JP6536358B2 - Flat glass manufacturing apparatus and flat glass manufacturing method - Google Patents

Description

  The present invention relates to a plate glass manufacturing apparatus and a method of manufacturing a plate glass.

  DESCRIPTION OF RELATED ART Conventionally, as shown, for example to patent document 1, the roll out method is known as 1 type of shaping | molding methods of plate glass. In the roll-out method, molten glass is caused to flow down from the opening of the glass supply unit, and the molten glass is rolled by a pair of forming rollers disposed immediately below the glass supply unit to form a sheet glass. At this time, a liquid glass pool of molten glass is formed over the pair of forming rollers, the liquid glass pool extending in the axial direction of the roller than the opening width of the glass supply unit, and the liquid pool is rolled by a forming roller to form a glass sheet. Thereby, the plate glass of the plate | board width according to the spread width of the liquid pool of a molten glass is obtained.

Patent No. 4788951

  However, in the above manufacturing method, if the temperature drops while the liquid pool spreads on the pair of forming rollers and the temperature unevenness occurs in the spread width direction of the liquid pool, the characteristics (thickness etc.) of the sheet glass to be formed Is uneven in the width direction, which contributes to the deterioration of the sheet glass.

  This invention was made in order to solve the said subject, Comprising: The objective is the manufacturing method of the plate glass which can suppress the temperature nonuniformity of the liquid pool of a molten glass formed on a pair of forming rollers, and a plate glass. To provide.

  The plate glass manufacturing apparatus which solves the said subject is provided with the molten glass supply part which has a supply port, and a pair of forming roller which rolls the molten glass flowed down from the said supply port, Roll-out shaping | molding said molten glass and plate glass And a cover member provided between the molten glass supply unit and the forming roller and covering the upper side of the molten glass pool on the forming roller.

  According to this configuration, since the liquid pool on the forming roller is covered by the cover member, it is possible to suppress the radiation due to the radiation heat of the liquid pool or the convection heat transfer by the cover member. As a result, it is possible to suppress the temperature from decreasing while the liquid pool spreads on the forming roller, and therefore it is possible to suppress the temperature unevenness of the liquid pool. As a result, it can suppress that the characteristics (thickness etc.) of the plate glass shape | molded by rolling a liquid reservoir disperse | distribute to the width direction can contribute to the quality improvement of the plate glass to shape | mold.

In the plate glass manufacturing apparatus, it is preferable that a lower surface of the cover member facing the liquid reservoir has a concave surface which is recessed upward.
According to this configuration, the lower surface of the cover member facing the liquid pool forms a concave surface that is recessed upward, so that the convective heat transfer around the liquid pool can be suitably suppressed. Therefore, the temperature fall of a liquid pool is further suppressed, and the temperature nonuniformity of a liquid pool can be suppressed more suitably.

  In the above-described plate glass manufacturing apparatus, it is preferable that the surface of the cover member facing the liquid pool be formed of a plated film of a metal material having a heat reflectance higher than that of the constituent material of the cover member.

  According to this configuration, the radiant heat of the liquid pool can be suitably reflected by the facing surface of the cover member on which the plating film is applied. Therefore, the temperature fall of a liquid pool is further suppressed, and the temperature nonuniformity of a liquid pool can be suppressed more suitably.

In the above-described plate glass manufacturing apparatus, it is preferable that a surface of the cover member facing the liquid pool has a mirror surface.
According to this configuration, the surface of the cover member facing the liquid reservoir forms a mirror surface, whereby the radiant heat of the liquid reservoir can be suitably reflected. Therefore, the temperature fall of a liquid pool is further suppressed, and the temperature nonuniformity of a liquid pool can be suppressed more suitably.

  In the above-described plate glass manufacturing apparatus, the cover member includes an upper covering portion covering the upper side of the liquid reservoir, and a side wall portion extending downward from the upper covering portion, and the side wall portion is in the axial direction of the forming roller. It is preferable to be located outside the end of the liquid pool in the axial direction.

  According to this configuration, since the side wall portion of the cover member is located axially outside (the side farther from the supply port) than the end portion of the liquid pool in the axial direction of the forming roller, convection around the liquid pool is caused by the side wall portion Can be made difficult to escape axially outward, whereby the temperature drop of the liquid pool can be further suppressed.

