WO2013002525A2

WO2013002525A2 - Device for removing cracks from cut corners of glass plate

Info

Publication number: WO2013002525A2
Application number: PCT/KR2012/005011
Authority: WO
Inventors: 박재훈
Original assignee: 에이그라스 주식회사
Priority date: 2011-06-30
Filing date: 2012-06-26
Publication date: 2013-01-03
Also published as: KR101265499B1; KR20130003237A; WO2013002525A3

Abstract

The present invention pertains to a device for machining a cut corner of a thin glass plate, and more specifically to a device for removing fine cracks formed at cut corners of a glass plate. The device for removing the cracks of the corners of a glass plate according to the present invention comprises: a burner for melting the cut corners of a glass plate; a combustion gas supply means for supplying combustion gas to the burner; and a rotary vacuum adsorption gripper for gripping the glass plate such that the glass plate approaches the burner. The burner comprises a flame throwing surface, and a plurality of flame throwing holes which are formed on the flame throwing surface and disposed such that virtual lines connecting neighboring flame throwing holes form at least one single closed loop. The rotary vacuum adsorption gripper includes a rotation shaft which is disposed in parallel to the flame throwing surface of the burner, and a vacuum adsorption arm of which one end is fixed to the rotation shaft and the other end is formed with an adsorption surface. The vacuum adsorption arm is mounted such that one surface of the glass plate faces the flame throwing surface of the burner, wherein the glass plate is adsorption-gripped at a set position when the rotation shaft rotates. The rotary vacuum adsorption gripper is more preferable than a plurality of vacuum adsorption arms to improve productivity. In addition, the adsorption surfaces of a plurality of vacuum adsorption arms are respectively vacuumed in a vacuum adsorption section and vacuum released in a vacuum release section with respect to one cycle of the rotation shaft.

Description

Cutting edge crack remover on glass sheet

This invention relates to the cutting edge processing apparatus of thin glass. More particularly, the present invention relates to an apparatus for removing fine cracks formed at the cut edges of a glass plate.

Display devices are used in electronic devices such as smartphones, tablet PCs, and TVs. Thin glass is used as the substrate of the LCD display device among the display devices. In addition, thin glass is used also as a window panel for protecting the display part of a display apparatus. Also, thin glass is used in the touch sensor device. In order to manufacture thin glass used for various electronic devices as described above, a process of cutting a large glass plate is essential.

In general, as a method of cutting a glass plate, a method of forming a scribing line first rather than completely cutting the glass to make a mechanically weak part, and breaking by applying a physical or thermal shock to the weak part. Moreover, the waterjet cutting method which cuts by the pressure of water is known. When braking by applying a physical or thermal shock to the glass plate, the glass is hard and susceptible to mechanical impact, so that minute cracks are generated at the cut edges. When the glass is reinforced without removing the fine cracks generated at the cut edges of the glass plate, there is a fear that the minute cracks progress and the glass plate itself is broken as time passes.

In order to prevent breakage of the glass plate due to such fine cracks, the edges are chamfered after not only removing the fine cracks formed at the cutting edges but also cutting the cutting surfaces to remove sharp edges. Use tools such as diamond wheels for grinding or polishing to cut edges or to chamfer edges.

Fine glass particles are generated when grinding and polishing the cut edges of thin glass cut to a predetermined size using a grinding and polishing tool. In order to remove the generated fine glass particles remaining in the thin glass, a separate washing and drying process is required after the chamfering and chamfering process to increase the manufacturing cost. In addition, in order to prevent scratches on the surface of the glass plate, a process of attaching a protective film on both sides or a single side is processed, and a process of removing the protective film after processing may be added. Further, even when the cutting edges are ground or polished, fine cracks deeply advanced may not be removed, or second cracks may be generated in the thin glass due to the impact of the rotating tool during grinding or polishing. In addition, there is a problem that damage the expensive equipment when the generated fine glass particles invade the manufacturing equipment.

The present invention relates to a method and apparatus for fundamentally solving the problems arising in the conventional process of removing cracks generated in the cut edges of thin glass cut to a predetermined size as described above. It is an object of the present invention to provide a method and apparatus capable of completely removing fine cracks formed at the cut edges of a glass plate. It is also an object of the present invention to provide a method and apparatus capable of removing cracks formed at the cut edges of a glass plate without generating fine glass particles during crack removal. It is also an object of the present invention to provide a crack removal method and apparatus in which secondary cracking does not occur due to mechanical impact during crack removal.

The cutting edge crack removal apparatus of the glass plate according to the present invention includes a burner for melting the cutting edge of the glass plate, combustion gas supply means for supplying combustion gas to the burner, and rotary vacuum adsorption for holding the glass plate to approach the burner. Contains a gripper. The burner includes a flame radiation surface and a plurality of flame radiation holes formed on the flame radiation surface and arranged such that a virtual line connecting adjacent flame radiation holes is at least one single closed curve. The rotary vacuum suction gripper includes a rotary shaft disposed in parallel with the flame emitting surface of the burner, and a vacuum suction arm having one end fixed to the rotary shaft and having a suction surface at the other end. The vacuum suction arm is sucked at a predetermined position when the rotary shaft rotates. One surface of the gripped glass plate is installed to face the flame radiation surface of the burner. The rotary vacuum suction gripper is more preferably provided with a plurality of vacuum suction arms in order to improve productivity. In addition, the suction surfaces of the plurality of vacuum suction arms each take a vacuum in the vacuum suction section for one rotation of the rotating shaft and release the vacuum in the vacuum release section. The rotating shaft absorbs the glass plate at the predetermined position (rotation angle), the second vacuum suction arm closes the adsorbed glass plate to the burner to remove the cutting edge crack, and the third vacuum suction arm removes the crack. The rotation is stopped for a certain time to release the glass plate. When four vacuum suction arms are installed on the rotary shaft, each vacuum suction arm is placed in the vacuum suction section at the first and second positions where the rotary shaft temporarily stops with respect to one rotation of the rotary shaft. In the fourth position, it belongs to the vacuum releasing section.

