Low-temperature difference toughening equipment and toughening process for double-layer coated photovoltaic glass

Abstract

The application discloses a low-temperature-difference toughening equipment and toughening process for double-layer coated photovoltaic glass, belongs to the technical field of glass toughening, and specifically comprises a conveying frame, a combustion furnace, a cooling device and a transition bin frame embedded and installed on the inner wall of the combustion furnace; is based on the traditional low-temperature-difference toughening process, accurately controls a lower heating temperature and a moderate adjustable cooling air pressure, protects the functional coating layer, additionally arranges a U-shaped transition bin frame which is initially integrated with the combustion furnace and can synchronously move with the coated glass, when the coated glass moves out of the combustion furnace, the U-shaped transition bin frame is synchronously pushed out to form a temporary transition protection bin with the cooling device in the up-down direction, synchronous transfer and step precooling are realized, on one hand, the coated glass is maintained in a short inert atmosphere protection, on the other hand, the initial cooling rate and the temperature difference are reduced, effective step cooling is realized, and in addition, the combustion furnace is isolated from the external space to a certain extent, and air exchange between the inside and the outside is reduced.

Description

Technical Field

[0001] This invention relates to the field of glass tempering technology, and more specifically, to low-temperature differential tempering equipment and tempering process for double-layer coated photovoltaic glass. Background Technology

[0002] Double-coated photovoltaic glass refers to the superposition of two nanoscale thin films with different functions (usually anti-reflective films and self-cleaning films) on the same surface of an ultra-white rolled glass (usually the air-facing side), aiming to achieve the goal of "generating more electricity (anti-reflective film) and requiring less maintenance (self-cleaning film)".

[0003] Conventional tempering (680-720℃) uses high heating temperature combined with rapid and strong cooling, which generates a huge temperature difference (usually >200℃) and forms high surface compressive stress (≥90MPa). However, the temperature resistance of the film is much lower than that of the glass itself. If conventional tempering is used, the film composition will undergo chemical changes, crystallization or ablation, resulting in functional failure and color change.

[0004] Therefore, for the preparation of coated photovoltaic glass, a low-temperature differential tempering process is required. This involves using a relatively low heating temperature and gentle, controllable cooling to generate a small temperature difference, forming a moderate surface compressive stress (usually in the range of 24-52 MPa). This stress intensity is sufficient to meet the requirements of photovoltaic modules for mechanical strength and wind pressure resistance, while not damaging the thin film. For example, the glass tempering equipment, glass tempering process, and glass processing technology disclosed in patent number CN115974389A allow for the tempering of ordinary glass and low-emissivity coated glass without separate tempering by changing the processing parameters.

[0005] For the tempering process of coated photovoltaic glass, using an inert atmosphere for protection during the heating stage is a core process requirement with extremely high "necessity". The anti-reflection film and self-cleaning film on the surface of photovoltaic glass are nanoscale functional films with extremely high chemical activity at high temperatures. If an inert atmosphere is not used for protection, the film will suffer irreversible damage when heated to 580-620℃ in an air environment.

[0006] Currently, in traditional tempering processes, when the furnace door is opened, the glass is directly removed to the external environment. The high-temperature glass surface (still in a chemically highly reactive state at 580-620℃) is directly exposed to the oxygen-rich workshop air. This not only easily leads to rapid and severe oxidation of the coating layer but also introduces a severe initial thermal shock, increasing the risk of glass deformation. In addition, the heating furnace contains high-temperature, low-pressure hot gases. When the furnace door is opened, a strong airflow exchange occurs, with denser cold air (workshop air) rapidly rushing into the furnace, while the thermal protective gas inside the furnace is "squeezed out" from the top and escapes into the workshop, making it difficult to restore the atmosphere inside the furnace.

[0007] Therefore, based on actual production conditions, we propose a low-temperature differential tempering equipment and tempering process for double-layer coated photovoltaic glass. Summary of the Invention

[0008] The purpose of this invention is to solve practical production problems, and it provides a low-temperature differential tempering equipment and tempering process for double-layer coated photovoltaic glass.

[0009] The objective of this invention can be achieved through the following technical solution: a low-temperature differential tempering device for double-layer coated photovoltaic glass, comprising a conveyor frame and multiple horizontally linked conveyor rollers for conveying coated glass, wherein a combustion furnace and a cooling device are horizontally and sequentially installed on the conveyor frame, and the combustion furnace has furnace openings at both the left and right ends, and a furnace door is installed at a pair of furnace openings.

