CN115677185B - Tin bath for improving glass defects of Mini Led backboard - Google Patents

Tin bath for improving glass defects of Mini Led backboard Download PDF

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Publication number
CN115677185B
CN115677185B CN202211473017.XA CN202211473017A CN115677185B CN 115677185 B CN115677185 B CN 115677185B CN 202211473017 A CN202211473017 A CN 202211473017A CN 115677185 B CN115677185 B CN 115677185B
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tin bath
tin
glass
fixed base
rotating shaft
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CN115677185A (en
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刘建勇
姜杰
李凯良
裴海龙
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Qingdao Ronghe New Material Technology Co Ltd
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Qingdao Ronghe New Material Technology Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/50Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57Improving the yield, e-g- reduction of reject rates

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Abstract

The invention discloses a tin bath for improving defects of Mini Led backboard glass, and belongs to the technical field of tin baths for producing Mini Led backboard glass. The technical proposal is as follows: the device comprises a tin bath body, wherein the tin bath body is provided with a high-temperature zone, a medium-temperature zone and a low-temperature zone; a fixed base is respectively arranged in the medium temperature region and one end of the low temperature region, which is close to the outlet, a rotating shaft is arranged above the fixed base on the tin bath body, and the rotating shaft is driven to rotate by a motor; two guide plates are axially arranged at the upper part of the rotating shaft and are arranged in a V shape; each guide plate is composed of a row of guide rods, a thermocouple sensor is arranged at the top of each guide rod, and the motor and the thermocouple sensor are respectively and electrically connected with the control system. According to the invention, the fixed base and the guide plate play a role in retarding the backflow of the molten tin, so that the influence of the turbulence of the molten tin on the microwaviness of the glass is avoided; the transverse temperature difference of molten tin can be controlled by adjusting the angle of the guide plate, so that the quality of the lower surface of glass is improved.

