CN111646676A - Substrate glass forming temperature field control device and method - Google Patents
Substrate glass forming temperature field control device and method Download PDFInfo
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- CN111646676A CN111646676A CN202010621621.7A CN202010621621A CN111646676A CN 111646676 A CN111646676 A CN 111646676A CN 202010621621 A CN202010621621 A CN 202010621621A CN 111646676 A CN111646676 A CN 111646676A
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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
- C03B17/067—Forming glass sheets combined with thermal conditioning of the sheets
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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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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/30—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature
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Abstract
The invention provides a substrate glass forming temperature field control device and a method, comprising a plurality of temperature layers formed in a forming furnace, wherein each temperature layer is internally provided with a heating unit and a cooling device; the heating unit is symmetrically arranged on a frame on the side wall of the forming furnace by taking the substrate glass in the forming furnace as a symmetrical plane, and comprises a plurality of heating devices which are sequentially arranged from the top to the bottom of the forming furnace; the heating device comprises a heat insulation block, and the heat insulation block is connected with the side wall frame of the forming furnace in a sliding manner; the cooling device is symmetrically arranged in the forming furnace by taking the substrate glass in the forming furnace as a symmetrical plane and is positioned between the heating unit and the substrate glass; the cooling device comprises a water outlet pipe and a heat-insulating ring; the water outlet pipe is arranged along the top to the bottom of the forming furnace in a penetrating way, and the pipe wall of the water outlet pipe is fixedly sleeved with the heat preservation and insulation ring.
Description
Technical Field
The invention relates to a substrate glass manufacturing device, belongs to the field of special equipment, and particularly relates to a substrate glass forming temperature field control device and a substrate glass forming temperature field control method.
Background
Substrate glass used in the field of manufacturing flat panel displays such as common TFT-LCD thin film transistor displays, PDP plasma display screens and the like is produced by adopting an overflow down-draw mode. In the overflow process of producing substrate glass, the forming furnace is used for meeting the requirement of the temperature field of the softening point of glass, and an adjustable temperature field required by cooling forming, thickness adjustment and stress strain of a glass plate is provided in the area. When molten glass enters the forming area through the overflow device, the lower edge part is rapidly cooled under the action of the edge roller, and the forming width of the substrate glass is ensured. And then, in a forming stage, the temperature of the glass plate is rapidly and stably reduced in the area according to the viscosity-temperature curve of the glass characteristic, and the constant temperature field in the equipment is ensured, so that the consistency of the surface tension and the stress of the glass in the cooling process can be ensured, and the surface stress and the warping are minimized. Typically the surface flatness of the substrate glass must be within about 100um and 190um, and any warp or fluctuation will negatively impact the quality of the display.
With the continuous development of liquid crystal display technology, G8.5 and higher generation substrate glass will become mainstream, and the product thickness also has 0.7mm and gradually develops to 0.4 or even thinner glass, the corresponding requirements on the surface quality of glass, such as stress and warpage, are higher and higher, the production according to the original process standard cannot meet higher and higher customer requirements, and the production difficulty is higher and higher. Meanwhile, the control requirement on the temperature field of the forming equipment is higher and higher, and refined and precise temperature field control is the development trend and the target of the forming equipment.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a device and a method for controlling a substrate glass forming temperature field, which have the advantages of simple structure and convenient operation, and improve the problem that the flatness of the substrate glass is influenced by a fixed heating mode which cannot be adjusted according to the actual temperature condition of the substrate glass in the existing forming furnace.
The invention is realized by the following technical scheme:
a substrate glass forming temperature field control device comprises a plurality of temperature layers formed in a forming furnace, wherein a heating unit and a cooling device are arranged in each temperature layer;
the heating unit is symmetrically arranged on a frame on the side wall of the forming furnace by taking the substrate glass in the forming furnace as a symmetrical plane, and comprises a plurality of heating devices which are sequentially arranged from the top to the bottom of the forming furnace;
the heating device comprises a heat insulation block, and the heat insulation block is in sliding connection with the side wall frame of the forming furnace;
the cooling device is symmetrically arranged in the forming furnace by taking the substrate glass in the forming furnace as a symmetrical plane and is positioned between the heating unit and the substrate glass;
the cooling device comprises a water outlet pipe and a heat preservation and insulation ring; the water outlet pipe is arranged along the top to the bottom of the forming furnace in a penetrating way, and the pipe wall of the water outlet pipe is fixedly sleeved with a heat preservation and insulation ring.
