An edge plate clamping device for overflow method substrate glass forming and its working method

Abstract

The present invention discloses an edge plate clamping device for overflow method substrate glass forming and its working method, which includes a pulling edge unit, pulling edge clamping rollers, a cooling air duct and air outlet holes; the pulling edge unit is connected to the pulling edge clamping rollers, the pulling edge clamping rollers are hollow conical structures, one end of the cooling air duct is conical, the conical end of the cooling air duct is inserted into the cavity of the pulling edge clamping rollers, and a plurality of air outlet holes are formed on the side surface of the conical end of the cooling air duct. The cooling air can directly blow to the effective area on the side surface of the pulling edge clamping rollers, can quickly cool the edge part of the glass plate, effectively resist the inward shrinkage of the width of the glass plate, improve the quality of the edge plate, and improve the stability of the substrate glass forming production.

Description

Technical Field

[0001] The present invention belongs to the field of substrate glass manufacturing equipment, and in particular to an overflow method substrate glass forming side plate clamping device and its working method. Background Art

[0002] In the production of overflow method substrate glass, the high-temperature flowing glass flows down from both sides of the overflow brick and converges at the tip of the brick, and continues to flow down under the action of the self-weight of the glass. As the temperature decreases, the highly viscous glass gradually transforms into an elastoplastic state. At the same time, due to the change of the internal structure of the glass, the flat glass will shrink inward in the plate width direction, not only the width cannot be guaranteed, but also the thickness uniformity is difficult to guarantee. Therefore, in this temperature region, a set of edge roller clamping devices is added at the position of the glass side plate. When the molten glass flows down through the diversion plate, under the action of the clamping and rapid cooling of the clamping rollers, the glass plate no longer shrinks inward and is maintained within a certain width range, and then enters the temperature precision control region of forming, and after gradual cooling, forming, annealing, finally meets the requirements of qualified products. However, the clamping rollers of the edge roller in the prior art are a pair of cylindrical hollow structures. During the clamping and cooling process, due to the rapid cooling and thickness increase at the edge clamping, and at the same time, the natural inward shrinkage of the glass plate during cooling causes the thickness to be thinner in the transition zone between the clamping edge of the glass plate and the effective period, resulting in subsequent cutting and breaking of the plate and affecting normal production. At the same time, the cooling method is to directly pass cooling air into the hollow roller cavity, which also has a certain impact on the temperature field of the normal area of the glass plate while cooling the clamping edge of the glass, and seriously affects the flow stability of the glass, and even leads to the generation of crystallization, resulting in quality defects such as product weight fluctuation and plate width fluctuation. Summary of the Invention

[0003] The purpose of the present invention is to solve the problems in the prior art, and provide an overflow method substrate glass forming side plate clamping device and its working method, which reduce the ineffective heat loss and thermal influence at the end face, and achieve the purpose of improving production efficiency and equipment service life.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] An overflow method substrate glass forming side plate clamping device, including a pulling unit, a pulling clamping roller, a cooling air duct and air outlet holes;

[0006] The pulling unit is connected to the pulling clamping roller. The pulling clamping roller is a hollow conical structure. One end of the cooling air duct is conical. The conical end of the cooling air duct is inserted into the cavity of the pulling clamping roller, and a plurality of air outlet holes are arranged on the side surface of the conical end of the cooling air duct.

[0007] Further, the cavity of the pulling clamping roller is a conical structure with uniform wall thickness.

[0008] Furthermore, the taper of the cooling air duct is opposite to that of the edge-pulling clamping roller.

[0009] Furthermore, the edge-pulling unit is arranged outside the furnace body, and the edge-pulling clamping roller is installed on the edge-pulling shaft in the edge-pulling unit.

[0010] Furthermore, the edge-pulling clamping roller extends into the furnace body through the edge-pulling shaft.

[0011] Furthermore, the edge-pulling clamping roller clamps the edge surface of the glass plate through the side surface of the conical top.

