KR20110074689A - Annealing lehr for float glass making apparatus - Google Patents

Abstract

PURPOSE: A cooling lehr for a float glass manufacturing apparatus is provided to uniformly accelerate the cooling process of float glass and prevent dust from attaching to the surface of the float glass. CONSTITUTION: A cooling lehr for a float glass manufacturing apparatus is arranged at the lower side of a slow cooling furnace(5) and slowly cools cooled float glass to a cuttable temperature while the float glass is transferred to a returning roll(7). The cooling lehr includes a chamber(9) surrounding the returning roll. The chamber includes an external air supplying part(12) and an air discharging part(13). The external air supplying part supplies external air, and the air discharging part discharges the air from the inside of the chamber. The pressure in the chamber is constantly maintained.

Description

Cooling rare of float glass manufacturing equipment {ANNEALING LEHR FOR FLOAT GLASS MAKING APPARATUS}

This invention relates to the cooling rare after slow cooling in float glass manufacture.

Float glass supplies the molten glass manufactured in the molten-glass manufacturing area | region on the molten tin of a float bath, shape | molds it to ribbon glass, and pulls out the shaped ribbon glass from a float bath, and then the strain point of glass in a slow cooling furnace It cools slowly to below temperature, it cools to the temperature which can be cut | disconnected by a cooling rare, and it cut | disconnects to predetermined size with a cutting device (refer FIG. 3 of following patent document 1).

Figure 4 schematically shows the process from the production of the float glass to cutting. As shown in FIG. 4, the float glass 41 shape | molded in ribbon shape on the molten tin 42 of the float bath 43 is provided in the lift out part 44 provided in the exit of the float bath 43, It is pulled out of the molten tin phase by the lift out roll 48 which exists, and is conveyed to the slow cooling furnace 45 arrange | positioned adjacent to the lift out part 44 downstream. The slow cooling furnace 45 is a temperature-adjustable facility which has the surrounding structure 51, has a length of about 200m, conveys the float glass 41 to the conveyance roll (conveying apparatus) 47 provided inside, and conveys The float glass 41 is gradually cooled to below the strain point temperature of the glass. The float glass 41 cooled slowly in the slow cooling furnace 45 still has a high temperature of about 150 to 300 ° C. at the outlet of the slow cooling furnace 45.

After the high temperature float glass 41 is conveyed to the cooling rare 46 which is continued downstream of the slow cooling furnace 45, and cooled to the temperature of room temperature vicinity which can be cut | disconnected while conveyed by the said cooling rare 46, It is cut by the cutting device 55 in the cutting workshop downstream of the cooling rare 46.

Japanese Patent Publication No. 2009-155164

Since the conventional cooling rare 46 is an installation only for the conveyance roll which does not have an enclosure structure as shown in FIG. 4, the high temperature float glass 41 after slow cooling is mounted in the conveyance roll of the said cooling rare 46. It naturally cools by the contact with external air during conveyance. Therefore, the cooling rare 46 needs a very long distance to cool the float glass 41 cooled by the slow cooling furnace 45 to the temperature which can be cut | disconnected, and has a length of about 10-200m. Hereinafter, the conventional cooling rare only of the conveyance roll which does not have an surrounding structure is called "open cooling rare."

In the atmosphere surrounding the open cooling rare, fine dust or the like may scatter from the outside or the cutting workshop, and the float glass is conveyed while being exposed to the atmosphere in which such dust or the like is scattered. Therefore, the dust etc. in atmosphere may fall down and adhere to the surface of float glass. In particular, in the upstream region of the open cooling rare, since the float glass is still at a high temperature, dust or the like adhering to the surface of the float glass tends to adhere to the glass.

Moreover, in open cooling rare, since float glass is cooled by natural cooling, it may be difficult to fully cool depending on the temperature of an atmosphere and the kind of glass. In order to solve such a lack of cooling, when cooling is blown by air locally, a cooling nonuniformity arises and curvature produces, and the quality of a float glass falls.

An object of this invention is to provide the cooling rare of the float glass manufacturing apparatus which prevents dust etc. from adhering to the surface of a float glass, and promotes the cooling of a float glass unevenly.

This invention is the cooling rare which arrange | positions in the downstream of the slow cooling furnace which slow-forms the molded float glass, and cools to the temperature which can be cut | disconnected while conveying the said float glass cooled by the slow cooling furnace to a conveyance roll, The said cooling rare is the said conveyance roll It has a chamber surrounding the chamber, the chamber is provided with a supply for supplying the outside air and the discharge for discharging the air in the chamber to the outside, the pressure in the chamber is maintained at a constant pressure with respect to the pressure outside the chamber It provides the cooling rare of the float glass manufacturing apparatus.