[0010] Both the upper and lower ends of the combustion furnace are equipped with atmosphere convection conveying devices that are connected to the interior of the furnace and distributed above and below the conveying rollers.

[0011] The cooling device includes an upper positioning frame and a lower positioning frame, which are distributed on the upper and lower sides of the conveyor frame and are installed at one end of the furnace. Cooling air grids distributed in the vertical direction of the conveyor rollers are embedded on the upper and lower positioning frames. A transition chamber frame embedded in the inner wall of the furnace is also slidably installed on the conveyor frame located on one side of the upper positioning frame. After the transition chamber frame moves to the outside of the furnace, it forms a temporary transition protection chamber with the upper positioning frame, the conveyor frame and the furnace.

[0012] Furthermore, both furnace openings are positioned away from the conveyor rollers, and both furnace doors are installed by being driven up and down by opening and closing push rods mounted on the front and rear end walls of the combustion furnace.

[0013] Furthermore, the pair of atmosphere convection conveying devices are connected to an external atmosphere heating device. Each of the four corners of the combustion furnace has an overflow chamber. The atmosphere heating device is connected to the overflow chamber through a circulation pipe. The atmosphere heating device consists of an atmosphere heating tank and a circulation fan. The air inlet of the circulation fan is connected to the circulation pipe, and its air outlet is connected to the atmosphere heating tank. The air outlet of the atmosphere heating tank is connected to the pair of atmosphere convection conveying devices.

[0014] Furthermore, the transition chamber frame is a U-shaped frame structure with an opening facing the combustion furnace side, and the inner walls on both the front and rear sides of the conveyor frame have sliding cavities that are movably installed with the transition chamber frame.

[0015] Furthermore, the transition chamber frame is fixed with movable plates on the front and rear end walls outside the combustion furnace, which are slidably installed with the front and rear end walls of the conveyor frame. The upper end of the movable plates penetrates the outer walls of the front and rear edges of the upper positioning frame, and electric linear guides for driving the movable plates to move horizontally are fixedly installed on the upper ends of the outer walls of the front and rear edges of the upper positioning frame.

[0016] Furthermore, the upper and lower end walls of the transition chamber frame are movably and sealed with the lower end wall of the upper positioning frame and the upper end wall of the conveying frame, respectively.

[0017] Furthermore, the upper positioning frame is fixedly installed on the conveyor frame, and the lower positioning frame is driven up and down by a lifting platform installed below the conveyor frame. Under the driving action of the lifting platform, the lower positioning frame is initially aligned with the lower end wall of the conveyor frame.

[0018] This invention also proposes a low-temperature differential tempering process for double-layer coated photovoltaic glass, comprising the following steps:

[0019] Step 1: Loading and conveying the film into the furnace: The coated glass is conveyed to the combustion furnace, which maintains a slightly positive pressure and an inert atmosphere, by the conveyor rollers, and the furnace door is closed;

[0020] Step 2, Atmosphere Protection Heating: A pair of atmosphere convection conveying devices are used to apply forced convection atmosphere heating to the upper and lower surfaces of the coated glass, so that the coated glass is heated to the set temperature quickly and evenly. The PLC control system adjusts the heating time in real time according to the thickness of the coated glass and ensures that the temperature uniformity of each point in the furnace is within ±2℃.

[0021] Step 3, Synchronous Transfer and Stepped Pre-cooling: When the heating process ends, open the other furnace door. The conveying rollers and electric linear guide rail inside the furnace start synchronously. The transition chamber frame moves outward synchronously with the coated glass. The outwardly pushed transition chamber frame forms a temporary transition protection chamber with the combustion furnace and cooling device, maintaining a short-term inert atmosphere protection and allowing for natural radiation and convection heat dissipation.

[0022] Step 4, Forced Cooling Tempering: Close the furnace door again, reverse the transition chamber frame until it is retracted into the combustion furnace, immediately start the upper and lower cooling air grids, and begin low temperature difference tempering cooling.

[0023] Step 5: Transport the film.

