Glass annealing process and production equipment thereof

Abstract

The invention discloses a glass annealing process and production equipment thereof. According to the technical scheme, the heating uniformity and the cooling efficiency in the glass annealing process are improved. The annealing process comprises three steps of heating, constant-temperature heat preservation and cooling. A segmented heating method is adopted in the heating stage, and the glass is ensured to reach the annealing temperature through heating at different rates; a high-temperature short-time and low-temperature long-time method is used in the constant-temperature heat preservation stage, so that the internal stress of the glass is In the cooling stage, the temperature is quickly reduced to 300 DEG C, and then is reduced to normal temperature at a relatively slow rate, so that cold cracking of the glass is avoided. The production equipment comprises a heating cavity, a soaking cavity and a cooling cavity. A heating module and an edge thermal compensation mechanism in the heating cavity ensure that the edge temperature of the glass is uniform by adjusting hot air; the temperature sensor monitors the glass surface temperature in real time, the control module adjusts the heating and cooling processes according to feedback data, and therefore the high-quality annealing effect of glass products is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of glass manufacturing technology, and in particular to a glass annealing process and production equipment thereof. Background Art

[0002] During the forming process, glass undergoes drastic temperature and shape changes, which leave thermal stress in the glass. This thermal stress will reduce the strength and thermal stability of glass products. If it is cooled directly, it is likely to break by itself during the cooling process or during subsequent storage, transportation and use (commonly known as cold explosion of glass). In order to eliminate the cold explosion phenomenon, glass products must be annealed after forming. The existing glass annealing process mainly goes through four stages: heating, heat preservation, slow cooling and fast cooling.

[0003] However, the existing annealing process still has some problems in the production process of glass products, which will reduce the quality of glass annealing molding. For example, in the heating stage, the traditional process often adopts a single heating rate, which leads to uneven temperature distribution inside the glass product, affecting the effective release of stress. At the same time, the constant temperature insulation stage also lacks precise control of different temperature ranges, resulting in insufficient or too long insulation time, further affecting the annealing effect. In the cooling process, due to the lack of flexibility in the cooling rate and the division of cooling stages, new stresses are generated when the glass products are cooled, and even cracks may occur. Summary of the invention

[0004] The present invention provides a glass annealing process and a production device thereof, which solves the problem of reducing the glass annealing molding quality due to process steps in the existing annealing process.

[0005] To achieve the above purpose, the present invention adopts a technical solution: a glass annealing process, the steps are as follows:

[0006] S1. Heating: After the glass product is fed into the annealing device, the device is started and the temperature in the device is raised to the glass annealing temperature by a staged heating method to heat the glass product;

[0007] S2. Constant temperature insulation: Use high temperature for a short time and low temperature for a long time to keep the glass products in a stable temperature range to release the stress inside the glass;

[0008] S3, cooling: first control the temperature inside the equipment to drop rapidly to 300°C at a set rate T1, then slow down the cooling rate to T2, let the temperature inside the equipment drop from 300°C to 200°C at a cooling rate of T2, and finally cool from 200°C to room temperature at room temperature; wherein the rate T1 must be greater than the rate T2.

[0009] The present invention is further configured that the specific steps of the staged heating method of S1 are as follows:

[0010] a1: Slow heating stage: the temperature inside the equipment starts from room temperature and rises to 500°C at a constant rate of 5°C / min;

[0011] a2: Temperature treatment: Keep the temperature in the equipment at 480-510℃ for 15 minutes;

[0012] a3: Rapid heating: Let the temperature in the equipment rise to the annealing temperature of the glass product at a rate of 10℃ / min.

[0013] The present invention is further configured that the specific steps of the high temperature short time and low temperature long time method of S2 are as follows:

[0014] b1: High temperature short-time insulation: After the temperature of the equipment cavity rises to the annealing temperature, keep the glass products at the annealing temperature for 10 minutes;

[0015] b2: Low temperature and long time heat preservation: After the glass products are kept at the annealing temperature for 10 minutes, the temperature in the equipment drops to 450-500℃ and then keeps warm for 30-40 minutes.

[0016] The present invention is further configured such that the rate T1 is 10°C / min; and the rate T2 is 5°C / min.

[0017] A glass annealing production equipment comprises a base with a cavity, wherein a conveying mechanism and a heating cavity, a heat absorbing cavity and a cooling cavity are sequentially arranged along the conveying direction thereof, and an insulating door is arranged between adjacent areas;

[0018] The heating chamber is provided with a heating module A located on the upper and lower sides of the conveying mechanism and an edge heat compensation mechanism located on both sides of the conveying mechanism, and the edge heat compensation mechanism is used to blow hot air to the edge of the glass product to adjust the edge temperature of the glass; the heat-averaging chamber is provided with a heating module B and an air circulation mechanism; the cooling chamber includes a primary cooling section provided with a direct cooling air duct mechanism, a secondary cooling section provided with a cross air duct mechanism, and a natural cooling section connected to the outside, an airtight partition is provided between the primary cooling section and the secondary cooling section, and the airtight partition is used to block the cooling air flow of the secondary cooling section from flowing to the primary cooling section; it also includes temperature sensors respectively arranged in the heating chamber and the heat-averaging chamber, and the temperature sensors are electrically connected to the heating modules A, B and the edge heat compensation mechanism through the control module.

