CN110615601A - Float glass manufacturing device and float glass manufacturing method - Google Patents
Float glass manufacturing device and float glass manufacturing method Download PDFInfo
- Publication number
- CN110615601A CN110615601A CN201910514736.3A CN201910514736A CN110615601A CN 110615601 A CN110615601 A CN 110615601A CN 201910514736 A CN201910514736 A CN 201910514736A CN 110615601 A CN110615601 A CN 110615601A
- Authority
- CN
- China
- Prior art keywords
- plate spring
- spring main
- axial direction
- float glass
- main body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B35/00—Transporting of glass products during their manufacture, e.g. hot glass lenses, prisms
- C03B35/14—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands
- C03B35/16—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands by roller conveyors
- C03B35/168—Means for cleaning the rollers
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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
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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
- C03B18/04—Changing or regulating the dimensions of the molten glass ribbon
- C03B18/06—Changing or regulating the dimensions of the molten glass ribbon using mechanical means, e.g. restrictor bars, edge rollers
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B35/00—Transporting of glass products during their manufacture, e.g. hot glass lenses, prisms
- C03B35/14—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands
- C03B35/16—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands by roller conveyors
- C03B35/166—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands by roller conveyors specially adapted for both flat and bent sheets or ribbons
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B35/00—Transporting of glass products during their manufacture, e.g. hot glass lenses, prisms
- C03B35/14—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands
- C03B35/16—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands by roller conveyors
- C03B35/167—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands by roller conveyors specially adapted for removing defect sheets, ribbons or parts thereof
Abstract
The invention relates to a float glass manufacturing device and a float glass manufacturing method, and provides a float glass manufacturing device which can sufficiently remove tin or tin oxide adhered to a lifting roller by providing an elastic support body with an elastic restoring force which is difficult to reduce even if the float glass manufacturing device is continuously used for a long time. A float glass manufacturing apparatus (1) is provided with a float bath (10), a scum box (20), and a slow cooling furnace (30), and is characterized in that the scum box (20) is provided with a removing member (23) which is in contact with a lifting roller (21) and an elastic support body (25) which supports the removing member (23), the elastic support body (25) is provided with a plurality of elastic bodies which are arranged at intervals along the axial direction of the lifting roller (21), and a stand (26) which is arranged on the elastic bodies, the plurality of elastic bodies are formed into a plurality of rows along the conveying direction of a glass ribbon (G), and the plurality of elastic bodies are arranged at intervals in the conveying direction.
Description
Technical Field
The present invention relates to a float glass manufacturing apparatus and a float glass manufacturing method.
Background
In the production of glass sheets by the float process, molten glass is supplied from a glass melting furnace to a molten tin bath called a molten metal bath, a glass ribbon is formed on the molten tin bath, and then the glass ribbon is conveyed by a conveying roller called a lift roller and transferred to a slow cooling furnace. In general, a defect called dross (tin and tin oxide) is adhered to the lower surface of the glass ribbon.
Glass sheets used for Flat Panel Display (FPD) applications such as Liquid Crystal Displays (LCD) have high quality requirements for scum defects.
Therefore, in patent document 1, the carbon removing member is brought into contact with the lower portion of the lift roller by the elastic restoring force of the plate spring as the elastic support body, and the tin or tin oxide adhering to the lift roller is scraped off and removed.
[ Prior Art document ]
[ patent document ]
[ patent document 1 ] Japanese patent application laid-open No. Hei 11-335127
[ problem to be solved by the invention ]
However, since the plate spring is exposed to a high-temperature atmosphere, if the plate spring is used for a long period of time, the elastic restoring force is reduced, and the removing member may not sufficiently remove tin or tin oxide adhering to the lift roller. As a result, there is a problem that tin or tin oxide adhering to the lift roller is transferred to the lower surface of the glass ribbon, and a scum defect occurs.
Disclosure of Invention
The present invention has been made in view of the above problems, and an object of the present invention is to provide a float glass manufacturing apparatus and a float glass manufacturing method capable of sufficiently removing tin or tin oxide adhering to a lift roller by providing an elastic support body whose elastic restoring force is less likely to decrease even if the float glass is used for a long period of time.
[ MEANS FOR solving PROBLEMS ] A method for solving the problems
The present invention provides a float glass manufacturing apparatus including a float bath for forming a glass ribbon on molten metal, a dross box adjacent to the float bath, and a slow cooling furnace adjacent to the dross box, wherein the dross box includes a lift roller for lifting the glass ribbon, a removing member in contact with the lift roller, and an elastic support body for supporting the removing member, the elastic support body includes a plurality of elastic bodies provided at intervals along an axial direction of the lift roller, and a mount disposed on the elastic bodies, the plurality of elastic bodies are arranged in a plurality of rows along a conveying direction of the glass ribbon, and the plurality of elastic bodies are disposed at a position offset in the conveying direction.