Preferably, a push rod is fixedly arranged on the outer side of the heat preservation block and used for adjusting the displacement of the heat preservation block.
Preferably, the upper end and the lower end of the heat preservation block are respectively provided with a groove, and pulleys arranged on the frame on the side wall of the forming furnace and the grooves at the upper end and the lower end of the heat preservation block are embedded.
Preferably, the heating device further comprises a heating wire, the connecting end of the heating wire is respectively connected with the two ends of the heat-insulating block, and the heating section is spiral.
Preferably, a water inlet pipe is inserted into the pipe cavity of the water outlet pipe, a water outlet is formed in the upper portion of the water outlet pipe, and the water inlet pipe forms a circulating cavity in the pipe cavity of the water outlet pipe.
Preferably, the heat preservation and insulation ring is made of aluminum silicate.
Preferably, each temperature layer in the forming furnace is provided with a temperature monitoring device, and the temperature monitoring device comprises a temperature acquisition system, a signal processor and a display;
the temperature acquisition system is arranged on the heat insulation block in the temperature area;
the output end of the temperature acquisition system is connected with the signal processor; the output end of the signal processor is connected with the input end of the display.
Preferably, the device also comprises a soaking plate arranged on the inner side of the temperature layers, wherein the soaking plate is fixedly connected to the bottom of the forming furnace from the top of the forming furnace, is symmetrically arranged by taking the substrate glass in the forming furnace as a symmetrical plane and is positioned between the substrate glass and the cooling device.
The method for controlling the forming temperature field of the substrate glass comprises the following steps,
step 1: the substrate glass enters a forming furnace and sequentially passes through each temperature layer;
step 2: according to the requirement of the substrate glass on the inner side of each temperature layer on the temperature, the temperature layers are controlled:
when the substrate glass on the inner side of the temperature layer needs to be heated, the substrate glass is heated through the corresponding temperature layer, the heat preservation blocks are moved at a constant speed, the heat preservation blocks on the two sides of the heating temperature layer respectively move in the direction close to the substrate glass, and meanwhile, the water outlet pipe is replaced, so that the heat preservation and heat insulation ring on the water outlet pipe corresponds to the heating temperature layer in heating;
when the substrate glass on the inner side of the temperature layer needs to be cooled, the substrate glass is cooled through the corresponding temperature layer, and the heat insulation blocks are moved at a constant speed, so that the heat insulation blocks in the cooling temperature layer move along the direction far away from the substrate glass respectively.
Preferably, the plurality of temperature layers formed in the forming furnace are divided into a plurality of temperature layer regions for adjusting the temperature of the substrate glass in each temperature layer region; the temperature layer region includes at least one temperature layer.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the substrate glass forming temperature field control device, the heating device is moved on the forming furnace fixing frame, the distance between the heating device and the substrate glass is adjusted, the influence of substrate glass warping is reduced, the heat preservation and insulation ring effectively protects the water outlet pipe, the water outlet pipe is prevented from being damaged due to overhigh temperature after the heating device approaches, meanwhile, the heating efficiency is increased, and temperature instability caused by cooling of the water outlet pipe is reduced.
Furthermore, the push rod is fixedly arranged on the outer side of the heat-insulating block, so that the distance between the heat-insulating block and the substrate glass can be conveniently adjusted, and the influence of the warping of the substrate glass is reduced.
Further, the pulleys arranged on the side wall frame of the forming furnace are embedded in the grooves at the end parts of the heat preservation blocks, so that the distance between adjacent heating devices is reduced, the temperature loss caused by the gaps between the adjacent heating devices is avoided, and the heat preservation effect in the forming furnace is improved.
