CN210528776U - Heating device for glass tempering - Google Patents
Heating device for glass tempering Download PDFInfo
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- CN210528776U CN210528776U CN201921445158.4U CN201921445158U CN210528776U CN 210528776 U CN210528776 U CN 210528776U CN 201921445158 U CN201921445158 U CN 201921445158U CN 210528776 U CN210528776 U CN 210528776U
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Abstract
The utility model discloses a heating device for glass tempering, which comprises a roller furnace and an air flotation furnace; the roller furnace is arranged adjacent to the front and the back of the air floatation furnace, and the outlet of the roller furnace is connected with the inlet of the air floatation furnace; an air floating platform is arranged in the air floating furnace, the air floating platform is respectively provided with a group of straight spray holes and inclined spray holes, the straight spray holes are vertically upward, and the inclined spray holes are inclined upward towards the advancing direction of the glass; the inclined jet holes comprise two rows, the two rows of inclined jet holes are symmetrically distributed on two sides of the transverse central line of the air bearing table, and the distance between the two rows of inclined jet holes is smaller than the width of the glass plate to be heated; the straight spray holes and the inclined spray holes form a rectangular array together; the air floating platform with the combination of the straight spray holes and the inclined spray holes is adopted, air flow provided by the straight spray holes is used for supporting glass to suspend and heat, air flow provided by the inclined spray holes is mainly used for driving the glass to move forward, so that the glass plate is not contacted with any mechanical driving device in the heating and conveying processes of the air floating furnace, and the surface quality and the side quality of the glass are guaranteed.
Description
Technical Field
The utility model relates to a glass tempering equipment technical field specifically is a heating device for glass tempering.
Background
The method for manufacturing the toughened glass comprises the following steps: firstly, heating the glass in a heating furnace to a certain temperature (tapping temperature), then quickly tapping the high-temperature glass (tapping speed), and quenching in a quenching chamber.
The heating furnace is usually a roller bed furnace or an air flotation furnace. The heating furnace is internally provided with the roller way, the heating wires are arranged above and below the roller way, and the glass is conveyed and heated on the roller way.
The air floating furnace is internally provided with an air floating platform which is provided with vertically upward spray holes, hot air is sprayed out from the spray holes to form an air cushion layer between glass and the air floating platform, and the glass is conveyed and heated on the air cushion layer.
The tapping temperature and the tapping speed are important indexes for judging whether the heating furnace meets the requirements, the tapping temperature refers to the temperature required by tempering glass, and is usually close to or exceeds the softening temperature, the tapping speed refers to the speed of high-temperature glass which is tapped into a quenching chamber at a higher speed, because the glass is in a state close to or exceeding softening, it must be moved at a relatively high speed to avoid sagging deformation, furthermore, the tempering stress of the glass is related to the quenching strength, the higher the tempering stress, the higher the temperature of the glass, the higher the speed of entering the cooling medium (quenching chamber), the higher the quenching strength, the higher the tempering stress, therefore, no matter which heating device is used, the indexes of the tapping temperature and the tapping speed are met, the tapping temperature is usually 580-640 ℃, and the tapping speed is usually 0.6-1.1 m/s.
At the present stage, the roller furnace and the air floatation furnace both adopt a mechanical device to contact with the glass to drive the glass, when the high-temperature glass is discharged, the discharging speed must be realized by the acceleration of the driving device, at the moment, the damage of the driving device to the glass at the contact part is aggravated, the discharging speed and the discharging temperature are further improved, and the improvement of the tempering strength is directly limited.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a heating device for glass tempering, the device can reduce the harm that glass surface and side portion quality received in heating and transportation process.
The utility model provides a technical scheme that its technical problem adopted is:
a heating device for glass tempering comprises a roller furnace and an air floatation furnace, wherein the roller furnace and the air floatation furnace are arranged adjacently in front and at the back, and an outlet of the roller furnace is connected with an inlet of the air floatation furnace; an air floating platform is arranged in the air floating furnace, the air floating platform is respectively provided with a group of straight spray holes and inclined spray holes, the straight spray holes are vertically upward, and the inclined spray holes are inclined upward towards the advancing direction of the glass; the inclined jet holes comprise two rows, the two rows of inclined jet holes are symmetrically distributed on two sides of the transverse central line of the air bearing table, and the distance between the two rows of inclined jet holes is smaller than the width of the glass plate to be heated; the straight spray holes and the inclined spray holes form a rectangular array together.
Further, the included angle between the inclined spray holes and the horizontal plane is 80-89 degrees.
Further, the diameter of the inclined jet hole is the same as that of the straight jet hole.
