KR20100044321A - Baking apparatus - Google Patents

Abstract

PURPOSE: A baking apparatus is provided to prevent the damage of a quartz tube by enabling a nozzle to be accurately located in the center of the quartz tube. CONSTITUTION: A rotation supporting part(110) supports both ends of a quartz tube. The rotation supporting part rotates the quartz tube. A bulb is inserted into the quartz tube. A centering part(130) lifts the quartz tube. The centering part accurately centers a hot air supplying nozzle. The hot air supplying nozzle supplies the hot air to the inner side of the quartz tube. A driving part(150) lifts and lowers the centering part. The driving part rotates the centering part. The hot air supplying part(170) comprises a plurality of hot air supplying nozzles.

Description

Baking apparatus

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a baking apparatus, and more particularly to a baking apparatus having a centering device for adjusting a position so that a nozzle for injecting hot air into a quartz tube is exactly aligned with the center of the quartz tube.

In general, a flat panel display is classified into a light emitting type and a light receiving type. A light emitting type includes a cathode ray tube, an electroluminescent (EL) element, a plasma display panel (PDP), and the like. The light receiving type includes a liquid crystal display (LCD) and the like.

Since the light receiving display device itself emits light and does not form an image, but receives light from the outside to form an image, a separate light source, for example, a backlight, must be provided.

Fluorescent lamps used for backlights include cold cathode fluorescent lamps (CCFLs) in which both electrodes are installed inside the tube, and external electrode fluorescent lamps (EEFL) in which both electrodes are installed outside the tube.

Cold cathode fluorescent lamps are coated with a protective film and fluorescent material on the inner surface of the bulb (glass tube), baked at a high temperature, and installed at both ends of the bulb to be sealed through a vacuum exhaust process, and a certain amount of mercury and argon in the inner space. When a high voltage is applied to the electrodes provided at both ends by filling a mixed gas such as (Ar) and neon (Ne), ultraviolet rays are emitted as mercury is excited by the electron emission by an electric field from the electrodes, and the emitted ultraviolet rays are fluorescent materials. Is converted into visible light and irradiated with light, and electrons are not emitted by heat, but heat is not required by an electron emission method by an electric field.

Cold cathode fluorescent lamps have been used in various fields because of their low power consumption, long life, high brightness and local lighting.

In order to manufacture such a cold cathode fluorescent lamp, a process of coating a fluorescent material inside the bulb and baking the same by a baking apparatus is required. Since the bulb is a very thin and thin glass tube, the bulb is rotated to evenly transfer heat when the bulb is heated using a heater. However, at this time, the bulb is easily broken.

Thus, the bulb is inserted into the quartz tube and heated while rotating. Then, breakage of the bulb can be prevented. Usually, the process is performed by inserting 2 to 4 bulbs into one quartz tube.

When the bulb inserted into the quartz tube is heated in the baking process, impure gases and by-products are generated from the bulb, and hot air must be blown out into the quartz tube.

To this end, a nozzle that generates hot air is inserted into a quartz tube. The chain that rotates the quartz tube is stretched by the heat of the heater, and the nozzle operates eccentrically inside the quartz tube, so that the quartz tube is broken or the by-products are There is a problem that bad baking does not come out and product characteristics are bad.

An object of the present invention is to provide a baking apparatus having a centering unit capable of matching the position of the hot air supply nozzle and the quartz tube to remove impurities generated in the quartz tube during the baking process.

In the baking apparatus for baking a bulb coated with a fluorescent material is inserted into a quartz tube according to an embodiment of the present invention for achieving the technical problem using a heater, and supports both ends of the quartz tube is inserted into the bulb Rotating support portion for rotating the quartz tube to be heated by the heater while rotating the quartz tube, is disposed inside the rotation support portion, by raising the quartz tube by a predetermined height hot air (hot air) to the inside of the quartz tube A centering part for allowing the hot air supply nozzle to be accurately centered, a driving part for raising and lowering the centering part and rotating the centering part so as to rotate the quartz tube mounted on the centering part and both ends of the quartz tube; It is disposed on one side of the rotary support for supporting the hot air to supply the hot air to the quartz tube And a hot air supply unit in which a plurality of fish supply nozzles are arranged.

