TW201038499A - Device for stirring molten glass - Google Patents

Abstract

A molten-glass stirring device by which molten glass having a viscosity of 100-7,000 dPas is stirred in a molten-glass conveyance pipe through which the molten glass is conveyed at a rate of 1-50 m3/hrS (wherein S is the sectional area of the conveyance pipe). The molten-glass stirring device is composed of a rotatable center shaft and a stirring part disposed on the center shaft. The stirring part is composed of lateral stirring blades and vertical stirring blades, each blade comprising a platy object. The lateral stirring blades have been disposed so that the longer sides are perpendicular to the center shaft and the shorter sides are inclined toward the axial direction of the center shaft at 10-70 degrees. The vertical stirring blades have been disposed so that the longer sides are parallel to the center shaft and are located in positions that define the periphery of the stirring part. When the diameter of the molten-glass conveyance pipe in the portion where the stirring part has been disposed is expressed by D1 (mm) and the maximum diameter of the periphery of the stirring part is expressed by D2 (mm), then D1 and D2 satisfy 0.8D1=D2=0.98D1.

Description

201038499 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a smelting and breaking-mixing device which is used in a molten glass conveying pipe for conveying molten glass, especially as a large FPD (four) ipanei

DispIay' flat panel display) The glass-like glass-making device is used to melt glass. The molten glass is conveyed in a high-flowing glass. f. Prior art j] Ο 先前 For the purpose of improving the uniformity of (4) glass, install the right 撙 in the molten glass transfer tube that transports the fused glass. The 壮 衮 衮 衮 has a stirring device to stir the molten glass. The uniformity of the molten glass greatly affects the transparency and thickness of the produced glass. The relay generally includes a center shaft that becomes a center of rotation, and a stirring portion that has a stirring fin attached around the center shaft. In order to sufficiently knit the molten glass to be conveyed, it is necessary to prevent the phenomenon of melting in the molten glass (four) mixing device, that is, the so-called "squeezing" when the molten glass in the molten glass conveying pipe is stirred by the pouring device. Since the smelted glass that has been squeezed is not sufficiently stirred, it is contained in a large amount of a component different from the composition of the molten glass by reacting with a monument or a gas phase constituting the molten glass transfer tube, that is, the so-called Γ里皙#8U When the glass is melted and formed into a glass product after the product is formed, the foreign component becomes a stripe-like defect called a so-called spot. That is, in order to make the molten glass, the enamel component is diffused into the molten glaze by sufficiently mixing the glazed glass. In Patent Document 1, in order to reduce the 146724.doc 201038499 'melting glass which is squeezed along the wall surface of the flow path, it is proposed to use the 'mixer of the fan' to reduce the wall surface spectrum. The outermost side of the agitating fins spaced apart from the upper and lower jaws are provided with a plurality of convex portions. In the absence of ..., the far-disturbing device is still insufficient in preventing the extrusion near the wall surface of the flow path, and the mixing effect of the n-melting glass which is likely to occur around the central axis of the mixing device is not sufficient. / (4) device disclosed in Patent Document 2, for the purpose of improving the uniformity of dissolution of the glass, the agitating fins attached around the central axis are set to have a radius of rotation (4) (4) mixed wing pieces and short lining In the fin piece, the long agitating fin piece and the short agitating fin piece are alternately mounted in two or more pieces. However, even in the case of such a scrambler, the effect of preventing the extrusion of the vicinity of the wall surface of the flow path and the periphery of the shaft is not sufficient. Further, as a mechanism for stirring the molten glass for the purpose of improving the uniformity, there is also a molten glass stirring blade disclosed in Patent Document 3 below. [PRIOR ART DOCUMENT] [Patent Document 1] Japanese Patent Laid-Open Publication No. 2001-72426 [Patent Document 2] Japanese Patent Laid-Open Publication No. Hei. No. Hei. No. Hei. [Invention of the Invention] In recent years, in particular, glass substrates for large-sized FPDs are required to have no insoluble raw materials, high transparency, and high flatness. A glass with less defects and higher uniformity is required. 