CN114507004A - Float glass manufacturing device and float glass manufacturing method - Google Patents

Float glass manufacturing device and float glass manufacturing method Download PDF

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Publication number
CN114507004A
CN114507004A CN202210333468.7A CN202210333468A CN114507004A CN 114507004 A CN114507004 A CN 114507004A CN 202210333468 A CN202210333468 A CN 202210333468A CN 114507004 A CN114507004 A CN 114507004A
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CN
China
Prior art keywords
cooling
width direction
outlet wall
cooling plate
float glass
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Granted
Application number
CN202210333468.7A
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Chinese (zh)
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CN114507004B (en
Inventor
冈本行勉
德田直太
岩崎泰博
小室泰生
畑野慎二
泷口哲史
犬塚顺三
小林裕介
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AGC Inc
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Asahi Glass Co Ltd
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Priority to CN202210333468.7A priority Critical patent/CN114507004B/en
Publication of CN114507004A publication Critical patent/CN114507004A/en
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Publication of CN114507004B publication Critical patent/CN114507004B/en
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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
    • 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

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  • 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 having 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, the molten metal floats molten glass formed into a plate shape while flowing from an upstream side to 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 have flow paths for a coolant, respectively, and when viewed from the flow direction of the molten glass, the flow channels are arranged in line symmetry about the center in the width direction of the outlet wall, and the upper end portions of the pair of inner cooling portions are respectively supplied with the refrigerant from the inner side in the width direction to the outer side in the width direction.

Description

Float glass manufacturing device and float glass manufacturing method
This application is a divisional application of the chinese patent application entitled "float glass manufacturing apparatus and float glass manufacturing method" having a national application number of 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, in order to prevent deformation of the end frame of the float bath, a frame deformation preventing jacket is provided on the outer surface of the frame. The jacket has an inlet port and an outlet port with a gas passage provided therebetween. An inert gas such as nitrogen is supplied from a gas supply source to the inlet port, and the inert gas is circulated through the gas passage and then discharged from the outlet port. 2 gas channels are illustrated.
Documents of the prior art
Patent document
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 molten glass shaped into a plate while flowing from the upstream side to the downstream side. The bath has an outlet wall at a downstream end. The upper surface of the outlet wall is slightly above the level of the molten metal. The height difference is set to a value as low 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 at the center portion in the width direction of the upper surface of the outlet wall. The greater the temperature difference of the outlet wall, the greater the deformation of the lower surface of the outlet wall, with the result that 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. This can suppress deformation of the upper surface of the outlet wall, and can suppress leakage of the molten metal from the upper surface of the outlet wall.
However, a large-area glass plate is required for the screen enlargement of a display device. To produce a large area of glass sheet, the width of the glass ribbon, and thus the width of the outlet wall, needs to be increased.
In order to cope with the enlargement of the width of the outlet wall, improvement in the structure of the cooling plate is required.
The invention aims to provide a float glass manufacturing device capable of inhibiting molten metal from leaking from a bath.
Technical scheme for solving technical problem
The invention provides a float glass manufacturing device, comprising: a bath containing molten metal in which molten glass formed into a plate shape floats while flowing from an upstream side to a downstream side, and a cooling plate that is an outlet wall of a downstream end portion of the bath is cooled 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 have flow paths for the coolant independently, and the flow paths are arranged in line symmetry about the center in the width direction of the outlet wall when viewed in the flow direction of the molten glass.
Effects of the invention
The float glass manufacturing apparatus of the present invention can suppress leakage of molten metal from the bath.
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 according to the first embodiment as viewed from the downstream side.
Fig. 3 is a view of the internal structure of the cooling plate according to the second embodiment as viewed from the downstream side.
Fig. 4 is a view of the internal structure of the cooling plate according to the third embodiment as viewed from the downstream side.
Fig. 5 is a view of the internal structure of the cooling plate according to the fourth embodiment as 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 as 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 components are denoted by the same or corresponding reference numerals, and description thereof is omitted.
