Nitrogen blanket drying solidification apparatus

Abstract

This invention discloses a nitrogen-protected drying and curing device, comprising a frame assembly; a conveyor assembly mounted on top of the frame assembly; a light box located above the conveyor assembly, the light box containing a light source for curing; light-blocking and air-inlet assemblies located on both sides of the light box, each having inlet and outlet air ducts; nitrogen delivery assemblies located on both sides of the light box; and a top cover plate covering the conveyor assembly. The space below the top cover plate, the light box, the light-blocking and air-inlet assemblies, and the nitrogen delivery assemblies, and above the conveyor assembly, together form an oxygen-free chamber. The distance from the nitrogen delivery assemblies to the conveyor assembly is shorter than the distance from the light-blocking and air-inlet assemblies to the conveyor assembly. The light-blocking and air-inlet assemblies contain several staggered light-blocking plates, and the tortuous channels formed between the light-blocking plates constitute the inlet and outlet air ducts, which also serve as light path obstructions. This invention isolates oxygen by enclosing the oxygen-free chamber and simultaneously achieves low-oxygen protection, heat dissipation, and light shielding through a tortuous air duct structure.

Description

Technical Field

[0001] This invention relates to the field of photocuring equipment, and more specifically to a nitrogen-protected drying and curing equipment. Background Technology

[0002] Currently, in the field of photocuring or drying curing processes, ultraviolet light sources are commonly used to irradiate coatings, adhesives, and other materials to accelerate their curing. Conventional curing processes are mostly carried out in open or well-ventilated environments, but oxygen in the air can easily participate in the reaction, leading to defects such as poor curing of the coating surface, which affects the product's appearance and performance.

[0003] To improve curing quality, current industry practices mainly involve increasing light intensity or using inert gas protection. The former, simply increasing energy, can easily cause material overheating and deformation, and it fails to fundamentally solve the oxygen-inhibited polymerization problem. While the latter can reduce local oxygen content by injecting inert gas, existing equipment generally suffers from uneven gas distribution, poor sealing, and high gas consumption when handling large-scale continuous production, making it difficult to achieve a stable low-oxygen or near-oxygen-free curing environment at a low cost. Furthermore, the conveying, heat dissipation, and structural stability of related equipment also need optimization. Therefore, it is necessary to design a new type of curing equipment that can balance curing quality, operational stability, and operating costs. Summary of the Invention

[0004] The problem to be solved by the present invention is to provide a nitrogen-protected drying and curing device.

[0005] To solve the above problems, the present invention provides a nitrogen-protected drying and curing device. To achieve the above objectives, the technical solution adopted by the present invention to solve its technical problems is as follows: A nitrogen-protected drying and curing device includes: a frame assembly; a conveyor assembly installed on top of the frame assembly for conveying workpieces; a light box located above the conveyor assembly, the light box containing a light source for curing; a light-blocking and air-inlet assembly located on both sides of the light box, the light-blocking and air-inlet assembly having inlet and outlet air ducts for allowing external air to enter and for dissipating heat generated by the light source inside the light box; a nitrogen delivery assembly located on both sides of the light box, the nitrogen delivery assembly for delivering nitrogen to the area between the light box and the conveyor assembly; and a top cover plate covering the conveyor assembly, the space below the top cover plate, the light box, the light-blocking and air-inlet assembly, and the nitrogen delivery assembly and above the conveyor assembly together forming an oxygen-free chamber; wherein the vertical distance from the nitrogen delivery assembly to the conveyor assembly is shorter than the vertical distance from the light-blocking and air-inlet assembly to the conveyor assembly; the light-blocking and air-inlet assembly contains several staggered light-blocking plates, the tortuous channels formed between the light-blocking plates constituting the inlet and outlet air ducts, which also serve as light path obstructions.

[0006] As a further improvement of the present invention, the light-blocking and air-inlet assembly includes a light-blocking box fixed to the side wall of the light box. The interior of the light-blocking box is formed by a tortuous air inlet and outlet channel through a first light-blocking plate, a second light-blocking plate and a third light-blocking plate arranged in a staggered manner. The top of the light-blocking box is provided with a top air inlet and outlet.

