CN106082627B - Backup roll and method for manufacturing glass plate - Google Patents
Backup roll and method for manufacturing glass plate Download PDFInfo
- Publication number
- CN106082627B CN106082627B CN201610273691.1A CN201610273691A CN106082627B CN 106082627 B CN106082627 B CN 106082627B CN 201610273691 A CN201610273691 A CN 201610273691A CN 106082627 B CN106082627 B CN 106082627B
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- glass
- support
- heater
- roller
- glass ribbon
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- 239000011521 glass Substances 0.000 title claims abstract description 151
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000010583 slow cooling Methods 0.000 claims description 36
- 229910052751 metal Inorganic materials 0.000 claims description 35
- 239000002184 metal Substances 0.000 claims description 35
- 230000007246 mechanism Effects 0.000 claims description 22
- 238000009826 distribution Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000005329 float glass Substances 0.000 description 22
- 238000010521 absorption reaction Methods 0.000 description 11
- 239000007789 gas Substances 0.000 description 11
- 238000007789 sealing Methods 0.000 description 10
- 238000000465 moulding Methods 0.000 description 6
- 238000011144 upstream manufacturing Methods 0.000 description 6
- 239000011449 brick Substances 0.000 description 5
- 238000006124 Pilkington process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000005357 flat glass Substances 0.000 description 4
- 239000012212 insulator Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 3
- 238000000137 annealing Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000006060 molten glass Substances 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001128 Sn alloy Inorganic materials 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000006059 cover glass Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
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- 230000008569 process Effects 0.000 description 1
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B18/00—Shaping glass in contact with the surface of a liquid
- C03B18/02—Forming sheets
- C03B18/04—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
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B25/00—Annealing glass products
- C03B25/04—Annealing glass products in a continuous way
- C03B25/06—Annealing glass products in a continuous way with horizontal displacement of the glass products
- C03B25/08—Annealing glass products in a continuous way with horizontal displacement of the glass products of glass sheets
-
- 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
- C03B35/18—Construction of the conveyor rollers ; Materials, coatings or coverings thereof
-
- 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
- C03B35/18—Construction of the conveyor rollers ; Materials, coatings or coverings thereof
- C03B35/183—Construction of the conveyor rollers ; Materials, coatings or coverings thereof specially adapted for thermal adjustment of the rollers, e.g. insulating, heating, cooling thereof
Abstract
The invention provides a support roller which can maintain the current space and can add a heat source for preventing heat removal, and a method for manufacturing a glass plate. A support roller for supporting a high-temperature medium to be supported conveyed in a chamber, the support roller comprising a hollow support body for supporting the medium to be supported and a hollow rotary shaft connected to at least one end of the support body, wherein a heater is mounted in the hollow of the support body, and the heater rotates together with the support body and the rotary shaft.
Description
Technical Field
The present invention relates to a backup roller and a method for manufacturing a glass plate.
Background
As one of typical methods for producing sheet glass, a float process is known. A glass manufacturing apparatus based on the float process includes a forming device for forming a glass ribbon in a shape of a ribbon plate on a molten metal in a bath, and a slow cooling device for slowly cooling the glass ribbon (see, for example, patent document 1).
That is, molten glass is continuously supplied to a bath surface of molten metal (e.g., molten tin) in the bath to form a glass ribbon in a band plate shape. After being lifted from the bath surface, the glass ribbon is drawn out from the outlet of the bath and conveyed by lift rollers, which are an example of support rollers disposed in an interface device connecting the forming device and the slow cooling device. Next, the glass ribbon is slowly cooled while being conveyed by slow cooling rollers disposed in the slow cooling device.
The glass ribbon has a flat portion between both side edge portions. Both side edge portions of the glass ribbon are thicker than the flat portions of the glass ribbon and are cut off after slow cooling. Thus, float glass having a substantially uniform thickness can be obtained.
[ Prior Art document ]
[ patent document ]
[ patent document 1 ] Japanese patent application laid-open No. 6-227831
[ problem to be solved by the invention ]
In a float-based glass manufacturing apparatus, the molten metal accumulates heat, so the glass ribbon is difficult to cool during contact with the molten metal, but is easily cooled (de-heated) when separated from the molten metal. The flat portions of the glass ribbon are thinner than the two side edge portions of the glass ribbon and therefore are easier to cool. Therefore, temperature unevenness occurs in the width direction of the glass ribbon, and defects such as deformation and cracks may occur in the sheet glass.