(outline of manufacturing apparatus for float glass)
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 that contains molten metal 2 on which molten glass 4 floats. The molten glass 4 is continuously supplied onto the molten metal 2 contained in the bath 11, and is formed into a glass ribbon 6 in a plate shape while flowing from the upstream side to the downstream side on the molten metal 2. The glass ribbon 6 is gradually cooled and solidified while flowing in the direction of arrow a above the liquid surface of the molten metal 2. The glass ribbon 6 is pulled up from the molten metal 2 in the downstream area of the bath 11 and sent to the lehr. The glass ribbon 6 annealed by the annealing furnace is cut into a prescribed size, thereby producing a glass sheet (float glass).
As shown in fig. 1, the 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 casing 12 and a plurality of bricks 13 covering the inside of the metal casing 12. The multiple 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 higher than the surface level of the molten metal 2. The height difference is set to a value as low 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 at the center portion in the width direction of the upper surface 15a of the outlet wall 15. The greater the temperature difference of the outlet wall 15, the greater 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, the cooling plate 20 that cools the outlet wall 15 from the downstream side is used. This can suppress deformation of the upper surface 15a of the outlet wall 15, and 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 required for the screen enlargement of a display device. To manufacture 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 explained below. The cooling plate 20 of the present invention is particularly effective when the width of the glass ribbon 6 is 5000mm or more, but 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 plate according to the second to fourth embodiments, as 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 as 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 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 path 31 to 34. The cooling plate 20 may be divided into regions 21 to 24 as shown in FIG. 2, or may be formed integrally. In the present specification, the width direction means a horizontal direction perpendicular to the flow direction of the molten glass 4.
Hereinafter, the pair of regions 21 and 22 provided on the outermost sides in the width direction of the outlet wall 15 will be referred to as a pair of outer cooling portions 21 and 22. The pair of regions 23 and 24 provided on the innermost side in the width direction of the outlet wall 15 are referred to as a pair of inner cooling portions 23 and 24.
The pair of outer cooling sections 21, 22 and the pair of inner cooling sections 23, 24 have refrigerant flow paths 31 to 34 independently. Specifically, one outer cooling unit 21 has a flow passage 31, the other outer cooling unit 22 has a flow passage 32, one inner cooling unit 23 has a flow passage 33, and the other inner cooling unit 24 has a flow passage 34.
The cooling plate 20 has 4 flow channels 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 in the related art, whereby the cooling capacity of the cooling plate 20 can be improved, and the temperature difference of the outlet wall 15 can be reduced. Further, the number of flow paths arranged in the width direction of the outlet wall 15 is increased from 2 to 4 in the related art, whereby the temperature distribution in the width direction of the outlet wall 15 can be finely adjusted.
The flow paths 31 and 32 of the pair of outer cooling portions 21 and 22 are line-symmetric about the center in the width direction when viewed from the flow direction of the molten glass 4. Further, the flow paths 33, 34 of the pair of inner cooling portions 23, 24 are line-symmetrical with respect to the center in the width direction of the outlet wall 15 when viewed from the flow direction of the molten glass 4.
That is, the 4 flow paths 31 to 34 are line-symmetrical about the center in the width direction 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 line symmetry with the center in the width direction as the center. Therefore, the deformation of the lower surface 15b of the outlet wall 15 can be suppressed, and as a result, the deformation of the upper surface 15a of the outlet wall 15 can be suppressed. Thereby making it possible to suppress leakage of the molten metal 2 from the upper surface 15a of the outlet wall 15.
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 channel, but may be divided into an even number of regions of 6 or more in the width direction of the outlet wall 15, each region having a refrigerant flow channel. In this case, the even-numbered 6 or more flow paths are line-symmetrical about the center in the width direction 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 at the center portion in the width direction of the upper surface 15a of the outlet wall 15. The refrigerant flowing inside the cooling plate 20 absorbs heat from the cooling plate 20 as it flows from the inlet to the outlet. Therefore, the more from the inlet toward the outlet, the higher the temperature of the refrigerant, and the lower the cooling capacity of the refrigerant.
