A diffusion film coating device with a gradient temperature structure

Abstract

The application discloses a kind of diffusion film coating devices with gradient temperature structure, it is related to diffusion film coating technical field;Specifically including main body box, the two sides of main body box are respectively opened inlet and outlet, and the back of main body box is provided with guide mechanism in middle, and main body box is provided with coating mechanism above guide mechanism close, the back of guide mechanism is provided with reciprocating mechanism, and reciprocating mechanism is provided with heating assembly inside close to guide mechanism, inlet and outlet are respectively inserted sliding transparent substrate, and transparent substrate is wound on guide mechanism, the front outer wall of main body box is connected with box door by hinge, and the back outer wall of main body box is fixed with servo motor by support plate, the output end of servo motor is connected with the driving end of guide mechanism by thread.The application has the effect of improving the flowability and drying speed of coating liquid, reducing coating defects, thereby improving the optical performance and surface flatness of diffusion film.

Description

Technical Field

[0001] The present invention relates to the technical field of diffusion film coating, and in particular to a diffusion film coating device with a gradient temperature structure. Background Art

[0002] Diffusion films play an important role in modern science and technology and are widely used in electronics, optics, construction, chemical industry and other fields. They are used to control the transmission of gases and liquids, improve the performance of materials, and enhance the efficiency of equipment. For example, in electronic devices, diffusion films can be used to protect internal components from moisture and contamination; in the optical field, they can adjust the propagation characteristics of light and improve the performance of optical devices. With the development of materials science, coating technology has gradually evolved into an important industrial production process. Traditional coating methods are usually unable to meet the high requirements for film thickness, uniformity and performance, so new technologies are needed to improve these problems. Gradient temperature coating technology came into being. By controlling the temperature distribution during the coating process, the performance of the film material can be precisely controlled to meet the needs of different applications.

[0003] Diffuser films diffuse light. They are typically made by coating a transparent substrate, such as PET, with a diffusion layer. The diffusion layer typically consists of a resin binder and diffuser beads. Light refracts as it passes through the diffuser beads. When light from a light source passes through the diffuser film, it passes through the substrate and the diffusion layer, passing through the medium with a different refractive index. This causes the light to scatter on the film's surface, distributing it softly and evenly.

[0004] After searching, the invention with Chinese patent publication number CN219051931U discloses a diffusion film coating device with anti-wrinkle function, including a workbench, the bottom of the workbench is fixedly connected to a support column, the top of the workbench is respectively fixedly connected to a shell and a coater body, the coater body is located inside the shell, the inside of the shell is movably connected to guide rollers located on both sides of the coater body, a mounting bracket is provided on the top of the guide roller, the top of the mounting bracket is provided with a groove, the inside of the groove is fixedly connected to a permanent magnet, the top of the inside of the shell is fixedly connected to an electromagnet, and the electromagnet is aligned with the permanent magnet. By setting the electromagnet and the permanent magnet, the mounting bracket and the auxiliary roller are driven to move downward, and the guide roller is cooperated to clamp the diffusion film. At the same time, the motor drives the guide roller to rotate, so that the diffusion film moves to the right. The diffusion film coating device with anti-wrinkle function in the above invention has the following shortcomings:

[0005] Although the above device prevents the diffusion film from wrinkling when the diffusion film coating device is coating the diffusion film, so that the diffusion film coating device has an anti-wrinkle function, it does not perform reasonable temperature control during the coating process, which will cause uneven coating on the substrate surface. Summary of the Invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a diffusion film coating device with a gradient temperature structure.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A diffusion film coating device with a gradient temperature structure includes a main box, a feed port and a discharge port are respectively provided on both sides of the main box, and a material guiding mechanism is provided in the middle of the back side of the main box, a coating mechanism is provided above the main box near the material guiding mechanism, a reciprocating mechanism is provided on the back side of the material guiding mechanism, and a heating component is provided inside the reciprocating mechanism near the material guiding mechanism, a transparent substrate is respectively inserted and slid through the feed port and the discharge port, and the transparent substrate is wrapped around the material guiding mechanism.