The present invention also provides a float glass manufacturing method of continuously supplying molten glass onto molten metal in a molten metal bath, forming a glass ribbon on the molten metal, drawing out the glass ribbon from the molten metal bath by lift rollers provided in a dross box, and carrying and slowly cooling the glass ribbon by annealing rollers provided in a slow cooling furnace, wherein a removing member is elastically brought into contact with the lift rollers by using an elastic support body in the dross box, the elastic support body including a plurality of elastic bodies provided at intervals in an axial direction of the lift rollers, and a stand disposed on the elastic bodies, the plurality of elastic bodies being arranged in a plurality of rows in a carrying direction of the glass ribbon, and the plurality of elastic bodies being disposed at intervals in the carrying direction.
[ Effect of the invention ]
According to the present invention, there are provided a float glass manufacturing apparatus and a float glass manufacturing method capable of sufficiently removing tin or tin oxide adhering to a lift roller by providing an elastic support body whose elastic restoring force is less likely to decrease even if the float glass is used for a long period of time.
Drawings
Fig. 1 is a sectional view of a float glass manufacturing apparatus according to a first embodiment of the present invention.
Fig. 2 shows an elastic support body and a removing member according to a first embodiment of the present invention, (a) is a plan view showing a positional relationship between a plate spring main body and a mount, (B) is a sectional view of the plate spring main body and the mount and the removing member on the upstream side in the conveying direction, and (C) is a sectional view of the plate spring main body and the mount and the removing member on the downstream side in the conveying direction.
Fig. 3 shows a leaf spring body according to a first embodiment of the present invention, (a) is a cross-sectional view of a leaf spring body having 1 inclined portion, and (B) is a cross-sectional view of a leaf spring body having 2 inclined portions.
Fig. 4 shows an elastic support body and a removing member according to a second embodiment of the present invention, (a) is a plan view showing a positional relationship between a plate spring main body and a mount, (B) is a sectional view of the plate spring main body and the mount and the removing member on the upstream side in the conveying direction, and (C) is a sectional view of the plate spring main body and the mount and the removing member on the downstream side in the conveying direction.
Fig. 5 shows a conventional elastic support body and a removing member, where (a) is a plan view showing a positional relationship between a plate spring main body and a mount, and (B) is a cross-sectional view of the plate spring main body, the mount, and the removing member.
[ Mark Specification ]
1 float glass manufacturing device
10 molten metal bath
11 bath tub
20 scum box
21 lifting roller
23 removal member
25 elastic support
26 stand
27 leaf spring body
27A first flat portion
27B inclined part
27C second flat portion
28 support member
30 slow cooling furnace
31 annealing roller
G glass ribbon
M molten metal
Detailed Description
Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the present specification, "to" indicating a numerical range means a range including the numerical values before and after it.
In the drawings, an XYZ coordinate system is appropriately represented as a three-dimensional orthogonal coordinate system.
In the present specification, the X-axis direction is a conveying direction of the glass ribbon G in a plan view, the Y-axis direction is a direction (sheet width direction) orthogonal to the conveying direction of the glass ribbon G in a plan view, and the Z-axis direction is a vertical direction. The upstream side and the downstream side are the upstream side and the downstream side with respect to the X-axis direction, the + X side is the downstream side, and the-X side is the upstream side. One and the other are the + Y side and the-Y side with respect to the Y axis direction. The longitudinal section is an XZ plane, and the cross section is a YZ plane.
[ float glass manufacturing apparatus ]
(first embodiment)
Fig. 1 is a sectional view of a float glass manufacturing apparatus according to a first embodiment of the present invention. A float glass production apparatus according to a first embodiment of the present invention will be described with reference to fig. 1.
The float glass manufacturing apparatus 1 includes, from the upstream side, a float bath 10, a dross box 20 adjacent to the float bath 10, and a slow cooling furnace 30 adjacent to the dross box 20.
The molten metal bath 10 includes a bath 11 for containing molten metal M, and forms continuously supplied molten glass into a glass ribbon G on the molten metal M. The molten glass is a material obtained by melting a glass raw material in a glass melting furnace disposed on the upstream side (on the X side) of the molten metal bath 10 and further performing a fining process.
The upper space of the liquid metal tank 10 is filled with a reducing gas containing nitrogen and hydrogen, and is set to a pressure higher than atmospheric pressure. This is to prevent the inflow of air from the outside and to prevent oxidation of the molten metal M.
