CN107586013A - A kind of thin tempering glass production method - Google Patents

Abstract

A method for producing thin tempered glass, comprising the steps of heating a glass plate in a heating furnace, transporting the heated glass plate out of the heating furnace through a conveying mechanism, and sending the glass plate to a cooling air grid for rapid cooling, The step of slow cooling and the step of lowering the glass plate. The present invention heats the surface and core of the glass plate while cooling. At this time, the rapid cooling makes the surface of the glass plate cool down rapidly, while the temperature of the core of the glass plate remains unchanged or changes relatively little due to heating, so that The temperature difference between the surface and the center of the glass plate is formed, which improves the tempering quality of the tempered thin plate glass, and the prepared tempered thin glass can meet the national requirements for tempered glass for building materials.

Description

A kind of thin tempered glass production method

technical field

The invention relates to the field of glass tempering, in particular to a method for producing thin tempered glass.

Background technique

At present, the tempering of glass is mainly realized through two ways: one is chemical tempering, and the other is physical tempering. Chemical tempering is to place the glass in molten alkali salt, so that the ions with smaller radius in the surface layer of the glass exchange with the ions with larger radius in the molten salt, and finally form compressive stress layers on both surfaces of the glass, and form tension stress layers inside the glass. The stress layer can achieve the purpose of improving the mechanical strength and temperature shock resistance of the glass. Physical toughening is that when ordinary flat glass is heated in a heating furnace to close to the softening temperature of the glass, the internal stress is eliminated through its own deformation, and then the glass is removed from the heating furnace, and then high-pressure cold air is blown to both sides of the glass with a multi-head nozzle to make it Quickly and evenly cooled to room temperature, tempered glass can be produced.

For thin glass, especially thin glass with a thickness below 3mm, due to the limited thickness of the glass, when the glass is quenched, the two surfaces and the core are cooled almost simultaneously, and it is difficult to form a temperature gradient from the surface to the core. It is also difficult to form a balance between the compressive stress generated on the glass surface and the internal tensile stress, and it is difficult for thin plate glass to be completely tempered through traditional physical tempering experiments.

When using traditional tempering methods to produce thin tempered glass, there are mainly the following two difficulties: first, when the thin glass is out of the furnace, the glass that leaves the furnace door first cools down rapidly, which has a great impact on the quality of tempered glass; second, The tempering process of thin glass requires high wind pressure.

In response to the first problem, a patent proposes a butt joint structure between the heating furnace body and the quenching section. This convex structure ensures that the glass surface leaving the furnace door still has hot air flow through it, so that the glass will not be cooled rapidly. This kind of design has a complex structure and wastes energy. Every time the furnace door is opened, the airflow in the heating furnace will be disturbed, which will affect the stability of the heating furnace body.

For the second problem, most of the existing technologies use compressed air for cooling. The disadvantage of this solution is that the pressure of the compressed air drops rapidly after opening, and as time goes by, the pressure of the compressed air also decreases. This pressure fluctuation will have an adverse effect on the toughened quality of thin glass. Another method is to equip a high-power high-pressure fan to provide a sufficiently high air pressure. Using a high-power high-pressure fan consumes less energy. Large and unsatisfactory.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of the above prior art and provide a thin tempered glass production method that can continuously temper thin glass plates with a thickness below 3 mm, and the tempering standard can meet the national requirements for tempered glass for building materials.

The technical solution adopted by the present invention to achieve the above object is: a method for producing thin tempered glass, comprising the following steps:

(1) Transport the glass plate to the heating furnace through the conveying mechanism for tempering and heating;

(2) Send the heat-treated glass plate out of the heating furnace through the conveying mechanism, and send it into the cooling air grid for rapid cooling; wherein, a number of heaters are arranged in the cooling air grid, and the glass plate is rapidly cooled. The heater heats the surface and core of the glass plate at the same time, so that a temperature gradient is formed from the surface of the glass plate to the core;

(3), after completing the step (2) rapid cooling process, slowly cool the glass plate;

(4) After completing the slow cooling process in step (3), the glass plate is removed.