In order to provide a vacuum to the suction face of the vacuum suction arm when the rotary shaft rotates, a plurality of vacuum passage inlets corresponding to the respective vacuum suction arms are formed on the outer circumferential surface of the rotary suction arm, and from each vacuum passage inlet to the inside of the rotary shaft. A plurality of vacuum passages are formed to extend and communicate with the suction surfaces of the respective vacuum suction arms. The rotary shaft housing further includes a rotary shaft housing for supporting the rotary shaft, and a vacuum chamber connected to the vacuum source and a vacuum release chamber in communication with the atmosphere are formed on an opposite surface of the rotary shaft housing opposite to each vacuum passage inlet of the rotary shaft. In addition, the outer circumferential surface of the rotary shaft around each vacuum passage inlet is rotated in close contact with the rotating shaft housing. When each vacuum suction arm is positioned in the vacuum suction section during rotation of the rotary shaft, the corresponding vacuum passage inlet communicates with the vacuum chamber. When each vacuum suction arm is located in the vacuum release section, the corresponding vacuum passage inlet is configured to communicate with the vacuum release chamber.

In addition, the rotary vacuum suction gripper is configured to maintain a distance between the flame emitting surface and the glass plate such that the cutting edge contour of the glass plate vacuum-adsorbed to the vacuum suction arm is in direct contact with the flame radiated from the flame radiating hole of the burner. The flame radiating surface of the burner is disposed in parallel and spaced apart at a predetermined distance to face the first surface of the glass plate, and the plurality of flame radiating holes correspond to at least one cut edge of the glass plate when connecting adjacent flame radiating holes with an imaginary line. Is formed on the flame-radiation surface to form a single closed curve of the. When only a part of the cutting edge is heated by using a burner having a flame radiating surface and a plurality of flame radiating holes, the rotary vacuum suction gripper is arranged so that the first surface of the plate glass is spaced a predetermined distance from the flame radiating surface of the burner. The cutting edges are locally heated by directing the flames emitted from the flame-emitting holes of the direct contact with the cutting edges of the pane.

The direction of contacting the flame at the cut edge to heat the cut edge is not limited. For example, the flame may be brought into contact with the cutting edge by directing the flame from the lower part of the glass plate to the upper part, or the flame may be brought into contact with the cut edge by directing the flame from the upper part of the glass plate to the lower part. It is also possible to direct the flame inclined to the cut surface so that the flame contacts the cut edge. However, the glass plate is arranged such that the first surface of the glass plate faces the direction opposite to the direction in which gravity acts so that the glass of the first surface cut edge melted by the flame flows on the cutting surface in a direction away from the first surface by gravity. And it is preferable to arrange | position the flame-emitting surface of a burner toward a 1st surface.

In addition, the orthogonal projection on the glass plate of the virtual single closed curve connecting the center of each of the plurality of flame-emitting holes is preferably arranged outside the cut surface of the cutting edge of the corresponding glass plate. This is to place the center of the flame radiation hole on the outside of the cut surface, so that the center of the flame radiated from the flame radiation hole is radiated out of the glass plate, so that the side of the flame is in contact with the cutting edge of the glass plate and the cut surface.

In addition, the flame radiation hole can be implemented in various shapes. For example, a slit shape having a width in the range of 0.1 to 2 mm or a circular hole having a diameter in the range of 0.1 to 2 mm may be formed as a flame spinning hole. In addition, the spacing between neighboring flame-emitting holes is properly adjusted in the range of 3-50 mm in proportion to the diameter of the flame-emitting holes so that flames emitted from neighboring flame-emitting holes can be continuously contacted without gaps along the cutting edge of the glass plate. do. In addition, the spacing between the glass plate and the flame emitting surface is preferably such that the oxidized salt and the reducing salt of the flame are in direct contact with the cut edge and the cut surface of the glass plate.

In addition, by adjusting the size of the flame, and the distance between the glass plate and the flame emitting surface, it is possible to remove the cracks formed on the cutting edge of the upper surface and the cutting edge of the lower surface of the glass plate at a time. That is, the burner and the glass plate are brought into direct contact with the cutting edge defining the second surface located opposite the first side of the glass plate and the cutting edge defining the flame radiating from the flame radiating hole of the burner at the same time. To place. In addition, the combustion gas for generating a flame uses a combustion gas containing LNG, LPG or acetylene gas and oxygen.

According to the present invention, as the rotary vacuum suction gripper rotates with the rotation of the rotary shaft, each vacuum suction arm is vacuumed at the first position to suck and hold the glass plate, and the glass plate is cut by the flame radiated from the burner at the second position. The glass plate is brought into close proximity to the flame-radiating surface so that the edges are in direct contact with each other, and the cutting edge can be removed, and the vacuum is released at the third position to release the gripped glass plate, thereby automating the cutting edge crack removal process to improve productivity.

In addition, the cutting edge crack removal apparatus of the glass plate according to the present invention, the supply conveyor for continuously supplying the glass plates to the rotary vacuum suction gripper, the discharge conveyor for continuously discharging the glass plates provided from the rotary vacuum suction gripper, and on the supply conveyor It is preferred to include preheating means for preheating the moving glass plate and cooling means for cooling the glass plates moving on the discharge conveyor.

The preheating temperature of a glass plate should just be in the range of 500 degreeC-630 degreeC which is the temperature range near the annealing of glass, and it is good to preheat to about 600 degreeC. Preheating before the crack is melted and removed by flame is to prevent breakage of the glass plate due to thermal stress due to rapid temperature change. Residual strain is present at the cut edges where the crack is removed by flames. In order to remove it, annealing operation is necessary during slow cooling. The cooling rate is preferably maintained at a rate of 14-18 ° C./min up to 350 ° C. and at a rate of 56 ° C.-62 ° C./min from 350 ° C. to room temperature. The supply conveyor and the preheating means continuously preheat the glass plate to supply the rotary vacuum suction gripper, and the discharge conveyor and the cooling means continuously cool the glass plate from which the cutting edge cracks are removed, thereby increasing productivity.

