Diffusion film coating device with gradient temperature structure

Abstract

The invention discloses a diffusion film coating device with a gradient temperature structure, and relates to the technical field of diffusion film coating. The coating device specifically comprises a main body box, a feeding port and a discharging port are formed in the two sides of the main body box correspondingly, a material guiding mechanism is arranged in the middle of the back face of the main body box, a coating mechanism is arranged above the position, close to the material guiding mechanism, of the main body box, a reciprocating mechanism is arranged on the back face of the material guiding mechanism, and a heating assembly is arranged in the position, close to the material guiding mechanism, of the reciprocating mechanism; transparent base materials are inserted into the feeding port and the discharging port in a sliding mode respectively and wound on the material guiding mechanism, the outer wall of the front face of the main body box is connected with a box door through a hinge, a servo motor is fixed to the outer wall of the back face of the main body box through a supporting plate, and the output end of the servo motor is connected with the driving end of the material guiding mechanism through threads. According to the invention, the fluidity and the drying speed of the coating liquid are improved, and the coating defects are reduced, so that the optical performance and the surface flatness of the diffusion film are improved.

Description

Technical Field

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

[0002] Diffusion films play an important role in modern technology and are widely used in fields such as electronics, optics, construction, and chemical engineering. 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 regulate 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 usually cannot meet the high requirements for film thickness, uniformity, and performance, so new technologies are needed to improve these problems. The gradient temperature coating technology has emerged. By controlling the temperature distribution during the coating process, precise control of the performance of the film material can be achieved, thus meeting the needs of different applications.

[0003] Diffusion films have the function of diffusing light. Diffusion films are generally made by coating a diffusion layer on the surface of a transparent substrate such as PET. The diffusion layer generally includes a resin binder and diffusion agent beads, and light will refract when passing through the diffusion agent beads. When the light emitted by the light source passes through the diffusion film, the light passes through the substrate and the diffusion layer, and can thus pass through media with different refractive indices, so that the light is scattered on the surface of the diffusion film, and the light can be softly and evenly spread.

[0004] After retrieval, the invention with the Chinese patent publication number CN219051931U discloses a diffusion film coating device with an anti-wrinkle function, including a workbench. A support column is fixedly connected to the bottom of the workbench, and a housing and a coating device body are respectively fixedly connected to the top of the workbench. The coating device body is located inside the housing. Guide rollers are movably connected inside the housing and are respectively located on both sides of the coating device body. An installation frame is arranged on the top of the guide roller, a groove is opened on the top of the installation frame, and a permanent magnet is fixedly connected inside the groove. An electromagnet is fixedly connected to the top inside the housing, and the electromagnet is aligned with the permanent magnet. By setting the electromagnet and the permanent magnet, the installation frame and the auxiliary roller are driven to move downward, and the diffusion film is clamped in cooperation with the guide roller. At the same time, the motor drives the guide roller to rotate, so that the diffusion film moves to the right. The following deficiencies exist in the above-mentioned diffusion film coating device with an anti-wrinkle function: Although the above device avoids the diffusion film from wrinkling when the diffusion film coating device coats the diffusion film, making the diffusion film coating device have an anti-wrinkle function, it does not perform reasonable temperature control during the coating process. In this way, problems such as uneven coating on the surface of the substrate will occur. Summary of the Invention

[0005] The object of the present invention is to solve the disadvantages existing in the prior art, and a diffusion film coating device with a gradient temperature structure is proposed.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A diffusion film coating device with a gradient temperature structure includes a main body box. Feeding ports and discharging ports are respectively opened on both sides of the main body box, and a material guiding mechanism is arranged in the middle of the back surface of the main body box. A coating mechanism is arranged above the main body box near the material guiding mechanism. A reciprocating mechanism is arranged on the back surface of the material guiding mechanism, and a heating component is arranged inside the reciprocating mechanism near the material guiding mechanism. Transparent substrates are respectively inserted and slid in the feeding port and the discharging port, and the transparent substrates are wound around the material guiding mechanism.

[0007] Preferably: A box door is connected to the front outer wall of the main body box through a hinge, and a servo motor is fixed to the back outer wall of the main body box 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. Auxiliary rollers with different heights are rotatably connected to the back inner walls on one side of the main body box near the feeding port and the discharging port, and the transparent substrates are wound around the auxiliary rollers.

