JP2000302468A - Glass pane-carrying roll structure in glass pane-heating furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply join a roller body to a cooling pipe without attaching exclusive leak prevention mechanisms by rotatably joining both end parts of the cooling pipe placed so as to penetrate the roller body to the roller body through supporting tubes fixed on both ends of the roller body and bearing means. SOLUTION: In a glass heating furnace 14, glass pane is transferred with a glass pane-conveying roller 18 so as for the glass pane to be heated up to a temperature needed for bending. A pipe 30 is placed so as to penetrate the body 28 of the roller 18 and cooling water circulates through the pipe 30 to cool the glass pane so as not to cause the unevenness of the glass pane. A water supply pipe 46 is coupled with one end of the pipe 30 and a drainpipe 60 is coupled with the other end. Larger- diameter parts 32A of support tubes 32 are fitted on both end parts 28A of the body 28 which protrudes outward from the wall 15 of the furnace 14 and support the body 28 while rotating with the body 28. The end parts of small-diameter parts 32B of the tubes 32 fitted on both end parts 28A are rotatably coupled respectively with fixed sleeves 38, 44 supporting/fixing the both end parts 30A of the pipe 30 respectively through thrust bearings 34, 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass sheet conveying roller structure of a glass sheet heating furnace, and more particularly, to a structure of a glass sheet conveying roller provided in a glass sheet heating furnace installed in a glass sheet bending apparatus.

[0002]

2. Description of the Related Art There is known a bending apparatus in which a glass sheet conveying roller is disposed in a heating furnace, and a heating furnace for heating the glass sheet to near a softening point while conveying the glass sheet by the glass sheet conveying roller. The bending apparatus is provided with a forming zone on the downstream side of a heating furnace and a wind-cooling strengthening apparatus.The glass sheet heated in the heating furnace is bent and formed in the forming zone, and then the wind-cooling strengthening apparatus is provided. The product is strengthened by air cooling and commercialized.

[0003] In the heating furnace, the temperature inside the furnace is set to about 800 ° C in order to heat the glass sheet to near the softening point (about 600 to 700 ° C). In such a conventional bending apparatus, there are cases where minute irregularities are formed on the surface of a commercialized glass sheet, and the glass sheet with such irregularities is treated as a defective product in terms of quality. There was a drawback that the properties were poor.

It is considered that the reason why the surface of the glass sheet is uneven is that minute unevenness (unevenness generated by machining or the like) on the surface of the glass sheet conveying roller is transferred to the glass sheet during conveyance of the glass sheet. . It is considered that the transfer of the unevenness of the glass plate transport roller to the glass plate occurs when the temperature of the glass plate transport roller becomes about 50 degrees or more higher than the temperature of the glass plate.

[0005] The reason why the temperature of the glass sheet conveying roller becomes higher than the temperature of the glass sheet is that the glass sheet conveying roller stores heat by the heat of the heating furnace. Therefore, as one means for solving the above problem, the temperature of the heating furnace is set to 800
It is conceivable to lower the temperature below ° C. However, when the temperature of the heating furnace is decreased, the heating temperature of the glass sheet is also decreased, so that there is a disadvantage that the step of bending the glass sheet and the step of strengthening the air cooling are adversely affected.

Therefore, it is conceivable to prevent the occurrence of irregularities on the glass plate by lowering only the temperature of the glass plate transport roller without lowering the temperature of the heating furnace. For example, it is conceivable to cool the roller body by forming the roller body of the glass plate transport roller into a hollow cylindrical body, inserting a pipe through the roller body, and supplying cooling water to the pipe.

[0007]

Incidentally, as a glass plate conveying roller having a cooling function, Japanese Unexamined Utility Model Publication No. 5-960 is known.
A roller disclosed in Japanese Patent Publication No. 31 is known. According to this glass plate transport roller, a pipe is disposed in a hollow roller body, and a cooling medium is supplied to the pipe to cool the roller body.

