JP6187281B2 - Tube glass manufacturing apparatus and tube glass manufacturing method - Google Patents

Description

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

  2. Description of the Related Art Generally, a glass manufacturing apparatus that includes a muffle furnace and a sleeve disposed in the muffle furnace, arranges the tip of the sleeve downward, and draws molten glass supplied onto the sleeve from the tip of the sleeve has become known. (See Patent Document 1). The muffle furnace has a glass outlet through which molten glass is drawn, and a muffle door for adjusting the atmospheric temperature in the muffle furnace is provided at the glass outlet.

JP-A-48-93610

As shown in Patent Document 1, the lower surface of a conventional muffle door is formed parallel to the ground. In addition, the air in the muffle furnace contains a boric acid component volatilized from the molten glass, and the volatilized boric acid component is cooled at the boundary with the outside air to provide a muffle door provided above the outlet of the muffle furnace. May adhere to condensation.
The liquid containing the boric acid component adhering to the muffle door collects on the lower surface of the muffle door by gravity and falls. At this time, since the lower surface of the muffle door is provided in parallel to the ground, there is a possibility that the liquid containing the boric acid component will fall evenly from the entire lower surface. When a liquid containing a boric acid component is dropped onto an annularly formed glass passing under the muffle door, the quality of the glass is deteriorated.

  Then, in view of the subject which concerns, this invention provides the tube glass manufacturing apparatus which can prevent that the liquid containing the impurity adhering to the muffle door falls to glass, and can stabilize the quality of glass.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, the tube glass manufacturing apparatus according to claim 1 includes a muffle furnace and a sleeve disposed in the muffle furnace, and the tube glass manufacture that draws molten glass supplied onto the sleeve from the tip of the sleeve. The muffle furnace includes a tube glass outlet for drawing out the tube glass and a muffle door installed at the tube glass outlet, and the muffle door includes an inclined surface above the tube glass. It is characterized by that.

  The tube glass manufacturing apparatus according to a second aspect is characterized in that a liquid fall prevention member protruding from the inside of the muffle furnace is provided at least on the side surface inside the muffle furnace of the muffle door and immediately above the tube glass.

On the other hand, the manufacturing method of the tube glass which concerns on Claim 3 manufactures a tube glass with the manufacturing apparatus of the tube glass of Claim 1 or Claim 2, It is characterized by the above-mentioned.

  As effects of the present invention, the following effects can be obtained.

  That is, according to the tube glass manufacturing apparatus according to the first aspect, since the liquid attached to the muffle door moves from above the tube glass, it can be prevented from falling onto the tube glass.

    According to the tube glass manufacturing apparatus according to claim 2, the liquid adhering to the muffle door is guided from the upper part of the tube glass to the other place by the fall prevention member, so that it can be prevented from falling on the tube glass. .

  According to the method for manufacturing the tube glass according to the third aspect, the tube glass can be manufactured while preventing the liquid adhering to the muffle door from falling on the tube glass.

The side view which shows the tube glass manufacturing apparatus with which the manufacturing method of the tube glass which concerns on embodiment of this invention is implemented. The front view which shows the muffle furnace and muffle door which concern on the 1st Embodiment of this invention. The front view which shows the muffle furnace and muffle door which concern on the 2nd Embodiment of this invention. The front view which shows the muffle furnace and muffle door which concern on the 3rd Embodiment of this invention. The front view which shows the muffle furnace and muffle door which concern on the 4th Embodiment of this invention. The rear view which shows the muffle furnace and muffle door which concern on the 5th Embodiment of this invention.

  Next, embodiments of the invention will be described. FIG. 1 is a side view of the tube glass manufacturing apparatus 10. In addition, the downstream side (arrow direction of FIG. 1) of a tube glass manufacturing process is demonstrated as the front, and an upstream side is demonstrated as back.

  First, the tube glass manufacturing apparatus 10 in which the manufacturing method of the tube glass G which concerns on this embodiment is implemented is demonstrated using FIG.

  A tube glass manufacturing apparatus 10 according to the present embodiment is a dunner type tube drawing apparatus using a sleeve, and includes a glass melting furnace 1, a sleeve 2, a sleeve driving device 3 that rotationally drives the sleeve 2, and a muffle that stores the sleeve 2. It has a furnace 4, a traveling path 5, a transport roller 6, a tube drawing machine 7, a cutting machine 8, a conveyor 9 and the like. The tube glass G is formed by supplying the molten glass melted in the glass melting furnace 1 to the sleeve 2 and extending the molten glass from the tip of the sleeve 2 using the transport roller 6 and the tube drawing machine 7.