Thin plate glass used in television sets, smart phones, and the like in recent years is manufactured. When such a thin glass sheet is produced, the thickness of the glass ribbon is thinner than that of a conventional glass sheet for buildings and the like. Therefore, when the thin glass ribbon is separated from the molten metal in the interface device, the sensible heat taken out of the glass ribbon is small, so that temperature unevenness due to heat removal is more likely to occur, and if the surface of the thin glass sheet becomes defective and becomes conspicuous, the quality may be degraded.
In order to prevent the temperature unevenness due to the heat release, it is conceivable to further dispose a heat source in the interface device in order to prevent the heat release of the glass ribbon.
However, in the interface device, a large number of components such as lift rollers (support rollers), heaters, and curtains have been densely arranged, and it is difficult to secure a space for adding a heat source.
Therefore, it is required to add a heat source for preventing heat removal while maintaining the current space in the apparatus.
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 support roller that can maintain a current space and can add a heat source for preventing heat removal.
[ MEANS FOR solving PROBLEMS ] A method for solving the problems
In order to solve the above problem, according to an aspect of the present invention, there is provided a support roller for supporting a high-temperature supported medium conveyed in a chamber, the support roller including:
a hollow support main body portion for supporting the supported medium; and
a hollow rotary shaft connected to at least one end of the support body,
a heater is mounted in the hollow portion of the support main body portion, and the heater rotates together with the support main body portion and the rotation shaft portion.
[ Effect of the invention ]
According to the present invention, it is possible to provide a support roller that can maintain a current space and can add a heat source for preventing heat removal.
Drawings
Fig. 1 is a view showing a float glass manufacturing apparatus on which a backup roller according to a first embodiment of the present invention is mounted.
Fig. 2 is a view showing the overall structure of a support roller according to a first embodiment of the present invention.
Fig. 3 is a partially enlarged view of fig. 2.
Fig. 4 is a view showing the entire structure of a support roller according to a second embodiment of the present invention.
[ Mark Specification ]
10 forming device
11 bath (Metal flume)
11a downstream end portion
12 metal shell
13 brick layer
20 slow cooling device
21 slow cooling furnace
30 interface device (Chamber)
31 scum box
32 sealing door
33 lifting roll (supporting roll)
340 support body portion
350 rotating shaft part
360 heater
361 heating part
362 axle part
363 flange part
38-1 ~ 38-8 interface heater
50 slip ring
60 thermal expansion absorbing mechanism
61 barrel part
62 flange part
70 electric power control device (electric power control unit)
G glass ribbon
M molten metal
H. I, J, K hollow part
Detailed Description
Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the drawings, the same or corresponding components are denoted by the same or corresponding reference numerals, and description thereof is omitted. In the following description, "to" indicating a numerical range means a range including the numerical values before and after it. The glass production apparatus of the present invention can be applied to a production method such as a float process or a melting process, and the float process will be described as an example below. Therefore, the glass manufacturing apparatus is hereinafter referred to as a float glass manufacturing apparatus.
Further, the backup roll according to the first embodiment of the present invention is applied to the lift roll disposed in the interface device of the float glass manufacturing apparatus, but the present invention is not limited thereto, and can be applied to all backup rolls that support a high-temperature supported medium. The support roller may not always contact the glass, or may contact the glass when the flow of the glass is disturbed. Examples of the glass to be supported include a glass ribbon having a flat portion and both side edge portions thicker than the flat portion, and a glass sheet obtained by cutting out both side edge portions of the glass ribbon. As a modification of the function of supporting the glass, the support roller may have at least 1 function of a function of forming the glass into a desired shape, a function of assisting conveyance of the glass, and a function of regulating the position of the glass in a direction perpendicular to the conveyance direction. Here, the direction perpendicular to the glass conveying direction may be either a front-back direction perpendicular to the main surface of the glass or a side surface direction parallel to the main surface of the glass.
Hereinafter, the backup roller is referred to as a lift roller. The medium to be supported by the support rollers is denoted as a glass ribbon G. In the present embodiment, the term "inside the chamber" as defined in the claims means "inside the interface device".
< float glass production apparatus >
Fig. 1 is a view showing a float glass manufacturing apparatus on which a backup roller according to a first embodiment of the present invention is mounted. The float glass manufacturing apparatus includes a forming apparatus 10, a slow cooling apparatus 20, and an interface apparatus (corresponding to a chamber) 30.
The forming apparatus 10 forms a glass ribbon G having a plate shape on a molten metal M in a bath 11 (a molten metal bath). The glass ribbon G gradually hardens while flowing over the molten metal M. The glass ribbon G is lifted from the molten metal M in the downstream area of the bath 11 and conveyed toward the slow cooling device 20. The molding device 10 includes a bath 11, a ceiling 15, a bath heater 16, a pipe 17, and the like.