Accordingly, the refrigerant may flow from the inside in the width direction to the outside in the width direction at the upper end portions of the pair of inner cooling portions 23 and 24. This allows the heat of the widthwise central portion of the upper surface 15a of the outlet wall 15 to be absorbed by the refrigerant having a low temperature and a high cooling capacity, thereby further reducing the temperature difference of the outlet wall 15.
On the other hand, the refrigerant may flow from the outside in the width direction to the inside in the width direction at the upper end portions of the pair of outer cooling portions 21 and 22. 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.
When viewed from the flow direction of molten glass 4, flow path 31 of outer cooling unit 21 and flow path 33 of inner cooling unit 23 adjacent to each other are formed in line symmetry with respect to the boundary line between outer cooling unit 21 and inner cooling unit 23. Similarly, when viewed from the flow direction of molten glass 4, flow path 32 of outer cooling unit 22 and flow path 34 of inner cooling unit 24 adjacent to each other are formed in line symmetry with respect to the boundary line between outer cooling unit 22 and inner cooling unit 24. The respective inlet ports 41 can be pooled and the respective outlet ports 42 can be pooled.
The length of the outlet wall 15 in the width direction is preferably 5500mm or more, and more preferably 6000mm or more. The reason is that the glass substrate for large-sized liquid crystal displays, such as 2500mm × 2200mm (G8), 3130mm × 2880mm (G10), 3370mm × 2940mm (G10.5), is efficiently produced. Therefore, the cooling plate 20 for cooling the outlet wall 15 also preferably has a width-directional length of 5500mm or more, more preferably 6000mm or more.
The cooling plate 20A of fig. 3 is similar to the cooling plate 20 of fig. 2 in that the refrigerant flows from the outside in the width direction to the inside in the width direction in the upper end portions of the pair of outer cooling portions 21 and 22. On the other hand, the cooling plate 20A is different from the cooling plate 20 in that the refrigerant flows from the outside in the width direction to the inside in the width direction in the upper end portions of the pair of inner cooling portions 23 and 24, respectively.
The cooling plate 20B of fig. 4 differs from the cooling plate 20 of fig. 2 in that the coolant flows from the inside in the width direction to the outside in the width direction in the upper end portions of the pair of outside cooling portions 21, 22. The cooling plate 20B is different from the cooling plate 20 in that the coolant flows from the outside in the width direction to the inside in the width direction in the upper end portions of the pair of inner cooling portions 23 and 24.
The cooling plate 20C of fig. 5 differs from the cooling plate 20 of fig. 2 in that the coolant flows from the inside in the width direction to the outside in the width direction in the upper end portions of the pair of outer cooling portions 21 and 22. On the other hand, the cooling plate 20C is similar to the cooling plate 20 in that the coolant flows from the inside in the width direction to the outside in the width direction in the upper end portions of the pair of inner cooling portions 23 and 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 inlet port 41 and the outlet port 42 of the refrigerant of the cooling plate 20D and the cooling plate 20 are reversed. Therefore, the coolant flows from the inside in the width direction to the outside 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 coolant flows from the outside in the width direction to the inside in the width direction in the upper end portions of the pair of inner cooling portions 23 and 24.
(Structure of flow channel of inner Cooling part)
The structure of the flow passages 33, 33A of one inner cooling portion 23 will be described. The flow passages 34, 34A of the other inner cooling portion 24 have the same configuration, and therefore, the description thereof is omitted.
One end of the flow passage 33 is connected to a refrigerant inlet port 41, and the other end is connected to a refrigerant outlet port 42. The refrigerant flowing through the flow passage 33 may be any of a gas such as air and nitrogen, and a liquid such as water.