[0008] Further: The coating mechanism includes a material pump, a material box, a material leveling box, a connecting pipe, a conduit, a support, a material pipe, and a coating head. The material pump and the material box are connected to the top outer wall of the main body box through bolts, and two material leveling boxes are connected to the top inner wall of the main body box through bolts. The two material leveling boxes are communicated with each other through a connecting pipe, and a valve is connected to the middle section of the connecting pipe through a thread.

[0009] Based on the above-mentioned scheme: The input end and the output end of the material pump are respectively connected to the conduits through threads, and one ends of the two conduits are respectively connected to one side of the material box and one side of one of the material leveling boxes. Supports are respectively fixedly connected to both sides of the bottoms of the two material leveling boxes, and the material pipe is connected to the middle of the bottom of the material leveling box through a thread. The coating head is connected to the bottom end of the support through a bolt, and the inner cavity of the coating head is connected to the bottom end of the material pipe through a thread.

[0010] In a better scheme of the above-mentioned scheme: The material guiding mechanism includes a triangular fixing frame, a guiding roller, and a cover plate. Three guiding rollers are respectively rotatably connected to the middle inner wall of the back surface of the main body box. The triangular fixing frame is sleeved on both ends of the three guiding rollers, and the cover plate is connected to the top of the triangular fixing frame through bolts. The tail end of one of the guiding rollers is connected to the output end of the servo motor through a thread.

[0011] As a further scheme of the present invention: The reciprocating mechanism includes a transmission belt, a swing rod, a guide post, a turntable, a fixed shaft, a displacement sensor, a moving plate, a fixing plate, a rack plate, and a sector gear. The turntable is rotatably connected to the back outer wall of the triangular fixing frame, and the end of the guiding roller connected to the output end of the servo motor forms a transmission cooperation with the end of the turntable through a transmission belt.

[0012] Meanwhile, the swing rod is rotationally connected to the outer wall of the back of the triangular fixing bracket above the turntable through a fixed shaft, and the sector gear is fixedly connected to the top end of the swing rod. A sliding hole is formed on the front surface of the swing rod. The guide post is threadedly connected to the circumferential side of the turntable, and the guide post forms a sliding fit with the sliding hole. Two fixing plates are welded to the outer walls of both sides of the triangular fixing bracket near the upper part of the sector gear.

[0013] As a preferred embodiment of the present invention: there is a guide hole on the outer wall of the triangular fixing bracket between the two fixing plates. The moving plate is slidably connected to the guide hole, and the rack plate is slidably connected to the ends of the two fixing plates. The rack plate meshes with the sector gear. The displacement sensor is bolted to one side of the top of the moving plate. The moving plate is fixedly connected to the sector gear. One end of the moving plate close to the inner side of the triangular fixing bracket is fixedly connected to the heating component.

[0014] Meanwhile, the heating component includes a temperature sensor, a heating rod, a circuit board and a support block. Four support blocks are welded to the inner walls of both sides of the top of the triangular fixing bracket. The support block is connected to the cover plate by bolts.

[0015] As a more optimal solution of the present invention: the heating rod is bolted to both sides of the moving plate, and the circuit board is bolted to the top of the moving plate. The temperature sensor is fixedly connected to the inner wall of the triangular fixing bracket close to the transparent substrate.

[0016] The beneficial effects of the present invention are as follows: 1. The diffusion film coating device with a gradient temperature structure can improve the fluidity and drying speed of the coating liquid, reduce coating defects, improve the optical properties and surface flatness of the diffusion film, accelerate the drying and curing process of the coating liquid, shorten the production cycle, improve production efficiency, and help to improve the edge effect of coating, make the edge of the coating film neater, and reduce the problem of inconsistent edge thickness through the cooperation of the reciprocating machine and the heating component.

[0017] 2. The diffusion film coating device with a gradient temperature structure can ensure the smooth and uniform movement of the transparent substrate and the uniformity of coating on the transparent substrate by starting the servo motor to drive one of the guide rollers to rotate, enabling the transparent substrate to enter the interior of the main body box through the feed port, enter the triangular fixing bracket along the auxiliary rollers with different heights, be wound by the three guide rollers in the triangular fixing bracket, be guided by the auxiliary roller on one side of the discharge port, and be discharged out of the main body box through the discharge port.