However, Japanese Utility Model Application Laid-Open No. 5-96031 does not disclose anything about the connection structure between the roller body of the glass plate conveying roller and the pipe. For example, if the roller body and the pipe are connected in a structure that rotates integrally, the pipe and the cooling medium supply pipe on the fixed side must be connected via a rotary joint, which complicates the structure. In addition, there is a disadvantage that a structure for preventing leakage of the cooling medium must be added to the rotary joint.

The present invention has been made in view of such circumstances, and it is possible to connect a roller body of a glass plate conveying roller and a pipe with a simple connection structure and without providing a dedicated leakage prevention mechanism. It is an object of the present invention to provide a glass sheet conveying roller structure of a glass sheet heating furnace that can be used.

[0010]

In order to achieve the above object, the present invention provides a glass sheet heating furnace for heating a glass sheet to a predetermined temperature, and a glass sheet for conveying the glass sheet in the heating furnace. A transport roller, a glass body comprising a roller body formed in a hollow cylindrical body and transporting the glass plate by being rotated, and a pipe inserted through the roller body and through which cooling water flows. In the plate transport roller, the pipe is penetrated through the roller body, and both ends of the roller body are rotatably connected to the pipe via bearing means, and cooling water is supplied to one end of the pipe. A pipe is connected, and a cooling water discharge pipe is connected to the other end of the pipe.

According to the present invention, a pipe is disposed through the roller body, both ends of the roller body are rotatably connected to the pipe via bearing means, and a fixed side cooling water supply is connected to one end of the pipe. Since the pipe is connected and the cooling water discharge pipe on the fixed side is connected to the other end of the pipe, the roller body and the pipe can be connected with a simple connection structure and without providing a dedicated leakage prevention mechanism. .

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a glass sheet transport roller structure of a glass sheet heating furnace according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing the structure of a glass sheet bending apparatus 10 employing a glass sheet conveying roller according to an embodiment of the present invention. The forming apparatus 10 shown in FIG. 1 is an apparatus for bending and forming a side glass plate 12 for an automobile to a predetermined curvature, and is mainly composed of a glass plate heating furnace 14.

The bending process of the glass sheet 12 by the forming apparatus 10 will be described. The glass sheet 12 before bending is placed in the heating furnace 1 by a roller conveyor (not shown) after the transport position is determined at the entrance of the heating furnace 14.
4 is conveyed. The glass sheet 12 is conveyed at a predetermined speed by a glass sheet conveying roller (hereinafter abbreviated as “conveying roller”) 18, 18 of the present embodiment installed in the heating furnace 14, Heating is carried out by the heater 14 and then at the outlet of the heating furnace 14 to the molding temperature (about 600 to 700 ° C.). The glass sheet 12 heated to the above-mentioned temperature is bent and formed into a predetermined shape as required, and then is air-cooled by an air-cooling apparatus (not shown) installed downstream of the heating furnace 14. The flow of the forming process of one glass plate 12 by the forming apparatus 10 has been described above.

The transport roller 18 is, as shown in FIG.
It is composed of a roller body 28, a pipe 30, and the like. The roller body 28 is disposed in the heating furnace 14, and both end portions 28 </ b> A, 28 </ b> A
The support pipes 32, 32 project slightly outward from the support pipe 5, and are supported by the support pipes 32, 32. The support tube 32 is formed of a large-diameter portion 32A and a small-diameter portion 32B, and the end 28A of the roller main body 28 is fitted and fixed to the large-diameter portion 32A. The length of the pipe 30 is longer than the length of the roller body 28 and protrudes from an end 28A of the roller body 28. Thus, the portion projecting from the end 28A of the pipe 30 is inserted into the small diameter portion 32B.