The inlet port 41 is connected to a refrigerant supply source 45 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 in the middle of 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 33 b. The refrigerant flows from the lower side to the upper side in the vertical portion 33a, and flows into the horizontal portion 33 b.
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 to each other in the vertical direction. The refrigerant repeats the operation of flowing from the upper horizontal portion 33b to the lower horizontal portion 33b via the folded portion 33 c. One end in the width direction of the lowermost horizontal portion 33b is connected to the outlet port 42.
The outlet port 42 is provided, for example, in the lower surface of the inner cooling portion 23, for example, at one end in the width direction of the lower surface. The other end in the width direction of the lower surface is provided with an inlet port 41. A refrigerant temperature detector 47 for detecting the temperature of the refrigerant discharged from the flow passage 33 is provided at the outlet port 42.
The flow passage 33A of fig. 3 and 4 differs from the flow passage 33 of fig. 2 in that the positions of the inlet port 41 and the outlet port 42 of the refrigerant are reversed. 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 33 c.
In the flow passage 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 33 a.
Further, a flow regulating plate may be provided in the middle of the flow passages 33 and 33A. In addition, a part of the wall surface of the horizontal portion 33b in the cross-sectional view may be curved instead of a straight line.
(Structure of flow channel of outer Cooling part)
The structure of the flow passages 31, 31B of one outer cooling portion 21 will be described. The flow passages 32, 32B of the other outer cooling portion 22 have the same configuration, and therefore, the description thereof is omitted.
One end of the flow channel 31 is connected to a refrigerant inlet port 41, and the other end is connected to a refrigerant outlet port 42. The refrigerant flowing through flow channel 31 may be different from the refrigerant flowing through flow channel 33, or may be the same as the refrigerant flowing through flow channel 33.
The inlet port 41 is connected to a refrigerant supply source 45 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 in the middle of the supply pipe 43. The inlet port 41 is provided, for example, on the lower surface of the outside 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 31 b. The refrigerant flows from the lower side to the upper side in the vertical portion 31a, and flows into the horizontal portion 31 b.
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 to each other in the vertical direction. The refrigerant repeats the operation of flowing from the upper horizontal portion 31b to the lower horizontal portion 31b via the folded portion 31 c. One end in the width direction of the lowermost horizontal portion 31b is connected to the outlet port 42.
The outlet port 42 is provided, for example, in the lower surface of the outer cooling portion 21, for example, at one end in the width direction of the lower surface. The other end in the width direction of the lower surface is provided with an inlet port 41. A refrigerant temperature detector 47 for detecting the temperature of the refrigerant discharged from the flow channel 31 is provided at the outlet port 42.
The flow passage 31B of fig. 4 and 5 differs from the flow passage 31 of fig. 2 in that the positions of the inlet port 41 and the outlet port 42 of the refrigerant are reversed. 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 31 c.
In the flow channel 31 of 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 31 a.
The inlet port 41 may be provided not on the lower surface of the outer cooling portion 21 but on the surface facing outward in the width direction 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 rectifying plate may be provided in the middle of the flow passages 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 outer cooling portion 21 but on the surface facing outward in the width direction 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 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, and is, 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 temperature difference between the maximum temperature and the minimum temperature of the upper end portion of the cooling plate 20 is, for example, 100 ℃. The temperature of the upper end of the cooling plate 20 tends to be lowest at the ends in the width direction.
The temperature difference between the temperature of the upper end of the cooling plate 20 and the temperature of the lower end of the cooling plate 20 is, for example, 150 ℃. Here, the temperature difference between the upper end portion and the lower end portion is measured between the same 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 refrigerant temperature detector and detection result thereof)
The coolant temperature detector 47 detects the temperature of the coolant discharged from each of the flow channels 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 detection temperature of the refrigerant temperature detector 47 indicates the amount of heat transferred from the cooling plate 20 to the refrigerant. The more this amount of heat, 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, and may be provided in the middle of a discharge pipe 48 that conveys the refrigerant from the outlet port 42 to the outside. The refrigerant temperature detector 47 may detect the temperature of the refrigerant discharged from each of the flow passages 31 to 34.
