JP5614403B2 - Raw material supply method and raw material supply apparatus, and glass plate manufacturing apparatus and manufacturing method - Google Patents

Description

  The present invention relates to a raw material supply method and a raw material supply apparatus for supplying a glass raw material to a melting tank of a glass melting furnace, and a glass plate manufacturing apparatus and manufacturing method.

  As a raw material supply method for supplying a glass raw material to a melting tank of a glass melting furnace, a method using a screw feeder, a vibration feeder, a blanket feeder, an oscillation feeder, or a combination thereof is generally known.

  Among these, a combination of a blanket feeder and an oscillation feeder, as shown in FIG. 1, drops the powdery or granular glass raw material 1 from the hopper 2 onto the transport pan (feeder) 3 and then transports the pan. 3 is moved back and forth, and the glass raw material 1 on the transport surface 4 of the transport pan 3 is put into the melting tank 6 of the glass melting furnace 5 (see, for example, Non-Patent Document 1).

  Specifically, the conveyance surface 4 of the conveyance pan 3 is an inclined surface that falls forward toward the inside of the glass melting furnace 5. When the transport pan 3 moves in a direction approaching the glass melting furnace 5, the glass raw material 1 is sent out (dropped) from the hopper 2 onto the transport surface 4. When the transport pan 3 moves in a direction away from the glass melting furnace 5, the glass raw material 1 on the transport surface 4 is charged into the melting tank 6.

“Glass Engineering Handbook” by Masayuki Yamane et al., Asakura Shoten Publishing, July 5, 1999, p. 301-302, FIG. 1.8 (b)

  However, since the conveying surface 4 is an inclined surface that falls forward toward the inside of the glass melting furnace 5, even if the glass raw material 1 slides down due to the inclination from the conveying surface 4, it is introduced into the melting tank 6. A front end 3 a of the transport pan 3 is disposed in the vicinity of the raw material inlet 7. Therefore, the conveyance pan 3 is heated by the radiant heat from the glass melting furnace 5, and the glass raw material 1 on the conveyance surface 4 becomes high temperature. For this reason, when the glass raw material 1 changes in quality and the fluidity | liquidity of the glass raw material 1 deteriorates (decreases), it may become difficult to introduce | transduce the glass raw material 1 into the fusion | melting tank 6 by a fixed amount each time.

  The present invention has been made in view of the above problems, and is a raw material supply method and a raw material supply apparatus capable of stably feeding a glass raw material on a conveyance surface into a glass melting furnace in a certain amount each time. An object is to provide a manufacturing apparatus and a manufacturing method.

According to one aspect of the invention,
In a raw material supply method of dropping a glass raw material from a hopper onto a transport pan, reciprocating the transport pan in an inclined direction, and charging the glass raw material on the transport surface inclined of the transport pan into a melting tank of a glass melting furnace ,
When the transport pan advances from the transport direction upstream end to the transport direction downstream end, a cutter that can be inserted into the glass raw material on the transport surface moves to a standby position above the glass raw material on the transport surface,
When the transport pan retracts from the downstream end in the transport direction to the upstream end in the transport direction, the cutter moves to the glass raw material insertion position on the transport surface and stops at the insertion position along with the backward movement of the transport pan. There is provided a raw material supply method in which a cutter relatively pushes at least a part of a glass raw material downstream of the cutter in the transport direction from the transport pan and puts it into the melting tank .

According to another aspect of the invention,
In the raw material supply method of dropping the glass raw material from the hopper onto the transport pan, reciprocating the transport pan and charging the glass raw material on the transport surface of the transport pan into the melting tank of the glass melting furnace,
When the transport pan advances from the transport direction upstream end to the transport direction downstream end, a cutter that can be inserted into the glass raw material on the transport surface moves to a standby position above the glass raw material on the transport surface,
When the transport pan retracts from the downstream end in the transport direction to the upstream end in the transport direction, the cutter moves to the glass raw material insertion position on the transport surface and stops at the insertion position along with the backward movement of the transport pan. The cutter extrudes at least a portion of the glass raw material downstream of the cutter in the transport direction relative to the transport pan, and puts it in the melting tank.
When the transport pan advances from the upstream end in the transport direction to the downstream end in the transport direction, the raw material supply for moving the glass raw material floating on the molten glass in the melting tank to the downstream side of the melting tank at the front end of the transport pan A method is provided.

