Thick plate glass as well as preparation method and application thereof

Abstract

The invention relates to the technical field of glass production, and particularly discloses thick plate glass as well as a preparation method and application thereof. Comprising the following steps: preheating: feeding glass into a preheating furnace for preheating, setting the preheating temperature of the upper surface of the preheating furnace to be 320-360 DEG C, setting the preheating temperature of the lower surface of the preheating furnace to be 310-350 DEG C, and setting the rotating speed efficiency of a preheating convection fan; and heating: preheating the glass, heating the glass in a heating furnace, moving the glass in the heating furnace, setting the heating temperature of the upper surface of the heating furnace to be 680-690 DEG C, setting the heating temperature of the lower surface of the heating furnace to be 670-680 DEG C, and obtaining the thick plate glass after heating is completed. By reducing convection in-furnace corner loss and increasing the heat convection heating efficiency of the middle part, the overall quality of the thick plate glass is improved, and the conditions of hot spots and rime fog in the middle of the glass are reduced. In addition, heating is more reasonable, electricity is saved, and the production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of glass production, and in particular to thick plate glass and a preparation method and application thereof. Background Art

[0002] In the traditional tempered glass production process, special attention should be paid to the following points: 1. Temperature control: When ordinary transparent flat glass is tempered, the minimum temperature of the glass is usually required to reach above its transition temperature Tg, that is, 40-50°C. However, the imbalance between heat supply and glass heat absorption will cause physical bending during heat absorption, which will affect the overall performance of the glass. 2. Cooling rate: The common method of physical tempering is air-cooled tempering, which is to heat the glass to below the softening temperature and then cool it evenly and quickly. In this process, the outside cools rapidly and solidifies, while the inside cools slowly, thereby generating compressive stress and enhancing the strength of the glass. For thick plate glass, too fast or uneven cooling may cause breakage. 3. Production efficiency and quality control: When processing by traditional tempering method, there are problems such as low productivity and product defects, which prompts the industry to seek more efficient operation methods to improve productivity and product quality.

[0003] The disadvantages of existing tempering technology are that the thick plate glass is prone to corner drop and overheating during the entire heating process, and fails to perform reasonable heat according to the thermal history of the glass. Therefore, it is necessary to provide a thick plate glass and its preparation method and application, so as to better control the quality of the glass surface and reduce production costs. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the above-mentioned prior art. To this end, the present invention provides a thick plate glass and a preparation method and application thereof, so as to better control the quality of the glass surface and reduce the production cost.

[0005] The inventive concept of the present invention is: to set a spherical temperature field through heating elements, heating power, and heat convection function, reduce the convection loss in the corners of the furnace, increase the heat convection heating efficiency in the middle, and thus improve the overall quality. 1. The glass enters the preheating furnace for heating, and the low-temperature slow heating parameters are called at this time; 2. After the glass is preheated and enters the heating furnace, the speed of heat supply is changed by changing the heating power and the set temperature to match the speed of heat absorption of the glass.

[0006] The preheating parameters focus on the slow supply of low heat to cater to the characteristics of slow heat absorption of thick plate glass in the early stage due to thickness gradient. The most obvious is that the thickness difference of the glass causes inconsistent heat absorption speed between the surface and the inside. However, in the later stage, as the glass gradually approaches the softening temperature, the temperature difference in thickness is significantly reduced, and the heat absorption rate is slowly reduced. The glass gradually softens. According to the asynchrony of heat absorption caused by the thickness difference between the surface and the middle of the thick plate glass, two heating methods are made to adjust. The optimization is achieved through the change of temperature in the upper and lower parts of the preheating, the design of the convection model, and the spatial design of the temperature field. The above factors are combined and realized using a large multi-modal model of temperature control.

[0007] A first aspect of the present invention provides a method for preparing thick plate glass.

[0008] Specifically, the following steps are included:

[0009] Preheating: After the glass is loaded, it enters the preheating furnace for preheating. The preheating temperature of the upper surface of the preheating furnace is set to 320-360°C, the preheating temperature of the lower surface of the preheating furnace is set to 310-350°C, and the speed efficiency of the preheating convection fan is set;

[0010] Heating: After preheating, the glass enters the heating furnace for heating. The glass moves in the heating furnace. The heating temperature of the upper surface of the heating furnace is set to 680-690°C, and the heating temperature of the lower surface of the heating furnace is set to 670-680°C. After heating is completed, thick plate glass is obtained.

[0011] Preferably, the preheating temperature of the upper surface of the preheating furnace is greater than the preheating temperature of the lower surface of the preheating furnace.

[0012] Preferably, the heating temperature of the upper surface of the heating furnace is greater than the heating temperature of the lower surface of the heating furnace.