146724.doc 201038499 In addition, it is necessary to use glass for optical lenses, optical communication fibers, filters, solar cell substrates, fluorescent tubes, etc., which require high transparency. . • When s requires extremely uniform uniformity, it is difficult to obtain sufficient uniformity of the molten glass in the previous agitation. In order to solve the above problems, an object of the present invention is to provide a glass stirring apparatus which can prevent the molten glass from being squeezed in the stirring apparatus, and is more resistant to the vicinity of the wall surface of the conveying pipe and the center axis of the stirring device. The molten glass is extruded and the molten glass in the molten glass transfer tube is excellent in stirring action. [Technical means for solving the problem] " In order to achieve the above object, the present invention provides a molten glass stirring apparatus which is conveyed at a speed of 1 meg 3 / hour, S to 50 mV, which is the cross-sectional area of the conveying pipe) The conveying viscosity is 1〇〇dPa.s~7〇〇〇dpas2, and the molten glass is conveyed in the molten glass conveying pipe; the molten glass searching device comprises: a rotatable central axis; and a falling part, The glass agitating portion is formed by a horizontal feeding ring piece and a vertical feeding piece piece each including a plate-shaped body. The long side of the horizontal (four) wing piece is orthogonal to the central axis. And the short side is inclined (10) to 70 degrees in the axial direction of the central axis, and the long side of the longitudinally-disturbed mixing blade is placed parallel to the central axis, and is disposed at a position defining the outer edge of the agitating portion, and When the diameter of the molten glass conveying pipe in the portion where the stirring portion is provided is set to be ', and the maximum straightness of the outer edge of the upper (four) mixing portion is D2 (mm), 'satisfaction: 〇.8xDlsD2s〇98xDi . 146724.doc 201038499 λ 本本月 provides a seed glass breaking device, which comprises a glass refining device & a glass forming device, and a molten glass transport disposed between the glass dissolving device and the plate glass forming device In the above-mentioned melt-glass transfer tube, the medium-sized female is equipped with at least one of the above-described molten glass stirring devices of the present invention. Further, the present invention provides a molten glass stirring method using the molten glass stirring apparatus of the present invention. Further, the present invention provides a method for producing a sheet glass using the sheet glass manufacturing apparatus of the present invention. [Effects of the Invention] The glass stirring device of the present invention can prevent the molten glass from being squeezed in the stirring device, and more specifically, can prevent the molten glass near the wall surface of the molten glass transfer tube and the U-axis around the half-coating When it is squeezed, the molten glass in the smelting glass transfer pipe is excellent in the stirring action, and the uniformity of the molten glass after the stirring is excellent, whereby a glass substrate for FPD which is particularly suitable for a large size (for example, two or more claws) can be obtained. Glass with higher uniformity. As a result, it is possible to obtain a glass which is free from the incorporation of unmelted raw materials and which has high transparency and high flatness. Further, the glass agitating device of the present invention has excellent uniformity of the molten glass after stirring, and thus is required as an optical lens, an optical communication fiber, a filter, a solar cell substrate, a fluorescent tube, and the like. A molten glass stirring device for a glass manufacturing apparatus for use in transparency is also preferable. [Embodiment] Hereinafter, a glass mixing device of the present invention will be described with reference to the drawings. 146724.doc 201038499

The glass substrate for FPD has been increasing in size year by year, and it is increasingly required to mass-produce the glass substrate due to an increase in demand for it. In the equipment for manufacturing FpD-plate glass, it is required to increase the amount of molten glass conveyed. Also in the system -· & optical lenses, optical communication fibers, 'lighting devices, and solar cell bases. Equipment for glass used for boards, light pipes, etc., requires an increase in the amount of molten glass. As a method of increasing the amount of transport of the molten glass in the molten glass transfer pipe, there is a method of increasing the cross-sectional area of the molten glass transfer pipe and a method of increasing the flow rate of the molten glass in the molten glass transfer pipe. However, an extreme increase in the cross-sectional area of the molten glass conveying pipe leads to an increase in equipment cost and is therefore unsatisfactory. Further, when the flow rate of the molten glass in the molten glass transfer pipe is increased, the molten glass in the stirring device is likely to be squeezed, and the stirring action of the molten glass is liable to lower. The glass stirring device of the present invention is preferably used in a molten glass conveying pipe having a high conveying amount of the molten glass, and is specifically set at 3 msec to 1 mV. s to 50 m3/hr. The transport amount is preferably 2 m3 / hour. S ~ 5 〇 hours. s transport volume (8 is the cross-section of the transport tube 扪 transport viscosity is 100 dPa.s ~ 7_ dPa.s, preferably The molten glass is used in a molten glass transfer tube having a viscosity of 2 〇〇dPa_s to 6000 dPa.s. - Fig. 1 is a perspective view showing a portion of the glass mixing device of the present invention, and Fig. 2 is a plan view of the glass (four) device. Figure 3 is a side view of the glass stirring device. The glass mixing device 1 shown in Figures 1 to 3 includes a rotatable central shaft 10, 146724.doc 201038499. The stirring portion 20 is disposed at the lower end of the central shaft 10. The agitating portion 20 is composed