According to yet another aspect of the invention,
It has a transport pan that transports the glass raw material dropped from the hopper, and the transport pan is reciprocated in the tilt direction, and the glass raw material on the transport surface inclined of the transport pan is put into the melting tank of the glass melting furnace. In the raw material supply device
A cutter that can be inserted into the glass raw material on the transport surface,
When the transport pan advances from the transport direction upstream end to the transport direction downstream end, the cutter moves to a standby position above the glass raw material on the transport surface,
When the transport pan retracts from the downstream end in the transport direction to the upstream end in the transport direction, the cutter moves to the glass raw material insertion position on the transport surface and stops at the insertion position along with the backward movement of the transport pan. A raw material supply device is provided in which a cutter relatively pushes at least a part of the glass raw material downstream of the cutter in the conveying direction from the conveying pan and puts it into the melting tank.

According to yet another aspect of the invention,
In a raw material supply apparatus having a transport pan for transporting a glass raw material dropped from a hopper, reciprocating the transport pan, and charging the glass raw material on the transport surface of the transport pan into a melting tank of a glass melting furnace,
A cutter that can be inserted into the glass raw material on the transport surface,
When the transport pan advances from the transport direction upstream end to the transport direction downstream end, the cutter moves to a standby position above the glass raw material on the transport surface,
When the transport pan retracts from the downstream end in the transport direction to the upstream end in the transport direction, the cutter moves to the glass raw material insertion position on the transport surface and stops at the insertion position along with the backward movement of the transport pan. The cutter extrudes at least a portion of the glass raw material downstream of the cutter in the transport direction relative to the transport pan, and puts it in the melting tank.
When the transport pan advances from the upstream end in the transport direction to the downstream end in the transport direction, the raw material supply for moving the glass raw material floating on the molten glass in the melting tank to the downstream side of the melting tank at the front end of the transport pan An apparatus is provided.

  According to the present invention, it is possible to provide a raw material supply method and a raw material supply device, and a glass plate manufacturing apparatus and manufacturing method capable of stably feeding a glass raw material on a conveying surface into a glass melting furnace in a fixed amount. it can.

FIG. 1 is a schematic view showing a conventional example of a raw material supply apparatus. FIG. 2 is a block diagram showing a configuration of a glass plate manufacturing apparatus according to an embodiment of the present invention. FIG. 3 is a cross-sectional view for explaining the configuration and operation of the raw material supply apparatus 10 and shows a state in which the transport pan 22 is located at the upstream end in the transport direction and the cutter 24 is in the insertion position. FIG. 4 is a cross-sectional view for explaining the operation of the cutter 24, and is a cross-sectional view along the line AA ′ in FIG. 3. FIG. 5 is a cross-sectional view for explaining the configuration and operation of the raw material supply apparatus 10 and shows a state where the transport pan 22 is located at the upstream end in the transport direction and the cutter 24 is in the standby position. FIG. 6 is a cross-sectional view for explaining the operation of the cutter 24 and is a cross-sectional view taken along the line BB ′ of FIG. FIG. 7 is a cross-sectional view for explaining the configuration and operation of the raw material supply apparatus 10 and shows a state in which the transport pan 22 is located at the downstream end in the transport direction and the cutter 24 is in the standby position. FIG. 8 is a cross-sectional view for explaining the configuration and operation of the raw material supply apparatus 10 and shows a state in which the transport pan 22 is located at the downstream end in the transport direction and the cutter 24 is in the insertion position.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 2 is a block diagram illustrating a configuration of a glass plate manufacturing apparatus according to an embodiment of the present invention, and arrows indicate the flow of glass raw materials and molten glass. FIG. 3 is a cross-sectional view for explaining the configuration and operation of the raw material supply apparatus 10.