Description

Tin bath for improving glass defects of Mini Led backboard
Technical Field
The invention relates to the technical field of tin baths for producing Mini Led backboard glass, in particular to a tin bath for improving defects of Mini Led backboard glass.
Background
In float glass production, the molten tin generates strong forward flow due to the traction of a glass ribbon, and simultaneously deep reflux and surface layer side reflux are caused due to large temperature difference, so that the molten tin flows rapidly at the outlet of the molten tin bath, the cold and hot molten tin in the middle section of the molten tin bath is complex in intersection condition and turbulent in flow, the molten tin with lower temperature in a low-temperature region flows back to a medium-temperature region easily, and even flows back to a high-temperature region, so that large transverse temperature difference is caused, and the establishment of longitudinal temperature gradient is unfavorable. Meanwhile, the defects of a large amount of tin pollution in the low-temperature area can flow back to the medium-temperature area and the high-temperature area, and various defects on and under the board are easily caused; in addition, the low Wen Xiye flows back to the middle temperature zone and the high temperature zone to be heated again, and a large amount of heat is consumed.
In order to solve the above problems, a graphite stopper is generally fixed on the solder bath floor tile to block the reflow soldering tin, but this method is not only passive and delayed, but also has unsatisfactory effect. Meanwhile, compared with the common float glass, the Mini Led electronic backboard glass has more strict requirements on the lower surface defect and microwaviness of the glass, so that a tin bath with better tin liquid backflow blocking effect is required.
Disclosure of Invention
The invention aims to solve the technical problems that: the defect of the prior art is overcome, and the tin bath for improving the defects of the Mini Led backboard glass is provided, on one hand, the effect of blocking the backflow of tin liquid can be achieved through the fixed base and the guide plate, the longitudinal convection is blocked, and the influence on the micro-wave texture of the glass due to the turbulence of the tin liquid is avoided; on the other hand, the angle of the guide plate can be adjusted to control the flow rate of the molten tin so as to reduce the transverse temperature difference of the glass ribbon and improve the quality of the lower surface of the glass.
The technical scheme of the invention is as follows:
the tin bath for improving the defects of the Mini Led backboard glass comprises a tin bath body, wherein the tin bath body is provided with a high-temperature area, a medium-temperature area and a low-temperature area; a fixed base is respectively arranged in the medium temperature region and one end of the low temperature region, which is close to the outlet, a rotating shaft is arranged above the fixed base on the tin bath body, and the rotating shaft is driven to rotate by a motor; two guide plates are axially arranged at the upper part of the rotating shaft and are arranged in a V shape; each guide plate is composed of a row of guide rods, a thermocouple sensor is arranged at the top of each guide rod, and the motor and the thermocouple sensor are respectively and electrically connected with the control system.
Preferably, the guide rod is provided with an electric heating resistance wire, and the electric heating resistance wire is electrically connected with the control system.
Preferably, an electromagnetic coil is arranged in the fixed base and is electrically connected with the control system.
Preferably, a plurality of flow rate sensors are arranged in the tin bath body, and the flow rate sensors are electrically connected with the control system.
Preferably, a cooling water pipe is further arranged in the fixed base.
Preferably, an output shaft of the motor is connected with the rotating shaft through a transmission mechanism.
Preferably, the guide rod is made of tungsten-copper alloy with graphite plated on the surface.
Compared with the prior art, the invention has the following beneficial effects:
1. on one hand, the tin bath provided by the invention has the effect of blocking the backflow of tin liquid through the fixed base and the guide plate, and can be used for blocking longitudinal convection and avoiding influencing the microwaviness of glass due to the turbulence of the tin liquid; on the other hand, the angle of the guide plate can be adjusted to control the flow rate of the molten tin so as to reduce the transverse temperature difference of the glass ribbon, avoid the occurrence of scratch defects on the lower surface of the glass caused by the temperature difference problem and improve the quality of the lower surface of the glass.
2. According to the invention, the electric heating resistance wires are arranged on the guide rods, so that tin liquid at different transverse positions can be heated in a targeted manner, the transverse temperature of the tin liquid is finally consistent, the viscosity of glass is finally consistent, and the performance of the lower surface of the glass is finally consistent, thereby achieving the purpose of controlling the defects of the lower surface of the glass.
3. The electromagnetic coil is arranged in the fixed base, so that various impurities such as oxides contained in the tin liquid can be induced to the surface, and the impurities are removed in a slag removing mode, so that the damage of the oxides to the lower surface of the glass is avoided; on the other hand, the flow speed of the molten tin in the tin bath can be controlled by changing the voltage applied to the electromagnetic coil.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a top view of the present invention.
Fig. 3 is a schematic structural view of the guide rod of the present invention.
Fig. 4 is a schematic view of the installation position of the electromagnetic coil of the present invention.
Fig. 5 is a schematic diagram of a connection mode of the rotating shaft and the motor according to the present invention.
In the figure, 1, a tin bath body; 101. a high temperature zone; 102. a medium temperature zone; 103. a low temperature zone; 4. a fixed base; 5. a rotating shaft; 6. a motor; 7. a deflector; 701. a guide rod; 8. a thermocouple sensor; 9. an electric thermal resistance wire; 10. an electromagnetic coil; 11. a cooling water pipe; 12. a transmission mechanism; 13. a flow rate sensor.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1
As shown in fig. 1-2, the present embodiment provides a tin bath for improving defects of Mini Led back plate glass, which includes a tin bath body 1, wherein the tin bath body 1 adopts a main body structure of an existing tin bath, and the tin bath body 1 is provided with a high temperature region 101, a medium temperature region 102 and a low temperature region 103. Fixed bases 4 are respectively arranged in the middle temperature area 102 and at one end of the low temperature area 103 close to the outlet, so as to play a role in preventing tin liquor in the low temperature area 103 from flowing back to the middle temperature area 102 and even the high temperature area 101 to a certain extent. The fixed base 4 is also provided with a cooling water pipe 11, and flowing cooling water is introduced into the cooling water pipe 11 for cooling tin liquid in the tin bath. A rotating shaft 5 is arranged above the fixed base 4 on the tin bath body 1, and the rotating shaft 5 is driven to rotate by a motor 6. As shown in fig. 5, the motor 6 may drive the rotating shaft 5 to rotate by adopting a transmission manner of the transmission mechanism 12, and the transmission mechanism 12 may adopt a connection manner of a gear and a chain, that is, an output shaft of the motor 6 is connected with the rotating shaft 5 through the gear and the chain, and the manner is in the prior art and will not be described herein. Two guide plates 7 are axially arranged at the upper part of the rotating shaft 5, and the two guide plates 7 are arranged in a V shape; as shown in fig. 3, each guide plate 7 is composed of a row of guide rods 701, a thermocouple sensor 8 is installed on the top of each guide rod 701, and the motor 6 and the thermocouple sensor 8 are respectively electrically connected with the control system. Wherein, the baffle 7 is made of materials which have excellent heat conduction performance, wear resistance and hardness and do not react with pure tin and molten glass, such as tungsten copper alloy with graphite plated on the surface, and the like.