[0012] Furthermore, the taper angle of the conical end of the cooling air duct is 30 - 45°.

[0013] Furthermore, the clamping angle of the edge-pulling clamping roller is 45 - 60°.

[0014] A working method of the edge plate clamping device for overflow method substrate glass forming includes the following steps:

[0015] Cooling air quickly enters the conical end of the cooling air duct and is discharged from a number of air outlet holes on the side surface of the conical end, directly blowing the side part of the inner cavity of the edge-pulling clamping roller, that is, the area clamping the glass. The edge-pulling clamping roller clamps the edge of the glass plate and quickly cools it. The highly heated glass plate quickly transfers heat through the metal edge-pulling clamping roller. After heat exchange with the cooling air, the heat exchange return air is discharged from the furnace body;

[0016] While the edge-pulling clamping roller clamps and cools the glass plate, the side surface of the conical top of the edge-pulling clamping roller simultaneously applies an inward lateral component force to the clamping area of the glass plate, causing the glass in the clamping area to slowly transition to the transition area.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention provides an edge plate clamping device for overflow method substrate glass forming. By designing a set of conical edge-pulling clamping rollers and inserting a cooling air duct into the cavity of the edge-pulling clamping roller, the front end of the cooling air duct is also a conical structure. When the cooling air enters the cavity of the conical edge-pulling clamping roller through the air outlet holes on the conical side surface of the cooling air duct, the cooling air can directly blow to the effective area on the side surface of the edge-pulling clamping roller, which can quickly cool the edge of the glass plate, effectively resist the inward shrinkage of the width of the glass plate, improve the quality of the edge plate, and improve the stability of the substrate glass forming production. At the same time, since the front end of the conical air duct uses side air exhaust, the cooling air does not directly contact the front end surface of the edge-pulling clamping roller, reducing the temperature influence on the non-clamping area and the ineffective heat loss of the end surface, improving the production efficiency and production stability, and at the same time increasing the service life of the equipment.

[0019] Furthermore, the edge-pulling clamping roller of the present invention is of a conical structure. While clamping and cooling the glass plate, the side surface of the conical top will apply a certain component force inward on the glass plate, promoting the gentle transition of the glass in the clamping area to the transition area, which can improve the phenomenon of too thin thickness in the transition area of the glass edge plate. Even if there are no obvious low pits in the clamping area, transition area and effective area, it ensures the normal cutting and breaking actions in subsequent processes and realizes the stability of production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic diagram of the edge-pulling and glass state of the overflow forming of the glass substrate of the present invention.

[0022] Figure 2 It is a schematic diagram of the conical roller structure of the present invention.

[0023] Figure 3 It is a schematic diagram of the roller clamping and glass state of the present invention.

[0024] Wherein: 1 - overflow brick, 2 - glass plate, 21 - molten glass, 22 - cross-section of the glass plate, 3 - edge-pulling unit, 31 - edge-pulling clamping roller, 32 - front end face of the roller, 4 - cooling air duct, 41 - air outlet hole, 42 - cooling air, 43 - heat exchange return air, 5 - furnace body, 6 - thickness range distribution curve, A - clamping area, B - transition area, C - effective area, a - clamping angle of the conical roller, b - conical angle of the end face of the cooling air duct, h1 - high point of the thickness in the clamping area, h2 - low point of the thickness in the transition area, h3 - average thickness of the effective area. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0027] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

[0028] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, terms such as "first", "second", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0029] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0030] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "coupled" are to be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The present invention will be further described in detail below with reference to the accompanying drawings:

[0032] The present invention provides an edge plate clamping device for overflow method substrate glass forming, which includes a pulling edge unit 3, a pulling edge clamping roller 31, a front end face 32 of the roller, a cooling air duct 4 and an air outlet hole 41. The pulling edge unit 3 is arranged outside the furnace body 5, the pulling edge clamping roller 31 is installed on the pulling edge shaft in the pulling edge unit 3, and the pulling edge clamping roller 31 extends into the furnace body 5 through the pulling edge shaft. The clamping unit includes a set of pulling edge clamping rollers 31 for clamping the glass and a set of cooling air ducts 4. The pulling edge clamping roller 31 has a conical shape, and the inside is also a conical cavity with a uniform wall thickness. The pulling edge clamping roller 31 clamps the edge surface of the glass plate 2 through the side surface of the conical top. The front end of the cooling air duct 4 is a conical structure, the conical end of the cooling air duct 4 is inserted into the cavity of the pulling edge clamping roller 31, and a plurality of air outlet holes 41 are arranged on the side surface of the conical end of the cooling air duct 4. The cooling air 42 enters the cavity of the conical pulling edge clamping roller 31 through the air outlet holes 41 on the side surface of the conical front end of the cooling air duct 4, which can quickly cool the edge of the glass plate 2 while maximizing the thickness of the edge transition zone B, improving the quality of the edge plate, and enhancing the production stability of the substrate glass forming.

[0033] As Figure 1 shown, the molten glass 21 flows down from both sides of the overflow brick 1 and converges at the tip of the brick to form the glass plate 2. The pulling edge unit 3 is arranged outside the furnace body 5, the pulling edge clamping roller 31 is inserted into the furnace body 5, and the glass plate 2 is clamped. As Figure 2 shown, the pulling edge clamping roller 31 is a conical structure, the clamping angle of the conical roller is 45 - 60°, the front end of the cooling air duct 4 is also conical, the conical angle of the end face of the cooling air duct 4 is 30 - 45°, and the conical direction of the cooling air duct 4 is opposite to that of the pulling edge clamping roller 31. Uniformly distributed air outlet holes 41 are arranged on the side surface of the conical front end of the cooling air duct 4. The cooling air 42 enters through the cooling air duct 4 and is discharged from the air outlet holes 41 on the conical side surface, directly blowing to the side part of the inner cavity of the pulling edge clamping roller 31, that is, the glass clamping area. The actual clamping effect state is as Figure 3 shown, the pulling edge clamping roller 31 clamps the edge of the glass plate 2 and quickly cools it, and the thicknesses of the clamping area A, the transition area B and the effective area C are uniformly transitioned, that is, h1 > h2 > h3, and the thickness range distribution curve 6 is above the lower deviation.

[0034] After the molten glass 21 flows down from the overflow brick 1, the temperature of the glass is relatively high at this time and it is in a high viscous state. The pulling edge clamping roller 31 clamps the edge clamping area A on both corresponding sides, and at the same time, the cooling air 42 quickly passes through the conical cavity at the front end of the cooling air duct 4 and is discharged from the air outlet holes 41 on the side surface, blowing to the inner side of the pulling edge clamping roller 31. The high-temperature glass plate 2 transfers heat quickly through the metal roller and exchanges heat with the cooling air 42 to form the heat exchange return air 43, which is discharged from the furnace body 5, so as to realize the rapid cooling of the clamping area A of the glass plate 2 and ensure that the width of the glass plate does not shrink inward anymore.

[0035] Meanwhile, the edge-pulling clamping roller 31 of the present invention has a conical structure. While clamping and cooling the glass plate 2, a lateral force directed inward is applied to the clamped glass by the side surface of the edge-pulling clamping roller 31. While ensuring that the glass plate 2 does not contract inward further, the glass in the clamping area A slowly transitions to the transition area B, so that there are no obvious low pits in the clamping area A, the transition area B, and the effective area C. As shown in Figure 3 the figure, there is no area in the thickness range difference distribution curve 6 below the lower deviation, ensuring the normal cutting and breaking actions in subsequent processes and realizing the stability of production.

[0036] In addition, the front end of the conical cooling air duct 4 adopts side air exhaust, and the cooling air 42 does not directly blow to the front end surface 32 of the roller. That is, the end of the edge-pulling clamping roller 31 is no longer in direct contact with the cooling medium, effectively reducing the influence of the front end surface 32 of the roller on the temperature field of the normal area and further improving the production stability.

