 6, the refrigerant repeatedly flows into the horizontal portion 31b and flows from the lower horizontal portion 31b to the upper horizontal portion 31b via the folded portion 31c, and flows from the upper side to the lower side in the vertical portion 31a.
The inlet port 41 may be provided not on the lower surface of the outer cooling portion 21 but on the widthwise outward surface of the outer cooling portion 21. In this case, the vertical portion 31a may not be provided, and the horizontal portion 31b may extend inward in the width direction from the inlet port 41. Further, a flow straightening plate may be provided in the middle of the flow paths 31 and 31B. In addition, a part of the wall surface of the horizontal portion 31b in the cross-sectional view may be curved instead of a straight line.
The outlet port 42 in fig. 6 may be provided not on the lower surface of the outside cooling portion 21 but on the widthwise outward surface of the outside cooling portion 21. In this case, the vertical portion 31a may not be provided, and the horizontal portion 31b may extend inward in the width direction from the outlet port 42.
(temperature distribution of Cooling plate)
The highest temperature of the upper end portion of the cooling plate 20 is a temperature at which solidification of the molten metal 2 can be prevented, for example, 300 ℃. The temperature of the upper end portion of the cooling plate 20 tends to be highest at the widthwise central portion.
The difference between the highest temperature and the lowest temperature at the upper end of the cooling plate 20 is, for example, 100 ℃ or less. The temperature of the upper end portion of the cooling plate 20 tends to be lowest at the end portion in the width direction.
The temperature difference between the temperature of the upper end portion of the cooling plate 20 and the temperature of the lower end portion of the cooling plate 20 is, for example, 150 ℃ or less. Here, the temperature difference between the upper end portion and the lower end portion is measured between the same positions as the positions in the width direction.
The above description of the temperature distribution of the cooling plate 20 is also applicable to the temperature distribution of the cooling plates 20A to 20D.
(use of the detection result of the refrigerant temperature detector)
The refrigerant temperature detector 47 detects the temperature of the refrigerant discharged from each of the flow paths 31 to 34 of the cooling plate 20. Each of the flow passages 31 to 34 is provided with a refrigerant temperature detector 47. The detected temperature of the refrigerant temperature detector 47 indicates the amount of heat transferred from the cooling plate 20 to the refrigerant. The more this heat quantity, the higher the detection temperature of the refrigerant temperature detector 47.
The refrigerant temperature detector 47 is provided at the outlet port 42 in fig. 2, or may be provided in the middle of a discharge pipe 48 that feeds the refrigerant from the outlet port 42 to the outside. The refrigerant temperature detector 47 may be capable of detecting the temperature of the refrigerant discharged from each of the flow paths 31 to 34.
The detected temperature of the refrigerant temperature detector 47 is used for control of the flow rate adjustment valve 46, control of the alarm device 71, and the like.
The flow rate adjustment valve 46 adjusts the flow rate of the refrigerant supplied to the flow paths 31 to 34 of the cooling plate 20 based on the detected temperature of the refrigerant temperature detector 47. The flow paths 31 to 34 are provided with flow rate adjustment valves 46 for adjusting the flow rates of the refrigerants in the flow paths 31 to 34, respectively.
For example, the flow rate adjustment valve 46 adjusts the flow rate of the refrigerant so that the detected temperature of the refrigerant discharged from the flow passage as the target of the flow rate adjustment is within an allowable range. This suppresses the temperature change of the cooling plate 20, and stabilizes the quality of the glass ribbon 6.
The alarm device 71, for example, gives an alarm when the detected temperature of the refrigerant temperature detector 47 exceeds the allowable range. This can notify the user of the shortage of the flow rate of the refrigerant, and the like. The alarm device 71 does not issue an alarm when the detected temperature of the refrigerant temperature detector 47 is within the allowable range.
The detected temperature of the refrigerant temperature detector 47 may be displayed by a display device 72 such as a liquid crystal display. Thereby improving the convenience of the user. The display device 72 may also have an alarm device 71, and an alarm may be issued as an image. In addition, an alarm may also be sounded.
The above description of the use of the refrigerant temperature detector 47 and the detection result thereof is also applicable to the case where the cooling plate 20 is replaced with any one of the cooling plates 20A to 20D.
(utilization of deflection measuring instrument and its measurement value)
As shown in fig. 1, the deflection measuring instrument 51 measures the deflection of the lower surface 15b of the outlet wall 15. The deflection of the lower surface 15b is expressed by, for example, displacement of the widthwise central portion of the lower surface 15b with respect to a straight line connecting both widthwise end portions of the lower surface 15 b.