The temperature detected by the refrigerant temperature detector 47 is used for controlling the flow rate adjustment valve 46, the alarm device 71, and the like.
The flow rate adjustment valve 46 adjusts the flow rate of the refrigerant supplied to each of the flow channels 31 to 34 of the cooling plate 20 based on the temperature detected by 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, which is the target of the flow rate adjustment, falls within the allowable range. This can suppress temperature changes of the cooling plate 20, and can stabilize the quality of the glass ribbon 6.
The alarm device 71 issues an alarm when the detected temperature of the refrigerant temperature detector 47 is out of the allowable range, for example. This makes it possible to notify the user of the shortage of the refrigerant flow rate. In addition, 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 temperature detected by the refrigerant temperature detector 47 may be displayed on a display device 72 such as a liquid crystal display. Thereby improving user convenience. The display device 72 may also be provided with an alarm device 71, and the alarm may be given as an image. In addition, the 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.
(deflection measuring apparatus and utilization of measured value thereof)
The deflection gage 51 is used to measure the deflection of the lower surface 15b of the mouth wall 15, as shown in fig. 1. The deflection of the lower surface 15b is represented by, for example, the displacement of the center portion in the width direction of the lower surface 15b relative to a straight line connecting both end portions in the width direction of the lower surface 15 b.
The deflectometer 51 includes, for example, a plurality of laser displacement meters 52 for measuring the vertical displacement of the lower surface 15b of the mouth wall 15. The plurality of laser displacement meters 52 are provided at intervals in the width direction of the outlet wall 15.
By measuring the deflection of the lower surface 15b of the mouth wall 15 with the deflection measuring instrument 51, the deflection of the upper surface 15a of the mouth wall 15 can be estimated. This makes it possible to detect the difference in level between the upper surface 15a of the port wall 15 and the liquid surface of the molten metal 2 with good accuracy.
In the present embodiment, the deflectometer 51 includes a plurality of laser displacement meters 52, and may include a strain gauge or the like. The deflectometer 51 may measure the deflection of the lower surface of the cooling plate 20 and measure the displacement of the center portion of the lower surface in the width direction. 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 flexed, the cooling plate 20 is also flexed. The greater the deflection of the outlet wall 15, the greater the deflection of the cooling plate 20.
The measured value of the deflectometer 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 relative 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 according to the measurement value of the deflectometer 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 relatively upward with respect to a straight line connecting both end portions in the width direction of the lower surface 15 b. As a result, the widthwise central portion of the upper surface 15a can be displaced relatively upward with respect to the straight line connecting both ends in the widthwise direction 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 measurement value of the deflectometer 51 is out of the allowable range, the cooler 53 cools the outlet wall 15 from below, and in the case where the measurement value of the deflectometer 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 an experiment or the like, and when the measured value of the deflectometer 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 jets air toward the lower surface 15b of the outlet wall 15 to cool the outlet wall 15 from below. The water-cooling jacket is attached to the lower surface 15b of the outlet wall 15, and the outlet wall 15 is cooled from below by supplying water to the inside of the water-cooling jacket.
The alarm device 71 issues an alarm when the measurement value of the deflectometer 51 is out of the allowable range, for example. The alarm device 71 activates the cooler 53 based on the measured value of the deflectometer 51, for example, and gives an alarm when the measured value of the deflectometer 51 is out of the allowable range. In addition, the alarm device 71 does not issue an alarm when the measurement value of the deflectometer 51 is within the allowable range.
The measured value of the deflectometer 51 may be displayed on a display device 72 such as a liquid crystal display. Thereby improving user convenience. The display device 72 may also be provided with an alarm device 71, and the alarm may be given as an image. In addition, the alarm may also be sounded.