It is further provided with a heat insulating plate disposed between the heater and the centering portion to block the heat generated from the heater to the driving unit. The centering part rotates at the same speed as the rotation support part.

The centering unit is provided symmetrically to each other on both sides of the heater, the body frame facing each other, a plurality of are arranged in a row between the body frame, a rotating shaft is formed at one end and a gear is formed at the other end, And a chain connected to the gear to rotate the rotary shaft by the drive unit.

The driving part includes an up-down part for raising and lowering the centering part, and a magnetizing part for rotating the rotating shaft of the centering part to rotate the quartz tube, and the up-down part is mounted to the lower part of the body frame by the LM guide. An up-down unit for moving the body frame up and down, a plurality of cams for moving the up-down unit up and down at the bottom of the up-down unit, a cam driving motor for rotating the cams, connected to the cam driving motor, respectively provided on both sides of the heater And a shaft that transmits the same rotational force to the cams so that the centering portion is simultaneously raised and lowered.

The rotating part is connected to the chain of the centering part under the body frame, and includes a plurality of sprockets for rotating the chain and a rotating motor connected to the chain by rotating the sprockets.

The rotating unit may further include a tension unit mounted to the up-down unit to adjust the tension of the chain when the up-down unit is raised and lowered, and the tension unit may be fixed to the first fixing unit and the first fixing unit fixed to the up-down unit. One end is fixed to the other end is provided with a spring portion is connected to the chain sprocket for adjusting the tension of the chain.

The baking apparatus further includes a loading unit for inserting the bulb into the quartz tube, a transfer unit for horizontally transferring the quartz tube, and an unloading unit for drawing out the bulb that has been heated inside the quartz tube.

In the baking apparatus according to another embodiment of the present invention for achieving the technical problem, in the baking apparatus for baking a bulb coated with a fluorescent material using a quartz tube using a heater, inserting the bulb into the quartz tube. A loading unit, a transfer unit for horizontally transferring the quartz tube, a rotation support unit for supporting both ends of the quartz tube transferred by the transfer unit and rotating the quartz tube while allowing the quartz tube to be heated by the heater; A centering part disposed at an inner side of the center tube to raise the quartz tube by a predetermined height so that a hot air supply nozzle for supplying hot air to the inner side of the quartz tube can be accurately centered; The centering part is the same as the rotation support part so that the quartz tube mounted on the centering part rotates up and down and rotates. A drive unit rotating at a speed, a heat insulation plate disposed between the heater and the centering unit to block heat generated from the heater from being applied to the drive unit, and disposed on one side of the rotation support unit supporting both ends of the quartz tube, And a hot air supply unit in which a plurality of hot air supply nozzles for supplying hot air to the quartz tube are arranged, and an unloading unit for drawing out the bulb that has been heated inside the quartz tube.

As described above, the baking apparatus according to the embodiment of the present invention has a centering part, so that the center of the quartz tube can be accurately aligned with the nozzle for supplying hot air to the quartz tube, thereby solving the problem of the quartz tube being broken. Cost reduction due to the removal of the cause of the tube breakage, and by effectively removing impurities in the quartz tube has the advantage of improving the reliability of the bulb characteristics.

In addition, by installing a heat insulating plate to block the heat generated from the heater there is an advantage that can effectively prevent the problem that the peripheral device such as the drive device is deformed by the heat.

DETAILED DESCRIPTION In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

1 is a plan view of a baking apparatus according to an embodiment of the present invention. Referring to FIG. 1, the baking apparatus 100 according to the embodiment of the present invention includes a rotation support unit 110, a centering unit 130, a driving unit 150, and a hot air supply unit 170.