The dross box 20 includes: a lift roller 21 that lifts the glass ribbon G; a removing member 23 abutting against the lift roller 21; an elastic support 25 for supporting the removing member 23; and a support member 28 for supporting the elastic support 25.
The lift-up roller 21 is driven to rotate by a driving device (not shown) such as a motor, and conveys the glass ribbon G obliquely upward by its driving force. The removing member 23 removes a scum defect attached to the lifting roller 21. The support member 28 is disposed on the bottom wall of the dross box 20, and has a longitudinal cross-sectional shape (XZ plane) in the shape of コ. This can prevent the positions of the removing member 23 and the elastic support 25 from being shifted in the conveyance direction (X-axis direction) of the glass ribbon G. Here, a refrigerant pipe (for example, a water pipe) is preferably provided between the support member 28 and the elastic support body 25 along the axial direction (Y-axis direction) of the lift roller 21. This can cool the elastic support body 25, and prevent the elastic support body 25 from being deformed by the hot gas in the dross box 20.
The number of lift rollers shown in fig. 1 is 3, but may be 2, or 4 or more.
The dross box 20 may be provided with a heater on the ceiling or the bottom wall in order to adjust the temperature of the glass ribbon G.
The inner space of the dross box 20 is a non-oxidizing atmosphere (a reducing gas, an inert gas, or a mixed gas thereof). Hydrogen or acetylene gas is preferred as the reducing gas, and nitrogen or argon gas is preferred as the inert gas. The oxygen concentration in the internal space of the dross box 20 is preferably 100ppm or less, and more preferably 20ppm or less.
The annealing furnace 30 gradually cools the glass ribbon G to a temperature equal to or lower than the strain point temperature of the glass while conveying the glass ribbon G by the annealing rolls 31 to obtain plate glass. The annealing furnace 30 includes heaters (not shown) on the ceiling and the bottom wall to adjust the temperature of the glass ribbon G. The annealing roller 31 is driven to rotate by a driving device (not shown) such as a motor, and conveys the glass ribbon G in the horizontal direction by its driving force. The gradually cooled plate glass is cut into a desired size by a cutting device to obtain a glass plate.
Since the slow cooling furnace 30 is opened to the outside by the outlet on the downstream side (+ X side), the internal space is an oxidizing atmosphere. The interior of the slow cooling furnace 30 communicates with the interior of the molten metal bath 10 via the interior of the dross box 20.
The diameter of the lift roller 21 or the annealing roller 31 (hereinafter collectively referred to as "conveyance roller") is preferably 100 to 500mm, and more preferably 200 to 500 mm. When the diameter is 100mm or more, the circumferential speed of the transport roller can be increased without applying a load to the driving device. Further, if the diameter is 500mm or less, the distance between the conveyance roller and the adjacent conveyance roller can be shortened, and the deformation of the glass ribbon G between the conveyance rollers can be suppressed. In particular, since the glass ribbon G having a thickness of 2mm or less is easily deformed between the conveying rollers, it is preferable to use the conveying rollers having a diameter of 500mm or less.
The length of the main body in the axial direction (Y-axis direction) of the transport roller is preferably 5000mm or more, and more preferably 5500mm or more. When the length of the main body is 5000mm or more, the width of the glass ribbon G can be widened, and float glass can be efficiently produced.
The transfer roll is made of various ceramics of oxide, carbide, and nitride, or stainless steel. Specific examples of the ceramics include zirconium oxide (ZrO)2) Zirconia-based ceramic containing alumina (Al) as main component2O3) Alumina-based ceramic containing silicon oxide (SiO) as main component2) A silica-based ceramic as a main component.
Fig. 2 shows an elastic support body and a removing member according to a first embodiment of the present invention, (a) is a plan view showing a positional relationship between a plate spring main body and a mount, (B) is a sectional view of the plate spring main body and the mount and the removing member on the upstream side in the conveying direction, and (C) is a sectional view of the plate spring main body and the mount and the removing member on the downstream side in the conveying direction. Fig. 3 shows a leaf spring body according to a first embodiment of the present invention, where (a) is a cross-sectional view of the leaf spring body having 1 inclined portion, and (B) is a cross-sectional view of the leaf spring body having 2 inclined portions. The elastic support body and the removing member according to the first embodiment of the present invention will be described with reference to fig. 2(a) to (C) and fig. 3(a) and (B).
The elastic support body 25 and the 3 removing members 23 shown in fig. 2(a) to (C) are arranged along the axial direction (Y-axis direction) of the lift roller. The axial direction of the lift roller of the present embodiment is the same direction as the sheet width direction of the glass ribbon.