[0013] Preferably, the preheating convection fan speed efficiency includes the preheating convection fan speed efficiency on the upper surface of the glass and the preheating convection fan speed efficiency on the lower surface of the glass.

[0014] Preferably, the speed efficiency of the preheating convection fan on the upper surface of the glass is 40-60%.

[0015] Further preferably, the speed efficiency of the preheating convection fan on the upper surface of the glass is 40-45%.

[0016] More preferably, the speed efficiency of the preheating convection fan on the upper surface of the glass is 45%.

[0017] Preferably, the speed efficiency of the preheating convection fan on the lower surface of the glass is 30-50%.

[0018] Further preferably, the speed efficiency of the preheating convection fan on the lower surface of the glass is 30-40%.

[0019] More preferably, the preheating convection fan on the lower surface of the glass has a speed efficiency of 30%.

[0020] Preferably, the preheating time is 400 to 560 seconds.

[0021] More preferably, the preheating time is 400 to 500 seconds.

[0022] More preferably, the preheating time is 400s.

[0023] Preferably, the heating time is 400 to 500 seconds.

[0024] Further preferably, the heating time is 450s.

[0025] More preferably, the heating time is 400s.

[0026] Preferably, the glass moves in the heating furnace at a speed of 230-260 mm / s.

[0027] Further preferably, the glass moves in the heating furnace at a speed of 230-240 mm / s.

[0028] More preferably, the glass moves in the heating furnace at a speed of 230 mm / s.

[0029] Preferably, the thickness of the glass is 12 to 19 mm.

[0030] Further preferably, the thickness of the glass is 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, or 19 mm.

[0031] More preferably, the thickness of the glass is 15 mm and 19 mm.

[0032] Preferably, the preheating temperature field is spherical, and needs to be set with a pattern that gradually decreases from the middle to the two ends.

[0033] Preferably, the preheating convection model is spherical. The fan speed is set to gradually decrease from the middle to the surroundings.

[0034] A second aspect of the present invention provides a thick plate glass.

[0035] Specifically, the thick plate glass is prepared by the preparation method provided by the first aspect of the present invention.

[0036] A third aspect of the present invention provides an application of thick plate glass in the field of energy-saving glass.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] The present invention sets a spherical temperature field through heating elements, heating power, and heat convection function, reduces the convection loss in the corner of the furnace, increases the heat convection heating efficiency in the middle, thereby improving the overall quality of thick plate glass, reducing hot spots and white fog in the middle of the glass. In addition, heating is more reasonable, electricity is saved, and production costs are reduced. DETAILED DESCRIPTION

[0039] In order to make the technical scheme of the present invention more clearly understood by those skilled in the art, the following embodiments are listed for illustration. It should be pointed out that the following embodiments do not limit the protection scope of the present invention.

[0040] Unless otherwise specified, the raw materials, reagents or devices used in the following examples can be obtained from conventional commercial sources or by existing known methods.

[0041] Example 1

[0042] A thick plate glass and a preparation method thereof.

[0043] The specific steps are as follows:

[0044] Preheating: After the glass with a thickness of 15mm is loaded on the loading table, it enters the preheating furnace through the transmission roller for preheating. The preheating temperature of the upper surface of the preheating furnace is set to 320℃, the preheating temperature of the lower surface of the preheating furnace is set to 310℃, the speed efficiency of the preheating convection fan on the upper surface of the glass is 45%, and the speed efficiency of the preheating convection fan on the lower surface of the glass is 30%. The preheating is 400s;

[0045] Heating: After preheating, the glass enters the heating furnace for heating. The speed of the glass in the heating furnace is 230 mm / s. The heating temperature of the upper surface of the heating furnace is set to 680°C, and the heating temperature of the lower surface of the heating furnace is set to 670°C. The heating is performed for 400 seconds. After the heating is completed, thick plate glass is obtained.

[0046] Among them, the temperature field uses a sphere, and a graph that gradually decreases from the middle to the two ends needs to be set; the convection model uses a sphere, and the fan speed is set to gradually decrease from the middle to the surroundings.

[0047] Processing effect: The thick plate glass obtained in Example 1 has no corner drop, no overheating spots, and has qualified strength.

[0048] Example 2

[0049] A thick plate glass and a preparation method thereof.