  As shown in FIGS. 2 and 3, the glass plate manufacturing apparatus includes a raw material supply device 10 for feeding a powdery or granular glass raw material G into the glass melting furnace 11, and a glass raw material G supplied by the raw material supply device 10. It has a glass melting furnace 11 for melting, and a molding furnace 12 for molding the molten glass L melted in the glass melting furnace 11 into a sheet glass.

  The glass melting furnace 11 may have a known configuration, for example, a raw material charging port 13, a melting tank 14, a clarification tank 15, and the like. A dustproof plate 16 for preventing the glass raw material G from scattering when the raw material is supplied is provided above the raw material inlet 13. The glass raw material G input from the raw material input port 13 moves to the downstream side (clarification tank 15 side) of the melting tank 14 while floating on the molten glass L in the melting tank 14.

  In the process of moving to the clarification tank 15 side, the glass raw material G is heated by flame heat or radiant heat in the glass melting furnace 11 or conduction heat from the molten glass L and gradually melts into the molten glass L. In order to melt the glass raw material G effectively, it is necessary to add the glass raw material G to the melting tank 14 widely, thinly, and in a fixed amount stably. In addition, supply of the glass raw material G using the raw material supply apparatus 10 is mentioned later.

  Since the molten glass L is obtained by melting the powdery or granular glass raw material G, it contains a large number of bubbles inside. Therefore, the molten glass L is sent from the melting tank 14 to the clarification tank 15, and bubbles are lifted and removed to perform clarification. Further, a vacuum degassing tank may be provided between the clarification tank 15 and the molding furnace 12.

  The molding furnace 12 may have a well-known configuration. For example, in the so-called float method, the molding furnace 12 includes a float tank 17 and the like. The clarified molten glass L flows out onto the molten metal (for example, molten tin) in the float bath 17 and becomes plate-like glass due to the smooth surface of the molten metal. The plate-like glass is cooled while moving to the downstream side of the float tank 17 to produce a glass plate.

  In the present embodiment, the molding furnace 12 is composed of the float tank 17 and the like, but the present invention is not limited to this. For example, in the so-called fusion method, the molding furnace 12 is composed of a molded body having a wedge-shaped cross section that converges downward. In this case, the clarified molten glass L flows down along both side surfaces of the molded body and joins at the lower edge of the molded body to form a sheet glass. The plate glass is cooled while being pulled downward, and a glass plate is manufactured.

  A plurality of (for example, two) raw material supply apparatuses 10 are installed side by side in the glass melting furnace 11 (melting tank 14) (only one is shown in FIG. 3). Each raw material supply device 10 includes a hopper 21 adjacent to the glass melting furnace 11, a transport pan 22 for transporting the glass raw material G dropped from the hopper 21 to the glass melting furnace 11, and a transport surface 23 of the transport pan 22. A cutter 24 that can be inserted into the glass raw material G is provided.

  First, the hopper 21 will be described.

  The hopper 21 is formed of a steel material (for example, SS material) or the like. The hopper 21 has a cylindrical shape that tapers downward, and has an inlet 21a on the upper side and an outlet 21b on the lower side. The hopper 21 is divided into a plurality of members in the vertical direction, and can be expanded and contracted in the vertical direction. Thereby, the position of the conveyance pan 22 can be adjusted in the vertical direction.

  Above the hopper inlet 21a, a mixer (not shown) is installed that weighs and mixes multiple types of raw materials to make glass raw materials G. The glass raw material G mixed by the mixer is dropped into the hopper inlet 21a and stored in the hopper.

  Various raw materials before mixing are pneumatically fed to a mixer through a raw material supply pipe (not shown). The inner circumference of the raw material supply pipe is covered with an electroformed brick having excellent wear resistance.

  The hopper outlet 21 b has a gap 25 between the hopper outlet 21 b and the conveying surface 23 of the conveying pan 22. From this gap 25, the glass material G in the hopper 21 is sent out (dropped) to the transport surface 23.