Working principle:
after the molten tin flows into the low-temperature area 103 from the high-temperature area 101 to the middle-temperature area 102 and the low-temperature area 103 in the molten tin bath body 1, the molten tin can be effectively blocked due to the blocking of the fixed base 4 at the near-outlet of the middle-temperature area 102 and the low-temperature area 103 and the guide plate 7 above the fixed base, on one hand, the molten tin can be blocked from flowing back to the middle-temperature area 102 and the high-temperature area 101 at a lower temperature, the transverse temperature difference of the molten tin caused by the backflow is greatly improved, and the establishment of a longitudinal temperature gradient is also facilitated; on the other hand, defects on various boards and under boards caused by that the defects containing a large amount of tin pollution in the low-temperature area 103 flow back to the middle-temperature area 102 and the high-temperature area 101 are greatly reduced, and meanwhile, heat consumed by secondary heating of the low-Wen Xiye flow back middle-temperature area 102 and the high-temperature area 101 is also reduced; in addition, the molten tin reflowed in the low-temperature region 103 can be further mixed under the blocking action of the fixed base 4 and the guide plate 7, so that heat is fully conducted.
The thermocouple sensor 8 on the guide rod 701 detects the temperature of molten tin from the middle to the edge in the molten tin bath body 1 in real time, wherein the temperature in the middle of the glass plate is highest, and the temperature from the middle to the edge gradually decreases, namely, a temperature difference is generated. The maximum temperature value in the middle of the glass plate is taken as a reference temperature value, an allowable temperature difference high limit value is preset in the control system, and when the difference between the temperature measured by the rest thermocouple sensors 8 and the reference temperature value exceeds the high limit value, it is indicated that the transverse temperature difference of the molten tin is too large, and adjustment is needed, otherwise, the glass performance is affected. At this time, the control system starts the motor 6 to drive the rotating shaft 5 to rotate, so that the guide plate 7 above the fixed base 4 close to the inflow end of the molten tin rotates a certain angle in the standing direction, thereby increasing the resistance of the guide plate 7 to the inflow molten tin, reducing the inflow amount of the molten tin, reducing the flow speed of the molten tin, promoting the transverse flow of the molten tin when the molten tin is blocked, and reducing the transverse temperature difference. The rotation angle is kept for a period of time, the temperature difference change is monitored, if the temperature difference does not fall below the high limit value in the period of time, the guide plate 7 above the fixed base 4 close to the molten tin inflow end is continuously rotated for a certain angle in the rising direction until the temperature difference falls below the high limit value.
The device blocks strong molten tin reflux, so that the molten tin reflux is stable, the amount of molten tin with lower temperature in the low temperature area 103 flowing back to the middle temperature area 102 and the high temperature area 101 is reduced, the influence of molten tin turbulence on the microwaviness of glass is reduced, the establishment of the longitudinal gradient of a molten tin bath is ensured, and the flattening polishing effect of the glass in a flattening area and the thinning effect of the glass in a thinning area are ensured. In addition, a layer of immobilized layer is arranged in the molten tin, a large amount of tin oxide is accumulated in the immobilized layer, and when the width and the speed of the glass plate change, the immobilized layer fluctuates to cause a large amount of tin oxide to be released, so that the quality of the lower surface of the glass is seriously affected. The device can regularly and purposefully adjust the inclination angle of the guide plate 7, thereby artificially changing the convection of molten tin, and releasing the tin oxide in the motionless layer in time so as to ensure the quality of the lower surface of the glass.
Example 2
On the basis of embodiment 1, as shown in fig. 3, the flow guiding rod 701 is provided with an electric resistance wire 9, and the electric resistance wire 9 is electrically connected with the control system. After the transverse temperature difference of the molten tin is reduced to the allowable high limit value by adjusting the inclination angle of the guide plate 7, the control system electrifies the electric heating resistance wires 9 on certain guide rods 701 in a targeted manner according to the molten tin temperatures detected by the thermocouple sensors 8 at different temperature measuring points so as to heat the molten tin at the position, so that the molten tin temperatures at different transverse positions are consistent, and the uniformity of the whole transverse temperature of the glass plate is ensured. The viscosity of the glass is determined by the temperature, if the temperature is inconsistent, the viscosity of the glass is inconsistent everywhere, so that the lower surface performance of the glass is inconsistent, defects such as scratch and the like are easy to occur at an outlet, and defects such as warpage and the like caused by uneven stress are easy to occur. The transverse temperature difference of the molten tin is reduced to be lower than the high limit value by adjusting the inclination angle of the guide plate, and then the temperature of the molten tin at different transverse positions is adjusted pertinently through the electric heating resistance wire 9 of the embodiment, so that the transverse temperature of the molten tin is kept consistent, and finally the viscosity of glass is consistent and the performance of the lower surface is consistent, thereby achieving the purpose of controlling the defects of the lower surface of the glass.
Example 3
On the basis of the embodiment 2, as shown in fig. 4, a plurality of flow rate sensors 13 are installed in the tin bath body 1, and the flow rate sensors 13 can be arranged at different heights of the tin bath and at the bottom of the tin bath body 1; the fixed base 4 is internally provided with an electromagnetic coil 10, and the flow rate sensor 13 and the electromagnetic coil 10 are respectively and electrically connected with a control system.
The electromagnetic coil 10 generates an electromagnetic field by supplying current to the electromagnetic coil 10 through the control system, on one hand, various impurities such as oxides contained in the molten tin can be induced to the surface, and the impurities are removed through the modes such as slag skimming, so that the damage of the oxides to the lower surface of the glass is avoided. On the other hand, the electromagnetic field can generate resistance to the molten tin in the molten tin bath body 1, and when the voltages applied to the electromagnetic coil 10 are different, the resistance to the molten tin is different; therefore, a proper molten tin flow rate range can be preset in the control system, when the flow rate sensor 13 detects that the molten tin flow rate is too high, the voltage of the electromagnetic coil 10 can be increased, and the resistance to molten tin is increased, so that the molten tin flow rate is reduced, and the phenomenon that the glass swings due to too large molten tin turbulence is avoided; when the flow rate sensor 13 detects that the flow rate of the molten tin is too low, the voltage of the electromagnetic coil 10 can be reduced, and the resistance to the molten tin is reduced, so that the flow rate of the molten tin is increased, and the phenomenon that the electromagnetic coil cannot induce impurities such as oxides is avoided. The flow speed of the molten tin is flexibly adjusted by adjusting the electromagnetic field force generated by the electromagnetic coil 10.
Although the present invention has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention/be within the scope of the present invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (5)