In the cooling rare of the float glass manufacturing apparatus of this invention, it is preferable that the said supply part is provided in the downstream part of the said chamber, and the said discharge part is provided in the upstream part of the said chamber.

In the cooling rare of the float glass manufacturing apparatus of this invention, it is preferable that the blower is provided in the said supply part.

In the cooling rare of the float glass manufacturing apparatus of this invention, it is preferable that the said supply part and the said discharge part are provided in the ceiling part of the said chamber.

In the cooling rare of the float glass manufacturing apparatus of this invention, the said supply part and the said discharge part have slit-shaped opening part opened parallel to the width direction of the said float glass conveyed, respectively, and the both ends of each said opening part are from an upper surface. It is preferable that it is a shape located in the outer side of the width direction both ends of the said float glass conveyed.

In the cooling rare of the float glass manufacturing apparatus of this invention, it is preferable that the guide for inducing outside air toward the said float glass conveyed around the said supply part is provided.

Moreover, this invention provides the cooling method of the float glass using the said cooling rare.

According to the present invention, it is possible to prevent dust or the like from adhering to the surface of the float glass, thereby obtaining a high quality float glass.

Moreover, the float glass can be efficiently cooled to non-uniformity up to the temperature which can be cut | disconnected, and the float glass without curvature can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS The cross-sectional explanatory drawing of the slow cooling and cooling rare which concerns on preferable embodiment of this invention.
FIG. 2 is a plan view (half illustration only) in the AA portion of the slow cooling / cooling rare layer of FIG. 1.
3 is an enlarged view of the cooling rare of FIG. 1;
4 is a cross-sectional explanatory diagram of a conventional slow cooling / cooling rare layer.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to drawings.

In addition, in this specification, the downward of a glass ribbon is a direction which a glass ribbon contacts with a conveyance roll, and an upward of a glass ribbon is a direction opposite to the said downward.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional explanatory view of a slow cooling / cooling rare according to a preferred embodiment of the present invention. Fig. 2 is a plan view in the AA section thereof. This is also the same symmetry with this. As shown in the figure, the float glass 1 molded into the ribbon shape on the molten tin 2 of the float bath 3 is lifted out provided in the lift out portion 4 arranged at the outlet of the float bath 3. It is pulled up from the molten tin 2 by the roll 8, and is conveyed to the slow cooling furnace 5 arrange | positioned adjacent to the lift out part 4. In the lift out part 4, several rolls other than the lift out roll 8 are arrange | positioned at the level higher than molten tin surface, and the float glass 1 shape | molded in ribbon shape in the float bath 3 is a lift out roll. After being pulled up by (8), it is cooled in the lift-out part 4 having the surrounding structure 10 and sent to the slow cooling furnace 5 as a stable ribbon glass.

The slow cooling furnace 5 is the apparatus which can adjust the temperature which has the surrounding structure 11 similarly to the general use, and the several conveyance roll 7 for conveying the float glass 1 is provided in the inside. These conveyance rolls 7 are driven by a drive motor (not shown), and convey the ribbon-shaped float glass 1. In addition, some conveyance rolls 7 may be rotatable without driving connection to a drive motor. The float glass 1 conveyed from the lift out part 4 is slowly cooled to below the strain point temperature of the glass so that undesirable thermal stress does not remain while being conveyed from the slow cooling furnace 5 to the conveying roll 7. Then, it is usually cooled until it reaches a temperature lower than the strain point temperature of the glass until it reaches the outlet of the slow cooling furnace 5. The float glass 1 cooled by the slow cooling furnace 5 is cooled to the temperature which can be cut | disconnected by the cooling rare 6 continuously, and is then sent to the cutting device 15 in the cutting workshop located downstream of the cooling rare 6. By a predetermined size. In this invention, although the temperature which can be cut | disconnected of the float glass 1 is a temperature near room temperature normally, the temperature slightly higher than that may be sufficient.

In the present invention, as shown in FIG. 1 and FIG. 2, a supply unit for forming a chamber 9 surrounding the conveyance roll 7 of the cooling rare 6 and supplying outside air to the chamber 9 ( 12) and a discharge part 13 for discharging the air in the chamber to the outside, the pressure in the chamber is also maintained at a constant pressure against the pressure outside the chamber.