In the above-described plate glass manufacturing apparatus, preferably, the cover members are disposed on both sides of the supply port in the axial direction of the forming roller.
According to this configuration, since the liquid reservoir spreading on both sides from the position directly below the supply port can be covered by the cover member, the temperature drop of the liquid reservoir can be suitably suppressed.

In the said plate glass manufacturing apparatus, it is preferable to provide the height adjustment part which can adjust the position of the up-down direction of the said cover member.
According to this configuration, the height adjustment unit capable of adjusting the vertical position of the cover member is provided. The height in the vertical direction of the liquid pool differs depending on the thickness and width of the sheet glass to be formed, and the vertical position of the cover member can be adjusted according to the height of the liquid pool. For this reason, the problem that a cover member contacts a liquid pool can be prevented.

  In the above-described plate glass manufacturing apparatus, the cover member is movable from a use position covering the upper side of the liquid reservoir to a retracted position not in contact with the liquid reservoir when the pair of forming rollers is axially drawn and replaced. Preferably, a moving mechanism is provided.

  According to this configuration, when the pair of forming rollers is pulled out in the axial direction and replaced, the cover member is moved to the retracted position not in contact with the liquid pool by the moving mechanism, thereby causing contact with the liquid glass pool. It is possible to prevent the cover member from being damaged.

  The manufacturing method of the sheet glass which solves the said subject flows down a molten glass on a pair of forming roller from the supply port of a molten glass supply part, roll-out forms the said molten glass with this pair of forming rollers, and manufactures a sheet glass. In the manufacturing method of sheet glass, a cover member which covers the upper part of a pool of molten glass on the forming roller is disposed between the molten glass supply portion and the forming roller.

  According to this manufacturing method, since the liquid pool on the forming roller is covered by the cover member, it is possible to suppress the temperature from being reduced while the liquid pool spreads on the forming roller. Thereby, since the temperature non-uniformity of the liquid pool can be suppressed, it can be suppressed that the characteristics (thickness etc.) of the sheet glass formed by rolling the liquid pool are uneven in the width direction, and as a result, the quality of the sheet glass to be formed is improved. It can contribute.

  According to the plate glass manufacturing apparatus and the plate glass manufacturing method of the present invention, it is possible to suppress temperature unevenness of liquid pool of molten glass formed on the pair of forming rollers.

It is a perspective view which shows schematic structure of the plate glass manufacturing apparatus of embodiment. It is a front view of the plate glass manufacturing apparatus of the form. It is a top view which shows the plate glass manufacturing apparatus of the form typically. It is line 4-4 in FIG. 3 sectional drawing.

  Hereinafter, one embodiment of a plate glass manufacturing apparatus and a method of manufacturing a plate glass will be described. In the drawings, for convenience of explanation, a part of the configuration may be shown exaggerated. Also, the dimensional ratio of each part may be different from the actual one.

  As shown in FIG.1 and FIG.2, the plate glass manufacturing apparatus 10 of this embodiment is an installation using the manufacturing method of the plate glass by a roll-out method. The plate glass manufacturing apparatus 10 includes a molten glass supply unit 11 having a supply port 11a for flowing the molten glass MG down, and a pair of forming rollers 12 for rolling the molten glass MG flowing down from the supply port 11a. The molten glass supply unit 11 causes the molten glass MG supplied from the melting furnace (not shown) via the feeder to flow down from the supply port 11 a.

  The pair of forming rollers 12 are formed so that their outer diameters are equal to each other, and are arranged in parallel in the front-rear direction X of the plate glass manufacturing apparatus 10 with a predetermined gap. Further, each forming roller 12 is disposed so that the axial direction thereof is along the width direction Y of the plate glass manufacturing apparatus 10. Hereinafter, the axial direction of the forming roller 12 is referred to as a roller axial direction.

  The molten glass MG is made to flow down from the supply port 11a between the pair of forming rollers 12, and the molten glass MG spreads on both sides in the roller axial direction (width direction Y) from the position directly below the supply port 11a. Liquid pool P is formed. The pair of forming rollers 12 rotate in opposite directions so as to wind the liquid pool P of the molten glass MG downward, and roll the liquid pool P between the forming rollers 12 to form the sheet glass G. . Thereby, the plate glass G having a plate width corresponding to the spread width of the liquid pool P in the roller axial direction is formed.