The elastic support 25 includes a plurality of elastic bodies provided at intervals in the axial direction (Y-axis direction) of the lift roller, and a mount 26 disposed on the elastic bodies. The elastic bodies are arranged in a plurality of rows along the conveying direction (X-axis direction) of the glass ribbon and are staggered with respect to the conveying direction (X-axis direction).
The elastic body of the present embodiment is a plate spring main body 27. The elastic body may be a coil spring, a compression coil spring, a disc spring, a conical coil plate spring, a ring spring, or the like.
The plate spring main body 27 shown in fig. 3 a and B includes a first flat portion 27A connected to the mount, and an inclined portion 27B inclined downward from an end of the first flat portion 27A in the axial direction (Y-axis direction). The first flat portion 27A of the plate spring main body 27 and the mount are fixed by welding or the like.
The plate spring main body 27 includes a second flat portion 27C extending from the lower end of the inclined portion 27B in the axial direction (Y-axis direction). This allows the plate spring main body 27 to move smoothly in the axial direction (Y-axis direction) on the support member 28 shown in fig. 1.
The plate spring main body 27 shown in fig. 3(a) includes 1 inclined portion 27B. Specifically, the inclined portion 27B is provided from one end of the first flat portion 27A toward one of the axial directions (Y-axis direction).
The plate spring main body 27 shown in fig. 3(B) includes 2 inclined portions 27B. Specifically, the inclined portion 27B is provided from one end of the first flat portion 27A toward one side in the axial direction (Y-axis direction), and the inclined portion 27B is provided from the other end of the first flat portion 27A toward the other side in the axial direction (Y-axis direction).
In the description of the present embodiment, the leaf spring main body shown in fig. 3(a) is referred to as a "one-leg leaf spring main body", and the leaf spring main body shown in fig. 3(B) is referred to as a "two-leg leaf spring main body".
The angle formed by the inclined portion 27B of the plate spring main body 27 and the axial direction (Y-axis direction) is preferably 5 to 45 degrees, and more preferably 10 to 30 degrees. When the angle is 5 degrees or more, a desired elastic restoring force can be obtained with respect to the vertical direction (Z-axis direction). If the angle is 45 degrees or less, the upper portion of the plate spring main body 27 can be cooled by the water pipe provided between the support member and the elastic support body.
The inclined portion 27B of the present embodiment is connected to the side end of the first flat portion 27A, but may be connected to the lower end of the first flat portion 27A. The inclined portion 27B of the present embodiment is linear in the cross section (YZ plane) from one end (the other end) of the first flat portion 27A toward one (the other) in the axial direction (the Y-axis direction), but may be arcuate, wavy, stepped, or the like.
The elastic support body 25 shown in fig. 2(a) to (C) includes a single-foot plate spring main body 27-1 and double-foot plate spring main bodies 27-1 in a row on the upstream side (X side) in the conveying direction (X axis direction). The single-leg leaf spring main body 27-1 is provided at the outer end positions of the removing member 23 on one side (+ Y side) and the other side (-Y side) in the axial direction (Y axis direction). This facilitates the accommodation of the elastic support 25 in the dross box. The elastic support body 25 includes a leaf spring main body 27-2 having two legs in a row on the downstream side (+ X side) in the conveying direction (X axis direction).
The first flat portion of the plate spring main body 27-1 is provided at a contact position where the removing members 23 contact each other in the axial direction (Y-axis direction). Further, the first flat portion of the plate spring main body 27-2 is provided at a position (e.g., a central position) between the adjacent contact positions in the axial direction (Y-axis direction). Thus, 1 removing member 23 is supported by 3 plate spring main bodies 27-1, 27-2(2 plate spring main bodies 27-1 and 1 plate spring main body 27-2). Here, the first flat portion of the plate spring main body 27-1 of both feet is longer than the axial direction (Y axis direction) length of the first flat portion of the plate spring main body 27-1 of one foot, and supports the end portions of the adjacent 2 removing members.
It is preferable that 1 removing member 23 is supported by 3 or more leaf spring bodies. Specifically, 4 or more supports can be realized by increasing the linear density of the plate spring main bodies 27-1, 27-2 per row by setting the rows to 3 or more or increasing the angle of the inclined portion of the plate spring main bodies 27-1, 27-2.
However, the row formed by the plurality of plate spring bodies 527 of the prior art elastic support body 525 shown in fig. 5 is 1 row. The first flat portion of the plate spring main body 527 is provided at a contact position where the removing members 23 contact each other in the axial direction (Y-axis direction). Thereby, 1 removing member 23 is supported by 2 plate spring bodies 527. Further, when the elastic support body 525 is used for a long period of time, the elastic support body is greatly affected by the decrease of the elastic restoring force, and the removing member may not sufficiently remove tin or tin oxide adhering to the lift roller.