As shown in FIG. 3, the support pipe 32 on the upper right side of FIG. 2 is a thrust bearing (corresponding to bearing means) 34.
In addition, it is rotatably supported by a fixing sleeve 38 (corresponding to a fixing member) via a stopper ring 36. 3 is rotatably supported by a fixed sleeve 44 via a thrust bearing (corresponding to bearing means) 40 and a spring 42. Therefore, the roller main body 28 is rotatably supported by the fixed sleeves 38 and 44, and is rotatable with respect to the pipe 30. The roller body 28 is urged rightward by the urging force of the spring 40 as shown by the upper arrow in FIG. By the urging force of the spring 40, the support pipe 32 on the right side in FIG. 3 is pressed against the stopper ring 36 via the thrust bearing 34. Thus, the roller main body 28 is rotated in the heating furnace 14 without being displaced in the axial direction. Although not shown in FIGS. 2 and 3, a drive mechanism for rotating the roller body 28 is connected to one of the support tubes 32.

The roller body 28 and the support tube 32 are both formed in a cylindrical shape, and the pipe 30 is disposed inside thereof as shown in FIG. The upper right end 30A of the pipe 30 in FIG. 3 is fastened to the fixed sleeve 38, and the upper left end 30A in FIG. The fixed sleeve 44 is connected to a cooling water tank 48 via a cooling water supply pipe 46 as shown in FIG. The supply pipe 46 is provided with a thermometer 50, a shutoff valve 52, a pump 54, and a liquid level gauge 56. The liquid level gauge 56 is provided with the cooling water 58 stored in the cooling water tank 48.
The liquid level of the cooling water 58 is detected. According to the cooling water supply system configured as described above, when the pump 54 is driven, the cooling water 58 in the cooling water tank 48 is supplied to the pipe 3 via the supply pipe 46 and the fixed sleeve 44.
0 is supplied. The temperature of the cooling water 58 is measured by the thermometer 50, and the supply of the cooling water 58 is stopped by closing the shutoff valve 52.

The fixed sleeve 38 is connected to a recovery tank 62 via a cooling water return pipe (corresponding to a cooling water discharge pipe) 60. Therefore, the cooling water 58 that has passed through the pipe 30 is recovered in the recovery tank 62 via the return pipe 60. A thermometer 64 is provided in the return pipe 60, and the temperature of the cooling water 58 is measured by the thermometer 64.

The collection tank 62 is connected to a cooling device 68 via a pipe 66. The pipe 66 is provided with a pump 70. When the pump 70 is driven, the cooling water 58 in the recovery tank 62 is cooled by the cooling device 68.
, Where it is cooled to a predetermined temperature. The cooled cooling water 58 is returned to the cooling water tank 48 via a pipe 72 connected to the cooling device 68. Then, it is supplied to the pipe 30 again. Therefore, the cooling water 58
The cooling water is supplied to the pipe 30 by a cooling water supply device (corresponding to cooling water supply means) 74 having the structure shown in FIG.

On the other hand, the cooling water tank 48
A replenishing tank 78 is connected via the connection 6. A pump 80 is provided in the pipe 76, and when the pump 80 is driven, the cooling water 58 in the replenishment tank 78 is supplied to the cooling water tank 48. ON / OFF of the pump 80 is controlled by a control device 82. In the ROM 84 of the control device 82, the upper limit value and the lower limit value of the water level of the cooling water 58 in the cooling water tank 48 are stored in advance, and when the lower limit value is detected by the liquid level meter 56, the control device 82 turns on the pump 80. Thereby, the cooling water 58 in the replenishing tank 78 is supplied to the cooling water tank 48, and the cooling water 58 in the cooling water tank 48 is replenished. When the liquid level gauge 56 detects the upper limit, the controller 82 turns off the pump 80. Thereby, the replenishment of the cooling water 58 is stopped.

Further, the control device 82 controls the thermometer 50,
The cooling device 68 is controlled so that the temperature of the cooling water 58 becomes constant based on the cooling water temperature measured at 64. Thereby, the cooling water 58 at a constant temperature is supplied to the pipe 30. Therefore, according to the transport roller 18 and the cooling water supply device 74 configured as described above, when the cooling water 58 is supplied to the pipe 30 by the cooling water supply device 74, the roller body 28 of the transport roller 18 passes through the pipe 30. The cooling water 58 can be used for cooling.