The rotary support 110 supports both ends of the quartz tube QZ in which the bulb BB is inserted, and the quartz tube QZ is heated by the heater 120 while rotating the quartz tube QZ. The centering unit 130 is disposed inside the rotation support unit 110, and the hot air supply nozzle for supplying hot air to the inside of the quartz tube QZ by raising the quartz tube QZ by a predetermined height. Ensure that (NZ) is centered correctly.

The driving unit 150 raises and lowers the centering unit 130 and rotates the centering unit 130 to rotate the quartz tube QZ mounted on the centering unit 130. The hot air supply unit 170 is disposed at one side of the rotation support unit 110 that supports both ends of the quartz tube QZ, and a plurality of hot air supply nozzles NZ for supplying hot air to the quartz tube QZ are disposed. do.

Rotating support 110 is provided on both sides of the heater 120 to support both ends of the quartz tube (QZ). The rotary support 110 supports a lower portion of the quartz tube QZ and is provided with a plurality of rotating rollers (not shown) for rotating the quartz tube, and the rotating rollers are connected to a sprocket (not shown) and rotated by a chain. The chain is rotated by the drive motor M1, and the rotational support 110 provided on both sides of the heater 120 is synchronized to rotate at the same speed.

The quartz tube QZ is mounted on the rotating rollers of the rotary support 110 and rotated, and is heated by the heater 120. Since the structure and operation of the rotation support 110 can be understood by those skilled in the art, a detailed description thereof will be omitted.

In the baking apparatus 100 of the present invention, when the hot air supply nozzle NZ of the hot air supply unit 170 is inserted into the quartz tube, the quartz tube QZ is raised by slightly raising the quartz tube QZ (about 10 mm to 15 mm). Ensure that the hot air supply nozzle (NZ) is correctly inserted into the center of the To this end, a centering unit 130 is provided which raises and lowers both ends of the quartz tube QZ. The rise and fall of the centering unit 130 is performed by the driving unit 150.

The baking apparatus 100 is heated in the loading unit 191 for inserting the bulb BB into the quartz tube QZ, and the transfer unit (not shown) and the quartz tube QZ for horizontally transferring the quartz tube QZ. An unloading part 193 for taking out the completed bulb BB is further provided.

The transfer unit (not shown) is disposed below the rotary support unit 110, and moves the quartz tube QZ in the direction of the unloading unit 193 by repeating the operation of lifting and transporting the quartz tube QZ and lowering again. Since the structure and operation of the loading unit 191, the transfer unit (not shown) and the unloading unit 193 can be understood by those skilled in the art, a detailed description thereof will be omitted.

FIG. 2 is a plan view illustrating a structure of the centering part of FIG. 1.

The centering unit 130 is provided symmetrically on both sides of the heater 120. That is, the centering unit 130 is disposed in the inner side of the rotary support 110 disposed on both sides of the heater, that is, one pair each in the direction of the heater, the quartz tube (QZ) by raising a predetermined height to the inside of the quartz tube (QZ) This ensures that the hot air supply nozzle (NZ) that supplies hot air can be accurately centered.

As shown in FIG. 2, a plurality of centering units 130 are disposed in a line between the body frames BD and the body frames BD that face each other, and a rotating roller 210 is formed at one end and the other end thereof. It is provided with a rotating shaft 230, the gear 220 is formed, a chain 240 connected to the gear 220 to rotate the rotating shaft 230 by the driving unit 150.

Here, although FIG. 2 illustrates that the gear 220 is formed at the other end of the rotation shaft 230 and the gear 220 is connected to the chain 240, the structure of the centering unit 130 is the gear 220 and the chain. The method is not limited to the 240 method, and various rotation methods may be used. For example, a belt or the like, and a person skilled in the art will understand that the structure of the centering unit 130 is not limited to the structure described in the claims.

