Sealed fully automatic photovoltaic glass calendering forming method and apparatus
By using a sealed, fully automated photovoltaic glass rolling and forming method, and employing a control console and detection components to automate glass production, the problems of short equipment life and unstable yield in high-temperature environments have been solved, achieving efficient and stable photovoltaic glass production.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- CHINA TRIUMPH INT ENG CO LTD
- Filing Date
- 2025-10-28
- Publication Date
- 2026-07-09
AI Technical Summary
Existing photovoltaic glass production equipment operates in high-temperature environments, which shortens the lifespan of electronic components, results in low efficiency and high cost of manual operation, and the reliance on experience in the molding process leads to unstable glass yield.
A sealed, fully automated photovoltaic glass rolling forming method is adopted. The drive system and detection components of the rolling equipment are controlled by a control console. A process parameter database is established, and the temperature and thickness of the molten glass are adjusted by utilizing a sealed space and a cooling system to achieve automated production.
It lowers the ambient temperature around the equipment, extends the lifespan of electronic components, improves production efficiency and yield, and reduces debugging costs and labor requirements.
Smart Images
Figure CN2025130437_09072026_PF_FP_ABST
Abstract
Description
A sealed, fully automated photovoltaic glass rolling forming method and equipment Technical Field
[0001] This invention relates to the technical field of glass deep processing, and in particular to a sealed, fully automated photovoltaic glass rolling forming method and equipment. Background Technology
[0002] Calendering equipment and processes are crucial for the formation of solar photovoltaic glass, directly affecting the thickness variations in the longitudinal and transverse directions, surface flatness, and surface patterns of the finished glass. When calendering equipment malfunctions, it severely impacts the connectivity of the glass production line, causing significant losses. Therefore, stable and automated calendering equipment is essential for photovoltaic glass production.
[0003] Currently, with the rapidly increasing demand for large-size photovoltaic cell glass cover plates and backsheets, large-tonnage wide-panel solar thin-plate rolling equipment has emerged. The increasing size and tonnage of the equipment means a further increase in the radiant heat of the glass sheet; the ambient temperature near the equipment can exceed 90°C. Existing rolling equipment is primarily manually operated, resulting in harsh working environments and high construction costs. High temperatures can severely impact the lifespan of various electronic components on the equipment. Furthermore, in the current photovoltaic glass production line, routine operations such as plate drawing, machine changing, and glass surface defect control are all performed manually, leading to slow production response, low efficiency, and high labor costs. Many forming processes rely heavily on worker experience and judgment, resulting in varying glass yields due to inconsistent skill levels among operators using the same forming equipment. Summary of the Invention
[0004] In view of the shortcomings of the prior art described above, the technical problem to be solved by the present invention is to provide a sealed fully automatic photovoltaic glass calendering method and equipment to reduce the working environment temperature, improve control accuracy and production efficiency, and reduce debugging costs.
[0005] This invention proposes a sealed, fully automated photovoltaic glass rolling forming method, comprising:
[0006] S100. Input the initial parameters of the glass to be formed into the console. Control the operation of each drive system of the rolling equipment and generate data through the console. Collect the data through the detection components in each drive system and feed it back to the console to complete the calibration of the rolling equipment.
[0007] S200, The control console controls the heating device in the sealed space to heat to a predetermined temperature, so that multiple heat preservation zones with different temperatures are formed in the sealed space, and the temperature of each heat preservation zone decreases sequentially along the glass conveying direction.
[0008] S300. The molten glass is placed on the rolling equipment, and the rolling conveying system and cooling system are started through the control console. The rolling conveying system transports the molten glass into the sealed space. Under the combined action of each heat preservation zone and the cooling system, the temperature of the molten glass gradually decreases to form a glass ribbon.
[0009] S400: During the process of the glass strip leaving the sealed space and entering the annealing furnace, the thickness parameters and surface defect parameters of the glass strip are acquired in real time by the detection device and fed back to the control console for analysis and processing. If the thickness parameters and surface defect parameters meet the requirements, there is no need to adjust the initial parameters. If the thickness parameters and / or surface defect parameters do not meet the requirements, the initial parameters in S100 are adjusted. The control console performs linkage control on each drive system according to the adjusted initial parameters until the thickness parameters and surface defect parameters meet the predetermined requirements.
