JP2007284347A - Molten glass supplying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a supplying device continuously molding a molten glass under a stable state of dimension without changing a flow rate even when a temperature of a molding vessel is changed. <P>SOLUTION: In the supplying device, a first vessel 2 having an outflow pipe 2a at a bottom part and soaking an overall molten glass 1 at a temperature higher by a specified temperature than a molding temperature and a second vessel 6 disposed successively at a molding vessel 3 and having an insertion port 6a are arranged so as to insert a lower end part 2b of the outflow pipe 2a to the insertion port 6a of the second vessel 6, and the lower end part 2b of the outflow pipe 2a is disposed in an immersion state under a liquid surface 1a of the molten glass 1 in the second vessel 6 during the operation of the supplying device. The molten glass 1 supplied to the molding vessel 3 from the second vessel 6 and prepared at a molding temperature is drawn out from a nearly rectangular glass drawing port 4 by a pair of rollers (not shown by figure) and the glass plate 5 having a desired dimension is continuously molded. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a molten glass supply device for continuously forming plate glass from molten glass.

  In general, when forming glass articles continuously, for example, when manufacturing thin plate glass, the glass raw material is heated in a glass melting kiln and melted in the molten glass, the molten glass is clarified, and sufficiently stirred to form. After lowering the temperature to near the suitable temperature, as shown in FIG. 3, the molten glass 1 is soaked to a temperature suitable for molding in the first tank 2 having the outflow pipe 2a at the bottom. Then, it is supplied to the molding tank 3 through the outflow pipe 2a. In the forming tank 3, the molten glass 1 adjusted to the forming temperature is drawn out from the substantially rectangular glass outlet 4 to continuously form the plate glass 5.

In the conventional molten glass supply device, the molten glass 1 in the first tank 2 is directly supplied to the forming tank 3 through the outflow pipe 2a (see, for example, Patent Document 1).
JP-A-63-190722

  However, when the temperature of the forming tank 3 is increased or decreased in order to adjust the thickness or the like of the plate glass 5, the temperature of the molten glass 1 supplied from the outflow pipe 2a is changed accordingly, and the glass outlet is changed. Since the flow rate of the molten glass 1 drawn from 4 changes, the entire cross-sectional dimension of the plate glass 5 changes and the size of the plate glass 5 deviates from the non-defective range. If the set temperature of the molten glass 1 in the first tank 2 or the outflow pipe 2a is changed in order to correct the flow rate change, a good plate glass 5 cannot be obtained for a while until the flow rate becomes a steady state. There is.

  The objective of this invention is providing the supply apparatus of the molten glass which solved said problem.

  The apparatus for supplying molten glass according to the present invention has an outflow pipe at the bottom, and is continuously provided in a first tank for soaking the molten glass after clarification and stirring to a predetermined temperature, and a lower forming tank And a lower end of the outflow pipe of the first tank is disposed in a dipped state below the liquid level of the molten glass in the second tank, and the plate glass continuously from the forming tank. It is characterized by being molded.

  Further, in the molten glass supply device according to the present invention, the first tank, the outflow pipe, the second tank, and the molding tank have independent heating means and temperature sensors, respectively, and are connected to each temperature sensor and internally formed by each heating means. And a temperature controller capable of automatically controlling the temperature of the molten glass independently of each other.

  The molten glass supply device according to the present invention is characterized in that the lower end portion of the outflow pipe of the first tank is inserted into the insertion port of the second tank.

  The molten glass supply device according to the present invention is characterized in that the molten glass is soaked in the vicinity of a temperature suitable for molding in the first tank.

The molten glass supply apparatus according to the present invention is characterized in that the viscosity of the molten glass after clarification and stirring is 10 ⁴ to 10 ⁵ poise.

  In the molten glass supply apparatus according to the present invention, the molding tank is a tank having a substantially rectangular glass outlet.

  In the molten glass supply apparatus according to the present invention, the molding tank is a substantially wedge-shaped molded body having an overflow groove formed in an upper portion thereof.

  In the molten glass supply apparatus according to the present invention, the molten glass after clarification and stirring is soaked to a predetermined temperature in a first tank having an outflow pipe at the bottom, and then the molten glass is discharged from the outflow pipe of the first tank. When the molten glass is supplied to the second tank connected to the molding tank, the molten glass is continuously poured in a state where the lower end portion of the outflow pipe of the first tank is immersed below the liquid surface of the molten glass in the second tank. Next, a method is adopted in which molten glass is supplied from the second tank to the forming tank and the glass sheet is continuously formed.