  The glass melting furnace 1 is a furnace for melting a glass raw material, and the molten glass melted in the glass melting furnace 1 is supplied to the sleeve 2 in the muffle furnace 4.

  The sleeve 2 is made of a refractory formed in a cylindrical shape, and the tip end portion 2a is formed in a tapered shape whose diameter decreases toward the tip end side. The sleeve 2 is formed into a cylindrical shape by rotating the molten glass supplied to the muffle furnace 4 by rotating. The sleeve 2 is disposed so as to be inclined downward toward the distal end portion 2 a and is connected to the shaft 21 of the sleeve driving device 3. The shaft 21 is inserted from the proximal end portion 2b of the sleeve 2 to the distal end portion 2a. The sleeve 2 is stored in the muffle furnace 4.

  The muffle furnace 4 is provided on the downstream side of the glass melting furnace 1, and a molten glass supply port 4 </ b> A for allowing the molten glass supplied from the glass melting furnace 1 to flow in is provided. The molten glass supply port 4A is arranged at a position where the molten glass can flow down to the sleeve 2. In the present embodiment, the molten glass supply port 4A is provided directly above the base end portion 2b of the sleeve 2. ing. A tube glass outlet 4B is provided on the downstream side of the muffle furnace 4, and a muffle door 11 is provided at the tube glass outlet 4B. The tube glass outlet 4B is formed in a rectangular shape as viewed from the drawing direction of the tube glass G, as shown in FIG. A sleeve opening 4 </ b> C is provided on the upstream side of the muffle furnace 4.

  The traveling path 5 is provided on the downstream side of the muffle furnace 4 and has a curved shape. The traveling path 5 is covered with a box-shaped cover whose bottom surface is open.

  The conveyance roller 6 is provided on the downstream side of the traveling path 5 and the traveling path 5, and transports the tube glass G to the downstream side while supporting the tube glass G from below. A plurality of conveying rollers 6 provided on the downstream side of the traveling path 5 are arranged in the horizontal direction at equal intervals.

The tube drawing machine 7 is provided on the downstream side of the traveling path 5, pulls the tube glass G fed out from the traveling path 5 at a constant speed, and feeds it toward the cutting machine 8.
The tube drawing machine 7 has endless belts arranged on the upper and lower sides, and moves the tube glass G by sandwiching the upper and lower surfaces of the tube glass G by the upper and lower belts and towing them in the downstream direction.

  The cutting machine 8 cuts the tube glass G sent out from the tube drawing machine 7 every fixed length, and has the same configuration as the conventional one. The tube glass G cut by the cutting machine 8 is conveyed to the next process by the conveyor 9.

Next, the muffle door 11 will be described with reference to FIG. FIG. 2 shows a first embodiment of the present invention.
The muffle door 11 is a member for adjusting the atmospheric temperature in the muffle furnace 4, and is provided so as to cover a part of the tube glass outlet 4B in a front view. The muffle door 11 is configured to be movable in the vertical direction relative to the tube glass outlet 4B. The muffle furnace 11 changes the opening area of the tube glass outlet 4B by adjusting the amount of movement in the vertical direction. The atmospheric temperature in 4 can be adjusted.

  As shown in FIG. 2, the muffle door 11 has a substantially gate shape when viewed from the front. In other words, the position of the lower surface of the central portion of the muffle door 11 is configured to be higher than the positions of the lower surfaces of both end portions. An inclined surface 11a is formed on the lower surface of the center portion of the muffle door 11, and in this embodiment, the inclined surface 11a is continuously inclined above the tube glass G passing through the tube glass outlet 4B. In more detail, in this embodiment, as shown in FIG. 2, the inclined surface 11a is formed in the lower surface of the center part which becomes a part located in the upper part of the tube glass G which passes the tube glass exit 4B in the muffle door 11. The inclined surface 11a is formed to continuously incline downward as it goes to the left side. In addition, the horizontal width of the inclined surface 11a is larger than the diameter of the tube glass G.

  Since the muffle door 11 is a wall that separates the inside of the muffle furnace 4 from the outside air, a temperature difference occurs between the front and back of the muffle door 11, and liquid adheres (condenses) to the inner wall of the muffle door 11. The liquid is a liquid containing a boric acid component contained in the molten glass, has a high viscosity, moves downward along the inner wall of the muffle door 11, and gathers into large droplets. The liquid that has become a large drop falls from the lower end of the muffle door 11.