[0009] Preferably: the front outer wall of the main box is connected to the box door through a hinge, and the back outer wall of the main box is fixed with a servo motor through a support plate, the output end of the servo motor is connected to the driving end of the material guiding mechanism through a thread, and the back inner wall of the main box near the feed port and the discharge port is rotatably connected with auxiliary rollers of different heights, and the transparent substrate and the auxiliary rollers are intertwined with each other.

[0010] Furthermore: the coating mechanism includes a material pump, a material box, a material equalizing box, a connecting pipe, a conduit, a bracket, a material pipe and a coating head, and the material pump and the material box are connected to the top outer wall of the main box by bolts, and the two material equalizing boxes are connected to the top inner wall of the main box by bolts, the two material equalizing boxes are connected by a connecting pipe, and the middle section of the connecting pipe is connected to a valve by a thread.

[0011] On the basis of the above scheme: the input end and output end of the material pump are respectively connected to the conduit through threads, and one end of the two conduits is respectively connected to one side of the material box and one side of one of the material equalizing boxes, the brackets are respectively fixedly connected to the two sides of the bottom of the two material equalizing boxes, and the material pipe is connected to the middle of the bottom of the material equalizing box through threads, the coating head is connected to the bottom end of the bracket through bolts, and the inner cavity of the coating head is connected to the bottom end of the material pipe through threads.

[0012] A better solution among the above solutions is: the material guiding mechanism includes a triangular fixing frame, a guide roller and a cover plate, and the three guide rollers are respectively rotatably connected to the middle inner wall on the back of the main box, the triangular fixing frame is sleeved on both ends of the three guide rollers, and the cover plate is connected to the top of the triangular fixing frame by bolts, and the tail end of one of the guide rollers is connected to the output end of the servo motor by a thread.

[0013] As a further solution of the present invention: the reciprocating mechanism includes a transmission belt, a rocker arm, a guide column, a turntable, a fixed shaft, a displacement sensor, a movable plate, a fixed plate, a rack plate and fan-shaped teeth, and the turntable is rotatably connected to the back outer wall of the triangular fixed frame, and the end of the guide roller connected to the output end of the servo motor and the end of the turntable form a transmission cooperation through the transmission belt.

[0014] At the same time, the rocker arm is rotatably connected to the back outer wall of the triangular fixing frame near the top of the turntable through a fixed shaft, and the sector-shaped teeth are fixedly connected to the top of the rocker arm. A sliding hole is opened on the front of the rocker arm. The guide column is connected to one side of the circumference of the turntable through a thread, and the guide column and the sliding hole form a sliding fit. The two fixing plates are welded to the outer walls on both sides of the triangular fixing frame near the sector-shaped teeth.

[0015] As a preferred embodiment of the present invention: a guide hole is provided on the outer wall of the triangular fixing frame near the two fixed plates, the movable plate is slidably connected to the guide hole, and the rack plate is slidably connected to the ends of the two fixed plates, and the rack plate is engaged with the sector teeth, the displacement sensor is connected to the top side of the movable plate by bolts, the movable plate is fixedly connected to the sector teeth, and one end of the movable plate near the inner side of the triangular fixing frame is fixedly connected to the heating assembly.

[0016] At the same time, the heating assembly includes a temperature sensor, a heating rod, a circuit board and a support block, and the four support blocks are welded to the inner walls on both sides of the top of the triangular fixing frame, and the support blocks are connected to the cover plate by bolts.

[0017] As a better solution of the present invention: the heating rod is connected to both sides of the movable plate by bolts, and the circuit board is connected to the top of the movable plate by bolts, and the temperature sensor is fixedly connected to the inner wall of the triangular fixing frame close to the transparent substrate.

[0018] The beneficial effects of the present invention are:

[0019] 1. This diffusion film coating device with a gradient temperature structure improves the fluidity and drying speed of the coating liquid and reduces coating defects through the cooperation of a reciprocating machine and a heating component, thereby improving the optical properties and surface flatness of the diffusion film, and accelerating the drying and curing process of the coating liquid, shortening the production cycle, and improving production efficiency. It also helps to improve the edge effect of the coating, making the edge of the coating film more neat and reducing the problem of inconsistent edge thickness.