In the present invention, for the purpose of installing the chamber 9 by enclosing the conveying roll 7 on the cooling rare 6, it is possible to prevent dust or the like in the outside air from falling down on the surface of the float glass 1. Can be mentioned. As mentioned above, in the conventional open cooling rare which does not have an enclosure structure, the dust etc. in the outside air fall down and adhere to the surface of the float glass 1, while cooling in a cooling rare, In the present invention, the cooling rare 6 By covering the float glass 1 being conveyed with the conveyance roll 7 of the chamber with the chamber 9, the dust etc. which fall down from the upper side to the surface of the float glass 1 are interrupted | blocked with an surrounding structure, and dust etc. It can be prevented from adhering to the surface of the float glass 1. In addition, as another object, the chamber 9 is provided by enclosing the conveyance roll 7 of the cooling rare 6, and supplying outside air to the inside of the chamber 9, and floats between the downstream and the upstream of the chamber ( It flows along 1), and the float glass 1 is cooled efficiently, and dust etc. do not adhere easily to the surface of the float glass 1 easily. If the ambient atmosphere of the float glass being conveyed by the conveying roll is in a stationary state as in the conventional open cooling rare, dust or the like in the outside air is easily attached to the surface of the float glass 1, but the outside air introduced into the chamber 9 is By flowing in this way, dust etc. can make it hard to adhere to the surface of the float glass 1.

In order for this object to be satisfactorily achieved, the chamber 9 surrounds the conveying roll 7 from the outlet of the slow cooling furnace 5 to the cutting workshop where the cutting operation is carried out using the cutting device 15, i.e. It is preferable that the said chamber 9 is provided so that the whole from the upstream to the downstream of the conveyance roll 7 of the cooling rare 6 may be enclosed. Moreover, it is preferable that both sides of the conveying roll 7 are provided so that not only the upper side but the lower side of the conveying roll 7 may be enclosed. In this case, the lower part of the chamber 9 may use the bottom surface of the building. It is preferable that a partition wall 17 is provided between the cooling rare 6 and the cutting workshop to cut off the cooling rare 6 from the cutting workshop, as shown in FIGS. 1 and 2. At this time, it is preferable that the chamber 9 forms a chamber 9 so as to surround the conveying roll 7 from the outlet of the slow cooling furnace 5 to the partition wall 17.

Next, the structure of the chamber 9 provided in the cooling rare 6 and its operation | movement are demonstrated.

3 is an enlarged view of the chamber 9 shown in FIG. As shown in FIG. 3, the said chamber 9 has the magnitude | size which can fully ensure the space to the upper side and both sides of the float glass 1 conveyed inside the cooling rare 6 with the conveyance roll 7, It is preferable. Since the size of the chamber 9 is determined based on the length of the cooling rare 6, the width of the conveying roll 7, etc., it is not specified, but about 1-15 m above both the conveying rolls 7, both sides (both sides) It is preferable to obtain a space of about 0.5 to 10 m in If such spaces are provided above and on both sides of the conveying roll 7, the outside air introduced into the chamber 9 can flow unevenly in the said space, and the float glass 1 can be cooled uniformly.

In the present invention, the chamber 9 is provided with a supply unit 12 for supplying outside air to the chamber and a discharge unit 13 for discharging air in the chamber to the outside. The supply unit 12 is preferably equipped with a blower (blowing fan) 14. The blower 14 is an effective means for supplying the outside air to the chamber 9 to make the inside of the chamber constant pressure against the outside. By introducing the outside air into the chamber 9 from the supply unit 12 by the blower 14, the air in the chamber is naturally discharged from the discharge unit 13, but the discharge unit 13 is also equipped with an exhaust fan. The air may be actively discharged. The supply amount of outside air from the supply part 12 can be performed by control of the rotation speed of the blower 14. Although not shown, cooling air rare is provided by respectively providing air volume control valves in the supply portion 12 and the discharge portion 13 to adjust the amount of outside air supplied to the chamber 9 and the amount of air discharged to the outside. The cooling capacity of (6) may be adjusted, or the pressure in the chamber may be maintained at a constant pressure rather than outside the chamber, whereby dust or the like from outside may be difficult to penetrate into the chamber.

When the supply part 12 and the discharge part 13 are installed in the chamber 9, the supply part 12 is installed downstream of the chamber 9, and the discharge part 13 is located upstream of the chamber 9. It is desirable to install. By providing the supply part 12 and the discharge part 13 to the chamber 9 in this way, the external air introduced from the downstream part of the chamber 9 is immersed in the temperature gradient which drips down in the downstream direction of the float glass 1. The float glass 1 is gradually cooled from the downstream of the low temperature toward the upstream of the high temperature, and after that, the float glass 1 can be gradually cooled and discharged from the upstream of the chamber 9 to the outside.