The driving unit 150 driving the centering unit 130 rotates the up-down unit 300 for raising and lowering the centering unit 130 and the rotation shaft 230 of the centering unit 130 to rotate the quartz tube QZ. The rotating part 500 is provided.

3 is a front view illustrating an up-down part of the driving part of FIG. 1.

4 is a side view illustrating an up-down part of the driving unit of FIG. 1.

3 and 4, the up-down unit 300 includes an up-down unit 310, cams 320, a cam driving motor M2, and a shaft SFT. The up-down unit 310 is mounted on the lower portion of the body frame BD to move the body frame BD up and down by the LM guide 313. Here, the up and down movement of the up-down unit 310 is guided by the LM guide 313, but is not limited to the LM guide, any device that can guide the up and down linear movement is possible.

3 shows only a part of the up-down unit 310, the up-down unit 310 as shown in FIG. 3 so as to support the body frame BD of the centering unit 130 corresponding to the length of the centering unit 130. ) Are arranged under the body frame BD in series.

In addition, the up-down unit 310 moves up and down by cams 320 which are rotated by the cam driving motor M2. That is, the cams 320 vertically move the up-down unit 310 by the rotation of the cam driving motor M2 at the bottom of the up-down unit 310. 3, only one cam for raising and lowering the up-down unit 310 is shown, but a plurality of cams may be provided.

The cam driving motor M2 and the cam 320 are connected by the coupling 321, and the rotation of the cam 320 is changed by the cam roller 323 to the vertical movement of the up-down unit 310. The operation of such a cam can be understood by those skilled in the art, so a detailed description thereof will be omitted.

In addition, as well as the cams 320, any device capable of vertically moving the up-down unit 310 may be used in various ways. For example, a linear unit may be used instead of the plurality of cams 320. Those skilled in the art will appreciate that the structure capable of vertically moving the up-down unit 310 is not limited to the structure described in the claims.

Since the centering unit 130 is disposed on both sides with respect to the heater 120, the centering unit 130 provided at both sides should be raised and lowered at the same time. The shaft SFT is connected to the cam driving motor M2, and transmits the same rotational force to the cams so that the centering units 130 provided on both sides of the heater 120 may simultaneously move up and down.

As shown in FIG. 1, the shaft SFT starts from the cam driving motor M2 and is installed to transmit rotational force to the centering part 130 on the opposite side of the heater 120 by the bevel gear G1. .

FIG. 5 is a front view illustrating a rotating unit of the driving unit of FIG. 1.

FIG. 6 is a side view illustrating a rotating unit of the driving unit of FIG. 1.

5 and 6, the rotating part 500 is connected to the chain 240 of the centering part 130 under the body frame BD, and a plurality of sprockets 510 for rotating the chain 240. ) And a sprocket 510 is rotated and has a rotating motor M3 connected to the chain 240.

5 and 6, the gears 220 of the rotation shaft 230 are connected to the chain 240 to rotate the rotation shaft 230 of the centering unit 130. And the sprockets 510 are disposed on the side of the up-down unit 310 under the body frame BD to move the chain 240. The sprockets 510 are arranged in a long line, connected to the chain 240, and the chain 240 is connected to the rotating motor M3. The shaft SFT is also connected to the rotating motor M3 to transmit rotational force to sprockets (not shown) on the opposite side of the rotating motor M3 so that the rotating shafts of the respective centering parts on both sides of the heater 120 are at the same speed. Rotate

The rotating motor M3 is connected to the sprockets 510 through an adjusting device 550 for adjusting the tension (or tension) of the chain 240. In addition, the rotating unit 500 is further provided with a tension unit 530 is mounted on the up-down unit 310 to adjust the tension of the chain 240 when the up and down unit 310 is raised and lowered.

The tension unit 530 prevents the chain between the sprockets 510 from sagging or excessively tensioned when the up-down unit 310 is raised or lowered.