[0050] The specific steps are as follows:

[0051] Preheating: After the glass with a thickness of 15mm is loaded on the loading table, it enters the preheating furnace through the transmission roller for preheating. The preheating temperature of the upper surface of the preheating furnace is set to 350℃, the preheating temperature of the lower surface of the preheating furnace is set to 310℃, the speed efficiency of the preheating convection fan on the upper surface of the glass is 45%, and the speed efficiency of the preheating convection fan on the lower surface of the glass is 30%. The preheating is 400s;

[0052] Heating: After preheating, the glass enters the heating furnace for heating. The speed of the glass in the heating furnace is 230 mm / s. The heating temperature of the upper surface of the heating furnace is set to 680°C, and the heating temperature of the lower surface of the heating furnace is set to 670°C. The heating is performed for 400 seconds. After the heating is completed, thick plate glass is obtained.

[0053] Among them, the temperature field uses a sphere, and a graph that gradually decreases from the middle to the two ends needs to be set; the convection model uses a sphere, and the fan speed is set to gradually decrease from the middle to the surroundings.

[0054] Processing effect: The thick plate glass obtained in Example 2 has no corner drop, no overheating spots, and has qualified strength.

[0055] Comparative Example 1

[0056] A thick plate glass and a preparation method thereof.

[0057] The specific steps are as follows:

[0058] Preheating: After the glass with a thickness of 15mm is loaded on the loading table, it enters the preheating furnace through the transmission roller for preheating. The preheating temperature of the upper surface of the preheating furnace is set to 320℃, and the preheating temperature of the lower surface of the preheating furnace is set to 360℃. The speed efficiency of the preheating convection fan on the upper surface of the glass is 45%, and the speed efficiency of the preheating convection fan on the lower surface of the glass is 30%. The preheating is 400s;

[0059] Heating: After preheating, the glass enters the heating furnace for heating. The speed of the glass in the heating furnace is 230 mm / s. The heating temperature of the upper surface of the heating furnace is set to 680°C, and the heating temperature of the lower surface of the heating furnace is set to 670°C. The heating is performed for 400 seconds. After the heating is completed, thick plate glass is obtained.

[0060] Among them, the temperature field uses a sphere, and a graph that gradually decreases from the middle to the two ends needs to be set; the convection model uses a sphere, and the fan speed is set to gradually decrease from the middle to the surroundings.

[0061] Processing effect: the thick plate glass obtained in comparative example 1 has no corner drop and no overheating spot, but there is white fog in the middle area of ​​the glass, and the strength is qualified.

[0062] Comparative Example 2

[0063] A thick plate glass and a preparation method thereof.

[0064] The specific steps are as follows:

[0065] Preheating: After the glass with a thickness of 15mm is loaded on the loading table, it enters the preheating furnace through the transmission roller for preheating. The preheating temperature of the upper surface of the preheating furnace is set to 450℃, the preheating temperature of the lower surface of the preheating furnace is set to 310℃, the speed efficiency of the preheating convection fan on the upper surface of the glass is 45%, and the speed efficiency of the preheating convection fan on the lower surface of the glass is 30%. The preheating is 400s;

[0066] Heating: After preheating, the glass enters the heating furnace for heating. The speed of the glass in the heating furnace is 230 mm / s. The heating temperature of the upper surface of the heating furnace is set to 680°C, and the heating temperature of the lower surface of the heating furnace is set to 670°C. The heating is performed for 400 seconds. After the heating is completed, thick plate glass is obtained.

[0067] Among them, the temperature field uses a sphere, and a graph that gradually decreases from the middle to the two ends needs to be set; the convection model uses a sphere, and the fan speed is set to gradually decrease from the middle to the surroundings.

[0068] Processing effect: the thick plate glass prepared in comparative example 2 has an increased number of corner drop, no overheating spots, and a qualified strength.

[0069] Comparative Example 3

[0070] A thick plate glass and a preparation method thereof.

[0071] The specific steps are as follows:

[0072] Preheating: After the glass with a thickness of 15mm is loaded on the loading table, it enters the preheating furnace through the transmission roller for preheating. The preheating temperature of the upper surface of the preheating furnace is set to 460℃, the preheating temperature of the lower surface of the preheating furnace is set to 310℃, the speed efficiency of the preheating convection fan on the upper surface of the glass is 45%, and the speed efficiency of the preheating convection fan on the lower surface of the glass is 30%. The preheating is 400s;

[0073] Heating: After preheating, the glass enters the heating furnace for heating. The speed of the glass in the heating furnace is 230 mm / s. The heating temperature of the upper surface of the heating furnace is set to 680°C, and the heating temperature of the lower surface of the heating furnace is set to 670°C. The heating is performed for 400 seconds. After the heating is completed, thick plate glass is obtained.

[0074] Among them, the temperature field uses a sphere, and a graph that gradually decreases from the middle to the two ends needs to be set; the convection model uses a sphere, and the fan speed is set to gradually decrease from the middle to the surroundings.

[0075] Processing effect: The thick plate glass prepared in comparative example 3 has an increased number of corner drop, no overheating spots, and a qualified strength.