[0010] S500. Repeat steps S100 to S400 above to establish a database of process parameters for glass forming of different specifications and store it in the control console. The control console calls the corresponding process parameters for rapid debugging according to the glass forming requirements in order to achieve mass production.
[0011] Preferably, the initial parameters include the elevation positioning parameters of the calendering equipment, the glass forming curve, the initial calendering gap parameters, the glass forming base parameters, and the initial speed parameters of the calendering conveying system.
[0012] Preferably, the sealed space includes a first sealed box and a second sealed box, which are arranged sequentially along the glass conveying direction; the first sealed box is provided with at least one first heating device to form a first heat preservation zone; the second sealed box is provided with multiple second heating devices to form a second heat preservation zone; the temperature of the first heat preservation zone is higher than that of the second heat preservation zone.
[0013] Preferably, the calendering conveying system includes a calendering roll system, a secondary roll system, and a conveying roll system. The calendering roll system, the secondary roll system, and the conveying roll system are arranged sequentially along the glass advancing direction and their rotational speeds decrease sequentially. The secondary roll system is disposed in the first sealed box, and the conveying roll system is disposed in the second sealed box.
[0014] Preferably, the cooling system includes a water cooling system and an air cooling system. The water cooling system is connected to the calendering roll system and the auxiliary roll system, and the air cooling system is disposed in the first sealed box and located at the bottom of the auxiliary roll system.
[0015] Preferably, the air-cooling system is also located inside the second sealed box and at the bottom of the conveyor roller system. The control console controls the air-cooling system and the second heating device to work together to achieve temperature compensation.
[0016] Preferably, the heating device has several heating zones, and each heating zone is heated independently to ensure uniform heating during the formation of the glass ribbon from the molten glass.
[0017] Preferably, the detection device includes a thickness measuring device, which acquires thickness parameters at different locations of the glass strip in real time, feeds the thickness parameters back to the control console to obtain the thickness distribution, analyzes the thickness distribution through the control console and adjusts the initial parameters to make the thickness of each part of the glass strip uniformly distributed.
[0018] The present invention also provides a sealed fully automatic photovoltaic glass rolling forming equipment, including a control console, a traveling system, a rolling mill body, a conveying system, a lateral adjustment system, and a longitudinal adjustment system. The traveling system, the rolling mill body, the conveying system, the lateral adjustment system, and the longitudinal adjustment system are all connected to the control console. Above the traveling system are the rolling mill body for rolling molten glass and the conveying system for conveying glass strips. The lateral adjustment system and the longitudinal adjustment system are located below the rolling mill body. The rolling mill body is drivenly connected to the conveying system. The conveying system is located in a sealed space, and several heating devices are provided in the sealed space to form multiple heat preservation zones with different temperatures. The rolling mill body and the conveying system are both connected to a cooling system, and the temperature of the molten glass gradually decreases as it enters each heat preservation zone.
[0019] As described above, the sealed fully automatic photovoltaic glass rolling forming method and equipment of the present invention have the following technical effects:
[0020] This invention utilizes a rolling and conveying system to transport molten glass into a sealed space after rolling. The molten glass passes through various insulation zones, and under the combined action of these zones and the cooling system, its temperature gradually decreases, forming a glass ribbon of a certain thickness. This method effectively reduces the ambient temperature around the rolling equipment, thereby significantly extending the lifespan of electronic components on the rolling equipment.
[0021] This invention controls the movement of each drive system on the rolling mill via a control console and collects motion data through detection components, feeding it back to the control console. This allows for rapid optimization of initial glass parameters and the establishment of a process parameter database, facilitating quick equipment debugging and calibration. This invention significantly reduces the difficulty and cost of initial glass debugging, effectively improving production efficiency and control precision, and ensuring the production quality of photovoltaic glass. Attached Figure Description
[0022] Figure 1 is a schematic flowchart of a sealed fully automatic photovoltaic glass rolling forming method provided in an embodiment of the present invention.
[0023] Figure 2 is a cross-sectional view of a sealed fully automatic photovoltaic glass calendering and forming equipment provided in an embodiment of the present invention.