  The size of the gap 25, the inclination angle θ of the conveyance surface 23 with respect to the horizontal plane, and the angle of repose of the glass material G are set so that the glass material G is appropriately sent to the conveyance surface 23. The inclination angle θ (see FIG. 3) of the transport surface 23 with respect to the horizontal plane is preferably 8 ° to 15 °, and more preferably 10 ° to 12 °. The angle of repose of the glass raw material G is preferably 30 ° to 45 °, and more preferably 35 ° to 40 °.

  Here, the angle of repose was measured by a method as described in JIS R 9301-2-2 “Alumina powder—Part 2: Physical property measurement method-2: Angle of repose”. More specifically, the angle of repose is determined by passing a specimen (glass raw material G before being stored in the hopper 21) through a sieve having a diameter of 80 mm and a mesh size of 710 μm while vibrating it to a height of 160 mm on a horizontal plane. When it is gently dropped from a funnel onto a table with a diameter of 80 mm, it is defined by measuring the angle formed by the generatrix of the cone formed by the test body and the horizontal plane. Here, the amount of powder falling is assumed to drop until the angle of repose is substantially stabilized.

  Next, the conveyance pan 22 will be described.

  The conveyance pan 22 is formed of a steel material (for example, SS material) or the like. The transport pan 22 has a flat body 31. The upper surface of the main body 31 serves as a conveyance surface 23 on which the glass raw material G dropped from the hopper 21 is placed. A pair of side plates 32 project from the transport surface 23 so that the glass material G on the transport surface 23 does not slide down in a direction perpendicular to the transport direction.

  Since the conveyance surface 22 of the conveyance pan 22 is an inclined surface, the front end portion 22a is introduced from the material introduction port 13 so that the glass raw material G is introduced into the melting tank 14 even if the glass material G slides down due to the inclination. It is always inserted into the glass melting furnace 11. For this reason, the conveyance pan 22 is heated by the radiant heat from the glass melting furnace 11.

  Therefore, the raw material supply apparatus 10 includes a cooling unit that cools the transport pan 22. As the cooling means, for example, there is a refrigerant path 33 provided inside the transport pan 22. By causing the refrigerant to flow through the refrigerant path 33, the conveyance pan 22 can be cooled, and the temperature rise of the glass raw material G on the conveyance surface 23 can be suppressed.

Generally, a boron compound is mixed and used for the glass raw material G of the glass substrate for display. As the boron compound, boric acid (H ₃ BO ₃ ) is usually used. This boric acid is a hydrate and releases water of hydration when heated. Instead of boric acid, although it is possible to use anhydrous boric acid obtained by heating boric acid (B 2 _{O 3),} the production cost is high.

  Thus, when the glass raw material G contains a hydrate, when the conveyance pan 22 is heated by the radiant heat from the glass melting furnace 11, the glass raw material G on the conveyance surface 23 is heated and releases hydrated water. Sometimes. Then, the fluidity of the glass raw material G on the conveying surface 23 deteriorates (decreases), so there is a possibility that the glass raw material G is put into the melting tank 14 as a lump, and the glass raw material G is stably and constant in the melting tank 14. It is difficult to throw in quantities.

  Since the glass raw material G thrown into the melting tank 14 is heated and melted from the outside by flame heat, radiant heat, and heat transfer from the molten glass L in the glass melting furnace 11, when thrown as a lump, Large bubbles are trapped. Air bubbles can be defects in the glass plate being manufactured. Moreover, since the glass raw material G consists of several types of raw materials from which melting | fusing point differs, when it adds as a lump, time may be required until the whole fuse | melts and there exists a possibility that the composition of the molten glass L may become non-uniform | heterogenous.

  In the present embodiment, as described above, the inside of the transport pan 22 is cooled to suppress the temperature rise of the glass raw material G on the transport surface 23, so that the alteration of the glass raw material G (release of hydrated water from the glass raw material G) ) Can be suppressed. Thereby, the deterioration (decrease) of the fluidity of the glass raw material G on the conveyance surface 23 can be suppressed, and the glass raw material G can be stably fed into the melting tank 14 by a certain amount.