In addition, shortening the length of the conveyor, increasing the area of the glass plate in contact with the air, reducing preheating and cooling time, and feeding and discharging the glass plate on the conveyor so as to easily adsorb the glass plate with the rotary vacuum suction gripper. desirable. In order to transport the glass plate upright on the conveyor, it is possible to install a plurality of holders with slits for supporting the glass plate upright on the supply conveyor and the discharge conveyor, respectively. Also, by synchronizing the operation of the rotary vacuum suction gripper with the supply conveyor and the discharge conveyor, the first arm absorbs and grips the glass plate, while the second arm heats the glass plate from the burner, and the second arm removes the cutting edge crack. The glass plate can be placed on the discharge conveyor to increase productivity.

On the other hand, when the glass plate inserted into the slit of the holder is sucked and gripped by the vacuum suction arm of the rotary vacuum suction gripper and immediately inserted into the holder, the glass plate is caught by the slit and broken. Therefore, it is preferable to install the rotary vacuum suction gripper so that the rotary vacuum suction gripper can be moved up and down a certain distance so that the rotary vacuum suction gripper can be rotated after the glass plate is removed from the slit of the holder. In addition, it is necessary to install the rotary vacuum adsorption gripper to move up and down a certain distance in order to insert the glass plate from which the cutting edge crack is removed in the slit of the glass plate holder installed in the discharge conveyor.

In addition, the preheating means is installed extending in the longitudinal direction in the upper portion of the supply conveyor, the first preheating air passage closed at one end and installed in the position adjacent to the first preheating air passage extending in the longitudinal direction and closed at one end. The second preheated air passage, the first heater connected to the other end of the first preheated air passage, the first blower for supplying air to the first heater, and the other end of the second preheated air passage to supply external air And a second blower for forming a plurality of through-holes along the longitudinal direction of the lower surface facing the supply conveyor of the first preheating air passage, wherein the first preheating air passage and the second preheating air passage are arranged in the longitudinal direction. Therefore, it can be comprised so that it may communicate with each other in multiple positions. In addition, the cooling means is installed in the upper part of the discharge conveyor is extended in the longitudinal direction and one end is closed and installed in the position adjacent to the first cooling air passage extending in the longitudinal direction and one end is closed. The second cooling air passage, the second heater connected to the other end of the first cooling air passage, the third blower for supplying air to the second heater, and the other end of the second cooling air passage. And a fourth blower for supplying, the lower surface of the first cooling air passage facing the discharge conveyor is formed with a plurality of through holes in the longitudinal direction, and the first cooling air passage and the second cooling air passage are in the longitudinal direction. Therefore, it can be configured to communicate with each other in a plurality of positions.

According to the present invention, the glass plate, which is built on the conveyor and transported, is heated to gradually increase in temperature while transporting the glass plate by mixing hot air and cold air, and the temperature is increased while transporting the glass plate by mixing hot air and cold air. Cooling can be lowered gradually. That is, hot air and cold air can be properly mixed and supplied to the glass plate so that an appropriate temperature gradient occurs along the longitudinal direction of the conveyor. Particularly, in order to shorten the length of the discharge conveyor, the cooling means includes a first cooling air passage so that a first cooling section in which the temperature falls gently and a second cooling section in which the temperature drops rapidly in the longitudinal direction of the discharge conveyor are formed. And the number of through holes communicating with the second cooling air passage is increased along the longitudinal direction.

In addition, a closed end of the first preheating air passage of the preheating means is arranged at the inlet side of the supply conveyor, and one end of the membrane of the second preheating air passage is arranged at the outlet side of the supply conveyor, and the first cooling air passage of the cooling means is If the blocked end is disposed at the outlet side of the discharge conveyor and the blocked end of the second cooling air passage is disposed at the inlet side of the discharge conveyor, the temperature gradient can be adjusted more easily around the rotary vacuum suction gripper.

According to the present invention, a method and apparatus for removing fine cracks generated by cutting edges using a flame are provided.

According to the present invention, the cracks formed at the cutting edges can be completely removed by local melting of the cutting edges, thereby making it possible to produce a cut glass plate having excellent quality. In addition, according to the present invention, it is possible to provide a high quality cut glass plate that does not cause secondary cracks due to mechanical impact during crack removal. In addition, according to the present invention, by synchronizing the operation of the rotary vacuum suction gripper and the supply conveyor and the discharge conveyor to provide a glass plate cutting edge crack removal device with excellent productivity. In addition, according to the present invention, it is possible to remove the crack of the glass plate cut edge without generating any fine glass particles at all can reduce the manufacturing cost by eliminating the washing and drying process.

1 is a schematic view showing an embodiment of a cutting edge crack removal apparatus of the glass plate according to the present invention

Figure 2 is a perspective view of the glass plate is cracked at the cutting edge

3 is a perspective view of one embodiment of a burner used in the apparatus shown in FIG.

4 is an enlarged cross-sectional view of a portion where the burner of FIG. 1 is installed;

5 is a cross-sectional schematic view taken along the line A-A of FIG.

FIG. 6 is an exploded perspective view of an essential part of an embodiment of supplying a vacuum to the vacuum suction arm of the rotary vacuum suction gripper through the rotary shaft and the rotary shaft housing in the apparatus shown in FIG. 1; FIG.

7 is a cross-sectional schematic view taken along the line B-B of FIG.

8 is a perspective view of one embodiment of the glass plate holder of the apparatus shown in FIG.

9 is a schematic illustration showing the operation of the rotary vacuum suction gripper of the apparatus shown in FIG.

10 is an explanatory view showing a state where the cutting edge crack of the glass plate is removed in the apparatus of FIG.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 is a schematic view showing an embodiment of a cutting edge crack removal device of a glass plate according to the present invention. The cutting edge crack removing apparatus 100 of this embodiment includes a burner 10 for melting the cutting edge of the glass plate 30, combustion gas supply means for supplying combustion gas to the burner 10 (not shown). And a rotary vacuum suction gripper 20 for holding the glass plate 30 to approach the burner 10. The burner 10 is installed in the upper portion of the center of the frame 41. The combustion gas supply means for supplying the combustion gas to the burner 10 is connected to the gas pipe although not shown. The combustion gas supply means uses a device for supplying combustion gas to a general burner, which is obvious to those skilled in the art. The supply conveyor 54 is provided in the frame 41 and continuously supplies the glass plate 30 to the rotary vacuum suction gripper 20. In addition, the discharge conveyor 64 is installed on the frame 41, and after the cutting edge crack is removed from the burner 20, the glass plate 30 provided from the rotary vacuum suction gripper 20 is received and discharged continuously. The discharge conveyor 64 is provided with a slightly lower height than the supply conveyor 54 or the upper surface so that the glass plate 30 from which the cutting edge cracks are removed is easily placed. In addition, the cutting edge crack removal apparatus 100 of the present embodiment includes preheating means for preheating the glass plate moving on the supply conveyor, and cooling means for cooling the glass plate 30 moving on the discharge conveyor (64).