In the present invention, the conveying mechanism is a roller conveying mechanism or an air-floating conveying mechanism.

In the present invention, the cooling air grid adopts a cast volute fan to output cooling air to the surface of the glass plate.

In the present invention, the cooling air grid includes an upper air grid and a lower air grid, each of which includes at least one air grid assembly, and the heater is arranged between adjacent air grid assemblies in the same air grid.

In the step (2) of the present invention, the heater is turned on before the glass plate is rapidly cooled, so that the heating power of the heater can reach the required efficiency when the glass plate is rapidly cooled.

In the present invention, preferably, a transitional heating section is provided between the heating furnace and the cooling grid, and the transitional heating section includes a transitional conveying mechanism (a part of the conveying mechanism) and a heater for simultaneously heating the surface and core of the glass plate .

Preferably, the heating temperature of the transitional heating section is 630-650°C.

In the present invention, the heater is an infrared heater or a microwave heater.

Preferably, the heater is an infrared heater with a wavelength of 1000-5000nm.

Beneficial effects: After the thin glass plate is heated to the softening temperature by the heating furnace, the glass plate enters the cooling air grid, and at this time the glass plate begins to be cooled rapidly. Since the thickness of the thin glass plate is relatively thin, the surface temperature of the glass plate will reach the center during the rapid cooling process. It is not easy to form a temperature difference, but the present invention installs a heater in the cooling grid, and the glass plate enters the cooling grid, and simultaneously heats the surface and the center of the glass plate while cooling. At this time, the rapid cooling makes the glass plate The surface is rapidly cooled, while the temperature at the center of the glass plate remains unchanged or changes slightly due to heating, thus forming a temperature difference from the surface of the glass plate to the center, improving the tempering quality of the tempered thin glass. The prepared tempered thin glass can meet the national requirements for tempered glass for building materials.

The heater of the present invention adopts infrared heating or microwave heating, which can transfer and penetrate the heat to the core of the thin glass plate, so that a temperature gradient can be formed from the core to the surface of the thin glass plate, and keep the compressive stress and the tensile stress at the core of the glass surface. Balance, improve the tempering effect of thin plate glass.

In the present invention, there is also a heater between the heating furnace and the cooling air grid, which is mainly aimed at heating the surface and the core of the glass plate at the same time, so as to maintain the temperature of the surface and the core of the glass plate, and avoid the cooling of the thin glass that leaves the furnace door of the heating furnace first. Affect the quality of tempered glass.

In the second step of the present invention, the cooling air grid uses a cast volute high-pressure fan to output cooling air to the glass surface, replacing the compressed air for cooling, and overcomes the adverse effects on the tempering quality of the thin glass caused by the pressure drop and instability caused by the use of compressed air. The problem.

Description of drawings

Fig. 1 is the schematic diagram of heating furnace and cooling air grid of the present invention.

Reference signs: 1, heating furnace, 2, conveying mechanism, 3, glass plate, 4, transitional heating section, 5, cooling air grid, 6, air grid assembly, 7, heater, 8, upper air grid, 9, lower wind Grid, 10, transition delivery mechanism.

detailed description

In order to facilitate the understanding of the technical means, creative features and goals achieved by the present invention, the present invention will be further elaborated below in conjunction with specific drawings, but the scope of protection claimed by the present invention is not limited to the scope described in the specific implementation.

A kind of thin tempered glass production method, as shown in Figure 1, comprises the following steps:

(1) Place the glass plate 3 horizontally on the conveying mechanism 2, and transport the glass plate 3 to the heating furnace 1 through the conveying mechanism 2 for tempering and heating; in this step, the glass plate is heated to a tempering temperature of 650~720°C.