  The transport pan 22 is configured to be capable of reciprocating between an upstream end (retreat position) in the transport direction and a downstream end (forward position) in the transport direction. The transport pan 22 has a plurality of wheels 34 that can travel on a pair of guide rails 26. The guide rail 26 is supported by the frame 27, and guides the transport pan 22 toward the front of the glass melting furnace 11. For this reason, the conveyance surface 23 of the conveyance pan 22 is an inclined surface that falls forward toward the inside of the glass melting furnace 11.

  As shown in FIG. 7, for example, as shown in FIG. 7, each raw material supply device 10 has a motor 41 fixed to the frame 27, a rotary disk 42 attached to the rotary shaft of the motor 41, A rod 43 is provided. One end of the rod 43 is rotatably connected to the eccentric position of the rotating disk 42. The other end of the rod 43 is rotatably connected to the transport pan 22.

  The motor 41 is connected to a control device 28 such as a computer. When the rotating disk 42 is rotated by the rotation operation of the motor 41 under the control of the control device 28, one end of the rod 43 rotates around the rotation center of the rotating disk 42. Accordingly, the other end of the rod 43 swings, and the transport pan 22 connected to the other end of the rod 43 reciprocates on the guide rail 26.

  Here, the stroke amount of the transport pan 22 (the movement distance between the upstream end in the transport direction and the downstream end in the transport direction) is appropriately set according to the shape of the raw material inlet 13 and the like, but is 80 mm to 150 mm. Is preferable, and it is more preferable that it is 100 mm-120 mm.

  Each raw material supply apparatus 10 includes, as an adjustment mechanism for adjusting the relative position between the guide rail 26 and the melting tank 14, for example, as shown in FIG. 3, a movable carriage 51 and a lifting device 52 mounted on the movable carriage 51. Have. The movable carriage 51 is configured to be able to travel in a direction toward and away from the glass melting furnace 11 (melting tank 14). The lifting device 52 includes a support portion 53 that supports the frame 27 from the lower surface side, and a drive device 54 that lifts and lowers the support portion 53. As the driving device 54, for example, a hydraulic jack can be used.

  Next, the cutter 24 will be described.

  The cutter 24 is formed of a steel material (for example, SS material) or the like. The cutter 24 is formed in a long plate shape, and is disposed substantially vertically near the raw material inlet 13. A sharp blade portion may be provided at the lower end portion of the cutter 24.

  As shown in FIGS. 3 to 6, the cutter 24 moves between a standby position above the glass raw material G on the conveying surface 23 and an insertion position where the glass raw material G on the conveying surface 23 is inserted. Possible configuration.

  In the standby position, the lower surface 24 a of the cutter 24 is positioned above the glass raw material G on the transport surface 23. Therefore, at the standby position, the cutter 24 allows the movement of the glass material G on the transport surface 23. The standby position is appropriately set according to the thickness of the glass material G on the transport surface 23 and the like.

  In the insertion position, the lower surface 24a of the cutter 24 may be in contact with the transport surface 23 or may form a slight gap with the transport surface 23. Further, at the insertion position, both side surfaces 24 b of the cutter 24 form a slight gap with each of the pair of side plates 32 of the transport pan 22. Accordingly, at the insertion position, the cutter 24 restricts the movement of the glass raw material G on the conveyance surface 23.

  Each raw material supply apparatus 10 has an actuator 61, a first link 62, and a second as a moving mechanism 60 that moves the cutter 24 between the standby position and the insertion position, for example, as shown in FIGS. A link 63 is provided.

  The actuator 61 is for rotating the first link 62. For example, the actuator 61 includes an air cylinder or a hydraulic cylinder, and includes a cylinder 61a and a piston 61b that can slide in the cylinder 61a. The base end portion of the cylinder 61 a is rotatably connected to the outer surface of the hopper 21. The tip of the piston 61b is rotatably connected to one end of the first link 62.

  In the present embodiment, the base end portion of the cylinder 61a is rotatably connected to the hopper 21, but may be rotatably connected to one end portion of the first link 62. In this case, the tip of the piston 61b is rotatably connected to the hopper 21. In any case, the actuator 61 can rotate the first link 62.