The bath 11 contains molten metal M. The molten metal M may be any general material, and may be, for example, molten tin or a molten tin alloy. The bath 11 is composed of, for example, a metal casing 12 and a brick layer 13.
The metal case 12 suppresses the mixing of the outside air into the bath 11. The metal case 12 is formed by welding a plurality of metal plates, for example.
The brick layer 13 covers the inner surface of the metal shell 12. The brick layer 13 may be an assembly in which a plurality of bricks are assembled into a box shape, and the molten metal M is contained therein.
The ceiling 15 is provided above the bath tub 11, and covers the space above the bath tub 11. A reducing gas or the like is supplied to the space above the bath 11 from the through-hole 15a of the ceiling 15 to prevent oxidation of the molten metal M. As the reducing gas, for example, a mixed gas of nitrogen and hydrogen can be used. The space above the bath tub 11 is set to a positive pressure higher than the atmospheric pressure to prevent the mixing of the outside air.
The bathroom heater 16 is inserted through the through hole 15a of the ceiling 15, protrudes downward from the ceiling 15, and heats the glass ribbon G and the like. The bathroom heater 16 may be of a general structure, and may be, for example, a SiC heater.
The plurality of bath heaters 16 are provided at intervals in the width direction of the glass ribbon G (the direction perpendicular to the paper surface in fig. 1) and in the flow direction of the glass ribbon G (the direction of arrows X1-X2 in fig. 1).
The pipe 17 forms a gas flow at the outlet of the molding device 10 by injecting an inert gas such as nitrogen gas, and can suppress the outflow of the reducing gas. Instead of the pipe 17, a partition plate may be provided. The partition plate is disposed above the glass ribbon G to form a minute gap with the glass ribbon G.
The slow cooling device 20 slowly cools the glass ribbon G. The slow cooling device 20 includes a slow cooling furnace 21, a conveying roller 22 (hereinafter, also referred to as a slow cooling roller 22), and the like. The lehr roller 22 is rotatable about its center line, is driven by a motor or the like to rotate, and horizontally conveys (supports) the glass ribbon G in the lehr 21. The glass ribbon G is slowly cooled while being conveyed. The glass ribbon G has a flat portion between both side edge portions. The glass ribbon G is cut after slow cooling because both side edge portions are thicker than the flat portions of the glass ribbon G. Thereby, float glass having a substantially uniform thickness is obtained.
The interface device 30 connects the forming apparatus 10 and the slow cooling apparatus 20 to restrict a temperature decrease of the glass ribbon G separated from the molten metal M. The molten metal M is hard to cool during contact with the molten metal M due to the accumulated heat, but is easy to cool (remove heat) when detached from the molten metal M.
The interface device 30 comprises a scum box 31, a sealing door 32, a lifting roller 33, a curtain 34, a sealing block 35 and interface heaters 38-1 to 38-8. Here, although the form of the interface heaters 38-1 to 38-8 is described as an example, the arrangement of the heaters is not limited thereto, and the number and arrangement thereof may be changed as appropriate, including the following description.
The dross box 31 is provided below the glass ribbon G and removes oxides (referred to as dross) of the molten metal M adhering to the bottom surface of the glass ribbon G. The inner surface of the dross box 31 is covered with the heat insulator 41, and heat dissipation from the dross box 31 to the outside is restricted.
The dross box 31 may connect the downstream end portion 11a of the bath 11 with the upstream end portion of the slow cooling furnace 21. In the case where a slight gap is formed between the dross box 31 and the upstream end of the slow cooling furnace 21, the gap may be filled with a heat insulator.
The sealing door 32 is disposed above the glass ribbon G. The upper surface of the sealing door 32 is covered with the heat insulator 42, and heat dissipation from the sealing door 32 to the outside is restricted.
The sealing door 32 may connect a downstream end portion of the ceiling 15 to an upstream end portion of the slow cooling furnace 21. In the case where a slight gap is formed between the sealing door 32 and the upstream end of the slow cooling furnace 21, the gap may be filled with a heat insulator.
The lift-up roller 33 lifts up the glass ribbon G from the molten metal M and conveys (supports) the glass ribbon G toward the annealing device 20. The lift roller 33 is rotatable about its center line, and is driven by a motor or the like to rotate. The support roller of the present embodiment is applied to the lift roller 33 described above.
In a straightforward manner, the present invention is characterized by a heater being mounted in the lift roller 33. The structure for mounting the heater will be described later.