The said supply part 12 and the discharge part 13 are normally provided in the chamber 9, respectively, but can also be expanded as needed. As a position provided in the chamber 9, the upper direction of the conveyance roll 7 in the ceiling part of the chamber 9 is preferable. It is preferable that the said supply part 12 is installed in the ceiling part of the chamber 9 especially, and supplies external air from the upper side of the float glass 1. In this case, if the said supply part 12 and the discharge part 13 are located in the ceiling part of the chamber 9, introduction of external air may be performed, for example from the side part of the chamber 9, and also inside the chamber 9; Some or all of the air may be discharged from the side of the chamber 9.

In addition, the shape of the said supply part 12 and the discharge part 13 may be a duct shape, a box shape, etc. may be sufficient as it. The shape of the opening part (supply port) of the supply part 12 and the opening part (exhaust port) of the discharge part 13 may be circular shape, rectangular shape, etc. other than the slit shape shown by the dashed-dotted line in FIG. By providing the slit-shaped opening of the supply part 12 and the discharge part 13 in parallel with the width direction of the float glass 1, the supply of the outside air to the chamber 9 and discharge | emission to the outside of the air in a chamber are float glass. It can perform uniformly with respect to the width direction of (1). In addition, in order to cool the float glass 1 uniformly in the width direction, it is preferable that both ends of the slit-shaped opening part are a shape located in the outer side about 50 cm from the width direction both ends of the float glass 1 from the upper surface, for example. Do.

Moreover, around the supply part 12 for supplying outside air to the chamber 9, the guide 16 for guiding the outside air introduce | transduced in the chamber to the vicinity of the float glass 1 as shown in FIG. 3 is provided. It is desirable to be. The guide 16 has a cylindrical or box shape made of a heat resistant steel sheet, and extends downward from the periphery of the supply portion 12 by a predetermined length. And it is preferable to set the length of the guide plate of the downstream side of the guide 16 longer than the guide plate of an upstream, and to make the space | interval of the lower end of the downstream guide plate and the float glass 1 into about 1-100 cm. Do. By providing such a guide 16 in the supply part 12, the outside air supplied from the supply part 12 is induced to the vicinity of the float glass 1, and is discharged from the lower end of the guide 16 in the upstream direction of the chamber 9. After that, it can flow along the plate surface of the float glass 1. In addition, although the guide 16 of this example is excellent in the induction | inducement of the outside air with respect to the float glass 1, the shape of the guide 16 is not limited to this. For example, you may curve the lower end part of the guide 16 so that the direction of the opening part of the supply part 12 may be an upstream direction of the chamber 9.

As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to this, It can change suitably in the range which can achieve an objective. For example, by cleansing the outside air introduced into the chamber surrounding the conveyance device of the cooling rare in advance, dust or the like adhering to the surface of the float glass in the cooling rare can be further reduced.

This application is based on the JP Patent application 2009-295979 of an application on December 25, 2009, The content is taken in here as a reference.

This invention is excellent as a cooling rare in float glass manufacture, and is especially suitable for manufacturing the glass substrate for LCDs with a high molding temperature and high quality which is required by the float method.

1: float glass
2: molten tin
3: float bath
4: lift out
5: slow cooling furnace
6: cooling rare
7: bounce roll
8: lift out roll
9: chamber
10: surrounding structure
11: surrounding structure
12: supply
13: outlet
14: blower
15: cutting device
16: guide
17: partition wall

Claims (7)

It is arrange | positioned downstream of the slow cooling furnace which slow-forms the molded float glass, and is a cooling rare which cools to the temperature which can be cut | disconnected while conveying the said float glass cooled by the slow cooling furnace to a conveyance roll, The said cooling rare surrounds the said conveyance roll The float glass manufacturing apparatus which has a chamber, The supply part for supplying outside air and the discharge part for discharging the air in the said chamber are provided outside, and the pressure in the said chamber is maintained at a constant pressure with respect to the pressure outside the said chamber. Cooling rare. The cooling rare of the float glass manufacturing apparatus of Claim 1 in which the said supply part is provided in the downstream part of the said chamber, and the said discharge part is provided in the upstream part of the said chamber. The cooling rare of the float glass manufacturing apparatus of Claim 1 or 2 with which the blower is provided in the said supply part. The cooling rare of the float glass manufacturing apparatus as described in any one of Claims 1-3 in which the said supply part and the said discharge part are provided in the ceiling part of the said chamber. The said supply part and the said discharge part each have a slit-shaped opening part opened in parallel with the width direction of the said float glass conveyed, The both ends of each said opening part of the float glass conveyed when seen from the upper surface Cooling rare of the float glass manufacturing apparatus which is a shape located in the outer side of the width direction both ends. The cooling rare of the float glass manufacturing apparatus of any one of Claims 1-5 in which the guide for inducing external air toward the said float glass conveyed is provided in the circumference | surroundings of the said supply part. The cooling method of the float glass using the cooling rare as described in any one of Claims 1-6.

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