Furthermore, heating device still includes the heater strip, and the heater strip link is connected with the both ends of heat preservation piece respectively, and the heating section is the heliciform, and the temperature of effective transmission temperature piece has improved the intensification efficiency in the forming furnace.
Furthermore, the water inlet pipe is inserted into the pipe cavity of the water outlet pipe, the water outlet is formed in the upper portion of the water outlet pipe, the water inlet pipe forms a circulating cavity in the pipe cavity of the water outlet pipe, the cooling time of cooling water in the pipe is prolonged, and the cooling effect of the cooling pipe is improved.
Furthermore, the heat-insulating ring is made of aluminum silicate, so that the heat transfer of the heat-insulating block to the substrate glass is accelerated, and the protection of the water outlet pipe is improved.
Furthermore, the temperature monitoring device effectively provides temperature signals of all areas in the forming furnace, and the temperature field is convenient to control.
Furthermore, the soaking plate in the forming furnace accelerates the diffusion of the temperature on the heat-insulating block, and improves the heating efficiency.
According to the method for controlling the temperature field for forming the substrate glass, the flexibility of temperature control is improved by moving the heat-insulating block, the warping phenomenon of the substrate glass is reduced, different cooling devices are replaced according to different temperature conditions of different temperature areas, the heat-insulating ring in the cooling device prevents a water outlet pipe from being damaged due to overhigh temperature after a heating device approaches, and meanwhile, the heating efficiency is increased.
Furthermore, a plurality of temperature layers formed in the forming furnace are divided into a plurality of temperature layer areas and used for adjusting the temperature of the substrate glass in each temperature layer area; the temperature layer region at least comprises one temperature layer, so that the required temperature of the substrate glass can be flexibly adjusted conveniently, the substrate glass is uniformly heated in each temperature layer, and the flatness of the substrate glass is improved.
Drawings
FIG. 1 is a schematic view of the inner structure of the temperature layer of the forming furnace of the present invention;
FIG. 2 is a schematic view of the cooling apparatus according to the present invention;
FIG. 3 is a schematic view of the sliding movement of the heating device according to the present invention;
FIG. 4 is a schematic diagram of the process application architecture of the present invention;
FIG. 5 is a schematic view of a cooling apparatus in a process application configuration according to the present invention;
FIG. 6 is a schematic diagram of a structure in which a temperature layer A, C is heated in a region B and the temperature of the temperature layer is reduced in a region B in the process application structure of the present invention;
FIG. 7 is a schematic diagram of a single temperature adjustment in temperature layer A, B, C region of a process application structure according to the present invention.
In the figure: 1 is an overflow device; 2 is substrate glass; 3, a clamping mechanism of the edge roller; 4 is a soaking plate; 5 is a heating device; 6 is a cooling device; 7 is a push rod; 8 is a pulley; 51 is a heating wire; 52 is a heat preservation block; 61 is a water inlet pipe; 62 is a water outlet pipe; 63 is a water outlet; 64 is a heat preservation and insulation ring; 65 is a circulation cavity.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention relates to a substrate glass forming temperature field control device, which comprises a plurality of temperature layers formed in a forming furnace, wherein each temperature layer is internally provided with a heating unit and a cooling device 6, as shown in figure 1; the heating unit is symmetrically arranged on a frame on the side wall of the forming furnace by taking the substrate glass 2 in the forming furnace as a symmetrical plane, and comprises a plurality of heating devices 5, and the plurality of heating devices 5 are sequentially arranged from the top to the bottom of the forming furnace; the heating device 5 comprises a heat insulation block 52 and a heating wire 51, grooves are respectively arranged at the upper end and the lower end of the heat insulation block 52, the heat insulation blocks 52 which are adjacent up and down are in sliding connection with pulleys 8 arranged on a side wall frame of the forming furnace, wherein the pulleys 8 are embedded in the grooves at the end parts of the heat insulation blocks 52; as shown in fig. 3, the connecting ends of the heating wire 51 are respectively connected with the two ends of the heat insulation block 52, and the heating section is spiral;