2 shows a glass plate 30 for removing cutting edge cracks using the apparatus of this embodiment. The circular hole 33 and the long hole 34 are cut | disconnected and formed in the glass plate 30 of this embodiment cut | disconnected in the predetermined shape. The upper surface 31 of the glass plate 30 is defined by the upper outer cutting edge 31b, the upper cutting edge 31c of the circular hole 33, and the upper cutting edge 31d of the long hole 34. The lower surface 32 of the glass plate 30 is defined by the lower outer cutting edge 32b and the lower cutting edge 32c of the circular hole 33 and the lower cutting edge 32d of the long hole 34. In addition, the cut surface of the glass plate 30 connects the corresponding upper cutting edges and the lower cutting edges, respectively. For example, the outer cut surface 35 is a surface connecting the upper outer cutting edge 31b and the lower outer cutting edge 32b. As shown in the dashed circle of FIG. 2, minute cracks C are formed near each of the cutting edges starting from the cutting edges generated when cutting the pane.

3 shows a burner 10 in which a flame radiation hole for removing the cut edge crack C of the glass plate 30 shown in FIG. 2 is formed. The burner 10 includes a flame radiating plate 11, a combustion gas supply cylinder 12, and a burner support part 13. One end of the combustion gas supply pipe 14 is connected to the combustion gas supply cylinder 12, and the other end of the combustion gas supply pipe 14 is connected to the connector 15.

The flame radiating plate 11 has a flame radiating surface 11a. In the present embodiment, since the glass plate 30 is planar, the flame emitting surface 11a is also planar but is not limited thereto. If the cut glass plate has a curved shape, the flame-emitting surface is also formed in the corresponding curved shape. Flame radiating plate 11 is a flame radiating hole 111 is processed according to the cutting edge contour of the glass plate to be processed, if the shape of the glass plate to be changed is changed to a flame radiating hole corresponding to the changed shape is formed. Can be. As shown in the dotted circle in Fig. 3, the flame radiating surface 11a is formed with a plurality of flame radiating holes 111 having a constant diameter d at regular intervals l. The diameter (d) of the flame spinning hole is preferably in the range of 0.1-2 mm. The diameter d of the flame spinning hole is determined in consideration of the distance l between neighboring flame spinning holes 111. In addition, the diameter d of the hole is determined in consideration of the distance h between the flame-emitting surface 11a and the glass plate 30 and the thickness t of the glass plate. In this embodiment, the diameter of the hole is 0.6 mm, the spacing between the flame spinning holes 11 is 0.8-1.2 mm, and the thickness of the glass plate 30 is 0.7 mm. In addition, in order to remove the crack of a cutting edge with a flame, the space | interval h between the flame radiating surface 11a and the glass plate 30 was 11 mm (refer FIG. 7). Each flame radiating hole 111 communicates with the combustion gas supply cylinder 12. In addition, in the present embodiment, the flame radiation hole 111 is not limited to a circular shape, but may also have a slit shape having a predetermined width and length.

The virtual single closed curve connecting the centers of the adjacent flame emitting holes 111 has the same shape as the contour of the corresponding cutting edge of the glass plate 30, and the flame emitting holes 111 are orthogonal to the glass plate of the corresponding single closed curve. It is formed so that it may be located in the outer side of this glass plate. The contour of the upper outer cutting edge 31b of the upper surface 31 of the glass plate 30 corresponds to the virtual single closed curve S1, and cuts the upper outer portion therein to the orthographic projection of the single closed curve S1 with respect to the glass plate 30. The flame spinning hole 111 is formed to include the outline of the edge 31b. In addition, the contour of the upper cutting edge 31c of the circular hole 33 of the glass plate 30 corresponds to the virtual single closed curve S2, and the orthogonal projection of the single closed curve S2 with respect to the glass plate 30 is the circular hole ( It enters inside the contour of the upper cutting edge 31c of 33). In addition, the contour of the upper cutting edge 31d of the long hole 34 of the glass plate 30 corresponds to the virtual single closed curve S3, and the orthogonal projection of the single closed curve S3 to the glass plate 30 is the long hole 34. It enters inside the contour of the upper cutting edge 31d of.

4 is an enlarged cross-sectional view of a portion where the burner of FIG. 1 is installed. Referring to FIG. 4, cooling

water passages

12a, 12b, 12c, and 12d for cooling the burner 10 from overheating are formed in the combustion gas supply cylinder 12 of the burner 10. In addition, the combustion gas mixer 16 is connected to the connector 15 of the burner 10. The combustion gas mixer is mixed with LNG, LPG or acetylene gas and oxygen from an external gas source. Burner 10 is fixed to burner support frame 17, burner support frame 17 is not shown, it is provided to be able to move up and down by a hydraulic or pneumatic cylinder. This prevents the glass plate 30 from being damaged by collision with the burner 10 when the rotating shaft rotates while the glass plate 30 is sucked and gripped by the arm of the rotary vacuum suction gripper 20. In order to retract the burner 10 to the upper portion (see FIG. 7).

5 is a schematic cross-sectional view taken along the line A-A of FIG. The rotary vacuum suction gripper 20 includes a rotating shaft 21 installed on the frame 41. The rotating shaft 21 is rotatably supported by the rotating shaft housing 27 by the bearing 28, and is connected to the motor 29 by the coupling 29a. The rotating shaft housing 27 is provided in the frame 41. The hub 22 is fixed to the free end of the rotating shaft 21, and four

vacuum suction arms

22a, 22b, 22c, and 22d are fixed to the hub 22 at equal intervals (90 degree intervals) along the circumferential direction. It is. At the free end of each of the

vacuum suction arms

22a, 22b, 22c, and 22d, suction surfaces 23a, 23b, 23c, and 23d are respectively formed to suck and hold the glass plate 30 by vacuum. The rotating shaft 21 is disposed in parallel with the flame emitting surface 11 of the burner 10, and the suction surfaces 23a, 23b, 23c and 23d of the

vacuum suction arms

22a, 22b, 22c and 22d, respectively. Is disposed so as to face the flame radiation surface 11 of the burner 10 at a predetermined position during the rotation of the rotary shaft 21.