Here, the plate glass manufacturing apparatus 10 of the present embodiment includes a pair of cover members 13 and 14 for keeping the molten glass MG (liquid pool P) on the forming roller 12 warm.
The supporting structure of the cover members 13 and 14 will be described. As shown in FIG. 1, a pair of rail members 15 disposed along the roller axial direction (width direction Y) includes a pair of members extending along the vertical direction Z A pivot shaft 16 is supported. The base end of the support arm 17 is fixed to the upper end of each pivot shaft 16, and the cover members 13 and 14 are fixed to the tip of the support arm 17, respectively. Each pivot shaft 16 is provided to the rail member 15 via a height adjustment unit 18.

  Each height adjustment portion 18 is provided on the rail member 15 so as to be movable in the width direction Y. Further, each height adjustment unit 18 supports the pivot shaft 16 so that the position of the pivot shaft 16 in the vertical direction Z can be adjusted. In each height adjustment unit 18, a screw mechanism or the like can be used as a mechanism for adjusting the position of the rotating shaft 16 in the vertical direction Z. Adjustment of the position of the cover members 13 and 14 in the vertical direction Z is possible by adjusting the position of the pivot shaft 16 in the vertical direction Z by the height adjustment units 18.

  In addition, each pivot shaft 16 is provided rotatably with respect to the height adjustment unit 18, and a moving mechanism in which the support arm 17 and the cover members 13 and 14 pivot as the pivot shaft 16 pivots. It has become. Thereby, each cover member 13 and 14 is comprised so that rotation is possible from a use position (it shows by a continuous line in FIG. 3) to a retracted position (it shows by a two-dot chain line in FIG. 3). The cover members 13 and 14 in the use position are, as shown in FIG. 2, a position between the lower surface 11 b of the molten glass supply portion 11 and the forming roller 12 and in the width direction Y It is arranged on both sides respectively.

  As shown in FIGS. 1, 3 and 4, each of the cover members 13 and 14 is made of, for example, stainless steel, and has an arc-shaped upper covering portion 21 and a side wall portion 22. In a state where the respective cover members 13 and 14 are in the use position, the upper covering portion 21 is a portion (spreading portion Pa) which spreads on both sides in the roller axial direction from the position directly below the supply port 11a in the liquid pool P on the forming roller 12 Covering the top of the Further, the upper cover portion 21 has an arc shape which is convex upward as viewed from the roller axial direction (width direction Y) in the state of being in the use position (see FIG. 4). That is, the spreading portion Pa of the liquid reservoir P in the upper covering portion 21 and the lower surface 21a opposed to the vertical direction Z form a concave surface which is recessed upward. In the present embodiment, the shape of the upper covering portion 21 is an arc shape that follows the cross-sectional shape (upper surface shape) orthogonal to the roller axial direction of the liquid reservoir P on the forming roller 12.

  As shown in FIG. 3, in the roller axial direction outer end portion (end portion on the side far from the supply port 11 a) in the upper covering portion 21 of each cover member 13, 14 with respect to the width direction of the cover members 13, 14 A side wall 22 having a vertical planar shape is formed. The side wall portion 22 is formed to extend from the upper covering portion 21 to the lower side (the forming roller 12 side).

  In the state where one of the cover members 13 is in the use position, the side wall 22 of the cover member 13 is axially outer than the one end Pb of the liquid pool P in the roller axial direction (the side farther from the supply port 11a) It is located in Further, in the state where the other cover member 14 is in the use position, the side wall 22 of the cover member 14 is axially outer than the other end Pc of the liquid pool P in the roller axial direction (further from the supply port 11a Located on the side). Further, in the present embodiment, on the lower surface 21a of the upper covering portion 21 and the inner side surface 22a of the side wall portion 22, a metal material (for example, silver) having a heat reflectance higher than that of the constituent material (stainless steel) of the cover members 13 and 14 The plating film 23 which consists of these is provided.