[0076] Comparative Example 4

[0077] A thick plate glass and a preparation method thereof.

[0078] The specific steps are as follows:

[0079] Preheating: After the glass with a thickness of 15mm is loaded on the loading table, it enters the preheating furnace through the transmission roller for preheating. The preheating temperature of the upper surface of the preheating furnace is set to 350℃, the preheating temperature of the lower surface of the preheating furnace is set to 310℃, the speed efficiency of the preheating convection fan on the upper surface of the glass is 45%, and the speed efficiency of the preheating convection fan on the lower surface of the glass is 30%. The preheating is 400s;

[0080] Heating: After preheating, the glass enters the heating furnace for heating. The speed of the glass in the heating furnace is 230 mm / s. The heating temperature of the upper surface of the heating furnace is set to 680°C, and the heating temperature of the lower surface of the heating furnace is set to 670°C. The heating is performed for 400 seconds. After the heating is completed, thick plate glass is obtained.

[0081] Among them, the temperature field uses a square shape, and a figure that gradually decreases from the middle to the two ends needs to be set; the convection model uses a square shape, and the fan speed is set to gradually decrease from the middle to the surroundings.

[0082] Processing effect: The thick plate glass obtained in comparative example 4 has no corner drop, but has obvious overheating spots and the strength is qualified.

[0083] Comparative Example 5

[0084] A thick plate glass and a preparation method thereof.

[0085] The specific steps are as follows:

[0086] Preheating: After the glass with a thickness of 15mm is loaded on the loading table, it enters the preheating furnace through the transmission roller for preheating. The preheating temperature of the upper surface of the preheating furnace is set to 320℃, and the preheating temperature of the lower surface of the preheating furnace is set to 360℃. The speed efficiency of the preheating convection fan on the upper surface of the glass is 45%, and the speed efficiency of the preheating convection fan on the lower surface of the glass is 30%. The preheating is 400s;

[0087] Heating: After preheating, the glass enters the heating furnace for heating. The speed of the glass in the heating furnace is 230 mm / s. The heating temperature of the upper surface of the heating furnace is set to 680°C, and the heating temperature of the lower surface of the heating furnace is set to 670°C. The heating is performed for 400 seconds. After the heating is completed, thick plate glass is obtained.

[0088] Among them, the temperature field uses a square shape, and a figure that gradually decreases from the middle to the two ends needs to be set; the convection model uses a square shape, and the fan speed is set to gradually decrease from the middle to the surroundings.

[0089] Processing effect: The thick plate glass obtained in Example 5 has no corner drop, but has obvious overheating spots and white fog in the middle of the glass, and the strength is qualified.

[0090] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution obtained by any modification, equivalent replacement, improvement, etc. made by a person skilled in the art based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art shall be within the scope of protection determined by the claims.

Claims

1. A method for preparing thick plate glass, characterized in that: The following steps are involved: Preheating: After the glass is loaded, it enters the preheating furnace for preheating. The preheating temperature of the upper surface of the preheating furnace is set to 320-360°C, the preheating temperature of the lower surface of the preheating furnace is set to 310-350°C, and the speed efficiency of the preheating convection fan is set; Heating: After preheating, the glass enters the heating furnace for heating. The glass moves in the heating furnace. The heating temperature of the upper surface of the heating furnace is set to 680-690°C, and the heating temperature of the lower surface of the heating furnace is set to 670-680°C. After heating is completed, thick plate glass is obtained.

2. The preparation method according to claim 1, characterized in that: The preheating temperature of the upper surface of the preheating furnace is greater than the preheating temperature of the lower surface of the preheating furnace.

3. The preparation method according to claim 1, characterized in that: The heating temperature of the upper surface of the heating furnace is greater than the heating temperature of the lower surface of the heating furnace.

4. The preparation method according to claim 1, characterized in that: The preheating convection fan speed efficiency includes the preheating convection fan speed efficiency on the upper surface of the glass and the preheating convection fan speed efficiency on the lower surface of the glass.

5. The preparation method according to claim 4, characterized in that: The speed efficiency of the preheating convection fan on the upper surface of the glass is 40-60%.

6. The preparation method according to claim 4, characterized in that: The speed efficiency of the preheating convection fan on the lower surface of the glass is 30-50%.

7. The preparation method according to claim 1, characterized in that: The preheating time is 400 to 560 seconds.

8. The preparation method according to claim 1, characterized in that: The heating time is 400 to 500 seconds.

9. The preparation method according to claim 1, characterized in that: The glass moves in the heating furnace at a speed of 230-260 mm / s.

10. A thick plate glass, characterized in that: The thick plate glass is produced by the production method according to any one of claims 1 to 9.