the soaking plate 4 isolates the heating device 5 and the cooling device 6 from the substrate glass 2, and ensures that the substrate glass 2 is in a uniform temperature field in the heating or cooling process; the soaking plates 4 are connected to the bottom of the forming furnace from the top of the forming furnace, symmetrically arranged at two sides of the substrate glass 2 and positioned between the substrate glass 2 and the cooling device 6
As shown in fig. 2, the cooling device 6 is disposed in the forming furnace symmetrically with respect to the substrate glass 2 in the forming furnace, and is located between the heating unit and the substrate glass 2; the cooling device 6 comprises a water outlet pipe 62 and a heat preservation and insulation ring 64; the outlet pipe 62 runs through the setting along forming furnace top to bottom, and fixed cover establishes heat preservation heat insulating ring 64 on the pipe wall of outlet pipe 62, and the intracavity of outlet pipe 62 is inserted and is set up inlet tube 61, and outlet pipe 62 upper portion is equipped with delivery port 63, inlet tube 61 forms circulation cavity 65 in the intracavity of outlet pipe 62, and certain heat is taken away to the directional circulation of cooling water according to the arrow and is flowed out by delivery port 63, plays the purpose of cooling.
The method for controlling the forming temperature field of the substrate glass comprises the following steps:
step 1: the substrate glass 2 enters a forming furnace and sequentially passes through each temperature layer;
step 2: the temperature layer control is performed according to the temperature requirement of the substrate glass 2 at the inner side of each temperature layer:
when the substrate glass 2 on the inner side of the temperature layer needs to be heated, the corresponding temperature layer is used for heating, the heat preservation blocks 52 are moved at a constant speed, so that the heat preservation blocks 52 on the two sides of the heating temperature layer respectively move in the direction close to the substrate glass 2, and meanwhile, the water outlet pipe 62 is replaced, so that the heat preservation and heat insulation ring 64 on the water outlet pipe 62 corresponds to the heating temperature layer in heating;
when the substrate glass 2 on the inner side of the temperature layer needs to be cooled, the substrate glass is cooled through the corresponding temperature layer, and the heat insulation blocks 52 are moved at a constant speed, so that the heat insulation blocks 52 in the cooling temperature layer respectively move in the direction away from the substrate glass 2;
a plurality of temperature layers formed in the forming furnace are divided into a plurality of temperature layer areas and used for adjusting the temperature of the substrate glass 2 in each temperature layer area; the temperature layer region includes at least one temperature layer.
As shown in fig. 4 and 5, the plurality of temperature layers formed in the forming furnace are divided into a temperature layer a region, a temperature layer B region, and a temperature layer C region, wherein the temperature layer a region includes the uppermost temperature layer; the temperature layer C area comprises a lowest temperature layer; the temperature layer B area comprises an intermediate temperature layer;
at least one layer of heating device is arranged in the temperature layer;
when a single-layer heating device is arranged in each temperature layer, the temperature of each temperature layer can be adjusted at the same time;
when a plurality of layers of heating devices are arranged in the temperature layer, the temperature of the same layer can be independently adjusted in the temperature layer
When the substrate glass 2 flows down, the power of the heating device 5 is adjusted according to different temperature areas, and the cooling device 6 is matched for cooling, so that the temperature of the substrate glass 2 is consistent along the overflow direction, and the warping deformation of the glass plate is minimized.