(2) The heat-treated glass plate 3 is transported out of the heating furnace 1 through the conveying mechanism 2, the glass plate 3 is discharged at a speed of 100~1000mm/s, and the glass plate 3 is transported into the cooling grid 5 by the conveying mechanism 2 for cooling , the glass plate 3 output from the heating furnace 1 is quenched in the cooling grid 5, and several heaters 7 are arranged in the cooling grid 5 to heat the surface and the core of the glass plate at the same time, so that the surface of the glass plate is to the core. The temperature gradient is formed at the part; the heater 7 is turned on before the glass plate enters the cooling grid 5, so that when the glass plate enters the cooling grid 5, the heating power of the heater 7 can reach the required efficiency.

(3) After step (2) is completed, the glass plate is slowly cooled until the glass plate can be partially touched;

(4) The bottom of the glass plate.

Wherein, the cooling air grid 5 comprises an upper air grid 8 and a lower air grid 9, each of the upper air grid 8 and the lower air grid 9 includes at least one air grid assembly 6, and the heater is arranged between adjacent air grid assemblies 6 in the same air grid . The heater 7 can be arranged between the air grill assemblies 6 of the upper air grill 8 , or between the air grill assemblies 6 of the lower air grill 9 , or at the same time in the respective air grill assemblies 6 of the upper air grill 8 and the lower air grill 9 between.

In the present invention, the conveying mechanism 2 is a roller conveying mechanism or an air-floating conveying mechanism. The conveying mechanism 2 and the transitional conveying mechanism 10 listed in FIG. 1 are both roller conveying mechanisms; the roller conveying mechanism can also be replaced with an air-floating conveying mechanism according to the prior art.

As shown in Figure 1, a transitional heating section 4 is also provided between the heating furnace 1 and the cooling air grid 5, and the transitional heating section 4 includes a transitional conveying mechanism 10 for transporting the glass plate 3 output from the heating furnace 1, and the transition A heater 7 for simultaneously heating the surface and core of the glass plate 3 is provided above and below the conveying mechanism 10 .

Wherein, the cooling air grid 5 uses a cast volute high-pressure fan to output cooling air to the surface of the glass plate 3 . In the present invention, heaters are installed in the transitional heating section and the cooling grille, and the heaters 7 arranged in the transitional heating section 4 and the cooling grille 5 are infrared heaters or microwave heaters. When using infrared heating, the wavelength of infrared rays is 1000-5000nm, preferably, infrared rays with a wavelength of 2000-3000nm; for microwave heating, the wavelength is 1-1000mm. Among them, infrared heating can realize fixed-point heating, and the heating effect of the core of the glass plate is better.

Preferably, the heating temperature of the transitional heating section 4 is 630-650° C., which is within the softening temperature range of glass.

Example 1

A method for producing thin tempered glass, comprising the following steps: (1), placing a glass plate 3 horizontally on a conveying mechanism 2, transporting the glass plate 3 to a heating furnace 1 through the conveying mechanism 2 for tempering and heating, and the heating temperature is 700 ℃, wherein, the specification of the glass plate 3 is length×width=600mm×400mm, the thickness of the glass plate D=2.5mm, and the heating time of the glass plate t=105s;

(2) The heat-treated glass plate 3 is transported out of the heating furnace 1 through the conveying mechanism 2. The glass plate 3 is discharged at a speed of 400mm/s. The conveying mechanism 2 transports the glass plate into the cooling grid 5 for cooling, and the output is heated. The glass plate 3 of the furnace 1 is first rapidly cooled in the cooling grid 5, and at the same time, several heaters 7 are arranged on the cooling grid 5 to heat the surface and the center of the glass plate 3 at the same time, so that the surface of the glass plate 3 reaches the core. A temperature gradient is formed; before the glass plate 3 is rapidly cooled, the heater 7 is turned on, so that when the glass plate 3 is rapidly cooled, the heating power of the heater 7 can reach the required efficiency. Wherein, the heater 7 is heated by infrared rays with a wavelength of 2000-3000 nm, and the wind pressure is set to 95% of the rated wind pressure.