In contrast, the 1 removal member 23 of the elastic support body 25 of the present embodiment is supported by the 3 plate spring main bodies 27-1, 27-2. Therefore, even if the device is used for a long time, the effect of the decrease in the elastic restoring force is small, and the removal member 23 can be brought into uniform contact with the lift roller to remove the scum defect without unevenness.
The mount 26 is a plate-like member, and has a rectangular shape in XY plan view. The axial direction (Y-axis direction) length of the mount 26 is preferably longer than the total length of the removing members 23 arranged in parallel on the mount 26. The length of the glass ribbon in the conveying direction (X-axis direction) is preferably longer than the length of the removing member 23.
The mount 26 of the present embodiment may be disposed below the plate spring main body 27. In this case, the second flat portions 27C of the adjacent leaf spring main bodies 27 may be connected to each other.
The removal member 23 has a rectangular parallelepiped shape. The removal member 23 may be a rectangular pillar having a trapezoidal or inverted trapezoidal cross section (YZ plane). The number of the removing members 23 shown in fig. 2(B) and (C) is 3, but may be 4 or more. For example, the removing members may be divided into two parts at the center of each removing member 23 in the axial direction (Y-axis direction), and the number of the removing members may be 6. In this case, 1 divided removing member is supported by 2 plate spring main bodies 27-1, 27-2(1 plate spring main body 27-1 and 1 plate spring main body 27-2). However, since the length of the removal member after division in the axial direction (Y-axis direction) is half the length of the removal member 23 before division, the influence of the decrease in the elastic restoring force of the elastic support body 25 is small even if the removal member is continuously used for a long period of time. The number of the removing members 23 is determined by the length of the body of the lift roller in the axial direction (Y-axis direction).
The removing member 23 is preferably a molded body of carbon (graphite). As the removing member 23, a molded body of boron nitride, alkali sulfate, alkaline earth sulfate, alkali carbonate, alkaline earth carbonate, silica-based fine particles, or alumina fine particles may be used.
The axial (Y-axis) length of the removing member 23 is preferably 250 to 1000mm, more preferably 350 to 800 mm. When the length is 250mm or more, the number of removing members 23 used for 1 lift roller can be reduced, and therefore, the replacement work of the removing members 23 becomes rapid. Further, if the length is 1000mm or less, the process of replacing the removing member 23 becomes easy.
The height of the removing member 23 is preferably 50 to 200mm, more preferably 70 to 150 mm. When the height is 50 to 200mm, the process of replacing the removing member 23 becomes easy.
The length of the removing member 23 in the glass ribbon conveying direction (X-axis direction) is preferably 20 to 100mm, and more preferably 30 to 80 mm. When the length is 20mm or more, the contact pressure with the lift roller can be increased. Further, if the length is 100mm or less, the process of replacing the removing member 23 becomes easy.
The carbon powder used for the molded body in the removing member 23 preferably has a maximum particle diameter of 0.1 to 3mm, more preferably 0.5 to 2.5 mm. When the maximum particle diameter is 0.1 to 3mm, the strength of the removing member 23 as a molded body can be secured.
The Shore hardness of the removing member 23 is preferably 20 to 90HS, more preferably 30 to 80 HS. When the shore hardness is 20 to 90HS, the abrasion resistance of the removing member 23 to the lift roller can be ensured.
(second embodiment)
Fig. 4 shows an elastic support body and a removing member according to a second embodiment of the present invention, (a) is a plan view showing a positional relationship between a plate spring main body and a mount, (B) is a sectional view of the plate spring main body and the mount and the removing member on the upstream side in the conveying direction, and (C) is a sectional view of the plate spring main body and the mount and the removing member on the downstream side in the conveying direction. The elastic support body and the removing member according to the second embodiment of the present invention will be described with reference to fig. 4(a) to (C). The description of the elastic support and the removing member overlapping with those of the first embodiment of the present invention is omitted.
The elastic support body 125 according to the second embodiment of the present invention is different from the elastic support body 25 according to the first embodiment in that the leaf spring bodies 127-1 and 127-2 are all constituted by one-leg leaf spring bodies.
As shown in fig. 4B, in the row on the upstream side (-X side) in the conveying direction (X axis direction), all the leaf spring main bodies 127-1 have an inclined portion extending from the first flat portion toward one side (+ Y side) in the axial direction (Y axis direction).