[0019] The present invention is further configured such that the edge heat compensation mechanism includes a wind curtain assembly arranged on both sides of the heating chamber, the wind curtain assembly is provided with an adjustable wind hole unit and an air inlet pipe port, the air inlet pipe port is connected to a hot air generator through a hot air duct, and the wind curtain assembly is also provided with a fan located between the air inlet pipe port and the wind hole unit; it also includes an air flow sensor arranged at the wind hole, and the wind hole unit and the fan are electrically connected to the air flow sensor and the temperature sensor through a control module.

[0020] The present invention is further configured such that the wind curtain assembly comprises a main frame arranged on the side wall of the heating chamber, the main frame is rotatably connected to a wind direction plate on one side facing the conveying mechanism, the wind direction plate is connected to a control motor connected to the control module, and the control motor can control the wind direction plate to swing up and down; the air hole unit and the airflow sensor are arranged on the wind direction plate;

[0021] The wind hole unit includes a plurality of long strip-shaped wind holes distributed on the wind direction plate, the upper and lower edges of the wind holes are rotatably connected with opening and closing plates, a pair of the opening and closing plates are connected with a rotating motor, and the rotating motor is connected to the control module for adjusting the direction of the wind hole and the opening and closing size of the wind hole.

[0022] The present invention is further configured such that the heating module A includes a mounting frame arranged in the heating chamber, and a plurality of resistance wires are arranged on the mounting frame at intervals, and there are gaps between adjacent resistance wires; it also includes a heat shielding plate arranged between the mounting frame and the inner wall of the heating chamber, the heat shielding plate is in the shape of an elongated strip and has an arc-shaped cross-section, one side of the plate facing the glass product and the resistance wire is recessed inwardly as a reflecting surface, and the other side is a heat insulating surface; the reflecting surface is used to guide the heat radiation of the resistance wire to the target area of ​​the glass; it also includes an angle adjustment mechanism arranged between the heating chamber and the heat shielding plate, and the angle adjustment mechanism is used to adjust the angle of the reflecting surface.

[0023] The present invention is further configured such that the angle adjustment mechanism includes a fixing frame fixedly mounted on the inner wall of the heating chamber, and both ends of the heat shielding plate are rotatably mounted on the fixing frame via a rotating shaft. An adjusting motor connected to a control module is also disposed on the fixing frame, and an output shaft of the adjusting motor is connected to the rotating shaft via a gear.

[0024] The present invention is further configured such that the heat shielding plate includes a plurality of shielding strips, both ends of which are rotatably arranged on a fixing frame and one end of which is connected to an adjusting motor; arc-shaped chamfers are arranged at both ends of the shielding strips, and the chamfers of adjacent shielding strips are close to each other.

[0025] In summary, the beneficial effects of the present invention are:

[0026] Compared with the prior art, the present invention can ensure that the temperature of the glass products is evenly distributed during the annealing process by adopting a segmented heating method, precise temperature control and insulation, and flexible cooling rate adjustment, thereby maximally eliminating internal stress and improving the strength and thermal stability of the glass products. In the heating stage, the combination of three sub-stages, namely, slow heating, temperature equalization, and rapid heating, avoids the phenomenon of uneven temperature inside the glass caused by a single heating rate in the traditional process, so that the glass products are in a more stable state before entering the annealing temperature. In the constant temperature insulation stage, the insulation method of high temperature for a short time and low temperature for a long time is adopted, so that the internal stress of the glass products can be effectively released, and the precise control of the insulation time and temperature can avoid the negative effects caused by insufficient or too long insulation. In the cooling stage, by controlling the change of the cooling rate, the glass products can be gradually cooled down at a set rate in different cooling stages, thereby avoiding the problem of glass breakage caused by too fast cooling, and ensuring the stability of the glass products during the cooling process.

[0027] In addition, the present invention further optimizes the uneven temperature distribution by setting an edge heat compensation mechanism in the annealing equipment to adjust the temperature of the glass edge. The mechanism uses the wind curtain technology, an adjustable wind hole unit and a hot air generator to control the edge temperature of the glass product, so that the edge and central part of the glass product can achieve a more uniform annealing effect, thereby avoiding the cold explosion phenomenon caused by the large temperature difference between the edge and the center of the glass. The heat shielding plate in the heating chamber and its angle adjustment mechanism further improve the utilization efficiency of thermal radiation, making the heating of the glass product more uniform and reducing the temperature fluctuation of the glass surface caused by uneven radiation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a flowchart of the first embodiment.

[0029] Figure 2 It is a three-dimensional structural diagram of the second embodiment.

[0030] Figure 3 It is an internal schematic diagram of the second embodiment.

[0031] Figure 4 It is a structural schematic diagram of the heating chamber.

[0032] Figure 5 It is a schematic diagram of the air curtain assembly.

[0033] Figure 6 This is an exploded view of the air curtain assembly.

[0034] Figure 7 This is an enlarged view of the air hole unit.

[0035] Figure 8 It is a structural diagram of the heat shielding plate.

[0036] Fig. 9 This is an enlarged view of the shielding strip.

