CN116438144A - Glass forming device - Google Patents
Glass forming device Download PDFInfo
- Publication number
- CN116438144A CN116438144A CN202180071890.3A CN202180071890A CN116438144A CN 116438144 A CN116438144 A CN 116438144A CN 202180071890 A CN202180071890 A CN 202180071890A CN 116438144 A CN116438144 A CN 116438144A
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- Prior art keywords
- molded body
- support
- pressing device
- forming apparatus
- lever mechanism
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
- C03B17/06—Forming glass sheets
- C03B17/064—Forming glass sheets by the overflow downdraw fusion process; Isopipes therefor
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
- C03B17/06—Forming glass sheets
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
- C03B17/06—Forming glass sheets
- C03B17/068—Means for providing the drawing force, e.g. traction or draw rollers
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
Abstract
The glass forming apparatus (1) is provided with: a forming body (4) for forming a glass ribbon (3) from the molten glass (2) by an overflow downdraw method; support bricks (6, 7) which support the end of the upper part of the molded body (4) in the length direction from below and press the lower part of the molded body (4) in the length direction; a pressing device (8) for pressing the support brick (6) toward the molded body (4); and a forming furnace (9) for accommodating the forming body (4) therein, wherein the glass forming device (1) is configured such that the pressing device (8) is fixed to the forming furnace (9).
Description
Technical Field
The present invention relates to a glass forming apparatus.
Background
As is well known, as one of methods for manufacturing glass sheets, there is an overflow downdraw method. Patent document 1 discloses an example of manufacturing equipment capable of performing an overflow downdraw method.
The manufacturing apparatus disclosed in patent document 1 includes: a wedge-shaped forming body that forms a glass ribbon (sheet glass plate SG in this document) from molten glass; a pair of support bricks (in this document, a first support member 410 and a second support member 420) that support the molded body with the molded body sandwiched between one end side and the other end side in the longitudinal direction of the molded body; and a pressing device (in this document, a pressing device 422) that presses one of the pair of support bricks toward the molded body side.
In the above-described manufacturing facility, the supporting brick is pressed by the pressing device, and compressive stress in the longitudinal direction acts on the molded body. Thus, creep deformation of the formed body due to the self weight of the formed body, the weight of the molten glass, and the like is suppressed.
Prior art literature
Patent literature
Patent document 1: international publication No. 2012/132309
Disclosure of Invention
Problems to be solved by the invention
In the above-described manufacturing facility, the position of the molded body and the molded furnace in which the molded body is stored may be adjusted by moving the molded body before and during the operation. In this case, if the pressing device is fixed to, for example, a building, the position of the pressing device needs to be changed in accordance with the movement of the molded body or the like. Therefore, the operation of adjusting the position of the molded body or the like becomes complicated. In addition, a mechanism for changing the position of the pressing device is required, and the device structure becomes complicated.
In view of the above, an object of the present invention is to provide a manufacturing apparatus capable of easily adjusting the position of a molded body or the like while suppressing creep deformation of the molded body.
Means for solving the problems
The glass forming apparatus for solving the above problems comprises: forming a glass ribbon from the molten glass using an overflow downdraw method; a support brick that supports an end portion of the molded body in the longitudinal direction of the upper portion of the molded body from below and presses the lower portion of the molded body in the longitudinal direction; a pressing device for pressing the support brick to the forming body side; and a forming furnace for accommodating the forming body therein, wherein the pressing device is fixed to the forming furnace.
In the present glass forming apparatus, since the pressing device is fixed to the forming furnace, the pressing device moves together with the forming furnace. Therefore, when adjusting the position of the molded body or the like, the operation of changing the position of the pressing device is not required, and the operation becomes easy. In addition, a mechanism for changing the position of the pressing device is not required, and the device structure can be simplified.
In the above-described configuration, the molding furnace preferably includes a refractory brick wall surrounding the molded body, a heating device for heating the molded body from the side, and a frame for surrounding the refractory brick wall and the heating device and fixing the pressing device.