[0007] As a further improvement of the present invention, ventilation holes are provided on the side wall of the light box, and the light-blocking box is connected to the light box through the ventilation holes.

[0008] As a further improvement of the present invention, the nitrogen delivery group includes a housing with an opening facing downward and an air curtain strip fixed inside the housing. The air curtain strip has a hollow structure and multiple air outlets arranged in one or several rows are opened on its side or bottom surface. The air outlets are used to blow the introduced nitrogen out downward or obliquely in the form of an air curtain.

[0009] As a further improvement of the present invention, several air curtain strips in the same nitrogen delivery group are connected end to end, and each air curtain strip is provided with an inner connector at the top. At least one end of the nitrogen delivery group is provided with an outer connector, which is used to connect to an external nitrogen source. The air outlet, inner connector, and outer connector are connected in sequence through the air passage.

[0010] As a further improvement of the present invention, the heights of the first light-blocking plate, the second light-blocking plate, and the third light-blocking plate gradually increase; the end of the first light-blocking plate extends vertically downward, and the ends of the second and third light-blocking plates both extend obliquely downward; the acute angle between the extension direction of the end of the second light-blocking plate and the horizontal plane is smaller than the acute angle between the extension direction of the end of the third light-blocking plate and the horizontal plane; the vertical projections of the first, second, and third light-blocking plates intersect.

[0011] As a further improvement of the present invention, the conveying group includes a conveying net, a driving wheel and a driven roller for driving the conveying net, a plurality of supporting guide wheels for supporting the conveying net are provided below the conveying net, and anti-deviation wheels for preventing the conveying net from deviating are provided on the side of the conveying net.

[0012] As a further improvement of the present invention, inlet and outlet baffles are fixed at both ends of the inlet and outlet of the oxygen-free chamber, and the height of the inlet and outlet baffles in the vertical direction is adjustable.

[0013] As a further improvement of the present invention, there are multiple light boxes, and each light box, together with the light-blocking and air-inlet groups and nitrogen conveying groups on both sides, forms a modular light curing station. Multiple modular light curing stations are arranged side by side in sequence along the conveying direction of the conveying group.

[0014] As a further improvement of the present invention, the lateral width of the nitrogen delivery group is greater than the lateral width of the light-blocking and air-inlet group; when multiple modular light curing stations are arranged side by side, two adjacent modular light curing stations share one nitrogen delivery group.

[0015] The beneficial technical effects of using the nitrogen-protected drying and curing equipment of this application are: The enclosed oxygen-free chamber is formed by the top cover, light box, light-blocking and air-inlet group, nitrogen delivery group and conveyor group. It can stably build an inert gas protection space, effectively isolate the entry of external air, avoid oxygen interference with the photocuring reaction, structurally solve the curing defects caused by oxygen inhibition, and ensure the curing quality of the workpiece.

[0016] Setting the nitrogen delivery group closer to the conveyor group allows nitrogen to act directly on the workpiece area, reducing nitrogen diffusion and waste, improving nitrogen utilization efficiency, and quickly replacing the air in the chamber to efficiently create a low-oxygen to oxygen-free curing environment.

[0017] The light-blocking and air-inlet assembly uses staggered light-blocking plates to form a winding channel, achieving the dual functions of ventilation and heat dissipation as well as light blocking. It can smoothly expel the heat generated by the light source inside the light box, maintaining the stability of the light source's operation, and can also block light leakage. No additional light-blocking components are required, simplifying the equipment structure and improving safety during use.