As shown in fig. 4C, in the row on the downstream side (+ X side) in the conveying direction (X axis direction), all the leaf spring main bodies 127-2 have inclined portions extending from the first flat portion toward the other side (-Y side) in the axial direction (Y axis direction).
In the present embodiment, the plate spring main body 127-1 and the inclined portion of the plate spring main body 127-2 face in opposite directions in the axial direction (Y-axis direction), and therefore the elastic restoring force acting on one side (+ Y side) generated by the plate spring main body 127-1 and the elastic restoring force acting on the other side (-Y side) generated by the plate spring main body 127-2 cancel each other out. This enables the removal member 23 to uniformly contact the lift roller. When the plurality of rows is 3 or more, for example, the leaf spring main bodies 127-1 are provided in the odd-numbered rows and the leaf spring main bodies 127-2 are provided in the even-numbered rows as counted from the upstream side (the (-X side) in the conveying direction (the X axis direction). Here, when the number of rows is odd, the length of the inclined portion, the angle formed by the inclined portion and the axial direction (Y-axis direction), the number of leaf spring bodies, the material of the leaf spring bodies, and the like are appropriately changed so that the elastic restoring force acting on one side (+ Y side) and the elastic restoring force acting on the other side (-Y side) cancel each other out. Further, the plate spring main bodies 127-1 may be provided in even-numbered rows and the plate spring main bodies 127-2 may be provided in odd-numbered rows as counted from the upstream side (the-X side) in the conveying direction (the X-axis direction).
The first flat portion of the plate spring main body 127-1 is provided at the end position of the other side (-Y side) of the removing member 23 and at a position slightly closer to the one side (+ Y side) than the center position of the removing member 23 in the axial direction (Y axis direction). The first flat portion of the plate spring main body 127-2 is provided at one end position (+ Y side) of the removing member 23 and at a position slightly closer to the other end position (-Y side) than the center position of the removing member 23 in the axial direction (Y axis direction). Thus, 1 removing member 23 is supported by 4 leaf spring main bodies 127-1, 127-2(2 leaf spring main bodies 127-1 and 2 leaf spring main bodies 127-2). Therefore, the elastic support body 125 of the present embodiment has a small influence of the decrease in the elastic restoring force even if it is used for a long period of time, and can remove the scum defect without unevenness by making the removing member 23 uniformly contact the lift roller. The removing member 23 may be supported by 5 or more leaf spring main bodies 127-1 and 127-2.
Here, the elastic support bodies 125 are all formed of a single-leg plate spring body, and since the inclined portions of the plate spring body are oriented in the same direction in the axial direction (Y-axis direction), the plate spring bodies 127-1 and 127-2 can be arranged closer to each other than the elastic support bodies 25. This can increase the number of leaf spring bodies supporting the removing member 23, and thus the removing member 23 can be more uniformly brought into contact with the lift roller.
In the present embodiment, the plate spring main body 127-1 and the plate spring main body 127-2 are arranged with a slight shift with respect to the conveying direction (X-axis direction), but the plate spring main body 127-2 may be arranged at a central position between the adjacent plate spring main bodies 127-1 in the axial direction (Y-axis direction), for example. This configuration is excellent in that a more uniform elastic restoring force can be applied to the removing member 23.
[ method for producing float glass ]
Next, a float glass production method according to an embodiment of the present invention will be described.
In the float glass manufacturing method, molten glass is continuously supplied onto molten metal in a molten metal bath, a glass ribbon is formed on the molten metal, the glass ribbon is drawn out from the molten metal bath by lift rollers provided in a dross box, and the glass ribbon is gradually cooled to a temperature lower than the strain point of the glass while being conveyed by annealing rollers provided in a slow cooling furnace.
In the scum box, a removing member is elastically contacted with the lifting roller by using an elastic support body, and scum defects attached to the lifting roller are removed.
The elastic support body includes a plurality of elastic bodies provided at intervals in the axial direction of the lift roller, and a mount disposed on the elastic bodies.
The plurality of elastic bodies are arranged in a plurality of rows along the conveying direction of the glass ribbon and are offset with respect to the conveying direction.
The gradually cooled plate glass is cut into a desired size by a cutting device to obtain a glass plate.
The float glass manufacturing method further includes a polishing step of polishing the glass plate in order to optimize the flatness of the glass plate when manufacturing the glass substrate for the liquid crystal display.
The float glass produced in the present embodiment may be soda lime glass for window glass/vehicle use, but is preferably glass containing an alkali metal component such as glass for chemical strengthening suitable for cover glass use, or alkali-free glass containing substantially no alkali metal component. Here, the term "substantially not containing an alkali metal component" means that the total content of alkali metal oxides is 0.1 mass% or less. The alkali-free glass is mainly used for glass substrates for liquid crystal displays. Glass sheets for cover glass and glass substrates for liquid crystal displays have strict requirements for quality of scum defects.