[0020] 2. This diffusion film coating device with a gradient temperature structure drives one of the guide rollers to rotate by starting the servo motor. The transparent substrate enters the main box through the feed port and enters the triangular fixed frame along the auxiliary rollers of different heights. After being wound by the three guide rollers in the triangular fixed frame, it is guided by the auxiliary roller located on the side of the discharge port and discharged out of the main box through the discharge port. In this way, the transparent substrate is ensured to move smoothly and evenly, ensuring the uniformity of the transparent substrate coating.

[0021] 3. This diffusion film coating device with a gradient temperature structure quantifies the relationship between distance, temperature and coating effect, and uses real-time sensor feedback data to accurately control the temperature of the heating rod and the position of the moving plate to achieve precise control of the coating process. By optimizing parameters, the coating uniformity can be improved, the edge effect can be improved, the coating defects can be effectively reduced, the optical properties and surface flatness of the diffusion film can be significantly improved, and the product quality can be improved. At the same time, it can accelerate the drying and curing speed of the coating liquid, shorten the production cycle, reduce the defective rate, and improve production efficiency. In addition, the algorithm is highly adaptable and the coefficients can be adjusted according to different coating liquids and process conditions. It is also easy to integrate and expand to consider more influencing factors. Moreover, the establishment of an algorithm based on experimental data supports data-driven decision-making, facilitates continuous optimization and improvement, and ensures a stable and efficient coating process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the main structure of a diffusion film coating device with a gradient temperature structure proposed by the present invention;

[0023] Figure 2 This is a side view schematic diagram of a diffusion film coating device with a gradient temperature structure proposed by the present invention;

[0024] Figure 3 This is a schematic diagram of the internal structure of a diffusion film coating device with a gradient temperature structure proposed by the present invention;

[0025] Figure 4 This is a schematic structural diagram of a coating head in a diffusion film coating device with a gradient temperature structure proposed by the present invention;

[0026] Figure 5 This is a schematic diagram of the main structure of a material guiding mechanism in a diffusion film coating device with a gradient temperature structure proposed by the present invention;

[0027] Figure 6 This is a schematic diagram of the back structure of a material guiding mechanism in a diffusion film coating device with a gradient temperature structure proposed by the present invention;

[0028] Figure 7 for Figure 6 A magnified view of point A in the figure;

[0029] Figure 8 This is a schematic diagram of the internal structure of a triangular fixing frame in a diffusion film coating device with a gradient temperature structure proposed by the present invention.

[0030] In the figure: 1. feed port; 2. main box; 3. box door; 4. material pump; 5. material box; 6. material outlet; 7. servo motor; 8. transparent substrate; 9. material guiding mechanism; 10. auxiliary roller; 11. material distribution box; 12. connecting pipe; 13. conduit; 14. bracket; 15. material pipe; 16. coating head; 17. reciprocating mechanism; 901. triangular fixing frame; 902. guide roller; 903. cover plate; 1701. transmission belt; 1702. rocker arm; 1703. guide column; 1704. turntable; 1705. fixed shaft; 1706. displacement sensor; 1707. moving plate; 1708. fixed plate; 1709. rack plate; 1710. sector teeth; 1711. temperature sensor; 1712. heating rod; 1713. circuit board; 1714. support block. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be further described in detail below in conjunction with specific implementation methods.