  In the above configuration, the flow rate of the molten glass flowing down the outflow pipe at the bottom of the first tank is the height from the liquid level of the molten glass in the first tank to the liquid level of the molten glass in the second tank, that is, the head. It is determined by the high and the viscosity linked to the temperature of the molten glass flowing down in the outflow pipe. In the present invention, the temperature of the forming tank is obtained by interposing a second tank in which the liquid level of the molten glass is generated by separating the outflow pipe and the forming tank so that the flow rate of the molten glass flowing down in the outflow pipe is constant. It is important to keep the temperature of the molten glass flowing down the outflow pipe constant even when the temperature is changed. Moreover, it is preferable to make small the heat transfer area of an outflow pipe and a 2nd tank, when maintaining the temperature of the molten glass in an outflow pipe constant.

  The present invention is practically superior in that the molten glass flow rate does not change even when the temperature of the molding tank is changed, and the molten glass can be continuously formed in a stable dimension due to the configuration as described above. It is effective.

  According to the present invention, the molten glass supply device has a first tank that has an outflow pipe at the bottom and soaks the molten glass at a predetermined temperature, and a second tank that is connected to the lower forming tank. The lower end of the outflow pipe of the first tank is disposed so as to be immersed under the liquid surface of the molten glass in the second tank, and the molten glass is soaked to a predetermined temperature in the first tank, and then the first tank When the molten glass is supplied from the outflow pipe to the second tank, the molten glass is continuously supplied with the lower end of the outflow pipe of the first tank being immersed under the liquid surface of the molten glass in the second tank. Therefore, when the temperature of the molding tank is raised, the flow rate of the molten glass to be molded temporarily increases, the liquid level of the molten glass in the second tank is lowered, and thereby the flow rate of the molten glass to be molded Decreases to offset the increase in flow rate. On the other hand, when the temperature of the molding tank is lowered, the flow rate of the molten glass to be molded is temporarily reduced, and the liquid level of the molten glass in the second tank is increased, thereby the flow rate of the molten glass to be molded. Increases to offset the decrease in flow rate. Thus, the flow rate of the molten glass can be kept constant even if the temperature of the molding tank is changed.

  In the molten glass supply apparatus of the present invention, the first tank, the outflow pipe, the second tank, and the molding tank each have independent heating means and temperature sensors, and are connected to each temperature sensor and are internally connected by each heating means. The temperature of the molten glass can be controlled automatically and independently, so even if the temperature of the molding tank is changed, the temperature of the first tank, outflow pipe and second tank can be controlled independently. By automatically controlling and maintaining the temperature of the molten glass in each tank, that is, the viscosity, the flow rate of the molten glass can be further stabilized.

  An explanatory diagram of an embodiment of the present invention is shown in FIG. In the figure, 1 is a molten glass, 2 is a first tank, 2a is an outflow pipe connected to the bottom of the first tank 2, 3 is a forming tank, 4 is a substantially rectangular glass outlet, Reference numeral 6 denotes a second tank, 7 denotes a heating element as a heating means, 8 denotes a thermocouple as a temperature sensor, and the same parts as those shown in FIG. ing.

  First, an example of the molten glass supply apparatus according to the present invention will be described.

  As shown in FIG. 1, the supply device of the present invention has a first tank 2 having an outflow pipe 2a at the bottom, and soaking the entire molten glass 1 to a temperature higher than the molding temperature by a predetermined temperature, and a molding tank. 3 and the second tank 6 having the insertion port 6a are arranged such that the lower end 2b of the outflow pipe 2a is inserted into the insertion port 6a of the second tank 6, and the second tank 6 is in operation when the supply device is in operation. The lower end 2b of the outflow pipe 2a is immersed under the liquid surface 1a of the molten glass 1 in the two tanks 6. The molten glass 1 supplied from the second tank 6 to the molding tank 3 and adjusted to the molding temperature is drawn out from a substantially rectangular glass outlet 4 by a pair of rollers (not shown), and a plate glass 5 having a desired size and shape. Is formed continuously.

  The first tank 2, the outflow pipe 2 a, the second tank 6, and the molding tank 3 have independent heating elements 7 and thermocouples 8, and are connected to each thermocouple 8 and melted inside by each heating element 7. A temperature controller (not shown) capable of automatically controlling the temperature of the glass 1 independently is provided.

  Next, an example of the molten glass supply method according to the present invention will be described.