Thus, when the transport roller 18 is used, an excessive rise in the temperature of the transport roller 18 can be easily prevented, and the temperature of the transport roller 18 can be controlled to be equal to or lower than the critical temperature of the uneven transfer temperature. So you can
The problem that the glass plate 12 is uneven can be solved without lowering the heating temperature of the glass plate 12 by the heating furnace 14.

The transport roller 18 has a pipe 30 penetrating through a roller body 28 and supporting pipes 32, 32 at both ends of the roller body 28 are rotatably connected to the pipe 30 via thrust bearings 34, 40. Connected. The fixed side cooling water supply pipe 4 is connected to one end of the pipe 30.
6 through a fixing sleeve 44, and a fixed-side cooling water return pipe 60 is connected to the other end of the pipe 30 by a fixing sleeve 38.
, The roller body 28 and the pipe 30 can be connected with a simple connection structure and without providing a dedicated leakage prevention mechanism.

On the other hand, without using the pipe 30,
The cooling water 58 may be directly supplied to the hollow portion of the roller body 28 to cool the roller body 28. In this case, in order to eliminate the fear that the cooling water 58 supplied to the roller body leaks into the heating furnace 14, the roller body 28 is formed longer,
The connection between the roller body 28 and the supply pipe 46 and the return pipe 60 may be separated from the heating furnace 14 as far as possible.

[0024]

As described above, according to the glass sheet conveying roller structure of the glass sheet heating furnace according to the present invention, the pipe is disposed through the roller body, and both ends of the roller body are connected to the pipe via the bearing means. The roller body and the pipe are easily connected because they are rotatably connected, and a fixed-side cooling water supply pipe is connected to one end of the pipe, and a fixed-side cooling water discharge pipe is connected to the other end of the pipe. The connection can be performed with a connection structure and without providing a dedicated leakage prevention mechanism.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a glass sheet bending apparatus to which a glass sheet transport roller according to an embodiment is applied.

FIG. 2 is an explanatory diagram showing the structure of a glass plate transport roller and a cooling water supply device shown in FIG.

FIG. 3 is a cross-sectional view illustrating a connection structure between a roller body and a pipe of the glass plate transport roller illustrated in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Bending machine of a glass plate 12 ... Glass plate 14 ... Heating furnace 18 ... Glass plate conveyance roller 28 ... Roller body 30 ... Pipe 48 ... Cooling water tank 74 ... Cooling water supply device 82 ... Control device

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takaaki Fukai 426-1 Ozawa Uehara, Kakuda, Aikawa-cho, Aiko-gun, Kanagawa Prefecture F-term in Asahi Glass Co., Ltd. 3F033 GA06 GB01 GB06 GE04 4G015 AA03 GA00

Claims (3)

[Claims] 1. A glass sheet conveying roller provided in a glass sheet heating furnace for heating a glass sheet to a predetermined temperature, for conveying the glass sheet in the heating furnace, the roller being formed in a hollow cylindrical body and rotating. In the glass plate transport roller composed of a roller body that transports the glass plate and a pipe that is inserted through the roller body and through which cooling water flows, the pipe is disposed through the roller body. At the same time, a cooling water supply pipe is connected to one end of the pipe,
A cooling water discharge pipe is connected to the other end of the pipe, and both ends of the roller body are rotatably connected to a fixing member that fixes and supports both ends of the pipe via bearing means. A glass sheet transport roller structure for a glass sheet heating furnace. 2. The apparatus according to claim 1, wherein the length of the pipe is longer than the length of the roller body, and the pipe is disposed so as to protrude from both ends of the roller body. A glass sheet transport roller structure of the glass sheet heating furnace according to the above. 3. A support tube is rotatably interposed between said bearing means and both ends of said roller body by said fixing member, said support tube being a roller for fixedly supporting both ends of said roller body. 3. The glass sheet heating according to claim 2, further comprising a support portion and an insertion portion into which a protrusion of the pipe from the roller body is inserted, wherein the insertion portion is connected to the bearing means. Glass plate transport roller structure of furnace.