In this way, when creep deformation of the molded body is suppressed, the frame can be made to absorb the reaction force at the time of pressing when the pressing device presses the support brick to the molded body side. The frame surrounds both the refractory brick wall and the heating device, and the frame is disposed outside both, so that damage to the frame due to heat can be avoided.
In the above-described configuration, it is preferable that the support bricks are disposed on both one end side and the other end side in the longitudinal direction of the molded body, and the pressing device is configured to press only one of the support bricks, and the other support brick is held by the frame.
In this way, the pressing device is configured to press only one of the two support bricks, and therefore the structure of the apparatus can be further simplified. Further, the other support brick is held by the frame, so that the frame can absorb the reaction force.
In the above-described configuration, the frame preferably includes a pair of main frames disposed so as to correspond to both ends of the molded body in the longitudinal direction, respectively, and a rod provided to bridge the pair of main frames.
In this way, the reaction force can be appropriately absorbed by the lever. Further, by providing the rod to the frame, the risk of plastic deformation of the frame upon absorbing the reaction force can be eliminated as much as possible.
In the above-described structure, the rod is preferably disposed on both sides of the molded body with the molded body sandwiched therebetween.
In this way, the levers disposed on both sides of the molded body (one side and the other side sandwiching the molded body) can absorb the reaction force in good balance.
In the above-described structure, the rod preferably extends parallel to the longitudinal direction of the molded body.
In this way, the direction of the pressing force applied when the pressing device presses the support brick is the same as the extending direction of the lever, and therefore the frame can efficiently absorb the reaction force.
In the above-described configuration, the pressing device preferably has a lever mechanism configured to press the support brick by a force applied to the force point and amplified to act on the acting point, and the lever is preferably disposed at the same height as the fulcrum of the lever mechanism.
In this way, since the pressing device has the lever mechanism, and the pressing device presses the support brick by the force acting on the action point of the lever mechanism, it is advantageous in that the support brick is pressed with a large force. In addition, the lever is disposed at the same height as the fulcrum of the lever mechanism, so that the force in the far direction can be absorbed efficiently.
Effects of the invention
According to the glass forming apparatus of the present invention, the position of the forming body and the like can be easily adjusted while suppressing creep deformation of the forming body.
Drawings
Fig. 1 is a side view showing a glass forming apparatus.
Fig. 2 is a sectional view showing a section A-A in fig. 1.
Fig. 3 is a side view showing a modification of the glass forming apparatus.
Fig. 4 is a side view showing another modification of the glass forming apparatus.
Fig. 5 is an exploded view showing a part of the structure of another modification of the glass forming apparatus.
Detailed Description
Hereinafter, a glass forming apparatus according to an embodiment will be described with reference to the drawings. In the description of the embodiments, the X direction, the Y direction, and the Z direction shown in the drawings are orthogonal to each other.
As shown in fig. 1 and 2, a glass forming apparatus 1 (hereinafter, simply referred to as forming apparatus 1) includes: a forming body 4 for forming a glass ribbon 3 from the molten glass 2; a supply pipe 5 for supplying molten glass 2 to the forming body 4; a pair of support bricks 6, 7 which support the formed body 4; a pressing device 8 for pressing the support brick 6 of the two support bricks 6 and 7 toward the molded body 4; and a molding furnace 9 for accommodating the molded body 4 therein.
The molded body 4 and the two support bricks 6 and 7 are disposed in the molding furnace 9. The forming furnace 9 includes: a frame 10; a refractory brick wall 11 (only shown in fig. 2) disposed on the inner side of the enclosure by the frame 10 and surrounding the formed body 4; and a heating device 12 (only shown in fig. 2) disposed between the frame 10 and the refractory brick wall 11.
The frame 10 has a rectangular parallelepiped box-shaped outer shape long in the X direction, and also functions as a housing. The frame 10 includes: a pair of main frames 10a, 10b disposed in correspondence with both ends of the molded body 4 in the longitudinal direction; and a beam 10c and a rod 10d which are installed on the two main frames 10a and 10b. The frame 10 is made of metal, specifically carbon steel, stainless steel, heat-resistant steel, or the like. The Young's modulus of the metal constituting the frame 10 is preferably 80GPa or more, and more preferably 150GPa or more.
