Graphene heat-conducting glass for automobile window and preparation method thereof

Abstract

The application discloses a graphene heat-conducting glass for automobile window, which comprises a nano iron oxide coating coated on the surface of transparent glass; the surface of the nano iron oxide coating is coated with a cubic boron nitride coating with nano twin crystal structure; and the surface of the cubic boron nitride coating is arranged with a graphene circuit layer. The graphene adhesion can be improved by the intermediate medium layer, the service life is prolonged, and the good performance of the graphene is maintained; the nano iron oxide coating has good ultraviolet resistance and heat conduction performance; the cubic boron nitride coating with nano twin crystal structure has good heat conduction performance, insulation performance and high-energy particle radiation resistance; meanwhile, the cubic boron nitride coating with nano twin crystal structure has good protection performance, and covering the nano iron oxide coating can prevent the nano iron oxide coating from being electrically corroded and corroded by possible acid and alkali in the air, thereby prolonging the service life of the nano iron oxide coating.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of graphene glass, in particular to a graphene heat-conducting glass for automobile windows and a preparation method thereof. BACKGROUND

[0002] The graphene glass can not only maintain the good light-transmitting property of glass itself, but also endow the glass with excellent properties of graphene, such as super-high electrical conductivity, thermal conductivity and surface hydrophobicity. Since the graphene has moderate resistance, the heat generated by the graphene when electrified can be used to remove the water mist on the surface of the glass, and the water mist can also be spontaneously inhibited from forming by using the hydrophobic property of the graphene itself in the case of no electrification. Therefore, the graphene glass anti-fog window has both active and passive anti-fog / defogging capabilities, and is widely used in automobile windows.

[0003] The existing graphene glass for automobile windows is usually obtained by directly attaching or growing graphene on the surface of a glass substrate. However, the bonding force between the graphene and the glass is not strong, and the graphene is easy to fall off after long-term outdoor use or friction, thereby losing the performance of the graphene film. Moreover, although the graphene has good light-transmitting property, it basically has no filtering performance and cannot filter harmful light (ultraviolet light) or radiation. Therefore, the present application provides a graphene heat-conducting glass for automobile windows and a preparation method thereof. SUMMARY

[0004] The present application aims to provide a graphene heat-conducting glass for automobile windows and a preparation method thereof, so as to solve the problems of the existing graphene and glass substrate, i.e., the bonding force is not strong and the graphene cannot filter harmful light.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions.

[0006] A graphene heat-conducting glass for automobile windows comprises:

[0007] A nano-iron oxide coating is coated on the surface of the transparent glass;

[0008] The surface of the nano-iron oxide coating is coated with a nano-twin structure cubic boron nitride coating;

[0009] The surface of the cubic boron nitride coating is arranged with a graphene circuit layer.

[0010] Preferably, the surface of the graphene circuit layer is further covered with a transparent plastic protective film.

[0011] As preferred, the above-mentioned transparent glass is provided as a double-layer glass comprising an inner layer glass and an outer layer glass, wherein the nano-iron oxide coating is provided on the inner side of the inner layer glass, and the outer layer glass is provided as a composite heat-conducting glass comprising a microporous glass skeleton, graphene tubes in a directional connection arrangement are formed in the pores of the microporous glass skeleton, and graphene layers are sprayed on the upper and lower surfaces of the microporous glass skeleton, and the graphene layers on the upper and lower surfaces of the microporous glass skeleton are respectively combined with the upper and lower ends of the graphene tubes.

[0012] The application also provides a preparation method of the graphene heat-conducting glass for automobile windows, comprising the following steps:

[0013] S1: coating a nano-iron oxide coating on the transparent glass;

[0014] S2: transferring the transparent glass after step S1 to a drying oven, and quickly drying to complete dryness under the action of clean ion wind blowing and in an environment of 60-95°C;

[0015] S3: after the nano-iron oxide coating after step S2 is cooled to room temperature, coating a nano-twin structure cubic boron nitride coating;

[0016] S4: transferring the transparent glass after step S3 to a slow cooling channel for conveying and cold drying, and placing at room temperature after cold drying until the temperature returns to normal and the surface condensate completely evaporates;

[0017] S5: pasting a bottom film on the surface of the cubic boron nitride coating, reserving the same space as the graphene circuit layer on the bottom film, and then coating a graphene circuit layer on the bottom film;

[0018] S6: tearing off the bottom film after the graphene circuit layer is dried;

[0019] S7: covering a transparent plastic protective film on the surface of the transparent glass with the graphene circuit layer, and completing the preparation of the graphene heat-conducting glass for automobile windows.