[0018] 3. The diffusion film coating device with a gradient temperature structure quantifies the relationship between distance, temperature, and coating effect, and uses sensors to provide real-time feedback data to precisely control the temperature of the heating rod and the position of the moving plate, achieving precise control of the coating process. By optimizing parameters, the coating uniformity can be improved, the edge effect can be alleviated, coating defects can be effectively reduced, the optical performance and surface flatness of the diffusion film can be significantly enhanced, and the product quality can be improved. At the same time, it can accelerate the drying and curing speed of the coating solution, shorten the production cycle, reduce the defective rate, and improve production efficiency. In addition, the algorithm has strong adaptability, can adjust coefficients according to different coating solutions and process conditions, and is also easy to integrate and expand to consider more influencing factors. Moreover, an algorithm is established based on experimental data to support data-driven decision-making, which is convenient for continuous optimization and improvement to ensure the stable and efficient coating process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 FIG. 6 is a front view structural schematic diagram of a diffusion film coating device with a gradient temperature structure proposed by the present invention; Figure 2 FIG. 7 is a side view structural schematic diagram of a diffusion film coating device with a gradient temperature structure proposed by the present invention; Figure 3 FIG. 8 is an internal structural schematic diagram of a diffusion film coating device with a gradient temperature structure proposed by the present invention; Figure 4 FIG. 9 is a structural schematic diagram of a coating head in a diffusion film coating device with a gradient temperature structure proposed by the present invention; Figure 5 FIG. 10 is a front view structural schematic diagram of a material guiding mechanism in a diffusion film coating device with a gradient temperature structure proposed by the present invention; Figure 6 FIG. 11 is a rear view structural schematic diagram of a material guiding mechanism in a diffusion film coating device with a gradient temperature structure proposed by the present invention; Figure 7 is Figure 6 an enlarged view of part A in FIG. Figure 8 FIG. 12 is an internal structural schematic diagram of a triangular fixing bracket in a diffusion film coating device with a gradient temperature structure proposed by the present invention.

[0020] In the figure: 1, feed inlet; 2, main body box; 3, box door; 4, material pump; 5, material box; 6, discharge outlet; 7, servo motor; 8, transparent substrate; 9, material guiding mechanism; 10, auxiliary roller; 11, material leveling 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, swing rod; 1703, guide post; 1704, turntable; 1705, fixed shaft; 1706, displacement sensor; 1707, moving plate; 1708, fixed plate; 1709, rack plate; 1710, sector gear; 1711, temperature sensor; 1712, heating rod; 1713, circuit board; 1714, support block. Detailed implementation manners

[0021] The technical solution of the present invention will be further described in detail below in conjunction with the specific implementation manners.

[0022] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0023] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 should not be construed as a limitation of the present invention.

[0024] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "setting" should be understood in a broad sense. For example, it can be fixedly connected and set, or detachably connected and set, or integrally connected and set. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0025] Embodiment 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 8As shown in the figure, it includes a main body box 2. Feeding ports 1 and discharging ports 6 are respectively opened on both sides of the main body box 2. And a material guiding mechanism 9 is arranged in the middle of the back surface of the main body box 2. A coating mechanism is arranged above the main body box 2 near the material guiding mechanism 9. A reciprocating mechanism 17 is arranged on the back surface of the material guiding mechanism 9. And a heating component is arranged inside the reciprocating mechanism 17 near the material guiding mechanism 9. Transparent substrates 8 are respectively inserted and slid in the feeding port 1 and the discharging port 6. And the transparent substrates 8 are wound around the material guiding mechanism 9. A box door 3 is connected to the front outer wall of the main body box 2 through a hinge. And a servo motor 7 is fixed to the back outer wall of the main body box 2 through a support plate. The output end of the servo motor 7 is connected to the driving end of the material guiding mechanism 9 through a thread. Auxiliary rollers 10 with different heights are rotatably connected to the back inner wall of the main body box 2 on one side near the feeding port 1 and the discharging port 6. And the transparent substrates 8 are wound around the auxiliary rollers 10. The model of the servo motor 7 is Yaskawa SGMGH-20ADA.