Each of the two main frames 10a and 10b has a skeleton structure formed by combining a plate body and a rod body extending in each direction of XYZ. The lower portions of the two main frames 10a, 10b hold the support bricks 6, 7, respectively. The beam 10c and the rod 10d extend parallel to the longitudinal direction of the molded body 4.
The beam 10c has at least four sides corresponding to four sides extending in the X direction of a rectangular parallelepiped shape of the frame 10.
The rods 10d sandwich the molded body 4 and are disposed on both sides of the molded body 4. That is, the rods 10d are arranged in a pair at an interval in the Y direction. The pair of rods 10d, 10d are each disposed at a height between the upper beam 10c and the lower beam 10c of the four beams 10 c. The pair of levers 10d and 10d are arranged at the same height as a fulcrum P3 of the lever mechanism 13 described later. In the case where the fulcrum P3 is present at a height between the upper end and the lower end of the frame 10 (here, a height between the upper beam 10c and the lower beam 10 c) as in the present embodiment, the lever 10d effectively functions by aligning the lever 10d with the height of the fulcrum P3 (details will be described later). The pair of bars 10d, 10d are fixed to the side of the two main frames 10a, 10b, respectively. That is, the pair of levers 10d and 10d sandwich the two main frames 10a and 10b therebetween. The cross-sectional shape (cross-sectional shape orthogonal to the X-direction) of the rod 10d may be any shape, and examples thereof are rectangular and circular.
Here, as a modification of the present embodiment, the rods 10d are not limited to only one pair, but a plurality of pairs may be provided in the frame 10. That is, in addition to the pair of levers 10d and 10d arranged at the same height as the fulcrum P3 of the lever mechanism 13, one or more pairs of levers 10d and 10d arranged at different heights from the fulcrum P3 may be provided in the frame 10. The respective bars 10d are not necessarily fixed to the sides of the two main frames 10a and 10b, and for example, the respective bars 10d may be fixed between the two main frames 10a and 10b with the respective bars 10d interposed therebetween. In this case, one end of each lever 10d is connected to the main frame 10a, and the other end of each lever 10d is connected to the main frame 10b.
The refractory brick wall 11 is formed of a plurality of refractory bricks, and is formed in a room shape to cover the molded body 4 from above and from the side. The refractory brick wall 11 includes a pair of plate-shaped refractory bricks 11a and 11a arranged at intervals in the Y direction. A pair of plate-shaped refractory bricks 11a, 11a is disposed on both sides of the formed body 4 with the formed body 4 sandwiched therebetween. Each plate-shaped refractory brick 11a contacts both support bricks 6 and 7 from the side. The refractory brick wall 11 is held by a not-shown heat insulating member (for example, refractory brick) in the frame 10.
The heating device 12 can heat the molded body 4 from the side via the plate-shaped refractory bricks 11a. The heating device 12 sandwiches the molded body 4 and is disposed on both sides of the molded body 4. The heating devices 12 are arranged in plural numbers along the longitudinal direction of the molded body 4 on both sides sandwiching the molded body 4. The plurality of heating devices 12 are each in contact with the plate-shaped refractory bricks 11a in a state of being attached to a beam (a beam other than the four beams 10 c) which is provided in the frame 10 and is not shown. In the present embodiment, a plate heater is used as the heating device 12. Needless to say, the present invention is not limited to this, and a heater other than a plate heater may be used as the heating device 12 as a modification of the present embodiment.
The forming furnace 9 is formed with an opening 9a for allowing the inside and outside of the furnace to be continuous. The opening 9a is formed at a position corresponding to the support brick 6, and a part of the surface of the support brick 6 is exposed at the opening 9a.
The molded body 4 is a molded body for an overflow downdraw method having a wedge-shaped cross-sectional shape (a cross-sectional shape orthogonal to the X direction). The formed body 4 is made of refractory bricks of dense zircon, alumina-based, zirconia-based, and the like.