The deflection measuring instrument 51 includes, for example, a plurality of laser displacement meters 52 for measuring displacements in the up-down direction of the lower surface 15b of the outlet wall 15. The plurality of laser displacement meters 52 are arranged at intervals in the width direction of the outlet wall 15.
The deflection of the upper surface 15a of the outlet wall 15 can be estimated by measuring the deflection of the lower surface 15b of the outlet wall 15 with the deflection measuring instrument 51. This makes it possible to detect the difference in height between the upper surface 15a of the outlet wall 15 and the liquid surface of the molten metal 2 with good accuracy.
In the present embodiment, the deflection measuring instrument 51 includes a plurality of laser displacement meters 52, but may also include strain gauges and the like. The deflection measuring instrument 51 may measure the deflection of the lower surface of the cooling plate 20 and measure the displacement of the widthwise central portion of the lower surface. The cooling plate 20 is fixed to the outlet wall 15 by welding or the like as described above, and therefore if the outlet wall 15 is deflected, the cooling plate 20 is also deflected. The greater the deflection of the outlet wall 15, the greater the deflection of the cooling plate 20.
The measured value of the deflection measuring instrument 51 is used for control of the cooler 53, control of the alarm device 71, and the like. The cooler 53 is used in the case where the cooling capacity of the cooling plate 20 is insufficient. In this case, the widthwise central portion of the lower surface 15b of the outlet wall 15 tends to be displaced downward with respect to a straight line connecting both widthwise end portions of the lower surface 15b of the outlet wall 15. Therefore, the widthwise central portion of the upper surface 15a of the outlet wall 15 tends to be displaced downward with respect to a straight line connecting both widthwise end portions of the upper surface 15a of the outlet wall 15.
The cooler 53 cools the outlet wall 15 from below based on the measurement value of the deflection measuring instrument 51. Thereby, the lower surface 15b of the outlet wall 15 can be contracted in the width direction, and the width direction center portion of the lower surface 15b can be displaced upward relative to a straight line connecting both width direction end portions of the lower surface 15 b. As a result, the widthwise central portion of the upper surface 15a can be displaced upward relative to a straight line connecting both widthwise end portions of the upper surface 15a, and leakage of the molten metal 2 from the widthwise central portion of the upper surface 15a can be suppressed. This is particularly effective in the case where the cooling capacity of the cooling plate 20 is insufficient.
For example, in the case where the measured value of the deflection measuring instrument 51 is out of the allowable range, the cooler 53 cools the outlet wall 15 from below, and in the case where the measured value of the deflection measuring instrument 51 is within the allowable range, the cooler 53 does not cool the outlet wall 15 from below. The allowable range used here is set in advance by a test or the like, and when the measured value of the deflection measuring instrument 51 is within the allowable range, the molten metal 2 does not leak from the outlet wall 15.
As the cooler 53, for example, an air cooling fan, a water cooling jacket, or the like can be used. The air cooling fan is provided below the outlet wall 15, and sprays air to the lower surface 15b of the outlet wall 15 to cool the outlet wall 15 from below. The water-cooling jacket is installed on the lower surface 15b of the outlet wall 15 to cool the outlet wall 15 from below by supplying water to the inside of the water-cooling jacket.
The alarm device 71 gives an alarm when, for example, the measured value of the deflection measuring instrument 51 is out of the allowable range. The alarm device 71 activates the cooler 53, for example, based on the measurement value of the deflection measuring instrument 51, and in addition, issues an alarm when the measurement value of the deflection measuring instrument 51 exceeds the allowable range. The alarm device 71 does not issue an alarm when the measured value of the deflection measuring instrument 51 is within the allowable range.
The measured value of the deflection measuring instrument 51 may be displayed by a display device 72 such as a liquid crystal display. Thereby improving the convenience of the user. The display device 72 may also have an alarm device 71, and an alarm may be issued as an image. In addition, an alarm may also be sounded.
The above description of the use of the deflection measuring instrument 51 and its measured values is also applicable to the case where the cooling plate 20 is replaced with any one of the cooling plates 20A to 20D.
(Cooling plate temperature Detector and use thereof)
As shown in fig. 2, the cooling plate temperature detector 55 detects the temperature of the upper end portion of the cooling plate 20. The cooling plate temperature detector 55 is used to detect the temperature of the widthwise end portion of the upper end portion of the cooling plate 20, for example. The detected temperature of the cooling plate temperature detector 55 is used for control of the flow rate adjustment valve 46, control of the alarm device 71, and the like.
