JPH0355416B2 - - Google Patents

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Application Field) The present invention relates to a molten glass that simultaneously separates and removes glass in the top and bottom layers of the molten glass by a stationary skimmer in a fore-furnace of a glass melting furnace. The present invention relates to a device for separating and removing a top and bottom layer.

(Prior Art) Conventionally, a plurality of components are used in glass melting, but some of these components are volatile, and at the temperature that the molten glass reaches while flowing in the forehearth, the volatile components or A part of it is lost, and the surface layer of molten glass (hereinafter referred to as surface glass)
remains, for example, rich in silica. Also,
When molten glass comes into contact with a refractory, components eluted from the refractory enter the molten glass, and the bottom layer of the molten glass flowing near the bottom of the furnace (hereinafter referred to as bottom glass) remains in a state rich in alumina, for example. . Therefore, the top glass and the bottom glass do not have the same final composition as the intermediate layer of molten glass flowing in the forehearth. Such top glass and bottom glass have properties that differ from those of the base or intermediate layer glass, creating problems in molding and final products.

As a surface glass removal device in the forehearth,
There is a device for separating and removing the surface portion of molten glass disclosed in Japanese Patent Publication No. 54-39403, and a device for removing glass from the bottom is generally known to have a structure in which a glass discharge hole is provided at the bottom of the furnace. .

(Problems to be Solved by the Invention) However, conventional removal devices remove only either the front glass or the bottom glass independently, and are not devices that separate and remove both glasses at the same location at the same time. Separation of the top and bottom glass from the remainder of the molten glass, i.e. the base glass, is often highly unsatisfactory, and conventional equipment cannot be installed near the forehearth outlet, resulting in the final composition of the base glass. It was difficult to reliably supply supplies.

The present invention was made in consideration of the above circumstances, and
By temporarily blocking the flow of the surface glass and bottom glass of the molten glass flowing in the forehearth to separate them from the main body of the molten glass, and quickly removing this separated glass to the outside of the forehearth, the final composition can be improved. It is an object of the present invention to provide a device for separating and removing a top and bottom layer of molten glass, which can supply only a base glass having a base glass.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides stationary skimmers in two stages, upper and lower, across the forehearth in order to simultaneously separate the surface glass and the bottom glass from the main body of molten glass flowing in the forehearth. It is something. That is, a first stationary skimmer having an upper member protruding upward from the surface of the molten glass and an upper member extending in a shelf shape from the lower end of the upper member to the upstream side below the surface of the molten glass;
a second stationary skimmer having a lower member projecting upward from the hearth bottom and a lower surface member extending in the form of a shelf from the upper end of the lower member toward the upstream side; a first stationary skimmer; and a second stationary skimmer. a molten glass top and bottom layer having an intermediate molten glass passage for removing the top and bottom glasses separated by the first and second stationary skimmers to the outside of the forehearth; This is a separation and removal device.

(Function) When the molten glass flowing in the forehearth reaches the position of the stationary skimmer, the surface glass flowing above the upper member of the first stationary skimmer is diverted to the outside of the forehearth along the upper member, It is removed from the outlet provided in the furnace side wall. Further, the bottom glass that has flowed below the lower member of the second stationary skimmer is removed from the furnace through a discharge hole bored in the furnace bottom near the lower member. The remainder of the top and bottom glasses separated and removed, ie the molten glass intermediate between the top and bottom members, flows towards the outlet end of the forehearth through a passage provided at the stationary skimmer. As described above, according to the present apparatus, it is possible to simultaneously separate and remove the front glass and the bottom glass having a composition different from the final composition, and provide only the intermediate layer molten glass having the final composition.

(Example) The details of the invention will be explained with reference to the illustrated embodiments.