Referring to the enlarged cross-sectional view of the dotted ellipse of FIG. 5 and to FIG. 6, the suction surfaces 23a, 23b, 23c, respectively of the

vacuum suction arms

22a, 22b, 22c, 22d when the rotating shaft 21 rotates. In order to provide a vacuum to 23d), a vacuum supply surface 27a is formed on the rotation shaft housing 27. A part of the rotation shaft housing 27 is removed on the vacuum supply surface 27a to form a vacuum chamber 27b. The vacuum chamber 27b is connected to an external vacuum source through a passage 27d formed in the rotary shaft housing 27. A part of the rotary shaft housing 27 is removed from the vacuum supply surface 27a. The vacuum releasing chamber 27c is formed The vacuum releasing chamber 27c communicates with the outside air through the passage 27e formed in the rotary shaft housing 27. The vacuum releasing chamber 27c and the vacuum releasing chamber 27c are released. The chamber 27c is formed in constant width on the concentric circumference.

In addition, a flange 26 having a diameter increased is formed on the rotation shaft 21. The flange 26 has a vacuum accommodating surface 26a formed to be in close contact with the vacuum supply surface 27a of the rotating shaft housing 27. On the vacuum receiving surface 26a, four

vacuum passage inlets

25a, 25b, 25c, and 25d are formed at equal intervals at 90 degree intervals from the center to the vacuum chamber 27b and the vacuum release chamber 27c. have. In addition, the rotary shaft 21 extends into the rotary shaft 21 at the respective

vacuum passage inlets

25a, 25b, 25c, and 25d, so that the suction surfaces 23a of the respective

vacuum suction arms

22a, 22b, 22c, and 22d. And four vacuum passages 25-1, 25-2, 25-3, 25-4 formed in communication with 23b, 23c, 23d. When the vacuum passage inlet 25a faces the vacuum chamber 27b (in communication) when the rotary shaft 21 rotates, a vacuum is applied to the vacuum passage 25-1, and the vacuum passage 25-1 is formed. The vacuum is applied to the suction surface 23a of the vacuum suction arm 22a, so that the glass plate 30 can be sucked and held. When the rotary shaft 21 intermittently rotates and stops at intervals of 90 degrees, and the vacuum passage inlet 25a faces the vacuum release chamber 27b (in communication), the vacuum applied to the vacuum passage 25-1 is released. The vacuum is applied to the adsorption surface 23a of the vacuum adsorption arm 22a on which the vacuum passage 25-1 is formed to be released, so that the glass plate 30 adsorbed and held is separated from the adsorption surface 23a. In this embodiment, the vacuum receiving surface 26a of the flange 26 of the rotating shaft 21 formed to face the vacuum supply surface 27a of the rotating shaft housing 27 to be in close contact with each other in the form of a disk. It is not limited to this. For example, a vacuum passage inlet may be formed by using the outer peripheral surface of the cylindrical flange as a vacuum accommodating surface, and a vacuum chamber and a vacuum release chamber may be formed on the inner peripheral surface of the cylindrical housing.

Referring to FIG. 5, the burner 10 is installed on the upper portion of the frame 41 so that the flame radiation surface 11 faces downward. As shown in FIG. 4, the rotary shaft 21 of the rotary vacuum suction gripper 20 rotates 90 degrees by the glass plate 30 adsorbed on the suction surface 23a of the vacuum suction arm 22a, so that the cutting edge contour is burner. The gap h between the flame-emitting surface 11 and the glass plate 30 is maintained so as to be in direct contact with the flame f radiated from the flame-emitting hole 111 in (10). The burner 10 is disposed above the glass plate 30 so that the glass near the cutting edge melted by the flame f of the burner 20 rides on the cut surface 35 of the glass plate 30 by gravity. Will flow down. That is, the cutting edge of the glass plate 30 which is first melted in contact with the high temperature part of the flame f is placed on the upper portion, so that the molten glass flows down the cutting surface 35 even though the molten glass flows down. It is easy to prevent the occurrence of defects by adjusting the heating conditions so as not to flow down.

1 and 5, the end end of the supply conveyor 54, the start end of the discharge conveyor 64, the rotary shaft 21 of the rotary vacuum suction gripper 20, and the

vacuum suction arms

22a, 22b, 22c. , 22d is provided inside the chamber 71 surrounded by the heat insulating material 73 to maintain the temperature of the preheated glass plate 30. In addition, the air heated by the fan connected to the motor 72 is circulated in the chamber 71 to maintain the temperature inside the chamber uniformly (q section in the temperature graph of FIG. 1).

Referring to FIG. 1, the glass plate 30 supply conveyor 54 and the discharge conveyor 64 in this embodiment use a chain conveyor, but are not limited thereto. A drive sprocket 54a for driving the supply conveyor 54 is disposed on the rotary vacuum suction gripper 20 side, and a driven sprocket 54b is disposed on the opposite side. Although not shown, the drive conveyor drive motor is connected to the drive sprocket 54a. In addition, a drive sprocket 64a for driving the discharge conveyor 64 is disposed on the rotary vacuum suction gripper 20 side, and a driven sprocket 64b is disposed on the opposite side. Although not shown, the drive conveyor drive motor is connected to the drive sprocket 64a.