of a vertical agitating fin 3 〇 and a lateral agitating fin 40 each including a plate-shaped body. The longitudinal agitating fin 30 including the plate-like body has a long side parallel to the central axis 1 、, and It is disposed at a position that defines the outer edge of the agitating portion 20. In other words, the horizontal agitating fins 40 are located in parallel. The center shaft 1〇 is interposed between the longitudinal agitating fins 3〇. The longitudinal agitating fins 30 mainly prevent the molten glass from being extruded near the wall surface of the molten glass conveying pipe, and have the function of stirring the molten glass. The vertical agitating fins 30 include the upper and lower sides. The support structures 30a, 3〇b extending in the direction of the center axis 1〇 are preferable from the viewpoint of the supporting strength of the longitudinal stirring fins 3. Therefore, when the supporting strength of the longitudinal stirring fins is obtained, there is no support. The structures 30a, 30b may also be. At this time, the longitudinal agitating fins 3〇 are indirectly supported by the central shaft 10 via the lateral agitating fins 4〇. However, the preferred crucible includes at least at least one of the supporting structures 3 〇a, 3 Ob Further, the support structures 30a, 30b may be provided at a portion other than the lower end of the vertical agitating fins 3 (the middle portion of the vertical agitating fins 30, etc.) (the supporting structure corresponding to 30a, 3Ob is disposed at Longitudinal stirring of the middle portion of the flap 3), but in consideration of the stirring action of the molten glass, it is preferably provided at the lower end of the vertical stirring fin 30. The glass crucible shown in Figs. 1 to 3; 1 includes 4 pieces of vertical search wings 3 〇, but this hair The number of the vertical agitating fins in the glass stirring device 1 of the present invention is not limited thereto. However, in order to exert the effect of preventing the extrusion of the molten glass in the vicinity of the wall surface of the molten glass conveying pipe, it is preferable to be located at the center axis. 1) Set at least 2 vertical stirring fins in the direction of 146724.doc 201038499. On the other hand, if the number of (4) fins is too large, it will hinder the mixing - (4) stirring, and the stirring part will rotate. The required torque is increased, and for these reasons, it is preferably 8 or less. • ^, the number of vertical (four) wing months is preferably 2 to 8, more preferably 3 to 6 . The size of the vertical agitation fins 30 is appropriately selected in accordance with the molten glass provided with the glass agitating device, the size of the transfer tube, the viscosity of the molten glass to be conveyed, or the amount of conveyance. However, the relationship between the maximum diameter 〇2 of the outer edge of the mixing portion 20 and the diameter Di of the conveying pipe 1〇〇 at the portion where the glass is provided is determined by the position at which the longitudinally-mixed flap is disposed; It is necessary to satisfy the following formula (1): • 0-8xDiSD2$0.98xDi (1) • # By satisfying the above formula (1), the function of the molten glass near the wall surface of the anti-cut glass transfer tube can be fully utilized, and the vertical restraint can be prevented. The flap 30 is in contact with the wall surface of the molten glass delivery tube. Further, in the case of using the glass stirring device of the present invention, it is preferred that the distance between the wall surface of the molten glass conveying pipe and the outer edge of the stirring portion 20 is fixed. In order to prevent the squeeze of the molten glass in the vicinity of the wall surface of the molten glass transfer pipe, it is preferably 0.85 x Dl SD2, more preferably 〇 9 x Ddh. The length 1 of the long side of the vertical agitating fin 30 is based on the relationship with the maximum diameter D2 of the outer edge of the agitating portion 20, and the length of the portion of the glass-glass mixing device 1 in the molten glass transfer tube. The amount of molten glass is appropriately selected. Furthermore, when viewed from the relationship of the maximum diameter 〇2 of the outer edge of the mixing section 20, 146724.doc 201038499, the length l of the long side of the longitudinal agitating fin 30 preferably satisfies 0'5xD2g Lg 3xD2, It is better to satisfy D2g 2 5xD2, and it is better to satisfy 1.2xD2$LS2xD2. The width w of the short side of the longitudinal agitating fin 3 is based on the relationship with the other components of the glass agitating device i, specifically, the largest straight edge of the outer edge of the agitating portion, and the diameter D3 of the center (four). Or the relationship between the length of the horizontal (four) fins, the viscosity of the molten glass to be conveyed, and the amount of conveyance, and the appropriate one is 'from the outside of the stirring unit 20.... one by one - 2 to the egg '丨; r, The width of the short side of the non-I (four) mixing wing > 130 is better than 〇〇 1XDdWS 〇 · 2% ' It is better to satisfy 0.05xD2sWm5x D2 ' and then it is better to satisfy 〇〇 7 χ = = (1). The outer end of the second degree is set to 4 degrees 1 of the ice of 20. The thickness of the mixing blade 30 is based on the relationship with the maximum diameter 与 of the agitating portion, and the other flank of the longitudinal agitating blade 30 = the length L and the width W of the longitudinally-cut piece 30, and the length is given. The local selection of materials, the viscosity of the molten glass to be transported, and the amount of conveyance are appropriate. Second, the maximum diameter A of the outer edge of the portion 20 is off. · 'The thickness of the wing 3°" is satisfied... and the cup 2' is better to satisfy 〇.〇3XDdG〇.2XD2, and it is good to satisfy 0·05χΓχίδ〇 Μ%. If the constituent materials are relative to the glass