The flow rate adjustment valve 46 adjusts the flow rate of the refrigerant supplied to the flow paths 31 to 34 of the cooling plate 20 based on the detected temperature of the cooling plate temperature detector 55. The flow paths 31 to 34 are provided with flow rate adjustment valves 46 for adjusting the flow rates of the refrigerants in the flow paths 31 to 34, respectively.
For example, the flow rate adjustment valve 46 adjusts the flow rate of the refrigerant so that the detected temperature of the cooling plate temperature detector 55 is within the allowable range. Thereby, deterioration due to overheating of the cooling plate 20 can be suppressed.
The alarm device 71, for example, gives an alarm when the detected temperature of the cooling plate temperature detector 55 exceeds the allowable range. Thereby, the user can be notified of the shortage of the flow rate of the refrigerant, or the like. The alarm device 71 does not issue an alarm when the detected temperature of the cooling plate temperature detector 55 is within the allowable range.
The detected temperature of the cooling plate temperature detector 55 may also be displayed by the display device 72. Thereby improving the convenience of the user. The display device 72 may also have an alarm device 71, and an alarm may be issued as an image. In addition, an alarm may also be sounded.
The cooling plate temperature detector 55 is not limited to the width direction end portion of the upper end portion of the cooling plate 20, and may detect the temperature of the width direction center portion of the upper end portion of the cooling plate 20.
The above description of the cooling plate temperature detector 55 and its use is also applicable to the case where the cooling plate 20 is replaced with any one of the cooling plates 20A to 20D.
(control device)
As shown in fig. 1, the control device 60 includes a CPU (central processing unit) 61, a storage medium 62 such as a memory, an input interface 63, and an output interface 64. The control device 60 performs various controls by running a program stored in the storage medium 62 on the CPU 61. The control device 60 receives a signal from the outside through the input interface 63, and transmits a signal to the outside through the output interface 64. The control device 60 is used for controlling the flow rate adjustment valve 46, the cooler 53, the alarm device 71, the display device 72, and the like.
(float glass manufacturing method)
Next, a float glass manufacturing method using the float glass apparatus 10 having the above-described configuration will be described with reference to fig. 1 again.
The float glass manufacturing method includes continuously supplying molten glass 4 onto molten metal 2 in a bath 11, and forming the molten glass 4 into a plate-shaped glass ribbon 6 on the molten metal 2. The glass ribbon 6 is slowly cooled and solidified while flowing from the upstream side to the downstream side over the liquid surface of the molten metal 2. The glass ribbon 6 is pulled from the molten metal 2 in a downstream region of the bath 11 and conveyed to an annealing furnace. The annealed glass ribbon 6 is cut to a prescribed size, thereby manufacturing a glass sheet. The produced glass sheet can be used, for example, as a glass substrate for a display, a cover glass for a display, and a window glass.
When the produced glass plate is used as a glass substrate for a display, particularly as a glass substrate for a liquid crystal display, alkali-free glass may be used. The alkali-free glass is substantially Na-free 2 O、K 2 O、Li 2 Glass of alkali metal oxide such as O. The total content of alkali metal oxides in the alkali-free glass may be 0.1 mass% or less.
When the glass plate is used as a glass substrate for a liquid crystal display, the plate thickness is preferably 0.5mm or less, more preferably 0.4mm or less, and still more preferably 0.3mm or less. The thickness variation is preferably 20 μm or less, more preferably 15 μm or less, and even more preferably 10 μm or less.
Alkali-free glass, for example, contains SiO in mass% based on oxide 2 :50％～73％、Al 2 O 3 :10.5％～24％、B 2 O 3 :0％～12％、MgO:0％～10％、CaO:0％～14.5％、SrO:0％～24％、BaO:0％～13.5％、MgO+CaO+SrO+BaO:8％～29.5％、ZrO 2 :0％～5％。
In the case where both high strain point and high solubility are required, the alkali-free glass preferably contains SiO in terms of mass% based on the oxide 2 :58％～66％、Al 2 O 3 :15％～22％、B 2 O 3 :5％～12％、MgO:0％～8％、CaO:0％～9％、SrO:3％～12.5％、BaO:0％～2％、MgO+CaO+SrO+BaO:9％～18％。
When a particularly high strain point is desired, the alkali-free glass preferably contains SiO in terms of mass% based on the oxide 2 :54％～73％、Al 2 O 3 :10.5％～22.5％、B 2 O 3 :0％～5.5％、MgO:0％～10％、CaO:0％～9％、SrO:0％～16％、BaO:0％～2.5％、MgO+CaO+SrO+BaO:8％～6％。
When the produced glass sheet is used as a cover glass for a display, it may be chemically strengthened glass. The chemically strengthened glass is used as a cover glass after being chemically strengthened. The chemical strengthening treatment is performed by replacing ions (for example, na ions) having a smaller ionic radius among alkali metal ions contained in the glass surface with ions having a larger ionic radius (for example, K ions), thereby forming a compressive stress layer having a predetermined depth from the glass surface.