The plurality of curtains 34 are hung at intervals in the flow direction of the glass ribbon G of the sealing door 32 (the direction of arrow X1-X2 in fig. 1), and block the flow of gas above the glass ribbon G. This can suppress the mixing of the reducing gas into the molding apparatus 10, and can suppress the temperature fluctuation caused by the combustion of the reducing gas. The shade 34 is disposed above the lift roller 33.
The seal block 35 blocks the flow of the gas under the glass ribbon G by contacting the lift roller 33, and scrapes off the dross attached to the lift roller 33. The sealing block 35 is formed of carbon, for example.
Each interface heater 38-1 to 38-8 heats the glass ribbon G. The plurality of interface heaters 38-1-38-8 can be independently controlled.
Each of the interface heaters 38-1 to 38-8 can be divided into a plurality of heating elements along the width direction of the glass ribbon G to adjust the temperature distribution in the width direction of the glass ribbon G. The plurality of divided heating elements can be independently controlled.
At least 1 (2 interface heaters 38-1 and 38-2 in the present embodiment) of the plurality of interface heaters 38-1 to 38-8 may be provided upstream (in the direction of arrow X1 in fig. 1) of the center line of the uppermost lift roller 33.
Thus, the temperature of the flat portion of the glass ribbon G between the disengagement position P1 and the contact position P2 is more gradually reduced. This can further reduce deformation of the glass ribbon G due to temperature unevenness, and can also suppress the occurrence of fine deformation such as wrinkles, undulations, and warps.
Interface heater 38-1 is disposed below glass ribbon G. Interface heater 38-2 is disposed above glass ribbon G.
At least 1 (2 interface heaters 38-7, 38-8 in the present embodiment) of the plurality of interface heaters 38-1 to 38-8 may be provided downstream (in the direction of arrow X2 in fig. 1) of the center line of the most downstream lift roller 33 (on the side of arrow X2). Interface heater 38-7 is disposed below glass ribbon G and interface heater 38-8 is disposed above glass ribbon G.
This can restrict a rapid temperature decrease of the glass ribbon G in the vicinity of the entrance of the annealing furnace 21, and can further suppress the occurrence of fine deformation.
< Lift roller (backup roller) >
Next, the support roller according to the present embodiment will be specifically described with reference to fig. 2 and 3.
Here, the lift roller 33 used for conveying (supporting) the glass ribbon G of the interface device 30 is described as an example of the support roller, but the present invention is not limited thereto.
The support roller in the present embodiment is a structure that supports glass conveyed in a predetermined direction by coming into contact with the glass. The support roller may not always contact the glass, or may contact the glass when the flow of the glass is disturbed. Examples of the glass include a glass ribbon having a flat portion and both side edge portions thicker than the flat portion, and a glass sheet obtained by cutting out both side edge portions of the glass ribbon. The support roller according to the present embodiment can be applied to all support rollers that support a high-temperature support target medium, as described above.
The support roller according to the present embodiment may have at least 1 function among a function of forming glass into a desired shape, a function of assisting conveyance of glass, and a function of regulating a position of glass in a direction perpendicular to a conveyance direction. Here, the glass conveying direction may be a horizontal direction, a vertical direction, or an oblique direction. The direction perpendicular to the glass conveyance direction may be either a direction perpendicular to the main surface of the glass or a direction parallel to the main surface of the glass (side surface direction).
Fig. 2 is a diagram schematically showing the overall configuration of the lift roller 33 constituting the interface device 30. Fig. 2 is a front view of the interface device 30 shown in fig. 1, as viewed in the direction of arrow X2.
The lift roller 33 (support roller) has a hollow support main body 340 for supporting the glass ribbon G, and a rotation shaft 350 connected to an end of the support main body 340.
The rotation shaft 350 is connected to both ends of the support body 340, but may be configured such that a hollow rotation shaft is disposed only at one end. Specifically, the rotation shaft 350 includes a hollow rotation shaft 350R connected to the right end of the support main body 340 and a solid rotation shaft 350L connected to the left end of the support main body 340. The "rotation shaft" described in the claims herein refers to the hollow rotation shaft 350R disposed on the right side R. The rotation shaft 350R has a hollow structure, and can accommodate a thermal expansion absorption mechanism 60 described later and allow the electric power supply line W to be inserted therethrough. Further, since the rotation shaft 350R has a hollow structure, even if the pressure of the gas contained in the hollow portion H described later rises due to the temperature rise, the gas can escape into the hollow portion I described later to reduce the pressure. As shown in fig. 2, the rotation shaft 350R may have a hollow structure over the entire region, or may have a hollow structure only in a portion that houses the thermal expansion absorbing mechanism 60.