[0032] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0034] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," and "disposed" should be understood in a broad sense. For example, they may refer to fixed connection or disposition, detachable connection or disposition, or integral connection or disposition. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0035] Example 1: A diffusion film coating device with a gradient temperature structure, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 As shown, it includes a main body box 2, with a feed port 1 and a discharge port 6 respectively provided on both sides of the main body box 2, and a material guide mechanism 9 is provided in the middle of the back of the main body box 2, a coating mechanism is provided above the main body box 2 near the material guide mechanism 9, a reciprocating mechanism 17 is provided on the back of the material guide mechanism 9, and a heating component is provided inside the reciprocating mechanism 17 near the material guide mechanism 9, a transparent substrate 8 is inserted and slidably inserted into the feed port 1 and the discharge port 6, and the transparent substrate 8 is wound around the material guide mechanism 9;

[0036] The front outer wall of the main box 2 is connected to the box door 3 through a hinge, and the back outer wall of the main box 2 is fixed with a servo motor 7 through a support plate. The output end of the servo motor 7 is connected to the driving end of the material guide mechanism 9 through a thread. The back inner wall of the main box 2 close to the feed port 1 and the discharge port 6 is rotatably connected with auxiliary rollers 10 of different heights, and the transparent substrate 8 and the auxiliary rollers 10 are intertwined. The model of the servo motor 7 is Yaskawa SGMGH-20ADA.

[0037] The coating mechanism includes a material pump 4, a material box 5, a material distribution box 11, a connecting pipe 12, a conduit 13, a bracket 14, a material pipe 15 and a coating head 16, and the material pump 4 and the material box 5 are connected to the top outer wall of the main box 2 by bolts, and the two material distribution boxes 11 are connected to the top inner wall of the main box 2 by bolts, and the two material distribution boxes 11 are connected by a connecting pipe 12, and the middle section of the connecting pipe 12 is connected to a valve by a thread;

[0038] The input and output ends of the material pump 4 are respectively connected to the conduit 13 through threads, and one end of the two conduits 13 is respectively connected to one side of the material box 5 and one side of one of the material equalizing boxes 11, the bracket 14 is fixedly connected to the two sides of the bottom of the two material equalizing boxes 11, and the material pipe 15 is connected to the middle of the bottom of the material equalizing box 11 through threads, the coating head 16 is connected to the bottom end of the bracket 14 through bolts, and the inner cavity of the coating head 16 is connected to the bottom end of the material pipe 15 through threads, and the coating head 16 adopts the Graco246260 slit coating head.

[0039] When working, the material pump 4 is started to introduce the coating liquid in the material box 5 into the material distribution box 11 through the conduit 13. The material distribution box 11 injects the coating liquid into the coating head 16 through the material pipe 15. The coating head 16 evenly coats the coating liquid on the transparent substrate 8.

[0040] In order to ensure that the transparent substrate 8 moves smoothly and evenly and to ensure the uniformity of the coating; Figure 5 、 Figure 6As shown, the material guiding mechanism 9 includes a triangular fixing frame 901, a guide roller 902 and a cover plate 903, and the three guide rollers 902 are rotatably connected to the middle inner wall of the back of the main box 2;

[0041] The triangular fixing frame 901 is sleeved on both ends of the three guide rollers 902, and the cover plate 903 is connected to the top of the triangular fixing frame 901 by bolts. The tail end of one of the guide rollers 902 is connected to the output end of the servo motor 7 by a thread.

[0042] The servo motor 7 is started to drive one of the guide rollers 902 to rotate, and the transparent substrate 8 enters the main box 2 through the feed port 1 and enters the triangular fixed frame 901 along the auxiliary rollers 10 of different heights. After being wound by the three guide rollers 902 in the triangular fixed frame 901, it is guided by the auxiliary roller 10 located on one side of the discharge port 6 and is led out of the main box 2 through the discharge port 6. In this way, the transparent substrate 8 is ensured to move smoothly and evenly, and the uniformity of the coating of the transparent substrate 8 is ensured.

[0043] In order to improve the fluidity and drying speed of the coating liquid and reduce coating defects; Figure 7 and Figure 8 As shown, the reciprocating mechanism 17 includes a transmission belt 1701, a rocker 1702, a guide post 1703, a turntable 1704, a fixed shaft 1705, a displacement sensor 1706, a movable plate 1707, a fixed plate 1708, a rack plate 1709 and a sector tooth 1710. The turntable 1704 is rotatably connected to the back outer wall of the triangular fixed frame 901. The end of the guide roller 902 connected to the output end of the servo motor 7 and the end of the turntable 1704 form a transmission cooperation through the transmission belt 1701.