[0024] Figure 3 is a front view of a sealed fully automatic photovoltaic glass calendering and molding equipment provided in an embodiment of the present invention.
[0025] Figure 4 is a top view of a sealed fully automatic photovoltaic glass calendering and molding equipment provided in an embodiment of the present invention.
[0026] Explanation of reference numerals in the attached drawings: 100, Walking system; 200, Calendering body; 300, Conveying system; 310, Calendering roll system; 320, Auxiliary roll system; 330, Conveying roll system; 400, Lateral adjustment system; 500, Longitudinal adjustment system; 600, Enclosed space; 610, First sealed box; 611, First insulation zone; 620, Second sealed box; 621, Second insulation zone; 630, First heating device; 640, Second heating device; 700, Cooling system; 710, Water cooling system; 720, Air cooling system; 800, Thickness measuring device. Detailed Implementation
[0027] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.
[0028] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation conditions of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity of description and are not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.
[0029] As shown in Figures 1 to 4, an embodiment of a sealed, fully automated photovoltaic glass rolling forming method includes:
[0030] S100. The initial parameters of the glass to be formed are input into the control console. The control console controls the operation of each drive system on the rolling equipment according to the initial parameters. The operation of each drive system generates data, which is then collected by the detection components within each drive system and fed back to the control console to ensure that the rolling equipment is in the preset state, thereby completing the calibration of the rolling equipment. The initial parameters include the rolling equipment elevation positioning parameters, glass forming curves (i.e., viscosity-temperature curves) for different specifications, initial rolling gap parameters, basic glass forming parameters, and initial speed parameters of the rolling conveyor system. The basic glass forming parameters include glass temperature, glass width, glass thickness, rolling force, glass melt inflow rate, and glass melt inflow temperature. Preferably, this control console is a visual control console. By inputting the above parameters into the visual control console, the operator can monitor the dynamic changes of each parameter in real time during the glass forming process. If one or more parameters exceed the predetermined requirements, the control console can precisely adjust the drive system to ensure that the parameters meet the predetermined requirements.
[0031] S200: The heating device within the sealed space 600 is controlled by the control console to heat to a predetermined temperature, creating multiple heat-insulating zones with different temperatures within the sealed space 600, with the temperature of each zone decreasing sequentially along the glass conveying direction. This sealed space 600 effectively reduces the radiant heat from the glass strip to the working environment, thereby significantly lowering the ambient temperature. The heating device within the sealed space has several heating zones, each capable of independent heating, ensuring uniform heating during the glass strip formation process. This guarantees a consistent lateral temperature difference in the glass strip, resulting in clear and uniform embossed patterns with minimal thickness variation, achieving a stable yield.
[0032] Furthermore, the sealed space 600 includes a first sealed box 610 and a second sealed box 620, which are arranged sequentially along the glass conveying direction, such that the glass strip passes through the first sealed box 610 first and then the second sealed box 620. The first sealed box 610 is equipped with at least one first heating device 630 to form a first heat preservation zone 611. The second sealed box 620 is equipped with multiple second heating devices, correspondingly forming a second heat preservation zone 621. The temperature of the first heat preservation zone 611 is higher than that of the second heat preservation zone 621. Temperature measuring devices are installed in both the first and second heat preservation zones 611 and 621 to detect the temperature of the glass strip located in these zones. These temperature measuring devices are connected to a control console and can monitor the temperature of the glass strip in real time and transmit the temperature data to the control console. If the temperature is higher or lower than a preset temperature, the control console can adjust the first heating device 630 and / or the second heating device 640 to smoothly lower the glass strip into the first and second heat preservation zones 611 and 621 to the preset temperature. Before the calendering process, the first insulation zone 611 and the second insulation zone 621 need to be heated to a predetermined temperature to prepare for subsequent temperature compensation. It should be noted that the sealed space 600 can be, but is not limited to, a separate configuration, or it can be a single unit (i.e., the first sealed box 610 and the second sealed box 620 are connected) to minimize the heat radiated from the glass strip into the working environment, thereby significantly reducing the working environment temperature. On the one hand, this effectively improves the operator's comfort; on the other hand, it effectively extends the service life of electronic components and reduces the cost of replacing electronic components.