[0018] The nitrogen-protected drying and curing equipment of this application is suitable for the continuous curing production of materials such as photocurable coatings and adhesives, and is especially suitable for precision coating and bonding curing scenarios that require inert gas protection and avoid oxygen inhibition. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of one embodiment of the present invention; Figure 2 This is a perspective view of one embodiment of the present invention; Figure 3 This is a perspective view of one embodiment of the present invention; Figure 4 This is a perspective view of a rack assembly according to one embodiment of the present invention; Figure 5 This is a perspective view of a transmission group according to one embodiment of the present invention; Figure 6This is a perspective view of a light box, a light-blocking and air-inlet assembly, a nitrogen delivery assembly, and an upper cover plate according to one embodiment of the present invention. Figure 7 This is a perspective view of a light box, a light-blocking and air-inlet assembly, and a nitrogen delivery assembly according to one embodiment of the present invention. Figure 8 This is a perspective view of a light box, a light-blocking and air-inlet assembly, and a nitrogen delivery assembly according to one embodiment of the present invention. Figure 9 This is a perspective view of a light box, a light-blocking and air-inlet assembly, and a nitrogen delivery assembly according to one embodiment of the present invention. Figure 10 This is a top view of a light box, a light-blocking and air-inlet assembly, and a nitrogen delivery assembly according to one embodiment of the present invention. Figure 11 This is a cross-sectional view (AA) of one embodiment of the present invention; Figure 12 This is a perspective view of a light box and a light-blocking and air-inlet assembly according to one embodiment of the present invention; Figure 13 This is a perspective view of a nitrogen delivery assembly according to one embodiment of the present invention; Figure 14 This is a perspective view of a light box, a light-blocking and air-inlet assembly, and a nitrogen delivery assembly according to one embodiment of the present invention.

[0021] 1-Light box; 101-Lampshade; 1011-Ventilation hole; 2-Light-blocking and air-inlet assembly; 201-Light-blocking box; 2011-Top air inlet and outlet; 202-First light-blocking plate; 203-Second light-blocking plate; 204-Third light-blocking plate; 3-Drive wheel; 4-Top cover plate; 5-Inlet and outlet baffles; 6-Passive roller; 7-Conveyor net; 8-Frame assembly; 9-Adjustable horn foot; 10-Fan fixing plate; 1001-Fixed opening; 11-Fixed cross brace; 12-Oxygen-free chamber; 13-Supporting guide wheel; 14-Anti-deviation wheel; 15-Baffle; 16-Nitrogen conveying assembly; 1601-Cover; 1602-Air curtain strip; 16021-Air outlet; 1603-Inner connector; 1604-Outer connector; 17-Exhaust flange; 18-Conveyor motor; 19-Lower protrusion; 20-Gap. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to specific embodiments: To achieve the objectives of this invention, please refer to... Figures 1 to 14 A nitrogen-protected drying and curing device, comprising: such as Figure 1As shown, the frame assembly 8 consists of a conveyor assembly mounted on top of the frame assembly 8 for conveying workpieces, a light box 1 located above the conveyor assembly, and an internal light source for curing, and a light-blocking and air-inlet assembly 2 located on both sides of the light box 1. The light-blocking and air-inlet assembly 2 has air ducts for allowing external air to enter and for dissipating heat generated by the light source inside the light box 1, and its internal structure prevents light leakage. A nitrogen gas delivery assembly 16 located on both sides of the light box 1 delivers nitrogen gas to the area between the light box 1 and the conveyor assembly to create a nitrogen protective atmosphere. An upper cover 4 covers the conveyor assembly, and the upper cover 4, together with the space below the light box 1, the light-blocking and air-inlet assembly 2, and the nitrogen gas delivery assembly 16 and above the conveyor assembly, forms a relatively enclosed oxygen-free chamber 12.

[0023] The vertical distance between the nitrogen delivery group 16 and the conveyor group is closer than the vertical distance between the light-blocking and air-inlet group 2 and the conveyor group. The light-blocking and air-inlet group 2 has several light-blocking plates that are distributed in an interlaced manner. The tortuous channels formed between the light-blocking plates constitute the air inlet and outlet channels, which also serve as light path obstructions.

[0024] To clearly demonstrate the structural principles, Figure 7 It contains multiple light boxes 1, light-blocking and air-inlet groups 2 and their nitrogen delivery groups 16. Figure 8 The middle section only shows a light box 1 and its two sides, the light-blocking air intake group 2 and the nitrogen delivery group 16.