..., 丨王, corrosion-resistant materials, A is particularly limited, A better. I46724.doc -J0· 201038499 is a turning or reducing alloy with excellent heat. Hey, in order to increase the strength, use a higher melting point! a is used as the material of 3, and the indium core seal is coated with a gas, and a material coated with a turn or an alloy of the first is also used. The same applies to the central axis 10 and the lateral feeding blade 40, which are other constituent elements of the glass mixing device.横 横 The horizontal agitating fins 40 including the plate-like body are located between the central shaft 10 and the longitudinal agitating fins 30. Regarding the lateral (four) fin 4G, the long side thereof is orthogonal to the central axis 1G, and the short side thereof is inclined toward the axial direction of the central axis 10. Hereinafter, in the present specification, in the both sides including the horizontal feeding flap 40 including the plate-like body, the side orthogonal to the central axis 10 is set to the side of the long side which is orthogonal to the long side. Short side. Therefore, by the shape of the cross-stitching flaps $# at .^ , ^ different moons, there is a case where the relationship between the long side and the short side of the appearance and the relationship of the $_g_j side-the edge of the present invention are reversed. Further, the short side of the horizontal agitating fin 40 is inclined toward the axial direction of the central axis 10 of the central axis 3, which is referred to as "the horizontal agitating blade is inclined toward the central axis". The horizontal agitating fins 40 are arranged to prevent the central shaft 10 side, particularly the central shaft 1 〇, from being squeezing through the longitudinal agitating fins and the outer slats 30, and are passed through the portion 20 The melting and breaking of the parts is the effect of increasing the retention time. In the case of the longitudinal agitating fins 30, the effect of the smelting glass on the side of the mandrel 10 is improved by the mixing of the wings. In the above two kinds of effects, the inclination angle α of 10 is 1 to 7 degrees, and is 40 to 50 degrees. The horizontal agitating fins 40 are preferably 30 degrees to 60 degrees with respect to the central axis, and more preferably between the broken glass feeding fins 30 shown in FIGS. 1 to 3, in the upper and lower directions. Four horizontal stirrings are provided at intervals between the central axis and the vertical agitation. 146724.doc 201038499 Wings 40' but in the glass (10) of the present invention, the horizontal axis of the TM wing is: I, for example, For the mandrel 10 and the vertical mixing fins 3, the horizontal agitating fins 40 may be provided with five pieces of the viewing fins 40.鈇 right right is placed between the center car 10 and the vertical feeding blade 30; the addition of 'corresponds to this' makes the stirring part 2 〇 rotate the torque required to increase the force" It is 8 pieces or less. Therefore, it is preferable that the number of the horizontal agitating fins provided between the center shaft and the longitudinal agitating fins 30 is i pieces to 8 pieces. In terms of torque increase, care must be taken not to make the horizontal agitation between the central shaft 10 and the longitudinal agitating fins 3〇; the spacing between the sheets 40 is too small. When focusing on the (4) portion of the figure and the side shape 'If there is a ratio of the 'void portion (ie, the portion where the cross-web 40 is not present) in the region surrounded by the central axis 1〇, the longitudinal search flap 3〇, and the support structures 3〇a, 3〇b If the number is small, the torque required for the rotation of the urging portion 2 is increased, which is not preferable. In terms of preventing the torque required to rotate the agitating portion 20, the area Si of the portion of the lateral agitating fin 40 is present. The area of the area surrounded by the central axis 1〇, the longitudinal agitation fins 3〇, and the support structures 30a, 30b (ie, there is a horizontal search flap) The ratio ((Si/(Si + S2))) of the area of 40 (the sum of the area of Si (s = ixh) and the area of the gap portion SJSfixj) is preferably 8 〇〇 / 〇 or less, more Preferably, it is 60% or less, and further preferably 2% to 6%. The length i of the horizontal feeding blade 40 is based on the size of the other components of the glass stirring device, specifically, the stirring portion 2〇 The relationship between the maximum diameter of the outer edge, the diameter A of the central axis 1〇, and the width of the longitudinal agitating fin 3〇 146724. doc 12 201038499 Appropriately selected. According to the above (S]/(Sl+S2)) The α, the viscosity of the molten glass to be conveyed, the height system of the horizontal agitating fins 40, and the inclination angle of the horizontal agitating fins 40 are appropriately selected.