The above description of the deflectometer 51 and the use of the measured value thereof is also applied 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 utilization thereof)
The cooling plate temperature detector 55 is, as shown in fig. 2, for detecting the temperature of the upper end portion of the cooling plate 20. The cooling plate temperature detector 55 detects the temperature of the width direction end portion of the upper end portion of the cooling plate 20, for example. The temperature detected by the cooling plate temperature detector 55 is used for controlling the flow rate adjustment valve 46, controlling the alarm device 71, and the like.
The flow rate adjustment valve 46 adjusts the flow rate of the coolant supplied to each of the flow channels 31 to 34 of the cooling plate 20 based on the temperature detected by 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 issues an alarm when the detected temperature of the cooling plate temperature detector 55 is out of the allowable range, for example. Thereby, the user can be notified of the shortage of the refrigerant flow rate and the like. In addition, 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 user convenience. The display device 72 may also be provided with an alarm device 71, and the alarm may be given as an image. In addition, the alarm may also be sounded.
The cooling plate temperature detector 55 is not limited to the widthwise end portion of the upper end portion of the cooling plate 20, and may detect the temperature of the widthwise central 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. Further, control device 60 receives signals from the outside through input interface 63 and transmits signals to the outside through output interface 64. The controller 60 is used to control the flow rate adjustment valve 46, the cooler 53, the alarm device 71, the display device 72, and the like.
(float glass production method)
Next, referring again to fig. 1, a method for manufacturing float glass using the float glass apparatus 10 having the above-described configuration will be described.
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 sheet-like glass ribbon 6 on the molten metal 2. The glass ribbon 6 is gradually cooled and solidified while flowing from the upstream side to the downstream side on the liquid surface of the molten metal 2. The glass ribbon 6 is pulled up from the molten metal 2 in the downstream region of the bath 11 and conveyed to the annealing furnace. The glass ribbon 6 annealed by the lehr is cut into a prescribed size, thereby producing a glass sheet. The produced glass sheet is useful as, for example, a glass substrate for a display, a cover glass for a display, and a window glass.
When the glass plate produced is used as a glass substrate for a display, particularly a glass substrate for a liquid crystal display, it may be alkali-free glass. The alkali-free glass is substantially free of Na2O、K2O、Li2And alkali metal oxide glasses 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 still more preferably 10 μm or less.
The alkali-free glass contains SiO in the mass% based on the oxide, for example2:50％～73％、Al2O3:10.5％～24％、B2O3:0％～12％、MgO:0％～10％、CaO:0％～14.5％、SrO:0％～24％、BaO:0％～13.5％、MgO+CaO+SrO+BaO:8％～29.5％、ZrO2:0％～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 oxides2:58％～66％、Al2O3:15％～22％、B2O3:5％～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 an amount of mass% based on the oxide2:54％～73％、Al2O3:10.5％～22.5％、B2O3:0％～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 plate is used as a cover glass for a display, it may be a glass for chemical strengthening. The glass for chemical strengthening is used as a cover glass after being subjected to chemical strengthening treatment. The chemical strengthening treatment is performed to form a compressive stress layer having a predetermined depth from the glass surface by replacing ions having a small ionic radius (for example, Na ions) with ions having a large ionic radius (for example, K ions) among the alkali metal ions contained in the glass surface.
The glass for chemical strengthening contains SiO in mol% based on oxide2:62％～68％、Al2O3:6％～12％、MgO:7％～13％、Na2O:9％～17％、K20 to 7 percent of O and Na2O and K2Total O content minus Al2O3Less than 10% by weight of a ZrO content2When the content is less than 0.8%.
Another glass for chemical strengthening contains SiO in mol% based on the oxide2:65％～85％、Al2O3:3％～15％、Na2O:5％～15％、K2More than 0% and less than 2% of O, 0-15% of MgO, and ZrO2:0％～1％，SiO2And Al2O3SiO is the sum of the contents of2+Al2O3Below 88%.