The beneficial effects of the utility model are that, adopt the air supporting platform that straight orifice and oblique orifice combined together, the air current that the direct injection hole provided is used for supporting glass suspension and heating, the air current mainly used drive glass that the oblique injection hole provided gos forward, make glass not contact with any mechanical drive device at the in-process that the air supporting stove heated and carried, glass's surface quality and side quality obtain the guarantee, on this basis, glass's the speed of coming out of the stove and the temperature of coming out of the stove have been improved simultaneously to further improve glass's tempering intensity.
Drawings
The invention will be further described with reference to the following figures and examples:
fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is an enlarged schematic view of the straight nozzle of the present invention;
fig. 3 is an enlarged schematic view of the inclined nozzle of the present invention;
FIG. 4 is a schematic diagram of the distribution of straight spray holes and inclined spray holes according to the present invention;
fig. 5 is a schematic view of the glass sheet on the air bearing table during use of the present invention.
Detailed Description
Referring to fig. 1 to 3, the utility model provides a heating device for glass tempering, which comprises a roller bed furnace 1 and an air flotation furnace 2, wherein the roller bed furnace 1 and the air flotation furnace 2 are adjacently arranged in front and at the back, and the outlet of the roller bed furnace 1 is connected with the inlet of the air flotation furnace 2; be equipped with air supporting platform 3 in the air supporting stove 2, air supporting platform 3 is equipped with a set of straight orifice 4 and oblique jet orifice 5 respectively, and direct jet orifice 4 is vertical upwards, and oblique jet orifice 5 upwards inclines towards the glass advancing direction. Preferably, the included angle theta between the inclined spray holes 5 and the horizontal plane is 80-89 degrees. The diameter of the inclined jet hole is the same as that of the straight jet hole.
Referring to fig. 4 and 5, the inclined jet holes 5 include two rows, the two rows of inclined jet holes are symmetrically distributed on two sides of the transverse center line of the air bearing table 3, and the distance between the two rows of inclined jet holes is smaller than the width of the glass plate 6 to be heated; the straight orifices 4 and the inclined orifices 5 together form a rectangular array.
Taking the production of 800X 700mm glass plates as an example, the temperature required for tempering is 620 ℃.
Assuming that the glass sheet has a mass M, the acceleration of gravity g =9.8M/s2The included angle theta of the horizontal plane of the inclined spraying holes is 87 degrees, the glass plate is in a suspension state, the resultant force applied to the glass plate in the vertical direction is zero, the glass plate moves forward under the pushing of the inclined airflow of the inclined spraying holes 5 and makes accelerated motion in the horizontal direction, and the accelerated speed is a;
the inclined jet holes and the straight jet holes have the same aperture and the same air supply source, so that the airflow thrust ejected from each jet hole is the same, and the airflow thrust is set to be f;
in this embodiment, a 800 × 700mm glass plate is covered with 39 (rows) X40 (columns) of spray holes, wherein the 39 rows include 37 rows of direct spray holes 4 and 2 rows of oblique spray holes 5, and the travel distance of the glass in the air flotation furnace is 20 m.
The glass sheet is then subjected to a thrust in the vertical direction in the direction of the hot gas flow:
Fy= 40*（37* f+2* fsin87º） （1）；
the thrust of the glass in the horizontal direction before the hot gas flows is as follows:
Fx=40 *2*fcos87º （2）；
the glass sheet is subjected to a downward force of gravity in the vertical direction: mg;
the conditions for keeping the glass in suspension are: 40 (37 × f +2 × fsin 87) = Mg (3);
the conditions for advancing the glass in the horizontal direction were: 40 × 2 × fcos87= Ma (4);
solving equations (3) and (4) to obtain the acceleration a =0.026m/s2。
Suppose that the glass plate 6 is at v0Entering the air floatation furnace 2 at the speed of =0.2m/S, and substituting a =0.026 and the running distance S =20m into the formula S = v0t+(1/2)at2The solution yields a time t =32s, i.e. the running time of the glass sheet in the air flotation furnace 2 is 32 seconds.
Let t =32s, v0Substitution of =0.2m/s into the formula v = v0+ at, solved to v =1.03m/s, i.e. the output of the glassThe furnace speed was 1.03 m/s.
And setting the temperature rise rate of the photovoltaic glass in the air floatation furnace 2 to be 6 ℃/s (taking the temperature rise rate of the 2.5mm glass in the roller heating furnace to be 5-7 ℃/s as reference), raising the temperature of the glass plate in the air floatation furnace by 192 ℃, and keeping 428 ℃ lower than 620 ℃.