[0026] The coating mechanism includes a material pump 4, a material tank 5, a material leveling box 11, a connecting pipe 12, a conduit 13, a support 14, a material pipe 15 and a coating head 16. And the material pump 4 and the material tank 5 are connected to the top outer wall of the main body box 2 through bolts. And two material leveling boxes 11 are connected to the top inner wall of the main body box 2 through bolts. The two material leveling boxes 11 are communicated with each other through the connecting pipe 12. A valve is connected to the middle section of the connecting pipe 12 through a thread. The input end and the output end of the material pump 4 are respectively connected to the conduit 13 through a thread. And one ends of the two conduits 13 are respectively connected to one side of the material tank 5 and one side of one of the material leveling boxes 11. The supports 14 are respectively fixedly connected to both sides of the bottom of the two material leveling boxes 11. And the material pipe 15 is connected to the middle of the bottom of the material leveling box 11 through a thread. The coating head 16 is connected to the bottom end of the support 14 through a bolt. And the inner cavity of the coating head 16 is connected to the bottom end of the material pipe 15 through a thread. The coating head 16 adopts a slot-type coating head of Graco246260.

[0027] During operation, start the material pump 4 to introduce the coating liquid in the material tank 5 into the material leveling box 11 through the conduit 13. The material leveling box 11 injects the coating liquid into the coating head 16 through the material pipe 15. And the coating head 16 evenly coats the coating liquid on the transparent substrate 8. To ensure the smooth and uniform movement of the transparent substrate 8 and ensure the uniformity of coating; as Figure 5 、 Figure 6 As shown in the figure, 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 respectively rotatably connected to the middle inner wall of the back surface of the main body box 2. The triangular fixing frame 901 is sleeved on both ends of 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 threads. Start the servo motor 7 to drive one of the guide rollers 902 to rotate. The transparent substrate 8 enters the interior of the main body box 2 through the feeding port 1, and enters the triangular fixing frame 901 along the auxiliary rollers 10 with different heights. After being wound by the three guide rollers 902 in the triangular fixing frame 901, it is guided by the auxiliary roller 10 on one side of the discharging port 6 and discharged out of the main body box 2 through the discharging port 6. Thus, it is ensured that the transparent substrate 8 moves smoothly and evenly, and the uniformity of the coating of the transparent substrate 8 is ensured.

[0028] In order to improve the fluidity and drying speed of the coating liquid and reduce coating defects; as Figure 7 and Figure 8 shown, the reciprocating mechanism 17 includes a transmission belt 1701, a swing rod 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 a sector gear 1710. The turntable 1704 is rotatably connected to the outer wall of the back of the triangular fixing frame 901, and 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; The swing rod 1702 is rotatably connected to the outer wall of the back of the triangular fixing frame 901 above the turntable 1704 through the fixed shaft 1705, and the sector gear 1710 is fixedly connected to the top of the swing rod 1702. A sliding hole is provided on the front surface of the swing rod 1702. The guide post 1703 is threadedly connected to the circumferential side of the turntable 1704, and the guide post 1703 forms a sliding fit with the sliding hole. Two fixed plates 1708 are welded to the outer walls on both sides of the triangular fixing frame 901 near the sector gear 1710; There is a guide hole on the outer wall of the triangular fixing frame 901 between the two fixed plates 1708. The moving 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 meshes with the sector gear 1710. The displacement sensor 1706 is connected to the top side of the moving plate 1707 by bolts. The moving plate 1707 is fixedly connected to the sector gear 1710. One end of the moving plate 1707 close to the inner side of the triangular fixing frame 901 is fixedly connected to the heating component, and the model of the displacement sensor 1706 is LVDT-500.

[0029] The heating component 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, and the support block 1714 is connected to the cover plate 903 by bolts; The heating rod 1712 is connected to both sides of the moving plate 1707 by bolts, and the circuit board 1713 is connected to the top of the moving plate 1707 by bolts. The temperature sensor 1711 is fixedly connected to the inner wall of the triangular fixing frame 901 near the transparent substrate 8. The model of the circuit board 1713 is EURA TC100, and the model of the temperature sensor 1711 is PT100.