Before the glass plate 30 is supplied to the rotary vacuum adsorption gripper 20 using the supply conveyor 54 to melt and remove the cracks by flame, the glass plate 30 is prevented from being damaged by the thermal stress caused by a sudden temperature change. In order to do so, it is necessary to preheat the glass plate. The preheating temperature of the glass plate 30 can be in the range of 500 degreeC-630 degreeC which is the temperature range of the annealing vicinity of glass, and it is preferable to preheat in about 600 degreeC range. The glass plate preheating means 50 of this embodiment is installed in the upper portion of the supply conveyor 54 extending in the longitudinal direction and closed at one end of the first preheating air passage 51 and the upper portion of the first preheating air passage 51. It includes a second preheating air passage 52 extending in the longitudinal direction and closed at one end. In the present embodiment, the second preheated air passage 52 is located above the first preheated air passage 51, but may be provided at a position adjacent to the upper portion. At the other end which is not closed of the 1st preheating air passage 51, the 1st heater which heats the air for preheating the glass plate 30 is provided. At the rear of the first heater, a first blower for supplying air to the first heater is provided. Since the installation of the first heater and the first blower are obvious technical matters to those skilled in the art, the illustration of FIG. 1 is omitted. In addition, the second non-closed end of the second preheating air passage 53 is provided with a second blower for supplying air that is not heated. In addition, referring to the enlarged view of the inside of circle C of FIG. 1 and FIG. 7, a plurality of through holes 51a are formed in the lower surface of the first preheating air passage 51 toward the supply conveyor in the longitudinal direction, so that the first The preheating air passage 51 and the space 55 in which the supply conveyor 54 is installed communicate with each other. In addition, a plurality of through-holes 52a are formed in the upper surface of the first preheating air passage 51 and the lower surface of the second preheating air passage 52 along the length direction, so that the first preheating air passage 51 is formed. And the second preheating air passage 52 communicate with each other. Therefore, by adjusting the amount of cold air supplied to the through-hole 52a of the second preheating air passage 52 to the heated air supplied to the first preheating air passage 51, the longitudinal direction of the supply conveyor 54 is adjusted. Accordingly, the temperature of the air discharged through the through hole 51a can be adjusted. That is, hot air and cold air may be properly mixed and supplied to the glass plate so that an appropriate temperature gradient occurs along the longitudinal direction of the conveyor (the temperature gradient of a constant slope as shown in p section of the graph along the longitudinal direction of FIG. 1). To adjust the number and size of through holes. Therefore, the temperature of the glass plate 30 conveyed by the supply conveyor 54 can be gradually raised. The supply conveyor 54, the first preheating air passage 51, and the second preheating air passage 52 are surrounded by a heat insulating material 53 along the longitudinal direction.

Residual strain is present at the cutting edges that are adsorbed by the rotary vacuum suction gripper 20 and the cracks are removed by the flame f radiated from the burner 20. In order to remove this, annealing (annealing) operation of slowly cooling the glass plate 30 is required. The cooling rate is preferably maintained at a rate of 14-18 ° C./min up to 350 ° C. and at a rate of 56 ° C.-62 ° C./min from 350 ° C. to room temperature. The glass plate cooling means 60 for gradually cooling the glass plate 30 from which the crack has been removed is installed in the upper part of the discharge conveyor 64 extending in the longitudinal direction and closed at one end thereof with the first cooling air passage 61. The second cooling air passage 62 extends along the longitudinal direction and is closed at one end of the first cooling air passage 61. In the present embodiment, the second cooling air passage 62 is located above the first cooling air passage 61, but may be provided in a neighboring position instead of the upper portion. At the other end which is not closed of the 1st cooling air passage 61, the 2nd heater for heating air is provided. At the rear of the second heater, a third blower for supplying air to the second heater is provided. Since the installation of the second heater and the third blower are obvious technical matters to those skilled in the art, the illustration of FIG. 1 is omitted. In addition, at the other end of the second cooling air passage 63, which is not closed, a fourth blower is provided to supply external air that is not heated. In addition, referring to the enlarged view of the original D in FIG. 1, a plurality of through-holes 61a are formed in the lower surface of the first cooling air passage 61 toward the supply conveyor in the longitudinal direction to form the first cooling air passage 61. ) And the space 65 in which the discharge conveyor 54 is installed communicate with each other. In addition, a plurality of through holes 62a are formed in the upper surface of the first cooling air passage 61 and the lower surface of the second cooling air passage 62 along the longitudinal direction, so that the first cooling air passage 61 is formed. And the second cooling air passage 62 communicate with each other. Accordingly, the longitudinal direction of the discharge conveyor 64 is adjusted by adjusting the amount of air supplied to the through-hole 62a of the second cooling air passage 62 to the heated air supplied to the first cooling air passage 51. Therefore, it is possible to adjust the temperature of the air discharged through the through-hole 61a (as shown in the graph of Figure 1, the number and size of the through-holes so as to gradually cool at first to have a gentle temperature gradient, such as the r section of the graph) After cooling to below a certain temperature, in order to shorten the length of the conveyor, adjust the number and size of the through-holes to have a sharp temperature gradient as in the s section). Therefore, it is possible to gradually cool the temperature of the glass plate 30 transferred by the discharge conveyor (64). That is, hot air and cold air can be properly mixed and supplied to the glass plate so that an appropriate temperature gradient occurs along the longitudinal direction of the conveyor. The discharge conveyor 64, the first cooling air passage 61 and the second cooling air passage 62 are surrounded by the heat insulating material 63 along the longitudinal direction.

The motor 56 installed in the lower portion of the supply conveyor 54 sucks air in the space 55 inside the supply conveyor 54 to circulate the heated air to the unclosed end of the first preheating air passage 51. It is for driving a fan. In addition, the motor 66 installed in the lower portion of the discharge conveyor 64 sucks air in the space 65 inside the discharge conveyor 64 to supply heated air to an unclosed end of the first cooling air passage 61. It is for driving a fan to circulate.