[0037] Reference numerals: 1, base; 2, conveying mechanism; 21, conveyor belt;

[0038] 3. Heating chamber; 30. Edge heat compensation mechanism;

[0039] 301, wind curtain assembly; 3011, main frame; 3012, wind deflector; 3013, control motor;

[0040] 302, air hole unit; 3021, opening and closing plate; 3022, rotating motor;

[0041] 303, air inlet; 304, hot air generator; 305, air flow sensor;

[0042] 31. Heating module A; 311. Mounting frame; 312. Resistance wire; 313. Heat shielding plate; 3131. Shielding strip; 3132. Chamfer;

[0043] 314, angle adjustment mechanism; 3141, fixing frame; 3142, adjustment motor;

[0044] 4. Heat-saturating chamber; 40. Heating module B; 41. Air circulation mechanism; 411. Fan; 412. Air outlet;

[0045] 5. Cooling chamber; 50. Direct cooling air duct mechanism; 51. Cross air duct mechanism; 52. Airtight partition; 53. Lifting rod; 54. Natural cooling section; 6. Insulated door; 7. Temperature sensor. DETAILED DESCRIPTION

[0046] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the present invention.

[0047] Embodiment 1:

[0048] like Figure 1 As shown, this embodiment discloses a glass annealing process, the steps are as follows:

[0049] S1. Heating: After the glass product is fed into the annealing device, the device is started and the temperature in the device is raised to the glass annealing temperature by a staged heating method to heat the glass product;

[0050] By heating, glass products can be heated evenly to the required annealing temperature to slow down the temperature gradient inside the glass, thereby avoiding glass breakage or deformation due to thermal stress. Temperature uniformity during the heating process is very critical for glass annealing. Too fast temperature changes lead to local temperature differences, which in turn cause glass breakage or deformation. By controlling the temperature rise by the staged heating method, the problem of uneven thermal stress caused by a single rate of heating is avoided, thereby ensuring a more uniform heating process and reducing stress inside the glass.

[0051] The specific steps of the staged heating method are as follows:

[0052] a1: Slow heating stage: the temperature inside the equipment starts from room temperature and rises to 500°C at a constant rate of 5°C / min;

[0053] A lower heating rate can avoid a large temperature difference between the glass surface and the interior, thereby preventing thermal cracks caused by local overheating. This temperature rise rate ensures uniform temperature on the glass surface and inside, while also avoiding the accumulation of stress in the glass caused by rapid heating.

[0054] A heating rate of 5°C / min can effectively control the temperature gradient and avoid cracks or deformation. If the heating rate is too slow, the glass heating time will be too long, and the overall process efficiency will be reduced. Too long a heating time will also cause uneven heating of the glass, resulting in thermal stress. Too slow a heating rate will also cause the glass surface to reach the annealing temperature first, while the inside is still not fully heated to a sufficient temperature, resulting in a large temperature difference between the inside and the surface, resulting in stress.

[0055] The annealing temperature is set at 500℃, which is suitable for the annealing of most common glasses. The stress in the glass begins to be released without softening or deforming. By precisely controlling this temperature, the temperature difference between the surface and the inside of the glass product can be minimized, thereby enhancing the strength and stability of the product.

[0056] If the annealing temperature is lower than 500℃, the stress inside the glass is not completely released, resulting in residual stress inside the glass. In addition, the annealing temperature is not enough for the glass molecules to reach a full dynamic equilibrium, resulting in new cracks or deformations in the glass during the cooling process. If the temperature is higher than 550℃, the glass will soften excessively, lose its original shape, and deform. Moreover, if the temperature is too high for a long time, the uniformity of the glass molecular structure will be destroyed, affecting its final physical properties and strength, resulting in a decrease in glass performance.

[0057] a2: Temperature treatment: After the glass has been slowly heated up, keep the temperature in the equipment at 480-510℃ for 15 minutes;

[0058] After slowly heating the glass products to 500°C, they can be subjected to a uniform temperature treatment. Maintaining the uniform temperature treatment for a certain period of time helps to make the temperature distribution inside the glass uniform, thereby further adjusting the molecular structure of the glass, reducing the impact of thermal stress, making the glass structure more uniform, and enhancing the overall quality of the glass.

[0059] The 480℃-510℃ uniform temperature treatment can ensure that the glass stays within this temperature range for a period of time to promote the uniformity of the temperature inside the glass and reduce the internal stress caused by temperature differences. The 15-minute time setting is optimized based on the physical properties of the glass. This time is enough to achieve a balanced temperature distribution of the glass and avoid energy waste or excessive heat treatment due to too long a time.

[0060] a3: Rapid heating: After the glass products have been treated with uniform temperature, the temperature in the equipment is raised to the annealing temperature of the glass products at a rate of 10°C / min; the faster heating rate can effectively shorten the heating time and quickly make the glass reach the required annealing temperature. Rapid heating can ensure that when the glass enters the annealing stage, the time delay in the annealing process is reduced, and at the same time, it can avoid the accumulation of internal stress caused by being in a low temperature state for too long, thereby accelerating the production process, improving process efficiency, and maintaining the stability of glass quality.

[0061] S2. Constant temperature insulation: Use high temperature for a short time and low temperature for a long time to keep the glass products in a stable temperature range to release the stress inside the glass.

[0062] When the glass products that have been heated to the annealing temperature are sent to the heat-saturating chamber 4 of the equipment, the glass products will first be kept warm at high temperature for a short time: after the temperature of the equipment chamber rises to the annealing temperature, the glass products are kept at the annealing temperature for 10 minutes; by keeping the glass products at high temperature for 10 minutes, the stress inside the glass can be fully released. This is because at high temperatures, the molecular movement of the glass intensifies, which helps to evenly distribute and relieve stress. Therefore, short-term high-temperature treatment can effectively "balance" the stress in the glass, so that the local stress in the glass can be effectively released quickly and excessive stress can be prevented from remaining. If the high-temperature insulation time is too long, the surface quality will be reduced, and uneven surface texture will appear, affecting the appearance and subsequent use.