A drive control device (not shown) is connected to an end of the rotating shaft 350L, and the rotating shaft 350 (rotating shafts 350R and 350L) and the support body 340 can be driven to rotate by the drive control device, so that the glass ribbon G is fed in a predetermined direction and conveyed. The drive control device includes a speed reduction mechanism such as a gear, a pulley, and a timing belt, a drive device such as a motor, and the like. In the present embodiment, the drive control device is configured on the assumption that it is located on the left side L.
The outer diameter of the support main body 340 of the lift roller 33 of the present embodiment is 500mm or less, preferably 450mm or less, and more preferably 400mm or less. The length of the support main body 340 is 1000mm or more, preferably 4000mm or more, and more preferably 5000mm or more. The ratio of the outer diameter to the length (outer diameter/length) is 20% or less, preferably 15% or less, and more preferably 8% or less.
The heater 360 is provided in the hollow portion H of the support main body 340. The heater 360 includes a cylindrical heat generating portion 361 in which a heat generating body is arranged, and a shaft portion 362 having a hollow structure which passes through the center of the heat generating portion 361 and is formed longer than the heat generating portion 361. Therefore, the shaft 362 is in a form in which both ends thereof protrude (are exposed) from the heat generating portion 361. The shaft portion exposed to the left side L is denoted as a shaft portion 362L, and the shaft portion exposed to the right side R is denoted as a shaft portion 362R. A hollow portion formed integrally with the shaft portion 362 is denoted by J.
A flange 363L is provided at an end of the left shaft portion 362L. The flange 363L is coupled to the rotation shaft 350L. A connection portion between the flange portion 363L and the rotation shaft portion 350L is referred to as a support point FL. A flange 363R is provided at an end of the right shaft portion 362R. The flange 363R is coupled to a thermal expansion absorption mechanism 60 described later. The connection point between the flange 363R and the thermal expansion absorption mechanism 60 is referred to as a support point FR. The thermal expansion absorption mechanism 60 of the present embodiment is formed at a support point FR that supports the right side of the heater 360. However, the flange 363R of the support point FR may be formed so as to be coupled to the rotation shaft 350R without being coupled to the thermal expansion absorption mechanism 60.
As described above, the heater 360 of the present embodiment is supported by the support main body 340 at the two support points FR and FL, and rotates together with the support main body 340 and the rotation shaft 350. A space between the inner circumferential surface of the support main body 340 and the outer circumferential surface of the heat generating portion 361 of the heater 360 may be filled with a heat transfer unit or the like in the hollow portion H of the support main body 340.
In the illustrated example, a wire W (see fig. 3) connected to the heat generating portion 361 is inserted into the hollow portion J of the shaft portion 362R on the right side R, and the wire W inserted into the shaft portion 362 is housed in the slip ring 50 provided in the rotation shaft portion 350R. Therefore, even if the shaft portion 362 and the rotating shaft portion 350 rotate and the heater 360 rotates together with the support main body portion 340, the electric wires are not wound.
The heater 360 of the present embodiment rotates together with the support body 340 and the rotation shaft 350. The heater 360 has a length in the longitudinal direction of 4m or more, and may be bent in the longitudinal direction, but by having a structure that rotates together with the support main body 340 and the rotation shaft 350, it is possible to prevent the occurrence of bending.
The hollow portion H of the support body 340 and the hollow portion I of the rotation shaft 350 having the above-described configuration are provided with a thermal expansion absorbing mechanism 60 that absorbs thermal expansion of the heater 360. This is suitable for the case where the thermal expansion rates of the support main body portion 340 and the heater 360 (heat generating portion 361) are different.
The thermal expansion absorbing mechanism 60 provided at the support point FR on the right side R will be described below specifically with reference to fig. 3. Fig. 3 is a partially enlarged sectional view of the support point FR of fig. 2.
The thermal expansion absorption mechanism 60 is connected to the flange portion 363R of the heater 360. The thermal expansion absorption mechanism 60 includes a cylindrical portion 61 and a flange portion 62 connected perpendicularly to one end (left side L) of the cylindrical portion 61. The cylindrical portion 61 and the flange portion 62 have a common through hole 63 at their central portions to form a hollow portion K. The flange portion 62 and a flange portion 363R provided at an end of the shaft portion 362R are coupled to each other by bolt engagement or the like. At this time, the hollow portion J of the shaft portion 362R and the hollow portion K of the thermal expansion absorption mechanism 60 are coupled so as to match each other, and the hollow portions J, K, I are coupled in series. Therefore, the wire W can be smoothly inserted into the hollow portion J, K, I.