The tension part 530 has one end fixed by the first fixing part 531 and the first fixing part 531 fixed to the up-down unit 310, and the chain sprocket 533 for adjusting the tension of the chain 240 at the other end. ) Is provided with a spring portion 535 to which it is connected. The spring unit 535 may be any device having an elastic force in addition to the spring. The chain sprocket 533 is directly connected to the chain 240 to rotate the chain 240 and at the same time adjust the tension of the chain 240 when the up-down unit 310 is raised or lowered by the lower spring portion 535. do.

The centering part 130 rotates at the same speed as the rotation support part 110. To this end, the rotational speeds of the driving motor M1 for driving the rotation support part 110 and the rotation motor M3 of the rotating part 500 for rotating the centering part 130 are the same. Making the rotational speed of the driving motor M1 and the rotating motor M3 the same is performed by a motor control device (not shown), and thus a detailed description thereof will be omitted.

Referring to FIG. 1, a heat insulation plate 190 is disposed between the heater 120 and the centering unit 130 to block heat generated from the heater 120 from affecting the driving unit 150. Heat generated from the heater 120 affects the mechanism and the driving unit 150 including the chain of the centering unit 130 or the rotation support unit 110 on the left and right sides of the heater 120 and the chain is stretched or the motor is deteriorated. Problems may occur. Therefore, the insulation plate 190 may be provided to primarily block heat transfer of the heater 120 directly by convection.

The structure of the baking apparatus 100 according to the embodiment of the present invention has been described above. Hereinafter, the operation of the baking apparatus according to the embodiment of the present invention will be described in detail with reference to FIGS. 1 to 7.

The bulb BB is supplied to the quartz tube QZ through the loading unit 191, and the quartz tubes are transferred by the transfer unit (not shown) and placed on the rotary support 110. The quartz tube QZ rotates on the rotation support part 110 by the driving motor M1 and is heated by the heater 120.

The up-down unit 310 of the driving unit 150 rises up by the cam driving motor M2, and the centering unit 130 disposed above the up-down unit 310 also rises up. Then, the quartz tubes QZ rotating in the rotation support part 110 are mounted on the rotating roller 210 of the centering part 130 to rise upward. The rotating roller 210 is rotating at the same speed as the rollers (not shown) of the rotation support part 110 by the chain 240 rotated by the rotating motor M3 and the sprocket 510. Therefore, the quartz tube QZ rotates at the same speed while being moved from the rotation support part 110 to the centering part 130, so that the quartz tube QZ can rise naturally without any other impact.

When the centering unit 130 rises, the hot air supply nozzles NZ of the hot air supply unit 170 are advanced and inserted into the quartz tube QZ. At this time, since the quartz tube QZ is raised to the correct position so that the hot air supply nozzle NZ is positioned at the center of the quartz tube QZ by the centering unit 130, the hot air supply nozzle NZ is exactly a quartz tube. Hot air may be ejected from the center of QZ to remove impurities in the quartz tube.

7 is a view for explaining a hot air supply nozzle operating in a quartz tube.

FIG. 7 (a) illustrates a state in which a hot air supply nozzle NZ inserted into a quartz tube QZ is deflected instead of being centered in a conventional baking apparatus. Since the hot air supply nozzle NZ is biased in one direction, the hot air supply nozzle NZ is likely to be damaged by hitting the inner wall of the quartz tube QZ. In addition, since hot air is ejected in the deflected direction, impurities in the quartz tube QZ are hard to be completely removed.

FIG. 7 (b) shows that the quartz tube QZ is raised by the centering unit 130 in the baking apparatus 100 according to the embodiment of the present invention, so that the hot air supply nozzle NZ is centered inside the quartz tube QZ. Explain the case in which Even if the quartz tube QZ rotates, there is no risk of the hot air supply nozzle NZ hitting the outer wall of the quartz tube QZ. Can be.