The glass for chemical strengthening contains, for example, 62 to 68% of SiO in terms of mol% based on oxides26 to 12% of Al2O37-13% of MgO and 9-17% of Na2O, 0 to 7% of K2O, from Na2O and K2Sum of O content minus Al2O3Content to obtain a difference of less than 10% in the presence of ZrO2In the case of (2), the content thereof is 0.8% or less.
The other glass for chemical strengthening contains 65 to 85% of SiO in terms of mol% based on oxides23-15% of Al2O35 to 15% of Na2O, 0 to less than 2% of K2O, 0 to 15% of MgO, and 0 to 1% of ZrO2，SiO2And Al2O3Total of contents of (A) SiO2+Al2O3Is 88% or less.
The other glass for chemical strengthening contains 50 to 75% of SiO in terms of mol% based on oxides29 to 20% of Al2O310 to 20% of Na2O, 0-6% of K2O, 0 to 15% MgO, CaO, SrO and BaO in a total amount (CaO + SrO + BaO) of 0 to 10%, and ZrO2+TiO2) ZrO in an amount of 0 to 5%2And TiO2、0～10％B of (A)2O30 to 20% of Li2O。
The alkali-free glass contains 50-73% of SiO in terms of mass% based on oxides210.5 to 24% of Al2O30 to 12% of B2O30 to 10% of MgO, 0 to 14.5% of CaO, 0 to 24% of SrO, 0 to 13.5% of BaO, 8 to 29.5% of MgO + CaO + SrO + BaO, and 0 to 5% of ZrO2。
When the alkali-free glass achieves both a high strain point and a high melting property, it is preferable that the alkali-free glass contains 58 to 66% of SiO in terms of mass% based on oxides215 to 22% of Al2O35 to 12% of B2O30-8% of MgO, 0-9% of CaO, 3-12.5% of SrO, 0-2% of BaO, and 9-18% of MgO + CaO + SrO + BaO.
The alkali-free glass preferably contains 54 to 73% of SiO in terms of mass% based on oxides, particularly when a high strain point is to be obtained210.5 to 22.5% of Al2O30 to 5.5% of B2O30-10% of MgO, 0-9% of CaO, 0-16% of SrO, 0-2.5% of BaO, and 8-26% of MgO + CaO + SrO + BaO.
The float glass produced in the present embodiment has a thickness of 0.1 to 2.0mm for a cover glass and 0.1 to 0.7mm for a glass substrate for a liquid crystal display.
While the present invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof.
The present application is based on japanese patent application 2018-115232, filed on 6/18/2018, the contents of which are incorporated herein by reference.
[ INDUSTRIAL APPLICABILITY ]
The float glass produced may be used for various purposes such as architectural use, vehicle use, flat panel display use, cover glass use, and others.
Claims (9)
1. A float glass manufacturing apparatus comprising a float bath for forming a glass ribbon on molten metal, a dross box adjacent to the float bath, and a slow cooling furnace adjacent to the dross box, the float glass manufacturing apparatus being characterized in that,
the scum box is provided with a lifting roller for lifting the glass ribbon, a removing member for abutting against the lifting roller, and an elastic support body for supporting the removing member,
the elastic support body includes a plurality of elastic bodies provided at intervals in the axial direction of the lift roller, and a mount disposed on the elastic bodies,
the plurality of elastic bodies are formed in a plurality of rows along a conveying direction of the glass ribbon, and the plurality of elastic bodies are arranged in a staggered manner in the conveying direction.
2. The float glass manufacturing apparatus of claim 1, wherein,
the elastic body is a plate spring main body,
the plate spring main body is provided with: a first flat part connected to the stand; and an inclined portion that gradually inclines downward from an end of the first flat portion toward the axial direction.
3. The float glass manufacturing apparatus of claim 2, wherein,
at least one of the plate spring main bodies includes:
an inclined portion inclined from one end of the first flat portion toward one side in the axial direction; and
and an inclined portion inclined from the other end portion of the first flat portion toward the other end portion in the axial direction.
4. The float glass manufacturing apparatus according to claim 2 or 3, wherein,
the plate spring main body includes, in odd-numbered rows from an upstream side in the conveying direction among the plurality of rows, an inclined portion inclined from the first flat portion toward one side in the axial direction,
the plate spring main body includes, in even-numbered rows from an upstream side in the conveying direction among the plurality of rows, an inclined portion inclined from the first flat portion toward the other side in the axial direction.