The cylindrical portion 61 of the thermal expansion absorption mechanism 60 is accommodated in the hollow portion I of the rotation shaft portion 350R in an unfixed state. Therefore, the hollow portion I of the rotation shaft portion 350R has an outer diameter capable of slidably wrapping the outer periphery of the cylinder portion 61.
Since the heater 360 of the present embodiment is coupled to the rotating shaft section 350R via the thermal expansion absorption mechanism 60, when the heat generating section 361 thermally expands, the cylindrical section 61 slides in the direction of the arrow (right side R in the drawing) in the hollow section I of the rotating shaft section 350R. This can effectively absorb thermal expansion of the heater 360.
In the present embodiment, the thermal expansion absorption mechanism 60 is shown as an example of the support point FR provided on the right side, but is not limited to this. It may be provided only at the support point FL, or may be provided at both sides (support points FR and FL). And may be provided in the central portion.
The heater 360 is a structure in which a temperature distribution is formed in the width direction. Specifically, as shown in fig. 2, the central region C, the right region S1, and the left region S2 are formed in the heat generating portion 361 of the heater 360, and the pitch of the heat generating elements mounted in each region is adjusted to form a temperature distribution. That is, the arrangement density of the heating elements mounted in each region is changed to form a temperature distribution. This is suitable for the case where the temperature adjustment is performed to avoid temperature unevenness in the width direction of the glass ribbon G when the glass ribbon G is supported and conveyed by the support main body 340 of the lift roller 33. For example, the pitch of the heat generating elements mounted in the right region S1 and the left region S2 may be set smaller or larger than the center region C. This can minimize temperature unevenness in the width direction of the glass ribbon G, and contributes to the production of high-quality glass sheets.
As described above, the support roller according to the present embodiment is configured such that the heater is provided in the support main body portion having a hollow structure for supporting the medium to be supported. In the present embodiment, the present invention is applied to a lift roller for supporting a glass ribbon G disposed in an interface device, particularly in a float glass manufacturing apparatus. Conventionally, in an interface device, when a thin glass ribbon is separated from a molten metal, sensible heat taken out of the glass ribbon is small, and therefore temperature unevenness due to heat removal is likely to occur, and a defect may occur in the thin glass sheet. However, since the heat source is mounted in the lift roller as described above, the heat release of the glass ribbon can be effectively prevented.
Further, since a large number of components such as heaters and curtains are already densely arranged in the interface device, a physical space for adding a heat source is limited. The support roller of the present invention has an advantage that a heat source for preventing heat release can be added without increasing the space required for the existing lift roller because the heat source is mounted in the support roller.
The support roller of the present embodiment is configured to change the arrangement density of the heating elements in the width direction to form a temperature distribution. This can minimize temperature unevenness in the width direction of the glass ribbon G, and contribute to the production of high-quality glass sheets.
< method for producing float glass >
Next, referring again to fig. 1, a method for manufacturing float glass using the float glass manufacturing apparatus having the above-described configuration will be described.
A float glass production method comprises: a forming step of continuously supplying molten glass to a bath surface of molten metal M (e.g., molten tin) to form a glass ribbon G having a plate shape; a lifting step of lifting the glass ribbon G from the bath surface by using a lifting roller and conveying the glass ribbon G to the slow cooling step; and a slow cooling step of slowly cooling the glass in a slow cooling furnace 21.
In the lifting step, the glass ribbon G gradually hardens while flowing over the molten metal M. The glass ribbon G is lifted from the molten metal M in the downstream area of the bath 11 and conveyed toward the annealing furnace 21 by the lift rollers 33. Then, the glass ribbon G is gradually cooled in the slow cooling furnace 21 while being conveyed by the slow cooling rolls 22. The glass ribbon G has a flat portion between both side edge portions. The glass ribbon G is cut after slow cooling because both side edge portions are thicker than the flat portions of the glass ribbon G. Thus, float glass having a substantially uniform thickness can be obtained.
In the above-described lifting step, since the glass ribbon G immediately after separation from the molten metal M is supported, heat removal occurs, and temperature unevenness due to a difference in thickness between the flat portion and both side edge portions of the glass ribbon G can occur. Therefore, by the configuration in which the support rollers of the present embodiment are mounted on the lift rollers 33 that convey the high-temperature glass ribbon G immediately after separation from the molten metal M, the glass ribbon G can be conveyed while suppressing heat removal and temperature unevenness to a minimum.
Further, the present embodiment may be implemented by a configuration in which the slow cooling roller 22 disposed in the slow cooling furnace 21 is mounted with the support roller (lift roller 33) of the present embodiment. In this case, the application to the slow cooling roll 22 on the upstream side is particularly preferable.