When the hot air is ejected and the internal impurities of the quartz tube QZ are removed, the hot air supply nozzle NZ retreats. Then, the up-down unit 310 of the driving unit 150 is lowered by the cam driving motor M2, the centering unit 130 is also lowered, and the quartz tube QZ is mounted on the rotation support unit 110 again.

Then, the quartz tubes are moved to the side by the transfer unit (not shown), and the bulb BB in the quartz tube QZ is discharged through the unloading unit 193.

In this baking process, the heat insulating plate 190 is a mechanical device (drive motor M1, cam drive motor M2 and rotating motor M3, etc.) in which heat generated from the heater 120 is disposed on the side of the heater. To prevent transmission by convection or radiation. It is then possible to effectively prevent deformation of the mechanical mechanism by heat, thereby preventing deformation and breakage of the mechanical mechanisms.

Baking apparatus according to another embodiment of the present invention for achieving the above technical problem, relates to a baking device for baking a bulb coated with a fluorescent material using a quartz tube using a heater, inserting the bulb into the quartz tube A loading unit, a transfer unit for horizontally transferring the quartz tube, a rotation support unit for supporting both ends of the quartz tube transferred by the transfer unit and rotating the quartz tube while allowing the quartz tube to be heated by the heater; A centering part disposed at an inner side of the center tube to raise the quartz tube by a predetermined height so that a hot air supply nozzle for supplying hot air to the inner side of the quartz tube can be accurately centered; The centering part is moved with the rotation support part to raise and lower the part and rotate the quartz tube mounted on the centering part. A driving unit rotating at one speed, a heat insulating plate disposed between the heater and the centering unit to block heat generated from the heater from being applied to the driving unit, and disposed on one side of the rotating support unit supporting both ends of the quartz tube. And a hot air supply unit in which a plurality of hot air supply nozzles for supplying hot air to the quartz tube are arranged, and an unloading unit for drawing out the bulb in which the heating is completed in the quartz tube.

Since the structure and operation of the baking apparatus according to another embodiment of the present invention are the same as the baking apparatus 100 according to the above-described embodiment, a detailed description thereof will be omitted.

As described above, optimal embodiments have been disclosed in the drawings and the specification. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the drawings cited in the detailed description of the invention, a brief description of each drawing is provided.

1 is a plan view of a baking apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view illustrating a structure of the centering part of FIG. 1.

3 is a front view illustrating an up-down part of the driving part of FIG. 1.

4 is a side view illustrating an up-down part of the driving unit of FIG. 1.

FIG. 5 is a front view illustrating a rotating unit of the driving unit of FIG. 1.

FIG. 6 is a side view illustrating a rotating unit of the driving unit of FIG. 1.

FIG. 7 (a) is a view for explaining a hot air supply nozzle inserted into an existing quartz tube.

Figure 7 (b) is a view illustrating a hot air supply nozzle inserted into the quartz tube according to an embodiment of the present invention.

Claims (13)