5. The float glass manufacturing apparatus according to claim 2 or 3, wherein,
the plate spring main body includes an inclined portion inclined from the first flat portion toward one of the axial directions in an even number of rows from an upstream side in the conveying direction among the plurality of rows,
the plate spring main body includes, in odd-numbered rows from an upstream side in the conveying direction, inclined portions inclined from the first flat portion toward the other side in the axial direction.
6. The float glass manufacturing apparatus according to claim 2 or 3, wherein,
the plate spring main body includes a second flat portion extending from a lower end of the inclined portion toward the axial direction.
7. The float glass manufacturing apparatus according to claim 2 or 3, wherein,
the removing member is supported by three or more of the leaf spring main bodies.
8. The float glass manufacturing apparatus according to claim 2 or 3, wherein,
the removing member is provided in plurality in the axial direction,
the first flat portion is provided at a position between a contact position where the removing members are in contact with each other and the adjacent contact position in the axial direction.
9. A float glass production method comprising continuously supplying molten glass onto molten metal in a molten metal bath, forming a glass ribbon on the molten metal, pulling out the glass ribbon from the molten metal bath by lift-up rolls provided in a float bath, and carrying and gradually cooling the glass ribbon by annealing rolls provided in a slow cooling furnace, characterized in that,
in the scum box, an elastic support body is used to make a removing component elastically abut against the lifting roller,
the elastic support body includes a plurality of elastic bodies provided at intervals in the axial direction of the lift roller, and a mount disposed on the elastic bodies,
the plurality of elastic bodies are formed in a plurality of rows along a conveying direction of the glass ribbon, and the plurality of elastic bodies are arranged in a staggered manner in the conveying direction.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018115232A JP2019218222A (en) | 2018-06-18 | 2018-06-18 | Apparatus and method for manufacturing float glass |
| JP2018-115232 | 2018-06-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110615601A true CN110615601A (en) | 2019-12-27 |
Family
ID=68921239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910514736.3A Pending CN110615601A (en) | 2018-06-18 | 2019-06-14 | Float glass manufacturing device and float glass manufacturing method |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2019218222A (en) |
| KR (1) | KR20190142728A (en) |
| CN (1) | CN110615601A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009046366A (en) * | 2007-08-22 | 2009-03-05 | Asahi Glass Co Ltd | Apparatus and method for manufacturing glass plate |
| CN101553439A (en) * | 2006-12-08 | 2009-10-07 | 旭硝子株式会社 | Process for producing glass sheet |
| JP2011132099A (en) * | 2009-12-25 | 2011-07-07 | Nippon Electric Glass Co Ltd | Method and apparatus for manufacturing glass plate |
| JP2011157250A (en) * | 2010-02-03 | 2011-08-18 | Asahi Glass Co Ltd | Stuck material removing member for float glass conveying roller |
| CN103906715A (en) * | 2011-10-28 | 2014-07-02 | 旭硝子株式会社 | Method for cleaning rear roll, and glass plate production device |
| CN105143124A (en) * | 2013-04-26 | 2015-12-09 | 旭硝子株式会社 | Glass sheet production device and glass sheet production method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11335127A (en) | 1998-05-26 | 1999-12-07 | Central Glass Co Ltd | Removing member for tin adhered to float glass carriage roll |
-
2018
- 2018-06-18 JP JP2018115232A patent/JP2019218222A/en active Pending
-
2019
- 2019-06-14 CN CN201910514736.3A patent/CN110615601A/en active Pending
- 2019-06-14 KR KR1020190070509A patent/KR20190142728A/en unknown
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101553439A (en) * | 2006-12-08 | 2009-10-07 | 旭硝子株式会社 | Process for producing glass sheet |
| JP2009046366A (en) * | 2007-08-22 | 2009-03-05 | Asahi Glass Co Ltd | Apparatus and method for manufacturing glass plate |
| JP2011132099A (en) * | 2009-12-25 | 2011-07-07 | Nippon Electric Glass Co Ltd | Method and apparatus for manufacturing glass plate |
| JP2011157250A (en) * | 2010-02-03 | 2011-08-18 | Asahi Glass Co Ltd | Stuck material removing member for float glass conveying roller |
| CN103906715A (en) * | 2011-10-28 | 2014-07-02 | 旭硝子株式会社 | Method for cleaning rear roll, and glass plate production device |
| CN105143124A (en) * | 2013-04-26 | 2015-12-09 | 旭硝子株式会社 | Glass sheet production device and glass sheet production method |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20190142728A (en) | 2019-12-27 |
| JP2019218222A (en) | 2019-12-26 |
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