[0024] Compared with the prior art, the advantages of this invention are:

[0025] 1. Based on the traditional low-temperature differential tempering process, a U-shaped transition chamber frame is added between the combustion furnace and the cooling device. This frame is initially integrated with the combustion furnace and can move synchronously with the coated glass. When the coated glass is removed from the combustion furnace, the U-shaped transition chamber frame is simultaneously pushed out to form a temporary transition protection chamber with the cooling device in the vertical direction. This achieves synchronous transfer and stepped pre-cooling. On the one hand, it can maintain a short-term inert atmosphere protection for the coated glass. On the other hand, it reduces the initial cooling rate and mitigates the temperature difference, achieving effective stepped cooling. In addition, it effectively isolates the combustion furnace from the external space, reduces the exchange of internal and external airflow, and reduces the negative impact of the atmosphere inside the furnace.

[0026] 2. Based on the above, the transition chamber frame is designed to be movable and retractable. After the transition chamber frame is pushed in the reverse direction, the temporary transition protection chamber is quickly released. Compared with the fixed transition chamber structure, on the one hand, it does not require the use of cooling space or the extension of the cooling route. On the other hand, the transition chamber frame is pushed out and quickly reversed and reset simultaneously with the coated glass. This is limited to the brief moment of the mechanism's push-out and push-in, and will not extend the heat dissipation time too much. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the external structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the external structure from another perspective of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure at the junction of the combustion furnace and the transition chamber frame of the present invention;

[0030] Figure 4 This is a schematic diagram of the structure of the present invention when the transition chamber frame is pushed out of the combustion furnace;

[0031] Figure 5 This is a cross-sectional view of the interior of the combustion furnace of the present invention;

[0032] Figure 6 This is a schematic diagram of the internal structure of the present invention during convection heating.

[0033] Figure 7 This is a cross-sectional view of the structure of the present invention when the transition chamber frame is transferred outward along with the coated glass;

[0034] Figure 8 This is a schematic diagram of the structure of the transition chamber frame of the present invention when it forms a temporary transition protection chamber at the cooling device after being pushed outward;

[0035] Figure 9 This is a schematic diagram of the structure of the present invention during convection cooling.

[0036] Figure 10 This is a process flow diagram of the present invention.

[0037] Explanation of the labels in the diagram:

[0038] 1. Conveyor frame; 101. Conveyor roller; 2. Combustion furnace; 201. Furnace opening; 202. Overflow chamber; 3. Furnace door; 4. Opening and closing push rod; 5. Atmosphere convection conveying device; 6. Upper positioning frame; 7. Lower positioning frame; 8. Cooling air grille; 9. Transition chamber frame; 901. Moving plate; 10. Electric linear guide rail; 11. Lifting platform. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0040] Example 1: This invention discloses a low-temperature differential tempering device for double-layer coated photovoltaic glass. Please refer to [link / reference]. Figure 1 , Figure 2 It includes a conveyor frame 1, on which a combustion furnace 2 and a cooling device are horizontally installed in sequence. Multiple conveyor rollers 101 are distributed on the conveyor frame 1, which pass through the combustion furnace 2 and the cooling device and are used to convey coated glass. Furnace openings 201 are opened at both ends of the combustion furnace 2, and furnace doors 3 are installed at a pair of furnace openings 201.

[0041] Please see Figures 3-6 Both ends of the combustion furnace 2 are equipped with atmosphere convection conveying devices 5 that are connected to the interior and distributed above and below the conveying roller 101. Multiple hot air nozzles and air ducts connected to the multiple hot air nozzles are provided on the opposite end walls of a pair of atmosphere convection conveying devices 5.

[0042] A pair of atmosphere convection conveying devices 5 are connected to an external atmosphere heating device. The combustion furnace 2 has an overflow chamber 202 reserved in each of its four corners. The atmosphere heating device is connected to the overflow chamber 202 through a circulation pipe. The atmosphere heating device consists of an atmosphere heating tank and a circulation fan. The air inlet of the circulation fan is connected to the circulation pipe, and its air outlet is connected to the atmosphere heating tank. The air outlet of the atmosphere heating tank is connected to a pair of atmosphere convection conveying devices 5.