[0020] As preferred, after drying in steps S2 and S4, light transmittance detectors are respectively used to detect whether the surface of the transparent glass has coating defects or cracks, and unqualified products are timely detected and removed, and qualified products enter the next step.

[0021] As preferred, in step S1 of coating the nano-iron oxide coating, in step S3 of coating the nano-twin structure cubic boron nitride coating, and in step S5 of coating the graphene circuit layer, multi-center spin coating is used for coating.

[0022] As preferred, the air filtering box is fixedly connected to the top of the drying box in the S2 step, an air filtering screen is arranged on the opening of one side of the air filtering box, an ion fan is communicated and installed on one side of the air filtering box, the air outlet of the ion fan penetrates the top of the drying box and is communicated with the air outlet on the top of the drying box, an infrared heating lamp is installed on the inner top of the drying box, a first conveying belt is arranged in the drying box, the surface of the belt body of the first conveying belt is bonded with a back radiation film, and heat insulation plates are movably installed on the opening top of both ends of the drying box.

[0023] As preferred, a plurality of heat insulation plates are movably installed in the slow cooling channel, the inside of the slow cooling channel is divided into a plurality of different temperature zones, a semiconductor refrigeration sheet, a temperature controller and a temperature sensor are installed on the side of each zone, the signal output end of the temperature sensor is connected with the signal input end of the temperature controller, and the semiconductor refrigeration sheet is controlled by the temperature controller, a second conveying belt is installed in the slow cooling channel, an exhaust box is communicated with the top of the slow cooling channel through a plurality of vertical hard pipes, and an exhaust pump is communicated with the top of the exhaust box.

[0024] As preferred, the bottom of the heat insulation plate is fixedly connected with protruding sliding blocks on both sides, the bottom of the sliding block is provided as a circular arc structure, and an L-shaped pin shaft is fixedly connected to the top of the heat insulation plate, and a pin sleeve is rotatably arranged on the surface of the L-shaped pin shaft.

[0025] As preferred, a group of light transmitters are arranged at both ends of the drying box and both ends of the slow cooling channel, respectively, a sunken transmission roller shaft driven by a driving motor is installed on both sides of the top surface of the light transmitter, a lamp groove is formed in the center of the top surface of the light transmitter, a plurality of parallel and vertically upward illuminating lamp tubes are installed in the lamp groove, a lamp switch for controlling the lamp tubes and a conveying switch for controlling the driving motor of the transmission roller shaft are installed on one side of the light transmitter.

[0026] Compared with the prior art, the application has the following beneficial effects:

[0027] 1. The nano iron oxide coating can be strongly combined on the surface of the transparent glass, the nano twin crystal structure of the cubic boron nitride coating can be well combined on the surface of the nano iron oxide coating, and the graphene can be easily combined on the surface of the cubic boron nitride coating; through the intermediate medium layer, the adhesion of the graphene can be well improved, and when applied to the automobile window glass, the service life can be improved and the good performance of the graphene can be maintained.

[0028] 2. The nano iron oxide coating and the nano twin crystal structure of the cubic boron nitride coating are both transparent materials and have good light transmission performance, and when applied to the automobile window, the field of vision can be ensured.

[0029] 3. In this invention, the nano-iron oxide coating has excellent UV resistance and thermal conductivity; the nano-twinned cubic boron nitride coating has excellent thermal conductivity, insulation (isolating the electricity between the graphene circuit layer and the nano-iron oxide coating), and resistance to high-energy particle radiation; simultaneously, the nano-twinned cubic boron nitride coating has excellent protective properties, covering the nano-iron oxide coating to prevent it from being electro-corroded and corroded by acids and alkalis that may be present in the air, thus improving the service life of the nano-iron oxide coating; at the same time, it does not affect the heat conduction of the graphene circuit layer to the transparent glass; when applied to automotive windows, due to its excellent thermal conductivity, defogging, UV protection, and resistance to high-energy particle radiation, it can effectively protect the driver and passengers inside the vehicle.