Next, the operation of the present embodiment will be described.
At the time of roll-out forming of the sheet glass G by the pair of forming rollers 12, the spread portion Pa of the liquid pool P (molten glass MG) formed on the forming roller 12 is covered with the cover members 13 and 14 upward. As a result, as shown by the broken arrow in FIG. 4, the radiant heat emitted from the spread portion Pa of the liquid reservoir P is directed downward (liquid reservoir P side) by the lower surface 21a of the upper covering portion 21 of the cover members 13 and 14. Since the light is reflected, the heat radiation due to the radiant heat of the spread portion Pa is suppressed, and as a result, the temperature drop of the liquid pool P can be suppressed. In addition, convective heat transfer around the spread site Pa of the liquid pool P is suppressed by covering the upper side of the spread site Pa of the liquid pool P by the respective cover members 13 and 14, which also causes the temperature drop of the liquid pool P. It can be suppressed.

  Here, since the lower surface 21a of the upper covering portion 21 has a circular arc shape which is convex upward as viewed from the roller axial direction (width direction Y), radiation heat emitted radially from the liquid reservoir P as viewed from the roller axial direction Since the light is reflected toward the liquid reservoir P, the temperature drop of the liquid reservoir P is further suppressed. Furthermore, since the plating film 23 is formed on the lower surface 21 a of the upper covering portion 21, the radiant heat of the spread site Pa of the liquid pool P can be more suitably reflected, and the temperature drop of the liquid pool P is further reduced. Be suppressed.

  Further, in the present embodiment, the cover members 13 and 14 each include the side wall portion 22 extending from the upper covering portion 21 to the lower side (the forming roller 12 side) and perpendicular to the roller axial direction. It is possible to make it difficult for the convection around the liquid reservoir P to escape to the side in the roller axial direction, which also suppresses the temperature drop of the liquid reservoir P.

Next, an exchange aspect of the pair of forming rollers 12 will be described.
As shown in FIG. 3, when replacing each forming roller 12, first, for example, in a direction in which the cover members 13 and 14 are separated from the supply port 11 a with the pivot shaft 16 along the vertical direction Z as an axis Rotate 90 degrees. As a result, the cover members 13 and 14 are retracted to positions where they do not overlap the forming roller 12 in plan view.

  Thereafter, each forming roller 12 is moved in the axial direction while the molten glass MG is allowed to flow down from the supply port 11 a of the molten glass supply unit 11. At this time, the forming roller 12 may bring along the molten glass MG (liquid pool P), but since the cover members 13 and 14 are moved to the retracted position, the cover members 13 and 14 are pulled together and melted. It does not come in contact with the glass MG.

Next, characteristic effects of the present embodiment will be described.
(1) Between the molten glass supply unit 11 and the forming roller 12, a pair of cover members 13 and 14 covering the upper side of the spread portion Pa of the liquid pool P (the molten glass MG) on the forming roller 12 is provided. The cover members 13 and 14 can suppress heat radiation due to radiant heat and convective heat transfer of the spread portion Pa of the liquid pool P, so that temperature decrease of the spread portion Pa can be suppressed, whereby temperature unevenness of the liquid pool P is suppressed. it can. As a result, it is possible to suppress variation in characteristics (thickness and the like) of the sheet glass G formed by rolling the liquid pool P in the width direction Y, which can contribute to quality improvement of the sheet glass G to be formed.

  Further, as a method of suppressing the temperature drop of the spread portion Pa of the liquid pool P, the spread portion Pa of the liquid pool P is directly heated by the flame of the burner other than the method of covering with the cover members 13 and 14 as in this embodiment. There is a way to do it. However, in this method, since the air flow is generated by the heat of the flame of the burner, for example, dust and the like on the air flow may be attached to the molten glass MG and the sheet glass G. In this respect, in the present embodiment, since it is not necessary to heat the spread portion Pa of the liquid pool P with the burner, the temperature of the spread portion Pa of the liquid pool P is suppressed while the adhesion of dust to the molten glass MG and the plate glass G is suppressed. It is possible to suppress the decline.

  In addition, the cover members 13 and 14 cover the upper side of the liquid pool P on the forming roller 12, so that the falling objects from above (the molten glass supply portion 11 side) are prevented from adhering to the liquid pool P. And, it is possible to prevent the fallen matter from being mixed in the glass sheet G and causing the deterioration of the quality.

  (2) Since the lower surface (the lower surface 21a of the upper cover portion 21) facing the liquid pool P in the cover members 13 and 14 is concaved upward, the convective heat transfer around the liquid pool P can be suitably suppressed. Therefore, the temperature drop of the spread part Pa of the liquid reservoir P is further suppressed, and the temperature unevenness of the liquid reservoir P can be more suitably suppressed.