[0044] The swing rod 1702 is rotatably connected to the rear outer wall of the triangular fixing frame 901 above the rotating disk 1704 via a fixed shaft 1705, and a sector tooth 1710 is fixedly connected to the top of the swing rod 1702. A sliding hole is formed on the front of the swing rod 1702, and a guide post 1703 is screwed to one side of the circumference of the rotating disk 1704, and the guide post 1703 forms a sliding fit with the sliding hole. Two fixing plates 1708 are welded to the outer walls of the triangular fixing frame 901 on both sides near the sector tooth 1710.

[0045] There is a guide hole on the outer wall of the triangular fixed frame 901 near the two fixed plates 1708, the movable plate 1707 is slidably connected to the guide hole, and the rack plate 1709 is slidably connected to the ends of the two fixed plates 1708, and the rack plate 1709 is engaged with the sector teeth 1710, the displacement sensor 1706 is connected to the top side of the movable plate 1707 by bolts, the movable plate 1707 is fixedly connected to the sector teeth 1710, and one end of the movable plate 1707 near the inner side of the triangular fixed frame 901 is fixedly connected to the heating assembly, and the model of the displacement sensor 1706 is LVDT-500.

[0046] The heating assembly includes a temperature sensor 1711, a heating rod 1712, a circuit board 1713 and a support block 1714. The four support blocks 1714 are welded to the inner walls on both sides of the top of the triangular fixing frame 901. The support blocks 1714 are connected to the cover plate 903 by bolts.

[0047] The heating rod 1712 is connected to both sides of the movable plate 1707 by bolts, and the circuit board 1713 is connected to the top of the movable plate 1707 by bolts. The temperature sensor 1711 is fixedly connected to the inner wall of the triangular fixing frame 901 close to the transparent substrate 8. The model of the circuit board 1713 is EURA TC100, and the model of the temperature sensor 1711 is PT100.

[0048] During operation, the servo motor 7 drives one of the guide rollers 902 to rotate, and the rotating guide roller 902 drives the turntable 1704 to rotate through the transmission belt 1701. The guide post 1703 located on one side of the turntable 1704 performs a circular motion, and the moving guide post 1703 synchronously slides in the sliding hole of the pendulum rod 1702, driving the pendulum rod 1702 to swing left and right around the fixed axis 1705. At the same time, the sector tooth 1710 located at the top of the pendulum rod 1702 drives the rack plate 1709 to perform reciprocating horizontal movement at the ends of the two fixed plates 1708, and the movable plate 1707 connected to the rack plate 1709 also moves synchronously.

[0049] The movable plate 1707 located on the inner side of the triangular fixed frame 901 and the heating rods 1712 at both ends can control the temperature during the coating process of the transparent substrate 8. During this period, the displacement sensor 1706 can monitor the displacement distance of the movable plate 1707, and the temperature sensor 1711 can monitor the heating temperature, which improves the fluidity and drying speed of the coating liquid and reduces coating defects, thereby improving the optical properties and surface flatness of the diffusion film, and speeding up the drying and curing process of the coating liquid, shortening the production cycle, improving production efficiency, and helping to improve the edge effect of the coating, making the edge of the coating film more neat and reducing the problem of inconsistent edge thickness.

[0050] Example 2: A diffusion film coating device with a gradient temperature structure, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 As shown, there is a relationship between the effect of temperature control on the coating effect and the displacement distance of the movable plate 1707 and the heating temperature, which is as follows:

[0051] Variable 1: Coating effect index:

[0052] a: coating uniformity U (value range is 0-1, 1 means completely uniform);

[0053] b: Drying speed ;

[0054] c: Edge thickness consistency E (value range is 0-1, 1 means perfect consistency)

[0055] Variable 2: Distance variable: the distance d between the moving plate and the transparent substrate;

[0056] Variable 3: The temperature T of the heating rod on the moving plate and the actual temperature acting near the coating liquid monitored at different positions (close and far) .