[0030] During operation, the servo motor 7 drives one of the guide rollers 902 to rotate. The rotating guide roller 902 drives the turntable 1704 to rotate through the transmission belt 1701. The guide post 1703 on one side of the circumference of the turntable 1704 makes a circular motion, and the moving guide post 1703 slides synchronously in the sliding hole of the swing rod 1702, driving the swing rod 1702 to swing left and right around the fixed shaft 1705. At the same time, the sector gear 1710 at the top of the swing rod 1702 drives the rack plate 1709 to make a reciprocating horizontal movement at the ends of the two fixing plates 1708, and the moving plate 1707 connected to the rack plate 1709 also moves synchronously; The moving plate 1707 located inside the triangular fixing frame 901 can control the temperature of the two heating rods 1712 at both ends during the coating process of the transparent substrate 8. During this period, the displacement sensor 1706 can monitor the displacement distance of the moving plate 1707, and the temperature sensor 1711 can monitor the heating temperature, which improves the fluidity and drying speed of the coating liquid, reduces coating defects, thereby improving the optical properties and surface flatness of the diffusion film, accelerating the drying and curing process of the coating liquid, shortening the production cycle, improving production efficiency, and helping to improve the edge effect of coating, making the edge of the coating film neater and reducing the problem of inconsistent edge thickness.

[0031] Example 2: A diffusion film coating device with a gradient temperature structure, as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 shown, there is a relationship between the influence of temperature control on the coating effect and the displacement distance and heating temperature of the moving plate 1707, which is specifically as follows: Variable 1: Coating effect index: a: Coating uniformity U (the value range is 0 - 1, 1 represents completely uniform); b: Drying speed ; c: Edge thickness consistency E (ranging from 0 to 1, where 1 represents perfect consistency) Variable two: Distance variable: The distance d between the moving plate and the transparent substrate; Variable three: The temperature T of the heating rod on the moving plate and the actual temperature acting near the coating liquid monitored at different positions (when approaching and moving away) .

[0032] The coating uniformity is affected by the fluidity of the coating liquid, and the fluidity is related to temperature and distance. Generally speaking, as the temperature increases, the viscosity of the coating liquid decreases, the fluidity increases, which is beneficial to improving the coating uniformity; too close or too far distance may lead to uneven distribution of the coating liquid. The formula is as follows: , where, , , , and are experimental fitting coefficients; The drying speed mainly depends on the temperature and the conditions of solvent volatilization. The distance also affects heat transfer and solvent diffusion. According to the principles of heat conduction and mass transfer, the following relationship can be established: , where , and are experimental fitting coefficients, reflects the influence of temperature on the solvent volatilization rate, reflects the influence of distance on heat transfer and solvent diffusion; The 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: , where, , , , and are experimental fitting coefficients, and are used to describe the periodic influence of distance and temperature on the edge coating effect.

[0033] In summary, the experimental steps are as follows: S1: Conduct coating experiments under different distances and temperatures conditions, and record the coating effect indicators of coating uniformity U, drying speed and edge thickness consistency E; S2: Using the collected data, fit the coefficients in the above formula by the least squares method to obtain a specific function expression; S3: During the actual coating process, the displacement sensor 1706 measures the distance in real time , and the temperature sensor 1711 measures the temperature in real time , calculate the coating effect index according to the function obtained by fitting. Then, according to the preset coating effect target, adjust the temperature T of the heating rod and the position of the moving plate , to achieve real-time control of the coating process.

[0034] Combined with the above formula, the relationship between distance, temperature and coating effect can be accurately quantified. The real-time feedback data of the sensor is used to accurately control the temperature of the heating rod and the position of the moving plate, so as to achieve precise control of the coating process. By optimizing the parameters, the coating uniformity can be improved, the edge effect can be improved, the coating defects can be effectively reduced, the optical performance and surface flatness of the diffusion film can be significantly improved, and the product quality can be enhanced. At the same time, it can accelerate the drying and curing speed of the coating solution, shorten the production cycle, reduce the defective rate, and improve the production efficiency. In addition, the algorithm has strong adaptability, can adjust the coefficients according to different coating solutions and process conditions, and is also easy to integrate and expand to consider more influencing factors. Moreover, the algorithm established based on experimental data supports data-driven decision-making, which is convenient for continuous optimization and improvement to ensure the stable and efficient coating process.