Examples
The molten substrate glass 2 uniformly overflows from the two sides of the overflow device 1 and flows downwards, and the lower edge part is clamped by the clamping mechanism 3 of the edge roller under the action of gravity to be rapidly cooled and enters the forming furnace; according to the reference temperature value of the substrate glass 2 in the forming furnace, a plurality of temperature layers formed in the forming furnace are divided into a temperature layer A area, a temperature layer B area and a temperature layer C area, and the temperature change in the substrate glass 2 in each area is monitored through a temperature monitoring device;
the display in the temperature layer receives that the temperature signal in the temperature acquisition system is lower than the reference temperature value of the substrate glass 2, the substrate glass 2 on the inner side of the temperature layer needs to be heated, the temperature layer is heated, the push rod 7 of the heat preservation block 52 is pushed at a constant speed, the heat preservation blocks 52 of the temperature layer move respectively in the direction close to the substrate glass 2, and meanwhile, the water pipe 62 is replaced, so that the heat preservation heat insulation ring 64 on the water outlet pipe 62 corresponds to the temperature layer in heating, and damage to the water outlet pipe 62 due to overhigh temperature is avoided after the heat preservation block 52 is close to the water outlet pipe 62;
the display in the temperature layer receives the temperature signal in the temperature acquisition system and is higher than the reference temperature value of the substrate glass 2, so that the substrate glass 2 at the inner side of the temperature layer needs to be cooled, the temperature layer is cooled, and the push rod 7 is pulled at a constant speed to enable the heat insulation blocks 52 in the cooling temperature layer to move along the direction far away from the substrate glass 2 respectively.
In actual production, the temperature layer a and the temperature layer C are often heated and the temperature layer B is often cooled, as shown in fig. 6, the temperature layer a and the temperature layer C are heated, the push rod 7 is pushed at a constant speed in the temperature layer a and the temperature layer C to respectively move the heat preservation blocks 52 in the heating medium temperature layer in the direction close to the substrate glass 2, and the water pipe 62 is replaced at the same time, so that the heat preservation and insulation ring 64 on the water outlet pipe 62 corresponds to the heating medium temperature layer; and cooling the temperature zone of the temperature layer B, and pulling the push rod 7 in the temperature layer B at a constant speed to enable the heat preservation blocks 52 in the cooling temperature layer to move along the direction far away from the substrate glass 2 respectively.
If a multilayer heating device is arranged in the temperature layer B, the temperature of the same layer can be independently adjusted in the temperature layer, as shown in fig. 7, the temperature layer B is locally heated, the push rod 7 is pushed at a constant speed to enable the heat preservation blocks 52 in the local area in the temperature layer B to respectively move in the direction close to the substrate glass 2, and meanwhile, the water pipe 62 is replaced, so that the heat preservation and insulation ring 64 on the water outlet pipe 62 corresponds to the temperature layer in the local area; cooling the temperature layer in the local area, and pulling the push rod 7 at a constant speed to enable the heat preservation blocks 52 in the local area of the temperature layer B to respectively move in the direction far away from the substrate glass 2.
In the invention, the heat-insulating ring 64 is made of aluminum silicate; the temperature signal is monitored by a temperature monitoring device, and the temperature monitoring device comprises a temperature acquisition system, a signal processor and a display; the temperature acquisition system is arranged on the heat insulation block 52 in the temperature layer; the output end of the temperature acquisition system is connected with the signal processor; the output end of the temperature acquisition system is connected with the signal processor; the temperature signal of each temperature zone in the forming furnace is received to the staff of being convenient for, carries out manual control to the temperature in the forming furnace and guarantees base plate glass 2, at an even temperature layer, makes the glass of melting state at the uniform velocity cooling and cooling of the in-process that becomes elasticity by viscidity, keeps even thickness and roughness.
Claims (10)
1. A substrate glass forming temperature field control device is characterized by comprising a plurality of temperature layers formed in a forming furnace, wherein each temperature layer is internally provided with a heating unit and a cooling device (6);
the heating unit is symmetrically arranged on a frame on the side wall of the forming furnace by taking the substrate glass (2) in the forming furnace as a symmetrical plane, and comprises a plurality of heating devices (5), and the plurality of heating devices (5) are sequentially arranged from the top to the bottom of the forming furnace;
the heating device (5) comprises a heat insulation block (52), and the heat insulation block (52) is in sliding connection with the side wall frame of the forming furnace;
the cooling device (6) is symmetrically arranged in the forming furnace by taking the substrate glass (2) in the forming furnace as a symmetrical plane and is positioned between the heating unit and the substrate glass (2);
the cooling device (6) comprises a water outlet pipe (62) and a heat preservation and insulation ring (64); the water outlet pipe (62) penetrates from the top to the bottom of the forming furnace, and a heat preservation and insulation ring (64) is fixedly sleeved on the pipe wall of the water outlet pipe (62).