In the supply method of the present invention, first, a glass raw material is heated to about 1600 ° C. or higher by a glass melting kiln (not shown), melted in the molten glass, the molten glass is clarified to remove bubbles, foreign matters, etc. Is sufficiently agitated to eliminate striae, and the temperature is lowered to around the temperature at which the viscosity of the molten glass is in the range of 10 ⁴ to 10 ⁵ poise, for example, around 1200 ° C. As shown in FIG. 1, the molten glass having a predetermined temperature is supplied to the first tank 2 provided with the outflow pipe 2a, so that the entire molten glass 1 is soaked, and then into the second tank 6 through the outflow pipe 2a. When supplying the molten glass 1, the lower end 2 b of the outflow pipe 2 a is supplied in a state of being immersed under the liquid surface 1 a of the molten glass 1. The molten glass 1 supplied from the second tank 6 into the molding tank 3 is adjusted to a molding temperature at which the viscosity is about 10 ⁵ poise suitable for molding, for example, 1150 ° C., and the molten glass 1 reaches the molding temperature. Are drawn continuously from the substantially rectangular glass outlet 4 by a pulling means such as a roller pair (not shown) to form a plate glass 5 having a desired size and shape.

  The temperature of the substantially rectangular glass outlet 4 opened at the bottom of the forming tank 3 in order to adjust the cross-sectional shape, warpage, etc. of the plate glass 5 when the plate glass 5 is continuously formed by the above-mentioned supply device. When, for example, the temperature is changed by 5 ° C., the change in the cross-sectional area of the plate glass 5 is within 0.5%, and the plate glass 5 does not deviate from the quality standards for thickness.

  On the other hand, when the temperature of the glass outlet 4 of the molding tank 3 is changed by 5 ° C. with a conventional molten glass supply device, the flow rate of the molten glass changes and the change in the cross-sectional area of the plate glass 5 is about 3.5%. The plate glass 5 deviated from the standard for thick products. Therefore, the change in flow rate was corrected by changing the set temperature of the molten glass 1 in the first tank 2 and the outflow pipe 2a, but it took about 90 minutes for the flow rate to reach a steady state, and the plate glass 5 in the meantime was all I became a caret.

  Further, the present invention is not limited to the molding in which the molten glass 1 is directly drawn out from the glass outlet 4, but as shown in FIG. 1, the molten glass 1 is allowed to overflow from both sides of the overflow groove 9 a, and the side wall surfaces 9 b on both sides of the molded body 9 are caused to flow down and cooled to the molding temperature. It is also applicable to an overflow method in which a single sheet glass 5 is continuously formed by fusing. In this case, the molten glass 1 is supplied to the first tank 2 having the outflow pipe 2a at the bottom, soaked at a temperature suitable for molding, and then the second tank 6 connected to the overflow groove 9a of the molded body 9 below. When the molten glass 1 is supplied, the lower end 2b of the outflow pipe 2a of the first tank 2 is continuously supplied with the molten glass 1 being immersed under the liquid surface 1a of the molten glass 1 in the second tank 6. To do.

  The apparatus for supplying molten glass of the present invention is suitable for continuously forming plate glass from molten glass.

It is explanatory drawing of the supply apparatus of the molten glass which concerns on this invention. It is explanatory drawing of the supply apparatus of the other molten glass which concerns on this invention. It is explanatory drawing of the supply apparatus of the molten glass by a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Molten glass 1a Liquid level 2 1st tank 2a Outflow pipe 2b Lower end part 3 Molding tank 4 Glass outlet 5 Sheet glass 6 Second tank 6a Insertion port 7 Heating body 8 Thermocouple 9 Molded body

Claims (7)

  The first tank has an outflow pipe at the bottom, clarifies and agitates the molten glass after stirring to a predetermined temperature, and has a second tank connected to the lower forming tank. The lower end portion of the outflow pipe of one tank is disposed in a dipped state below the liquid surface of the molten glass in the second tank, and the glass sheet is continuously formed from the forming tank. Feeding device.   The first tank, the outflow pipe, the second tank, and the molding tank have independent heating means and temperature sensors, and are connected to each temperature sensor and automatically control the temperature of the molten glass inside by each heating means. The apparatus for supplying molten glass according to claim 1, further comprising a temperature controller that can be used.   The apparatus for supplying molten glass according to claim 1 or 2, wherein a lower end portion of the outflow pipe of the first tank is inserted into an insertion port of the second tank.   The apparatus for supplying molten glass according to any one of claims 1 to 3, wherein the molten glass is soaked in the first tank at a temperature suitable for molding. The molten glass supply apparatus according to any one of claims 1 to 4, wherein the viscosity of the molten glass after clarification and stirring is 10 ⁴ to 10 ⁵ poise.   The apparatus for supplying molten glass according to any one of claims 1 to 5, wherein the forming tank is a tank having a substantially rectangular glass outlet.   The molten glass supply apparatus according to claim 1, wherein the forming tank is a substantially wedge-shaped formed body having an overflow groove formed in an upper portion thereof.

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