After the molten glass 2 is flowed into a trough (not shown) formed in the upper portion of the forming body 4, the forming body 4 causes the molten glass 2 overflowed from the trough to both sides to flow down along a pair of side surfaces 4b, 4b (only one of the pair is shown in fig. 1) of the forming body 4. Thereafter, the molten glass 2 flowing down the both side surfaces 4b, 4b is caused to merge at the lower end 4c of the forming body 4. Then, the glass ribbon 3 is formed from the molten glass 2 joined at the lower end 4 c.
The dimension of the molded body 4 in the longitudinal direction is, for example, 1500mm to 6000mm. The frame 10 is effective when the molded article 4 is large, and therefore the lower limit of the dimension along the longitudinal direction of the molded article 4 is preferably 2000mm or more, 2500mm or more, 3000mm or more, 3500mm or more, and particularly preferably 4000mm or more.
The supply pipe 5 supplies the molten glass 2 to the forming body 4 from one end in the longitudinal direction of the forming body 4.
The pair of support bricks 6 and 7 support the longitudinal end of the molded body 4 from below and press the molded body 4 in the longitudinal direction. Specifically, both ends in the longitudinal direction of the molded body 4 in the upper portion of the molded body 4 are placed on the upper surfaces of the pair of support bricks 6, 7, and the molded body 4 is supported in a stretched state. The pair of support bricks 6 and 7 each have a pressing surface S for pressing the molded body 4, and the molded body 4 is pressed in the longitudinal direction in a state where the pressing surface S is in surface contact with the longitudinal end surface 4d of the lower portion of the molded body 4. The pressing surfaces S of the support bricks 6 and 7 and the end surface 4d of the molded body 4 are both vertical planes, but may be inclined planes or curved planes. The support bricks 7 of the two support bricks 6 and 7 are held so as not to move along the longitudinal direction of the molded body 4. On the other hand, the support brick 6 can move toward the molded body 4 side in association with the pressing by the pressing device 8. In the present embodiment, the support brick 7 is fixed to the frame 10, and the support brick 6 is movably held by the frame 10 along the longitudinal direction of the molded body 4.
The pressing device 8 is disposed on the opposite side of the supply pipe 5 in the longitudinal direction of the molded body 4. The pressing device 8 presses only the support brick 6 of the pair of support bricks 6, 7. The pressing device 8 presses the support bricks 6, thereby applying a compressive stress in the longitudinal direction to the molded body 4 sandwiched between the support bricks 6 and 7. This suppresses creep deformation due to the weight of the molded body 4 or the like.
The pressing device 8 includes: a lever mechanism 13 that amplifies a force applied to the force point P1 and acts on the action point P2; and a cylinder 14 as an actuator, which becomes a generation source of force applied to the force point P1. The pressing device 8 presses the support brick 6 with a force acting on the action point P2.
Here, in the present embodiment, the cylinder 14 is used as the actuator, but is not limited thereto. As a modification of the present embodiment, a hydraulic cylinder, a mechanical jack, a ball screw mechanism, or the like may be used instead of the cylinder 14. Further, as a force generation source, a counterweight may be used instead of the actuator.
The lever mechanism 13 includes: an arm member 15 having a pressure receiving portion 15a and a pressing portion 15b; and a holding member 17 that holds the arm member 15 in a state in which the arm member 15 is allowed to swing about the fulcrum P3.
The arm member 15 is a member that is long in one direction extending up and down. The pressure receiving portion 15a located on the upper end side of the arm member 15 is a portion that receives a force generated by the cylinder 14, and is a portion corresponding to the force point P1. On the other hand, the pressing portion 15b located on the lower end side of the arm member 15 is a portion for pressing the support brick 6, and is a portion corresponding to the action point P2. The distance L1 from the fulcrum P3 to the force point P1 is longer than the distance L2 from the fulcrum P3 to the action point P2. The distance L1 is preferably 1.2 to 3.0 times the distance L2.
The pressing portion 15b of the arm member 15 is constituted by a disk body rotatable about the shaft 16. That is, the pressing portion 15b is rotatably held by the shaft 16 at the lower end portion of the arm member 15. The shaft 16 extends parallel to a rod 17a to be described later provided in the holding member 17.