[0043] Forced convection heating is applied to the upper and lower surfaces of the coated glass via a pair of atmosphere convection conveying devices 5, rapidly and uniformly heating the coated glass to the set temperature. The heat flow overflows evenly to both sides and, under the action of a circulating fan, returns to the atmosphere heating tank through multiple overflow chambers 202. Inert gases such as nitrogen are injected to provide atmosphere protection and an "inert" environment for the film, ensuring the stability of its chemical composition and structure during the process of reaching the process temperature. This avoids problems such as color difference and performance fluctuation caused by uneven film oxidation, ensuring stable and controllable product quality.

[0044] The cooling device includes an upper positioning frame 6 and a lower positioning frame 7, which are distributed on the upper and lower sides of the conveyor frame 1 and are connected to the combustion furnace 2 on one side. The upper positioning frame 6 and the lower positioning frame 7 are each equipped with cooling air grilles 8 distributed in the vertical direction of the conveyor roller 101. The opposite end walls of the pair of cooling air grilles 8 are also provided with multiple hot air nozzles and air ducts connected to the multiple hot air nozzles. The pair of cooling air grilles 8 are connected to a common external cooling source, which consists of a cooling tank and a circulating fan.

[0045] Forced convection cooling air is applied to the upper and lower surfaces of the coated glass through a pair of cooling air grates 8. The air grates blow air perpendicular to the surface of the coated glass, placing the coated glass in a strong air-cooling environment. This process uses programmed control of the cooling air pressure to achieve an intelligent cooling curve that is "slow at first and then fast" to simulate the effect of multi-segment stepped cooling, thus mitigating the initial thermal shock. During the heating and cooling process, a relatively low heating temperature and a slow and controllable cooling are used to generate a small temperature difference, forming a moderate surface compressive stress for the coated glass.

[0046] Low-temperature differential tempering of double-coated photovoltaic glass is a high-precision, controllable "mild" tempering process. By precisely controlling a low heating temperature (580-620℃) and a gentle, adjustable cooling air pressure, moderate compressive stress is generated in the glass, thereby perfectly protecting its precious functional coating layer while meeting the mechanical performance requirements of photovoltaic modules.

[0047] Example 2: Please refer to Figures 1-2 as well as Figures 3-4 A transition chamber frame 9 is slidably installed on the conveyor frame 1 located on one side of the upper positioning frame 6 and embedded in the inner wall of the combustion furnace 2. The transition chamber frame 9 has extremely high temperature resistance and fatigue resistance. The transition chamber frame 9 is a U-shaped frame structure with an opening facing the combustion furnace 2. The inner walls of the front and rear sides of the conveyor frame 1 are open and closed with sliding cavities that are movably installed with the transition chamber frame 9. The front and rear end walls of the transition chamber frame 9 located on the outer side of the combustion furnace 2 are fixed with movable plates 901 that are slidably installed with the front and rear end walls of the conveyor frame 1. The upper end of the movable plate 901 penetrates the outer walls of the front and rear edges of the upper positioning frame 6, and the upper ends of the outer walls of the front and rear edges of the upper positioning frame 6 are fixed with electric linear guide rails 10 for driving the movable plate 901 to move horizontally.

[0048] Please see Figures 7-9 The upper and lower end walls of the transition chamber frame 9 are movably sealed with the lower end wall of the upper positioning frame 6 and the upper end wall of the conveying frame 1, respectively, so that after the transition chamber frame 9 is pushed out horizontally, the transition chamber frame 9, together with the upper positioning frame 6, the conveying frame 1 and the combustion furnace 2, forms a rectangular temporary transition protection chamber. At the same time as the coated glass is pushed out of the combustion furnace 2, the transition chamber frame 9 is pushed outward simultaneously.

[0049] On the one hand, it can maintain a short-term inert atmosphere for the coated glass, which is particularly beneficial for protecting coating materials that are still sensitive to oxidation at temperatures above 400°C. On the other hand, the coated glass is surrounded by a temporary transition protection chamber, and the initial cooling environment is a preheated "air chamber" with a temperature much higher than the room temperature, which reduces the initial cooling rate and mitigates the temperature difference. This achieves truly effective stepped transition cooling, effectively controls thermal shock stress, and is very beneficial for reducing glass deformation and optimizing stress uniformity. In addition, the temporary transition protection chamber reduces the airflow exchange inside and outside the combustion furnace 2 to a certain extent.

[0050] After the push-out and push-in actions are completed, the glass cooling and tempering operation is carried out. At this time, the transition chamber frame 9 is pushed back into the combustion furnace 2, and the temporary transition protection chamber is quickly released. This will not affect the glass cooling and tempering operation, and the temporary transition protection chamber does not occupy equipment space and does not require extending the cooling route.