In the case where the glass sheet produced is used as a window glass, it may be soda lime glass. The soda-lime glass contains SiO in the mass% based on the oxide2:65％～75％、Al2O3:0％～3％、CaO:5％～15％、MgO:0％～15％、Na2O:10％～20％、K2O:0％～3％、Li2O:0％～5％、Fe2O3:0％～3％、TiO2:0％～5％、CeO2:0％～3％、BaO:0％～5％、SrO:0％～5％、B2O3:0％～5％、ZnO:0％～5％、ZrO2:0％～5％、SnO2:0％～3％、SO3:0％～0.5％。
(modification, improvement)
While the embodiment of the float glass manufacturing apparatus and the like have been described above, the present invention is not limited to the above-described embodiment and the like, and various modifications and improvements can be made within the scope of the technical idea of the present invention described in the claims of the patent application.
Description of the symbols
2 molten Metal
4 molten glass
6 glass ribbon
10 float glass manufacturing device
11 bath tub
12 metal shell
13 brick
15 outlet wall
20. 20A, 20B, 20C, 20D cooling plate
21 outer cooling part
22 outer cooling part
23 inner side cooling part
24 inner cooling part
31. 31B flow channel
31a vertical part
31b horizontal part
31c turn-back part
32. 32B flow passage
33. 33A flow passage
33a vertical part
33b horizontal part
33c folded part
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 cooler

Claims (10)

1. A float glass manufacturing apparatus, comprising: a bath containing molten metal in which molten glass formed into a plate shape floats while flowing from an upstream side to a downstream side, an
A cooling plate for cooling an outlet wall which 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 sides in the width direction of the outlet wall and a pair of inner cooling portions provided on the innermost sides in the width direction of the outlet wall;
the pair of outer cooling portions and the pair of inner cooling portions have flow paths for the coolant independently, and the flow paths are arranged in line symmetry about the center in the width direction of the outlet wall when viewed in the flow direction of the molten glass,
the refrigerant flows from the inside in the width direction to the outside in the width direction at the upper end portions of the pair of inner cooling portions, respectively.
2. The float glass manufacturing apparatus according to claim 1, wherein the refrigerant flows from the outer side in the width direction to the inner side in the width direction at upper end portions of the pair of outer cooling portions, respectively.
3. The float glass manufacturing apparatus of claim 1 or 2, having a deflectometer for measuring the deflection of the outlet wall or the lower surface of the cooling plate.
4. The float glass manufacturing apparatus according to claim 3, wherein the deflectometer comprises a plurality of laser displacement meters for measuring the displacement in the up-down direction of the outlet wall or the lower surface of the cooling plate,
the plurality of laser displacement meters are provided at intervals in the width direction of the outlet wall or the cooling plate.
5. The float glass manufacturing apparatus of claim 3, having a cooler that cools the outlet wall from below based on the measurement of the deflectometer.
6. The float glass manufacturing apparatus according to claim 1 or 2, wherein there is a refrigerant temperature detector for detecting a temperature of the refrigerant discharged from the flow channel of the cooling plate.
7. The float glass manufacturing apparatus according to claim 6, comprising a flow rate adjustment valve that adjusts a flow rate of the coolant supplied to the flow channel of the cooling plate based on a detection result of the coolant temperature detector.
8. The float glass manufacturing apparatus according to claim 1 or 2, wherein there is a cooling plate temperature detector for detecting the temperature of the upper end portion of the cooling plate.
9. The float glass manufacturing apparatus according to claim 1 or 2, wherein the flow path of the outer cooling portion and the flow path of the inner cooling portion which are adjacent to each other are formed in line symmetry about a boundary line between the outer cooling portion and the inner cooling portion when viewed in a flow direction of the molten glass.
10. A method for manufacturing float glass, characterized in that float glass is manufactured by using the float glass manufacturing apparatus according to any one of claims 1 to 9.
CN202210333468.7A 2017-02-09 2018-02-07 Float glass manufacturing device and float glass manufacturing method Active CN114507004B (en)

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Citations (4)

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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

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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

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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

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