[0025] To clearly demonstrate the internal structural principles, Figure 14 Part of the outer shell is hidden, thus revealing the internal structure of the light box 1, the light-blocking and air-inlet group 2, and the nitrogen delivery group 16.

[0026] The beneficial effects of adopting the above technical solution are as follows: The upper cover plate 4, light box 1, light-blocking and air-inlet group 2, nitrogen delivery group 16, and conveyor group together form an oxygen-free chamber 12, creating a closed, inert gas-protected space. This structurally cuts off the path for external oxygen to enter, overcoming the curing defects caused by oxygen inhibition. Simultaneously, the nitrogen delivery group 16 is positioned closer to the conveyor group than the light-blocking and air-inlet group 2, allowing nitrogen to concentrate on the workpiece surface area, reducing ineffective diffusion, accelerating air replacement within the chamber, and maintaining a stable low-oxygen environment with lower gas consumption. The light-blocking and air-inlet group 2 utilizes staggered light-blocking plates to form a tortuous channel, one path handling the air intake and exhaust for heat dissipation of the light box 1, and the other blocking light leakage, achieving integrated ventilation and light-blocking, eliminating the need for additional light-blocking components.

[0027] like Figure 11As shown, in some other embodiments of the present invention, the light-blocking and air-inlet assembly 2 includes a light-blocking box 201 fixed to the side wall of the light box 1. The interior of the light-blocking box 201 is formed by a tortuous air inlet and outlet channel through a first light-blocking plate 202, a second light-blocking plate 203, and a third light-blocking plate 204 arranged in a staggered manner. A top air inlet and outlet 2011 is provided on the top of the light-blocking box 201.

[0028] The beneficial effects of adopting the above technical solution are as follows: using the light-blocking box 201 as a carrier, the first light-blocking plate 202, the second light-blocking plate 203, and the third light-blocking plate 204 are arranged alternately inside, forcing the airflow to travel along a tortuous path. This ensures that the external air can enter smoothly and the heat of the light box 1 can be effectively discharged, while the multiple turns completely block the straight-line emission of light. The top air inlet and outlet 2011 opened at the top directs the airflow upwards, away from the line of sight of the operator, further reducing the risk of light leakage.

[0029] like Figure 14 As shown, in some other embodiments of the present invention, ventilation holes 1011 are provided on the side wall of the light box 1, and the light-blocking box 201 is connected to the light box 1 through the ventilation holes 1011 to form an air flow path from the air intake channel of the light-blocking box 201, through the interior of the light box 1, to the top air inlet and outlet 2011.

[0030] The beneficial effects of adopting the above technical solution are: the ventilation hole 1011 allows the light-blocking box 201 and the interior of the lamp box 1 to be directly connected through the ventilation hole 1011, establishing a directional heat dissipation path from the light-blocking box 201, through the interior of the lamp box 1, and finally out, allowing the cooling air to fully sweep across the area where the light source is located, promptly removing heat and ensuring the stable operation of the light source for a long time.

[0031] Furthermore, the light box 1 includes a lampshade 101, and ventilation holes 1011 can be formed on the side wall of the lampshade 101. The upper end of the light box 1 is also equipped with an exhaust flange 17, which is connected to an external exhaust device to provide power for the aforementioned airflow path, actively extracting heat from the light box 1 and further enhancing heat dissipation efficiency.

[0032] like Figure 9 , Figure 11 , Figure 13 As shown, in some other embodiments of the present invention, the nitrogen delivery group 16 includes a housing 1601 with an opening facing downward and an air curtain 1602 fixed inside the housing 1601. The air curtain 1602 has a hollow structure and multiple air outlets 16021 arranged in one or several rows are opened on its side or bottom surface for blowing the introduced nitrogen downward or obliquely in the form of an air curtain.

[0033] The beneficial effects of adopting the above technical solution are: one or more uniform nitrogen curtains are formed between the light box 1 and the conveyor group. After the curtains fall, they act directly on the workpiece and the surrounding area, which can not only efficiently displace oxygen, but also form an airflow isolation barrier for the workpiece.