  (3) The surface of the cover members 13 and 14 facing the liquid pool P (the lower surface 21a of the upper cover 21 and the inner side surface 22a of the side wall 22) is more thermally conductive than the material (stainless steel) of the cover members 13 and 14 The radiation heat of the liquid pool P can be suitably reflected to the lower side (liquid pool P side) by the plating film 23 of a metal material (for example, silver) having a high reflectance, on the opposite surface. Therefore, the temperature drop of the spread part Pa of the liquid reservoir P is further suppressed, and the temperature unevenness of the liquid reservoir P can be more suitably suppressed.

  (4) The cover members 13 and 14 each include the upper covering portion 21 which covers the upper side of the spreading portion Pa of the liquid reservoir P, and the side wall portion 22 extending downward from the upper covering portion 21. The side wall portion 22 of 14 is located axially outside the end portions Pb, Pc of the liquid pool P in the roller axial direction (the side farther from the supply port 11 a). According to this configuration, the convection around the spreading portion Pa of the liquid pool P can be made less likely to escape to the side in the roller axial direction by the side wall portion 22, whereby the temperature drop of the spreading portion Pa of the liquid pool P It is further suppressed. Further, by providing the side wall portion 22 on the cover members 13 and 14, the rigidity of the cover members 13 and 14 can be improved.

  (5) The cover members 13 and 14 are disposed on both sides of the supply port 11a in the roller axial direction. As a result, since the spreading portions Pa of the liquid pool P spreading from both immediately below the supply port 11a to both sides in the roller axial direction can be covered by the cover members 13 and 14, respectively, the temperature drop at the spreading portions Pa on both sides is suitably reduced. It can be suppressed.

  (6) A height adjustment unit 18 is provided which can adjust the position of the cover members 13 and 14 in the vertical direction Z. The height in the vertical direction Z of the liquid reservoir P varies depending on the thickness and width of the sheet glass G to be formed, and the position of the cover members 13 and 14 in the vertical direction Z may be adjusted according to the height of the liquid reservoir P it can. For this reason, the problem that the cover members 13 and 14 contact the liquid pool P can be prevented.

  (7) From the use position where cover members 13 and 14 cover the upper side of spread portion Pa of liquid reservoir P, when the pair of forming rollers 12 is axially pulled out and replaced, contact with molten glass MG (liquid reservoir P) A moving mechanism (a pivoting shaft 16 and a support arm 17) is provided which can move to a retracted position where it does not move. According to this configuration, when the pair of forming rollers 12 is pulled out in the axial direction to be replaced, the cover members 13 and 14 are moved to the retracted position not in contact with the molten glass MG by the moving mechanism. Can prevent the cover members 13 and 14 from being damaged. Further, even when some abnormality occurs and the height of the liquid reservoir P rises, the cover members 13 and 14 are rotated to the retracted position, thereby preventing the contact between the cover members 13 and 14 and the liquid reservoir P, Damage to the cover members 13 and 14 can be prevented.

  (8) Since each cover member 13 and 14 is configured to be movable along the rail member 15 in the roller axial direction (width direction Y), each cover member according to the spread width of the liquid reservoir P in the roller axial direction The position along the roller axis direction of 13, 14 can be adjusted.

The above embodiment may be modified as follows.
In the cover members 13 and 14 of the above embodiment, the plating film 23 is formed on each of the lower surface 21a of the upper covering portion 21 and the inner side surface 22a of the side wall portion 22. The plating film 23 may be formed only on the lower surface 21 a of the upper covering portion 21.

  Moreover, although it was set as the silver plating film 23 in the said embodiment, if the material whose heat reflectance is superior to the metal material (stainless steel in the said embodiment) which comprises the cover members 13 and 14, it will be except silver It is good as a metal plating film of

  Further, in the above embodiment, the plating film 23 is formed on the lower surface 21a of the upper covering portion 21 and the inner side surface 22a of the side wall portion 22 in order to improve the heat reflectance of the surface of the cover members 13 and 14 facing the liquid pool P. However, it is not particularly limited thereto. When the plating film 23 is not formed, by making the lower surface 21a of the upper covering portion 21 and the inner side surface 22a of the side wall portion 22 a mirror surface, the radiant heat of the liquid pool P can be suitably reflected.