In addition, shortening the length of the conveyor, increasing the area of the glass plate in contact with the air, reducing preheating and cooling time, and feeding and discharging the glass plate on the conveyor so as to easily adsorb the glass plate with the rotary vacuum suction gripper. desirable. Referring to Figure 8, the supply conveyor 54 is composed of a pair of chains (54c, 54c ') provided at regular intervals to support both ends of the glass plate 30, each of the chains (54c, 54c') In the lower part, a pair of

support channels

54d and 54d 'are provided. Each of the

chains

54c and 54c 'has a pair of holders

54k having slits

54h and 54h' through which the glass plate 30 is inserted and a supporting surface 54g for supporting the side surfaces of the glass plate 30. 54k 'are fixed to the opposite inner sides of the

chains

54c and 54c', respectively. A plurality of holders are continuously installed along the loop chain. On the opposite side of each of the

chains

54c and 54c ', a pair of guide plates 54e for guiding the glass plate 30 to be inserted into the

slits

54h and 54h' and preventing it from falling out of the

slits

54h and 54h ' 54e ') is fixed. Above the

guide plates

54e and 54e ',

bent portions

54f and 54f' bent outward are formed so that the glass plate 30 is easily inserted, respectively. When the holder 81 is installed to transport the glass plate 30 upright, the length of the conveyor can be shortened, and the area of the glass plate in contact with air can be widened to reduce preheating and cooling time. In addition, the glass plate 30 can be easily adsorbed by the rotary vacuum suction gripper 20, and the adsorbed glass plate can be easily set down. In addition, by synchronizing the operation of the rotary vacuum suction gripper 20 and the supply conveyor 54 and the discharge conveyor 64, by rotating the rotary gripper 20 intermittently at regular time intervals, the first arm absorbs the glass plate and grips it. At the same time, the second arm heats the glass plate at the burner, and at the same time the third arm can lower the glass plate from which the cutting edge cracks have been removed onto the discharge conveyor to increase productivity. Although only the holder of the supply conveyor 54 is shown in FIG. 8, the discharge conveyor 64 which is not shown in detail also has a pair of chain, and the holder of the same structure is provided in each chain.

On the other hand, if the glass plate inserted into the holder's slit is sucked by the vacuum suction arm of the rotary vacuum suction gripper and immediately rotated while being inserted into the holder, the glass plate may be caught by the slit or broken by the glass plate inserted into the adjacent slit. have. In order to prevent interference of the glass plate, a rotary vacuum suction gripper 20 and a burner 10 are configured as shown in FIG. 9. First, when the center of the rotary vacuum suction gripper 20 is located at C1, the glass plate 30 supplied to the supply conveyor 54 is sucked and gripped by the suction arm of the rotary vacuum suction gripper 20. Next, the rotary vacuum suction gripper 20 is vertically raised so that the center thereof is positioned at the C2 position, and the glass plate 30 is removed from the slit of the holder. Next, the rotary vacuum suction gripper 20 is rotated to bring the adsorbed glass plate 30 to the flame-radiating surface of the burner 10. In order to prevent the burner 10 and the glass plate 30 from colliding when the adsorbed glass plate 30 is close to the burner 10, the burner frame 17 is vertically raised by a predetermined distance to raise the burner 10 and the glass plate. Do not collide. Next, the burner frame 17 is lowered by a predetermined distance so that the flame of the burner 10 heats the cutting edge of the glass plate 30 for a predetermined time. Next, the rotary vacuum suction gripper 20 is vertically lowered so that the center of the rotary vacuum suction gripper 20 is located at C1. When the vacuum suction gripper 20 is lowered, the glass plate is adsorbed to the suction arm on the supply conveyor 54 side, and the vacuum is released to the suction arm on the discharge conveyor 64 side, and the glass plate is separated from the arm. ) In order to increase productivity, when the rotary vacuum suction gripper 20 rises to an appropriate position, the rotary vacuum adsorption gripper 20 may be rotated at the same time as the ascension, and even when descending, the rotary vacuum adsorption gripper 20 may be rotated to the proper position.

1 and 10 will be described in detail the process of removing the crack of the cutting edge of the glass plate 30. When the vacuum suction arm 22a sucks the glass plate 30 supplied by the conveyor 54 at the first position, and the rotary shaft 21 rotates 90 degrees, the vacuum suction arm 22a is the upper surface of the glass plate 30. The glass plate 30 is transferred to the second position so that the 31 faces the flame emitting surface 11 of the burner 10 (FIG. 10A). As shown in FIG. 3, the flame radiating surface 11a blocks a portion other than the cutting edge so that the flame does not contact, and a plurality of flame radiating holes 111 are formed so that the flame directly contacts the cutting edge and the cutting surface. have. The upper outer cutting edge 31b of the glass plate 30 in contact with the high temperature portion f1 of the flame f and the upper glass of the cutting surface 35 are first melted to remove cracks (FIG. 10B). When a certain time elapses while the rotation of the rotating shaft 21 is stopped, the lower outer cutting edge 32b of the glass plate 30 in contact with the low temperature portion f2 of the flame f and the lower glass of the cutting surface 35 Melt and cracks are removed. First, the molten upper side glass flows down the cut surface 35, so that the rotating shaft 21 is rotated 90 degrees before flowing down to the lower surface 32 of the glass plate 30 or less (in the state of FIG. 10C). ) To the third position to finish heating. When the third position is reached, the vacuum of the vacuum suction arm 22a is released and the glass plate 30 is separated onto the discharge conveyor 64. 10D is a partial perspective view of the glass plate 30 from which the cutting edge cracks have been removed. When the crack of the cutting edge is removed using the apparatus of the present invention, as shown in FIG. 5D, the cutting edge 36 of the glass plate 30 has a convex curved shape. In addition, the glass plate 30 has a shape in which the upper outer cutting edge, the lower outer cutting edge, and the side cutting edge are all convex and curved. The cracks are removed, and the cutting edges are convex, and the glass plate 30 having the cutting edges of the convex curved edges connected with all the cutting edges distributes the concentrated stress so that the strength is excellent.

An embodiment of the present invention described above and illustrated in the drawings should not be construed as limiting the technical spirit of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention, as will be apparent to those skilled in the art.