[0030] 4. In the preparation of graphene thermally conductive glass for automotive windows, this invention employs a process of hot drying of the nano-iron oxide coating and cold drying of the cubic boron nitride coating in a slow cooling channel. Pre-production hot and cold tests are conducted to verify the adhesion of the coatings to the glass, preventing subsequent products from being unable to withstand hot and cold conditions and identifying defective products. Simultaneously, the hot drying method for the nano-iron oxide coating significantly shortens its drying time and improves efficiency; while the cold drying of the cubic boron nitride coating in the slow cooling channel increases its density, enhancing its protective performance. By pre-selecting products that are not resistant to hot and cold, the remaining qualified products, when applied to automotive windows, ensure that the car maintains good performance in various cold or hot environments, reducing quality problems in hot and cold weather. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of graphene thermally conductive glass for automotive windows according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the external structure of the drying oven according to an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of the heat insulation board according to an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the structure of the light-transmitting device according to an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the external structure of the slow cooling channel according to an embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of the internal structure of the drying oven according to an embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the internal structure of the slow cooling channel according to an embodiment of the present invention.

[0038] In the image: 101, transparent glass; 102, nano-iron oxide coating; 103, cubic boron nitride coating; 104, graphene circuit layer; 105, transparent plastic protective film;

[0039] 2. Drying oven; 201. First conveyor belt; 202. Air filter box; 203. Ionizing fan; 204. Air filter; 205. Anti-radiation membrane; 206. Infrared heating lamp; 207. Air outlet;

[0040] 3. Light transmitter; 301. Lamp trough; 302. Lamp tube; 303. Drive roller; 304. Lamp switch; 305. Conveyor switch;

[0041] 4. Heat insulation plate; 401. Slider; 402. L-shaped pin; 403. Pin sleeve;

[0042] 5. Slow cooling channel; 501. Rigid pipe; 502. Exhaust box; 503. Exhaust pump; 504. Semiconductor cooling chip; 505. Temperature sensor; 506. Temperature controller; 507. Second conveyor belt. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Example 1

[0045] Please see Figure 1 The present invention provides a technical solution:

[0046] A graphene thermally conductive glass for automotive windows, comprising:

[0047] A nano-iron oxide coating 102 is applied to the surface of transparent glass 101;

[0048] The surface of the nano-iron oxide coating 102 is coated with a cubic boron nitride coating 103 with a nano-twin structure;

[0049] A graphene circuit layer 104 is arranged on the surface of the cubic boron nitride coating 103.

[0050] Specifically, in practice, the surface of the graphene circuit layer 104 is also covered with a transparent plastic protective film 105. The transparent plastic protective film 105 serves to further protect the graphene circuit layer 104.

[0051] Example 2

[0052] Unlike Example 1, the transparent glass 101 is configured as a double-layer glass including an inner glass layer and an outer glass layer. The nano-iron oxide coating 102 is disposed on the inner side of the inner glass layer, while the outer glass layer is configured as a composite thermally conductive glass. The composite thermally conductive glass includes a microporous glass skeleton, in which graphene tubes are formed in a directional connection within the pores of the microporous glass skeleton. Graphene layers are sprayed on the upper and lower surfaces of the microporous glass skeleton, and the graphene layers on the upper and lower surfaces of the microporous glass skeleton are respectively bonded to the upper and lower ends of the graphene tubes.

[0053] The above-mentioned composite thermally conductive glass, referring to the preparation method of graphene thermally conductive composite glass and the graphene thermally conductive composite glass in the graphene thermally conductive composite glass disclosed on the National Patent Network (announcement number: CN115368030A), features a double-layer glass design that can take into account the graphene heating performance inside and outside the glass. Conventional automotive glass has single-layer and double-layer designs. Single-layer glass is generally tempered glass, while double-layer glass is generally laminated glass. The double-layer glass design of this invention is to meet the design requirements of laminated glass for car windows. Both layers of glass have graphene heating performance for defogging.