[0057] Coating uniformity is affected by the fluidity of the coating liquid, which in turn is related to temperature and distance. Generally speaking, as temperature increases, the viscosity of the coating liquid decreases and the fluidity increases, which is conducive to improving coating uniformity; too close or too far distance may lead to uneven distribution of the coating liquid. The formula is as follows:

[0058] ,

[0059] in, , , , and is the experimental fitting coefficient;

[0060] The drying speed mainly depends on the temperature and solvent volatilization conditions. The distance also affects the heat transfer and solvent diffusion. According to the principles of heat conduction and mass transfer, the following relationship can be established:

[0061] ,

[0062] in , and is the experimental fitting coefficient, It reflects the effect of temperature on the evaporation rate of the solvent. It reflects the effect of distance on heat transfer and solvent diffusion;

[0063] Edge thickness consistency is related to the fluidity and drying of the coating liquid at the edge. Appropriate temperature and distance can make the coating liquid spread and dry evenly at the edge. The formula is as follows:

[0064] ,

[0065] in, , , , and is the experimental fitting coefficient, and Used to describe the periodic effects of distance and temperature on edge coating.

[0066] In summary, the experimental steps are as follows:

[0067] S1: At different distances and temperature Carry out coating experiment under the conditions and record coating uniformity U and drying speed and coating effect index of edge thickness consistency E;

[0068] S2: Using the collected data, the coefficients in the above formula are fitted by the least squares method to obtain a specific function expression;

[0069] S3: During the actual coating process, the displacement sensor 1706 measures the distance in real time , temperature sensor 1711 measures temperature in real time , calculate the coating effect index according to the fitted function. Then adjust the temperature T of the heating rod and the position of the moving plate according to the preset coating effect target , realizing real-time control of the coating process.

[0070] Combining the above formulas, the relationship between distance, temperature and coating effect can be accurately quantified, and real-time sensor feedback data can be used to precisely control the temperature of the heating rod and the position of the moving plate to achieve precise control of the coating process. By optimizing the parameters, the coating uniformity can be improved, the edge effect can be improved, coating defects can be effectively reduced, the optical properties and surface flatness of the diffusion film can be significantly improved, and product quality can be improved. At the same time, it can accelerate the drying and curing speed of the coating liquid, shorten the production cycle, reduce the defective rate, and improve production efficiency. In addition, the algorithm is highly adaptable and can adjust the coefficients according to different coating liquids and process conditions. It is also easy to integrate and expand to consider more influencing factors. Moreover, the establishment of an algorithm based on experimental data supports data-driven decision-making, facilitates continuous optimization and improvement, and ensures a stable and efficient coating process.