In FIGS. 1 to 3, stationary skimmers are provided in two stages, upper and lower, across the forehearth 1 to obstruct the flow of molten glass flowing inside the forehearth 1 of the glass melting furnace. The stationary skimmer 2 consists of an upper member 4 that projects upward from the surface of the molten glass as indicated by a dotted line 3, and an upper member 5 that extends in the shape of a shelf from the lower end of the upper member 4 to the upstream side below the surface of the molten glass. Second stationary skimmer 6 in the lower row
consists of a lower member 7 projecting upward from the hearth bottom and a lower surface member 8 extending in the form of a shelf from the upper end of the lower member 7 toward the upstream side. One end or both ends of the upper member 4 extend to the outside through the side wall of the forehearth, and a discharge port 9 is formed therein for removing the surface glass above the upper member 5 to the outside. Lower member 7
A discharge hole 10 for removing the bottom glass below the bottom member 8 to the outside is bored in the bottom of the furnace nearby. An upper surface member 5 and a lower surface member 8 are located between the first stationary skimmer 2 and the second stationary skimmer 6.
A passage 11 for molten glass is formed by the molten glass.

In the apparatus for separating and removing the top and bottom layers of molten glass configured in this manner, the surface glass that has flowed above the top member 5 as the molten glass flows is removed from the first layer.
The flow is directed approximately along the upper member 4 as indicated by the arrow in the figure.
It is turned 90 degrees and removed to the outside through the outlet 9.
In addition, the flow of the bottom glass flowing below the bottom member 8 is blocked by the bottom member 7, and the flow of the bottom glass is blocked by the bottom member 7.
removed from the outside. The remaining molten glass after separating and removing the front glass and bottom glass is transferred to the second
It heads toward the outlet end of the forehearth 1 through a passage 11 as indicated by the arrow in the figure.

FIG. 4 shows another embodiment of the present invention, in which a second stationary skimmer 6 installed in parallel with the first stationary skimmer 2 is provided at a position lower than the intermediate layer of molten glass. The feature is that the flow is smooth, and it is effective when the forehearth structure is shallow.

FIG. 5 shows an embodiment of the present invention installed near the outlet of the forehearth. Since the surface glass and bottom glass are removed just before the outlet 12, the chance of contamination with other components is minimized. A glass of final composition can be provided.

[Effects of the Invention] As described above, the present invention provides a method for forming a top and bottom surface layer of molten glass, which is provided with a stationary skimmer that simultaneously separates and removes the surface glass and bottom glass from the main body of the molten glass flowing in the fore-furnace of a glass melting furnace. This separation/removal device can easily and accurately separate and remove the front glass and the bottom glass to provide glass of the final composition. Moreover, if this device is installed near the outlet of the forehearth, there is an advantage that the chance of contamination of defective components into the molten glass is minimized, and glass of the final composition can be reliably provided.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, FIG. 3 is a perspective view showing an example of the stationary skimmer of the present invention, and FIG. FIG. 5 is a vertical cross-sectional perspective view showing another embodiment of the invention. FIG. 5 is a vertical cross-sectional perspective view showing an embodiment of the present invention provided near the outlet of the forehearth. 1...Forehearth, 2...First stationary skimmer, 4...
...Upper member, 5...Upper member, 6...Second stationary skimmer, 7...Lower member, 8...Lower member, 1
1...Aisle.

Claims (1)

[Claims] 1. In order to separate the top and bottom layer of glass from the main body of molten glass flowing in the fore-furnace of the glass melting furnace,
In an apparatus for separating and removing the top and bottom surfaces of molten glass, which includes a stationary skimmer extending across a forehearth, an upper member protrudes upward from the surface of the molten glass, and an upper member that is below the surface of the molten glass and upstream from the lower end of the upper member. a first stationary skimmer having an upper surface member extending sideward in the shape of a shelf; a second stationary skimmer having a lower member projecting upwardly from the hearth bottom; and a lower surface member extending in the shape of a shelf from the upper end of the lower member toward the upstream side; stationary skimmer and the first
a molten glass passageway provided between a stationary skimmer and a second stationary skimmer; A device for separating and removing a top and bottom layer of molten glass.