[0054] Example 3

[0055] Please see Figures 2-7 As shown, unlike Example 1, this example provides a method for preparing graphene thermally conductive glass for automotive windows, including the following steps:

[0056] S1: Coating the transparent glass 101 with a nano-iron oxide coating 102;

[0057] S2: Transfer the transparent glass 101 from step S1 to the drying oven 2 and dry it quickly at 60-95℃ under the action of clean ion wind. Ion wind can neutralize charged particles in the air and on the surface of objects, thus removing static electricity, dust, and preventing electrostatic corrosion. Since the glass surface is prone to static electricity, it is easy to cause electrostatic corrosion when in contact with the nano iron oxide coating 102. The blowing of ion wind can reduce dust and electrostatic corrosion, ensuring the quality of the nano iron oxide coating 102 during the drying process.

[0058] S3: After the nano-iron oxide coating 102, which has been dried in S2, is cooled to room temperature, a cubic boron nitride coating 103 with a nano-twin structure is then coated.

[0059] S4: Transfer the transparent glass 101 that has completed step S3 to the slow cooling channel 5 for conveying and cooling. After cooling, place it at room temperature until it returns to normal temperature and the water droplets condensed on the surface have completely evaporated. The slow cooling channel 5 is equipped with multiple temperature steps, from the inlet to the outlet: 10℃, 5℃, 0℃, -5℃, 0℃, 5℃, 10℃. A colder gradient can also be set, but the minimum temperature should not be lower than -20℃. At the outlet, due to the low temperature, condensation will occur on the surface of the transparent glass 101 when it comes into contact with room temperature gas, producing water droplets. The next step can only be carried out after the water droplets have completely evaporated.

[0060] S5: A base film is attached to the surface of the cubic boron nitride coating 103. The base film has a space reserved in the same way as the graphene circuit layer 104. Then the graphene circuit layer 104 is coated on the base film.

[0061] S6: After the graphene circuit layer 104 dries, peel off the bottom film;

[0062] S7: A transparent plastic protective film 105 is covered on the surface of the transparent glass 101 with the graphene circuit layer 104, thus completing the preparation of graphene thermally conductive glass for automotive windows.

[0063] In practice, after drying is completed in steps S2 and S4, a light transmittance tester 3 is required to detect whether there are any coating defects or cracks on the surface of the transparent glass 101. Defective products are promptly removed from the production line, while qualified products proceed to the next step.

[0064] In implementation, such as Figure 4 As shown, a set of light-transmitting elements 3 are respectively installed at both ends of the drying chamber 2 and at both ends of the slow cooling channel 5. Recessed transmission rollers 303 driven by a drive motor are installed on both sides of the top surface of the light-transmitting element 3. A lamp groove 301 is opened in the center of the top surface of the light-transmitting element 3, and multiple parallel, vertically upward-illuminating lamp tubes 302 are installed in the lamp groove 301. A lamp switch 304 for controlling the lamp tubes 302 and a conveyor switch 305 for controlling the drive motor of the transmission rollers 303 are installed on one side of the light-transmitting element 3. By placing the transparent glass 101 on the light-transmitting element 3 and turning on the light for observation, the coating quality can be inspected.

[0065] Example 4

[0066] Unlike Example 3, this example proposes that when coating the nano-iron oxide coating 102 in step S1, coating the cubic boron nitride coating with a nano-twin structure 103 in step S3, and coating the graphene circuit layer 104 in step S5, a multi-center spin coating method is used.

[0067] The multi-center spin coating method refers to the multi-center spin coating mechanism in the national patent publication (announcement number: CN115580950A) on a transparent graphene heating film for defogging automotive windshields and its manufacturing method. This multi-center spin coating method results in a more uniform film formation. Since it is existing technology, it will not be described in detail here.

[0068] Example 5

[0069] Unlike Example 3, this example proposes specific equipment and components that are mainly used in Example 3, including drying oven 2, slow cooling channel 5 and heat insulation plate 4.