[0033] S300: The molten glass is placed on the rolling equipment. The rolling conveying system 300 and the cooling system 700 are started by controlling the control console. The molten glass flows into the lip brick according to the flow rate set by the initial parameters. After initial cooling, the rolling conveying system 300 transports the molten glass into the sealed space 600. Under the combined action of the first heat preservation zone 611, the second heat preservation zone 621 and the cooling system 700, the temperature of the glass strip gradually decreases to the predetermined temperature.
[0034] Furthermore, the calendering and conveying system 300 includes a calendering roll system 310, an auxiliary roll system 320, and a conveying roll system 330. These three systems are arranged sequentially along the glass's forward direction, with their rotational speeds decreasing sequentially. The control console controls the rotational speeds of the calendering roll system 310, the auxiliary roll system 320, and the conveying roll system 330, causing their speeds to decrease proportionally to achieve multi-stage speed differences. This further thins the glass strip and improves the glass surface quality. The auxiliary roll system 320 is located within the first sealed box 610, and the conveying roll system 320 is located within the second sealed box 620, allowing the glass strip to smoothly enter both the first and second sealed boxes sequentially.
[0035] Furthermore, the cooling system 700 includes a water-cooling system 710 and an air-cooling system 720. The water-cooling system 710 is connected to the calendering roll system 310 and the auxiliary roll system 320, while the air-cooling system 720 is located inside the first sealed box 610 and at the bottom of the auxiliary roll system 320. Since the auxiliary roll system 320 is composed of several auxiliary rolls, the water-cooling system 710 connects to each auxiliary roll, enabling the cooling of the glass strip on the auxiliary rolls. The air-cooling system 720 blows air through the gaps between the auxiliary rolls onto the glass strip, thus cooling it. The molten glass at 1050°C is cooled to 850°C by the action of the calendering roll system 310 and the water-cooling system 710. Under the action of the calendering roll system 310, the glass strip enters the first sealed box 610, where the combined action of the first heating device, the water-cooling system 710, and the air-cooling system 720 cools the 850°C glass strip down to 700°C. The glass ribbon enters the second sealed box 620 via the auxiliary roller system 320. The air-cooling system 720 is located inside the second sealed box 620 and at the bottom of the conveyor roller system 330. Under the action of multiple second heating devices 640 and the air-cooling system, temperature compensation is achieved for the glass ribbon, cooling it from 700°C to 600°C. The formed glass ribbon is then fed into the annealing furnace via the conveyor roller system 330 for annealing.
[0036] S400: As the glass ribbon leaves the sealed space 600 and enters the annealing furnace, the thickness and surface defect parameters of the glass ribbon are acquired in real time by a detection device, and the acquired parameters are fed back to the control console for analysis and processing. If the thickness and surface defect parameters measured by the detection device both meet the requirements, no adjustment of the initial parameters is needed, and the process proceeds to the next step. If the thickness and / or surface defect parameters do not meet the preset requirements (i.e., at least one of the thickness or surface parameters does not meet the requirements), the initial parameters in S100 need to be adjusted. This can be achieved by adjusting one or more of the initial rolling gap parameters, glass forming basic parameters, and initial speed parameters of the rolling conveyor system. Specifically, the initial parameters on the control console's visual interface are modified to the adjusted and optimized parameters. The control console performs closed-loop linkage control of each drive system based on the adjusted parameters until the thickness and surface defect parameters of the glass ribbon after forming meet the predetermined requirements.
[0037] Furthermore, the inspection device includes a thickness measuring device 800, which acquires thickness parameters at different locations on the glass strip in real time and feeds these parameters back to the control console to obtain the thickness distribution of the glass strip. The control console analyzes the acquired thickness distribution; if the distribution meets predetermined requirements, no adjustment of the initial parameters is needed; otherwise, the initial parameters need to be adjusted via the control console to ensure a uniform thickness distribution across the formed glass strip. This method ensures rapid optimization of initial parameters during debugging, significantly reducing operator difficulty and improving debugging efficiency. In addition, the inspection device includes a vision inspection device, which acquires surface defect parameters of the glass strip in real time and feeds these parameters back to the control console. Among them, the defects on the board surface include bubbles, stones, scratches, roll marks, and unevenness. The vision inspection device collects images and processes them to generate data that is fed back to the control console. The control console analyzes and processes the data fed back by the vision inspection device. If the defects on the board surface exceed the predetermined requirements, the control console needs to adjust the initial parameters to make the defects on the glass strip meet the predetermined standards. If the defects on the board surface meet the predetermined requirements, the process proceeds to the next step.