Claims

A burner including a flame radiation surface and a plurality of flame radiation holes formed on the flame radiation surface and arranged such that an imaginary line connecting neighboring flame radiation holes is at least one single closed curve;

Combustion gas supply means for supplying combustion gas to the burner;

A rotary shaft disposed in parallel with the flame emitting surface of the burner, and a vacuum suction arm having one end fixed to the rotary shaft and having an adsorption surface formed at the other end, wherein the vacuum suction arm is sucked and held at a predetermined position when the rotary shaft rotates. Cut edge crack removal device of the glass plate comprising a rotary vacuum suction gripper installed so that one side of the burner toward the flame radiation surface of the burner.
The method of claim 1,

The rotary vacuum suction gripper is provided with a plurality of vacuum suction arms, each vacuum suction arm is subjected to a vacuum on the suction surface in the vacuum suction section with respect to one rotation of the rotary shaft, the vacuum applied to the suction surface in the vacuum release section is released Cracking device for cutting edges of glass plates.
The method of claim 2,

The first position and the second position belong to the vacuum suction section, and the third position and the fourth position belong to the vacuum release section with respect to one rotation of the rotary shaft.

Each vacuum suction arm is vacuumed on the adsorption surface at the first position to adsorb and grip the glass plate, and cut the glass plate close to the flame radiation surface so that the cut edge of the glass plate is in direct contact with the flame radiated from the burner at the second position. The cutting edge crack removal apparatus of the glass plate which removes the edge crack and releases the glass plate hold | maintained by the vacuum which caught on the adsorption surface in 3rd position.
The method of claim 3,

A plurality of vacuum passage inlets corresponding to the respective vacuum suction arms are formed on the outer circumferential surface of the rotating shaft, and the plurality of vacuum passages extend from the respective vacuum passage inlets to the inside of the rotary shaft to communicate with the suction surfaces of the respective vacuum suction arms. A passage is formed,

And a rotating shaft housing for supporting the rotating shaft, wherein a vacuum chamber connected to a vacuum source and a vacuum releasing chamber in communication with the atmosphere are formed on an opposite surface of the rotating shaft housing facing the respective vacuum passage inlets of the rotating shaft.

The outer circumferential surface of the rotary shaft around each of the vacuum passage inlets is in close contact with the rotating shaft housing to rotate. When the respective vacuum suction arms are positioned in the vacuum suction section during the rotation of the rotary shaft, the corresponding vacuum passage inlet communicates with the vacuum chamber. And, if the vacuum suction arm is located in the vacuum release section, the vacuum passage inlet is cut edge crack removal device of the glass plate to be in communication with the vacuum release chamber.
The method according to any one of claims 1 to 4,

A supply conveyor for continuously supplying glass plates to the rotary vacuum suction gripper;

A discharge conveyor for continuously discharging the glass plates provided from the rotary vacuum suction gripper;

Preheating means for preheating the glass plate moving on the supply conveyor;

Cutting edge crack removal apparatus of the glass plate, characterized in that it comprises cooling means for cooling the glass plates moving on the discharge conveyor.
The method of claim 5,

The cutting edge crack removal device of the glass plate further comprises a plurality of glass plate holder formed with a slit for inserting the glass plate is erected on the supply conveyor and the discharge conveyor.
The method of claim 6,

The rotary vacuum adsorption gripper sucks and grips the glass plate supplied from the supply conveyor, extracts it from the slit of the glass plate holder, and inserts the glass plate from which the cutting edge crack is removed into the slit of the glass plate holder in the discharge conveyor. Cutting edge crack removal device on glass plates to allow distance movement.
The method of claim 5,

The preheating means,

A first preheating air passage extending in a longitudinal direction and installed at an upper end of the supply conveyor, and a second end extending in a longitudinal direction at a position adjacent to the first preheating air passage and closed in one end; A preheated air passage, a first heater connected to the other end of the first preheated air passage, a first blower for supplying air to the first heater, and a second heater connected to the other end of the second preheated air passage A second blower for supplying,

A plurality of through holes are formed in the lower surface of the first preheating air passage facing the supply conveyor in the longitudinal direction, and the first preheating air passage and the second preheating air passage communicate with each other at a plurality of positions along the longitudinal direction. There is,

The cooling means

A first cooling air passage extending in a longitudinal direction and installed at an upper end of the discharge conveyor, and a second end extending and extending in a longitudinal direction at a position adjacent to the first cooling air passage; A second air connected to the cooling air passage, the other end of the first cooling air passage, a third blower for supplying air to the second heater, and the other end of the second cooling air passage to connect external air. A fourth blower for supplying,

The lower surface of the first cooling air passage facing the discharge conveyor is formed with a plurality of through holes in the longitudinal direction, and the first cooling air passage and the second cooling air passage communicate with each other at a plurality of positions along the longitudinal direction. Cutting edge crack removal device of glass plate.
The method of claim 8,

The closed end of the first preheating air passage of the preheating means is arranged at the inlet side of the supply conveyor, and the one end of the membrane of the second preheating air passage is arranged at the outlet side of the supply conveyor,

The closed edge crack removal apparatus of the glass plate of the said cooling means the one end of the 1st cooling air path which is arrange | positioned at the exit side of a discharge conveyor, and the one closed end of the 2nd cooling air path is arrange | positioned at the entrance side of a discharge conveyor.
The method according to claim 8 or 9,

The cooling means passes through the first cooling air passage and the second cooling air passage so as to form a first cooling section in which the temperature gradually decreases and a second cooling section in which the temperature drops rapidly along the longitudinal direction of the discharge conveyor. Cut edge crack removal apparatus of the glass plate formed so that the number of holes may increase along a longitudinal direction.
The method of claim 8,

The glass plate preheating means is cut edge crack removal device of the glass plate, characterized in that for preheating the glass plate to a temperature in the range of 500 ℃-630 ℃.
The method of claim 1,

The rotary vacuum suction gripper is a glass plate, characterized in that to maintain the gap between the flame radiation surface and the glass plate so that the cutting edge contour of the glass plate vacuum-absorbed on the vacuum suction arm is in direct contact with the flame radiated from the flame radiation hole of the burner. Cutting edge crack removal device.
The method of claim 12,

The plurality of flame radiating holes of the burner is circular, the cutting edge crack removal device of the glass plate, characterized in that in the range of 0.1-2 mm.
The method of claim 12,

The plurality of flame-emitting holes are cut edge crack removal device of the glass plate, characterized in that the slit shape having a predetermined width.
The method of claim 1,

Combustion gas supplied to the combustion gas supply means is a cutting edge crack removal device of the glass plate, characterized in that the combustion gas containing LNG, LPG, or acetylene gas and oxygen.