  The first link 62 has a longitudinal intermediate portion 62a pinned to the outer surface of the hopper 21 and can rotate around the pin. The other end of the first link 62 is rotatably connected to one end of the second link 63.

  The second link 63 is inserted into the opening 18 provided in the dustproof plate 16 so as to be able to enter and exit. The dustproof plate 16 is provided with an accordion-like stretchable cover 19 for preventing the glass raw material G from scattering from the opening 18. The extendable cover 19 covers one end of the second link 63 and expands and contracts with the movement of the second link 63. The other end of the second link 63 is connected to the upper surface of the cutter 24.

  A pressure source of the actuator 61 is connected to the control device 28. Under the control of the control device 28, the first link 62 rotates in one direction (counterclockwise in FIGS. 5 and 8) or the other direction (clockwise in FIGS. 5 and 8) by the expansion and contraction of the actuator 61. When moved, the second link 63 moves, and the cutter 24 moves upward or downward.

  Next, operations of the transport pan 22 and the cutter 24 will be described with reference to FIGS. In addition, the work of the below-mentioned 1st-4th process is repeatedly performed for every predetermined period (for example, period of 1 minute-10 minutes) under control of the control apparatus 28. FIG.

  In the first step, as shown in FIGS. 3 to 5, the cutter 24 is raised from the insertion position to the standby position with the conveyance pan 22 stopped at the retracted position. When the cutter 24 is stopped at the standby position, the lower surface of the cutter 24 is positioned above the glass raw material G on the transport surface 23.

  In the second step, as shown in FIGS. 5 to 7, the transport pan 22 advances from the retracted position to the advanced position with the cutter 24 stopped at the standby position. Accordingly, the conveyance surface 23 moves forward, so that the glass material G is sent out (dropped) to the conveyance surface 23 from the gap 25 between the conveyance surface 23 and the hopper outlet 21b. In addition, while the conveyance pan 22 moves forward, the glass raw material G on the conveyance surface 23 is stably placed on the conveyance surface 23 by friction.

  Further, in the second step, as the transport pan 22 advances, the front end portion 22a of the transport pan 22 moves the glass raw material G floating on the molten glass L in the melting tank 14 to the downstream side of the melting tank 14 (clarification tank 15). To the side) and move it. Thereby, the space for throwing in the glass raw material G on the conveyance pan 22 is securable.

  If the glass raw material G on the transport pan 22 is introduced without securing a space, the glass raw material G introduced this time is deposited on the glass raw material G floating on the molten glass L introduced last time. It takes longer to melt.

  Moreover, since the glass raw material G which floats on the molten glass L moves to the downstream side (clarification tank 15 side) of the melting tank 14 as mentioned above, it can keep away from the low temperature raw material input port 13, and the glass raw material G Are sequentially sent out to the high temperature downstream side, so that melting of the glass raw material G is promoted.

  The height T (see FIG. 7) of the glass raw material G (including the portion submerged below the liquid surface of the molten glass L) moved to the downstream side by the front end 22a of the transport pan 22 is 50 mm to 200 mm. Is more preferable, it is more preferable that it is 70-150 mm, and it is especially preferable that it is 80-100 mm. When the height T is lower than 50 mm, the front end 22a of the transport pan 22 may come into contact with the molten glass L in the melting tank 14. On the other hand, when the height T is higher than 200 mm, it is difficult to effectively melt the glass raw material G.

  As a measuring method of the height T, after sticking the glass raw material G in the vertical direction, the bar is drawn from the glass raw material G in the vertical direction, and the portion of the undissolved glass raw material G adhering to the rod is measured. The method of doing is illustrated.

  In the third step, as shown in FIGS. 7 and 8, the cutter 24 is lowered from the standby position to the insertion position with the transport pan 22 stopped at the forward movement position. In this process, the cutter 24 is inserted into the glass raw material G on the conveyance surface 23. In a state where the cutter 24 is stopped at the insertion position, the lower surface of the cutter 24 is in contact with the conveyance surface 23 or slightly above the conveyance surface 23, so that the movement of the glass raw material G on the conveyance surface 23 is restricted. Is done.