[0063] After keeping the glass products warm at high temperature for a short time, keep them warm at low temperature for a long time: after keeping the glass products at annealing temperature for 10 minutes, the temperature in the equipment drops to 450-500℃, and then keeps warm for 30-40 minutes; the purpose of this process is to allow the glass to continue to eliminate the remaining internal stress at a lower temperature to avoid incomplete release of stress in the glass due to excessive temperature or too fast cooling. At this time, the molecular structure of the glass tends to be stable, and long-term insulation at low temperature can ensure that the glass will not crack or break due to uneven stress during the cooling process.

[0064] S3, cooling: first control the temperature inside the equipment to drop rapidly to 300°C at a set rate T1, T1 is 10°C / min, then slow down the cooling rate to T2, let the temperature inside the equipment drop from 300°C to 200°C at a cooling rate T2, rate T2 is 5°C / min; finally cool from 200°C to room temperature at room temperature; the rate T1 must be greater than the rate T2.

[0065] By rapidly cooling at a rate of T1, the temperature of the glass surface is first rapidly reduced to 300°C, and then the cooling rate is slowed down to T2, thereby avoiding excessive temperature differences during the cooling process and reducing internal stresses caused by uneven cooling. The above-mentioned staged cooling process allows the glass to dissipate heat rapidly at higher temperatures, reducing stresses caused by temperature differences, and then by slowing down the cooling rate (T2), it is possible to ensure that the molecular structure of the glass is more stable, avoiding cracks or deformations caused by too rapid cooling.

[0066] Among them, if the cooling rate of rate T1 is too fast, especially when the annealing temperature reaches 300°C, the temperature difference between the surface and the inside of the glass is too large, causing internal stress or even cracks in the glass, affecting the strength and stability of the glass, and the excessively fast cooling rate will also increase the dimensional changes of the glass products, causing deformation or irregular surface quality; and if the cooling rate of T2 is too high, it will cause the glass to generate new internal stresses during the cooling process. These internal stresses cannot be effectively released, which can easily cause the glass to break or produce microcracks.

[0067] If the cooling rate T1 is too slow, the heating process of the glass is too long, resulting in the stress released during the annealing process not being completely eliminated, affecting the subsequent cooling effect. Especially in the cooling stage after annealing, too slow a cooling rate causes the glass to be excessively exposed to high temperatures, increasing energy consumption and extending the production cycle; and if the cooling rate T2 is too low, the glass will still maintain an excessively high temperature and fail to quickly reach room temperature, resulting in insufficient release of glass stress or uneven cooling, resulting in thermal stress and microcracks.

[0068]

[0069]

[0070] Embodiment 2

[0071] On the basis of the first embodiment, in order to complete the annealing process of the first embodiment, the present application provides a glass annealing production equipment, such as Figure 2-3 As shown, it comprises a base 1 with a cavity, a conveying mechanism 2 is arranged in the cavity, and a heating cavity 3, a heat-averaging cavity 4 and a cooling cavity 5 are arranged in sequence along the conveying direction thereof, and an insulating door 6 is arranged between adjacent areas;

[0072] Among them, the conveying mechanism 2 adopts a heat conduction conveyor belt 21, and the material of the conveyor belt 21 is metal. It is operated by a motor and a transmission gear connected to the control module, thereby realizing the conveying of the glass; and the insulating door 6 arranged between the three cavities can prevent the airflows between different cavities from interfering with each other, ensure that the temperature control of each stage is carried out independently, and avoid affecting the annealing effect. The insulating door 6 is rotatably set on the base 1, and can be an insulating pad of flexible material. When the glass passes by, the insulating pad will be pushed away by the push of the glass, thereby realizing the conveying of the glass between the cavities.

[0073] like Figure 3-4 As shown, the heating chamber 3 is provided with heating modules A31 located at the upper and lower sides of the conveying mechanism 2 and edge heat compensation mechanisms 30 located at both sides of the conveying mechanism 2. The edge heat compensation mechanisms 30 are used to blow hot air to the edges of the glass products to adjust the edge temperature of the glass; the heating modules A31 are arranged at the upper and lower sides of the conveying mechanism 2. Since the conveyor belt 21 is made of metal, the heat below the conveyor belt 21 can also be conducted to the top of the conveyor belt 21. At the same time, in order to facilitate the conduction of heat, a number of through holes can also be opened on the conveyor belt 21; the setting of the through holes makes it easier for heat to be conducted to the glass surface.

[0074] Further, such as Figure 5-7 As shown, when the glass product passes through the heating chamber 3, the edge temperature will be affected by uneven heating, resulting in a large temperature difference at the edge of the glass, which will cause stress concentration in the glass and affect the annealing effect. In order to avoid this situation, the present application sets an edge heat compensation mechanism 30 on both sides of the heating chamber 3. The edge heat compensation mechanism 30 includes a wind curtain assembly 301 arranged on both sides of the heating chamber 3, and an adjustable air hole unit 302 and an air inlet 303 are arranged on the wind curtain assembly 301. The air inlet 303 is connected to a hot air generator 304 through a hot air duct. The wind curtain assembly 301 is also provided with a fan 411 located between the air inlet 303 and the air hole unit 302; it also includes an air flow sensor 305 arranged at the air hole, and the air hole unit 302 and the fan 411 are electrically connected to the air flow sensor 305 and the temperature sensor 7 through a control module.