  Since the inclined surface 11a is formed on the muffle door 11, the liquid formed at the center of the muffle door 11 moves to the lowermost end (left end) of the inclined surface 11a (in the direction of arrow D1 in FIG. 2). Thereby, it is possible to prevent the liquid from falling on the tube glass G.

FIG. 3 shows a second embodiment of the present invention. As shown in FIG. 3, the muffle door 11 has an inclined surface 11b formed on the lower surface of the central portion, and the inclined surface 11b is located above the tube glass G and is formed by combining two inclined surfaces.
The inclined surface 11b includes a first inclined surface 13a that is inclined upward as it goes from the left end to the right side, and a second inclined surface 13b that is inclined upward as it goes from the right end to the left side. An intersection line 13c between the first inclined surface 13a and the second inclined surface 13b is directly above the tube glass G passing through the tube glass outlet 4B and is at the highest position on the inclined surface 11b.

  The inclined surface 11b has a first inclined surface 13a and a second inclined surface 13b, and these intersecting lines 13c are directly above the tube glass G and are at the highest position on the inclined surface 11a. The liquid collected on the lower surface of the muffle door 11 moves downward (the left end of the first inclined surface 13a or the right end of the second inclined surface 13b) along the first inclined surface 13a or the second inclined surface 13b ( Arrow D2 direction in FIG. 3). Thereby, it is possible to prevent the liquid from falling on the tube glass G.

  In the present embodiment, the intersecting line 13c is configured to be directly above the tube glass G. However, the present invention is not limited to this, and the intersecting line 13c is a position other than just above the tube glass G. With this configuration, the liquid collected on the lower surface of the muffle door 11 can be moved to the left end of the first inclined surface 13a or the right end of the second inclined surface 13b.

FIG. 4 shows a third embodiment of the present invention. As shown in FIG. 4, the inclined surface 11c is formed in the lower surface of the center part of the muffle door 11, and the inclined surface 11c is above the tube glass G, and has two inclined surfaces inclined in the same direction and a substantially vertical surface. It is formed in combination.
The inclined surface 11c includes a first inclined surface 13d that is inclined upward as it goes from the left end to the right side, a second inclined surface 13e that is inclined upward as it goes from the lower side of the right end portion of the first inclined 13c to the right side, It is comprised from the substantially perpendicular surface 13f which connects these provided in the position between the one inclined surface 13d and the 2nd inclined surface 13e. The substantially vertical surface 13f is disposed immediately above the tube glass G passing through the tube glass outlet 4B. That is, the inclined surface 11c forms a downward sloping slope with a stepped portion formed in the middle.

The inclined surface 11c is provided with a first inclined surface 13d, a second inclined surface 13e, and a substantially vertical surface 13f connecting the first inclined surface 13d and the second inclined surface 13e. The liquid collected on the lower surface of the muffle door 11 moves downward (to the left end of the first inclined surface 13d) along the first inclined surface 13d or the second inclined surface 13e (see FIG. 4 arrow D3 direction). Thereby, it is possible to prevent the liquid from falling on the tube glass G.
In this way, when the inclined surface is formed by inclining in one direction, it may be formed in a continuous inclination in one direction as in the inclined surface 11a shown in FIG. 2, or the inclined surface shown in FIG. 11c, the first inclined surface 13d and the second inclined surface 13e can be formed in a discontinuous inclination having a substantially vertical surface 13f connecting them.

  In the present embodiment, the substantially vertical surface 13f is configured to be directly above the tube glass G, but is not limited thereto, and the substantially vertical surface 13f is not directly above the tube glass G. The liquid collected on the lower surface of the muffle door 11 can be moved to the left end of the inclined surface 11c.

FIG. 5 shows a fourth embodiment of the present invention. As shown in FIG. 5, the inclined surface 11d is formed in the lower surface of the center part of the muffle door 11, and the inclined surface 11d can also be set as a curve inclination.
The inclined surface 11d is configured to have a semicircular arc shape. The position where the tangent of the semicircle of the inclined surface 11d is horizontal is disposed immediately above the tube glass G passing through the tube glass outlet 4B. That is, the inclined surface 11d forms a convex arcuate slope. That is, the left half of the inclined surface 11d is formed with a right-up slope (positive slope), and the right half is formed with a right-down slope (negative slope). The height position of the boundary point with the half slope (the point where the slope changes from positive to negative) is the highest position.