The glass for chemical strengthening contains SiO, for example, in mol% based on oxides 2 :62％～68％、Al 2 O 3 :6％～12％、MgO:7％～13％、Na 2 O:9％～17％、K 2 O is 0-7%, and is made of Na 2 O and K 2 Subtracting Al from the total O content 2 O 3 The difference obtained by the content of (2) is less than 10%, and ZrO is contained 2 When the content is 0.8% or less.
Another glass for chemical strengthening contains SiO in mole% based on oxide 2 :65％～85％、Al 2 O 3 :3％～15％、Na 2 O:5％～15％、K 2 0% or more but less than 2% of O, 0% -15% of MgO, and ZrO 2 :0％～1％，SiO 2 Al and Al 2 O 3 Sum of contents of (2) SiO 2 +Al 2 O 3 Below 88%.
In the case where the glass sheet produced is used as a window glass, soda lime glass may be used. Soda lime glass, for example, contains SiO in mass% based on oxide 2 :65％～75％、Al 2 O 3 :0％～3％、CaO:5％～15％、MgO:0％～15％、Na 2 O:10％～20％、K 2 O:0％～3％、Li 2 O:0％～5％、Fe 2 O 3 :0％～3％、TiO 2 :0％～5％、CeO 2 :0％～3％、BaO:0％～5％、SrO:0％～5％、B 2 O 3 :0％～5％、ZnO:0％～5％、ZrO 2 :0％～5％、SnO 2 :0％～3％、SO 3 :0％～0.5％。
(deformation and improvement)
While the embodiments and the like of the float glass manufacturing apparatus have been described above, the present invention is not limited to the embodiments and the like, and various modifications and improvements are possible within the scope of the technical idea of the present invention described in the claims of the patent application.
Symbol description
2. Molten metal
4. Molten glass
6. Glass ribbon
10. Float glass manufacturing device
11. Bath groove
12. Metal shell
13. Brick
15. Outlet wall
20. 20A, 20B, 20C, 20D cooling plate
21. Outside cooling part
22. Outside cooling part
23. Inside cooling part
24. Inside cooling part
31. 31B flow channel
31a vertical portion
31b horizontal portion
31c fold-back portion
32. 32B runner
33. 33A flow channel
33a vertical portion
33b horizontal part
33c fold-back portion
34. 34A flow passage
41. Inlet port
42. Outlet port
43. Supply pipe
45. Supply source
46. Flow regulating valve
47. Refrigerant temperature detector
51. Deflection measuring instrument
52. Laser displacement meter
53. Cooling device
Claims (9)
1. A float glass manufacturing apparatus, the apparatus comprising: a bath for containing molten metal for floating molten glass formed into a plate shape while flowing from an upstream side to a downstream side, an
A cooling plate that cools an outlet wall that is a downstream end portion of the bath from a downstream side;
the cooling plate has a pair of outer cooling portions provided on the outermost side in the width direction of the outlet wall and a pair of inner cooling portions provided on the innermost side in the width direction of the outlet wall;
the pair of outer cooling portions and the pair of inner cooling portions independently have flow passages for a refrigerant, the flow passages being arranged in a line-symmetrical manner about a widthwise center of the outlet wall when viewed from a flow direction of the molten glass,
the upper end portions of the pair of inner cooling portions are respectively supplied with the refrigerant flowing from the inner side in the width direction to the outer side in the width direction,
the upper end portions of the pair of outer cooling portions are configured to flow the refrigerant from the outer side in the width direction to the inner side in the width direction.
2. A float glass manufacturing apparatus according to claim 1, wherein there is a deflection gauge for measuring deflection of the outlet wall or the lower surface of the cooling plate.
3. A float glass manufacturing apparatus according to claim 2, wherein the deflection measuring instrument comprises a plurality of laser displacement meters for measuring displacement in the up-down direction of the lower surface of the outlet wall or the cooling plate,
the plurality of laser displacement meters are arranged at intervals in the width direction of the outlet wall or the cooling plate.
4. A float glass manufacturing apparatus according to claim 2, wherein there is a cooler for cooling the outlet wall from below according to the measurement value of the deflection measuring instrument.
5. A float glass manufacturing apparatus according to claim 1, wherein there is a refrigerant temperature detector for detecting a temperature of the refrigerant discharged from the flow passage of the cooling plate.