[0075] When the temperature sensor 7 in the heating chamber 3 detects that the temperature of the glass edge is too low, the control module will control the edge heat compensation mechanism 30 to start, and then blow hot air on the glass edge through the wind curtain assembly 301 to adjust the temperature of the glass edge, ensure temperature uniformity, and reduce internal stress. Among them, the temperature sensor 7 is an infrared temperature sensor 7, which can detect the change of glass temperature in real time, and transmit the temperature data to the terminal through the control module, so that the staff can check and inspect it conveniently.

[0076] Among them, Figure 5-6As shown, the air curtain assembly 301 includes a main frame 3011 arranged on the side wall of the heating chamber 3, the main frame 3011 is rotatably connected to a wind direction plate 3012 toward one side of the conveying mechanism 2, the wind direction plate 3012 is connected to a control motor 3013 connected to the control module, and the control motor 3013 can control the wind direction plate 3012 to swing up and down; the air hole unit 302 and the airflow sensor 305 are arranged on the wind direction plate 3012;

[0077] When the control module controls the air curtain assembly 301 to start, the hot air generator 304 set on the base 1 first sends the heated air into the air curtain assembly 301 through the air inlet 303, and the hot air is transmitted to the fan 411 part of the air curtain assembly 301 through the pipeline. Then, after the fan 411 is started, the hot air is blown to the air hole unit 302 to ensure the uniform distribution of the hot air. The working principle of the fan 411 is to increase the wind pressure to make the hot air flow stably and send air to the air hole unit 302 below.

[0078] And as Figure 6 As shown, the wind deflector 3012 is rotatably arranged on the inner side of the main frame 3011 and an arc-shaped mounting groove is arranged on the inner side of the main frame 3011, and a connecting plate rotatably matched with the mounting groove is arranged on the side of the wind deflector 3012, and the connecting plate is connected to the control motor 3013. The control motor 3013 can control the direction of the wind deflector 3012, thereby controlling the wind direction of all the wind hole units 302 for adjustment. When the temperature sensor 7 detects that the temperature of a certain height area on the side of the glass is lower, the control motor 3013 will be driven so that all the wind hole units 302 are heated toward a certain area.

[0079] like Figure 7 As shown, in order to accurately heat a certain part of the glass side, the air hole unit 302 includes a plurality of long strip-shaped air holes distributed on the wind direction plate 3012, and the upper and lower edges of the air holes are rotatably connected with an opening and closing plate 3021, and a pair of opening and closing plates 3021 are connected with a rotating motor 3022, and the rotating motor 3022 is connected to the control module for adjusting the direction of the air hole and the opening and closing size of the air hole. When the infrared temperature sensor 7 detects that the temperature of a certain position on the edge of the glass is too low, the two rotating motors 3022 of one of the air holes are driven, so as to control the pair of opening and closing plates 3021 to accurately heat a certain part of the glass. At the same time, for different shapes or irregular shapes of glass, by accurately controlling the blowing direction and air volume of each air hole, it can ensure that any position on the edge of the glass can be accurately heated, thereby improving the uniformity of glass heating.

[0080] like Figure 3 , 8-9, the heating module A31 includes a mounting frame 311 arranged in the heating chamber 3, and a plurality of spaced resistance wires 312 are arranged on the mounting frame 311, and there are gaps between adjacent resistance wires 312; when the glass product enters the heating chamber 3, the control module will control the heating wire to be energized and heated, thereby realizing the heating of the heating chamber 3.

[0081] A heat shielding plate 313 is also arranged between the mounting frame 311 and the inner wall of the heating chamber 3. The heat shielding plate 313 is in the shape of a long strip and has an arc-shaped cross section. One side of the heat shielding plate 313 facing the glass product and the resistance wire 312 is inwardly concave as a reflecting surface, and the other side is a heat insulating surface. The reflecting surface is a reflective metal material, such as aluminum-plated stainless steel and other materials. It has a high thermal radiation reflectivity and can guide the thermal radiation of the resistance wire 312 to the target area of ​​the glass. It has a curved arc structure, and its shape and curvature are carefully designed so that the propagation path of the thermal radiation is optimally guided to avoid heat loss to other areas of the heating chamber 3. It also includes an angle adjustment mechanism 314 arranged between the heating chamber 3 and the heat shielding plate 313. The angle adjustment mechanism 314 is used to adjust the angle of the reflecting surface. By adjusting the angle of the reflecting surface, the position of the area where the thermal radiation is focused on the glass can be changed, so that it can be adjusted according to the specific heating requirements caused by different shapes of the glass products, ensuring that the heat of different positions and different shapes and thicknesses of the glass is evenly and effectively transferred to the glass surface, avoiding glass breakage or excessive stress due to uneven heating.

[0082] The angle adjustment mechanism 314 includes a fixing frame 3141 fixedly arranged on the inner wall of the heating chamber 3, and both ends of the heat shielding plate 313 are rotatably arranged on the fixing frame 3141 through a rotating shaft. The fixing frame 3141 is also provided with an adjusting motor 3142 connected to the control module, and the output shaft of the adjusting motor 3142 is connected to the rotating shaft through a gear. During the heating process of the glass product, the temperature sensor 7 can detect the temperature of each position of the glass product in real time, and then the temperature data will be sent to the terminal. Through the analysis of the terminal, the control module will control the adjusting motor 3142 to drive the heat shielding plate 313 to rotate, so that the reflecting surface of the heat shielding plate 313 rotates so that the heat radiation is mainly concentrated in the area with lower temperature, so as to achieve heating of this area, thereby ensuring that each position of the glass product is evenly heated.