The thickness of the horizontal agitating fins 40 is the length i and the height of the cross-fed flap 4G according to the cross-stitching fins, and the viscosity or transport of the (four) glass. Choose appropriately. When viewed from the relationship with the length 横 of the horizontal agitating fins 40, when the constituent material of the lateral agitating fins 40 is the above material, the thickness is preferably S0.4xi, more preferably 〇〇lxi$ thickness $ 〇 2xi, and then good is 〇·〇15χί$ thickness g〇.lxi. In the glass stirring apparatus 1 shown in FIG. 1 to FIG. 3, in order to increase the stirring action of the molten glass, the structure attached to the outer periphery of the center shaft 10 (the vertical feeding flap 30 and the horizontal stirring fin 40) is improved. The portion of the central shaft 10 that constitutes the agitating portion 20 is expanded in diameter for reasons such as support strength. However, if the diameter of the center shaft 1 变 becomes large, it is necessary to pay attention to the increase in the torque required to rotate the stirring portion 2 。. Further, when the diameter of the center shaft 1 变 is increased, the area surrounded by the center shaft 10, the vertical stirring fins 30, and the support structures 3A and 30b of Fig. 3 becomes small. In this region, the molten glass that is closer to the center axis 1〇 side by the longitudinal agitating fins 30 is stirred. Therefore, if the region becomes too small, the stirring action of the molten glass of the lateral agitating fins 40 is rather lowered. Poor. For the above reasons, the maximum diameter D2 (mm) of the outer edge of the agitating portion 20 and the diameter of the central axis 10 (more specifically, the vicinity of the end portion of the central agitating portion 146724.doc -13·201038499 2 中心 in the central axis 10 The diameter D3 (mm) is preferably 〇6χ〇2, more preferably D3S〇.5xd2, and further preferably DdO M%. However, if the diameter of the center shaft 10 is too small, the central axis is broken due to the stress at the time of rotation. From this point of view, when the constituent material of the center shaft 10 is the above material, it is preferable that the outer diameter D2 (mm) of the outer edge of the search portion 20 and the diameter of the central axis 10 (more specifically, the center (four) The diameter D3 of the vicinity of the lower end portion constituting the glass soaking portion 20 satisfies Am%. Patent Document 3 discloses a molten glass stirring blade including second plates 5 and 6 inclined at an angle in the axial direction of the rotating shaft 9, the flat plate 3, and the third plate 7, 8' and the square rotating shaft 9. Sheet 1 (refer to the figure of the present application. The molten glass stirring fin of the same document is a device for the purpose of stirring in a small-scale continuous furnace, and the mixing flow rate is small, that is, maintaining a certain degree in the dazzling tank. The second plate 5, 6 is inclined at an angle to the axis of the rotary shaft 9 so as to tilt the smelting glass I held in the dissolution tank toward the upper side of the chute. The glass stirring device of the present invention is disposed in a molten glass transfer of molten glass having a dPa s 7000 dPa.s at a transport amount of s S 50 m / hr · S (S is the cross-sectional area of the transfer tube). The inside of the tube is used, so that the mixing flap is prevented from being squeezed by the molten glass in the vicinity of the wall surface of the conveying pipe, and the fused glass in the vicinity of the wall surface of the glass conveying pipe is mixed (in the case of the patent document 3). In the second flat plate 5 and 6, the molten glass is pressed to the upper side. Further, the molten glass stirring fin of Patent Document 3 is preferably the outer edge position of the stirring portion (the width dimension shown in Fig. 2 of the same document is about 2/3 of the inner diameter of the melting tank). When the width dimension j is made larger than the above-described preferable range, the second flat plates 5 and 6 which are inclined toward the axial direction of the rotary shaft 9 are in contact with the inner wall of the dissolution tank. Therefore, Patent Document 3 In the molten glass stirring fin, it is not possible to prevent the molten glass in the vicinity of the wall surface of the molten glass transfer tube from being squeezed, and to obtain the stirring effect of the molten glass.