[0034] like Figure 11 , Figure 13 , Figure 14 As shown, in some other embodiments of the present invention, a plurality of air curtain strips 1602 are connected end to end within the same nitrogen delivery group 16. Each air curtain strip 1602 is provided with an inner connector 1603 at its top. At least one end of the nitrogen delivery group 16 is provided with an outer connector 1604, which is used to connect to an external nitrogen source. The air outlet 16021, the inner connector 1603, and the outer connector 1604 are connected in sequence.

[0035] The beneficial effects of adopting the above technical solution are: forming a continuous and unobstructed air path; the splicing structure can flexibly increase or decrease the number of air curtain strips 1602 according to the width of the equipment, making it easy to adapt to different widths, while ensuring the continuity and uniformity of air output from each section of the air curtain strip.

[0036] Furthermore, a flow regulating valve can be configured at the external connector 1604 to precisely adjust the nitrogen input according to process requirements. The shaft end of the air curtain strip 1602 is rotatably assembled. The orientation of the air outlet 16021 of the air curtain strip 1602 can also be designed to be replaceable or adjustable, for example, by rotating the air curtain strip 1602 or replacing the air curtain strip with air outlets 16021 at different angles, the injection direction of the nitrogen air curtain can be changed.

[0037] like Figure 11 As shown, in some embodiments of the present invention, the heights of the first light-blocking plate 202, the second light-blocking plate 203, and the third light-blocking plate 204 gradually increase. The end of the first light-blocking plate 202 extends vertically downward, while the ends of the second light-blocking plate 203 and the third light-blocking plate 204 both extend obliquely downward. The acute angle formed by the extension direction of the end of the second light-blocking plate 203 and the horizontal plane is smaller than the acute angle formed by the extension direction of the end of the third light-blocking plate 204 and the horizontal plane. The vertical projections of the first light-blocking plate 202, the second light-blocking plate 203, and the third light-blocking plate 204 intersect.

[0038] The beneficial effects of adopting the above technical solution are: this design causes light to encounter multiple reflections and blockages at different angles when passing through the tortuous channel, preventing it from escaping along any straight path, thus greatly improving the light-blocking efficiency. At the same time, the oblique extension guides the airflow to smoothly change direction, reducing wind resistance and facilitating the smooth dissipation of heat.

[0039] In some other embodiments of the present invention, the conveying group includes a conveying net 7, a driving wheel 3 and a driven roller 6 for driving the conveying net 7, a plurality of supporting guide wheels 13 for supporting the conveying net 7 are provided below the conveying net 7, and anti-deviation wheels 14 for preventing the conveying net 7 from deviating are provided on the side of the conveying net 7.

[0040] The beneficial effects of adopting the above technical solution are: while ensuring smooth conveying, the structure forms a non-contact support below the conveying net 7, avoiding mechanical wear, and is conducive to the uniform distribution of airflow at the bottom of the oxygen-free chamber 12, indirectly assisting in the stable formation of the air curtain.

[0041] Furthermore, the frame assembly 8 can be formed by welding square tubes, with reinforcing square tubes in both the horizontal and vertical directions to ensure the overall stability of the equipment. A fan mounting plate 10 can be installed on the frame assembly 8, with mounting holes 1001 for installing an exhaust fan to dissipate heat from the electronic power supply components of the equipment. Adjustable horn feet 9 are provided at the bottom of the frame assembly 8; by adjusting the height of each adjusting horn foot 9, the equipment can be made to a predetermined level. The frame assembly 8 also includes fixed cross braces 11 to support the upper structure of the conveyor group, making the conveyor network 7 run more smoothly. The conveyor network 7 is preferably a Teflon woven mesh, which has the advantages of corrosion resistance, long service life, and good insulation. The surfaces of the drive wheel 3 and the driven roller 6 are both coated with an adhesive layer to increase adhesion to the conveyor network 7. The drive wheel 3 can be connected to the conveyor motor 18 via a sprocket and chain; the conveyor motor 18 is preferably a geared motor to provide stable operating power for the conveyor network 7.