  In the above embodiment, the cover members 13 and 14 are pivotable to the retracted position. However, the present invention is not limited thereto. Only the cover member on the side from which the forming roller 12 is pulled out when replacing the forming roller 12 is pivoted to the retracted position. It may be configured as possible.

  Further, in the above embodiment, the cover members 13 and 14 are rotated to move to the retracted position, but by sliding the cover members 13 and 14 in the front-rear direction X, the forming roller 12 is axially moved. It may be moved to a position not in contact with the molten glass MG at the time of drawing and replacing.

  -The shape of each cover member 13 and 14 is not limited to the said embodiment, According to a structure, you may change suitably. For example, in the above embodiment, the upper covering portion 21 of each of the cover members 13 and 14 is formed in an arc shape in a cross-sectional shape orthogonal to the roller axis direction. You may form in a U-shape. Further, the side wall portion 22 may be omitted from the cover members 13 and 14 of the above embodiment, or furthermore, the cover members 13 and 14 may be formed in a flat plate shape orthogonal to the vertical direction Z.

-The support structure of each cover member 13 and 14 is not limited to the said embodiment, According to a structure, you may change suitably.
-The above-mentioned embodiment and each modification may be combined suitably.

  DESCRIPTION OF SYMBOLS 10 ... Plate glass manufacturing apparatus, 11 ... Molten glass supply part, 11a ... Supply port, 12 ... Forming roller, 13, 14 ... Cover member, 16 ... Pivot shaft (moving mechanism), 17 ... Support arm (moving mechanism), 18 ... height adjustment portion, 21 ... upper covering portion, 21a ... lower surface (facing surface) of upper coating portion, 22 ... side wall portion, 22a ... inner side surface (facing surface) of side wall portion, 23 ... plating film, MG ... molten glass , P ... liquid pool, G ... plate glass.

Claims (9)

A sheet glass manufacturing apparatus comprising: a molten glass supply section having a supply port; and a pair of forming rollers rolling the molten glass flowing down from the supply port, wherein the molten glass is roll-out molded to manufacture a sheet glass,
A sheet glass manufacturing apparatus comprising: a cover member provided between the molten glass supply portion and the forming roller and covering an upper portion of a molten glass pool on the forming roller.   The flat glass manufacturing apparatus according to claim 1, wherein a lower surface of the cover member facing the liquid pool has a concave surface which is recessed upward.   The opposing surface with the said liquid pool in the said cover member is comprised with the plating film of the metal material whose heat reflectivity is higher than the constituent material of this cover member, It is characterized by the above-mentioned. Flat glass manufacturing equipment.   The flat glass manufacturing apparatus according to any one of claims 1 to 3, wherein a surface of the cover member facing the liquid pool is a mirror surface. The cover member includes an upper covering portion covering the upper side of the liquid pool, and a side wall portion extending downward from the upper covering portion.
The said side wall part is located in the axial direction outer side rather than the edge part of the said liquid pool in the axial direction of the said forming roller, The plate glass manufacturing apparatus of any one of the Claims 1-4 characterized by the above-mentioned.   The said cover member is each arrange | positioned at the both sides of the said supply port in the axial direction of the said shaping | molding roller, The plate glass manufacturing apparatus of any one of Claims 1-5 characterized by the above-mentioned.   The sheet glass manufacturing apparatus according to any one of claims 1 to 6, further comprising: a height adjustment unit capable of adjusting the position of the cover member in the vertical direction.   The cover member has a moving mechanism that can move from a use position covering the upper side of the liquid reservoir to a retracted position not in contact with the liquid reservoir when the pair of forming rollers is axially pulled out and replaced. The plate glass manufacturing apparatus of any one of the Claims 1-7 characterized by the above-mentioned. A method of manufacturing a sheet glass, comprising: flowing molten glass down onto a pair of forming rollers from a supply port of a molten glass supply portion; and rolling out the molten glass with the pair of forming rollers to produce a sheet glass,
A method of manufacturing a sheet glass, comprising: arranging a cover member covering an upper part of a molten glass pool on the forming roller between the molten glass supply portion and the forming roller.

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