Next, the molten glass stirring method of the present invention will be described. (4) Method of the molten glass of the present invention As shown in Fig. 4, the glass stirring device of the present invention is placed in a molten glass transfer pipe for conveying molten glass, and the molten glass in the molten glass transfer pipe is stirred. The object to which the present invention is applied is not particularly limited, but is preferably applied to a transport amount of 1 m3/hour. S to 5 hr.s (s is the cross-sectional area of the transfer tube). The transport viscosity is H) 〇dPa .s ~ hired dPa.s molten glass solution transport tube. Moreover, the method of stirring the molten glass of the present invention is excellent in the uniformity of the molten glass after the stirring, and is preferably applied to the production of a glass substrate, an optical lens, an optical communication fiber, and the like for FPD. The requirements for uniformity are extremely strict in the case of a chopper, a substrate for a solar cell, and a fluorescent tube: stirring of molten glass to be performed in the process of using glass. In the method of (4) glass (4) of the present invention, the stirring condition of the molten glass is not particularly limited, and depending on the configuration of the glass stirring device used (the number of the feeding fins and the horizontal stirring fins, etc.) or the glass stirring device The size of each part 146724.doc -15- 201038499, the size of the molten glass transfer tube in which the glass stirring device is installed, and the conditions related to the molten glass conveyed in the molten glass transfer tube (viscosity of molten glass, conveyance amount, etc.) ) and choose as appropriate. Next, the sheet glass manufacturing apparatus of the present invention will be described. The minimum configuration is a glass melting apparatus including a glass melting apparatus that melts a glass raw material to become molten glass, and a sheet glass forming apparatus (for example, a forming apparatus of a floating method or a down-draw method) for forming molten glass. In addition, the molten glass transfer tube is provided between the glass melting apparatus and the sheet glass forming apparatus for the purpose of conveying the molten glass obtained by the glass melting apparatus to the sheet glass forming apparatus. The sheet glass manufacturing apparatus usually includes constituent elements other than the glass melting apparatus and the sheet glass forming apparatus. When an example of such other constituent elements is cited, there is a vacuum defoaming device for performing clarification of the molten glass. Further, in order to transport the molten glass between the constituent elements, the sheet glass manufacturing apparatus usually includes a plurality of molten glass transfer tubes. In the sheet glass manufacturing apparatus of the present invention, the glass stirring apparatus of the present invention described above is provided in any one or a plurality of the plurality of molten glass conveying tubes. In the sheet glass manufacturing apparatus of the present invention, the position of the glass stirring apparatus of the present invention is not particularly limited. Therefore, the glass stirring device of the present invention can be provided in any one of the molten glass conveying pipes constituting the sheet glass manufacturing apparatus. Further, the number of the glass stirring devices to be provided is not particularly limited. However, when the sheet glass manufacturing apparatus includes the decompression defoaming apparatus as a constituent element, at least one of the molten glass conveying pipe on the upstream side of the decompression defoaming device and the molten glass conveying pipe on the downstream side of the decompression defoaming device The glass stirring device of the present invention is preferably provided in the manufacture of a plate glass having a higher uniformity of 146724.doc -16 - 201038499, more preferably a molten glass conveying pipe on the upstream side of the dust removing and defoaming device. The glass stirring device of the present invention is provided on both sides of the molten glass conveying pipe on the downstream side of the vacuum defoaming device. Further, it is preferable to provide a torque converter to monitor the torque fluctuation of the rotation of the (four) fins, thereby making it possible to treat the deformation or breakage of the feed fin or the transfer tube. The sheet glass manufacturing apparatus of the present invention can be applied to sheet glass of various uses, but it is particularly preferable to manufacture sheet glass which is suitable for applications such as glass substrates which are required for uniformity. By using the sheet glass manufacturing apparatus of the present invention to produce sheet glass, it is possible to obtain a sheet which does not have an undissociated raw material, has high transparency, and has a high flatness. [Examples] In the following examples and comparative examples, a model test was carried out on the mixing action of the molten glass conveyed in the molten glass transfer tube (using a simulated molten glass / / / 4 is a schematic diagram of a molten glass transfer officer used in a model test, and is shown in a state in which the glass drop device 1 shown in FIGS. 1 to 3 is placed in a molten glass transfer pipe (however, since it is modematically It means γ and thus the shape does not necessarily coincide with FIG. 3). In the model test, the fluid moves in the arrow "1 direction in the figure. The size of the molten glass transfer tube shown in Figure 4 is as follows. Diameter (supervisor, branch is the same): 4〇mm Height from the lower surface of the main pipe to the upper surface of the branch pipe (left): 5〇inm Height from the lower surface of the main pipe to the upper surface of the branch pipe (right): 1〇〇 Lai 146724.doc -17. 