[0083] like Figure 8-9 As shown, the heat shielding plate 313 includes a plurality of shielding strips 3131, both ends of which are rotatably arranged on a fixing frame 3141 and one end of which is connected to an adjusting motor 3142; arc-shaped chamfers 3132 are arranged at both ends of the shielding strips 3131, and the chamfers 3132 of adjacent shielding strips 3131 are close to each other; the heat shielding plate 313 is composed of a plurality of long shielding strips 3131, each of which is connected to an adjusting motor 3142 and can be adjusted individually, so as to cope with glass products of different shapes.

[0084] And as Figure 2-3 As shown, a heating module B40 and an air circulation mechanism 41 are provided in the heat-averaging chamber 4; wherein the heating module B40 has the same structure as the heating module A31, and both are resistance wires 312 arranged above and below the conveyor belt 21; and the air circulation mechanism 41 is an air outlet 412 arranged on the side of the heat-averaging chamber 4, and the air outlet 412 is connected to a fan 411 through a pipeline, and the fan 411 can flow the air in the heat-averaging chamber 4 to make the internal heat distribution uniform; and in order to ensure the constant temperature in the heat-averaging chamber 4, an electric heating wire can also be provided in the air outlet 412 or in the pipeline, and the electric heating wire can heat the airflow; and the electric heating wire is connected through a control module, so as to realize linkage control with the heating module B40.

[0085] like Figure 2-3 As shown, the cooling chamber 5 includes a primary cooling section provided with a direct cooling air duct mechanism 50, a secondary cooling section provided with a cross air duct mechanism 51, and a natural cooling section 54 connected to the outside, and an airtight partition 52 is provided between the primary cooling section and the secondary cooling section, and the airtight partition 52 is used to block the cooling air flow of the secondary cooling section from flowing to the primary cooling section; the direct cooling air duct mechanism 50 mainly includes a fan 411 and an air outlet 412, and when the glass product enters the cooling chamber 5, it will first enter the primary cooling section. At this time, the direct cooling air duct mechanism 50 in the cooling chamber 5 blows cold air strongly through the fan 411, and directly sprays the cold air onto the surface of the glass product; and due to the direct effect of the cold air, the temperature of the glass product drops rapidly, entering the first stage of the cooling process. The cooling speed in this stage is relatively fast, and the purpose is to quickly reduce the temperature of the glass to avoid cracks or deformation caused by excessive temperature difference between the surface and the interior of the glass.

[0086] Then, after the glass product has been rapidly cooled in the primary cooling section, it will enter the secondary cooling section. At this time, the cross duct mechanism 51 begins to work. The cross duct mechanism 51 is mainly composed of a fan 411 and a plurality of cross-arranged ducts. The cross-arranged duct openings are arranged on the peripheral side of the cooling chamber 5. When started, each duct blows cold air in different directions to generate cross-flows. The cross-flows form a cold air flow around the glass product. Through this cross-flow method, the cooling of the glass surface becomes more uniform.

[0087] In the secondary cooling stage, the cooling process is relatively gentle, and the temperature is further reduced mainly through cross airflow. At this time, the temperature and wind speed of the airflow have gradually slowed down, ensuring that the temperature of the glass drops gradually without causing damage to the surface due to excessive cooling.

[0088] The airtight partition 52 sliding up and down between the primary cooling section and the secondary cooling section can ensure that the cold air in the primary cooling section will not flow back into the secondary cooling section, thereby avoiding the mixing of cold air and resulting in a decrease in cooling efficiency. The airtight partition 52 is opened and closed by the lifting rod 53, thereby avoiding contact between the airtight partition 52 and the glass.

[0089] The temperature sensors 7 located in the heating chamber 3 , the heat-averaging chamber 4 and the cooling chamber 5 are all infrared temperature sensors 7 . The temperature sensors 7 are electrically connected to the heating modules A31 and B and the edge heat compensation mechanism 30 through the control module.

[0090] The control module mainly includes:

[0091] Main control unit (microcontroller): This unit is responsible for processing the data from each temperature sensor 7 and adjusting the working state of the heating module and the thermal compensation mechanism according to the data. Common microcontroller models include STM32 series, Arduino or industrial-grade PLC (programmable logic controller).

[0092] Data acquisition unit: This unit is responsible for receiving temperature data from each temperature sensor 7 and transmitting the data to the main control unit through a communication interface (such as I2C, SPI, Modbus, etc.). The data acquisition module performs preliminary processing on the data, such as denoising and filtering.

[0093] Actuator control unit: This unit is used to control the electrical connection with the heating module A31, heating module B40, edge heat compensation mechanism 30 and other devices. Through the current regulation module, the start and stop of these devices and the power regulation are controlled.

[0094] Display and feedback unit: used to display the current temperature status and allow the operator to view the data of each temperature sensor 7. In addition, the working status of each heating module can be adjusted as needed, and the working parameters can be set.