In actual production, the glass plate is heated to 428 ℃ in the roller furnace 1 and then is heated to v0The gas is fed into the air floatation furnace 2 at the speed of =0.2m/s, and the gas entering the gas supply chamber 7 is heated and then is ejected out of a rectangular array formed by a direct injection hole 4 and an inclined injection hole 5; the glass plate is suspended and heated by airflow sprayed from the straight spray holes 4, the glass plate is pushed to advance by airflow sprayed from the inclined spray holes 5, the glass plate is suspended and advanced for 32 seconds, the final temperature reaches 620 ℃, the speed reaches 1.03m/s, and the glass plate is discharged from the furnace, which completely meets the technical indexes of the discharging temperature and the discharging speed of the heating device.
The glass is heated to 428 ℃ in the roller furnace 1, the temperature is far lower than the softening point of the glass, the hardness of the glass is high, and the roller 8 cannot damage the surface quality of the glass.
Taking the production of 1605X 840mm glass plate as an example, the temperature required for tempering is 620 ℃.
In this embodiment, a 1605 × 840mm glass plate is covered with 47 (rows) X80 (columns) of spray holes, wherein the 47 rows include 45 rows of direct spray holes 4 and 2 rows of oblique spray holes 5, and the travel distance of the glass in the air flotation furnace is 20 m.
The conditions for keeping the glass sheet in a suspended state were:
80*（45* f+2* fsin87º）=Mg； （5）
the conditions for advancing the glass sheet in the horizontal direction were: 80 × 2 × fcos87 ° o = Ma (6)
Equations (5) and (6) are solved to obtain the acceleration a =0.022m/s2。
Set the glass plate 6 at v0Entering an air floatation furnace 2 at the speed of =0.2m/s, and enabling a =0.022m/s2Substituting the running distance S =20m into the formula S = v0t+(1/2)at2And solving to obtain t =35s, namely the running time of the glass plate in the air floatation furnace is 35 seconds.
Let t =35s, v0Substitution of =0.2m/s into the formula v = v0+ at, solved to v =0.97m/s, i.e. the tapping speed of the glass sheet is 0.97 m/s.
The temperature rise rate of the photovoltaic glass in the air flotation furnace 2 is set to be 6 ℃/s, and then the temperature of the glass plate in the air flotation furnace is raised by 210 ℃ and is 410 ℃ lower than 620 ℃.
In the actual production, the glass plate is heated to 410 ℃ in the roller furnace 1 and then is heated by v0And (3) feeding the mixture into the air flotation furnace 2 at a speed of 0.2m/s, and discharging the mixture at the speed of 0.97m/s after suspension operation for 35 seconds at the final temperature of 620 ℃ completely according with the technical indexes of the discharging temperature and the discharging speed of the heating device.
The glass is heated to 410 ℃ in the roller furnace 1 and is far below the softening point of the glass, the hardness of the glass is high, and the roller table 8 cannot damage the surface quality of the glass.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way; the invention is not limited to the embodiments described herein, but is capable of other embodiments according to the invention, and may be used in various other applications, including, but not limited to, industrial. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments by the technical entity of the present invention all still belong to the protection scope of the technical solution of the present invention.
Claims (3)
1. A heating device for glass tempering comprises a roller hearth furnace and an air floatation furnace, and is characterized in that the roller hearth furnace and the air floatation furnace are adjacently arranged in front of and behind the air floatation furnace, and an outlet of the roller hearth furnace is connected with an inlet of the air floatation furnace; an air floating platform is arranged in the air floating furnace, the air floating platform is respectively provided with a group of straight spray holes and inclined spray holes, the straight spray holes are vertically upward, and the inclined spray holes are inclined upward towards the advancing direction of the glass; the inclined jet holes comprise two rows, the two rows of inclined jet holes are symmetrically distributed on two sides of the transverse central line of the air bearing table, and the distance between the two rows of inclined jet holes is smaller than the width of the glass plate to be heated; the straight spray holes and the inclined spray holes form a rectangular array together.
2. The heating device for glass tempering according to claim 1, wherein an included angle between the inclined spray holes and a horizontal plane is 80-89 degrees.
3. A heating apparatus for glass tempering according to claim 1 or 2, wherein said inclined jet hole has the same diameter as that of said straight jet hole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921445158.4U CN210528776U (en) | 2019-09-02 | 2019-09-02 | Heating device for glass tempering |
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| CN201921445158.4U CN210528776U (en) | 2019-09-02 | 2019-09-02 | Heating device for glass tempering |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110422995A (en) * | 2019-09-02 | 2019-11-08 | 中建材蚌埠玻璃工业设计研究院有限公司 | A kind of heating device for glass tempering |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110422995A (en) * | 2019-09-02 | 2019-11-08 | 中建材蚌埠玻璃工业设计研究院有限公司 | A kind of heating device for glass tempering |
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