201038499 Further, the conditions relating to the fluid transported in the molten glass transfer pipe are as follows. Viscosity: 400 dPa_s Transport amount: 30 m3/hr. S Example 1 3 The behavior of the fluid when the glass stirring device 1 of the present invention shown in Figs. 1 to 3 was inserted into the transfer tube and stirred was used. The dimensions of the various parts of the glass stirring device are as follows. The maximum diameter of the outer edge of the knife-feeding portion 20: 38 mm The diameter of the central shaft 10 (part of the agitating portion 20) 〇3: 1〇mm The length of the longitudinal agitating fin 30: 60 mm The longitudinal agitating blade 30 Width W: 3.8 mm Thickness of the longitudinal agitating fin 30 t: 3.8 mm Tilt angle of the rib feeding fin 40 relative to the central axis :: 6 〇 degree of the length of the agitating fin 40 i: 10.2 mm Height h of the sheet 40: 8 mm Thickness of the horizontal agitating fin 40: 2 mm The area S1 in which the portion of the lateral agitating fin 40 is present is in the center axis 1〇, the longitudinal agitating fin 30, and the support structures 30a, 3〇 The ratio of the area enclosed by b (i.e., the area where the portion of the horizontal agitating fin 4〇 is and the area of the gap portion S2) ((Si/(\ + S2))): 3〇 % The glass agitating device 1 is inserted until the lower end portion of the agitating portion 2 is at a height of 20 mm from the center of the branch pipe (left), and is rotated at a rotation number of 1 rpm. 146724.doc 201038499 Figure 8 is a graphical representation of the behavior of a fluid during agitation. As is apparent from Fig. 8, the glass stirring apparatus according to the present invention can effectively prevent the fluid from being squeezed near the wall surface of the molten glass transfer tube and around the central axis. As a result, the fluid simulating the molten glass is cut off under the action of agitation (symbol 100), and is gradually elongated (symbol 200) to flow downstream. Comparative Example 1 A glass stirring device ra shown in Fig. 5 was used. The glass agitating device 1'a shown in Fig. 5 is the same as the glass agitating device 1 of the embodiment except that the lateral agitating fins 4 are not present. Fig. 9 is a view schematically showing the behavior of a fluid during agitation. As can be seen from Fig. 9, according to the glass stirring device lia of the comparative example, the fluid in the vicinity of the wall surface of the conveying pipe can be prevented from being squeezed, but the fluid in the vicinity of the center of the conveying pipe (around the center axis of the stirring device) is generated. Squeezed over. As a result, the fluid simulating the molten glass flows out directly downstream without being cut. Comparative Example 2 The glass stirring device rb shown in Fig. 6 was used. The glass stirring crucible rb shown in Fig. 6 has the same shape as the molten glass stirring fin shown in Fig. 1 of Patent Document 3. The dimensions of the various portions of the glass stirring device rb shown in Fig. 6 are as follows. . • Center shaft 10, diameter: 10 mm. (4) Flap 3 (), (corresponding to the second plate of the publication) Length: 10 mm • Width of the feeding blade 30': 12.5 mm - Feeding fins 3〇, thickness: 3 mm The angle of inclination of the stirring fin 3〇' relative to the central axis 1〇': 45 degree agitating fin 40, (corresponding to the first paragraph of the publication! Flat plate, third plate) length 146724. Doc -19- 201038499 Degree: 7 mm Height of the 40's feeding fins: 3 mm Thickness of the 40's feeding flaps: 2mm Angle of the feeding flaps 40' relative to the central axis 1 〇 Angle: 45 degrees Figure 1 The lanthanide pattern schematically represents the behavior of the fluid during agitation. As can be seen from Fig. 1 , the glass stirring apparatus 1 and b of Comparative Example 2 have a stirring action of the fluid near the center of the conveying pipe (around the center axis of the stirring device), and the fluid simulating the molten glass is cut (symbol 100). And gradually elongated (symbol 2 〇〇), but it is impossible to prevent the fluid from being pushed near the wall surface of the conveying pipe. Comparative Example 3 The glass stirring device rc shown in Fig. 7 was used. The glass stirring apparatus 1'c shown in Fig. 7 and the diagram of Patent Document 1 are shown! The uniformizing device shown has the same shape, and the dimensions of the respective portions of the glass stirring device rc shown in Fig. 7 are as follows. . Center shaft 10, diameter: 10 mm agitating fins 30, (corresponding to the bulletin): length of the 60 mm agitating fins 12) (the longitudinal direction of the fins 30, the length (lateral): 19mm agitating fin 30, thickness: 3.8 mm 偁1 dry 4υ, length _ 17 6mm slanting member 40" thickness: 3.8 mm · 60-degree inclined member 40" tilt relative to the central axis 1〇 Length of the corner convex portion 50: 7 mm Height of the convex portion 50: 5 mm Further, the inclined member 40, and the fourth and fourth sides but the long axis is opposite to the t-axis 1 Ο, and the inclination is 146724.doc -20- 201038499 The short axis is not inclined with respect to the central axis. Fig. 11 is a view schematically showing the behavior of the fluid during agitation. It can be seen from Fig. u that (4) the surface agitating device of Comparative Example 3 is slightly prevented. The flow of fluid near the wall of the transfer pipe is 'but the periphery of the center axis of the device near the center of the transfer pipe.' The effect of the limbs is poor. As a result, the fluid simulating the molten glass is cut (symbol, V, 100), but does not elongate and flows directly downstream (symbol 300). ❹