[0042] In some other embodiments of the present invention, inlet and outlet baffles 5 are fixed at both ends of the inlet and outlet of the oxygen-free chamber 12. The height of the inlet and outlet baffles 5 in the vertical direction is adjustable to adjust the gap between them and the conveyor group, so as to block the entry of external gas and the exit of internal light.

[0043] The beneficial effects of adopting the above technical solution are: while ensuring the smooth passage of the workpiece, the opening area is narrowed to the maximum extent, effectively blocking the intrusion of external air and the escape of internal light, so that the low oxygen environment in the chamber remains stable during continuous production.

[0044] Furthermore, the oxygen-free chamber 12 is also equipped with baffles 15, which are fixed on both sides above the conveyor net 7 inside the chamber to prevent the workpiece from deviating when passing through, thus further ensuring the stable progress of the curing process.

[0045] Furthermore, such as Figure 6 As shown, the upper cover plate 4 has downward protrusions 19 on both sides, as... Figure 13 As shown, both ends of the nitrogen delivery assembly 16 also have downward protrusions 19, such as... Figure 14As shown, both ends of the light box 1 also have downward protrusions 19. The downward protrusions 19 are used to form the space of the oxygen-free chamber 12, so as to more accurately control the gap 20 between the light box 1 and the conveyor belt 7 or the workpiece.

[0046] In some other embodiments of the present invention, there are multiple light boxes 1, and each light box 1, together with the light-blocking and air-inlet groups 2 and the nitrogen conveying group 16 on both sides, forms a modular light curing station. Multiple modular light curing stations are arranged side by side in sequence along the conveying direction of the conveying group.

[0047] Along the conveying direction, a nitrogen conveying group 16 is arranged on each side of the light box 1, thereby forming two nitrogen curtains on the left and right sides in the area directly below the light box 1 and above the conveyor network 7.

[0048] Furthermore, such as Figure 3 , Figure 6 As shown, several upper cover plates 4 are sequentially sealed and connected, and one side of the upper cover plate 4 can be sealed and connected with the cover 1601 of the nitrogen delivery group 16.

[0049] The advantages of adopting the above technical solution are: the number of modular photocuring stations can be freely increased or decreased to adapt to the irradiation time requirements of different processes. The entire equipment can be flexibly combined, and expansion can be achieved simply by stacking modules to meet different production capacities and curing requirements without redesigning the entire machine.

[0050] In other embodiments of the present invention, the lateral width of the nitrogen delivery group 16 is greater than the lateral width of the light-blocking air inlet group 2. When multiple modular light curing stations are arranged side-by-side, such as... Figure 7 As shown, two adjacent modular light curing stations share a single nitrogen delivery group 16. The number of nitrogen delivery groups 16 is one more than the number of light boxes 1. A gap 20 is formed between two adjacent light-blocking air intake groups 2.

[0051] The beneficial effects of adopting the above technical solution are: adjacent stations share a single nitrogen delivery group 16, ensuring a tight connection between adjacent air curtain sections, eliminating weak points where oxygen infiltration occurs at the boundary of adjacent curing stations, and forming a continuous air curtain isolation zone throughout the entire process. This reduces the number of nitrogen delivery groups required, simplifies the structure, and lowers gas usage costs.

[0052] Furthermore, the light-blocking air intake group 2 shared between two adjacent modular light curing stations can be fixed to the side walls of the two light boxes 1 on both sides and connected through their respective ventilation holes 1011, while providing heat dissipation air ducts for the two light boxes 1. The gap 20 between the two adjacent light-blocking air intake groups 2 provides a buffer space for the installation and gas flow of the nitrogen delivery group 16, which helps to stabilize the formation and diffusion of the nitrogen curtain.