6. The float glass manufacturing apparatus according to claim 5, wherein a flow rate adjustment valve is provided for adjusting a flow rate of the refrigerant supplied to the flow passage of the cooling plate according to a detection result of the refrigerant temperature detector.
7. A float glass manufacturing apparatus according to claim 1, wherein there is a cooling plate temperature detector for detecting the temperature of the upper end portion of the cooling plate.
8. A float glass manufacturing apparatus according to claim 1, wherein the adjacent flow paths of the outer cooling portion and the adjacent flow paths of the inner cooling portion are line symmetrical about a boundary line between the outer cooling portion and the inner cooling portion when viewed in a flow direction of the molten glass.
9. A float glass production method, characterized in that a float glass is produced by using the float glass production apparatus according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210333468.7A CN114507004B (en) | 2017-02-09 | 2018-02-07 | Float glass manufacturing device and float glass manufacturing method |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-022297 | 2017-02-09 | ||
| JP2017022297 | 2017-02-09 | ||
| CN202210333468.7A CN114507004B (en) | 2017-02-09 | 2018-02-07 | Float glass manufacturing device and float glass manufacturing method |
| CN201810123544.5A CN108409111A (en) | 2017-02-09 | 2018-02-07 | Float glass manufacturing device and float glass making process |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810123544.5A Division CN108409111A (en) | 2017-02-09 | 2018-02-07 | Float glass manufacturing device and float glass making process |
Publications (2)
| Publication Number | Publication Date |
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| CN114507004A CN114507004A (en) | 2022-05-17 |
| CN114507004B true CN114507004B (en) | 2023-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210333468.7A Active CN114507004B (en) | 2017-02-09 | 2018-02-07 | Float glass manufacturing device and float glass manufacturing method |
| CN201810123544.5A Pending CN108409111A (en) | 2017-02-09 | 2018-02-07 | Float glass manufacturing device and float glass making process |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201810123544.5A Pending CN108409111A (en) | 2017-02-09 | 2018-02-07 | Float glass manufacturing device and float glass making process |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2018127393A (en) |
| KR (1) | KR20180092842A (en) |
| CN (2) | CN114507004B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120085517A (en) * | 2011-01-24 | 2012-08-01 | 주식회사 엘지화학 | Method and apparatus for cooling float bath of glass manufacturing system |
| JP2012201534A (en) * | 2011-03-24 | 2012-10-22 | Nippon Electric Glass Co Ltd | Apparatus and method for forming belt like glass |
| CN202898216U (en) * | 2012-10-31 | 2013-04-24 | 中国建材国际工程集团有限公司 | Float tin bath outlet lip plate for producing ultra-thin glass |
| CN103608307A (en) * | 2011-06-17 | 2014-02-26 | 康宁股份有限公司 | Apparatus and methods for producing a glass ribbon |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1107142A (en) * | 1964-08-31 | 1968-03-20 | Pilkington Brothers Ltd | Improvements in or relating to apparatus for manufacturing flat glass |
| KR101383603B1 (en) | 2010-06-03 | 2014-04-11 | 주식회사 엘지화학 | Apparatus and method for manufacturing float glass |
| JP2017030978A (en) * | 2013-12-18 | 2017-02-09 | 旭硝子株式会社 | Manufacturing apparatus of float glass, and manufacturing method of float glass |
-
2018
- 2018-01-12 JP JP2018003665A patent/JP2018127393A/en active Pending
- 2018-02-02 KR KR1020180013169A patent/KR20180092842A/en unknown
- 2018-02-07 CN CN202210333468.7A patent/CN114507004B/en active Active
- 2018-02-07 CN CN201810123544.5A patent/CN108409111A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120085517A (en) * | 2011-01-24 | 2012-08-01 | 주식회사 엘지화학 | Method and apparatus for cooling float bath of glass manufacturing system |
| JP2012201534A (en) * | 2011-03-24 | 2012-10-22 | Nippon Electric Glass Co Ltd | Apparatus and method for forming belt like glass |
| CN103608307A (en) * | 2011-06-17 | 2014-02-26 | 康宁股份有限公司 | Apparatus and methods for producing a glass ribbon |
| CN202898216U (en) * | 2012-10-31 | 2013-04-24 | 中国建材国际工程集团有限公司 | Float tin bath outlet lip plate for producing ultra-thin glass |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2018127393A (en) | 2018-08-16 |
| CN114507004A (en) | 2022-05-17 |
| KR20180092842A (en) | 2018-08-20 |
| CN108409111A (en) | 2018-08-17 |
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