Example 2 As an example of the production of sheet glass, a board was produced using a sheet glass manufacturing apparatus including a glass refining apparatus, an i-th molten glass conveying pipe, a vacuum defoaming device, a second molten glass conveying pipe, and a float forming apparatus. glass. The glass stirring device 1 of the present invention shown in Figs. 3 to 3 is provided in the first working and second molten glass conveying pipes. The molten glass raw material is heated by a glass dissolving device to obtain a molten glass. The molten glass is formed into a plate glass by the first molten glass transfer pipe, the reduced pressure defoaming device, the second molten glass transfer pipe, and the float molding apparatus in the following order. In the process of transporting the molten glass by the first and second smelting glass transfer pipes, the glass stirrer of the present invention is stirred to obtain uniformity, no mixing of unmelted raw materials, and high transparency and flatness. Higher plate glass. The present invention has been described in detail with reference to the specific embodiments thereof, and it is understood that those skilled in the art will be able to change various changes or modifications without departing from the spirit and scope of the invention. This application is based on the application of the patent application filed on February 27, 2009 (Japanese Patent No. 146724.doc -21 - 201038499, the patent pending 2009-047224), and the content of this patent is bitten by the bite. This application is incorporated by reference. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a part of a glass stirring device of the present invention. Figure 2 is a plan view of the glass stirring apparatus shown in Figure 1. Figure 3 is a side elevational view of the glass stirring apparatus of Figure 1. Fig. 4 is a schematic view showing a molten glass transfer pipe used in the first embodiment. Fig. 5 is a side view of the glass stirring apparatus of Comparative Example 1. Fig. 6 is a perspective view of the glass stirring apparatus of Comparative Example 2. Figure 7 is a side view of the glass stirring apparatus of Comparative Example 3. Fig. 8 is a schematic view showing the behavior of the fluid in the molten glass transfer pipe in the first embodiment. Fig. 9 is a schematic view showing the behavior of a fluid in a molten glass transfer pipe in Comparative Example 1. Fig. 1 is a schematic view showing the behavior of the fluid in the molten glass transfer tube of Comparative Example 2. Fig. 11 is a schematic view showing the behavior of the fluid in the molten glass transfer tube in Comparative Example 3. [Description of main component symbols] Glass agitator central shaft glass agitating section longitudinal agitating fin support structure 1, l'a, l'b, l, c 10, 1〇, 20 30 3〇a, 30b 146724.doc 22- 201038499 30' ' 30" ' 40' 40 40" 50 100 agitating blade cross agitating blade tilting member convex conveying tube

146724.doc -23-

Claims (1)

201038499 VII. Patent application scope: 1- A molten glass stirring device is used to transport the viscosity of the transporting capacity of 1 m3/hr.S~5〇m3/hr.S (S is the cross-sectional area of the conveying pipe) (9) a molten glass transfer tube of molten glass of dPa's to 7000 dPa.s; the molten glass stirring device includes: a rotatable central shaft; and a disturbing portion 'which is disposed on the central axis; The glass agitating portion is composed of a horizontal agitating fin and a longitudinal agitating fin each including a plate-like body, wherein the lateral side of the horizontal agitating fin is orthogonal to the central axis and the short side is inclined toward the axis of the central axis. In the case where the length of the vertical agitation blade is parallel to the central axis, the longitudinal side of the vertical agitating blade is provided at a position defining the outer edge of the agitating portion, and the molten glass is provided at a portion where the agitating portion is provided. When the diameter of the transfer pipe is DKmm) and the maximum diameter of the outer edge of the agitating portion is D2 (mm), it satisfies: 〇.8xDi$ D2$ 0.98)^. 2. The molten glass stirring apparatus of claim 1, wherein: when the diameter of the central axis is set to D3 (mm), it satisfies: . D3 $ 0.6 >< D2. 3. A glass plate manufacturing apparatus comprising: a glass refining device, a plate glass forming device, and a molten glass conveying pipe provided between the glass melting device and the plate glass forming device; and conveying the molten glass At least one molten glass stirring device as claimed in claim 1 146724.doc 201038499 or 2 is provided in the tube. 4. The plate glass manufacturing apparatus of claim 3, further comprising: a vacuum defoaming device disposed between the glass melting device and the plate glass forming device; the smelting glass conveying pipe comprising: first melting a glass transfer pipe provided between the glass melting device and the vacuum defoaming device; and a second molten glass transfer pipe provided between the vacuum defoaming device and the plate glass forming device; At least one of the molten glass stirring devices is provided in at least one of the first and second molten glass conveying pipes. 5. A method of agitating a molten glass using a molten glass stirring apparatus as claimed in claim 2 or 2. A method of manufacturing a sheet glass using the sheet glass manufacturing apparatus of claim 3 or 4. 146724.doc