  In the fourth step, as shown in FIGS. 8 and 3, the transport pan 22 is retracted from the advance position to the retract position with the cutter 24 stopped at the insertion position. Then, the cutter 24 stopped at the insertion position relatively pushes out at least a part of the glass raw material G downstream of the cutter 24 in the transport direction from the transport surface 23 and drops it onto the melting tank 14.

  Therefore, even when the fluidity of the glass raw material G on the conveying surface 23 is deteriorated (decreased), the glass raw material G is stably supplied to the glass melting furnace 11 by a certain amount (for example, 0.3 ton / hour) ˜1.3 tons / hour, preferably 0.5 tons / hour to 1.0 tons / hour).

  As described above, according to the present embodiment, the cutter 24 pushes out at least a part of the glass raw material G from the conveying surface 23 as the conveying pan 22 moves backward, and drops it onto the melting tank 14. Even when the property is deteriorated (decreased), the glass raw material G can be stably fed into the glass melting furnace 11 by a fixed amount.

  Further, according to the present embodiment, the front end portion 22 a of the transport pan 22 moves the glass raw material G floating on the molten glass L in the melting tank 14 to the downstream side of the melting tank 14 as the transport pan 22 advances. Therefore, a space for charging the glass material G on the transport pan 22 can be secured. Moreover, the glass raw material G which floats on the molten glass L in the melting tank 14 can be kept away from the low temperature raw material inlet 13, and it can prevent that the time until it melts becomes long.

  Moreover, according to this embodiment, since the conveyance pan 22 is cooled by the refrigerant path 33, the temperature rise of the glass raw material G on the conveyance surface 23 can be suppressed, and the quality change (from the glass raw material G of glass raw material G) can be suppressed. Release of water of hydration).

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications and substitutions can be made to the above-described embodiment without departing from the scope of the present invention. Can be added.

  For example, in the present embodiment, a plurality of (for example, two) raw material supply apparatuses 10 are installed side by side in the glass melting furnace 11, but only one may be installed.

  In the present embodiment, in the second step, the transport pan 22 is advanced from the retracted position to the advanced position while the cutter 24 is stopped at the standby position, but the present invention is not limited to this. For example, the transport pan 22 may advance from the retracted position to the advanced position while the cutter 24 is raised from the insertion position to the standby position.

  In the present embodiment, in the fourth step, the transport pan 22 is retracted from the advance position to the retract position with the cutter 24 stopped at the insertion position, but the present invention is not limited to this. For example, the transport pan 22 may be retracted from the advance position to the retract position while the cutter 24 is lowered from the standby position to the insertion position.

  Further, dry air may be blown into the hopper 21 and further into the upstream material silo (not shown).

  Moreover, this invention is applicable also to the glass raw material which does not contain a hydrate.

Although the invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
This application is based on Japanese Patent Application No. 2009-148058 filed on June 22, 2009, the contents of which are incorporated herein by reference.

  According to the present invention, it is possible to provide a raw material supply method and a raw material supply device, and a glass plate manufacturing apparatus and manufacturing method capable of stably feeding a glass raw material on a conveying surface into a glass melting furnace in a fixed amount. it can.

DESCRIPTION OF SYMBOLS 10 Raw material supply apparatus 11 Glass melting furnace 12 Molding furnace 13 Raw material inlet 14 Melting tank 21 Hopper 22 Transport pan 23 Transport surface 24 Cutter

Claims (12)