2. The substrate glass forming temperature field control device according to claim 1, wherein a push rod (7) is fixedly arranged on the outer side of the heat insulation block (52) and used for adjusting the displacement of the heat insulation block (52).
3. The apparatus for controlling a forming temperature field of a glass substrate according to claim 1, wherein the upper and lower ends of the heat insulating block (52) are respectively provided with a groove, and the pulleys (8) provided on the frame of the side wall of the forming furnace are embedded in the grooves at the upper and lower ends of the heat insulating block (52).
4. The substrate glass forming temperature field control device according to claim 1, wherein the heating device (5) further comprises a heating wire (51), the connecting ends of the heating wire (51) are respectively connected with the two ends of the heat insulation block (52), and the heating section is in a spiral shape.
5. The substrate glass forming temperature field control device according to claim 1, wherein a water inlet pipe (61) is inserted into the cavity of the water outlet pipe (62), a water outlet (63) is arranged at the upper part of the water outlet pipe (62), and the water inlet pipe (61) forms a circulating cavity (65) in the cavity of the water outlet pipe (62).
6. The substrate glass forming temperature field control device of claim 1, wherein the thermal insulating ring (64) is made of aluminum silicate.
7. The substrate glass forming temperature field control device according to claim 1, wherein a temperature monitoring device is arranged in each temperature layer in the forming furnace, and the temperature monitoring device comprises a temperature acquisition system, a signal processor and a display;
the temperature acquisition system is arranged on a heat insulation block (52) in the temperature area;
the output end of the temperature acquisition system is connected with the signal processor; the output end of the signal processor is connected with the input end of the display.
8. The substrate glass forming temperature field control device according to claim 1, further comprising a soaking plate (4) disposed inside the plurality of temperature layers, wherein the soaking plate (4) is fixedly connected to the bottom of the forming furnace from the top of the forming furnace, is symmetrically disposed with respect to the substrate glass (2) in the forming furnace, and is located between the substrate glass (2) and the cooling device (6).
9. A substrate glass forming temperature field control method, characterized in that the apparatus according to any one of claims 1 to 7 comprises the steps of;
step 1: the substrate glass (2) enters a forming furnace and sequentially passes through each temperature layer;
step 2: according to the temperature requirement of the substrate glass (2) at the inner side of each temperature layer, the temperature layer is controlled:
when the substrate glass (2) on the inner side of the temperature layer needs to be heated, the corresponding temperature layer is used for heating, the heat preservation blocks (52) are moved at a constant speed, so that the heat preservation blocks (52) on the two sides of the heating temperature layer respectively move in the direction close to the substrate glass (2), and meanwhile, the water outlet pipe (62) is replaced, so that the heat preservation and insulation ring (64) on the water outlet pipe (62) corresponds to the heating temperature layer in heating;
when the substrate glass (2) on the inner side of the temperature layer needs to be cooled, the substrate glass is cooled through the corresponding temperature layer, and the heat insulation blocks (52) are moved at a constant speed, so that the heat insulation blocks (52) in the cooling temperature layer move along the direction far away from the substrate glass (2) respectively.
10. The substrate glass forming temperature field control method according to claim 9, wherein the plurality of temperature layers formed in the forming furnace are divided into a plurality of temperature layer regions for temperature adjustment of the substrate glass (2) in each temperature layer region; the temperature layer region includes at least one temperature layer.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113321407A (en) * | 2021-05-31 | 2021-08-31 | 彩虹（合肥）液晶玻璃有限公司 | Device and method for controlling shape of glass substrate |
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| CN111646676B (en) | 2023-09-22 |
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