1. The tin bath for improving the defects of the Mini Led backboard glass comprises a tin bath body (1), wherein the tin bath body (1) is provided with a high-temperature area (101), a medium-temperature area (102) and a low-temperature area (103); the device is characterized in that a fixed base (4) is respectively arranged in the medium temperature area (102) and at one end of the low temperature area (103) close to the outlet, a rotating shaft (5) is arranged above the fixed base (4) on the tin bath body (1), and the rotating shaft (5) is driven to rotate by a motor (6); two guide plates (7) are axially arranged at the upper part of the rotating shaft (5), and the two guide plates (7) are arranged in a V shape; each guide plate (7) is composed of a row of guide rods (701), a thermocouple sensor (8) is arranged at the top of each guide rod (701), and a motor (6) and the thermocouple sensor (8) are respectively and electrically connected with a control system; the flow guide rod (701) is provided with an electric thermal resistance wire (9), and the electric thermal resistance wire (9) is electrically connected with the control system; an electromagnetic coil (10) is arranged in the fixed base (4), and the electromagnetic coil (10) is electrically connected with the control system.
2. The tin bath for improving the glass defects of the Mini Led back plate according to claim 1, wherein a plurality of flow rate sensors (13) are arranged in the tin bath body (1), and the flow rate sensors (13) are electrically connected with a control system.
3. The tin bath for improving the defects of the Mini Led back plate glass according to claim 1, wherein a cooling water pipe (11) is further arranged in the fixed base (4).
4. The tin bath for improving the glass defects of the Mini Led back plate according to claim 1, wherein an output shaft of the motor (6) is connected with the rotating shaft (5) through a transmission mechanism (12).
5. The tin bath for improving the glass defects of the Mini Led back plate according to claim 1, wherein the guide rod (701) is made of tungsten copper alloy with graphite plated surface.
CN202211473017.XA 2022-11-23 2022-11-23 Tin bath for improving glass defects of Mini Led backboard Active CN115677185B (en)