(3) After step (2) is completed, the glass plate 3 is slowly cooled until the glass plate 3 can be partially touched;

(4) The bottom of the glass plate.

The thin tempered glass prepared in this embodiment has a particle size of 55 grains in a 50mm×50mm square frame.

Example 2

A method for producing thin tempered glass, comprising the following steps: (1) Heating treatment: horizontally place a glass plate 3 on a conveying mechanism 2, transport the glass plate 3 to a heating furnace 1 through the conveying mechanism 2 for tempering and heating, and the heating temperature is is 650°C, wherein, the specification of the glass plate 3 is length×width=600mm×400mm, and the heating time of the glass plate is t=100s;

(2) Perform temperature compensation processing in the transitional heating section: transport the heat-treated glass plate out of the heating furnace 1 through the conveying mechanism 2, and the glass plate is discharged from the furnace at a speed of 500mm/s, and enter the transitional conveying mechanism 10, which is equipped with several The heater, the heater is mainly aimed at heating the surface and the core of the glass plate 3 at the same time, the heating temperature is 630° C., and keeps the temperature of the surface and the core of the glass plate 3 .

(3) Quenching process: the glass plate 3 enters the cooling air grid 5 after passing through the transition conveying mechanism 10. At this time, the cooling air grid 5 provides a high wind pressure, which can quickly cool the surface of the glass plate 3, and at the same time cool some of the cooling air grids. The heater heats the surface and core of the glass plate 3 at the same time, while the surface of the glass plate 3 cools, it mainly heats the core of the glass to maintain the temperature of the core and form a temperature difference between the core and the surface. It is required to turn on the heater 7 before the glass plate is rapidly cooled, so that the heating power of the glass plate 3 can reach the required efficiency when the glass plate 3 is rapidly cooled. Wherein, the heater 7 adopts microwave heating, and the wind pressure is set to 95% of the rated wind pressure.

(4) Slow cooling treatment: After step (3), the glass plate is transported to the slow cooling zone 6 by the conveying mechanism 2 for further cooling to achieve the effect of being able to touch small pieces of glass.

(5) Lower piece of glass plate.

The thin tempered glass prepared in this embodiment has a particle size of 60 grains in a 50mm×50mm square frame.

Example 3

A method for producing thin tempered glass, comprising the following steps: (1) Heat treatment: horizontally place a glass plate 3 on a conveying mechanism 2, transport the glass plate 3 to a heating furnace 1 through the conveying mechanism 2 for tempering and heating, and the heating temperature is 720°C, wherein, the specification of the glass plate 3 is length×width=600mm×400mm, the thickness of the glass plate D=3mm, and the heating time of the glass plate t=90s;

(2) Temperature compensation processing at the conveying mechanism outside the furnace: the heat-treated glass plate 3 is transported out of the heating furnace through the conveying mechanism, and the glass plate 3 is discharged at a speed of 1000mm/s, and enters the transition conveying mechanism 10, which is equipped with A plurality of heaters 7, the heater 7 is mainly aimed at heating the surface and the core of the glass plate at the same time, the heating temperature is 650° C., and keeps the temperature of the surface and the core of the glass plate.

(3) Rapid cooling: After passing through the transition conveying mechanism 10, the conveying mechanism 2 transports the glass plate 3 into the cooling air grid 5, and the cooling air grid 5 has a high wind pressure, which can quickly cool the surface of the glass plate 3, and at the same time, it is arranged in this area A plurality of heaters 7, the heater 7 mainly heats the surface and the core of the glass plate 3 at the same time, while the glass surface cools, it mainly heats the core of the glass to maintain the temperature of the core and form a temperature difference between the core and the surface. It is required to turn on the heater in advance when the glass plate enters this area, so that the heating power of the glass plate 3 can reach the required efficiency when entering this area. Wherein, the heater 7 adopts microwave heating, the fan power of the cooling air grid 5 is 315kw, and the wind pressure is set to 95% of the rated wind pressure.