[0037] The present invention also provides a working method for the edge plate clamping device of the overflow method substrate glass forming:

[0038] The cooling air 42 quickly enters the conical end of the cooling air duct 4 and is discharged from a number of air outlet holes 41 on the side of the conical end, directly blowing to the side part of the inner cavity of the edge-pulling clamping roller 31, that is, the area clamping the glass. The edge-pulling clamping roller 31 clamps the edge of the glass plate 2 and quickly cools it. The highly heated glass plate 2 quickly transfers heat through the metal edge-pulling clamping roller 31. After heat exchange with the cooling air 42, the heat exchange return air 43 is discharged from the furnace body 5;

[0039] While the edge-pulling clamping roller 31 clamps and cools the glass plate 2, a lateral force directed inward is applied to the clamping area A of the glass plate 2 by the side surface of the conical top of the edge-pulling clamping roller 31, causing the glass in the clamping area A to slowly transition to the transition area B.

[0040] The present invention can not only achieve the rapid cooling of the glass edge, effectively resist the inward contraction of the glass, but also increase the thickness of the edge plate transition area and reduce the temperature influence on the non-clamped area.

[0041] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An edge plate clamping device for overflow method substrate glass forming, characterized in that, it includes a rabbet unit (3), rabbet clamping rollers (31), a cooling air duct (4) and air outlets (41); The rabbet unit (3) is connected to the rabbet clamping rollers (31), the rabbet clamping rollers (31) are hollow conical structures, one end of the cooling air duct (4) is conical, the conical end of the cooling air duct (4) is inserted into the cavity of the rabbet clamping rollers (31), and a plurality of air outlets (41) are arranged on the side surface of the conical end of the cooling air duct (4); The conical shape of the cooling air duct (4) is opposite to the conical direction of the rabbet clamping rollers (31); The conical angle of the conical end of the cooling air duct (4) is 30 - 45°; The clamping angle of the rabbet clamping rollers (31) is 45 - 60°.

2. The edge plate clamping device for overflow method substrate glass forming according to claim 1, characterized in that, the cavity of the rabbet clamping rollers (31) is a conical structure with a uniform wall thickness.

3. The edge plate clamping device for overflow method substrate glass forming according to claim 1, characterized in that, the rabbet unit (3) is arranged outside the furnace body (5), and the rabbet clamping rollers (31) are installed on the rabbet shafts in the rabbet unit (3).

4. The edge plate clamping device for overflow method substrate glass forming according to claim 1, characterized in that, the rabbet clamping rollers (31) extend into the furnace body (5) through the rabbet shafts.

5. The edge plate clamping device for overflow method substrate glass forming according to claim 1, characterized in that, the rabbet clamping rollers (31) clamp the edge surface of the glass plate (2) through the side surface of the conical top.

6. A working method of the edge plate clamping device for overflow method substrate glass forming according to any one of claims 1 - 5, characterized in that, it includes the following steps: Cooling air (42) quickly enters the conical end of the cooling air duct (4) and is discharged from a plurality of air outlets (41) on the side surface of the conical end, directly blowing the side part of the inner cavity of the rabbet clamping rollers (31), that is, the glass clamping area. The rabbet clamping rollers (31) clamp the edge of the glass plate (2) and are quickly cooled. The high - heat glass plate (2) quickly transfers heat through the metal rabbet clamping rollers (31), and after heat exchange with the cooling air (42), the heat - exchanged return air (43) is discharged from the furnace body (5); While the rabbet clamping rollers (31) clamp and cool the glass plate (2), the side surface of the conical top of the rabbet clamping rollers (31) simultaneously applies an inward lateral force to the clamping area (A) of the glass plate (2), causing the glass in the clamping area (A) to slowly transition to the transition area (B).

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