The float glass to be produced has a thickness of, for example, 0.8mm or less. In this case, the flat portion of the glass ribbon G has a thickness of 0.8mm or less, and the flat portion of the glass ribbon G has a smaller heat capacity than general-purpose float glass having a thickness of about 2 to 6 mm. Therefore, the sensible heat (heat) taken from the forming apparatus 10 to the interface 30 is small, the glass ribbon G is easily cooled, and temperature unevenness due to a difference in thickness between the flat portion and both side edge portions of the glass ribbon G is easily generated. Therefore, when float glass having a thickness of 0.8mm or less is manufactured, the effect of suppressing heat removal and temperature unevenness can be remarkably obtained by performing the lifting step of supporting the glass ribbon G by the lifting roller 33 having the heater 360 mounted thereon according to the present embodiment. The effect described above becomes more remarkable as the thickness of the float glass to be produced becomes thinner, and the thickness is preferably 0.05mm to 0.5 mm.
The float glass produced can be used as, for example, a glass substrate for a display, a cover glass for a display, or a window glass.
When the float glass to be produced is used as a glass substrate for a display, it may be alkali-free glass. The alkali-free glass does not substantially contain Na2O、K2O、Li2And alkali metal oxide glasses such as O.
[ second embodiment ]
Next, a second embodiment will be described with reference to fig. 4.
Since the present embodiment has substantially the same technical idea as the first embodiment, the following description will focus on differences.
The present embodiment is different from the first embodiment only in the structure for forming the temperature distribution in the width direction of the heater.
The heater 360A of the present embodiment is configured such that a plurality of heat generating portions 361 are formed by dividing in the width direction, and a temperature distribution is formed in each of the heat generating portions 361 by performing power control by a power control device 70 (corresponding to a power control unit). The heat generating parts are divided into 3 heat generating parts 361-1 to 361-3, but the present invention is not limited thereto. The heating portions 361-1 to 361-3 are connected to different power supply units 71, respectively. The power control device 70 controls appropriate power supply to the heat generating portions 361-1 to 361-3, respectively, thereby adjusting the temperature so as to avoid temperature unevenness in the width direction of the glass ribbon G. The power control device 70 is provided outside the interface device, for example. The electric wires W connected to the heat-generating members 361-1 to 361-3 are inserted through the hollow portion J of the shaft 362, the hollow portion K of the thermal expansion absorbing mechanism 60, and the hollow portion I of the rotating shaft 350R, and are accommodated in the slip ring 50, as described above.
The heater mounted inside the backup roller (lift roller 33A) of the second embodiment is divided into a plurality of heat generating portions in the width direction thereof, and individual power control by the power control device 70 is performed in each of the heat generating portions 361-1 to 361-3.
Therefore, an optimum temperature distribution is formed according to the type and environment of the medium to be supported (glass ribbon G or the like) supported (conveyed) by the support rollers, and the quality of the medium to be supported can be improved. Incidentally, the same effects as those described in the first embodiment can be obtained.
Although the embodiments have been described above with reference to the backup roll, the lift roll, and the slow cooling roll in the float glass manufacturing method as examples, the present invention is not limited to the above-described embodiments, and various modifications and improvements can be made within the scope of the gist of the present invention described in the claims. For example, the present invention is not limited to a float glass production method, and may be used for a backup roll mounted on a production apparatus for producing a mother glass.
The present invention can be suitably applied to a method for producing a glass sheet by molding glass having a sheet shape. Examples of the method for forming the glass in a ribbon shape include a drawing method, a melting method, a flow-hole drawing method, a roll forming method, a rolling method, a lifting method, and the like.
For example, the melt molding method can be suitably used for a supporting device such as a forming roll, a pulling roll, a guide roll, and a cooling roll used in a molding chamber, a slow cooling chamber, or a connecting portion thereof.
The present invention can also be used for reprocessing, reshaping, surface treatment, and the like (so-called off-line process) of a glass roll in which a glass sheet or a glass film is wound into a roll or a glass plate cut into individual pieces.
Claims (9)
1. A support roller for supporting a high-temperature supported medium conveyed in a chamber, the support roller comprising:
a hollow support main body portion for supporting the supported medium; and
a hollow rotary shaft connected to at least one end of the support body,
a heater is mounted in the hollow portion of the support main body portion, the heater rotating together with the support main body portion and the rotation shaft portion,
the backup roller has a thermal expansion absorbing mechanism that absorbs thermal expansion of the heater,
the thermal expansion absorbing mechanism is provided at least one of support points supporting the heater,
the thermal expansion absorbing mechanism has a cylindrical portion forming a hollow portion of the thermal expansion absorbing mechanism,
the cylindrical portion is non-fixedly housed in the hollow portion of the rotating shaft portion, and the hollow portion of the thermal expansion absorbing mechanism communicates with the hollow portion of the rotating shaft portion and is inserted with a power supply line.