The holding member 17 is fixed relative to the outer surface 10e of the frame 10. That is, the lever mechanism 13 is in a state of being fixed to the outer surface 10e of the frame 10 via the holding member 17. The holding member 17 has a rod body 17a penetrating the arm member 15 in a state extending in the Y direction, and the rod body 17a becomes a center axis of swing of the arm member 15 and becomes a fulcrum P3 of the lever mechanism 13.
An end portion of the cylinder 14 (an end portion located on the opposite side to the front end of the piston rod) is fixed to a pressure receiving portion 15a of the arm member 15. The cylinder 14 is disposed between the pressure receiving portion 15a of the arm member 15 and the outer surface 10e of the frame 10 at a position above the rod body 17a (fulcrum P3) provided in the holding member 17.
The piston rod of the cylinder 14 is brought into contact with the outer surface 10e of the frame 10. The piston rod extends in a direction orthogonal to the longitudinal direction of the arm member 15, and a front end (a portion directly contacting the outer surface 10e of the frame 10) of the piston rod is formed as a convex curved surface.
The center of gravity of the cylinder 14 is located on the opposite side of the outer surface 10e of the frame 10 with respect to the rod 17a (fulcrum P3) in the X direction. Thereby, the cylinder 14 generates moment by its own weight, which is a clockwise force (clockwise in fig. 1) around the rod 17 a.
When the cylinder 14 is operated, the output portion of the cylinder 14, i.e., the piston rod, presses the outer surface 10e of the frame 10. The force is applied to the pressure receiving portion 15a of the arm member 15 by the reaction force at this time. The force received by the pressure receiving portion 15a is amplified by the lever mechanism 13, and then the force presses the support brick 6. In addition, the support brick 6 is further pressed by the moment of the force generated by the self weight of the cylinder 14.
The pair of levers 10d and 10d may be arranged at the same height as the fulcrum P3 of the lever mechanism 13 or at a different height. From the viewpoint of efficiently absorbing the reaction force, the difference between the height of the pair of levers 10d, 10d and the height of the fulcrum P3 of the lever mechanism 13 is preferably 200mm or less, more preferably 150mm or less, and even more preferably the same as the height of the fulcrum P3 of the lever mechanism 13.
Here, as described above, the pair of levers 10d and 10d are arranged at the same height as the fulcrum P3 of the lever mechanism 13. Thus, when the support brick 6 is pressed by the pressing device 8, the following effects are obtained by the lever 10d. When the support brick 6 is pressed by the pressing device 8, a force (reaction force) directed away from the formed body 4 acts on a portion of the frame 10 corresponding to the height at which the fulcrum P3 is present. However, the force can be efficiently absorbed by the lever 10d disposed at the same height as the fulcrum P3.
The holding member 17 and the cylinder 14 provided to the lever mechanism 13 are disposed outside the forming furnace 9. On the other hand, the arm member 15 provided in the lever mechanism 13 is disposed so as to extend across the inside and outside of the forming furnace 9 through the opening 9a. Specifically, the entirety of the pressure receiving portion 15a of the arm member 15 is located outside the forming furnace 9, whereas at least a portion of the pressing portion 15b of the arm member 15 corresponding to the operating point P2 enters the forming furnace 9.
Here, as a modification of the present embodiment, a part of the support brick 6 may be projected out of the molding furnace 9 through the opening 9a of the molding furnace 9, and the projected portion may be pressed by the pressing portion 15b of the arm member 15. In this case, the whole pressing portion 15b of the arm member 15 is located outside the forming furnace 9.
Hereinafter, the main operation and effects of the molding apparatus 1 described above will be described.