[0070] Among them, such as Figure 2 and Figure 6 As shown in the figure, in step S2 of embodiment 3, an air filter box 202 is fixedly connected to the top of the drying box 2. An air filter screen 204 is provided on one side opening of the air filter box 202. An ion fan 203 is connected to one side of the air filter box 202. The air outlet of the ion fan 203 passes through the top of the drying box 2 and is connected to the air outlet 207 at the top inside the drying box 2. An infrared heating lamp 206 is installed at the top inside the drying box 2. A first conveyor belt 201 is provided inside the drying box 2. An anti-radiation film 205 is adhered to the surface of the first conveyor belt 201. Heat insulation plates 4 are movably installed at the top of the openings at both ends of the drying box 2. In use, the transparent glass 101 enters from the first conveyor belt 201 at one end of the drying box 2 and enters the drying box 2 for drying under the conveyor belt 201. The heat insulation plates 4 at both ends can play a heat insulation role.

[0071] In implementation, such as Figure 5 and Figure 7As shown, multiple heat insulation plates 4 are movably installed inside the slow cooling channel 5, dividing the interior of the slow cooling channel 5 into multiple different temperature zones. Each zone has a semiconductor cooling chip 504, a temperature controller 506, and a temperature sensor 505 installed on its side. The signal output terminal of the temperature sensor 505 is connected to the signal input terminal of the temperature controller 506, and the semiconductor cooling chip 504 is controlled by the temperature controller 506. A second conveyor belt 507 is installed inside the slow cooling channel 5. The top of the slow cooling channel 5 is connected to an exhaust box 502 through multiple vertical rigid pipes 501. An exhaust pump 503 is connected to the top of the exhaust box 502. The slow cooling channel 5 has multiple temperature steps inside. During implementation, the temperature gradient should not be set too large to avoid sudden cooling that could cause the glass to shatter. The slow cooling channel 5 has temperatures of 10℃, 5℃, 0℃, -5℃, 0℃, 5℃, and 10℃ from the inlet to the outlet. Each area is separated by a heat insulation plate 4. The exhaust box 502 is used to exhaust humid and relatively hot air by utilizing the principle that cold air sinks and hot air rises. The hot air carries a lot of moisture. Each area has at least two rigid pipes 501 connected to the exhaust box 502.

[0072] It should be noted that, as Figure 3 As shown, protruding sliders 401 are fixedly connected to both sides of the bottom of the heat insulation plate 4, and the bottom of the sliders 401 is set as an arc-shaped structure; an L-shaped pin 402 is fixedly connected to the top of the heat insulation plate 4, and a pin sleeve 403 is rotatably sleeved on the surface of the L-shaped pin 402; in practice, the pin sleeve 403 is fixed to the inner top of the drying oven 2 or the slow cooling channel 5.

[0073] The slider 401 on the heat insulation plate 4 serves to abut against the surface of the transparent glass 101. When the conveyor belt transfers the transparent glass 101, the slider 401 moves and abuts against the edge of the transparent glass 101 (which is rectangular), providing support. On the one hand, the slider 401 only scratches the edge of the transparent glass surface, without damaging the coating on the central surface. On the other hand, the gap between the heat insulation plate 4 and the transparent glass 101 is smaller during movement, resulting in better heat insulation and energy saving. Since the transparent glass 101 needs to be cut and ground before the final product, the scratched parts will be cut off, thus not affecting the final product. This design of the heat insulation plate 4 makes it convenient to use.

[0074] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A graphene thermally conductive glass for automotive windows, characterized by, Comprise: The transparent glass surface is coated with a hot-dried nano-iron oxide coating; The surface of the nano-iron oxide coating is coated with a cold-dried nano-twin structure cubic boron nitride coating; The surface of the cubic boron nitride coating is arranged with a graphene circuit layer.

2. The graphene thermally conductive glass for automobile window according to claim 1, characterized in that: The surface of the graphene circuit layer is further covered with a transparent plastic protective film.

3. The graphene thermally conductive glass for automobile window according to claim 1, characterized in that: The transparent glass is provided as a double-layer glass comprising an inner layer glass and an outer layer glass, wherein the nano-iron oxide coating is arranged on the inner side of the inner layer glass, and the outer layer glass is provided as a composite heat-conducting glass comprising a microporous glass skeleton, graphene tubes arranged in a directional connection arrangement are formed in the pores of the microporous glass skeleton, and a graphene layer is sprayed on the upper and lower surfaces of the microporous glass skeleton, and the graphene layers on the upper and lower surfaces of the microporous glass skeleton are respectively connected to the upper and lower ends of the graphene tubes.