A baking apparatus for baking a bulb coated with a fluorescent material inserted into a quartz tube using a heater, A rotation support part supporting both ends of the quartz tube into which the bulb is inserted and allowing the quartz tube to be heated by the heater while rotating the quartz tube; A centering unit disposed inside the rotatable support and configured to raise the quartz tube by a predetermined height so that a hot air supply nozzle for supplying hot air into the quartz tube can be accurately centered; A driving unit which raises and lowers the centering unit and rotates the centering unit so that the quartz tube mounted on the centering unit rotates; And And a hot air supply unit disposed at one side of the rotation support unit supporting both ends of the quartz tube, the hot air supply nozzle having a plurality of hot air supply nozzles for supplying hot air to the quartz tube. The method of claim 1, And a heat insulating plate disposed between the heater and the centering unit to block heat generated from the heater from affecting the driving unit. The method of claim 1, wherein the centering unit, Baking apparatus, characterized in that for rotating at the same speed as the rotation support. The method of claim 3, wherein the centering unit, It is provided symmetrically with each other on both sides of the heater, Body frames facing each other; A plurality of rotation shafts arranged in a row between the body frames, and a rotating roller formed at one end thereof and a gear formed at the other end thereof; And a chain connected to the gear to rotate the rotating shaft by the driving unit. The method of claim 4, wherein the driving unit, An up-down part for raising and lowering the centering part; And Rotating the rotating shaft of the centering portion is provided with a magnet to rotate the quartz tube, The up-down part, An up-down unit mounted at a lower portion of the body frame to vertically move the body frame by an LM guide; A plurality of cams for vertically moving the up-down unit below the up-down unit; A cam driving motor for rotating the cams; And a shaft which is connected to the cam driving motor and transmits the same rotational force to the cams so that the centering portions respectively provided on both sides of the heater are raised and lowered at the same time. The method of claim 5, wherein the rotating unit, A plurality of sprockets connected to the chain of the centering portion below the body frame and configured to rotate the chain; And And a rotating motor connected to the chain while rotating the sprockets. The method of claim 6, wherein the rotating unit, And a tension unit mounted on the up-down unit to adjust the tension of the chain when the up-down unit is raised and lowered. The tension unit, A first fixing part fixed to the up-down unit; And And a spring portion having one end fixed by the first fixing part and a chain sprocket connected to the other end to adjust the tension of the chain. The method of claim 1, A loading unit for inserting the bulb into the quartz tube; A transfer unit for horizontally transferring the quartz tube; And And an unloading part for drawing out the bulb in which the heating is completed in the inside of the quartz tube. A baking apparatus for baking a bulb coated with a fluorescent material inserted into a quartz tube using a heater, A loading unit for inserting the bulb into the quartz tube; A transfer unit for horizontally transferring the quartz tube; A rotation support part supporting both ends of the quartz tube conveyed by the conveying unit and rotating the quartz tube while being heated by the heater; A centering unit disposed inside the rotatable support and configured to raise the quartz tube by a predetermined height so that a hot air supply nozzle for supplying hot air into the quartz tube can be accurately centered; A driving unit which raises and lowers the centering unit and rotates the centering unit at the same speed as the rotation support unit such that the quartz tube mounted on the centering unit rotates;  An insulation plate disposed between the heater and the centering unit to block heat generated from the heater from affecting the driving unit; A hot air supply unit disposed at one side of the rotation support unit for supporting both ends of the quartz tube and having a plurality of hot air supply nozzles for supplying hot air to the quartz tube; And And an unloading part for drawing out the bulb in which the heating is completed in the inside of the quartz tube. The method of claim 9, wherein the centering unit, It is provided symmetrically with each other on both sides of the heater, Body frames facing each other; A plurality of rotation shafts arranged in a row between the body frames, and a rotating roller formed at one end thereof and a gear formed at the other end thereof; And a chain connected to the gear to rotate the rotating shaft by the driving unit. The method of claim 10, wherein the driving unit, An up-down part for raising and lowering the centering part; And Rotating the rotating shaft of the centering portion is provided with a magnet to rotate the quartz tube, The up-down part, An up-down unit mounted at a lower portion of the body frame to vertically move the body frame by an LM guide; A plurality of cams for vertically moving the up-down unit below the up-down unit; A cam driving motor for rotating the cams; And a shaft which is connected to the cam driving motor and transmits the same rotational force to the cams so that the centering portions respectively provided on both sides of the heater are raised and lowered at the same time. The method of claim 11, wherein the rotating unit, A plurality of sprockets connected to the chain of the centering portion below the body frame and configured to rotate the chain; And And a rotating motor connected to the chain while rotating the sprockets. The method of claim 12, wherein the rotating unit, And a tension unit mounted on the up-down unit to adjust the tension of the chain when the up-down unit is raised and lowered. The tension unit, A first fixing part fixed to the up-down unit; And And a spring portion having one end fixed by the first fixing part and a chain sprocket connected to the other end to adjust the tension of the chain.

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