[0038] S500: Repeat steps S100-S400 above to establish a database of process parameters for glass forming of different specifications and store it in the control console. When a specific specification of glass needs to be produced, the control console can quickly adjust the corresponding process parameters according to the glass forming requirements, saving a significant amount of adjustment time, manpower, and material costs, thus enabling rapid entry into the mass production stage. During mass production, the vision inspection device monitors and controls the glass strip surface defects in real time, effectively ensuring the stability of the production line and the glass yield.
[0039] As shown in Figures 2 to 4, this invention also provides a sealed, fully automatic photovoltaic glass rolling and forming equipment, including a control console, a traveling system 100, a rolling mill body 200, a conveying system 300, a lateral adjustment system 400, and a longitudinal adjustment system 500. The traveling system 100, rolling mill body 200, conveying system 300, lateral adjustment system 400, and longitudinal adjustment system 500 are all connected to the control console. Above the traveling system 100 are the rolling mill body 200 for rolling molten glass and the conveying system 300 for conveying glass strips. The lateral adjustment system 400 and longitudinal adjustment system 500 are located below the rolling mill body 200. The rolling mill body 200 is drivenly connected to the conveying system 300. The conveying system 300 is located within a sealed space 600, which contains several heating devices to form multiple heat preservation zones with different temperatures. Both the rolling mill body 200 and the conveying system 300 are connected to a cooling system 700. After the molten glass enters each heat preservation zone, its temperature gradually decreases until it reaches a predetermined temperature. The specific implementation methods are detailed above and will not be repeated here.
[0040] In summary, this invention utilizes a rolling and conveying system to transport molten glass into a sealed space after rolling. The molten glass passes through various insulation zones, and under the combined action of these zones and the cooling system, its temperature gradually decreases, forming a glass strip of a certain thickness. This method effectively reduces the ambient temperature around the rolling equipment, thereby significantly extending the lifespan of the electronic components on the equipment. Furthermore, this invention controls the movement of each drive system on the rolling equipment via a control console and collects motion data from detection components, feeding it back to the control console. This allows for rapid optimization of initial glass parameters and the establishment of a process parameter database, facilitating rapid equipment debugging and calibration. This invention significantly reduces the difficulty and cost of initial glass debugging, effectively improving production efficiency and control precision, and ensuring the production quality of photovoltaic glass.
[0041] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.
Claims
1. A sealed, fully automated photovoltaic glass rolling forming method, characterized in that, include: S100. Input the initial parameters of the glass to be formed into the console. Control the operation of each drive system of the rolling equipment and generate data through the console. Collect the data through the detection components in each drive system and feed it back to the console to complete the calibration of the rolling equipment. S200, the control console controls the heating device in the sealed space (600) to heat to a predetermined temperature, so that multiple heat preservation zones with different temperatures are formed in the sealed space (600), and the temperature of each heat preservation zone decreases sequentially along the glass conveying direction. S300. Place the molten glass on the rolling equipment and start the rolling conveying system (300) and cooling system (700) through the control console. The rolling conveying system (300) conveys the molten glass into the sealed space (600). Under the combined action of each heat preservation zone and the cooling system (700), the temperature of the glass strip gradually decreases to the predetermined temperature. S400, during the process of the glass strip leaving the sealed space (600) and entering the annealing furnace, the thickness parameters and surface defect parameters of the glass strip are acquired in real time by the detection device and fed back to the control console for analysis and processing; if the thickness parameters and surface defect parameters meet the requirements, there is no need to adjust the initial parameters; if the thickness parameters and / or surface defect parameters do not meet the requirements, the initial parameters in S100 are adjusted, and the control console performs linkage control on each drive system according to the adjusted initial parameters until the thickness parameters and surface defect parameters meet the predetermined requirements; S500. Repeat steps S100 to S400 above to establish a database of process parameters for glass forming of different specifications and store it in the control console. The control console calls the corresponding process parameters for rapid debugging according to the glass forming requirements in order to achieve mass production.