[0051] The upper positioning frame 6 is fixedly installed on the conveyor frame 1, and the lower positioning frame 7 is driven up and down by the lifting platform 11 installed below the conveyor frame 1. Under the driving action of the lifting platform 11, the lower positioning frame 7 is initially in contact with the lower end wall of the conveyor frame 1. When the temporary transition protection chamber is formed, the pair of cooling air grilles 8 set up at the top and bottom just play a certain sealing role for the upper and lower sides of the temporary transition protection chamber, which is conducive to placing the initially removed coated glass in a relatively closed "moving space" filled with inert gas. After the transition chamber frame 9 is pushed in the opposite direction, the temporary transition protection chamber is released, and the lower positioning frame 7 is driven down by the lifting platform 11 to separate it from the lower end wall of the conveyor frame 1. At this time, when the upper and lower convection forced heat dissipation is performed, the cold airflow acts on the upper and lower end surfaces of the coated glass and then quickly spreads to the surroundings.

[0052] For details on the low-temperature differential tempering process for double-layer coated photovoltaic glass, please refer to Examples 1 and 2. Figure 10 This includes the following steps:

[0053] Step 1: Loading and conveying the film into the furnace: High-purity inert nitrogen gas is continuously introduced into the combustion furnace 2 through a pair of atmosphere convection conveying devices 5 to maintain a slightly positive pressure inert atmosphere. The furnace door 3 on one side is opened, and the prepared coated glass is conveyed into the furnace through the conveying rollers 101 on the conveying frame 1.

[0054] Step 2, Atmosphere Protection Heating: After the coated glass is conveyed into the combustion furnace 2, the furnace door 3 is closed. A pair of atmosphere convection conveying devices 5 apply forced convection atmosphere heating to the upper and lower surfaces of the coated glass, rapidly and uniformly heating the coated glass to the set temperature (580-620℃). The PLC control system adjusts the heating time in real time according to the thickness of the coated glass (approximately 40-50 seconds / mm), and ensures that the temperature uniformity at all points in the furnace is within ±2℃.

[0055] Step 3, Synchronous Transfer and Stepped Pre-cooling: When the heating process ends, open the other side furnace door 3. The furnace conveyor roller 101 and the electric linear guide rail 10 start synchronously. The transition chamber frame 9 moves outward synchronously with the coated glass. The outwardly pushed transition chamber frame 9 forms a temporary transition protection chamber with the combustion furnace 2 and the cooling device, maintaining a short-term inert atmosphere protection and carrying out natural radiation and convection heat dissipation. The temperature of the coated glass gradually decreases from the heating temperature to an intermediate temperature.

[0056] Step 4, Forced Cooling Tempering: After a brief pre-cooling, the furnace door 3 is closed again, and the lower cooling air grid 8 is pushed down. The transition chamber frame 9 is pushed back in the opposite direction until it is retracted into the combustion furnace 2. The upper and lower cooling air grids 8 are immediately activated to start low temperature difference tempering cooling. This process uses a multi-segment, programmable frequency conversion cooling system to achieve gentle and uniform cooling, forming a moderate and evenly distributed compressive stress on the glass surface.

[0057] Step 5, conveying the uncoated glass: After tempering and cooling are completed, the coated glass is conveyed to the outside of the cooling device, where it is removed by external automated equipment and stored upright on a special rack.