[0053] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A nitrogen-protected drying and curing device, characterized in that, include: rack assembly; The conveyor assembly, installed on top of the frame assembly, is used to transport workpieces; A light box, located above the conveyor group, has a light source inside for curing; A light-blocking and air-inlet assembly is installed on both sides of the light box. The light-blocking and air-inlet assembly has an air inlet and outlet duct for allowing external air to enter and for dissipating heat generated by the light source inside the light box. A nitrogen delivery group is installed on both sides of the light box, and the nitrogen delivery group is used to deliver nitrogen to the area between the light box and the delivery group; The upper cover plate is placed above the conveyor group. The space below the upper cover plate, the light box, the light-blocking and air-inlet group, and the nitrogen conveying group, and above the conveyor group together form an oxygen-free chamber. The vertical distance between the nitrogen delivery group and the conveyor group is closer than the vertical distance between the light-blocking and air-inlet group and the conveyor group. The light-blocking and air-inlet assembly has several light-blocking plates arranged in an alternating pattern. The tortuous channels formed between the light-blocking plates constitute the air inlet and outlet channels, which also serve as light path obstructions.

2. The nitrogen-protected drying and curing equipment according to claim 1, characterized in that: The light-blocking and air-inlet assembly includes a light-blocking box fixed to the side wall of the light box. Inside the light-blocking box, a tortuous air inlet and outlet duct is formed by a first light-blocking plate, a second light-blocking plate, and a third light-blocking plate arranged in a staggered manner. The top of the light-blocking box is provided with a top air inlet and outlet.

3. The nitrogen-protected drying and curing equipment according to claim 2, characterized in that: The light box has ventilation holes on its side wall, and the light-blocking box is connected to the light box through the ventilation holes.

4. The nitrogen-protected drying and curing equipment according to claim 1, characterized in that: The nitrogen delivery unit includes a downward-opening cover and air curtain strips fixed inside the cover. The air curtain strips are hollow structures with multiple air outlets arranged in one or several rows on their sides or bottom surfaces. The air outlets are used to blow the incoming nitrogen out downward or obliquely in the form of an air curtain.

5. The nitrogen-protected drying and curing equipment according to claim 4, characterized in that: Several air curtain strips are connected end to end within the same nitrogen delivery group. Each air curtain strip has an inner connector at its top. At least one end of the nitrogen delivery group is provided with an outer connector for connecting to an external nitrogen source. The air outlet, inner connector, and outer connector are connected in sequence via air passages.

6. The nitrogen-protected drying and curing equipment according to claim 2, characterized in that: The heights of the first light-blocking plate, the second light-blocking plate, and the third light-blocking plate gradually increase in sequence. The end of the first light-blocking plate extends vertically downward, while the ends of the second and third light-blocking plates both extend obliquely downward. The acute angle between the end extension direction of the second light-blocking plate and the horizontal plane is smaller than the acute angle between the end extension direction of the third light-blocking plate and the horizontal plane. The vertical projections of the first light-blocking plate, the second light-blocking plate, and the third light-blocking plate intersect.

7. The nitrogen-protected drying and curing equipment according to claim 1, characterized in that: The conveying group includes a conveyor network, a driving wheel and a driven roller for driving the conveyor network, a number of support guide wheels for supporting the conveyor network are provided below the conveyor network, and anti-deviation wheels for preventing the conveyor network from deviating are provided on the side of the conveyor network.

8. The nitrogen-protected drying and curing equipment according to claim 1, characterized in that: An inlet and outlet baffle is fixed at both ends of the oxygen-free chamber, and the height of the inlet and outlet baffles in the vertical direction is adjustable.

9. The nitrogen-protected drying and curing equipment according to claim 1, characterized in that: There are multiple light boxes, and each light box, together with the light-blocking and air-inlet groups and nitrogen delivery groups on both sides, forms a modular light curing station. Multiple modular light curing stations are arranged side by side in sequence along the conveying direction of the conveying group.

10. The nitrogen-protected drying and curing equipment according to claim 9, characterized in that: The lateral width of the nitrogen delivery group is greater than the lateral width of the light-blocking and air-inlet group; When multiple modular light curing stations are arranged side by side, adjacent modular light curing stations share a nitrogen delivery group.

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