2. The sealed fully automated photovoltaic glass rolling forming method according to claim 1, characterized in that, The initial parameters include the elevation positioning parameters of the calendering equipment, the glass forming curve, the initial gap parameters of the calendering, the basic parameters of the glass forming, and the initial speed parameters of the calendering conveying system.
3. The sealed fully automated photovoltaic glass rolling forming method according to claim 1 or 2, characterized in that, The sealed space (600) includes a first sealed box (610) and a second sealed box (620), which are arranged sequentially along the glass conveying direction. The first sealed box (610) is provided with at least one first heating device (630) to form a first heat preservation zone (611). The second sealed box (620) is provided with a plurality of second heating devices (640) to form a second heat preservation zone (621). The temperature of the first heat preservation zone (611) is higher than that of the second heat preservation zone (621).
4. The sealed fully automated photovoltaic glass rolling forming method according to claim 3, characterized in that, The calendering conveying system (300) includes a calendering roll system (310), a secondary roll system (320), and a conveying roll system (330). The calendering roll system (310), the secondary roll system (320), and the conveying roll system (330) are arranged sequentially along the glass advancing direction and their rotational speeds decrease sequentially. The secondary roll system (320) is located inside the first sealed box (610), and the conveying roll system (320) is located inside the second sealed box (620).
5. The sealed fully automated photovoltaic glass rolling forming method according to claim 4, characterized in that, The cooling system (700) includes a water cooling system (710) and an air cooling system (720). The water cooling system (710) connects the calendering roll system (310) and the auxiliary roll system (320). The air cooling system (720) is disposed in the first sealed box (610) and located at the bottom of the auxiliary roll system (320).
6. The sealed fully automated photovoltaic glass rolling forming method according to claim 5, characterized in that, The air-cooling system (720) is also located inside the second sealed box (620) and at the bottom of the conveyor roller system (330). The control console controls the air-cooling system (720) and the second heating device (640) to work together to achieve temperature compensation.
7. The sealed fully automated photovoltaic glass rolling forming method according to claim 1, characterized in that, The heating device has several heating zones, and each heating zone is heated independently to ensure uniform heating during the formation of the glass ribbon from the molten glass.
8. The sealed fully automated photovoltaic glass rolling forming method according to claim 1, characterized in that, The detection device includes a thickness measuring device (800), which acquires the thickness parameters of different positions of the glass strip in real time, feeds the thickness parameters back to the control console to obtain the thickness distribution, analyzes the thickness distribution through the control console and adjusts the initial parameters to make the thickness of each part of the glass strip uniformly distributed.
9. The sealed fully automated photovoltaic glass rolling forming method according to claim 1, characterized in that, The detection device includes a vision inspection device, which acquires the surface defect parameters of the glass strip in real time and feeds the surface defect parameters back to the control console.
10. A calendering apparatus for use in the calendering method according to any one of claims 1-9, characterized in that, The system includes a control console, a traveling system (100), a rolling mill body (200), a conveying system (300), a lateral adjustment system (400), and a longitudinal adjustment system (500). The traveling system (100), the rolling mill body (200), the conveying system (300), the lateral adjustment system (400), and the longitudinal adjustment system (500) are all connected to the control console. Above the traveling system (100) are the rolling mill body (200) for rolling molten glass and the conveying system (300) for conveying glass strips. The lateral adjustment system (400) and the longitudinal adjustment system (500) are located below the main body of the rolling mill (200); the main body of the rolling mill (200) is connected to the conveying system (300); the conveying system (300) is located in a closed space (600), and the closed space (600) is equipped with several heating devices to form multiple heat preservation zones with different temperatures. The rolling mill (200) and the conveying system (300) are both connected to a cooling system (700), and the temperature of the molten glass gradually decreases as it enters each heat preservation zone.