[0058] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto; any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. A low-temperature differential tempering device for double-layer coated photovoltaic glass, comprising a conveyor frame (1) and multiple horizontally linked conveyor rollers (101) for conveying coated glass, wherein a combustion furnace (2) and a cooling device are horizontally and sequentially installed on the conveyor frame (1), and furnace openings (201) are provided at both ends of the combustion furnace (2), and furnace doors (3) are installed at a pair of furnace openings (201) in a lifting manner, characterized in that: The combustion furnace (2) is equipped with an atmosphere convection conveying device (5) that is connected to its interior and distributed above and below the conveying roller (101) at both the upper and lower ends. The cooling device includes an upper positioning frame (6) and a lower positioning frame (7) distributed on the upper and lower sides of the conveyor frame (1) and installed with one end of each frame connected to the combustion furnace (2). Cooling air grates (8) distributed in the vertical direction of the conveyor roller (101) are embedded on both the upper positioning frame (6) and the lower positioning frame (7). A transition chamber frame (9) embedded in the inner wall of the combustion furnace (2) is also slidably installed on the conveyor frame (1) located on one side of the upper positioning frame (6). After the transition chamber frame (9) moves to the outside of the combustion furnace (2), it forms a temporary transition protection chamber with the upper positioning frame (6), the conveyor frame (1) and the combustion furnace (2). The transition chamber frame (9) is a U-shaped frame structure with an opening on one side of the combustion furnace (2). The inner walls of the front and rear sides of the conveyor frame (1) are open and closed with sliding cavities that are movably installed with the transition chamber frame (9). The front and rear end walls of the transition chamber frame (9) located outside the combustion furnace (2) are fixed with movable plates (901) that are slidably installed with the front and rear end walls of the conveyor frame (1). The upper end of the movable plate (901) penetrates the outer walls of the front and rear edges of the upper positioning frame (6). The upper ends of the outer walls of the front and rear edges of the upper positioning frame (6) are fixed with electric linear guides (10) for driving the movable plate (901) to move horizontally. The upper and lower end walls of the transition chamber frame (9) are movably and sealed with the lower end wall of the upper positioning frame (6) and the upper end wall of the conveyor frame (1), respectively.

2. The low-temperature differential tempering equipment for double-layer coated photovoltaic glass according to claim 1, characterized in that: Both of the furnace openings (201) are set away from the conveyor roller (101), and both furnace doors (3) are driven up and down by the opening and closing push rods (4) installed on the front and rear end walls of the combustion furnace (2).

3. The low-temperature differential tempering equipment for double-layer coated photovoltaic glass according to claim 1, characterized in that: The pair of atmosphere convection conveying devices (5) are connected to an external atmosphere heating device. The combustion furnace (2) has an overflow chamber (202) reserved in each of the four corners. The atmosphere heating device is connected to the overflow chamber (202) through a circulation pipe. The atmosphere heating device consists of an atmosphere heating tank and a circulation fan. The air inlet of the circulation fan is connected to the circulation pipe, and its air outlet is connected to the atmosphere heating tank. The air outlet of the atmosphere heating tank is connected to the pair of atmosphere convection conveying devices (5).

4. The low-temperature differential tempering equipment for double-layer coated photovoltaic glass according to claim 1, characterized in that: The upper positioning frame (6) is fixedly installed on the conveyor frame (1), and the lower positioning frame (7) is driven up and down by the lifting platform (11) installed below the conveyor frame (1). Under the driving action of the lifting platform (11), the lower positioning frame (7) is initially connected to the lower end wall of the conveyor frame (1).

5. A low-temperature differential tempering process for double-layer coated photovoltaic glass, employing the low-temperature differential tempering equipment for double-layer coated photovoltaic glass as described in any one of claims 1-4, characterized in that, Includes the following steps: Step 1: Loading and conveying the film into the furnace: The coated glass is conveyed to the combustion furnace (2) which maintains a slightly positive pressure inert atmosphere by the conveying roller (101), and the furnace door (3) is closed. Step 2, Atmosphere protection heating: Using a pair of atmosphere convection conveying devices (5), forced convection atmosphere heating is applied to the upper and lower surfaces of the coated glass to quickly and uniformly heat the coated glass to the set temperature. The PLC control system adjusts the heating time in real time according to the thickness of the coated glass and ensures that the temperature uniformity of each point in the furnace is within ±2℃. Step 3, Synchronous Transfer and Stepped Pre-cooling: When the heating process ends, open the other side furnace door (3), and the furnace conveyor roller (101) and the electric linear guide rail (10) start synchronously. The transition chamber frame (9) moves outward synchronously with the coated glass. The transition chamber frame (9) pushed outward forms a temporary transition protection chamber with the combustion furnace (2) and the cooling device to maintain a short-term inert atmosphere protection and carry out natural radiation and convection heat dissipation. Step 4, Forced Cooling Tempering: The furnace door (3) is closed again, and the transition chamber frame (9) is reversed until it is retracted into the combustion furnace (2). The upper and lower cooling air grids (8) are immediately activated to begin low-temperature differential tempering cooling. Step 5: Transport the film.

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