4. A method for preparing graphene thermally conductive glass for automotive windows, characterized by, Comprise the following steps: S1: coating a nano-iron oxide coating on the transparent glass; S2: transferring the transparent glass completed in step S1 to an oven, and quickly drying to complete dryness under the action of clean ion wind blowing at an environment of 60-95℃; S3: after the nano-iron oxide coating completed in S2 is cooled to room temperature, coating a nano-twin structure cubic boron nitride coating; S4: transferring the transparent glass completed in step S3 to a slow cooling channel for conveying and cold drying, and placing at room temperature after cold drying until the surface condensate is completely evaporated; S5: pasting a bottom film on the surface of the cubic boron nitride coating, reserving the same space as the arrangement of the graphene circuit layer on the bottom film, and then coating a graphene circuit layer on the bottom film; S6: after the graphene circuit layer is dried, tearing off the bottom film; S7: covering a transparent plastic protective film on the surface of the transparent glass with the graphene circuit layer, thereby completing the preparation of the graphene heat-conducting glass for automobile windows.

5. The method of claim 4, wherein the method further comprises the step of: After drying in steps S2 and S4, respectively, a light transmittance detector is used to detect whether there is coating failure or cracks on the surface of the transparent glass, and unqualified products are timely detected and removed, and qualified products enter the next step. ​ 6. The method for preparing graphene heat-conducting glass for automobile window according to claim 4, characterized in that: In step S1 of coating the nano-iron oxide coating, in step S3 of coating the nano-twin structure cubic boron nitride coating, and in step S5 of coating the graphene circuit layer, multi-center spin coating is used for coating.

7. The preparation method of graphene heat-conducting glass for automobile window according to claim 4, characterized in that: Wherein, The top of the oven in step S2 is fixedly connected with an air filter box, an air filter screen is arranged on the opening of one side of the air filter box, an ion fan is installed in communication with one side of the air filter box, the air outlet of the ion fan penetrates the top of the oven and communicates with the air outlet on the top of the oven; an infrared heating lamp is installed on the top of the oven; a first conveying belt is arranged in the oven, and a radiation-resistant film is bonded to the surface of the belt body of the first conveying belt; heat insulation plates are movably installed on the top of both ends of the oven.

8. The method for preparing graphene thermally conductive glass for automotive windows according to claim 4, characterized in that: The slow cooling channel is internally provided with a plurality of heat insulation plates, and the interior of the slow cooling channel is divided into a plurality of different temperature zones, the side of each zone is provided with a semiconductor refrigeration sheet, a temperature controller and a temperature sensor, the signal output end of the temperature sensor is connected with the signal input end of the temperature controller, and the semiconductor refrigeration sheet is controlled by the temperature controller; the interior of the slow cooling channel is internally provided with a second conveying belt, the top of the slow cooling channel is communicated with an exhaust tank through a plurality of vertical hard pipes, and the top of the exhaust tank is communicated with an exhaust pump.

9. The method of claim 7 or 8, wherein the method further comprises the step of: The bottom of the heat insulation plate is fixedly connected with protruding sliding blocks on both sides, and the bottom of the sliding block is provided as a circular arc structure; the top of the heat insulation plate is fixedly connected with an L-shaped pin shaft, and the surface of the L-shaped pin shaft is rotatably provided with a pin sleeve. ​ 10. The method of claim 5, wherein the method further comprises the step of: The light transmitters are respectively arranged at both ends of the drying box and both ends of the slow cooling channel, the top surface of the light transmitter is provided with a set of sunken transmission roller shafts driven by driving motors on both sides, a lamp groove is formed in the center of the top surface of the light transmitter, a plurality of parallel and vertically upward illuminating lamp tubes are arranged in the lamp groove, and a lamp switch for controlling the lamp tubes and a conveying switch for controlling the driving motors of the transmission roller shafts are arranged on one side of the light transmitter. ​

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