JPS62297221A - Device for separating and removing surface and back face layers of molten glass - Google Patents

Abstract

PURPOSE:The titled device capable of separating and removing surface glass and back glass readily and properly and of providing glass having final composition, by setting a top and bottom two-stage skimmers crossing a front furnace. CONSTITUTION:Static skimmers 2 and 6 are set at top and bottom stages. Surface glass which has flown to the upper part of a top member 5 with flow of molten glass turns its flow along an upper member 4 by about 90 deg. and is released through a discharge hole 9 to the outside. The flow of surface glass which has flown to the lower part of a bottom member 8 is prevented by a lower member 7 and released from a discharge hole outlet 10 to the outside. The residue after separation and removal of the surface glass and back glass is sent through a passageway 11 to the outlet end of a front furnace 1 as shown by the arrow. Consequently the surface glass and the back glass are separated and removed readily and properly and glass having a final composition can be provided.

Description

Detailed Description of the Invention 3. #MJJ Description of the Invention [Object of the Invention] (Industrial Field of Application) The present invention is a method of removing glass from the top and bottom layers of molten glass using a static skimmer in the fore-furnace of a glass melting furnace. The present invention relates to a device for separating and removing molten glass top and bottom layers at the same time.

(Prior art) Conventionally, multiple components are used in glass melting. The surface layer of the molten glass (hereinafter referred to as surface glass) remains enriched with, for example, silica. In addition, when molten glass comes into contact with a large object, components eluted from the refractory enter the molten glass, and the lower layer of the molten glass (hereinafter referred to as bottom glass) flowing near the bottom of the furnace becomes rich in alumina, for example. It remains in that state.

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 device for removing surface glass in a forehearth,
There is an apparatus for separating and removing a surface portion of molten glass disclosed in Japanese Patent No. 4-39403, and a generally known apparatus for removing glass from the bottom has 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-mentioned circumstances, and it temporarily blocks the flow of the surface glass and the bottom glass of the molten glass flowing in the forehearth, separates it from the main body of the molten glass, and quickly removes the separated glass. 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 final composition, rather than removing it to the outside of a forehearth.

[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. That is, the first stationary skimmer has an upper member that protrudes upward from the surface of the molten glass, an upper surface member that extends in a shelf-like manner below the surface of the molten glass and upstream from the lower end of the upper member; The protruding lower member and this lower ilJ
! A second stationary skimmer having a lower surface member extending in the form of a shelf from the upper end of one member to the upstream side, and a molten glass passage provided between the first stationary skimmer and the second stationary skimmer. This is a molten glass front and bottom layer separation and removal device that removes the top glass and bottom glass separated by the first and second stationary skimmers to the outside of the forehearth.

(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 turned to the outside of the forehearth along the upper member. , 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 Figures 1 to 3, the front furnace (1) of the glass melting furnace
The fore-furnace (1) is arranged so as to obstruct the flow of molten glass flowing inside.
Stationary skimmers are installed in two stages above and below across the
The first stationary skimmer (2) in the upper stage has an upper member (4) projecting upward from the surface of the molten glass as indicated by the dotted line (3).
and an upper surface member (5) extending in the form of a shelf from the lower end of the upper member (4) to the upstream side below the surface of the molten glass. It consists of a lower member (7) projecting upward and a lower surface member (8) extending like a shelf from the upper end of the lower member (7) toward the upstream side. The - side end or both ends of the upper member (4) extend to the outside through the side wall of the forehearth, and form an outlet (9) for removing the surface glass above the upper member (5) to the outside. has been done. At the hearth bottom near the lower member (7), there is a lower member (
8) A discharge hole αC is provided below for removing the bottom glass to the outside. First stationary skimmer (2)
and the second stationary skimmer (6), there is a top member (
5) and the lower IjiJ member (8) form a molten glass passage αυ.

In the device for separating and removing the top and bottom layers of molten glass configured in this way, as the molten glass flows, the top member (5)
The surface glass that has flowed upward turns its flow approximately 90 degrees along the upper member (4) as indicated by the arrow in FIG. 1, and is removed to the outside through the outlet (9).

Further, the flow of the bottom glass flowing below the bottom member (8) is blocked by the bottom member (7)K, and is removed to the outside through the discharge hole αG. The remaining molten glass from which the front glass and bottom glass have been separated and removed passes through the passage a11 as indicated by the arrow in FIG. 2 and heads toward the outlet end of the forehearth (1).

FIG. 4 shows another embodiment of the present invention.
The forehearth structure is characterized by the fact that a second stationary skimmer (6) installed in parallel with the stationary skimmer (2) is installed at a lower position to smooth the flow of the intermediate layer of molten glass. This is effective when the area is shallow.

FIG. 5 shows an embodiment of the present invention installed near the outlet of the forehearth. Since the surface glass and the bottom glass are removed just before the outlet 0, the chances of contamination with other components are minimized, and A glass of final composition can be provided.

〔Effect of the invention〕

As described above, the present invention is a molten glass top and bottom surface layer separation and removal apparatus that 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 forefurnace of a glass melting furnace. In addition, the front glass and the bottom glass can be easily and accurately separated and removed to provide a glass of the final composition. Further, 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 to a minimum, and glass of the final composition can be reliably provided.

[Brief explanation of the drawing]

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.

Claims (1)

[Claims] In order to separate the top and bottom layer of glass from the main body of the molten glass flowing in the forehearth of a glass melting furnace, a molten glass top and bottom surface separation and removal device is provided with a stationary skimmer extending across the forehearth. A first member having an upper member projecting upward from the surface of the 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 upstream from the upper end of the lower member in the form of a shelf; a molten glass passage provided between the first and second stationary skimmers, and the molten glass in the top and bottom layers separated by the first and second stationary skimmers is removed to the outside of the forehearth. Equipment for separating and removing the top and bottom layers of molten glass.