2. The support roller according to claim 1, wherein,
the heater is capable of forming a temperature distribution in the width direction.
3. The support roller according to claim 2,
the heater forms the temperature distribution by changing the arrangement density of the heating elements in the width direction.
4. The support roller according to claim 2,
the heater is divided into a plurality of sections in the width direction, and power control by a power control unit is performed for each section to form the temperature distribution.
5. The support roller according to claim 1, wherein,
the support main body part has an outer diameter of 500mm or less and a length of 1000mm or more, and a ratio of the outer diameter to the length is 20% or less.
6. A method for producing a glass sheet, comprising the step of carrying a glass sheet while supporting the glass sheet with the support roller according to any one of claims 1 to 5.
7. The method for manufacturing glass plate according to claim 6,
the method for manufacturing a glass plate comprises a slow cooling step of carrying out slow cooling while conveying the glass by using a slow cooling roller,
in the slow cooling step, a part of the slow cooling roll is used as the support roll.
8. The method for manufacturing glass plate according to claim 6,
the method for producing a glass sheet comprises a lifting step of lifting a glass ribbon from a bath surface on a molten metal by using a lifting roller and conveying the glass ribbon to a slow cooling furnace,
in the lifting step, the lifting roller is used as the support roller.
9. The method for manufacturing glass plate according to claim 6,
the thickness of the glass plate is 0.8mm or less.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015-092348 | 2015-04-28 | ||
| JP2015092348A JP2016210630A (en) | 2015-04-28 | 2015-04-28 | Support roll, and production method of glass sheet |
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| Publication Number | Publication Date |
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| CN106082627A CN106082627A (en) | 2016-11-09 |
| CN106082627B true CN106082627B (en) | 2021-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610273691.1A Active CN106082627B (en) | 2015-04-28 | 2016-04-28 | Backup roll and method for manufacturing glass plate |
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| Country | Link |
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| JP (1) | JP2016210630A (en) |
| KR (1) | KR20160128212A (en) |
| CN (1) | CN106082627B (en) |
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| CN110963694B (en) * | 2019-12-27 | 2024-01-12 | 蚌埠中光电科技有限公司 | Automatic lifting device for transition roller table curtain of float glass production line |
| CN114920446B (en) * | 2022-06-09 | 2024-02-20 | 浙江飞洋杯业有限公司 | Forming equipment for glass bottle |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3217176B2 (en) | 1993-02-05 | 2001-10-09 | 旭硝子株式会社 | Method and apparatus for manufacturing float glass |
| JPH07271231A (en) * | 1994-04-01 | 1995-10-20 | Ricoh Co Ltd | Heat roller type fixing device |
| JP4716705B2 (en) * | 2004-10-13 | 2011-07-06 | トクデン株式会社 | Heat treatment roller |
| CN2747051Y (en) * | 2004-11-26 | 2005-12-21 | 上海泓阳机械有限公司 | Rollers for large rubber processing machine and calender |
| WO2009014028A1 (en) * | 2007-07-23 | 2009-01-29 | Asahi Glass Co., Ltd. | Float glass making process and float glass making equipment |
| WO2009063643A1 (en) * | 2007-11-16 | 2009-05-22 | Panasonic Corporation | Heat generator unit and heating device |
| JPWO2010147189A1 (en) * | 2009-06-19 | 2012-12-06 | 旭硝子株式会社 | Top roll, float glass manufacturing apparatus, and float glass manufacturing method |
| BRPI1002370A2 (en) * | 2010-07-01 | 2012-03-13 | Antonio Oecksler Airton | CAST SILK ROLLER WITH HEATING SYSTEM FOR GLASS TEMPERATURE AND THERMAL MATERIAL TREATMENT |
| WO2012172722A1 (en) * | 2011-06-15 | 2012-12-20 | パナソニック株式会社 | Substrate conveyance roller, thin film manufacturing device and thin film manufacturing method |
| CN103108840B (en) * | 2011-06-30 | 2015-02-25 | 安瀚视特控股株式会社 | Glass plate manufacturing method and glass plate manufacturing device |
| CN203015162U (en) * | 2012-12-28 | 2013-06-19 | 上海杜纳斯机电设备有限公司 | Electromagnetic induction heating roller device |
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| KR20160128212A (en) | 2016-11-07 |
| JP2016210630A (en) | 2016-12-15 |
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