  Since the muffle door 11 is formed with an upwardly convex arcuate slope, the liquid collected on the lower surface of the muffle door 11 moves downward (left end or right end) along the slope 11d (in the direction of arrow D4 in FIG. 5). ). Thereby, it is possible to prevent the liquid from falling on the tube glass G.

  In this embodiment, the position where the tangent of the semicircle of the inclined surface 11d is horizontal is configured to be directly above the tube glass G, but the present invention is not limited to this, and the position of the inclined surface 11d is not limited thereto. By configuring the semi-circular tangent to be at a position other than directly above the tube glass G, the liquid collected on the lower surface of the muffle door 11 can be moved to the left end or the right end.

FIG. 6 shows a fifth embodiment of the present invention. As shown in FIG. 6, a liquid drop prevention member 12 that protrudes inside the muffle furnace 4 is provided at least directly above the tube glass G and below the inclined surface 11a.
As shown in FIG. 6, the liquid fall prevention member 12 is formed in a plate shape, and both ends of the liquid fall prevention member 12 are provided on the muffle door 11 so that the longitudinal direction is parallel to the slope of the inclined surface 11a. The liquid drop prevention member 12 is separated from the muffle door 11 and has a gap. The liquid fall prevention member 12 is disposed at least directly above the tube glass G. In the present embodiment, the liquid fall prevention member 12 is formed so that the length in the longitudinal direction is substantially the same as the length of the inclined surface 11a. Yes.

  The liquid adhering to the inner wall of the muffle door 11 moves downward along the inner wall, gathers on the inclined surface 11a, and the liquid moves downward (left end in this embodiment) along the inclined surface 11a ( Arrow D5 direction in FIG. 6). When moving along the inclined surface 11a, some liquid may fall without reaching the left end, but the dropped liquid collects on the upper surface of the liquid fall prevention member 12 below. The liquid collected on the upper surface of the fall prevention member 12 moves downward (to the left end in the present embodiment) along the inclination of the upper surface of the fall prevention member 12 (in the direction of arrow D5 in FIG. 6), and further falls downward. Thereby, it is possible to prevent the liquid from falling on the tube glass G.

  In the present embodiment, the inclined surface 11a is configured as a continuous inclination, and the inclination is configured to be lower left. However, the present invention is not limited thereto, and is configured to be lower right. May be.

As described above, a tube glass manufacturing apparatus 10 that includes a muffle furnace 4 and a sleeve 2 disposed in the muffle furnace 4 and draws molten glass supplied onto the sleeve 2 from the tip of the sleeve 2, The muffle furnace 4 includes a tube glass outlet 4B for pulling out the tube glass G, and a muffle door 11 installed at the tube glass outlet 4B. The muffle door 11 includes an inclined surface 11a immediately above the tube glass G. Is.
By comprising in this way, since the liquid adhering to the muffle door 11 moves from right above the tube glass G, it can prevent falling to the tube glass G.

Further, a liquid fall prevention member 12 that protrudes from the inside of the muffle furnace 4 is provided at least on the side surface of the muffle door 11 on the side of the muffle furnace 4 and directly above the tube glass G.
By comprising in this way, since the liquid adhering to the muffle door 11 is induced | guided | derived to the other place from the directly upper direction of the tube glass G by the fall prevention member 12, it can prevent falling to the tube glass G. .

DESCRIPTION OF SYMBOLS 1 Glass melting furnace 2 Sleeve 3 Sleeve drive device 4 Muffle furnace 5 Travel path 6 Conveying roller 7 Pipe drawing machine 8 Cutting machine 10 Tube glass manufacturing apparatus 11 Muffle door 11a Inclined surface 11b Inclined surface 11c Inclined surface 11d Inclined surface 12 Liquid fall prevention member

Claims (3)

A tube glass manufacturing apparatus comprising a muffle furnace and a sleeve disposed in the muffle furnace, and drawing molten glass supplied onto the sleeve from a tip of the sleeve,
The muffle furnace includes a tube glass outlet for drawing out the tube glass, and a muffle door installed at the tube glass outlet,
The muffle door comprises an inclined surface above the tube glass,
A tube glass manufacturing apparatus characterized by that. Provided a liquid fall prevention member projecting from the inside of the muffle furnace on the side surface inside the muffle furnace of the muffle door and directly above the tube glass,
The tube glass manufacturing apparatus according to claim 1. A tube glass is manufactured by the tube glass manufacturing apparatus according to claim 1 or 2,
A method for producing tube glass, characterized in that:

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