In the molding apparatus 1 described above, the pressing device 8 is fixed to the molding furnace 9. Specifically, the holding member 17 of the pressing device 8 is fixed to the outer surface 10e of the frame 10, whereby the pressing device 8 is fixed to the forming furnace 9. Therefore, when the position of the forming furnace 9 is adjusted, the pressing device 8 having the cylinder 14, the arm member 15, and the holding member 17 can be moved integrally with the forming furnace 9. Therefore, when adjusting the position of the molded body 4 or the like, the operation of changing the position of the pressing device 8 is unnecessary, and the operation becomes easy. In addition, a mechanism for changing the position of the pressing device 8 is not required, and the device structure can be simplified.
Here, the following modifications can be applied to the above-described embodiment.
In the above-described embodiment, the rod 10d provided in the frame 10 extends parallel to the longitudinal direction of the molded body 4, but as a modification, a configuration as shown in fig. 3 may be adopted. In this embodiment, the two rods 10d extend along the diagonal of the rectangle formed by the frame 10 in side view. As a further modification, one of the two rods 10d may be omitted.
In the lever mechanism 13 of the above embodiment, the cylinder 14 is fixed to the arm member 15, but the cylinder 14 may be fixed to the forming furnace 9. Further, the fulcrum P3 is located above the action point P2 and the force point P1 is located above the fulcrum P3, but the fulcrum P3 may be located below the action point P2 and the force point P1 may be located below the fulcrum P3.
In the pressing device 8 of the above embodiment, the actuator (the cylinder 14) which is the source of the force is pressed against the support brick 6 via the lever mechanism 13, but the actuator (the source of the force) may be pressed against the support brick 6 via another mechanism, or the actuator may be directly pressed against the support brick 6. As a force generation source, a weight may be used instead of the actuator, and for example, the support brick 6 may be pressed by converting a downward force generated by the weight of the weight into a lateral direction by the lever mechanism 13 or the like.
The pressing device 8 of the above embodiment has a single lever mechanism 13, but may have two lever mechanisms. This will be described below.
As shown in fig. 4, the lever mechanism 13 of the pressing device 8 is composed of a first lever mechanism 21 on the upper side and a second lever mechanism 22 on the lower side. The first lever mechanism 21 includes a first arm member 23 provided with an air cylinder 14 and a pressure receiving portion 15a (including a first force point P1 a) at an upper end. The second lever mechanism 22 includes a second arm member 24 provided with a pressing portion 15b (including a second operating point P2 b) at a lower end thereof via the shaft 16.
The first fulcrum P3a of the first lever mechanism 21 is constituted by a shaft protruding portion 25 fixed to the lower end portion of the first arm member 23, and is disposed on the upper portion of the holding member 17. The shaft protruding portion 25 does not penetrate the second arm member 24. The first operating point P2a of the first lever mechanism 21 is constituted by a shaft 27 of a rod body supported by the intermediate portion in the vertical direction of the first arm member 23, and is inserted into a long hole 26 formed in the upper end portion of the second arm member 24.
The second fulcrum P3b of the second lever mechanism 22 is constituted by a shaft 28 of a rod body disposed at the lower portion of the holding member 17, and supports the intermediate portion of the second arm member 24 in the up-down direction. The second force point Plb of the second lever mechanism 22 is constituted by the shaft 27 of the rod body described above. Therefore, the shaft 27 of the rod is configured to serve as both the first point of action P2a of the first lever mechanism 21 and the second point of force P1b of the second lever mechanism 22.
The detailed structure of the lever mechanism 13 will be described with reference to fig. 5. As shown in the figure, the first arm member 23 of the first lever mechanism 21 includes two first arm plates 23a arranged in parallel at a first predetermined interval. The shaft 27 of the rod body serving as both the first point of application P2a and the second point of application P1b is fixed across the two first arm plates 23a. The shaft protruding portions 25 constituting the first pivot point P3a are provided protruding from the outer side surfaces 23aa of the two first arm plates 23a, respectively. These shaft protrusions 25 are supported by shaft holes 29 formed in the upper portion of the holding member 17.