In a raw material supply method of dropping a glass raw material from a hopper onto a transport pan, reciprocating the transport pan in an inclined direction, and charging the glass raw material on the transport surface inclined of the transport pan into a melting tank of a glass melting furnace ,
When the transport pan advances from the transport direction upstream end to the transport direction downstream end, a cutter that can be inserted into the glass raw material on the transport surface moves to a standby position above the glass raw material on the transport surface,
When the transport pan retracts from the downstream end in the transport direction to the upstream end in the transport direction, the cutter moves to the glass raw material insertion position on the transport surface and stops at the insertion position along with the backward movement of the transport pan. A raw material supply method in which a cutter relatively pushes out at least a part of a glass raw material downstream of the cutter in the conveying direction from the conveying pan and puts it into the melting tank.   When the transport pan advances from the upstream end in the transport direction to the downstream end in the transport direction, the front end portion of the transport pan moves the glass raw material floating on the molten glass in the melting tank to the downstream side of the melting tank. 2. The raw material supply method according to 1. In the raw material supply method of dropping the glass raw material from the hopper onto the transport pan, reciprocating the transport pan and charging the glass raw material on the transport surface of the transport pan into the melting tank of the glass melting furnace,
When the transport pan advances from the transport direction upstream end to the transport direction downstream end, a cutter that can be inserted into the glass raw material on the transport surface moves to a standby position above the glass raw material on the transport surface,
When the transport pan retracts from the downstream end in the transport direction to the upstream end in the transport direction, the cutter moves to the glass raw material insertion position on the transport surface and stops at the insertion position along with the backward movement of the transport pan. The cutter extrudes at least a portion of the glass raw material downstream of the cutter in the transport direction relative to the transport pan, and puts it in the melting tank.
When the transport pan advances from the upstream end in the transport direction to the downstream end in the transport direction, the raw material supply for moving the glass raw material floating on the molten glass in the melting tank to the downstream side of the melting tank at the front end of the transport pan Method. The said glass raw material is a raw material supply method as described in any one of Claims 1-3 containing a hydrate. The raw material supply method according to claim 4 , wherein the hydrate is boric acid (H 3 BO 3). Claim 1-5 raw material supply method according to any one claim for cooling the conveyor pan. It has a transport pan that transports the glass raw material dropped from the hopper, and the transport pan is reciprocated in the tilt direction, and the glass raw material on the transport surface inclined of the transport pan is put into the melting tank of the glass melting furnace. In the raw material supply device
A cutter that can be inserted into the glass raw material on the transport surface,
When the transport pan advances from the transport direction upstream end to the transport direction downstream end, the cutter moves to a standby position above the glass raw material on the transport surface,
When the transport pan retracts from the downstream end in the transport direction to the upstream end in the transport direction, the cutter moves to the glass raw material insertion position on the transport surface and stops at the insertion position along with the backward movement of the transport pan. The raw material supply apparatus which a cutter pushes out at least one part of the glass raw material of a conveyance direction downstream rather than this cutter from the said conveyance bread | pan, and throws it into the said melting tank. When the transport pan advances from the upstream end in the transport direction to the downstream end in the transport direction, the front end portion of the transport pan moves the glass raw material floating on the molten glass in the melting tank to the downstream side of the melting tank. 7. The raw material supply apparatus according to 7 . In a raw material supply apparatus having a transport pan for transporting a glass raw material dropped from a hopper, reciprocating the transport pan, and charging the glass raw material on the transport surface of the transport pan into a melting tank of a glass melting furnace,
A cutter that can be inserted into the glass raw material on the transport surface,
When the transport pan advances from the transport direction upstream end to the transport direction downstream end, the cutter moves to a standby position above the glass raw material on the transport surface,
When the transport pan retracts from the downstream end in the transport direction to the upstream end in the transport direction, the cutter moves to the glass raw material insertion position on the transport surface and stops at the insertion position along with the backward movement of the transport pan. The cutter extrudes at least a portion of the glass raw material downstream of the cutter in the transport direction relative to the transport pan, and puts it in the melting tank.
When the transport pan advances from the upstream end in the transport direction to the downstream end in the transport direction, the raw material supply for moving the glass raw material floating on the molten glass in the melting tank to the downstream side of the melting tank at the front end of the transport pan apparatus. The raw material supply apparatus as described in any one of Claims 7-9 which further has a cooling means to cool the said conveyance pan. A raw material supply apparatus according to any one of claims 7 to 10, a glass melting furnace for melting a glass raw material supplied by the raw material supply apparatus, and forming molten glass melted in the glass melting furnace into a sheet glass An apparatus for producing a glass plate having a forming furnace. The manufacturing method of the glass plate which manufactures a glass plate using the manufacturing apparatus of the glass plate of Claim 11 .

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