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CN115677185B true CN115677185B (en) 2024-02-09

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2291122C1 (en) * 2005-05-26 2007-01-10 Открытое акционерное общество "Саратовский институт стекла" Method and device for control of gas flows of protective atmosphere in glass bath in production of float-glass
CN102583968A (en) * 2012-01-19 2012-07-18 河南国控宇飞电子玻璃有限公司 Skimming machine for producing ultra-thin glass
CN102923937A (en) * 2012-11-22 2013-02-13 中国建材国际工程集团有限公司 Tin liquor processing method for float glass and ultra-thin float glass
CN105776825A (en) * 2014-12-26 2016-07-20 吴江南玻玻璃有限公司 Float glass production equipment
CN206799422U (en) * 2017-06-08 2017-12-26 中国洛阳浮法玻璃集团有限责任公司 A kind of molten tin backflow guide device for float glass tin bath tail end
WO2018207162A1 (en) * 2017-05-12 2018-11-15 Saint-Gobain Glass France Improved method and installation for the production of flat glass by a float glass process
CN109455908A (en) * 2018-12-29 2019-03-12 长兴旗滨玻璃有限公司 Float glass tin bath, floatation glass production line and ultra-thin glass preparation process
CN212051115U (en) * 2020-05-11 2020-12-01 河南省安装集团有限责任公司 Float glass tin bath

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2291122C1 (en) * 2005-05-26 2007-01-10 Открытое акционерное общество "Саратовский институт стекла" Method and device for control of gas flows of protective atmosphere in glass bath in production of float-glass
CN102583968A (en) * 2012-01-19 2012-07-18 河南国控宇飞电子玻璃有限公司 Skimming machine for producing ultra-thin glass
CN102923937A (en) * 2012-11-22 2013-02-13 中国建材国际工程集团有限公司 Tin liquor processing method for float glass and ultra-thin float glass
CN105776825A (en) * 2014-12-26 2016-07-20 吴江南玻玻璃有限公司 Float glass production equipment
WO2018207162A1 (en) * 2017-05-12 2018-11-15 Saint-Gobain Glass France Improved method and installation for the production of flat glass by a float glass process
CN206799422U (en) * 2017-06-08 2017-12-26 中国洛阳浮法玻璃集团有限责任公司 A kind of molten tin backflow guide device for float glass tin bath tail end
CN109455908A (en) * 2018-12-29 2019-03-12 长兴旗滨玻璃有限公司 Float glass tin bath, floatation glass production line and ultra-thin glass preparation process
CN212051115U (en) * 2020-05-11 2020-12-01 河南省安装集团有限责任公司 Float glass tin bath

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