[0095] An accurate closed-loop control system is formed between the temperature sensor 7 (infrared temperature sensor 7), the control module, the heating module A31 / B and the edge thermal compensation mechanism 30. Each temperature sensor 7 collects temperature data of the surface of the glass product in real time and transmits it to the control module. The control module adjusts the working state of the heating module according to these data to ensure that the temperature of the glass product remains in the optimal range. At the same time, the control module adjusts the edge thermal compensation mechanism 30 according to the change of the edge temperature to ensure that the edge temperature of the glass product is uniform and consistent with the center temperature. At the same time, in order to more accurately detect the temperature of each position of the glass product, the final collected data can be integrated through the distribution of infrared sensors to finally obtain a thermal imaging image of the glass product.

[0096] First, these sensors cover the glass surface and collect temperature data at the same time to generate a thermal image. Each sensor pixel responds to the infrared radiation intensity of the glass surface at its location, which is then converted into temperature data. The temperature data corresponding to each detection unit (pixel) is then plotted on the display to form a full picture. The temperature distribution of each point is displayed on the infrared image, forming an intuitive thermal image.

[0097] Working principle: First, the glass products enter the heating chamber 3 of the equipment through the heat conduction conveyor belt 21. The conveyor belt 21 is made of metal material and is driven by a motor and a transmission gear to ensure the smooth transmission of the glass between the various chambers. The design of the conveyor belt 21 can effectively conduct heat to the glass surface to ensure uniform heating of the glass. During the movement of the conveyor belt 21, the insulation door 6 installed inside the equipment effectively blocks the airflow interference between the heating chamber 3, the heat-averaging chamber 4 and the cooling chamber 5, ensuring that the temperature control of each chamber is independent and avoiding mutual influence between different temperature environments.

[0098] When the glass product enters the heating chamber 3, the heating module A31 will generate heat above and below the conveyor belt 21, and evenly transfer the heat to the glass surface. In order to ensure the uniformity of the temperature of the glass edge, the edge heat compensation mechanism 30 on both sides of the heating chamber 3 will blow hot air to the edge of the glass through the wind curtain assembly 301. This hot air not only helps to adjust the temperature of the glass edge, but also effectively avoids stress concentration caused by excessive temperature difference at the glass edge. The wind curtain assembly 301 can accurately control the direction and flow of the hot air, and through the adjustment of the wind direction plate 3012, every part of the glass, especially the edge part, can be evenly heated.

[0099] After the heating process is completed, the glass product enters the heat-absorbing chamber 4. At this time, the air circulation mechanism 41 in the heat-absorbing chamber 4 begins to function, and the fan 411 circulates the air evenly through the pipeline to ensure the uniform distribution of the temperature in the chamber. The heating module B40 further cooperates with the electric heating wire to heat the air flow, maintain a constant high temperature environment in the chamber, ensure the stability of the heating state of the glass, and further ensure the uniform distribution of the temperature of the glass.

[0100] Next, the glass product enters the cooling chamber 5, and the cooling process is divided into two stages. In the primary cooling section, the direct cooling duct mechanism 50 blows cold air through the fan 411 to quickly reduce the temperature of the glass surface. This stage is mainly to prevent the temperature difference between the glass surface and the interior from being too large, thereby avoiding the occurrence of cracks or deformation. After the glass passes through the primary cooling section, it enters the secondary cooling section, at which time the cross duct mechanism 51 begins to work. The cross-arranged duct openings spray cold air to the glass surface in multiple directions through the fan 411, forming a surrounding cross airflow to ensure a uniform reduction in the temperature of the glass surface.

[0101] In the cooling chamber 5, the airtight partition 52 plays a vital role in separating the primary cooling section from the secondary cooling section to avoid cross-mixing of cooling airflows, thereby maintaining cooling efficiency. The lifting and lowering of the partition can be adjusted by the control system to ensure that it does not contact the glass products during the cooling process to avoid affecting the cooling effect of the glass.

[0102] The whole working process is coordinated and controlled by the temperature sensor 7 and the control module. An infrared temperature sensor 7 is arranged in each cavity to monitor the temperature of the glass in real time and transmit the data to the main control module. The control module adjusts the working state of each heating module, the edge heat compensation mechanism 30 and the cooling module according to the feedback temperature data. The infrared temperature sensor 7 can accurately detect the temperature changes at different positions of the glass, thereby generating a thermal image to help the operator understand the temperature distribution in real time and ensure the efficient and accurate execution of the annealing process.

[0103] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the design concept of the present invention should be included in the protection scope of the present invention.

Claims

1. A glass annealing process, characterized in that: Here are the steps: S1. Heating: After the glass product is fed into the annealing device, the device is started and the temperature in the device is raised to the glass annealing temperature by a staged heating method to heat the glass product; S2. Constant temperature insulation: Use high temperature for a short time and low temperature for a long time to keep the glass products in a stable temperature range to release the stress inside the glass; S3, cooling: first, control the temperature in the equipment to drop rapidly to 300°C at a set rate T1, then slow down the cooling rate to T2, let the temperature in the equipment drop from 300°C to 200°C at a cooling rate of T2, and finally cool from 200°C to room temperature at room temperature; The rate T1 must be greater than the rate T2.

2. A glass annealing process according to claim 1, characterized in that: The specific steps of the step-by-step heating method of S1 are as follows: a1: Slow heating stage: the temperature inside the equipment starts from room temperature and rises to 500°C at a constant rate of 5°C / min; a2: Temperature treatment: Keep the temperature in the equipment at 480-510℃ for 15 minutes; a3: Rapid heating: Let the temperature in the equipment rise to the annealing temperature of the glass product at a rate of 10℃ / min.