[0071] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A diffusion film coating device with a gradient temperature structure, comprising a main body box (2), characterized in that: A feed port (1) and a discharge port (6) are respectively provided on both sides of the main box (2), and a material guide mechanism (9) is provided in the middle of the back of the main box (2), a coating mechanism is provided above the main box (2) near the material guide mechanism (9), a reciprocating mechanism (17) is provided on the back of the material guide mechanism (9), and a heating component is provided inside the reciprocating mechanism (17) near the material guide mechanism (9), a transparent substrate (8) is respectively inserted and slidably provided through the feed port (1) and the discharge port (6), and the transparent substrate (8) is wound around the material guide mechanism (9); The front outer wall of the main box (2) is connected to a box door (3) via a hinge, and a servo motor (7) is fixed to the back outer wall of the main box (2) via a support plate, the output end of the servo motor (7) is connected to the driving end of the material guide mechanism (9) via a thread, and the back inner wall of the main box (2) near the feed port (1) and the discharge port (6) is rotatably connected to auxiliary rollers (10) of different heights, and the transparent substrate (8) and the auxiliary rollers (10) are intertwined; The material guide mechanism (9) comprises a triangular fixing frame (901), guide rollers (902) and a cover plate (903), wherein the three guide rollers (902) are rotatably connected to the middle inner wall of the back side of the main body box (2), the triangular fixing frame (901) is sleeved on both ends of the three guide rollers (902), and the cover plate (903) is connected to the top of the triangular fixing frame (901) by bolts, and the tail end of one of the guide rollers (902) is connected to the output end of the servo motor (7) by a thread. The reciprocating mechanism (17) comprises a transmission belt (1701), a rocker (1702), a guide post (1703), a turntable (1704), a fixed shaft (1705), a displacement sensor (1706), a moving plate (1707), a fixed plate (1708), a rack plate (1709) and sector teeth (1710), and the turntable (1704) is rotatably connected to the outer wall of the back side of the triangular fixed frame (901) and is in contact with the output end of the servo motor (7). The end of the connected guide roller (902) and the end of the turntable (1704) form a transmission match through a transmission belt (1701), the rocker (1702) is rotatably connected to the outer wall of the back of the triangular fixed frame (901) above the turntable (1704) through a fixed shaft (1705), and the fan-shaped teeth (1710) are fixedly connected to the top of the rocker (1702). A sliding hole is opened on the front of the rocker (1702), and the guide column (1703) is connected to the turntable through a thread. The disc (1704) is on one side of the circumference, and the guide column (1703) forms a sliding fit with the sliding hole. The two fixed plates (1708) are welded to the outer walls of the triangular fixed frame (901) on both sides close to the fan-shaped teeth (1710). The triangular fixed frame (901) has a guide hole on the outer wall between the two fixed plates (1708). The movable plate (1707) is slidably connected to the guide hole, and the rack plate (1709) is slidably connected to the two fixed plates (1708). The end portion of the movable plate (1707) is engaged with the rack plate (1709) and the sector teeth (1710), the displacement sensor (1706) is connected to the top side of the movable plate (1707) by means of bolts, the displacement sensor (1706) can monitor the displacement distance of the movable plate (1707), the movable plate (1707) is fixedly connected to the sector teeth (1710), and one end of the movable plate (1707) close to the inner side of the triangular fixing frame (901) is fixedly connected to the heating component; The heating assembly includes a temperature sensor (1711), a heating rod (1712), a circuit board (1713) and a support block (1714), and the four support blocks (1714) are welded to the inner walls on both sides of the top of the triangular fixing frame (901), the support blocks (1714) and the cover plate (903) are connected by bolts, the heating rod (1712) is connected to both sides of the movable plate (1707) by bolts, and the circuit board (1713) is connected to the top of the movable plate (1707) by bolts, the temperature sensor (1711) is fixedly connected to the inner wall of the triangular fixing frame (901) on the side close to the transparent substrate (8), the temperature sensor (1711) can monitor the heating temperature, and the movable plate (1707) located on the inner side of the triangular fixing frame (901) and the heating rods (1712) at both ends thereof can control the temperature during the coating process of the transparent substrate (8).

2. The diffusion film coating device with a gradient temperature structure according to claim 1, characterized in that: The coating mechanism comprises a material pump (4), a material box (5), a material distribution box (11), a connecting pipe (12), a guide tube (13), a bracket (14), a material pipe (15) and a coating head (16), wherein the material pump (4) and the material box (5) are connected to the top outer wall of the main box (2) by bolts, and the two material distribution boxes (11) are connected to the top inner wall of the main box (2) by bolts, and the two material distribution boxes (11) are connected to each other by a connecting pipe (12), and a valve is connected to the middle section of the connecting pipe (12) by a thread.

3. The diffusion film coating device with a gradient temperature structure according to claim 2, characterized in that: The input end and the output end of the material pump (4) are respectively connected to the conduit (13) through threads, and one end of the two conduits (13) is respectively connected to one side of the material box (5) and one side of one of the material equalizing boxes (11), the bracket (14) is respectively fixedly connected to the two sides of the bottom of the two material equalizing boxes (11), and the material pipe (15) is connected to the middle of the bottom of the material equalizing box (11) through threads, the coating head (16) is connected to the bottom end of the bracket (14) through bolts, and the inner cavity of the coating head (16) is connected to the bottom end of the material pipe (15) through threads.

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