[0035] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope 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, On both sides of the main body box (2), a feed inlet (1) and a discharge outlet (6) are respectively provided. And in the middle of the back surface of the main body box (2), a material guiding mechanism (9) is arranged. Above the main body box (2) near the material guiding mechanism (9), a coating mechanism is provided. On the back surface of the material guiding mechanism (9), a reciprocating mechanism (17) is arranged. And inside the reciprocating mechanism (17) near the material guiding mechanism (9), a heating component is provided. The transparent substrate (8) is respectively inserted and slid in the feed inlet (1) and the discharge outlet (6), and the transparent substrate (8) is wound around the material guiding mechanism (9).

2. The diffusion film coating device with a gradient temperature structure according to claim 1, wherein, On the front outer wall of the main body box (2), a box door (3) is connected by a hinge. And on the back outer wall of the main body box (2), a servo motor (7) is fixed by a support plate. The output end of the servo motor (7) is connected to the driving end of the material guiding mechanism (9) by a thread. On the back inner wall of the main body box (2) on one side near the feed inlet (1) and the discharge outlet (6), auxiliary rollers (10) with different heights are rotatably connected. And the transparent substrate (8) is wound around the auxiliary rollers (10).

3. The diffusion film coating device with a gradient temperature structure according to claim 1, wherein, The coating mechanism includes a material pump (4), a material box (5), a material leveling 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 body box (2) by bolts. And two material leveling boxes (11) are connected to the top inner wall of the main body box (2) by bolts. The two material leveling boxes (11) are communicated with each other through the connecting pipe (12). A valve is connected to the middle section of the connecting pipe (12) by a thread.

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

5. A diffusion film coating device with a gradient temperature structure according to claim 1, characterized in that, 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 respectively rotatably connected to the middle inner wall of the back surface of the main body box (2). The triangular fixing frame (901) is sleeved on both ends of the three guide rollers (902). The cover plate (903) is connected to the top of the triangular fixing frame (901) by a bolt. The tail end of one of the guide rollers (902) is connected to the output end of the servo motor (7) by a thread.

6. The diffusion film coating device with a gradient temperature structure according to claim 1, characterized in that, The reciprocating mechanism (17) includes a transmission belt (1701), a swing rod (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 a sector gear (1710). The turntable (1704) is rotatably connected to the outer wall of the back surface of the triangular fixing bracket (901), and 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 fit through the transmission belt (1701).

7. The diffusion film coating device with a gradient temperature structure according to claim 6, characterized in that, The swing rod (1702) is rotatably connected to the outer wall of the back surface of the triangular fixing bracket (901) above the turntable (1704) through the fixed shaft (1705), and the sector gear (1710) is fixedly connected to the top end of the swing rod (1702). A sliding hole is formed in the front surface of the swing rod (1702). The guide post (1703) is threadedly connected to the circumferential side of the turntable (1704), and the guide post (1703) forms a sliding fit with the sliding hole. Two fixed plates (1708) are welded to the outer walls on both sides of the triangular fixing bracket (901) above the sector gear (1710).

8. A diffusion film coating device with a gradient temperature structure according to claim 6, characterized in that, There are guide holes in the outer wall of the triangular fixing bracket (901) between the two fixed plates (1708). The moving plate (1707) is slidably connected in the guide holes, and the rack plate (1709) is slidably connected to the ends of the two fixed plates (1708), and the rack plate (1709) meshes with the sector gear (1710). The displacement sensor (1706) is bolted to the top side of the moving plate (1707). The moving plate (1707) is fixedly connected to the sector gear (1710). One end of the moving plate (1707) close to the inner side of the triangular fixing bracket (901) is fixedly connected to the heating component.

9. The diffusion film coating device with a gradient temperature structure according to claim 1, characterized in that, The heating component includes a temperature sensor (1711), a heating rod (1712), a circuit board (1713) and a support block (1714). Four support blocks (1714) are welded to the inner walls on both sides of the top of the triangular fixing bracket (901), and the support blocks (1714) are connected to the cover plate (903) by bolts.

10. A diffusion film coating device with a gradient temperature structure according to claim 9, characterized in that, The heating rod (1712) is bolted to both sides of the moving plate (1707), and the circuit board (1713) is bolted to the top of the moving plate (1707). The temperature sensor (1711) is fixedly connected to the inner wall of the triangular fixing bracket (901) close to the transparent substrate (8).

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