(4) Slow cooling treatment: Slowly cool the glass plate after completing the rapid cooling process in step (3) until the glass plate reaches the effect that can be touched locally;

(5) Lower piece of glass plate.

The thin tempered glass prepared in this embodiment has a particle size of 62 grains in a 50mm×50mm square frame.

Comparative example 1

The specification of the glass plate is length×width=600mm×400mm, the thickness of the glass plate is 2.5mm, the heating time of the glass plate is 120s, the heating temperature in the heating furnace is 700°C, the furnace speed is 450mm/S, and the wind pressure is set to 75% of the rated wind pressure.

Parameters such as particle size, stress, and flatness of the thin glass plate are compared when the heater of the present invention is turned on and not turned on:

Turn on the heater: the particle size in the 50mm×50mm box is 15 grains, the stress is 123MPa, and the flatness of the edge of the thin glass plate is less than or equal to 0.25.

Without turning on the heater: the particle size in a 50mm×50mm square frame is 5 grains, the stress is 110MPa, and the flatness of the edge of the thin glass plate is less than or equal to 0.25.

Comparative example 2

The specification of the glass plate is length × width = 600mm × 400mm, the thickness of the glass plate is 2.5mm, the heating time of the glass plate is 120s, the heating temperature in the heating furnace is 700°C, the furnace speed is 600mm/S, and the air pressure is set to 75% of the rated wind pressure.

Parameters such as particle size, stress, and flatness of the thin glass plate are compared when the heater of the present invention is turned on and not turned on:

Turn on the heater: the stress is 115MPa, and the flatness of the edge of the thin glass plate is less than or equal to 0.3.

Do not turn on the heater: the stress is 96MPa, and the flatness of the edge of the thin glass plate is less than or equal to 0.3.

Claims (9)

1. A method for producing thin tempered glass, characterized in that, comprising the following steps: (1) Transport the glass plate to the heating furnace through the conveying mechanism for heating; (2) Send the heat-treated glass plate out of the heating furnace through the conveying mechanism, and send it into the cooling air grid for rapid cooling; wherein, a number of heaters are arranged in the cooling air grid, and the glass plate is rapidly cooled. The heater heats the surface and core of the glass plate at the same time, so that a temperature gradient is formed from the surface of the glass plate to the core; (3), after completing the step (2) rapid cooling process, slowly cool the glass plate; (4) After completing the slow cooling process in step (3), the glass plate is removed. 2. A method for producing thin tempered glass, characterized in that: the conveying mechanism is a roller conveying mechanism or an air-floating conveying mechanism. 3. A thin tempered glass production method according to claim 1, characterized in that: the cooling air grid uses a cast volute fan to output cooling air to the surface of the glass plate. 4. A thin tempered glass production method according to claim 1, characterized in that: the cooling air grid includes an upper air grid and a lower air grid, each of which includes at least one air grid assembly, and the heater is arranged on the same Between adjacent air grill components in the air grill. 5. A thin tempered glass production method according to claim 1, characterized in that: in step (2), the heater is turned on before the glass plate is quenched, so that when the glass plate is quenched, the heating power of the heater able to achieve the required efficiency. 6. A method for producing thin tempered glass according to claim 1, characterized in that: a transitional heating section is provided between the heating furnace and the cooling grille, and the transitional heating section includes a transitional conveying mechanism and a glass plate surface and core A heater that heats both parts at the same time. 7. A thin tempered glass production method according to claim 6, characterized in that: the heating temperature of the transitional heating section is 630-650°C. 8. A thin tempered glass production method according to any one of claims 1, 4, 5 or 6, characterized in that the heater is an infrared heater or a microwave heater. 9. A thin tempered glass production method according to claim 7, characterized in that the heater is an infrared heater with a wavelength of 1000-5000nm.