The second arm member 24 of the second lever mechanism 22 includes two second arm plates 24a arranged in parallel at a second predetermined interval smaller than the first predetermined interval. Long holes 26 are formed in the upper end portions of the two second arm plates 24a, respectively, to be longer in the vertical direction. The shaft 27 of the rod is inserted into these elongated holes 26. The shaft 27 of the rod body is allowed to move relative to the longitudinal direction of the long hole 26 and is restricted from moving relative to the width direction orthogonal thereto. Shaft holes 30 are formed in the middle of the two second arm plates 24a in the up-down direction, respectively. These shaft holes 30 are fitted into the shaft 28 of the rod body constituting the second fulcrum P3b supported by the lower portion of the holding member 17.
The distance L1a from the first fulcrum P3a to the first force point P1a of the first lever mechanism 21 is, for example, 1.5 to 10 times the distance L2a from the first fulcrum P3a to the first action point P2 a. On the other hand, the distance L1b from the second fulcrum P3b to the second force point P1b of the second lever mechanism 22 slightly fluctuates with the rotational movement of the first arm member 23, but is, for example, 1.5 to 10 times the distance L2b from the second fulcrum P3b to the second action point P2 b.
Next, the operational effects of the molding apparatus 1 according to the fifth embodiment having the above-described configuration will be described. When the cylinder 14 is operated, the output of the cylinder 14, i.e. the piston rod, presses against the outer surface 10e of the forming furnace 9. The force is applied to the pressure receiving portion 15a (the first force point P1a of the first lever mechanism 21) provided at the upper end of the first arm member 23 by the reaction force at this time. The force received by the pressure receiving portion 15a is amplified by the first lever mechanism 21, and a moment of the clockwise force about the shaft convex portion 25 (the first fulcrum P3a of the first lever mechanism 21) acts on the shaft 27 of the rod body (the first acting point P2a of the first lever mechanism 21).
At this time, the force generated at the shaft 27 of the rod (the second force point P1b of the second lever mechanism 22) is amplified by the second lever mechanism 22, and the moment of the clockwise force about the shaft 28 of the rod (the second fulcrum P3b of the second lever mechanism 22) acts on the pressing portion 15b (the second action point P2b of the second lever mechanism 22) provided at the lower end of the second arm member 24. Thereby, a pressing force is applied to the support brick 6.
In the present embodiment, the force acting on the first force point P1a by the operation of the cylinder 14 is amplified by 1.5 to 10 times by the first lever mechanism 21 and further amplified by 1.5 to 10 times by the second lever mechanism 22, whereby the support brick 6 is given from the second point of action P2 b. Thus, according to the molding apparatus 1 of the fifth embodiment, a stronger pressing force can be applied to the support brick 6 than in the case of having a single lever mechanism.
Here, the lever mechanisms 21 and 22 are provided, but three or more lever mechanisms may be provided.
Description of the reference numerals
1. Glass forming device
2. Molten glass
3. Glass ribbon
4. Molded body
6. Support brick
7. Support brick
8. Pressing device
9. Forming furnace
10. Frame
10a Main frame
10b Main frame
10d rod
10e outer surface
11. Refractory brick wall
12. Heating device
13. Lever mechanism
P1 force point
P2 action Point
And P3 is a fulcrum.
Claims (7)
1. A glass forming apparatus includes:
forming a glass ribbon from the molten glass using an overflow downdraw method;
a support brick that supports an end portion of the molded body in a longitudinal direction of an upper portion of the molded body from below and presses a lower portion of the molded body in the longitudinal direction;
a pressing device that presses the support brick toward the molded body; and
a molding furnace for accommodating the molded body therein,
the glass forming apparatus is characterized in that,
the pressing device is fixed on the forming furnace.
2. A glass forming apparatus according to claim 1, wherein,
the forming furnace has a refractory brick wall surrounding the formed body, a heating device for heating the formed body from the side, and a frame surrounding the refractory brick wall and the heating device and fixing the pressing device.
3. A glass forming apparatus according to claim 2, wherein,
the support bricks are disposed at both one end side and the other end side in the longitudinal direction of the molded body,
the pressing device is configured to press only one of the two support bricks,
the other of the two support bricks is held by the frame.
4. A glass forming apparatus according to claim 2 or 3, wherein,
the frame includes a pair of main frames disposed so as to correspond to both ends of the molded body in the longitudinal direction, respectively, and a rod provided to the pair of main frames.