3. A glass annealing process according to claim 1, characterized in that: The specific steps of the high temperature short time and low temperature long time method of S2 are as follows: b1: High temperature short-time insulation: After the temperature of the equipment cavity rises to the annealing temperature, keep the glass products at the annealing temperature for 10 minutes; b2: Low temperature and long time heat preservation: After the glass products are kept at the annealing temperature for 10 minutes, the temperature in the equipment drops to 450-500℃ and then keeps warm for 30-40 minutes.

4. A glass annealing process according to claim 1, characterized in that: The rate T1 is 10°C / min; the rate T2 is 5°C / min.

5. A glass annealing production equipment, used to implement the annealing process described in any one of claims 1 to 4, characterized in that: It comprises a base (1) with a cavity, wherein a conveying mechanism (2) is arranged in the cavity, and a heating cavity (3), a heat-averaging cavity (4) and a cooling cavity (5) are arranged in sequence along the conveying direction thereof, and an insulating door (6) is arranged between adjacent areas; The heating chamber (3) is provided with a heating module A (31) located on the upper and lower sides of the conveying mechanism (2) and an edge heat compensation mechanism (30) located on both sides of the conveying mechanism (2), and the edge heat compensation mechanism (30) is used to blow hot air to the edge of the glass product to adjust the edge temperature of the glass; the heat-averaging chamber (4) is provided with a heating module B (40) and an air circulation mechanism (41); the cooling chamber (5) comprises a primary cooling section provided with a direct cooling air duct mechanism (50), a secondary cooling section provided with a cross air duct mechanism (51), and a natural cooling section (54) connected to the outside, and an airtight partition (52) is provided between the primary cooling section and the secondary cooling section, and the airtight partition (52) is used to block the cooling air flow of the secondary cooling section from flowing toward the primary cooling section; and the cooling chamber (5) also comprises temperature sensors (7) respectively provided in the heating chamber (3) and the heat-averaging chamber (4), and the temperature sensors (7) are electrically connected to the heating modules A (31), B and the edge heat compensation mechanism (30) through a control module.

6. The glass annealing production equipment according to claim 5, characterized in that: The edge heat compensation mechanism (30) comprises an air curtain assembly (301) arranged on both sides of the heating chamber (3); the air curtain assembly (301) is provided with an adjustable air hole unit (302) and an air inlet pipe (303); the air inlet pipe (303) is connected to a hot air generator (304) via a hot air duct; the air curtain assembly (301) is also provided with a fan (411) located between the air inlet pipe (303) and the air hole unit (302); and also comprises an air flow sensor (305) arranged at the air hole; the air hole unit (302) and the fan (411) are electrically connected to the air flow sensor (305) and a temperature sensor (7) via a control module.

7. The glass annealing production equipment according to claim 6, characterized in that: The wind curtain assembly (301) comprises a main frame (3011) arranged on the side wall of the heating chamber (3); the main frame (3011) is rotatably connected to a wind direction plate (3012) on one side facing the conveying mechanism (2); the wind direction plate (3012) is connected to a control motor (3013) connected to the control module; the control motor (3013) can control the wind direction plate (3012) to swing up and down; the air hole unit (302) and the airflow sensor (305) are arranged on the wind direction plate (3012); The wind hole unit (302) comprises a plurality of long strip-shaped wind holes distributed on a wind direction plate (3012), the upper and lower edges of the wind holes are rotatably connected to opening and closing plates (3021), a pair of the opening and closing plates (3021) are connected to a rotating motor (3022), and the rotating motor (3022) is connected to a control module for adjusting the direction of the wind hole and the opening and closing size of the wind hole.

8. The glass annealing production equipment according to claim 5, characterized in that: The heating module A (31) comprises a mounting frame (311) arranged in the heating chamber (3), wherein a plurality of resistance wires (312) are arranged at intervals on the mounting frame (311), and gaps exist between adjacent resistance wires (312); and further comprises a heat shielding plate (313) arranged between the mounting frame (311) and the inner wall of the heating chamber (3), wherein the heat shielding plate (313) is in the shape of an elongated strip and has an arc-shaped cross section, wherein one side of the heat shielding plate (313) facing the glass product and the resistance wires (312) is inwardly recessed as a reflection surface, and the other side is a heat insulation surface; the reflection surface is used to guide the heat radiation of the resistance wires (312) to a target area of ​​the glass; and further comprises an angle adjustment mechanism (314) arranged between the heating chamber (3) and the heat shielding plate (313), wherein the angle adjustment mechanism (314) is used to adjust the angle of the reflection surface.

9. The glass annealing production equipment according to claim 8, characterized in that: The angle adjustment mechanism (314) comprises a fixing frame (3141) fixedly arranged on the inner wall of the heating chamber (3); the two ends of the heat shielding plate (313) are rotatably arranged on the fixing frame (3141) via a rotating shaft; an adjustment motor (3142) connected to a control module is also arranged on the fixing frame (3141); the output shaft of the adjustment motor (3142) is connected to the rotating shaft via a gear.

10. The glass annealing production equipment according to claim 9, characterized in that: The heat shielding plate (313) comprises a plurality of shielding strips (3131), both ends of which are rotatably arranged on a fixing frame (3141) and one end of which is connected to an adjusting motor (3142); arc-shaped chamfers (3132) are arranged at both ends of the shielding strips (3131), and the chamfers (3132) of adjacent shielding strips (3131) are close to each other.

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