5. The glass forming apparatus according to claim 4, wherein,
the rod is disposed on both sides of the molded body with the molded body sandwiched therebetween.
6. A glass forming apparatus according to claim 4 or 5, wherein,
the rod extends parallel to the longitudinal direction of the molded body.
7. The glass forming apparatus according to claim 6, wherein,
the pressing device has a lever mechanism configured to press the support brick with a force that is amplified to act on the acting point after being applied to the force point,
the lever is disposed at the same height as the fulcrum of the lever mechanism.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020208616 | 2020-12-16 | ||
| JP2020-208616 | 2020-12-16 | ||
| PCT/JP2021/045701 WO2022131177A1 (en) | 2020-12-16 | 2021-12-10 | Glass molding apparatus |
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| Publication Number | Publication Date |
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| CN116438144A true CN116438144A (en) | 2023-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180071890.3A Pending CN116438144A (en) | 2020-12-16 | 2021-12-10 | Glass forming device |
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| Country | Link |
|---|---|
| JP (1) | JPWO2022131177A1 (en) |
| KR (1) | KR20230121597A (en) |
| CN (1) | CN116438144A (en) |
| WO (1) | WO2022131177A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118637812A (en) * | 2024-08-12 | 2024-09-13 | 中建材玻璃新材料研究院集团有限公司 | Microcrystalline glass distributing and forming device |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3437470A (en) * | 1966-06-17 | 1969-04-08 | Corning Glass Works | Constant force internal support for glass overflow wedge |
| US3519411A (en) * | 1966-12-28 | 1970-07-07 | Corning Glass Works | Method and apparatus for supporting sheet glass forming device |
| US6895782B2 (en) * | 2002-08-08 | 2005-05-24 | Richard B. Pitbladdo | Overflow downdrawn glass forming method and apparatus |
| JP4193115B2 (en) * | 2003-03-20 | 2008-12-10 | 日本電気硝子株式会社 | Sheet glass forming apparatus and sheet glass forming method |
| JP2006298736A (en) * | 2005-04-25 | 2006-11-02 | Nippon Electric Glass Co Ltd | Apparatus for forming plate glass, supporting member for apparatus for forming plate glass and method for forming plate glass |
| WO2008140682A1 (en) * | 2007-05-11 | 2008-11-20 | Corning Incorporated | Isopipe sag control using improved end support conditions |
| WO2010024937A2 (en) * | 2008-08-29 | 2010-03-04 | Corning Incorporated | Isopipes having improved dimensional stability |
| JPWO2012132309A1 (en) * | 2011-03-28 | 2014-07-24 | ＡｖａｎＳｔｒａｔｅ株式会社 | Glass plate manufacturing method and glass plate manufacturing apparatus |
| KR102412622B1 (en) * | 2014-12-19 | 2022-06-23 | 코닝 인코포레이티드 | Method and apparatus for isopipe support and sag mitigation |
| JP2020045261A (en) * | 2018-09-20 | 2020-03-26 | 日本電気硝子株式会社 | Molding device, and plate glass manufacturing method |
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2021
- 2021-12-10 KR KR1020237008810A patent/KR20230121597A/en active Search and Examination
- 2021-12-10 CN CN202180071890.3A patent/CN116438144A/en active Pending
- 2021-12-10 WO PCT/JP2021/045701 patent/WO2022131177A1/en active Application Filing
- 2021-12-10 JP JP2022569960A patent/JPWO2022131177A1/ja active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118637812A (en) * | 2024-08-12 | 2024-09-13 | 中建材玻璃新材料研究院集团有限公司 | Microcrystalline glass distributing and forming device |
| CN118637812B (en) * | 2024-08-12 | 2024-11-05 | 中建材玻璃新材料研究院集团有限公司 | Microcrystalline glass distributing and forming device |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20230121597A (en) | 2023-08-18 |
| JPWO2022131177A1 (en) | 2022-06-23 |
| WO2022131177A1 (en) | 2022-06-23 |
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